P-aramid Pulp and Chopped Fiber Mixture for Friction Materials
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Solution Overview
Problem
There is a persistent need to enhance the green strength of p-aramid pulp while maintaining or exceeding the kaolin filler retention of chopped fibers in products containing p-aramid pulp.
Innovation Solution
A process involving mixing p-aramid pulp with chopped fibers in specific weight percentages, followed by dewatering and drying, results in a mixture with significantly higher green strength and kaolin filler retention compared to p-aramid pulp alone, with the option to further process the dried intermediate to achieve a more open morphology of p-aramid pulp and chopped fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If p-aramid pulp is used to manufacture friction materials and gasket materials, then the filler retention is high (60-85%), but the green strength is insufficient
Solution Approach 1:
The patent combines p-aramid pulp with chopped p-aramid fibers in a hybrid composition. The pulp provides the binding matrix with high filler retention capability, while the chopped fibers provide reinforcement to enhance green strength. This merging of two forms of p-aramid material creates a synergistic effect where both components work together to simultaneously improve strength and maintain filler retention.
Solution Approach 2:
The invention creates a composite material system consisting of p-aramid pulp and chopped p-aramid fibers. The pulp forms the continuous phase that binds filler particles, while the chopped fibers are distributed throughout to provide structural reinforcement. This composite approach allows the material to exhibit both the filler retention properties of the pulp and the strength enhancement from the fibrous reinforcement.
2Strength
If chopped fibers are used instead of p-aramid pulp, then green strength may improve, but kaolin filler retention decreases
Solution Approach 1:
The patent merges the advantages of both p-aramid pulp and chopped fibers by creating a hybrid composition. The pulp component ensures high kaolin filler retention through its fibrillar structure that binds filler particles effectively, while the chopped fiber component contributes to enhanced green strength through fiber reinforcement mechanisms.
Solution Approach 2:
The invention applies different material forms in different functional roles within the same product. The p-aramid pulp serves the local function of filler binding and retention, while the chopped p-aramid fibers serve the local function of structural reinforcement and strength enhancement. This spatial and functional differentiation allows each component to optimize its specific role.
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 resulting mixture exhibits a substantial increase in green strength, up to 100% higher than p-aramid pulp, and maintains or slightly lowers kaolin filler retention, improving the homogeneity and quality of friction materials, gasket materials, and friction papers.
Implementation Method 1
guiding the mixed mass on a dewatering device, whereupon the mixed mass is dewatered to yield a dewatered cake
Implementation Method 2
guiding the dewatered cake i) either directly ii) or via a passage through a cake breaker into a drying atmosphere to yield a dried intermediate
Data Source
AI summary
A process is provided to manufacture a mixture of p-aramid pulp with chopped fibers, wherein said process comprises the following steps: a) Providing a first mass, wherein the first mass comprises p-aramid pulp, b) providing a second mass, wherein the second mass comprises chopped fibers, c) guiding the first mass and the second mass into a mixing device, wherein said first mass and said second mass are mixed to yield a mixed mass, d) guiding the mixed mass on a dewatering device, whereupon the mixed mass is dewatered to yield a dewatered cake, e) guiding the dewatered cake i) either directly ii) or via a passage through a cake breaker into a drying atmosphere to yield a dried intermediate, and f) guiding the dried intermediate i) either directly ii) or via a passage through a homogenizing device into an opening device, wherein the dried intermediate is opened to arrive at an opened mixture of p-aramid pulp and chopped fibers. Furthermore, the mixture and its use are described.