A kind of high-performance modified vitrified microsphere and its surface modification method

Abstract

The invention discloses a high-performance modified vitrified microsphere and a surface modification method thereof. The invention adopts the carboxylated styrene-butadiene latex solution to coat the surface of the vitrified micro-beads, thereby reducing the water absorption rate of the vitrified micro-beads and improving the intrinsic strength of the vitrified micro-beads. The modified vitrified microspheres are applied to the thermal insulation mortar. When the consistency of the mortar is kept the same, the water demand of the thermal insulation mortar is reduced, the dry density is reduced, the specific strength is increased, the thermal conductivity is reduced, and the mortar strength and thermal insulation performance are improved. The surface modification method of the vitrified microspheres of the present invention only needs to use one modifier, and can be completed by a single device of a bottom-spray fluidized bed, has a simple process, saves labor, and is suitable for large-scale production and application in factories.

Description

technical field [0001] The invention belongs to the technical field of inorganic thermal insulation materials, and in particular relates to a high-performance modified vitrified microsphere and a surface modification method thereof. Background technique [0002] Vitrified microbeads are a kind of acidic vitreous lava minerals that are heated to 1100-1300°C in the electric furnace production process to make them porous inside, and then precisely control the temperature to 900-1000°C to make the surface vitrified and closed and spherical. Granular material, the main chemical composition is SiO 2 、Al 2 o 3 , CaO. The most prominent properties of expanded vitrified microspheres are light weight and excellent thermal insulation performance. In addition, it also has the advantages of non-combustibility, good construction workability, sound absorption and long service life. Vitrified microbeads are used as aggregate to make vitrified microbead mortar, which has good thermal in...

AI Technical Summary

Problems solved by technology

[0003] Due to the low level of process conditions and raw material control in the production process of vitrified microbeads, most of the vitrified microbead products on the market are of low quality, incomplete vitrification sealing, and high brittleness of the products. It is easy to crack or even break, resulting in more open holes on the surface of the vitrified beads, which has a high water absorption rate, which not only reduces the heat insulation performance of the vitrified beads, but also affects the strength of the vitrified beads mortar. Thereby limiting the popularization and application of vitrified microbead thermal insulation mortar

Therefore, there has been a technology to modify the surface of vitrified microbeads. The existing surface modification technology of vitrified microbeads is mainly to use silane water-repellent agents to modify the water absorption of vitrified microbeads. However, the strength of vitrified microbeads cannot be effectively increased, but the strength of vitrified microbead insulation mortar is reduced

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