Thermostabilising one-time use material
SUBSTANCE: invention relates to materials used for making thermal protection elements of electronic apparatus during prolonged exposure to heat. The thermostabilising material for one-time use in form of water-absorbing fabric contains the following in wt %: an active component with endorthermic effect - 1.5-3.0 aqueous polyacrylamide solution and 4.0-7.0 water absorbing fabric and a structuring component - 38-45 hemihydrate of calcium sulphate.
EFFECT: use of the invention enables to keep the temperature of a component of electronic apparatus at up to 150°C for a long time when exposed to a low-temperature flame.
2 tbl, 3 ex
The invention relates to materials used to create thermal protection of items of electronic equipment, and can be used in electronic engineering for thermal protection with long-term termoustoychivee.
Known heat storage material one-time actions (A.S. 1717614, bull. No. 9, 07.03.1992 g) on the basis of a substance with an endothermic effect decomposition of polyformaldehyde and a polymeric binder of epoxy resin.
The disadvantage of this material is rapid decomposition with emission of toxic substances and the decomposition of the binder.
Closest to the present invention is a material for RF patent No. 2141368, bull. No. 32, 20.11.99 consisting of a polymeric binder is epoxy resin and as active substances crystalline - potassium or alimohammadian alum.
The disadvantage of this material is that the active component of alum - crystallization water contained in a small amount. The result is a reduction of the endothermic effect of the material and decrease the duration of the maintenance mode tests.
The technical result of the invention is to provide a " oven " material providing for a long time maintain temperatures up to 150°C item of electronic equipment, such as a memory module Bo is starting the flight data recorder from heat exposure low temperature (260°C) flame.
The technical result is achieved by the fact that in the " oven " of material one-time actions, including the active ingredient with an endothermic effect and structuring component, as an active ingredient with an endothermic effect contains an aqueous solution of polyacrylamide, water-absorbing fabric, and as a structural component - aquatic calcium sulfate in the following ratio of components, wt.%:
|Semi-aquatic calcium sulfate||38-45|
|Water||the rest of it.|
It was established experimentally that the use as a structural component semi-aquatic calcium sulphate, when interacting with the water rolling in two-water, polyacrylamide and absorption fabric, creating resistant to heat a structure that provides long maintain temperatures up to 150°C electronic module placed in the proposed thermostatic material, when exposed to low temperature (260°C) flame due to the slow evaporation of water.<> Thus, the set of essential features set forth in the claims, allows to achieve the desired technical result.
Table 1 presents the physico-chemical characteristics of the material components of a single action.
|The name of the substance||Melting point, °C||The temperature of dehydration, °C||thermal effect of dehydration, j/g||The influence of temperature|
|Semi-aquatic calcium sulfate (gypsum plaster, alabaster) CaSO4·0,5H2O||200||132||Sustainable structure|
|Water is H2O||0||100||2440||-|
|Two-water calcium sulfate (gypsum) CaSO4·2H2O||128||345||Sustainable structure|
|Polyacrylamide, amid high is th acid, dry white transparent amorphous powder, density 1,302 g/cm3. Aqueous solution, 6% polyacrylamide has a jelly-like appearance, light yellow||190||100||2300|
|Water-absorbing fabric is polyacrylic Terry cloth, intensively absorbs water.|
"Oven " material one-time actions is prepared as follows:
Example 1. To prepare 100 wt.% material on technical scales weigh semi-aquatic calcium sulfate in the amount of 38 wt.%, 7 wt.% water-absorbing fabric and 55 wt.% polyacrylamide gel containing a 53.5 wt.% water and 1.5 wt.% polyacrylamide. Then mix the calcium sulfate and polyacrylamide-gel to form a homogeneous mixture. Then the mixture is impregnated with the water-absorbing fabric. In the middle of the obtained material is put the memory module and thermocouple as a temperature sensor and load in a heat resistant container.
Example 2. To prepare 100 wt.% material on technical scales weigh semi-aquatic calcium sulfate in the amount of 42 wt.%, 6 wt.% water-absorbing fabric and 52 wt.% polyacrylamide gel containing 50 wt.% water and 2 wt.% polyacrylamide. Then mix the calcium sulfate and poly is Grilamid-gel to form a homogeneous mixture. Then the mixture is impregnated with the water-absorbing fabric. In the middle of the obtained material is put the memory module and thermocouple as a temperature sensor and load in a heat resistant container.
