SU704962A1 - Rubber mixture - Google Patents

Description

(54) RUBBER MIXTURE

 . ; one

The invention relates to the composition of rubber compounds on the basis to distinguish between types of rubber, both natural and synthetic, used in the production of tires, and rubber technical products, for example, technical plates, facing of transport tapes, wedge pvm1nvy, etc. . and can be used in factories producing rubber products and in factories producing tires.

A known rubber mixture based on unsaturated rubbers, including a filler, a vulcanizing agent and a softener, for example, gum rosin 1.

However, rubbers containing gum rosin in their composition are characterized by insufficient resistance to heat aging and relatively low thermomechanical stability, which is associated with an increased tendency of rosin to oxidation by air oxygen and self-oxidation due to its high non-cessation.

These natural properties of rosin do not allow granulating it, since the granules of such rosin are fast due to oxidation.

stick together, and rosin at the same time, as an ingredient of the rubber mixture, largely loses its useful properties.

The impossibility of the production of gum rosin in granular form is a serious obstacle to its use, since it leads to considerable labor-intensive preparatory operations when rosin is introduced into the rubber mixture (unloading from the drums, dredging. Dosing) and does not allow to mechanize and automate rubber preparation process 5. In addition, gum rosin. It is extremely scarce and expensive raw material, which increases the cost and rubber compound.

0

The purpose of the present invention is to increase the heat resistance, rubber compound, thermomechanical stability and reduce the cost of sales derived from it.

5 rubbers.

To achieve this goal, the rubber mixture is based on non-fluid. scum rubber, including a filler, a vulcanizing agent, contains as abchietino-фf-: maldehyde-maleic adduct in the following ratio of components, parts by weight: rubber-100, filler 20-100 curing agent - 1-10 , abietino-form sdegido-maleic adduct - 2-: 30.

Abietino-formadehyde-maleine adduct 2 is a solid glassy from light brown to brown color. Non-toxic. .

Characterized by the following indicators:; . , Temperature size g. 70-85C

...

: Molecule 310-550 u.e. weight

Acid. ,,. -, o- mgKON 160-185 -

r adduct

 - -. ; ,; -. . -. .

This softener is easily guaranteed, while retaining its beneficial properties of the ingredient rubber compounds in granulated fma. It is not caking for long periods of storage, free-flowing and will be able to find a widespread effect. in factories with an automated feed system, the weighing and dosing of ingredients .. Compared to living rosin, it is less scarce and is obtained from cheaper and more affordable raw materials, .-,:. - - ..

The compositions of rubber mixtures on the axis of unsaturated rubbers prepared in accordance with examples 1,2,3,4,5,6 are given in Table 1, -, .. - -. - -X rubber mixtures are prepared as follows; ..

PRI me R 1-4, load the na-mixer with nairit (100 cp) and mix for 4 minutes. On p of that min. magnesia is added, then to 8th stearin, carbon black and abieto-formaldehyde-maleino. new adduct, then on the 20th minute. loaded with zinc oxide. Total mixing time 25 min. The amount of softener injected and the quality of the product obtained are given in Table. 2,

Example 5. On the fifth minute, after loading the SKDs (50 parts by weight and SKY-3 (50 parts per hour), rubrax is added, on the seventh is stearin, on the ninth one is santhocur, on the twelfth - zinc oxide, - on the fourteenth minute, carbon black and abietin-formaldehyde-maleic adduct and sulfur on the twenty-eighth. The total mixing time is 32 minutes,. The quality of the obtained product is given in Table 2.

Example 6. A mixture was made in a rubber mixer in 2 cycles. In the first cycle, SKI-3 rubber (.ch.) Carbon black, product 4010 NA, neozon D, -stearin and abietino formaldehyde-maleic adduct -2 part) are loaded at a temperature of 120130 0 and mixed. Common cycle $ 1 - 7 min is confused ,,.

  In 1 cycle, the sulfur mixer, altax, and captax are loaded into a mixer at a temperature not higher than 110 ° C and mixed for three minutes. Then the resulting rubber mixture is discharged from the rubber mixer. The characteristic of the quality of the obtained product is shown on the creep graph of vulcanizers at 130 ° C

and load

00 KJi mg

 Thus, the tests of rubber mixtures and volcanicates yielded higher compared with rubber mixtures containing gum rosin in the same dosage, indicators on the resistance of rubber to heat aging. (see table 2), as well as on thermomechanical stability (see figure, 1), so that there are all other properties; rubber compounds and vulcanizates, such as tackiness, gchasticity, tear and tear resistance, remain at the level of rubbers containing gum rosin (see table 3), In addition, rubbers. made from the proposed rubber mixture, much cheaper than gum rosin based on the use of a cheaper product - abietino-formaldehyde-maleic adduct, the quality of the rubber is improved due to the durability of the abietino-formesdehyde-maleic adduct softened - to oxidation , V-:, / ii-: 4 “-f,.: - -.

Recipe of rubber mixtures Nairit SD-100 100 100 (chloroprene rubber) SKI-3 (isopre-new. Rubber), SKD (butadiene rubber) Soot TM-1540.0 Soot PM-75 Soot PM-100-. Altax Captax Product 4010 A Magnesium Oxide 7.0 Zinc Oxide-5.0 Santocure-Neozon-Rubrax-Stearin1.0 1.0 Abietino-formaldehyde-maleic. adduct2.0 5/0

704962

T a b l and c a 1 40,0 5,0 quality gum

RI-Offered (with

1.abietinformaldegvdomaleynovym

.390

2 20.0, adduct)

Known (with gum tissue-I

2 20.6

380 foil

At-. Offer of offer (o

2.abietinformal dehydro maleic mats-

550

Tom)

15.6

Known (from lively life)

15.0

foil)

When- Pre-offer ema (with

3. abyetino-.

-formaldehyde; NEW

adduct)

620

15

12.7

Known (with gum)

12.0

15

Pri- Prevodamer ema (with 4abietino-formalde .. gi dromal ein ad640

9.5 duct

thirty

19.6

-2.0 -20

320

-3.0 -25

285

19.0

-2.5 -27

15.2

400

310

-4.0 -37

14.4

-5,5 -27,5

12.0

450

10.5

-12.5 -38.5

370

460

-5.3 -29

9.0 Table Comparative characteristics of the proposed rubber mixtures and mixtures containing rosin in the same dosage

Known (with gum, 0 630 foil) 30

ri- Proposal ma (with abi5 etino

 formaldehyde maleic adduct) 5

19.5600

Known (with gum rosin) 5

19.5570

Comparative characteristic

properties of raw rubber mixtures and vulcanizates according to the invention and with gum rosin We offer (with abietino-formaldehyde-maleic 0.47 370 11.2 adduct) Known (with gum rosin) 0.4838011.1

Claims (2)

1. Belozerov N.V. Rubber technologists ,, M ,, - 1967; with. 179, 184, (prototype). . 2. Lesokhim and cuttings,. Reference information y-M., 1973, No. 9, p. 9-10.