Carboxylic Acid Terpolymer for Hard Water Scale Control
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Solution Overview
Problem
Conventional alkaline detergents face challenges in hard water environments due to excessive water hardness, leading to scale deposition and reduced cleaning efficacy, and are often reliant on phosphorus-containing compounds that are environmentally and health-concerned, necessitating a phosphate-free alternative for effective scale control.
Innovation Solution
A detergent composition comprising at least 50 wt-% alkali metal hydroxide and a carboxylic acid terpolymer with specific monomer ratios and a K value of 15 to 30, which effectively controls hard water scaling without phosphates, suitable for various cleaning applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phosphates or NTA are used as sequestering agents in alkaline detergents, then scale control and cleaning efficacy are improved, but environmental and health concerns arise
Solution Approach 1:
The patent changes the chemical composition parameters by replacing phosphates and NTA with a specific carboxylic acid terpolymer containing acrylic acid, methacrylic acid, and itaconic acid in defined ratios. This polymer provides equivalent scale control functionality through different chemical mechanisms (carboxylic acid groups binding calcium and magnesium ions) while eliminating the environmental persistence and toxicity issues associated with phosphates and NTA
Solution Approach 2:
The invention uses a composite polymer structure combining three different monomers (acrylic acid, methacrylic acid, and itaconic acid) in specific proportions. This composite approach creates a synergistic effect where the combination of different carboxylic acid groups provides superior scale control compared to single polymers, while maintaining environmental compatibility
2Reliability
If chelating agents are added to counteract water hardness, then cleaning effectiveness is improved, but the water hardness may exceed the chelating capacity causing free calcium ions to cause precipitation
Solution Approach 1:
The patent modifies the chelating agent parameters by using a high-molecular-weight terpolymer with multiple carboxylic acid groups per molecule. This increases the chelating capacity to handle higher water hardness levels (up to 500 ppm calcium carbonate) without exceeding capacity. The polymer's structure allows it to bind multiple calcium and magnesium ions simultaneously, providing adaptability to varying hardness conditions
3Power
If conventional alkaline detergents are used in hard water, then cleaning power is maintained, but scale deposition occurs on surfaces
Solution Approach 1:
The terpolymer acts as an intermediary substance that mediates between the alkaline detergent and hard water minerals. It binds calcium and magnesium ions in the water, preventing them from reacting with the detergent components and depositing as scale on surfaces. The polymer serves as a bridge that captures hardness ions in solution, allowing the alkaline detergent to maintain its cleaning power without generating scale
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 provides effective scale control and improved cleaning performance in hard water conditions while being environmentally friendly by eliminating phosphate use, ensuring effective soil removal and preventing redeposition.
Implementation Method 1
a carboxylic acid terpolymer for water scale control
Implementation Method 2
Scaling is the precipitation of a salt from a solution that is supersaturated with respect to the salt
Data Source
AI summary
A highly alkaline detergent is described which includes the use of a carboxylic acid terpolymer in combination with an alkali metal hydroxide. The detergent maintains cleaning functions and also prevents hard water scaling at application temperatures, for example at temperatures of between about 145 - 180 degrees Fahrenheit and, for example, at a pH of 9.5 to about 13.