Fireproof composition

FIELD: chemistry.

SUBSTANCE: composition includes, wt. p.: epoxy diane resin 100.0, hardener - polyethyleneamine 15.0, filler - cross-linked polyacrylamide POLYSWELL in form of granules, preliminarily swollen in water, in weight ratio 1:10 5.0-20.0.

EFFECT: increased fire resistance of composites based on epoxy diane resin.

2 tbl

 

The invention relates to the field of production of fire-resistant compositions based on polymeric binder and can be used for the production of parts and products in electrical, electronics and other industries.

Known flame-retardant composition containing epoxy Dianova resin, polyethylenepolyamine, low molecular weight polybutadiene rubber, trichlorethene, chloroparaffin, the chlorohydrin ether of tetrabromphenol, α-ferrocene and mineral filler (USSR Author's certificate 1543196, C08D L63/02; Publ. 1990).

However, the composition mnogokomponentnye, which complicates the process of cooking. Fireproof is the role of chlorine-containing compounds, which manifests itself in the gas phase. Thus, the formation of volatile halogenated toxic products.

Known flame-retardant composition comprising epoxy Dianova resin, the plasticizer is dibutyl phthalate, hardener - polyethylenepolyamine, filler - product of the interaction of magnesium hydroxide and dimethylphosphite, phosphorus (16,1-24,1%) (U.S. Pat. 2056444 Russia, C08L 63/02, C08K 13/02; Publ. 20.03.1996).

However, this composition is intended for processing of glass.

Closest to the invention by the technical nature of a flame retardant composition comprising epoxy Dianova resin, the plasticizer is dibutyl phthalate, hardener - polyethylenepolyamine, filler - product of the interaction of aluminum hydroxide and dimethylphosphite, phosphorus (6,4% and 19.4%). (U.S. Pat. 2056445 Russia, C08L 63/02, C08K 13/02; Publ. 20.03.1996).

However, this composition is intended for processing of glass.

Objective: to obtain a flame-retardant composition based on epoxy resin.

The technical result is to provide high resistance of the composition.

The technical result is achieved in that the flame-retardant composition for electric and electronic products containing epoxy Dianova resin, hardener - polyethylenepolyamine, filler, with composition as the filler contains cross-linked polyacrylamide POLYSWELL in the form of granules, pre-swollen in water in a mass ratio of 1:10, with the following ratio of components, wt.h.: epoxy Dianova resin - 100,0, polyethylenepolyamine - 15,0 specified filler - 5,0-20,0.

Epoxy Dianova resin brand ED-20 is the main binder in the composition (GOST 10587-84). The polyethylenepolyamine is a hardener of epoxy compositions (TU 6-02-594-75).

Cross-linked polyacrylamide POLYSWELL - granules of white, well-swelling in water, with a density of 0.8-1.0 g/cm3. Used to control lost circulation of drilling mud (http://www.globaldrillchem.com/products/index/polyacrylamide-lcm_3951.html).

In ka is este filler used cross-linked polyacrylamide POLYSWELL in the form of granules, pre-swollen in water in a mass ratio of 1:10.

To prepare the filling in a beaker load 1 mass.h. cross-linked polyacrylamide POLYSWELL in the form of granules and 10.0 mass.h. water, stirred until a homogeneous mass. Then aged at room temperature 23 °C for 20 minutes.

The presence of the filler - crosslinked polyacrylamide POLYSWELL water fireproof compositions based on epoxy Dianova resin. When exposed to a flame there is a kind of small explosions and injection of water into the flame zone, which leads to slower combustion by absorbing a significant amount of heat.

This composition allows to obtain composites based on epoxy Dianova resin with high resistance. Use 5-20 wt.h. filler is best. With the increasing content of the filler decreases the uniformity of the filler in the composition and increases the curing time, which creates technological difficulties in the manufacture of epoxy composite.

The use of lower filler content leads to decrease in resistance.

Fire-retardant composition is prepared as follows.

