Composition to obtain a fire-retardant material and method thereof

 

(57) Abstract:

Usage: the invention relates to the field of production of fireproof materials for protection of metal and wooden constructions. The inventive composition to obtain a fire-retardant material contains silicophosphate binder with a density of 1.48 - 1.52 g/cm3on the basis of liquid glass modified by alkali metal tripolyphosphate 51,3 and 78.6%, hardener 8 - 10% solution of boric acid 0,8 -5,1%, the foaming agent IS 1-based sodium salts of alkylaromatic sulfonic acids kerosene distillation 3.9 to 10.3 percent, the filler (expanded perlite, expanded vermiculite or flageolet or possibly in a mixture with mineral oxide filler) - the rest. The composition is produced by mixing a binder and a foaming agent, followed by introduction into the foam filler and a foaming mixture, the curing agent serves in the mixture separately. Characteristic properties: curing time of the coating 2 to 10 hours, the compressive strength of 0.8 - 1.0 MPa, a fire at a coating thickness of 10 mm to 90 hours, the stability of the foam is 24 hours. 2 S. and 2 C.p. f-crystals, 3 tables.

The invention relates to the field of building materials and mo"ptx2">

Known composition to obtain a flame retardant material comprising a binder and a filler (ed.St. The USSR N1625856, CL C09D 5/18, 1991).

The closest technical solution is fire resistant material comprising a binder, an inorganic filler, a foaming agent and a curing agent (U.S. patent N 4118325, CL C09K 3/28, 1978).

The disadvantages of flame retardant material on the basis of the above compositions are its high bulk density, low fire resistance and a long time of hardening. This is due to the presence of a large number of hardener fluoride of sodium silicate (Na2SiF6approximately 16% additionally, the presence of Na2SiF6reduces the melting point of the coating, which leads to a reduction of the effect of the thickness of the layer of fire protection during fire exposure and reduce the fire resistance of the coating. The introduction of a mixture of a large quantity of curing agent needed to reduce the time of curing of the coating.

A method of obtaining fire resistant material comprising a mixture of binder and filler (ed. St. USSR N 1625856, CL C09D 5/18, 1991).

The disadvantages of this method are the inability to control the timing of hardening coatings and limited to what is a method of obtaining a flame retardant material by foam preparation of binder and foaming agent, mix foam with an inorganic filler and a curing agent (U.S. patent N4118325, CL C09K 3/28, 1978).

The disadvantage of this method is the inability to control the time of hardening of the material due to the joint submission of the curing agent and other components of the mixture.

The invention is directed to the solution of the technical problem associated with a decrease in bulk density, time of hardening of the coating and improve its fire resistance.

The invention consists in that the fire retardant material comprising a binder, an inorganic filler, a foaming agent and a curing agent as a foaming agent used to mark ON-1 on the basis of the Na-salts of alkylaromatic sulfonic acids kerosene distillate, and as a hardener 8 10% aqueous solution of boric acid in the following ratio, wt.

binder 51,3 78,6

8 10% aqueous solution of boric acid 0,8 5,1

the foaming agent IS 1 3,9 10,3

filler rest

In addition, the filler may be used in mixture or expanded vermiculite, expanded perlite, or phlogopite mineral filler at a ratio of 0.1:1 to 1:1.

The inventive foaming agent, mixing the foam with inorganic filler and the hardener supply of hardener in the system carry out offline.

As filler use of expanded vermiculite, expanded perlite, flageolet, as well as their mixtures with fine-grinded fillers such as alumina, silica, fly ash CHP at a ratio in parts by weight of 0.1:1 to 1:1.

As a binder use a solution of liquid glass modified with potassium tripolyphosphate, silicophosphate binder density of 1.48 -1,52 g/cm3. Used as a hardener 8 -10% aqueous solution of boric acid in a quantity of 0.8 to 5.1 wt. allows you to adjust the curing time of the coating.

The use of an aqueous solution of boric acid concentration of less than 8% would not achieve the required time of curing of the coating. Getting the same aqueous solution of boric acid concentrations of more than 10% is difficult, since boric acid is poorly soluble in water. Curing the binder boric acid is characterized by the following reaction:

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With the introduction of 8% to 10% aqueous solution of boric acid in the amount of less than 0.8 wt. curing occurs very slowly, and the introduction of a solution of boric acid Unia, cement stone is not formed.

Use as a filler mixture of expanded vermiculite, expanded perlite, phlogopite with it fillers, such as alumina, silica, fly ash CHP at a ratio in parts by weight of 0.1:1 1: 1 leads to an increase in the strength of the coating. The presence in the mixture of fine-grinded fillers allows to obtain a coating with high mechanical strength. However, increasing the strength of the coating leads to a reduction of its resistance. Therefore, the ratio of components in the filler in the century. ch. of 0.1:1 to 1:1 is optimal.

