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In-situ fibril method of recovering waste thermoplastic plastics

A thermoplastic, in-situ microfiber technology, applied in plastic recycling, recycling technology and other directions, can solve the problems of complex recycling process, large equipment investment, environmental pollution and other problems, achieve simple recycling process, low equipment requirements, and wide application field effect

Inactive Publication Date: 2004-01-21
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, some chemical recovery methods, especially the method of chemically cracking waste polymer macromolecules to obtain small molecular compounds, have complicated recovery process, high cost, and low yield; incineration methods not only require large investment in equipment, but also waste resources. And it is only suitable for flammable plastics; directly through the method of crushing, screening and recycling, although simple and applicable, only low value-added products can be produced
In addition, the method of pyrolysis to prepare small molecules and the method of incineration will also emit harmful three waste products, causing environmental pollution

Method used

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  • In-situ fibril method of recovering waste thermoplastic plastics
  • In-situ fibril method of recovering waste thermoplastic plastics
  • In-situ fibril method of recovering waste thermoplastic plastics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～12

[0033] (1) Drying First, the selected thermoplastic waste engineering plastic components after cleaning in Table 1 are dried at 80-120°C for 8-24 hours, and the water content is controlled below 0.01%.

[0034] (2) Initial mixing. Stir and mix the dried and cooled thermoplastic waste engineering plastics and thermoplastic waste general-purpose plastics at room temperature according to the ratio, or add a certain amount of interface modifier and stir and mix evenly at room temperature. If the selected thermoplastic waste engineering Plastics contains polyethylene terephthalate, polybutylene terephthalate, also can add catalyzer, the catalyzer that embodiment 5 and 8 adds is dibutyl tin oxide;

[0035] (3) Melt mixing and extrusion Put the initially mixed material in an extruder with an aspect ratio of 25, a die entrance of 45 degrees, and a flow path length of 10 to 20 mm for melt mixing and extrusion. The barrel temperature is 175-280°C, the die temperature is 260-280°C, and t...

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Abstract

The present invention is in-situ fibrillation method of recovering waste thermoplastic plastics. Washed and dried waste thermoplastic engineering plastics and waste thermoplastic common plastics are mixed in certain ratio; the mixture is molten, extruded and stretched in selected technological conditions; and the stretched material strips are forced cooled in cooling water tank and pelletized to obtain the in-situ reinforced and toughened plastic alloy with excellent comprehensive performance. The said production process has low cost and high production efficiency, solves the environmental pollution caused by waste plastics and utilizes the resource of waste plastics in high additional value.

Description

1. Technical field [0001] The invention belongs to the technical field of recycling waste thermoplastics, and relates to a method for recycling waste thermoplastics by in-situ microfibrillation. 2. Background technology [0002] Plastic is widely used in various industries of the national economy due to its light weight, corrosion resistance, easy processing, low cost, and convenient use. The annual output of plastic products is more than 150 million tons, and it is still increasing at a rate of 10% every year. Since the main component of plastic is a macromolecule with various chemical structures and chain structures, it will age, degrade or cross-link during use, thereby deteriorating its comprehensive performance and becoming waste plastic that cannot be used anymore. As for plastics discarded after use, according to the statistics of the National Environmental Protection Agency and the Ministry of Agriculture, there are more than 50 million tons of disposable packaging ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29B17/00
CPCY02W30/62
Inventor 李忠明杨鸣波黄锐杨伟谢邦互冯建民
Owner SICHUAN UNIV
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