Fireproof rubber mixture

FIELD: chemistry.

SUBSTANCE: fireproof rubber mixture contains isoprene and butadiene rubbers, sulphur, sulphenamide C, zinc oxide, magnesium oxide, paraffin, naphtham-2, diaphene FP, technical carbon, N-nitrosodiphenylamine, chloroparaffin, antimony trioxide, aluminium hydroxide.

EFFECT: improved fire resistance and physical-mechanical properties.

2 tbl

 

The invention relates to fire-resistant rubber compound and can be used in the oil refining, mining and rubber industries.

Known rubber mixture based on ethylene-propylene rubber, including zinc oxide, organic peroxide, α,α'-bis-(tertBUTYLPEROXY)-1,4-diisopropylbenzene, stearic acid, paraffin, fire-retardant additive is alumina trihydrate, modified with 0.5-2.0 wt.% methacrylic acid, silicone additive - amoxicillin and sulfur. SU 1549975 IPC7C08L 23/16, SC 13/06, SC 21/14, SK 3:22, SC 5:01, SC 5:09, SK 5:14, SK 5:5419, SC 9:04, SC 13/06,15.03.1990.

The disadvantage of this rubber compound is not sufficiently high tensile strength and elongation.

Known rubber mixture based on the composition of butadiene (methyl) styrene rubber, polyvinyl chloride and modifying additives - 2,6-decret-butyl-4-methylaminoethanol or poly-(N-3,5-decret-butyl-4-oxytrol)ethylenimine, including vulcanizing agent, a metal oxide and an organic vulcanization activator. EN 2010814 IPC5C08L 9/06 SC 13/02, C08L 9/06, C08L 27:06, C08L 79:00, SC 13/02, SK 3:22, SC 5:18, 15.04.1994.

Closest to the technical essence is fire retardant polymer composition comprising a chloroprene rubber - Nairit, sulfur, altax, stearin, diaf is n AF, acetonyl P, chloroparaffin, antimony trioxide, dibutyl phthalate, carbon black P-803, santogard PVI and the combination of active fillers, parts by weight per 100 parts by weight of rubber - zinc oxide - 3-8, magnesium oxide - 3-10, titanium oxide - 15-30 and white soot BS-120 - 20-30. EN 2333226 IPC C08L 11/00, SC 13/02, SC 3/20, SC 3/22, SC 5/02, 10.09.2008.

The disadvantage of this rubber compound is not sufficiently high resistance, strength, elasticity on the rebound.

The objective of the invention is to provide a fire-resistant rubber compound with improved physical and mechanical properties that extend the range of this assignment.

The technical result is an improvement of physico-mechanical properties, namely, fire resistance, tensile strength, and elongation at break.

The technical result is achieved in that the flame-retardant rubber compound containing synthetic rubber, sulfur, deafen OP, chloroparaffin, antimony trioxide, carbon black, zinc oxide, magnesium oxide, according to the invention it further comprises sulfenamid, naphthas-2, paraffin, N-nitrosodiphenylamine, aluminum hydroxide, and as a synthetic rubber contains isoprene rubber SKI-3 and butadiene rubber SKD in the following ratios of the starting components in parts by weight:

Isoprene to ucuk SKI-3 80,0
Butadiene rubber SKD20,0
Sulfur2,3-2,8
Sulfenamid C1,3-1,8
Deafen AF0.5 to 1.5
Naphthas-20.5 to 1.5
Paraffin3,0-5,0
Carbon black P-32425,0-15,0
N-nitrosodiphenylamine0,8-1,2
Zinc oxide2,0-4,0
Magnesium oxide2,0-4,0
Chloroparaffin35,0-25,0
Antimony trioxide11,0-9,0
Aluminum hydroxide35,0-45,0

Distinctive features of the claimed invention are the above-mentioned additional components and their relation to already known. The ratio of new signs with known helps to improve the physico-mechanical characteristics of rubber, namely PR the durability tensile ball rebound resilience and resistance, which allows to expand the range of compositions for the production of rubber.

Example 1.

The rubber mixture is produced by mixing rubber SKI-3 and ACS with ingredients on a laboratory roll mill LB 320 150/150 for 30 minutes. The order of input of the ingredients was as follows:

1. The dissolution of the rubber SKI-3 and ACS for 8 min;

2. Input sulfenamide C, Naftna-2, N-nitrosodiphenylamine, zinc oxide, magnesium oxide, diafana OP for 3 min;

3. Enter paraffin, aluminum hydroxide, antimony trioxide for 7 min;

4. The input of carbon black P-324, chloroparaffin for 8 min;

5. Enter sulfur for 4 min;

6. Remove the sheet 2-2,5 mm

The cooled mixture was produced on the metal table.

Samples for the determination of physico-mechanical properties and fire resistance of a rubber compound was prepared according to the rubber industry standards.

