FR2812881A1 - ANTI-FIRE COMPOSITION OF POLYOL AND POLYISOCYANATE CONTAINING AN INTRUMESCENT AND ELECTRICAL INSULATION SYSTEM - Google Patents

Abstract

The subject of the invention is an anti-fire composition which comprises: * 100 parts of a component A comprising: - 15 to 80, preferably 35 to 50, parts by weight of at least one polyol having an average functionality greater than 2 and a Brookfield viscosity measured at 25degC less than 10,000 mPa. 5 to 80, preferably 15 to 50 parts by weight of an intumescent system; 0 to 60, preferably 10 to 40, parts by weight of mineral fillers; 0 to 10, preferably 0 to 5, parts by weight of additives; 10 to 60, preferably 15 to 30, parts by weight of a component B comprising at least one polyisocyanate having a functionality equal to or greater than 2 and a Brookfield viscosity measured at 25 ° C between 20 mPa. s and 45,000 mPa. s. By simply mixing the components A and B, an intumescent polyurethane is obtained.Application: electrical insulation with excellent heat shield properties.

Description

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 The present invention relates to the field of thermal insulation and more particularly that of electrical insulation. It relates to an "anti-fire" composition based on a polyol and an isocyanate which is suitable for the fire protection of various materials, in particular high-voltage or low-voltage electrical cables, track beacons. railway, in particular those in tunnels, insulating joints of gas pipes which are grounded, electronic components which must be encapsulated.

 In general, if there is a temperature rise in an electrical cable, a fire may be triggered if the cable is not protected; such a fire can spread very rapidly and cause serious accidents, especially in confined atmospheres, such as those in tunnels.

 Intumescent and flame retardant polyurethane compositions are already known. These compositions are in particular the thermoplastic polyurethane compositions containing a combustion retarding mixture consisting of a pentate and a phosphate described in EP 0 188 650 A2.

 Other flexible and intumescent thermoplastic polyurethane compositions are described for example in EP 050 908 A2 and EP 0 051 347 A2.

These compositions are in the form of foam.

 These compositions, which are thermoplastic, are not suitable for forming appropriate heat shields in electrical systems: insufficient mechanical strength, too low water resistance, unimaginable electrical insulation in high voltage, making parts in situ inappropriate.

 We have now found a composition "anti fire" based on a polyol and an isocyanate, having not only excellent mechanical performance (flexibility and adhesion), chemical (water resistance), electrical (insulating), but above all excellent fire resistance and great ability to achieve a heat shield, alone or in combination with other components.

 The fire-resistant composition according to the invention contains, as essential ingredients: * 100 parts by weight of a component A based on polyol, said component A comprising: - 15 to 80, preferably 35 to 50, parts by weight of at least one polyol;

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 - 5 to 80, preferably 15 to 50 parts by weight of an intumescent system; 0 to 60, preferably 10 to 40, parts by weight of mineral fillers; 0 to 10, preferably 0 to 5, parts by weight of additives; 10 to 60, preferably 15 to 30, parts by weight of a component B comprising at least one polyisocyanate.

Thus, the anti-fire composition according to the invention is a "two-component" composition containing no solvent.

Component A
Component A of the anti-fire composition according to the invention consists of a mixture comprising a polyol, an intumescent system, and optionally, mineral fillers and additives.

* Polyol
The polyol of component A is a polyol or a mixture of polyols having an average functionality greater than two and whose Brookfield viscosity measured at 25 ° C. is less than 10,000 mPa.s, preferably between 100 mPa.s and 10,000 mPa.s. . Advantageously, the polyol is used in admixture with a chain extender, for example 1,4-butanediol or dipropyleneglycol (DPG), said chain extender being used in a proportion of from 0 to 10 parts by weight. per 100 parts by weight of the polyol.

 This polyol is chosen from polyhydroxylated polyesters, polyhydroxylated polyethers, polyhydroxylated polyacrylates, polyhydroxylated polyether-polyesters and hydroxylated polybutadienes, or mixtures thereof.

 A family of polyols which is particularly suitable for the purposes of the invention consists of polyhydroxy polyethers obtained by reacting a polyalkylene oxide, such as, for example, ethylene oxide or propylene or tetrahydrofuran oxide, which generates by ring opening a polyoxytetramethylene, with a glycol, such as neopentyl glycol, bisphenol A; trimethylolpropane; glycerol. These polyols are generally diols, triols or tetrols.

