SU956509A1 - Rubber stock based on carbochain rubber - Google Patents

Description

The invention relates to rubber compounds used in the tire and rubber industry.

A known rubber mixture based on chain-chain rubber, including bottom distillation of styrene 1 as a plasticizer.

The disadvantage of rubber mixtures containing the specified plasticizer is that its use leads to a deterioration of the strength characteristics of the vulcanizates.

Closest to the invention is a rubber-based chain rubber rubber, which includes a vulcanization agent, a vulcanization accelerator, a dispersant, a vulcanization activator, a filler and a plasticizer, in which an aromatized petroleum oil-PN-BSG GOST 12861-67 is used as a plasticizer,

However, the well-known rubber mixture has not enough good technological properties (rolability, spritability), and vulcanizates from it have relatively low strength and frost resistance.

The purpose of the invention is to improve the technological properties of the rubber mixture, namely, the crushability, spritability / increase in strength and frost resistance of vulcanizates from it, as well as cost reduction and expansion of the range of plasticizers,

ten

This goal is achieved by the fact that a rubber mixture based on chain-chain rubber, including a vulcanization agent, a vulcanization accelerator, a dispersant, a vulcanization activator, a filler, and a plasticizer, contains as a plasticizer the vacuum distillation of the de-coalised vat residue from the rectification of hydroforming products. propylene, boiling at 350-400 ° C, and the components of the mixture are taken in the following ratio, mA.h: Carbon chain rubber 100. Agent vulcanization 1.0-3.0

25 Vulcanization accelerator 0, 5-2.5 Dispersant 0.5-3.0 Vulcanisation activator 2.0-10.0 0 Filler 20.0-85.0 Residue vacuum distillation of the de-balanced vat residue from the rectification of propylene hydroformylation products, boiling away at 350–400С 1.0–25, the Experimental plasticizer — the vacuum distillation residue of the dekobaltizirovann.go of the cube from the reactivation of the products of the propylene hydroformalization of the boil off at a temperature higher, namely at 350–400 ° С production of butyl spins and 2-ethylhexanol. The plasticizer GF-350 is a brown liquid visco-flowing liquid oligomer with the following characteristic: Molecular weight, $. , 450-500 Density, HS / cm 0.94-0.95 Acid number, mg KOH / G3.0-4.0 Essential number, mg KOH / G140-160 Hydroxyl number, mg KOH / G 16-18 o Carbonyl number, mg KOH / G 40-50 Bromine number, g Br / 100 g4.0-5.0 Volatile content (),% 0.15-0., 50 Ash content,% 0.5-1.5, Po According to chemical and spectral analyzes, the GF-350 plasticizer contains compounds with layered alcohols and carbonyl groups. Dov, Laboratories investigated: a sample of the plasticizer GF-350 with the following characteristics was exposed to rubber mixtures. Molecular mass, cu, 452 Density, gf / m 0.945 Acid number, mg KOH / G3.79 Ester number, mg KOH / G149 Hydroxyl number, mg KOH / G17.6 Carbonyl number, kg KOH / G37 Vromny number, g Vg / 100 g4.74 Ash content,% 1.26 Volatile content,% 0.36 GF-350 plasticizer has a weak specific smell The chorus is mixed with elastomers to form rubber compounds with a smooth shiny surface. A comparison of the experimental plasticizer is carried out with the most widely used: oil PN-6Sh, dibutyl phthalate, dibutyl sebacinates, liquid paraffin. Example 1. In a rubber mixture of the tread type based on a mixture of rubbers: isoprene SKI-3 (50 May. H.), Butadiene SKD-P (30 parts by weight), styrene butadiene SKS-30 ARKM-15 (20 parts. ) composition, ma.ch. on 100 ma.ch. rubber: Sulfur2 1 Sulfenamide C 1.3 Zinc white 4.0 Rosin1.0 Stearin1.5 Rubrax5.0 Neozon D. 1.0 Product 4010 A 1.0 Mcrkwax ZV-1 2.0 Soot (TU PM-100) 55.0 were introduced 15 mas.h. oil PN-6Sh (prototype) or 15 ma.ch. experienced plasticizer GF-350. The production of the mixtures is carried out on rollers at a roll temperature of 6 ° -70 ° C for 30 minutes. Rubber mixtures containing an experienced plasticizer have technological properties at the level of mixtures containing oil PN-6Sh. Rubber with experienced plasticizer have increased strength and frost resistance. Table 1 presents the properties of rubber compounds and protector-type vulcanizates. T a and c a 1 Plasticizer according to GOST 415-75 - 0.51 Mooney Viscosity Stress at 300% elongation, MPa Strength at break.

Example 2. A mixture of standard vutadienenitrile SM composition, mac. rubber;

Sulfur

Zinc white

Stearinova

acid

Captax

TU DG-100vvod t 5 ma.ch. DBS (dibutyl sebacate) or 25 ma.h. DBP; (AH6yTHh phthalta), or 25 ma.h. experienced plasticizer GF-350. The manufacture of rubber tires is carried out on a roll mill according to a conventional mode.

