CN1162619A

CN1162619A - Foamed poisonless refractory heat insulation powder

Info

Publication number: CN1162619A
Application number: CN96103684.2A
Authority: CN
Inventors: 吴绍军
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-04-16
Filing date: 1996-04-16
Publication date: 1997-10-22

Abstract

A foaming-type non-toxic refractory insulating powder which is bluish white down substance contains such components as sepiolite, carboxymethylcellulose, light calcium carbonate, graphite, aluminium silicate and foaming agent, and features high working temp (-100-3000 deg.C), 2-3 times of expansion coefficient, long storage period (more than 10 years), long service life and no poison. It can be used as insulating paint, especially suitable for industrial furnaces.

Description

Foamed poisonless refractory heat insulation powder

The invention belongs to technical field of refractory materials, is a kind of foamed poisonless refractory heat insulation powder.

Existing sepiolite composite heat-insulating coating Applicable temperature is-40 ℃--+700 ℃, the outward appearance of this kind coating is greyish white thick shape lotion, shelf-time had only about 3 months, therefore transportation and sale at a distance, and this kind coating is smeared each thickness can not surpass 10mm, molding shrinkage is about 30%, and constructional difficulties easily comes off, cracking, hollowing, inwall do not have phenomenons such as closed pores.This kind coating is met the easy efflorescence of the water capacity after smearing, work-ing life is short.This kind coating is owing to containing the asbestos composition, and is therefore toxic, causes environmental pollution.Therefore existing sepiolite composite heat-insulating coating exists deficiencies such as Applicable temperature is lower, constructional difficulties, the finished product utilization ratio is low, the shelf-time short, work-ing life is short, toxic.

The objective of the invention is to design higher, the easy construction of a kind of Applicable temperature, shelf-time length, long service life, avirulent powder insulation, in order to substitute existing sepiolite composite heat-insulating coating.

For reaching above-mentioned purpose, the main technical schemes that the present invention taked is to adopt sepiolite, carboxymethyl silk dimension plain (CMC), light calcium carbonate, graphite, pure aluminium silicate, whipping agent, promotor, scorch retarder etc., according to different components directly pulverize, after screening, selection by winnowing be mixed, be greyish white velvet-like thing through hot-air spray drying, be foamed poisonless refractory heat insulation powder.

The present invention provides a kind of ideal foamed poisonless refractory heat insulation powder for technical field of refractory materials.The major ingredient of this kind powder insulation is a sepiolite, and sepiolite belongs to non-metallic mineral products, has unsurpassed heat-insulating property; This kind powder insulation contains carboxymethyl silk dimension plain (CMC), is the inorganic adhesive of producing as basic raw material with linters, and nonpoisonous and tasteless, cohesive force is strong; The whipping agent that this kind powder insulation contains is an inorganic foaming agent, therefore uses in the product process, can produce a large amount of closed-cell, and these abscesses can play good insulation heat-insulating property; The contained light calcium carbonate of this kind powder insulation can alleviate the unit weight of product, improves the intensity of abscess, increases the service life; The contained pure aluminium silicate of this kind powder insulation is resistant to elevated temperatures inorganic product, has the good fire resistance energy.

This foamed poisonless refractory heat insulation powder of the present invention is owing to contain above-described composition, Applicable temperature is-100 ℃--+3000C finished product is the velvet-like thing of canescence, the normal storage time can reach more than 10 years, and available common Polywoven Bag packing is adapted to remote transportation and sale.In construction, use at any time can add water furnishing pasty state in powder insulation, need how thickly can once smear, and volumetric expansion has closed-cell of one's own, only needs 40 minutes to get final product drying, and moulding expansion 2-3 times, it is very convenient to construct, and the finished product utilization ratio can reach 100%.This kind powder insulation uses the back to meet not modification, not efflorescence of water, and can be moulded various section bars, its tensile strength 〉=0.4MPa, cohesive strength 〉=20MPa as required.This foamed poisonless refractory heat insulation powder of the present invention is applicable to that not only building equipment, pipeline, valve, jar, tower etc. use as insulation, thermal insulating coating, more be applicable to the stove insulation of glass-ceramic industry, smelt, high temperature places such as the body of heater of power industry, furnace wall heat insulation.For example on the body of heater of steelmaking furnace, use this kind powder insulation can reduce calorific loss to the utmost, thermosteresis is reduced to every square metre per hour about 200 kilocalories, thereby can reduce stove to greatest extent because of shared ground of insulated wall thickening area, reduce the investment of building stove, therefore had very considerable social benefit.Compared with prior art, this foamed poisonless refractory heat insulation powder of the present invention has the Applicable temperature height, remarkable advantages such as the shelf-time is long, benefit transportation, easy construction, long service life scope are wide, nontoxicity, finished product utilization ratio height.

Further specify the concrete feature of this foamed poisonless refractory heat insulation powder of the present invention in conjunction with example.

This foamed poisonless refractory heat insulation powder of the present invention adopts sepiolite 20-50%, plain (CMC) 5-10% of carboxymethyl silk dimension, light calcium carbonate 10-20%, pure aluminium silicate 5-10%, whipping agent 2-8%, promotor 0.3--1.8%, scorch retarder 0.01--0.2% or employing sepiolite 20-40%, plain (CMC) 5-10% of carboxymethyl silk dimension, light calcium carbonate 10-20%, graphite 5-15%, pure aluminium silicate 5-10%, whipping agent 2-4%, promotor 0.3--0.9%, scorch retarder 0.01--0.2%, through following technical process:

Make foamed poisonless refractory heat insulation powder of the present invention.

The sepiolite 40% of filling a prescription, graphite 15%, pure aluminium silicate 10%, whipping agent 4%, scorch retarder 0.1%, promotor 0.9%, carboxymethyl silk dimension is plain 10%, light calcium carbonate 20%.The powder insulation that this prescription is produced can be used as refractory powder and is used for industrial furnace about temperature+3000 degree.

Plain (CMC) 10% of two sepiolites 50%, the carboxymethyl silk dimension of filling a prescription, light calcium carbonate 20%, pure aluminium silicate 10%, whipping agent 8%, promotor 1.8%, scorch retarder 0.2%.The powder insulation that this prescription is produced can be used as the heat insulating that thermal insulation coatings is used for buildings, pipeline.

Claims

1, a kind of foamed poisonless refractory heat insulation powder is characterized in that containing sepiolite, carboxymethyl silk dimension plain (CMC), light calcium carbonate, graphite, pure aluminium silicate, whipping agent, promotor, scorch retarder;

2, foamed poisonless refractory heat insulation powder as claimed in claim 1, it is characterized in that described each component concentration is respectively sepiolite 20-50%, plain (CMC) 5-10% of carboxymethyl silk dimension, light calcium carbonate 10-20%, pure aluminium silicate 5-10%, whipping agent 2-8%, promotor 0.3-1.8%, scorch retarder 0.01--0.2%;

3, foamed poisonless refractory heat insulation powder as claimed in claim 1 is characterized in that described each component concentration is respectively sepiolite 20-40%, carboxymethyl silk dimension plain (CMC) 5-10%, light calcium carbonate 10--20%, graphite 5--15%, pure aluminium silicate 5--10%, whipping agent 2--4%, promotor 0.3--0.9%, scorch retarder 0.01--0.2%.