Biodegradable barrier mulch film

A biodegradable, mulching technology, applied in plant protection, plant protection cover, botanical equipment and methods, etc., can solve the problem of lack of high barrier properties, improve tear propagation, balance weather resistance and biodegradability , the effect of simple production process

Active Publication Date: 2018-08-10
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN 1335807 A, CN 102453319 A use biaxial stretching method to produce biodegradable film, the base material is polylactic acid, which is not suitable for polyester film processing, and does not have high barrier property

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. First resin synthesis

[0024] 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

[0032] 1. First resin synthesis

[0033]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 reac...

Embodiment 3

[0041] 1. First resin synthesis

[0042] 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 barrier mulch film. The mulch film is prepared from a first melt and a second melt according to a mode of multi-layer co-extrusion and multi-layer co-blowing ora mode of multi-layered casting and two-way stretching, wherein the second melt forms a barrier layer film as an intermediate layer. The preparation process of the first melt is as follows: first resin, second resin, a complex stabilizer, an anti-blocking agent and an interface compatilizer are mixed and extruded in a screw extruder; and the preparation process of the second melt is as follows: barrier layer resin is extruded in situ through a screw extruder, and then the extruded barrier layer resin is directly mixed and extruded with first resin, second resin, a chemical stabilizer, an interface compatilizer and a composite inorganic salt buffering agent in a screw rod. The biodegradable barrier mulch film provided by the invention has high gas and water vapor barrier property, and improved water retention property; and in addition, through the in-situ reaction of the resin in processing, the weather resistance and biodegradability of the mulching film are balanced, the controllabledegradation of the mulching film is realized, and the mulching film has obvious advantages compared with conventional mulching film.

Description

technical field [0001] The invention relates to the technical field of agricultural films, in particular to a biodegradable barrier film. 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(butylene succi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01G13/02B32B27/08B32B27/20B32B27/28B32B27/36B29C47/00B29C47/06
CPCA01G13/0262B29C48/0018B29C48/08B29C48/21B29L2007/00B29L2009/00B32B27/08B32B27/20B32B27/28B32B27/36B32B2307/412B32B2307/558B32B2307/71B32B2307/714B32B2307/7246Y02A40/28
Inventor 王文俊李家旭邢乾秋来蕾吴林波李伯耿
Owner ZHEJIANG UNIV
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