KR100274411B1 - Flexible rubber sheet and the method of producing the same - Google Patents

Abstract

PURPOSE: A flexible rubber sheet and a producing method thereof are provided to have excellent repulsive property while reducing noise, and to improve durability. CONSTITUTION: To produce a flexible rubber sheet, 70-90wt% of rubber particles and 10-30wt% of a binder are mixed. Herein, size of the rubber particles is 1-5mm while having flat cut section. Moreover, the binder is formed by a liquid rubber adhesive including polyurethane resin or chloroprene resin. Then, a mixture formed by the rubber particles and the binder is uniformly mixed by a mixer. Then, the mixture is pressed at high temperature or compressed at low temperature for being formed into sheets. The pressing temperature or the compressing pressure is controlled not to melt a surface of a flexible rubber sheet.

Description

[Name of invention]

Elastic flooring and its manufacturing method {FLEXIBLE RUBBER SHEET AND THE METHOD OF PRODUCING THE SAME}

Detailed description of the invention

[Purpose of invention]

[Technical field to which the invention belongs and the prior art in that field]

The present invention relates to a method for producing an elastic flooring material, and more particularly, to a method for manufacturing an elastic flooring material produced by atomizing an elastic material such as vulcanized rubber and then hot pressing.

In general, it is an elastic flooring material installed on the floor of basketball courts, offices, schools, hospitals, hotels, golf courses, jogging courses, etc. Conventionally, after the waste rubber such as tires are atomized, a synthetic resin binder is mixed and thermally compressed to produce a plate shape. Was used.

As a related art, US Patent Publication No. 4042888, Japanese Patent Application No. 47-19358, and Japanese Patent Application No. 61-176760 disclose that fibrous or needle-like vulcanized rubber such as waste tires are mixed with single or unvulcanized rubber. Rubber chips are prepared by pulverizing and mixing them with binders such as urethane resins, and then molding them by pressing or flatly attaching them with a thickness of 4 to 20 mm on a nonwoven fabric or asphalt impregnated paper. Introducing.

However, the rubber powder or rubber particles used in the above technique use needle-like rubber particles obtained by grinding raw rubber into an abrasive grinder such as a cracker roll, so that the adhesive surface area between the particles increases, so that the amount of resin binder used as an adhesive is relatively high. In addition, the void density formed in the sheet is reduced, and thus the elasticity is inevitably lowered. Thus, there is a problem in that it is difficult to obtain the elasticity required by the exercise floorboard.

In consideration of this problem, when the amount of binder added is reduced, the non-bonded parts between rubber particles are formed, and the strength characteristics such as surface strength are greatly reduced. Therefore, the particle size distribution state is poor due to the characteristics of the needle rubber chips. There are problems such as easily falling off due to external friction or cracking of sheets easily.Therefore, there is a problem that is difficult to apply as a flooring material for use in a jogging course or a corridor such as an office, a school, or a hospital where frequent passengers come and go. There is a problem that can be limited to use as a soundproofing material or interlayer soundproofing of the apartment house.

In consideration of this problem, the present inventors mix rubber particles and liquid rubber paste obtained by pulverizing the rubber vulcanized from Korean Patent No. 6,763 (Patent Publication No. 92-7030), and then elastically heat-pressurize the plate to dry it. In the manufacturing method of the rubber sheet, the rubber particles used in the manufacture of the elastic rubber sheet characterized in that the cut rubber is a 2 to 24 mesh size obtained by cutting the waste rubber material with a sharp blade, the cut surface is a flat polyhedron with a sharp edge. I have provided a method.

[Technical problem to be achieved]

The present invention is to improve the prior invention of the present invention, as described in the prior art, using a rubber particle made of a polyhedron having a flat surface and a sharp edge as in the prior art, but the particle size of the rubber particles and the amount of the binder added together To provide an elastic flooring material with excellent rebound elasticity, low noise, and remarkably improved durability and strength characteristics by selectively adjusting the appropriate range of the porosity ratio of 10 to 30% in the sheet. There is this.

