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A kind of PVDF fluorocarbon powder coating and preparation method thereof
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A powder coating and fluorocarbon technology, applied in the direction of epoxy resin coating, coating, etc., can solve the problems of uneven mixing of PVDF resin and acrylic resin, uneven coating thickness, poor gloss and leveling, and achieve hardness Balanced with flexibility, good adhesion, and more anchoring groups
Active Publication Date: 2020-06-16
广东依斯特新材料有限公司
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[0006] The object of the present invention is to provide a kind of PVDF fluorocarbon powder coating and preparation method thereof, to solve the technical problems of PVDF fluorocarbon powder coating thickness non-uniformity, gloss and poor leveling property; In the traditional production process of powder coatings, PVDF resin is plasticized at high temperature for a long time during the melt extrusion process, resulting in increased molecular weight and uneven mixing of PVDF resin and acrylic resin.
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[0036] A kind of preparation method of synthesizing above-mentioned PVDF fluorocarbon powder coating, adopts melt mixing extrusion method, and its process step is:
[0037] Put the auxiliary solid resin and pigment into a high-speed mixer for high-speed dispersion mixing and frictional heat generation. The temperature of frictional heat generation is controlled at 50-70°C; 2) After mixing, add ultra-fine PVDF resin to the high-speed mixer to continue High-speed dispersion mixing and frictional heat generation, the temperature of frictional heat generation is controlled at 70-120°C; 3) The mixture obtained in step 2) is melted and extruded, cooled, dried, pressed into pellets, and the temperature of melted extrusion is The range is: 160-210°C. ; 4) Put the granulated pellets obtained in step 3) into the storage bin for spraying and freezing with liquid nitrogen, drenching and soaking to make them brittle, and the freezing temperature of liquid nitrogen is lower than or equal to...
Embodiment 1
[0039] The specific formula parameters are as follows:
[0040] 28 kg of titanium dioxide, the brand is DuPont R-960 in the United States; 25 kg of acrylic resin, 5 kg of alicyclic epoxy resin; 70 kg of PVDF resin (customized model); adhesion promoter of solid organic silicon phosphorus additives 1 kg and 0.2 kg of nano-modifier additives.
[0041] The concrete preparation steps of embodiment 1:
[0042] (1) Add all the titanium dioxide, acrylic resin, and cycloaliphatic epoxy resin into a high-speed mixer; carry out high-speed dispersion for 25 minutes, and the high-speed dispersion temperature is 65°C.
[0043] (2) After the above steps are completed, add all the PVDF resin (customized model) into the high-speed mixer; then disperse at high speed for 35 minutes, and the high-speed dispersion temperature is 85°C.
[0044] (3) The material mixture obtained in step (2) enters the extruder to be extruded into strips and cut into pellets with a diameter of 0.5-3mm, and the melt...
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Abstract
The invention discloses a PVDF fluorocarbon powder coating and a preparation method thereof. The PVDF fluorocarbon powder coating comprises the following materials: ultra-fine PVDF resin, auxiliary solid resin, a pigment and an auxiliary agent; the PVDF fluorocarbon powder coating is characterized in that the weight ratio of the ultra-fine PVDF resin to the auxiliary solid resin is 70:30, the auxiliary solid resin comprises acrylic resin and alicyclic epoxy resin, wherein the weight ratio of the acrylic resin to the alicyclic epoxy resin in the auxiliary solid resin is (5:25)-(25:5); and the preparation method comprises the following steps: (1) dispersing and mixing the auxiliary solid resin and the pigment at a high speed and performing rubbing to generate heat; (2) adding the ultra-finePVDF resin, performing high-speed dispersion and mixing continuously, and performing rubbing to generate heat; (3) performing melt extrusion, performing cooling, performing drying, and performing pressure-roller cutting; (4) spraying liquid nitrogen and performing freezing; (5) performing crushing, and in the crushing process, performing freezing by using liquid nitrogen; (6) classifying powder; (7) collecting qualified powder, adding an adhesion accelerator and a nano modifier auxiliary agent, and performing spheroidization and loosening treatment; and (8) screening powder which meets a standard. According to the technical scheme, a problem that the PVDF resin is plasticized is avoided, and therefore the PVDF resin and the acrylic resin are mixed uniformly.
Description
technical field [0001] The invention belongs to the field of paint industry, and in particular relates to a PVDF fluorocarbon powder paint and a preparation method thereof. Background technique [0002] PVDF fluorocarbon coatings have excellent weather resistance, chemical corrosion resistance and excellent mechanical properties. Almost all advanced metal buildings use fluorocarbon coatings. However, the currently dominant fluorocarbon coatings are solvent-based coatings, which need to disperse the formula raw materials in the solution, so it is inevitable to contain solvents in the raw materials, production process and use process, which will inevitably pollute the environment. With the increasing attention to environmental protection, the use of solvent-based fluorocarbon coatings is increasingly restricted due to its VOC emissions. [0003] Powder coatings have the advantages of energy saving, environmental protection, and no three-waste pollution. Therefore, the market ...
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