Hydraulic Binder Friction Material for Brake Pads
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Solution Overview
Problem
Friction materials for brake pads containing thermosetting phenolic resins pose environmental sustainability concerns due to the release of phenols and formaldehyde, necessitating the development of alternative compositions that maintain performance while reducing environmental impact.
Innovation Solution
A friction material using a binding composition based on hydraulic binders such as Portland cement, pozzolana cement, or slag cement with specific Blaine fineness, which replaces thermosetting resins, ensuring equivalent performance without phenol release and using lower processing temperatures for hardening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermosetting phenolic resins are used as binding material in friction materials, then braking capability and wear resistance are improved, but phenol and formaldehyde emissions occur causing environmental sustainability problems
Solution Approach 1:
The patent changes the chemical composition parameters by replacing phenolic resins with alternative binding materials such as inorganic binders (alumina, silica, magnesia), organic binders (polymer powders like polyacrylonitrile, polyacrylic acid), or their combinations. This substitution maintains the binding function while eliminating the harmful phenol and formaldehyde emissions, thus resolving the contradiction between braking performance and environmental sustainability.
Solution Approach 2:
The patent employs binders that can be effectively replaced or degraded without leaving harmful residues. The use of inorganic binders and certain organic polymer powders allows for binding performance similar to phenolic resins but with reduced environmental persistence and toxicity, enabling a transition from long-lasting harmful materials to shorter-lived or benign alternatives.
2Reliability
If thermosetting phenolic resins are used as binding material, then excellent final performances are achieved, but the composition releases harmful substances during processing and use
Solution Approach 1:
The patent modifies the chemical composition by substituting phenolic resins with inorganic binders (alumina, silica, magnesia) or organic polymer powders that do not release formaldehyde. These alternative materials maintain the necessary binding strength and wear resistance while eliminating the formaldehyde emission problem, thus resolving the contradiction between performance and environmental safety.
Solution Approach 2:
The patent converts the harmful thermal degradation behavior of phenolic resins (which release formaldehyde) into a beneficial property by selecting binders that either do not degrade thermally or degrade into harmless substances. Inorganic binders and certain organic polymers provide thermal stability or controlled degradation without releasing harmful formaldehyde, thus transforming the harmful thermal behavior into a beneficial characteristic.
3Reliability
If phenolic resins are used in friction materials, then good braking performance is achieved, but environmental sustainability is compromised due to toxic substance release
Solution Approach 1:
The patent changes the chemical composition parameters by replacing phenolic resins with inorganic binders (alumina, silica, magnesia), organic polymer powders, or their combinations. These alternatives maintain the friction and braking performance while eliminating the release of toxic phenols and formaldehyde, thus resolving the contradiction between braking performance and environmental sustainability.
Solution Approach 2:
The patent employs composite binding systems combining inorganic binders (alumina, silica, magnesia) with organic polymer powders (polyacrylonitrile, polyacrylic acid, carboxymethyl cellulose). This composite approach achieves the desired braking performance and wear resistance while eliminating toxic emissions, as the inorganic and organic components work synergistically to provide binding strength without the harmful byproducts of phenolic resins.
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 hydraulic binder-based friction material achieves performance comparable to thermosetting resin-based materials in terms of braking capability, wear resistance, and thermal stability, while eliminating phenol emissions and improving environmental sustainability.
Implementation Method 1
a binding composition based on a hydraulic binder selected among Portland cement, pozzolana cement or slag cement
Data Source
AI summary
A friction material is disclosed comprising a binding composition based on a hydraulic binder and its use in brake pads and industrial applications.