Silane-Cured Adhesive Composition for Low-Odor Alkali Resistance
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Solution Overview
Problem
Existing curable resin compositions used for adhesive agents, particularly those containing an organic polymer with a hydrolyzable silyl group, suffer from odor issues due to the use of amine-based curing agents and lack adequate workability, limiting their use in indoor environments.
Innovation Solution
A curable composition comprising specific amounts of an organic polymer with a hydrolyzable silyl group, process oil, silica sand, and a silane compound, which enhances adhesiveness and workability without using epoxy resin, thereby reducing odor and improving alkali resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an amine-based curing agent is used for epoxy resin, then the curable composition achieves good adhesiveness and workability, but it generates strong odor that limits indoor use
Solution Approach 1:
The invention extracts and removes the epoxy resin and amine-based curing agent from the composition entirely. Instead, it uses a silane-modified polymer that cures through moisture-induced hydrolysis and condensation reactions, eliminating the source of strong odors while maintaining adhesive performance and workability
Solution Approach 2:
The invention changes the chemical parameters of the curing mechanism from amine-epoxy reaction to moisture-cured silane crosslinking. This parameter change transforms the curing chemistry to one that occurs at room temperature without strong odors, while the silane modification maintains the necessary adhesive properties
2Reliability
If epoxy resin is used to impart alkali resistance, then the curable composition achieves good alkali resistance, but it requires addition of amine-based curing agent which causes odor
Solution Approach 1:
The invention removes both the epoxy resin and amine-based curing agent from the system. Alkali resistance is achieved through the silane-modified polymer's inherent chemical structure and moisture-cured crosslinking mechanism, which forms a dense, chemically resistant network without requiring epoxy chemistry
Solution Approach 2:
The invention creates a composite material system combining silane-modified polymer with inorganic fillers and process oils. This composite approach achieves alkali resistance through the synergistic combination of chemically resistant silane crosslinked matrix and inert inorganic components, eliminating the need for epoxy resin
3Reliability
If epoxy resin system is used, then the curable composition achieves good adhesiveness, but it requires multiple components (epoxy resin + curing agent) increasing complexity
Solution Approach 1:
The invention merges the adhesive polymer and curing agent into a single moisture-cured silane-modified polymer component. The silane groups are pre-introduced into the polymer structure, eliminating the need for separate epoxy resin and amine curing agent components, thereby simplifying the system to a single-component formulation that maintains strong adhesiveness
Solution Approach 2:
The silane-modified polymer serves multiple functions simultaneously: it acts as the adhesive matrix, contains the crosslinking functionality through silane groups, and cures through ambient moisture. This multi-functionality eliminates the need for separate curing agent component while maintaining adhesive performance
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 achieves good workability and excellent adhesiveness even after alkaline treatment, addressing odor issues and expanding the composition's usability to indoor applications.
Implementation Method 1
an organic polymer having a hydrolyzable silyl group
Implementation Method 2
a curable composition containing an organic polymer having a hydrolyzable silyl group
Implementation Method 3
3 parts by weight to 35 parts by weight of at least one type of process oil selected from the group consisting of paraffinic process oils, naphthenic process oils, and aromatic process oils
Implementation Method 4
20 parts by weight to 200 parts by weight of silica sand
Implementation Method 5
2 parts by weight to 10 parts by weight of a silane compound having an epoxy group and/or a silane compound having an amino group
Data Source
AI summary
The object is to provide, without use of an epoxy resin, a curable composition which has good workability and which has excellent adhesiveness even after an alkaline treatment. The object is attained by providing a curable composition containing: (A) 100 parts by weight of an organic polymer having a hydrolyzable silyl group; (B) 3 parts by weight to 35 parts by weight of at least one type of process oil selected from the group consisting of paraffinic process oils, naphthenic process oils, and aromatic process oils; (C) 20 parts by weight to 200 parts by weight of silica sand; and (D) 2 parts by weight to 10 parts by weight of a silane compound having an epoxy group and/or a silane compound having an amino group.