Epoxy Dianova resin and hardener - polyethylenepolyamine is loaded into the vessel and stirred for 5-10 minutes. Then is the introduction of crosslinked p is lucillia POLYSWELL, pre-swollen in water. Total cooking time is 20 minutes.

The invention is illustrated by the following example.

In a vessel containing epoxy Dianova resin and hardener - polyethylenepolyamine, introducing cross-linked polyacrylamide POLYSWELL, pre-swollen in water, and stirred the contents for 10-15 minutes until the mixture is homogeneous, we then conducted a curing composition for 24 hours at ambient temperature of 23 °C.

For the comparative tests was prepared 4 types of compositions (according to the method described in the example) and the composition of control example, formulations which are presented in table. 1.

The composition is a viscous liquid beige color.

Have been investigated by various content of cross-linked polyacrylamide POLYSWELL, pre-swollen in water. The research results are summarized in table 2.

The stated limits of cross-linked polyacrylamide is because when you increase these doses reduced the uniform distribution of the filler in the composition and increases the curing time, and when the reduction - reduces the resistance.

Comparative tests on all variants of the claimed compositions and example are given in table.2.

The proposed compositions were tested for Flammability in accordance with GOST 28157-89 method OC the NCI speed horizontal flame spread over the surface.

Water absorption was evaluated in accordance with GOST 4650-65.

The proposed compositions provide a significant increase in fire resistance and water resistance as compared with the control example. Thus, the linear speed of combustion of the test sample is 18 mm/min, and using the specified filler - 3 mm/min.

To determine the efficiency of the developed flame retardant compositions were tested by exposing the sample to a source of ignition. Installation for testing are collected on the basis of laboratory chemical tripod and installed in a well ventilated area. Samples for measurements have the following dimensions: diameter 50 mm, thickness 5 mm Prepared for the test sample is secured on the tripod vertically. Use universal gas Bunsen burner, equipped with a nozzle with a hole diameter of 7 mm Gas burner (using gas), which is in a horizontal position at a distance of not less than 200 mm from the sample, light and adjusted so that the height of the flame was 150-180 mm Flame send in the exact center of the fixed sample. Air supply adjust until then, until there is no longer a yellow tip flame.

Temperature measurements are performed by the device - pyrometer-300.3 (GOST 28243-96 "Thermometers. General technical requirements"). The principle of operation is isometry based on the power measurement of thermal radiation of the measurement object predominantly in the range of infrared radiation and visible light.

Using thermometer to register the temperature change on the unheated surface of the test sample over time until reaching the limiting state of the prototype. For the limit state of the material was taken the appearance of black spots on the unheated side of a prototype - loss of integrity of the material.

Table 1
ComponentTest caseThe content of the component masses.h., the composition of
1234
Epoxy Dianova resin100,0100,0100,0100,0100,0
The polyethylenepolyamine15,015,015,015,015,0
The specified filler-5,010,0 15,020,0

Table 2 shows that the proposed compositions are more resistance. For example, the time to reach the ultimate state of prototypes increases 2.5 times.

Table 2
TestThe indicator for the composition
Test case1234
The speed of horizontal flame spread, mm/min18,015,06,05,03,0
Water absorption, %0,410,330,240,280,28
The time to reach the ultimate state,15,035,050,050,050,0
Temperature neologismo the side of the substrate through 25, °CThe sample is destroyed33,028,024,020,0

Thus, the introduction into the composition of cross-linked polyacrylamide POLYSWELL in the form of granules, pre-swollen in water, provides a high resistance to fire.

Technical and economic effect obtained from the use of this composition, is that it enables to improve the fire resistance of epoxy composites.

Fire-resistant composition for electric and electronic products containing epoxy Dianova resin, hardener - polyethylenepolyamine, filler, characterized in that the composition as a filler contains cross-linked polyacrylamide POLYSWELL in the form of granules, pre-swollen in water in a mass ratio of 1:10, in the following ratio, wt.h.:
Epoxy Dianova resin - 100,0
The polyethylenepolyamine - 15,0
The specified filler - 5,0-20,0.



 

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