RU2729237C1 - Coating production method - Google Patents

Abstract

FIELD: technological processes.SUBSTANCE: invention relates to methods of making a coating, in particular, two-layer, from rubber crumbs, which can be used for pavements, children's, sports and other sites, as well as in the form of facing material. Method of coating production includes preparation of mixture for lower layer of coating by mixing of filler from rubber crumbs and binder, unloading to the bottom section of heated mould of prepared mixture and laying of sheet material onto unloaded mixture, subsequent compaction of mixture and holding of filled mould during 5÷14 minutes at temperature 148÷152 °C of inner surface of bottom section of mould and temperature 138÷142 °C of lower surface of upper mould heater.EFFECT: technical result is improved reliability and durability of resilient coating.6 cl, 1 dwg

Description

Technology area

The invention relates to methods for manufacturing a coating, in particular a two-layer, of rubber crumb, which can be used for sidewalks, playgrounds, sports and other grounds, as well as in the form of facing material.

Prior art

From the prior art, a method for manufacturing a coating is known (see the closest analogue - Eurasian patent No. 023362, IPC В29С 43/08 (2006.01), В29С 43/20 (2006.01), C09D 175/04 (2006.01), C09D 117/00 (2006.01) , B05D 1/40 (2006.01), B05D 7/04 (2006.01), E01C 13/00 (2006.01) 10/27/2012), comprising preparing a mixture by mixing a rubber crumb filler and a binder; laying on the bottom section of the heated mold of the previously made sheet material, then unloading the prepared mixture onto the laid sheet material and then pressing them using a press. After pressing, the filled mold is kept at a temperature of 100 ÷ 60 ° C until the mixture is completely cured. Then the produced coating is removed from the mold and transferred to the warehouse.

The above method provides a continuous process for making the coating. However, holding the filled mold at the same temperature can lead to overheating or underheating of the coating layers. In the produced coating, when overheated, fragments can crumble, and when underheating, hidden cavities can form, which reduces the reliability and durability of the specified coating.

Disclosure of invention

The technical result is to increase the reliability and durability of the elastic coating.

The specified technical result is achieved in the method of manufacturing a coating, which consists in preparing a mixture for the lower layer of the coating by mixing a filler of rubber crumb and a binder, unloading the prepared mixture on the bottom section of the heated mold and placing it on the unloaded mixture of sheet material, subsequent compaction of the mixture and holding the filled mold for 5 ÷ 14 minutes at a temperature of 148 ÷ 152 ° С of the inner surface of the bottom section of the mold and a temperature of 138 ÷ 142 ° С of the lower surface of the upper mold heater.

In the manufacture of a coating with a thickness of 15 ÷ 49 mm, the filled mold can be kept for 5 ÷ 7 minutes.

In the manufacture of a coating with a thickness of 20 ÷ 24 mm, the filled mold can be held for 7 ÷ 9 minutes.

When making a coating with a thickness of 25 ÷ 28 mm, the filled mold can be kept for 9 ÷ 12 minutes.

In the manufacture of a coating with a thickness of 29 ÷ 31 mm, the filled mold can be kept for 12 ÷ 14 minutes.

To compact the mixture, the filled mold can rise up to a level until the upper heater, touching its lower surface with the sheet material and compacting the mixture, enters the mold at a height set by the operator.

The coating can be produced simultaneously on several molds stacked one above the other.

Sheet material can be made of a filler in the form of crumb rubber with a fraction of 1 ÷ 3 mm and a binder based on polyurethane with the addition of a pigment dye.

It should be understood that those skilled in the art will be able to suggest other embodiments of the invention and that some of its details may be changed in various other aspects without departing from the spirit and scope of the present invention. Accordingly, the explanatory figures and the detailed description of the method for making the coating are illustrative and not restrictive.

Brief Description of the Explanatory Figures

The figure schematically shows the produced coating.

Implementation of the invention

The proposed method of manufacturing the coating 1 is relatively simple and technological, allows, including from previously utilized rubber products, such as automobile tires, to produce an injury-safe coating of increased strength with damping properties.

The specified cover 1 contains the upper 2 and lower 3 layers. The top layer 2 is usually a decorative layer that can be of different colors.

The upper layer 2 of the coating 1 can be preliminarily made from a filler in the form of a crumb rubber fraction, mainly 1 ÷ 3 mm, with the addition of a binder based on polyurethane and a pigment dye.

The upper layer 2 can be made of a previously made thin seamless sheet material with a thickness of 2 ÷ 8 mm. The mentioned sheet material is made denser in relation to the lower layer 3, which increases the wear resistance and reliability of the coating 1.

The lower layer 3 of the cover 1 is the base layer and is made mainly of black crumb rubber. The lower layer 3 of the coating 1 is a hardened mixture of a binder based on polyurethane with a filler in the form of a crumb rubber fraction, mainly 2 ÷ 12 mm. The possibility of adding a pigment dye to the mixture for the specified bottom layer 3 is not excluded.

The method for manufacturing a two-layer coating is implemented as follows.

For the manufacture of the coating, the selection of colored sheet material with a thickness of mainly 2 ÷ 4 mm, as well as a binder based on polyurethane, is carried out. As a binder can be used glue brands NEOMER-MS or other brands with similar properties and characteristics as the above glue. The binder should have a liquid and viscous consistency, and in color it can be transparent or opaque, for example, milky or yellowish, or another color.

Rubber crumb of fraction 2 ÷ 12 mm is selected as a filler. For the preparation of the filler, a vibrating sieve can be used, by means of which the rubber crumb is sieved, because it is important that the filler is free of foreign inclusions such as, for example, textile and / or metal cord.

