A biodegradable mulch that can kill weeds

A technology of biodegradation and mulching, which is applied in the direction of weed elimination equipment, plant protection, plant protection cover, etc., can solve the problem of not having the function of weeding, and achieve the improvement of tear propagation, balance of weather resistance and biodegradability, The effect of simple production process

Active Publication Date: 2020-04-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN 1335807 A, CN102453319 A use biaxial stretching method to produce biodegradable film, the base material is polylactic acid, not suitable for polyester film processing, and does not have weeding function

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. First resin synthesis

[0025] Mix 1.00 mol of terephthalic acid, 1.5 mol of adipic acid, 3.0 mol of 1,4-butanediol, 0.05 mol of glycerol and 0.2 mol of pentaerythritol to obtain a slurry. The slurry in the raw material storage tank is continuously transported to the esterification reactor through the raw material transport pipeline, and at the same time, a solution containing 0.007mol tetrabutyl titanate at 75°C is transported from the catalyst pipeline. The internal reaction temperature of the esterification reactor is 230°C, and the atmospheric pressure nitrogen atmosphere collects the esterification water and by-products and the remaining polymerized monomer mixture and the rectification tower container through the pipeline, and keeps the system stable until the esterification rate reaches 90. % or more, reduce the pressure to 100Pa, increase the temperature to 250°C, and continue the reaction for 3 hours. After the end of the melt polycondensation, add the firs...

Embodiment 2

[0035] 1. First resin synthesis

[0036] Mix 1.00 mol of terephthalic acid, 1.5 mol of adipic acid, 3.0 mol of 1,4-butanediol, 0.05 mol of pentaerythritol and 0.2 mol of trimethylolethane to obtain a slurry. The raw material is transported to the raw material storage tank at 70°C, and the slurry in the raw material storage tank is continuously transported to the esterification reactor through the raw material delivery pipeline. At the same time, a solution containing 0.007mol tetrabutyl titanate is transported from the catalyst pipeline . The internal reaction temperature of the esterification reactor is 160°C, and the atmospheric pressure nitrogen atmosphere collects the esterification water and by-products and the remaining polymerized monomer mixture and the rectification tower container through the pipeline, and keeps the system stable until the esterification rate reaches 90. % or more, reduce the pressure to 100Pa, increase the temperature to 250°C, and continue the rea...

Embodiment 3

[0046] 1. First resin synthesis

[0047] The terephthalic acid that is equivalent to 1.00mol, the adipic acid of 1.5mol, the 1,4-butanediol of 3.0mol, the glycerin of 0.5mol and the sorbitol of 0.2mol are mixed to obtain slurry, and slurry is in 70 ℃ to the raw material storage tank, the slurry in the raw material storage tank is continuously transported to the esterification reactor through the raw material delivery pipeline, and at the same time, a solution containing 0.015mol tetrabutyl titanate at 75 ℃ is transported from the catalyst pipeline. The internal reaction temperature of the esterification reactor is 250°C, and the atmospheric pressure nitrogen atmosphere collects the esterification water and by-products and the remaining polymerized monomer mixture and the rectification tower container through the pipeline, and keeps the system stable until the esterification rate reaches 90. % or more, reduce the pressure to 100Pa, increase the temperature to 250°C, and continu...

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Abstract

The invention discloses a biodegradable mulch film capable of weeding. The mulch film is prepared from a first melt and a second melt according to multi-layer coextrusion and multi-layer coblowing ormulti-layer casting and biaxial stretching manners; the preparation process of the first melt is as follows: performing mixing extrusion on first resin, second resin, a compound stabilizer, an antiblocking agent and an interface compatibilizer in a screw extruder; and the preparation process of the second melt is as follows: firstly performing in-situ extrusion on weeding layer resin through a screw extruder, and directly performing mixing extrusion on the obtained resin, first resin, second resin, a chemical stabilizer, an interfacial compatibilizer and a composite inorganic salt buffering agent in a threaded rod. The biodegradable mulch film capable of weeding provided by the invention can make herbicide micro particles released in balance with degradation of the mulch film, and improvesa durable effect of a herbicide; and in addition, through a resin in-situ reaction in the processing process, the weather resistance and biological degradability of the mulch film are balanced, controlled degradation of the mulch film is realized, and the mulch film provided by the invention has obvious advantages compared with a traditional mulch film.

Description

technical field [0001] The invention relates to the technical field of agricultural films, in particular to a biodegradable film capable of weeding. Background technique [0002] According to reports, my country has become the country with the largest area covered by agricultural plastic film and the most types of crops covered. Although covering plastic film has increased farmers' income, the harm it brings is also obvious. Traditional plastic mulches are mostly high-molecular polymers made of polyethylene or polyvinyl chloride. The products are not easy to decompose under natural conditions, and cannot be degraded in the soil for hundreds of years. After years of cumulative use, the mulch film remains in the soil. Causing soil compaction, leading to crop yield decline and environmental pollution and other issues. [0003] Currently available biodegradable materials mainly include polylactic acid (PLA), polyhydroxy fatty acid (PHAs), polybutylene succinate (PBS), poly(but...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01G13/02B32B27/08B32B27/18A01M21/04C08L67/02C08L67/04C08K9/10C08K5/00C08J5/18
CPCA01G13/0275A01M21/043B32B27/08B32B27/18C08J5/18C08J2367/02C08J2467/02C08J2467/04C08K5/00C08K9/10Y02A40/28
Inventor 王文俊李家旭邢乾秋
Owner ZHEJIANG UNIV
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