Amoy Coace Plastic Technology Co.,Ltd
Add:No.131 Xifu Road, Tong'an District, Xiamen City,China
Contact us:Micheal li
What are the main varieties and characteristics of impact modifiers?
1. Methyl methacrylate-butadiene-styrene copolymer
Nature of a triblock copolymer, is a modified product of polystyrene and ABS resin, the appearance of light yellow transparent granules or white powder, odorless. The relative density of 1.07 ~ 1.11. This product is resistant to inorganic acids, alkali and grease, but also has good resistance to UV toughness but not resistant to ketones, aromatics, chlorinated hydrocarbons and fuyou hydrocarbons and other solvents. The heat distortion temperature is 75 ° C and is still benign at -40 ° C.
Usage and its characteristics This product is used as the impact modifier of PVC, PVC impact strength can be increased by 6 to 15 times, while the tensile strength, elongation and other mechanical properties of small impact. This product has good transparency, heat resistance and low temperature characteristics, but also rigid PVC transparent products indispensable additives, commonly used in the manufacture of packaging containers, sheet metal, pipe and soft products. Add the amount of plastic weight is generally 10% to 20% is appropriate, more than 30%, there will be brittle damage.
2. Acrylonitrile-butadiene-styrene copolymer
Nature of a thermoplastic, the appearance of light yellow powder or ball, non-toxic, odorless, the relative density of 1.02 ~ 1.08, softening temperature of not less than 90 ℃, melting temperature of 217 ~ 237 ℃, thermal decomposition temperature higher than 250 ℃ The This product is water, inorganic salts, acid and alkali, insoluble in most alcohols and hydrocarbons, soluble in acetone, benzene, dichloroethane and chloroform. By the role of ultraviolet aging, weatherability slightly worse. Flammable
Usage and its characteristics This product is used as PVC impact modifier, the impact of the impact of enhanced strength, leaving the tensile strength decreased little. The general amount of plastic weight of 5% to 20%. Because this product contains unsaturated structure, poor weather resistance, does not apply to long-term use in outdoor products. This product is also used as modified acrylic fastener structure of the toughening agent.
3. Chlorinated polyethylene
Nature This product is from the vinyl chloride and chlorine through the substitution reaction prepared by the modified polymer. The chlorine content is generally 25% to 45% (mass fraction). With the polymer relative molecular mass, chlorine content, molecular structure and chlorination process conditions are different, this product presents a rigid plastic to rubber different properties. The appearance of this product is white granules, the relative density of l.14 ~ 1.18, thermal decomposition temperature of wood below 160 ℃. This product has excellent impact resistance, cold resistance, weather resistance, oil resistance, chemical stability and electrical insulation. Chlorinated polyethylene with chlorine content of more than 25% (mass fraction) has self-extinguishing. And PVC and inorganic fillers have good compatibility.
Usage and its characteristics This product is widely used as the impact of PVC modified modifier. Compared with MBS and ABS resin, this product has a strong weather resistance, and PVC with good compatibility characteristics, the impact of the aging time with the slow decline. This product can be used for building materials, pipe and corrugated board and other outdoor use of products, the amount is generally 5 to 15 copies. This product is used for high density polyethylene, can improve its toughness, flame resistance and printing; for EVA microporous soles, can improve its wear resistance and high elasticity; for adhesives, can improve its toughness and flame retardant Sex.
4. Ethylene-vinyl acetate copolymer
Properties A thermoplastic polymer. Due to the introduction of the short chain of the polar group (CH3COO-) in the ethylene branch, the original crystalline state is changed, making the EVA more flexible and elastic than polyethylene, and is a kind of rubber with similar elasticity Of the thermoplastic. The appearance of this product is white to light yellow powder or granular, the relative density of 0.92 ~ 0.95, the refractive index of 1.480 ~ 1.510, crisp temperature below -70 ℃, processing temperature 180 ~ 220 ℃, thermal decomposition temperature of 229 ~ 230 ℃. This product has good chemical stability, anti-aging, ozone resistance, but poor oil resistance. Non-toxic
Usage and characteristics This product is used as PVC impact modifier, and polyvinyl chloride (PVC) compatibility, and its effect with the copolymer of vinyl acetate (VA) content varies. This product is low when the VA content is poor compatibility with PVC, the enhancement effect is low, the product is opaque, close to the nature of low density polyethylene; with the VA content increased, the compatibility of the copolymer and PVC become better, enhance the effect, Transparency of the product is also improved, close to the nature of the rubber. VA content is generally between 35% to 45% is better. This product is also used for polyethylene, polycarbonate and other modified and manufacturing hot melt adhesive, pressure sensitive adhesive, adhesive tape, white latex and so on.
