Water-Based Ink Vehicle Preparation And Properties Of Rosin-Based Alkyd-Acrylate Emulsion

Water-based inks replace organic solvents with water,reducing the content of volatile organic compounds（VOCs）,which can effectively reduce air pollution and construction hazards.Alkyd resins,as cheap raw materials,have excellent film performance,which can be used as ink binders.Traditional alkyd resins are mostly dissolved in organic solvents during use,which will release a large amount of VOCs and pose a huge threat to the environment.Therefore,research on water-based alkyd resins has been carried out,but the current water-based alkyd resins still have the defects of slow drying,poor adhesion,weather resistance and water resistance.In this paper,a rosin-based alkyd-acrylate emulsion with good stability and good adhesion was prepared by using linoleic acid,acrylic rosin and acrylate as raw materials.The specific work is as follows:（1）Under the environment of N₂,acrylic rosin-based alkyd resin was prepared with trimethylolpropane,fatty acid,acrylic rosin,phthalic anhydride,isophthalic acid and maleic anhydride as raw materials under the action of catalyst.The effects of the type of fatty acid,maleic anhydride dosage,the oil degree,catalyst type and dosage,reaction temperature and other factors on the appearance and reaction time of the resin were investigated.The results show that:when linoleic acid:soybean oil acid=1:2,the amount of maleic anhydride is 5%,the oil degree is 50%,the amount of catalyst butyl stannic acid is 1.0%,and the reaction temperature is 200～220℃,the alkyd resin with lighter color,glossy and short reaction time.The results of Fourier Transform Infrared Spectrometer（FT-IR）and Hydrogen Nuclear Magnetic Resonance（¹H NMR）showed that the propylene rosin-based alkyd resin was successfully prepared;the Thermal Gravimetric Analysis（TGA）results showed that the thermal decomposition temperature of the alkyd resin was 329.4°C,and the resin had good heat resistance.（2）The alkyd-acrylate emulsion was prepared,using the resin obtained under the above-mentioned optimum experimental conditions as raw material,Methyl Methacrylate（MMA）,Butyl Acrylate（BA）and Acrylic Acid（AA）as reaction monomers,Sodium Dodecyl Sulfate（SDS）and OP-10 as emulsifiers,Ammonium Persulfate（APS）as an initiator,and Na HCO₃ as a buffer solvent.The effects of monomer ratio,type and amount of emulsifier,type and amount of initiator,and reaction temperature on the stability of emulsion were investigated.Emulsion analysis by FT-IR,¹H NMR,potential particle size analyzer,etc.;and testing the properties of emulsion coating film by TGA,TEM,contact angle tester and universal material tester,etc.such as stability,microstructure,water resistance,tensile stress,adhesion and pencil hardness.The results show that when MMA/BA=20/20,When the dosage of emulsifier SDS/OP-10=1/3 is 0.02 mol/L,the dosage of initiator APS is 0.01 mol/L,the dosage of Na HCO₃ is 0.6%,the emulsification temperature is 80℃and the stirring speed is 300～400 rpm,the average particle size is 158.9nm and PDI is 0.165.It has low viscosity,good stability.The thermal stability temperature of the emulsion coating film is about 320°C,the hardness is H,and the adhesion Grade 1,with certain tensile strength and good water resistance.（3）Using alkyd-acrylate emulsion as a binder,water-based inks were prepared with different water-based colorants and various additives according to specific formulations,and researched on the ink stability,adhesion,water resistance,drying and so on.The results show that the ink has high water solubility,fast drying,stable storage of yellow and blue ink,but delamination of red ink;good adhesion and anti-blocking properties of the ink layer;but it has a large difference in water resistance.The yellow ink layer is seriously dyed in water and has poor water resistance,followed by red ink,and blue ink has good water resistance.The research condition is easy to create and the operation is simple.The obtained alkyd-acrylate emulsion has excellent performance and the VOCs content meets the emission standard which can be used as a binder in water-based inks.The research has great significance.