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Characteristics of additives used in the processing of PVC
2023 / 07 / 22
PVC processing requires the use of many additives, thanks to which it is possible to obtain products for different purposes and with different levels of flexibility.PVC is very easily modified and therefore its properties can be freely customized to very different requirements depending on the intended use.Modification is accomplished through the appropriate selection of PVC blend components.A variety of stabilizers, plasticizers, impact and flow modifiers, fillers, and other additives are used to produce PVC plastics. A feature that distinguishes PVC from other thermoplastic materials is the ability to modify its physical and mechanical properties via plasticizing, which has long been a widely used means of modification.Plasticizers are added to PVC in order to achieve the required level of flexibility of the end product.Their main task is to decrease the Tg (the glass transition temperature) of the PVC, which in turn leads to a lowering of the gelling and moulding temperature during processing.This also leads to a permanent improvement of the properties of the polymer, including itsflexibility, impact resistance and resistance to low temperatures.Plasticizers, which this article provides a general overview of, are one of the wide array of additives used in PVC processing. They will be discussed in more detail in subsequent articles.Plasticizers can be classified based on different criteria, such as: – process characteristics (high-temperature, low-temperature plasticizers), – type of chemical (phthalates, phosphates, polyesters etc.), – molecular weight (monomeric, polymeric). The most common plasticizer groups include: phthalic acid esters (DEHP, DIDP, DINP) (DTDP), adipic acid esters (DINA), (DIDA) – added to products used in low temperatures, sebacic acid esters (DBS), (DOS) – provide PVC plastificates with resistance to low tem
Basics knowledge of PVC foaming regulators
2023 / 06 / 09
A PVC foaming regulator is actually an acrylic resin based processing aid that has all the basic functions of a PVC processing aid, with the difference compared to conventional processing aids. PVC foaming regulator has higher molecular weight and higher viscosity As a common product, PVC foaming regulator, how much do you know about its basic knowledge? Let's take a look at the basic knowledge of PVC foaming regulators. 1. The chemical composition of PVC foaming regulator. A PVC foaming regulator is actually an acrylic resin based processing aid that has all the basic functions of a PVC processing aid, with the difference compared to conventional processing aids. PVC foaming regulators have higher molecular weight and higher viscosity. 2. The main function of foaming regulator in PVC foam products. Promote the plasticization of PVC, and improve the melt strength of PVC foam materials, prevent bubble coalescence, and obtain a uniform foamed product. Preventing insufficient melt strength results in foam sheet foaming, longitudinal pimples and ensuring good melt flow for good product appearance. 3. A simple and effective method for checking melt strength. To determine whether the melt strength is insufficient, the direct method is to wrap the fingers in the middle roll of the sheet and press the three rolls back, the melt strength is good, and the elasticity can be felt when pressing. If the press is hard
2023 / 06 / 09
Choice of PVC impact modifier The selection of impact modifiers should pay attention to the following aspects: 1. The compatibility with PVC resin should be moderate. If the compatibility is too large, the two are completely mixed at the molecular level. The impact modifier may play the role of plasticizer, which is closely attached to the PVC molecules, causing impact The force acts directly on the PVC chain and cannot improve the impact resistance. On the other hand, if the compatibility between the two is too small, the uniform dispersion cannot be achieved, the adhesion to PVC is lost, and the impact force cannot be absorbed. 2. The glass transition temperature should be low, which can improve the impact resistance of PVC at low temperature. 3. The molecular weight should be high, and if necessary, it is best to lightly cross-link to improve the reinforcing effect. 4. It has no obvious influence on the performance and physical properties of PVC. 5. The weather resistance should be good, and the mold release expansion should be small. 6. Good processability for blen
A Brief Introduction of Titanium dioxide (TiO2) -4
2023 / 06 / 02
Chemical properties: Titanium dioxide has extremely stable chemical properties and is a kind of acidic amphoteric oxide. It hardly reacts with other elements and compounds at normal temperature, and has no effect on oxygen, ammonia, nitrogen, hydrogen sulfide, carbon dioxide and sulfur dioxide. It is insoluble in water, fat, dilute acid, inorganic acid and alkali, and only soluble in hydrofluoric acid. However, under the action of light, titanium dioxide can undergo continuous oxidation-reduction reaction and has photochemical activity. This kind of photochemical activity is particularly evident in anatase titanium dioxide under ultraviolet irradiation. This property makes titanium dioxide both a photosensitive oxidation catalyst for some inorganic compounds and a photosensitive reduction catalyst for some organic compounds. Emergency treatment: isolate the leakage contaminated area and restrict access. It is recommended that emergency treatment personnel wear dust masks (full masks) and general work clothes. Avoid raising dust, sweep it carefully, place it in a bag and transfer it to a safe place. If there is a large amount of leakage, cover it with plastic cloth and canvas. Collect and recycle or transport to the waste treatment site for disposal.
