Method for tackifying recycled polyester bottle flake by using chain extender and application thereof

A technology for polyester bottle flakes and polyester recycling, which is applied in the field of comprehensive utilization of polymer materials, can solve the problems of increased molecular weight of r-PET, high equipment requirements, and high investment costs, and achieves enhanced methods, reduced crystallization enthalpy, and high efficiency. Effect

Inactive Publication Date: 2019-05-14
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, r-PET modification methods are mainly divided into three categories: one is degradation modification, that is, by reducing the molecular weight, r-PET is depolymerized into low molecular weight substances such as terephthalic acid and its esters, and then re-synthesized into PET or made into other materials. products, but this method is complicated and the investment cost is high in industrialization; the second is solid-state polycondensation modification, so that r-PET is assisted by other conditions at a specific temperature, so that the molecular weight is increased, and it can be used as a high-viscosity polyester again, but this The method requires high equipment and generally takes more than 10 hours; the third is chemical chain extension modification, which makes r-PET react with the chain extender to increase the molecular weight of r-PET. This method is easy to operate and the reaction is fast. Modification method with better value

Method used

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  • Method for tackifying recycled polyester bottle flake by using chain extender and application thereof
  • Method for tackifying recycled polyester bottle flake by using chain extender and application thereof
  • Method for tackifying recycled polyester bottle flake by using chain extender and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Using r-PET as the base resin, the torque rheometer is used for melt plasticization, and the chain extender TPP / ADR is added in proportion to the molten r-PET for chemical chain extension reaction. The specific preparation process is as follows:

[0025] Step 1: Clean the r-PET and blow dry it at 80°C for 6 hours, then put it into a high-speed multi-functional pulverizer, grind it for 3 minutes, and dry the fine r-PET particles in vacuum at 80°C for 12 hours. Hour;

[0026] Step 2: Add 100 parts of the processed r-PET particles into the torque rheometer, the temperature is controlled at 250°C, the speed is 40r / min, and the r-PET is fully melted after the torque rheometer runs for 4 minutes , adding a total of 1.65 parts of chain extender TPP / ADR (TPP / ADR is 1.5 parts / 0.15 parts), so that r-PET and the chain extender undergo a chemical chain extension reaction, take it out after 10 minutes, and obtain a high-viscosity polyester;

[0027] The third step: take by weighing...

Embodiment 2

[0029] Using r-PET as the base resin, the torque rheometer is used for melt plasticization, and the chain extender TPP / ADR is added in proportion to the molten r-PET for chemical chain extension reaction. The specific preparation process is as follows:

[0030] Step 1: Clean the r-PET and blow dry it at 80°C for 6 hours, then put it into a high-speed multi-functional pulverizer, grind it for 3 minutes, and dry the fine r-PET particles in vacuum at 80°C for 12 hours. Hour;

[0031] Step 2: Add 100 parts of the processed r-PET particles into the torque rheometer, the temperature is controlled at 250°C, the speed is 40r / min, and the r-PET is fully melted after the torque rheometer runs for 4 minutes , adding a total of 1.75 parts of chain extender TPP / ADR (TPP / ADR is 1.5 parts / 0.25 parts), so that r-PET and the chain extender undergo a chemical chain extension reaction, take it out after 10 minutes, and obtain a high-viscosity polyester;

[0032] The third step: take 0.125g drie...

Embodiment 3

[0034] Using r-PET as the base resin, the torque rheometer is used for melt plasticization, and the chain extender TPP / ADR is added in proportion to the molten r-PET for chemical chain extension reaction. The specific preparation process is as follows:

[0035] Step 1: Clean the r-PET and blow dry it at 80°C for 6 hours, then put it into a high-speed multi-functional pulverizer, grind it for 3 minutes, and dry the fine r-PET particles in vacuum at 80°C for 12 hours. Hour;

[0036] Step 2: Add 100 parts of the processed r-PET particles into the torque rheometer, the temperature is controlled at 250°C, the speed is 40r / min, and the r-PET is fully melted after the torque rheometer runs for 4 minutes , add a total of 2 parts of chain extender TPP / ADR (TPP / ADR is 1.5 / 0.5), make r-PET and chain extender chemical chain extension reaction, take out after 10min, obtain high viscosity polyester;

[0037] The third step: take 0.125g dried high-viscosity polyester with an electronic bala...

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Abstract

The invention provides a method for tackifying recycled polyester bottle flakes by using chain extender and applications thereof and belongs to the field of comprehensive utilization of polymer materials recycling. The method for tackifying recycled the polyester bottle flakes by using the chain extender is characterized in that the recycled polyester flakes as adopted as matrix resin, the chain extender is added thereto for chemical chain extension reaction to obtain high viscosity polyester, and the recycled polyester component is polyethylene terephthalate. The method for tackifying recycled the polyester bottle flakes by using the chain extender has the advantages of effectively improving the intrinsic viscosity of r-PET (recycled polyethylene terephthalate) according to r-PET chain extension reaction mechanism and by selecting the suitable chain extender for compounding, enabling modified high-viscosity polyester material to meet the requirements of engineering plastics, playing an important role in expanding the application range of r-PET products, and providing research basis and practical guiding significance for the industrial production of the r-PET products.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of macromolecular materials, and in particular relates to a method for using a chain extender to increase viscosity and recycle polyester bottle flakes and its application. Background technique [0002] With the continuous development of the plastics industry, the proportion of plastic materials in product packaging has increased rapidly. Polyethylene terephthalate (PET) is a polyester material with good mechanical properties and processing properties, which can be used to produce beverage bottles, packaging bags, films, fibers and other products. According to statistics, the domestic output of bottle-grade polyester in 2014 was 9588kt, and the output in 2017 was about 10323kt. It is estimated that by 2019, the production capacity of bottle-grade polyester in the world will grow at a rate of 5.0%. [0003] PET is mostly consumed as a disposable product in the packaging market, and most co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/692C08L23/12C08L67/02C08L51/06C08K5/134
Inventor 冯钠孟双徐静曲敏杰王书唯王志超雷同
Owner DALIAN POLYTECHNIC UNIVERSITY
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