Example 3. To prepare 100 wt.% material on technical scales weigh semi-aquatic calcium sulfate in the amount of 45 wt.%, 4 wt.% water-absorbing fabric and 51 wt.% polyacrylamide gel containing 48 wt.% water and 3 wt.% polyacrylamide. Then mix the calcium sulfate and polyacrylamide-gel to form a homogeneous mixture. Then the mixture is impregnated with the water-absorbing fabric. In the middle of the obtained material is put the memory module and thermocouple as a temperature sensor and load in a heat resistant container.
The test results are given in table 2.
Determination of thermal effects
Determination of thermal effects was conducted on the instrument Derivatograph company Paulik and Erdei comparison areas, limited by the curve of the differential thermocouple for sample and standard. As a reference was taken sodium bicarbonate, thermal effect which is equal to 765 j/,
Determination of thermal stability of materials
Determination of thermal stability was carried out by placing samples in a thermostat at a temperature of 260°C. the Temperature was controlled HA thermocouple as of the date the ICA and recorder N 307/1.
From table 2 it follows that the sample No. 2 is optimal: the number of semi-aquatic calcium sulphate and tissue enough to have formed a stable structure of the sample, and at the same time it contains a sufficient amount of the active component water. In sample No. 1, a large number of active components - water, providing a large thermal effect decomposition, however, few semi-aquatic calcium sulphate and rapid evaporation of water, so less time for thermal stabilization. In the sample No. 3 semi-aquatic calcium sulphate enough to form a stable structure, but the number of the active component - water is less than optimal, so less time tests.
|№ p/p||The composition, in wt.%||The endothermic effect, j/g||Time, hours and minutes||The condition of the sample after testing|
|1||Semi-aquatic calcium sulfate||38||1650||3 h 20 min||Sustainable Fort is and|
|2||Semi-aquatic calcium sulfate||42||1600||4 h 05 min||Stable form|
|3||Semi-aquatic calcium sulfate||45||1450||3 h 30 min||Stable form|
"Oven " material one-time action for the protection of items of electronic equipment, made of water-absorbing fabric, which is applied to the polyacrylamide gel in the form of an aqueous solution of polyacrylamide as an active ingredient with an endothermic effect and semi-aquatic Sul is at calcium as a structural component in the following ratio of components,
wt.% in the calculation for the whole material:
|Semi-aquatic calcium sulfate||38-45|
SUBSTANCE: invention relates to production of single action thermostabilising material which contains water as an active component with endothermic effect, polyacrylic acid and clay as binder in the following ratio of components, wt %: clay 15-50; polyacrylic acid (PAA) 2-3; water - the rest; the top surface of the said thermostabilising material also contains successive layer of aerosil and sealing composition in the followin ratio, in mm: aerosil 0.2-1; sealing composition 0.4-1.
EFFECT: invention provides for prolonged maintenance of temperature of components of an electronic device from thermal effect of a low temperature (260°C) flame and prevents dehydration during prolonged storage.
5 ex, 2 tbl
SUBSTANCE: invention relates to single action thermostabilising material which consists of a mixture which contains calcium sulphate dihydrate as binder with endothermic effect of decomposition in form of semihydrate calcium sulphate and water with the following ratio of components in wt %: semihydrate calcium sulphate 29 to 41; water 14 to 21; crystalline hydrate - the rest; and layers of aluminium hydroxide and sealing compound deposited successively on the upper surface of the said mixture in the following ratio, in mm: aluminium hydroxide from 0.3 to 1.0; sealing compound from 0.4 to 1.0.
EFFECT: obtaining single action thermostabilising material which allows for prolonged retention of high temperature of a component of an electronic device, and prevention of dehydration during storage.
1 cl, 2 tbl, 5 ex
SUBSTANCE: thermostabilising material of one-time action is proposed, consisting of inner and outer layers in proportion 10:1 by weight. Inner layer contains malonic acid as an active component with decomposition endothermic effect, boric anhydride as catalyst, boron nitride, and ethylsilicate in proportion as follows, in wt %: malonic acid 80-85, boric anhydride 8-10, boron nitride 2-3, ethylsilicate the rest. Outer layer contains lithium carbonate and ethylsilicate, in proportion as follows, in wt %: lithium carbonate 80-85, ethylsilicate the rest.