What are Optical Brightening Agents?
2023 / 06 / 02
Optical brightening agents (OBAs) / Optical brightener, also known as fluorescent brightening agents (FBAs), are chemical compounds that give whitening effect to fabric. They do this by absorbing light in the ultraviolet and violet regionand re-emit the light in the blue region. This blue light reduces the yellow colour of the substrate and give a brightened look. Unlike bleaching, it doesn`t leave ayellowish tinge and gives a much pleasing whiter-than-white appearance. Such a property sets optical brightening agents apart and makes it a much coveted thing in industries such as Textiles, Plastics, Paper, and Cosmetics. Types of Optical Brightening Agents Based on the number of sulphonic groups, brightening agents can be categorised into three main types.
What Are The Difference Between OB and OB-1?
2023 / 06 / 02
Optical brightener (OB) and Optical Brightener -1(OB-1) are brightening agents often confused with each other. Both are used for brightening but on different types of materials. Therefore, it is essential to understand the details and differences between them before selecting. What is Optical Brightener(OB)? Optical Brighteners have a wide range of applications; fabric whitening is one. Materials such as plastics have a certain level of yellowness that gives them a dull finish. To increase brightness to the products, OB is added to the plastics. A similar application takes place for the fabric. Other colorants are used along with the Optical Brightener to derive the required color and shade in the materials. Optical Brighteners are easily used in plastics as they have a high melting point which helps them easily mix with the molten plastic. What is OB-1? OB-1 has a similar effect but with different chemical formulas and applica
Advantages and disadvantages of commonly used flame retardants
2023 / 05 / 27
In recent years, with the increase in the output of plastic products and the improvement of safety standards, flame retardant materials are more widely used. Generally speaking, flame retardant materials can be divided into organic flame retardant materials and inorganic flame retardant materials. The organic flame retardant has good flame retardant effect and the addition amount is relatively small. However, organic flame retardants have the drawbacks of generating large amounts of smoke and releasing toxic gases during combustion. Inorganic flame retardants have the advantages of non-toxic, smoke-free, non-volatile and cheap, but the amount of addition is relatively large. 1. Halogen flame retardant Halogen flame retardants are not only large in output, but also widely used. The material added with the flame retardant can release hydrogen halide and obtain free radicals during the combustion process, thereby preventing the transfer of the combustion chain, and then generating free radicals with low activity to slow down the combustion. Halogen flame retardants are generally used in thermoplastic materials and thermosetting materials. They not only have good compatibility with polymer materials, but also are easy to use. Therefore, they are welcomed by the market and are widely used in automobile, packaging, textile and other industries. 2. Phosphorus flame retardant Inorganic phosphorus flame retardants mainly include phosphates, red phosphorus, etc. Red phosphorus is widely used. Red phosphorus is a good flame retardant, but in practical applications, red phosphorus flame retardant materials are easy to
2023 / 05 / 27
Flame retardants are chemicals added to materials to interfere with combustion. This disturbance is usually to achieve some desired refractory properties - slow ignition, reduce flame spread, etc. Widely used in plastic, wood and textile fire protection. Phosphorus flame retardants (including organic phosphorus and inorganic phosphorus) can carbonize the combustion material to achieve a flame retardant effect. This flame retardant effect mainly plays a role in the solid phase. In order to impart basic flame retardant properties to plastics, inorganic fillers (aluminum hydroxide, magnesium hydroxide) have also been used, which can release water molecules by thermal decomposition. Novista Group supplies equivalent of FP-2100JC, FP-2200S, FP-2500S, Exolit OP1230, OP930, OP1312, OP1314 to global market. PVC Impact Modifier PVC Additives PVC Processing Aid Acrylic Impact Modifier Acrylic Processing Aid PVC Heat Stabilizer PVC Lubricant CPVC Compound CPVC Additives
Application and advantages of brominated flame retardants
2023 / 05 / 27
