Prepn of single-component high-hardness silicone glass resin
A glass resin and silicone technology, applied in the coating and other directions, can solve the problems of low transparency of the silicone resin-forming film, inability to form a transparent protective coating, limited application scope, etc., and achieve cheap preparation cost, dense structure, and transparency. Good results
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Embodiment 1
[0024] The first is the preparation of nano-silica dispersion. Weigh 100g of industrial grade crystalline silicon powder (about 200 mesh), soak it in 120g of hot water (deionized water) and activate it for about 12 minutes, then slowly add it dropwise to 650g of dilute hydrogen oxide with a concentration of 0.36% by mass. In the sodium aqueous solution (temperature is about 65-68°C), react at 91-93°C until no bubbles are generated, cool to room temperature, filter with a Buchner funnel, and concentrate to obtain SiO 2 A nano-silica dispersion with a content of 25-30%, the pH of the nano-silica dispersion is 8.2-10.6, and the density is 1.16-1.20 g·cm -3 , where SiO 2 The diameter of nanoparticles is 10-25nm.
[0025]Next, at room temperature, put methyltriethoxysilane (MTES) into a single-necked flask equipped with a ground stopper, add acetic acid calculated according to the volume ratio as follows with a micro-pippet, and stir with a magnetic stirrer uniform. Mix the nan...
Embodiment 2
[0029] The process of this embodiment is the same as that of Example 1, but it is necessary to adjust the volume ratio of the nano-silica dispersion in Example 1: MTES: acetic acid: water to 8.00: 12.00: 0.20: 1.50, and keep stirring until the reaction system consists of two The time for phase change to one phase is about 6 hours. After stopping the stirring, transfer the reaction liquid to the container, seal it, and let it stand at room temperature for about 42 hours, so that a certain degree of polycondensation reaction occurs, then centrifuge the reaction liquid, and add 0.70 volume of the total prepolymer propanol, so that the solid content of the silicone glass resin is equal to 20%, then add polyether silicone oil that occupies 0.6% of the total mass of the silicone glass resin prepolymer, stir evenly, seal the container, and let it stand at room temperature for use. After the coating is cured, the pencil hardness of the thin film coating is ≥7H.
Embodiment 3
[0031] This embodiment technique is identical with embodiment 1, but needs the methyltriethoxysilane (MTES) in embodiment 1 to be changed into methyltrimethoxysilane (MTMS), nano silicon dioxide dispersion liquid: MTES: The volume ratio of acetic acid:water was adjusted to 7.00:6.00:0.05:0.02, and the stirring was continued until the two phases of the reaction system changed into one phase for about 3 hours. After stopping the stirring, transfer the reaction solution to the container, seal it, and let it stand at room temperature for about 45 hours. After a certain degree of polycondensation reaction, the reaction solution is centrifuged, and 1.01 volume of the total prepolymer is added. propanol, so that the solid content is equal to 21%, and then add polyether silicone oil occupying 0.8% of the total mass of the silicone glass resin prepolymer (liquid resin), stir evenly, seal the container, stand at room temperature for use, and apply Film, the pencil hardness of the cured ...
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Abstract
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