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Biodegradable agricultural mulching film modified material and preparation method thereof

A technology for modifying materials and agricultural mulch, applied in plant protection cover, climate change adaptation, etc., can solve problems such as prolonging the induction period of degraded mulch, and achieve the effect of reducing the surface energy of the material, improving the effect, and improving the water vapor barrier performance.

Active Publication Date: 2022-08-05
WANHUA CHEMICAL (NINGBO) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the introduction of water-absorbent resin can absorb the water in the soil. On the one hand, it has the effect of water retention, and at the same time, it inhibits the hydrolysis caused by the direct contact of the ester group in the mulch film with water, and the water-absorbent resin slowly releases the preservative through reverse osmosis. Bacteria and other microorganisms degrade the degraded plastic film, avoiding the problem of rapid loss during use in the direct addition of materials, and effectively prolonging the induction period of the degradable plastic film

Method used

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  • Biodegradable agricultural mulching film modified material and preparation method thereof
  • Biodegradable agricultural mulching film modified material and preparation method thereof
  • Biodegradable agricultural mulching film modified material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] (1) First, according to the ratio of 95:5:0.2, weigh 86.45kg of PBAT resin, 4.55kg of oxidized polyethylene wax (TLZJ-4), and 0.18kg of chain extender (HDI), respectively. The twin-screw extruder performs melt blending and grafting to obtain graft-modified PBAT resin.

[0057] (2) First, weigh 0.1kg of antiseptic and add it into 0.4kg of water to form a uniform solution, then spray the above solution in 0.5kg of water-absorbent resin powder, stir evenly for 5 minutes, and obtain 1kg of modified water-absorbent resin particles;

[0058] (3) above-mentioned 1kg modified water-absorbing resin and 91kg graft modified PBAT resin and 3kg PLA resin, 5kg calcium carbonate and 0.2kg antioxidant, 0.3kg ultraviolet absorber, 0.2kg lubricant are added in MIXER agitator, 600rpm Stir at a stirring speed of / min for 4 minutes and mix evenly, add it to the twin-screw extrusion through the main feeding method, and extract the water in the material by vacuuming at the end of the extruder...

Embodiment 2

[0060] (1) First, according to the ratio of 93:7:0.3, weigh 79.98kg of PBAT resin, 6.02kg of oxidized polyethylene wax (TLZJ-4), and 0.26kg of chain extender (HDI). The twin-screw extruder performs melt blending and grafting to obtain graft-modified PBAT resin.

[0061] (2) first weigh 0.2kg of preservative and add it to 0.8kg of water to form a uniform solution, then spray the above solution in 1.0kg of water-absorbent resin powder, stir evenly and stand still for 5min to obtain 2kg of modified water-absorbent resin particles;

[0062] (3) above-mentioned 2kg modified water-absorbing resin and 86kg graft modified PBAT resin and 5kg PLA resin, 7kg calcium carbonate and 0.3kg antioxidant, 0.5kg ultraviolet absorber, 0.3kg lubricant are added in the MIXER stirrer, 600rpm Stir at a stirring speed of / min for 4 minutes and mix evenly, add it to the twin-screw extrusion through the main feeding method, and extract the water in the material by vacuuming at the end of the extruder, t...

Embodiment 3

[0064] (1) First, according to the ratio of 91:9:0.5, weigh 71.89kg of PBAT resin, 7.11kg of oxidized polyethylene wax (TLZJ-0), and 0.40kg of chain extender (epoxy chain extender), and mix them with a MIXER mixer After homogenization, the graft-modified PBAT resin is obtained by melt blending and grafting through a twin-screw extruder.

[0065] (2) first weigh 0.3kg of antiseptic and add it to 1.2kg of water to form a uniform solution, then spray the above solution evenly in 2.5kg of water-absorbent resin powder, stir evenly and stand still for 5min to obtain 4kg of modified water-absorbent resin particles;

[0066] (3) above-mentioned 4kg modified water-absorbing resin and 79kg graft modified PBAT resin and 7kg PLA resin, 10kg calcium carbonate and 0.4kg antioxidant, 0.8kg ultraviolet absorber, 0.4kg lubricant are added in MIXER agitator, 600rpm Stir at a stirring speed of / min for 4 minutes and mix evenly, add it to the twin-screw extrusion through the main feeding method, ...

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Abstract

The invention provides a biodegradable agricultural mulching film modified material and a preparation method thereof. Graft-modified PBAT resin is oxidized polyethlene wax graft-modified PBAT resin; the modified water-absorbent resin is water-absorbent resin particles for adsorbing the preservative. A hydrophobic polyethylene alkyl chain structure is introduced in a polyethylene wax grafting modification PBAT mode, and the polyethylene alkyl chain structure is easy to migrate to the surface of the material after film blowing, so that the surface energy of the material is reduced, and the water resistance of the material is improved. By introducing the water-absorbent resin, hydrolysis caused by direct contact of ester groups in the mulching film with water can be inhibited, and the water-absorbent resin slowly releases the preservative in a reverse osmosis manner, so that the degradation of microorganisms such as bacteria in soil on the degradable mulching film can be inhibited, and the problem of rapid loss in the use process due to direct addition of the preservative into the material is avoided; the induction period of the degradable mulching film is effectively prolonged.

Description

technical field [0001] The invention belongs to the field of degradable plastics, and in particular relates to a biodegradable agricultural plastic film modified PBAT material with high water resistance and long induction period and a preparation method thereof. Background technique [0002] Agricultural mulch film is arable ground covering film, usually transparent or black PE film, also has green and silver film, which is used for farmland mulching to increase soil temperature, maintain soil moisture, maintain soil structure, and prevent pests from attacking crops and certain microorganisms. Diseases, etc., to promote the function of plant growth. The global plastic film consumption is 1.95 million tons / year, China is 1.45 million tons / year, accounting for 74%, and the covered area is nearly 300 million mu. The application of plastic film not only brings benefits to farmland, but also brings huge pollution to farmland. my country's farmland will add 200,000 to 300,000 ton...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L87/00C08L67/04C08L33/02C08K3/26C08K5/09C08K5/098C08J5/18C08G81/02A01G13/02
CPCC08J5/18C08G81/027A01G13/0275C08J2387/00C08J2467/04C08J2433/02C08K2003/265C08K5/09C08K5/098Y02A40/28
Inventor 李保印祁先勇詹佐民李熠宇黄建王倩倩花月庆郭晨超童艳萍陈连清
Owner WANHUA CHEMICAL (NINGBO) CO LTD
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