Fiber structure
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Solution Overview
Problem
Existing fiber structures lack both high air permeability and fabric density while maintaining effective water repellency and soaking resistance.
Innovation Solution
A fiber structure treated with a water-repellent compound having a hydrocarbon group of 6 to 40 carbon atoms, comprising an acrylic polymer and an isocyanate derivative, achieving a water contact angle of 100° or more, and a weight ratio of 50/50 to 80/20, with a fabric density of over 100 g/m² and air permeability of over 20 cc/cm²/sec.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If water repellent treatment is applied to fiber substrate, then water repellency is improved, but air permeability deteriorates
Solution Approach 1:
The patent applies parameter changes by specifying precise ranges for hydrocarbon group carbon atoms (6-40), fabric density (100-400 g/m²), and air permeability (>20 cc/cm²/sec) to optimize the balance between water repellency and air permeability. The water repellent compound parameters are carefully controlled to achieve both functions simultaneously.
Solution Approach 2:
The patent uses composite materials by combining the fiber substrate with a water repellent compound containing hydrocarbon groups of 6-40 carbon atoms. This composite structure allows the fabric to maintain its porous nature for air permeability while the hydrocarbon compound provides water repellency through its molecular structure.
2Reliability
If fabric density is increased to improve water repellency, then soaking resistance is improved, but air permeability deteriorates
Solution Approach 1:
The patent resolves this contradiction by optimizing the fabric density parameter within the range of 100-400 g/m² and combining it with air permeability >20 cc/cm²/sec. This parameter optimization allows the fabric to achieve both high soaking resistance and maintained air permeability through careful balance of structural properties.
Solution Approach 2:
The patent applies local quality by treating the fiber substrate surface with water repellent compound while maintaining the bulk fabric structure's porosity. The water repellent treatment is applied locally to the surface where water contact occurs, while the internal fabric structure retains its air permeability characteristics.
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 fiber structure exhibits excellent water repellency and soaking resistance, with a water repellency grade of 4 or higher and a soaking velocity of less than 10 mm/2h, while maintaining high air permeability and fabric density.
Implementation Method 1
a fiber structure comprising a fiber substrate to which a water-repellent compound having a hydrocarbon group having 6 or more and 40 or less carbon atoms is adhered
Implementation Method 2
water-repellent compound having a hydrocarbon group having 6 or more and 40 or less carbon atoms... achieving a water contact angle of 100° or more
Data Source
AI summary
A novel fiber structure exhibiting water repellency is provided by providing a fiber structure in which a water-repellent compound having a hydrocarbon group having 6-40 carbon atoms is attached to a fiber base material, the fiber structure having an air permeability of more than 20 cc/cm2/sec. and a fabric density of more than 100 g/m2. A novel water repellent agent which can be used in the production of the fiber structure is also provided.