Azo Compound Liquid Crystalline Coating Solution for Polarizing Film Haze Reduction
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Solution Overview
Problem
Conventional polarizing films made from liquid crystalline coating solutions containing azo compounds suffer from increased haze due to the separation of fine crystals during the drying process, leading to poor transparency.
Innovation Solution
A novel azo compound with an amino naphthol skeleton and a substituent group, such as a sulfonic acid group, is used in the liquid crystalline coating solution to inhibit crystal separation, resulting in a polarizing film with reduced haze.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional azo compound is used in the liquid crystalline coating solution, then the polarizing film can be formed by casting, but fine crystals separate out during drying causing increased haze and deteriorated transparency
Solution Approach 1:
The invention modifies the chemical structure of the azo compound by introducing specific substituent groups (sulfonic acid groups at positions 2 and 4 of the naphthol ring, and hydroxyl groups at positions 2 and 4 of the other aromatic ring) to change the crystallization behavior and solubility parameters, thereby preventing fine crystal separation during drying while maintaining ease of manufacture
Solution Approach 2:
The invention creates a composite molecular structure combining azo groups with specific aromatic substituents (naphthol and phenol derivatives) to achieve both processability and optical clarity, resolving the contradiction between ease of manufacture and haze reduction
2Length of moving object
If the thickness of the polarizing film is reduced, then the transparency is improved, but the film becomes more susceptible to crystal separation and haze formation
Solution Approach 1:
By changing the molecular parameters of the azo compound through specific substituent groups, the invention enables thin films to maintain transparency without crystal separation, allowing thickness reduction without the usual penalty of increased haze
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 use of the novel azo compound in the liquid crystalline coating solution prevents fine crystal separation during drying, significantly decreasing haze and improving the transparency of the polarizing film.
Implementation Method 1
The lyotropic liquid crystal compound forms supramolecular aggregates exhibiting liquid crystallinity in the solution, so that the long axis direction of the supramolecular aggregates is oriented in a flowing direction when flowing after applying shearing stress onto the liquid crystalline coating solution containing this
Implementation Method 2
a polarizing film according to the present invention is obtained by casting the liquid crystalline coating solution in a thin film state
Data Source
AI summary
A liquid crystalline coating solution which comprises: an azo compound represented by the following general formula (1); and a solvent to dissolve the azo compound:wherein Q1 is an aryl group which may have any substituent group; Q2 is an arylene group which may have any substituent group; R is a hydrogen atom, an alkyl group having 1 to 3 carbon atoms, an acetyl group, a benzoyl group, or a phenyl group (these groups may have any substituent groups); and M is a counter ion.