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Biodegradable material and biodegradable mulching film

A biodegradable material and biodegradable technology, applied in the field of biodegradable materials, can solve problems such as fragile, persistent pollution, and difficult to eliminate

Active Publication Date: 2017-08-11
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Most of the mulch films currently used are polyethylene or polyvinyl chloride film plastics, which are extremely difficult to degrade. They are neither eroded by microorganisms nor decomposed by themselves. The degradation cycle is generally 200 to 300 years, and toxic substances will be dissolved during the degradation process. And fragile, not easy to remove
In addition, the recovery rate is low (less than 1 / 3), and a large amount of residues accumulate in the soil, causing persistent pollution
Therefore, if the problem of residual plastic film cannot be effectively solved, it will inevitably bring unsolvable pollution hazards to future generations and pose a serious threat to the sustainable development of agriculture.

Method used

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  • Biodegradable material and biodegradable mulching film
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  • Biodegradable material and biodegradable mulching film

Examples

Experimental program
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preparation example Construction

[0032] In the present invention, the preparation method of described polyester plasticizer comprises the following steps:

[0033] Dibasic acid and dibasic alcohol are mixed, melted, and mixed with glycerol to obtain polyester plasticizer.

[0034] In the present invention, the ratio of the substance amount of the dibasic acid to the dibasic alcohol is preferably 1:1.2 to 1.5; The ratio is preferably 1 to 5:100.

[0035] The present invention heats dibasic acid and dibasic alcohol to a molten state, and then adds glycerol when they are viscous. In the present invention, the time for the mixed reaction with glycerol is preferably 25-35 minutes, more preferably 30 minutes.

[0036] The biodegradable material provided by the invention includes 0.5-15 parts of a cross-linking agent. In the present invention, the crosslinking agent can react with the terminal hydroxyl groups and carboxyl groups of the PLA resin and the polyester plasticizer. When the two ends of the crosslinking...

Embodiment 1

[0071] 50wt% polylactic acid A (number average molecular weight 5×10 4 g / mol), 35wt% polyester plasticizer 1 and 15wt% toluene diisocyanate (TDI) prepared above were mixed in a high mixer for 10 minutes, then added to a twin-screw extruder, extruded and granulated at 150°C , to obtain modified polylactic acid resin particles; the modified resin was blow molded in a film blowing machine at 140°C to obtain a biodegradable mulch film with a film thickness of about 12 μm.

[0072] The above-mentioned biodegradable mulch film and the PE mulch film as a comparison were laid on the spot under the same conditions for 70 days, and the changes in the mechanical properties of the film materials before and after laying were compared. The results are shown in Table 1:

[0073] Table 1 Changes in mechanical properties of PE film, comparative examples and biodegradable mulch films prepared in Examples 1-8

[0074]

[0075] It can be seen from Table 1 that the plasticized biodegradable bi...

Embodiment 2

[0077] Polylactic acid 90wt%A (number average molecular weight 5×10 5 g / mol), 5wt% polyester plasticizer 2 and 5wt% diphenylmethane diisocyanate (MDI) prepared above were mixed in a high mixer for 10 minutes, then added to a twin-screw extruder, and extruded at 220°C Pelletize to obtain modified polylactic acid resin particles; blow mold the modified resin in a film blowing machine at 170°C to obtain a biodegradable mulch film with a film thickness of about 12 μm.

[0078] The above-mentioned biodegradable plastic film was laid on the ground for 70 days, and the mechanical properties of the film material were compared before and after laying. The results are shown in Table 1.

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Abstract

The invention provides a biodegradable material and a biodegradable mulching film. The biodegradable material is prepared from, by weight, 50-90 parts of polylactic acid, 5-50 parts of a polyester plasticity agent and 0.5-15 parts of a cross-linking agent. The polyester plasticity agent is prepared from diprotic acid, dihydric alcohol and trihydric alcohol in a copolymerization manner. The biodegradable material comprises the polyester plasticity agent which is prepared from the diprotic acid, the dihydric alcohol and the trihydric alcohol in the copolymerization manner and the cross-linking agent, the polyester plasticity agent interacts with the cross-linking agent, and the prepared biodegradable mulching film has biodegradability as well as high strength and ductility; and melt stability is good. An experiment result shows that compared with the prior art, the biodegradable mulching film has high strength and ductility; after the biodegradable mulching film is used for 70 days, the basic mechanical property of the biodegradable mulching film can still be 50% or above; and the biodegradable mulching film is decomposed into environmental-friendly micromolecules within 3-6 months.

Description

technical field [0001] The invention relates to the technical field of biodegradable materials, in particular to a biodegradable material and a biodegradable mulch. Background technique [0002] Plastic film mulching technology has been widely promoted in agriculture, and has been applied to the planting of wheat, rice, corn, soybean, sorghum, cotton, watermelon and other crops, and the effect of increasing production is obvious. Plastic film mulching can play a role in moisture conservation and drought resistance, improve soil physical shape, and provide a good soil environment for crop root system, especially the maintenance of root system vitality in the later stage. In addition, plastic film mulching can also maintain water and soil, reduce nutrient loss, improve fertilizer efficiency, suppress weeds, reduce plant diseases and insect pests, improve light energy utilization efficiency, increase early maturity, increase robust growth, prevent lodging, and enhance the abili...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L67/02C08L63/00C08K5/29C08K5/1515C08J3/24
CPCC08J3/246C08J2367/04C08J2463/00C08J2467/02C08L67/04C08L2201/06C08L2203/16C08L2205/02C08L2205/03C08L2312/00C08L67/02C08K5/29C08K5/1515C08L63/00
Inventor 边新超刘焱龙张瑜张宝李杲庞烜陈学思
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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