How to obtain ABS Resin with excellent weatherability

April 17, 2024
blog

Acrylonitrile-butadiene-styrene (ABS) copolymer combines the rigidity of acrylonitrile, the toughness of butadiene, and the processing properties of styrene. This results in a polymer material with outstanding comprehensive performance, making it highly favored in electrical appliances, automobiles, and furniture decoration materials.

Main applications

  • Automotive: ABS and its composites find extensive use in automotive parts such as instrument panels, exterior body panels, interior trim panels, steering wheels, bumpers, and ventilation ducts.
  • Household Appliances: Modified ABS serves as the plastic shell for refrigerators, TV sets, washing machines, air conditioners, computers, copiers, and other electrical appliances.
  • Home Decoration and Building Materials: ABS is utilized in pipes, sanitary ware, and home decoration plates. Additionally, it sees applications in packaging, furniture, sports and recreational goods, and machinery industries.

Common challenges

ABS resin, containing unsaturated C=C double bond structures, is prone to degradation from light, heat, oxygen, and moisture. The unsaturated double bonds, particularly in butadiene, are susceptible to discoloration. Exposure to ultraviolet radiation can significantly reduce the material’s mechanical properties and cause yellowing or fading.

For instance, automotive ABS interior parts, subjected to sunlight and high temperatures, may warp, deform, or discolor if left unmodified. Enhancing the heat resistance and weatherability of ABS materials has become a crucial focus in the plastic industry.

How to improve ABS Resin quality for higher weathering resistance?

Compounding UV absorbers, light stabilizers, and antioxidants with ABS resins effectively prevents or delays photo-aging degradation, thereby extending product lifespan. Choosing the right UV absorber shields the polymer from UV light, preventing photo-oxidative degradation. HALS acts as a free radical trapping agent, capturing radicals generated by polymer oxidation. Antioxidants prevent thermal oxidative degradation during processing and improve material heat resistance.

Recommended solutions

  • Omnistab UV 3030: A recent eco-friendly Cyanoacrylate type UV absorber with high molecular weight, excellent thermal stability, and low volatility.
  • Omnistab UV 326: A traditional Benzotriazole UV absorber with efficient absorption in the 300-400nm band.
  • Omnistab LS 4050: An effective HALS with excellent compatibility with dyes, widely used in ABS home decoration plates.
  • Omnistab LS 770: A general HALS typically used with UV absorbers in most ABS systems.
  • Omnistab AN B 225: A mixture of AN 1010 and AN 168, offering synergistic effects to block chain reactions and eliminate free radicals.

Frequently asked questions

What makes ABS resin prone to degradation, and why is weatherability enhancement important?

ABS resin contains unsaturated double bond structures that make it susceptible to degradation from light, heat, oxygen, and moisture. Enhancing weatherability is crucial to prevent degradation-induced issues such as discoloration, loss of mechanical properties, and reduced lifespan of ABS products.

How do UV absorbers, light stabilizers, and antioxidants improve the weatherability of ABS resin?

UV absorbers shield the polymer from UV light, preventing photo-oxidative degradation. Light stabilizers, such as HALS, trap free radicals generated by polymer oxidation. Antioxidants prevent thermal oxidative degradation during processing and enhance material heat resistance, collectively extending the product’s lifespan.

What are the main challenges faced in enhancing the weatherability of ABS resin for automotive applications?

Automotive ABS interior parts are often exposed to sunlight and high temperatures, leading to issues like warping, deformation, and discoloration. Enhancing the heat resistance and weatherability of ABS materials is crucial to ensure the durability and aesthetics of automotive interior parts.

How do UV absorbers contribute to improving the weatherability of ABS resin?

Omnistab UV 3030, UV 326, and UV 4050H are UV absorbers and HALS stabilizers that effectively shield ABS resin from UV light and prevent photo-oxidative degradation. LS 770 and AN 3052 act as general HALS and prevent gel formation in unsaturated resins, improving ABS stability during processing. ANB225 offers synergistic effects by blocking chain reactions and eliminating free radicals, further enhancing ABS weatherability.

In which industries and applications are ABS resin and its weatherability-enhancing additives commonly used?

ABS resin and its additives find widespread applications in automotive, household appliances, home decoration, building materials, packaging, furniture, sports and recreational goods, and machinery industries. They are used in various products ranging from automotive interior parts to electrical appliances and home decoration materials.

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