Silicone-Acrylic Core-Shell Emulsion for Transparent Slidability
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Solution Overview
Problem
Existing emulsion compositions that combine silicone resin with urethane, acryl, or vinyl chloride emulsions for coating applications face challenges in achieving both high transparency and slidability, with previous solutions either impairing the intrinsic properties of the resins or requiring complex preparation processes.
Innovation Solution
An emulsion composition comprising a predetermined ratio of a resin with film-forming properties and a silicone-acrylic core-shell resin, where the core is composed of organopolysiloxane and the shell of poly(meth)acrylate ester, with a specific mass ratio and covering ratio, is used to create a coating agent that provides improved transparency and slidability without compromising the substrate's appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If silicone resin is used as a coating agent to provide slidability, then slidability is improved, but the coating film becomes opaque (white appearance)
Solution Approach 1:
The invention divides the silicone resin system into two separate emulsions: one containing the silicone resin for slidability and another containing the film-forming resin for transparency. These emulsions are mixed in specific ratios (silicone resin emulsion 1-50 parts by mass, film-forming resin emulsion 50-99 parts by mass) to achieve both slidability and transparency simultaneously, avoiding the white appearance problem of pure silicone resin coatings.
Solution Approach 2:
The invention creates a composite coating system by combining silicone resin emulsion with film-forming resin emulsion (urethane, acryl, or vinyl chloride). This composite approach allows the coating film to exhibit both the slidability characteristics of silicone resin and the transparency properties of the film-forming resin, resolving the contradiction between these two properties.
2Illumination intensity
If silicone resin is mixed with urethane, acryl, or vinyl chloride emulsion to maintain transparency, then transparency is improved, but the slidability and intrinsic properties of the resins are impaired
Solution Approach 1:
Rather than mixing silicone resin directly with film-forming resin (which impairs slidability), the invention segments the system into separate emulsions that are combined in controlled proportions. The silicone resin emulsion contains 10-50 parts by mass of silicone resin and 50-90 parts by mass of water, while the film-forming resin emulsion contains the transparent resin components. This segmentation preserves the intrinsic properties of both resin types while achieving transparency.
Solution Approach 2:
The invention changes the physical state and composition parameters by using emulsion forms of both silicone resin and film-forming resin, with specific solid content ranges (silicone resin emulsion: 10-50% solid content, film-forming resin emulsion: 20-60% solid content). This parameter control allows the coating to maintain both transparency and slidability without the resins interfering with each other's intrinsic properties.
3Reliability
If complex emulsion preparation processes are used to achieve high transparency and slidability, then coating performance is improved, but manufacturing complexity increases
Solution Approach 1:
The invention performs preliminary action by pre-preparing standardized emulsions of silicone resin and film-forming resin with optimized compositions and solid contents. These pre-formulated emulsions can be directly mixed in specified ratios (silicone resin emulsion 10-50 parts by mass, film-forming resin emulsion 50-90 parts by mass) to achieve the desired coating performance, simplifying the overall manufacturing process while maintaining high transparency and slidability.
Data Source
AI summary
One object of the present invention is to provide an emulsion composition comprising a silicone and an emulsion of a resin having a film forming property, which emulsion composition may provide a coating agent which effectively exhibits slidability of silicone on a substrate, while maintaining transparency. Another object of the present invention is to provide a laminate having a film made of the coating agent. The present invention provides an emulsion composition comprising (I) an emulsion of a resin having a film forming property in a solid content of 60 to 99.9 parts by mass and (II) an emulsion of a silicone-acrylic core-shell resin in solid content of 0.1 to 40 parts by mass, a total mass of the solid contents of components (I) and (II) being 100 parts by mass, wherein a core of the silicone-acrylic core-shell resin (II) is composed of an organopolysiloxane (A), a shell layer of the silicone-acrylic core-shell resin (II) is composed of a poly(meth)acrylate ester (B), a mass ratio of the organopolysiloxane (A) to the poly(meth)acrylate ester (B) is in a range of 40:60 to 95:5, and a covering ratio by the poly(meth)acrylate ester on a surface of the silicone-acrylic core-shell resin is at least 50%.