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Replacement of lead based stabilizers with lead free stabilizers-1
2021 / 11 / 11
Lead based stabilizers are being used from the very beginning to stabilize rigid PVC across the world. The decomposition temperature of PVC is much lower than its processing temperature. Thus, the processing of PVC requires heat stabilizers that do not allow HCl molecules to leave the polymer chain and increases the decomposition temperature. Lead based heat stabilizers provide excellent heat and light stability. They also provide good mechanical and electrical properties and display a very wide processing range. They are the best kind of stabilizers in terms of cost to performance ratio. Apart from these benefits, lead based heat stabilizers have a major drawback of toxicity. A small amount of lead leaching can also cause potential health problems in a young infant. The concern of toxicity has brought an initiative to phase out lead from PVC manufacturing. Lead stabilizers are being replaced by non-toxic calcium (Ca) and zinc (Zn) based stabilizers. The PVC market is now diverted towards heavy metal free stabilizers based on a mixture of Ca-Zn soap and other organic and inorganic compounds. Similar to lead stabilizers, these are also available in One Pack Systems in powder, flake and paste forms. Other than being harmless, Ca-Zn stabilizers prov
2021 / 11 / 04
Poly(vinyl chloride (PVC) is one of the most important commercial plastic and its compounds have a great diversity of applications and methods of processing. But, PVC is thermally unstable at processing temperatures. The amount and type of energy input varies considerably among the many different production methods and end-use applications of PVC. In fact, resin degradation starts in the polymerization reactor. It can continue under storage conditions through oxidation, carbonyl formation, etc. even before use. Once PVC gets heated up to 170°, hydrogen and chlorine are eliminated. Decomposition starts and leads to the release of HCl (autocatalytic dehydrochlorination). Unstable molecules (allylic chlorine structure) appear, which in turn, stimulate the next HCl loss. And so on, this is a chain reaction. Thermal Degradation of PVC The factors which promote PVC degradation include: -Mixing cycles (dry blend, banbury, high speed plastisol dispersators) -Processing (calender, extruder, molder) -Fabricating (embossing, thermoforming, laminating) -Scrap re-work -Heat and light energy of outdoor exposure -Heat of a product`s use environment (auto interior, hot air duct) -Gamma ray sterilization Thus, heat stabilizers play a crucial role to improve the resistance of PVC compounds to heat or high temperatures. The goal of heat stabilizers is to safeguard the vinyl product at all stages. To prevent degradation of PVC compounds, heat stabilizers work by: -Neutralizing hydrogen chloride -Replacing weakened carbon-chlorine bonds -Preventing oxidation Nowadays, compounding industry also expects PVC heat stabilizers to fill many specific requirements on top of heat stabilization.
Types of Heat Stabilizers for Vinyl Compounds
2021 / 11 / 04
There are several basic groups of heat and light stabilizers currently offered to the vinyl industry which include: Mixed Metals Organic acid salts (liquid and solid), consisting of any one or a combination of barium, calcium, cadmium (disappearing), and zinc. Typically, C8 to C18 straight chain or branched chain aliphatic carboxylic acids are used. Aromatic (alkyl benzoic) acids once used are no longer in favor due to toxicity concerns. Organotin Compounds The physical and chemical properties of this organotin heat stabilizers solely depend on the nature of the chemical groups linked to the tin atom. organotin mercaptides offer excellent thermal performance and therefore, are employed as the most efficient thermal stabilizers. Organotin stabilizers are well compatible with the other additives used in PVC therefore minimizing processing challenges. organotin mercaptides also offer outstanding color retention in plasticized and rigid PVC processing. Lead Salts and Soaps (Liquid and Solid) Heat Stabilizers based on lead salts and soaps offer exceptional long-term heat stability. These heat stabilizers are considered as one of the most cost-effective form of stabilizers for PVC. PVC compounds when stabilized with lead heat stabilizers show: -Excellent heat and light stability -Exceptional mechanical and electrical properties -Display a wider processing range Apart from these benefits, lead heat stabilizers have some limitations associated with them as well. Lead stabilizers when used in PVC windows lead to their discoloration. Leads offer the best electrical properties mainly due to the insolubility of lead chlorides formed during stabilization. Currently, lead is under pressure for possible replacement by special mixed metal systems, in secondary and decorative wire insulation. However, primary insulation is still best stabilized by lead.