[Configuration of Invention]

In order to achieve the above object, the present invention provides a method for producing an elastic flooring material, wherein the particle size is 1 to 5 mm, and the cut surface is flat and the edge is 70 to 90% by weight of the rubber particles of polyhedron. After uniformly mixing 10 to 30% by weight of the liquid rubber paste containing chloroprene resin alone or a mixture, and then hot-vulcanized press or low-temperature compression to prepare a plate-like method for producing an elastic flooring material and the elastic flooring material prepared therefrom to provide.

As mentioned in the prior art, the rubber particles used in the present invention are cut by scissors with a sharp blade of raw rubber such as waste tires, and the surface of the crushed particles is polyhedron and the cut angle is sharply formed. Since the binder is easily penetrated, a suitable amount of adhesive effect can be obtained even with a small amount of binder. As a result, the void ratio between particles can be improved. It is possible.

Particularly, in the case of the elastic flooring material manufactured using rubber particles formed in a conventional fibrous or needle shape, it is difficult to uniformize the particle size distribution of the finally produced flooring material due to the difficulty of particle size selection in the form of particles. There was a problem that the detachment from the flooring surface, but when using the rubber particles of the present invention is possible uniformity of the particle size does not cause the above problems.

The particle size range of the rubber particles and the amount of added binder used as the adhesive also have a great influence on the adhesive strength and porosity ratio, that is, the elasticity, between the rubber particles of the manufactured elastic flooring material. As a result of repeated studies, it was found that the particle diameter of the polyhedral rubber particles is selected to be in the range of 1 to 5 mm, and when the particle diameter of the rubber particles is 1 mm or less, the void ratio in the flooring material is excessive. As the elasticity decreases and the adhesion specific surface area is increased, the amount of use of the binder is greatly increased. On the contrary, when the particle diameter is 5 mm or more, the adhesion force is reduced by reducing the adhesion specific surface area. Cracks in the liver may occur.

Binder added with the rubber particles having the particle size as described above can be used in the form of a single or mixed liquid rubber paste, such as polyurethane resin or chloroprene resin, respectively, as described above, and in some cases the liquid rubber paste and It is possible to use a mixture of dough together more than 10% by weight, based on the 70 to 90% by weight of the rubber particles can not be obtained the desired adhesive strength, when added more than 30% of the excess Binder components of the rubber particles Filling between the voids causes a problem of lowering the elastic modulus of the flooring.

The rubber particles having the particle size and the amount of addition as described above are mixed evenly with a blender, and then compressed to form a plate-like flooring material having a predetermined thickness. In this case, the pressing method is performed by hot pressing or low temperature pressing to form a plate. In this case, the compression temperature and pressure may be variously changed according to the compression method, but it is preferable to prevent the surface of the flooring material from melting due to overheating and overpressure during compression.

The elastic flooring material of the present invention prepared by the method described above is formed with a porosity of 10 to 30% to exhibit excellent elasticity and elongation characteristics, as well as a remarkable improvement in strength characteristics such as hardness, tensile strength or compressive strength. It can show the result.

Hereinafter, the present invention will be described in more detail with reference to the following examples, but the present invention is not limited to the following examples.

Example 1

The black rubber component obtained from the waste tires was crushed into a particle size range of 1 to 5 mm using a blade grinder, and 700 g of polyhedral rubber particles and 300 g of liquid polyurethane resin were mixed in a mixer, and then filled in a plate-shaped mold. It was pressed at 30 ° C. for 24 hours while applying a pressure of 100 g / cm 2.

The hardness, tensile strength, elongation rate, compressive strength and elasticity of the elastic flooring material thus prepared were shown in Table 1 below.

[Example 2]

The black rubber component obtained from the waste tires was crushed into a particle size range of 1 to 5 mm using a blade grinder, and then 800 g of polyhedral rubber particles and 200 g of liquid polyurethane resin were mixed in a blender and filled into a plate-shaped mold. Compression was carried out at 30 ° C. for 24 hours while applying a pressure of 100 g / cm 2.

The hardness, tensile strength, elongation rate, compressive strength and elasticity of the elastic flooring material thus prepared were shown in Table 1 below.

Example 3

The black rubber component obtained from the waste tire was crushed into a particle size range of 1 to 5 mm by using a blade grinder, and 900 g of polyhedral rubber particles and 100 g of liquid polyurethane resin were mixed in a blender, and then filled into a plate-shaped mold. It was pressed at 30 ° C. for 24 hours while applying a pressure of 100 g / cm 2.

