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Plasticizing and modifying method for polylactic acid

A technology of toughening modification and toughening modifier, which is applied in the field of polylactic acid and polylactic acid blending modification, can solve the problems of the influence of the biodegradation performance of the mixture, the low utilization rate of renewable materials, and the reduction of practical use significance. , to achieve the effect of significant toughening effect, wide range of options, and simple and easy operation.

Inactive Publication Date: 2008-04-30
中国石化仪征化纤股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The toughness of this ternary mixture is better, but wherein the content of polylactic acid is lower than 30wt%, the biodegradability of the mixture is affected, the utilization rate of renewable materials is not high, and the practical use significance is reduced

Method used

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  • Plasticizing and modifying method for polylactic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: the preparation of copolyester

[0020] Using PET industrial equipment, during the esterification reaction or polycondensation reaction of terephthalic acid and ethylene glycol monomers,

[0021] (1) Add a mixture of isophthalic acid, hexamethylenediamine, 1,4-cyclohexanedimethanol, and polyethylene glycol with a number average molecular weight of 200 to 4000 as a modification additive, and add it to the reaction system to generate 1 # Modified copolyester;

[0022] (2) Add an appropriate amount of 1,4 cyclohexanedimethanol to obtain 2 # Modified copolyester;

[0023] (3) still use 1,4 cyclohexane dimethanol as the third monomer, change the addition amount, obtain 3 # Modified copolyester;

[0024] (4) Add a mixture of isophthalic acid, 1,4-cyclohexanedimethanol, and polyethylene glycol with a number average molecular weight of 200 to 4,000 as a modification additive, and add it to the reaction system to generate 4 # Modified copolyester.

[0025] 1 ...

Embodiment 2

[0028] Embodiment 2: blank test

[0029] 2500g of polylactic acid resin (trade name: NatureWorks PLA 2002D, the same below) was dried at 90-110°C for 6 hours, so that the moisture content was lower than 50ppm, and melted and extruded by a screw extruder and injected to obtain a test sample. Test its tensile properties, bending properties and impact strength. The test results are shown in Table 2.

Embodiment 3

[0030] Example 3: 1 # Copolyester Toughened PLA (Part 1)

[0031] With 2475g polylactic acid resin and 25g copolyester (1 # ) were uniformly mixed with a high-speed mixer, dried at 90-110°C for 6 hours, so that the moisture content was lower than 50ppm, melted and extruded by a screw extruder and injected to obtain a test sample, and its tensile and bending properties were tested and impact strength.

[0032] The test results are shown in Table 2.

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Abstract

The invention provides a toughening modification method of polylactic acid. The polylactic acid and toughening modifier are mixed according to the proportion and are dried to lead the moisture content percentage to be lower than 50 ppm, then a melting extrusion method is adopted to mould the polylactic acid and the toughening modifier into a product, wherein, the toughening modifier is copolyester with melting point in 125 to 200 DEG C, in particular is the copolyester obtained by adopting isophthalic acid, hexanediamine, 1,4-butanediol, etc. as third monomers to modify PET. When blending, the quantity of the copolyester accounts for 1 to 20 Wt percent of the quantity of the polylactic acid, the melting extrusion processing temperature is 180 to 240 DEG C, and the breaking elongation of the obtained injection molding spline is improved by 10 to 300 percent. The invention greatly makes up for the disadvantage of deficient toughness of PLA, so as to lead the processing property to be improved greatly.

Description

technical field [0001] The polylactic acid of the present invention particularly relates to the blending modification of polylactic acid, especially for toughening and modifying polylactic acid, and belongs to the technical field of polymer blending modification. Background technique [0002] Polylactic acid (PLA) is a biodegradable synthetic polymer with good biocompatibility and safety. It is non-toxic and harmless to the human body. It can be gradually degraded in the body and in the natural environment, and finally decomposed into carbon dioxide. and water. Therefore, the industrialization prospect of polylactic acid is promising, and it can replace traditional materials, and is widely used in medical, pharmacy, agriculture, packaging, clothing and other fields. [0003] It has been found that the thermoplastic polylactic acid resin used as packaging materials has a high modulus of elasticity, and the corresponding thermoformed products have high rigidity, and thermopla...

Claims

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Application Information

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IPC IPC(8): C08L67/03C08G63/46B29C47/92B29C48/92
CPCB29C48/92B29C2948/92704B29C2948/92895
Inventor 李乃祥巢平翟丽鹏
Owner 中国石化仪征化纤股份有限公司
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