PVA Resin 1,2-Diol Side Chains Emulsion Stability
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Solution Overview
Problem
Existing aqueous emulsions, despite improvements in mechanical and freezing stability, lack sufficient stability during long-term standing at high temperatures, necessitating a solution that enhances thermal stability while maintaining mechanical stability and water resistance.
Innovation Solution
A process for producing an aqueous emulsion using a PVA-based resin with a 1,2-diol component in its side chain, combined with emulsion-polymerizing unsaturated monomers, which results in improved stability and allows for conversion into a redispersible powder with excellent mechanical stability and water resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional PVA-based resins are used as dispersion stabilizers, then mechanical stability and freezing stability are improved, but stability to long-term standing at high temperatures is insufficient
Solution Approach 1:
The invention changes the chemical structure parameters of the PVA-based resin by introducing 1,2-diol components in side chains and controlling the degree of polymerization to 50-500. This structural modification enables the resin to maintain both emulsion polymerization stability and high-temperature standing stability simultaneously, resolving the contradiction between conventional stability improvements and thermal stability deficiencies.
Solution Approach 2:
The invention creates a composite stabilizer system by combining PVA-based resin with specific structural features (1,2-diol side chains) with unsaturated monomers during emulsion polymerization. This composite approach produces a polymer where the PVA-based resin provides mechanical and freezing stability while the integrated unsaturated monomer structure provides high-temperature stability, achieving all required stability properties.
2Reliability
If the aqueous emulsion is converted into powder by removing water, then storage stability is improved, but mechanical stability upon redispersion is often compromised
Solution Approach 1:
The invention performs preliminary structural design of the PVA-based resin with 1,2-diol side chains and controlled polymerization degree before emulsion formation. This preliminary structural optimization ensures that when the emulsion is later converted to powder and redispersed, the resin maintains its stabilizing function and mechanical stability, preventing composition degradation during the water removal and redispersion process.
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 resulting emulsion exhibits enhanced mechanical, freezing, and high-temperature stability, and the redispersible powder maintains excellent mechanical stability upon rehydration, suitable for applications in cement/mortar admixtures, coatings, and adhesives.
Implementation Method 1
a PVA-based resin (A) comprising a 1,2-diol component in a side chain
Implementation Method 2
emulsion-polymerizing at least one unsaturated monomer selected from an ethylenically unsaturated monomer and a diene-based monomer in the presence of the PVA-based resin (A) as an emulsifier
Implementation Method 3
can be converted into a powder by removing water
Data Source
AI summary
A water based emulsion that excels in emulsion polymerization stability at the stage of production and also excels in mechanical stability, freezing stability, long-term neglect stability at high temperature, water-resistant adhesion and re-dispersibility; and a re-dispersible resin and adhesive making use of the water based emulsion. There is provided a water based emulsion comprising polyvinyl alcohol resin (A) of 50 to 2500 average polymerization degree having a 1,2-diol component in side chains thereof and polymer (B) from at least one unsaturated monomer selected from among ethylenically unsaturated monomers and diene monomers.