RU2304603C1 - Glue composition - Google Patents

Abstract

FIELD: tire industry; mechanical rubber industry; production of the glue composition.

SUBSTANCE: the invention is pertaining to the glue composition made on the basis of the chloroprene rubbers and may be used in the tire industry and the mechanical rubber industry. The engineering problem of the invention is to increase adhesiveness and the holding power of the rubber mixture on the basis of the chloroprene rubber to the rubber-coated cord made out of the rubber mixture on the basis of the general-purpose rubbers. The given problem is solved due to the fact, that the mixture contains the chloroprene rubber, zinc oxide, nephras and the ethyl-acetate, and it additionally contains the heightened contents of the colophony and the colloidal silicic acid and also the molecular complex of resorcinol with urotropine, with the stabilizing agent and the plasticizer.

EFFECT: the invention ensures the increased adhesiveness and the holding power of the rubber mixture on the basis of the chloroprene rubber to the rubber-coated cord made out of the rubber mixture on the basis of the general-purpose rubbers.

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Description

The invention relates to a polymer-based adhesive composition and can be used in the tire and rubber industries in the manufacture of multilayer rubber-fabric products, in particular rubber-cord casings and pneumatic tires, high-pressure flexible hoses, especially oil and petrol-resistant, when used in aggressive environments.

Known adhesive composition (see D. A. Kardashov "Synthetic adhesives", M .: Chemistry, 1976, 276-277) based on chloroprene rubber-nairite, soluble in a mixture of ethyl acetate and gasoline, used for bonding unvulcanized rubbers and rubber-fabric materials based on nitrile butadiene rubber followed by vulcanization.

A disadvantage of the known adhesive composition is its relatively high density and low oil and gas resistance.

An adhesive composition is also known (see SU a.s. No. 1807067, IPC C09J 11/00, publ. 04/07/98, bull. No. 13), including chloroprene rubber, burnt magnesia, zinc oxide, sulfur, pine rosin, nephras and ethyl acetate, a 70% solution of trimethylolpropane, pentaerythritol or glycerin modified polyethylene terephthalate in ethyl acetate, used for bonding rubber-textile materials.

The disadvantage of this known composition is toxicity, lack of viability and the inability to use aggressive environments when destroying products.

The closest in technical essence and technical result achieved (prototype) is an adhesive composition (see SU a.s. No. 1645274 A1, publ. 04/30/1991, bull. No. 16), including chloroprene rubber, zinc oxide, rosin, dibutyl phthalate, colloidal silicic acid and the molecular complex of resorcinol with urotropine - RU, gasoline and ethyl acetate.

A disadvantage of the known prototype is a reduced confection stickiness due to the low concentration of rosin 4-6 wt.h. and as a result of this, the reduced fastening strength of the rubber compound based on toxic nitrile butadiene rubber to a cord rubberized with a rubber compound based on general purpose rubbers.

The objective of the invention is to eliminate these drawbacks, the creation of such an adhesive composition, the technical result of which is to increase the stickiness and fastening strength of the rubber compound based on environmentally friendly nitrile butadiene rubber to rubberized not only synthetic cord, but also rubberized metal cord rubber mixture based on general purpose rubbers , increasing the adhesive strength and oil resistance in the operation of the manufactured multilayer rubber-fabric products.

The technical result is achieved due to the fact that the adhesive composition, including chloroprene rubber, zinc oxide, gasoline and ethyl acetate, additionally contains an increased content of 40-60 wt.h. rosins and 60-80 parts by weight colloidal silicic acid, as well as the molecular complex of resorcinol with urotropine, with a stabilizer and plasticizer - RU-D - 40-60 wt.h. in the following ratio of components, parts by weight:

Chloroprene rubber one hundred Zinc oxide 4-6 Rosin 40-60 Resorcinol molecular complex with urotropin, with stabilizer and plasticizer - RU-D 40-60 Colloidal silicic acid 60-80 Nefras 277-285 Ethyl acetate 345-365

These components of the adhesive composition are produced by the domestic chemical industry.

The RU-D modifier according to TU 2494-011-00149452-99 is a non-dusting powdery homogeneous white product with a yellowish tint of interaction in the disintegrator of resorcinol and urotropin with the addition of a stabilizer and plasticizer, the molecular complex of which

Requirements for raw materials: urotropin according to GOST 1381; resorcinol according to GOST 9970, plasticizing additive - PN-6 oil according to TU 38.1011317, boric acid according to GOST 18704.