Blanks are cut from the sheet material, the shape and dimensions of which practically repeat the shape and dimensions of the bottom section of the mold, in which the coating 1 will be made.

The preparation of the mixture for the lower layer 3 of the coating 1 is carried out by mixing a filler made of rubber crumb with a fraction of 2 ÷ 12 mm and a binder based on polyurethane. This makes it possible to obtain a homogeneous mass, avoid the formation of lumps in the mixture and thereby increase its quality and, accordingly, the reliability of the coating during its operation.

Simultaneously with the process of preparing the mixture, the inner surface of the mold can be lubricated with a release agent, in particular, a polymethylsalaxane lubricant, preferably with a viscosity of 200 (PMS-200), which makes it possible to avoid adhesion of the prepared mixture and sheet material to the mold, which facilitates extraction from the specified mold of the produced coating 1.

The prepared mixture is unloaded onto the bottom section of the heated mold and leveled. Further, on the specified unloaded and leveled mixture, sheet material is laid, covering the specified mixture from above. After that, the filled mold is placed in the equipment area, where the mixture is pressed using a press. In the process of pressing, the mixture loaded into the mold is compacted.

After pressing, the filled mold is kept until the mixture is completely hardened for 5-14 minutes at a temperature of 148-152 ° C of the inner surface of the bottom section of the mold and a temperature of 138-142 ° C of the lower surface of the upper mold heater.

In a specific example of execution, the filled mold is lifted upward by means of a press until the upper heater, contacting its lower surface with the sheet material and compacting the mixture, enters the mold at a height set by the operator, which determines the thickness of the coating being produced 1. In this case the lower heater is constantly in contact with its upper surface with the bottom section of the mold and ensures its continuous heating.

In the process of manufacturing coating 1, the temperature of 138-142 ° C is constantly maintained on the lower surface of the upper mold heater, and the temperature of 148-120 ° C is constantly maintained on the upper surface of the lower heater. With the help of the lower heater, the temperature of 148 ÷ 152 ° C is maintained on the inner surface of the bottom section of the filled mold.

When making a coating with a thickness of 15–19 mm, the filled mold is kept for 5–7 minutes.

In the manufacture of a coating with a thickness of 20 ÷ 24 mm, the filled mold is kept for 7 ÷ 9 minutes.

When making a coating with a thickness of 25 ÷ 28 mm, the filled mold is kept for 9 ÷ 12 minutes.

In the manufacture of a coating with a thickness of 29 ÷ 31 mm, the filled mold is kept for 12 ÷ 14 minutes.

After the mixture has hardened, the maintenance personnel takes the mold out of the heating zone, removes the manufactured coating 1 from it and moves it to the warehouse.

It should be noted that throughout the entire manufacturing process of coating 1, a temperature of 148–152 ° C is maintained on the upper surface of the lower heater, and a temperature of 138–142 ° C is maintained on the lower surface of the upper heater.

It is advantageous to maintain a temperature of 140 ° C at the bottom surface of the upper heater and 150 ° C at the inner surface of the bottom portion of the mold.

The above-described method allows the coating 1 to be produced simultaneously on several molds stacked one above the other. In this case, each of the molds can be heated by two heaters: upper and lower, providing the above heating temperatures.

Also, the possibility of using three heaters for two located one under the other molds is not excluded, one of which is common and performs the function of the upper heater for the filled lower mold and the function of the lower heater for the filled upper mold. Moreover, the specified heater can provide the above-mentioned temperature range.

The coating 1 can also be made on the equipment described in detail in the Eurasian patent No. 023362, indicated as the closest analogue to the claimed method of manufacturing the coating 1.

The above method ensures a reliable connection of the mixture with the sheet material, minimizes the possibility of chipping of fragments from the upper layer 2 and the formation of hidden cavities in the lower layer 3, which can lead to early defects in the coating 1.

The produced two-layer coating is installed with the lower layer 3 on a base, for example, a concrete slab, or earth, or sandy soil, or another base, while the upper layer 2 of the coating 1 is facing outward and is representative. The specified two-layer coating has elasticity, which makes it possible to classify it as injury-safe and use it for the construction of sidewalks, children's, sports and other playgrounds, as well as in the form of facing material. The use of sheet material as the top layer 2 of the coating 1 increases the wear resistance and increases the service life of the said coating 1.

Claims (6)

1. A method of making a coating, including preparing a mixture for the lower coating layer by mixing a crumb rubber filler and a binder, unloading the prepared mixture on the bottom section of the heated mold and placing the sheet material on the unloaded mixture, then compacting the mixture and holding the filled mold in for 5 ÷ 14 minutes at a temperature of 148 ÷ 152 ° C of the inner surface of the bottom section of the mold and a temperature of 138 ÷ 142 ° C of the lower surface of the upper mold heater. 2. A method of making a coating according to claim 1, characterized in that when making a coating with a thickness of 15–19 mm, the filled mold is kept for 5–7 minutes. 3. A method for manufacturing a coating according to claim 1, characterized in that during the manufacture of a coating with a thickness of 20–24 mm, the filled mold is kept for 7–9 minutes. 4. A method of making a coating according to claim 1, characterized in that during the manufacture of a coating with a thickness of 25–28 mm, the filled mold is kept for 9–12 minutes. 5. The method of manufacturing a coating according to claim 1, characterized in that during the manufacture of a coating with a thickness of 29 ÷ 31 mm, the filled mold is kept for 12 ÷ 14 minutes. 6. A method for producing a coating according to claim 1, characterized in that, to compact the mixture, the filled mold rises up to a level until the upper heater, contacting its lower surface with the sheet material and compacting the mixture, enters the mold to a height, determined by the thickness of the coating.

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