Unlock instant, AI-driven research and patent intelligence for your innovation.

High-tensile toughness polylactic acid and preparation method thereof

A polylactic acid and toughness technology, applied in the field of high tensile toughness polylactic acid and its preparation, can solve the problems of low elongation at break, difficulty in meeting the toughness requirements of packaging materials, poor ductility of polylactic acid, etc., and achieve improved processing performance, high Promote the application value and the effect of simple equipment

Active Publication Date: 2017-12-01
DALIAN UNIV OF TECH
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polylactic acid has poor ductility and extremely low elongation at break, and it is difficult to meet the toughness requirements of packaging materials when used alone

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Take 70 parts of L-polylactic acid and 30 parts of epoxidized styrene-butadiene transparent impact resin SBC, and mix polylactic acid and epoxidized SBC in an internal mixer for 10 minutes at a temperature of 170°C and a torque of 60rpm , to obtain polylactic acid with high tensile toughness, the elongation at break is 305.0%; in comparison, the elongation at break of L-polylactic acid 4032D is 3.5%; while L-polylactic acid 4032D is mixed with SBC under the same ratio Blending modification, the elongation at break of the toughened product is only 7.5%. It can be seen that the toughening effect of epoxidized SBC is more significant.

[0017] The number-average molecular weight of the above-mentioned L-polylactic acid is 116,000; the number-average molecular weight of the above-mentioned epoxidized styrene-butadiene transparent impact resin SBC is 104,000, wherein the content of butadiene is 32wt%, and the molar percentage of the degree of epoxidation is 28.8 %.

Embodiment 2

[0019] Take 70 parts of L-polylactic acid and 30 parts of epoxidized styrene-butadiene transparent impact resin SBC, and mix polylactic acid and epoxidized SBC in an internal mixer for 15 minutes at a temperature of 180°C and a torque of 80rpm , to obtain polylactic acid with high tensile toughness, and the elongation at break was 247.5%.

[0020] The number-average molecular weight of the above-mentioned L-polylactic acid is 116,000; the number-average molecular weight of the above-mentioned epoxidized styrene-butadiene transparent impact resin SBC is 104,000, wherein the content of butadiene is 32wt%, and the molar percentage of the degree of epoxidation is 23.9 %.

Embodiment 3

[0022] Take 50 parts of L-polylactic acid and 50 parts of epoxidized styrene-butadiene transparent impact resin SBC, and mix polylactic acid and epoxidized SBC in an internal mixer for 20 minutes at a temperature of 195°C and a torque of 40rpm , to obtain polylactic acid with high tensile toughness, and the elongation at break was 320.1%.

[0023] The number-average molecular weight of the above-mentioned L-polylactic acid is 116,000; the number-average molecular weight of the above-mentioned epoxidized styrene-butadiene transparent impact resin SBC is 104,000, wherein the content of butadiene is 32wt%, and the molar percentage of epoxidation degree is 15.7 %.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
elongation at breakaaaaaaaaaa
elongation at breakaaaaaaaaaa
elongation at breakaaaaaaaaaa
Login to View More

Abstract

The invention provides high-tensile toughness polylactic acid and a preparation method thereof. The high-tensile toughness polylactic acid is obtained by toughening and modifying polylactic acid by adopting epoxidized transparent butadiene-styrene impact-resistant resin through a banburying, blending and grafting method, and putting the polylactic acid and the epoxidized transparent butadiene-styrene impact-resistant resin in a banbury mixer, wherein in 100 parts by mass of the high-tensile toughness polylactic acid, the content of the epoxidized transparent butadiene-styrene impact-resistant resin is 5 to 50 parts and is preferably 10 to 40 parts, and the balance is the polylactic acid; the banbury mixing time is 5 to 20 minutes, the banbury mixing temperature is 170 to 200 DEG C, the torque is 40 to 80 rpm. The preparation method disclosed by the invention is simple, efficient and easy to operate, the production cost is low, and higher promotion and application value is obtained; the prepared high-tensile toughness polylactic acid has the advantages that the tensile toughness is remarkably improved while good biodegradable characteristics are maintained.

Description

technical field [0001] The invention relates to a kind of polylactic acid with high tensile toughness and a preparation method thereof, relates to toughening and modifying polylactic acid by adopting epoxidized styrene-butadiene transparent impact resin, and belongs to the technical field of polymer material modification. Background technique [0002] Polylactic acid is a thermoplastic material that has been commercially produced. The source of raw materials is renewable. It has good biocompatibility and biodegradability. It can be gradually degraded in the human body and the natural environment, and finally decomposed into carbon dioxide and water. Polylactic acid is the most promising biological material to replace traditional petroleum-based polymer materials in the future, and it is widely used in medical, pharmaceutical, agricultural, packaging and other fields. Polylactic acid has good food contact safety and air permeability. Whether it is in the field of industrial p...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L53/02C08G81/02B29B7/28
CPCB29B7/283B29B7/286C08G81/027C08L53/025C08L67/04C08L2201/06
Inventor 王艳色李杨魏志勇冷雪菲牛慧
Owner DALIAN UNIV OF TECH