 Another family of polyols suitable for the purposes of the invention is polyhydroxylated polyesters, preferably those which are saturated;

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 they are obtained by reacting at least one polyol with a polycarboxylic acid or anhydride or a lactone.

 A third family of polyols suitable for the purposes of the invention consists of polyhydroxy polyacrylates. Castor oil (natural product) can also be used as a polyol for the purpose of the invention.

 Finally, hydroxylated polybutadienes having a Brookfield viscosity measured at 25 ° C. of less than 10,000 mPa · s can also be used as polyols.

By way of examples of polyols which are suitable for the purposes of the invention, mention may be made of the following compounds which may be used alone or as mixtures: polyoxypropylene / polyoxyethylene triol marketed by the
ARCO company under the trade name "ARCOL 1342"; hydroxylated polybutadiene marketed by the Company
ATOCHEM (France) under the trade name "polyBD45"; polyhydroxylated polyether marketed by the company BAYER (Germany) under the trade name "BAYGAL K55"; hydroxylated linear polyether marketed by the Company
BAYER (Germany), under the trade name "DESMOPHEN 1900U".

 the polyol based on polyether and polyester groups marketed under the name DYPOL 6862 by the company DYFLEX.

* The intumescent system
The intumescent system of component A of the composition according to the invention comprises two essential constituents, namely at least one acidic catalyst, and at least one nitrogenous compound. Advantageously, the intumescent system also contains at least one carbon compound.

 The proportion of the various constituents of the intumescent system is as follows: 10 to 90, preferably 15 to 80, parts by weight of an acid catalyst; 0 to 45, preferably 0 to 20, parts by weight of a carbon compound; 5 to 75, preferably 25 to 65, parts by weight of a nitrogen compound.

 The acid catalysts which are suitable for the purposes of the invention are chosen from monoammonium phosphate, diammonium phosphate,

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 ammonium polyphosphate, melamine phosphate, guanylurea phosphate, ammonium sulphate and ammonium borate.

 The carbon compound which enters into the composition of the intumescent system according to the invention is chosen from polyols, sugars and phenols which are commonly used in intumescent systems.

 Preferably, this carbon compound is chosen from dipentaerythritol, glucose and resorcinol. It is also possible to use graphite or an epoxidized or non-epoxidized bisphenol A, for example the epoxidized bisphenol A marketed under the trade name EPON 828 by Shell.

 The intumescent system based on ammonium polyphosphate marketed by BUDENHEIM (Germany) under the trade name "BUDIT 3077" may advantageously be used as component of component A according to the invention.

 This intumescent system "BUDIT 3077" can be advantageously used in combination with another ammonium polyphosphate, for example the ammonium polyphosphate marketed by BUDENHEIM under the trade name "FR CROS484" as a flame retardant.

 The nitrogenous compound of the intumescent system according to the invention is chosen from melamines, guanidine, glycines ureas, dicyanodiamides, cyanurates or borates of melamine, such as, for example, melamine cyanurate "BUDIT 315" and melamine borate. "BUDIT 313", marketed by the BUDENHEIM Company. The intumescent system operates as follows: under the action of heat, the acid catalyst releases an acid (sulfuric acid, boric acid or phosphoric acid) and ammonia.

 The acid thus released attacks the carbon chains present in component A and forms esters of sulfuric acid, boric acid or phosphoric acid which themselves decompose in the form of large quantities of carbon, carbon dioxide and carbon dioxide. water. The acid again released by this thermal reaction continues the reaction above. Simultaneously with this decomposition of the esters, the nitrogen compound cleaves to generate gaseous ammonia which foams the carbon residue. This carbon foam thus formed prevents the penetration of air and oxygen thereby inhibiting the formation of flames.

 Component A of the composition according to the invention may also contain mineral fillers and additives.

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* Mineral fillers
As mineral fillers, it is possible to use carbonates, in particular calcium carbonates, silicas; aluminas, especially alumina trihydrates and boehmite; titanium and magnesium oxides; talcum; micas; magnesium hydroxide; barium sulfate; ores based on zinc and tin; boron oxides as well as aluminum nitrides, vermiculites, clays.

