SU1249037A1 - Butadiene-nitrile rubber-base stock - Google Patents

Description

The invention relates to the rubber industry, in particular, to a rubber compound based on butadiene nitrile rubber.

The purpose of the invention is to increase the durability and scorch of the mixture, increase the tear resistance and resistance to oxidizing rubber from it.

As a modifier of butadiene nitrile rubber, a polyhydrophosphoryl compound of the general formula is used.

n

-r-oh-0y

about

P

in particular, polydistilen glycol phosphite (PDEGP) and poly triethylene glycol phosphite (PTEGP) in combination with sulfur in the absence of organic vulcanization accelerators.

Compounds of general formula (I) are obtained by known methods, for example, by reacting pyrophosphorous acid with ethylene oxide at a ratio of 1: 3 at 0-50 ° C or equivalent amounts of dialkyl phosphites and glycols.

26 100

about-

2

five

one

 .

50

100 100 100

100

2

five

one

50

1.5 23

855 10.5 1

50

7.5

50

50

ten

Polyhydrophosphoryl compound (polyphosphorite) is a thick, colorless liquid with

40

| 20

 1.4650, d; 1,3803, MR, - 57.7, calculated 55.2,

. Found,%: C 25.74; H 5.96; R 22.43.

Calculated,%: C 25.9; H 5.81; R 22.26,

The degree of oligomerization of polyphosphite H 40-50 characterizes the boundary indicators of the molecular mass distribution of polyphosphite molecules, which is very laborious and difficult to obtain with a strictly specified value.

The data obtained are presented in Table 1-7

Rubber mixtures of the specified composition are vulcanized in an electric press in the mode for 60 minutes. The properties of the obtained vulcanizates are given in table., 2,

These loss of strength when vulcanizates are exposed to a 20% aqueous solution of chromic anhydride in a 2% sulfuric acid solution (temperature 50 С, duration 15 days, f fo - fx,%) are presented in Table 7

Table 1

100

100 100 100 100

1.5 2

55 11

34

55

eleven

50

50

thirty

50

50

80

1012

Ingredients

The content of components in the mixture, MA

LJlEiriZLlOZIIIIIj-IIIir.

PTEGP (p 40-50)

Oligoefyracrylate TSh-Z.

Altax

#

Base object Known mixture.

Flour vulcanisation at 120 ° C, Tg, min

Conventional tensile strength, MPa

Elongation at break

Tear resistance, kN / m

Shore hardness, used

The coefficient of temperature resistance at

14 20 45 45 45 45 45 45

18.7 14.8 21.8 23.2 25.8 26.5 21.2 21.7 24.5 26.7

550 550 480 500 510 550 500 520 510 500

25 18 35 38 45, 54 38 42 44 50

78 64 65 66 68 70 64 67 62 63

by strength

0.25 0.27 0.46 0.49 0.44 0.50 0.41 0.48 0.51 0.55

relative elongation 0.21 0.34 0.52 0.50 0.51 0.51 0.48 0.49 0.53 0.50

Continuation of table

12 15 18

table 2

A5 45

24, 5 25.6

560,490

40 43

68 71

- by the way to

relative elongation

0.50

0.51

0.52

0.53

Technical carbon I1M-75

PDEGF (and 40-50)

PTEGP (p 40-50)

Altax Phosphite P

- S1

8-C - "(

Accelerator

SNG O

SNG-CH2

.u er

SNS

Scorch

according to muni

. Tu, min 25

45

Conventional tensile strength, MPa

18.0 20.8 17.8

Elongation at break,% 520

560 530

50

50

50

50

25

0.5

Table 6

26

45

35

18

21.9

24.2

26,6

540

520

530

e-

27

75

38

65

on the strength- ti

0.30 0.47 0.29 0.48 0.47 0.43

relative elongation

0,270,510,280,500,510,50

Editor N.Rogulich

Compiled by L.Reutova

Tehred M. Khodanich Proofreader M. Maksimishinets

Order 5592 Circulation 470 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

1249037

10, Continuation of table 6

28

37

26

29

75

64

76

75

Table 7

Claims (1)

RUBBER MIXTURE BASED ON BUTADIENE-NITRIL RUBBER, including sulfur, zinc oxide, stearic acid, carbon black and a phosphorus-containing modifier, characterized in that, in order to increase the resistance to vulcanization, increase the tear resistance and resistance to rubber oxidants, contains as a phosphorus-containing modifier a polyhydrophosphoryl compound of the general formula 'H ι -P-0-X-0- 1 II L θ Jn where: X is the residue of di- or triethylene glycol; and = from 40 to 50, in the following ratio of components, parts by weight: Nitrile butadiene rubber 100 Sulfur 1.5-4.0 Zinc oxide 4-8 Stearic acid lot 0.5-2.0 Carbon black 30-80 Polyhydrophosphoryl connection 7.5-18.0 , 1249037