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Degradable sludge-based mulching film and preparation method of degradable sludge-based mulching film

A technology for degrading plastic film and sludge, applied in plant protection covers, agriculture, fertilization devices, etc., can solve problems such as failure to achieve the effect of crop heat preservation and moisture preservation, inability to meet the needs of common crop coverage, and rapid degradation of plastic film, etc. Solve environmental pollution and waste of resources, low prices, and the effect of promoting crop growth

Active Publication Date: 2012-07-25
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Patent CN1094960C proposes to use natural organic soil as the main raw material to prepare degradable plastic film. After 1.5 to 2 months, the plastic film can be degraded or plowed into the soil to become organic nutrients. However, the general harvest period of crops is 3 to 6 months. The speed is too fast to meet the coverage needs of common crops throughout the growth period, and it is difficult to promote
[0007] Patent CN1277228A provides a biodegradable black agricultural mulch film that uses asphalt and starch as raw materials, adds micro-fertilizers and herbicides, and sprays on-site spraying. Degradation fails to achieve the effect of heat preservation and moisture retention during the whole growth period of crops, and the raw materials used are all grain and petroleum-based sources, which will greatly increase the cost of film production

Method used

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  • Degradable sludge-based mulching film and preparation method of degradable sludge-based mulching film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Get remaining activated sludge 31g (moisture content 80wt%) and citric acid slag 20g to form sludge aggregate after mixing, take by weighing NaOH according to the amount of sludge aggregate 4wt%, be mixed with solution, put after mixing with sludge aggregate Put it into the Erlenmeyer flask, after stirring for 10min at 80°C and 100rpm, add phosphoric acid to adjust to neutrality, then add 15.5g chitosan and 10g starch to the Erlenmeyer flask as a binder, supplement appropriate amount of water, at 70 Continue heating and stirring at 90 rpm for 2 hours, pour the film-forming mixture slurry in the Erlenmeyer flask onto a glass plate, and form a film by casting method. After the film is dry, dilute the silica sol with a solid content of 6.1g 5 times. , sprayed on the surface of the film for waterproof treatment, that is, a waterproof and degradable film is made. Adopt spiral micrometer to measure the thickness of the plastic film, and carry out the film covering test with t...

Embodiment 2

[0055] Get residual activated sludge 120g (moisture content 80wt%) and bagasse 6.3g to form sludge aggregate after mixing, take by weighing ammoniacal liquor according to the amount of sludge aggregate 12wt%, be mixed with solution, put after mixing with sludge aggregate Put it into the Erlenmeyer flask, after soaking at 10°C for 72h, add acetic acid to adjust to neutrality, then add 8g of ethylene glycol as a plasticizer, 20g of sodium alginate and 24.2g of gelatin as a binder into the Erlenmeyer flask, Add 10g of shredded polyester fiber and 5g of heavy calcium carbonate as membrane support materials, add appropriate amount of water, continue heating and stirring at 30°C and 250rpm for 10h, then add 100ml of hot water to dilute, stir evenly, and spray to form a membrane. After it dries, evenly spray on the surface a silicone acrylic emulsion with a solid content of 11.3g diluted 8 times for waterproof treatment, and use the same method as in Example 1 to evaluate the performa...

Embodiment 3

[0057] Get primary sludge 140g (moisture content 80wt%) and bean curd 9g to form sludge aggregate after mixing, take by weighing calcium hydroxide according to the amount of sludge aggregate 8wt%, be mixed with solution, put after mixing with sludge aggregate Put it into the Erlenmeyer flask, after stirring for 10h at 40°C and 40rpm, add humic acid to adjust to neutrality, then add 1.0g mannitol and 1.0g tributyl citrate as plasticizers to the Erlenmeyer flask, 3.5g Polyvinyl alcohol fiber and 3g talcum powder are used as membrane support materials, 12g polyurethane and 47.6g hydroxyethyl fiber are used as binder, add appropriate amount of water, heat to 60°C, continue to stir for 6h under the condition of 200rpm, put the The film-forming mixture slurry is poured on a glass plate, and film is formed by casting method. After the film is dried, dilute the solid content of 1g acrylate and 0.3g silicon acrylic emulsion 5 times, and spray it on the surface of the film for waterproof...

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Abstract

The invention relates to a degradable sludge-based mulching film and a preparation method of the degradable sludge-based mulching film. The mulching film comprises the main ingredient of sludge aggregate. The preparation method comprises the following steps of: preprocessing the sludge aggregate, and mixing the processed sludge aggregate with materials, such as binding agent, plasticizer and the like to react so as to prepare the agricultural degradable biomass mulching film. The mulching film has low cost and combines with the function of soil moisture conservation, temperature preservation and slow release fertilization, the degradation period meets the covering requirements of the whole growth period of common crops, and the degradable sludge-based mulching film is an agricultural product with a larger market potential.

Description

technical field [0001] The invention belongs to the field of biological materials, and relates to a sludge-based degradable plastic film and a preparation method thereof. Background technique [0002] Mulch film is used for ground covering to increase soil temperature, maintain soil moisture, maintain soil structure, prevent pests from invading crops and diseases caused by certain microorganisms, etc., and has the function of promoting plant growth. In recent years, agricultural mulch has been widely used in agricultural production and cultivation, and has become the third largest agricultural resource after chemical fertilizers and pesticides. At present, the domestic plastic film covers an area of ​​more than 14 million hectares, and the annual consumption is about 440,000 tons, ranking first in the world in both its coverage area and consumption. Experts predict that in 2015, the national plastic film coverage area will expand to more than 20 million hectares. [0003] ...

Claims

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Application Information

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IPC IPC(8): A01G13/02C05G3/00
Inventor 苏海佳敖李龙康虎谭天伟
Owner BEIJING UNIV OF CHEM TECH
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