Degradable liquid mulching film and production method thereof

Abstract

The invention relates to a degradable liquid mulching film and a production method thereof, particularly to an environment-friendly degradable liquid mulching film with straws as a basic raw material and a production method thereof. The degradable liquid mulching film is prepared from steaming slurry of crop straws (such as wheat straws, rice straws, cotton straws, wood shavings, and the like) or straws paper-making black liquor as a main raw material by a series of reactions, such as sulfonation, crosslinking and copolymerization, of macromolecules in the slurry or the black liquor, such as lignin, cellulose and polysaccharides, under the action of a film formation additive. The macromolecules in the degradable liquid mulching film have a large amount of hydrophilic groups which can effectively catch the water molecules evaporated and diffused from soil to the air, so as to prevent water evaporation and heat loss arising therefrom, thereby increasing the temperature and preserving soil moisture. The degradable liquid mulching film is helpful for increasing crop yield and improving crop quality; and the yield is higher than that by use of a plastic mulching film, and the per mu yield is increased by more than 5%. The degradable liquid mulching film can replace the conventionally used plastic mulching film.

Description

Technical field: [0001] The invention belongs to the new agricultural technology and relates to the field of environmental protection, in particular to a degradable liquid plastic film with straw as the basic raw material and a manufacturing method thereof. Background technique: [0002] Plastic film mulching cultivation technology is an important means of agricultural production. The use of plastic film mulching can meet the needs of crops to increase temperature, preserve moisture, and maintain fertility. It is mainly used for early mulching of crops in northern, arid, and cold regions, as well as wind and sand fixation. Improve quality, early maturity and other functions. [0003] Relevant statistics show that the area of ​​land degradation and desertification in my country increases by 43% annually, with an average annual increase of 2,100 square kilometers of desertified land. At present, more than 80% of the arable land in our country has obstacles such as drought, lo...

AI Technical Summary

Problems solved by technology

[0007] (1) Due to the high price of polyvinyl alcohol, 15,000-20,000 yuan / ton, the usage is relatively large, about 30%, resulting in the cost of the finished degradable mulch film being higher than that of plastic mulch film, which is difficult for the market to accept

[0008] (2) Due to the simple stirring and mixing between the components of the formula, the degree of cross-linking is not high, and the film-forming effect is not ideal; there are few hydrophilic functional groups, and the effect of increasing temperature and moisture retention of the plastic film is not strong. The impact on crop yield, after using the mulch, the crop yield is reduced by more than 5% compared with the yield of using plastic mulch

[0009] (3) According to relevant reports, since polyvinyl alcohol has a -C-C- long chain structure, although there are no plastic fragments left in the soil, the degradation time of the substance in the natural environment is longer than that of polyethylene

[0010] (4) Polyvinyl alcohol destroys the aggregate structure of the plow layer soil to a certain extent, affecting the ability of the soil to retain water and fertilizer

[0011] Therefore, compared with plastic mulch, this type of mulch is not competitive in the market

Images