Method for coating a textile medium
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Solution Overview
Problem
Existing methods for coating textile materials with silicone compositions face challenges such as high energy consumption, limited applicability to fragile substrates, and the generation of volatile organic compounds during crosslinking.
Innovation Solution
A method involving the use of a silicone composition crosslinkable by polyaddition reactions, comprising organopolysiloxanes with alkenyl groups and SiH units, along with a UV-activatable hydrosilylation catalyst, which is deposited on an open-work or elastic textile medium and crosslinked using UV radiation from a UV-LED lamp.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If thermal energy is used to crosslink silicone composition, then crosslinking speed is improved, but energy consumption increases and fragile substrates are damaged
Solution Approach 1:
The patent replaces thermal energy (heat) with UV radiation (electromagnetic energy) to initiate crosslinking. The UV-LED lamp provides specific wavelength radiation that activates the photoinitiator in the silicone composition, triggering crosslinking at ambient temperature without requiring high-temperature ovens, thus reducing energy consumption and protecting heat-sensitive substrates.
Solution Approach 2:
The patent changes the activation parameter from thermal energy to UV radiation wavelength. By formulating the silicone composition with photoinitiators sensitive to UV-LED wavelengths and adjusting the crosslinker ratio, the system achieves rapid crosslinking under UV irradiation at low temperature, resolving the contradiction between crosslinking speed and energy consumption.
2Productivity
If thermal energy is used to crosslink silicone composition, then crosslinking speed is improved, but substrate integrity deteriorates
Solution Approach 1:
The patent substitutes thermal crosslinking with UV-radiation-induced crosslinking. The UV-LED lamp emits radiation at wavelengths that activate the photoinitiator without generating significant heat, allowing rapid crosslinking (improving productivity) while maintaining the integrity of heat-sensitive substrates like thermoplastic materials and textile lace.
Solution Approach 2:
The patent changes the crosslinking activation parameter from temperature to UV wavelength. The silicone composition is formulated with photoinitiators that respond to UV-LED wavelengths, enabling crosslinking to proceed rapidly at ambient temperature, thus preserving substrate integrity while maintaining high crosslinking speed.
3Use of energy by moving object
If condensation crosslinking is used, then energy consumption is reduced, but volatile organic compounds are generated
Solution Approach 1:
The patent replaces condensation crosslinking (chemical reaction releasing volatile byproducts) with addition crosslinking initiated by UV radiation. The silicone composition uses vinyl-functional polysiloxane and SiH units that crosslink via hydrosilylation reaction when exposed to UV-LED radiation, eliminating the generation of volatile organic compounds while maintaining low energy consumption.
Solution Approach 2:
The patent changes the crosslinking mechanism from condensation to addition polymerization. By adjusting the chemical composition to include vinyl groups and SiH units with appropriate photoinitiators, the system achieves crosslinking through UV activation without producing volatile byproducts, resolving the contradiction between energy efficiency and environmental harm.
4Object-generated harmful factors
If polyaddition crosslinking is used, then volatile organic compounds are eliminated, but crosslinking speed decreases
Solution Approach 1:
The patent enhances polyaddition crosslinking speed by using UV radiation to activate the reaction. The UV-LED lamp provides energy to initiate and accelerate the hydrosilylation reaction between vinyl groups and SiH units, achieving rapid crosslinking without producing volatile organic compounds, thus resolving the contradiction between eliminating harmful emissions and maintaining productivity.
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
This method achieves high productivity with low energy consumption, allows for coating of fragile substrates, and results in a silicone elastomer with excellent skin adhesion, non-slip properties, and resistance to washing and friction.
Implementation Method 1
crosslinked by irradiation with UV radiation, the source of which is a UV-LED lamp
Implementation Method 2
silicone composition which is crosslinkable by polyaddition reactions... crosslinked by irradiation with UV radiation
Data Source
AI summary
The present invention relates to a coating method wherein a silicone composition crosslinkable by polyaddition reactions is used to form a silicone elastomer on an open-work and/or elastic textile medium. The crosslinking of the silicone composition is obtained by irradiating with UV radiation, the source of which is a UV-LED lamp.