Polyamide Blend Moulding Material for Brake Booster Lines
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Solution Overview
Problem
Current polyamide blend molding compounds for brake booster lines in vehicles do not meet the required flexibility and temperature resistance standards across varying weather conditions, particularly failing to maintain performance at high and low temperatures, and are not optimized for elastic moduli below 1500 MPa.
Innovation Solution
A polyamide blend molding compound comprising 25-50% partially crystalline polyamides with high melting enthalpy, 10-20% amorphous or microcrystalline polyamides, 5-10% polyamides with low carbon atoms, 10-40% polyamide elastomers, and 0-35% non-polyamide elastomers, which provides improved flexibility and temperature resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polyamide blend molding compounds are used, then manufacturing simplicity is maintained, but flexibility and temperature resistance performance deteriorate across varying weather conditions
Solution Approach 1:
The patent applies composite materials by creating a multi-component polyamide blend system comprising at least three different polyamides with specific properties (melting points, crystallization behaviors, molecular weights) to achieve superior temperature resistance and flexibility. This composite approach allows the material to maintain performance across extreme temperature ranges from -40°C to +150°C while meeting elastic modulus requirements below 1500 MPa.
Solution Approach 2:
The patent employs parameter changes by precisely controlling the melting points, crystallization temperatures, and molecular weights of each polyamide component within specific ranges. By adjusting these parameters, the formulation achieves optimal balance between flexibility, temperature resistance, and elastic modulus, resolving the contradiction between reliability and performance optimization.
2Temperature
If polyamide blend compounds are formulated for high temperature resistance, then performance at +150°C is improved, but flexibility at low temperatures deteriorates
Solution Approach 1:
The patent applies local quality by assigning different functional roles to specific polyamide components based on their thermal properties. Fast-crystallizing polyamides provide low-temperature flexibility and early-stage structural formation, while slow-crystallizing polyamides with higher melting points provide high-temperature stability. This differential functional assignment resolves the contradiction between high-temperature performance and low-temperature flexibility.
Solution Approach 2:
The patent employs dynamics by creating a multi-stage crystallization process where different polyamides crystallize at different rates and temperatures. During cooling, fast-crystallizing components form first providing initial structure and flexibility, while slow-crystallizing components form later providing thermal stability. This dynamic, time-dependent crystallization behavior enables the material to adapt its properties across temperature ranges.
Data Source
Figure 1
AI summary
A first variant of a polyamide blend molding compound with a polyamide blend component and at least one impact-resistant component is characterized in that the polyamide blend component comprises the following polyamides: (A) 20 to 65 wt.% of at least one semi-crystalline polyamide with a melting enthalpy of > 40 J/g and with an average of at least 8 carbon atoms per monomer unit; (B) 8 to 25 wt.% of at least one amorphous and/or microcrystalline polyamide, wherein the microcrystalline polyamide has a melting enthalpy in the range of 4 to 40 J/g; and (C) 1 to 20 wt.% of at least one polyamide with an average of at most 6 carbon atoms per monomer unit. The impact-resistant component of this polyamide blend molding compound comprises: (D) 10 to 40 wt.% of a polyamide elastomer composed of hard segments and soft segments, the hard segments being based on lactams and/or aminocarboxylic acids; and (E) 0 to 35 wt.% of a non-polyamide elastomer. All values are in wt.The percentages refer to the total weight of the polyamide blend molding compound and, optionally supplemented by commercially available additives, result in 100% by weight. Molded parts produced from this polyamide blend molding compound, such as brake booster lines, exhibit a maximum modulus of elasticity of 2400 MPa at a temperature of -40 °C. The same molded parts exhibit a minimum modulus of elasticity of 180 MPa at a temperature of +120 °C.