A kind of preparation method of nutritional degradable mulch material

A degradable mulch film and nutrient-based technology, applied in botany equipment and methods, hyaluronic acid coatings, chitin polysaccharide coatings, etc., can solve problems that affect soil air permeability, water permeability, difficulty in transporting nutrients and water, and crop production reduction. , to achieve high-value utilization, low cost, and avoid pollution

Active Publication Date: 2022-03-01
TAISHAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the agricultural plastic mulch commonly used in traditional technology has many disadvantages: on the one hand, although the plastic mulch has excellent mechanical properties, it cannot be degraded, and the residual film inhibits the activity of microorganisms, affects the air and water permeability of the soil, and causes the loss of nutrients in the soil. Material and water transportation is difficult, resulting in crop yield reduction; on the other hand, it has little functionality and can only play the role of heat preservation and moisture conservation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1 Preparation of nutrient-type degradable mulch material

[0022] Step 1: Prepare the solvent system. At 50°C, add humic acid to sodium hydroxide solution and stir for 1 hour, then add urea to obtain 100 g of sodium hydroxide / humic acid / urea aqueous solution (6% sodium hydroxide, 1.5% humic acid and 12% urea);

[0023] The second step: dissolve the cellulose. Pre-cool the sodium hydroxide / humic acid / urea system at -18°C for 6 hours, add 3g of cellulose at room temperature, and stir vigorously for 4 minutes until the cellulose is completely dissolved;

[0024] The third step: preparing the base film. Ultrasonic degassing is performed on the casting solution, and after casting and forming a film, an acidic aqueous solution is used as a coagulation bath for phase separation. The mass ratio of water and citric acid in the acidic aqueous solution is 200:1, the temperature of the coagulation bath is 25 ° C, and the time is 15 minutes. After washing and drying, t...

Embodiment 2

[0027] Embodiment 2 Preparation of nutrient-type degradable mulch material

[0028] Step 1: Prepare the solvent system. At 80°C, add humic acid to sodium hydroxide solution and stir for 1 hour, then add urea to obtain 100 g of sodium hydroxide / humic acid / urea aqueous solution (7% sodium hydroxide, 2% humic acid and 12% urea);

[0029] The second step: dissolve the cellulose. Pre-cool the sodium hydroxide / humic acid / urea system at -15°C for 7 hours, add 4g of cellulose at room temperature, and stir vigorously for 4 minutes until the cellulose is completely dissolved;

[0030] The third step: preparing the base film. Ultrasonic defoaming was performed on the casting solution, and after casting and film formation, an acidic aqueous solution was used as a coagulation bath for phase separation. The mass ratio of water and citric acid in the acidic aqueous solution was 200:1, the temperature of the coagulation bath was 40°C, and the time was 12 minutes. After washing and drying, ...

Embodiment 3

[0033] Embodiment 3 Preparation of nutritional degradable mulch material

[0034] Step 1: Prepare the solvent system. At 90°C, add humic acid to sodium hydroxide solution and stir for 1 hour, then add urea to obtain 100 g of sodium hydroxide / humic acid / urea aqueous solution (8% sodium hydroxide, 2.5% humic acid and 12% urea);

[0035] The second step: dissolve the cellulose. Pre-cool the sodium hydroxide / humic acid / urea system at -12°C for 8 hours, add 4.5g of cellulose at room temperature, and stir vigorously for 4 minutes until the cellulose is completely dissolved;

[0036] The third step: preparing the base film. Ultrasonic degassing is performed on the casting solution, and after casting and film formation, an acidic aqueous solution is used as a coagulation bath for phase separation. The mass ratio of water and citric acid in the acidic aqueous solution is 200:1, the temperature of the coagulation bath is 60 ° C, and the time is 10 minutes. After washing and drying, t...

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Abstract

The invention discloses a preparation method of a nutrient-type degradable plastic film material. Dissolve cellulose in the prepared sodium hydroxide / humic acid / urea system solution to obtain a casting solution, and use an acidic aqueous solution as a coagulation bath after casting to form a film, and use a phase inversion method to obtain a cellulose / humic acid film; use nepheline powder, acrylic acid The chitosan is blended and modified by triol, and then the modified chitosan solution is coated on the surface of the cellulose / humic acid film, and the surface layer is solidified by solvent evaporation, alkaline aqueous solution, washed and dried to obtain a nutritionally degradable Mulch material. The preparation process involved in the invention is simple, the solvent system is environmentally friendly, and the prepared degradable film material has good strength and toughness, is degradable, has low cost, and has certain nutritional effects on soil and crops. The invention is beneficial to realizing high-value utilization of biomass materials and replacing traditional polyethylene film materials, and has great practical application value and economic benefits.

Description

technical field [0001] The invention relates to an agricultural mulch film, in particular to a preparation method of a nutrient-type degradable mulch film material, which is especially suitable for the use of a ground covering film with a nutritional function in agriculture. Background technique [0002] The emergence and application of plastic film has greatly promoted the improvement of agricultural output and efficiency, and led to the change of agricultural production mode and the development of agricultural productivity. However, the agricultural plastic mulch commonly used in traditional technology has many disadvantages: on the one hand, although the plastic mulch has excellent mechanical properties, it cannot be degraded, and the residual film inhibits the activity of microorganisms, affects the air and water permeability of the soil, and causes the loss of nutrients in the soil. Material and water transportation is difficult, resulting in crop yield reduction; on th...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C08J7/04C08J5/18C08J3/03C08L1/02C08L97/00C08K5/21C09D105/08C09D7/61C09D7/63A01G13/02
CPCC08J5/18C08J3/03C09D105/08C09D7/61C09D7/63A01G13/0275C08J2301/02C08J2405/08C08J2497/00C08K3/22C08K5/21A01G2013/004C08K5/053C08K3/34Y02A40/28
Inventor孙中华宁如霞梁洁刘欣王爱艾夏征仲晨
OwnerTAISHAN UNIV