Glass Resin Can Improve the Wear Resistance of These Substrates
Aug 30, 2024
Due to the small value of R: Si in glass resin (equal to or slightly greater than 1), high functionality, and small steric hindrance of methyl groups, the C2 pressure O-group is easily hydrolyzed, and the HO base is easily shrunk into a bulk structure. Therefore, this resin has the characteristics of low-temperature rapid curing and good film-forming properties. If a small amount of drying agent is added, the resin can be cured into a film within a few minutes at 50-60 ° C; Even without the addition of a drying agent, the film can still be cured by drying at around 100 ° C for several hours or leaving at room temperature for several days.
To protect the natural color, wear resistance, and ease of cleaning of flexible metal, glass, plastic, rubber, and other surfaces, a layer of wear-resistant coating is required. The excellent materials used as wear-resistant surface coatings are usually low R/Si ratio methyl silicone resin prepolymers (prepared as xylene or butanol solutions) made from three functional units (such as hydrolysis with methyl triethoxysilane or phenyl triethoxysilane) or four functional and three functional units as the main raw materials, hydrolyzed and condensed, coated on substrates, and further cured and crosslinked to form resins. This coating has good adhesion to the substrate, and after curing, it looks like glass, so it is also known as glass resin. It is a highly cross-linked silicone resin developed by Owens ILLi-nois in the late 1960s in the United States.
Usually, glass resin is impregnated and coated onto organic glass or transparent polycarbonate sheets. One pound of glass resin can be coated with 0 A 126mm thick coating of 300 square feet (1 foot=0 3048m), used on airplane windshields and windows, car rear windows, train car glass, safety doors and windows, etc. After coating with this glass resin, it can not only improve the wear resistance and chemical resistance of these substrates, but also enhance their transparency.
The only requirement for the coated substrate is sufficient stability at the curing temperature of the glass resin. Using different curing temperatures and times for different substrates, such as 90 ° C/48h for polyethylene and organic glass; ZZ0 ° C/18h for melamine; Polyvinyl chloride is 185 ° C/18h.
When irradiating this board with a 400W ultraviolet lamp, the distance between the board and the lamp is 26 24cm, after 1000h, the glass resin coated area remains clear and transparent, while the uncoated area turns yellow and dark. The glass resin coating on the board can withstand an impact of 15 foot pounds, which is about 60% greater than the impact resistance of polycarbonate. To apply this glass resin on glass, it is necessary to first apply a layer of butyl acetate or tin tetrachloride, which will decompose into oxides at high temperatures before applying the glass resin. Ordinary glass can withstand alkaline liquids after coating, while when coated on copper plates, it can withstand boiling 5% NaCl, 1% NaOH, or 1% HCI. When coating on copper or brass, 1% citric acid (or tartaric acid, gluconic acid) should be added for stabilization to prevent metal discoloration during coating curing.
Taking the coating of polycarbonate as an example, the method is introduced as follows: a 60% alcohol solution is prepared by hydrolysis of Zmol methyltriethoxysilane and lmol phenyltriethoxysilane. To 10mL of this solution, 5g of 2-thianyl-4-methoxybenzophenone ultraviolet absorber is added. The temperature is raised to 140 ° C within 80min to remove the solvent and preheated to obtain a prepolymer. 100g of the prepolymer is slowly dissolved in 100g of alcohol, and a 5mm thick polycarbonate plate is dipped and coated. The plate is matured at 135 ° C for 28 hours to obtain 0 A coating with a thickness of 01mm.
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