SU1168574A1 - Rubber mixture - Google Patents

Abstract

RUBBER MIXTURE based on unsaturated rubbers, including thiuram, vulcanization accelerator, antioxidant, softener, zinc oxide, chalk, kaolin, o tl and h rani and so 4to, in order to increase the durability of the rubber mixture to the previous pre-tenure vulcanization, it additionally contains Oktofor NA alkylphenolamine resin, and the components of the mixture are taken in the following quantity, m.ch .: Unsaturated rubber 100 Thiuram. 2-3 Vulcanization accelerator 1.0-1.5 Anti-burner 1.3-1.7 M dryformer4-9.5 Zinc oxide5-15 cl Mel94-125 Kaolin20-30 AlkylPhenolamine resin Oktophor NA 1-5

Description

Od

00 O1

4 11 The invention relates to rubber industry, in particular to the development of vulcanizable rubber compounds based on non-saturated rubbers, and can be used in the cable industry in the manufacture of sheaths of reinforced cords for electric heaters. The purpose of the invention is to increase the resistance of the rubber compound to premature vulcanization. In tab. 1 shows the composition of rubber compounds. The mixture of all components, except thiuram, is carried out in a laboratory mixer at 40-60 ° C for 7 mil. Thiuram is introduced on the rollers as a masterbatch after cooling the mixtures to. The resistance of the rubber mixture to premature vulcanization is assessed by the time before the start of scorching at 100 ° C by Mooney B5 (min) and by the change in plasticity before and after boiling in water. Both indicators are determined on samples of unvulcanized rubber mixture in the form of disks and cylinders respectively. Samples of vulcanizates to determine the physicomechanical properties are made in an electrically heated press at 151 ° C with an increase of 15 minutes for the plates. The properties of rubber compounds and vulcanizates of them are given in table. 2. In table. 3-5 data on the use of various accelerators, 74 antioxidants and plasticizers in the composition, respectively; in tab. 6 properties of the mixture with and without microdoxy of sulfur .: As can be seen from the data table. 1-6, the introduction of Octofor NA increases the resistance to the premature vulcanization of rubber mixtures based on carbohydrate unsaturated rubbers SKI, SCS with different accelerators, phenolic and amine antioxidants, and various plasticizers. A micro dose of sulfur is introduced into the composition in order to reduce the relative residual deformation of the rubber shell of the finished product. It does not affect the resistance to premature vulcanization of the rubber compound. The vulcanizing agent is thiuram. In the composition of the rubber mixture, technical grade PM-15 is used to color it from light gray to black. Carbon PM-15 in the indicated dosage does not affect the resistance to premature vulcanization of the proposed rubber compound. The use of resin Octrfor NA based on synthetic rubbers leads to a significant increase in the resistance of the proposed rubber compound to premature vulcanization and. improving the quality of the surface of the cord sheath while maintaining a complex of technical properties, in particular, tensile strength. Table 1

Ingredients

Paraffin

Vaseline oil

Zinc oxide

a piece of chalk

Kaolin

Dye (carbon black)

Alkylphenolamine resin Oktophor NA.

Continuation of table 1

Content of ingredients, mac part

I

proposed

known

3

2

 5 15

four

10 94 25

116,15125

2030

five

0.2510

0.25

15

3

Time to start scorch

at Mooney (tj) min

Plastic

initial

after 30 min boil

in water

after 50 min boil

in water

Tensile strength

Sha

Relative extension

at break,% Time t, at which the viscosity of the samples is 5 units.

table 2

More

Bscheh 45 45

0.61

0.59

0.61

0.58

0.56

0.57

7.4

8.0

622

620 rubber compound increases

Table 3

Alkylphenolamine resin Oktophor NA

Initial plasticity

after 30 min boil: in water

after 50 min boil in water

1168574

8 Continuation of table 3

0.59

0.59

0.62 0.60

0.24

0.58

0.50 0.60

0.18

0.56

0.22 0.58

1168574

ten

Continued tabl., 4 Ingredients, parts by weight, f, and properties Time to start scorch at Mooney, More than min8-20 45 Strength at stretching,. MPa7.5 7.4 Relative elongation at break,% 604 620.Ingredients, parts by weight, and properties

SKI-ZS

SKS-30 ARKPN

Thiuram

Sulfur; Captax.

Antioxidant VG-2246

Stearin

Paraffin

Vaseline oil

Zinc oxide

a piece of chalk

Kaolin

Dye (technical carbon PMalkylphenolamine resin O

Initial plasticity

after 30 minutes of boiling after 50 minutes of boiling

60 40 2.5

one

1.5

1.25 2

4 10 94 30

0.25

3

0.59 0.57 0.56 Continuation of Table 5 Indicators More More More than 13 45 15 45 13 45 7.47.6 7.5 7.7 7.3 7.6 600 605 590 595 600 615. T a b l and c a 6 Indicators

13

Ingredients, Mach., And properties

Start time of scorching at 100 ° C Flour, min

Strength at stretching, MPa Relative elongation at breaking,%

d

Relative residual strain,%

 The relative residual strain of rubber for cable sheaths, wires,

and cords should be no more than 35% OCT16 0.505.015-79.

14

1168574 Continuation of table 6

Indicators

More

45

7.3 640 37

Claims (1)

RUBBER MIXTURE based on unsaturated rubbers, including thiuram, vulcanization accelerator, antioxidant, Softener, zinc oxide, chalk, kaolin, characterized in that, in order to increase the resistance of the rubber compound to premature vulcanization, it additionally contains Octophor NA alkylphenolamine resin, and components mixtures are taken in the following quantity, m.h .: unsaturated rubber 100 Tiuram 2-3 Vulcanization accelerator 1.0-1.5 Antioxidant 1.3-1.7 ~ Softener 4-9.5 5 Zinc oxide ^5-15 cells a piece of chalk 94-125 | M / Kaolin 20-30 g Alkylphenolamine I Resin Octophor NA 1-5 Ξ 1-5 1 1 168574 2