Impact of PVC Ingredients on Heat Stabilizers Selection
2021 / 11 / 04
The best approach in most cases is to check heat stability and color retention of the formulation with and without these additives. It helps to pre-determine the extent of any potential problem. Vinyl ingredients which can have a potential impact on PVC heat stability are discussed below: Vinyl Resins The wide variety of PVC resins is probably the single greatest factor which explains the large stabilizers offering confronting compounders. PVC homopolymer is made by suspension, bulk (or mass), and emulsion polymerization methods. The amount and type of residual components on the resin shipped to users (catalyst residues, suspension agents, emulsifying agents, etc.) can differ a lot. Two vinyl resins made via the same method by two different producers can have a different response to the same stabilizer system. PVC copolymers and PVC with other co-monomers (propylene, cetyl vinyl ether, vinylidene chloride) also have a different response to a given stabilizer system.
How much do You Know The Current ACR processing aid and impact modifier Market?
2021 / 11 / 01
ACR is commonly used in the industry and many people do not understand it. What do you know about the market demand of ACR? ACR material products are essential to our life and work. Due to the wide use of ACR materials, the market demand for ACR products is also growing. As a result, the plastic processing industry is more actively looking for effective methods and filling materials. In order to reduce production cost, improve product process level and improve production efficiency. At present, the commonly used impact modifiers for PVC are acrylic acid (ACR), chlorinated polyethylene (CPE), methyl methacrylate / butadiene / styrene copolymer (MBS), ethylene / vinyl acetate copolymer (EVA), acrylonitrile / butadiene / styrene copolymer (ABS)), among which ACR impact modifier has the best overall performance. It can effectively control the melt fracture, promote the plasticization of PVC and improve the plasticization quality. ACR was first developed by Rhom & Haas in the 1950s as a processing aid and impact modifier for PVC. Because PVC with ACR has the advantages of processability, tensile strength, modulus, high thermal deformation temperature and excellent weather resistance, the consumption of ACR in the world has increased rapidly in recent years. In the United States, the amount of ACR has exceeded MBS, making it the largest impact modifier for PVC resin. In 1991, the United States consumed about 32000 tons, accounting for 34% of the total sales of impact modifiers. By 1996, the consumption of ACR in the United States had reached 47000 tons, with an average annual gro
2021 / 11 / 01
Lubricants play a very important role in the processing of thermoplastic polymers for improving the processing and application properties of products. Then, because the polymer processing process is very complex, which has a lot of influence on the lubrication, such as the polymer structure, processing machinery, molding method, processing conditions, product shape, the interaction between composite components, and so on. At the same time, considering the required performance of the final product, the selection of the lubrication system in the design must start from the whole formula and comprehensively consider various factors. The following are the selection points of lubricants for PVCL processing and molding: (1) Processing machinery calendering focuses on the external lubrication, extrusion, injection molding focuses on the internal lubrication. (2) Compared with homopolymers, copolymers use more external lubricants. (3) The type and dosage of compounding agent 1. Compared with soft products, the amount of lubricant should be increased for hard products
How to identify low-smoke halogen-free flame-retarded wires
2021 / 10 / 30
1. The product name identification method for the identification method of low-smoke halogen-free flame-retardant wires. Wire--Low-smoke halogen-free flame-retardant polyethylene insulated wire and cable; cable--low-smoke halogen-free flame-retardant polyethylene insulated low-smoke halogen-free flame-retardant polyethylene sheathed power cable. Imitations generally have a different name, such as polyethylene insulated low-smoke halogen-free sheathed flame-retardant power cables. 2. The method of identifying the low-smoke halogen-free flame-retardant wire by the method of skin burning. There should be no obvious depressions in the insulation layer with an electric iron. If there is a large depression, the material or process used in the insulation layer is defective. Or use a lighter to grill, under normal circumstances should be not easy to ignite, the insulation of the cable is still relatively complete after a long time of burning, no smoke and irritating odor, while the diameter has increased. If it is easy to ignite, it can be determined that the insulation of the cable is not using a low-smoke, halogen-free material (most likely polyethylene or cross-linked polyethylene). If large smoke is present, the insulation is a halogen-containing material. If the insulating surface is severely detached after a long period of burning and the diameter is not significantly increased, it indicates that the appropriate irradiation crosslinking process has not been performed. 3. Hot water immersion method for identifying low-smoke halogen-free flame-retardant wires. The core or cable is immersed in hot water at 90 ° C. Under normal conditions, the insulation resistance does not drop rapidly and remains above 0.1 MΩ/Km. If the insulation resistance drops rapidly or even lower than 0.009 MΩ/Km, it indicate
