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Surface modifier for vitreous micro-bead insulation aggregate and modified vitreous micro-bead insulation aggregate

A surface modifier and vitrified microbead technology, which is applied in the field of vitrified microbead thermal insulation aggregate surface modifier and vitrified microbead thermal insulation aggregate, can solve the problems of limited influence of perlite water absorption change, etc. It is convenient for large-scale promotion, improves surface strength, and has the effect of high utilization rate

Active Publication Date: 2013-11-06
武汉威尔博科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when drying in an oven, after exceeding 50°C, the change of temperature has limited influence on the change of water absorption of perlite

Method used

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  • Surface modifier for vitreous micro-bead insulation aggregate and modified vitreous micro-bead insulation aggregate
  • Surface modifier for vitreous micro-bead insulation aggregate and modified vitreous micro-bead insulation aggregate
  • Surface modifier for vitreous micro-bead insulation aggregate and modified vitreous micro-bead insulation aggregate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1. Preparation of metakaolin: The kaolin is heated from room temperature to 850° C. for 2 hours, kept for 3 hours, and naturally cooled to below 100° C. to obtain metakaolin.

[0034] Table 1 Performance comparison of vitrified microbeads before and after modification

[0035]

[0036] It is shown in Table 1 that the water absorption rate of the vitrified microbeads is relatively high before modification, but after modification, the water absorption rate is reduced from 42% to 18%, indicating that after the modification of the vitrified microbeads, the surface of the vitrified microbeads is modified by a layer of surface Coating agent, thereby reducing its water absorption, particle size and bulk density increase, resulting in a slight increase in thermal conductivity than before modification. At the same time, the surface strength is enhanced, so that the cylinder compressive strength (volume loss rate at 1MPa pressure, %) is reduced from 46% to 20%.

[0037] The t...

Embodiment 2

[0048] 1. Preparation of metakaolin: Kaolin is heated from room temperature to 820°C for 3 hours, kept for 3 hours, and naturally cooled to below 100°C to obtain metakaolin;

[0049] Table 4 Performance comparison of vitrified microbeads before and after modification

[0050]

[0051] It is shown in Table 4 that the water absorption rate of the vitrified microbeads is relatively large before modification, but after modification, the water absorption rate is reduced from 42% to 16%, indicating that after the modification of the vitrified microbeads, the surface of the vitrified microbeads is modified by a layer of surface Coated with a neutral agent, thereby reducing its water absorption. Because the surface of vitrified microbeads is coated with a layer of modifier, its particle size and bulk density increase, resulting in a slight increase in thermal conductivity before modification. At the same time, the surface strength is enhanced, reducing the cylinder compressive str...

Embodiment 3

[0063] 1. Preparation of metakaolin: Kaolin is heated from room temperature to 800°C for 2.5 hours, kept for 4 hours, and naturally cooled to below 100°C to obtain metakaolin;

[0064] Table 7 Performance comparison of vitrified microbeads before and after modification

[0065]

[0066] Table 7 shows that after the surface modification of the vitrified microbeads, a layer of modifier is wrapped on the surface, so that the water absorption rate is reduced, the surface strength is enhanced, and the particle size, bulk density and thermal conductivity are increased.

[0067] Using vitrified microbeads before and after modification as aggregate, thermal insulation mortar was prepared, and the effect of vitrified microbeads on thermal insulation mortar was studied by changing the ratio of vitrified microbeads to the cementitious material.

[0068] Table 8 Proportion of vitrified microbead insulation mortar

[0069]

[0070] 2. Preparation of modified sodium silicate: mix the...

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Abstract

A surface modifier for vitreous micro-bead insulation aggregate is mainly prepared by mechanical grinding of portland cement, slag powder, metakaolin, modified sodium silicate, an adjustable solidification agent and a solid filling into the specific surface area of 300-400 m<2> / kg. The mass percents of the above raw materials are as follows: by weight, 10-20% of portland cement, 40-60% of slag powder, 15-30% of metakaolin, 3-8% of the modified sodium silicate, 0.2-1.0% of the adjustable solidification agent and 3.0-15% of the solid filling. Under the condition of alkali activation, highly active minerals (diatomite and metakaolin) rapidly gain strength and wrap the surface of the insulation aggregate, so as to minimize the problem that an insulation material has low mechanical properties and poor insulation effects as the insulation aggregate is easy to pulverize and has high water absorption rate. Prepared by the adoption of all-inorganic raw materials, the surface modifier for vitreous micro-bead insulation aggregate has good compatibility with micro-beads. Simultaneously, the invention also discloses the vitreous micro-bead insulation aggregate modified by the use of the surface modifier.

Description

technical field [0001] The invention belongs to the field of building materials, more specifically it is a vitrified microbead thermal insulation aggregate surface modifier, and the invention also relates to vitrified microbeads modified by the vitrified microbead thermal insulation aggregate surface modifier insulation aggregate. Background technique [0002] Vitrified microbeads are the most commonly used thermal insulation aggregates in thermal insulation materials. They are calcined at 1150-1250°C from natural perlite, and the glass quality gradually softens. The internal moisture diffuses in the form of water vapor, and the surface is vitrified by rapid cooling. , forming spherical porous particles with closed cells on the surface. It can replace the application of traditional aggregates such as fly ash floating beads, expanded perlite, and polystyrene particles. It is an environmentally friendly high-performance inorganic light-weight thermal insulation material. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B28/08
Inventor 魏泽胜苏雷王鹏飞
Owner 武汉威尔博科技发展有限公司