High-temperature water-soluble PVA composition capable of being melted and cast into film and particles thereof and preparation method

Abstract

The invention belongs to the field of biodegradable materials, and discloses a high-temperature water-soluble PVA (Polyvinyl Alcohol) composition capable of being melted and cast into a film as well as particles thereof and a preparation method. The high-temperature water-soluble PVA composition comprises PVA, a plasticizer, a thermal decomposition inhibitor, a thermo-oxidative aging resistant agent, a lubricant and a zwitterionic surfactant. Based on 100 parts by weight of PVA, the content of the plasticizer is 15-55 parts by weight, the content of the thermal decomposition inhibitor is 1-8 parts by weight, the content of the thermo-oxidative aging resistant agent is 0.5-6 parts by weight, the content of the lubricant is 2-6 parts by weight, and the content of the zwitterionic surfactantis 0.1-2 parts by weight (in terms of solid content). The high-temperature water-soluble PVA particles capable of being melted and cast into a film provided by the invention realize melting and casting of PVA to form a film.

Description

technical field [0001] The invention relates to the field of biodegradable materials, in particular to a high-temperature water-soluble PVA composition capable of melting and casting into a film, its particles and a preparation method. Background technique [0002] In the field of packaging, plastic is the most widely used packaging material, but with the increasingly serious environmental problems, energy depletion and food safety threats, people are turning their attention to biodegradable materials. Polyvinyl alcohol (PVA) not only has the performance and characteristics of traditional plastics, but also can be split and degraded in water at different water temperatures or under natural conditions, and finally biodegraded into carbon dioxide and water in the form of returning to the natural environment. It is a biodegradable environmentally friendly material . [0003] PVA water-soluble film is mostly produced by solution casting method, which has extremely high processi...

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Problems solved by technology

[0003] PVA water-soluble film is mostly produced by solution casting method, which has extremely high processing cost and low production capacity. Melt casting film forming method using traditional plastic film bag is a processing method with low energy consumption and high production capacity, but due to PVA Its melting temperature is similar to its decomposition temperature, and it is difficult to process melt casting film

Especially the complete alcoholysis type PVA, that is, the PVA raw material with an alcoholysis degree of more than 99%, can produce and process high-temperature (above 80°C) water-soluble PVA film materials, and has a wide range of application scenarios, but because it is easier to decompose and carbonize, the melt Poor fluidity, high requirements on processing equipment

At present, Japan is the only country in the world that has developed high-temperature water-soluble PVA films. The development of high-temperature water-soluble PVA particles or films that can be melt-cast into films in China has not made a breakthrough. They can only be imported from Japan, and the price is high, which limits its use.

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