Polyamide 6 in Glass Fiber Reinforced PBT for Viscosity Reduction
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Solution Overview
Problem
Current technologies face challenges in reducing the melt viscosity and filling pressure of glass fiber-reinforced poly-C1-C6-alkylene terephthalate compositions for injection molding without compromising heat resistance and mechanical properties like tensile modulus, tensile strength, and elongation at break.
Innovation Solution
The use of polyamide 6 is introduced to reduce the melt viscosity and filling pressure in glass fiber-reinforced poly-C1-C6-alkylene terephthalate compositions, specifically polybutylene terephthalate-based materials, by adding 0.5 to 15 parts by weight of polyamide 6, which enhances processing conditions without adversely affecting mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If copolymer of α-olefin with methacrylic acid ester or acrylic acid ester is added to reduce melt viscosity, then filling pressure is reduced, but mechanical properties (tensile modulus, tensile strength, elongation at break) deteriorate
Solution Approach 1:
The patent changes the chemical parameter by substituting the copolymer type with polyamide 6, which has different molecular structure and interaction properties with glass fibers, achieving viscosity reduction without mechanical property loss
Solution Approach 2:
The patent creates a composite system by combining polyamide 6 with glass fiber-reinforced poly-C1-C6-alkylene terephthalate, where the polyamide 6 acts as a matrix modifier that improves flow while maintaining reinforcement effectiveness
2Productivity
If polyamide 6 is added to reduce melt viscosity, then processing efficiency is improved, but heat resistance may deteriorate
Solution Approach 1:
The patent optimizes the concentration parameter of polyamide 6 (0.5 to 15 parts by weight per 100 parts of poly-C1-C6-alkylene terephthalate) to achieve the right balance between viscosity reduction and heat resistance maintenance
Solution Approach 2:
The patent applies polyamide 6 specifically in the matrix phase surrounding the glass fibers, where it locally modifies flow properties without significantly affecting the overall thermal performance of the glass fiber-reinforced structure
Data Source
AI summary
The invention relates to the use of polyamide 6 for reducing the melt viscosity to be determined at 260°C according to ISO 11443 and/or the filling pressure to be determined according to EN ISO 294-1 of compositions and molding compounds, wherein 10 to 115 mass parts of glass fibers are present per 100 mass parts of poly-C1-C6-alkylene terephthalate.