A kind of anti-ultraviolet PBT compound and its preparation method and application

Abstract

The invention discloses an anti-ultraviolet PBT compound, its preparation method and application. The PBT compound includes the following components: PBT, glass fiber, lignin, toughening agent, and antioxidant; wherein the average diameter of the glass fiber is less than or equal to 13 μm, and the pH of the lignin is 7.0-8.0. The invention uses safe, efficient and environment-friendly lignin as the ultraviolet absorber of PBT, which replaces the chemical anti-ultraviolet agent commonly used in the market, and the prepared PBT compound containing lignin has good anti-ultraviolet performance. At the same time, the low-diameter glass fiber, toughening agent, etc. cooperate with PBT and lignin to reduce the problem of the decline in the mechanical properties of PBT caused by the addition of lignin. Thus, a PBT composite with both mechanical properties and anti-ultraviolet properties is prepared, the initial tensile strength of the PBT composite is ≥ 100 MPa, and the tensile strength retention rate of the material is ≥ 90% after ultraviolet aging.

Description

technical field [0001] The invention relates to the technical field of engineering plastics, and more specifically, relates to an anti-ultraviolet PBT compound and its preparation method and application. Background technique [0002] As one of the five major engineering plastics, polybutylene terephthalate (PBT) is widely used in various fields, such as electronic appliances, lighting, Appliances and cars etc. For products used outdoors, materials are usually required to have certain UV resistance, but PBT itself has poor UV resistance. Under the action of light and oxygen, PBT will produce physical or chemical changes such as discoloration, surface cracks, hardening, deterioration of electrical properties, and decline in mechanical properties. Among light waves, ultraviolet light (wavelength <400nm) has the greatest destructive effect. [0003] At present, the way to improve the anti-ultraviolet performance of PBT is to add anti-ultraviolet agents, and the most widely ...

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Problems solved by technology

CN101914270A provides a special material for anti-yellowing PBT plastic case of an energy-saving lamp with a cover. The special material for the PBT plastic case includes 0.3-1.5% of a benzotriazole anti-ultraviolet agent to improve the yellowing of the PBT material after being irradiated by ultraviolet rays. But for the mechanical performance of PBT molded case, this prior art does not involve

Alexy (AlexyP, B Kosiková, G Podstránska. The effect of blending lignin with polyethylene and polypropylene on physical properties [J]. Polymer, 2000, 41(13): 4901-4908.) and others found that lignin can improve the properties of polyolefin plastics. Anti-ultraviolet degradation performance, blending lignin with low-density polyethylene (LDPE) and polypropylene (PP) respectively, the study found that when the amount of lignin added is less than 10%, it has little effect on the mechanical properties of PP and LDPE, adding Compared with the material without adding lignin at 5% lignin, the tensile strength of PP decreases by about 4%, and the tensile strength of LDPE decreases by about 2%. When the lignin content exceeds 10%, the mechanical properties of PP and LDPE have a larger drop

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