RU2526063C2 - Kl-1v cable fireproofing composition - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to structural chemistry and specifically to fireproofing materials, and is intended for application of a fireproofing coating on a single cable, a bundle of cables or cable lines during construction of different buildings and structures for preventing flame propagation on the surface of the cable. The fireproofing composition includes thermally expanded graphite, a styrene-acrylic dispersion, a fire retardant - ammonium polyphosphate, functional additives - kaolin, ethylene glycol, a paraffin-based antifoaming agent and a urethane thickener, with the following ratio of components, wt %: ammonium polyphosphate 5-15; oxidised graphite - 10-20; kaolin - 5-15; styrene-acrylic dispersion - 45-60; plasticiser (chlorinated paraffin wax, KHP-470, KHP-70) - 0.5-5; antifoaming agent - 0.1-1; urethane thickener - 0.1-0.8; ethylene glycol - 0.5-5; water - the balance.

EFFECT: improved fireproofing effect of the coating owing to improved adhesion, low film-forming temperature of the material, low toxicity of combustion products and high resistance to liquid media during use.

Description

The invention relates to the chemistry of building materials, and in particular to the field of fire retardant materials, and is intended for applying a fire retardant coating to a single cable, a bundle of cables or cable lines during the construction of various buildings and structures to ensure flame propagation over the cable surface.

The invention can be used in residential and industrial buildings, engineering, energy facilities and nuclear power plants both indoors and outdoors.

Known flame retardant composition for cables (RF patent No. 2249557 C1), including acrylic dispersion as a binder, pentaerythritol, ammonium polyphosphate, melamine, titanium dioxide, ethylene glycol, glycerin, plasticizer, cellulose ethers and water. The disadvantage of this composition is the high filling of the system with dry substances and, as a result, poor resistance to liquids.

The closest analogue is the composition for obtaining flame retardant coatings (RF patent No. 2272057), including, by weight:

thermally expanding graphite - 10-30;

acrylic dispersion - 40-80;

magnesium oxide - 10-20;

antimony oxide - 5-10;

borates - 5-10;

salts of phosphoric acid - 10-35.

The disadvantages of this composition is the use of an ineffective mixture of toxic antimony (III) oxide, borates, salts of phosphoric acids and magnesium oxide as flame retardants, an acrylic copolymer prone to brittleness and cracking at low temperatures as a binder, as well as high toxicity of combustion products according to GOST 12.1 .044-89.

The objective of the present invention is to increase the fire-retardant efficiency of the coating by improving the adhesion, lowering the film-forming temperature of the material, reducing the toxicity of the combustion products and increasing the resistance to the effects of liquid media during operation.

The technical result is to increase flame retardant efficiency, reduce smoke generating ability and toxicity of combustion products, improve the performance of the coating.

The technical result is achieved by the fact that the fire retardant composition includes thermally expanding graphite, styrene-acrylic dispersion, flame retardant - ammonium polyphosphate, as well as functional additives - kaolin to increase resistance to moisture, ethylene glycol to reduce the minimum film-forming temperature, paraffin-based antifoam and urethane thickener as a structure-forming agent and a rheological additive, in the following ratio of components, wt.%:

ammonium polyphosphate - 5-15;

oxidized graphite - 10-20;

kaolin - 5-15;

styrene-acrylic dispersion 45-60;

plasticizer (chloroparaffin, HP-470, HP-70) - 0.5-5;

antifoam - 0.1-1;

urethane thickener - 0.1-0.8;

ethylene glycol - 0.5-5;

water is the rest.

The essence of the invention lies in the fact that the flame retardant composition, including thermally expanding graphite, instead of an acrylic copolymer (as in the prototype) contains styrene-acrylic dispersion, instead of a mixture of antimony oxide (III), borates, salts of phosphoric acids and magnesium oxide, it contains a highly effective flame retardant - ammonium polyphosphate as well as functional additives - kaolin to increase resistance to moisture, ethylene glycol to lower the minimum temperature of film formation, antifoam based on paraffin and urethane thicken . L as a nucleating agent and a rheological additive, with the following ratio of components, wt%: Ammonium polyphosphate with a long chain - 5-15; oxidized graphite - 10-20; kaolin - 5-15; styrene-acrylic dispersion 45-60; plasticizer - 0.5-5; defoamer -0.1-1; urethane thickener - 0.1-0.8; ethylene glycol - 0.5-5; water is the rest.

The invention is illustrated by examples.

