Colored polypropylene resin composition and method of producing the composition
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Solution Overview
Problem
Existing polypropylene resin coloring methods result in poor color vividness, unsuitability for print processing, thick yarns, and rough texture, with anthraquinone dyes exhibiting high aggregability, insufficient color developability, and sublimation issues, and stability concerns due to raw material availability.
Innovation Solution
A colored polypropylene resin composition using specific compounds represented by general formulae (1) to (4) is colored using supercritical carbon dioxide as a medium, ensuring uniform dispersion and improved compatibility with polypropylene fibers, enhancing color developability, washing resistance, and sublimation resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If anthraquinone dye is used for coloring polypropylene resin, then coloring capability is achieved, but color vividness and washing resistance are insufficient
Solution Approach 1:
The invention changes the chemical structure parameters of the dye molecule by introducing specific substituents (alkyl groups with 1-12 carbon atoms, aryl groups, alkoxyl groups, etc.) at defined positions around the anthraquinone core. These parameter changes in molecular structure improve both color vividness and washing resistance simultaneously, resolving the contradiction between color quality and dye fastness.
Solution Approach 2:
The invention creates a composite dye molecule combining the anthraquinone chromophore with specific auxiliary groups (amino groups, hydroxyl groups, carboxyl groups, etc.) that work together to achieve both vibrant color and excellent washing resistance. The synergistic effect of these composite structural elements resolves the contradiction between color vividness and washing resistance.
2Illumination intensity
If anthraquinone dye is used for coloring polypropylene resin, then coloring capability is achieved, but sublimation resistance is insufficient due to dye sublimation at elevated temperatures
Solution Approach 1:
The invention modifies the thermal stability parameters of the dye by incorporating bulky hydrophobic groups (alkyl groups with 1-12 carbon atoms, aryl groups) that increase molecular weight and reduce vapor pressure. These parameter changes prevent dye sublimation at processing temperatures while maintaining excellent color developability, resolving the contradiction between color quality and sublimation resistance.
3Ease of manufacture
If conventional coloring methods are used for polypropylene resin, then production is simple, but color vividness and texture quality are poor
Solution Approach 1:
The invention performs preliminary action by pre-synthesizing dyes with optimized molecular structures before the coloring process. The dye molecules are designed in advance with specific substituents that ensure high color vividness and fastness properties, eliminating the need for complex post-processing or multiple dyeing steps, thus maintaining production simplicity while achieving superior color quality.
4Ease of manufacture
If conventional coloring methods are used for polypropylene resin, then production is simple, but yarn thickness and texture are unsatisfactory
Solution Approach 1:
The invention changes the physical-chemical parameters of the dye molecules by controlling molecular size, shape, and intermolecular interactions through specific substituent selection. These parameter changes enable uniform dye distribution and proper fiber penetration during simple processing, resulting in fine yarn thickness and smooth texture while maintaining production simplicity.
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 provides a colored polypropylene resin with high color developability, excellent washing resistance, and stable supply, overcoming the limitations of traditional coloring methods.
Implementation Method 1
coloring a polypropylene resin with a colorant in supercritical carbon dioxide to be used as a medium
Data Source
AI summary
Provided is a colored polypropylene resin composition, which is excellent in high color developability, washing resistance, and sublimation resistance, and can be stably supplied. The colored polypropylene resin composition includes a polypropylene resin and a colorant, and is characterized by including a compound having a predetermined structure as the colorant.