Aqueous PVDF-HFP Dispersion for Air-Dried Architectural Coatings
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Solution Overview
Problem
Current architectural coatings based on poly(vinylidene difluoride) (PVDF) resin face environmental concerns due to the use of organic solvents and require high-temperature baking, limiting their application, and the copolymer P(VDF-HFP) can be improved further by forming a composite material with additional polymers to enhance properties.
Innovation Solution
An aqueous organic silicon fluoro-containing polymer dispersion is developed, comprising poly(vinylidene difluoride-hexafluoropropylene), an organic silicon emulsion, and an acrylate polymer, with specific ratios and processing steps to create a stable and efficient coating that can be air-dried, offering improved climate resistance, washability, and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PVDF resin is used for architectural coating, then climate resistance and anti-fouling properties are improved, but organic solvents must be used which violates environmentally friendly manufacturing practices
Solution Approach 1:
The patent changes the dispersion medium parameter from organic solvent to aqueous environment, enabling PVDF coating to be air-dried instead of requiring high-temperature baking, thus eliminating harmful organic solvent emissions while maintaining climate resistance
Solution Approach 2:
The patent creates a composite dispersion system combining PVDF polymer with aqueous organic silicon emulsion and acrylate polymer, achieving both environmental compatibility and enhanced mechanical properties while maintaining the protective functions of PVDF
2Reliability
If PVDF resin coating is used, then climate resistance is improved, but high-temperature baking is required rather than air-drying, limiting application fields
Solution Approach 1:
The patent changes the drying method parameter from high-temperature baking to air-drying by formulating an aqueous dispersion system, which expands application fields to include interior coatings and applications where heat sensitivity is a concern
3Adaptability or versatility
If copolymer P(VDF-HFP) is used instead of PVDF, then aqueous coating application is enabled, but the properties can be improved even further by forming composite material
Solution Approach 1:
The patent forms a composite material by combining P(VDF-HFP) copolymer with aqueous organic silicon emulsion and acrylate polymer, achieving both aqueous coating capability and enhanced mechanical properties including brightness, acid resistance, crack resistance, and washability
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 dispersion provides a coating with enhanced brightness, acid resistance, crack resistance, and washability, overcoming the limitations of traditional PVDF resin coatings by allowing air-drying and improving mechanical stability while maintaining excellent climate resistance.
Implementation Method 1
adding 0.06 to 0.1 parts by weight of an initiator and 4 wt % to 7 wt % of an acrylate monomer into the reactor
Implementation Method 2
0.3 to 0.9 parts by weight of an emulsifier
Implementation Method 3
heating the reaction to 60° C. to 70° C. to be maintained at 60° C. to 70° C. for 0.5 to 1 hour
Implementation Method 4
adding 0.1 to 0.2 parts by weight of a terminator, maintaining the temperature of the reactor for 1 to 2.5 hours
Data Source
AI summary
An aqueous organic silicon fluoro-containing polymer dispersion is provided. The dispersion includes 100 parts by weight of poly(vinylidene difluoride-hexafluoropropylene), 10 to 30 parts by weight of organic silicon emulsion, and acrylate polymer. The acrylate polymer and the sum of the poly(vinylidene difluoride-hexafluoropropylene) and the organic silicon emulsion have a weight ratio of 30:100 to 50:100.