Polyamide Composition with Titanium Oxide for Heat Resistance
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Solution Overview
Problem
Conventional polyamides, such as PA6 and PA66, lack sufficient heat resistance, reflow resistance, light discoloration resistance, and extrusion processability, which are essential for applications in the automotive and electronics industries, particularly in high-temperature environments.
Innovation Solution
A polyamide composition comprising a polyamide with a dicarboxylic acid unit and a diamine unit, combined with 20-70 mass% titanium oxide and 0.5-7.5 mass% metal hypophosphite, offering improved heat discoloration resistance, light discoloration resistance, and extrusion processability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional polyamides (PA6, PA66) are used to achieve good fabricability and mechanical properties, then ease of manufacture and strength are improved, but heat resistance is insufficient due to low melting point
Solution Approach 1:
The patent uses a composite material system consisting of PA6T/2MPDT polyamide resin combined with specific inorganic fillers (titanium oxide, magnesium hydroxide, aluminum hydroxide) and flame retardants. This composite approach allows the material to achieve both the desired heat resistance (melting point ≥370°C) and manufacturability by combining the high-temperature stability of PA6T with the processing advantages of the polyamide system and the functional benefits of the inorganic additives.
Solution Approach 2:
The patent changes the chemical composition parameters of the polyamide by using a copolymer of hexamethylenediamine and 2-methylpentamethylenediamine with terephthalic acid, creating PA6T/2MPDT resin. This parameter change in the molecular structure increases the melting point to 370°C or higher while maintaining the polyamide's inherent fabricability and mechanical properties.
2Temperature
If high-melting-point polyamide (PA6T) is used to improve heat resistance, then temperature resistance is improved, but pyrolysis occurs during forming process making it difficult to obtain molded products with sufficient properties
Solution Approach 1:
The patent introduces inorganic fillers (titanium oxide, magnesium hydroxide, aluminum hydroxide) and flame retardants as intermediary substances that mediate between the high-temperature stability requirement and the forming processability. These additives act as heat stabilizers and processing aids that prevent pyrolysis during molding, allowing the PA6T/2MPDT resin to be successfully formed into molded products with both high heat resistance and sufficient mechanical properties.
Solution Approach 2:
The composite material system combines PA6T/2MPDT polyamide resin with inorganic fillers and flame retardants in specific proportions. This composite formulation resolves the contradiction by providing thermal stability during processing while maintaining the high melting point for heat resistance, enabling successful molding without pyrolysis.
3Ease of manufacture
If semi-aromatic polyamide (6T copolymer) is used to lower melting point to 220-340°C to prevent pyrolysis, then forming processability is improved, but reflow resistance and light discoloration resistance are insufficient
Solution Approach 1:
The patent changes the melting point parameter to 370°C or higher by using PA6T/2MPDT copolymer resin, which is higher than conventional semi-aromatic polyamides. This parameter change maintains formability through the copolymer structure while significantly improving reflow resistance and light discoloration resistance, which are insufficient in lower-melting-point polyamides.
Solution Approach 2:
The patent uses a combination of inorganic fillers and flame retardants as sacrificial or stabilizing components that protect the polyamide matrix during high-temperature processing and service. These additives compensate for the higher processing temperature required by the high-melting-point resin, ensuring reflow resistance and preventing degradation.
4Strength
If conventional polyamides are used to achieve good mechanical properties, then strength is improved, but light discoloration resistance and extrusion processability are insufficient
Solution Approach 1:
The patent uses a composite material system that combines PA6T/2MPDT polyamide resin with inorganic fillers (titanium oxide for whiteness and UV resistance, magnesium hydroxide and aluminum hydroxide for flame retardancy) and flame retardants. This composite formulation maintains the strong mechanical properties of the polyamide matrix while improving extrusion processability through the lubricating effect of the inorganic fillers and enhancing light discoloration resistance through titanium oxide's UV absorption properties.
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 polyamide composition exhibits excellent whiteness, reflow resistance, heat discoloration resistance, and light discoloration resistance, along with enhanced extrusion processability, making it suitable for high-temperature applications in the automotive and electronics industries.
Implementation Method 1
20 to 70 mass% of titanium oxide
Implementation Method 2
exhibits excellent whiteness, reflow resistance, heat discoloration resistance, and light discoloration resistance
Implementation Method 3
0.5 to 7.5 mass% of a phosphorus-based compound (C), wherein the phosphorus-based compound (C) is a metal hypophosphite
Implementation Method 4
exhibits excellent whiteness, reflow resistance, heat discoloration resistance
Implementation Method 5
enhanced extrusion processability
Implementation Method 6
enhanced extrusion processability
Data Source
AI summary
It is an object of the present invention to provide a polyamide composition having excellent whiteness, reflow resistance, heat discoloration resistance, light discoloration resistance, and extrusion processability. A polyamide composition has: a polyamide (A) having a dicarboxylic acid unit (a) and a diamine unit (b); 20 to 70 mass% of titanium oxide (B); and 0.5 to 7.5 mass% of a phosphorus-based compound (C).