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02/26/2019

Application of PVC_ACR low temperature impact modifier

PVC plastic doors and windows due to its excellent insulation, noise reduction, sealing and other characteristics, which has been widely used. Especially in cold areas of northern China and areas prone to sandstorms, more fully demonstrated the incomparable superiority. However, PVC plastic windows after years of use also revealed some weaknesses, such as low temperature impact resistance, cracking, aging discoloration and other issues. Application of Impact Modifier at Home and Abroad Since the introduction of PVC plastic door and window manufacturing technology in the 1980s in our country, the impact modifier is mainly based on CPE, and our country's production capacity is strong, the output is large, there is a trend of oversupply. Therefore, the domestic production of PVC plastic window profiles using CPE as an impact modifier is very common. Due to the fierce competition in the market for the production of CPE, individual manufacturers have won in quantity and neglected the quality of their products, affecting the stability of the product quality of some PVC window profiles manufacturers. Such as the thermal deformation temperature drops, the process is unstable, impact performance due to the quality of CPE fluctuations, a direct impact on the PVC plastic window quality. Although many professional and technical personnel have noticed in the formula design PVC low temperature impact resistance and other issues, but always around CPE as a modifier to improve low temperature impact resistance, so the actual effect is not obvious. With the progress of technology, the emergence of a new domestic impact modifier ACR, the trial has obviously improved the PVC plastic window low temperature impact resistance and other issues. After 90 years, with the increase of production of acrylic acid ester (ACR) in our country, the cost will drop, which will make more PVC plastic window profile factory adopt. The superiority of ACR shows more and more the effect of improving low temperature impact resistance of PVC, reducing cracks and improving aging discoloration. At present, the impact modifiers used in foreign countries, especially in Europe, are mainly ACRs, which are obviously superior to CPEs and other modifiers. Therefore, the application of ACR is an important way to improve and improve PVC plastic window performance. Impact modifier selection The choice of impact modifier should pay attention to the following aspects: 1, compatibility with PVC resin should be moderate, if the compatibility is too large, two completely molecular mixture, impact modifier may play a role as a plasticizer, and PVC molecules are closely attached, leaving the impact Force directly on the PVC chain, can not improve the role of anti-impact. On the contrary, if the compatibility between the two is too small to achieve uniform dispersion, the adhesion to PVC is lost and the impact can not be absorbed. 2, the glass transition temperature is low, can improve the impact resistance of PVC at low temperature. 3, high molecular weight, if necessary, the best light cross-linked to enhance the enhancement effect. 4, the performance of PVC performance and physical properties had no significant impact. 5, weatherability should be good, small mold expansion. 6, good blends with PVC technology. 7, heat resistance (resistant to deformation, thermal stability) is better. 8, economy. Properties and Application of Acrylic Series Impact Modifier As acrylate is a "core-shell" structural elastomer, giving it a series of advantages: Excellent impact resistance The impact resistance of "core-shell" structure is better than network structure polymer (CPE, EVA). As far as the glass transition temperature is concerned, the CPE is -10 ° C to -20 ° C, while the acrylate is up to -56 ° C, so that the low-temperature impact performance is obviously superior to that of CPE. The latest development of the TAE-858 glass temperature up to -60 ℃ above, to improve the profile low temperature impact performance is significant. A wide range of processing technology, operation process and stability CPE processing temperature range is narrow, because the structure of PVC and PVC close, high temperature (185 ℃), good mixing, easy to damage the network structure, resulting in decreased impact resistance. If the temperature is low, poor plasticization, poor dispersion, but also affect the impact, appearance and other properties, and acrylic impact modifier does not exist the above problems, processing temperature is wide, easy to operate, high yield, stable production Good sex. Lower thermal shrinkage, dimensional stability Good use of ACR impact modifier P V C profiles generally 100 ℃, 60 minutes lower shrinkage, usually below 1.5%. The CPE is higher, generally more than 1.5% (standard requirements ≤ 2.5%). The practical significance of this project is to test the longitudinal stress of PVC profiles. The factors affecting the size of longitudinal stress are th
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 Application of PVC_ACR low temperature impact modifier
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03/27/2019

