Cross-linked EPDM Latex Blend for Cold-Resistant Coatings
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Solution Overview
Problem
Current coatings lack improved brittleness resistance at cold temperatures, water barrier properties, acid and base resistance, and natural weather resistance without additional additives.
Innovation Solution
A high solids cross-linked ethylene propylene diene terpolymer latex is blended with non-cross-linked ethylene propylene diene terpolymer latex, acrylic, urethane, or epoxy, using a premixed liquid EPDM component with specific molecular weights and solvents, along with surfactants and curatives, to create a formulation that is 50% to 98% cross-linked, providing improved adhesion and moisture barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional coatings are used, then they provide basic protective functions, but they exhibit brittleness at cold temperatures and lack improved water barrier properties
Solution Approach 1:
The patent modifies the chemical composition parameters of the coating by incorporating cross-linked EPDM latex with specific molecular weights (5000-500000) and controlled cross-linking density (50-98%). This changes the physical properties of the coating, resulting in a glass transition temperature of -50°C to -40°C, which prevents brittleness at cold temperatures while improving impact resistance.
Solution Approach 2:
The patent creates a composite coating system by blending cross-linked EPDM latex with non-cross-linked EPDM latex and other polymers (acrylic, urethane, or epoxy). This composite approach combines the flexibility and cold-temperature performance of cross-linked EPDM with the adhesion and protective properties of complementary materials, achieving both improved impact resistance and cold-temperature ductility.
2Reliability
If conventional coatings are used, then they provide basic protection, but they lack enhanced water barrier properties and acid/base resistance
Solution Approach 1:
The patent changes the chemical structure parameters by implementing a cross-linking network in the EPDM latex with cross-linking densities of 50-98%. This cross-linked structure creates a more tightly bound polymer matrix that reduces water penetration and improves resistance to acids and bases, enhancing the coating's reliability as a protective barrier.
Solution Approach 2:
The patent forms a composite system combining cross-linked EPDM latex with other polymer materials (acrylic, urethane, or epoxy). This composite structure synergistically improves water barrier properties and chemical resistance, as the different polymer components work together to provide comprehensive protection against water penetration and chemical degradation.
3Reliability
If conventional coatings are used, then they provide basic weather protection, but they lack natural weather resistance without additional additives
Solution Approach 1:
The patent modifies the inherent properties of the EPDM latex by controlling the cross-linking degree (50-98%) and molecular weight distribution (5000-500000). This parameter optimization enables the coating to achieve natural weather resistance through the stabilized polymer structure itself, without requiring additional weathering additives or protective agents.
Solution Approach 2:
The cross-linked EPDM latex formulation is designed to be self-sufficient for weather protection. The cross-linked polymer network provides inherent stability against UV degradation, oxidation, and environmental weathering, eliminating the need for separate additives to achieve weather resistance. The coating serves its own protective function through its optimized molecular structure.
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 resulting formulation exhibits improved impact resistance, reduced brittleness, enhanced water barrier properties, and increased acid and base resistance, with a glass transition temperature of -50°C to -40°C, low VOC emissions, and ease of application, making it suitable for various applications including roofing and paints.
Implementation Method 1
providing improved adhesion and moisture barrier properties
Implementation Method 2
A high solids cross-linked ethylene propylene diene terpolymer latex is blended with non-cross-linked ethylene propylene diene terpolymer latex
Data Source
AI summary
Latex blend formulations that include a high solids cross-linked ethylene propylene diene terpolymer latex with acrylics, polyurethane, epoxy, or alkyd resin usable as a waterproofing material for roofs or usable in paints and adhesives.