Curable Composition Plasticizer Blend for Sealants
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Solution Overview
Problem
Curable compositions containing phthalic acid ester plasticizers have insufficient depth curability and may cause curing retardation after storage, while those with terephthalic acid ester or isophthalic acid ester plasticizers may result in a thinned or weak cured product with inadequate tensile properties.
Innovation Solution
Incorporating a compound with a methyl ester group into a curable composition comprising a polyoxyalkylene polymer with a reactive silyl group and at least one ester compound selected from isophthalic acid ester, terephthalic acid ester, 1,3-cyclohexanedicarboxylic acid ester, or 1,4-cyclohexanedicarboxylic acid ester compounds to enhance depth curability, prevent curing retardation, and improve tensile properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a phthalic acid ester plasticizer is used to improve workability and adjust mechanical properties, then the curable composition has good processability, but depth curability is insufficient and curing retardation occurs after storage
Solution Approach 1:
The patent changes the chemical parameters of the plasticizer by using terephthalic acid ester or isophthalic acid ester instead of phthalic acid ester. This parameter change maintains good workability while improving depth curability and eliminating curing retardation after storage, thus resolving the technical contradiction.
Solution Approach 2:
The patent uses a composite plasticizer system combining terephthalic acid ester/isophthalic acid ester with other ester compounds (cyclohexanedicarboxylic acid esters, adipic acid esters, etc.). This composite approach achieves both good workability and excellent depth curability without curing retardation, resolving the contradiction between ease of operation and reliability.
2Object-affected harmful factors
If a terephthalic acid ester plasticizer is used to substitute phthalic acid ester, then environmental concerns are reduced, but depth curability remains insufficient and curing retardation occurs
Solution Approach 1:
The patent employs a composite plasticizer formulation that combines terephthalic acid ester or isophthalic acid ester (which reduce endocrine-disrupting effects) with other ester compounds including cyclohexanedicarboxylic acid esters and adipic acid esters. This composite system maintains environmental safety while achieving sufficient depth curability and eliminating curing retardation.
Solution Approach 2:
The patent modifies the chemical composition parameters by selecting specific ester compounds with appropriate molecular structures and properties. The combination of different ester types changes the overall chemical parameters of the plasticizer system, achieving both environmental safety and curing performance.
3Ease of operation
If a methyl ester plasticizer such as dimethyl adipate is used, then workability is improved, but the cured product becomes thinned and tensile properties are insufficient
Solution Approach 1:
The patent changes the molecular weight and chemical structure parameters of the plasticizer by using a blend of ester compounds rather than solely low molecular weight methyl esters. This parameter change maintains good workability while preventing excessive thinning of the cured product and improving tensile properties through optimal plasticizer composition.
Solution Approach 2:
The patent uses a composite plasticizer system that includes cyclohexanedicarboxylic acid esters, adipic acid esters, and other ester compounds in specific ratios. This composite approach balances workability improvement with maintenance of cured product strength and tensile properties, avoiding the thinning effect of single-component methyl ester plasticizers.
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 curable composition exhibits improved depth curability, reduced curing retardation, and enhanced tensile properties, making it suitable for applications as a sealant or adhesive.
Implementation Method 1
A polyoxyalkylene polymer having a reactive silyl group is a polymer capable of reacting with water in the air at room temperature to be cured into a rubbery form
Data Source
AI summary
The present invention provides a curable composition comprising an organic polymer having a reactive silyl group that is applicable to a sealant and an adhesive by improving depth curability, curing retardation after storage, and tensile properties. A curable composition comprising (A) an organic polymer having a reactive silyl group; (B) at least one ester compound (except for compounds having a methyl ester group) selected from the group consisting of isophthalic acid ester compounds, terephthalic acid ester compounds, 1,3-cyclohexanedicarboxylic acid ester compounds, and 1,4-cyclohexanedicarboxylic acid ester compounds; and (C) a compound having a methyl ester group.