Fire-resistant rubber mixture

FIELD: chemistry.

SUBSTANCE: invention relates to production of a fire-resistant rubber mixture and can be used in oil extraction, oil processing and mining industry. The rubber mixture contains the following ingredients, pts.wt (per 100.00 pts.wt rubber): butadiene-nitrile rubber - 100,00; thiuram D - 1.5; N,N'-dithiodimorpholine - 2.0; sulphenamide C - 2.0; naphtham-2 - 1.5; diaphene FP - 1.0; stearine - 1,0; colophony - 5.0; N-nitrosodiphenylamine - 1.0; chalk - 30.0; technical carbon P 701 - 55.0; technical carbon P 514 - 20.0; zinc oxide - 5.0; antimony trioxide - 4.0; chlorinated paraffin CP-1100 - 20.0; trichloroethylphosphate - 15.0; barium borate - 5.0.

EFFECT: obtaining a fire-resistant rubber mixture with high resistance to aggressive media and improved elasticity and strength properties.

2 tbl

 

The invention relates to the field of production of fire-resistant rubber compound and can be used in the oil, petrochemical and mining industry.

Known rubber mixture based on the composition of butadiene (methyl) styrene rubber, polyvinyl chloride and modifying additives - 2,6-decret-butyl-4-methylaminoethanol (I) or poly- (N-3,5-decret-butyl-4-oxytrol) ethylenimine, including vulcanizing agent, a metal oxide and an organic vulcanization activator (Patent RU №2010814 1994).

The disadvantage of this rubber are low rates of macrobertsons and uprugoopticheskii properties, not a high fire resistance.

Closest to the technical essence is a rubber mixture based on butadiene-nitrile rubber stamps BNKS-40 AM (AMS) -100,0, including mass, h: thiuram D - 1.5, N,N'-dithiodimorpholine - 2,0; sulfenamid "C" - 2,0; naphthas-2 - 1,5; deafen OP - 1,0; zinc white - 5,0, rosin - 5,0, chalk of MOR, MMS-1 - 30,0, carbon black P 701-55,0; carbon black P 514 - 20,0, dibutyl - 15,0 described in the patent RU No. 2232171 2002, which is the number of matching characteristics is selected as the closest analogue of the prototype of the proposed mixture. The vulcanizate of the rubber mixtures based on butadiene-nitrile rubber (BOC) are characterized by high is some resistance to various aggressive environments (oil, grease, oil). Because of these properties they are widely used for the manufacture of seals, gaskets, seals, sleeves, boots and other rubber products. However one of the major disadvantages of rubber is low resistance.

The objective of the invention is to increase the fire resistance of the rubber when exposed to sparks and open flame, the improvement of physical and mechanical properties with preservation of the resistance to aggressive media.

Technical results of the present invention to provide a fire-resistant rubber with high resistance to aggressive environments and high uprugoopticheskii properties.

This object is achieved by selection of flame retardants and optimization in a ratio of combustible ingredients in the rubber composition. The rubber mixture comprises, mass. including:

The NBR100,0
Thiuram D1,3-1,6
N,N'-dithiodimorpholine1,8-2,1
Sulfenamid C1,8-2,1
Naphthas-21,3-1,6
Deafen AF0,8-1,2
Stearin0,8-1,2
Rosin4,0-6,0
N-nitrosodiphenylamine0,5-1,0
Chalk20,0-30,0
Carbon black N 70145,0-55,0
Carbon P 51415,0-25,0
Zinc oxide3,0-5,0
Antimony trioxide3,0-5,0
Chloroparaffin CP-110017,0-22,0
Trichloroethylphosphate (TCHEPH)12,0-18,0
The barium borate4,0-6,0

The introduction of the ingredients above or below the limit values leads to deterioration of the output characteristics of rubber. What is new is the combination in a ratio of known flame retardants used in the rubber industry and the use of trichlorotriazine as a plasticizer, which allows to obtain a technical result.

According to the applicant, the composition of reinvoiced unknown and it is possible to draw a conclusion about conformity of the invention to condition patentability on the novelty.

As stated set of essential features showing new properties that allow you to obtain the change of the quantitative outcome measures, and improved fire resistance, improved physico-mechanical characteristics of rubber as compared with the known rubber, it is possible to draw a conclusion about conformity of the invention to condition patentability of "inventive step".

Obtaining the inventive rubber mixture is carried out in industrial conditions on mixing rolls.

