Preparing method of degradable water storage mulching film

A technology of mulch film and preparation steps, which is applied in the field of preparation of degradable water storage mulch film, can solve the problems of reducing brittleness and poor water retention performance of the mulch film, and achieve the effects of good water retention capacity, obvious heat preservation and moisturizing effect, and good degradation effect

Inactive Publication Date: 2017-03-15
吴迪
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention: Aiming at the problem of poor water retention performance of the existing film, the present invention provides a degradable water storage film. The present invention uses reed stalks as raw materials, and steam blasts, dissolves and removes impurities to obtain reeds. Rod fibers, and then through epichlorohydrin to destroy the hydrogen bonds in the starch molecules and between molecules, and through epichlorohydrin grafting and crosslinking, the plasticity and flexibility of starch are enhanced, the brittleness is reduced, and the starch is easy to process and shape. Finally, reed stalk fiber, modified starch, chitosan, nano-silica, polyvinyl alcohol, etc. are mixed and cross-linked, scraped to form a film, and sealed with a hot press to obtain a degradable water storage film.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] Weigh 3kg reed stalks, put them into a pulverizer after natural air drying, and pass through a 100-mesh sieve. Put the sieved reed stalk powder into a steam explosion tank, heat it to 110 ° C, and pass water vapor into the steam explosion tank to The pressure in the tank is 1.6MPa. After maintaining the pressure for 5 minutes, open the valve of the steam explosion tank to release the pressure to normal pressure, then soak in 70°C deionized water for 10 minutes, filter and collect the filter residue to obtain the steam explosion treated reed stem powder; The reed stalk powder treated by steam explosion was soaked in 500mL of 10% hydrogen peroxide, and reacted in a constant temperature water bath at 70°C for 1 hour to obtain a mixed solution, and the pH of the mixed solution was adjusted to 11.0 with a 5% sodium hydroxide solution. and reacted in a constant temperature water bath at 80°C for 2 hours, then vacuum filtered, and then washed the filter cake with a 50% ethanol ...

example 2

[0021]Weigh 4kg reed stalks, put them into a pulverizer after natural air drying, and pass through a 100-mesh sieve. Put the sieved reed stalk powder into a steam explosion tank, heat it to 115 ° C, and pass water vapor into the steam explosion tank to The pressure in the tank is 1.7MPa. After maintaining the pressure for 6 minutes, open the valve of the steam explosion tank to release the pressure to normal pressure, then soak in 79°C deionized water for 12 minutes, filter and collect the filter residue to obtain the steam explosion treated reed stalk powder; The reed stalk powder was treated by steam explosion above, soaked in 550mL of 10% hydrogen peroxide, and reacted in a constant temperature water bath at 75°C for 1.5h to obtain a mixed solution, and then adjusted the pH of the mixed solution to 11.5 with a 5% sodium hydroxide solution , and reacted in a constant temperature water bath at 82°C for 2.5h, then vacuum filtered, and then washed the filter cake with a 50% etha...

example 3

[0024] Weigh 5kg of reed stalks, put them into a pulverizer after natural air-drying, and pass through a 100-mesh sieve. Put the sieved reed stalk powder into a steam explosion tank, heat it to 120 ° C, and pass water vapor into the steam explosion tank to The pressure in the tank is 1.8MPa. After maintaining the pressure for 8 minutes, open the valve of the steam explosion tank to release the pressure to normal pressure, then soak in 90°C deionized water for 15 minutes, filter and collect the filter residue to obtain the steam explosion treated reed stalk powder; The reed stalk powder treated by steam explosion was soaked in 600mL of 10% hydrogen peroxide, and reacted in a constant temperature water bath at 80°C for 2 hours to obtain a mixed solution, and the pH of the mixed solution was adjusted to 12.0 with a 5% sodium hydroxide solution. and reacted in a constant temperature water bath at 85°C for 3 hours, then vacuum filtered, and then washed the filter cake with a 50% eth...

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Abstract

The invention relates to a preparing method of a degradable water storage mulching film, and belongs to the technical field of functional mulching films. According to the preparing method, reed rods are adopted as raw materials, reed rod fibers are prepared after the reed rods are subjected to steam explosion, dissolution and impurity removing, hydrogen bonds inside the molecules and between the modules of the starch are destroyed through epoxy chloropropane, plasticity and suppleness of the starch are strengthened and brittleness of the starch is reduced through stem grafting and crosslinking of the epoxy chloropropane, so that the starch can be processed and molded easily, then modified starch is prepared, finally the reed rod fiber, the modified starch, chitosan, nanosilicon dioxide, polyvinyl alcohol and the like are subjected to mixed crosslinking and scraped to a film, and the degradable water storage mulching film is prepared after conducting sealed molding on the film through a thermocompressor. The prepared degradable water storage mulching film can be degraded easily, by absorbing moisture in the air, storing the moisture in a sealed molding lattice package, and rising to moisture in high temperature time frame, soil humidity is maintained, an emergence rate of seedlings is improved, soil quality is improved, crop yield is increased, and the degradable water storage mulching film has a good moisture holding effect.

Description

technical field [0001] The invention relates to a preparation method of a degradable water-storage film, which belongs to the technical field of functional film. Background technique [0002] Drought is an extremely serious problem in my country's agricultural production. In agricultural production, plastic film mulching can not only maintain soil moisture and improve water use efficiency, but also improve the growth environment of crops, increase crop yield and agricultural benefits, so it is widely used. According to statistics, the annual consumption of agricultural mulch film has reached 1.6 million tons. However, the problem of "white pollution" caused by the waste film produced after the extensive use of agricultural mulch to the agricultural ecological environment is also becoming more and more serious. This is because the vast majority of common agricultural mulch films are currently made of polypropylene, polyethylene, etc., which cannot be eroded and decomposed i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L3/04C08L5/08C08L97/02C08L29/04C08K3/36C08B31/00A01G13/02
CPCC08L3/04A01G13/0275C08B31/003C08J5/18C08J2303/04C08J2405/08C08K2201/011C08L2201/06C08L2203/16C08L2205/035C08L2205/16C08L5/08C08L97/02C08L29/04C08K3/36
Inventor 吴迪宋豪
Owner 吴迪
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