Mixed Surfactant Composition for Pressure-Sensitive Polymer Emulsions
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Solution Overview
Problem
Existing reactive emulsifiers fail to provide polymer emulsions with sufficient pressure-sensitive adhesive characteristics, mechanical stability, and water resistance.
Innovation Solution
A surfactant composition comprising specific amounts of an anionic surfactant and a nonionic surfactant, represented by general formulas (1) and (2), respectively, is used for emulsion polymerization to enhance the properties of the polymer emulsion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional reactive emulsifiers (with (meth)allyl ether groups or (meth)acrylic acid ester groups) are used, then the polymer emulsion can be produced, but the pressure-sensitive adhesive characteristics, mechanical stability, and water resistance are insufficient
Solution Approach 1:
The invention changes the chemical structure parameters of the emulsifier by introducing a specific sulfonate group structure with formula (1) where R1 is a C1-C20 alkyl group and m is 1-50, and combines it with a nonionic emulsifier of formula (2) where R2 is a C1-C20 alkyl group and n is 1-50. This structural parameter change provides excellent pressure-sensitive adhesive characteristics, mechanical stability, and water resistance that conventional emulsifiers cannot achieve
Solution Approach 2:
The invention uses a composite emulsifier system combining an anionic emulsifier (sulfonate type, formula 1) and a nonionic emulsifier (formula 2) in specific proportions (anionic: 95.5-99.2 mass%, nonionic: 0.8-4.5 mass%). This composite approach synergistically improves pressure-sensitive adhesive characteristics, mechanical stability, and water resistance beyond what single emulsifiers can provide
2Stability of the object's composition
If conventional reactive emulsifiers are used, then the emulsion polymerization can proceed, but the mechanical stability of the polymer emulsion is insufficient
Solution Approach 1:
The invention changes the emulsifier structure by using a sulfonate group-based anionic emulsifier (formula 1) combined with a nonionic emulsifier (formula 2). This structural modification enhances the mechanical stability of the polymer emulsion while maintaining ease of manufacture through standard emulsion polymerization processes
Solution Approach 2:
The composite emulsifier system comprising an anionic sulfonate emulsifier and a nonionic emulsifier in specific ratios provides superior mechanical stability. The synergistic interaction between the two emulsifier types stabilizes the polymer emulsion structure without complicating the manufacturing process
3Object-affected harmful factors
If conventional reactive emulsifiers are used, then the polymer emulsion can be produced, but the water resistance is insufficient
Solution Approach 1:
The invention modifies the emulsifier chemical parameters by introducing a sulfonate group structure (formula 1) with specific alkyl chain lengths (R1: C1-C20, m: 1-50) and combining it with a nonionic emulsifier (formula 2). This parameter optimization provides excellent water resistance while maintaining ease of manufacture through conventional emulsion polymerization
Solution Approach 2:
The composite emulsifier system of anionic sulfonate type and nonionic type in controlled proportions creates a synergistic effect that significantly improves water resistance. The specific combination ratios (anionic: 95.5-99.2 mass%, nonionic: 0.8-4.5 mass%) optimize the hydrophobic-hydrophilic balance for enhanced water resistance without affecting manufacturing simplicity
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 surfactant composition results in a polymer emulsion with improved pressure-sensitive adhesive characteristics, mechanical stability, and water resistance.
Implementation Method 1
a surfactant composition comprising 95.5 mass% to 99.2 mass% of an anionic surfactant represented by the following general formula (1) with respect to a total amount of the surfactant composition; and 0.8 mass% to 4.5 mass% of a nonionic surfactant represented by the following general formula (2)
Data Source
AI summary
This disclosure relates to: a surfactant composition that may be used in emulsion polymerization, the surfactant composition including: 95.5 mass% to 99.2 mass% of an anionic surfactant represented by the following general formula (1) with respect to a total amount of the surfactant composition; and 0.8 mass% to 4.5 mass% of a nonionic surfactant represented by the following general formula (2) with respect to the total amount of the surfactant composition; a composition for emulsion polymerization including the surfactant composition; a method of producing a polymer emulsion using the surfactant composition; and a polymer emulsion obtained by the production method using the surfactant composition: where R1 represents a linear or branched alkyl group having 8 to 15 carbon atoms, "m" represents a number of from 5 to 50, and M represents a hydrogen atom, an alkali metal atom, or an ammonium group; and where R2 represents a linear or branched alkyl group having 8 to 15 carbon atoms, and "n" represents a number of from 5 to 50.