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Degradable lignin-based composite agricultural mulching film and preparation method thereof

An agricultural mulch, lignin-based technology, applied in the directions of botanical equipment and methods, applications, plant protection covers, etc., can solve problems such as poor mechanical properties of materials

Pending Publication Date: 2021-08-20
EAST CHINA UNIV OF SCI & TECH
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  • Description
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  • Application Information

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Problems solved by technology

[0005] Patent CN201010604201 discloses a lignin-filled polyester composite material and its preparation method. The method is to blend lignin with polyester plastics and extrude and granulate to obtain a lignin-filled polyester composite material. Although the method The content of lignin content can reach 40wt%, but the mechanical properties of the obtained material are relatively poor, and in the case of lignin content of 40wt%, the elongation at break is only 22.59%

Method used

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  • Degradable lignin-based composite agricultural mulching film and preparation method thereof
  • Degradable lignin-based composite agricultural mulching film and preparation method thereof

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preparation example Construction

[0034] Preparation of modified lignin:

[0035] ①Maleic anhydride modified lignin: under the condition of a concentration of 2mol / L sodium hydroxide solution, add 10g of lignin and 10g of maleic anhydride, react in an oil bath at 50°C for 7 hours, add 2mol / L hydrochloric acid to adjust the pH= 2 was precipitated, precipitated by centrifugation, washed 6 times with water, and freeze-dried at -20°C for 48 hours.

[0036] ②Epichlorohydrin modified lignin: under the condition of 2mol / L sodium hydroxide solution, add 10g lignin and 5g epichlorohydrin, react in an oil bath at 70°C for 6 hours, centrifuge to precipitate after the reaction, wash with water After 6 times, freeze-dry at -20°C for 48h.

Embodiment 1

[0038] 1) Pretreatment of raw materials: according to the weight fraction, put 90 parts of raw material PBST and 10 parts of enzymatic lignin in a blast drying oven, and dry at 50-70°C to remove water;

[0039] 2) Pre-mixing of raw materials: 10 parts of enzymatic lignin, 90 parts of PBST, 1 part of erucamide opening agent, 1 part of KH560 coupling agent, 1 part of stearic acid dispersant, dioctyl phthalate plasticizer 1 part, put into the high-speed mixer together, and carry out the mixing operation for 20 minutes at the speed of 2000r / min to obtain the premix;

[0040]3) Extrusion granulation treatment: the premix is ​​added in the twin-screw reaction extruder, the screw reaction extruder is a co-rotating twin-screw extruder, the length-to-diameter ratio of the screw is 25:1, the screw speed is 50rpm, and the temperature in each zone Controlled at: 110°C in zone 1, 120°C in zone 2, 130°C in zone 3, 130°C in zone 4, 130°C in zone 5, 120°C in zone 6, 110°C in zone 7, through t...

Embodiment 2

[0043] 1) Pretreatment of raw materials: according to the weight fraction, put 80 parts of raw materials PBST and 20 parts of alkali lignin in a blast drying oven, and dry at 50-70 ° C to remove water;

[0044] 2) Pre-mixing of raw materials: 20 parts of alkali lignin, 80 parts of PBST, 1 part of erucamide opening agent, 1 part of KH560 coupling agent, 1 part of stearic acid dispersant, dioctyl phthalate plasticizer 1 part, put into the high-speed mixer together, and carry out the mixing operation for 20 minutes at the speed of 2000r / min to obtain the premix;

[0045] 3) Extrusion granulation treatment: the premix is ​​added in the twin-screw reaction extruder, the screw reaction extruder is a co-rotating twin-screw extruder, the length-to-diameter ratio of the screw is 25:1, the screw speed is 50rpm, and the temperature in each zone Controlled at: 110°C in zone 1, 120°C in zone 2, 130°C in zone 3, 130°C in zone 4, 130°C in zone 5, 120°C in zone 6, 110°C in zone 7, through the...

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Abstract

The invention discloses a degradable lignin-based composite agricultural mulching film and a preparation method thereof. The lignin-based composite agricultural mulching film is prepared by blending and casting the following components in parts by weight: 60-95 parts of aliphatic polyester resin, 1-40 parts of modified lignin or lignin, 0.1-1 part of a coupling agent, 0.1-1 part of an anti-blocking agent, 1-5 parts of a plasticizer and 1-3 parts of a dispersant. According to the invention, the lignin is used as a raw material, and the compatibility of the lignin with matrix resin is improved by modifying the raw material lignin; and the prepared mulching film is brown and semitransparent in appearance and smooth and uniform in texture, a degradation period of the mulching film is controlled to be 2-24 months, the mechanical property and degradation property of the mulching film are excellent, and the mulching film is applicable to the fields of agricultural materials, packaging materials, environment-friendly bags, civil greening nets, seed culture belts and the like. The mulching film disclosed by the invention not only has good mechanical properties, but also has warming, soil-moisture-retaining, insect-preventing and weeding effects of and the like, and can be applied to crops such as rice, corn, cotton, sugarcane, vegetables and the like.

Description

technical field [0001] The invention belongs to the field of degradable films, and in particular relates to a bioplastic film modified by blending aliphatic polyester and modified lignin and a preparation method thereof. Especially suitable for agricultural mulch film, packaging materials, etc. Background technique [0002] As one of the most important material resources in agricultural production, plastic film can provide a better growth environment for crop growth. Farmers have greatly improved agricultural output and income by using plastic film mulching cultivation technology, and this technology has also led to major changes in agricultural production methods and productivity. Traditional agricultural mulch is non-degradable. It is used in large quantities, difficult to recycle, and the residual agricultural mulch accumulates year by year, which directly has a serious impact on soil and crops, and leads to serious "white pollution", polluting the agricultural environme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08L67/04C08L97/00C08J5/18A01G13/02
CPCC08J5/18A01G13/0275C08J2367/02C08J2497/00C08J2467/04C08J2467/02
Inventor 张琰何泰枝常随超周鑫
Owner EAST CHINA UNIV OF SCI & TECH
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