Water Repellent Down Coating to Prevent Moisture Agglomeration
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Solution Overview
Problem
Down and feather products lose their water repellency and heat retention capabilities when exposed to moisture, leading to reduced insulation and difficulty in drying, especially when sweat or water vapor is released, causing the down to agglomerate and lose its warming function.
Innovation Solution
A water repellent layer formed by a mixture of a cross-linking agent with isocyanate or acrylic acid functional groups and a water-drawing agent with fluorocarbon or siloxane functional groups is applied to the down, using a process involving soaking, cross-linking, stirring, dehydration, and oven-drying to create a durable and long-lasting water-repellent coating that prevents agglomeration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a cleaning process is applied to remove grease from down and feather, then hygiene and usability are improved, but water repellent characteristics are reduced
Solution Approach 1:
The patent applies parameter changes by controlling the pH value of the treatment solution within 2.0-8.0 and maintaining specific temperature ranges (0-100°C) during processing. This allows the down to be cleaned while preserving or restoring water repellency through controlled chemical environment changes that don't damage the natural grease structure
Solution Approach 2:
The patent creates a composite structure by forming a coating layer on the down surface that combines cleaning agents with water repellent substances. This composite approach allows simultaneous achievement of hygiene (cleaning) and water protection (repellency) through a multi-functional material system
2Temperature
If down is exposed to moisture or sweat, then insulation function is improved for warmth, but down agglomerates and loses insulation ability
Solution Approach 1:
The patent applies preliminary anti-action by pre-treating down with water repellent substances before moisture exposure occurs. The coating layer is applied in advance to prevent water absorption and agglomeration, countering the harmful effect of moisture before it can damage the down structure
Solution Approach 2:
The patent uses a thin film coating layer formed on the down surface that acts as a flexible protective barrier. This film structure allows the down to maintain its insulation properties while resisting moisture penetration and preventing clumping, preserving the three-dimensional structure necessary for heat retention
3Reliability
If water repellent coating is applied to down, then water repellency is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges multiple functions into a single treatment solution that combines cleaning, pH adjustment, and water repellent properties. By combining these functions in one solution and one processing step, the manufacturing complexity is minimized while achieving the desired water repellent effect
Solution Approach 2:
The patent creates a universal treatment solution that performs multiple functions simultaneously: cleaning the down, adjusting pH balance, and providing water repellency. This multi-functional approach simplifies the manufacturing process by eliminating the need for separate treatment steps for each function
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 water-repellent down maintains its insulation and heat retention properties even when exposed to moisture, ensuring the down products remain effective and durable, with a simple and efficient manufacturing process that reduces processing costs and enhances production capacity.
Implementation Method 1
a water-drawing agent comprising a fluoride or siloxane functional group
Implementation Method 2
a cross-linking agent comprising an isocyanate or acrylic acid functional group
Implementation Method 3
the down is oven-dried with air heated over 120° C.
Data Source
AI summary
A method for producing water repellent down includes soaking cleaned down in an aqueous solution having a pH ranging from 4 to 7; adding to the solution a cross-linking agent composed of a material having an isocyanate or acrylic acid functional group to provide a solution having a weight ratio of the down and the cross-linking agent ranging between 1:0.005 and 1:0.06; adding to the solution a water-drawing agent composed of a material having a siloxane functional group to provide a solution having a weight ratio of the down and the water-drawing agent ranging between 1:0.01 and 1:0.1; stirring the solution for at least 15 minutes to react the cross-linking agent and the water-drawing agent and form a water repellent layer on the surface of the down; separating the down from the solution; and oven drying the down with hot air having a temperature of at least 120° C.