Dye Granules for Laundry Detergents
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Solution Overview
Problem
There is a need for simpler methods to incorporate blue and violet dyes into granular laundry detergents that are storage stable and provide effective shading benefits with reduced dye migration and acceptable dye deposition on fabrics during domestic washing.
Innovation Solution
A granular laundry detergent composition is formulated with dye granules containing 20-60% shading dye, 40-80% dispersant, 5-50% surfactant, 5-50% builder, and 0.05-50% water-soluble carrier, with the dye granules having an average particle size of 0.1-300 microns, and using alkali metal salts like sodium as a dispersant, which are produced by spray drying and post-dosed into the powder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional methods are used to incorporate dyes into granular laundry detergents, then dye deposition on fabric can be achieved, but dye migration in the formulation increases and storage stability decreases
Solution Approach 1:
The patent introduces a water-soluble carrier salt as an intermediary substance that facilitates dye delivery. The carrier salt dissolves in water during washing to release the dye, preventing direct contact between dye molecules and the detergent matrix during storage. This mediator approach resolves the contradiction by enabling controlled dye release while maintaining storage stability and reducing dye migration.
Solution Approach 2:
The patent changes the physical and chemical parameters of dye incorporation by using low concentrations (0.00005 to 0.2 wt%) combined with water-soluble carrier salts. This parameter change allows the dye to remain stable during storage while becoming soluble and active during washing, thus reducing dye migration while maintaining effective dye deposition.
2Device complexity
If simpler methods are used to incorporate dyes, then formulation complexity is reduced, but dye deposition effectiveness may be compromised
Solution Approach 1:
The patent achieves simple formulation with precise dye deposition by optimizing concentration parameters (0.00005 to 0.2 wt% dye) and using water-soluble carrier salts. This parameter optimization allows effective dye delivery through a simple granular structure without requiring complex delivery mechanisms, resolving the contradiction between simplicity and effectiveness.
3Ease of manufacture
If higher dye concentrations are used, then shading effect is enhanced, but dye migration increases and storage stability decreases
Solution Approach 1:
The patent changes the concentration parameter to low levels (0.00005 to 0.2 wt%) and combines it with water-soluble carrier salts that control dye release timing. This parameter change allows effective shading during washing while preventing dye migration and maintaining storage stability, as the dye remains bound to the carrier during storage and only releases during washing.
Solution Approach 2:
The patent incorporates the dye with the water-soluble carrier salt in advance during manufacturing, creating a pre-prepared delivery system. This preliminary action ensures the dye is properly bound and protected during storage, preventing migration while maintaining the ability to deliver effective shading during washing.
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 composition achieves reduced dye migration and effective dye deposition on fabrics, providing a stable and efficient shading effect on white garments, with improved storage stability and performance under domestic washing conditions.
Implementation Method 1
40 to 80 wt% of a dispersant selected from: ligninsulphonates; alkali metal salts of the condensation products of naphthalenesulphonic acids and formaldehyde; polyvinylsulphonates; and, ethoxylated novolacs
Implementation Method 2
from 5 to 50 wt% of a surfactant
Implementation Method 3
from 5 to 50 wt% builder selected from: calcium sequestrant materials; precipitating materials; and, calcium ion-exchange materials
Data Source
AI summary
The present invention concerns a shading dye containing granule.