Film former plays the key role in waterborne ultra-thin intumescent fireproof coating for steel structures. This article has described the preparation of a core-shell silicone modifled acrylic emulsion by seed emulsion polymerization and a functional monomer of amino was in corporated in this polymerization.The structure of emulsion was characterized by FT-IR. The stability of the emulsion was tested. Tg of the emulsion film. determined by DSC, was 7.2 ℃, which proved that the emulsion has a lower Tg and minimum film forming temperature. Thermal degradation of emulsion film was investigated by TGA and the degradation temperature was 300. 0-440.0 ℃ which was in the same temperature range of intumescent fireproof coating system. Therefore, they have the synergistic effect in the intumescent system.
The stability of mixtures of silica sol and potassium(sodium)silicate as binder of 1 K coating at ambient temperature was investigated. The mixtures were characterized by using isothermal heat conduction microcalorimetry and measurements of particle size. Experimental results showed better stability for the mixtures containing small nano colloidal silica particles. And the stability was influenced by the molar ratio of silica to alkali metal oxide in potassium(sodium) silicate, the percentage by weight of silica sol in the mixture, operating conditions when mixing, raw material specifications, etc. When appropriate stabilizers was added, the mixture shored a significantly longer shelf life. Moreover. the shelf life of the binder which was prepared by mixing the mixture and stabilizers as well as styrene-acrylic emulsion can reach more than 7 months at ambient temperature.
Nano-SiO2 modified with KH550 can be dispersed in sizing, with low effect on the size and surface tension of sizing. The surface roughness of basalt fiber(BF) increases obviously after coating with sizing modified with nano-SiO2, as well the increases of breaking strength by 18. 75% and interlaminar shear strength by 18. 76%. It was confirmed by the oservation of dynamic contact angle meter(DCAM) and scanning electronic microscopy( SEM) that the interface compatibility between fibers and matrix resin was improved. The nano-SiO2 functions as bridge between fibers and epoxy resin.
The title self-stratifying hybrid cathodic electrodeposition coatings consisteted of self crosslinkable acrylic resin and epoxy resin were designed and synthesized. The effects of blocking agent and temperature of grafting reaction on the reaction process and properties of product were studied. And the effects of parameters of electrophoretic technology on the properties of paint films were also investigated systematically.The FTIR tests showed that the self-stratifying structure was formed in the hybrid coatings film and the film can provide good weather-resistance, good corrosion resistance and decorative performance and realized primer-topcoat in one coat.
The geling process and its cause of waterborne coating in use were described. The cansions and solutions for gelling prevention in production or uses of water-based coatings were proposed.
Our cultural heritage assets are subject to more and more damages with Industnal revolution and social progress. Silicone has reviewed compound has been studied and applied for protection of stony historic relics for almost one century. This paper the consolidation mechanism of silicone for stony historic relics, investigations and applications of different type of silicones on stone relics conserva, focusing on the new progress of silicone resins and oligomers, and their modification, as well as alkoxysilicane and partially polymerized alkoxysilane. In addition. the nective effect of silicone compounds used to protect the stony historic relics and the future trends and the prospective were discussed.
