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Biodegradable mulch and preparation method thereof

A technology of biodegradation and mulching, which is applied in the field of film materials, can solve the problems of difficulty in meeting the requirements of crops with long growth cycles and fast degradation speed, and achieve excellent biodegradability and prolong service life.

Active Publication Date: 2016-05-04
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mulch film has the problem of rapid degradation when it is used, and it will degrade within 75 days of use, which is difficult to meet the use requirements of crops with long growth cycles

Method used

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  • Biodegradable mulch and preparation method thereof
  • Biodegradable mulch and preparation method thereof
  • Biodegradable mulch and preparation method thereof

Examples

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preparation example Construction

[0034] The invention provides a method for preparing a biodegradable mulch film, comprising the following steps:

[0035] The raw materials are sequentially melt-blended, granulated and blow-molded to obtain a biodegradable mulch film;

[0036] The raw materials include 30 to 80 parts by weight of carbon dioxide-propylene oxide copolymer, 18 to 68 parts by weight of poly(butylene adipate-butylene terephthalate), 0.2 to 0.5 parts by weight of Chain agent, 0.1-0.5 parts by weight of antioxidant, 0.4-1 parts by weight of ultraviolet absorber and 0.5-1.5 parts by weight of light stabilizer.

[0037] In the preparation method provided by the invention, the raw materials are first melt-blended and granulated, and the raw materials include carbon dioxide-propylene oxide copolymer, poly(butylene adipate-butylene terephthalate), Chain extenders, antioxidants, UV absorbers and light stabilizers. In the present invention, the content of the carbon dioxide-propylene oxide copolymer in t...

Embodiment 1

[0043] The melt index of 48 parts by weight is poly(butylene adipate-butylene terephthalate) of 3.5g / 10min, the melt index of 50 parts by weight is the carbon dioxide-propylene oxide of 0.5g / 10min Copolymer, 0.3 parts by weight antioxidant 1135, 0.3 parts by weight UV absorber 571, 0.3 parts by weight UV absorber 765, 0.3 parts by weight light stabilizer 944, 0.3 parts by weight light stabilizer 622, 0.3 parts by weight light stabilizer 770 Mix homogeneously with the BASF epoxy chain extender 4370 of 0.2 parts by weight in the mixer, then add the obtained mixture into a twin-screw granulator and granulate to obtain plastic particles; in the granulation process, the twin-screw granulator The temperature in the first zone is 140°C, the temperature in the second zone is 165°C, the temperature in the third zone is 180°C, the temperature in the fourth zone is 190°C, the temperature in the fifth zone is 195°C, the temperature in the sixth zone is 195°C, and the temperature in the sev...

Embodiment 2

[0046] The melt index of 68 parts by weight is the poly(butylene adipate-butylene terephthalate) of 3.0g / 10min, the melt index of 30 parts by weight is the carbon dioxide-propylene oxide of 0.5g / 10min Copolymer, 0.3 parts by weight antioxidant 1135, 0.3 parts by weight UV absorber 571, 0.3 parts by weight UV absorber 765, 0.3 parts by weight light stabilizer 944, 0.3 parts by weight light stabilizer 622, 0.3 parts by weight light stabilizer 770 Mix homogeneously with the BASF epoxy chain extender 4370 of 0.2 parts by weight in the mixer, then add the obtained mixture into a twin-screw granulator and granulate to obtain plastic particles; in the granulation process, the twin-screw granulator The temperature in the first zone is 140°C, the temperature in the second zone is 165°C, the temperature in the third zone is 185°C, the temperature in the fourth zone is 195°C, the temperature in the fifth zone is 195°C, the temperature in the sixth zone is 200°C, and the temperature in the...

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Abstract

The invention belongs to the field of film materials, and in particular relates to a biodegradable mulch and a preparation method thereof. The biodegradable mulch provided by the invention is prepared from the following raw materials in parts by weight: 30-80 parts of a carbon dioxide-epoxypropane copolymer, 18-68 parts of poly(butyleneglycol adipate-butylene terephthalate), 0.2-0.5 part of a chain extender, 0.1-0.5 part of an antioxidant, 0.4-1 part of an ultraviolet absorbent and 0.5-1.5 parts of a light stabilizer. As the carbon dioxide-epoxypropane copolymer, the poly(butyleneglycol adipate-butylene terephthalate), the chain extender, the antioxidant, the ultraviolet absorbent and the light stabilizer are taken as raw materials, due to the synergistic effect of the raw materials, on the premise that excellent biodegradability of the prepared mulch is ensured, the service life of the mulch can be also prolonged.

Description

technical field [0001] The invention belongs to the field of film materials, in particular to a biodegradable film and a preparation method thereof. Background technique [0002] Mulch film has the functions of heat preservation, moisture retention, moisture retention, and fertilization, and can greatly increase crop yields, so it has attracted much attention. At present, plastic film has been widely used. The annual agricultural film usage in my country is about 1.6 million tons. However, traditional plastic film is made of non-biodegradable plastic. Non-biodegradable film does not degrade in soil and is difficult to recycle. [0003] A research report released in 2008 showed that in cotton fields in Xinjiang, the average amount of mulch film residues was 265.3 kg per hectare, and the longer the mulch years, the more serious the pollution. In Xinjiang, the cotton fields that have been mulched continuously for 10, 15 and 20 years have 262 kg / ha, 350 kg / ha, and 430 kg / ha of ...

Claims

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Application Information

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IPC IPC(8): C08L69/00C08L67/02C08K5/00C08K5/134C08K5/3475
CPCC08L67/02C08L69/00C08L2201/06C08L2203/16C08K5/00C08K5/1345C08K5/3475
Inventor 高凤翔蔡毅周庆海王献红张亚明
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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