Anti-ultraviolet PBT compound as well as preparation method and application thereof

Abstract

The invention discloses an anti-ultraviolet PBT compound as well as a preparation method and application thereof. The PBT compound comprises the following components: PBT, glass fibers, lignin, a flexibilizer and an antioxidant, wherein the average diameter of the glass fibers is less than or equal to 13 [mu]m, and the pH value of the lignin is 7.0-8.0. According to the preparation method, the safe, efficient and environment-friendly lignin is used as an ultraviolet absorbent of the PBT and replaces a common chemical anti-ultraviolet agent on the market, and the prepared lignin-containing PBTcompound has good anti-ultraviolet performance. Meanwhile, the low-diameter glass fibers, the flexibilizer and the like are matched with the PBT and the lignin, so that the problem that the mechanicalproperty of the PBT is reduced due to the addition of the lignin is reduced. Therefore, the PBT compound with both mechanical properties and ultraviolet resistance is prepared, the initial tensile strength of the PBT compound is greater than or equal to 100 MPa, and after ultraviolet aging, the tensile strength retention rate of a material is greater than or equal to 90%.

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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