Application of PVC_ACR low temperature impact modifier

PVC plastic doors and windows have been widely used due to their excellent heat preservation, noise reduction, and sealing properties. Especially in cold areas and sandstorm-prone areas in northern my country, it has fully demonstrated its incomparable superiority. However, PVC plastic windows have also exposed certain weaknesses after years of use, such as poor low-temperature impact resistance, cracking, aging and discoloration. Application of impact modifiers at home and abroad Since my country introduced PVC plastic door and window manufacturing technology in the 1980s, impact modifiers have basically been CPE, and my country has strong production capacity and large output, and there is a trend of oversupply. Therefore, it is very common for domestic enterprises to produce PVC plastic window profiles to use CPE as an impact modifier. Due to the fierce market competition among companies producing CPE, individual manufacturers win by quantity and ignore product quality, which affects the stability of product quality of some PVC plastic window profile manufacturers. For example, the heat distortion temperature drops, the process is unstable, and the impact performance fluctuates due to the quality of CPE, which directly affects the quality of PVC plastic windows. Although many professional and technical personnel have noticed the low-temperature impact resistance of PVC plastic windows in the formulation design, they always focus on CPE as a modifier to improve the low-temperature impact resistance, so the actual effect is not obvious. With the advancement of technology, the emergence of the new domestic impact modifier ACR has significantly improved the low-temperature impact resistance of PVC plastic windows and other issues after trials. After the 1990s, with the increase in the production of acrylic ester (ACR) in my country, the cost fell, and more PVC plastic window profiles production plants used it. The superiority of ACR shows more and more the effect of improving the low-temperature impact resistance of PVC, reducing cracking, and improving the aging and discoloration problems. At present, the impact modifiers used abroad, especially in Europe, are mainly ACR, whose performance is significantly better than CPE and other modifier products. Therefore, the application of ACR is an important way to improve and improve the performance of PVC plastic windows. The choice of impact modifier The choice of impact modifier 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 act as a plasticizer and adhere closely to the PVC molecules, causing impact The force acts directly on the PVC chain, and cannot improve the impact resistance. On the contrary, if the compatibility of the two is too small to achieve uniform dispersion, the adhesion to PVC will be lost, and the impact force will not be absorbed. 2. The glass transition temperature should be low, which can improve the impact resistance of PVC at low temperatures. 3. The molecular weight should be high, and light cross-linking is best if necessary to improve the reinforcement effect. 4. It has no obvious influence on the performance and physical properties of PVC. 5. Good weather resistance and low mold release expansion. 6. Blending with PVC has good manufacturability. 7. Heat resistance (deformation resistance, thermal stability) is better. 8. Economy. The characteristics and application of acrylate series impact modifiers Because acrylate is a "core-shell" structural elastomer, it gives it a series of advantages for modification: Excellent impact resistance The impact resistance of the "core-shell" structure is better than that of the network structure polymer (CPE, EVA). As far as the glass transition temperature is concerned, CPE is -10℃~-20℃, and acrylate can reach -56℃, so the low temperature impact performance is obviously better than CPE. The newly developed TAE-858 has a glass transition temperature of over -60℃, which has a significant effect on improving the low-temperature impact performance of the profile. Wide range of processing technology, stable operation technology The processing temperature range of CPE is narrow, because the structure of chlorinated polyethylene is close to that of PVC, the temperature is high (185°C), the blending property is good, the network structure is easily destroyed, and the impact resistance is reduced. If the temperature is low, the plasticization is not good, the dispersion is poor, and it will also affect the impact, appearance and other properties. However, the acrylic impact modifier does not have the above problems, the processing temperature is wide, the operation is easy, the yield is high, and the production is stable. Good sex. Low thermal shrinkage, dimensional stability P V C profiles that use AC R impact modifiers ge
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Application of PVC_ACR low temperature impact modifier
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03/27/2019

Development and function of processing aids for plastics

The global plastics industry is developing very rapidly, with an average annual growth rate of 4% to 6%, surpassing the growth level of global GDP. The main reason for this growth is that plastic materials continue to replace traditional materials such as metal, wood, and minerals. In fact, various additives added to the resin are also very helpful for the successful application of plastic materials. Among the various types of additives used, polymer impact modifiers and processing aids provide polymers with the most unique and valuable outstanding performance, while also improving the processing performance of the product. Toughening treatment, rheological property control, aesthetic appearance, processing performance and economic factors are all important properties. All kinds of these additives have been used for many years, and a wide range of varieties have been derived after long-term development. One of the main reasons for this is the variety of emulsion polymerization processes, which makes scientists continue to design suitable polymer components, polymer structure, polymer morphology, and polymer molecular weight/molecular weight distribution. Due to the low production cost and the easy separation of the obtained emulsion products, emulsion polymerization is still very attractive in commercial production. There are many plastic materials whose application range is very limited. This is because they either do not have the required physical properties or have very poor processing properties. Processing aids are used to enhance the melt processability of plastics, increase production, and reduce downtime. Overhaul time and provide better quality of products. In the 1950s, Rohm and Haas took the lead in developing the first commercially produced processing aid product, which was used in the production of rigid PVC. After that, this unprecedented technology was quickly known by the industry, and thus triggered a production boom in the PVC industry. Since the 1980s, such research and development work began to be carried out for other thermoplastic materials and polymer blend products. Most of the processing aids are usually added in PVC, while the processing aids used in other thermoplastics are very few (only 0.5% to 5%), but nonetheless, these processing aids can significantly Improve processing performance, while not having too much impact on other application performance. According to different functions, processing aids can be divided into fluxes, melt rheology modifiers, lubricants and dispersion accelerators. In fact, each type of processing aid has more than one effect. The functionality and application effect of any processing aid depends on its chemical composition, polymer structure, polymer molecular weight, and polymer matrix type. PVC processing aids As we all know, for thermoplastic resins, the mechanical properties of the final product are closely related to the homogeneity of the polymer melt during the conversion process. Unlike most other thermoplastic resins, rigid PVC cannot be processed directly due to its inherent particle structure. It requires a long processing time at high temperatures, which in turn often leads to thermal degradation. Processing aids bring many benefits to PVC resin, mainly related to the melting process and melt rheology during processing. Processing aids help to improve the bonding force and uniformity of the melt, and enhance the melt strength, melt ductility and melt elasticity. The components of processing aids and their polymer structure will affect the compatibility of the additives with PVC, and will change some properties, such as fluxing properties and lubricating properties. On the other hand, the molecular weight and molecular weight distribution of processing aids play a key role in controlling the rheological properties of the melt. The most common processing aids are methacrylate polymers. Polymethyl methacrylate (PMMA) polymers have a high glass transition temperature (Tg), and it has excellent compatibility with PVC materials. These properties are conducive to the generation and transmission of local shear heat, thereby Promote the melting of PVC in the melting stage. In addition to the melt rheological properties, improving dispersion performance, improving processing efficiency, and enhancing the overall balance of various properties (especially the melt strength corresponding to viscosity) are the main directions and goals for the development of new processing aids. On the one hand, this development trend requires processing aids to achieve the same effect with a small amount. In addition, in applications that require uniform color and transparent materials, they also require materials to be more easily dispersed and more uniform and transparent. 1, accelerated melting and melt homogeneity The most common way to monitor the PVC melting process is to use a Brabender Plasticorder or Haake Rheometer. Figure 2.1 shows the curve of the p
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Development and function of processing aids for plastics
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06/17/2014

