SU891707A1 - Rubber mixture based on unsaturated rubber - Google Patents

Description

(54) RUBBER-BASED MIXTURE, 1 - The invention relates to the processing of unsaturated elastomers and can be used in rubber and tire industries, as well as in adjacent-pre-types, which use rubber compounds in production. . : To facilitate the processing of rubber mixtures, ingredients are removed in them, for example, a softener and scorch retarder, which improve the processing properties of the mixture and resistance to scorch. A known rubber compound based on Yenas rubber (elastomer) containing a vulcanization agent, an accelerator, a dispersant, an activator filler, an antioxidant and a scorch retarder, such as ft left anhydride, as well as a softener such as gum rosin, by weight. including: 100: 1,5: 1,5: 1: 4: 50: 2: 1-3 tl. However, the well-known rubber mixture is characterized by insufficient resistance to scorching and low cohesion strength, and rubber, obtained on its basis, have unsatisfactory resistance to heat aging, which is connected with the UNSATURATED POWER increased resistance of rosin to oxidation. Rosin, which is a part of a known rubber mixture, is an expensive scarce product obtained from vegetable raw materials, and phthalic anhydride, being a substance with a relatively high melting point (130-131 ° C) and polarity, is poorly distributed in the mixture and fades on surface storage rubber compound. The purpose of the invention is to improve the quality of the rubber mixture, and that is; increasing the resistance of the rubber mixture to scorch and improving its cohesive strength, as well as the physical and mechanical properties of rubber from this mixture. The goal is achieved by the fact that a rubber mixture based on unsaturated rubber, including a vulcanization agent, an accelerator, a dispersant, an activator, a filler, an antioxidant and a scorch retarder, contains as the last product copolymerization of piperylene and 3-methyl 1,2,3,6 tetrahydrophthalic anhydride in the following ratio of components, May. including:

Unsaturated rubber

Vulcanization agent

Accelerator

Dispersant

Activator

Filler

Antioxidant

Scorch retarder1, 0-5.0

The product is copolymeted with piperylene and 3-methyl-1,2, -3,6-tetrahydrophthalic anhydride (v-THPA resin) is obtained as a waste in the production of 3-methyl-1,2,3 / 6-tetrahydrophthalic anhydride in the amount of 10% of the main products. Resin resources are about 20 tons per year according to the FPIC.

ZMTGFA resin is a hard, fragile, translucent product of light brown color with the following characteristic:

Molecular weight 400-480 Density, g / cm 1.12-1.16 Softening temperature, ° С70-90 Volatile content,%. 2-2.5 Ash content,% 0.05-1.0 The content is insignificance-. Roman acid in acetone,% 0.2-0.6 Acid number, mg KOH / i 370-420 According to spectral analysis, the composition of the ZMTHPA resin consists of compounds containing anhydrite groups and unsaturated units. Having a relatively low softening temperature, the ZMTGFA resin mixes well with rubber and eliminates incoherence of heterogeneity due to poor distribution in the manufacture of the mixture.

A sample of the ZMTGFL resin was subjected to laboratory tests in the composition of rubber compounds as a retardant for scorching and softening, with the following indicators:

Molecular weight 443 Density V g / cm 1.15 Softening temperature, ° С85.0 Volatile content,% 2.22 Ash content,% 0.07 Insoluble content in acetone,% 0.40 Acid number, mg KOH / H396 This resin also serves as a softener. Therefore, there is no need to use rosin in the mixture.

The manufacture of rubber compounds containing resin ZMTGFA proceeded without complications, no technological difficulties were observed. A slightly increased adhesiveness to the metal and increased cohesive properties of rubber compounds were visually noted.

Testing of the resin as a scorch retardant (anti-scorching) and as a softener was carried out as part of specific rubber mixtures based on various 5 tows and for various purposes. Serial rubber compounds containing rosin and phthalic anhydride in optimal dosages (1.5 and 0.5 May. Hours per

May 100 rubber, respectively).

Example 1. A lining rubber mixture is prepared for the composition, wt.: SKI - 3,100 rubber, sulfur 2.4, sulfenamide 1.1, altax 0.2, RU modifier 1.00, resin Lrafort 5 1.00, zinc white 5, stearin 2, oil PN-6 3, Rubrake 4, carbon black 50, neozon D 1.00, diafen OP 1.00, phthalic anhydride 0.5, rosin 1.5 (known) and containing as anti-scorching and mchitel 1.5 May. h. resin ZMTGFA (proposed).

Example 2. A lining rubber mixture was prepared according to Example 1-5 (Known) and a mixture containing anti-scorching and softening was 2.0 May. h. resin ZMTGFA (proposed).