Bromine is used as a flame retardant, in addition to mercury removal, air purification and other fields. With the wide application of polymer materials such as plastics in household environments, public places and vehicles, flame retardants have increasingly become a must-added fire retardant. Currently, flame retardants are mainly used in four fields: transportation, electronic and electrical equipment, furniture, and buildings and construction materials. There are more than 200 kinds of flame retardant family products, which can be divided into bromine-based, phosphorus-based, nitrogen-based, silicon-based and inorganic flame retardants according to different elements. There is also an inevitability to this diversity, as the materials and products that are to be fire resistant vary widely in properties, composition and even application. Some flame retardants may be very suitable for some specific applications, but not in other areas. That is, there is no one flame retardant, and different solutions must be selected according to different applications. Material engineers will select suitable flame retardants according to the structure and properties of materials. For example, 80% to 90% of printed circuit boards use brominated flame retardants. Brominated flame retardants are very efficient and can capture free radicals in the combustion chain reaction, terminating or slowing down the chain reaction, thus playing a role in fl
2023 / 05 / 20
Flame retardant is a kind of additive which can prevent the ignition of polymer materials or inhibit the flame propagation. Common and important flame retardants are compounds of phosphorus, bromine, chlorine, antimony and aluminum. Flame retardants can be divided into additive type and reactive type. The additive flame retardants mainly include phosphate ester, halogenated hydrocarbon and antimony oxide. They are mixed into the composite during the processing of composite materials. They are easy to use and have a wide range of applications, but they have an impact on the properties of the composite materials. Reactive flame retardant is a kind of monomer material added into the polymerization system in the process of polymer preparation, which is compounded to the polymer molecular chain through chemical reaction. Therefore, it has little effect on the properties of the composite and has a long flame retardancy. Reactive flame retardants mainly include phosphorus containing polyols and halogenated anhydrides. The flame retardants used in composite materials should have the following properties: 1) high flame retardant efficiency, which can give the composite good self extinguishing or flame retardant properties; 2) it has good compatibility with the composite materials and is easy to disperse; 3) it has a suitable decomposition temperature, that is, it does not decompose at the processing temperature of the composite, but can decompose rapidly when the composite is decomposed by heating The results show that the flame retardant effect is not toxic or low toxic, odorless and pollution-free, and no toxic gas is produced in the process of flame retardant; 4) when used with composite materials, the mechanical properties, electrical properties, weather resistance and thermal defor
Flameout method of flame retardants
2023 / 05 / 20
1. It produces a gas that smothers the flame. For example, antimony trioxide reacts with HCl from combustion in PVC to form a smoldering gas, namely antimony nitrogen oxide. 2. It can absorb the heat produced during combustion and cool down the combustion rate. For example, aluminum hydroxide contains up to 34% of chemically associating water in its molecules, which remains stable at the processing temperature of most plastics, but begins to decompose when it exceeds 200 ℃ and releases water vapor. And every gram of aluminum hydroxide decomposition, to absorb 36 kcal heat. 3. It provides a coating insulated from oxygen. For example, the phosphide produced by the combustion of phosphate flame retardant is an oxygen barrier coating. 4. It can form free radicals which can react with plastics and act as flame retardant. The combustion properties of the products from their reaction with plastics are very poor. Novista Group supplies equivalent of FP-2100JC, FP-2200S, FP-2500S, Exolit OP1230, OP930, OP1312, OP1314 to global market
Introduction of NOVISA's PVC Heat Stabilizers-4
2023 / 05 / 19
FAQS WHAT ARE THE BENEFITS OF USING ONE PACK PVC HEAT STABILIZERS? There are several benefits of using our one pack PVC Heat Stabilizers that include: reduced labour cost, reduced handling losses, reduced inventory, a better homogenous mixture from processing. We provide PVC Heat Stabilizers (one pack- lead-based) in powder and flakes form, that can be modified as per the needs and requirements of the customers. WHAT IS THE PREFERRED DOSAGE OF PVC HEAT STABILIZERS? The dosage of stabilizers per hundred parts of resin ( PVC ) is 2.5-3.5 phr in pipes and 3.0 to 12.0 phr in different types of cables, but it depends on lead content in stabilizer and the filler used by PVC product manufacturer. If the filler is more, the dosage required is more. Detailed application knowledge and formula/recipe for any customer can be provided by our technical services managers.
