Polymeric heat-reflecting coating composition

FIELD: chemistry.

SUBSTANCE: invention relates to polymeric heat-reflecting coating compositions which are applied on inflatable structures, protective and rescue equipment (airstairs for civil aviation, floatation rafts, airships, pneumatic tents, heat-reflecting screens, shields for firefighters), consisting of airtight elastic material based on fabric (capron, nylon, lavsan, high-strength aramid fibre SVM). The polymeric heat-reflecting coating composition contains urethane rubber, a hardener, aluminium paste and ethyl acetate.

EFFECT: production of cold-curable polymeric heat-reflecting coating composition, having high resistance to thermal radiation (up to 29 kW/m2) and minimum weight gain (thickness).

3 tbl

 

The invention relates to polymeric heat-reflective compositions for coatings that are applied to inflatable structures, protective and rescue equipment (ladders civil aircraft, rafts, airships, inflatable hangars, heat-reflecting screens, shields for firefighters), consisting of an airtight elastic material based fabrics (rayon, nylon, polyester, high strength aramid fiber RAS).

Known polymer composition for coating comprising in parts by weight:

polyacrylate - 100;

Aerosil - 3,0-5,0;

the hydrate of aluminum oxide - 3,0-10,0;

hardener - 2,0-5,0.

As the hardener used methyltriacetoxysilane and/or ethyltriethoxysilane with the addition of tin. The composition is applied to the tissue from highly durable fibers for the manufacture of fire-resistant material. The drying temperature of the coating 170-220°C (RF patent No. 2210648).

The lack of a composition for coating is a large gain from coverage (more than 55 g/m2), as well as high-temperature drying of the coating, which is unacceptable for large-scale structures.

Known fluoropolymer composition for heat-reflecting coating curing at room temperature for no more than 24 hours, containing the product of the graft modification of fluorocarbon polymer and a crosslinking agent (U.S. patent No. 3.048.261).

A disadvantage of known composition is low and gesia to tanaleon materials impregnated based urethane rubbers.

Known teplootrazhayuschy epoxy composition for coating, a modified polyacrylate copolymer. As the filler used hollow glass microspheres (patent PRC No. 1434063).

The disadvantage of this composition is that it is not recommended to protect kanalizacija material from heat exposure and has a gain of more than 100 g/m2.

The closest adopted for the prototype, is a polymeric composition for heat-reflecting coatings on the outer side of the flexible fabric aircraft rescue ladder, inclusive, parts by weight: urethane rubber is 50, isocyanate - 4,5, plastimedical - 50, aluminum filler - 37.5 and solvent - 185 (U.S. patent No. 5.542.629).

The filler used aluminum powder.

As solvent - Thinner With 25/90 s

As a hardener - isocyanat brand ISOCYANATE 0626.

The disadvantages of the prototype is that the heat-reflecting coating has a low resistance to thermal radiation: when the power of the heat flow is not more than 2.0 Btu/ft2/sec (17 kW/m2after 15 minutes the color of the heat-reflecting coating is changed to brown, indicating a significant change in the reflection characteristics and gain from the heat-reflecting coating is 110 g/m2.

Technical task from which retene is the creation of a polymer composition for heat-reflecting coating of cold hardening, high resistance to thermal radiation (up to 29 kW/m2and minimum weight (thickness).

To achieve the technical objectives of the proposed polymer composition for heat-reflecting coating comprising a urethane rubber, a curing agent, an aluminum filler and a solvent, characterized in that as the curing agent contains a mixture of diphenylmethanediisocyanate and MDI as aluminum filler - aluminum paste, the solvent is ethyl acetate, in the following ratio of components, parts by weight:

urethane rubber12-25
the hardener1,3-3,0
aluminum filler8,4-20,1
the ethyl acetate155-375

As a hardener urethane rubber is used a mixture of diphenyl-mechanisation and MDI with a ratio of (50-60)÷(40-50) (TU 113-03-38-106-90), which gives high adhesion of the coating to tanaleon materials impregnated based urethane rubbers.

As aluminum filler used aluminum paste for teplootrazhayuschy the x coatings (TU 1-595-15-1143) with the reflection coefficient R s(in the range of 0.3-2.4 μm) of not less than 0,80 and gloss of not less than 80 services. units with gloss Picogloss 560 (angle measuring 60°), and PPV (coverage water) of 1.3-1.8 m2/g, high reflective characteristics which provide high resistance to thermal radiation effect.

