Sprayable Liquid Dressing Film to Prevent Nozzle Clogging
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Solution Overview
Problem
Existing liquid dressings for open wounds suffer from nozzle clogging, breathability issues, and safety concerns during transportation, and they do not provide adequate protection against external stimuli.
Innovation Solution
A liquid dressing comprising a polysiloxane-polyurethane copolymer formed by reacting an alkoxy group-containing silicone resin with an isocyanate group-containing prepolymer, dissolved in a solvent, which includes a hydrolysis and polymerization process to create a film-forming polymer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a linear polymer compound with polyphenylhydroxysiloxane structure is used as skin protective liquid, then skin protection film can be formed, but the spray nozzle easily clogs
Solution Approach 1:
The patent changes the chemical structure parameters of the polymer from linear polyphenylhydroxysiloxane to crosslinked polysiloxane-polyurethane copolymer, and adjusts the solvent composition to a specific mixture of volatile and non-volatile solvents. These parameter changes reduce the polymer's tendency to precipitate and clog nozzles while maintaining film-forming capability
Solution Approach 2:
The patent uses a composite solvent system combining volatile solvents (e.g., alcohols, esters) and non-volatile solvents (e.g., glycols, carboxylic acids), along with a crosslinked polymer structure. This composite approach balances rapid drying, nozzle compatibility, and film quality, resolving the nozzle clogging issue while preserving protective film formation
2Productivity
If pressurized gas is used to fill the spray bottle, then spraying performance is improved, but safety risk increases during transportation
Solution Approach 1:
The patent employs a pressure-driven spray mechanism using hydraulic principles where the liquid dressing itself, when pressurized, provides the driving force for spray delivery. This eliminates or reduces the need for separate pressurized gas systems, maintaining spray performance while significantly reducing safety hazards associated with pressurized gas containers during transportation and storage
3Reliability
If a protective film is formed on the skin, then wound protection is improved, but skin breathability is compromised
Solution Approach 1:
The patent creates a protective film with a porous or micro-perforated structure through the crosslinked polysiloxane-polyurethane copolymer formulation. This porous structure allows water vapor and gases to pass through while maintaining a physical barrier against external contaminants, thus preserving skin breathability while providing effective wound protection
Solution Approach 2:
The film-forming polymer undergoes phase transition from liquid solution to solid film upon application and drying. The specific crosslinked structure and solvent composition control this transition to create a film that is permeable to water vapor, allowing breathability while maintaining protective integrity against bacteria and water
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 polysiloxane-polyurethane copolymer forms a transparent film that prevents nozzle clogging, maintains skin breathability, provides effective protection, and ensures fast drying and high retention on the skin.
Implementation Method 1
subjecting the alkoxy group-containing silicone resin and the isocyanate group-containing prepolymer to a polymerization reaction so as to obtain the film-forming polymer
Implementation Method 2
an alkoxy group-containing silicone resin which is obtained by subjecting an orthosilicate compound and an acidic aqueous solution to a hydrolysis and polymerization reaction
Data Source
AI summary
A liquid dressing includes a solvent and a film-forming polymer that is dissolved in the solvent and that is made by a process including: providing an alkoxy group-containing silicone resin which is obtained by subjecting an orthosilicate compound and an acidic aqueous solution to a hydrolysis and polymerization reaction; providing an isocyanate group-containing prepolymer which is obtained by reacting a diisocyanate compound with a hydrophilic polyether diol; and subjecting the alkoxy group-containing silicone resin and the isocyanate group-containing prepolymer to a polymerization reaction so as to obtain the film-forming polymer.