Marine Hose Polyurethane Composition for MOCA-Free Room-Temperature Curing
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Solution Overview
Problem
The polyurethane composition without MOCA faces challenges in achieving performance metrics such as working life, curability, blister resistance, hardness, abrasion resistance, and water resistance that are equivalent to or higher than those achieved with MOCA.
Innovation Solution
A polyurethane composition is developed that includes a urethane prepolymer formed from a polyether polyol and tolylene diisocyanate, a curing agent containing trimethylene-bis(4-aminobenzoate) and/or 2-methylpropyl 3,5-diamino-4-chlorobenzoate, and adipic acid as a catalyst, with specific mole ratios and content ranges to enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MOCA is used as a curing agent, then curability and physical properties are excellent, but environmental health is compromised
Solution Approach 1:
The patent extracts and removes the harmful MOCA curing agent from the polyurethane composition while maintaining the desired curability and physical properties through alternative curing agents and optimized formulation, thereby eliminating environmental health risks associated with MOCA
Solution Approach 2:
The patent changes the chemical parameters by substituting MOCA with alternative curing agents and optimizing the mole ratio of isocyanate groups to amino groups within 0.90-2.00, along with specific content ranges of curing agents, to achieve equivalent or superior performance without environmental harm
2Object-affected harmful factors
If MOCA-free polyurethane composition is used, then environmental health is improved, but working life and curability are insufficient
Solution Approach 1:
The patent optimizes critical parameters including the mole ratio of isocyanate groups to amino groups (0.90-2.00), curing agent content (95-100 mol% of total curing agent), and introduces adipic acid catalyst to achieve sufficient working life and curability in MOCA-free composition
Solution Approach 2:
The patent introduces adipic acid as a catalyst to mediate and accelerate the curing reaction of the alternative curing agents, enabling the MOCA-free composition to achieve curability and working life equivalent to MOCA-based systems
3Object-affected harmful factors
If MOCA-free polyurethane composition is used, then environmental health is improved, but hardness and abrasion resistance are insufficient
Solution Approach 1:
The patent optimizes the mole ratio of isocyanate groups to amino groups within 0.90-2.00 and specifies curing agent content ranges to achieve adequate hardness and abrasion resistance in the cured polyurethane product without using MOCA
4Object-affected harmful factors
If MOCA-free polyurethane composition is used, then environmental health is improved, but blister resistance is insufficient
Solution Approach 1:
The patent optimizes the chemical composition parameters including the mole ratio of isocyanate groups to amino groups (0.90-2.00) and curing agent content to prevent blister formation and ensure reliable performance in the cured polyurethane product
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 polyurethane composition exhibits excellent working life, curability, blister resistance, hardness, abrasion resistance, and water resistance, effectively addressing the limitations of MOCA-free compositions.
Implementation Method 1
adipic acid that acts as a catalyst
Implementation Method 2
a urethane prepolymer that is formed from a polyether polyol and tolylene diisocyanate and includes isocyanate groups; a curing agent that contains trimethylene-bis(4-aminobenzoate) and/or 2-methylpropyl 3,5-diamino-4-chlorobenzoate
Data Source
AI summary
An object of the present invention is to provide: a polyurethane composition that is excellent in working life, curability under room temperature conditions and in an open system, blister resistance, hardness after curing, abrasion resistance, and water resistance; and a marine hose. The present invention is a room-temperature curable polyurethane composition including a urethane prepolymer that is formed from a polyether polyol and tolylene diisocyanate and includes isocyanate groups, a curing agent that contains trimethylene-bis(4-aminobenzoate) and/or 2-methylpropyl 3,5-diamino-4-chlorobenzoate, and adipic acid that acts as a catalyst, in which a mole ratio of the isocyanate groups included in the urethane prepolymer to amino groups included in the curing agent is within a range from 0.90 to 2.00, and a content of trimethylene-bis(4-aminobenzoate) and/or 2-methylpropyl 3,5-diamino-4-chlorobenzoate is within a range from 95 to 100 mol % in a total amount of the curing agent; and the present invention is a marine hose formed by using the same.