PL210521B1 - Elastomeric composition intended for rubber products with curing temperature below 100ºC - Google Patents

Description

The subject of the invention is an elastomer composition for rubber products with a vulcanization temperature below 100 ° C.

Until now, sulfur crosslinkers or peroxides have been used as a crosslinker in elastomeric compositions for rubber products, containing styrene-butadiene rubber, a filler, a crosslinker and auxiliaries. These compositions are vulcanized at temperatures above 100 ° C.

Elastomer composition intended for rubber products, containing butadiene-styrene rubber, a filler in the form of pyrogenic silica or active carbon black in an amount of 15-60 parts by weight per 100 parts by weight of rubber, auxiliary substances, including dispersant, in an amount of 0.5-5 parts each According to the invention, the cross-linkers contain a redox system in which the oxidant is cumene hydroperoxide in an amount of 2-10 parts by weight per 100 parts by weight of rubber, and the reducing agent is vanadium acetylacetonate, nickel acetylacetonate or iron acetylacetonate, in an amount of 0.1-2 parts by weight per 100 parts by weight of rubber.

The composition according to the invention can be prepared with processing equipment commonly used in rubber technology. This composition crosslinks at temperatures below 100 ° C and furthermore shows good mechanical and rheometric properties.

The following examples illustrate the subject matter of the invention.

P r z k ł a d I

A composition was prepared with the composition in parts by weight:

styrene-butadiene rubber - 100 parts, cumene hydroperoxide - 8 parts, vanadium acetylacetonate - 0.2 parts, pyrogenic silica - 30 parts, triethanolamine - 3 parts, and the rheometric properties of the above rubber mixture were examined. Then, a sample was vulcanized from this composition at the temperature of 80 ° C for 3.7 hours, and its mechanical properties were examined: tensile strength and elongation at break, before and after the aging process. At the same time, for comparative purposes, a composition was prepared with the composition in parts by weight:

styrene-butadiene rubber - 100 parts, cumene hydroperoxide - 8 parts, vanadium acetylacetonate - 0.2 parts, and the rheometric properties of this mixture were examined. Then, from this composition, a sample was vulcanized at the temperature of 80 ° C for 3.7 hours, and its mechanical properties were tested: tensile strength and elongation at break, before and after the aging process.

P r z x l a d II

The composition was prepared in parts by weight: styrene butadiene rubber - 100 parts, cumene hydroperoxide - 8 parts, iron acetylacetonate - 0.2 parts, pyrogenic silica - 30 parts, triethanolamine - 3 parts.

The next step was as in Example 1. Vulcanization was carried out at the temperature of 80 ° C for 4.7 hours. At the same time, for comparison purposes, a composition was prepared with the composition in parts by weight:

styrene-butadiene rubber - 100 parts, cumene hydroperoxide - 8 parts, iron acetylacetonate - 0.2 parts.

The next step was as in Example 1. Vulcanization was carried out at the temperature of 80 ° C for 4.7 hours.

P r x l a d III

A composition was prepared with the composition in parts by weight: styrene-butadiene rubber - 100 parts,

PL 210 521 B1 cumene hydroperoxide nickel acetylacetonate, pyrogenic silica triethanolamine 10 parts, 0.2 parts, 30 parts, parts.

The next step was as in Example 1. Vulcanization was carried out at a temperature of 80 ° C for 7.2 hours. At the same time, for comparative purposes, a composition was prepared with the composition in parts by weight:

styrene-butadiene rubber - 100 parts, cumene hydroperoxide - 10 parts, nickel acetylacetonate - 0.2 parts.

The next step was as in Example 1. Vulcanization was carried out at the temperature of 80 ° C for 7.2 hours.

P r x l a d IV

The composition was prepared in parts by weight: styrene-butadiene rubber - 100 parts, cumene hydroperoxide - 4 parts, vanadium acetylacetonate - 0.2 parts, active carbon black - 30 parts, naphtholene - 3 parts.