Electrical and Electronic Equipment: Types of Flame Retardants Used in EEE Applications
2021 / 10 / 30
Flame retardants are an important component in reducing the devastating impact of fires on people, property and the environment. Their areas of application in electrical and electronic equipment (EEE) vary depending on the materials being used, the function of the product, and the level of fire resistance that must be achieved based on fire safety standards. Flame retardants have unique characteristics, and, as a result, need to be matched appropriately to the materials used. In wires and cables, for example, the flame retardants used must meet fire safety requirements developed specifically for these products because they have the potential for spreading a fire to the electrical socket, and to walls and curtains. The level of flame retardancy required for printed wiring boards used in consumer mobile phones is different than that of wiring boards used in computer servers or in telecommunications or aerospace applications. Higher electrical and mechanical performance demands must be met with flame retardants that can achieve higher flammability and fire resistance standards, without affecting a product`s performance specifications. When it comes to fire safety, one size does not fit all. Specific flame retardants must be selected carefully to meet fire safety standards, electrical and mechanical requirements. The following classes of flame retardants used in EEE include: · Bromine-based
How Flame Retardants Are Used in Transportation
2021 / 10 / 30
A wide variety of plastics, textiles and composite materials are used extensively in the mechanical, structural and decorative parts of today`s transport, including airplanes, trains and cars. These materials are: (i) highly adaptable to new designs; (ii) lighter weight, making them more energy efficient; (iii) less labor intensive; and (iv) more cost effective. Flame retardants are often used to ensure these materials can meet flammability standards. To make materials fire-resistant, flame retardants act to help stop or slow the spread of fire. They can be used alone, or in combination with other flame retardants that act as synergists to enhance fire retardant properties. If a fire does start, flame retardant solutions work in different ways to help stop or minimize its effects. Learn more about how flame retardants work. Different classes of flame retardants work to reduce the threat of fire hazards in different ways, and must be matched to the specific material being used and the performance specifications of the final product. There is no one-size-fits-all solution when essential fire-protection benefits must be balanced with ensuring optimal performance. Today, travel is safer than ever before, regardless of the mode of transportation. Thousands of people take to the highways, railways and air daily, and they do so with the expectation of reaching their destinations safely. Flame retardants play
Stabilisers are essential to PVC
2021 / 10 / 29
Use of stabilisers is essential to prevent the chain reaction of decomposition. They can also increase PVC`s resistance to daylight, weathering and heat ageing and have an important influence on the physical properties and the cost of a formulation. They are invariably supplied in the form of application-specific blends of which the main constituents are metal soaps, metal salts and organometallic compounds. The choice of heat stabiliser depends on a number of factors including the technical requirements of the PVC product, regulatory approval requirements and cost. Heat stabilisers used in a formulation are usually combined with co-stabilisers that are organic materials such as polyols or epoxidised esters. They provide an additive synergistic effect, and, in the case of certain heat stabilisers, an enhancement of overall stabiliser performance. Lead-based systems have been voluntarily phased out and replaced with CA/Zn or CA/organic stabilisers within Europe under the Vinyl 2010/VinylPlus voluntary commitments of the PVC industry. The majority of tin (Sn) stabilisers are used for rigid packaging films, roofing and transparent rigid sheets for construction applications. The major metals contained in stabilisers are barium (Ba), calcium (Ca), zinc (Zn) and tin (Sn). Ba-Zn and Ca-Zn stabilisers are used under the form of metallic salts such as stearates, while Sn stabilisers are used under the form of organic tin (dialkyl tin compounds).