As examples of mineral fillers that are suitable for the purposes of the invention, mention may be made in particular of: alumina trihydrates marketed by OMYA under the trade names MARTINAL ON 320 or MARTINAL OL 104; alumina sold by the company QUARRECHIM under the trade name "alumina MA 65"; silica "E 400" marketed by the company DOUSSELIN
GEOFFRAY JACQUET.

* Additives
Finally, component A of the composition according to the invention may also contain one or more additives commonly used in the field of paints and varnishes, such as in particular dispersing agents, thickening agents, wetting agents, anti-foam agents. , thinners, anti-sedimentation agents, stabilizers, release agents, diluents, antioxidants, plasticizers, flame retardants, dyes, pigments and polyurethane-forming catalysts, such as amines and metal salts, for example tin or mercury salts, desiccants.

As examples of additives that can be used according to the invention, mention may be made in particular of: - the molecular sieve marketed by GRACE Davison under the trade name "SYLOSIV A3". Such a molecular sieve is suitable as a desiccant; the antifoaming agent marketed by BYK Chemie,
Germany under the name "BYK 141"; the polyurethane-forming catalyst marketed under the trade name "DABCO 33LV" by the company AIR

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PRODUCTS or that marketed under the name "Tinstabs BL 277" by AKCROS or the catalyst marketed under the name "THORCAT 535" by the
THOR Company; the hydroxylated resin "PH3-a / 15" marketed by the Company
VFT; - the thickening agent "AEROSIL COK 84" marketed by the
DEGUSSA company; the antioxidant "IRGANOX 1520 D" marketed by the Company
CIBA; - the dye "ASTRAPLAST BLACK AGH 377" marketed by the
ASTRA dispersion company; the additive "DISFLAMOLL TOF" marketed by the Company
BAYER.

Component B
Component B of the fire-resistant composition according to the invention is a polyisocyanate having a functionality equal to or greater than 2 and a Brookfield viscosity measured at 25 ° C between 20 mPa.s and 45,000 mPa.s, preferably between 20 mPa.s and 10,000 mPa.s, more preferably between 20 mPa.s and 500 mPa.s.

 Suitable polyisocyanates for the purpose of the invention are polyisocyanates of aromatic nature based on methylenediphenyldiisocyanate (MDI) or prepolymers of MDI; aromatic polyisocyanates based on toluene diisocyanate (TDI); aliphatic polyisocyanates based on hexamethylenediisocyanate (HDI) or isophorone diisocyanate (IPDI).

 The above polyisocyanurate-modified polyisocyanates may also be used according to methods well known to those skilled in the art, for example by trimerizing the isocyanate with a tertiary amine.

By way of examples of suitable polyisocyanates for the purposes of the invention, mention may be made in particular of: - the isocyanate "BAYMIDUR K88" marketed by the Company
BAYER (Germany); the isocyanate "Tolonate HDT" marketed by the Company
RHODIA (France);

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isophorone diisocyanate IPDI marketed by the Company
LYONDELL (Holland).

 The anti-fire composition according to the invention can adhere in a thick layer (because it is free of solvent) on supports as varied as metal beams or ceilings, doors, walls, glass fabrics, or any medium susceptible to be damaged by fire or excessive heat. It can also be poured into the protective sheaths of electrical cables.

 The thickness to be deposited depends on the level of risk or the desired or dictated performance of the law.

 Depending on the layout of the premises, the fire-resistant composition according to the invention can be cast or projected and can be used to produce electrical insulators which are also excellent thermal screens.

 According to a variant, the fire-resistant composition according to the invention is used to produce support coatings, such as glass fabrics or special fabrics, in particular, in the production of electrical insulators having thermal screen properties.

During the application of the fire-resistant composition according to the invention, there is almost instantaneous formation of a polyurethane which, unlike intumescent polyurethanes already known, is not a thermoplastic polyurethane, but a polyurethane similar to thermosetting polyurethanes. although it is obtained by mixing components A and B at room temperature
Under the effect of heat (fire, flame, etc.), the polyurethane thus formed swells and cokes forming a protective crust protecting the support from degradation, said polyurethane making an effective thermal barrier.

 The "anti-fire" composition according to the invention makes it possible to obtain excellent protection against fire. Indeed, the polyurethane resulting from the application of said composition on a material to be protected has excellent intumescent properties and very good thermal resistance. The electrical insulation properties are preserved despite the superficial charring.

