A processing technology for degrading water seepage farmland cover film and its application

Abstract

The invention discloses a processing technique for degrading water-permeable farmland covering film and its application, belongs to the technical field of agricultural plastic molding, and mainly solves the problems of low longitudinal tear strength and water impermeability of the polyester degradable film. Features: 1 part of potato flour, 1 part of calcium lactate, 50 parts of shell powder and other biological minerals, dried and crushed through a 140-mesh sieve, weighed and mixed to form an affinity water seepage additive; 1 part of the additive is mixed with PPC7 Parts, modified by twin-screw machine, pelletized into affinity water seepage masterbatch. According to PPC:PBAT:Masterbatch=700:300:25 ingredients, set the temperature of each zone of the blow molding machine in sequence at 130-155°C, inflation ratio 3-5:1, blank film thickness 0.007mm±0.003mm, No. 1 on both sides and No. 2 take-up rollers with a gap of 30mm to 35mm, install the segmented steel core polyurethane sand grain rough surface friction floating roller with an outer diameter of 80mm, a length of 80mm to 300mm, and a gap of about 1mm, and wear it on a rod with a gap of 1mm to 2mm, rolling and rolling friction The blank film is formed with a pore length of 20 μm to 200 μm and a pore density of 1 to 2 million pcs / m 2 Fully biodegradable permeable farmland cover film with criss-cross micropores.

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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