As the organic solvent used in ethyl acetate (GOST 8981)having a surface tension of >24 MKN/m and, unlike other solvents, providing 100%uspevaemosti aluminum paste.

Examples of implementation

Example 1

In a mixer to prepare a 25%solution of urethane rubber SKU-8A (TU 38.103.209) with a molecular mass of 16000-18000: to 25 parts by weight of rubber added 75 parts by weight of ethyl acetate and working stirrer and a temperature of 60°C and reduce the mixture until complete dissolution.

Polymer teplootrazhayuschy composition prepared immediately before coating. To 100 parts by weight of a 25%solution of urethane rubber and 2.5 parts by weight of hardener added 29 parts by weight of aluminum paste (60%conc. in white-spirit according to GOST 3134) and 100 parts by weight of ethyl acetate. The mixture was thoroughly stirred. On the surface of the mixture should form a continuous mirror film.

Examples 2-4 are prepared analogously to example 1.

In examples 5, 6 used urethane rubber SKU-8TB (TU 38.103.468) with a molecular mass of 28000-32000.

The amount of aluminum pass the s is calculated from the ratio of urethane rubber to the aluminum paste 1,0: 0,7 (examples 1, 4, 5); 1,0: 0,6 (example 2); 1,0: 0,8 (examples 3, 6).

Example 7 (prototype). The composition comprises, in parts by weight: urethane rubber 50, isocyanate - 4.5, platesamenities - 50, aluminum filler - 37.5 and solvent - 185.

Heat-reflecting the composition can be applied onto the surface of kanalizacnych materials consisting of high-strength aramid fiber RAS (TU 17 0001040-6-105), nylon art. 8482-05 (TU 8378-036-0032-1069), Dacron art. 56 408 (TU 8378-043-00321069) with double-sided coating of urethane rubber (TU 38.103.209). Method of applying a heat-reflecting coating - spreminjanje (examples 1, 2, 3, 5, 6) or powder (example 4). The curing heat-reflecting coating is at a temperature of 20±2°C for 3-4 hours.

Table 1 shows the formulations of the composition and prototype, in table 2 - properties of the proposed composition and prototype table 3 - efficacy of polymeric heat-reflective compositions on various kanalizacnych materials.

Table 3
The efficacy of a polymeric heat-reflective compositions on various kanalizacnych materials
Kanalizaciyi material on fabricthe placeholder
The adhesion points (ex./after exposure to SW. water for 10 days) standard 15140-78The aramid1/1
Nylon1/3
Dacron1/1
Nylon-1/1
Duration of preservation of excessive pressure 200 KPa under the influence of external
heat flow: 17 kW/m2RAS20 sec
29 kW/m2CBM + composition 1at least 30 mincomplete loss of integrity
17 kW/m2Nylon10 sec
17 kW/m2 Nylon + composition 1no less than 15 min
17 kW/m2Dacron5 sec
17 kW/m2Dacron + composition 110 min
17 kW/m2Nylon coated (aluminium powder)10 min
(15 min - brown spots)

As follows from the results presented in tables 1, 2 and 3, the polymer composition for heat-reflecting coatings based on polyurethane rubber with a molecular mass of 16000-18000 and aluminum paste deposited on kanalizaciyi material with a weight gain of not more than 30 g/m2, provides significantly more duration (at least 30 min) save the excess pressure inflatable structures under the influence of external heat flux significantly greater intensity of radiation (up to 29 kW/m2)than known heat-reflective composition deposited on kanalizaciyi material with a gain of more than 100 g/m2

Polymer composition for heat-reflecting coating comprising a urethane rubber, a curing agent, an aluminum filler and a solvent, characterized in that as the curing agent contains a mixture of diphenylmethanediisocyanate and MDI as aluminum filler - aluminum paste, the solvent is ethyl acetate in the following ratio of components, parts by weight:

urethane rubber12-25
the hardener1,3-3,0
aluminum paste8,4-20,1
the ethyl acetate155-375



 

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17 cl, 5 ex, 5 tbl

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1 tbl

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19 cl, 4 dwg, 2 ex

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22 cl, 18 ex, 6 tbl

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EFFECT: increased rupture strength and reduced light loss.

2 cl, 1 tbl, 8 ex

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