The time before the beginning of the sub-vulcanisation at 120 s is determined, during which the viscosity of the rubber mixture is increased by 5 units against the minimum, and the cohesive properties of the rubber mixture, as well as the main physical and mechanical parameters in the optimum vulcanization.

The properties of mixtures and vulcanizates are given in table. one.

Prize, Preparing a tread rubber compound of composition, 0 wt.h .: SKD 30 rubber, SKSOARCM 70 rubber, 1.7 sulfur, 1.45 sulfenamide, zinc white 3, dia $ en OP 1, oleic acid 2, oil PN- 6 14.5, rubrax 3, microwave of pollutants 2, 5 three-carbon PM - 100 60, phthalic anhydride 0.5, rosin 1.5 (known) and a mixture containing 3.0 mash as anti-scorching. Emoly ZMTGFA (proposed). l Example 4. Prepare a rubber bottle according to example 3 (known), and a mixture containing 5.0 mash as anti-scorching and softener. ZMTGFA resin (proposed).

The time before the start of the cannization at 120 s and the resistance of rubber to heat aging for 72 hours are determined in relation to the strength and relative elongation of the rubber after aging to the original values (before aging).

The properties of mixtures and vulcanizates are given in table. 2

From tab. 1 and 2 it can be seen that the proposed mixtures in comparison with the known 5 have elevated indicators

resistance to scorching, cohesive strength, which is very important for abrasive rubber / vulcanization. These are characterized by a higher resistance to heat aging. The scorch resistance increases by 10–30%, the relative elimination at break of the rubber slyu increases by 70–90%, and the resistance to heat aging of the rubber increases by 20% in strength and 5–20% in relative elongation. At present, the ZMTGFA resin does not find qualified use and is being destroyed. The proposed technical solution will allow solving the problem of disposing of one of the petrochemical wastes, which is contaminated with them and the environment.

The ZMTGFA resin performs a bifunctional role - softening and anti-scoring simultaneously. This will not only improve the quality of rubber compounds, but also reduce their cost by replacing expensive and scarce rosin and phthalic anhydride with

almost a waste product.

I

Table 1

Indicators Time before the start of scorching, min Cohesion properties: modular at 300% elongation, kg / cm elongation,% Module at 300% elongation, kg / cm88 Tear resistance, kg / cm240 Elongation,% 600 Residual elongation,% 31 Resistance tear, kg / cm85

Known

We offer a mixture with resin ZMTGF mixture

1.5 ma.ch.

2, About.

Properties of mixtures 21 1.1 640 Properties woo 1 22.5 1.2 1070 in

Indicators

Carrer Plasticity

Time ds start scorch, min

Thermal aging coefficient

Rubber mixture based on unsaturated rubber, including a vulcanization agent, an accelerator / dispersant, an activator, a filler, an antioxidant, and a vulcanization retarder, characterized in that in order to increase the resistance of the rubber mixture to vulcanization and improve its cohesive strength, and physicomechanical properties of rubbers, from this mixture, the latter contains copolymer of piperylene and 3 methyl - 1,2,3,6 - tetrahydrophthalic acid as a retardant. Table 2

We offer a mixture

Known with ZMTGFA resin mix

3me.h.

5 ma.ch.

Blend properties

0.41

0.44

0.42

27

thirty

27

Properties, volcanic eats.

Research Institute of Components, May. including:

Nenas1ltsvi 1Id rubber 100 Vulcanization agent 1-3

Uskortel 1,5-4,5

Dkspergator0,2-3,0

Activator2.0-10.0

Filler20-85

Protivstefitel 0,5-3,0 The specified retarder

scorch1,0-5,0

Sources of information taken into account during the examination

1. Handbook of rubber. N., Himi, 1971, p. 126 {prototype).

Claims (1)

Claim A rubber mixture based on unsaturated rubber, including a vulcanization agent, accelerator, dispersant. Tor., Activator, filler, antioxidant and retardation retarder, characterized in that, in order to increase the resistance of the rubber compound to vulcanization and improve its cohesive strength, as well as the physicomechanical properties of rubbers from this mixture, the latter contains ¹ as a retarder, a piperylene copolymer and 3 to ⁹ methyl - 1,2,3,6 - tetrahydrophthalene - 0.80 0.95 0.94 0.48 0.57 0.50 57 ⁵⁵ 53 31 32 32 go anhydride in the following ratio of components, May. hours: Unbearable rubber 100 Vulcanization agent 1-3 Accelerator 1,5-4,5 Dispersant 0.2-3.0 Activator 2.0-10.0 Filler 20-85 Anti-aging agent 0.5-3.0 Specified Moderator volcanoes 1.0-5.0