SU802319A1 - Vulcanized composition based on low-molecular weight unsaturated rubber - Google Patents

Description

(54) VOLCANIZABLE COMPOSITION. BASED ON

LOW MOLECULAR UNLIMITED RUBBER

The invention relates to rubber industry, in particular to the development of a vulcanizable composition based on low molecular weight unsaturated rubber. A vulcanizable composition based on low molecular weight unsaturated rubber is known, including the quinolide ester of p-quinondioxime and 2,4,6-trisubstituted phenol in a ratio of 100: 2-7 1}. However, rubber from this mixture have low strength properties. The purpose of the invention is to improve the strength properties while maintaining the value of the relative elongation of rubber from this mixture. This goal is achieved by the fact that a vulcanizable composition based on low molecular weight unsaturated rubber, including the quinolide ester of p-quinondoxime and 2.4, b-trisubstituted phenol, additionally contains a sligomer 1 - ((5-vinyloxyethoxy) propylene oxide-2, 3 in the following ratio of components, parts by weight: Low molecular weight, unsaturated rubber100 Quinoline ester of p-quinone dioxime and 2,4,6-trisubstituted phenolA (CEF) 2-7 Oligomer 1- ((i-vinyloxyethoxy) propylene oxide-2, 3. (HPV) 3-30 As the basis of the composition, use any low molecular weight Limit rubbers: gazolepolimery and copolymers, with or without functional groups, such as polybutadiene, prliisoprene, polybutadiene with graft ECHI carboxyl groups, etc. Vulcanizable composition may contain p-quinone dioxime quinolide ester and 2,4,6-trisubstituted phenol as a vulcan extract. in combination with sulfur, taken in an amount of 0.1-0.5 parts by weight (preferably 0.40 b.h. parts) per 1 part by weight of HEF. The invention is illustrated by the following examples. Example 1. Preparing four mixtures based on cis-1,4-polybutadiene with grafted carboxyl groups; carboxyl group content is 2.5% 1 with viscosity at 1400 pz of the following composition, parts: Rubber: KEPUK100.0 HEF-15.0 gpvz; 5; l0 20 For comparison, a control mixture is prepared without the addition of HPW. The ingredients are mixed on a laboratory roll at room temperature for 15 min. The mixture is evacuated for 2 hours at room temperature and a residual pressure of 2.5 mm Hg. Curing is carried out at 12 days time to plateau). The number of HPV and the results of the physicomechanical tests of 1t vulcanization are given in Table. 1. Example 2. Three mixtures based on cis-1,4-polybutadiene with grafted carboxyl groups (content of carboxyl groups 2.5 with viscosity at 50 ° C, 1,400 pz of the following composition, weight parts: 100.0 HEP-1 rubber 5.0 per 1 part by weight Sulfur 2,0 weight 4. HEF-1 10, o; 20, o; dh, HPV For comparison, a control mixture without the addition of HPV is prepared. The number of HPWs and the results of the physico-mechanical tests of the volcanoes are given in Table 2. Examples: 3 mixtures are prepared based on cis-1,4-polybutadiene with a viscosity of 7100 pz following composition, EC: Rubber 100.0 HEF-15.0 Sulfur 2.0 GWP10, o; 20, O; so For comparison, one control mixture is prepared without the addition of HPV. The mixture is prepared and vulcanized, as in Example 1. Quantity HPV, the curing time and the results of physico-mechanical tests of vulcanizates are given in Table 3. The properties of

3 5

10 20

URM - conditional equilibrium module. Example 4. Preparing a mixture according to the same formulation and technology as in Example 3, with 30 parts by weight. HPV, but based on polyisoprene with a viscosity at 50 s 3000 pz and a control mixture based on this rubber without the addition of HPV. The number of HPV, curing time and the results of physico-mechanical tests of vulcanizates are given in Table. 3. As can be seen from Examples (Tables 1 through 3), the introduction of oligomer 1- (p-vinyloxyethoxy) propylene oxide-2,3 (HPV) in a composition based on low molecular weight unsaturated rubbers containing the quinolide esters of p-heinondioxime as a vulcanizing agent and 2,4,6-trisubstituted phenols (HEP) or HEP in combination with sulfur allows to increase the strength of vulcanizates by 2 times while maintaining the value of relative elongation. In addition, in compositions using HEF as a curing agent in combination with sulfur, the addition of HPV accelerates the curing process (see Table 2, 3). In the case of using as a base a composition of rubbers that do not contain carboxyl groups, for example polybutadiene or polyisoprene, HPV is also a non-migrating plasticizer (additional effect). So, the introduction of 30 weight.h. HPV (see Table 3) leads to a decrease in the viscosity of the composition by 1.6-3.7 times for polyisoprene and polybutadiene, respectively. During curing of the plasticized rubber, a complete plasticizer filing to the polymer network is observed: the sol fraction fraction of the unplasticized and plasticized vulcanizates is the same, while the strength properties of the vulcanizates are improved (see Table 3). Table 1 t dosage of HPV Properties of rubber from the dosage of HPV and time

Rubber properties

Table Table 2 vulcanization.

Claims (3)

SUMMARY OF THE INVENTION ° A vulcanizable composition based on a lower molecular weight unsaturated rubber, including the quinolide ester of η-quinondioxime and 2,4,6-trisubstituted phenol, is characterized in that in order to improve the strength properties while maintaining the relative elongation of rubbers from this mixture, the latter further comprises an oligomer of 1- (β-vinyloxyethoxy) propylene oxide-2, 3, 55 in the following ratio of components, parts by weight: 100 2-7 3-30 Low molecular weight unsaturated rubber Quinolide ester of η-quinondioxime and 2,4,6-trisubstituted phenol Oligomer 1 - ((3-vinyloxyethoxy) propylene oxide-2,3