Surface Treatment Liquid for Rapid Water Wetting
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Solution Overview
Problem
Conventional surface treatment liquids struggle to achieve a low water contact angle on treated surfaces immediately after water contact, requiring a significant amount of time for the surface to become wetted.
Innovation Solution
A surface treatment liquid comprising a polymer with a hydrophilic constituent unit derived from a monomer with a Log P value of 0.5 or less and a constituent unit from a monomer giving a homopolymer with a glass transition temperature of 120° C or higher, used in conjunction with a solvent, to facilitate quick wetting and spreading of water on treated surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional surface treatment liquids are used, then the surface can be treated with existing formulations, but water takes a long time to wet and spread over the treated surface
Solution Approach 1:
The invention changes the chemical parameters of the surface treatment liquid by using a polymer with specific molecular weight (500-20,000) and specific monomer composition (Log P ≤ 0.5) to achieve rapid wetting. This parameter optimization allows water to quickly wet and spread over the treated surface, resolving the contradiction between maintaining formulation effectiveness and achieving fast wetting speed.
2Stability of the object's composition
If the polymer molecular weight is increased to improve coating stability, then the coating becomes more stable, but the wetting speed decreases
Solution Approach 1:
The invention identifies the optimal molecular weight range (500-20,000) that balances coating stability and wetting speed. By controlling this parameter, the polymer forms a stable coating while maintaining sufficient chain mobility for rapid water wetting and spreading, thus resolving the contradiction between stability and speed.
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 solution enables water to quickly wet and spread over treated surfaces, reducing the likelihood of tackiness and achieving a low water contact angle within seconds of water contact, while maintaining a weight average molecular weight of the polymer between 500 and 20,000.
Implementation Method 1
surfaces of various articles have been subjected to hydrophilization treatments using various surface treatment liquids in order to modify properties of the surfaces
Implementation Method 2
water quickly wets and spreads over a surface-treated surface of an object to be treated
Data Source
AI summary
Provided are: a surface treatment liquid with which it is possible to conduct a surface treatment of an object to be treated, so that water, upon contact with the treated surface, rapidly spreads on and wets the surface; a surface treatment method for treating an object using the surface treatment liquid; and a method for producing a roll-shaped sheet which has been surface-treated by the surface treatment method. The surface treatment liquid comprises a polymer (A) and a solvent(S), wherein the polymer (A) comprises a constituent unit (a1) which is derived from a monomer having a log P value of 0.5 or less and which has a hydrophilic group and a constituent unit (a2) derived from a monomer that gives a homopolymer having a glass transition temperature (Tg) of 120° C. or higher, and the polymer (A) has a weight-average molecular weight of 500-20,000.