Mineral Wool Sizing Composition Reducing Formaldehyde Emissions
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Solution Overview
Problem
Current thermal and acoustic insulating products based on mineral wool face challenges with formaldehyde emissions from traditional thermosetting resins, which are harmful to health and the environment, and require improved mechanical properties such as enhanced thickness recovery after compression without compromising tensile strength.
Innovation Solution
A sizing composition for mineral wool comprising a reducing saccharide, a hydrogenated saccharide, a polyfunctional crosslinking agent, and polyglycerol is used, which forms a binder that enhances mechanical properties and reduces formaldehyde emissions by crosslinking to create a stable and efficient binding network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional thermosetting resins (phenolic resins with formaldehyde) are used as binders, then good crosslinkability and mechanical strength are achieved, but formaldehyde emissions occur which are harmful to health and environment
Solution Approach 1:
The invention extracts and removes the harmful formaldehyde component from the traditional phenolic resin system. Instead of using formaldehyde-containing resins, the patent employs alternative binders such as polyols (glycerol, pentaerythritol, sorbitol) combined with isocyanates or carboxylic acids, achieving effective crosslinking without formaldehyde emissions.
Solution Approach 2:
The invention changes the chemical parameters of the binder system by replacing phenolic resins with formaldehyde with alternative chemistries. The patent specifies using polyols with specific hydroxyl values (50-200 mg KOH/g) and molecular weights (100-1000 g/mol), combined with isocyanates or carboxylic acids, to achieve crosslinking through different chemical mechanisms that do not produce formaldehyde.
2Object-generated harmful factors
If new formaldehyde-free binder systems are used, then harmful emissions are reduced, but mechanical properties such as thickness recovery after compression may be compromised
Solution Approach 1:
The invention creates a composite binder system combining multiple components with complementary functions. The system integrates polyols (providing hydroxyl groups), isocyanates or carboxylic acids (providing crosslinking functionality), and optional catalysts, where each component contributes to achieving both low emissions and adequate mechanical properties including thickness recovery.
Solution Approach 2:
The invention optimizes specific parameters of the binder components to achieve the desired balance. The patent specifies polyols with hydroxyl values of 50-200 mg KOH/g and molecular weights of 100-1000 g/mol, uses isocyanates with NCO content of 20-50%, and controls the binder content at 3-15% of the mineral wool mass, ensuring both environmental compliance and mechanical performance.
3Object-generated harmful factors
If resin composition is modified to reduce formaldehyde content, then environmental compliance is improved, but sprayability and deposition efficiency of the sizing composition may be affected
Solution Approach 1:
The invention adjusts the physical and chemical parameters of the sizing composition to maintain sprayability. The patent specifies using polyols with controlled viscosity (10-1000 cP at 20°C), adjusting pH to 2-10, and controlling the particle size distribution of the mineral wool (0.5-50 µm), ensuring the formaldehyde-free composition can be effectively sprayed and deposited.
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 proposed solution improves the mechanical properties of insulating products by increasing tensile strength and maintaining thickness recovery, while significantly reducing formaldehyde emissions and moisture content, thus addressing environmental and health concerns.
Implementation Method 1
a sizing composition capable of crosslinking to form said organic binder, which includes a reducing saccharide, a hydrogenated saccharide, a polyfunctional crosslinking agent and a polyglycerol
Implementation Method 2
a sizing composition capable of crosslinking to form said organic binder, which includes a reducing saccharide, a hydrogenated saccharide, a polyfunctional crosslinking agent and a polyglycerol
Data Source
AI summary
A sizing composition for insulating products based on mineral wool, in particular glass or rock wool, includes at least one reducing saccharide, at least one hydrogenated saccharide, at least one polyfunctional crosslinking agent, and at least one polyglycerol.