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Modified polyglycolic acid biodegradable mulch film and preparation method thereof

A polyglycolic acid and biodegradation technology, applied in the fields of botanical equipment and methods, plant protection, plant protection cover, etc., can solve the problems of unfavorable plastic film stability, non-biodegradation, large specific surface area, etc.

Active Publication Date: 2020-10-30
庞买只
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The degradable mulches disclosed in CN103819794A, CN106336567A, CN105001568A and other inventions all contain polyethylene in the material, and polyethylene cannot be biodegraded, so the degradable mulches in the above patents are not completely biodegradable mulches
[0006] CN104109359A, CN106117622A and other inventions disclose degradable mulching films. The material contains polyvinyl alcohol. The main chain of polyvinyl alcohol molecules is a carbon-carbon chain, which is the same as polyethylene and cannot be biodegraded. Risk of dissolution holes, not suitable for use as a mulch
[0007] In CN106221165A, CN106046725A and other inventions, biodegradable plasticizers are respectively added with different contents of plasticizers. Since the plasticizers are very thin and have a large specific surface area, the plasticizers are easy to move out when used in outdoor natural environments, which is not conducive to Mulch stability
Due to the addition of talcum powder or calcium carbonate, the density of the material is further increased, and the cost of the mulch film is increased, which is not conducive to popularization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Using NaOH as a catalyst, 1 part of β-cyclodextrin was cross-linked with 0.1 part of epichlorohydrin at 60° C. for 1.5 hours. When reacting for 1 hour, 1 part of potassium aluminum silicate (4000 mesh) and 5 parts of mesoporous silica (30nm pore size, 6000 mesh) were sequentially introduced to obtain a lightweight modified composite material.

[0044] In turn, 5 parts of lightweight modified composite materials, 15 parts of PGA (melting point 180°C, melting index 5.0), 80 parts of PBST (melting point 115°C, melting index 4.0), 5 parts of PGA-co-BS (melting point 120°C, melting Index 10.0), 0.5 parts of PE-g-GMA (melting point 125 ° C, grafting rate 1.5%), 0.5 parts of dicyclohexylcarbodiimide, 0.1 parts of calcium dodecyl hydroxystearate, 0.5 parts of polysuccinic acid ( Add 4-hydroxy-2,2,6,6-tetramethyl-1-piperidine ethanol) ester and 0.5 part of piroctone into the mixer, mix evenly, add to the twin-screw extruder to extrude Granulation, the obtained particles are the...

Embodiment 2

[0046] Using NaOH as a catalyst, 2 parts of β-cyclodextrin and 0.5 part of epichlorohydrin were cross-linked at 70°C for 2.5 hours. After reacting for 1.2 hours, 2 parts of potassium aluminum silicate (6000 mesh) and 10 parts of mesoporous silica (10nm pore size, 4000 mesh) were sequentially introduced to obtain a lightweight modified composite material.

[0047] In turn, 20 parts of lightweight modified composite materials, 45 parts of PGA (melting point 160°C, melting index 4.0), 40 parts of PBST (melting point 130°C, melting index 5.0), 15 parts of PGA-co-BS (melting point 140°C, melting Index 5.0), 1.5 parts of PE-g-GMA (melting point 105 ° C, grafting rate 0.5%), 1 part of dicyclohexylcarbodiimide, 0.5 parts of zinc dodecyl hydroxystearate, 0.1 parts of polysuccinic acid ( Add 4-hydroxy-2,2,6,6-tetramethyl-1-piperidine ethanol) ester and 1 part of piroctone into the mixer, after mixing evenly, add to the twin-screw extruder to extrude Granulation, the obtained particles ...

Embodiment 3

[0049] Using NaOH as a catalyst, 1.5 parts of β-cyclodextrin and 0.2 parts of epichlorohydrin were cross-linked at 65° C. for 2 hours. When reacting for 1 hour, 1.5 parts of potassium aluminum silicate (5000 mesh) and 8 parts of mesoporous silica (20nm pore size, 5000 mesh) were introduced in sequence to obtain a lightweight modified composite material.

[0050] In turn, 10 parts of lightweight modified composite materials, 25 parts of PGA (melting point 170°C, melting index 3.0), 65 parts of PBST (melting point 120°C, melting index 4.5), 10 parts of PGA-co-BS (melting point 130°C, melting index 7.0), 1 part of PE-g-GMA (melting point 115°C, grafting rate 1%), 0.7 part of N,N'-diisopropylcarbodiimide, 0.3 part of calcium dodecyl hydroxystearate, 0.3 One part of polysuccinic acid (4-hydroxy-2,2,6,6-tetramethyl-1-piperidine ethanol) ester and 0.8 part of piroctone were added to the mixer, and after mixing evenly, they were added to the bis The screw extruder is extruded and gra...

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Abstract

The invention relates to mulch film, in particular to modified polyglycolic acid biodegradable mulch film and a preparation method thereof. The modified polyglycolic acid biodegradable mulch film is made from, by mass, 15-45 parts of polyglycolic acid, 40-80 parts of poly(butylene succinate-co-butylene terephthalate), 5-15 parts of a compatibilizer, 0.5-1.5 parts of a slipping agent, 0.5-1 part ofa hydrolysis-resistant agent, 0.1-0.5 part of an antioxidant, 0.1-0.5 part of an anti-light aging agent, 0.5-1 part of an antibacterial agent, and 5-20 parts of lightweight modified composite, wherein the lightweight modified composite is made from 0.1-0.5 part of epichlorohydrin, 1-2 parts of beta-cyclodextrin, 1-2 parts of potassium aluminum silicate, and 5-10 parts of mesoporous silica. The modified polyglycolic acid biodegradable mulch film has excellent heat-preserving and moisture-holding properties and has significant weight-reducing effect. The preparation method herein is simple andfeasible and is easy to implement.

Description

technical field [0001] The invention relates to a plastic film, in particular to a modified polyglycolic acid biodegradable plastic film and a preparation method thereof. Background technique [0002] The mulch film has a great effect, not only can improve ground temperature, water retention, soil conservation, fertilizer conservation, but also has certain functions such as weeding. In the 1960s, mulching technology emerged in Japan, Europe and the United States and other countries, and gradually became popular. Since 1978, agricultural film covering cultivation technology has been vigorously promoted in my country. In 1980, the area covered by agricultural film was only 25,000 mu. In 2005, the area covered by agricultural film reached 135 million mu. In 2017, the area covered by plastic film reached more than 400 million mu. , the use of mulch film has reached more than 1.5 million tons, and it has become the country with the largest amount of mulch film use in the world. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/02C08L5/16C08L67/04C08L51/06C08K13/04C08K7/26C08K3/34C08K5/098C08J5/18A01G13/02
CPCA01G13/0275C08J5/18C08J2367/02C08J2367/04C08J2405/16C08K3/34C08K5/098C08K7/26C08K13/04
Inventor 庞买只
Owner 庞买只
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