Thermostabilising one-time use material

FIELD: chemistry.

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.%:

Polyacrylamide1,5-3,0
Water-absorbing cloth4,0-7,0
Semi-aquatic calcium sulfate38-45
Waterthe 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.

Table 1
The name of the substanceMelting point, °CThe temperature of dehydration, °Cthermal effect of dehydration, j/gThe influence of temperature
Semi-aquatic calcium sulfate (gypsum plaster, alabaster) CaSO4·0,5H2O200132Sustainable structure
Water is H2O01002440-
Two-water calcium sulfate (gypsum) CaSO4·2H2O128345Sustainable 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 yellow1901002300
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.

Table 2
№ p/pThe composition, in wt.%The endothermic effect, j/gTime, hours and minutesThe condition of the sample after testing
1Semi-aquatic calcium sulfate3816503 h 20 minSustainable Fort is and
Polyacrylamide-gel55
Water-absorbing cloth7
2Semi-aquatic calcium sulfate4216004 h 05 minStable form
Polyacrylamide-gel52
Water-absorbing cloth6
3Semi-aquatic calcium sulfate4514503 h 30 minStable form
Polyacrylamide-gel51
Water-absorbing cloth4

"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:

Water-absorbing cloth4,0-7,0
Polyacrylamide1,5-3,0
Semi-aquatic calcium sulfate38-45
Waterrest



 

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