Polylactic Acid Resin Composition Wet Pulverization Nucleating Agent
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Solution Overview
Problem
Conventional methods for producing polylactic acid resin compositions fail to achieve fast crystallization velocities, excellent molding workability at low temperatures, and sufficient heat resistance, which are essential for expanded applications such as automobile parts, where the polylactic acid resin compositions need to match the performance of petroleum-based resins like polypropylene.
Innovation Solution
A method involving the blending and melt-kneading of polylactic acid resin with a finely pulverized organic crystal nucleating agent composition, where the organic crystal nucleating agent is subjected to wet pulverization in the presence of carboxylic acid esters or phosphoric esters with specific molecular weights and viscosities, resulting in enhanced crystallization velocity, molding workability, and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a crystal nucleating agent is blended in the polylactic acid resin to improve crystallization rate, then the crystallization velocity is improved, but the productivity is worsened due to long crystallization time
Solution Approach 1:
The patent changes the physical and chemical parameters of the crystal nucleating agent by controlling its particle size (0.1-10 μm) and surface properties through wet pulverization with specific esters. This optimization of parameters enables faster crystallization velocity while reducing the overall crystallization time required, thereby improving productivity.
Solution Approach 2:
The patent introduces specific ester compounds (carboxylic acid esters with molecular weight 150-600 or phosphoric esters with molecular weight 150-600 and viscosity 1-500 mPa·s) as intermediary substances during wet pulverization. These esters act as mediators that facilitate the formation of fine crystal nucleating agent particles, enhancing crystallization kinetics without compromising productivity.
2Speed
If conventional crystal nucleating agents are used to improve crystallization velocity, then crystallization rate is improved, but heat resistance and molding workability at low temperatures are insufficient
Solution Approach 1:
The patent creates a composite system by combining polylactic acid resin with specifically processed crystal nucleating agents that have been wet pulverized in the presence of ester compounds. This composite approach results in a resin composition that simultaneously achieves fast crystallization velocity, improved heat resistance, and better molding workability at low temperatures.
Solution Approach 2:
The patent optimizes multiple parameters of the crystal nucleating agent including particle size (0.1-10 μm), surface chemistry, and interaction with the resin matrix through controlled wet pulverization. These parameter changes enable the nucleating agent to enhance crystallization velocity while also improving thermal stability and low-temperature processability.
3Adaptability or versatility
If polylactic acid resin is used to replace petroleum-based resins, then environmental sustainability is improved, but molding workability and heat resistance are worsened
Solution Approach 1:
The patent uses ester compounds (carboxylic acid esters or phosphoric esters with specific molecular weights and viscosities) as intermediary substances during the wet pulverization process. These esters mediate between the polylactic acid resin and the crystal nucleating agent, enabling the resin to achieve both environmental sustainability and improved molding workability through enhanced crystallization control.
Solution Approach 2:
The patent develops a composite resin composition combining polylactic acid resin with optimally processed crystal nucleating agents. This composite material maintains the environmental benefits of biodegradable polylactic acid while significantly improving molding workability, heat resistance, and processability through the synergistic effects of the composite components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The resulting polylactic acid resin composition exhibits improved crystallization velocity, molding workability at lower temperatures, and excellent heat resistance, making it suitable for diverse applications including automobile parts, while maintaining compatibility with polylactic acid resin.
Implementation Method 1
subjecting an organic crystal nucleating agent to a wet pulverization in the presence of a carboxylic acid ester having a weight-average molecular weight of from 150 to 600 and a viscosity at 23° C. of from 1 to 500 mP·s, and/or a phosphoric ester having a weight-average molecular weight of from 150 to 600 and a viscosity at 23° C. of from 1 to 500 mPa·s
Implementation Method 2
the polylactic acid resin has a slow crystallization velocity, so that if crystallization is carried out, a long time period is required
Implementation Method 3
a technique of improving a crystallization rate by blending a crystal nucleating agent or the like in the polylactic acid resin has become known
Implementation Method 4
blending and melt-kneading a raw material for a polylactic acid resin composition containing a polylactic acid resin and a crystal nucleating agent
Data Source
AI summary
A method for producing a polylactic acid resin composition, including the following steps (1) and (2): step (1): subjecting an organic crystal nucleating agent to a wet pulverization in the presence of a carboxylic acid ester having a weight-average molecular weight of from 150 to 600 and a viscosity at 23° C. of from 1 to 500 mPa·s and/or a phosphoric ester having a weight-average molecular weight of from 150 to 600 and a viscosity at 23° C. of from 1 to 500 mPa·s to give a finely pulverized organic crystal nucleating agent composition; and step (2): melt-kneading a raw material for a polylactic acid resin composition comprising the finely pulverized organic crystal nucleating agent composition obtained in the step (1) and a polylactic acid resin.