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Degradable agricultural film and preparation method

An agricultural film and film technology, applied in the field of degradable agricultural film and preparation, can solve the problems of the film being not easy to degrade, poor in air permeability, easy to produce pollution, etc., and achieve the effects of being beneficial to growth, strong air permeability and outstanding heat preservation.

Active Publication Date: 2020-09-04
CHENGDE RENHE MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, the present invention provides a degradable agricultural film and a preparation method to solve the problems that the existing film is not easy to degrade, easy to produce pollution, and poor air permeability

Method used

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  • Degradable agricultural film and preparation method
  • Degradable agricultural film and preparation method
  • Degradable agricultural film and preparation method

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preparation example Construction

[0041] Such as figure 1 As shown, the preparation method of the degradable agricultural film according to the embodiment of the present invention comprises:

[0042] Step S1, mixing raw materials to obtain a mixture;

[0043] Step S2, putting the mixture into a twin-screw extruder to extrude the colloid;

[0044] Step S3, casting the colloid into a film on a casting machine;

[0045] Step S4, drying and cooling the film to obtain a degradable agricultural film;

[0046] Wherein, described raw material comprises:

[0047] 100-120 parts by weight of thermoplastic starch modified polyvinyl chloride;

[0048] 5-15 parts by weight of inorganic nonmetals;

[0049] 0.8-2 parts by weight of plasticizer.

[0050] That is to say, in the above-mentioned preparation process, the raw materials are evenly mixed according to a certain ratio, and a certain solvent, such as water, can be added; the mixture is put into a twin-screw extruder to extrude the colloid; Casting film on the mac...

Embodiment 1

[0073] After mixing the raw materials, stir them evenly at 200r / min at a temperature of 50°C to obtain a mixture;

[0074] Put the mixture into a twin-screw extruder to extrude the colloid;

[0075] Casting the colloid into a film on a casting machine;

[0076] The film is dried, cooled, trimmed, and rolled to obtain a degradable agricultural film;

[0077] Among them, the raw materials include: 100 parts by weight of thermoplastic starch modified polyvinyl chloride, 12 parts by weight of inorganic nonmetal, 1.5 parts by weight of plasticizer, 0.2 part by weight of lubricant and 0.6 part by weight of nucleating agent; Ionic illite and kaolin, the plasticizer is trinonyl citrate, the lubricant is paraffin, the nucleating agent is talc, and the content of rare earth ions in the inorganic nonmetal is 1000 μg / g;

[0078] The preparation method of described thermoplastic starch modified polyvinyl chloride comprises:

[0079] 0.6 parts by weight of paraffin, 20 parts by weight of...

Embodiment 2

[0082] After mixing the raw materials, stir them evenly at 200r / min at a temperature of 50°C to obtain a mixture;

[0083] Put the mixture into a twin-screw extruder to extrude the colloid;

[0084] Casting the colloid into a film on a casting machine;

[0085] The film is dried, cooled, trimmed, and rolled to obtain a degradable agricultural film;

[0086] Among them, the raw materials include: 100 parts by weight of thermoplastic starch modified polyvinyl chloride, 8 parts by weight of inorganic nonmetal, 2 parts by weight of plasticizer, 1 part by weight of lubricant and 0.2 part by weight of nucleating agent; Ionic illite and kaolin, the plasticizer is trinonyl citrate, the lubricant is paraffin, the nucleating agent is talc, and the content of rare earth ions in the inorganic nonmetal is 1200 μg / g;

[0087] The preparation method of described thermoplastic starch modified polyvinyl chloride comprises:

[0088] 1 part by weight of paraffin, 30 parts by weight of polyvin...

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Abstract

The invention provides a preparation method of a degradable agricultural film and the agricultural film. The preparation method comprises the steps of mixing raw materials to obtain a mixture; puttingthe mixture into a twin-screw extruder to extrude colloid; casting the colloid on a casting film machine into a film; and drying and cooling the film, and thus obtaining the degradable agricultural film. The raw materials comprises 100-120 parts by weight of thermoplastic starch modified polyvinyl chloride, 5-15 parts of weight of inorganic nonmetal and 0.8-2 parts by weight of a plasticizer. Thethermoplastic starch modified polyvinyl chloride, the inorganic nonmetal and the plasticizer are used as the raw materials, and the raw materials are cast into the film after extrusion molding, so that the film can be degraded, has no pollution residue after degradation, can adjust soil after degradation, and has special functions of blocking infrared ray radiation and absorbing peculiar smell offertilizers; the film has strong air permeability, high water permeability and high passability of carbon dioxide gas and can enhance the respiration of crops.

Description

technical field [0001] The invention relates to the field of agricultural films, in particular to a degradable agricultural film and a preparation method. Background technique [0002] In the prior art, agricultural plastic mulch is the most commonly used, which has many disadvantages: it can never be degraded when it is covered on the field, and it needs to be recycled manually. If part of it remains in the soil, it will cause huge pollution to the soil and the environment; it can only It plays a simple role of heat preservation and antifreeze. Generally speaking, there are many disadvantages, the use process is cumbersome, recycling is difficult, and there is pollution. The degradable mulches that have appeared in recent years are too expensive and cost-effective, and farmers are not easy to accept; the function can only play a role in degradation, and some residues remain after degradation. There are few additional functions, and it is easy to cause pollution to the envi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C41/26B29C41/46B29C37/00C08L27/06C08L3/02C08L23/06C08L91/06C08K3/36C08K3/22C08K3/34C08J5/18B29L7/00
CPCB29C41/26B29C41/46B29C37/0092C08J5/18C08J2327/06C08J2303/02C08J2423/06C08J2491/06C08K3/36C08K3/22C08K3/346C08K2003/2227C08K2003/2206C08K2003/222B29L2007/00
Inventor 郎宝龙隋英丹李炳岐
Owner CHENGDE RENHE MINING CO LTD