What are the standards for the selection of flame retardants for nylon?
2023 / 04 / 08
Nylon has excellent properties and is widely used. Unmodified nylon has low flame retardancy, vertical combustion can only reach UL94V-2 level, oxygen index is about 24%, it will drip during combustion, it is a flammable material, and it is very easy to use in the process. Yes. catch fire. Therefore, reformed nylon flame retardants have become a common concern and research topic in today's academic and industrial circles. Next, Silver Plastic introduces the knowledge about nylon flame retardants. At present, the flame retardant modification of nylon materials is usually divided into halogen-containing flame retardant modification and halogen-free flame retardant modification. One. Halogen-containing flame retardant systems The most widely used abroad is brominated styrene polymer, which has excellent thermal stability and is being processed because it can be melt-mixed with nylon. The fluidity of the medium is good. In addition, the flame-retardant nylon prepared by using it also has excellent electrical, physical and mechanical properties. The limitations of this flame retardant are its low light stability and incompatibility with nylon. It is also more expensive than decabromodiphenyl ether, which is widely used in China. Another flame retardant that has been used in nylon for many years is flammable. It is a chlorine-containing flame retardant with high efficiency and electrical properties, but thermal stability. Due to this limitation, it is only suitable for nylon flame retardant systems with low processing temperatures.
Effects of Flame Retardant and Glass Fiber on the Properties of PA66
2023 / 04 / 08
Due to the needs of electronic product applications, PA66 must have certain flame retardancy and relative tracking index (CTI) properties. Also, depending on product strength requirements, it may be necessary to add glass fibers to the PA66 material. Commonly used flame retardants are nitrogen flame retardants, bromine flame retardants and red phosphorus. (1) Under normal circumstances, the flame retardant grade of pure nylon PA66 is UL94V-2, and the CTI value can reach CTI600. (2) When glass fiber is added to pure PA66 to increase the strength, the glass fiber is used as the core, which reduces the flame retardant grade of the material and becomes UL94-HB grade. (3) Using nitrogen-based flame retardant for PA66 and no glass fiber, it can reach UL94V-0, and the CTI value can reach 600V. (4) When glass fiber is used in PA66 and nitrogen-based flame retardant is added, the flame retardant performance of the material will also deteriorate and reach HB level. (5) PA66 also becomes UL94V-0 flame retardant grade when brominated flame retardant is added, and in the case of glass fiber reinforced material, it becomes UL94V-0 grade. However, the addition of bromide greatly reduces the CTI index of the material. Basically CTI175 or CTI250 grade. Low CTI limits the application of PA66. All Glow Wire 750 PA66 materials required by the industry are brominated flame retardants. Of course, the CTI value is not high. (6)
Flame retardant: an essential patron saint of safety
2023 / 04 / 08
On July 6, 2013, Asiana flight 214 crashed when it landed in San Francisco, its fuselage caught fire and emitted thick smoke. In this accident, although the plane caught fire, the vast majority of passengers survived smoothly. It is a kind of chemical product widely existing in our life, but often ignored, that is flame retardant. As a conventional means of fire prevention, flame retardants are widely added to a variety of materials. Flame retardant is indeed the invisible patron saint of life. Flame retardant is a kind of additives which can delay the ignition time and inhibit the spread of fire. They inhibit the occurrence of combustion reaction through a variety of action principles. Inorganic flame retardants such as aluminum hydroxide and magnesium hydroxide generate water when heated, which absorbs a large amount of heat in the process, and also plays the role of isolating oxygen; brominated flame retardants can capture the free radicals in the combustion reaction and terminate the occurrence of chain reaction; in addition, some flame retardants can make the surface of materials rapidly expand and carbonize to form a protective layer. From plastic products, synthetic leather, chemical fiber fabrics to foam insulation materials in buildings, there are polymer materials everywhere in our lives. These materials have many advantages in performance, but there is an obvious defect: they are easy to burn, thus burying a fire hazard. In order to eliminate the hidden danger, it is necessary to use flame retard
Analysis of three kinds of flame retardants
2023 / 03 / 25
