RU2394858C1 - Liquid low-molecular siloxane rubber based composition for making fire-resistant material - Google Patents

Abstract

FIELD: chemistry. ^ SUBSTANCE: invention relates to liquid low-molecular siloxane rubber based compositions for making fire-resistant material. The invention discloses a composition of fire-resistant material which contains the following (pts. wt): liquid low-molecular siloxane rubber (100), ethylsilicate-40 (10-20), oleic acid (7-9), and metal phthalocyanine, where the metal is tin, iron, cobalt or copper (0.5-1). ^ EFFECT: preparation of a composition which is more stable compared to its counterparts and increases wearing- and fire-resistance of the material with a coating based on the said composition. ^ 1 cl, 1 tbl

Description

Introduction

The invention relates to the chemical industry, in particular to a composition based on liquid low molecular weight siloxane rubber for the manufacture of flame retardant material.

The level of technology.

Known curable compositions based on liquid low molecular weight siloxane rubbers SKTN of various grades containing a hardener (tetraethoxysilane, ethyl silicate-40, ethyl silicate-32), as well as catalysts, which are usually used as organotin compounds (O.N. Dolgov, M. G. Voronkov, MP Greenblat “Organosilicon liquid rubbers and materials based on them”, Chemistry, 1975). These compositions are widely used in the electrical and radio engineering industries, in the aerospace industry, in the automotive industry, in medicine, in the production of rolled textile materials with siloxane coating and other industries.

A common drawback of all compositions based on liquid low molecular weight siloxane rubbers SKTN containing structuring agents, i.e. hardeners, and organotin catalysts, is the low physico-mechanical strength of the obtained siloxane coatings, in particular abrasion resistance, as well as a short stability time at room temperature - 5-15 minutes, because further due to structuring the composition thickens and becomes unsuitable for technological the production process of rolled textile materials with a siloxane coating.

The closest technical solution is described in Russian patent No. 2203933, 2003, a composition based on liquid low molecular weight siloxane rubber SKTN, used for the manufacture of flame retardant material on nylon fabric. It contains low molecular weight siloxane rubber of grades A, B, C, D, as a hardener - tetraethoxysilane or ethyl silicate-40, and as a catalyst - tin octoate (catalyst 230-19, TU 6-02-539-75) or catalyst No. 18 (TU 6-02-805-78), which is a solution of tin diethyl dicaprylate in ethyl silicate - 32 in a weight ratio of 1: 4.

However, this composition has the following disadvantages: low abrasion resistance of coatings based on it (~ 500 g / kW · h), low fire resistance of the material coated with this composition, when exposed to an open flame for no more than 25 seconds, short stability time of the composition at room temperature (10-15 min), since then, due to structuring, it thickens and becomes unsuitable for the technological process of production of rolled textile materials with a siloxane coating.

SUMMARY OF THE INVENTION

The technical result of the invention is high abrasion resistance of the coating based on the claimed composition, high fire resistance of the material with this coating and high stability of the composition.

The specified technical result is achieved by a composition based on liquid low molecular weight siloxane rubber for a flame-retardant material, which also includes ethyl silicate-40 as a hardener and a catalyst that additionally contains oleic acid and metal phthalocyanine as a catalyst, where metal is tin, iron, cobalt or copper, at the following content of components, parts by weight:

liquid low molecular weight siloxane rubber one hundred ethyl silicate-40 10-20 oleic acid 7-9 metallophthalocyanine 0.5-1

Distinctive features of the invention are the additional use of oleic acid, and as a catalyst, the use of metallophthalocyanine, where the metal is tin, iron, cobalt or copper.

The claimed composition has the following advantages:

- higher resistance to abrasion of the coating of fire-resistant material obtained using this composition, up to 60 g / kW · hour;

- higher fire resistance of the material obtained using this composition is up to 65 seconds;

- significantly higher stability of the composition when stored at room temperature - up to 20 days.

Information confirming the ability to reproduce the invention.

For the implementation of the invention can be used the following substances:

- as a low molecular weight liquid siloxane rubber, any low molecular weight siloxane rubber SKTN of grades A, B, C, G can be used (GOST 13835-73);

- as a hardener - ethyl silicate-40 (GOST 26371-74, amend. 2);

- oleic acid brand B-115 (TU 9145-172-4731297-94);

- phthalocyanines of tin, iron, cobalt or copper. They can be obtained by fusion of phthalonitrile with chlorides of the corresponding metals (Advances in Inorganic Chemistry and Radiochemistry / Ed. A.B. P. Lever: Cambridge, England. 1965. Vol.7. P.28-105).

The composition is prepared by mixing the liquid low molecular weight siloxane rubber SKTN, ethyl silicate 40, oleic acid and the catalyst to form a homogeneous mass.

To obtain a flame-retardant material, the composition is applied to a nylon fabric, for example, art.56007, with two strokes with heat treatment after applying each stroke at 160-165 ° C in a heat chamber for 2-3 minutes.

The stability of the claimed composition and the composition of the prototype, as well as the quality indicators of materials manufactured using these compositions, were determined identically: stability — visually, by the loss of fluidity of the paste associated with the onset of gelation; resistance to abrasion of siloxane coatings - in accordance with GOST 8975-75 rev. 1, 2, 3; fire resistance of materials in accordance with GOST 12.1.1004-91.

The properties of the compositions and the flame retardant materials obtained with their use on nylon fabric are shown in the table. These tables indicate higher rates of the claimed composition and obtained with its use of fire-resistant materials.

Table The composition of the compositions, the duration of their stability, the properties of protective materials and prototype Coating Composition Components The content of components, parts by weight prototype Liquid siloxane rubber SKTN brand A one hundred - - - one hundred - - - one hundred - - - one hundred SKTN brand B - one hundred - - - one hundred - - - one hundred - - - SKTN brand B - - one hundred - - - one hundred - - - one hundred - - SKTN brand G - - - one hundred - - - one hundred - - - one hundred - Ethyl silicate-40 fifteen 10 twenty 12 10 12 fifteen twenty fifteen 12 10 twenty fifteen Oleic acid 8 7 9 8 7 8 9 8 7 9 8 7 - Tin Phthalocyanine 0.75 - - - 0.5 - - - one - - - - Iron phthalocyanine - 0.75 - - - 0.5 - - - one - - - Cobalt phthalocyanine - - 0.75 - - - one - - - 0.5 - - Copper phthalocyanine - - - 0.75 - - - one - - - 0.5 - Tin Octoate - - - - - - - - - - - - 3 Properties of the compositions and the resulting materials The duration of the stability of the compositions at room temperature, day fifteen 12 twenty eighteen fourteen 16 twenty eighteen 17 fifteen 19 13 15 minutes Abrasion resistance of coatings, g / kW · h 60 65 70 80 66 84 67 72 60 62 78 85 505 Fire resistance of materials, sec 62 60 58 55 52 fifty 53 51 65 63 45 42 25

Claims (1)

A composition based on liquid low molecular weight siloxane rubber for a flame-retardant material, which also includes ethyl silicate 40 as a hardener and a catalyst, characterized in that it additionally contains oleic acid, and as a catalyst metal phthalocyanine, where the metal is tin, iron, cobalt or copper at the following content of components, parts by weight:
liquid low molecular weight siloxane rubber one hundred ethyl silicate-40 10-20 oleic acid 7-9 metallophthalocyanine 0.5-1