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A kind of biodegradable film, its preparation method and the mulch film containing the same

A degradable film and biological technology, applied in the fields of botanical equipment and methods, plant protection, plant protection cover, etc., can solve the problems of inconvenient soil water replenishment process, slow natural degradation rate, and unclean removal of residual film, so as to reduce competitiveness. , The effect of low production cost and labor cost reduction

Active Publication Date: 2022-07-05
湖南萨丰机械科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are some adverse effects in the mulching cultivation of plastic film, such as causing inconvenience to the later soil water replenishment process, and covering the plastic film for many years, the residual film cannot be removed cleanly, causing soil pollution
In addition, the commonly used weeding film in agricultural production has black plastic film with good water retention but poor water permeability and non-woven film with good water permeability but high price and cost. Both of them have slow natural degradation rate and are easy to cause environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The biodegradable film is prepared from the following raw materials: rice husks and polyvinyl alcohol, the thickness of the film is 0.3 mm, and the amount of rice husks per square meter of the film is 150 g.

[0034] The preparation method of the above-mentioned biodegradable film, the method comprises the following steps:

[0035] (1) get rice husk, dry, pulverize, sieve, obtain rice husk powder;

[0036] (2) heating water to 50°C, adding polyvinyl alcohol and stirring, continuing to heat to 80°C and stirring until dissolved, to obtain a polyvinyl alcohol solution, the concentration of which is 8%;

[0037] (3) adding the rice husk powder obtained in the step (1) to the polyvinyl alcohol solution obtained in the step (2), the mass ratio of the rice husk powder and the polyvinyl alcohol solution is 1:25, stirring, Mix evenly to obtain a mixed solution;

[0038] (4) The mixed solution obtained in step (3) is evenly spread on a wire mesh, the aperture of which is 80 mes...

Embodiment 2

[0041] The biodegradable film is prepared from the following raw materials: rice husks and polyvinyl alcohol, the thickness of the film is 1 mm, and the amount of rice husks per square meter of the film is 500 g.

[0042] The preparation method of the above-mentioned biodegradable film, the method comprises the following steps:

[0043] (1) get rice husk, dry, pulverize, sieve, obtain rice husk powder;

[0044] (2) heating water to 40°C, adding polyvinyl alcohol and stirring, continuing to heat to 90°C and stirring until dissolved, to obtain a polyvinyl alcohol solution, the concentration of which is 14%;

[0045] (3) adding the rice husk powder obtained in the step (1) into the polyvinyl alcohol solution obtained in the step (2), the mass ratio of the rice husk powder and the polyvinyl alcohol solution is 1:35, stirring, Mix evenly to obtain a mixed solution;

[0046] (4) Evenly spread the mixed solution obtained in step (3) on a wire mesh with a pore size of 150 meshes, an...

Embodiment 3

[0049] A biodegradable film, the film is prepared from the following raw materials: rice husks and modified polyvinyl alcohol, the modifier of the modified polyvinyl alcohol is epoxy resin, the thickness of the film is 0.7 mm, and the thickness of each square is 0.7 mm. The amount of rice husks in the film is 400g.

[0050] The preparation method of the above-mentioned biodegradable film, the method comprises the following steps:

[0051] (1) take rice husks, dry at 60° C. until the water content in the rice husks is 14.8%, pulverize, and sieve to obtain rice husk powder, and the particle size of the rice husk powder is 0.5 mm;

[0052] (2) Heat water to 45°C, add polyvinyl alcohol and stir, continue heating to 85°C and stir until dissolved, add epoxy resin with 2% by weight of polyvinyl alcohol when it is cooled to 65°C, and keep at 65°C , stirring at a rate of 40 r / min for 2 h to obtain an epoxy resin modified polyvinyl alcohol solution, the concentration of which is 12.5%;...

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Abstract

The biodegradable film provided by the invention uses polyvinyl alcohol and rice husks as raw materials, wherein the rice husks can inhibit the growth of weeds in farmland and reduce the competition ability of weeds, thereby helping crops absorb more nutrients and grow rapidly; Due to the existence of rice husk, the film has shading properties, preventing weeds from photosynthesis and achieving better herbicidal effect; because rice husk is a microporous sheet material, it has certain air permeability, and in the process of film formation, it does not The regularly arranged rice husk fragments are easy to form pores through polyvinyl alcohol glue, so the film provided by the invention has moderate physical properties of air permeability and water permeability, does not affect the necessary oxygen content of the soil and water supply in the later stage, and can effectively Conservation of soil water and fertilizer; the biodegradable film provided by the present invention can begin to degrade in 3-5 months, and finally degrade into organic matter without pollution to the soil, loosen the soil, increase soil fertility, and be green and environmentally friendly.

Description

technical field [0001] The invention belongs to the field of agricultural production, and particularly relates to a biodegradable film, a preparation method thereof and a mulch film comprising the same. Background technique [0002] Plastic film mulching is an agricultural cultivation technology, which has the functions of increasing temperature, retaining water, retaining fertilizer, improving soil physical and chemical properties, improving soil fertility, inhibiting the growth of weeds, reducing diseases, and reducing humidity in the case of continuous rainfall. Thereby promoting plant growth and development, early flowering and fruiting, increasing yield and reducing labor costs. [0003] Because mulching has the effect of warming and moisturizing, it is conducive to the proliferation of soil microorganisms, accelerates the conversion of humus into inorganic salts, and is conducive to crop absorption. According to the determination, after covering with plastic film, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L29/04C08L97/02C08L63/00C08J5/18A01G13/02
CPCA01G13/0275C08J5/18C08J2329/04C08J2497/02C08J2463/00Y02A40/28
Inventor 李畅
Owner 湖南萨丰机械科技有限公司
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