Urethane Adhesive Composition for Thermal Stability and Workability
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Solution Overview
Problem
Existing urethane-based adhesive compositions for automobiles lack sufficient thermal stability during production, workability, stability during use, and physical properties of the cured product, failing to meet the increasingly high requirements for adhesiveness and durability.
Innovation Solution
A urethane-based adhesive composition comprising specific ratios of urethane prepolymer, carbon blacks A and B with defined dibutyl phthalate oil absorption numbers, calcium carbonate, a plasticizer, a modified aliphatic diisocyanate, and a catalyst, optimized to achieve excellent thermal stability, workability, and physical properties of the cured product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional urethane-based adhesive compositions are used, then basic adhesive function is provided, but thermal stability during production is insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the dibutyl phthalate oil absorption numbers of carbon blacks (30-40 ml/100g for Carbon Black A, 98-108 ml/100g for Carbon Black B) and their content ratios (a: 25-35 parts, b: 55-75 parts), along with optimizing calcium carbonate content (30-35 parts) and modified aliphatic diisocyanate content (9-13 parts) relative to urethane prepolymer, to achieve both thermal stability during production and reliable adhesive performance
Solution Approach 2:
The patent uses composite materials by combining two types of carbon blacks with different oil absorption characteristics (Carbon Black A with DBP 30-40 and Carbon Black B with DBP 98-108) in specific ratios, together with calcium carbonate and modified aliphatic diisocyanate, to create a synergistic formulation that simultaneously provides thermal stability and adhesive reliability
2Ease of operation
If conventional urethane-based adhesive compositions are used, then adhesive function is provided, but workability during use is insufficient
Solution Approach 1:
The patent optimizes workability by controlling the oil absorption parameters of carbon blacks and adjusting their content ratios, along with calcium carbonate (30-35 parts) and modified aliphatic diisocyanate (9-13 parts), to achieve appropriate viscosity and flow characteristics while maintaining stability during use
3Duration of action of stationary object
If conventional urethane-based adhesive compositions are used, then basic adhesive properties are provided, but physical properties of cured product after aging are insufficient
Solution Approach 1:
The patent enhances long-term durability and shear strength retention after aging by using a composite formulation of two carbon blacks with different oil absorption numbers (Carbon Black A: DBP 30-40, Carbon Black B: DBP 98-108) in specific ratios (a: 25-35 parts, b: 55-75 parts), combined with calcium carbonate and modified aliphatic diisocyanate, creating a synergistic effect that maintains physical properties after aging
4Strength
If conventional urethane-based adhesive compositions are used, then adhesive function is provided, but adhesiveness is insufficient
Solution Approach 1:
The patent enhances adhesiveness by precisely controlling the oil absorption parameters of carbon blacks and their content ratios (a: 25-35 parts, b: 55-75 parts), along with calcium carbonate (30-35 parts) and modified aliphatic diisocyanate (9-13 parts), achieving superior adhesive performance through optimized formulation parameters
Solution Approach 2:
The patent improves adhesiveness by combining two carbon blacks with different oil absorption characteristics (Carbon Black A: DBP 30-40, Carbon Black B: DBP 98-108) in specific ratios with calcium carbonate and modified aliphatic diisocyanate, creating a composite formulation that delivers enhanced adhesive strength
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 exhibits enhanced thermal stability during production, improved workability, and superior physical properties of the cured product, including adhesiveness, shear strength retention, and low exothermicity, meeting the stringent requirements for automotive applications.
Implementation Method 1
a modified product E of an aliphatic diisocyanate
Implementation Method 2
a carbon black A having a dibutyl phthalate oil absorption number of 30 to 40 ml/100 g; a carbon black B having a dibutyl phthalate oil absorption number of 98 to 108 ml/100 g
Data Source
AI summary
A urethane-based adhesive composition includes a urethane prepolymer, a carbon black A having a dibutyl phthalate oil absorption number of 30 to 40 ml/100 g, a carbon black B having a dibutyl phthalate oil absorption number of 98 to 108 ml/100 g, a calcium carbonate C, a plasticizer D, a modified product E of an aliphatic diisocyanate, and a catalyst, and the urethane-based adhesive composition is configured to satisfy all of the following (1) to (6): (1) 25≤a≤35, (2) 55≤b≤75, (3) 197≤a+3b≤251, (4) 30≤c≤35, (5) 35≤d≤45, and (6) 9≤e≤13.