In table-2 properties of rubber mixtures and vulcanizates based on SKN-40 CM are presented.

Table 2

Plasticity according to GOST 415-75

Stress at 300% elongation, MPa

Tensile strength at break, MPa

Relative extension , %

Residual elongation,%

Rebound elasticity,%

Heat aging 100 ° 72 h

KP Ku

Brittleness temperature, with

From the data presented in Table 2, it can be seen that the plasticity of the test rubber mixtures is maintained at the level of the plasticity of rubber mixtures restraining dibutyl sebacate. Vulcanizates of rubber compounds with an experienced plasticizer have higher stress values during elongation and tensile strength at break compared to vulcanizates containing dibutyl phthalate and dibutyl sebacate. The heat resistance and frost resistance of rubbers with an experienced plasticizer are on par with those containing plasticizers-antifreeze-dibutyl phthalate and dibutyl sebacate. Marked exudation of dibutyl phthalate to dibutyl 0, 45 0.52 0.63 0.53

6.2 6.1 8.0

11.5

24.0 .13.6 11.4 24.9

645

483 439

ten

29

44

31

0.67 1.0 0.93 0.90 0.94 0.60 0.79 0.60

-50

-50

-51

-44

batsinata in the process of heat aging, which is not observed in samples containing an experienced plasticizer.

Example In the rubber mixture of a standard type based on ethylene propylene butadiene rubber of the EPDM-40 compound, in units; weight; on 100 ma.ch. rubber:

Sulfur2.0

Kaptaks0,5

Tiuram1,5

Stearin1,0

TU PM-7550,0

Zinc white 3.0 was added 5.ma.h., petroleum jelly or 1, 3, 5 ma.ch. experienced plasticizer. The manufacture of mixtures is carried out on rollers at 60-70 ° C for 25 minutes.

The properties of rubber compounds and vulcanizates are presented .3.

As can be seen from table 3 with the introduction of an experienced plasticizer improves -. ValtsuemoT, 10, m1.31 2.0 Syringe capacity, score5-6 5 Plasticity according to GOST 0.20 0.06 415-75 Stress at 300% elongation, MPa8.6 7.2 Strength at break, MPa Relative elongation,% Residual elongation,% Hardness in TM-2 Elasticity in rebound,% 38 46 Thermal aging 100 C; f72 h Example 4. In a rubber mixture of standard type based on styrene-butadiene rubber, CWR-D. on May 100, h rubber: If 5 Sulfur Zinc white Stearin 2., 6 Santokur 0.7 TU PM-75 50.0

with rubber and spritiness of rubber mixtures, stress is applied at 300% elongation and tensile strength at rupture of vulcanizates while maintaining the remaining indicators of the prototype level. ... 1.78 2.31 3.02 5-6 5 3-4 0.20 0.21 0.03 0.33 11.211.4 2.6 19.117.2 455424 1616 8 40 40 5 m.ch. oil PN-6SH (prototype) or 3, 5, 7 wt.h. experienced plasticizer. The production of mixtures is carried out on rollers at 55 + 5 ° C 55 26 minutes. Properties of standard rubber mixtures containing oil PN-6Sh, and mixtures-,. containing an experienced plasticizer are presented in table 4.

Valuability, 10

Plasticity according to GOST 415-75

Mooney Viscosity, B-1-4-100

Stress at 300% elongation, MPa

Strength at break, MPa

Relative extension , %

Residual elongation

As can be seen from Table 4, an experienced plasticizer leads to an improvement in the creeping ability, a decrease in Mooney viscosity and an increase in the plasticity of rubber compounds, stress stress at 300% elongation and tensile strength at rupture of vulcanizates.

Of given in Table. 1-4 data shows that the introduction of the GF-350 plasticizer into rubber compounds is different: types and on the basis of different chain-chain rubbers lead to an increase in the technological and mechanical properties of rubber, namely, rollability by 15-50%, perceptibility by 30%, limit tensile strength by 15-40% and frost resistance by 19% (compared to the prototype). Improving the valtsuimosti and imprinting rubber mixtures reduces rejects when stuffing and calendering of specialized blanks. In addition, there is no sweating on the surface of rubber and a significant increase in the strength characteristics of rubber, while ensuring a high frost resistance index (at the level of the best antifreeze-dibutyl phthalate and dibutyl sebacate). Since DBP and DBS are high cost synthetic products, replacing them with a product derived from waste gives a significant economic effect.

Table 4

0.68 -0.79 0.73 1.06

0.26 0.28 0.33 0.36

56.

45

45

41

10,512,910,910,9

18,120,919,720,0

483512536648

12161920

Claims (1)

1. US patent 3923769, this. M., TsNIINefteKhim, 1976, pp.3-20 cl. 260-112,5, pub. 1975. (prototype). plasticizers for rubber compounds