The next step was as in Example 1. Vulcanization was carried out at the temperature of 80 ° C for 3.7 hours. At the same time, for comparison purposes, a composition was prepared with the composition in parts by weight:

styrene-butadiene rubber - 100 parts, cumene hydroperoxide - 4 parts, vanadium acetylacetonate - 0.2 parts.

The next step was as in Example 1. Vulcanization was carried out at the temperature of 80 ° C for 3.7 hours.

P r z k ł a d V

The composition was prepared in parts by weight: styrene-butadiene rubber - 100 parts, cumene hydroperoxide - 6 parts, iron acetylacetonate - 0.2 parts, active carbon black - 30 parts, naphtholene - 3 parts.

The next step was as in Example 1. Vulcanization was carried out at the temperature of 80 ° C for 4.7 hours. At the same time, for comparison purposes, a composition was prepared with the composition in parts by weight:

styrene-butadiene rubber - 100 parts, cumene hydroperoxide - 6 parts, iron acetylacetonate - 0.2 parts.

The next step was as in Example 1. Vulcanization was carried out at the temperature of 80 ° C for 4.7 hours.

P r x l a d VI

The composition was prepared in parts by weight: styrene butadiene rubber - 100 parts, cumene hydroperoxide - 6 parts, nickel acetylacetonate - 0.2 parts, active carbon black - 30 parts, naphtholene - 3 parts.

The next step was as in Example 1. Vulcanization was carried out at a temperature of 80 ° C for 7.2 hours. At the same time, for comparative purposes, a composition was prepared with the composition in parts by weight:

styrene-butadiene rubber - 100 parts, cumene hydroperoxide - 6 parts, nickel acetylacetonate - 0.2 parts.

PL 210 521 B1

The next procedure was as in Example I. Vulcanization was carried out at a temperature of 80 ° C for 7.2 hours. Test results for rheometric and mechanical properties (tensile strength and elongation at break) of the samples obtained in Examples 1-6 are shown in Tables 1 and 2 below.

T a b l i c a 1

Mechanical properties of the elastomer compositions obtained in Examples 1-6, before and after aging

Example No. Vulcanizates before the UV aging process Vulcanizates after UV aging Aging factor (TS EB) pouv ^{(TS EB)} before UV TS [MPa] EB [%] TS [MPa] EB [%] Example I 8.23 892 7.85 934 1.00 Example II 7.02 1075 8.56 988 1.12 Example III 7.59 1079 8.25 947 0.95 Example IV 4.83 249 2.77 417 0.96 Example V 7.98 376 6.41 344 0.73 Example VI 7.79 508 7.31 550 1.02

TS - tensile strength

EB - means the relative elongation of the measuring section at the moment of breakage

T a b l i c a 2

Rheometric properties of the elastomer compositions obtained in Examples 1-6, tested at 120 ° C

Example No. Mmin [dNm] AM [dNm] T0.9 [min] T0.2 [min] Example I 62.1 50.4 48.8 3.5 Example II 52.9 68.3 112.6 2.7 Example III 54.4 65.0 108.1 6.0 Example IV 38.9 21.9 16.6 1.4 Example V 30.9 59.9 49.9 2.4 Example VI 22.5 41.6 44.1 2.2

Mmin - means the minimum torque

ΔΜ - means the increase of the torque τ0.9 - means the vulcanization time τ0.2 - means the scorch time

Claims (1)

Elastomer composition intended for rubber products, containing butadiene-styrene rubber, a filler in the form of pyrogenic silica or active carbon black in the amount of 15-60 parts by weight per 100 parts by weight of rubber, auxiliary substances, including dispersant, in an amount of 0.5-5 parts each by weight per 100 parts by weight of rubber and cross-linkers, characterized in that the cross-linkers are a redox system, in which the oxidant is cumene hydroperoxide in an amount of 2-10 parts by weight per 100 parts by weight of rubber, and the reducing agent is vanadium acetylacetonate, nickel acetylacetonate or iron acetylacetonate, in an amount of 0.1-2 parts by weight per 100 parts by weight of rubber.