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Graphene modified water-based acrylic resin paint with crosslinking agent
2017-7-3 23:23:53
Graphene modified water-based acrylic resin paint with crosslinking agent
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Aiming at the universality of Cl - in the modern industry and the seriousness of the harm, with graphene (Gr) modified water-borne acrylic resin coating system, using the orthogonal experiment with electrochemical test system screening paint a better formula, through a volatile organic compounds (TVOC) and formaldehyde (experiment), Fourier infrared spectrometer (FTIR), thermogravimetric analysis (TGA), respectively, to test the environmental performance of the coating, resistant to chemicals used in the performance, coating layer functional and stable performance, thermal performance.
The results showed that when the mass fraction of 0.10% Gr, acrylic resin and the crosslinking agent quality than 5:1, the acrylic resin mass fraction 50.00%, ZnO and Zn3 (PO4) 2 mass ratio 1:1 and the total mass fraction of 7.5% when coating has good mechanical performance, coating properties such as wear resistance and hardness could be improved by more than 1.5 times; The release amount of TVOC and HCHO is much lower than the national standard. The addition of Gr makes acrylic resin coating resistant to chemical solvability, thermal stability and functional stability.
Graphene (Gr) is the thinnest but most powerful nanometer material in the world, with excellent heat resistance and excellent transmission. However, graphene has been used as conductive material in microelectronics since it was discovered, and few reports have been applied in the field of corrosion prevention.
When evaluating coating anticorrosion performance and coating failure degree can use its capacitance value increase or lower resistance value measure, the combination of graphene by van der Waals force between the molecules lead to resistance value increases, this in order to improve the corrosion resistance of coating provides a theoretical basis.
Modern coatings, acrylic resin (AR) coating is environmentally friendly, and has high transparency, light plump, coating tenacity, as well as good corrosion resistance, but its total amount less than a quarter of global industrial coatings, development foreground huge.
In addition, AR coating has disadvantages such as low hardness, poor solvent resistance and poor heat resistance, which restrict its further development. There have been many studies on inorganic and organic modified AR, but the results show that the methods of Gr and its derivatives modified AR are feasible.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
In order to make the modification effect is more significant, this work by adding a new modifier graphene derivatives and new crosslinking agent high etherification melamine formaldehyde resin (EMF), of coating with traditional modifying agent (such as nano SiO2, organic silicon, pentaerythritol, polyurethane, etc.) what modified AR coating does not have high mechanical strength, excellent environmental performance, high heat strength and other characteristics, is the application of Gr and AR modification combining new attempt of high performance environmental protection coating, has better practical significance and good development prospects.
Methyl methacrylate (mma), butyl acrylate, benzoyl peroxide refined, according to the quality than 20:24:1 mixture, then the mixture is mixed with acrylic acid by volume than 6:1 in four flask, drop and n-butyl alcohol stirring, heating reaction 3 h after cooling and vacuum distillation, diluted with triethylamine adjust pH value to 7 or so, get AR stirring.
The mole ratio of 8:1 melamine formaldehyde aqueous solution and join the three flask, began to stir in the water bath pot, heat and reaction 3.5 h, there are white crystalline solid matter, stir in methanol solution, reaction to dissolve material after discharging the EMF.
The mass fraction of 3% or so of potassium permanganate solution, the Gr (purity > 99%, the thickness of 0.55 ~ 3.74 nm), sulfuric acid, potassium permanganate by the ratio of 1 g, 100 mL, 100 mL mixed evenly placed in a beaker and ultrasonic, then stir in the water bath heating, the suction filter out get modified Gr Gr washing to neutral and dry.
Adopt the method of blending preparation of water-borne acrylic coating: first the rheological additives are added to the deionized water mixing, and then in turn stir in dispersing agent, defoamer, cosolvent 20 min, put in modified Gr, red iron oxide, zinc phosphate [Zn3 (PO4) 2], zinc oxide (ZnO), titanium dioxide, barium sulfate, silica, talcum powder scattered 20 min, and add the EMF and disperse the defoaming agent 5 min and add AR, flow ping agent, pH regulator, emulsifier, and active diluent, film forming additive, with 200 mesh sieve filtration, namely waterborne anti-corrosion coatings.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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