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Preparation method of biodegradable film

A production method and biological technology, applied in the field of biodegradable film production method, can solve the problems of easy rupture of polymer film layer, loss of competitive position of solvent casting film method, difficult removal of polymer film layer, etc., so as to improve the market. value, the effect of reducing production costs

Active Publication Date: 2020-07-10
王洁
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Although the solvent casting method can be applied to thermoplastic and thermosetting polymer materials at the same time; but when the polymer film layer is made by the solvent casting method, it will be affected by the soluble support film and the subsequent crosslinking reaction, causing the prior art to use solvent When the casting film method is used to make the polymer film layer, there are often problems such as the polymer film layer is not easy to peel off from the soluble support film, and the polymer film layer is easy to break, which makes the solvent casting method gradually lose its competitive position. Choose to use extrusion molding or blown bag molding to make general polymer film layers

Method used

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Examples

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preparation example Construction

[0067] "Preparation of Polymer Prepolymer Coating Liquid"

[0068] Before using the solvent casting method to make biodegradable membranes, glycerol and various polyacids were used as raw materials in this experiment, and glycerol was reacted with various polyols to form polyester prepolymers. In order to facilitate the subsequent solvent casting method, in this experiment, an appropriate solvent was selected to be mixed with the polyester prepolymer to adjust the viscosity of the polyester prepolymer to obtain a polymer prepolymer coating solution that can be used in the subsequent process. .

[0069] The specific preparation method of the polymer prepolymer coating solution is exemplified as follows.

preparation example 1 to preparation example 7

[0070] Preparation Example 1 to Preparation Example 7: Polymer prepolymer coating liquid with acetone as solvent

[0071] Preparation Example 1 to Preparation Example 7 are basically the same method as described below to prepare polymer prepolymer coating solution, the difference lies in the types of glycerin and polybasic acid raw materials and the temperature and time parameters controlled in the polymerization reaction.

[0072] In the process, first weigh glycerol and polybasic acid whose molar ratio is 1:1, place it in a 1-liter double-neck flask continuously supplied with nitrogen, and then according to the reaction temperature and time shown in Table 1 below. A prepolymerization reaction is carried out to obtain a high molecular prepolymer. In Preparation Example 1 to Preparation Example 7, the glycerin used can be the above-mentioned technical grade glycerol or reagent grade glycerol, and the polybasic acid can be the above-mentioned adipic acid, sebacic acid, maleic a...

preparation example 8

[0078] Preparation Example 8: Polymer Prepolymer Coating Liquid Using THF as Solvent

[0079] The polymer prepolymer coating solution of Preparation Example 8 is roughly the same as the polymer prepolymer coating solution of Preparation Example 4, except that in Preparation Example 8, THF is used as a solvent to adjust the polymer prepolymer coating solution. The viscosity of the polymer prepolymer obtained in Preparation Example 4 and THF were mixed at a volume ratio of 1:0.25, and placed in an ultrasonic cleaner, heated at 60 ° C and shaken the mixed solution until The polymer prepolymer was completely dissolved in THF; and then stirred with a magnet for 24 hours to ensure that it could be completely dissolved and uniformly dispersed to obtain the polymer prepolymer coating solution of Preparation Example 8 (viscosity about 45000cp).

[0080] "Preparation of Biodegradable Films"

[0081] In order to improve the many problems derived from the previous solvent casting method ...

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Abstract

The invention provides a preparation method of a biodegradable film. The preparation method sequentially comprises the following steps: coating a substrate with a soluble support coating solution, applying a polymer prepolymer coating solution, performing pre-baking, carrying out cross-linking reaction, performing separation and the like. Through the technical means, the biodegradable film can besmoothly separated from the substrate, so that the integrity of the film surface of the prepared biodegradable film is ensured.

Description

technical field [0001] The invention relates to a method for preparing a polymer film layer, in particular to a method for preparing a biodegradable film (biogradable film). Background technique [0002] Biodegradable materials (biogradable materials) are plastic materials that are degradable in nature. They can be metabolized by specific microorganisms and decomposed into carbon dioxide, methane, and water in a buried environment with sufficient humidity, oxygen, and the presence of appropriate microorganisms. Enable biodegradable materials to be transformed and returned to the cycle of nature, reducing the burden of plastic products on the environment. Therefore, with the rising awareness of environmental protection, many scholars and industries have actively invested in the development and research of biodegradable materials in order to achieve the goal of sustainable environmental management and promote the vigorous development of green economy. [0003] The earliest bi...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08G63/12C08G63/52C08L67/00C08L67/06
CPCC08J5/18C08G63/12C08G63/52C08J2367/00C08J2367/06
Inventor 邹尔烨刘大佼王洁
Owner 王洁
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