2021 / 10 / 29
Plastics, or synthetic resins, are classified into two broad categories: thermosetting resins and thermoplastic resins. PVC falls into the thermoplastic resins, which also include polyethylene (PE), polystyrene (PS) and polypropylene (PP). These hard plastics can be softened again through heating. On the other hand, thermosetting resins, that include phenolic resin and melamine resin, are thermally hardened and never become soft again.PVC is made of 57% chlorine and 43% carbon (derived predominantly from oil or gas via ethylene). PVC production uses less unrenewable resources - oil or natural gas - than other plastics, and it can therefore be regarded as a resource-saving plastic. In contrast, the production of plastics such as PE, PP, PET and PS is completely dependent on oil or gas.Thermoplastic resins are often supplied in the form of pelletised material (compounds) with additives (antioxidants, etc.) already blended into it. However, PVC resin can also be supplied in powder form, which it often is, as this powder form is resistant to oxidation and degradation, allowing for a long storage period. Various additives and pigments are then added to the powder during the processing stage, producing a blend that is converted into various PVC products.PVC is predominantly known as `Vinyl` in North America, and while in Europe this is sometimes the case, `Vinyl` usually refers to certain specific flexible applications, such as flooring, decorative sheets, musical records and artificial leather.
2021 / 10 / 29
Processing of PVC and plastic manufacturing in general at elevated temperatures requires the use of thermal stabilizers. Therefore, PVC Stabilizer is one of the most necessary additives during the PVC compound/product manufacturing to firstly prevent resin from being bad influenced by high heat, secondly to maintain and improve physical properties of PVC finished products. Most importantly and indispensably, PVC Stabilizer allows stable PVC processing, ensuring its thermal stability. It is used to prevent degradation of plastics by heat, to increase strength, not only in processing as mentioned above, but also in applications. This additive improves the final product`s resistance against light, sun exposure, outdoor weathering and reduces oxidation. Overall, PVC Stabilizer enhances the mechanical properties of the finished products, keeping their durability during using period. Being one of the leading manufacturers of PVC Stabilizer in China, NOVISTA put all our effort into producing standard stabilizers with high quality ingredients. Together with a skilled engineering team and advanced manufacturing process, we are able to provide you One pack lead Stabilizer and Ca/Zn Stabilizer. Both of them are perfect materials for different markets such as pipe & fitting, cable, profile, sheet, -
Flame retardants actually stop the spread of fires
2021 / 10 / 23
To answer that question, let`s use flame retardant furniture as an example. The number of upholstered furniture fires in the home environment dropped by 84 percent from 1980, the first year that data were available, to 2009, according to NFPA. While several factors have contributed to that sharp decline, the timeframe coincides with the use of flame retardants to meet flammability standards imposed in California in 1976. In the absence of a national requirement, the California standards were broadly followed by the US furniture industry over the following 20 years. Similar findings have been reported in the United Kingdom where flammability standards also are in place for furniture. Despite this substantial progress, upholstered furniture remains a significant contributor to home fire deaths, according to NFPA. During the period from 2005 to 2009, while upholstered furniture was the item first ignited in 2 percent of reported home fires, these fires resulted in 19 percent of the home fire deaths. Looking at U.S. home fires that originated with upholstered furniture between 2005 and 2009, the NFPA reports, [Together, candles, matches and lighters were involved in 21 percent of the fires and 12 percent of the deaths.
