Liquid low-molecular siloxane rubber-based composition for coating fire-proof material

FIELD: chemistry.

SUBSTANCE: composition comprises liquid low-molecular siloxane rubber, ethylsilicate-40 or tetraethoxysilane as a curing agent, alkoxytitranium borate and vanadium pentoxide. Components are in the following ratio, pts.wt: liquid low-molecular siloxane rubber - 100, ethylsilicate-40 or tetraethoxysilane - 10-30, alkoxytitranium borate - 10-30, vanadium pentoxide - 10-20.

EFFECT: high water-resistance, wear-resistance and fire-resistance of the coating.

2 cl, 1 tbl

 

The invention relates to the chemical industry, in particular to compositions based on liquid low molecular weight siloxane rubber for coating fire-resistant protective material.

The level of technology

Known curable compositions based on liquid low molecular weight siloxane rubbers SCTN of different brands containing a hardener (tetraethoxysilane, ethyl silicate-40, ethyl silicate-32), as well as catalysts, which are used, as a rule, ORGANOTIN compounds (O.N. Debts, M.G. Voronkov, BTW, Grinblat. Silicone liquid rubber and materials on their basis. L.: Chemistry, 1975). These compositions are widely used in electrical and radio engineering, aeronautical engineering, in the automotive industry, in medicine, in the production of rolled textile materials with a siloxane coating and other industries.

The common disadvantage of these compositions is the low duration of their stability at room temperature (5-15 minutes), because of the structuring composition thickens, which does not allow to organize the process of production of rolled textile materials with a siloxane coating. Moreover, these compositions lack of fire resistance, water resistance and mechanical properties obtained on the basis of the volcano is organized coatings.

Known composition to obtain a flame resistant textile materials, including low-molecular siloxane rubber, tetraethoxysilane or ethyl silicate-40 as a curing agent and a titanium containing compound (patent of Russia №2265683, publ. 2005) It contains as titanium containing compounds ester of ortho-Titanic acid - tetraethoxysilane, tetrapropoxide, tetraisopropoxide or tetrabutoxide. However, the duration of the steady state composition is small, the adhesion to synthetic fabrics low, the resulting material is hard, and fire resistance material coated on its basis is low (less than 30 seconds when exposed to an open flame).

The closest to the essential features of the technical solution is based composition of the liquid low-molecular siloxane rubber for fire-retardant material containing as a hardener ethyl silicate-40 and tetraethoxysilane and titanium containing compound - alkoxycarbonyl (ethoxycarbonyl, propoxycarbonyl, butoxycarbonyl) (patent of Russia №2460751, publ. 2012). This composition has a high duration stability at room temperature, high strength vulcanized coating with nylon cloth.

The disadvantage of the composition is a significant vodopronitsaemost is, not enough high abrasion resistance of the resulting coatings and low resistance of the obtained protective materials.

The invention

Inventive task was in search of compositions based on liquid low molecular weight siloxane rubber for fire protective material comprising ethyl silicate-40 or tetraethoxysilane as a hardener and alkoxycarbonyl, which would have a high water resistance, abrasion resistance and fire resistance of the obtained protective materials.

The problem is solved by a composition based on liquid low molecular weight siloxane rubber for fire protective material containing as a hardener ethyl silicate-40 or tetraethoxysilane, alkoxycarbonyl and vanadium pentoxide in the following ratio of components, parts by weight:

liquid low-molecular siloxane rubber100
hardener 10-30 alkoxycarbonyl10-30
vanadium pentoxide10-20

The hallmark of the invention is the optional use of vanadium pentoxide.

However as alkoxycarbonyl it contains ethoxycarbonyl, or propoxycarbonyl, or butoxycarbonyl. The claimed composition has the following advantages:

- higher water-resistant protective materials;

- high resistance material with a coating of the claimed composition to abrasion;

- higher resistance of protective materials obtained with a coating of this composition up to 5 min when exposed to an open flame.

Information confirming the possibility of carrying out the invention.

For carrying out the invention can be used the following substances:

as low molecular weight liquid siloxane rubber can be used any low molecular weight liquid silicon rubber SCTN grades a, B, C, G (GOST 13875-73);

as a hardener - ethyl silicate-40 (GOST 26371-74, MEAs. 2) or tetraethoxysilane (TU 2435-419-0576344-2003, MEAs. 1);

as alkoxycarbonyl can be used ethoxy-or propoxy-, or butoxycarbonyl;

vanadium pentoxide (vanadium pentoxide) (TU 6-09-4093-88).

Alkoxycarbonyl were obtained by well-known methods by mixing 6 parts by weight of boric acid with 100 parts by weight of the corresponding ester of ortho-Titanic acid at room temperature without access of moisture to obtain a clear solution (R. field, P. Cove. Organic chemistry of Titan. M.: Mir, 1969, 180-181).

The composition is prepared p is the mixing in the proper quantity of liquid low-molecular siloxane rubber SCTN, hardener, alkoxycarbonyl and vanadium pentoxide to the formation of homogeneous mass.

To obtain a protective fire-resistant material composition is applied on nylon fabric art. 56007 two strokes with heat treatment after drawing each stroke at 160-165°C. in a heat chamber within 2-3 minutes.

Qualitative indicators of the claimed compositions and prototype, as well as indices of the materials made use of these compositions was determined in the same manner:

the resistance under the action of an open flame - according to GOST R-95;

the water resistance of the Purse - according to GOST 22944-78, resistance to abrasion according to GOST 8975-75 with ISM. 1.2.3. The composition and properties of the compositions and quality materials with a coating based on them are given in the table.

These tables indicate higher performance materials obtained with the use of the claimed composition. The fire resistance of the materials obtained with the use of the claimed composition, 2 times higher than the resistance of the materials obtained using the prototype. The water resistance of the Purse is 3 times higher than materials using the composition of the prototype. The resistance of the coatings to abrasion from materials obtained with the use of the claimed compositions, 1.4-1.7 times higher than that of the materials of the prototype.

<> 1. Composition based on liquid low molecular weight siloxane rubber for fire protective material comprising ethyl silicate-40 or tetraethoxysilane as a hardener, alkoxycarbonyl, characterized in that it further comprises vanadium pentoxide in the following ratio of components, parts by weight:
liquid low-molecular siloxane rubber100
the hardener10-30
alkoxycarbonyl10-30
vanadium pentoxide10-20.

2. The composition according to claim 1, characterized in that as alkoxycarbonyl it contains ethoxycarbonyl or propoxycarbonyl, or butoxycarbonyl.



 

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