Calcium Hydroxide Nitrate Curing Accelerator for Stable Adhesives
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Solution Overview
Problem
Existing adhesive compositions using calcium nitrate tetrahydrate as a curing accelerator face issues with unpredictable reactivity in basic environments, hygroscopicity, and unreliable production, leading to undesired agglomeration and extended processing times.
Innovation Solution
The use of calcium hydroxide nitrate particles as a curing accelerator, which are produced through processes involving the reaction of calcium nitrate tetrahydrate and calcium hydroxide, provides enhanced curing speed and stability, avoiding uncontrolled reactions and hygroscopicity, allowing for shorter processing times and improved storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If calcium nitrate tetrahydrate is used as curing accelerator, then curing speed is enhanced, but reactivity becomes unpredictable and storage stability deteriorates due to hygroscopicity
Solution Approach 1:
The invention changes the chemical composition parameter by replacing calcium nitrate tetrahydrate with calcium hydroxide nitrate, which has different hygroscopic properties. This parameter change maintains the curing acceleration function while eliminating the storage stability problems associated with hygroscopicity and unpredictable reactivity
Solution Approach 2:
The invention uses a readily available starting material (calcium nitrate tetrahydrate) that is processed into a more stable derivative (calcium hydroxide nitrate). The process converts a material with short shelf life and unpredictable behavior into one with extended stability and reliable performance
2Productivity
If calcium nitrate tetrahydrate is used as curing accelerator, then curing speed is enhanced, but production reliability deteriorates due to uncontrolled reactions
Solution Approach 1:
The invention performs preliminary action by pre-reacting calcium nitrate tetrahydrate with calcium hydroxide to form calcium hydroxide nitrate before use as a curing accelerator. This preliminary reaction eliminates the unpredictable reactivity issues that would otherwise occur during the adhesive manufacturing process, ensuring consistent and reliable production
Solution Approach 2:
The invention introduces calcium hydroxide nitrate as an intermediary substance that mediates between the calcium nitrate tetrahydrate and the adhesive components. This intermediary prevents direct uncontrolled reactions while maintaining the desired curing acceleration effect
3Productivity
If calcium nitrate tetrahydrate is used as curing accelerator, then curing speed is enhanced, but processing time increases due to agglomeration
Solution Approach 1:
The invention changes the physical and chemical parameters of the curing accelerator by converting calcium nitrate tetrahydrate into calcium hydroxide nitrate. This parameter change prevents agglomeration during storage and handling, ensuring consistent dispersion and eliminating extended processing times associated with material instability
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 calcium hydroxide nitrate particles offer reliable production, improved curing speed, and stable storage, reducing processing times and maintaining shelf life of one-part and two-part adhesive compositions.
Implementation Method 1
reacting the calcium hydroxide particles with the nitrate solution
Implementation Method 2
evaporating the solvent water to form calcium hydroxide nitrate particles
Implementation Method 3
calcium nitrate tetrahydrate is molten in a basic (pH >7) environment
Data Source
AI summary
The present disclosure relates to a curable precursor of an adhesive composition, the curable precursor comprising a curable resin and a curing accelerator, wherein the curing accelerator comprises calcium hydroxide nitrate particles. The present disclosure further relates to processes for making calcium hydroxide nitrate particles as used for said curable precursor.