The hardness, tensile strength, elongation rate, compressive strength and elasticity of the elastic flooring material thus prepared were shown in Table 1 below.

Comparative Example 1

The black rubber component obtained from the waste tires was crushed into a particle size range of 0.3 to 0.5 mm using a blade mill, and then 1000 g of polyhedral rubber particles and 50 g of liquid polyurethane resin were mixed in a mixer, and then filled into a plate-shaped mold. It was pressed at 30 ° C. for 24 hours while applying a pressure of 100 g / cm 2.

The hardness, tensile strength, elongation rate, compressive strength and elasticity of the elastic flooring thus prepared were measured and shown in Table 1 below.

Comparative Example 2

The black rubber component obtained from the waste tires was crushed into a particle size range of 8 to 10 mm using a blade mill, and then 1000 g of polyhedral rubber particles and 50 g of liquid polyurethane resin were mixed in a mixer, and then filled into a plate-shaped mold. It was pressed at 30 ° C. for 24 hours while applying a pressure of 100 g / cm 2.

The hardness, tensile strength, elongation rate, compressive strength and elasticity of the elastic flooring thus prepared were measured and shown in Table 1 below.

Comparative Example 3

After mixing the black rubber component obtained from the waste tire with cracker roller, 700g of needle-shaped rubber particles and 300g of liquid polyurethane resin, which were crushed into a particle size range of 1 to 3 mm in thickness and 5 to 30 mm in length, were mixed uniformly. It was bonded to the asphalt-impregnated paper to prepare a plate-like flooring.

The hardness, tensile strength, elongation rate, compressive strength and elasticity of the elastic flooring thus prepared were measured and shown in Table 1 below.

[Comparative Example 4]

The black rubber component obtained from the waste tire was mixed with 800 g of needle-shaped rubber particles and 300 g of liquid chloroprene rubber, which were crushed into a particle size range of 1 to 3 mm in thickness and 5 to 30 mm in length using a cracker roller, and then mixed uniformly. A plate-like flooring material was prepared by adhering to the by-pack cloth.

The hardness, tensile strength, elongation rate, compressive strength and elasticity of the elastic flooring thus prepared were measured and shown in Table 1 below.

As can be seen from Table 1, in the case of the elastic flooring material prepared from Examples 1 to 3 of the present invention, all the test items showed excellent results, whereas the particle size range of the rubber particles was 0.3 to 0.5 mm. In Comparative Example 1, in which the excessive amount of the material is added, it is excellent in the strength characteristic test items such as hardness, tensile strength, and compressive strength, but it is very poor in elongation and elasticity. Could.

On the contrary, in Comparative Example 2, in which the particle size range of the rubber particles was added to have a size larger than the particle size range of the present invention and the addition of a relatively small amount of the binder material, Comparative Example 2 appeared very excellent in the elasticity and elongation characteristics test, It turned out that it does not show a preferable effect.

On the other hand, in the case of the rubber sheet of Comparative Examples 3 to 4 prepared by adhering to the non-woven fabric or asphalt impregnated paper using the rubber particles of the shape of the rubber particles used in the manufacture of the flooring material, the hardness is measured Not only was this impossible, but also showed very poor results in strength characteristics, growth rate, and elasticity test, indicating that it could not be used as a flooring material.

[Effects of the Invention]

As described above, the present invention optimizes the porosity ratio formed in the sheet by selectively adjusting the particle size of the rubber particles used in the manufacture of the elastic flooring material and the amount of the binder added with the appropriate range. In addition, it is a useful invention to provide an elastic flooring material and a method for producing the same, which have significantly improved durability and strength characteristics.

Claims (1)

By vibrating rubber particles made of polyhedral rubber particles with a particle size of 1 to 5 mm and having a flat cut surface and sharp edges, a mixture of a liquid rubber paste including a sole or a mixture of polyurethane resin or chloroprene resin is mixed to form a hot press or low temperature press. A method for producing an elastic flooring material, characterized in that the mixing ratio of the rubber particles and the liquid rubber paste is 70 to 90% by weight: 10 to 30% by weight.