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Methylphosphinate-based high-transparency flame-retardant polyvinyl alcohol film and preparation method thereof

A technology of polyvinyl alcohol film and methyl hypophosphorous acid, which is applied in the field of polymer chemistry, can solve the problems of easy change of film properties, lower flame retardant efficiency, unstable film properties, etc., and achieve high transparency retention rate, high resistance High fuel efficiency and high oxygen index

Active Publication Date: 2019-04-09
JIANGHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The flame-retardant PVA materials provided by the above-mentioned patent documents are all opaque, and the additives are inert. They are physically mixed with PVA and do not chemically react with PVA. They are easy to migrate out of the film after encountering water during use, reducing its resistance. fuel efficiency, the properties of the film become unstable
[0004] In the process of realizing the present invention, the inventors have found that there are at least the following problems in the prior art: it is difficult to realize the uniformity of high-efficiency flame-retardant and high transparency for flame-retardant PVA transparent films, and the combination of flame retardants and PVA is not stable enough, so that lead to changes in film properties

Method used

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  • Methylphosphinate-based high-transparency flame-retardant polyvinyl alcohol film and preparation method thereof
  • Methylphosphinate-based high-transparency flame-retardant polyvinyl alcohol film and preparation method thereof
  • Methylphosphinate-based high-transparency flame-retardant polyvinyl alcohol film and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Synthesis of MeHP

[0044] Take 1 mol of methyl dichlorophosphine slowly dropwise into 2 mol of water, react at 50°C for 2 hours, and then remove the generated hydrogen chloride gas under reduced pressure to obtain colorless liquid methyl phosphinic acid MeHP.

[0045] The structure of MeHP is tested by phosphorus nuclear magnetic resonance analyzer, and the results are as follows: figure 1 shown. MeHP 31 Two P resonance shift peaks (25.68 and 22.83ppm) appeared in the P-NMR spectrum. This is because MeHP has two isomers.

[0046] Preparation of PVA aqueous solution

[0047] Polyvinyl alcohol is dissolved in water, and stirred at 95° C. for 5 hours until the PVA is completely dissolved in water to form a transparent aqueous solution with a mass percentage of PVA of 10%.

Embodiment 2

[0049]Take 95g of PVA transparent aqueous solution with a concentration of 10% by mass, add 0.5g of MeHP, and stir mechanically at room temperature for 20min. After mixing evenly, a mixed solution containing MEHP and PVA is obtained, based on the mass sum of MeHP and PVA in the mixed solution , the mass content of MEHP in the mixed solution is 5%. The mixed solution was coated on the substrate, and dried according to the temperature rise program of 50°C / 8hr+100°C / 4hr to obtain a highly transparent flame-retardant PVA film with a film thickness of 200μm.

Embodiment 3

[0051] Get 90g of the PVA transparent aqueous solution with a concentration of 10% by mass, add 1g of MeHP, and mechanically stir for 20min at normal temperature. After mixing evenly, a mixed solution containing MEHP and PVA is obtained. Based on the mass sum of MeHP and PVA in the mixed solution, The mass content of MEHP in the mixed solution is 10%. The mixed solution was coated on the substrate, and dried according to the temperature rise program of 50°C / 8hr+100°C / 4hr to obtain a highly transparent flame-retardant PVA film with a film thickness of 200μm.

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Abstract

The invention discloses a high-transparency flame-retardant polyvinyl alcohol film and a preparation method thereof. The PVA film has excellent flame retarding performance, flame retardant can be stably combined with PVA, and the flame-retardant PVA film has high transparency. The preparation method comprises the following steps: preparing a high-transparency flame-retardant PVA film from a mixedsolution of methylphosphinate and PVA, wherein the mass content of the methylphosphinate in the mixed solution is 1-20 percent, based on the mass sum of the methylphosphinate and PVA in the mixed solution.

Description

technical field [0001] The invention relates to the technical field of polymer chemistry, in particular to a highly transparent flame-retardant polyvinyl alcohol film based on methyl hypophosphorous acid and a preparation method thereof. Background technique [0002] As people's research on composite materials continues to deepen, transparent polymers have shown important application value in the frontier fields of today's material research, such as organic light-emitting diodes, flexible solar cells, wearable smart devices, and aerospace. Polyvinyl alcohol (PVA) is one of the most widely used polymer materials at present. It has excellent light transmission, film-forming properties, gas barrier properties and biodegradability, making it have a good application prospect in electronic materials. However, the PVA material is extremely flammable and has a low oxygen index, which seriously affects its application in the above-mentioned fields. In addition, uncrosslinked PVA is e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08K5/5313C08J5/18
CPCC08J5/18C08J2329/04C08K5/5313
Inventor 刘学清刘志宏高淑玉刘继延邹立勇石红尤庆亮陈佳
Owner JIANGHAN UNIVERSITY
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