Halogenated polyurethane coating compositions
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Solution Overview
Problem
Inkjet printing on fabric media often results in coatings that form continuous films, leading to bending or wrapping lines when folded, packaged, or shipped, and these coatings can increase flammability, while also lacking durability and resistance to scratches and abrasions.
Innovation Solution
A coating composition comprising an aqueous liquid vehicle, a cross-linkable polymeric binder, and a halogenated polyurethane dispersion is applied to fabric substrates, forming a coating that adheres to individual yarn strands without creating a continuous film, thereby maintaining void spaces and providing flexibility, durability, and flame retardancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a coating is applied to fabric media to improve durability and scratch resistance, then the coating forms a continuous film that increases strength, but it creates bending or wrapping lines when folded and reduces flexibility
Solution Approach 1:
The coating composition is designed to form a porous, non-continuous film structure on the fabric media. This allows the coating to adhere to individual yarn strands while maintaining void spaces between strands, providing durability and scratch resistance without creating bending lines when folded. The porous structure preserves fabric flexibility while delivering protective properties.
2Reliability
If conventional coatings are applied to fabric media, then they provide basic protection, but they increase flammability and fail to meet industrial flame retardancy standards
Solution Approach 1:
The coating composition utilizes a composite system comprising an aqueous liquid vehicle, cross-linkable polymeric binder, and halogenated polyurethane dispersion. This composite material provides protective functions including durability, scratch resistance, and flame retardancy while maintaining fabric flexibility. The halogenated polyurethane component specifically addresses flammability concerns by meeting industrial flame retardancy standards.
3Object-affected harmful factors
If halogenated polymers are used to achieve flame retardancy, then flame resistance is improved, but harmful halogen compounds may be released
Solution Approach 1:
The patent employs halogenated polyurethane dispersion with specific molecular weight ranges and structural characteristics that modify the thermal decomposition behavior. By controlling the polymer parameters including the type and amount of halogen atoms, the coating achieves flame retardancy while minimizing the release of harmful halogen compounds during normal use and decomposition.
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 solution enhances the flexibility and durability of coated fabric media, reduces the occurrence of bending lines, and meets industrial flame retardancy standards without releasing harmful halogen compounds, while maintaining good print quality and resistance to scratches and abrasions.
Implementation Method 1
forming a coating that adheres to individual yarn strands without creating a continuous film
Implementation Method 2
a cross-linkable polymeric binder
Data Source
AI summary
The present disclosure describes coating compositions containing halogenated polyurethanes, coated fabric media, and methods of making coated fabric media. In one example, a coating composition incudes an aqueous liquid vehicle, a cross-linkable polymeric binder, and a halogenated polyurethane dispersion. The halogenated polyurethane dispersion includes a polyurethane polymer strand having a halogen atom covalently bonded to the polyurethane polymer strand.