Nucleator Blend Identification for Polyolefin Clarity
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Solution Overview
Problem
Current methods for preparing nucleated polyolefin materials require high processing temperatures due to the high melting points of nucleators, leading to increased energy consumption, longer cycle times, and potential nucleator sublimation, which complicates the production of plastics with desired optical clarity and mechanical properties.
Innovation Solution
Identifying a blend of nucleators with a specific weight ratio that exhibits lower minimum dissolution temperatures in polyolefin resins, allowing for effective nucleation and clarification at lower processing temperatures without compromising haze values or organoleptic properties, through a method involving the preparation and testing of various blends to determine optimal weight ratios for improved solubility and dissolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high melting point nucleators are used to achieve desired optical clarity and mechanical properties, then nucleation efficiency and material properties are improved, but processing temperature must be increased leading to higher energy consumption and longer cycle times
Solution Approach 1:
The patent changes the physical-chemical parameters of the nucleating system by using blends of nucleators with different melting points and solubility characteristics. This allows the system to achieve effective nucleation at lower processing temperatures while maintaining the desired optical clarity and mechanical properties, thereby reducing energy consumption without sacrificing material performance
Solution Approach 2:
The patent employs composite nucleating systems consisting of multiple nucleators blended together. These composite systems combine the advantages of individual nucleators with different thermal properties, enabling effective nucleation at reduced temperatures while maintaining nucleation efficiency and material properties, thus resolving the contradiction between high temperature requirements and energy consumption
2Reliability
If high processing temperatures are used to dissolve high melting point nucleators, then adequate dissolution and nucleation are achieved, but cycle time increases due to longer cooling periods
Solution Approach 1:
The patent modifies the thermal parameters of the nucleating system by selecting nucleators and blends with lower melting points and improved solubility. This enables adequate dissolution and effective nucleation to occur at lower processing temperatures, which reduces the cooling time required and thereby shortens the overall cycle time while maintaining nucleation effectiveness
Solution Approach 2:
The patent applies local quality optimization by selecting specific nucleators with tailored solubility and melting point characteristics suited for the particular polyolefin resin being processed. This localized optimization of nucleator properties allows for effective nucleation at lower temperatures specific to each resin type, reducing cycle time without compromising nucleation effectiveness
3Reliability
If high processing temperatures are used to accommodate high melting point nucleators, then dissolution is improved, but nucleator sublimation occurs leading to plate-out on moulding equipment
Solution Approach 1:
The patent changes the thermal stability parameters of the nucleating system by selecting nucleators with lower melting points and higher thermal stability. This allows complete dissolution to be achieved at lower processing temperatures that are below the sublimation point of the nucleators, thereby preventing nucleator sublimation and plate-out on moulding equipment while maintaining dissolution completeness
Solution Approach 2:
The patent converts the potential harm of high temperature processing into a benefit by selecting nucleators whose melting points are optimized for the processing temperature range. This ensures that the nucleators dissolve completely at the processing temperature without reaching their sublimation point, transforming the temperature constraint into an advantage that prevents plate-out while achieving adequate dissolution
4Use of energy by moving object
If processing temperature is reduced to lower energy consumption, then energy efficiency is improved, but dissolution of high melting point nucleators becomes insufficient leading to increased haze
Solution Approach 1:
The patent changes the solubility parameters of the nucleating system by selecting nucleators and blends with improved solubility characteristics and lower melting points. This enables complete dissolution of the nucleators at reduced processing temperatures, maintaining optical clarity and preventing haze formation while achieving lower energy consumption through reduced processing temperatures
Solution Approach 2:
The patent uses composite nucleating systems where multiple nucleators with different solubility and melting point characteristics are blended together. This composite approach ensures that at least one nucleator in the blend remains effectively dissolved at lower processing temperatures, maintaining optical clarity and preventing haze while enabling energy-efficient processing
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 method enables the production of nucleated polyolefin materials with reduced haze and improved optical properties at lower processing temperatures, broadening the temperature range for material preparation while maintaining desirable mechanical and optical properties.
Implementation Method 1
preparation of a nucleated polyolefin material typically requires that the nucleator be dissolved in the molten resin
Implementation Method 2
Subsequent recrystallization of the soluble nucleator forms a fine crystalline network providing nucleation sites
Implementation Method 3
which reduce the size of spherulites formed in the resin as it cools, thereby reducing light scattering and improving clarity
Implementation Method 4
nucleators can sublimate when heated to temperatures near their melting points, for instance during the high temperature moulding operation, leading to unwanted re-deposition on moulding equipment
Data Source
AI summary
The present invention relates to a method for identifying a blend of nucleators with reduced haze in nucleated polyolefin material compared to blends of the same nucleators having different component weight ratios. The method comprises:i) preparing multiple blends of at least two nucleators wherein each blend containing the same nucleators in different weight ratios, wherein the blends include one or more blends in which one of the nucleators is a major weight fraction and one or more blends where the same nucleator is a minor weight fraction;ii) determining, for each blend, a minimum dissolution temperature when the blend completely dissolves in individual samples of the same molten polyolefin resin, wherein the concentration of each blend is substantially the same and below the saturation point in the molten polyolefin resin; andiii) identifying a blend that has a lower minimum dissolution temperature than the majority of the blends.