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A heat-resistant polylactic acid fiber and its preparation method

A polylactic acid fiber, heat-resistant technology, applied in the field of fiber materials, can solve problems such as material performance deterioration, and achieve the effects of improving heat resistance, reducing pollution, and improving stereo crystallization

Active Publication Date: 2017-04-12
ZHEJIANG HISUN BIOMATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual process, the homopolymerization crystallization and stereo crystallization of PLA have the possibility of simultaneous occurrence, once this happens, the performance of the material will be seriously degraded

Method used

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  • A heat-resistant polylactic acid fiber and its preparation method
  • A heat-resistant polylactic acid fiber and its preparation method
  • A heat-resistant polylactic acid fiber and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0019] Molecule A grafted poly-L-lactic acid copolymer in Examples 1 to 5 can be prepared by the following method:

[0020] Add poly L-lactic acid, molecule A and free radical initiator into a high-speed mixer and pre-mix evenly, then add it to a twin-screw extruder for melt extrusion and granulation. The melt extrusion temperature is 170°C-220°C to obtain the corresponding Molecule A grafted poly-L-lactic acid copolymer.

[0021] The specific consumption of each raw material in the present embodiment 1~5 is according to the weight ratio in the following table 1:

[0022] Table 1:

[0023]

[0024] In the above table 1:

[0025] The number average molecular weight of PLLA is 5×10 4 ~5×10 5 ;

[0026] BPO means dibenzoyl peroxide;

[0027] DCP means dicumyl peroxide;

[0028] dTBP represents di-tert-butyl peroxide;

[0029] AAc means acrylic acid;

[0030] AA1 represents allyl alcohol;

[0031] MAH stands for maleic acid.

Embodiment 6-10

[0033] Molecule B grafted poly-D-lactic acid copolymer in Examples 6-10 can be prepared by the following method:

[0034] Add poly D-lactic acid, molecule B and free radical initiator to a high-speed mixer and pre-mix evenly, then add it to a twin-screw extruder for melt extrusion and granulation. The melt extrusion temperature is 170 ° C ~ 220 ° C to obtain the corresponding Molecule B grafted poly-L-lactic acid copolymer.

[0035] The specific consumption of each raw material among the present embodiment 6~10 is according to the weight ratio in the following table 2:

[0036] Table 2:

[0037]

[0038] In Table 2 above:

[0039] The number average molecular weight of PDLA is 5×10 4 ~5×10 5 ;

[0040] BPO means dibenzoyl peroxide;

[0041] DCP means dicumyl peroxide;

[0042]dTBP represents di-tert-butyl peroxide;

[0043] GMA means glycidyl methacrylate;

[0044] TAI stands for 2-propenyl (3-isocyanato-4-methyl)phenylcarbamate.

Embodiment 11

[0046] An acrylic acid grafted poly-D-lactic acid copolymer, the specific preparation method of the copolymer is consistent with that of Example 1, and will not be repeated here, the only difference is that the PLLA in Example 1 is replaced with PDLA to obtain the corresponding acrylic acid Grafted poly-D-lactic acid copolymer.

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Abstract

The invention relates to a thermal resistant polylactic acid fiber and a preparation method thereof, and belongs to the technical field of fiber materials. The problem of how to increase the contact probability between PLLA and PDLA molecules is solved, the effect of high thermal resistance is achieved. The fiber is mainly composed of molecule A or molecule B grafted poly L-lactic acid copolymer and molecule A or molecule B grafted poly D-lactic acid copolymer, when grafting molecules in the grafted poly L-lactic acid copolymer and the poly D-lactic acid copolymer are different, the grafting molecules are molecules A or molecules B, and the molecules A are selected from molecules containing double bonds and hydroxide groups or anhydride; the molecules B are selected from molecules containing double bonds, epoxy groups and isocyanate groups. The method comprises the steps that the raw materials are mixed and put into a spinning machine to conduct melt spinning, and the thermal resistant polylactic acid fiber is obtained; higher thermal resistance and melting enthalpy effects are achieved, and the method is simple.

Description

technical field [0001] The invention relates to a heat-resistant polylactic acid fiber and a preparation method thereof, belonging to the technical field of fiber materials. Background technique [0002] In the past two decades, with the development of petrochemical polymer materials, while bringing convenience to people, their non-degradable characteristics have also brought about serious ecological and environmental problems. The emergence of degradable plastics provides the most thorough solution to this problem. Among them, degradable plastics represented by polylactic acid (PLA) have similar performance to ordinary non-degradable plastics, and can be decomposed into small molecular substances that are harmless to the environment in a short period of time after being discarded. However, although, in the field of degradable fibers, PLA can be spun in an ordinary melt spinning machine, the performance of its fibers is relatively close to that of polyester fibers, but even...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F8/10D01F8/14
Inventor 边新超刘焱龙孙彬项盛冯立栋梁伟丁伟伟朱荣华
Owner ZHEJIANG HISUN BIOMATERIALS
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