Three Benefits of Using Flame Retardant in your Home
2021 / 10 / 23
Flame retardants are products in a home that contain chemicals to decrease or eliminate their flammability, and they work in three different ways to inhibit or minimize the severity of a fire. A flame retardant will decrease the presence of oxygen as well as gasses located close to items that are burning. It will inhibit a material`s ability to ignite. Flame retardants also provide a layer of fire resistant material on a product. 1. Fire Prevention Flame retardants are able to provide a number of consumers products with an essential layer of fire protection. According to FireTect, flame retardants are able to stop fires from starting as well as limit their spread and decrease the amount of damage resulting from a fire. Some are designed to work on their own and others act as a synergist. This means they can increase the fire protective abilities of other types of flame retardants. Product manufacturers use a variety of flame retardants. The materials are very different in their chemical composition and physical nature. Various flame retardants react in different ways with fire. This is why so much care is taken to carefully match a flame retardant to the correct material. They all interact at various stages of a fire`s cycle. A home today contains a number electronic devices such as computers, televisions, microwaves and more. This has resulted in high amounts of composite and plastic materials available in a home. It has significantly increased the fire hazard po
2021 / 10 / 23
I believe that we are not unfamiliar with PVC, it is widely used in construction, transportation and household supplies, PVC itself flame retardant, made of products to add a variety of additives so that it does not have flame retardancy. We can add flame retardant in it, is PVC products have flame retardant properties, the following small series with you to discuss this problem. PVC without flame retardant once on fire will cause the flames to spread rapidly and expand the thick smoke and poison gas, to fire fighting and people's lives and property to bring great losses. Especially in recent years, China's continuous fire, only by building decoration materials, electronic appliances and other plastic products burning accidents up to hundreds of. This has become a serious social problem. Therefore, it is urgent to endow PVC products with flame retardancy. Many countries have developed various flame retardant standards for polymer materials, providing that products that do not meet the flame retardant standards are not allowed to be sold. About 10% of plastic products in the United States are flame-retardant, so their use of flame retardants is large. It is second only to plasticizers in plastic additives. And China lags behind abroad in this respect, so it is necessary to add flame retardants to engineering plastics such as PVC wires, cables, PVC decorative materials and daily necessities to meet the flame retardant standards stipulated by the State. China's flame retardant chlorine accounted for 69%, inorganic system only accounted for about 17
Raw Materials Selection and Preparation for PVC foam boards
2021 / 10 / 20
The quality of raw materials such as #PVC resin, #PVC stabilizer, #chemical #foam agent, and #foaming regulator determines the smooth surface & shape of your final PVC foam boards. Be never skimp on raw materials, ensure that the proper amount of each chemical is used in the formula. With 15 years of PVC additives expertise and the broadest offering, Customized Solutions. welcome for inquiry: mandyzhang@novistagroup.com whatsapp:86 13563682728
Raw material requirements for PVC foamed board
2021 / 10 / 20
Raw material requirements PVC resin: Generally, type 8 resin is used. The gelation speed is fast during processing, the processing temperature is relatively low, the product quality is stable, and the density is easy to control. In recent years, many manufacturers have switched to Type 5 resin. Selection of stabilizers: In consideration of environmental protection and good results, rare earth stabilizers are preferred, but due to the relatively high price, they have not been promoted. With the increase of environmental protection requirements in the future, the market for rare earth stabilizers will usher in a bright future. Calcium-zinc stabilizers have problems with zinc burning and slightly poorer stabilizing effects. Currently, the most commonly used is lead salt stabilizers. Foamed boards have a wide cross section, long runners, and yellow foaming to generate more heat. The stabilizer is required to have a high lead content and a good stabilizing effect, otherwise the product is prone to various problems. . Selection of foaming agent: Foaming agent AC emits a large amount of heat during the decomposition process, which easily leads to yellowing in the middle of the cross section. This requires a certain amount of white foaming agent. The decomposition plays the role of absorbing excess thermal energy. The number of agents must be large to achieve uniform foaming without large cells. Foaming regulator: After years of research and development, the process technology of foaming regulator ACR is becoming more and more mature, and the performance quality is more and more stable. According to the thickness of the foamed board, the thin board should be selected to be plasticized quickly, and the thick board should be used. Foaming conditioner with strong plasticized slow solution strength.recommend our TF100/102/530/200, processing aid.