 The intumescent properties of the polyurethane, obtained with the fire retardant composition according to the invention, were determined by the standard "self-extinguishing UL94" test well known to those skilled in the art and published by Underwriters Laboratories Inc.

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 The thermal resistance of the polyurethane is measured by the flame test on a plate of said polyurethane to be tested, said plate having the following dimensions 10 × 10 cm 2, thickness 12 or 4 mm.

 This test consists in exposing said plate to a flame of a "bunzen" nozzle fed with butane gas, at a distance of 3 cm, said plate being inclined at 45 with respect to the flame and for measuring the temperature of the cold wall (opposite wall to the flame) using a thermocouple (type K probe) after several minutes of exposure to the flame, for example 15 minutes.

 The polyurethane obtained with the anti-fire composition according to the invention also has good smoke test properties according to ASTM E662 or (NFX-702) as shown by the results reported in Table IV.

 The invention will now be described in more detail by the illustrative and nonlimiting examples hereinafter.

Example 1
Component A of an anti-fire composition according to the invention was prepared by adding to the mixture X below: - 20 parts by weight of BUDIT 3077 - 30 parts by weight of MARTINAL ON 320
Mixture X - 12.75 parts by weight of DESMOPHEN 1900 U (linear polyether-based polyol) - 30.25 parts by weight of ARCOL 1342 (polyoxypropylene / polyoxyethylene triol) - 4.5 parts by weight of 1, 4 butane diol - 2.35 parts by weight of molecular sieve SYLOSIV A3 - 0.1 parts by weight of antifoam BYK 141 - 0.05 parts by weight of DABCO 33LV catalyst
The Brookfield viscosity of component A was 16,500 mPa.s. at 25 C.

 Component B of said composition consisted of 18.5 parts by weight of the BAYMIDUR K 88 isocyanate whose Brookfield viscosity measured at 25 C is 90 mPa.s.

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 By blending components A and B above, Vo-grade polyurethane was obtained in the UL94 test.

Examples 2 to 7
Anti-fire compositions according to the invention were prepared by adding to the mixture X defined in Example 1, the ingredients indicated in the table here-after to form the component A whose Brookfield viscosity measured at 25 C is indicated in FIG. Table III. This component A was mixed with the component B defined in Example 1 and made it possible to obtain polyurethanes whose characteristics of self-extinguishing and fire resistance as well as the Shore hardness are those appearing in Table III.

Examples 8 to 11
In these examples, the constituents indicated in Table II were added to the mixture Y below in order to obtain the component A.

Y mixture - 18.7 parts by weight of polyBD modified polyol R45 (ATOCHEM) - 43 parts by weight of DYPOL 6862 (polyol based on polyether groups and DYFLEX ester) - 3.1 parts by weight of SYLOSIV A3 - 0.13 part by weight of BYK 141 - 0,07 parts by weight of DABCO 33LV
By mixing components A and B, polyurethanes having the characteristics shown in Table III were obtained.

Example 12
In this example, component A having the following composition was used: component A polyol: - 19 parts of polyol polyether base BAYGAL K55 (BAYER) - 5.27 parts of DESMOPHEN 1900 U linear hydroxyl polyether (BAYER)

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intumescent system: - 10 parts of EPON 828 (bisphenol A epoxide of SHELL) - 10.5 parts of FR CROS 484 mineral fillers: - 36 parts of MARTINAL ON320 - 15 parts of MARTINAL OL 104 additives: - 0.5 parts BYK 141 - 0.5 parts of BYK 920 (wetting and dispersing agent) - 3 parts of SYLOSIV A3 polyurethane forming catalyst: - 0.23 part of Tinstab BL 277 (AKCROS catalyst) component B - 28 parts in weight of the Rhodia "Tolonate HDT" isocyanate having a Brookfield viscosity at 25 C of 2,400 mPa.s
The polyurethane obtained by mixing component A with component B also has excellent characteristics of electrical insulation and heat shield.

Example 13
100 parts of Component A according to Example 12 were mixed with 20 parts of Component B consisting of BAYMIDUR K88 isocyanate (BAYER) and a polyurethane was obtained which also had excellent electrical insulation and heat shield properties. .

