Urethane Silicone Acrylic Coating Slidability Transparency
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Solution Overview
Problem
Existing emulsion-type coating compositions fail to effectively impart slidability while maintaining transparency and abrasion resistance, particularly when combining urethane-based or acrylic-based emulsions with silicone-based resins, often resulting in deteriorated performance or whitening of the coated film.
Innovation Solution
A coating composition is developed by blending a urethane-based emulsion with a specific silicone-acrylic graft copolymer resin emulsion in a predetermined ratio, where the silicone-acrylic graft copolymer resin has a polyorganosiloxane to acrylic acid ester unit weight ratio of 30:70 to 99:1, and an average particle size of 50 to 180 nm, to achieve improved slidability and transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If silicone-based resins are used as the coating agent to impart slidability, then slidability is improved, but transparency deteriorates due to whitening of the coated film
Solution Approach 1:
The patent changes the particle size parameter of the silicone-based resin emulsion to 180 nm or less, and adjusts the weight ratio of polyorganosiloxane to acrylic acid ester unit to 30:70 to 99:1. These parameter changes enable the silicone-based resin to impart slidability while maintaining transparency by preventing light scattering that causes whitening.
Solution Approach 2:
The patent creates a composite coating composition by blending silicone-based resin emulsion with urethane-based resin emulsion in a specific ratio (1 to 40% by weight of solid content). This composite approach combines the slidability of silicone with the film-forming ability of urethane-based resins, achieving both transparency and slidability simultaneously.
2Strength
If a mixture of urethane-based emulsion and silicone-based resin is used as the coating agent, then film-forming ability is maintained, but slidability performance deteriorates
Solution Approach 1:
The patent specifies precise parameter ranges: silicone-based resin emulsion at 1 to 40% by weight of solid content, particle size of 180 nm or less, and polyorganosiloxane to acrylic acid ester unit weight ratio of 30:70 to 99:1. These optimized parameters ensure that the silicone component effectively imparts slidability while the urethane-based resin maintains film-forming ability.
Solution Approach 2:
The patent creates local quality differentiation within the coating composition by having the silicone-based resin emulsion particles (180 nm or less) dispersed throughout the urethane-based resin matrix. This localized distribution allows the silicone to provide slidability at specific points while the overall film structure maintains film-forming ability.
3Object-affected harmful factors
If silicone-based resin is added to urethane-based emulsion to impart slidability, then water repellency is improved, but transparency and slidability performance have room for improvement
Solution Approach 1:
The patent optimizes the particle size of silicone-based resin emulsion to 180 nm or less and adjusts the polyorganosiloxane to acrylic acid ester unit weight ratio to 30:70 to 99:1. These parameter changes enhance water repellency through the silicone component while preventing light scattering that would reduce transparency.
Solution Approach 2:
The patent uses a silicone-acrylic graft copolymer resin that copies the beneficial properties of pure silicone-based resins (water repellency and slidability) while eliminating the whitening effect. The graft copolymer structure allows the silicone chains to be integrated within an acrylic framework, maintaining transparency.
Data Source
AI summary
A coating composition contains: (A) 60 to 99% by weight of a urethane-based resin emulsion having film-forming ability in terms of a solid content ratio; and (B) 1 to 40% by weight of a silicone-acrylic graft copolymer resin emulsion having an average particle size of 180 nm or less in terms of a solid content ratio, wherein a weight ratio of a polyorganosiloxane represented by a specific chemical formula to an acrylic acid ester unit or a methacrylic acid ester unit is 30:70 to 99:1.