PLA (polylactic acid) modified material, preparation method thereof and PLA biodegradable mulching film

A modified material and modified technology, applied in the field of biodegradable materials, can solve the problems of limited application fields and poor flexibility of polylactic acid, and achieve the effects of improving flexibility, high strength, and broadening the scope of use

Active Publication Date: 2014-04-09
ANHUI JUMEI BIOLOGICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the relatively poor flexibility of polylactic acid, its application in the field of film has been greatly limited.

Method used

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  • PLA (polylactic acid) modified material, preparation method thereof and PLA biodegradable mulching film

Examples

Experimental program
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Effect test

preparation example Construction

[0024] In the preparation method, preferably, the mixing method includes: first mixing the PLA, the PBAT and the modified talc, and then mixing the obtained mixture with the antioxidant, the The ultraviolet absorber, the light stabilizer, the blocking agent, the chain extender and the initiator are mixed.

[0025] In the preparation method, in order to make the prepared composition have better properties and ensure that the preparation method is more effective, preferably, the method further comprises mixing the PLA, the PBAT and the modified compound before mixing. The talc powder is dried, and the temperature of the drying treatment is 80-110° C. and the time is 1-3 hours.

[0026] In the preparation method, preferably, the pelletizing process is carried out in a twin-screw extruder, the length to diameter ratio of the twin-screw extruder is 35-50:1, and the twin-screw extruder is extruded The temperature of the machine is 165-185℃.

[0027] The present invention also provid...

Embodiment 1

[0038] 65 parts by weight of poly-L-lactic acid, 30 parts by weight of PBAT and 2 parts by weight of 7800 mesh modified talc (modified talc is 1.99 parts by weight of 7800 mesh talc and 0.005 parts by weight of stearic acid and The mixture of 0.005 parts by weight of sodium stearate was obtained by mixing at 25 ° C) and dried at 90 ° C for 1.5 hours; the poly-L-lactic acid, PBAT and modified talc after the above drying treatment were placed at room temperature. After cooling, with 0.4 parts by weight of tetrakis [beta-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester, 0.1985 parts by weight of 2-hydroxy-4-n-octyloxydibenzyl Ketone, 0.4 part by weight of succinic acid and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidinol, 1 part by weight of erucamide, 0.5 part by weight of oleic acid amide , 0.5 parts by weight of the chain extender numbered as ADR-4368 and 0.0015 parts by weight of benzoyl peroxide are mixed, and the mixture M1 is obtained by mixing; A twin...

Embodiment 2

[0040] 70 parts by weight of poly-D-lactic acid, 24.5 parts by weight of PBAT and 0.8 parts by weight of 7800 mesh modified talc (modified talc powder is 0.798 parts by weight of 7800 mesh talc and 0.001 parts by weight of stearic acid and 0.001 parts by weight of the mixture of calcium stearate was mixed) and dried at 80 ° C for 1 hour; the poly-D-lactic acid, PBAT and modified talc after the above drying treatment were placed at room temperature and cooled with 0.9 Tris (2,4-di-tert-butylphenyl) phosphite in parts by weight, 0.499 parts by weight of 2-hydroxy-4-n-octyloxybenzophenone, 1.2 parts by weight of succinic acid and 4-hydroxyl -polymer of 2,2,6,6-tetramethyl-1-piperidinol, 1.8 parts by weight of polyethylene wax, 0.3 parts by weight of chain extender numbered ADR-4370S and 0.001 parts by weight of peroxide Diisopropylbenzene is mixed, and the mixture M1 is obtained by mixing evenly; the mixture M1 is granulated through a twin-screw extruder with a length-to-diameter...

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Abstract

The invention discloses a PLA (polylactic acid) modified material, a preparation method thereof and a PLA biodegradable mulching film. The modified material contains the following raw materials in percentage by weight: 58-80wt% of PLA, 15-40wt% of PBAT (poly(butylene adipate-co-terephthalate)), 0.1-5wt% of modified talcum powder, 0.1-2wt% of antioxidant, 0.1-1wt% of ultraviolet absorption agent, 0.1-2wt% of light stabilizer, 0.1-2wt% of antiblocking agent, 0.1-1wt% of chain extender and 0.0005-0.05wt% of initiator. The PBAT is added into the PLA, and meanwhile the chain extender is used to compatibilize the polymer, so that the prepared material keeps the characteristics of high strength, high transmittancy and high cost performance of the PLA after blow molding and film forming, and meanwhile, the flexibility is enhanced.

Description

technical field [0001] The present invention relates to biodegradable materials, in particular, to a PLA modified material, a preparation method thereof, and a PLA biodegradable mulch film. Background technique [0002] At present, mulch film has been widely used in the agricultural field of various countries, and has received much attention for its unique functions of heat preservation, moisture retention, moisture preservation, fertilizer increase, and yield increase. The annual use of plastic film in my country exceeds 1 million tons, and the materials of these plastic films are basically traditional petroleum-based materials such as PE. These materials will be left in the soil after being used and discarded, causing serious white pollution, which is not conducive to my country's agriculture. sustainable development. [0003] As a new type of biodegradable material, polylactic acid (PLA) is made from renewable plant resources, such as corn starch. After being used, it ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L67/02C08K13/06C08K9/06C08K9/04C08K3/34
Inventor 王凤洋马腾
Owner ANHUI JUMEI BIOLOGICAL TECH
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