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Special polyvinyl alcohol emulsion for protective coating plated with aluminum oxide film as well as preparation method and application of special polyvinyl alcohol emulsion

A technology of polyvinyl alcohol emulsion and polyvinyl alcohol solution, which is applied in coating, sustainable manufacturing/processing, sustainable packaging industry, etc., can solve the problems of film appearance whitening, etc., so as to broaden the application and overcome the problem of white appearance Effect

Pending Publication Date: 2021-07-02
HAINAN BNK WATER BASED NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, Chinese patent CN104354362A involves the use of polyvinyl alcohol as a protective coating. Although this technology has played a certain role in protecting the aluminum oxide film, if the aluminum oxide film made is used for packaging meat products and cooked food, it will be damaged at high temperatures. After cooking and sterilization (121°C, 45min), the appearance of the film will turn white when the polyvinyl alcohol coating encounters hot water, which limits the application of aluminum oxide film to a certain extent.

Method used

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  • Special polyvinyl alcohol emulsion for protective coating plated with aluminum oxide film as well as preparation method and application of special polyvinyl alcohol emulsion
  • Special polyvinyl alcohol emulsion for protective coating plated with aluminum oxide film as well as preparation method and application of special polyvinyl alcohol emulsion
  • Special polyvinyl alcohol emulsion for protective coating plated with aluminum oxide film as well as preparation method and application of special polyvinyl alcohol emulsion

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preparation example Construction

[0051] The present invention also provides a kind of preparation method of the above-mentioned special polyvinyl alcohol emulsion for plating aluminum oxide film protective coating, comprising the following steps:

[0052] A) soft water and polyvinyl alcohol are heated and dissolved to obtain a polyvinyl alcohol solution;

[0053] B) modifying the polyvinyl alcohol solution, kaolin, dispersant and formamide;

[0054] C) performing a crosslinking reaction on the product after the modification reaction in step B), a crosslinking agent and an antifoaming agent to obtain a special polyvinyl alcohol emulsion for protective coating of an aluminum oxide film.

[0055] In the preparation method of the special polyvinyl alcohol emulsion for the aluminum oxide film protective coating, the raw material components and proportions used are the same as above, and will not be repeated here.

[0056] In the invention, soft water and polyvinyl alcohol are heated and dissolved to obtain a poly...

Embodiment 1

[0091] The preparation raw material of polyvinyl alcohol emulsion comprises:

[0092]

[0093] The degree of polymerization of the polyvinyl alcohol is 400, and the degree of alcoholysis is 99%;

[0094] The particle diameter of described kaolin is 20~100nm;

[0095] The dispersant is sodium polyacrylate;

[0096] The crosslinking agent is di-tert-butyl peroxide;

[0097] The defoamer is ethanol.

[0098] Preparation methods include:

[0099] Add soft water and polyvinyl alcohol into the reaction kettle, start stirring at a speed of 150r / min, raise the temperature to 95°C and keep it for 3h to make it completely dissolve; then cool down to 80°C, add kaolin, dispersant and formamide, keep it warm for 1h, After the modification reaction is complete, cool down to 60°C with cooling water, add crosslinking agent and defoamer to carry out crosslinking reaction, and reduce the stirring speed to 50r / min, stir thoroughly for 1 hour, let stand, and cool to room temperature Dischar...

Embodiment 2

[0104] The preparation raw material of polyvinyl alcohol emulsion comprises:

[0105]

[0106] The degree of polymerization of the polyvinyl alcohol is 1900, and the degree of alcoholysis is 88%;

[0107] The particle diameter of described kaolin is 20~100nm;

[0108] Described dispersant is sodium hexametaphosphate;

[0109] The crosslinking agent is di-tert-butyl peroxide;

[0110] The defoamer is isopropanol.

[0111] Preparation methods include:

[0112] Add soft water and polyvinyl alcohol into the reaction kettle, start stirring at a speed of 140r / min, raise the temperature to 93°C and keep it for 3h to make it completely dissolve; then cool down to 75°C, add kaolin, dispersant and formamide, keep it warm for 1h, After the modification reaction is complete, cool down to 50°C with cooling water, add crosslinking agent and defoamer to carry out crosslinking reaction, and reduce the stirring speed to 80r / min, stir thoroughly for 1.5h, let stand, and cool to room temp...

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Abstract

The invention relates to the technical field of high polymer materials, in particular to special polyvinyl alcohol emulsion for a protective coating plated with an aluminum oxide film as well as a preparation method and application of the special polyvinyl alcohol emulsion. The polyvinyl alcohol emulsion is prepared from the following raw materials: 8 wt%-15 wt% of polyvinyl alcohol; 78 wt%-87 wt% of soft water; 3 wt%-5 wt% of kaolin; 0.1 wt%-0.5 wt% of a dispersant; 1 wt%-3 wt% of formamide; 1 wt%-3 wt% of a cross-linking agent; and 0.05 wt%-0.1 wt% of a defoaming agent. The sum of the dosages of the components is 100%. When the polyvinyl alcohol emulsion is used for plating an aluminum oxide film protective coating, all the components in the special polyvinyl alcohol emulsion for plating the aluminum oxide film protective coating have a synergistic effect, and the comprehensive performance of the finally obtained aluminum oxide film is relatively excellent.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a special polyvinyl alcohol emulsion for protective coating of aluminum oxide film, its preparation method and application. Background technique [0002] Aluminum oxide film is one of the high barrier packaging materials in the world at present, with good transparency, excellent oxygen barrier and moisture barrier properties, and its barrier properties will not change under high temperature and high humidity environment, and its adaptability to atmospheric environment is excellent , with microwave penetration and environmental protection, it is widely used in the packaging of food, beverage, meat products, condiments, medicine and other fields. [0003] However, it has been proved by experiments that the aluminum oxide film plated is easy to crack and is easily damaged. In practical applications, it is generally necessary to coat a layer of coating on the aluminum oxid...

Claims

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Application Information

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IPC IPC(8): C09D129/04C09D7/61C09D7/63C09D7/65
CPCC09D129/04C09D7/61C09D7/63C09D7/65C08L33/02C08K3/346C08K5/20C08K5/14Y02W30/80
Inventor 朱清梅袁业兴黄宏存陈招强
Owner HAINAN BNK WATER BASED NEW MATERIAL CO LTD