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Liquid mulching film and preparation method thereof

A technology of liquid mulch and oil solution, which is applied in botany equipment and methods, horticulture, plant protection covers, etc., can solve the problems of complicated process, poor film formation, and poor degradation performance of mulch, and achieve good degradation performance, Good moisturizing effect

Active Publication Date: 2016-03-23
中科应化(长春)科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese Patent Publication Nos. CN1088229, CN1445275, CN1114327 propose a kind of liquid mulch film with polyvinyl alcohol as the main raw material, which is characterized in that it is degradable, but its degradation effect is poor and the film-forming property is not good
[0005] Chinese Patent Publication Nos. CN1935878A, CN100443529C propose to use polyvinyl alcohol, starch and acrylic acid to synthesize a degradable liquid film, but its degradability is not complete
The preparation process is complicated, and the degradation performance of the obtained mulch film is also not good.

Method used

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  • Liquid mulching film and preparation method thereof
  • Liquid mulching film and preparation method thereof
  • Liquid mulching film and preparation method thereof

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preparation example Construction

[0049] The present invention provides a method for preparing a liquid mulch film as described in the above technical solution, comprising:

[0050] A) mixing polypropylene carbonate with an oil phase solvent, stirring, mixing with an emulsifier, stirring to obtain an oil solution;

[0051] Mix polyvinyl alcohol and protective agent with water to obtain an aqueous solution;

[0052] B) The aqueous solution is added to the oil solution, mixed with antifreeze, stirred, and emulsified to obtain a liquid mulch film.

[0053] In the invention, polypropylene carbonate is mixed with an oil phase solvent, stirred, mixed with an emulsifier, and stirred to obtain an oil solution.

[0054] In the present invention, firstly, the polypropylene carbonate and the oil phase solvent are mixed and stirred to obtain a mixed solution. The mass ratio of the polypropylene carbonate to the oil phase solvent is (15-30): (25-40); preferably (17-28): (28-38). The mass percentage of the mixed polyprop...

Embodiment 1

[0087] Dissolve 32 grams of PPC (Mn=32,000) in 70 mL of dimethyl carbonate solution, stir at 40°C for 30 minutes at a stirring speed of 400 rpm, add 4 grams of Span 80 and 2 grams of Tween 80 emulsifier, Continue stirring to form an oil solution, dissolve 2.5 grams of polyvinyl alcohol 1788 and 0.5 grams of sodium carboxymethylcellulose in 80 mL of water, slowly add the aqueous solution to the above oil solution under stirring, then add 3 grams of ethylene glycol and continue stirring for 5 Minutes, using a high-speed shearing machine at a speed of 12000rpm to emulsify for 5 minutes, centrifuge at 2500rpm for 30 minutes without stratification, and obtain a liquid mulch film. The liquid mulch can be completely degraded in 270 days. The performance of the prepared mulch is measured by the assay method of the present invention. The results are shown in Table 1. Table 1 shows the properties of the liquid mulch prepared by the embodiments of the present invention and comparative exa...

Embodiment 2

[0089] Dissolve 35 grams of PPC (Mn=53,000) in 50 mL of dimethyl carbonate solution, stir at 50°C for 50 minutes at a stirring speed of 500 rpm, add 5 grams of Tween 80, 3 grams of octadecyltri Methyl ammonium chloride, continue stirring to form an oil solution, dissolve 2 grams of polyvinyl alcohol 1788 and 0.5 grams of sodium carboxymethylcellulose in 60 mL of water, slowly add the aqueous solution to the oil solution, then add 2.5 grams of glycerin and continue stirring After 5 minutes, use a high-speed shearing machine with a speed of 8000rpm to emulsify for 10 minutes, and centrifuge at 2500rpm for 30 minutes without delamination to obtain a liquid mulch film. The liquid mulch can be completely degraded in 280 days. The performance of the prepared mulch is measured by the assay method of the present invention. The results are shown in Table 1. Table 1 shows the properties of the liquid mulch prepared by the embodiments of the present invention and comparative examples. Me...

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Abstract

The invention provides a liquid mulching film, which comprises 15-30wt% of polypropylene carbonate, 1.0-5wt% of polyvinyl alcohol, 2-5wt% of emulsifying agent, 1-3wt% of anti-freezing agent, 0.5-2wt% of protective agent, 25-40wt% of oil-phase solvent, and the balance of water. The liquid mulching film has the advantages that the liquid mulching film is prepared by the polypropylene carbonate under the action of emulsifying agent, and as the polypropylene carbonate is biodegradable aliphatic polyester, the degrading property of the prepared liquid mulching film is good; the heat-insulation and moisture-maintaining properties of the liquid mulching film prepared by the polypropylene carbonate, the polyvinyl alcohol, the emulsifying agent, the anti-freezing agent, the protective agent, the oil-phase solvent and the water are good.

Description

technical field [0001] The invention relates to the technical field of plant protection, in particular to a liquid mulch film and a preparation method thereof. Background technique [0002] Plastic mulching technology has brought great economic benefits to modern agriculture, but with the extensive use of plastic mulch, its negative impact has become increasingly severe. Plastic mulch is difficult to recycle, and a large amount remains in the soil, destroying the soil structure, resulting in crop yield reduction and environmental pollution. At present, plastic film residue has become an urgent problem for human beings to solve. Therefore, the research and development of degradable liquid plastic film that is harmless to the soil and does not need to be recycled meets the needs of environmental protection. [0003] Degradable liquid ecological mulch is a newly developed polymer compound, which can be mixed with water to form a liquid material, which can be sprayed at will to...

Claims

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Application Information

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IPC IPC(8): C08L69/00C08L29/04C08L1/28C08K5/053C08J5/18A01G13/02
CPCA01G13/0275C08J5/18C08J2369/00C08J2429/04C08K2201/014C08L69/00C08L2201/06C08L2203/16C08L2205/03C08L29/04C08L1/286C08K5/053
Inventor 李颖张红明王献红王佛松
Owner 中科应化(长春)科技有限公司
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