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Controllable biodegradable mulch film

A technology of biodegradation and mulching, which is applied in plant protection, plant protection covers, botanical equipment and methods, etc., can solve the problems of polyester degradation regulation, non-weather resistance modification, short service life, etc. Crack propagation, improved hydrolysis resistance, and improved overall performance

Active Publication Date: 2015-12-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology helps improve the quality of mulches by combining two different chemical components together at once or through specific steps before being applied onto crop plants. It also includes an anti-oxidant component added along with other ingredients like plastic resin binder (PB) for improved durability against environmental factors such as sunlight exposure and moisture. By doing this, these technical improvements help prevent damage caused by rainwater from affecting the nutrients inside the plant's roots while still maintaining good soil retention properties.

Problems solved by technology

This patented technology describes various ways to make durably sized or shaped thermoplastic resin films suitable for applications like disposables. These films require proper treatment before they become unusable due to their poor physical strength and lack of long term stability over multiple uses without excessive waste accumulations. Current solutions either result in incomplete decomposition or harmful reactions when exposed to sunlight or other factors affecting the quality of the final product.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Synthesis of weather-resistant layer resin:

[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 polycond...

Embodiment 2

[0033] 1) Synthesis of weather-resistant layer resin:

[0034] 1.00mol of terephthalic acid, 1.5mol of adipic acid, 3.0mol of 1,4-butanediol, 0.05mol of pentaerythritol and 0.2mol of trimethylolethane are mixed to obtain a slurry, and the slurry is prepared at 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 0.007mol tetrabutyl titanate at 75 ℃ 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...

Embodiment 3

[0042] 1) Synthesis of weather-resistant layer resin:

[0043] Mix 1.00 mol of terephthalic acid, 1.5 mol of adipic acid, 3.0 mol of 1,4-butanediol, 0.5 mol of glycerol and 0.2 mol of sorbitol to obtain a slurry, and transport the slurry to In 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°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 reac...

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Abstract

The invention discloses a controllable biodegradable mulch film. The mulch film is formed by a multi-layer co-extrusion process of a first melt and a second melt and blow molding; a weather-proof-layer film is formed by the first melt, and a stable-layer film is formed by the second melt; the first melt is prepared by the steps of adding weather-proof-layer resin, a compound stabilizer, an anti-blocking agent and an inorganic filler into a mixing machine in sequence, mixing uniformly, then adding the mixture into a screw extruder, and extruding; and the second melt is prepared by the steps of adding stable-layer resin, polylactic acid, a chemical stabilizer and a composite inorganic phosphate buffer agent into the mixing machine in sequence, mixing uniformly, then adding the mixture into the screw extruder, and extruding. According to the controllable biodegradable mulch film provided by the invention, by in-situ reaction of resin in the processing process, weather fastness and biological degradability can be balanced, and the controllable degradation of the mulch film is realized; in addition, the controllable biodegradable mulch film combines the weather fastness and degradation controllability, can meet the demand of the whole growth period of crops, and has obvious advantages compared with the traditional mulch film.

Description

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Owner ZHEJIANG UNIV
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