Aqueous Coating Material with Colloidal Silica and High HLB Surfactant
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Solution Overview
Problem
Existing water-based paints lack sufficient weather resistance, stain resistance, and blister resistance due to insufficient content of colloidal silica, low hydrophilicity of nonionic surfactants, and limited polymerization of monomers with radically polymerizable groups.
Innovation Solution
An aqueous coating material comprising a polymer obtained by copolymerization of monomers with 0.2-10% by mass of monomers having two or more radically polymerizable groups, colloidal silica at 0.1-20 parts by mass per 100 parts of polymer, and a nonionic surfactant with an HLB value of 16 or more, enhancing stain resistance, weather resistance, and blister resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If colloidal silica is added to improve stain resistance, then stain resistance is improved, but weather resistance deteriorates due to excessive colloidal silica content
Solution Approach 1:
The patent optimizes the content of colloidal silica to a specific range (0.1 to 20 parts by mass per 100 parts by mass of polymer) and controls the HLB value of nonionic surfactant (16 or more) to achieve the balance between stain resistance and weather resistance
Solution Approach 2:
The patent creates a composite coating system combining polymer, colloidal silica, and nonionic surfactant where the components work synergistically - the surfactant modifies the interface between colloidal silica and polymer, enabling both high stain resistance and weather resistance
2Ease of manufacture
If nonionic surfactant with low HLB value is used, then manufacturing is simpler, but stain resistance and weather resistance are insufficient
Solution Approach 1:
The patent specifies using nonionic surfactant with HLB value of 16 or more, which is a specific parameter change from conventional surfactants, to achieve the required stain resistance and weather resistance while maintaining ease of manufacture
3Ease of manufacture
If monomers with two or more radically polymerizable groups are used in small amounts, then polymerization is easier to control, but stain resistance and weather resistance are insufficient
Solution Approach 1:
The patent optimizes the content of monomers with two or more radically polymerizable groups to a specific range (0.2 to 10% by mass in the monomer mixture) to achieve both controllable polymerization and improved stain resistance and weather resistance
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 coating film exhibits excellent stain resistance, weather resistance, storage stability, and blister resistance, with improved hydrophilicity and hardness, while maintaining transparency and freeze-thaw resistance.
Implementation Method 1
nonionic surfactant (III) with an HLB value of 16 or more
Implementation Method 2
colloidal silica (II)
Implementation Method 3
polymer (I) is a polymer obtained by copolymerization of monomer mixture (M) that contains 0.2 to 10% by mass of monomer (a) having two or more radically polymerizable groups
Data Source
AI summary
The present invention relates to an aqueous coating material containing polymer (I), colloidal silica (II), and nonionic surfactant (III) with an HLB value of 16 or more. The polymer (I) is obtained by copolymerization of monomer mixture (M) that contains 0.2 to 10% by mass of monomer (a) having two or more radically polymerizable groups. The solid content of the colloidal silica (II) is 0.1 to 20 parts by mass with respect to 100 parts by mass of the polymer (I). The content of the nonionic surfactant (III) is 0.01 to 10 parts by mass with respect to 100 parts by mass of the polymer (I). The present invention also relates to a painted article where the aqueous coating material is applied. Therefore, an aqueous coating material and a painted article capable of expressing stain resistance and weather resistance can be provided by reducing a water contact angle.