EFFECT: widening of thermostabilisation range at expense of heat storage material, combining endothermic effect of melting and endothermic effect of decomposition.
1 cl, 3 tbl, 3 ex
FIELD: heat carrying materials.
SUBSTANCE: invention provides cold carrier based on propylene glycol solution, and additionally containing alkali metal halide (bromide or iodide) in concentration 1.0-2.8 mole/kg, content of components being the following: 8-35.4% propylene glycol, 14.2-31.7% alkali metal halide, and water - the balance.
EFFECT: reduced viscosity of cold carrier.
3 cl, 2 tbl, 2 ex
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
SUBSTANCE: invention relates to liquid siloxane rubber-based compositions for making fire-resistant materials. Disclosed is a composition based on liquid siloxane rubber for making fire-resistant material containing the following (pts. wt): low-molecular siloxane rubber (100), ethylsilicate-40 (10-20), oleic acid (7-9), and octa(p-bromophenyl) tetraazaporphyrinato-cobalt (0.5-1). The disclosed composition is stable during storage at room temperature for up to 17 days and enables to obtain material with fire-resistance of up to 65 seconds.
EFFECT: composition which is highly stable during storage at room temperature compared to existing compositions and which enables to obtain material with high fire-resistance.
1 cl, 1 tbl
SUBSTANCE: disclosed composition contains the following components in pts. wt: intercalated graphite 20-50, tricresyl phosphate 25-40, aluminium hydroxide 30-45, zinc borate 10-35, organobentonite 1.5-3.0, hardener 30-35, epoxide resin - 100.
EFFECT: improved weather- and water-resistant properties of the composition and coating with retention or improvement of fire-retardant properties.
3 cl, 7 ex, 1 tbl
SUBSTANCE: invention refers to constructional composites based on ultra-high molecular polyethylene (UHMPE), used in industrial production of fire-resistant multipurpose products with compaction method. Fire-resistant material contains powdered ultra-high molecular polyethylene of powder particle size 20-50 microns and molecular weight within 1.0 million to 25.0 million, and ammonium polyphosphate of powder particle size not exceeding 10 microns and degree of polymerisation not less than 1200. Material is made by stirring the mixed powdered UHMPE and ammonium polyphosphate in ratio as follows, wt %: ultra-high molecular polyethylene - 80, ammonium polyphosphate - 20.
EFFECT: produced fire-resistant material is characterised with fire resistance "ПВ"-0 and ensures reduced degree of flammability of constructional composites.
1 tbl, 1 ex
SUBSTANCE: present invention pertains to silicon compositions, methods of durable adhesion to textiles and provision for fire resistance. Proposal is given of versions of silicon compositions, containing at least, one polysiloxane or siloxane oligomer, functionalised as a result of introduction of at least, one amino group and, at least, three functional groups, capable of cross-linking, and (0.1-10) wt %, of an aluminium compound per silicon composition. Proposal is also given of versions of the method of processing a substrate, containing cellulose, of the proposed silicon composition, and a substrate containing substrate, processed by this composition.
EFFECT: wider assortment of such compositions.
16 cl, 1 tbl
SUBSTANCE: this invention refers to fireproofing of resin support when being coated with fireproofing substance. Described is fireproofing polymeric composition including (a) organic resin support and (b) fireproofing substance taken in amount within ca 5 to ca 35 wt % per polymeric substrate (a) and representing mixed (i) at least one melamine-based fireproofing substance and (ii) at least one fireproofing substance chosen from group including halogen-organic and phosphoprous-containing fireproofing substances.
EFFECT: production of composition with improved fireproof properties.
6 cl, 2 tbl, 24 ex
FIELD: storage of explosive and inflammable objects.
SUBSTANCE: the method consists in packing of the mentioned objects in containers, piling of the containers and storage of the piles in warehouses or in open areas, the piles are coated with a fireproofing material made of a flexible net of mineral fiber with a fireproofing composition on the basis of intercalated graphite applied onto it. The offered fireproofing composition contains chloroprene rubber, zinc borate, chlorinated paraffin, phenolformaldehyde resin, ammonium polyphosphate and intercalated graphite.
EFFECT: enhanced efficiency of protection from fires and explosions, provided a reserve of time for beginning of fire protection actions.
7 cl, 1 tbl
FIELD: fireproof textiles.
