A stretchable organic waste residue-based degradable mulch film and its preparation method

A technology for organic waste and degradable mulch, which is applied to floors, buildings, building structures, etc., can solve the problems of unsuitable mechanical film laying, short degradation cycle and high brittleness of mulch

Active Publication Date: 2017-10-24
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above mulch films have problems such as short degradation cycle, high brittleness, easy breakage, and unsuitable for mechanical film laying, which lead to their seldom used in actual agricultural production.

Method used

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  • A stretchable organic waste residue-based degradable mulch film and its preparation method
  • A stretchable organic waste residue-based degradable mulch film and its preparation method
  • A stretchable organic waste residue-based degradable mulch film and its preparation method

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preparation example Construction

[0050] The second aspect of the present invention relates to a method for preparing a film as described in the first aspect of the present invention, comprising:

[0051] Step A, preparing the organic waste residue pretreatment liquid: mixing the organic waste residue and tap water according to the solid-to-liquid mass ratio of 1:(2-15) to prepare the organic waste residue pretreatment liquid;

[0052] Step B, preparing a mixed liquid of organic waste residue: adding an acid treatment agent and an oxidant to the pretreatment liquid of organic waste residue, and performing stirring treatment to obtain a mixed liquid of organic waste residue;

[0053] Step C, preparing a film-forming mixed slurry: performing an esterification reaction on the organic waste residue mixed solution under stirring conditions to obtain a film-forming mixed slurry;

[0054] Step D, preparing the film: the film-forming mixed slurry is cast into a film.

[0055] According to the present invention, in st...

Embodiment 1

[0096] Weigh 6 kg of cornstarch residue, and use tap water to prepare a waste residue pretreatment solution with a solid-to-liquid mass ratio of 1:2. 0.9 kg of nitric acid, 0.4 kg of oxalic acid, and 0.36 kg of potassium periodate were added thereto, heated and stirred at 70° C. for 90 min, and the stirring speed was 100 rpm. Weigh 0.5 kg of starch and 0.16 kg of polyvinyl alcohol, prepare a binder solution with a solid-to-liquid mass ratio of 1:17 with tap water, and add 0.83 kg of urea thereto. After blending the pretreatment liquid and the binder solution, add 0.12 kg of ferric chloride and 0.12 kg of zinc acetate, heat and stir at 40° C. for 240 min, and the stirring speed is 150 rpm. After the reaction is over, neutralize the feed solution to neutrality with magnesium oxide. The finished film is made by casting method. The electronic universal testing machine was used to measure the tensile properties of the mulch film, and the prepared mulch film was used in the farmla...

Embodiment 2

[0098] Weigh 300 g of penicillin slag, and use tap water to prepare a waste slag pretreatment solution with a solid-to-liquid mass ratio of 1:5. 35 g of citric acid, 100 g of hydrochloric acid, and 13.5 g of peracetic acid were added thereto, heated and stirred at 90° C. for 15 min, and the stirring speed was 315 rpm. Weigh 5 g of chitosan and 10 g of gelatin, prepare a binder solution with a solid-to-liquid mass ratio of 1:20 with tap water, and add 8.75 g of urea and 7 g of glycerin to it. After blending the pretreatment solution and the binder solution, add 4 g of aluminum potassium sulfate and 5 g of zinc sulfate, heat and stir at 100° C. for 180 min, and the stirring speed is 100 rpm. After the reaction is finished, neutralize the feed solution with ammonia water to neutrality, and make a finished plastic film by casting method. Adopt the method identical with embodiment 1 to evaluate product performance, measurement result is shown in Table 1.

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Abstract

The invention relates to a stretchable organic waste slag-based degradable plastic film and a preparation method thereof. The mulch film is prepared from organic waste residue, acid treatment agent, oxidizing agent and optional binder and / or plasticizer, and is optionally subjected to esterification reaction under the condition of an esterification reaction catalyst. The mulch film preparation method of the present invention is simple to operate and has high reaction efficiency. The prepared mulch film has excellent tensile properties, elongation at break (%E) ≥ 120%-250%, and tensile load ≥ 1.3-2.8N, all of which meet the national standard Requirements for the physical and mechanical properties of the mulch film (GB 13735-92); the degradation cycle of the prepared mulch film is stable, and the degradation rate is ≥50%-80% (quality) in 120 days, and the degradation cycle is 180 days-1 year.

Description

technical field [0001] The invention belongs to the technical field of biological materials, and in particular relates to a stretchable organic waste slag-based degradable plastic film and a preparation method thereof. Background technique [0002] Mulching technology is a cultivation technique that protects the growth and development of plant roots by covering the surface of the soil with a plastic film. Because its main function is to protect the root system by protecting the soil temperature and humidity, the film mulching technology is also called root-promoting cultivation technology. Compared with Europe, America and Japan, the use of plastic film mulching technology in my country is relatively late. However, since the agricultural plastic film covering technology was introduced into my country in the 1980s, because of its unique advantages such as heat preservation, moisture retention, fertilizer preservation, and cold protection, coupled with my country's special Geo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L3/02C08L5/08C08L1/28C08L29/04C08L71/02C08L89/00C08L5/04C08L97/02C08K5/053C08K5/20C08K5/21E04F15/10
Inventor 苏海佳马泽峰马彧博秦丽珍谭天伟
Owner BEIJING UNIV OF CHEM TECH
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