Preparation method of hydrophobic heat-insulating aerogel mortar

Abstract

The invention belongs to the technical field of preparation of building materials, and particularly relates to a preparation method of a hydrophobic heat-insulating aerogel mortar. Green algae and sepiolite are respectively used as raw materials to prepare dehydroxylated cellulose and an activated stone slurry, nanofibers are placed into the activated stone slurry and are processed to obtain a dispersed slurry, and composite sponge fibers, polydimethylsiloxane and liquid paraffin are mixed and fermented, and then are dried to obtain a hydrophobic aerogel powder. The sepiolite fibers are adsorbed on surfaces and in pores of the organic nanofibers to increase the pore surface area, and phosphoric acid molecules permeate into a petrochemical sponge slurry to dissolve out carbonate salts and break through interlayer and pore channel impurities in order to form high-density nano-pores, so the thermal insulation performance of the mortar is greatly improved; and blind holes and internal channels of the fiber sponge are opened by oily substances such as polydimethylsiloxane under the action of microorganisms in the fermentation modification process, so that the surface of the fiber spongeis roughened, the oleophylic and hydrophobic properties of the fiber sponge are improved, materials are saved, and the fiber sponge has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of building material preparation, and in particular relates to a method for preparing hydrophobic and heat-insulating airgel mortar. Background technique [0002] The mortar is composed of ordinary portland cement, polymer redispersible latex powder, related additives, anti-cracking substances and quartz sand of different grades. It has the advantages of good adhesion, crack resistance and impact resistance, hydrophobicity, durability, etc., and is mainly used for building exterior wall insulation. Among them, thermal insulation mortar has been widely used due to its non-combustibility, convenient construction and long service life. With the rapid development of the urban construction industry and the improvement of people's living standards, people have higher and higher requirements for the performance of thermal insulation mortar. However, in the actual use process, there is still the disadvantage of un...

AI Technical Summary

Problems solved by technology

[0007] The technical problem mainly solved by the present invention is aimed at the airgel mortar preparation process. Due to the strong water absorption of the airgel, the nanoporous structure of the airgel is easily damaged by the water in the mortar and water-based additives, etc., and the loss of airgel The defect of excellent thermal insulation performance brought by the characteristics of nanoporous structure provides a preparation method of hydrophobic thermal insulation airgel mortar