Recycling method of waste HIPS

A waste and chain extender technology, applied in recycling technology, plastic recycling, etc., can solve problems such as inappropriate promotion, coking phenomenon, lack of macro performance, etc.

Pending Publication Date: 2020-05-22
广东华越环保科技有限公司 +1
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  • Abstract
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  • Claims
  • Application Information

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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

Method used

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  • Recycling method of waste HIPS
  • Recycling method of waste HIPS
  • Recycling method of waste HIPS

Examples

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Embodiment 1

[0024] The chain extender 2,2'-(1,3-phenylene)-bisoxazoline (PBO) and waste HIPS are added to the twin-screw extruder for blending according to the mass ratio of 1.3:100, and the twin-screw extruder The length-to-diameter ratio of the screw is 40, and the screw is referred to as 450r / min. In the process of melt extrusion, the chain extender reacts with the carboxyl functional group on the molecular chain of the waste HIPS in situ. The temperature control is as follows: T1=180°C, T2=200°C, T3=215°C, T4=230°C, T5=250°C, the speed of the twin-screw extruder is 300r / min, and the residence time in the twin-screw extruder 3-5 minutes, the extruded material is cooled and formed in cold water at 5-30°C, so as to realize the regeneration of waste HIPS.

[0025] The chain extension reaction of PBO and wHIPS is shown in the following formula chain extension one and chain extension two. During the reaction, the oxazoline in the 2,2'-(1,3-phenylene)-bisoxazoline (PBO) structure The ring i...

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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...

Claims

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Application Information

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IPC IPC(8): C08J11/28C08L51/04C08F8/30C08F279/02
CPCC08J11/28C08F8/30C08J2351/04C08F279/02Y02W30/62
Inventor 赵新杨星李沃儿林小庆
Owner 广东华越环保科技有限公司
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