Two-Component Urethane Adhesive for Automobiles
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Solution Overview
Problem
Conventional two-component urethane-based adhesives for automobiles face challenges in maintaining consistent physical properties between cured products formed from the main agent alone and those formed from the mixture of main and curing agents, leading to difficulties in process management and performance satisfaction without an excessive curing agent.
Innovation Solution
A two-component urethane-based adhesive composition comprising an isocyanate group-terminated polyether polyol as the first component and a polyol compound with a curing catalyst in the second component, where the polyol compound contains multiple polyols with specific hydroxyl values and multifunctional polyols, allowing for a high curing rate and consistent physical properties without the need for a second curing agent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a two-component type urethane-based adhesive is used to accelerate curing, then the curing rate is improved, but the physical properties of the cured product change significantly compared to using the main agent alone
Solution Approach 1:
The invention changes the chemical parameters of the curing agent by selecting specific polyol compounds with controlled hydroxyl values (40-100 mgKOH/g) and specific functional group compositions (2-50% multifunctional polyol with 2.3-10 hydroxyl groups). These parameter adjustments enable the curing agent to accelerate curing while maintaining physical properties of the cured product within 20% of the main agent alone, thus resolving the contradiction between improved curing rate and maintained physical properties consistency.
2Productivity
If the amount of curing agent is increased to accelerate curing, then the curing rate is improved, but the physical properties of the cured product deteriorate
Solution Approach 1:
The invention optimizes the dosage parameter of the curing agent to 5-50 parts by mass per 100 parts of main agent. This parameter range achieves effective curing acceleration while limiting the impact on physical properties. The specific composition parameters of the polyol compound (hydroxyl value 40-100, multifunctional polyol content 2-50%) work synergistically with this dosage parameter to maintain cured product strength within acceptable limits despite the presence of the curing agent.
3Stability of the object's composition
If a low ratio of curing agent is used to maintain cured product structure, then the physical properties are maintained, but the curing acceleration effect is insufficient
Solution Approach 1:
The invention changes the chemical composition parameters of the curing agent to include specific polyol compounds with hydroxyl values of 40-100 mgKOH/g and containing 2-50% multifunctional polyol (2.3-10 hydroxyl groups, hydroxyl value 160-550 mgKOH/g). These compositional changes enhance the reactivity and curing acceleration capability of the curing agent, allowing it to achieve effective curing promotion even at low dosages of 5-50 parts per 100 parts of main agent, thus resolving the contradiction between maintaining cured product structure and achieving sufficient curing acceleration.
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 a high curing rate, short manufacturing time, and consistent physical properties, ensuring the adhesive meets automotive performance requirements without the second component, with minimal changes in properties between the main agent alone and the mixed product.
Implementation Method 1
a second component comprising a polyol compound and a curing catalyst
Data Source
AI summary
The present invention provides a two-component type urethane-based adhesive composition for an automobile, which has a good productivity because of high curing rate, which there is not much change between physical properties of a cured product formed from a first component alone and those of a cured product formed from a mixture of first and second components, and which it is possible to satisfy required performances for an automotive adhesive without the second component. The present invention relates to a two-component type urethane-based adhesive composition for an automobile comprising (1) a first component comprising an isocyanate group-terminated polyether polyol compound, and (2) a second component comprising a polyol compound and curing catalyst, wherein a cured product from the first component alone has an elastic modulus of 5 to 20 MPa and an elongation of 300 to 850%, and wherein a cured product from a mixture of the first and second components at a mixing ratio of the first component to the second component of 100/10 has an elastic modulus of 3 to 20 MPa and an elongation of 300 to 650%.