Surfactant Composition for Aqueous Resin Dispersion Stability

Solution Overview

Problem

Existing surfactant compositions for aqueous resin dispersions fail to simultaneously achieve high polymerization stability, chemical stability, and water resistance in resin films.

Innovation Solution

A surfactant composition comprising a reactive nonionic surfactant (A) and an anionic surfactant (B) with a polymerizable carbon-carbon unsaturated bond, where surfactant (A) is a polyoxyalkylene-1-(allyloxymethyl)alkyl ether and surfactant (B) has a hydrophobic group different from surfactant (A), used in emulsion polymerization to produce an aqueous resin dispersion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an anionic surfactant is used, then polymerization stability is improved, but chemical stability deteriorates

Engineering Contradiction:

Improvepolymerization stabilityVSAvoidchemical stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The invention combines anionic surfactant (B) and nonionic surfactant (A) in a specific mixture ratio (0.1-5 mass%) to achieve both polymerization stability (from anionic component) and chemical stability (from nonionic component), resolving the contradiction between these two stability requirements

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The invention uses a composite surfactant system comprising two different types of surfactants with complementary properties - anionic surfactant for polymerization stability and nonionic surfactant for chemical stability, creating a synergistic effect that neither component could achieve alone

Inventive Principle:

Principle #40Composite materials

2Stability of the object's composition

If a nonionic surfactant is used, then chemical stability is improved, but polymerization stability deteriorates

Engineering Contradiction:

Improvechemical stabilityVSAvoidpolymerization stability

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The invention combines anionic surfactant (B) and nonionic surfactant (A) in a specific mixture ratio (0.1-5 mass%) to achieve both polymerization stability (from anionic component) and chemical stability (from nonionic component), resolving the contradiction between these two stability requirements

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The invention uses a composite surfactant system comprising two different types of surfactants with complementary properties - anionic surfactant for polymerization stability and nonionic surfactant for chemical stability, creating a synergistic effect that neither component could achieve alone

Inventive Principle:

Principle #40Composite materials

3Ease of operation

If a nonreactive surfactant is used, then ease of operation is improved, but water resistance of resin film deteriorates

Engineering Contradiction:

Improvesurfactant handlingVSAvoidwater resistance

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

The invention incorporates a polymerizable unsaturated bond in the anionic surfactant (B) structure, allowing it to react with the polymer matrix during emulsion polymerization and form covalent bonds beforehand, ensuring water resistance is built into the resin film structure from the start

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The polymerizable unsaturated bond in surfactant (B) acts as an intermediary that connects the surfactant molecule to the polymer chain through covalent bonding during polymerization, creating a strong anchor that improves water resistance without complicating surfactant handling

Inventive Principle:

Principle #24Intermediary (Mediator)

4Stability of the object's composition

If a reactive surfactant is used, then water resistance of resin film is improved, but polymerization stability deteriorates

Engineering Contradiction:

Improvewater resistanceVSAvoidpolymerization stability

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The invention carefully controls the concentration of reactive anionic surfactant (B) within a specific range (0.1-5 mass%) to optimize the balance between water resistance (benefit of reactivity) and polymerization stability (maintained by limiting excessive reactivity that could cause premature polymerization or instability

Inventive Principle:

Principle #35Parameter changes

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 achieves high polymerization stability, chemical stability, and enhanced water resistance in resin films, improving the performance of aqueous resin dispersions.

Implementation Method 1

The anionic surfactant (B) has a polymerizable carbon-carbon unsaturated bond

Methodology Applied

Scientific EffectPolymerization: Photopolymerisation

Implementation Method 2

an anionic or nonionic surfactant is used as an emulsifier for monomers and a dispersant for produced resins

Methodology Applied

Scientific EffectSurfactant action: Surfactant

Data Source

PatentEP3508269B1Surfactant composition

Publication Date: 2021.06.23 DKS CO LTD

AI summary

The polymerization stability and the chemical stability and the water resistance of resin films are improved. A surfactant composition according to an embodiment contains a surfactant (A) represented by general formula (1) and an anionic surfactant (B) having a hydrophobic group different from that of the surfactant (A). R1 represents an alkyl group with 8 to 14 carbon atoms, A represents an alkylene group with 2 to 4 carbon atoms, and n representing an average number of moles of an oxyalkylene group added represents 1 to 100.