AES resin (acrylonitrile-EPDM rubber-styrene copolymer) has excellent weather resistance. Even if it is exposed to outdoor ultraviolet rays, moisture, rain, light and ozone for a long time, it can maintain stable physical properties without coating. It is particularly suitable for direct use outdoors without coating.

Product Overview

The commonly used ABS resin has excellent moldability, impact resistance and glossiness, but because the butadiene rubber used in the synthesis of ABS contains a double bond structure, it is easily decomposed and oxidized by ultraviolet rays, heat energy, etc. When used for a long time in places where weather resistance is required, physical properties will be reduced and discoloration will occur. Although additives can be used to solve this problem, stabilizers have limited effect on the long-term stability of the resin, so the most fundamental way is to use stable rubber without a double bond structure. Resins manufactured using this method include AES, ASA, ACS, etc.

AES is not only a resin with excellent weather resistance, but also has better low-temperature impact resistance than ASA due to the low Tg of EPDM rubber phase. Therefore, it is increasingly used in automotive parts and other plastic products that require long life, safety and reliability. The advantage of not needing to be painted makes AES more competitive in price. In the field of consumer electronics, the weather resistance of AES also means that even after long-term use, the original fresh and bright colors of the products can be better maintained.

Product performance

AES is very stable under sunlight, and its color and physical properties change very little even after being exposed outdoors for a long time

The ABS resin commonly used in AES (physical and chemical properties) has excellent moldability, impact resistance and glossiness. However, due to the double bond structure in the butadiene rubber used in the synthesis of ABS, it is easily decomposed and oxidized by ultraviolet rays, heat energy, etc. When used for a long time in places where weather resistance is required, physical properties will be reduced and discoloration will occur. Although additives can be used to solve this problem, stabilizers have limited effect on the long-term stability of the resin, so the most fundamental solution is to use stable rubber without double bond structure.

Injection molding process

Drying conditions: Dry for at least 3-4 hours at 80~85¡æ (heat-resistant AES: 90-100¡æ); AES materials are hygroscopic and require drying before processing; material humidity should be guaranteed to be less than 0.1%.

Processing temperature: 200~260¡æ, the temperature of heat-resistant AES is increased by 10¡æ, and it is not advisable to stay in the high-temperature barrel for too long (should be less than 30 minutes);

Mold temperature: 40-80¡æ;

Injection pressure: 500~800bar;

Injection speed: medium-high speed;

Screw back pressure: 10-40bar.

Product features

AES resin products are granular, milky white, non-toxic and odorless. Its density is about 1.05g/cm . It has excellent impact resistance, low temperature usability, colorability, oil resistance, insulation and other properties. Its weather resistance is 4 to 8 times that of ABS resin. Its processing performance and surface gloss are similar to those of ABS resin. It can replace ABS resin in some fields with high weather resistance requirements.

Weather resistance

Acrylic wax-ethylene propylene diene rubber-styrene graft copolymer (AES) rubber phase is

ABS resin rubber phase is

The dissociation energy of ¦Á-H on the residual double bond in ABS resin is 163KJ/mol, which has low stability, is prone to substitution reaction, and is easily decomposed by low-energy light, oxygen, and ozone. Or it can be oxidized or cross-linked under heat.

In AES, the rubber phase EPDM rubber main chain has no residual double bonds, and its amino bond dissociation energy is 380KJ/mol. It needs high-energy light to decompose. At present, there is no light with such low wavelength and high energy on the earth. The side chain has a certain reactivity, which has no great effect on the overall performance of the material, making AES have excellent weather resistance and thermal oxygen aging resistance.

Mechanical properties

AES resin has good mechanical properties. Its rubber phase EPDM has a glass transition temperature of -60¡æ, which makes it still have high impact strength at a lower temperature. Under normal circumstances, the tensile strength of AES resin is 35~55MPa, and the notched impact strength is 8~35KJ/m.

Thermal properties

The heat deformation temperature of AES resin is 92¡æ, and the Vicat softening temperature is 95¡æ. The matrix contains a large amount of SAN resin, which will decompose and produce toxic substances when exposed to high temperature for a long time. During processing, it should be noted that the processing temperature should not be too high and the residence time of the material should not be too long. In addition, AES resin is not flame retardant.

Coloring performance

AES resin contains nitrile groups, which are highly polar and easy to dye.

Electrical insulation performance

AES resin has a large volume resistance, and its products have good insulation properties and can be used as electrical housings.

Chemical resistance

AES resin can be dissolved in polar solvents, such as ketones, aldehydes, and chlorinated hydrocarbons. It will soften or swell if left in polar solvents for a long time. It has good corrosion resistance to acids and alkalis. Due to the presence of strong polar groups, it has excellent oil resistance.

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