Polyurea Formulation Viscosity and Mechanical Properties
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Solution Overview
Problem
Existing polyurea preparations often result in polymers with impaired mechanical properties due to unsaturations and high viscosity, leading to reduced molecular weight and increased production costs.
Innovation Solution
A polyurea formulation comprising a component A with a mixture of polyetheramines of varying equivalent weights, prepared using specific catalysts, and a component B prepolymer, which reduces viscosity and enhances mechanical properties by minimizing unsaturations and catalyst usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional polyurea preparations are used, then production costs are reduced, but mechanical properties are impaired due to unsaturations and high viscosity
Solution Approach 1:
The patent changes the chemical parameters by using polyetherpolyols with specific equivalent weights (50-500) and controlling the amination reaction conditions to minimize unsaturations. This results in polyureas with improved mechanical properties while maintaining cost-effectiveness through efficient catalyst usage.
Solution Approach 2:
The patent employs cost-effective catalysts and reagents that can be efficiently managed in the reaction process. By using appropriate catalysts and controlling reaction conditions, the patent achieves high-quality polyureas without requiring expensive materials, thus resolving the contradiction between mechanical properties and production costs.
2Strength
If polyetherpolyols with high equivalent weight are used, then viscosity is reduced, but unsaturations increase leading to impaired mechanical properties
Solution Approach 1:
The patent specifies using polyetherpolyols with equivalent weights between 50-500, which optimizes the balance between viscosity and unsaturation levels. This parameter control ensures that the polyurea achieves good mechanical properties without excessive unsaturations that would degrade performance.
3Productivity
If spray formulation is used, then productivity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent formulates the polyurea with optimized viscosity and composition parameters that are specifically suitable for spray application. By adjusting the equivalent weight of polyetherpolyols and controlling the reaction parameters, the patent creates a formulation that achieves high productivity while maintaining the necessary precision for quality polyurea production.
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 solution results in polyurea elastomers with improved mechanical properties, such as abrasion resistance, tensile strength, and elongation at break, while being cost-effective and producible as a spray formulation.
Implementation Method 1
a1) 5 to 40% by weight of at least one polyetheramine (PEA 1), obtainable from at least one polyetherpolyol (PEP 1) and at least one amine (1)
Implementation Method 2
b) a prepolymer, which is obtainable from b1) at least one polyetherpolyol (PEP 3) and b2) at least one isocyanate
Implementation Method 3
The invention relates to polyureas which can be prepared by reacting a component A with a component B
Data Source
AI summary
The invention relates to a polyurea preparable froma) a component A comprisinga1) 5 to 40% by weight of at least one polyetheramine 1 (PEA 1), obtainable from at least one polyetherpolyol 1 (PEP 1) and at least one amine 1, where PEP 1 has an equivalent weight of ≦500,a2) 30 to 90% by weight of at least one polyetheramine 2 (PEA 2), obtainable from at least one polyetherpolyol 2 (PEP 2) and at least one amine 2, where PEP 2 has an equivalent weight of >500,a3) 5 to 30% by weight of at least one amine chain extenderandb) a component B, which is a prepolymer, obtainable fromb1) at least one polyetherpolyol (PEP 3) andb2) at least one isocyanate.