With the introduction of the mixture of the filler is less than 16.7 wt. unable to obtain a coating of the desired mechanical strength.

With the introduction of the filler is more than 33.3 wt. decreases the resistance of the coating.

Used as a foaming agent, emulsifier allows to obtain a coating with a low bulk density, high fire resistance, and the foam is stable in time. In addition, the emulsifier used IS 1 not decomposed in an alkaline environment. The amount of emulsifier in wt. 3,9 -10,3 is optimal.

With the introduction of the emulsifier is less of 3.9 wt. unable to obtain a coating with a low volume weight is the main supply of the hardener into the system allows you to adjust the amount of the curing agent and the time of curing of the coating.

Examples of specific performance.

In installation capacity of SCHOOL-1 pour silicophosphate binder density of 1.48 1.52 g/cm3enter the estimated amount of the emulsifier, to form a fine foam, then enter the filler and again the mass is subjected to foaming.

The hardener is served separately to the gun nozzle through which the mixture is applied on a protected surface.

In table.1 and 2 shows the composition and physical-mechanical properties of flame retardant material, produced by the proposed method and according to the prototype.

Firing tests of samples was conducted in accordance with the requirements of ST SEV 1000-78. The tests were conducted in the Main, research and testing centre for fire safety Snieska.

As can be seen from the table. 2, fire retardant coating, manufactured by the proposed method have better mechanical and fire retardant properties than coatings made according to the prototype.

Using silicophosphates binder was made three of composition, in which as the source component for the synthesis used sodium silicate with silica modulus of 1.6 and 2.4 and 2.9.received from sodium silicate with various siliceous module.

As an emulsifier in obtaining foam used gastromony product IS 1.

Example 1.

51,3 wt.h. silicophosphates binder concentration of solids 45% siliceous module source sodium liquid glass 2,9 were placed in a laboratory mixer, which added to 10.3 wt.h. emulsifier-1. The mixture was wspanialy for 2 to 3 minutes, after which it was introduced 33.3 wt.h. exfoliated vermiculite and was stirred suspension of 2 more 3 minutes Then the resulting foam spray gun inflicted on a metal surface, Autonomous mixing the composition with 5.1 wt.h. 8% boric acid.

51,3 wt.h. silicophosphates connecting with the source module of liquid glass to 1.6 at the same concentration as in example 1, was mixed from 10.3 wt.h. emulsifier-1. The rest analogously to example 1.

Example 3.

51,3 wt. including silicophosphates binder with the original module, sodium liquid glass to 2.4. The rest is similar to examples 1 and 2.

Physico-mechanical characteristics of the coatings obtained from the compositions indicated in examples 1 to 3 shown in table. 3.

As seen from the above table. 3, the silica source module when receiving silicophosphates svetousileniya fire-retardant material, including an inorganic binder, inorganic filler, a foaming agent and a curing agent, characterized in that it contains as inorganic binders silicophosphate binder with a density of 1.48 1.52 g/cm3on the basis of liquid glass modified by alkali metal tripolyphosphate, as the inorganic filler, expanded vermiculite, expanded perlite, or phlogopite, as a foaming agent, the foaming agent IS 1-based sodium salts of alkylaromatic sulfonic acids kerosene distillate, as a hardener 8 10% solution of boric acid in the following ratio, wt.

Specified silicophosphate binder with a density of 1.48 1.52 g/cm3- 51,3 78,6

8 10% solution of boric acid 0,8 5,1

The specified foaming agent IS 1 3,9 10,3

Expanded vermiculite, expanded perlite, or phlogopite Else

2. The composition according to p. 1, characterized in that it further contains mineral oxide filler.

3. The method of preparation of flame retardant material by mixing and foaming inorganic binder, a foaming agent, an inorganic filler and a curing agent, characterized in that the UP> on the basis of liquid glass modified by alkali metal tripolyphosphate, as filler, expanded vermiculite, expanded perlite, or phlogopite, as a foam - blowing agent-1 based on sodium salts of alkylaromatic sulfonic acids kerosene distillate, as a hardener 8 10% solution of boric acid, you get the foam from the binder and foam, then the foam is mixed with the filler, the mixture foamed and separately apply the hardener in the following ratio, wt.

Specified silicophosphate binder with a density of 1.48 1.52 g/cm3- 51,3 78,6

8 10% solution of boric acid 0,8 5,1

The specified foaming agent IS 1 3,9 10,3

Expanded vermiculite, expanded perlite or phlogopite Else

4. The method according to p. 3, characterized in that the composition of the mixture as a filler impose additional mineral oxide filler.

 

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