What kind of function does PVC processing aid have?
2021 / 10 / 20
PVC should be added with 1% to 5% of processing aids for PVC resin during processing. ACR is the most widely used processing aid. It is used in the main processing methods of PVC such as extrusion, injection molding, blow molding, blistering and calendering. Got an extremely wide range of applications. For the mechanism of action of ACR as a processing aid modified PVC, the general view is that ACR adheres to PVC resin particles through a long molecular chain, and transfers external heat and shear force to the resin to promote melting and plasticization. It reduces the temperature of the processing process, improves the melt strength, and improves the appearance quality of the product without reducing the rigidity of the rigid polyvinyl chloride.1. It has good compatibility with PVC, good dispersibility, and is entangled with PVC molecular chain to promote PVC melt plasticization, effectively reduce the melt processing temperature of PVC, and improve the weather resistance of the product on the basis of small energy saving. ;2, can change the melt rheological behavior of PVC material, improve the fluidity of PVC material, so that it is easier to form and extrude, ensuring the stability of long-term processing and molding;3, can improve the melt strength of PVC materials, avoid melt fracture, can solve surface problems such as shark skin, improve the intrinsic quality and surface gloss of the product;4. It can effectively prevent pressure fluctuations and flow flaws caused by extrusion during extrusion and injection molding, and effectively avoid surface problems such as ripples and zebra crossings;5, can improve the surface gloss of the product, due to uniform plasticization, and at the same time can help improve the tensile properties, impact strength, elongation at break and other mechanical properties of the product;6, can significantly reduce the deposition of various additives on PVC p
Definition of flame retardant in china
2021 / 10 / 16
The term flame retardants subsumes a diverse group of chemicals which are added to manufactured materials, such as plastics and textiles, and surface finishes and coatings. Flame retardants are activated by the presence of an ignition source and are intended to prevent or slow the further development of ignition by a variety of different physical and chemical methods. They may be added as a copolymer during the polymerisation process, or later added to the polymer at a moulding or extrusion process or (particularly for textiles) applied as a topical finish.[1] Mineral flame retardants are typically additive while organohalogen and organophosphorus compounds can be either reactive or additive. Novista Group supplies APP, MCA, aluminium hydroxide,magnesium hydroxide to global market.
2021 / 10 / 16
Both Reactive and Additive Flame retardants types, can be further separated into several different classes: Minerals such as aluminium hydroxide (ATH), magnesium hydroxide (MDH), huntite and hydromagnesite,[2][3][4][5][6] various hydrates, red phosphorus, and boron compounds, mostly borates. Organohalogen compounds. This class includes organochlorines such as chlorendic acid derivatives and chlorinated paraffins; organobromines such as decabromodiphenyl ether (decaBDE), decabromodiphenyl ethane (a replacement for decaBDE), polymeric brominated compounds such as brominated polystyrenes, brominated carbonate oligomers (BCOs), brominated epoxy oligomers (BEOs), tetrabromophthalic anyhydride, tetrabromobisphenol A (TBBPA) and hexabromocyclododecane (HBCD). Most but not all halogenated flame retardants are used in conjunction with a synergist to enhance their efficiency. Antimony trioxide is widely used but other forms of antimony such as the pentoxide and sodium antimonate are also used. Organophosphorus compounds. This class includes organophosphates such as triphenyl phosphate (TPP), resorcinol bis(diphenylphosphate) (RDP), bisphenol A diphenyl phosphate (BADP), and tricresyl phosphate (TCP); phosphonates such as dimethyl methylphosphonate (DMMP); and phosphinates such as aluminium diethyl phosphinate.[7][8] In one important class of flame retardants, compounds contain both phosphorus and a halogen. Such compounds include tris(2,3-dibromopropyl) p
2021 / 10 / 16
