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Impact Modifier What Are The Characteristics?
May 10, 2017

Impact Modifier 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, 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. Impact Modifier 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.