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Multi-component biodegradable mulching film and preparation method thereof

A biodegradable, multi-component technology, applied in the field of multi-component biodegradable plastic film and its preparation, can solve the problems of non-degradable agricultural plastic film, poor processability, difficulty in taking into account comprehensive properties such as strength, toughness and thickness, etc. Good workability, adjustable thickness and high strength

Active Publication Date: 2021-04-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] One of the technical problems to be solved by the present invention is that most of the agricultural mulch films in the prior art do not degrade, although a small part of the mulch films are biodegradable, their processability is not good, and the comprehensive properties such as strength, toughness, and thickness are difficult to balance.

Method used

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  • Multi-component biodegradable mulching film and preparation method thereof
  • Multi-component biodegradable mulching film and preparation method thereof
  • Multi-component biodegradable mulching film and preparation method thereof

Examples

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Effect test

Embodiment 1

[0063] The 1,4-butanedioic acid, terephthalic acid, 1,4-butanediol, tetraisopropyl titanate and pentaerythritol used in the present invention are all CP grade products of Shanghai Sinopharm Chemical Test Co., Ltd. In the reactor of completely removing water and oxygen, 1,4-butanedioic acid and terephthalic acid are respectively accounted for 50% and 50% of the molar ratio of the total diacid charging amount, and 1,4-butanediol is used in the total di The molar ratio of the acid dosage is 105%, and pentaerythritol with 0.25% of the total diacid moles is added, and the catalyst tetraisopropyl titanate is added in an amount of 2 / 10,000 of the total diacid moles. After the feeding is completed, keep stirring under the protection of inert gas, slowly raise the temperature of the reactor from 80°C to 215°C, and keep it at 215°C for about 2.5 hours to ensure that the reaction degree is above 90%, and then use a vacuum pump to pump air and raise the temperature at the same time. Incre...

Embodiment 2

[0065]The starch used in the present invention is the food grade cornstarch produced by COFCO Jilin Company, and the glycerol is the analytically pure glycerin of Shanghai Sinopharm Chemical Test Co., Ltd. A Micro 27 co-rotating twin-screw extruder (screw diameter 27 mm, aspect ratio 40) from Leistritz Company in Germany was used to uniformly melt, mix, plasticize and granulate the two raw materials to produce thermoplastic starch (Thermal Plastic Starch, TPS). The extruder has 11 sections from the feed port to the die, numbered 1-11, and the first section only plays the role of feeding and cannot be heated. The temperatures of sections 2-11 of the extruder are respectively: 60°C, 80°C, 100°C, 120°C, 120°C, 120°C, 120°C, 120°C, 120°C and 120°C, and the screw speed is set at 150rpm. Cornstarch was fed to the first section of the twin-screw extruder with the K-CL-24-KT20 loss-in-weight feeder of the Swiss K-Tron company, and the feeding rate was 7600g / hr. Glycerin is injected i...

Embodiment 3

[0067] The block-type polyhydroxyalkanoate used in the present invention is prepared by biological fermentation, and the specific molecular structure is that 3-hydroxybutyric acid and 4-hydroxybutyric acid are randomly copolymerized and then block-copolymerized with 3-hydroxybutyric acid (bPHA), the weight-average molecular weight is about 500,000, wherein the mass fraction of 4-hydroxybutyric acid is about 18%, the mass fraction of 3-hydroxybutyric acid of block copolymerization is about 50%, and the mass fraction of 3-hydroxybutyric acid of random copolymerization is about 50%. The mass fraction of hydroxybutyric acid is about 32%. The polylactic acid used in the present invention is produced by U.S. NatureWorks company, and the trade mark is 4032D. The compatibilizer used in the present invention is produced by U.S. DuPont Company, and the trade mark is PTW. The chain extender used in the present invention is produced by German BASF company, and the trade mark is 437...

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Abstract

The invention relates to a multi-component biodegradable mulching film and a preparation method thereof, and mainly solves the problems that in the prior art, most of agricultural mulching films are not degraded, although a small part of mulching films are biodegradable, the processability is poor, and the comprehensive properties such as strength, toughness and thickness are difficult to consider at the same time. The invention provides the multi-component biodegradable mulching film, which comprises the following components in parts by weight: (1) 30-80 parts of biodegradable aliphatic aromatic copolyester; (2) 10-40 parts of block polyhydroxyalkanoate; (3) 0-10 parts of polylactic acid; (4) 0-20 parts of thermoplastic starch; (5) 0-10 parts of a compatilizer; (6) 0.1-2 parts of a chain extender; and (7) 0-10 parts of other auxiliary agents; the biodegradable mulching film is characterized in that the parts of polylactic acid and thermoplastic starch in the components are not zero at the same time, the problems in the prior art are well solved, and the biodegradable mulching film can be used for industrial production of biodegradable mulching films.

Description

technical field [0001] The invention relates to a multi-component biodegradable plastic film and a preparation method thereof. [0002] technical background [0003] As an important means of production in agricultural production, plastic film has the functions of increasing soil temperature, preventing water evaporation, improving fertilizer efficiency, and preventing weeds, which can effectively improve agricultural productivity. It has been widely used in my country. According to statistics, the use of plastic film in my country has increased from 6,000 tons in 1982 to 1.44 million tons in 2014, covering an area of ​​more than 18 million hectares. The types of applied crops have gradually developed from economic crops to major food crops. Such as corn, wheat, rice, etc., there is still a lot of room for growth in the application of plastic film in the future. However, with the popularization and application of plastic film mulching technology, it has also brought serious pl...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08L67/04C08L3/02C08K13/02C08K5/098C08K5/20C08K3/38C08J5/18B29B9/06B29C55/28A01G13/02
CPCC08J5/18B29B9/06B29C55/28A01G13/0275C08J2367/02C08J2467/04C08J2403/02C08K13/02C08K5/098C08K5/20C08K2003/385Y02A40/28
Inventor 周炳王洪学王子君贾钦白瑜
Owner CHINA PETROLEUM & CHEM CORP