Please select the most similar patent number from A, B, C and D. Which number is?
Disclosed is an aerogel fire-extinguishing agent, which comprises a modified silica aerogel and a silica sol. The aerogel fire-extinguishing agent is prepared by means of the following method: adding a silica aerogel into an aqueous polyethyleneimine solution with pH=5, and dispersing same until uniform to obtain a modified silica aerogel solution; and successively adding a silica sol and cellulose hydroxyethyl ether, and then dispersing same until uniform. The fire-extinguishing agent has a higher fire-extinguishing efficiency and a better ignition prevention effect.
A: Provided is a composite thermal insulation material and a preparation method therefor. The composite thermal insulation material is a cement-based silicon dioxide aerogel-diatomite composite thermal insulation material, and comprising, by mass: 40 to 70 parts of silicon dioxide aerogel-diatomite material, 100 parts of cement, 0.4 to 1.2 parts of polypropylene fiber, 4.2 to 5.1 parts of a coupling agent, 0.56 to 1.2 parts of cellulose ether and 2.8 to 5.1 parts of redispersible latex powder. For the composite thermal insulation material, fly ash is taken as a raw material, and diatomite is taken as a strength supporting material; the silicon dioxide aerogel-diatomite material is obtained by means of steps such as high-temperature calcination, sol-gel treatment, negative-pressure adsorption, water bath modification, and normal-pressure drying; then the silicon dioxide aerogel-diatomite material, cement and a proper amount of additives are evenly dry-mixed; and water is added, and stirring is conducted to obtain the composite thermal insulation material. The preparation method is simple and low-cost, the application performance of the obtained composite heat preservation and insulation material is good, and the strength meets building use requirements.
B: A composite aerosol fire extinguishing agent and a preparation method therefor. The composite aerosol fire extinguishing agent comprises, in percentage by weight: 8.6%-20.3% of calcium peroxide, 15.8%-27.7% of calcium sulfite, 8.4%-14.6% of modified starch, 9.2%-15.3% of carbon powder, 2.1%-8.3% of nano-crystalline cellulose, 9.6%-26.4% of basic copper carbonate, 3.5%-23.8% of sodium bicarbonate, 0.6%-3.8% of sodium alginate, and 0.9%-4.6% of epoxy resin. All the components of the aerosol fire extinguishing agent have an obvious synergistic effect, so that the whole aerosol fire extinguishing agent has high fire extinguishing capacity and fire extinguishing efficiency, has the advantages of small amount, high fire extinguishing speed, and high fire extinguishing efficiency, and is particularly suitable for extinguishing of oil fire sources.
C: Peroral nanoscale cyclophosphamide particles and a preparation method thereof. Silicon dioxide aerogel is used as a carrier. For the silicon dioxide aerogel, the porosity is 95 to 99%, the pore diameter is 10 to 50 nm, the specific surface area is 200 to 1000 m 2 /g, the density is 3 to 300 kg/m 3 , the gel particle diameter of the formation network is 1 to 50 nm, and the cyclophosphamide is adsorbed in the hole of the silicon dioxide aerogel to form cyclophosphamide particles with the diameter less than 100 nm. The preparation method is as follows: first dissolving cyclophosphamide in anhydrous ethanol, adding the silicon dioxide aerogel, drying after full adsorption, then adding purified water, feeding into an emulsifying machine for emulsification, homogenizing through a high pressure homogenizer, and then drying.
D: The present invention provides a nanoporous solid acid based on a silica aerogel and a preparation method therefor. In the nanoporous solid acid based on a silica aerogel of the present invention, the solid acid is dispersed in a nanoporous structure of the silica aerogel, and the weight ratio of the solid acid to the silica aerogel is 1:10-100. In addition, the present invention also provides use of the nanoporous solid acid based on a silica aerogel in catalyzing the Maillard reaction intermediate pyrolysis. The research finds that the nanoporous solid acid based on a silica aerogel of the present invention has higher catalytic activity than the conventional solid acid to the Maillard reaction intermediate pyrolysis, and can promote release of aroma substances.
Answer: B