The basic mechanisms of flame retardancy vary depending on the specific flame retardant and the substrate. Additive and reactive flame-retardant chemicals can both function in the vapor (gaseous) or condensed (solid) phase. Endothermic degradation Some compounds break down endothermically when subjected to high temperatures. Magnesium and aluminium hydroxides are an example, together with various carbonates and hydrates such as mixtures of huntite and hydromagnesite.[2][5][6] The reaction removes heat from the substrate, thereby cooling the material. The use of hydroxides and hydrates is limited by their relatively low decomposition temperature, which limits the maximum processing temperature of the polymers (typically used in polyolefins for wire and cable applications). Thermal shielding (solid phase) A way to stop spreading of the flame over the material is to create a thermal insulation barrier between the burning and unburned parts. Intumescent additives are often employed; their role is to turn the polymer surface into a char, which separates the flame from the material and slows the heat transfer to the unburned fuel. Non-halogenated inorganic and organic phosphate flame retardants typically act through this mechanism by gen
PVC doors and windows processing-ACR
2021 / 10 / 01
Processing aids Although rigid PVC has high viscosity, its melt strength is low, and melt fracture may occur at normal shear rates. After adding processing aids, it is entangled and adhered with PVC. , Can effectively prevent melt fracture, significantly improve its tensile strength, bending strength, elongation at break, impact strength and appearance quality, which is very important for high-speed extrusion to increase productivity Meaning. ACR processing aid The molecular structure of processing aids determines the intrinsic properties. Different molecular weights have different effects on processing aids. Different molecular weight and viscosity have a great influence on PVC melt plasticization performance and melt strength. And the appearance of products have different effects. According to its melting point and molecular weight, it can be divided into lubricity, promote plasticization, and improve strength. Low molecular weight processing aids mainly act as internal lubricants and plasticizers. Although plasticized Fast
Intumescent flame retardant basics
2021 / 09 / 18
The flame retardant system of the P-N-based intumescent flame retardant generally comprises three parts, namely a carbon source (often a polyhydroxy compound such as pentaerythritol), an acid source (such as ammonium polyphosphate, ie APP) and a blowing agent (such as melamine). Its flame retardant mechanism (the process of carbon layer formation): (1) The acid source releases a mineral acid at a lower temperature. (about 150 ° C, the specific temperature depends on the nature of the acid source and other components) (2) An esterification reaction occurs at a slightly higher temperature than the acid is released, and the amine in the system can be used as a catalyst for the esterification reaction. (3) The system melts before esterification and during esterification. (4) The water vapor generated by the reaction and the incombustible gas generated by the gas source foam the molten system, and at the same time, the polyol phosphate is dehydrated and carbonized to form an inorganic substance and a carbon residue, and the system is further expanded and foamed. (5) The system gels and solidifies to form a porous foamed carbon layer. Novista Group supplies APP, MCA, aluminium hydroxide,magnesium hydroxide to global market.
2021 / 09 / 18
In order to reduce the cost, many people added some fillers such as calcium carbonate, barium sulfate, talc, magnesium hydroxide, etc. to the P-N-based expanded halogen-free flame retardant, and found that the flame retardant effect was lost. It is because the addition of the above filler changes the esterification reaction process, and the acid source partially reacts with the above filler, and the above filler destroys the formation of the carbon layer on the surface of the material, resulting in failure of the mechanism. By the same token, adding some carbon black and toner will also cause the flame retardant effect to be lost. Therefore, some recycled PP materials may be partially filled with PP and added to the new material, which causes the system to be phased into the above-mentioned filling, which makes the system lose its flame retardant effect. Novista Group supplies equivalent of FP-2100JC, FP-2200S, FP-2500S, Exolit OP1230, OP930, OP1312, OP1314 to global market.
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Mobile Phone:+8615336365800
Email:manager.han@novistagroup.com
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