Method for preparing ultra-light thermal insulation material by using foam dispersed fly ash fibers

Abstract

The invention discloses a process for dispersing fly ash fibers by using foam and a method for preparing an ultra-light fly ash fiber thermal insulation material by using the process. Cement clinker, a foaming agent and a small amount of water are stirred for air entraining to form foam, and fly ash fibers are dispersed by volume formed by the foam to form a light structure. Compared with the traditional fiber pulping, papermaking and filter pressing forming process, the process has the advantage that the water consumption and drying energy consumption are obviously reduced. The fly ash fiber thermal insulation material prepared by the process has good apparent density consistency. The material is waterproof and fireproof, and can work in an environment below 650 DEG C for a long time. The apparent density of the material is between 0.08 g / cm < 3 > and 0.15 g / cm < 3 >, the heat conductivity coefficient of the material is between 0.035 W / (m.K) and 0.043 W / (m.K), and the material has good mechanical strength under dry and wet conditions. And more than 50 times of circulating freezing and thawing can be borne.

Description

technical field [0001] The invention discloses a foam dispersion process of fly ash fiber and a method for preparing ultra-light fly ash fiber heat insulating material by using the process. The invention belongs to a preparation method of a silicate light heat insulating material. The foam dispersion process is also suitable for the dispersion and material preparation of other fibers having similar properties to the "fly ash fibers" described herein. Compared with the traditional fiber pulping, papermaking, and filter press processes for forming and preparing plates, this process has a significant decrease in water consumption and a significant decrease in energy consumption for plate drying. The fly ash fiber ultra-light heat insulation material prepared by this process is suitable for construction and decoration fields such as heat preservation, heat insulation, fire prevention, and sound absorption. The combustion grade of the material is a grade A homogeneous material, w...

AI Technical Summary

Problems solved by technology

[0004] Because the composition of fly ash varies from coal to coal, it is difficult to control the diameter of fly ash fibers in production

Most of the projects launched at the beginning of this century have obvious defects in technology, equipment, and control, which has led to the production of ordinary fibers by domestic fly ash fiber factories. At present, ultrafine fibers account for less than 10%

[0010] The aforementioned CN 101249664A, CN 101250039A, CN 107324690A, and CN 107324690A technologies have the characteristics of simple process and low process cost, but it is difficult to achieve homogeneous refractory grade A, and they are not suitable for the production of light and ultra-light boards

Because the fly ash fiber does not have a suitable dispersion system, the density consistency on the differential unit area is not good

Although CN102826817A recorded 0.2g / cm 3 Light board with apparent density but its carding; sizing; molding; dry cutting process 0.2g / cm 3 It is also difficult to achieve ultra-lightweight panels with the following apparent densities

However, a large amount of process water causes great pressure on environmental protection and high energy consumption for drying. It is difficult to overcome the problems of complicated environmental assessment and high production costs in industrial production.

Images