Nucleating Agent P/Na Ratio Polyolefin Thermal Stability
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Solution Overview
Problem
Conventional nucleating agents, such as sodium 2,2'-methylene-bis(4,6-di-tert-butylphenyl) phosphate, fail to simultaneously improve the thermal stability and transparency of polyolefin resins, often resulting in inconsistent performance.
Innovation Solution
A nucleating agent with a specific mass ratio of phosphorus to sodium (P/Na) between 1.350 and 1.500, formulated with compounds represented by specific alkyl and alkanediyl groups, is used to enhance the crystallization process of polyolefin resins, ensuring improved thermal stability and transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional nucleating agents like sodium 2,2'-methylene-bis(4,6-di-tert-butylphenyl) phosphate are used, then crystallization temperature and rigidity are improved, but thermal stability and transparency cannot be simultaneously improved
Solution Approach 1:
The invention changes the chemical composition parameters of the nucleating agent by specifying a particular ratio of sodium 2,2'-methylene-bis(4,6-di-tert-butylphenyl) phosphate to sodium bis(4-tert-butylphenyl) phosphate (within 90:10 to 10:90 by weight). This parameter adjustment enables simultaneous improvement of crystallization temperature, thermal stability, and transparency, resolving the contradiction among these properties.
2Strength
If conventional nucleating agents are used, then rigidity is improved, but transparency remains insufficient
Solution Approach 1:
The invention adjusts the compositional parameters of the nucleating agent system by defining specific weight ratios between two phosphate compounds. This parameter optimization enables the resin composition to achieve both high rigidity and high transparency simultaneously, overcoming the trade-off between these properties.
3Ease of manufacture
If olefin resins are heat-molded, then moldability is achieved, but large crystals form causing insufficient strength and poor transparency
Solution Approach 1:
The invention applies preliminary action by incorporating a specifically formulated nucleating agent system into the resin composition before molding. This pre-added nucleating agent system promotes the formation of fine crystals during the molding process, preventing the formation of large crystals that would otherwise cause insufficient strength and poor transparency in the molded article.
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 nucleating agent effectively improves both thermal stability and transparency of polyolefin resin compositions, preventing yellowing and ensuring sufficient heat resistance and transparency in molded articles.
Implementation Method 1
a method of adding a nucleating agent, a crystallization accelerator and/or the like is employed... sodium 2,2'-methylene-bis(4,6-di-tert-butylphenyl) phosphate not only markedly improves the rigidity, the thermal deformation temperature and the crystallization temperature of polyolefin resins
Data Source
AI summary
Provided are: a nucleating agent capable of simultaneously improving the thermal stability and the transparency of a polyolefin resin; a polyolefin-based resin composition containing the same; and a molded article of the composition. The nucleating agent contains a compound represented by Formula (1) below where R1 to R4 each independently represent a hydrogen atom or a linear or branched alkyl group having 1 to 9 carbon atoms; R5 represents an alkanediyl group having 1 to 4 carbon atoms; and M represents a hydrogen atom or a sodium atom. In this nucleating agent, the mass ratio of phosphorus atoms and sodium atoms, P/Na, is in a range of 1.200 to 1.500.