SUBSTANCE: invention relates to methods of chemically treating fibrous materials, in particular, imparting to textiles fireproof properties. Method comprises soaking textile in aqueous solution of polyacrylonitrile/phosphoric acid reaction product, wherein principal complexing moiety is α-aminoalkylidenediphosphonic compound, until content of the latter in textile achieves 50-73 wt %, after which textile is dried to its residual content 13-15%. Textile is then hardened with ammonia and held for 1 h. Hardened polymer is oxidized to convert trivalent phosphorus into pentavalent state and then washed and dried.
EFFECT: optimized technology of high-quality fireproof impregnation of materials.
FIELD: chemistry of polymers, chemical technology.
SUBSTANCE: invention relates to epoxyurethane resin-base polymeric composition. Composition comprises the following ratio of components, mas. p. p.: epoxyurethane resin, 100; aromatic amine hardening agent, 15-65; ammonium polyphosphate, 10-100, and filling agent, 10-170. Epoxyurethane resin is prepared by stirring at heating of epoxy component and polyisocyanate taken in the ratio from 85:15 to 98:2, at temperature 50-120°C for 50-210 min. As epoxy component invention uses a mixture of 4,4'-dioxydiphenylpropane-base epoxy resin of molecular mass 340-600 Da (A), technical polyepichlorohydrin diglycidyl ester (B) and technical laproxide representing oligomer of propylene oxide with terminal epoxide groups of molecular mass 250-900 Da (C). Components A:B:C are taken in the ratio from 5:70:25 to 90:5:5. As aromatic amine hardening agent the composition contains stabilized liquid mixture of aromatic amines. Invention provides decreasing viscosity and foam formation, enhancing working life and resistance to multiple thermal cycles from -60°C to +80°C and to obtain high strength indices. Proposed polymeric composition is used in making armor covers, enclosed charges of ballistic solid rocket fuel and as pouring compounds used in electronics, electric and radio engineering, building and for other aims.
EFFECT: valuable technical properties of composition.
4 tbl, 8 ex
FIELD: fire-resistant materials.
SUBSTANCE: invention relates to fabricating protective materials with fire-resistant coatings. Material is composed of woven base stock and hardened low-molecular weight siloxane rubber-based fire-protection coating applied thereon. Woven base stock is constituted by fabric made from capron, polyester, and cotton fibers at their weight ratio (30÷50):(20÷40):(20÷40), provided that warp is made from capron thread and weft is made from twisted cotton-polyester thread with number of twists per meter 200-500.
EFFECT: sixfold increased fire resistance of material in open flame.
1 tbl, 7 ex
FIELD: high-molecular compounds, in particular polymeric materials with reduced inflammability.
SUBSTANCE: claimed composition contains thermoplastic polymer and phosphorus-containing flame retardant system, more particularly, mixture of heat resistant ammonium salt of aminotrismethylenephosphonic acid, pentaerythritol and zeolite in mass ratio of (60-75):(39-24):(1-1.5), respectively, in mass ratio of thermoplastic polymer/flame retardant system of (70-90)-(30-20). As thermoplastic polymer composition may contain polystyrene or polypropylene or polyethylene terephthalate, wherein optimal mass ratio of polystyrene or polypropylene/flame retardant system is (70-80):(30-20), and mass ratio of polyethylene terephthalate/flame retardant system is (90-85):(10-15).
EFFECT: thermoplastic polymers with improved flame retardant properties; reduces toxic gas releasing.
4 cl, 4 tbl, 33 ex
FIELD: polymer materials.
SUBSTANCE: invention relates to incombustible, weakly foaming polybutylene terephthalate-based polymer composition, which can be used injection casting and extruding construction- and decorative construction-destination parts for motor cars, aircrafts, and other vehicles as well as in electrical engineering. Composition contains 79.5-91% polybutylene terephthalate, 4-10% decabromodiphenyl oxide or its mixture with antimony trioxide, 1-3% polytetrafluoroethylene, and additionally 4-15% modifier, in particular polyblock-structure block copolymer obtained by interaction of butanediol with oligotetramethylene oxide.
EFFECT: increased fire-resistant characteristics.
2 tbl, 5 ex
FIELD: production of fire resistant polyacrylonitrile textile fibers.
