Nanometer-diatomite-supported crosslinked-starch-modified low-density-polyethylene easily-oxidized degradation mulch film and preparation method thereof

Abstract

The invention relates to the technical field of degradation film materials, and concretely relates to a nanometer-diatomite-supported crosslinked-starch-modified low-density-polyethylene easily-oxidized degradation mulch film and a preparation method thereof. According to the master batch of the mulch film, a combined solution of nanometer diatomite, silica sol and the like is utilized for adsorbing and fixing crosslinked starch, the dried mixed powder is excellent in compatibility with polyethylene after being processed by a silane coupling agent, and thus the disadvantages that a conventional starch-polyethylene degradation film is long in degradation period and insufficient in degradation are improved, the usage amount of crosslinked starch can be increased and the production cost is reduced, doped calcium peroxide is capable of generating oxygen through contact with water in soil and helps to accelerate oxygen degradation of plastic. The mulch film prepared according to the preparation method is good in film forming performance, is capable of retaining water and breathing freely, is beneficial for microbe propagation, helps to improve soil environment, is fast in degradation speed, does not contain toxic or harmful substances, is safe in compositions, and is economical and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of degradable film materials, in particular to a low-density polyethylene oxidatively degradable plastic film modified by nano-diatomite-loaded cross-linked starch and a preparation method thereof. Background technique [0002] Mulch film, as the name implies, is a mulching film, which is used to increase soil temperature, maintain soil moisture, maintain soil structure, prevent pests from invading crops and diseases caused by certain microorganisms, and promote plant growth. At present, mulching technology has been widely used in agriculture. Widely promoted, the effect of increasing production is obvious. Since the mulch film used in large quantities is a non-degradable polymer compound, which is neither eroded by microorganisms nor decomposed by itself, it will inevitably bring pollution hazards that are difficult to solve for future generations in the long run. Therefore, research on degradable mulch ha...

AI Technical Summary

Problems solved by technology

[0003] Starch is an abundant renewable resource in nature. It is non-toxic and harmless, and can be completely biodegraded. However, its poor mechanical properties and waterproof properties limit its application.

At present, some studies modify starch and blend it with synthetic resin or degradable polymer materials to make degradable materials. However, these materials are limited by their mechanical properties, degradation cycle, use environment and processing technology. The usability performance is unsatisfactory