Plastic products gradually outlaw metal products

In today's environment where the plastics market is expanding day by day, the world's plastics industry is in a state of development. The global growth rate of plastics has reached 4% to 6%, and has now exceeded the global GDP growth level. At present, in our lives, plastics have replaced metal, wood, minerals, etc. in many fields. The use of plastic products continues to increase, which makes the PVC industry continue to expand. Technology is the key to ensuring product quality. When we produce and process PVC products, we will use a variety of PVC processing aid products, PVC processing There are many types of additives: plasticizers, heat stabilizers, pigments, catalysts and so on. Different PVC processing aids have different effects on PVC. In the process of using various PVC processing aids, polymer impact modifiers and processing aids provide polymers with the most unique and valuable outstanding performance, while also improving the processing performance of the product. Toughening treatment, rheological property control, aesthetic appearance, processing performance and economic factors are all important properties. All kinds of PVC processing aids have been used for many years, and a wide range of varieties have been derived after long-term development. Due to the variety in the emulsion polymerization of PVC processing aids, scientists continue to design suitable polymer components, polymer structure, polymer morphology, and polymer molecular weight and molecular weight distribution. "Because the production cost of PVC processing aids is low, and the resulting emulsion products are easy to separate, emulsion polymerization is very attractive in commercial production. In 1956, the first PVC processing aid used in emulsion polymerization technology was developed. It was a core-shell structure impact modifier prepared from methacrylate-butadiene-styrene (MBS). Then came various acrylic processing aids and acrylic impact modifiers. Initially, these additives were mainly used to improve the processing properties and toughness of polyvinyl chloride (PVC). The main purpose of PVC processing aids is to promote the melting of PVC, improve melt strength, improve dispersion performance and surface quality. Ultra-high molecular weight processing aids are an important part of foamed PVC. With the help of processing aids, PVC foam can obtain a more uniform foam structure, reduce the rupture of closed bubbles, and the foam density will be lower. The lubricating processing aid can effectively prevent the molten plastic from sticking to the metal surface, improve the surface quality of the product, and increase the production efficiency. There are many plastic materials whose application range is very limited. This is because they either do not have the required physical properties or have very poor processing properties. PVC processing aids are used to enhance the melt processability of plastics, increase production, and reduce Stop overhaul time and provide better quality of products. In the 1950s, Rohm and Haas took the lead in developing the first commercially produced processing aid product, which was used in the production of rigid PVC. After that, this unprecedented technology was quickly known by the industry, and thus triggered a production boom in the PVC industry. Since the 1980s, such research and development work began to be carried out for other thermoplastic materials and polymer blend products. Most of the processing aids are usually added in PVC, while the processing aids used in other thermoplastics are very few (only 0.5% to 5%), but nonetheless, these processing aids can significantly Improve processing performance, while not having too much impact on other application performance. According to different functions, processing aids can be divided into fluxes, melt rheology modifiers, lubricants and dispersion accelerators. In fact, each type of processing aid has more than one effect. The functionality and application effect of any processing aid depends on its chemical composition, polymer structure, polymer molecular weight, and polymer matrix type.
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Plastic products gradually outlaw metal products
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