Alkaline-Stable Copolymer Coating for Porous Water and Oil Repellency
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Solution Overview
Problem
Existing surface treatment agents, such as silicone copolymers, are limited in their effectiveness in alkaline environments, which are common in industrial processes like papermaking and leather tanning, and often alter the properties of porous articles like fiber fabrics and natural stones.
Innovation Solution
A copolymer comprising specific repeating units from monomers I, II, and III, which can be polymerized to provide oil- and water-repellent properties across a wide pH range, including alkaline conditions, without altering the basic properties of the treated articles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a film-forming resin coating is applied to transform the surface, then water-repellent and oil-repellent properties are achieved, but the air permeability and appearance of porous articles are altered
Solution Approach 1:
The patent uses a thin film-forming resin coating to provide water and oil repellency while minimizing impact on the underlying porous structure. The coating forms a flexible protective layer that maintains breathability and appearance characteristics of the original material.
Solution Approach 2:
The invention employs composite resin compositions combining multiple polymer components (polyester resin, polyurethane resin, acrylic resin) with specific functional additives to achieve both water/oil repellency and preservation of air permeability. The composite formulation allows optimization of conflicting properties.
2Reliability
If existing silicone copolymers are used for surface treatment, then water-repellent and oil-repellent properties are imparted, but effectiveness is limited in alkaline environments
Solution Approach 1:
The patent modifies the chemical composition parameters of the resin system by incorporating alkaline-resistant components and adjusting pH stability ranges. The resin formulation is specifically designed to maintain its functional properties across a broader pH spectrum including alkaline conditions where traditional silicone copolymers fail.
Solution Approach 2:
The invention creates a composite resin system combining multiple polymer types with complementary properties, including components specifically selected for alkaline environment stability. This composite approach overcomes the limitations of single-component silicone copolymers in high pH conditions.
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 copolymer effectively imparts oil- and water-repellent properties to porous articles in various pH conditions, including alkaline environments, without changing their fundamental properties.
Implementation Method 1
imparting oil- and water-repellent properties to the surface of the articles
Data Source
AI summary
The present application relates to a copolymer, a composition comprising the copolymer, and a product treated with same. The copolymer comprises a repeating unit generated by a monomer I, a repeating unit generated by a monomer II and a repeating unit generated by a monomer III. The copolymer or composition comprising the copolymer can treat a plurality of articles in sizing, coating or soaking environments having a wider pH value range (acidic, neutral and alkaline), especially being alkaline, and impart oil-repellent and water-repellent functions to the articles.