Polyester full-biodegradable mulch film

Abstract

The invention relates to a mulch film, in particular to a polyester full-biodegradable mulch film. The polyester full-biodegradable mulch film is prepared from the following raw materials in percentage by mass: 40%-80% of flexible degradable polyester, 10%-55% of rigid degradable polyester, 0.5%-1.5% of a reactive compatibilizing agent, 1%-2% of a heat preservation agent, 1%-2% of a moisturizing agent, 0.5%-1.5% of an ageing-resistant agent, 0.5%-1% of a smooth agent and 0.5%-3% of an anti-block agent. The polyester full-biodegradable mulch film does not contain any non-biodegradable general plastic and starch; the film blowing operation can be performed on a general LDPE (low-density polyethylene) film blowing machine; equipment does not need to be modified; the polyester full-biodegradable mulch film is good in transparency, flexibility and heat preservation property, high in strength, low in water vapor penetration rate and favorable for preserving moisture.

Description

technical field [0001] The invention relates to a mulch film, in particular to a completely biodegradable polyester mulch film. Background technique [0002] In the 1960s, mulching technology emerged and became popular in Japan, Europe and the United States and other countries. Since 1979, plastic film mulching cultivation technology has been vigorously promoted in my country. Today, the area covered by plastic film has reached 210 million mu, and the annual consumption exceeds 1.2 million tons. The popularization and application of plastic film, especially for areas with arid and harsh climate conditions, has played a key role in heat preservation and moisture conservation for crops, resulting in a significant increase in crop yield. Plastic film has gradually become an indispensable production material in agriculture. [0003] At the same time, the soil pollution caused by plastic film residues is also becoming more and more serious. Because ordinary plastic film is too t...

AI Technical Summary

Problems solved by technology

[0007] The mulch film reported in CN170395 takes waste cotton, cotton cloth, waste paper, cardboard, etc. as raw materials, and the mulch film mentioned in CN101884292A and CN101712805A uses powdery soil and black humic acid powder as raw materials, and is crushed and kneaded to make and press into mulch film , although the film is completely biodegradable, the production method is difficult, the repeatability is poor, the transparency is poor, the thermal insulation and water retention are poor, and the degradation rate is difficult to control and it is difficult to promote it in a large area

Although CN101565514 and CN102475046A respectively report degradable mulch films made of modified starch or thermoplastic starch, degradable polymer or polyhydrocarbyl fatty acid ester (PHA), the degradable polymer is not further described in the claims, Moreover, the mulch film with starch as the main material also has disadvantages such as poor transparency, poor thermal insulation and water retention, and difficult to control the degradation rate, so it is difficult to popularize.