SUBSTANCE: claimed method includes continuous thermal treatment of continuous fiber in air media, exothermal heat discharge and pyrolysis product extraction. Continuous tows of 30-40 ktex in thickness with tows of 0.1-0.4 tex in length are heated in four steps: at 150-190°C; at 200-215°C, at 220-240°C, and 250-280°C while fiber draft is 5-30 %. Then fiber is formed to produce crimpiness of 3-7 crimps/cm. Continuous fiber may be cut on sections of 20-125 mm in length.
EFFECT: fire resistant fiber with high strength and elastic characteristics.
3 cl, 6 ex
FIELD: aerospace industry, mechanical engineering, ship building and construction industry.
SUBSTANCE: fire-fighting material has outer fibrous layer and layer, which swells upon emergency heating. According to one embodiment, fibrous layer is made in the form of knitted fabric of stretchable material manufactured from inorganic threads with melting temperature exceeding 1,150°C. According to another embodiment, fibrous layer is made from stretchable textile or knitted material manufactured from complex thread composed of inorganic filament and filament destructed under thermal action of temperature ranging between temperature value exceeding maximal admissible temperature, at which article to be protected is designed to operate, to temperature value of 1,050°C. These threads may be twisted, or readily destructed thread may be arranged along axis of complex thread and stretchable thread may be wound thereon. In both cases, swelling layer is applied to textile material fabricated from glass or basalt threads non-shrinkable at temperature of 450-1,050ºC and applied to article to be protected. Fire-fighting swelling material may be further provided with heat-insulating mat placed onto article to be protected, made from thermally stable glass or basalt filaments and provided with sheathing. Material has insignificant smoke release and may be applied onto flat and flexible articles of small diameter.
EFFECT: increased fire-fighting capacity and reduced fire penetration allowing articles to be effectively protected from emergency fire, and wide range of fields of application.
13 cl, 4 dwg, 2 tbl, 4 ex
FIELD: fire-proof foaming coats; protection of cable products against high-temperature effect.
SUBSTANCE: proposed compound contains dispersions of acryl polymers in water, thermo-expanding graphite, magnesium oxide, antimony (III) oxide, borates, phosphates, preserving and biocidal additives. Proposed compound has the following composition, parts by mass: thermo-expanding graphite, 10-30; magnesium oxide, 10-20; antimony (III) oxide, 5-10; borates, 5-10; phosphates, 10-35; dispersions of acryl polymers in water, 40-80; preserving and biocidal additives, 1-3.
EFFECT: enhanced fire resistance, elasticity, water resistance and adhesion of coat to different cable envelopes.
FIELD: fire retardant compositions and pastes, in particular for protection of electric cables, cable bunches, and cable lines.
SUBSTANCE: claimed composition contains (mass %): intercalated graphite 35.0-65.0; kaolin 0.5-3.0; aerosil 1.0-4.0; chloroparaffin 3.0-12.0; ammonium polyphosphate 1.0-4.0; and balance: chloroprene rubber. Claimed paste contains 30-50 % of abovementioned composition, and balance: solvent. Method for material production includes paste providing and application thereof on woven base preferably by spreading.
EFFECT: fire retardant compositions and pastes of high protective properties; material of increased strength, plasticity, weather resistance, foamability, and fire resistance.
14 cl, 3 ex, 1 tbl
FIELD: methods for production of fire-retardants for fireproofing treatment of wood materials, applicable in production of fireproof laminated products.
SUBSTANCE: the method is accomplished by interaction of carbamide-formaldehyde concentrate of the following composition, percent by mass: carbamide-21-25; formaldehyde - 54-60; water - the rest with ammonia liquor taken in equimolar relation in formaldehyde and ammonia, at heating in a weak-alkaline medium in the presence of amino alcohol added together with ammonia liquor (0.01-0.2 percent by mass) taking into consideration the carbamide-formaldehyde concentrate with a subsequent introduction of the first portion of carbamide (0.1-10 percent by mass) for 100 percent by mass of carbamide-formaldehyde concentrate, cooling, neutralization of the reaction mixture by ortho-phosphoric acid up to pH=6.0-8.0 and subsequent introduction of the second portion of carbamide (0.1-20 percent by mass), nonionogenic surface-active agent (0.01-0.1 percent by mass), potassium bichromate (0.1-1.5 percent by mass) for 100 percent by mass of carbamide-formaldehyde concentrate.
EFFECT: optimized conditions of synthesis of fire-retardants with preservation of their fireproofing efficiency at a high level.
2 ex, 1 tbl