1) Organic halogen flame retardant Organic halogenated flame retardants refer to organic flame retardants with halogen as the main flame retardant components. Due to their high flame retardant efficiency, low consumption and small impact on the properties of materials, they have been widely used in the flame retardant market since the 1960s. Brominated flame retardants are the representative of organic halogenated flame retardants. Among all the sales of organic halogenated flame retardants, the sales volume of brominated flame retardants has been ranked first. In particular, about 70% of the flame retardants used in electronic and electrical products are brominated flame retardants. The representative products of brominated flame retardants are tetrabromobisphenol A and decabromodiphenylethane, which account for about 50% of the total production of brominated flame retardants. However, the disadvantages of brominated flame retardants in environmental protection and safety are also increasingly apparent. Because most of the flame retardant mechanisms of brominated flame retardants are gas phase flame retardants, a lot of smoke, corrosive gases and toxic gases will be produced when they are used as flame retardants, Some brominated flame retardants will release hydrogen halide gas and dioxins (polybrominated dibenzo-dioxins and polybrominated dibenzofuran) which are harmful to human body and environment during the combustion process. Most of the brominated flame retar
Common polypropylene(PP)flame retardant systems and application characteristics
2023 / 03 / 25
As a common modified material, flame retardant polypropylene is mainly used in small household appliances, electronic appliances, automobiles and other fields. It has the advantages of high cost performance, large room for performance adjustment, and easy molding. At present, there are many researches and applications on flame retardant polypropylene, but the common flame retardant systems on the market are nothing more than the following four categories: (1) PP resin + bromine + antimony Novista@B044+Novista@ATO (2) PP resin + expanded carbon flame retardant system (APP system) Novista@PNPO (3) PP resin + new type of expanded carbon flame retardant system (non-APP system) Novista@PNPO-G1 (4) PP resin + phosphorus-nitrogen-bromine high-efficiency flame retardant (V2 system) Novista@EFBPP101
What is halogen free? Are halogen-free flame retardants completely halogen-free?
2023 / 03 / 25
1. What is the concept of halogen-free? Halogens are listed in Group VIIA of the periodic table and belong to non-metallic elements, including five elements: Fluorine, Chlorine, Bromine, Iodine, and Astatine. Halogen often refers to the four elements of fluorine, chlorine, bromine and iodine, which usually exist in the form of organic compounds in products, especially in polymer materials. 2. The origin of the halogen-free concept. Halogen Free or Non-Halogen, according to the requirements of regulations IEC 61249-2-21: bromine and chlorine content are less than 900ppm respectively, and the sum of bromine and chlorine content is less than 1500ppm, it is halogen-free. Therefore, halogen-free is not really halogen-free, but the halogen content in the product is below a certain value. 3. Why put forward the concept of halogen-free? Halogens are often used as flame retardants in electronic components and materials, product casings, plastics, etc. Halogen flame retardants are almost difficult to recycle and release harmful substances during combustion and heating, threatening human health, the environment and future generations. Therefore, corresponding halogen restriction requirements have been formed in various countr
2023 / 03 / 18
Flame retardants help prevent and slow fires, protect property and save lives. They are an important tool in the overall [tool box" of fire safety measures that help reduce fire risk and meet fire safety standards. Flame retardants can provide an important layer of fire protection by: · Preventing and delaying ignition; · Slowing the combustion process; and · Making a material self-extinguishing. A foremost benefit of flame retardants in product design is they can stop small ignition events from turning into larger fires. Have you ever noticed sparks, overheating, melt
2023 / 03 / 18
Flame retardants are derived from naturally-sourced elements and are incorporated into materials such as plastics, textiles, foams, and paints. Flame retardants can be liquids or solids. They can be chemically transformed to create a new fire resistant material (reactive) or physically incorporated into a material (additive). Reactive flame retardants are incorporated into the polymer or material via a chemical reaction. Once reacted, reactive flame retardants cease to exist as separate chemical entities because they have been transformed into a new fire resistant material. They are engineered to become a new fire protected material, and therefore are a permanent part of the material itself. Additive flame retardants are incorporated into and encased by the material they are designed to protect by physical mixing.
