Aqueous Emulsion Composition with Crosslinked PVA for Heat and Water Resistance
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Solution Overview
Problem
Conventional aqueous emulsion compositions based on vinyl acetate polymer resins exhibit low heat resistance, insufficient hot water resistance, and boiling water resistance, while also lacking viscosity stability and stain resistance, particularly in adhesive applications.
Innovation Solution
An aqueous emulsion composition is developed that includes a polymer with a structural unit derived from specific monomers, such as acrolein derivatives, and a cyclic acid anhydride, which enhances heat resistance, water resistance, hot water resistance, boiling water resistance, and viscosity stability, and prevents staining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a PVA is used as a protective colloid in combination with a carboxy group-containing unsaturated monomer, then bonding property and water resistance are improved, but heat resistance and boiling water resistance remain insufficient
Solution Approach 1:
The invention changes the chemical structure parameters of the protective colloid by introducing specific structural units (formulas I-IV) into PVA, which contain oxygen-containing functional groups that can form crosslinked structures. This structural parameter change enables the coating to achieve both water resistance and heat resistance simultaneously.
Solution Approach 2:
The invention creates a composite protective colloid system by combining PVA with specific structural units (formulas I-IV) that have different functional properties. The PVA provides base protection while the introduced structural units provide heat resistance through crosslinking, creating a composite material with superior overall performance.
2Temperature
If ethylene-modified PVA is used as a protective colloid, then heat resistance and hot water resistance are improved to some degree, but boiling water resistance and final bond strength remain insufficient
Solution Approach 1:
The invention further modifies the protective colloid structure by introducing specific structural units (formulas I-IV) with oxygen-containing functional groups that can form crosslinked structures. This changes the chemical bonding parameters of the PVA, enabling it to achieve sufficient boiling water resistance and final bond strength while maintaining heat resistance.
3Reliability
If a strong acid, aluminum metal or the like is added as a catalyst for crosslinking reaction, then water resistance is improved, but strength deterioration and staining occur
Solution Approach 1:
The invention enables the protective colloid to perform self-crosslinking through its inherent oxygen-containing functional groups in the structural units (formulas I-IV). This self-service mechanism eliminates the need for external strong acid catalysts or aluminum metal, preventing staining and strength deterioration while achieving water resistance.
Solution Approach 2:
The oxygen-containing functional groups in the structural units (formulas I-IV) act as intermediaries that facilitate crosslinking reactions without requiring strong acid catalysts. These functional groups mediate the crosslinking process, providing water resistance while avoiding the harmful effects of traditional catalysts.
4Ease of manufacture
If conventional vinyl acetate polymer resin is used, then ease of manufacture is maintained, but viscosity stability and stain resistance are insufficient
Solution Approach 1:
The invention changes the chemical structure parameters of the polymer by introducing specific structural units (formulas I-IV) into the PVA protective colloid. This structural modification improves viscosity stability and stain resistance while maintaining ease of manufacture, as the modified PVA can still be used in conventional vinyl acetate polymerization processes.
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 composition achieves excellent heat resistance, water resistance, hot water resistance, boiling water resistance, and viscosity stability, while also providing stain resistance, making it suitable for adhesive applications in woodworking, paper processing, and paints.
Implementation Method 1
a cyclic acid anhydride (E)... which enhances heat resistance, water resistance, hot water resistance, boiling water resistance, and viscosity stability
Implementation Method 2
the aqueous emulsion (D) includes a polymer (X) having an ethylenically unsaturated monomer (B)... at least one selected from the polyvinyl alcohol resin (A) and the polymer (X) has, in a main chain thereof, a structural unit derived from a monomer (C)
Data Source
AI summary
The present invention provides an aqueous emulsion composition excellent in heat resistance, water resistance, hot water resistance, boiling water resistance, and viscosity stability and also excellent in stain resistance. The present invention relates to an aqueous emulsion composition including an aqueous emulsion (D) and a cyclic acid anhydride (E). The aqueous emulsion (D) includes a polymer (X) having an ethylenically unsaturated monomer (B), a polyvinyl alcohol resin (A), and water. At least one selected from the polyvinyl alcohol resin (A) and the polymer (X) has, in a main chain thereof, a structural unit derived from a monomer (C) represented by the following formula (I), (II), (III), or (IV). (The definitions of the symbols in the formulae are omitted.)