Example 14
100 parts by weight of component A of Example 12 were mixed with 28 parts of isophorone diisocyanate marketed by LYONDELL and whose Brookfield viscosity at 25 C was 13 mPas. A polyurethane having also excellent properties of electrical insulation and heat shield was obtained.

Example 15
100 parts of component A below with 13 parts of component B consisting of isocyanate BAYMIDUR K88 were used.

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 component A - 31.25 parts of polyBD modified polyol R45 - 5.4 parts of hydroxylated resin PH 3-a / 15 (VFT) - 4.6 parts of DPG (BRENNTAG) - 2.9 parts of DISFLAMOLL TOF (BAYER) - 0.5 parts of BYK 141 - 0.15 parts of AEROSIL COK 84 (DEGUSSA) - 0.15 part of IRGANOX 1520 D (CIBA) - 0.05 part of THORCAT 535 (THOR) - 0.9 part of ASTRAPLAST BLACK AGH 377 (ASTRA dispersion) - 9.7 parts of BUDIT 3077 - 9.7 parts of FR CROS 484 - 9.7 parts of MARTINAL OL 104 (OMYA) - 22.1 parts of MARTINAL ON320 (OMYA) - 2, 9 parts of SYLOSIV A3

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ap H

<tb> Composition <SEP> anti-fire <SEP> Example <SEP> 1 <SEP> Example <SEP> 2 <SEP> Example <SEP> 3 <SEP> Example <SEP> 4 <SEP> Example <SEP> 5 <SEP> Example <SEP> 6 <SEP> Example <SEP> 7
<tb> Component <SEP> A
<tb> 1) <SEP> Blend <SEP> X
<tb> DESMOPHEN <SEP> 1900 <SEP> U <SEP> 12.75 <SEP> parts <SEP> 12.75 <SEP> parts <SEP> 12.75 <SEP> parts <SEP> 12.75 <SEP > parts <SEP> 12,75 <SEP> parts <SEP> 12,75 <SEP> parts <SEP> 12,75 <SEP> parts
ARCOL SEP 1342 SEP 30.25 SEP parts SEP 30.25 SEP parts SEP 30.25 SEP parts SEP 30.25 SEP parts SEP > 30,25 <SEP> parts <SEP> 30,25 <SEP> parts <SEP> 30,25 <SEP> parts
<tb> 1,4 <SEP> butane <SEP> diol <SEP> 4,5 <SEP> parts <SEP> 4,5 <SEP> parts <SEP> 4,5 <SEP> parts <SEP> 4,5 <SEP> parts <SEP> 4,5 <SEP> parts <SEP> 4,5 <SEP> parts <SEP> 4,5 <SEP> parts
<tb> SYLOSIV <SEP> A3 <SEP> 2.35 <SEP> parts <SEP> 2.35 <SEP> parts <SEP> 2.35 <SEP> parts <SEP> 2.35 <SEP> parts <SEP > 2.35 <SEP> parts <SEP> 2.35 <SEP> parts <SEP> 2.35 <SEP> parts
<tb> BYK <SEP> 141 <SEP> 0.1 <SEP> part <SEP> 0.1 <SEP> part <SEP> 0.1 <SEP> part <SEP> 0.1 <SEP> part <SEP > 0,1 <SEP> part <SEP> 0,1 <SEP> part <SEP> 0,1 <SEP> part
<tb> DABCO <SEP> 33LV <SEP> 0.05 <SEP> part <SEP> 0.05 <SEP> part <SEP> 0.05 <SEP> part <SEP> 0.05 <SEP> part <SEP > 0.05 <SEP> part <SEP> 0.05 <SEP> part <SEP> 0.05 <SEP> part
<tb> 2) <SEP> Intumescent <SEP> System
<tb> BUD1T <SEP> 3077 <SEP> 20 <SEP> parts <SEP> 20 <SEP> parts <SEP> 20 <SEP> parts <SEP> 20 <SEP> parts
<tb> FR <SEP> CROS <SEP> 484- <SEP> - <SEP> 30 <SEP> parts <SEP> 22 <SEP> parts <SEP> 37,5 <SEP> parts
<tb> Pentaerythritol <SEP> - <SEP> - <SEP> - <SEP> 16 <SEP> parts- <SEP> 16,65 <SEP> parts
<tb> melamine <SEP> n <SEP> 3 <SEP> (DSM) - <SEP> - <SEP> - <SEP> 12 <SEP> parts- <SEP> 16,65 <SEP> parts
<tb> BUDITT315 <SEP> - <SEP> - <SEP> 12,5 <SEP> parts
<tb> BUD1TT313 <SEP> - <SEP> - <SEP> - <SEP> - <SEP> 16,70 <SEP> parts
<tb> 3) <SEP> Mineral fillers
<tb> Alumina <SEP> MA65 <SEP> 30 <SEP> parts
<tb> Silica <SEP> E400- <SEP> 30 <SEP> parts
<tb> MART1NAL <SEP> ON <SEP> 320 <SEP> 30 <SEP> parts <SEP> - <SEP> - <SEP> ~~~~~~~~~~~~~~
<tb> Component <SEP> B
<tb> Isocyanate <SEP> of <SEP> BAYMIDUR <SEP> K88 <SEP> 18.5 <SEP> parts <SEP> 18.5 <SEP> parts <SEP>#<SEP> 18.5 <SEP> parts <SEP> 18.5 <SEP> parts <SEP> 18.5 <SEP> parts <SEP>#<SEP> 185, <SEP> parts <SEP> 18.5 <SEP> parts
<Tb>

