Medium-temperature water-soluble PVA composition for melting, casting and film forming, particles and preparation method thereof

Abstract

The invention belongs to the field of biodegradable materials, and discloses a medium-temperature water-soluble PVA composition for melting, casting and film forming, particles and a preparation method thereof. The medium-temperature water-soluble PVA composition comprises PVA, a plasticizer, a thermal decomposition inhibitor, a thermo-oxidative aging resistant agent, a lubricant, an organic silicon water repellent and a zwitterionic surfactant. Relative to the 100 weight parts 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 antioxidant is 0.5-6 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 2-6parts by weight, the content of the organic silicon water repellent is 0.1-1 part by weight (in terms of solid content), and the content of the zwitterionic surfactant is 0.1-2 parts by weight (in terms of solid content). According to the invention, melt casting film formation of PVA is realized, and the initial water-soluble temperature of the medium-temperature water-soluble PVA particles aftermelt casting film formation is 40 DEG C or above.

Description

technical field [0001] The invention relates to the field of biodegradable materials, in particular to a medium-temperature water-soluble PVA composition formed by melting and casting into a film, particles thereof and a preparation method thereof. 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 under natural conditions, and finally biodegraded into carbon dioxide and water to return 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 processing cost and low production capacity. Melt castin...

AI Technical Summary

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 The melting temperature is similar to the decomposition temperature, the melt fluidity is worse, the melt casting film forming process is more difficult, and there are extremely high requirements for processing equipment

Images