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A kind of preparation method of water-resistant pva biodegradable film

A technology of biodegradable film and water resistance, which is applied in the field of agricultural film, can solve the problems of PVA film industrial production development limitations, complex extrusion blow molding process, and complex PVA film preparation process, so as to promote the development of industrial production and improve Moisturizing effect, low cost effect

Active Publication Date: 2021-05-18
NEW NAVIGATOR PLASTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solution casting method is relatively simple, but the product quality is not easy to control, the efficiency is low, the energy consumption is high, and the equipment investment is large
Extrusion blow molding process is complex, technically difficult and energy-consuming
[0004] At present, the preparation process of PVA film is relatively complicated, and the processing cost is relatively high, and due to the presence of a large number of hydroxyl groups in PVA film, it is easy to combine with water, which makes the water resistance of the film poor, which limits the actual industrial production and development of PVA film.

Method used

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  • A kind of preparation method of water-resistant pva biodegradable film
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preparation example Construction

[0024] The invention provides a method for preparing a water-resistant PVA biodegradable film, the steps comprising:

[0025] a, prepare PVA aqueous solution with the raw material that comprises small molecule alcohol, PVA, water, crosslinking agent; b, use screw extruder to extrude PVA sheet.

[0026] In some preferred embodiments, the preparation method of a water-resistant PVA biodegradable film, in parts by weight, the steps include:

[0027] S1: Add 80-100 parts of PVA powder, 5-30 parts of small molecule alcohol, 0.1-10 parts of cross-linking agent and 20-300 parts of water into the high-speed mixer, and perform preliminary pre-treatment in the high-speed mixer. Mix to obtain PVA aqueous solution, the preparation temperature is 80°C to 95°C;

[0028] S2: Add 1 to 5 parts of lubricant, 0.1 to 10 parts of heat stabilizer, and 0.1 to 5 parts of sour taste remover to the PVA aqueous solution in sequence, and fully blend them in a high-speed mixer to obtain a mixture , and ...

Embodiment 1

[0073] A preparation method of a water-resistant PVA biodegradable film, in parts by weight, comprising the steps of:

[0074] S1: Add 100 parts of polyvinyl alcohol powder, 5 parts of small molecule alcohol, 0.1 part of borax crosslinking agent and 100 parts of water into a high-speed mixer, and perform preliminary pre-mixing in the high-speed mixer to obtain a PVA aqueous solution , the preparation temperature is 80°C;

[0075] Wherein the degree of polymerization of the polyvinyl alcohol powder is 300, and the degree of alcoholysis is ≥ 98%;

[0076] Wherein the speed of the high-speed mixer described in S1 is 500 rpm;

[0077] Wherein the stirring time of the high-speed mixer described in S1 is 30 minutes;

[0078] Wherein the small molecule alcohol is a mixture of glycerol and pentaerythritol, wherein the weight ratio of glycerol and pentaerythritol is 1.5:1.

[0079] S2: In the PVA aqueous solution, add 3 parts of lubricant, 5 parts of heat stabilizer, and 2 parts of ...

Embodiment 2

[0091] A preparation method of a water-resistant PVA biodegradable film, in parts by weight, comprising the steps of:

[0092]S1: Add 100 parts of polyvinyl alcohol powder, 30 parts of small molecule alcohol, 10 parts of borax crosslinking agent and 100 parts of water into a high-speed mixer, and perform preliminary pre-mixing in the high-speed mixer to obtain a PVA aqueous solution , the preparation temperature is 95°C;

[0093] Wherein the degree of polymerization of the polyvinyl alcohol powder is 2400, and the degree of alcoholysis is ≥ 98%;

[0094] Wherein the speed of the high-speed mixer described in S1 is 800 rpm;

[0095] Wherein the stirring time of the high-speed mixer described in S1 is 90 minutes;

[0096] Wherein the small molecule alcohol is a mixture of glycerol and pentaerythritol, wherein the weight ratio of glycerol and pentaerythritol is 1.5:1.

[0097] S2: In the PVA aqueous solution, add 3 parts of lubricant, 5 parts of heat stabilizer, and 2 parts of...

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Abstract

The invention discloses a method for preparing a water-resistant PVA biodegradable film. The steps include: a. preparing a PVA aqueous solution with raw materials containing small molecule alcohol, PVA, water and a crosslinking agent; b. extruding a PVA sheet using a screw extruder material.

Description

technical field [0001] The invention belongs to the technical field of agricultural membranes, and more specifically, the invention relates to a preparation method of a water-resistant PVA biodegradable membrane. Background technique [0002] Biodegradable plastics are a research hotspot in the field of plastics today. With the introduction of the national "Plastic Restriction Order", the application prospects of biodegradable plastics are even broader. Polyvinyl alcohol (PVA) is a fully biodegradable high molecular polymer, which contains hydroxyl groups in its molecular structure, making it highly crystalline and high barrier. PVA also has good film-forming, cohesive, emulsifying and oil-resistant properties, and the films prepared from it have excellent oxidation resistance, oil resistance, abrasion resistance, tear resistance, transparency, antistatic properties, Printability, chemical resistance, etc., and under certain conditions, it is water-soluble and biodegradabl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L29/04C08K13/02C08K5/053C08K3/38C08K5/098C08J5/18
CPCC08J5/18C08J2329/04C08K5/053C08K5/098C08K13/02C08K2003/387C08K2201/014
Inventor 李颖熙
Owner NEW NAVIGATOR PLASTICS
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