Polysiloxane Coating Fluid for Low-Temperature Abrasion-Resistant Films
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Solution Overview
Problem
Existing heat curable coating fluids for forming protective films on plastic substrates require high temperatures for adequate curing, which can damage thin plastic films and do not provide sufficient abrasion resistance, and photocurable alternatives are inadequate for low temperature applications.
Innovation Solution
A coating fluid comprising a polysiloxane obtained by condensation polymerization of specific silicon compounds, which is curable at temperatures as low as 40-70°C, providing excellent abrasion resistance and storage stability, and can form water repellent films with low refractive indices suitable for antireflection substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If heat curable coating fluid is used to form protective film on plastic substrate, then abrasion resistance is improved, but heat treating temperature must be high which damages thin plastic films
Solution Approach 1:
The invention changes the chemical composition parameters of the coating fluid by using specific silicon compounds (tetraalkoxysilane with 0.01-0.5 mol fraction, trialkoxysilane with 0.5-1.0 mol fraction) and controlling the condensation polymerization process to enable curing at lower temperatures (40-70°C) while maintaining film strength and abrasion resistance
Solution Approach 2:
The invention creates a composite coating system combining organic polysiloxane components with inorganic silane compounds, forming a hybrid film structure that achieves both low-temperature curability and high abrasion resistance through synergistic effects of the composite material system
2Object-affected harmful factors
If heat treating temperature is lowered to protect thin plastic films, then substrate damage is prevented, but the film is not sufficiently cured and adequate abrasion resistance cannot be obtained
Solution Approach 1:
The invention optimizes the molecular structure parameters of the polysiloxane components and the condensation reaction conditions to achieve sufficient crosslinking density and film curing at temperatures as low as 40-70°C, thereby preventing substrate thermal damage while ensuring adequate abrasion resistance through proper chemical composition design
3Temperature
If photocurable coating fluid is used to avoid heat treatment, then substrate heat damage is prevented, but it is inadequate for thin plastic films requiring low temperature treatment
Solution Approach 1:
The invention replaces the photocuring mechanism with a thermal condensation polymerization mechanism using silane compounds, which can proceed at very low temperatures (40-70°C) through controlled chemical reactions, providing a more suitable curing approach for temperature-sensitive thin plastic films while ensuring adequate film formation and performance
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 coating fluid achieves sufficient curing and abrasion resistance at low temperatures, making it suitable for thin plastic films and antireflection applications without damaging the substrates, and exhibits excellent storage stability and antifouling properties.
Implementation Method 1
a polysiloxane obtained by condensation polymerization of an alkoxy group-containing silicon compound
Implementation Method 2
capable of forming a water repellent film
Data Source
AI summary
To provide a coating fluid for forming a film, which is curable sufficiently by heat treatment at a low temperature of at most 70° C. to form a cured film excellent in abrasion resistance and which is excellent in storage stability, a film obtained from the coating fluid for forming a film, and a process for forming the film.A coating fluid for forming a film, which comprises a polysiloxane (A) obtained by condensation polymerization of a silicon compound of the formula (1) as the essential component, and a compound (B) of the formula (2):Si(OR1)4 (1)wherein R1 is a C1-5 hydrocarbon group,each of R2, R3, R4 and R5 which are independent of one another, is a hydrogen atom or a C1-12 organic group.