Cationic Polysaccharide Anti-Spotting in Dishwashing Detergents
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Solution Overview
Problem
Automatic dishwashing detergents face challenges with the formation of spots and films on glassware, particularly due to carbonate and phosphate salts, which are not environmentally friendly, and existing surfactant solutions are not ideal.
Innovation Solution
Incorporating cationic guar, cationic guar ether, or cationic guar ester with an average molecular weight less than 1,000,000 g/mol into detergent compositions to prevent or reduce spotting and filming, while potentially replacing part or all of the surfactants, maintaining or enhancing anti-filming and anti-spotting effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carbonate and phosphate salts are used in detergent compositions, then cleaning efficacy is improved, but filming on glassware increases
Solution Approach 1:
The patent introduces cationic polysaccharides as intermediary substances that mediate between the cleaning agents (carbonate/phosphate salts) and the glassware surface. These polysaccharides interact with the mineral salts to prevent film formation while allowing the salts to maintain their cleaning function, thus resolving the contradiction between cleaning efficacy and filming prevention
2Reliability
If surfactants are used to prevent spotting and filming, then glassware appearance is improved, but environmental friendliness deteriorates
Solution Approach 1:
The patent changes the chemical parameter of the anti-spotting agent from synthetic surfactants to natural cationic polysaccharides. This parameter change maintains the functional effect of preventing spotting and filming while improving environmental compatibility, as polysaccharides are biodegradable and less harmful to the environment compared to conventional surfactants
3Reliability
If high molecular weight cationic polysaccharides (greater than 1,000,000 g/mol) are used, then anti-spotting effect is achieved, but viscosity and handling difficulty increase
Solution Approach 1:
The patent optimizes the molecular weight parameter of cationic polysaccharides to be less than 1,000,000 g/mol. This parameter optimization maintains the essential anti-spotting functionality while significantly improving viscosity characteristics and handling properties, making the polysaccharides easier to formulate into detergent compositions and process during manufacturing
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 cationic polysaccharides effectively reduces or eliminates spotting and filming on glassware, improving the brightness and water anti-redeposition properties of dishes, and provides a more environmentally friendly alternative to traditional surfactants.
Implementation Method 1
The spots correspond to water traces left after the water evaporation... The film corresponds to a uniform deposition all over the glassware surface... cationic polysaccharide which reduces or eliminates the formation of spots and films
Data Source
AI summary
The present invention relates to an Automatic Dishwashing (ADW) detergent composition comprising at least one cationic polysaccharide of molecular weight of less than 1,000,000 g/mol. The invention also relates to a method for eliminating, limiting or preventing the spotting and/or filming phenomena during the washing comprising the use of a detergent composition according to claim 1.