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Environmentally-friendly controllable degradation agricultural film and preparation method thereof

An agricultural mulch film, an environmentally friendly technology, applied in the field of environment-friendly controllable degradable agricultural mulch film and its preparation, can solve the problems of affecting the film degradation rate, the decrease of film mechanical properties, and the high cost of film, and achieve fully controllable photocatalysis-biodegradation , to avoid the decline of mechanical properties and improve the effect of degradation rate

Inactive Publication Date: 2012-11-28
NINGXIA GREEN BIODEGRADABLE PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it still has some problems: 1) due to the excessive amount of plasticizer added (at least 24wt%, up to 38wt%), it is inevitable that this type of film will produce plasticizer on the film surface after standing for a period of time. The problem of precipitation, on the one hand, will reduce the mechanical properties of the film in the later stage, affect the performance, and on the other hand, it will increase the cost
2) Because the amount of starch added is not high (only 8.17-38wt%), it will not only make the cost of the obtained film still high, but also affect the degradation rate of the film to a certain extent
3) Due to the added ZnO / SiO 2 The preparation process of composite powder is very complicated, the cycle is long and the chemical reagents used are large, which will undoubtedly affect the production capacity of the film and increase the cost to a certain extent.
[0006] Other studies have shown (Wang Yunfang et al., Progress in Research on Starch-Based Environmentally Degradable Polymer Materials [J], Materials Herald, 2005, 4:12-15), while starch can improve the degradability of plastics, on the one hand it will cause its physical degradation. The decline in mechanical properties makes it difficult to process. On the other hand, it is too hydrophilic and has poor compatibility with most general-purpose resins, resulting in a significant decline in the mechanical properties of the material, thus hindering the industrialization of starch plastics. Wide application in the promotion process
Therefore, in order to ensure the end-use performance of starch-based plastic products, the general solution is to reduce the amount of starch added, but this will bring about higher product costs and slower degradation.

Method used

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  • Environmentally-friendly controllable degradation agricultural film and preparation method thereof
  • Environmentally-friendly controllable degradation agricultural film and preparation method thereof
  • Environmentally-friendly controllable degradation agricultural film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Mixed crystal nano-titanium dioxide (P25 produced by Evonik Degussa, Germany, with a specific surface area of ​​50 ± 15m) with a particle size of 20-30nm 2 / g, wherein the content of anatase nano-titanium dioxide is 80%) 50 parts are put into the ultra-high-speed mixer, and stirred for 20 minutes at 4000 rpm, during which 1 part of γ-aminopropylmethyldiethoxy The mixture of silane and 80 parts of absolute ethanol is added in two times. After the addition, continue to stir and mix at ultra-high speed for 1.5 hours, then filter with suction, dry the powder at 120°C, and put it into a ball mill for grinding for at least 1 hour.

[0045] 0.2 parts of the obtained surface-modified nano additives and 5 parts of polyoxyethylene polyoxypropylene ether block copolymers with a relative molecular weight of 1000 g / mol, 10 parts of acetyl tri-n-butyl citrate and triethyl citrate 5 parts of esters were dispersed by colloid mill for 2 hours, and then mixed with 75 parts of corn starch...

Embodiment 2

[0048] Mixed crystal nano-titanium dioxide (P25 produced by Evonik Degussa, Germany, with a specific surface area of ​​50 ± 15m) with a particle size of 20-30nm 2 / g, the content of anatase nano-titanium dioxide is 80%) 30 parts are put into the ultra-high speed mixer, stir 30 minutes under 3000 revs / min, wherein 0.5 part of γ-aminopropyl methyldiethoxysilane Add the mixed liquid with 50 parts of absolute ethanol in 3 times. After the addition, continue to stir and mix at ultra-high speed for 2 hours, then filter with suction, dry the powder at 110°C, and put it into a ball mill for grinding for at least 1 hour.

[0049] 5 parts of polyoxyethylene polyoxypropylene ether block copolymer and 15 parts of triethyl citrate are dispersed 1 hour by colloid mill after the obtained surface-modified nano-auxiliary 1 part and relative molecular weight are 1500g / mol, then With 40 parts of rice starch, 40 parts of mung bean starch, 10 parts of polyvinyl alcohol of 1799, and 1 part of 2,2'-...

Embodiment 3

[0052] Mixed crystal nano-titanium dioxide (P25 produced by Evonik Degussa, Germany, with a specific surface area of ​​50 ± 15m) with a particle size of 20-30nm 2 / g, the content of anatase nano-titanium dioxide is 80%) 30 parts are put into the ultra-high-speed mixer, stirred for 10 minutes at 5000 rpm, during which 1.5 parts of γ-aminopropylmethyldiethoxysilane Add the mixed solution with 100 parts of absolute ethanol in 3 times. After the addition, continue to stir and mix at ultra-high speed for 1.5 hours, then filter with suction, dry the powder at 110°C, and put it into a ball mill for grinding for at least 1 hour.

[0053] 5 parts of polyoxyethylene polyoxypropylene ether block copolymers and 10 parts of acetyl tri-n-butyl citrate are dispersed by colloid mill for 1.5 parts of nano-auxiliaries obtained after surface modification and relative molecular weight of 4000g / mol hour, then with 30 parts of lotus root starch, 42 parts of potato starch, 20 parts of polyvinyl alcoh...

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Abstract

The invention discloses an environmentally-friendly controllable degradation agricultural film. The agricultural film is prepared from the following raw materials in parts by weight through melt blending and extrusion film blowing: 25-50 parts of polyvinyl alcohol, 72-87 parts of starch, 10-20 parts of micro-molecular plasticizer, 0.2-2 parts of modified inorganic nano auxiliary agent, 0.5-1.5 parts of antioxidant, 0.5-1.5 parts of compatibilizer and 0.2-1.5 parts of ultraviolet ray absorbent. The invention also discloses a preparation method for the agricultural film. A certain amount of inorganic nano auxiliary agent which is subjected to surface treatment is added while the micro-molecular plasticizer which can easily form a hydrogen bond with the starch is adopted as a nano composite modifier included in the agricultural film provided by the invention, so that the using amount of the micro-molecular compatibilizer can be greatly reduced to reduce cost and avoid a problem of reduced mechanical property at the later stage of a thin film after PVA (Polyvinyl Alcohol) is modified by the compatibilizer, and the controllable completely biodegradable agricultural film with plastic thin film mechanical property and later stage service performance can also be obtained.

Description

technical field [0001] The invention belongs to the technical field of agricultural mulch and its preparation, and in particular relates to an environment-friendly controllable degradable agricultural mulch and a preparation method thereof. Background technique [0002] At present, drought caused by resource consumption and environmental deterioration is an extremely serious problem in my country's agricultural production. In agricultural production, mulching with plastic film not only has the functions of moisturizing, water retention, fertilizer preservation, pest control and weed control, but also can maintain soil moisture, improve water use efficiency, improve the growth environment of crops, increase crop yield and agricultural benefits, so the application is more widely. According to reports, agricultural mulch has become the third largest agricultural material after chemical fertilizers and pesticides in agricultural production. But unfortunately, the "white pollut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L3/02C08L29/04C08L71/02C08K13/06C08K9/06C08K3/22C08K5/11C08K5/132C08K5/3475C08K5/09A01G13/02
Inventor 杨建军侯世荣
Owner NINGXIA GREEN BIODEGRADABLE PROD
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