5.SBS thermoplastic elastomer
Properties of white or slightly yellow particles, the relative density of 0.92 ~ 0.95, is a combination of rubber and plastic properties of the toughness of the polymer, at room temperature show rubber elasticity, high temperature and plastic molding of synthetic materials. SBS is divided into star structure and linear structure of two. Such as Y-802, Y-805 grade star structure, can improve the strength and wear resistance; such as Y-792 for the linear structure, can improve the flexibility and elongation at break. SBS has excellent heat aging resistance, ozone resistance, UV resistance, flexion and low temperature resistance, but also has good flexibility and electrical insulation, but poor solvent resistance. Soluble in benzene, cyclohexane, methyl ethyl ketone, dichloroethane and so on. Do not dissolve in water, ethanol and solvent gasoline.
Usage and characteristics This product is used as high-density polyethylene, polypropylene and polystyrene and other impact to improve the agent (add the amount of 5% to 25%, can greatly improve the impact strength at room temperature and low temperature impact strength, also used Acrylic fastener structure of the toughening agent, and for the manufacture of hot melt adhesives, pressure sensitive adhesive and modified asphalt.
6. Nitrile rubber
Properties of a class of random polymers, the average relative molecular mass of about 700,000, the product star gray to light yellow block or powdery solid, the relative density of 0.95 ~ 1.0. (42% ~ 46%), high nitrile (36% ~ 41%), medium high nitrile (31% ~ 35%), nitrile (25%) % ~ 30%), low nitrile (24% or less) five grades and carboxyl nitrile rubber. This product is soluble in ethyl acetate, methyl ethyl ketone and chlorobenzene, with excellent heat resistance, oil resistance, abrasion resistance and air tightness, can be used at 120 ℃ for a long time, isolated from the air at 160 ℃ long-term use The Its properties are affected by the acrylonitrile content. With the increase of the acrylonitrile binding amount, the rubber density, workability, vulcanization speed, strength, abrasion resistance and the mutual compatibility with the polar polymer are improved, but the cold resistance and back Elasticity drop.
Usage and its characteristics This product is used as the impact modifier of polyvinyl chloride, and PVC compatibility is good, the toughness of the hardening of PVC is obvious, the soft polyvinyl chloride non-volatile plasticizer The effect is also used as phenolic resin, epoxy resin and modified acrylic fastener such as fastening agent.
7. Acrylate-acrylonitrile-styrene copolymer
Nature white powder. Relative density of 1.07 ~ 1.09, heat distortion temperature of 80 ~ 85 ℃, long-term use temperature -20 ~ 70 ℃. This product compared with the ABS resin, weather resistance, resistance to ultraviolet light increased by about 10, while the impact strength is not much decline. Resistance to electrical properties, and chemical resistance and other properties similar to ABS resin.
Usage and its characteristics This product is used as a PVC impact modifier for the manufacture of rigid sheet, sheet and so on. Can improve the mechanical properties of polyvinyl chloride, a substantial increase in impact strength.
8. EPDM rubber
Nature of white granules. The relative density of 0.87. Ethylene binding amount of 53% to 72% (mass fraction), diene binding amount of 2.4% to 11.5% (mass fraction). Commodities are 3000 series, 4000 series and other brands, different grades of products, curing speed and processing performance is different. Has excellent strength characteristics and good heat resistance, weatherability, oil resistance, ozone resistance and electrical properties.
Usage and characteristics This product is used as impact modifier for polypropylene and polyethylene, can significantly improve the impact strength, reduce the molding shrinkage, but also for the manufacture of waterproofing membrane, seals, hoses, half of the car parts And sponge materials.
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