Pyrithione Preservative System in Solid Rinse Aids
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Solution Overview
Problem
Conventional rinse aid compositions require personal protective equipment due to the need to handle high concentrations of isothiazolinone preservatives, posing safety concerns and necessitating the development of alternative preservative systems for safe and sustainable warewashing applications.
Innovation Solution
The use of a pyrithione preservative system in solid rinse aid compositions, combined with a solid acid, short-chain alkyl benzene or alkyl naphthalene sulfonate, and nonionic surfactants, eliminates the need for personal protective equipment and provides a stable, acidic pH aqueous use solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If isothiazolinone preservative is used in conventional rinse aid compositions, then antimicrobial efficacy is achieved, but personal protective equipment is required for handling
Solution Approach 1:
The patent changes the chemical parameter from isothiazolinone to pyrithione preservative system, maintaining antimicrobial efficacy while eliminating the need for PPE. The pyrithione system achieves the same reliability in preventing microbial growth without the harmful effects that require personal protective equipment.
Solution Approach 2:
The patent extracts and removes the isothiazolinone component from the rinse aid composition and replaces it with a pyrithione preservative system. This extraction eliminates the harmful factors associated with isothiazolinone while preserving the essential antimicrobial function.
2Reliability
If high concentration of isothiazolinone preservative (220 ppm) is used in solid rinse aid product, then adequate preservation efficacy is achieved in use solution, but handling safety is compromised
Solution Approach 1:
The patent changes the preservative parameter from isothiazolinone to pyrithione, which achieves adequate preservation efficacy at lower concentrations. The pyrithione preservative system provides the same 5-15 ppm active concentration in use solution without requiring the high 220 ppm concentration of isothiazolinone, thereby improving handling safety.
3Reliability
If conventional isothiazolinone preservative system is used, then microorganism growth prevention is achieved, but skin sensitivity concerns arise
Solution Approach 1:
The patent removes the isothiazolinone component that causes skin sensitivity concerns and replaces it with a pyrithione preservative system. This extraction eliminates the allergenic properties of isothiazolinone while maintaining the essential function of preventing microorganism growth in the rinse aid composition.
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 pyrithione preservative system maintains antimicrobial efficacy in the diluted rinse aid solution, offering improved safety and sustainability by eliminating the need for PPE and providing effective preservation performance comparable to or exceeding conventional preservatives.
Implementation Method 1
The preservative is included in the formulation to prevent growth of microorganisms in the intermediate dispenser sump solution
Implementation Method 2
nonionic surfactants, and additional functional ingredients
Data Source
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AI summary
Solid rinse aid compositions and methods of making and using the same are disclosed. Solid rinse aid compositions include in a single concentrate composition a pyrithione preservative system to replace conventional preservatives in the isothiazolinone family, such as chloromethylisothiazolinone. Beneficially, the pyrithione preservative systems eliminate the need for any personal protective equipment to handle the solid rinse aid compositions. Methods of making and use using the rinse aids are also disclosed.