Urethane Adhesive Composition Talc Filler Stability
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Solution Overview
Problem
Two-part urethane adhesive compositions face challenges with storage stability and adhesive properties, particularly when using calcium carbonate as a filler, which can lead to poor performance without primer or sanding treatments.
Innovation Solution
The use of talc instead of or in combination with calcium carbonate, along with specific molecular weight polyols and polyisocyanates, enhances storage stability and adhesive properties without the need for primer or sanding treatments, by optimizing the composition of the first and second liquids in the adhesive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If calcium carbonate is used as a filler in the first liquid, then the adhesive composition can achieve good adhesive properties, but the storage stability of the first liquid deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the filler system by replacing calcium carbonate with talc, and adjusting the molecular weight parameters of polyols (using high-molecular-weight polyol with Mn≥1000 and low-molecular-weight polyol with Mn<1000) to resolve the contradiction between adhesive performance and storage stability
Solution Approach 2:
The patent creates a composite adhesive system combining talc filler with specific polyol-polyisocyanate combinations, where the composite effect of these materials achieves both good adhesive properties and storage stability that individual components cannot provide alone
2Reliability
If primer treatment or sanding treatment is applied to the resin material surface, then adhesive properties improve, but the number of production steps increases and production efficiency decreases
Solution Approach 1:
The patent extracts and eliminates the need for separate primer treatment or sanding treatment steps by incorporating surface treatment functionality directly into the adhesive composition itself, specifically through the talc-filled first liquid that provides both adhesion promotion and surface conditioning
Solution Approach 2:
The adhesive composition is designed to perform multiple functions simultaneously: the talc-filled first liquid acts as both the adhesive binder and a surface treatment agent that prepares the resin material surface for bonding, eliminating the need for separate treatment steps
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 urethane adhesive composition exhibits excellent adhesive properties and storage stability, maintaining performance without primer or sanding treatments, while reducing the content of calcium carbonate and incorporating talc to improve stability and viscosity.
Implementation Method 1
containing 10 parts by mass or more of zeolite based on 100 parts by mass of the polyisocyanate, the high-molecular-weight polyol (I), and the prepolymer in total
Implementation Method 2
a prepolymer obtained by reacting a polyisocyanate and a high-molecular-weight polyol (I) having a number average molecular weight of 1000 or more
Implementation Method 3
containing 20 parts by mass or more of talc, 0 to 40 parts by mass of calcium carbonate, and 10 parts by mass or more of zeolite based on 100 parts by mass of the polyisocyanate, the high-molecular-weight polyol (I), and the prepolymer in total
Data Source
AI summary
A urethane adhesive composition includes a first liquid and a second liquid, the first liquid containing a prepolymer obtained by reacting a polyisocyanate and a high-molecular-weight polyol (I), and at least one filler selected from talc and calcium carbonate, and containing 20 parts by mass or more of talc, 0 to 40 parts by mass of calcium carbonate, and 10 parts by mass or more of zeolite based on 100 parts by mass of the polyisocyanate, the high-molecular-weight polyol (I), and the prepolymer in total, the second liquid containing a high-molecular-weight polyol (II) and a low-molecular-weight polyol, the ratio of the number of moles of hydroxyl groups derived from the low-molecular-weight polyol to the total number of moles of hydroxyl groups derived from the high-molecular-weight polyol (I) and the high-molecular-weight polyol (II) being four or more.