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Polyvinyl alcohol water-soluble film and preparation method thereof

A polyvinyl alcohol film and polyvinyl alcohol technology are applied in the field of polyvinyl alcohol water-soluble film and its preparation, and can solve the problems of low production cost, poor weather resistance, low film strength and the like

Inactive Publication Date: 2018-06-29
SINOPEC SICHUAN VINYLON FACTORY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, Chinese patent CN104497456A reports a polyvinyl alcohol water-soluble film, which is prepared by mixing polyvinyl alcohol, glycerin, polyethylene glycol, triethyl citrate and acetaldehyde and then heating up; the polyvinyl alcohol film produced by this patent It can be quickly dissolved in water, which solves the environmental protection problem, avoids the waste of land resources, and effectively relieves the tension of the land. However, the stretchability and acid and alkali resistance of the polyvinyl alcohol film are poor, and its preparation The method requires a special extruder for granulation, the production cycle is long, the technology is difficult, and the product quality stability is poor, which greatly limits its application range
Another example is Chinese Patent CN101367953A, which discloses a production method of water-soluble polyvinyl alcohol film, which dissolves polyvinyl alcohol in water, heats up, defoams, and casts and coats to produce PVA film; this patent has less investment and low production cost. High production efficiency; however, the strength of the prepared film is not high, and the weather resistance is poor, and it cannot be applied to environments with special conditions such as acid and alkali, which greatly limits its application range

Method used

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  • Polyvinyl alcohol water-soluble film and preparation method thereof
  • Polyvinyl alcohol water-soluble film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation of carboxyl modified polyvinyl alcohol:

[0033] (1) Raw material preparation:

[0034] Monomer: Vinyl acetate, 0.7wt% itaconic acid by weight of vinyl acetate to prepare itaconic acid methanol solution with a mass concentration of 10wt%;

[0035] Solvent: methanol accounting for 20wt% of vinyl acetate weight;

[0036] Initiator: Diisopropyl peroxydicarbonate with a mass concentration of 2.0% by weight in methanol solution of diisopropyl peroxydicarbonate accounting for 0.1wt% of vinyl acetate;

[0037] (2) Preparation method:

[0038] Add the above-prepared vinyl acetate monomer, itaconic acid methanol solution and diisopropyl peroxydicarbonate methanol solution into the first polymerizer, where the vinyl acetate and diisopropyl peroxydicarbonate methanol solution are all added, The itaconic acid methanol solution is added to account for 50% of the total weight of the itaconic acid methanol solution, the polymerization temperature is 60±5°C, and the time is 80 minute...

Embodiment 2

[0053] The modified polyvinyl alcohol (polymerization degree of 1800; alcoholysis degree of 98%, containing 1.5 (mol / kg·PVA)-COONa group) prepared in Example 1 was dissolved in water, and the modified polyvinyl alcohol was in an aqueous solution The mass concentration in the medium is 22%, and the modified polyvinyl alcohol aqueous solution is made into a film by a casting method.

Embodiment 3

[0055] Dissolve modified polyvinyl alcohol, ethylene glycol and fumed silica containing 1.0 (mol / kg·PVA)-COONa group with polymerization degree of 1000, alcoholysis degree of 80 (mol)%, and modified polyvinyl alcohol in water. The mass concentration in the aqueous solution is 25%, the mass concentration of ethylene glycol relative to the modified polyvinyl alcohol is about 25%, and the mass concentration of fumed silica relative to the modified polyvinyl alcohol is 0.3%. The polyvinyl alcohol aqueous solution is made into a film by a casting method.

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Abstract

The invention relates to a polyvinyl alcohol film which is prepared by a raw material containing modified polyvinyl alcohol. The modified polyvinyl alcohol has a polymerization degree of 1000-3000 andan alcoholysis degree of 80-99.9 (mol) percent; a modified polyvinyl alcohol molecule contains -COONa group, and the content of the -COONa group is 0.01-3.0 (mol) / kg.PVA. The polyvinyl alcohol film prepared by the invention is good in acid and alkali resistance, good in stretchability and capable of resisting a chloride ion environment, has obvious advantages in the application fields such as packaging of weakly-alkaline liquid detergents, packaging of weakly-acidic or weakly alkaline drugs and packaging of pesticides with chloride ions compared with a conventional polyvinyl alcohol film. Thepolyvinyl alcohol film provided by the invention in simple in preparation method and suitable for industrial production.

Description

Technical field [0001] The invention relates to a polyvinyl alcohol film, in particular to a polyvinyl alcohol water-soluble film and a preparation method thereof. Background technique [0002] Polyvinyl alcohol (PVA) is a water-soluble polymer, which is non-toxic, odorless, and harmless to the human body, and has good affinity with the natural environment. At the same time, it has good compactness, high crystallinity, strong adhesion, and The resulting film is flexible and smooth, oil-resistant, solvent-resistant, abrasion-resistant, gas-permeable, water-soluble and biodegradable, so people are looking forward to it being widely used in agricultural mulch, food packaging and other fields to change The current flood of white pollution. [0003] Regarding the research of polyvinyl alcohol film, domestic and foreign counterparts have made a lot of efforts. For example, Chinese patent CN104497456A reports a water-soluble film of polyvinyl alcohol, which is prepared by mixing polyvin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L29/04C08F8/00C08F218/08C08F222/02
CPCC08F8/00C08F218/08C08J5/18C08J2329/04C08J2429/04C08F222/02Y02W90/10
Inventor 吴刚秦庆伟苟格彭达平郭海奇
Owner SINOPEC SICHUAN VINYLON FACTORY
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