US 12,168,633 B2
Heat-insulating and flame-retardant nano-composite sheet and preparation method thereof
Haibo Wang, Shenzhen (CN)
Assigned to GUOJIA GEL TECHNOLOGY INNOVATION CENTER (SHENZHEN) CO., LTD., Shenzhen (CN)
Filed by GUOJIA GEL TECHNOLOGY INNOVATION CENTER (SHENZHEN) CO., LTD., Shenzhen (CN)
Filed on Mar. 7, 2024, as Appl. No. 18/598,020.
Application 18/598,020 is a continuation of application No. PCT/CN2023/111641, filed on Aug. 8, 2023.
Claims priority of application No. 202211570931 (CN), filed on Dec. 8, 2022.
Prior Publication US 2024/0208872 A1, Jun. 27, 2024
Int. Cl. C04B 35/82 (2006.01); C04B 35/622 (2006.01); C04B 35/624 (2006.01); C04B 35/626 (2006.01); C04B 35/636 (2006.01)
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.