Thermoplastic starch-polyvinyl alcohol fogging-resistance film and preparation method thereof

Abstract

The invention relates to a thermoplastic starch-polyvinyl alcohol fogging-resistance film which is prepared from the following raw materials in parts by weight: 60 to 70 parts of thermoplastic starch, 40 to 60 parts of polyvinyl alcohol, 25 to 40 parts of compound plasticizer, 5 to 15 parts of cross-linking agent, 5 to 10 parts of antifogging agent, 0.5 to 1 part of titanium dioxide and 1 to 2 parts of other additives; the compound plasticizer is combination of glycerinum, diethanol amine and citric acid, wherein the weight ratio of the lycerinum to the diethanol amine to the citric acid is 1:1:1 to 2:2:1. The thermoplastic starch-polyvinyl alcohol fogging-resistance film provided by the invention has a good antifogging effect, high transparency and excellent water resistance and mechanical property, can be completely biodegraded, can be produced by using a traditional plastics processing equipment, and is simple and easy to process and easy to popularize, and the degradation period is short.

Description

technical field [0001] The invention relates to a film material and a preparation method thereof, in particular to a thermoplastic starch-polyvinyl alcohol anti-fog film and a preparation method thereof. Background technique [0002] Films are widely used in various fields of social life, especially in agriculture, which improves the production environment of crops and is of great significance to the development of agriculture. However, it takes hundreds of years for traditional plastic films to degrade under natural conditions, and they remain in the natural environment for a long time, destroying the metabolism of the natural environment and causing serious damage to the natural environment. Therefore, degradable films have been widely developed and applied. However, compared with traditional films, the existing degradable films still have obvious disadvantages, such as the mechanical properties, water absorption and anti-fog properties of the films. [0003] Starch-base...

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Problems solved by technology

[0012] (2) The number of other biodegradable plastics added is too high, and the cost of biodegradable plastics is relatively high, so this method is not economical and applicable, and is not suitable for promotion, such as patent CN 102408690 A

[0013] (3) The compatibility between thermoplastic starch and the added resin is not good, so the mechanical properties or the performance of the film are not good, such as patent CN 105566823 A, patent CN 104774438 A

[0014] (4) Starch has relatively good water absorption. The products disclosed in the above-mentioned patents do not solve the problems of poor water resistance and anti-fog performance, and the anti-fog film can improve the light transmittance of the film and prolong the effective use time of the film. Poor anti-fog performance will limit the application range of the product

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