Recycling method of waste HIPS

Abstract

According to the invention, a novel recycling method is sought from a wHIPS degradation mechanism; and a terminal group with reaction activity, which is produced after wHIPS aging, is utilized and subjected to melting and blending with an active chain extender. The method specifically comprises the following steps: uniformly mixing the chain extender and waste HIPS in a mass ratio of (1-1.6): 100,carrying out heating until the materials are in a molten state, controlling a temperature to be 180-250 DEG C, and allowing the chain extender and carboxyl functional groups on the molecular chains of the waste HIPS to undergo an in-situ chain extension reaction in the process of continuous mixing so as to realize regeneration of the waste HIPS, wherein the chain extender is 1,3-bisdihydrooxazolylbenzene. Molecular chains broken due to aging are connected through a chemical reaction between the chain extender and aging molecules of the waste, so material performance recovery is realized, andrecycled HIPS (namely rHIPS) with excellent comprehensive performance is prepared.

Description

technical field [0001] The invention belongs to the technical field of recycling waste HIPS, in particular to a method for recycling waste HIPS. Background technique [0002] In recent years, with the advancement of science and technology, the electronic and electrical industry has achieved rapid development, and people's lives and production have undergone earth-shaking changes. On the one hand, with the continuous acceleration of technological innovation and the continuous expansion of market demand, the replacement speed of electronic and electrical products is getting faster and faster, and various new electronic and electrical products are overwhelmed; but on the other hand, the accelerated elimination of electronic and electrical products has also led to A large amount of waste electrical and electronic equipment (WEEE) plastics are produced every year in countries all over the world, which has brought great harm to the environment and human health. Therefore, the recy...

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Problems solved by technology

[0004] The current recycling methods of wHIPS mainly include: ① thermal cracking recycling, this method is especially effective for processing plastics that are not suitable for recycling, but the energy consumption in the production process increases, the investment in the early stage equipment increases, and in the production process There may also be coking phenomenon in the substrate, so it is not suitable to be widely promoted; ② Conventional modification and regeneration, by introducing a large number of exogenous high-strength or high-toughness modifiers, to improve the severely deteriorated performance of the substrate

However, due to the excessive lack of macroscopic properties of the waste plastic used as the base material, there is no significant effect when the amount of the modifier is low, and the cost is too high when the amount is high. Therefore, most of the recycled materials produced are oriented towards homogeneity. Serious low-end market

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