Fluorinated Polymer Powder Coating Blocking Resistance Water Repellency
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Solution Overview
Problem
Powder coating materials with good blocking resistance have insufficient water repellency, and those with excellent water repellency often compromise on blocking resistance, making it challenging to achieve both properties simultaneously.
Innovation Solution
A powder coating material comprising a fluorinated polymer with specific units based on CF3—CH═CHF and CF3—CF═CH2, along with units from a monomer represented by the formula X1—Z1, where the content of these units is optimized to achieve excellent blocking resistance and water repellency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fluorinated polymer containing units based on chlorotrifluoroethylene is used, then blocking resistance is improved, but water repellency is insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the fluorinated polymer by incorporating specific units based on CF3-CH=CHF and CF3-CF=CH2 in controlled amounts (20-80 mol% and 5-30 mol% respectively), while maintaining units based on chlorotrifluoroethylene. This parameter optimization enables the coating film to achieve both good blocking resistance and excellent water repellency, resolving the contradiction between these two properties.
Solution Approach 2:
The patent creates a composite fluorinated polymer structure that combines multiple types of fluorinated units (CF3-CH=CHF, CF3-CF=CH2, and chlorotrifluoroethylene units) in specific proportions. This composite approach allows the material to simultaneously exhibit blocking resistance from the chlorotrifluoroethylene units and water repellency from the CF3-containing units, overcoming the limitations of single-component fluorinated polymers.
2Object-affected harmful factors
If the fluorinated polymer contains high amounts of CF3 units for water repellency, then water repellency is improved, but blocking resistance deteriorates
Solution Approach 1:
The patent optimizes the parameter balance by limiting CF3-CH=CHF units to 20-80 mol% and CF3-CF=CH2 units to 5-30 mol%, preventing excessive CF3 content that would harm blocking resistance. Simultaneously, these amounts are sufficient to provide excellent water repellency, thus resolving the contradiction by finding the optimal parameter range.
Data Source
AI summary
A powder coating material which has excellent blocking resistance and can form coating films excellent in water repellency is provided.The powder coating material of the present invention comprises a fluorinated polymer comprising from 20 to 80 mol % of units based on at least one species selected from the group consisting of CF3—CH═CHF and CF3—CF═CH2, from 18 to 60 mol % of units based on a monomer represented by the formula X1—Z1 (wherein X1 is a specific monovalent polymerizable group, and Z1 is a specific alkyl group, a specific cycloalkyl group or a specific aryl group) and units having a crosslinkable group.