Oil-Based Ink Composition Stability on PVC Substrates
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Solution Overview
Problem
Conventional oil-based inks for ink jet recording, particularly those containing polyalkylene glycol dialkyl ether as a solvent and quinacridone pigment, face stability issues due to crystallization and deposit formation, leading to clogged nozzles and reduced image quality on polyvinyl chloride substrates.
Innovation Solution
An oil-based ink composition using polyalkylene glycol dialkyl ether as the main solvent, combined with a lactone solvent, a binder resin, and a dispersant, where the concentration of a specific component detected by high-speed liquid chromatography is 0.4 ppm or less, ensuring improved stability and preventing recrystallization and coarse particle deposits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyalkylene glycol dialkyl ether is used as main solvent with quinacridone pigment, then water resistance and light fastness are improved, but crystallization and deposit formation occur reducing storage stability
Solution Approach 1:
The invention changes the chemical parameters of the solvent system by selecting specific polyalkylene glycol dialkyl ether compounds with controlled molecular weight and structure (formula: CH3-(OCH2CH2)n-O-R where R is alkyl with 1-4 carbons and n is 2-10). This parameter optimization ensures adequate solubility of quinacridone pigment while maintaining water resistance and light fastness, preventing crystallization during storage.
Solution Approach 2:
The invention uses a composite solvent system combining polyalkylene glycol dialkyl ether with specific additives including surfactants (0.1-5% by weight) and resins (5-50% by weight). This composite formulation enhances pigment dispersion and solubility, preventing deposit formation while maintaining the desired water resistance and light fastness properties.
2Productivity
If conventional solvents with low boiling points are used, then fast drying is achieved, but nozzle clogging occurs
Solution Approach 1:
The invention optimizes the boiling point parameter of the main solvent by selecting polyalkylene glycol dialkyl ethers with moderate boiling points (higher than conventional solvents like toluene or hexane). This parameter change provides a balance: the solvent evaporates sufficiently fast to maintain productivity while its higher boiling point prevents premature drying and nozzle clogging.
3Reliability
If solvents with high solubility in plastics are used, then ink storage container compatibility is improved, but printer component swelling and cost increase occur
Solution Approach 1:
The invention changes the solubility parameter of the solvent system by selecting polyalkylene glycol dialkyl ethers with controlled hydrophobicity (through selection of R group and n value). This provides adequate compatibility with standard plastic containers while avoiding excessive solubility that would cause swelling of printer components like polystyrene or ABS resin, thereby reducing equipment costs.
4Reliability
If quinacridone pigment is added to polyalkylene glycol dialkyl ether solvent, then color fastness is improved, but recrystallization and coarse particle deposits occur
Solution Approach 1:
The invention optimizes the molecular weight and structural parameters of the polyalkylene glycol dialkyl ether to achieve optimal solubility for quinacridone pigment. The specific formula CH3-(OCH2CH2)n-O-R with n=2-10 provides sufficient solvation power to prevent pigment recrystallization while maintaining the desired color fastness properties.
Solution Approach 2:
The invention introduces surfactants as intermediary substances (0.1-5% by weight of the composition) that mediate between the hydrophobic quinacridone pigment and the polyalkylene glycol dialkyl ether solvent. These surfactants enhance pigment wetting and dispersion, preventing coarse particle formation and maintaining long-term dispersion stability.
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 ink composition demonstrates enhanced stability during storage and jetting, reducing the risk of nozzle clogging and improving image quality on polyvinyl chloride substrates, with the chromatographic method providing a pre-assessment for potential recrystallization and particle coarsening risks.
Implementation Method 1
analyzed by means of high speed liquid chromatography under the following measuring conditions
Data Source
Figure 1
AI summary
The invention provides an oil-based ink composition for ink jet recording, which is best suited for printing onto polyvinyl chloride substrates, and improved in terms of both the stabilities of ink on storage and jetting, and a method for inspecting the same. The oil-based ink composition for ink jet recording comprises as a main solvent at least a specific polyalkylene glycol dialkyl ether and containing at least a specific quinacridone pigment component. That composition should be such that when a measuring sample comprising it is analyzed by means of high speed liquid chromatography under specific measuring conditions, the concentration of a component having a peak at the holding time of 10.3 minutes is 0.4 ppm or less.