Anticorrosive Pigment Composition for Water-Based Coatings
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a need for an anticorrosive pigment composition free from harmful heavy metals and zinc that does not compromise the storage stability of water-based paints while maintaining sufficient anticorrosive performance, as zinc-based pigments are ecologically concerning and aluminum dihydrogen tripolyphosphate can affect storage stability in water-based formulations.
Innovation Solution
A composition comprising aluminum dihydrogen tripolyphosphate reacted with calcium hydroxide and magnesium oxide at specific weight ratios, which enhances storage stability and anticorrosive performance when incorporated into water-based paints, and a process for producing this pigment by reacting the components in water at controlled temperatures and durations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If aluminum dihydrogen tripolyphosphate is used as an anticorrosive pigment free from heavy metals and zinc, then ecological safety is improved, but storage stability of water-based paint deteriorates
Solution Approach 1:
The patent applies parameter changes by reacting aluminum dihydrogen tripolyphosphate with calcium hydroxide and magnesium oxide to transform it into a new compound with modified chemical properties. This reaction changes the pH and chemical reactivity parameters, allowing the pigment to maintain anticorrosive effectiveness while eliminating the adverse effect on storage stability caused by the solid acid nature of the original compound.
Solution Approach 2:
The patent creates a composite anticorrosive pigment by combining aluminum dihydrogen tripolyphosphate with calcium hydroxide and magnesium oxide in specific weight ratios. This composite material integrates the ecological benefits of being free from heavy metals and zinc with the stability properties of calcium and magnesium compounds, resolving the contradiction between ecological safety and storage stability.
2Reliability
If zinc phosphate and zinc oxide are used as anticorrosive pigments, then anticorrosive performance is improved, but ecological safety deteriorates
Solution Approach 1:
The patent applies the extraction principle by removing zinc and other harmful heavy metals from the anticorrosive pigment composition. It extracts only the necessary anticorrosive functionality and replaces it with aluminum dihydrogen tripolyphosphate combined with calcium hydroxide and magnesium oxide, thereby eliminating ecological harm while maintaining protective performance.
Solution Approach 2:
The patent changes the chemical composition parameters by substituting zinc-based compounds with a zinc-free aluminum phosphate system. Through controlled reaction with calcium hydroxide and magnesium oxide, it achieves the same anticorrosive effect without the ecological toxicity associated with zinc, thus resolving the contradiction between performance and ecological safety.
3Stability of the object's composition
If aluminum dihydrogen tripolyphosphate is treated with ammonia to replace protons, then storage stability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges multiple functions into a single process by simultaneously reacting aluminum dihydrogen tripolyphosphate with both calcium hydroxide and magnesium oxide. This combined approach achieves proton replacement and storage stability improvement without requiring separate ammonia treatment steps, thereby reducing manufacturing complexity while maintaining the stability benefits.
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 resulting pigment composition maintains high anticorrosive performance equivalent to zinc phosphate types without deteriorating storage stability in water-based paints, ensuring environmental friendliness and stability over time.
Implementation Method 1
reacting said phosphate (a) with said calcium hydroxide (b) and said magnesium oxide (c) in water at a weight ratio (b)/(a) from greater than 0.2 to less than 1.0 and a weight ratio (c)/(a) from 0.05 to 0.3 at a temperature between 50°C and 100°C for a period of time at least 30 minutes
Data Source
AI summary
An anticorrosive pigment composition containing neither any heavy metal harmful to the environment nor zinc, which may be harmful to the environment. The composition is a product of the reaction of (a) aluminum dihydrogen tripolyphosphate, (b) a calcium compound selected among oxides, hydroxides, and carbonates, and (c) a magnesium compound selected among oxides, hydroxides, and carbonates. The composition exerts no adverse influence on the storage stability of water-based anticorrosive coating materials.