The rubber mixture obtained by mixing the rubber BNKS-40 AMS with ingredients on a laboratory roll mill for 35-40 minutes At the order of input of the ingredients is as follows:

1. The dissolution and the plasticization of rubber BNKS-40 AMS within 5 min when the gap between the rollers 1-2 mm;

2. Enter stearin, sulfenamide C, Naftna - 2, N-nitrosodiphenylamine, zinc oxide, diafana OP for 3 min, increasing the gap between the rollers to 5-6 mm;

3. Enter chalk, barium borate, antimony trioxide, rosin for 2 min;

4. Enter carbon black P 701, chloroparaffin CP-1100 for 8 min;

5. Water carbon black P 514, trichloracetate for 10 min;

6. Input turama N,N'-dithiodimorpholine for 4 min, the reduction of the gap to 1-2 mm;

7. Pass through the roller gap of 1-2 mm for 3 minutes. The cooled mixture flowing water to a temperature not b is over 20°C.

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

To obtain a rubber compound used the following materials: nitrile butadiene rubber stamps BNKS-40 AMS - TU 38.30313-2006; vulcanization accelerators - thiuram D (tetramethyldisilazane) - GOST 740-76, sulfenamid C (N-cyclohexylbenzothiazole-2) - TU 113-00-057616376-02-95; vulcanizing agent is N,N'-dithiodimorpholine - TU 6-14-321-79; fillers - technical carbon P 701 and P 514 - GOST 7885-86; chalk - GOST 12085-88; a vulcanization activator is zinc oxide (zinc white) - GOST 202-84; technological additive - stearin - GOST 6484-96; antioxidants - naphthas-2 (phenyl-2-naphtylamine) - GOST 39-79, deafen OP (N-phenyl-N'-isopropylacetanilide) - TL6-14-817-81; antiscorching - N-nitrosodiphenylamine - TU 6-14-907-88; plasticizers trichloroethylphosphate - TU 2493-319-05763441-2000, rosin - GOST 19113-84; flame retardants antimony trioxide THAT 48-14-1-88; chloroparaffin CP-1100 - TU 2493-211-05763458-97; barium borate - TU 113-07-014-91.

In the proposed rubber mixtures can be used analogues of rubber and ingredients, produced by different companies.

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

Carbon black N 701
Table 1
The contents of the ingredients, parts by weight
IngredientsRubber mixture according to the inventionThe placeholder
The NBR100,0100,0
Thiuram D1,51,5
N,N'-dithiodimorpholine2,02,0
Sulfenamid C2,02,0
Naphthas-21,51,5
Deafen AF1,01,0
Stearin1,0-
Rosin5,05,0
N-nitrosodiphenylamine1,0-
Dibutyl-15,0
Chalk30,030,0
55,055,0
Carbon P 51420,020,0
Zinc oxide5,05,0
Antimony trioxide4,0-
Chloroparaffin CP-110020,0-
Trichloroethylphosphate15,0-
The barium borate5,0-

Comparative characteristics of the new formulation of the rubber mixtures according to the invention application and the rubber mixture of the prototype are shown in table 2.

Table 2
№ p/pIndicesRubber mixture according to the inventionThe placeholderControl methods
1Conditional tensile strength, M is a, not less than10,0to 12.0GOST 270-75
2Elongation at break, %400300GOST 270-75
3Hardness shore a, unit shore a70-7560-75GOST 263-75
4Fire (the burning time of the sample), s1-2More than 20
5Oxygen index, g/m328,2-GOST 12.1.044 - 89
6Change indicators And+T(7:3) at 23°C for 24 h, %+10+10GOST 9.030 -74

From table 2 it follows that the rubber mixture according to the invention on the basis of butadiene-nitrile rubber has elevated uprugoopticheskii properties compared with the prototype, higher fire resistance (less time to mount the ia sample), as well as the high value of oxygen index, then there is a nonflammable material.

Given the above, according to the applicant, the invention meets the condition of patentability "industrial applicability".

Fire-resistant rubber mixture based on butadiene-nitrile rubber, including thiuram D, N,N'-dithiodimorpholine, sulfenamid C, naphthas, 2-deafen OP, rosin, chalk, carbon black P 701, carbon black P 514, zinc oxide, characterized in that the mixture additionally contains stearin, N-nitrosodiphenylamine, antimony trioxide, chloroparaffin HP-1100, trichlorethylene, borate and barium in the following ratio of ingredients, mass:

The NBR100,0
Thiuram D1,3-1,6
N,N'-dithiodimorpholine1,8-2,1
Sulfenamid C1,8-2,1
Naphthas-21,3-1,6
Deafen AF0,8-1,2
Stearin0,8-1,2
Rosin4,0-6,0
N-nitrosodiphenylamine0,5-1,0
Chalk20,0-30,0
Carbon black N 70145,0-55,0
Carbon P 51415,0-25,0
Zinc oxide3,0-5,0
Antimony trioxide3,0-5,0
Chloroparaffin CP-110017,0-22,0
Trichloroethylphosphate12,0-18,0
The barium borate4,0-6,0



 

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