Hydroxymethyl acrylamide-acrylate copolymer toughened and modified polylactic acid material and preparation method thereof

A technology of methylolacrylamide and polylactic acid materials, applied in the field of toughened modified polylactic acid materials and their preparation, can solve the problems of inapplicability, opacity, poor extensibility of microporous materials, etc., and achieve fast polymerization reaction, The effect of short production cycle and easy industrial promotion and application

Inactive Publication Date: 2012-01-11
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the micropore size and distribution are controlled within a certain range, although the material can be significantly toughened, the extensibility of the microporous material is not good, and most of them are opaque, so they are not suitable for transparent films and packaging.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Stir and mix methylol acrylamide and butyl acrylate in a weight ratio of 1:40, and 0.1% azobisisobutyronitrile based on the total weight of the reaction monomers, and polymerize at 60°C for 1.5 hours, that is Obtain number-average molecular weight and be 18,000 copolymer toughening agents; The number-average molecular weight after drying is 80,000 PLA92 parts and 8 parts of copolymer toughening agents are premixed, then premix is ​​put into internal mixer, The toughened and modified PLA material can be obtained by melting and masticating for 5 minutes at a masticating temperature of 170°C.

[0030] The tensile strength of the material is 40Mpa, the elongation at break is 150%, and the Izod impact strength is 7KJ / m 2 .

Embodiment 2

[0032] Stir and mix methylolacrylamide and ethyl acrylate in a weight ratio of 1:40, and 2.0% azobisisobutyronitrile based on the total weight of the reaction monomers, and polymerize at 60°C for 2.0 hours, that is Obtain the copolymer toughening agent that the number average molecular weight is 23,000; Premix 92 parts of PLA and 8 parts of copolymer toughening agent that the number average molecular weight is 100,000 after drying, then put the premix into the twin-screw extruder Medium-melt plasticizing extrusion, so that the melt temperature of extrusion granulation is 170 ° C, to obtain toughened modified PLA material.

[0033] The tensile strength of the material is 47Mpa, the elongation at break is 80%, and the Izod impact strength is 6.5KJ / m 2 .

Embodiment 3

[0035] Stir and mix methylol acrylamide and butyl acrylate in a weight ratio of 1:30, and 0.5% azobisisobutyronitrile based on the total weight of the reaction monomers, and polymerize at 70°C for 2.5 hours, that is Obtain the copolymer toughening agent that the number average molecular weight is 35,000; Premix 95 parts of PLA and 5 parts of copolymer toughening agent that the number average molecular weight is 150,000 after drying, then put the premix into the twin-screw extruder Medium-melt plasticizing extrusion, so that the melt temperature of extrusion granulation is 170 ° C, to obtain toughened modified PLA material.

[0036] The tensile strength of the material is 50Mpa, the elongation at break is 50%, and the Izod impact strength is 5KJ / m 2 .

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Abstract

The invention discloses a hydroxymethyl acrylamide-acrylate copolymer toughened and modified polylactic acid material and a preparation method thereof. The hydroxymethyl acrylamide-acrylate copolymer serving as a toughening agent accounts for 5 to 15 percent of the weight of the material; and the material is a transparent material of which the tensile strength is 36 to 50Mpa, the breaking elongation is 40 to 350 percent, and the Izod impact strength is 5 to 17KJ / m<2>. The invention also discloses a method for preparing the polylactic acid material. Because the hydroxymethyl acrylamide-acrylate copolymer serving as the toughening agent can form a fine granular disperse phase in polylactic acid to play a role in toughening similar to rubber particles, the material has the advantages of small additive amount, high toughening efficiency, little influence on the strength, high machining flowability, transparency, rigidity and heat resistance, quick polymerization reaction, short productioncycle, simple process control, low cost and easy industrial popularization and application.

Description

technical field [0001] The invention belongs to the technical field of toughened modified polylactic acid material and its preparation, and in particular relates to a polylactic acid material toughened and modified with methylol acrylamide and acrylate copolymer and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) is a renewable biomass polymer. It is first fermented from native starch to obtain lactic acid, and then further synthesized from lactic acid to obtain a high polymer. PLA can finally be decomposed into CO in the environment. 2 and H 2 O, will not cause pollution and damage to the environment, therefore, PLA is considered to be an environmentally friendly and fully degradable polymer material. However, due to poor thermal stability, poor heat resistance, high cost, poor toughness, and brittleness of pure polylactic acid, the promotion and application in electronic products such as disposable appliances, packaging film bags, labels,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L33/08C08F220/18C08F220/58B29B9/06
Inventor 吴智华陈龙孟兵邓晶晶刘庆
Owner SICHUAN UNIV
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