SU1151552A1 - Butadiene-nitrile rubber-base mix - Google Patents

Abstract

RUBBER MIXTURE ON THE BASIS OF BUTADIUM NITRIL RUBBER, 1 including sulfur, mercaptobenzothiazole, stearic acid, zinc oxide, carbon black acidic in character with a specific geometric surface of 90-110, so that the subframe of the composition of the rubber mixture with a geometric surface of 90–110, which is the same as the bottom of the bottom plate, a change of the sub- hooks, and one has to move, and there is a change of approach, and there is a change that there is a change that you have to go to, and you have to go, and there are 16 p from it, as an acidic carbon black with a specific geometric surface of 90110 MVr, it contains carbon black modified from 7 to 10 May. hydrogen sulfide in the following ratio of components, wt.h .: Butadiene nitrile rubber. 100 Sulfur 0,75-1,5 Mercaptobenzothiazole 0,7-0,9 Zinc oxide 4-6 Stearic acid Technical carbon acid (L character with a specific geometric surface 90-110, modified 7-10 wt.% Hydrogen sulfide 5-6Q .

Description

The invention relates to the production of rubber compounds based on butadiene nitrile rubber (BNK), which can be widely used in the manufacture of rubber products for various purposes.

Known rubber mixtures based on the specified rubber, the formulation of which is based on the use of sulfur as an vulcanizing agent with an accelerator and an activator 1 However, such mixtures have a low complex of properties.

Closest to the proposed technical essence is a rubber mixture based on butadiene nitrile rubber, including sulfur, mercaptobenzothiazole, stearic acid, 1.shnka oxide, carbon black acidic with a specific geometric surface of 90-110 2.

However, the known rubber mixture has insufficient resistance to scorch, and rubber from this mixture - low heat resistance and chemical resistance.

The purpose of the invention is to increase the rubberiness of the rubber mixture to scorch, increasing the heat and chemical resistance of rubber from it.

The goal is achieved by the fact that a rubber mixture based on butadiene nitrile rubber, including sulfur, mercaptobenzothiazole, stearic acid, zinc oxide and carbon black acidic in character with a specific geometric surface 90-110, as specified carbon black, modified carbon 7-10 May .% hydrogen sulfide in the following ratio of components, wt. h .: Butadiene nitrile

rubber100

Sulfur0.75-1.5

Mercaptobenzothiazole 0.7-0.9 Zinc oxide 4-6 Stearinova

acid1-2

Technical. acidic carbon with specific geometry515522

Chesical surface 90110, modified 5 7-10 May.%

hydrogen sulfide 5-60 Modified carbon dioxide by hydrogen sulfide is produced by passing hydrogen sulfide through O highly active technical carbon DR-100 of an acidic character with a specific geometric surface of 90-110 m / g of mass industrial production placed in a cylinder with an input and output current of hydrogen sulfide. The treatment of carbon black with hydrogen sulfide is carried out at room temperature (18-30 ° C) and for 1-2 hours. The obtained modified carbon black is then heated at 40 ° C for 30 minutes to remove residual (excess) hydrogen sulfide that is not chemically bound to the technical 5 carbon.

According to the weight and elemental analyzes, the amount of hydrogen sulphide chemically bound to technical carbon. It is 7-10% by weight.

0 As a result of this modification, carbon black does not acquire any odor. The highly active carbon black DG-100 modified with hydrogen sulfide is stored

5 in conventional carbon black packaging (paper bags) for a long time (3-5 years) without changing its composition and properties. Properties of rubbers with modified

0 highly active technical carbon that has been stored for 5 years is fully consistent with their properties with technical carbon prior to storage.

The composition of rubber compounds and properties

5 rubber compounds and rubbers obtained under optimal conditions are listed in Table 1 and 2,

As can be seen from the above table, 2 data on the use of hydrogen sulfide modified technical

carbon allows several times to increase the resistance of rubber mixtures to scorch (2.15 times), heat (7 times) and chemical resistance

5 rubber from the proposed mixture (proposed mixture and rubber of composition 5 in comparison with the known mixture and rubber (.: Leaving 7, table 2). Optimal31

The total sulfur content is 1 ma.h. and hydrogen sulfide modified carbon black - 45 wt. on 100 ma.ch. rubber

The composition and properties of the proposed rubber mixtures and rubbers with a minimum and maximum content of stearic acid, captax and zinc oxide with optimal sulfur content and modified H2S carbon black DG-100 are given in table. 3 and 4.

