Curable Fluorocopolymer Coatings for Industrial Solvents
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Solution Overview
Problem
The use of fluoropolymers in coatings is hindered by their poor solubility in industrial solvents, leading to economic and environmental issues due to the need for exotic solvents, and existing polymerization methods for tetrafluoropropene copolymers have limitations and undesirable properties.
Innovation Solution
A curable fluorocopolymer is formed through solution copolymerization using 40-60 mol% tetrafluoropropene, 5-45% vinyl ether or vinyl ester, and 3-30% hydroxyalkyl vinyl ether, allowing for the use of environmentally friendly solvents like xylene and butyl acetate, and employing HFO-1234yf and HFO-1234ze as monomers, resulting in a product with improved properties for coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluoropolymers are used in coatings, then excellent thermal, chemical, and weather resistance is achieved, but poor solubility in industrial solvents requires exotic solvents which increases cost and environmental issues
Solution Approach 1:
The patent creates a composite polymer system by copolymerizing tetrafluoropropene with vinyl ether or vinyl ester monomers. This composite approach combines the chemical resistance of fluoropolymer segments with the solubility and processability of vinyl ether/ester segments, enabling the coating to achieve both excellent chemical resistance and good solubility in industrial solvents without requiring exotic solvents
Solution Approach 2:
The copolymer structure provides local quality differentiation where fluorinated segments provide chemical resistance while vinyl ether/ester segments provide solubility. This localized functional distribution within the polymer chain allows different regions of the material to fulfill different requirements simultaneously
2Ease of manufacture
If exotic solvents are used to dissolve fluoropolymers, then solubility is improved, but economic cost and environmental toxicity increase
Solution Approach 1:
The patent changes the chemical structure parameters of the polymer by introducing vinyl ether or vinyl ester comonomers with specific functional groups. This structural modification fundamentally changes the solubility parameters of the polymer, enabling it to dissolve in common industrial solvents like xylene and butyl acetate rather than requiring exotic solvents, thereby reducing environmental toxicity and cost
3Productivity
If existing polymerization methods are used for tetrafluoropropene copolymers, then polymer production is achieved, but undesirable properties and limitations are produced
Solution Approach 1:
The patent optimizes polymerization parameters including monomer ratios (40-60 mol% tetrafluoropropene, 5-45% vinyl ether/vinyl ester, 3-30 mol% hydroxyalkyl vinyl ether), temperature ranges (-78°C to 100°C), and catalyst selection. These parameter changes produce copolymers with controlled molecular weight, glass transition temperature, and curability that overcome the limitations of existing polymerization methods
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 enables the production of coatings with superior performance using economical and environmentally friendly solvents, offering improved weatherability, chemical resistance, and operational feasibility, suitable for various substrates including metals, glass, and plastics.
Implementation Method 1
a curable fluorocopolymer can be formed by solution copolymerization of the monomers represented by (a), (b) and (c)
Data Source
AI summary
The present invention is directed to partially fluorinated copolymers and the production thereof. More specifically, the copolymers, which are preferably produced by a solution polymerization process, preferably have at least three units, the first unit selected from 2,3,3,3-tetrafluoropropene and 1,3,3,3-tetrafluoropropene, the second unit having a polymerized monomer selected from the vinyl esters and vinyl ethers, and the third unit having a polymerized monomer derived from a hydroxyl group-containing vinyl ether. The resulting copolymer is environmentally friendly, has favorable molecular weight characteristics, and may be shipped economically in high concentration.