Water-soluble polyester slurry prepared from waste polyester plastics and preparation method thereof

A technology of water-soluble polyester and polyester plastics, applied in fiber types, textiles and papermaking, fiber processing, etc., can solve the problems of complex process, unstable product quality, high production cost, and achieve complex process and processing technology. Complex or uneconomical, easy-to-use effects

Active Publication Date: 2011-01-26
SICHUAN HONGYANG HIGH POLYMER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing water-soluble polyester size is obtained by using monomers as synthetic raw materials, first performing transesterification reaction, and then performing poly

Method used

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  • Water-soluble polyester slurry prepared from waste polyester plastics and preparation method thereof
  • Water-soluble polyester slurry prepared from waste polyester plastics and preparation method thereof
  • Water-soluble polyester slurry prepared from waste polyester plastics and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The method that the present embodiment enumerates utilizes waste and old polyester plastics one-step method to produce water-soluble polyester size, comprises the following steps:

[0051] (1) use the caustic soda solution of 5% of the mass percent concentration of alkali to rinse waste and old polyester plastic fragments;

[0052] (2) Esterify 2kg of ethylene glycol with 350g of isophthalic acid, add 650g of sodium metabisulfite after the reaction, add 3.5g of ternary antimony under nitrogen protection, raise the temperature to 255°C-285°C, and react for 5h -6h to obtain water-based polyester A.

[0053] (3) One-step synthesis of water-soluble polyester:

[0054] Take 1 kg of waste polyester plastic fragments from step (1) and dry them into the reactor, and add 0.7 kg of 1,2-propanediol (PDO), 0.48 kg of diethylene glycol (DEG), water-based polyester modified 0.22kg of agent A, 2g of antimony trioxide, and 0.4g of a composite stabilizer composed of triphenyl phosphat...

Embodiment 2

[0127] The present embodiment utilizes waste polyester plastics one-step method to produce water-soluble polyester slurry with embodiment 1, and the preparation of water-based polyester modifier A used is the same as embodiment 1, wherein in the caustic soda aqueous solution described in step (1) The mass percent concentration of alkali is 8%.

[0128] The consumption of each raw material in the step (3) is: waste polyester 1kg, 1,2-propanediol 0.65kg, diethylene glycol 0.48kg, water-based polyester modifier A 0.18kg, catalyst 2g, composite stabilizer 0.4 g.

[0129] After testing, the appearance of the water-soluble polyester slurry in this example is light yellow, the content is 99%, the pH value is 5, and the melting point is 82°C. It is an anion and can be completely dissolved in hot water at 75°C-85°C. The viscosity was 2.5 mP s, the hygroscopicity (RH=75%) was 6.3%, and the film-forming property was good.

Embodiment 3

[0131] The present embodiment utilizes waste polyester plastics one-step method to produce water-soluble polyester slurry with embodiment 1, and the preparation of water-based polyester modifier A used is the same as embodiment 1, wherein in the caustic soda aqueous solution described in step (1) The mass percent concentration of alkali is 8%.

[0132] The consumption of each raw material in the step (3) is: waste polyester 1kg, 1,2-propanediol 0.8kg, diethylene glycol 0.6kg, water-based polyester modifier A 0.2kg, catalyst 3g, composite stabilizer 0.2 g.

[0133] After testing, the appearance of the water-soluble polyester slurry in this example is light yellow, the content is 99%, the pH value is 6, and the melting point is 82°C. It is an anion and can be completely dissolved in hot water at 75°C-85°C. The viscosity was 2.8 mP s, the hygroscopicity (RH=75%) was 6.5%, and the film-forming property was good.

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Abstract

The invention discloses a method for preparing water-soluble polyester slurry from waste polyester plastics through a one-step method, belonging to the technical field of processing and recycling of waste polyester plastic bottles and pieces. The preparation method comprises the following step of carrying out modification and polycondensation on waste polyester scraps, 1,2-propanediol, diglycol, a waterborne polyester modifying agent A, a composite stabilizing agent and a catalyst in the same reaction kettle so as to ensure that when the polyester slurry is polymerized, a macromolecular main chain not only contains ester groups, but also contains water-soluble groups and is hydrophilic and soluble in water. By adopting an ester exchange polycondensation one-step method to prepare the water-soluble polyester slurry, the invention solves the technical problems of complicated processes, long time, and the like of the traditional two-step method for preparing the water-soluble polyester and has the advantages of low raw material cost, simple and convenient operation, short time and low energy consumption.

Description

technical field [0001] The invention relates to a method for preparing water-soluble polyester slurry by using waste polyester plastics in a one-step process, and belongs to the technical field of processing and recycling of waste polyester plastic bottles and tablets. Background technique [0002] Polyethylene terephthalate (PET) and polytrimethylene terephthalate (PTT) have the characteristics of odorless, tasteless, non-toxic, light weight, high strength, good air tightness and transparency, and are used in food It is widely used in the field of packaging, especially in the packaging of carbonated beverages, mineral water, edible oil and other products, almost all of which use polyester plastic bottles. Waste polyester plastic bottles cannot be degraded spontaneously, if not recycled, it will cause serious environmental pollution and waste of resources. [0003] At present, the recycling of waste polyester plastics PET and PTT at home and abroad is mainly divided into tw...

Claims

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Application Information

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IPC IPC(8): C08G63/688C08G63/86C08K5/523C08K5/521D06M15/507D06M101/32
Inventor 杨建
Owner SICHUAN HONGYANG HIGH POLYMER TECH
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