CPC C04B 35/82 (2013.01) [C04B 35/62218 (2013.01); C04B 35/624 (2013.01); C04B 35/6264 (2013.01); C04B 35/62655 (2013.01); C04B 35/6365 (2013.01); C04B 2235/3206 (2013.01); C04B 2235/3272 (2013.01); C04B 2235/3418 (2013.01); C04B 2235/48 (2013.01); C04B 2235/522 (2013.01); C04B 2235/9607 (2013.01)] | 10 Claims |
1. A preparation method of a heat-insulating and flame-retardant nano-composite sheet, comprising the following steps:
S1: adding materials comprising an aerogel slurry, a flame retardant, an opacifying agent, fumed silica, a high-silica glass fiber, and a first additive into a stirring tank; and carrying out stirring until the materials are mixed uniformly to acquire a pasty composite slurry, wherein the aerogel slurry, the flame retardant, the opacifying agent, the fumed silica, the high-silica glass fiber, and the first additive are 50-70 parts by weight, 0.5-10 parts by weight, 0.5-10 parts by weight, 10-20 parts by weight, 5-10 parts by weight, and 0.3-0.6 parts by weight, respectively; the aerogel slurry is composed of silica aerogel powder and a wetting dispersion according to a weight ratio of (15-50): (50-85); and the wetting dispersion is composed of sodium carboxymethyl cellulose, a second additive, water, and ethanol according to a weight ratio of 1:1:50:40;
S2: filling a glue tray of a roller coating device with the pasty composite slurry acquired in step S1; and scrape-coating surfaces of a plurality of layers of a base material with the pasty composite slurry by using discharging assemblies of the roller coating device;
S3: drawing and collecting the plurality of layers of the base material acquired in step S2 at a compounding position; and carrying out pressurization to acquire a semi-finished product; and
S4: drawing the semi-finished product acquired in step S3 onto a coating line; and carrying out high-temperature drying to acquire the heat-insulating and flame-retardant nano-composite sheet, wherein a temperature for the high-temperature drying is 80° C. to 150° C.,
wherein the first additive is prepared by the following steps:
adding heptamethyl trisiloxane, methylbenzene, 1,2-epoxy-7-octene, and a palladium-carbon catalyst according to a ratio of 1 mol:550 mL:1.05 mol:0.004 g into a first reaction flask; heating the first reaction flask to 85° C.; carrying out stirring for a first reaction for 8 hours to acquire a reaction liquid; performing rotary evaporation on the reaction liquid to remove the methylbenzene to obtain a first resulting product; and carrying out vacuum drying on the first resulting product at 80° C. until a weight of the first resulting product is constant to acquire the first additive; and
the second additive is prepared by the following steps:
adding choline chloride, methanol, and calcium hydroxide according to a ratio of 1 mol:500 mL:1 mol into a second reaction flask; heating the second reaction flask to 65° C.; carrying out stirring for a second reaction for 12 hours to acquire a reaction mixture; cooling the reaction mixture to room temperature and carrying out filtering to acquire a filtrate; performing rotary evaporation on the filtrate to remove the methanol to obtain a second resulting product; and carrying out vacuum drying on the second resulting product at 100° C. until a weight of the second resulting product is constant to acquire the second additive.
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