Fireproof polymer composition

FIELD: chemistry.

SUBSTANCE: invention concerns fireproof polymer composition and can be applied in tyre-making and rubber industries, particularly in parts of rubber-cord shells used in repair of sewage pipelines, interplant and main oil pipe lines, under continuous exposure to sparks during welding, to flame and open fire by ignition. The polymer composition includes chloroprene rubber nairite, sulfur, altax, stearine, diaphene FP, acetonanile R, chloroparaffin, antimony trioxide, dibutylphthalate, carbon black P-803, santogard PVI and combination of active fillers, in mass parts per 100 mass parts of rubber: zinc oxide - 3-8, magnesium oxide - 3-10, titanium oxide - 15-30, and carbon white CW-120 - 20-30.

EFFECT: increased fire resistance of polymer composition layer under continuous exposure of an article to sparks and open fire under pressure; technological compatibility with polymer compositions in manufacturing multilayer rubber-cord articles.

4 tbl

 

The invention relates to the rubber products industry, particularly to flame retardant polymer compositions used in parts rubber membranes used in the repair and accidents sewer pipelines, plant and pipelines, during prolonged exposure to sparks, flame and open fire.

Known polymer composition based on synthetic rubbers (see A.S. SU # 514867, publ. Bull. No. 19 of 25.05.76 g)containing as a flame retardant 0.5 to about 30.0 parts chlorprothixene of perchloromethane on 100 parts of rubber.

A disadvantage of known composition is a long decay after the burn-out segments in the polymer composition, high plasticity, impairing its storage and processing into products, high values of relative elongation for vulcanizates, which is unacceptable for the manufacture of rubber-cord composites.

Also known flame-retardant polymer composition (see N. Belozerov "rubber Technology", M.: Chemistry. - 1979, str-246)containing 100 parts by weight of chloroprene rubber to 5.0 parts by weight of chloroparaffin and 3.0 to 5.0 parts by weight of antimony trioxide.

The disadvantage of this known flame-retardant polymeric composition is a low resistance, resulting after exposure to fire formed burnt areas and prodoljitel the Noah residual burning surface, that can lead to loss of health products made from this resin composition.

Closest to the technical essence and the achieved technical result - prototype - is a polymeric composition for fire-resistant footwear firefighters (see EN No. 2001104408/12 from 13.02.2001, MCI AV 1/10, publ. Bull. No. 14 dated 20.05.2003,), including chain rubber, vulcanizing system, a filler and a flame retardant consisting of combinations of chloroparaffin trioxide and antimony, wherein the flame retardant composition further comprises a mineral remasterise compounds and aluminum hydroxide in the ratio of 1:(4÷10) in the following number of mixture components, parts by weight:

Chain rubber -100
Vulcanizing system8-10
Filler30-50
Chloroparaffin CP-110010-15
Antimony trioxide4-6
Track90-120

The disadvantage of the prototype is the inability to use polymeric composition in the rubber product, the operation of which after prolonged exposure to sparks and open flame, for example, when welding, surface burning which are of different lengths and depths of stations, that can lead to failure of the product under pressure, as well as in the technological process in the Assembly of multilayer rubber products, layers which contain different ingredients and in the future is incompatible with the cured polymeric composition.

So, it will be impossible to make a rubber membrane due to the incompatibility of the components contained in the polymer compositions of the coating layer and put over fire-resistant layer of the known polymeric composition.

The task of the invention is to eliminate these drawbacks, the development of composition a flame-retardant resin composition, the technical result which will increase resistance to burning portions of the layer of polymeric compositions with prolonged exposure to sparks and open fire on the product is operated under pressure, and maintenance of technological processes of duplication, gluing, Assembly and vulcanization with different composition of the polymer compositions in the manufacture of multilayer rubber products.

This technical result is achieved due to the fact that the polymer composition, comprising chloroprene rubber - Nairit, sulfur, altax, stearin, deafen OP, acetonyl R, dibutyl phthalate, carbon black P-803, santogard PVI, chlorine is arafin, antimony trioxide, additionally contains a combination of active fillers include zinc oxide of 3.0 to 8.0 parts by weight, magnesium oxide and 3.0 to 10.0 parts by weight, the titanium oxide 15,0 by 30.0 parts by weight of white carbon black BS-120 20,0-30,0 parts by weight, which achieves the necessary synergies to improve the fire resistance with prolonged exposure to sparks and open flame and technology of rubber-cord products from various components of the polymer compositions.

This Acetonyl R - polymerized 2,2,4-trimethyl 1,2-dihydroquinoline - yellow-brown powder, with a melting point ≥114°and Deafen OP - N-phenyl-N′-isopropyl-n-phenylenediamine - brown-grey crystalline powder, with a melting point ≥ 70°are the most effective antiozonants, protects rubber from heat and atmospheric aging.

As moderator of podocarpaceae selected Santogard PVI - N-cyclohexylthiophthalimide powder light gray color.

All the components of the flame retardant polymer compositions are produced by the chemical industry in accordance with the requirements of the state standards.

