SU771122A1 - Vulcanized rubber mixture based on dienic rubber - Google Patents

Description

The invention relates to the rubber industry, in particular to the development of a vulcanizable rubber mixture based on diene rubber. A vulcanizable rubber mixture based on a diene rubber is known, which includes a modifying additive, such as a mixture of resotropic CPU-1) with an alkylphenol resin (aloformed condensate of alkylated two atomic phenols with a formaldehyde donor and amines) in an appropriate ratio. 100: 1-2 tl-5 l. The rubbers from this mixture are characterized by unsatisfactory heat resistance. The purpose of the invention is to improve the heat resistance of rubber. The goal is achieved by the fact that a vulcanizable rubber mixture based on a diene rubber, including an alkylphenol resin modifying additive, as the latter contains the product of the interaction of the precondensate of alkylated diatomic phenols, the donor forms of aldehyde and amines alrophoric with piperylene hydrochloride (GHP) and alternatively, and optionally and optionally and optionally aldehyde amines. APA) when the ratio of the latter to the specified product of interaction is 1: 1 and the components of the mixture are taken in the following quantity, parts: Rubber: 100 The specified product is mutual and action 1-3 Anhydroformaldehydaniline 1-3 The product of the interaction of alrophor and HCP is a viscous mass of brown without any foreign smell. Example. A three-necked flask with a stirrer, a reflux condenser and a venting tube dipped into a flask with water to absorb the liberated gaseous hydrogen chloride was charged with 60 g of alrophor, then 62.7 g of HCP was added at the rate of 1 mole of alrophor and 3 mole of HCP. The contents of the flask are heated in a water bath in a stream of inert argon gas in order to displace the hydrogen chloride formed. The termination of the reaction is judged by discontinuation of the hydrogen chloride from the reaction mass.

As a result of the reaction, the product of the interaction of alrophore with HCP is obtained - a viscous, brown, odorless mass.

The resulting product is mixed in a 1: 1 molar ratio with AFA.

The heat resistance of the products obtained is determined in the derivator of the Paulík – Paulík Erdey system. They are heated to

Decomposition and condensation of the obtained product and its mixture with AFA to the composition of the mixture (parts by weight)

increases in the temperature range of 150160 ° C, with the amount of volatiles being less than 1%, while decomposition and condensation of RU-1 and RU-1 + system alrophore begins at

il25-130C, the amount of volatiles is 7-10%.

The rubber mixture is prepared in a laboratory rubber mixer with a two-stage mixing. The recipe of the mixture is given in table. one.

Table 1

80.0 80

20, 0 20 20 20 20 2.1 2.2 2.2 2.2 2.2 1.0 1.0 1.2 1.2 1.2 1.2 1.2

80

80

80

2.0 2 2

1.5 0.75 0, 75 1, 5

The rubbers, fillers, oil PN-B, alrophore, and the product of interaction with GHP in a mixture with AFA are administered in 1 stage.

Sulfur boosters, RU-1. on p herd mix.

The mixing temperature at stage 1, at the stage of 90-110 ° C.

An increase in the content of APA in this mixture leads to a sharp decrease in

with static compression

scorch time. So, when the ratio of the AFA and the product of the interaction between the alrophore and GHP is 1: 1, the scorching time is 20 min, and at the 1: 2 ratio this parameter is 10 min, which leads to the scaling of rubber compounds.

Properties of mixtures and rubbers of them are presented in table. 2

table 2

221

239

230

228

As can be seen from the table. 2, the vulcanizates obtained using the proposed modifier are not inferior in their properties to the prototype vulcanizates, which will eliminate the deficient modifier RU-1 from the rubber compounding. This will lead to cheaper rubber compounds.

In addition, the product of the interaction of alrophore and GHP, mixed with AFA, does not regulate the volatility inherent in serial RU-1 and alrophore. The heat resistance of the rubber compound also increases. This is indicated by such an indicator as creep, it decreases by 23%, endurance increases by repeated stretching by 11%.

Claims (1)

Invention Formula Vulcanized rubber mixture based on diene rubber, including modifying agent .- alkylphenol resin, characterized in that, in order to increase the heat resistance of rubber from this mixture, the latter contains as an alkylphenol resin the product of the interaction of the precondensate of alkyl diatomic phenols, the formaldehyde donor and amines with piperylene hydrochloride and additionally anhydro-formaldehyde anhydride in the middle of the mixture. 1: 1 interaction product and the components of the mixture are taken in the following quantity, parts by weight: Rubber100 The specified product of the interaction 1-3 Anhydroformaldehydaniline 1-3 Sources of information taken into account in the examination 0 1. USSR Copyright Certificate №394352, cl. C 08 L 9/00, 02.07.71.