80 wt. parts of isoprene rubber was added to 20.0 wt. parts of butadiene rubber, 0.5 wt. part of antioxidant (stabilizer) Naftna-2, 0.5. part of antioxidant (stabilizer) diafana OP, 0,8 wt. part of the vulcanization retarder N-nitrosodiphenylamine N-NDF, 3.0 mass. parts of paraffin plasticizer, to 25.0 wt. parts of filler carbon black P-324. As the vulcanizing system used 2.3 wt. the Asti vulcanizing agent is sulfur, 1.3 wt. parts of a vulcanization accelerator of sulfenamide C, 2.0 wt. parts of a vulcanization activator of zinc oxide and 2.0 wt. parts of a vulcanization activator of magnesium oxide. As flame retardants used 35.0 wt. parts of chloroparaffin (flame retardant-plasticizer), 11.0 wt. parts of antimony trioxide and to 35.0 wt. parts of aluminum hydroxide (flame retardant filler).

Fire and physico-mechanical properties of the rubber mixtures is given in table 2. The resistance was determined by the burning time of the standard samples after exposure for 20 seconds in the flame of the burner.

The compositions of the rubber mixtures is given in table 1.

To obtain a rubber compound used the following materials: isoprene rubber SKI-3 - GOST 14925-79, butadiene rubber SKD - GOST 14924-75; technical sulfur - GOST 127.1-93; sulfenamid C (N-cyclohexyl-2-benzothiazolylsulfenamide) - TU 6-14-868-72; zinc white (zinc oxide) - GOST 202-92; burnt magnesia technical (magnesium oxide) - GOST 844-73; naphthas-2 (phenyl-2-naphthalamine) - GOST 39-79; deafen OP (N-phenyl-N'-isopropylacetanilide) - TU 5-14-817-94; carbon technical - GOST 7885-86; paraffin - GOST 16960-71; N-NDF (N-nitrosodiphenylamine) - TU 6-14-907-88; antimony trioxide THAT 48-14-1-82; chloroparaffin CP-1100 - TU 6-01-597-9; aluminum Hydroxide mark "Scar-Years-315" TU 2322-007-50898710-2005 Manufacturer: OOO "NPF "Scar-Years" (195197. , St. Petersburg. Laboratory Ave, 23. office 19) Scar-Years-315, Al(OH)3- white powder (mass fraction of spherical particles with a size less than 20 μm is not less than 99%), can act as a fire retardant and as additive. the vast majority of demovideo due to the release of water of crystallization during thermal decomposition.

All these components are well known and are produced by the chemical industry in accordance with the requirements of the state standards.

Table 1
The rubber compound on the basis of butadiene-nitrile rubber with the use of flame retardants
ComponentsStructures
123 (prototype)
Isoprene rubber SKI-380,080,0-
Butadiene rubber SKD20,020,0-
Chloroprene rubber - Nairit--100
2,32,80,9
Sulfenamid C1,31,8-
Alltex--0,5
Stearin-0,6
Deafen AF0,51,52,0
Naphthas-20,51,5-
Acetonyl P--2,0
Paraffin3,05,0-
Dibutyl--20,0
Carbon black P-32425,015,0-
Carbon black P-83 --40,0
N-nitrosodiphenylamine0,81,2-
Santogard PVI--0,5
Zinc oxide2,04,05,0
Magnesium oxide2,04,07,0
Chloroparaffin35,025,010,0
Antimony trioxide11,09,020,0
Aluminum hydroxide35,045,0-
The titanium oxide--20,0
White carbon black BS-120--20,0

Table 2
The properties of the rubber compoundOptions
123 (prototype)
The tensile strength, MPa14,814,8a 12.7
Elongation at break, %480480580
Hardness shore, the river. units696962
Ball rebound resilience, %434338
Fire (the burning time of the sample)113

From table 2 it follows that the investigated variants rubber mixtures based on isoprene and butadiene rubbers have less time burning, i.e. higher resistance compared to the prototype, as well as high tensile strength, elasticity from the coke. Improvement of fire resistance occurs due to selection and optimization of the composition of the flame retardants, and the improvement of physico-mechanical properties by improving the homogenization of components and fillers in a matrix of rubber.

Fire-resistant rubber mixture containing synthetic rubber, sulfur, deafen OP, chloroparaffin, antimony trioxide, carbon black, zinc oxide, magnesium oxide, characterized in that it further comprises sulfenamid, naphthas-2, paraffin, N-nitrosodiphenylamine, aluminum hydroxide, and as a synthetic rubber contains isoprene rubber SKI-3 and butadiene rubber SKD in the following ratios of the starting components in parts by weight:

Isoprene rubber SKI-380,0
Butadiene rubber SKD20,0
Sulfur2,3-2,8
Sulfenamid C1,3-1,8
Deafen AF0.5 to 1.5
Naphthas-20.5 to 1.5
Paraffin3,0-5,0
Carbon black P-32425,0-15,0
N-nitrosodiphenylamine0,8-1,2
Zinc oxide2,0-4,0
Magnesium oxide2,0-4,0
Chloroparaffin35,0-25,0
Antimony trioxide11,0-9,0
Aluminum hydroxide35,0-45,0



 

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