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Hydrolysis-resistant ultraviolet (UV) photoaging resistant biodegradable plastic mulching film and preparation method thereof

A biodegradable plastic and biodegradable technology, applied in the fields of biodegradable plastic mulch, hydrolysis-resistant and UV-light aging-resistant biodegradable plastic mulch and its preparation, can solve the obstacles to large-scale production, complex mulch processing technology, and no concern for polyester degradation Control problems, etc., to achieve the effect of being beneficial to processing and molding, improving mechanical strength, improving hydrolysis resistance and UV aging resistance

Active Publication Date: 2019-03-29
北京惠林苑生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention patent with application publication number CN103627151A proposes to use antioxidants, ultraviolet light absorbers, and light stabilizers in combination to improve the aging resistance of single-layer polyester fully biodegradable mulches; the invention patent with application publication number CN103587184A mentions A controllable biodegradable mulch film composed of an anti-lysis layer, an anti-aging layer, and an insulation layer, but none of them pay attention to the degradation regulation of polyester; the invention patent with the application publication number of CN105109165A discloses a method composed of the first melt and The fully biodegradable mulch film made by blow molding the second melt through multi-layer co-extrusion, which adds a compound stabilizer composed of antioxidant and ultraviolet absorber to the first melt to improve its weather resistance , and seal the stable layer in the second melt to improve its hydrolysis resistance, but the processing technology of the film is too complicated, and there are certain obstacles in the large-scale production

Method used

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  • Hydrolysis-resistant ultraviolet (UV) photoaging resistant biodegradable plastic mulching film and preparation method thereof
  • Hydrolysis-resistant ultraviolet (UV) photoaging resistant biodegradable plastic mulching film and preparation method thereof
  • Hydrolysis-resistant ultraviolet (UV) photoaging resistant biodegradable plastic mulching film and preparation method thereof

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preparation example Construction

[0029] According to the preparation method of the hydrolysis-resistant UV aging-resistant biodegradable plastic film of the present invention, the preparation method comprises the following steps: (1) polylactic acid, biodegradable polyester, photoinitiator, photocurable polyester oligomer, polyester chain extension Agents, fillers, additives and color masterbatches are mixed evenly with a high-speed mixer in proportion, the speed is 100-600 rpm, and the temperature is not more than 60°C to obtain a mixture; (2) the mixture described in step (1) , use a twin-screw extruder to melt and plasticize, extrude and granulate to obtain pellets, barrel temperature: 140-200°C, head 160-170°C; (3) pass the pellets described in step (2) through Extruded by a single-screw extruder to form a film, irradiated by an ultraviolet light source with an irradiation power of 1-10mW / cm2 and an irradiation time of 1-120 seconds to obtain a hydrolysis-resistant and UV-resistant photoaging biodegradable...

Embodiment 1

[0037] (1) Use a high-speed mixer to mix the uniform mixture in proportion, the rotating speed is 100 rpm, and the temperature is 40°C. The mixture includes in parts by mass:

[0038]

[0039] The composition of black masterbatch in parts by mass: 100 parts of polylactic acid (PLA), 20 parts of carbon black, and 1 part of EBS.

[0040] (2) Melt and plasticize the mixture described in step (1) with an intermeshing counter-rotating twin-screw extruder, extrude and granulate to obtain pellets, barrel temperature: 140°C, head 160°C;

[0041] (3) The pellets described in step (2) are extruded into a film through a single-screw extrusion casting machine, and then irradiated by a high-pressure mercury lamp, and the irradiating power is 1mW / cm 2 , with an irradiation time of 1 second, to obtain a hydrolysis-resistant, UV- and photoaging-resistant biodegradable plastic mulch film.

Embodiment 2

[0043] (1) Use a high-speed mixer to mix the uniform mixture in proportion, the rotating speed is 600 rpm, and the temperature is 50°C. The mixture includes in parts by mass:

[0044]

[0045] Described white masterbatch, by the composition of mass parts: 100 parts of polyadipate / butylene terephthalate (PBAT), 40 parts of titanium dioxide, 3 parts of ethylene bis stearic acid amide (EBS);

[0046] (2) Melt and plasticize the mixture described in step (1) with an intermeshing co-rotating twin-screw extruder, extrude and granulate to obtain pellets, barrel temperature: 200°C, head 170°C;

[0047] (3) The pellets described in step (2) are extruded into a film through a single-screw extrusion blown film machine, and processed by xenon lamp irradiation, and the irradiation power is 10mW / cm 2 , with an irradiation time of 120 seconds, to obtain a hydrolysis-resistant, UV-resistant and photoaging-resistant biodegradable plastic mulch film.

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Abstract

The invention provides a hydrolysis-resistant ultraviolet (UV) photoaging resistant biodegradable plastic mulching film and a preparation method thereof. The hydrolysis-resistant UV photoaging resistant biodegradable plastic mulching film comprises the following raw materials in parts by mass: 100 parts of biodegradable polyester, 0.1-0.5 part of a photoinitiator, 1-5 parts of a light-cured polyester oligomer, 1-5 parts of a polyester chain extender, 1-10 parts of filler and 1-10 parts of an auxiliary agent. The mulching film provided by the invention has the characteristics of hydrolysis resistacne, UV aging resistance and high strength, and the degradation induction period can reach 60-120 days.

Description

technical field [0001] The invention belongs to the technical field of agricultural mulch, and relates to a biodegradable plastic mulch, in particular to a biodegradable plastic mulch resistant to hydrolysis and UV photoaging and a preparation method thereof. Background technique [0002] Agricultural mulch film has been used in my country since the late 1980s. Its good heat preservation, water and fertilizer conservation effects have brought significant increases in production and income to my country's agriculture. However, because the traditional mulch film is made of polyethylene (PE) blow molding, it is not easy to degrade, and it can remain in nature for hundreds of years, causing a large area of ​​"white pollution". Severely pollute the land, causing obvious reduction in crop production and income. [0003] At present, the main solutions to the white pollution problem are recycling and the use of degradable mulch. However, recycling has disadvantages such as low rec...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L67/02C08L69/00C08L75/14C08L3/02C08L63/00C08L33/04C08L67/06C08L71/02C08L97/02C08K13/02C08K5/053C08K3/04C08K3/22C08K5/20C08J5/18C08J3/22A01G13/02
CPCA01G9/1438A01G13/0275C08J3/226C08J5/18C08J2367/02C08J2367/04C08J2369/00C08J2403/02C08J2433/04C08J2463/00C08J2467/02C08J2467/04C08J2467/06C08J2469/00C08J2471/02C08J2475/14C08J2497/02C08K3/04C08K5/053C08K5/20C08K13/02C08K2003/2241Y02A40/28
Inventor 苑会林胡东良石岩邵铭泉
Owner 北京惠林苑生物科技有限公司
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