The increased content in the adhesive composition of pine rosin in the range of 40-60 wt.h. and the introduction into the adhesive composition of the molecular complex of resorcinol with urotropine, with a stabilizer and plasticizer RU-D - 40-60 wt.h. will increase the stickiness of the confection and the strength of the rubber compound based on environmentally friendly nitrile butadiene rubber to rubberized synthetic cord and metal cord. The stabilizer, which is part of the molecular complex, ensures the preservation of the necessary physical and mechanical properties and the bond strength of rubber-cord parts during the operation of the products.

An increased amount of colloidal silicic acid filler up to 80 parts by weight provides resistance of the multilayer product to the action of aggressive environments: gasoline, fuels and mineral oils. This increases the adhesive strength and stability during storage of the adhesive composition.

The rubber mixture for the adhesive composition is made in a standard way on the rollers. First, the loaded chloroprene rubber is treated on rollers, the analogue is Nairit DSR according to TU 6-01-1315-85, then, in a certain sequence, 1/3 of colloidal silicic acid is introduced three times, three times 1/3 of the RU-D molecular complex and at the end zinc oxide, mix thoroughly, after which the finished rubber mixture is unloaded and cooled.

The technological process for preparing the adhesive composition is as follows: the calculated amount of the prepared rubber mixture is loaded into a glue mixer with pine rosin (according to GOST 19113-84) for swelling for 3-4 hours in a mixture with ethyl acetate, and then the remainder of ethyl acetate and nefras are added and mixed for 2 , 0-2.5 hours

In the manufacture of multilayer rubber-cord products, parts of these products from rubber mixtures based on environmentally friendly nitrile butadiene rubber and their combination with chloroprene rubber (70:30 parts by weight) and synthetic cord and metal cord rubberized with a rubber compound based on general-purpose rubbers are lubricated the adhesive composition, followed by drying for 4-5 minutes and then a multilayer rubber cord product is assembled from these parts and vulcanized in the appropriate purpose of the product by vulcanization equipment and 150-160 ° C for 45-65 minutes

According to the specified technological process, the compositions of the proposed adhesive composition are manufactured, characterized by a quantitative ratio of components.

For comparison, the known and proposed adhesive compositions were tested according to existing methods. The compositions of the adhesive composition are shown in table 1.

Table 1
The composition of the known and proposed adhesive composition Ingredients Content by weight per 100 parts by weight rubber famous one 2 3 Chloroprene rubber one hundred one hundred one hundred one hundred Zinc oxide 5 5 5 5 Rosin 5 40 fifty 60 The molecular complex of resorcinol with urotropin 60 - - - Molecular complex of resorcinol with urotropin, with stabilizer and plasticizer, RU-D - 40 fifty 60 Colloidal silicic acid 60 80 70 60 Nefras 345 277 280 285 Ethyl acetate 345 345 350 365

table 2
The test results are presented in table 2 Indicators Adhesive composition Famous proposed one 2 3 1. The bond strength of the rubber compound based on 100 wt.h. rubber SKN-40SM to cord rubberized with rubber compound based on 100 parts by weight SKI-3, kN / m. 5,0 - - - 2. The bond strength of the rubber compound based on the environmentally friendly BNKS-40 AMN kuchuk to the cord. - 6.7 6.9 7.8 3. The concentration of solids,% 25.0 25.0 24.5 24.0 4. Storage stability, days 5 fifteen fifteen fifteen

The use of the adhesive composition according to the invention in multilayer rubber-cord products makes it possible to increase the bond strength between the layers of rubber-cord products and, as a result, increase the resistance to destruction during operation of rubber-cord products in aggressive environments: gasoline, fuel, mineral oils.

Claims (1)

An adhesive composition comprising chloroprene rubber, zinc oxide, nephras and ethyl acetate, characterized in that it contains an additionally high content of rosin and colloidal silicic acid, as well as the molecular complex of resorcinol with urotropine, with a stabilizer and plasticizer - RU-D in the following ratio, wt. hours: chloroprene rubber one hundred zinc oxide 4-6 rosin 40-60 colloidal silicic acid 80-60 molecular complex of resorcinol with urotropin, with stabilizer and plasticizer - РУ-D 40-60 nefras 277-285 ethyl acetate 345-365