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Preparation method of biodegradable mulching film for agricultural crops

A technology of biodegradation and crops, which is applied in the field of preparation of biodegradable mulches for crops, can solve problems such as the inability of mulch films to automatically degrade, white pollution of field soil, threats to the ecological environment, etc., and achieve wide sources, low raw material costs, and meet growth needs. Effect

Inactive Publication Date: 2013-09-11
徐州沃尔地农业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional mulch is mostly made of artificially synthesized plastics. After use, the mulch cannot be automatically degraded. Long-term use will cause serious white pollution to the field soil and pose a huge threat to the ecological environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Take 100 parts by mass of cornstarch and put it into a reaction kettle filled with 500 parts by mass of water, heat up to 70°C under stirring, react for 0.5h, and cool down to room temperature to obtain starch liquid;

[0017] (2) Add a mixture of dipotassium hydrogen phosphate and potassium dihydrogen phosphate to the starch solution in step (1), adjust the pH of the starch solution to 6, heat up to 60°C under stirring, and then add 5 parts by mass of trimetaphosphoric acid Potassium, after 20 minutes, add 25 parts by mass of polyvinyl alcohol, react for 3 hours, and naturally cool to room temperature to obtain a reaction solution;

[0018] (3) Add 6 parts by mass of sodium dodecylbenzenesulfonate to the reaction solution obtained in step (2), stir for 0.5 minutes, then filter and dry the final solution to obtain reaction particles;

[0019] (4) Blow the reaction granules obtained in step (3) into a film on a film blowing machine.

[0020] A degradation experiment...

Embodiment 2

[0022] (1) Take 100 parts by mass of tapioca starch and put it into a reaction kettle filled with 550 parts by mass of water, heat up to 75°C under stirring, react for 0.7h, and cool down to room temperature to obtain starch liquid;

[0023] (2) Add a mixture of dipotassium hydrogen phosphate and potassium dihydrogen phosphate to the starch solution in step (1), adjust the pH of the starch solution to 7, heat up to 65°C under stirring, and then add 8 parts by mass of hexametaphosphoric acid Potassium, after 30 minutes, add 30 parts by mass of polyvinyl alcohol, react for 5 hours, and naturally cool to room temperature to obtain a reaction solution;

[0024] (3) Add 8 parts by mass of stearic acid to the reaction solution obtained in step (2), and after stirring for 1 hour, suction filter and dry the final solution to obtain reaction particles;

[0025] (4) Blow the reaction granules obtained in step (3) into a film on a film blowing machine.

[0026] A degradation experiment ...

Embodiment 3

[0028] (1) Take 100 parts by mass of tapioca starch and put it into a reaction kettle filled with 600 parts by mass of water, heat up to 85°C under stirring, and after 1 hour of reaction, cool down to room temperature to obtain starch liquid;

[0029] (2) Add a mixture of dipotassium hydrogen phosphate and potassium dihydrogen phosphate to the starch solution in step (1), adjust the pH of the starch solution to 8, heat up to 70°C under stirring, and then add 12 parts by mass of trimetaphosphoric acid Potassium, after 40min, then add 35 parts by mass of polyvinyl alcohol, react for 6.5h, naturally cool to room temperature, and obtain the reaction solution;

[0030] (3) Add 10 parts by mass of sodium dodecylbenzenesulfonate to the reaction solution obtained in step (2), stir for 1.5 hours, then filter and dry the final solution to obtain reaction particles;

[0031] (4) Blow the reaction granules obtained in step (3) into a film on a film blowing machine.

[0032] A degradation...

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Abstract

The invention discloses a preparation method for a biodegradable mulching film for agricultural crops. The preparation method comprises the following steps of: adding 100 parts by mass of starch into a reaction kettle filled with 500 to 600 parts by mass of water; heating the mixture to 70 to 85 DEG C; reacting for 0.5 to 1 hour; cooling the reactant to room temperature to obtain a starch solution; adding a pH adjusting agent into the starch solution to adjust the pH to be 6 to 8; heating the solution to 60 to 70 DEG C; adding 5 to 12 parts by mass of cross-linking agent; after 20 to 40 minutes, adding 25 to 35 parts by mass of polyvinyl alcohol for reacting 3 to 6.5 hours; cooling the solution to room temperature to obtain a reaction solution; adding 6 to 10 parts by mass of active agent into the reaction solution; after stirring the solution for 0.5 to.15 hours, filtering and drying the final solution to obtain reaction particles; and blowing the reaction particles to form the mulching film on a film blowing machine. The preparation method has the beneficial effects that the raw materials for preparing the mulching film are low in cost and wide in source; the mulching film can be degraded naturally; and the degraded decomposition products contain potassium which can meet the requirement on the growth of the agricultural crops.

Description

technical field [0001] The invention relates to a preparation method of a biodegradable mulch film for crops, belonging to the technical field of crop cultivation. Background technique [0002] Mulching film cultivation technology is widely used in the process of crop planting. After mulching cultivation with plastic film, it can improve the temperature and moisture status of the soil and near the ground, increase soil temperature, maintain soil moisture, improve soil properties, and improve soil nutrient supply and fertilizer utilization. It can improve the light conditions, reduce the damage of weeds and diseases and insect pests, and provide an effective guarantee for the growth of early crops. The traditional mulch is mostly made of artificially synthesized plastics. After use, the mulch cannot be automatically degraded. Long-term use will cause serious white pollution to the field soil and pose a huge threat to the ecological environment. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L3/02C08L29/04C08J3/24C08K5/09C08K5/42A01G13/02
CPCY02A40/28
Inventor 陈崇合
Owner 徐州沃尔地农业科技有限公司
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