Liquid low-molecular siloxane rubber-based composition for making fire-resistant material

FIELD: chemistry.

SUBSTANCE: liquid low-molecular siloxane rubber-based composition for fire-resistant material also contains ethyl silicate-40 or tetraethoxy silane as a curing agent and a titanium-containing compound in form of alkoxytitanium borate, where the alkoxy groups are ethoxy, propoxy or butoxy groups.

EFFECT: composition having high stability and adhesion to synthetic fabrics, which increases fire-resistance and reduces hardness of material with a coating made from said composition.

1 tbl

 

Introduction

The invention relates to the chemical industry, in particular to compositions based on liquid low molecular weight siloxane rubber for the manufacture of fire-resistant 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 (Ontogov, Mgorshkov, Mpegable "liquid Silicone rubbers and materials on their basis". L.: Chemistry, 1975). These compositions are widely used in the electrical and electronic industry, aviation and space technology, 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 a short time of their stability at room temperature (5-15 minutes), as further 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 resistance and mechanical strength obtained on the basis of the coatings and the low adhesion to synthetic fabrics.

Known composition based on liquid low molecular weight siloxane rubber for fire-resistant material (patent of Russia №2203933, publ. 2003).

It contains a liquid low molecular weight siloxane rubber stamps a, B, C, D, as a hardener - tetraethoxysilane or ethyl silicate-40, and as a catalyst - octoate tin (catalyst 230-19, THE 6-02-539-75) or catalyst No. 18 (TU 6-02-805-78), representing a solution of determinability tin in the ethyl silicate-32 in a weight ratio of 1:4.

However, the resistance of the coated material on the basis of this composition is small (not more than 25 when exposure to an open flame).

Also known (patent of Russia №2394858, 2010) composition based on liquid low molecular weight siloxane rubber used for the manufacture of fire-resistant protective material on nylon fabric. It contains a liquid low molecular weight siloxane rubber stamps a, B, C, D, as a hardener - ethyl silicate-40 and oleic acid, as catalyst - metallophthalocyanine.

This composition has a high duration of a stable condition during storage at room temperature 13-20 days, which allows its use in the production of rolled textile flame-retardant materials.

However, the materials coated on the basis of this composition are insufficient agnostic is here (~1 min when exposed to an open flame), significant stiffness of the materials and the low adhesion of the obtained cured siloxane coating to synthetic fabrics.

The closest to the essential features of the technical solution is a composition for obtaining a flame-retardant 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 a titanium containing compound ether orthotitanate acid (tetraethoxysilane, tetrapropoxide, tetraisopropoxide or tetrabutoxide).

However, the time to steady state composition is small, the adhesion to synthetic fabrics low, hard material, and the resistance material coated on its basis is low (less than 30 with exposure to an open flame).

The invention

Inventive task was in search of compositions based on liquid low molecular weight siloxane rubber for fire-resistant material comprising the curing agent is ethyl silicate-40 or tetraethoxysilane and titanium containing compound, which would have greater stability and adhesion to synthetic fabrics and material coated on its basis would provide a higher resistance and lower the gesture of the awn.

The problem is solved by a composition based on liquid low molecular weight siloxane rubber for fire-retardant material containing as a hardener - ethyl silicate-40 or tetraethoxysilane and titanium containing compound, which as a titanium containing compound contains alkoxycarbonyl, where the alkoxy-group - ethoxy-, propoxy - or butoxy-group in the following ratio of components, parts by weight:

liquid low-molecular siloxane rubber100
the hardener10-30
alkoxycarbonyl10-30

The hallmark of the invention is the use of alkoxycarbonyl.

The claimed composition has the following advantages:

- longer time to steady state;

- high adhesion of vulcanized siloxane coatings to synthetic fabrics;

- higher resistance of protective materials obtained by coating this composition (up to 2.5 minutes when exposed to an open flame);

- low rigidity of the obtained protective materials.

Information confirming the possibility of carrying out the invention.

For done by the means of 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 13835-73);

as a hardener - ethyl silicate-40 (GOST 26371-74, ISM) or tetraethoxysilane (TU 2435-419-05763441-2003, am.1);

as such compounds can be used ethoxy-, propoxy - or butoxycarbonyl.

Alkoxycarbonyl were obtained by well-known methods by reacting 6 parts by weight of boric acid with 100 parts by weight of the corresponding ether orthotitanate acid with stirring at room temperature without access of moisture to obtain a clear solution (RFID, Pcov. Organic chemistry of Titan. M.: Mir, 1969, s-181).

The composition is prepared by mixing in the proper quantity of liquid low-molecular siloxane rubber SCTN, hardener and alkoxycarbonyl before the formation of a homogeneous mass.

To obtain a protective fire-resistant material composition is applied, for example, nylon fabric art 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:

stability in salino, the loss of fluidity of the paste that is associated with the onset of gelation;

the stability of the siloxane coating to abrasion - according to GOST 8975-75 with am.1, 2, 3;

the resistance of the material according to GOST R 50810-95;

the stiffness of the material according to GOST 8977-74;

the adhesion of the composition to synthetic fabric on the bond strength of vulcanized coating on the fabric substrate - according to GOST 17317-71.

The composition and properties of the compositions and quality materials with coatings based on them are given in the table.

These tables indicate higher performance and composition, and materials obtained with the use of the claimed composition. So, for the duration of stability at room temperature of the claimed composition is 5 times more stable than the composition of the prototype. The bond strength of the coating to the substrate in the claimed compositions is also higher than that of the prototype. The fire resistance of the materials obtained with the use of the claimed compositions, 4-5 times higher fire resistance of the materials obtained using the prototype. The rigidity of the materials obtained with the claimed composition, ~ 2 times lower than with the composition of the prototype.

Table
The compositions, the duration of their stability properties is as protective materials and prototype
The components of the compositions to coverThe content of components, parts by weightthe placeholder
Liquid silicon rubber SCTN
grade a100---100---100
brand B-100---100---
mark--100---100 --
mark G---100---100-
ethyl silicate-4010-20-30-203025
the tetraethoxysilane-10-20-30---
tetrabutoxide25
ethoxycarbonyl--10--30--
propoxycarbonyl-20--30--10-
butoxycarbonyl--30--10---
Properties and compositions of the obtained materials
The duration of the stability of the compositions at room temperature, d16152018171920143
The fire resistance of materials12513014013515014514814630
The resistance of the coatings to abrasion, g/kW h657066616864606375
The bond strength of the coating with nylon cloth art, N/cm8,18,59,5the 10.111,010,610,910,42,5
Rigidity, SN8280717861626569150

Composition based on W is Drago low molecular weight siloxane rubber for fire-resistant material, including ethyl silicate-40 or tetraethoxysilane as a curing agent and a titanium containing compound, characterized in that it as a titanium containing compound contains alkoxycarbonyl, where the alkoxy-group - ethoxy-, propoxy - or butoxy-group in the following ratio of components, parts by weight:

liquid low-molecular siloxane rubber100
the hardener10-30
alkoxycarbonyl10-30



 

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