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ni ci H

neither ci H

<tb> Composition <SEP> anti-fire <SEP> Example <SEP> 8 <SEP> Example <SEP> 9 <SEP> Example <SEP> 10 <SEP> Example <SEP> 11
<tb> Component <SEP> A
<tb> 1) <SEP> Mix <SEP> Y
<tb> PolyBD <SEP> R45 <SEP> 18.7 <SEP> parts <SEP> 18.7 <SEP> parts <SEP> 18.7 <SEP> parts <SEP> 18.7 <SEP> parts
<tb> DYPOL <SEP> 6862 <SEP> 43 <SEP> parts <SEP> 43 <SEP> parts <SEP> 43 <SEP> parts <SEP> 43 <SEP> parts
<tb> SYLOSIV <SEP> A3 <SEP> 3.1 <SEP> parts <SEP> 3.1 <SEP> parts <SEP> 3.1 <SEP> parts <SEP> 3.1 <SEP> parts
<tb> BYK <SEP> 141 <SEP> 0.1 <SEP> 3 <SEP> part <SEP> 0.13 <SEP> part <SEP> 0.13 <SEP> part <SEP> 0.13 <SEP > part
<tb> DABCO <SEP> 33LV <SEP> 0.07 <SEP> part <SEP> 0.07 <SEP> part <SEP> 0.07 <SEP> part <SEP> 0.07 <SEP> part
<tb> 2) <SEP> Intumescent <SEP> System
<tb> BUD1TT <SEP> 3077 <SEP> 20 <SEP> parts <SEP> 20 <SEP> parts <SEP> 20 <SEP> parts <SEP> 20 <SEP> parts
<tb> FR <SEP> CROS <SEP> 484 <SEP> - <SEP> 15 <SEP> parts
<tb> 3) <SEP> Mineral fillers
<tb> Silica <SEP> E <SEP> 400 <SEP> 15 <SEP> parts
<tb> Alumina <SEP> MA65- <SEP> 15 <SEP> parts
<tb> MART1NAL <SEP> ON <SEP> 320 <SEP> 15 <SEP> parts <SEP> - <SEP> - <SEP> - <SEP>
<tb> Component <SEP> B
<tb> Isocyanate <SEP> 20 <SEP> parts <SEP> 20 <SEP> parts <SEP> 20 <SEP> parts <SEP> 20 <SEP> parts
<tb> BAYMIDUR <SEP> K88
<Tb>

