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Preparation method of water-based weather-proof polyvinylidene fluoride compound coating

A technology of polyvinylidene fluoride and composites, which is applied in the direction of coating, etc., can solve the problems of weak bonding force of substrates and environmental pollution by organic solvents, and achieve excellent UV resistance, simple and easy process, and easy large-scale production Effect

Active Publication Date: 2020-06-05
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problems that the current PVDF resin is difficult to form a film at low temperature, has weak binding force with the base material, and pollutes the environment with organic solvents. Compatible with PVDF, the other kind is not) to swell it, through free radical copolymerization and make PVDF completely covered by multi-acrylic ester copolymer, and finally realize the normal temperature film formation of composite latex, so as to obtain excellent adhesion and weather resistance method of water-based coating

Method used

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  • Preparation method of water-based weather-proof polyvinylidene fluoride compound coating
  • Preparation method of water-based weather-proof polyvinylidene fluoride compound coating
  • Preparation method of water-based weather-proof polyvinylidene fluoride compound coating

Examples

Experimental program
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Effect test

Embodiment 1

[0030] (1) Preparation of PVDF / polyacrylate composite latex

[0031] Mix 1g PVDF and 30g deionized water and sonicate for 0.5 hours, then add 1.5g MMA and 2.5g HEA under nitrogen protection and set the stirring speed at 300r / min, swell at 25°C for 0.5 hours, then raise the temperature of the system to 70°C, After the temperature reached, 0.024 g of initiator potassium persulfate was added and reacted for 3 hours to obtain a uniform and stable PVDF / polyacrylate composite latex.

[0032] The particle size distribution of the composite latex particles was measured by the dynamic light scattering method, and the particle size distribution histogram of the composite particles was obtained as shown in figure 1 . Depend on figure 1 It can be seen that the average particle diameter (APD) of the composite particles is 293.9nm, and the particle size distribution index (PDI) is 0.047, indicating that the particle size distribution of the composite particles is very uniform.

[0033] T...

Embodiment 2

[0037] (1) Preparation of PVDF / polyacrylate composite latex

[0038] Mix 1g PVDF and 35g deionized water and sonicate for 1 hour, then add 1g EMA, 1g 2-EHA, 0.5g GMA, 0.5g EA under nitrogen protection and set the stirring speed at 250r / min, and swell at 25°C for 2 hours , and then the system was heated up to 75°C. After the temperature reached, 0.021 g of ammonium persulfate was added and reacted for 3 hours to obtain a uniform and stable PVDF / polyacrylate composite latex.

[0039] The particle size distribution of the composite latex particles was measured by the dynamic light scattering method, and the particle size distribution histogram of the composite particles was obtained as shown in image 3 . Depend on image 3 It can be seen that the APD of the composite particles is 329.1nm, and the PDI is 0.038, indicating that the particle size distribution of the composite particles is very uniform.

[0040] (2) Preparation of water-based PVDF / polyacrylate composite coating ...

Embodiment example 3

[0044] In the implementation case 3, the potassium persulfate initiator in the implementation case 1 is replaced with the potassium persulfate-sodium bisulfite initiator, and all the other operations are the same as the implementation case 1.

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Abstract

The invention relates to a preparation method of a water-based weather-resistant polyvinylidene fluoride compound coating. The method comprises the following steps: (1) mixing PVDF and deionized water, and adding an acrylate comonomer to obtain PVDF / polyacrylate composite latex; and (2) coating a base material with the obtained latex, and drying at room temperature for 12-72 hours to obtain the water-based coating. An initiator is potassium persulfate, ammonium persulfate, potassium persulfate-sodium hydrogen sulfite or ammonium persulfate-sodium hydrogen sulfite. The base material is a glassplate, a tinplate, a steel plate, stone, wood, fiber or plastic. The method is simple and feasible in process, low in cost, safe, environment-friendly and easy for large-scale production.

Description

technical field [0001] The invention belongs to the field of water-based coatings, in particular to a method for preparing a water-based weather-resistant polyvinylidene fluoride composite coating. Background technique: [0002] Traditional solvent-based coatings contain a large amount of volatile organic compounds (VOC) during their manufacture and use, which has brought serious pollution to the environment and caused great damage to the human body. With the strengthening of people's awareness of environmental protection, it is imperative to develop low-VOC environment-friendly water-based coatings. Water-based fluorocarbon coatings have excellent properties such as super weather resistance and stain resistance, and have good market potential in water-based coatings. Polyvinylidene fluoride (PVDF) resin is such a fluororesin. Years of outdoor exposure data in Florida, USA proves that it has excellent heat resistance, UV resistance, stain resistance, weather resistance and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D4/06C09D4/02C09D7/20
CPCC09D4/06C09D7/20
Inventor 潘明旺姜元袁金凤张广林
Owner HEBEI UNIV OF TECH