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High-strength polylactic acid microporous foam material and preparation method thereof

A technology of microcellular foam and polylactic acid, which is applied in the field of high-strength polylactic acid microcellular foam material and its preparation, can solve the problems of difficult mechanical strength and limited reinforcement effect, and achieve the effects of low density, remarkable reinforcement effect and convenient recycling.

Active Publication Date: 2022-03-22
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the above-mentioned common modification methods can improve the foaming behavior of polylactic acid and the mechanical properties of the foam to a certain extent, the strengthening effect is still relatively limited, and it is difficult to achieve a double increase in its mechanical strength.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 0.5 parts of ethylene glycol dihydrate, 0.25 parts of p-xylenedic acid dna, 0.25 parts of 1,6-adipanoisocyanate, 10 parts of polycaprolactone together with 100 parts of polylactic acid, in 170 20 min was reacted at ° C to obtain a polylactic acid base block polymer having a long chain branching structure; the polylactic acid base block polymer was suppressed molded, and the size was 30 × 5 × 1 mm. 3 The sample sheet, the suppression temperature is 170 ° C, the pressing pressure is 10 MPa, and then the sample is fixed on the stretching device of the controllable temperature regular speed, and the temperature is 10 min at 70 ° C, then the tensile orientation is performed, the tensile rate is 10 mm / min. When the pulsed ratio of 6, stop stretching, cooling, unloading, sampling, giving oriented samples;

[0024] The alternating sample is placed in a high pressure blistering kettle at 30 ° C and filled into CO. 2 The kettle is compressed by 10 mPa and remains 0.5 h, then rapidl...

Embodiment 2

[0026] 1 part of 1,4-butanediol dihydrate glycene ether, 0.5 parts of 3, 3 ', 4,4'-biphenyl tetrahydride, 0.5 parts of 4,4'-dicyclohexahtin diisocyanate, 20 parts The polyethylene glycol is added to the mesh together with 100 parts of polylactic acid, and the polylactic acid base block polymer having a long chain branched structure is obtained at 190 ° C to obtain a polylactic acid base block polymer; a polylactic acid base block polymer is suppressed molded. , Fabricate 30 × 5 × 1 mm 3 The sample sheet, the pressing temperature is 190 ° C, the pressing pressure is 15 MPa, and then the sample is fixed on the stretching device of the controlled temperature regular speed, 20 min at 90 ° C, then carry out the tensile orientation, the tensile rate is 100 mm / min When the pulsed ratio is 8, stop stretching, cooling, unloading, sampling, giving oriented samples;

[0027] The alternating sample is placed in a high pressure blistering kettle of 40 ° C and filled with the kettle. 2The ket...

Embodiment 3

[0029] 5 pieces of ravaruferiol tetracrotional glycene ether, 2.5 parts of 3, 3 ', 4,4'-diphenone tetrahydride, 2.5 parts of L-lysine diisocyanate, 40 parts of dioxidant hexanone 100 parts of the polylactic acid together with a renewal, reacted at 220 ° C for 60 min to obtain a polylactic acid base block polymer having a long chain branching structure; the polylactic acid base block polymer is pressed, and the size is 30 × 5 × 1mm 3 The sample, the pressing temperature is 220 ° C, the pressing pressure is 20 MPa, and then the sample is fixed on the stretching device of the controllable temperature regular speed, and the temperature is 60 min at 110 ° C, and then the tensile orientation is performed, the tensile rate is 500 mm / min. When the pulsed ratio is 10, stop stretching, cooling, unloading, sampling, giving oriented samples;

[0030] The alternating sample is placed in a high pressure blistering kettle in 50 ° C and filled with the kettle body into CO. 2 The kettle is compr...

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Abstract

The invention discloses a high-strength polylactic acid microporous foam material and a preparation method thereof, and the preparation method is characterized by comprising the following steps: firstly, introducing a polymer chain link with a lower melting point and good biodegradability into a polylactic acid molecular chain through molecular design by adopting a simple, convenient and efficient macromolecular reactive processing method to prepare a long-chain branched polylactic acid-based block polymer; a two-phase separation structure with melting point difference is formed while the entanglement degree of polylactic acid molecules is increased; on the basis, a solid-phase thermal stretching combined supercritical CO2 foaming technology is utilized, and the foaming temperature (near the melting point of a low-melting-point phase) is regulated to be far lower than the stretching orientation temperature (between the melting point of a polylactic acid phase and the melting point of the low-melting-point phase); therefore, the block polymer molecules form and maintain a highly oriented crystal structure in the orientation-foaming process to obtain the high-strength polylactic acid microporous foam material.

Description

Technical field [0001] The present invention relates to a high-strength polylactic acid microporous foam material and a preparation method thereof, which belongs to a biodegradable foam material and a high molecular material processing technology. Background technique [0002] The polymer foam material has the characteristics of light, high than high strength, excellent energy absorption, etc., is widely used in construction, packaging and transportation. Currently commonly used polymer foam, such as polystyrene (PS), polypropylene (PP), etc. Chemical Energy Crisis and Ecological Environment. In order to replace the petroleum-based polymer foam, the study of green sustainable economy is achieved, and the study of biodegradable polymer foaming materials has caused widespread concern. [0003] Polylactic acid (PLA) is a biodegradable aliphatic polyester, derived from renewable resources such as corn, cassava, sorghum, due to its excellent mechanical properties, good biocompatibilit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/12C08L87/00C08G81/00C08G63/91C08G65/331C08G65/333
CPCC08J9/122C08G81/00C08G63/912C08G65/331C08G65/33351C08G65/33355C08J2387/00C08J2203/06
Inventor 赵晓文叶林
Owner SICHUAN UNIV
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