Nucleating Agent Composition for Thermoplastic Resin Fluidity and Transparency
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Solution Overview
Problem
Thermoplastic resins, particularly olefin-based resins, face challenges with poor molding cycle characteristics, low transparency, and insufficient strength due to high crystallinity, which existing nucleating agents like aluminum hydroxybis[2,2'-methylene-bis(4,6-di-tert-butylphenyl)phosphate] and sodium stearate combinations fail to adequately address, and aromatic phosphate metal salts exhibit poor fluidity.
Innovation Solution
A composition with specific ratios of aromatic phosphate metal salts, sodium carboxylates, fatty acid metal salts, and fatty acids, ranging from 35 to 75%, 10 to 40%, 0 to 20%, and 5 to 35% by mass respectively, is used to enhance fluidity, transparency, and physical properties in thermoplastic resin compositions, particularly for polypropylene, incorporating additives like antioxidants and nucleating agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional nucleating agents (aluminum hydroxybis[2,2'-methylene-bis(4,6-di-tert-butylphenyl)phosphate] and sodium stearate) are used, then crystallization temperature is improved, but fluidity deteriorates
Solution Approach 1:
The patent uses a composite nucleating agent system comprising aluminum hydroxybis[2,2'-methylene-bis(4,6-di-tert-butylphenyl)phosphate], sodium stearate, and fatty acid in specific combinations. This composite approach allows the components to work synergistically, where the fatty acid modifies the interaction between the nucleating agents and polymer chains, improving fluidity while maintaining the crystallization-promoting effect of the other components.
Solution Approach 2:
The patent optimizes the composition ratios of the nucleating agent components, specifically controlling the content of fatty acid between 1-10 parts by mass, sodium stearate between 1-10 parts by mass, and aluminum hydroxybis[2,2'-methylene-bis(4,6-di-tert-butylphenyl)phosphate] between 0.1-5 parts by mass. By adjusting these parameters, the patent achieves both improved fluidity and maintained crystallization temperature.
2Strength
If high crystallinity is achieved, then strength is improved, but transparency deteriorates
Solution Approach 1:
The patent promotes the formation of fine crystals through the nucleating agent system, creating a uniform distribution of small crystalline structures throughout the polymer matrix. This local refinement of crystal structure allows the material to maintain high strength from the crystalline regions while preserving transparency by avoiding large crystal formations that would scatter light.
Solution Approach 2:
The composite nucleating agent system works synergistically to control crystal morphology and size distribution, enabling the simultaneous achievement of high strength and transparency through optimized crystallization behavior.
3Productivity
If fast crystallization is achieved, then molding cycle characteristics are improved, but crystal size increases
Solution Approach 1:
The patent controls the nucleating agent composition and ratios to optimize crystallization kinetics, achieving rapid crystallization at moderate temperatures without excessive crystal growth. The specific parameter ranges for each component are designed to balance crystallization speed with crystal size control.
Solution Approach 2:
By promoting numerous nucleation sites throughout the material, the system creates many small crystals rather than few large ones, achieving fast overall crystallization while maintaining fine crystal morphology.
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 composition significantly improves the fluidity, transparency, and impact strength of molded articles while suppressing coloration, achieving a balance of physical properties and optical clarity.
Implementation Method 1
it is known that the above-described problems are solved by increasing the crystallization temperature of each olefin-based resin and thereby allowing the olefin-based resin to generate fine crystals rapidly
Implementation Method 2
add a nucleating agent for this purpose
Data Source
AI summary
Provided are: a composition capable of imparting excellent transparency and physical properties to thermoplastic resins; a thermoplastic resin composition containing the composition; and a molded article of the thermoplastic resin composition. The composition contains the following (A), (B), (C) and (D), and ratios of respective components with respect to a total amount of (A) to (D) are: (A) 35 to 75% by mass, (B) 10 to 40% by mass, (C) 0 to 20% by mass, and (D) 5 to 35% by mass. The (A) is an aromatic phosphate metal salt represented by the following Formula (1) wherein, R1 to R4 each independently represent a hydrogen atom or the like; R5 represents an alkylidene group having 1 to 4 carbon atoms; m represents a number of 1 or 2; when m is 1, M1 represents lithium; and when m is 2, M1 represents hydroxyaluminum, the (B) is a sodium carboxylate, the (C) is a fatty acid metal salt represented by the following Formula (2) wherein, R6 represents a group introduced to an aliphatic organic acid having 10 to 30 carbon atoms; M2 represents an n-valent metal atom or the like; and n represents an integer of 1 to 3, and the (D) is a fatty acid.