RU2671319C1 - Protective mixture for industrial rubber goods of agricultural machinery - Google Patents

Abstract

FIELD: polymer industry.SUBSTANCE: invention relates to the polymer industry and can be used for protection against heat, light, ozone and atmospheric aging of rubber products and rubber regeneration during storage of agricultural equipment in open areas. Protective mixture contains components in the following ratio, wt. %: paraffin – 92; liquid rubber – 7; nanopowder – 1. Nanopowder consists of carbon nanoparticles – 4 wt. % and iron – 96 wt. % with a BET surface area of about 10 m/g and melting point of 1550 °C.EFFECT: increase in the penetrating ability of the mixture, adhesion to the surface of rubber products and a decrease in the rate of aging of rubber is provided.1 cl

Description

The invention relates to mixtures used for protection against heat, light, ozone and atmospheric aging of rubber products and rubber regeneration during storage of agricultural equipment in open areas.

A known composition for protective coatings of rubber products [1], consisting of gasoline and a rubber mixture containing, parts by weight:

Butyl rubber 50-80; Thermoelastoplast 20-50; Technical carbon 20-30; Stearic acid 1-3; Oil bitumen 2-5;

in the following ratio of components, wt. %:

Rubber compound 8-10; Petrol 90-92.

The disadvantage of the protective mixture is its low penetration into microcracks of the protected material.

Closest to the claimed is a mixture of paraffin with ruberax, rosin and its esters [2].

The disadvantages of the protective mixture are that it is used only for surface impregnation and does not allow the treatment of internal cavities and microcracks of the protected material.

The objective of the invention is the creation of a protective mixture for rubber products with high penetrating ability and the ability to handle microcracks of the protected material.

The technical result is to reduce the rate of atmospheric aging of rubber products of agricultural machinery in open areas during the off-season, due to the high penetration into microcracks of rubber and the formation of a protective film on its surface.

The technical result is achieved in that the protective mixture for the rubber parts of agricultural machinery when stored on open areas during the off-season period contains melted wax, liquid rubber and nanopowder, in the following ratio of components, wt. %: paraffin - 92; liquid rubber - 7; nano powder - 1.

A comparable analysis with the prototype shows that the inventive protective mixture for rubber products of agricultural machines meets the criterion of "novelty", as it differs from the prototype:

- In the protective mixture, liquid rubber is used as a regenerator.

- In the protective mixture, nanopowder is used as a filler.

Liquid rubber is a special material that is mastic. Two-component mastic allows instant hardening of liquid rubber.

Liquid rubber is the latest material used for waterproofing various surfaces. It also serves to level surfaces and fill voids in joints and joints, wet cracks.

Liquid rubber completely fills damage of any size (which is very convenient and reliable). Liquid rubber does not dissolve in water; water serves as a catalyst for the hardening of this material.

The main characteristic that makes liquid rubber stand out from the rest is its ability to adhere to any material. Such a material has a service life equal to the service life of the surface on which it is applied.

Nano iron-carbon powder.

This powder was produced at the Institute of Metallurgy and Materials Science named after A.A. Bakova.

The powder contains, by weight. %:

- iron nanoparticles having a core and an outer shell (2-10 nm) formed by the oxides of this metal - 96%;

- carbon - 4%.

Physical and chemical properties.

The powder is dark gray. Arithmetic average particle size of 80-100 nm. Individual powder particles form microagglomerates. Bulk density 1, 03 g / cm ³ . The specific surface measured by the BET method is about 10 m2 / g. Melting point 1550 ° C. It has no smell.

Nano-powder penetrates into microcracks of a rubber product and enters into adhesive bond with its internal surfaces, which leads to the restoration of the rubber product.

The mixture was prepared by mixing the calculated components in paraffin at room temperature by mechanical stirring in a paddle mixer to obtain a homogeneous mixture, the approximate duration is 5-10 minutes. The mixture based on paraffin and liquid rubber has a dark gray color and is easily applied by spraying under pressure on the surface of rubber products. The mixture has a high penetrating ability and adhesion to the surface of rubber products and is applied by a uniform, thin layer in a hot state.

In the manufacture of the mixture, the following sequence of loading the constituent components is recommended: melted wax, liquid rubber, nano powder.

After prolonged storage, it is advisable to mix the mixture for 1-2 minutes after heating.

Before production tests of the mixture, laboratory tests were carried out. Studies of the protective properties of the mixture were carried out in a Tabal climate chamber, where the samples were subjected to cyclic exposure to artificial factors that occurred during long-term storage of agricultural equipment in open areas during the off-season period.

The following mixtures were taken to select effective remedies:

1. Paraffin; 2. Liquid rubber; 3. Paraffin + liquid rubber; 4. Paraffin + ruberax + rosin and its esters; 5. Experimental mixture: paraffin + liquid rubber + nano-powder (iron-carbon), a thin layer was applied to the surface of the rubber samples.

From the results of accelerated tests, it can be seen that the comparative wear of rubber products in the climate chamber was 800 hours of testing with the experimental composition — 2.9%; and paraffin with ruberax, rosin and its esters - 8.3%. This suggests that the mixture applied to rubber products with liquid rubber and nano powder (iron-carbon) have a higher permeability and adhesion to the surface of rubber products. The technical capabilities of the protective mixture with liquid rubber and nano powder (iron-carbon) are significantly increased in terms of durability. The rinsing time for accelerated tests in the climate chamber was 800 hours for liquid rubber and nano-powder (iron-carbon), and for a mixture with rubex, rosin and its esters - 740 hours.

When conducting production tests of lubricants at the machine yard of Pronskoye LLC in the Pronsky district of the Ryazan region in the period 2015-2016 rubber products of agricultural machinery were coated with experimental mixtures and at the same time, control samples of rubber 100 × 150 mm in size were installed on the sites, the same mixture was applied to the surface of the samples.

The results of industrial tests of the protective properties of the mixture for the protection of rubber products controlled in storage conditions in open areas confirm that the maximum wear of rubber products treated with a mixture of liquid rubber and nano powder is significantly lower, equal to 2.5%, versus 5.8% with ruberax, rosin and its esters.

The results of accelerated and production tests of the protective properties of the mixture give reason to believe that the addition of liquid rubber and nanopowder gives a technical result. The composition of the mixture of this composition, having a coefficient of protective ability K - 0.94-0.97, can be recommended and used to protect rubber products of agricultural machinery from aging when stored in open areas during the off-season period.

The use of a protective mixture will eliminate atmospheric aging of rubber products of agricultural machinery when stored in open areas, due to high penetrating ability, adhesion to the surface of rubber products and reduce the speed of all types of rubber aging.

Bibliography

1. Patent No. 2061720 of the Russian Federation. IPC C09D 119/00, C09D 7/12, C09D 119/00, C09D 195/00. Composition for protective coatings / Zavgorodnev V.A. and others. Patent holder Research Institute of the tire industry. - No. 5037349; declared 03/19/1992; publ. 06/10/1996.

2. Patent No. 99855 SU. IPC C08J 7/04. A method of protecting rubber products from cracking / Divova MP, Marey A.I .; Patentee Divova M.P., Marey A.I. - No. 449176; declared 05/20/1953; publ. 01/31/1955.

Claims (3)

The protective mixture for the rubber parts of agricultural machinery when stored on open areas during the off-season period contains melted paraffin, characterized in that it additionally contains liquid rubber and nanopowder, consisting of carbon nanoparticles - 4 wt. % and iron - 96 wt. % with a specific BET surface of about 10 m ² / g and a melting point of 1550 ° C, with the following ratio of components, wt. %: Paraffin 92 Liquid rubber 7 Nanopowder one