SU763392A1 - Polymeric composition for producing packing moulding material - Google Patents

Description

one

The invention relates to the rubber industry, in particular to the development of a polymer composition for the preparation of gasket molding materials .5

The known polymer composition for the manufacture of gasket moldings, including synthetic rubber - a copolymer of 1,3-Outadiene (for example with acrylonitrile), steroaric acid, vulcanization accelerators, zinc oxide, carbon black, and sulfur, for example in. ratio by weight, respectively, 100: 1: 3: 5.0: 55: 0.5 l.

Gasket materials obtained from this composition have insufficient acid resistance, as well as a high accumulation of relative residual compressive deformation when operating in the sulfate-nickel chloride electrolyte 20 at 80. during the electrolysis process of nickel.

The purpose of the invention is to increase the acid resistance of gasket materials, as well as reduce the accumulation of relative residual compressive deformation when the gasket materials work in a sulfate-nickel electrolyte at 80-90 ° during nickel electrolysis.

The goal is achieved by the fact that the polymer composition for the manufacture of strip molding materials, including synthetic rubber - a copolymer based on 1,3-butadiene, stearic acid, a vulcanization accelerator, zinc oxide, carbon black and sulfur, contains as a rubber 1,3-butadiene copolymer and o-methylstyrene in the following ratio of components, parts by weight:

A copolymer of 1,3-butadiene and {.-Methylstyrene 100. Stearic acid 1-2

Vulcanization accelerator3, 2-6.1 Zinc oxide4-5 Soot 55-70 Sulfur 0.2-0.5 Example 1. Based on butadiene - (SKMSZOARC-methylstyrene rubber on rollers at a roll temperature of 40-50 ° C for 30 -35 min. A composition of the following composition is prepared, by weight.h .:

Gauchuk 100 Stearic acid 1.5 Dltex1,8

Tiuram1, 4

Santokur. 1.5

Zinc Oxide5.0

Soot PM-1555 Sulfur 0,2

Technological duplications of the composition, physicomechanical indicators of volcanic eats based on it, and indicators of the accumulation of the relative residual deformation of vulcanizates at H: life for this and the following examples are given in Table. 1-4.

Example 2. The composition is prepared on the basis of SKMS-ZOARK butadiene-of-methylstyrene rubber on rollers at 40-50С for 30-35 minutes according to the following recipe, parts by weight :100

Rubber

Stearinova

1.5

acid 2.0

Altax 2.6

Thiuram

5.0

Zinc oxide

Soot PM-15 70.0

 0-5,

Sulfur 3 (control). K

Example

The position is prepared on the basis of butadiene rubber M on rollers at 40–50 ° C. for 30-35 minutes according to the following recipe, parts by weight:

Rubber100

Stearinova

acid1,5

Altax2.0

Tiuram2,6

Zinc Oxide 5.0

Aldol-of-Naf

TIL-S1MIN .1,5

SazhPM-15 55.0 Sulfur0.4

The data given in table. 1 and 2, indicate that the technological properties of the composition based on .butadienes, SKMS-ZOARK-based methyl styrene rubber are not inferior in terms of the properties of the composition based on SKN-brand nitrile-butadiene rubber. Technological properties of the compositions

26M. The coefficients of thermal aging of vulcanizates made on the basis of SKMS-ZOARK rubber in sulfate-nickel electrolyte with respect to tearing strength and relative elongation (according to thermal aging coefficients according to these parameters) during aging for 10, 15 days are characterized by satisfactory indicators, and From 45 days for the vulcanizates from the control example (based on SKN-26M rubber), the structuring was observed according to the resistance to rupture.

From the data in the table. 4 it can be seen that the accumulation of relative residual deformation under compression during aging in air (at) for 120 days of vulcanizates based on SKMS-ZOARK rubber is characterized by significantly better indicators than SKN-26M rubber-based vulcanizates. When IO-with vulcanizate-based rubber SKMS-ZOARK in the aging process by the accumulation of relative residual deformation

5 compressions up to 30 sou.t also have a beam of best indicators, and during aging for a period of 20 days they are characterized by identical indicators. Vulcanizates based on SKMS-ZOARK rubber on the accumulation of relative residual deformation during aging in sulfate-chloride-nickel electrolyte at 20% compression for 120 days,

at 90s, they have about 2 times better indicators than vulcanizates based on SKN-26M rubber.

In addition, the proposed composition is less toxic than the composition based on butadiene-nitrile rubber, since such toxic ingredients as lead gel and gishol-L-naphthylamine are completely excluded from it.

Table

Mooney viscosity at

100 ° C

Mooney scorch resistance with

120C, micron

70

76

27

25 Physical and mechanical properties of vulcanizates

Vulcanization temperature, ° С

Vulcanization time4, mi

Stress at 100% elongation, egs / cm; Stress at 300% elongation, kgs / cm

Tear resistance, cts / cm

Relative extension %

TM-2 hardness Residual elongation,%

Rebound elasticity at 20 ° C at 100 ° C

Tear resistance, kgf / cm

at 20 ° C at 100 ° C Properties of vulcanizates in the process of aging of nickel electrolyte at

elongation resistance

- T a b and C a 2 to heat aging

20

33

92

100

310

69

2

47 67

35 16

49 20

45 16

1.05 1.01 1.05

10 1.09 0.85 Table in sulphate-chloride 90®С

Data on the accumulation of the relative residual deformation of the compression of volcanic compounds in the aging process in hot air at 90 ° and in an environment of sulfate-nickel-electrolyte at 90 ° C

The accumulation of relative residual strain in the process of aging in hot air (compression of 20%),%

0 1

five

15

thirty

120

10 1 5

15

thirty

120

The accumulation of relative residual strain in the process of aging in the electrolyte (20% compression),%

Table4

Claims (1)

Claim A polymer composition for the manufacture of cushioning molding materials, including synthetic rubber-based copolymer based on 1,3-butadiene, ³ stearic acid, a vulcanization accelerator, zinc oxide, soot and sulfur, characterized in that, in order to increase the acid resistance of the cushioning materials, as well as reduce · ' ⁰ accumulation of relative residual compressive strain during the operation of cushioning materials in, sulfate-chloride-nickel electrolyte at 80-90? during nickel electrolysis, composition 55 contains a copolymer as rubber 1,3-butadiene and β-methylstyrene in the following ratio of components, parts by weight: The copolymer of 1,3-butadiene and of-α-methylstyrene 100 Stearic acid 1-2 Vulcanization accelerator 3.2-6.1 Zinc Oxide Soot55-70 Sulfur 0.2-0.5