Organic fine particle
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Solution Overview
Problem
Existing methods struggle to impart high water-repellency to substrates using organic fine particles due to the difficulty in synthesizing hydrophobic organic fine particles without emulsifiers, and color deepening agents often compromise water-repellency in synthetic fibers.
Innovation Solution
The development of organic fine particles with a polymer structure comprising hydrophobic monomers, (meth)acrylic monomers with polydimethylsiloxane groups, reactive or hydrophilic monomers, and crosslinkable monomers, which adhere to substrates to provide water-repellency with contact angles of 100 degrees or more and falling speeds of 100 mm/s or more, while maintaining color depth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluororesin coating is used to impart water-repellency, then water contact angle reaches about 120°, but fluorine-containing compounds are required which are being phased out
Solution Approach 1:
The invention changes the chemical composition parameters by using hydrophobic inorganic fine particles (such as silica) with specific surface treatments instead of fluororesins. The particles are treated with hydrophobic agents to achieve high water contact angles (150° or more) without using fluorine-containing compounds, thus resolving the contradiction between maintaining water-repellency performance and eliminating harmful fluorine substances
Solution Approach 2:
The invention creates a composite material system combining inorganic fine particles (providing structural framework and hydrophobicity) with polymer coatings (providing adhesion and durability). This composite approach allows achieving ultra-water-repellency through the synergistic effect of the particle structure and hydrophobic surface treatment, replacing conventional fluororesin coatings
2Reliability
If hydrophobic inorganic fine particles are used, then water-repellency is achieved, but a large amount of dispersant such as emulsifier is required
Solution Approach 1:
The hydrophobic inorganic fine particles possess inherent hydrophobic properties that enable them to self-disperse in water to a certain extent without requiring large amounts of external dispersants. The surface treatment of the particles creates natural repulsion between particles, reducing aggregation and minimizing the need for additional emulsifying agents
Solution Approach 2:
The invention optimizes the surface treatment parameters of the inorganic fine particles to achieve balanced hydrophobicity and dispersibility. By controlling the type and amount of hydrophobic agents applied to the particle surfaces, the system achieves adequate dispersion in water while maintaining high water-repellency, reducing dispersant requirements compared to conventional approaches
3Ease of operation
If hydrophobic inorganic fine particles with reduced hydrophobicity are used, then dispersion in water becomes easier, but the water-repellent performance is reduced
Solution Approach 1:
The invention precisely controls the hydrophobicity parameters of the inorganic fine particles by adjusting the type, amount, and molecular structure of surface treatment agents. This optimization creates a balance where particles maintain sufficient hydrophobicity for high water-repellent performance (water contact angle ≥150°) while achieving adequate water dispersibility for practical application
Solution Approach 2:
The invention uses composite structures where the core inorganic particles provide structural stability and the surface treatment layer provides controlled hydrophobicity. This composite approach allows tuning the hydrophobicity parameter to achieve both good dispersion and high water-repellent performance simultaneously
4Illumination intensity
If conventional organic fine particles are used, then color deepening effect is achieved, but water-repellency is insufficient
Solution Approach 1:
The invention creates a composite system combining organic fine particles (providing color deepening through light scattering and absorption) with hydrophobic inorganic fine particles (providing water-repellency). The organic particles fill the spaces between inorganic particles, enhancing color effects, while the hydrophobic inorganic particles provide the water-repellent framework, achieving both functions simultaneously
Solution Approach 2:
The invention merges the functions of color enhancement and water-repellency into a single coating system. By combining organic fine particles for optical effects with hydrophobic inorganic particles for water-repellency, the system achieves both color deepening and high water contact angles in one application
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 organic fine particles achieve excellent water-repellency on substrates, particularly textiles, with high contact angles and falling speeds, and can enhance color depth without reducing water-repellency, offering improved performance over inorganic particles and traditional fluorine-based treatments.
Implementation Method 1
The organic fine particles can adhere to the substrate under a state having a particle shape
Implementation Method 2
the polymer has a repeating unit formed from: (1) a hydrophobic monomer having one ethylenically unsaturated double bond and at least one hydrocarbon group having 3 to 40 carbon atoms
Data Source
AI summary
An organic fine particle capable of adhering to a substrate under a state having a particle shape, wherein the organic fine particle, when adhered to a substrate, exhibits water-repellency on the substrate, and the organic fine particle is formed of a fluorine-free polymer. Also disclosed is an organic fine particle containing: (1) a hydrophobic monomer which has one ethylenically unsaturated double bond and at least one hydrocarbon group having 3-40 carbon atoms; or (2) a polymer which has a repeating unit formed from a (meth)acrylic monomer having a polydimethylsiloxane group. Also disclosed is a method for producing the organic fine particle and a water-repellent composition which is an aqueous dispersion of the organic fine particle. Also disclosed is a textile product and method for treating the same which includes applying a treatment liquid containing the water-repellent composition to the textile product.