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Preparation method for high-strength high-toughness micro polylactic acid product

A technology of polylactic acid and high toughness, which is applied in the field of preparation of high-toughness and high-strength polylactic acid micro-products, can solve the problems of monomer waste, slow reaction rate, low monomer utilization rate, etc., to expand the application field and avoid crosslinking , Improve the effect of strength and toughness

Active Publication Date: 2019-11-05
SHAANXI SCI TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another commonly used method is chemical modification, which introduces long-chain branched structures into linear polylactic acid to improve its crystallization properties, such as blending polylactic acid with pyromellitic dianhydride and triglycidyl isocyanurate for chemical modification. Modification, the crystallization properties have been improved, but the melt strength has not improved significantly
Moreover, the reaction rate of the currently used chemical modification is too slow to expand production on a large scale, and the utilization rate of the monomer is too low, which to a certain extent causes the waste of the monomer
Through previous studies, it has been found that the formation of long-chain branched structure or the addition of the second part can improve the crystallization performance, toughness or strength of PLA, but cannot improve the strength and toughness of PLA products at the same time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Dry the PLA particles in vacuum at 70°C for 24 hours; put 100 parts by weight of PLA into an internal mixer for blending, the blending time is 5 minutes, the speed is 50rpm, and the processing temperature is 180°C;

[0022] 2) The blend is micro-injected using a micro-injection molding machine of the type micropower5, and the processing parameters are: the injection speed is 300 mm / s; the temperature from the barrel to the nozzle is set to 185, 180, 180, and 175 ° C; The temperature is 100°C, the shape of the spline is dumbbell-shaped, and the size is 15*3*0.3mm 3 ;

[0023] 3) In order to verify the effect of processing modification on the crystallization behavior of polylactic acid, the obtained sample was tested by DSC, first heated from 40°C to 200°C at 10°C / min, isothermal for 5min, and then heated from 200°C to 10°C / min The temperature was lowered to 40°C, and the results are shown in Table 1.

[0024] In the experiment, traditional injection molding processi...

Embodiment 2

[0026] 1) Dry the PLA particles in vacuum at 70°C for 24 hours; put 100 parts by weight of PLA, 0.06 parts by weight of TETDS and 0.3 parts by weight of DCP into an internal mixer for blending, the blending time is 5 minutes, and the speed is 50 rpm. The processing temperature is 180°C;

[0027] 2) The blend is micro-injected using a micro-injection molding machine of the type micropower5, and the processing parameters are: the injection speed is 300 mm / s; the temperature from the barrel to the nozzle is set to 185, 180, 180, and 175 ° C; The temperature is 100°C, the shape of the spline is dumbbell-shaped, and the size is 15*3*0.3mm 3 ;

[0028] 3) In order to verify the effect of processing modification on the crystallization behavior of polylactic acid, the obtained sample was tested by DSC, first heated from 40°C to 200°C at 10°C / min, isothermal for 5min, and then heated from 200°C to 10°C / min The temperature was lowered to 40°C, and the results are shown in Table 1.

...

Embodiment 3

[0031] 1) Dry the PLA particles in vacuum at 70°C for 24 hours; put 100 parts by weight of PLA, 0.06 parts by weight of TETDS, 0.3 parts by weight of DCP and 0.2 parts by weight of PEGDA into an internal mixer for blending, and the blending time is 5min, the rotation speed is 50rpm, and the processing temperature is 180°C;

[0032] 2) The blend is micro-injected using a micro-injection molding machine of the type micropower5, and the processing parameters are: the injection speed is 300 mm / s; the temperature from the barrel to the nozzle is set to 185, 180, 180, and 175 ° C; The temperature is 100°C, the shape of the spline is dumbbell-shaped, and the size is 15*3*0.3mm 3 ;

[0033] 3) In order to verify the effect of processing modification on the crystallization behavior of polylactic acid, the obtained sample was tested by DSC, first heated from 40°C to 200°C at 10°C / min, isothermal for 5min, and then heated from 200°C to 10°C / min The temperature was lowered to 40°C, and ...

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Abstract

The invention relates to the technical field of high polymer materials, in particular to a preparation method for a high-strength high-toughness micro polylactic acid product. The preparation method for the high-strength high-toughness micro polylactic acid product comprises the steps that polylactic acid, dicumyl peroxide and polyethylene glycol diacrylate are subjected to melt blending for 1-6 minutes at the temperature of 170-190 DEG C, and the micro polylactic acid product is prepared by using a micro injection molding method, wherein the weight part ratio of the polylactic acid to the dicumyl peroxide to the polyethylene glycol diacrylate is 100:0.3:(0.1-0.5); according to the micro injection molding process, the injection speed is 200-500 mm / s, the injection temperature is 170-190 DEG C, the injection pressure is 500-1200 bar, and the mold temperature is 50-100 DEG C. The polylactic acid product prepared by using the method is high in strength and toughness.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a preparation method of high-toughness and high-strength polylactic acid miniature products. Background technique [0002] With the development of science and technology, environmental pollution is becoming more and more serious. How to effectively expand the use of biodegradable plastics has become a research hotspot. Among them, polylactic acid is a degradable polymer obtained by polymerization of lactic acid as the main raw material, and has a wide range of application prospects. However, when used as a material, the brittleness of PLA itself limits its wide use, and improving the toughness of PLA has become a modification of PLA. important research directions. However, the current polylactic acid resin is mainly a linear structure, and due to its own defects (lower melt strength and crystallinity), it has been limited in many applications, such as blown film, foam...

Claims

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Application Information

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IPC IPC(8): C08G81/00C08K5/40C08L67/04C08L71/02C08K5/14B29C45/76B29C45/78B29C45/77
CPCB29C45/76B29C45/77B29C45/78B29C2945/76498B29C2945/76531B29C2945/76598C08G81/00C08K5/40C08L67/04C08L71/02C08K5/14
Inventor 赵中国贾仕奎梁文俊陈立贵付蕾
Owner SHAANXI SCI TECH UNIV
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