As can be seen from the table. data, the proposed rubber mixtures of composition 8 and 9 with the optimal dosage of sulfur (1 wt.h.) and hydrogen sulfide-modified carbon black DG-100 (45 mas.ch. per 100 mach.ch. rubber) with a minimum (volume 8)

515524

and the maximum (mixture 9) content of stearic acid, captax and zinc oxide also differs from the known mixture of composition 7 (Table 2) 5 with the same amount of DG-100 highly resistant to vulcanisation (the time before the vulcanization of the proposed mixtures is more than -2). times this indicator of a known mixture of composition 7), and rubber from the proposed mixtures of composition 8 and 9 have much higher heat (7 times higher) and chemical resistance compared to the known rubber of composition 7. The proposed rubber mixture has the best properties —and rubber SOS tava 5 with the optimal content of all components, stearic acid, captax and ca2Q ede zinc (Table 2).

Table 1

BNK (SKN-26) 100 100 100

Modified hydrogen sulfide technical carbon DG-100

Technical

carbon

DG-100

100

60

45

45 100 100 100 Mooney rubber scorch time at 120 ° C, TS, 29.0 38.7 41.0 min. Strength at 2.6 3.1. 2.7 tensile strength, MPa Tension at 300% elongation2.2 1.6 ni, MPa Relative 520 448 elongation,% Shore A hardness, 53 53 uel. units The coefficient of thermal aging (X 7 days) relative 0, 02 0.10 0.17 nominal elongation

After swelling (20 С x 30 days) In oil In-. industrial-30 strength, with stretching j% 64 74 from, initial elongation,% from 81.5 85 97, initial change 9.2 5.6 5.0 mass,%

Table 2 Its 45 43.0 44.0 a, rubber 2.8 32.0 32.4 1.4 12.0 12.2 580 492 490 53 0.23 0.22 0.23 0.03 79 100 100 99 4,8 3,6 3,0 In oleic acid tensile strength,% from 87 93 initial relative elongation,% from 76 76 97, operating change 16.7 15 12 mass,% In glacial acetic acid (10 days ) tensile strength,% from 40 61 initial relative elongation,% from 51.5 61 75 initial change 50 41 mass,% In a 25% KOH solution. tensile strength,% from 66 80 initial elongation,% from 99 100 initial change -2.7 -2.2 -1, mass,%

eight

Continued table. 2 95 99 98 10.8 14 70 81 37 100 100 86 100 100 100 -1.6 -0.9 -0.5 Properties of rubber compounds and rubbers In water

55

63 84 92

76.5 82 100 100 100 100

2.8 2.0 0.2 0.1

Table 3

100

100

2.0

1.0

1.0

1.0 0.9 0.7

6

45

45

ten

1151552

Continued table. 2

100 100

82

1.8

Table 4

Time nodolkaNizatsii rubber mixtures according to you at 120 ° C, Tg,

45.0 42.0 min

Strength

during stretching, MPa 31.8 32.1

Voltage at 300% elongation

11.8 12.1 ni, MPa

Relative 497 489 elongation,%

Shore A hardness,

UED.64 66

Heat aging coefficient (X 7 days) by relative lengthening 0.21 O, 23 Indicators of the properties of mixtures and rubber Control Offered Known 1.2 3 4-5 6 7

tab. four

After swelling (20 C 30 days)

In industrial oil-30

tensile strength,%

98 99 from the original

relative extension, %

99 100 from the original

change

3.8 3.5 mass%

oleic acid:

tensile strength,% of

90 9G, 5 original

relative elongation, 7,

97 98.4 from the initial change in mass,% 14.3 13.8

ice acetic acid (10 days)

strength at

stretching

77.5 80.0

% of the original.

12

1151552

Continued table. four

Indicators of properties of mixes and rubbers

pgi

eight

relative lengthening, 7, from. original

weight change,%

In a 25% solution of KOH

strength

when stretched

% of the original

relative

elongation,

99.5 100

% of source

change -1.0 -0.8 mass,%

water

strength

when stretched

99.4100

% of the original

relative extension, ,

99.5100 from the original

change 0.1% by weight,%

Claims (1)

RUBBER MIX BASED ON BUTADIENNITRILE RUBBER, containing sulfur, mercaptobenzothiazole, stearic acid, zinc oxide, acid carbon black with a specific geometric surface of 90-110 m ² / g, characterized in that, in order to increase the resistance of the rubber compound to vulcanization chemical resistance of rubbers from it, as acid carbon black with a specific geometric surface of 90- 110 m ² / g it contains carbon black, modified May 7-10. % hydrogen sulfide in the following ratio of components, Butadiene nitrile rubber Sulfur Mercaptobenzothiazole Zinc oxide Stearic acid Technical 100 0.75-1.5 0.7-0.9 4-6 1-2 carbonic acid with a specific geometry of 90-110 m ² / g, modified, May 7-10.% Hydrogen sulfide 5-6Q.