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Compostable and degradable mulch film and preparation method thereof

A technology of compost degradation and mulching, which is applied in the direction of climate change adaptation and plant protection cover, can solve the problems of reduced tearing strength, secondary pollution, easy breakage, etc., and achieve the goal of ensuring fertility, short degradation cycle and fast degradation speed Effect

Active Publication Date: 2014-10-22
ANHUI JINGLIANG TONGSHUO PLASTIC FILM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Insufficient: Poor wind and rain resistance, easy to break, tearing strength is greatly reduced after rain, not suitable for mechanical film laying
Photodegradable coatings include additive-type photodegradable mulch and synthetic photodegradable mulch; disadvantages: ①Degradation is greatly restricted by factors such as ultraviolet intensity, geographical environment, seasonal climate, and crop varieties, and the degradation rate is difficult to accurately control; ②The cost is high; ③This kind of mulch can only be degraded under the light, and the part buried in the soil cannot be decomposed because it cannot see the sunlight, which cannot fundamentally solve the soil problem
Disadvantages: Although degrading the mulch into small particles will not have too obvious a negative impact on crop growth in the short term, but as time goes on, the plastic particles in the soil will gradually increase, which is very difficult to remove and may cause more serious problems. Secondary pollution is not conducive to the sustainable development of agriculture

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) By weight percentage, degraded polyester 26%, polyvinyl alcohol 17%, polyhydroxyalkanoate 25%, polybutylene succinate 22%, light stabilizer 2%, black masterbatch 9 % was added to the mixer and stirred for 15 minutes;

[0021] (2) Add the mixture obtained in step (1) into the extruder, adopt a three-layer co-extrusion process, set the speed at 22r / min, and heat-melt extrusion blow molding at a temperature of 110°C to make a film, cut, and thickness The thickness is 15um, the width is 3.5m, and the black mulch film is produced and packaged. The degraded polyester used in the present invention is formed by the copolymerization of 1,4-butanediol, succinic acid, terephthalic acid and ethylene glycol.

Embodiment 2

[0023] (1) By weight percentage, degraded polyester 28%, polyvinyl alcohol 19%, polyhydroxyalkanoate 28%, polybutylene succinate 16%, light stabilizer 2%, black masterbatch 7 % was added to the mixer and stirred for 17 minutes;

[0024] (2) Add the mixture obtained in step (1) into the extruder, adopt a three-layer co-extrusion process, set the speed at 10r / min, and heat-melt extrusion blow molding at a temperature of 130°C to make a film, cut, and thickness The thickness is 15um, the width is 1.35m, and the gray film is produced, the middle is black, and the inner and outer layers are natural colors, just pack it. The degraded polyester used in the present invention is formed by the copolymerization of 1,4-butanediol, succinic acid, terephthalic acid and ethylene glycol.

Embodiment 3

[0026] (1) By weight percentage, degraded polyester 24%, polyvinyl alcohol 14%, polyhydroxyalkanoate 22%, polybutylene succinate 27%, light stabilizer 4%, black masterbatch 9 % was added to the mixer and stirred for 18 minutes;

[0027] (2) Add the mixture obtained in step (1) into the extruder, adopt a three-layer co-extrusion process, set the speed at 15r / min, and heat-melt extrusion blow molding at a temperature of 120°C to make a film, cut, and thickness The thickness is 15um and the width is 3.05m. Black mulch is produced and packaged. The degraded polyester used in the present invention is formed by the copolymerization of 1,4-butanediol, succinic acid, terephthalic acid and ethylene glycol.

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Abstract

The invention relates to the technical field of chemical material, and especially relates to a compostable and degradable mulch film and a preparation method, the compostable and degradable mulch film comprises the following raw materials by weight: 24-28% of degraded polyester, 14-19% of polyvinyl alcohol, 22-28% of polyhydroxyalkanoate, 16-27% of poly butylenes succinate, 2-4% of light stabilizing agent and 7-9% of black master batch. The degradable mulch film has the advantages of fast and complete degradation speed and high intensity. The mulch film has no bubbles, speckles, wrinkles, impurity, pin holes and the like on appearance, and has the advantages of good wearing property and high intensity; degradation period is short and degradation is complete, decomposition is carried out after laminating for about 7 days, then the decomposition speed accelerates, and complete decomposition can be basically carried out about 5 months. Due to fast degradation speed of the mulch film, no pollution is generated on the cultivated land, so that soil structure is not influenced, and the mulch film can help peasant to increase the output and ensure the fertility of soil.

Description

technical field [0001] The invention relates to the technical field of chemical materials, in particular to a compostable and degradable plastic film and a preparation method thereof. Background technique [0002] The mulch film is usually a transparent or black PE film, and there are also green and silver films. Commonly used for ground covering, it has the functions of increasing soil temperature, maintaining soil moisture, maintaining soil structure, preventing pests from invading crops and diseases caused by certain microorganisms, and promoting plant growth. The biodegradable mulch film is a product that can replace the traditional mulch film by using the synergistic, synergistic and coherent effects of the three processes of biodegradation, chemical degradation, and photodegradation, and can achieve degradation and pollution-free. At present, my country has become the country with the largest agricultural film market and usage in the world, and is continuing to develo...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08L29/04C08L67/04B29C47/06A01G13/02
CPCY02A40/28
Inventor 陈利华
Owner ANHUI JINGLIANG TONGSHUO PLASTIC FILM TECH CO LTD