Polyamide Brake Booster Pipe Climate Resistance
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Solution Overview
Problem
Current brake booster lines for vehicles, particularly those used in vacuum systems, face challenges in meeting the requirements of temperature resistance, ozone resistance, and durability across varying weather and temperature conditions, as well as maintaining performance over multiple climate cycles without cracking.
Innovation Solution
A vacuum brake booster line made from a polyamide blend molding compound with a specific composition, including partially crystalline and amorphous polyamides, and an impact-toughening component, which provides enhanced mechanical properties and resistance to heat, ozone, and repeated climate changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyamide pipes are used for brake booster lines, then they meet basic temperature and strength requirements, but they show insufficient impact strength and crack resistance under repeated climate changes
Solution Approach 1:
The patent uses a composite material consisting of polyamide 6 (PA6) as the base polymer and polyethylene (PE) as the impact modifier. This composite structure combines the high strength and temperature resistance of PA6 with the excellent impact resistance and flexibility of PE, creating a material that maintains structural integrity while resisting cracking under repeated climate changes.
2Temperature
If polyamide pipes are used for brake booster lines, then they provide sufficient strength at high temperatures, but they become too rigid and brittle at low temperatures
Solution Approach 1:
The patent modifies the material parameters by incorporating polyethylene (PE) with a lower glass transition temperature into the polyamide 6 matrix. This changes the thermal-mechanical properties of the composite, allowing it to remain flexible and ductile at low temperatures while maintaining strength characteristics at operating temperatures.
3Reliability
If polyamide pipes are used for brake booster lines, then they meet basic durability requirements, but they show insufficient resistance to heat aging and ozone
Solution Approach 1:
The patent employs inexpensive antioxidants and UV stabilizers as additives in the polyamide 6/polyethylene composite formulation. These additives act as sacrificial components that preferentially react with harmful oxygen and UV radiation, protecting the main polymer structure from degradation during heat aging and ozone exposure.
Data Source
Figure 1~3
AI summary
A brake booster line is manufactured from a polyamide blend molding compound containing a polyamide blend component and an impact-resistant component. The polyamide blend component of the polyamide blend molding compound comprises the following polyamides: (A) 25 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) 0 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 55 wt.% of at least one polyamide with an average of no more than 6 carbon atoms per monomer unit. The impact-resistant component consists of: (D) 5 to 35 wt.% of a non-polyamide elastomer or a mixture of non-polyamide elastomers. All values are in wt.-% refers to the total weight of the polyamide blend molding compound and results, optionally supplemented by commercially available additives also added, to 100 wt.%.