RU2467041C2 - Method of obtaining fire-retardant intumescent composition - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to fire-retardant intumescent materials. The method of obtaining a fire-retardant intumescent composition, consisting of a polymer binder based on organic polymer solutions, mono-substituted monoammonium phosphate, pentaerythritol, melamine, titanium dioxide, microtalc, propylene glycol and additives to achieve colour characteristics and improving dispersability.

EFFECT: larger intumescent layer of fire-retardant coatings based on organic polymer solutions.

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Description

SUMMARY OF THE INVENTION

The invention relates to the field of flame retardant intumescent materials based on a polymeric binder, phosphoric acid compounds, pentaerythritol and other ingredients that form at high temperatures - fire - oligomers with aldehydes and emit gaseous products, creating foamy, durable, poorly heat-conducting structures, called after carbonization - carbonization - with foam coke.

All well-known and representative publications on the technology of fire retardant intumescent compositions, for example [1-3], consider ammonium salts of polyphosphoric acid as one of the required ingredients: polyphosphates of ammonium, melamine and their combinations. As binders, various polymer film formers can be used; As a rule, preference is given to water-dispersion systems, environmentally friendly, adhesive-active and easily forming a film under conditions of positive temperatures. Such conditions are usually observed during construction and repair work.

We found that in the case of using organic polymer solutions as a binder, the use of polyphosphates gives results in expansion and, consequently, in protective efficiency, noticeably different for the worse in comparison with monoammonium phosphate. Water in this case is completely excluded from the system.

The use of monoammonium phosphates in aqueous media is indeed unacceptable, since the ability of the system to form a full-fledged foam coke layer completely degenerates after several days of storage of the initial composition.

At the same time, the use of organic polymer solutions in the case of using equimassive amounts of monoammonium phosphates instead of polyphosphates gives a 15–25% increase in the intumescent layer.

Various stabilizing additives may also be introduced (may not be introduced) into the fire retardant intumescent composition: pigments - to give the desired color; coalescents - to improve film formation; antiseptics - to improve the microfauna and microflora; fillers - to improve the applicability of others.

Example 1 (control).

The composition was made and dispersed in a bead mill at room temperature. The concentration of the ingredients of the composition in wt.% Amounted to:

Solvent R-4 - 42.0

PSH-LS Perchlorvinyl Resin - 7.5

Plasticizer dibutyl phthalate - 7.5

Titanium dioxide - 4.0

Pentaerythritol - 11.0

Melamine - 11.0

Ammonium Polyphosphate - 17.0

Phosphoric acid - 1.0

Microtalc - 1.0

Propylene glycol - 1.0

Upon receipt of the system with milling less than 60 microns, the mixture was unloaded from a bead mill. The resulting composition was applied in a 2.5 mm layer on a metal plate 1.5 mm thick. The applied layer was dried to constant weight. The plate was placed in a muffle furnace at a temperature of 800 ° C for 2 minutes. The thickness of the expanded carbonized protective layer was (when testing 5 simultaneously manufactured samples) an average of 40.3 mm.

Example 2 (control).

As in example 1, but

Solvent R-4 - 37.0%

Ammonium Polyphosphate - 22.0

The thickness of the expanded carbonized layer under the same test conditions averaged 43.5 mm.

Example 3

As in example 1, but instead of ammonium polyphosphate introduced monosubstituted monoammonium phosphate 17 wt.%.

The thickness of the expanded carbonized layer under the same test conditions averaged 49 mm.

Example 4

As in example 2, but instead of ammonium polyphosphate introduced monosubstituted monoammonium phosphate 22 wt.%.

The thickness of the expanded carbonized layer under the same test conditions averaged 52 mm.

Example 5 (control).

The composition was made, as in example 1, but instead of solvent P-4, solvent 646 - 42.0% was taken. Instead of resin, PSX-LS took polyvinyl acetate bead 7.5 wt.%.

Example 6

As in example 5, but instead of ammonium polyphosphate introduced monosubstituted monoammonium phosphate 17 wt.%.

The thickness of the expanded carbonized layer averaged 47 mm.

Example 7 (control).

The composition was made, as in example 1, but instead of solvent P-4, a solvent of toluene 646 - 42.0 wt.% Was taken. Instead of the PSX-LS resin and the dibutyl phthalate plasticizer, a copolymer of methyl methacrylate with butyl methacrylate 12 wt.% Was taken.

The test was carried out under the conditions specified in example 1.

The thickness of the expanded carbonized layer was 456 mm.

Example 8

As in example 7, but the toluene solvent was taken 37 wt.% And instead of ammonium polyphosphate introduced monosubstituted monoammonium phosphate 22 wt.%.

The thickness of the expanded carbonized layer averaged 52 mm.

Example 9

The composition was made as in Example 7, but instead of the copolymer of methyl methacrylate with butyl methacrylate, the same copolymer of styrene and butyl methacrylate was taken. The rest is as in example 8.

The thickness of the expanded carbonized layer averaged 50 mm.

Economic aspect: the market value of polyphosphates is 5-10 times higher than that of monosubstituted monoammonium phosphates.

Thus, a method for producing a fire retardant intumescent composition consisting of a polymeric binder, ammonium phosphate, pentaerythritol, melamine and stabilizing additives is proposed to achieve color characteristics and improve dispersibility, characterized in that in organosoluble polymer systems in the composition to increase its technological and economic efficiency instead of ammonium polyphosphate, an equimass amount of monosubstituted monoammonium phosphate is introduced.

Information sources

1. Pat. RF №2224775 C1, 2004. Fireproof intumescent paint.

2. Pat. RF №2225423 C1, 2004. Fireproof intumescent paint.

3. Pat. RF №2174527 C1, 2001. Fireproof intumescent paint.

Claims (1)

A method of obtaining a fire retardant intumescent composition consisting of a polymer binder, ammonium phosphate, pentaerythritol, melamine, titanium dioxide and additives to achieve color characteristics and improve dispersibility, characterized in that organic polymer solutions are used as a polymer binder, and monosubstituted monoammonium phosphate as ammonium phosphate and further comprising microtalc and propylene glycol.