Aqueous Polymer Dispersion Binder for Filter Materials
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Solution Overview
Problem
Existing binders for filter materials and decorative sheets often compromise mechanical stability and chemical resistance while affecting permeability, particularly when used with cellulose fibers, leading to reduced bursting strength and service stability under humid conditions and elevated temperatures.
Innovation Solution
An aqueous polymer dispersion is developed through free-radical emulsion polymerization, comprising methacrylic acid, methyl methacrylate, N-methylolacrylamide, and principal monomers like n-butyl acrylate and styrene, which serves as a binder for filter materials and decorative sheets, enhancing mechanical stability and chemical resistance without impacting permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If binders with very high proportion of acid groups are used for filter materials, then binding strength is improved, but service stability and bursting strength are reduced after storage under humid conditions and elevated temperature
Solution Approach 1:
The patent changes the chemical parameters of the binder by using a copolymer with specifically controlled acid group content (0.1-5% by weight of methacrylic acid) and incorporating N-methylolacrylamide (1-10% by weight) which provides crosslinking capability without excessive acidity. This parameter optimization resolves the contradiction by achieving sufficient binding strength while maintaining service stability under humid and elevated temperature conditions.
Solution Approach 2:
The patent creates a composite binder system by combining multiple monomers (methacrylic acid, methyl methacrylate, N-methylolacrylamide, and principal monomers M) to form a copolymer with balanced properties. This composite approach allows the binder to achieve both strong adhesion to cellulose fibers and resistance to degradation under storage conditions, resolving the contradiction between binding strength and service stability.
2Strength
If binders are applied to filter materials to improve mechanical stability, then tensile strength and bursting strength are improved, but permeability may be affected
Solution Approach 1:
The binder is applied in a controlled manner to provide localized reinforcement at fiber junctions and critical stress points without uniformly coating the entire filter material surface. This localized application maintains the open pore structure and permeability of the bulk material while providing sufficient mechanical strength where needed.
Solution Approach 2:
The binder formulation and application process are designed to maintain the porous structure of the filter material. The copolymer binder forms a network that reinforces the material without blocking pores, ensuring that permeability is preserved while mechanical stability is enhanced.
3Stability of the object's composition
If conventional binders are used for decorative sheets, then consolidation is achieved, but chemical resistance and mechanical stability under humid conditions are compromised
Solution Approach 1:
The patent uses N-methylolacrylamide as a crosslinking agent that provides rapid consolidation and adequate chemical resistance for the intended application lifecycle of decorative sheets. The binder is optimized to provide sufficient performance during the service life of the decorative sheet without requiring excessive durability, balancing cost and performance.
Solution Approach 2:
The binder's chemical composition is optimized with controlled acid group content and specific crosslinking agents to provide adequate chemical resistance for decorative sheet applications. The formulation parameters are tuned to achieve the required consolidation and chemical resistance without over-engineering the system.
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 polymer dispersion significantly improves mechanical stability, bursting strength, and chemical resistance of filter materials and decorative sheets, maintaining high tensile strength and dimensional stability even after storage under humid conditions and elevated temperatures without altering the permeability of the filter materials.
Implementation Method 1
an aqueous polymer dispersion obtainable by free-radical emulsion polymerization comprising a) 0.1-5% by weight of methacrylic acid b) 1-10% by weight of methyl methacrylate c) 0.1-4% by weight of N-methylolacrylamide
Data Source
AI summary
The present invention relates to the use of an aqueous polymer dispersion comprising methacrylic acid and N-methylolacrylamide as a binder for producing filter materials and for base paper for decorative sheets.