The Research On Modification And Antistatic Property Of Raw Lacquer

Lacquer has shown remarkable potential for the remediation of environmental problems owing to its excellent corrosion resistance, weatherability, acid-proof, temperature resistance, atomic radiation, but there still are some inherent defects for unmodified natural lacquer like poor alkali resistance, low flexibility, higher costs, which limits the development and application of lacquer. Antistatic coating, a new functional materials conducting the electrostatic precipitation away from the device, has been widely used in the oil industry, electronics industry, textile industry and many other areas. Nowadays, a majority of antistatic coatings has used synthetic resins as film material, however, the raw material selection results in waste of energy and atmospheric pollution because of the volatile organic compounds (VOC) in the production process.In this study, lacquer was modified by tung oil, another dry vegetable oil,to obtained the new composite resin matrix, the doped antistatic coatings was blended with conventional carbon-based conductive filler like carbonblack and graphite and the emerging high-conductivity flexible sheet structural material like graphene respectively. The structure of of polymerization tung oil, lacquer liquid, raw film, tung oil-based lacquer film composite resin was analysised by infrared spectroscopy (FT-IR) the structural characterization. The morphology and heat resistance were characterized by Scanning electron microscopy (SEM) and simultaneous thermal analyzer (TG-DSC). The impact of polymerization tung oil, drying temperature was discussed, and the impact that type and amount of filler for electrical conductivity and mechanical properties was studied. The results are as follows:1. The polymerized tung oil showed no influence on the natural lacquer reverse microemulsion system. With the modification of tung oil, the mechanical properties of composite resins has enhanced, for instance, pencil hardness, flexibility and impact resistance, to improve 5H,2mm,50cm respectively, dry time reduced from 180min to 50min.2. For the aging lacquer with deactivational lacquer enzyme, the composite resin modified by tung oil could film by heating&drying especially at 140℃. While under the special environmental conditions, the composite resin film dried at room temperature showed outstanding medium-resistance:resistance to gasoline corrosion time 30h, boiling water resistant time 5d, resistant to hydrochloric acid (25%), sodium hydroxide (25%), sodium chloride (25%) etching time was 30d,30d,4d.3. When the additive volume of conventional carbon-based conductive filler was about 15%, the surface resistivity reached 1077Ω, while just 0.6% of the graphene-based composite antistatic mixed with 1.5% coupling agent could satisfied the same demands.4.With the test for the mechanical properties, graphene composite antistatic coating showed 0 level in adhesion, lmm in flexibility,50cm in impact resistance, which was better than unfilled composite resin coatings and add graphite, carbon black as filler composite coating. Simultaneously, the graphene coating showed perfect medium resistance and heat resistance of excellent high temperature after baking 24h at 180℃, the film was intact with no wrinkles, peeling and cracks. The adhesion decreased by 1 level and Surface resistance of the composite coatings declined slightly, but still meet the requirements of the oil tank static conductive.