BG1642U1 - An additive to caoutchouc mixtures - Google Patents

Abstract

The useful model is related to a based on technical carbon additive for caoutchouc mixtures received by vacuum pyrolysis of out of use automobile tyres, which contains (in weight %): carbon from 5 to95 ashes from 0.1 to 16 general sulphur from 0.1 to 3 silicon dioxide from 5 to 70 zink oxide from 0.11 to 4.5 calcium oxide from 0.11 to 1 iron(III) oxide from 0.11 to 1 aluminium(III) oxide from 0.1 to 1 magnesium oxide from 0.1 to 1, the total content of moisture being from 0.01 to 3%. In the mixtures for polymer products the additive is in the amount from 10 to 300 mass particles towards 100 mass particles of caoutchouc mixture.

Description

The utility model relates to a rubber compound additive applicable in the rubber industry.

BACKGROUND OF THE INVENTION

It is known that in the process of vacuum pyrolysis of end-of-life tires, technical carbon (solid residue) is obtained, which is used as a solid fuel since it has a combustion heat of about 6800 kcal. Such product is, for example, the technical carbon described in patent BG 65901 and obtained during the pyrolysis process of end-of-life tires.

Also known is a product described in patent application EP 1337593 A2, representing carbon blacks resulting from the vacuum pyrolysis of waste tires with subsequent purification with a magnetic separator. The patent data on product qualities obtained when used as a filler in rubber mixtures indicate that the readings have poor mechanical performance, e.g. a tensile strength of 30 kg / cm ² and a relative elongation of 300%, rendering them unusable at high loads.

It is also known from patent application JP 2004277687 (A) for the use of nanocarbon particles of raw tire waste material because they contain additives to improve the mechanical properties of the tires and remain in the waste as they are. However, nanocarbon scrap particles according to the cited application contain impurities and therefore do not contribute to improving the quality of the finished product when used as a polymer additive.

The technical nature of the utility model

The object of the utility model is to provide a carbon black additive for carbon-based rubber obtained by vacuum pyrolysis of end-of-life tires, which, upon incorporation into the rubber mixtures, produces products with high mechanical properties. In essence, the additive for polymer products has the composition as follows (wt.%):

- carbon from 5 to 95%;

- ash from 0.1 to 16%;

- total sulfur from 0,1 to 3%;

- silica from 5 to 70%;

zinc oxide from 0.11 to 4.5%;

- calcium oxide from 0.11 to 1%;

- Diesel iron trioxide from 0.11 to 1%;

- alumina from 0.1 to 1%;

- magnesium oxide from 0.1 to 1%;

- total moisture content of 0,01 to 3%.

The polymer product additive according to the present utility model has a specific fraction size of 22 to 150 nm.

Embedded in rubber mixtures, the additive for polymer products, according to the utility model, results in transverse composites, resulting in a tensile strength, modulus of elasticity and relative elongation of the finished product repeatedly.

Thus, compared to pure butadiene-styrene rubber vulcanizate having a tensile strength (Rm) of not more than 1.5 MPa and at almost symbolic tensile strength (Fmax), the incorporation of 50 parts by weight of the additive according to the utility model, to 100 parts by weight of the rubber mixture results in values of Rm and Fmax of 12.95 MPa and 290.09, respectively. Other indicators such as modulus of elasticity (E) and relative elongation (ε%) are also dramatically increased.

According to the utility model, the additive for rubber mixtures allows it to be applied in a ratio of 10 to 300 parts by weight to 100 parts by weight of the rubber mixture. Experimental data on the amount of additive added to the rubber mixture show that the incorporation of more than 70 parts by weight of the additive over 100 parts by weight of the rubber mixture causes a deterioration in the quality of the finished product. Such products, however, find their application in construction, agriculture and the production of household goods, where high values of mechanical performance are not required.

The utility model is illustrated by the following exemplary embodiments without limitation

1642 ΌΙ its scope.

Example 1. In one embodiment, the rubber blend additive according to the utility model contains (in wt.%) Carbon 81.88; ash 15.6; total sulfur 2.9; silica 6.08; zinc oxide 4.02; calcium oxide 0.75; diesel iron 0.91; alumina 0.22 and magnesium oxide 0.14. The fraction size is from 65 to 100 nm and the total moisture content is 2.8%.

The method of producing the additive according to the present utility model envisages the use of solid waste (carbon black) obtained by vacuum pyrolysis of end-of-life tires as raw material for the preparation of the additive. For this purpose, the latter is pre-treated with textile waste and coarse particles, not destructed by the process of pyrolysis by means of a separator, and the resulting product is subjected to treatment with a magnetic separator with a view to removing metal impurities with subsequent repeated micronization to complete processing of the solid residue and reaching the size of the fraction from 22 to 150 nm without removing the initially filled tires.

The raw material processed above is the additive for rubber mixtures according to the utility model.

EXAMPLE 2 Application of a Rubber Mixture Additive for the Preparation of 5-Butadiene-Nitrile Rubber vulcanizate.

The rubber admixture according to the utility model is used to prepare a polymer product. For this purpose, the composition as in Example 1 is added to the starting rubber 10 mixture together with activators, accelerators, vulcanizing agents and plasticizers, the amount of which is not more than 20 parts per 100 parts by weight of butadiene-nitrile rubber.

The data from studies of the mechanical 15 indices of the resulting polymeric product at different feed additive ratios according to the utility model are summarized in Table 1 below, where;

Sample C0 is a rubber compound based on 20 butadiene nitrile rubbers without additive; Sample C50 - with 50 parts by weight of the additive to 100 parts by weight of the rubber mixture; Sample C60 - with 60 parts by weight of the admixture to 100 parts by weight of the rubber compound and Sample C70 with 70 mass parts by 25 parts of the admixture to 100 parts by weight of the rubber mixture and where the designations are as follows; Rm - tensile strength; E - modulus of elasticity and ε% - relative elongation.