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Table III

<tb> Self-extinguishing <SEP> UL <SEP> 94 <SEP> Thermal <SEP> Holding
<tb> Viscosity <SEP> Brookfield <SEP> T <SEP> Wall <SEP> Cold <SEP> After
<tb> Example <SEP> of the <SEP> component <SEP> A <SEP> to <SEP> 25 C <SEP> 15 <SEP> min <SEP> of Exposure
<tb> mPa.s <SEP> Hardness <SEP> Ranking <SEP> Ranking <SEP> Ranking <SEP> at <SEP> the <SEP> flame
<tb> Shore <SEP> D <SEP> 12 <SEP> mm <SEP> 6 <SEP> mm <SEP> 4 <SEP> mm <SEP> thickness <SEP> 12 <SEP> mm <SEP> thickness <SEP > 4 <SEP> mm
<tb> 1 <SEP> 16 <SEP> 500 <SEP> 46 <SEP> VO <SEP> VO <SEP> 170
<tb> 8 <SEP> 14 <SEP> 500 <SEP> 61 <SEP> VO <SEP> VI <SEP> 162
<tb> 2 <SEP> 12200 <SEP> 45 <SE> VO <SEP> V1 <SEP> 186
<tb> 9 <SEP> 15 <SEP> 600 <SEP> 43 <SEP> V2 <SEP> 168
<tb> 3 <SEP> 15 <SEP> 500 <SEP> 43 <SEP> VI <SEP> 194
<tb> 10 <SEP> 15 <SEP> 600 <SEP> 43 <SEP> V2 <SEP> 145
<tb> 4 <SEP> 16 <SEP> 700 <SEP> 47 <SEP> V0 <SEP> V0 <SEP> 114
<tb> 11 <SEP> 59 <SEP> V0 <SEP> 137
<tb> 5 <SEP> 37 <SEP> 000 <SEP> 45 <SEP> VO <SEP> 161
<tb> 6 <SEP> 15 <SEP> 000 <SEP> 45 <SEP> VO <SEP> 170
<tb> 7 <SEP> 40 <SEP> 000 <SEP> 52 <SEP> V0 <SEP> 155
<tb> 15 <SEP> 23 <SEP> 000 <SEP> 45 <SEP> V0 <SEP> 155
<Tb>

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Table IV Smoke test according to ASTM E662 (or NFX-702)

<Tb>
<tb> Reference <SEP> Density <SEP> max. <SEP> in <SEP> end <SEP> test <SEP> VOF4
<tb> 1 <SEP> 426 <SEP> 67
<tb> 2 <SEP> 681 <SEP> 21
<tb> 15 <SEP> 870 <SEP> 199
<tb> 14 <SEP> 616 <SEP> 149
<tb> 13 <SEP> 721 <SEP> 246
<tb> 12 <SEP> 440 <SEP> 51
<Tb>

Optical density measurement:
The tests are carried out at the NBS chamber
The specimen of dimensions (76 x 76 x 12) is subjected vertically to a thermal radiation in the presence of flame.

 A photometric device makes it possible to evaluate the obscuration caused by the emission of fumes.

 The duration of the test is 20 minutes.

Dma @: Maximum specific optical density
VOF4: Obscuration value after the first 4 minutes of testing.

Claims (5)

claims An anti-fire composition, characterized in that it comprises: 100 parts of a component A comprising: 15 to 80, preferably 35 to 50, parts by weight of at least one polyol having a higher average functionality at 2 and a viscosity Brookfield measured at 25 C below 10,000 mPa.s; - 5 to 80, preferably 15 to 50 parts by weight of an intumescent system; 0 to 60, preferably 10 to 40, parts by weight of mineral fillers; 0 to 10, preferably 0 to 5, parts by weight of additives; 10 to 60, preferably 15 to 30, parts by weight of a component B comprising at least one polyisocyanate having a functionality equal to or greater than 2 and a Brookfield viscosity measured at 25 C between 20 mPa.s and 45,000 mPa.s.  2. Anti-fire composition according to claim 1, characterized in that the intumescent system comprises: - 10 to 90 parts by weight, preferably 15 to 80 parts by weight of an acid catalyst; 0 to 45 parts by weight, preferably 0 to 20 parts by weight of a carbon compound; 5 to 75 parts by weight, preferably 25 to 65 parts by weight of a nitrogen compound.  3. Anti-fire composition according to one of claims 1 or 2, characterized in that the Brookfield viscosity of component A measured at 25 C is between 100 mPa.set 10.000 mPa.s.  4. Fireproof composition according to any one of claims 1 to 3, characterized in that the Brookfield viscosity of component B measured at 25 ° C is between 20 mPa.s and 10,000 mPa. s, preferably 20 to 500 mPa.s.  5. Electrical insulation having heat shielding properties, characterized in that it is obtained by mixing the components A and B of the fireproof composition according to any one of claims 1 to 4.