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A kind of degradable plastic and its preparation method

A technology for degrading plastics and plasticizers, applied in the field of plastics preparation, can solve the problems of difficult plastics to degrade, fixed conditions, and inability to degrade well, so as to achieve the effect of avoiding pollution and good degradation

Inactive Publication Date: 2018-01-30
广东三合包装制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is currently difficult to ensure the fixed conditions required for the degradation of plastics. In most cases, these plastics cannot be degraded well due to conditional constraints, whether in the garbage disposal system or in the natural environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] A preparation method of degradable plastics, comprising the steps of:

[0022] (1) Stir and mix each component according to the above ratio to obtain a mixture;

[0023] (2) Put the mixture into the screw injection molding machine for injection molding. During injection molding, the heating temperature of the first stage of the screw is 140-160°C, the heating temperature of the second stage of the screw is 160-180°C, and the heating temperature of the third stage of the screw is 180-200°C, the adding temperature of the die head is 190-220°C.

Embodiment 1

[0025] The degradable plastic is composed of the following components according to the weight ratio range shown: polypropylene resin: 22%, polylactic acid: 59%, starch water retaining agent: 13.9%, pentaerythritol: 3.8%, heat stabilizer: 0.9%, Dibutyl phthalate: 0.4%.

[0026] The degradable plastic is prepared according to the steps of the above preparation method.

Embodiment 2

[0028] The degradable plastic is composed of the following components according to the weight ratio range shown: polypropylene resin: 18%, polylactic acid: 65%, organic polymer water retaining agent: 11%, butyl stearate: 4.3%, thermal Stabilizer: 1.1%, diethyl phthalate: 0.6%.

[0029] The degradable plastic is prepared according to the steps of the above preparation method.

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Abstract

A degradable plastic according to the present invention is characterized in that it is composed of the following components according to the weight ratio range shown: polypropylene resin: 18~25%, polylactic acid: 50~65%, water retaining agent: 10~15% %, lubricant: 0.1‑6%, heat stabilizer: 0.2~1.2%, plasticizer: 0.1~1%. The degradable plastic is added with a water-retaining agent, which can quickly absorb water and make the water penetrate into the polymer matrix, causing the polymer molecular chain to relax, the ester bond begins to hydrolyze initially, the molecular weight decreases, and gradually degrades into oligomers, so that the plastic can undergo rapid Good degradation, avoiding pollution caused by plastic waste, more environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of plastic preparation, in particular to a degradable plastic and a preparation method. Background technique [0002] Plastic is a polymer compound made of a monomer as a raw material through addition polymerization or polycondensation reaction. It is commonly known as plastic or tree. It can freely change its composition and shape. , Colorants and other additives. With the rapid development of my country's economy in recent years, the scale of the plastic industry has also been rapidly expanded, and plastic products have been used in large quantities. However, many disposable plastic wastes that cannot be recycled are produced. Most of these wastes exist in solid forms, including packaging. Bags, beverage bottles, agricultural mulch and other disposable plastic products. These wastes are large in size, take a long time to decompose, and are very difficult to degrade in the natural environment. Therefore, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L23/12C08L3/00C08L101/00C08L1/00C08K5/12C08K5/053
Inventor 罗光勇
Owner 广东三合包装制品有限公司