With the introduction and increase in the content of up to 40 vol.% in the polymer composition of the proposed combination of active fillers decreases the content of the rubber and creates a synergistic effect of the combination of Agnes is Onesti and the necessary technological and mechanical properties of the polymeric composition, which leads to the increase of fire resistance, shortening the period of self-extinguishing by reducing the weight of the rubber, increasing the volume of the polymer composition and its thermal conductivity, resulting absorbed a portion of thermal energy and slows down the formation of combustible gases, increases the mechanical strength and hardness at the following ratio of components, parts by weight:

Chloroprene rubber - Nairit100
Sulfurof 0.3-0.9
Alltex0,5-1,0
Stearin1,0-4,0
Deafen AF1,0-3,0
Acetonyl P1,0-3,0
Chloroparaffin10,0-15,0
Antimony trioxide15,0-25,0
Dibutyl7,0-25,0
Santogard PVI0,1-0,5
Carbon black P-80320,0-60,0
Zinc oxide3,0-8,0
Magnesium oxide3,0-10,0
The titanium oxide15,0-30,0
White carbon black BS-12020,0-30,0

In addition, ensure technological compatibility when assembling and vulcanizing the layer of flame retardant polymeric compositions with layers of half the dimensional compositions, contained in the design of manufactured products.

Flame retardant polymer composition is made in a standard way in a rubber mixer in two stages.

Example

First main ingredients: rubber, stearin, deafen OP, acetonyl R, white carbon, magnesium oxide, titanium oxide and antimony trioxide is introduced into the rubber mixer and stirred for 2 minutes, then load chloroparaffin, dibutyl phthalate and carbon black P-803 and stirred for 4 minutes. In the first stage of the composition add zinc oxide, sulfur and altax, santogard PVI stirred for 1.5 minutes and after manufacturing unloaded at a temperature of 75±5°C.

For testing manufactured compositions of the control and offer fire retardant polymeric composition, differing proportion of the components.

The composition of the control and offer fire retardant polymeric composition

Table 1
IngredientsContents parts by weight per 100 parts by weight of rubber
Control1234
Chloroprene rubber - Nairit100100100100100
Sulfur 1,00,30,50,80,9
Alltex-1,00,80,60,5
Stearin2,01,03,00,60,6
Deafen AF1,01,02,03,02,0
Acetonyl P-1,02,03,02,0
Dibutyl15,07,015,025,020,0
Santogard PVI-0,10,30,50,5
Chloroparaffin5,010,013,015,010,0
Antimony trioxide5,015,020,025,020,0
Carbon black P-80340,020,040,060,040,0
Zinc oxide-3,05,08,05,0
Magnesium oxide-3,06,010,07,0
The titanium oxide-15,025,030,020,0
White carbon black BS-120-20,025,030,020,0

For comparison tested the control and offer flame-retardant polymer composition.

The results of the tests are presented in tables 2 and 3.

Table 2
IndicatorsPolymer composition
Control1234
Plasticity0,590,410,430,450,45
Modulus at 300% elongation, MPa4,86,86a 9.0911,5a 12.7
Conditional tensile strength, MPa11,413,5413,514,8a 12.7
Elongation at break, %750680480360580
Relative residual deformation after the break, %302071117
Hardness shore, the river. units5561616562
Ball rebound resilience, %3940383438

For testing the bond strength between the layers taken the rubber mixture for the top layer of the following composition, parts by weight:

Rubber SKI-370,0
Rubber SKD30,0
Sulfur2,0
Sulfenamid M0,8
Zinc oxide5,0
Stearic acid2,0
Rosin2,0
Technical carbon 35430,0
Carbon P 51420,0

Test results

Table 3
IndicatorsPolymer composition
Control1234
The bonding strength between the surface layer and the flame-retardant layer, kN/m5,69,5the 9.711,the 10,8

Are shown in tables 2 and 3 these estimates plastoelastic properties of the vulcanizates show that the proposed flame-retardant polymer composition provides the necessary complex of physical-mechanical and technological compatibility with the polymer compositions of the layers included in the design details.

The resistance is determined by the time of combustion of the sample polymer composition with 10.0×to 2.5×see 0,2

The sample stand in the flame of an alcohol burner with a flame temperature of 900-1000°and remove from it.

The time of combustion and combustion after removal of the sample from the burner flame is detected by the stopwatch and the length of the burnt plot line.

Fireproof performance is the average of 10 samples of the control and 4 of the proposed polymer composition are shown in table 4.

Table 4
IndicatorsPolymer composition
Control1234
The burning time, sec93243
Time decay, in seconds102132/td>
The length of the burnt area, cm1,20,20,20,30,3

The use of the proposed fire retardant polymeric composition in a multilayer rubber products will increase the resistance with prolonged exposure to sparks and open flame and to improve the technology of Assembly and vulcanization of these products.

Flame retardant polymer composition comprising a chloroprene rubber-Nairit, sulfur, altax, stearin, deafen OP, acetonyl P, chloroparaffin, antimony trioxide, dibutyl phthalate, santogard PVI, carbon black P-803, characterized in that it further contains a combination of active filler is zinc oxide, magnesium oxide, titanium oxide, white carbon black BS-120 in the following ratio of components, parts by weight:

chloroprene rubber-Nairit100
sulfurof 0.3-0.9
alltex0,5-1,0
stearin1,0-4,0
deafen AF1,0-3,0
acetonyl P1,0-3,0
chloroparaffin10,0-15,0
antimony trioxide15,0-25,0
dibutyl7,0-25,0
santogard PVI 0,1-0,5
carbon black P-80320,0-60,0
zinc oxide3,0-8,0
magnesium oxide3,0-10,0
the titanium oxide15,0-30,0
white carbon black BS-12020,0-30,0



 

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