Method and application of reducing polylactic acid melt viscosity

A technology of melt viscosity and polylactic acid, which is applied in the field of reducing melt viscosity in the melting process of polylactic acid, can solve the problems of thermal stability restriction, increase processing temperature, influence on mechanical properties, etc., and achieve short melt processing time, Reduce melt viscosity and require simple effects

Active Publication Date: 2018-08-17
中知在线股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the use of plasticizers can significantly improve the melt processing fluidity of polymers, the mechanical properties of the products will be negatively affected, and as time goes by, the migration of plasticizers will also occur and affect the use of the products properties; simply increasing the processing temperature is constrained by the thermal stability of the polymer material being processed
Therefore, these traditional technical methods for improving the flowability of polymer melt processing always inevitably lose some properties of the material in some aspects. A new technology that can overcome the shortcomings of traditional methods at the same time

Method used

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  • Method and application of reducing polylactic acid melt viscosity
  • Method and application of reducing polylactic acid melt viscosity
  • Method and application of reducing polylactic acid melt viscosity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 62g of PLA, by volume, the added volume of silica is 0.1% of the volume of polylactic acid, weigh silica filler R974, dry at 60°C for 24 hours, put it into XSS-30 with temperature set at 170°C In the mixing chamber of the torque rheometer, set the rotational speed at 32 rpm, melt and process for 15 minutes, take out the sample and cool it to room temperature 20-25 degrees Celsius to obtain PLA / R0.1%.

Embodiment 2

[0029] Take 62g of PLA, by volume, the added volume of silica is 0.3% of the volume of polylactic acid, weigh silica filler R974, dry at 60°C for 24 hours, put it into XSS-30 with temperature set at 170°C In the mixing chamber of the torque rheometer, set the rotational speed at 32 rpm, melt and process for 15 minutes, take out the sample and cool it to room temperature 20-25 degrees Celsius to obtain PLA / R0.3%.

Embodiment 3

[0031] Take 62g of PLA, by volume, the added volume of silica is 0.5% of the volume of polylactic acid, weigh silica filler R974, dry at 60°C for 24 hours, put it into XSS-30 with temperature set at 170°C In the mixing chamber of the torque rheometer, set the rotational speed at 32 rpm, melt and process for 15 minutes, take out the sample and cool it to room temperature 20-25 degrees Celsius to obtain PLA / R0.5%.

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Abstract

The invention discloses a method for reducing viscosity of polylactic acid melt and an application thereof. According to the invention, polylactic acid and silica particles are blended until the silica particles are uniformly distributed in polylactic acid, metered by volume, addition volume of silica accounts for 0-1% of that of polylactic acid, the hydroxy on the surface of silica is partially substituted by methyl group, metered by mole, the substitution proportion of the methyl group is more than or equal to 50%; the silica particles are in a spherical shape, and the diameter is 10-30 nm. The method can effectively reduce the melt viscosity, has little influence on mechanical properties, and can increase the modulus or intensity of polylactic acid.

Description

technical field [0001] The invention belongs to the field of material preparation, in particular to a method for reducing the melt viscosity of polylactic acid during melt processing. Background technique [0002] Polylactic acid (PLA) is a biodegradable polymer widely used in packaging materials and biomedical fields. The melt viscosity of polylactic acid during melt processing has an important influence on the molding and final properties of the material. Effectively reducing the melt processing viscosity without reducing other application properties of the material can not only effectively avoid the damage of polylactic acid due to thermal stability problems during melt processing, but also reduce processing energy consumption while ensuring the precision of product processing. Especially for polylactic acid, a biodegradable and promising polymer, it is of great significance to improve its processing performance. [0003] In terms of reducing the viscosity of polymer ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08K9/00C08K7/18
CPCC08K7/18C08K9/00C08K2201/003C08K2201/011C08L67/04
Inventor 李景庆李志浩蒋世春尚英瑞
Owner 中知在线股份有限公司
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