Processing technology and application of degradable water-seepage farmland mulching film

Abstract

The invention discloses a processing technology and an application of a degradable water-seepage farmland mulching film, belongs to the technical field of agricultural plastic forming and mainly solves the problems of small longitudinal tear strength and no seepage of polyester degradation films. The processing technology is characterized in that 1 part of potato flour, 1 part of calcium lactate,shell powder and 50 parts of biological calcium are selected by weight, dried, sieved by a 140-mesh sieve, weighed and blended into an affine water seepage aid; 1 part of an aid and 7 parts of PPC aresubjected to modification, wiredrawing, water cooling and granulation on a double-screw extruder, and affine water seepage master batch is prepared. Materials are prepared in the ratio of PPC, PBAT and the master batch being 700:300:25; a blowing machine is sequentially set as follows: the temperature of each zone is 130-155 DEG C, the blowup ratio is (3-5):1, the thickness of a base film is 0.007 mm plus or minus 0.002 mm, a group of elastomer sand finish floating rolls with the outer diameter of 80 mm, the length of 80-300 mm and the interval of about 1 mm are mounted on a NO.1 winding rolland a NO.2 winding roll on two sides of a winding machine respectively, wherein the NO.1 winding roll and the NO.2 winding roll are spaced by 30-35 mm, the base film penetrates through rods spaced by1-2 mm and is extruded and rolled by rolling friction, and the criss-cross micro microporous degradable water-seepage farmland mulching film is prepared.

Description

technical field [0001] The invention belongs to the technical field of agricultural plastic molding, and in particular relates to a processing technique for degrading a water seepage farmland covering film and an application thereof. Background technique [0002] The coverage area of ​​PE plastic film in my country has risen to more than 300 million mu in recent years. It is found that there are three major defects in the application of mulch film: one is that residues in the farmland affect the rooting and emergence of crops and cause white pollution in the farmland; It is impossible to seep water, and the precious small rainfall precipitation resources in cold and semi-arid areas cannot be efficiently utilized. In order to reduce the residue of mulch film on farmland by recycling, the country revised the national standard GB / 13735-2017 of mulch film in 2017, and the thickness of mulch film was increased from 0.008mm to 0.01mm as stipulated in GB / 13735-92, which increased ...

AI Technical Summary

Problems solved by technology

It is found that there are three major defects in the application of mulch film: one is that residues in the farmland affect the rooting and emergence of crops and cause white pollution in the farmland; It cannot seep water, and the precious small rainfall precipitation resources in cold and semi-arid areas cannot be efficiently utilized

[0006] PPC is a fully biodegradable polyester material with low cost, high longitudinal strength, and good alkali and microbial degradability, but the film blown alone has high shrinkage, low longitudinal tear strength at right angles, high viscosity, and poor usability. PBAT It is a biodegradable polyester material with high cost, low shrinkage compared with paper, high longitudinal strength, and good acid and microbial degradability, but the film blown alone has high cost, low vertical right-angle tear strength, and poor usability

The common defect of the two polyester linear molecules is that there is no branch chain. When the thickness of the produced degradable plastic film is less than 0.01mm, the longitudinal right-angle tear strength of the film cannot meet the national standard GB / T35975-2017 "Full Biodegradable Agricultural Ground Covering Film" 0.5N standard, the stringing phenomenon is serious in farmland coverage, so the product is difficult to promote and apply in a large area

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