Not all flame retardants are the same
2023 / 03 / 18
Manufacturers include specific flame retardants in their products based on the product`s attributes, properties, use, and potential ignition threats. Product manufacturers use flame retardants to protect materials from igniting. The term [flame retardant" refers to a function, not a distinct family of chemicals. Many different chemistries, with different properties and molecular structures, act as flame retardants. A variety of flame retardants are necessary because materials and products that need to be made fire-resistant are chemically and physically different and have different uses and performance requirements. Flame retardants are generally classified by their chemical makeup. The most common flame retardant classes Halogenated (a compound that includes a halogen, e.g., chlorine,
Introduction of NOVISA's PVC Heat Stabilizers-1
2023 / 03 / 17
NOVISTA is one leading PVC heat stabilizer manufacturers from China, involved in the production of PVC heat stabilizers of premium quality. Starting from a single reactor the company now has grown multi-fold to be the leading PVC additives manufacturer. One of the key players in the PVC additives industry, we have been the preferred PVC heat stabilizer suppliers in the world, supplying high performance stabilizers to a large number of PVC manufacturing companies across the world. We are committed to providing our customers best quality products at competitive prices. With fast and reliable supplies, we have grown into the most reliable brand in the industry, established trust based relations with leading PVC processors worldwide, and have become a leading PVC heat stabilizers suppliers and exporters in the world. THE PRODUCT - PVC HEAT STABILIZERS PVC Stabilizer >
Introduction of NOVISA's PVC Heat Stabilizers-2
2023 / 03 / 17
Conventionally, a combination of three chemicals, TBLS, DBLS, and LS (Tribasic lead sulphate, dibasic Lead stearate, and Lead stearate) were used as heat stabilizers along with Calcium Stearate as a co-stabilizer. NOVISTA Group is the leading manufacture of these single stabilizers in the highest purity and performance. Nowadays, one–pack stabilizer is used in place of the three chemicals as a heat stabilizer. It is made by in-situ reaction of lead oxide with stearic acid along with many other components like waxes, antioxidants, inorganic stabilizers etc, which were not there in the conventional system of single stabilizers above. Its performance depends on two things: The lead oxide content which provides stabilization by deactivating the chloride radical formed during heated melt processing of PVC during extrusion and by providing lubrication so that the residence time inside the screw extruder (heated zone) is reduced, so less deterioration is there. NOVISTA Group produces a dozen of popular one-pa
Introduction of NOVISA's PVC Heat Stabilizers-3
2023 / 03 / 17
WHY CHOOSE US AS YOUR PVC HEAT STABILIZERS SUPPLIERS? NOVISTA has been a leading name as PVC heat stabilizer manufacturers in the world, known for providing products that are backed by a superior quality guarantee and that conform to international standards. We have a fully-equipped, in-house laboratory with trained and experienced specialists who work with customers to develop products as per specific needs and requirements. Our PVC laboratory has two roll mixing mills, Rheometers, moulding press for making sheet, Congo red testers, VR/ IR testers, pilot extrusion lines etc... The application lab helps us in developing value added products and providing technical support to our customers. We are a company that thrives on providing technical support to cater the customer needs. We make sure that our products pass a series of quality control checks before they reach our customers. Our stringent quality checks procedures are inspected regularly in order to maintain the highest international standards. Our R&D constantly strives hard to produce only the best quality products.
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Mr. Ron Han
Tel:86-536-8206760
Fax:86-536-8206750
Mobile Phone:+8615336365800
Email:manager.han@novistagroup.com
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Privacy statement: Your privacy is very important to Us. Our company promises not to disclose your personal information to any external company with out your explicit permission.