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Full-biodegradable plastic mulching film, preparation method and application thereof

A biodegradable plastic and all-biological technology, applied in botany equipment and methods, applications, plant protection, etc., can solve problems such as early cracking, unsuitable for large-scale promotion, poor constructability of mulch films, etc., and achieve good dispersion and interface binding effect

Inactive Publication Date: 2021-06-18
北京惠林苑生物科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the degradation cycle of biodegradable plastics is significantly higher than the growth cycle of crops, and the addition of starch reduces the mechanical strength and water resistance of the mulch, and causes poor constructability and unexpected early cracking of the mulch, thus affecting the mulch. Practicality, not suitable for large-scale promotion

Method used

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  • Full-biodegradable plastic mulching film, preparation method and application thereof
  • Full-biodegradable plastic mulching film, preparation method and application thereof
  • Full-biodegradable plastic mulching film, preparation method and application thereof

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preparation example Construction

[0037] In the fully biodegradable plastic mulch film according to the present invention, the preparation method of the modified starch includes the following steps: (1) Paste making: adding the starch raw material into an alkaline solution of sodium hydroxide with a pH of 8-9 and mixing and stirring into starch slurry, heated at 80-90°C to become pasty starch slurry, the mass concentration of starch in the starch slurry is 50% to 80%; (2) modification reaction: by weight ratio, in 100 parts of pasty starch slurry , add 10 parts of toluene diisocyanate and ethylene-vinyl acetate copolymer mixed emulsion, 0.2-1 part of stannous octoate and 2-4 parts of polyvinyl alcohol aqueous solution, and then react at 75 ° C to 105 ° C for 10-20 hours to obtain modified starch slurry ; Wherein the mass ratio of toluene diisocyanate and ethylene-vinyl acetate copolymer is 1:0.2~1, the mass concentration of the emulsion is 20-40%; the mass concentration of the polyvinyl alcohol aqueous solution...

Embodiment 1

[0045] (1) Prepare modified starch:

[0046] (1) Paste preparation: the corn starch raw material is added into a sodium hydroxide alkaline solution with a pH of 8, mixed and stirred to form a starch slurry, heated at 80° C. to become a paste starch slurry, and the mass concentration of starch in the starch slurry is 50%;

[0047] (2) Modification reaction: by weight, in 100 parts of pasty starch slurry, add 10 parts of toluene diisocyanate and ethylene-vinyl acetate copolymer mixed emulsion, 0.2 part of stannous octoate and 2 parts of polyvinyl alcohol aqueous solution, Then react at 75°C for 10h to obtain modified starch slurry; wherein the mass ratio of toluene diisocyanate and ethylene-vinyl acetate copolymer is 1:0.2~1, and the mass concentration of the emulsion is 20%; the mass concentration of the polyvinyl alcohol aqueous solution 10%;

[0048] (3) Post-treatment: drying, grinding and sieving the modified starch slurry to obtain modified starch.

[0049] (2) Preparati...

Embodiment 2

[0060] (1) Prepare modified starch:

[0061](1) Paste: the potato starch raw material is added into a sodium hydroxide alkaline solution with a pH of 8.5, mixed and stirred to form a starch slurry, and heated at 85° C. to become a paste-like starch slurry, and the mass concentration of starch in the starch slurry is 60%;

[0062] (2) Modification reaction: by weight, in 100 parts of pasty starch slurry, add 10 parts of toluene diisocyanate and ethylene-vinyl acetate copolymer mixed emulsion, 0.6 part of stannous octoate and 3 parts of polyvinyl alcohol aqueous solution, Then react at 90°C for 15h to obtain modified starch slurry; wherein the mass ratio of toluene diisocyanate and ethylene-vinyl acetate copolymer is 1:0.2~1, and the mass concentration of the emulsion is 30%; the mass concentration of the polyvinyl alcohol aqueous solution 15%;

[0063] (3) Post-treatment: drying, grinding and sieving the modified starch slurry to obtain modified starch.

[0064] (2) Preparati...

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Abstract

The invention provides a full-biodegradable plastic mulching film, a preparation method and application thereof. The full-biodegradable plastic mulching film comprises the following components in parts by weight: 100 parts of a full-biodegradable resin, 10-30 parts of an auxiliary agent, 10-60 parts of modified starch and 10-100 parts of modified calcium carbonate, wherein the full-biodegradable resin is prepared from one or more of poly (butylene succinate) (PBS), polylactic acid (PLA), polyhydroxyalkanoate (PHA), poly (butylene adipate-butylene terephthalate) (PBAT) and polypropylene carbonate (PPC). According to the biodegradable mulching film, the contradiction that crops need longer service life of the mulching film and lower thickness of the mulching film and the requirement on the lowest thickness of a polyethylene plastic mulching film can be solved, and the technical scheme of the biodegradable mulching film also has the effects of slow degradation in the early stage, strong protection capability and accelerated degradation in the later stage, so that the influence of the biodegradable mulching film on the planting of succeeding crops is reduced.

Description

technical field [0001] The present invention relates to the field of agricultural mulch, and more specifically, to a fully biodegradable plastic mulch, a preparation method and application thereof. Background technique [0002] China is the world's most important producer, consumer and exporter of garlic. Its exports account for more than half of the world's total exports. The total planting area is about 10 million mu. The planting areas are widely distributed, but the areas are mainly concentrated in Shandong, Henan and Jiangsu. provinces, the planting area of ​​these three provinces accounts for more than 50% of the total area of ​​the country. [0003] Garlic likes a cool environment, and the suitable growth temperature is 12°C to 26°C. Garlic cloves can germinate at a low temperature of 3°C to 5°C, and the optimum temperature for bulb (garlic) formation is 15°C to 20°C. ℃. Garlic seedlings have strong cold resistance and can tolerate low temperatures of -10°C for a sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08L67/04C08L3/04C08K9/06C08K9/10C08K9/04C08K3/26C08J5/18A01G13/02
CPCC08J5/18A01G13/0275C08J2367/02C08J2367/04C08J2403/04C08K9/06C08K9/10C08K9/08C08K2003/265C08K2201/011Y02A40/28
Inventor 苑会林李继伟石岩胡东良
Owner 北京惠林苑生物科技有限公司
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