Table 1

No Sample Rm (MPa) E (MPa) ε% 1. CO., LTD 1,75 1.52 270.72 2. C50 10.57 1.12 994,86 3. C60 13.60 1.33 1126,35 4. C70 12.57 1,975 th most common 709,57

The vulcanization characteristics of rubber mixtures based on butadiene nitrile rubber are determined on a MONSANTO rheometer at a temperature T = 160 ° C and are given in Table 2, where:

ML is the minimum torque; MH is maximum torque and T90 is the optimum time for vulcanization.

Table 2

N9 Sample ML (dNm) MH (dNm) T90 1. CO., LTD 0.54 14,42 6 minutes and 38 seconds 2. C50 1,20 22,26 6 minutes and 25 seconds 3. C60 1.54 23,49 7 minutes and 54 seconds 4. C70 1.91 24.76 7 minutes and 24 seconds

Due to the high tensile strength and elongation values, butadiene-nitrile rubber vulcanizates can be used in pneumatics and hydraulics where increased gas and oil resistance is required.

EXAMPLE 3 Application of a Rubber Mixture Supplement for the Preparation of 20 Butadiene Styrene Rubber vulcanizate.

The additive for the rubber mixtures according to the utility model is used to prepare vulcanizate based on butadiene styrene rubber. For this purpose, the composition as in Example 1 was added 25 to the starting rubber mixture together with activators, accelerators, vulcanizing agents and plasticizers.

Data from studies of the mechanical properties of the resulting polymer product at different feed additive ratios according to the utility model are summarized in Table 3 below, where the CO sample is vulcanized on the basis of butadiene-styrene rubber without additive; Sample C50 - with 50 parts by weight additive to 100 parts by weight of rubber mixture; Sample C60 with 60 parts by weight additive to 100 parts by weight of the rubber compound and Sample C70 with 70 parts by weight additive to 100 parts by weight of the rubber mixture and where the indications are as follows: Rm - tensile strength; E is the modulus of elasticity and ε% is the relative elongation.

Table 3

No Sample Rm (MPa) E (MPa) ε% 1. CO., LTD 1,25 1,75 133.46 2. C50 12.95 1.83 596.09 3. C60 15.57 1.98 672,19 4. C70 15.66 2.02 713,62

The vulcanization characteristics of rubber mixtures based on butadiene styrene rubber are determined on a MONSANTO rheometer at a temperature T = 160 ° C and are given in Table 4, where:

ML is the minimum torque; MH is maximum torque and T90 is the optimum time for vulcanization.

The high values of the indicators shown in Table 3 allow the use of the rubber mixtures obtained according to this utility model to be used for the production of technical rubber articles and for the production of pneumatic solid and retreaded tires.

Table 4

N2 Sample ML (cWm) MH (dNm) T90 1. CO., LTD 0.88 13,54 13 minutes and 20 seconds 2. C50 1.89 21.39 8 min and 09 sec 3 C60 2.42 24,96 7 minutes and 49 seconds 4. C70 2.45 25,47 7 minutes and 57 seconds

Example 4. Application of the admixture for rubber mixtures for the preparation of ethylene propylene rubber vulcanizate

The data from studies of the mechanical properties of the polymer product obtained at a different ratio of the feed additive, according to the utility model, to the ethylene propylene rubber based vulcanizate are summarized in Table 5 below, where the CO sample is vul15 ethylene propylene rubber canisate no additive; Sample C50 - with 50 parts by weight of addition to 100 parts by weight of rubber mixture; Sample C60 with 60 parts by weight of the admixture to 100 parts by weight of the rubber compound and Sample C70 with 70 parts by weight of the admixture to 100 parts by weight of the rubber mixture and where the indications are as follows: Rm - tensile strength; E - modulus of elasticity and ε% - relative elongation.

Table 5

No Sample Rm (MPa) E (MPa) ε% 1. CO., LTD 1,25 1.32 75.54 2. C50 9.95 1.44 449,29 3. C60 12,84 1.69 520.34 4. C70 11,95 1.63 560.08

The vulcanization characteristics of ethylene propylene rubber based rubber mixtures were determined on a MONSANTO rheometer at a temperature of T = 160 ° C and are given in Table 6 below, where:

ML is the minimum torque; MH maximum torque and T90 - optimum curing time.

Table 6

No Sample ML (dNm) MH (cWm) T90 1. CO., LTD 1.09 16.58 16 minutes and 30 seconds 2. C50 2.01 26.69 13 minutes and 14 seconds 3. C60 2.70 31.14 13 min and 07 sec 4. C70 2.49 29.83 13 min and 01 sec

Ethylene propylene rubber based vulcanizates are applicable in industry and agriculture, and in cases where increased weather resistance, ozone resistance and resistance to corrosive chemical products are required.

Claims (2)

Claims 1. Rubber mixture based on carbon black obtained after vacuum pyrolysis of end-of-life tires, characterized in that it contains (by weight%): carbon from 5 to 95; ash from 0.1 to 16; total sulfur from 0.1 to 3; silica from 5 to 70; zinc oxide from 0.11 to 4.5; calcium oxide from 0.11 to 1; diesel iron trioxide from 0.11 to 1; alumina from 0.1 to 1; magnesium oxide from 0.1 to 1, with a total moisture content of 0.01 to 3%. 2. Rubber-based polymeric product comprising the additive according to claim 1 in an amount of from 10 to 300% by weight. hours against 100 wt. including rubber compound.