Example 1

The composition was prepared as follows: the components were sequentially loaded into a mixing tank and mixed for 100 minutes.

The following content of components was taken, wt.%:

ammonium polyphosphate - 5;

oxidized graphite - 20;

kaolin - 15;

styrene-acrylic dispersion - 45;

plasticizer (chloroparaffin, HP-470, HP-70) - 5;

antifoam - 1;

urethane thickener - 0.8;

ethylene glycol - 0.5;

water is the rest.

Paint was applied on a previously prepared cable surface with a thin layer of 0.8 mm. Applied to the cable surface by airless spray.

Assessment of fire-retardant coating efficiency was carried out according to GOST P 53311.

The service life of the coating based on the composition is at least 15 years.

Resistance to liquid aggressive environments without loss of flame retardant efficiency of 72 hours.

Transportation and storage of the composition is carried out at temperatures from plus 5 ° C to plus 40 ° C.

Example 2

The composition was prepared as follows: the components were sequentially loaded into a mixing tank and mixed for 120 minutes.

The following content of components was taken, wt.%:

ammonium polyphosphate - 15;

oxidized graphite - 10;

kaolin - 5;

styrene-acrylic dispersion - 60;

plasticizer (chloroparaffin, HP-470, HP-70) - 0.5;

antifoam - 0.1;

urethane thickener - 0.1;

ethylene glycol - 5;

water is the rest.

Paint was applied on a previously prepared cable surface with a thin layer of 0.4 mm. Put on a cable surface manually.

Assessment of fire-retardant coating efficiency was carried out according to GOST P 53311.

The service life of the coating based on the composition is at least 15 years.

Resistance to liquid aggressive environments without loss of flame retardant efficiency of 79 hours.

Transportation and storage of the composition is carried out at temperatures from plus 5 ° C to plus 40 ° C.

The film-forming temperature of the material is almost 50 ° C lower than in the prototype.

Reducing the toxicity of combustion products in relative units to 15%.

Example 3 (comparative)

The composition was prepared as in Example 2:

the components were sequentially loaded into the mixing tank and mixed for 120 minutes at the following component content, wt.%:

ammonium polyphosphate - 4;

oxidized graphite - 9;

kaolin - 16;

styrene-acrylic dispersion - 62;

plasticizer (chloroparaffin, HP-470, HP-70) - 0.1;

antifoam - 1.3;

urethane thickener - 1.0;

ethylene glycol - 6;

water is the rest.

Paint was applied on a previously prepared cable surface with a thin layer of 0.4 mm. Put on a cable surface manually.

Assessment of fire-retardant coating efficiency was carried out according to GOST P 53311.

The service life of the coating based on the composition is 2 years.

Resistance to liquid aggressive environments without loss of fire retardant efficiency of 20 hours.

Transportation and storage of the composition is carried out at temperatures from plus 5 ° C to plus 40 ° C.

Example 4

The composition was prepared as in Example 1, but in a different ratio, wt.%:

ammonium polyphosphate - 7;

oxidized graphite - 11;

kaolin - 6;

styrene-acrylic dispersion - 50;

plasticizer (chloroparaffin, HP-470, HP-70) - 4;

antifoam - 0.15;

urethane thickener - 0.18;

ethylene glycol - 0.9;

water is the rest.

On a previously prepared cable surface, paint was applied manually with a thin layer of 0.6 mm.

Assessment of fire-retardant coating efficiency was carried out according to GOST P 53311.

The service life of the coating based on the composition is 25 years.

Resistance to liquid aggressive environments without loss of flame retardant efficiency of 80 hours.

Transportation and storage of the composition is carried out at temperatures from plus 5 ° C to plus 40 ° C.

The film-forming temperature of the material is almost 50 ° C lower than in the prototype.

Reducing the toxicity of combustion products in relative units to 15%.

Claims (1)

Fire retardant composition including thermally expanding graphite, styrene-acrylic dispersion, flame retardant - ammonium polyphosphate, as well as functional additives - kaolin to increase resistance to moisture, ethylene glycol to reduce the minimum film-forming temperature, paraffin-based antifoam and urethane thickener as a structure-forming agent additives, in the following ratio of components, wt.%: ammonium polyphosphate 5-15; oxidized graphite - 10-20; kaolin - 5-15; styrene-acrylic dispersion 45-60; plasticizer (chloroparaffin, HP-470, HP-70) - 0.5-5; antifoam - 0.1-1; urethane thickener - 0.1-0.8; ethylene glycol - 0.5-5; water is the rest.