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Preparation method of fluoride-modified polyvinyl alcohol thin film

A technology of polyvinyl alcohol film and polyvinyl alcohol, which is applied in the direction of biocide-containing paints, coatings, antifouling/underwater coatings, etc., which can solve the problems of difficulty in preventing water vapor penetration, decreased barrier properties, and decreased tensile strength of films, etc. question

Active Publication Date: 2017-06-23
上海佰鑫新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the hydrophobic surface still has a certain degree of wettability, it is difficult to prevent the infiltration of water vapor in a water vapor environment, which will reduce the tensile strength of the film and also reduce the barrier property.

Method used

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  • Preparation method of fluoride-modified polyvinyl alcohol thin film
  • Preparation method of fluoride-modified polyvinyl alcohol thin film
  • Preparation method of fluoride-modified polyvinyl alcohol thin film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～10 and comparative example 1～2

[0065] The preparation steps of fluoride-modified polyvinyl alcohol film are as follows:

[0066] 1) dissolving polyvinyl alcohol (purchased from Shanghai Kaidu Industrial Development Co., Ltd.) into a 7% aqueous solution, and then casting it into a film to prepare a film substrate;

[0067] 2) According to the formulation in Table 1, the surface treatment composition (the ratio of mass and number in the table) comprising fluoride is formulated, wherein Examples 1 to 7 and Comparative Example 1 also contain propionic acid, which accounts for 0.5wt% of hydrolyzable compound, Examples 8-10 and Comparative Example 2 also contain sorbic acid accounting for 0.5wt% of the hydrolyzable compound, and then dissolve the composition in a mixed solvent with a mass ratio of perfluorocyclic ether and butyl acetate of 1:1, and prepare a concentration of 1% solution;

[0068] 3) using a high-pressure spray gun to spray the surface treatment composition solution containing fluoride prepared i...

Embodiment 11～20 and comparative example 3～4

[0073] The preparation steps of fluoride-modified polyvinyl alcohol film are as follows:

[0074] 1) dissolving polyvinyl alcohol (purchased from Shanghai Kaidu Industrial Development Co., Ltd.) into a 7% aqueous solution, and then casting it into a film to prepare a film substrate;

[0075] 2) According to the formula in Table 2, prepare the non-fluorosiloxane compound composition (mass ratio in the table), and then dissolve the composition in butyl acetate and N,N-dimethylformamide with a mass ratio of 1: 1 mixed solvent, prepared into a solution with a concentration of 2%;

[0076] 3) using a high-pressure spray gun to spray the primer solution of the non-fluorosilicone compound composition prepared in 2) on one of the surfaces of the film substrate containing polyvinyl alcohol prepared in 1);

[0077] 4) prepare the surface treatment composition (mass ratio in the table) that comprises fluoride according to the formula in table 2, wherein embodiment 11~17 and comparative ...

Embodiment 4

[0103] The environmental scanning electron microscope of embodiment 4 fluoride modified polyvinyl alcohol film is as figure 1 , 2 shown, from figure 1 It can be seen that the fluoride-modified polyvinyl alcohol film is smooth as a whole, without obvious large particle protrusions; from figure 2 It can be seen that the pattern on the surface of the fluoride-modified polyvinyl alcohol film is relatively smooth without obvious unevenness. Environmental scanning electron microscope of unmodified polyvinyl alcohol film (comparative example 7) such as image 3 , Figure 4 shown, from image 3 It can be seen that the overall surface of the unmodified film is rough with obvious protrusions; from Figure 4 It can be seen that there is a clear fracture surface at the raised edge.

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Abstract

The invention discloses a preparation method of a fluoride-modified polyvinyl alcohol thin film. The preparation method comprises the following steps: spraying a fluoride-containing surface treatment composition onto one surface of a polyvinyl alcohol-containing thin film base material; and spraying a priming coat of a non-fluorosilicone compound composition onto one surface of the polyvinyl alcohol-containing thin film base material. According to the thin film prepared by using the preparation method of the fluoride-modified polyvinyl alcohol thin film, the properties of the polyvinyl alcohol body can be kept through a non-modified surface, the waterproof performance of the modified surface is excellent, and the modified surface is difficultly wetted with water; and the mechanical performance and barrier property of the thin film can still be better kept under water vapor environment.

Description

technical field [0001] The invention relates to a preparation method of a fluoride-modified polyvinyl alcohol film, belonging to the technical field of hydrophobic modification of biodegradable packaging materials. Background technique [0002] Polyvinyl alcohol (poly-(vinyl alcohol), PVA) is a biodegradable, water-soluble synthetic polymer. Because of its biodegradability, water solubility, excellent film-forming properties, cohesive properties, and excellent gas barrier properties, especially the exceptionally excellent barrier properties to oxygen, it has been widely used in the fields of food, medicine, pesticides and industrial packaging materials ; At the same time, it has been approved by the US Department of Agriculture for the packaging of meat and poultry products. [0003] PVA has a strict linear structure, its chemical properties are stable, the hydrogen bonds between molecules make it have sufficient thermal stability, and the hydroxyl groups on the molecular c...

Claims

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Application Information

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IPC IPC(8): C08J7/04C09D127/18C09D5/16C08L29/04
CPCC08J7/0427C08J2329/04C08J2427/18C09D5/1668C09D127/18
Inventor 向德轩向满刘彩艳胡扬剑舒友汤艳
Owner 上海佰鑫新材料科技有限公司
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