Laundry Detergent Composition with MGDA Chelant for Low pH Fabric Care
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Solution Overview
Problem
Laundry detergent powders with high pH profiles excel in cleaning but often compromise fabric care, requiring a balance to maintain both effective cleaning and fabric integrity.
Innovation Solution
A solid free-flowing particulate laundry detergent composition with a low pH profile, incorporating specific formulation features and the use of sodium salt of methylglycine diacetic acid (MGDA) as a chelant, along with other components like anionic detersive surfactants, zeolite builders, and sodium percarbonate, to achieve balanced cleaning and fabric care performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high pH profile is used in laundry detergent powder, then good cleaning performance is achieved through grease saponification and fabric fibre swelling mechanisms, but fabric care profile deteriorates with compromised fabric appearance and shape retention
Solution Approach 1:
The patent fundamentally changes the pH parameter from traditional high pH (10.5 or higher) to low pH (6.5-8.0 at 1% dilution). This parameter change enables the detergent to achieve good cleaning performance through alternative mechanisms while preserving fabric appearance and shape retention, directly resolving the contradiction between cleaning efficacy and fabric care
2Object-affected harmful factors
If low pH profile is used in laundry detergent powder, then good fabric care profile is achieved with improved fabric appearance and shape retention, but cleaning performance deteriorates with undesirable cleaning skews
Solution Approach 1:
The patent optimizes multiple parameters simultaneously: pH (6.5-8.0), chelant concentration (0.5-5% MGDA), organic acid content (4-20%), and builder ratios. These coordinated parameter changes enable low pH detergent to achieve both good fabric care and adequate cleaning performance by compensating for reduced saponification and fibre swelling through enhanced chelation and surfactant action
Solution Approach 2:
The patent creates a composite formulation system combining low pH environment with specific chelants (MGDA), organic acids, builders (zeolite, sodium carbonate, sodium silicate), and surfactants. This composite approach enables the detergent to achieve cleaning performance at low pH by synergistic interaction of multiple components, resolving the cleaning performance deficiency
3Reliability
If MGDA chelant is added to low pH detergent formulation, then cleaning performance is improved through effective calcium carbonate suspension and removal, but formulation complexity increases
Solution Approach 1:
The patent introduces MGDA chelant as an intermediary substance that mediates between the low pH environment and calcium carbonate deposits. MGDA forms soluble complexes with calcium ions, preventing redeposition and enabling effective stain removal at low pH. This intermediary approach resolves the contradiction by providing a chemical mechanism for cleaning performance without requiring high pH conditions
Solution Approach 2:
The patent optimizes the concentration parameter of MGDA (0.5-5% of detergent composition) and adjusts related parameters (organic acid content 4-20%, pH 6.5-8.0) to achieve effective cleaning performance. By optimizing these parameters, the patent achieves good cleaning efficacy with moderate formulation complexity, resolving the contradiction between performance improvement and formulation 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 composition maintains good cleaning performance while enhancing fabric appearance and care, with careful formulation ensuring effective cleaning without undesirable skews due to the low pH profile.
Implementation Method 1
sodium salt of methylglycine diacetic acid (MGDA) chelant
Implementation Method 2
sodium percarbonate
Implementation Method 3
anionic detersive surfactant
Data Source
AI summary
The present invention relates to a solid free flowing particulate laundry detergent composition comprising: (a) anionic detersive surfactant; (b) from 0wt% to 8wt% zeolite builder; (c) from 0wt% to 4wt% phosphate builder; (d) from 0wt% to 8wt% sodium carbonate; (e) from 0wt% to 8wt% sodium silicate; (f) from 4wt% to 20wt% organic acid, (g) from 1wt% to 20wt% sodium percarbonate; (h) from 0.5wt% to 5wt% bleach activator; and (i) from 0.5wt% to 5wt% sodium salt of methylglycine diacetic acid (MGDA) chelant, wherein the composition at 1wt% dilution in deionized water at 20°C, has an equilibrium pH in the range of from 6.5 to 9.0, wherein the composition comprises from 30wt% to 90wt% base detergent particle, wherein the base detergent particle comprising (by weight of the base detergent particle): (a) from 4wt% to 35wt% anionic detersive surfactant; (b) optionally, from 1wt% to 8wt% zeolite builder; (c) from 0wt% to 4wt% phosphate builder; (d) from 0wt% to 8wt% sodium carbonate; (e) from 0wt% to 8wt% sodium silicate; (f) from 1wt% to 16wt% organic acid; and (g) optionally, from 1wt% to 10wt% magnesium sulphate.