KR20070107925A - Rubber structure using rubber scrap comprised cord yarn and method for manufacturing the same - Google Patents

Abstract

A rubber structure using rubber scrap particles containing cord yarns is provided to realize excellent mechanical strength including tensile strength and wear resistance and durability including weather resistance. A rubber structure is obtained by the method comprising a step(S10) of crushing non-vulcanized lumps of rubber scraps containing cord yarns generated from the manufacture of a tire or industrial belt into rubber scrap particles having a size of 5mm-50mm, a step(S20) of mixing the rubber scrap particles, a step(S30) of molding the rubber scrap particles into a planar sheet, and a step(S50) of pressurizing and heating the sheet. In the rubber structure, the cord yarns are present in an amount of 40-60 wt.% based on the total weight.

Description

Rubber structure using rubber scrap including cord yarn and method for manufacturing the same}

1 is a perspective view of a speed bump which is a rubber structure using a rubber scrap including a cord yarn according to an embodiment of the present invention.

Figure 2 shows a rubber structure manufacturing process using a rubber scrap comprising a cord yarn according to an embodiment of the present invention.

According to the present invention, an unvulcanized rubber scrap lump including a cord yarn generated in the production process of a tire or an industrial belt is crushed into rubber scrap particles of a predetermined size, and then manufactured into a sheet-like sheet and molded and vulcanized using the same to obtain tensile strength. The present invention relates to a rubber structure using a rubber scrap including a cord yarn capable of manufacturing a rubber structure having excellent durability including mechanical strength and weather resistance including wear resistance, and a manufacturing method thereof.

In general, a certain parking area is set in a parking lot such as an apartment complex or a large department store, and a parking block is installed in a certain area of an individual parking area. The parking block has a function of guiding the parking position of the vehicle and at the same time preventing a vehicle accident in the parking process.

On the other hand, a speed bump is installed on the road to prevent the speed of the vehicle, such as a residential road, to prevent the speed of the vehicle.

Rubber block products that do not require high functionality, such as conventional parking blocks or speed bumps, are generally manufactured using recycled rubber. The reclaimed rubber refers to a rubber in which rubber products used for a certain period, such as waste tires, are cut or pulverized, softened by adding additives, regenerated, and further mixed with unvulcanized rubber. However, such a regeneration process is carried out by adding an organic chemical and an oil containing an additive and heating for a few hours under a constant pressure and temperature, a lot of energy is consumed, the regeneration cost is excessive. In addition, such regenerated rubber has a low mechanical property including tensile strength and wear resistance, and has a problem in that the durability including weather resistance is poor and prematurely broken or worn during use.

Rubber structure using a rubber scrap comprising the cord yarn of the present invention for solving the above problems is a rubber of a predetermined size of the rubber scrap mass of the unvulcanized state including the cord yarn generated in the production process of the tire or industrial belt After crushing the scrap particles into a sheet-like sheet and molded and vulcanized using the rubber scrap containing a cord yarn that can produce a durable rubber structure including mechanical strength and weather resistance including tensile strength and wear resistance An object of the present invention is to provide a rubber structure and a manufacturing method thereof.

In order to solve the above problems, the rubber structure using the rubber scrap including the cord yarn of the present invention has a mass of unscratched rubber scrap including cord yarn generated in the production process of a tire or an industrial belt of 5 mm or more. It is pulverized and mixed into rubber scrap particles of 50mm, and formed by the pressurized heating after being molded into a sheet-like sheet, characterized in that the cord yarn is included in 40% to 60% by weight ratio. At this time. The rubber structure may be a speed bump or a parking block. The speed bumps or parking blocks may have a pattern of a predetermined shape including a comb pattern on an upper surface thereof.

In addition, the rubber structure manufacturing method using a rubber scrap comprising a cord yarn according to the present invention, the rubber scrap mass of the unvulcanized state including the cord yarn generated in the production process of the tire or industrial belt 5 mm to 50 mm rubber scrap Rubber scrap grinding step of grinding into particles, rubber scrap particle mixing step of mixing and maintaining the rubber scrap particles at a temperature of 40 to 80 ℃ and plate-like sheet forming step of forming the rubber scrap particles into a sheet sheet and the sheet sheet Filling the mold corresponding to the shape of the rubber structure and characterized in that it comprises a rubber structure forming and vulcanizing step of vulcanization while molding for 10 to 30 minutes at a temperature of 120 ℃ to 200 ℃.

The present invention further includes a plate sheet cutting step of cutting the plate sheet into a cutting sheet having a shape corresponding to the planar shape of a rubber structure after the plate sheet forming step, wherein the rubber structure forming and vulcanizing step includes the cutting sheet. It can be done using.

In addition, the mold used in the molding and vulcanizing step of the rubber structure in the present invention may be formed, including a cord yarn, characterized in that the pattern is formed on the inner surface to form a pattern corresponding to the surface of the rubber structure. have. In addition, the rubber structure may be a speed bump or a parking block.

Hereinafter, a rubber structure using a rubber scrap including a cord yarn of the present invention and a method of manufacturing the same will be described in more detail with reference to Examples.

1 is a perspective view of a speed bump which is one of rubber structures using rubber scraps including cord yarn according to an exemplary embodiment of the present invention.

The speed bump 10, which is one of the rubber structures according to the exemplary embodiment of the present invention, is formed in the shape of a plate while being protruded relative to the surrounding portion while being formed in a substantially plate shape. The speed bump 10 is formed in a shape close to a triangle when viewed in a cross section perpendicular to the longitudinal direction. In addition, the speed bump 10 is formed on the upper surface, such as a comb pattern 12 is formed to form a uniform appearance as a whole even if the code paper contained therein is exposed to the surface. In addition, the comb pattern 12 of the speed bumps 10 improves the friction characteristics of the upper surface, and prevents the friction characteristics from deteriorating by allowing the water present on the upper surface to flow to the road. The pattern formed on the upper surface of the speed bump 10 is not limited to the comb pattern 12 and may include various patterns including various patterns formed on the surface of the tire. The speed bump 10 is manufactured by using a rubber scrap including a cord yarn generated in the process of manufacturing a car tire or an industrial belt as a raw material.

Since the automobile tire must be responsible for a shock absorbing effect to withstand air pressure and maintain a shock, the side wall portion is formed by including the cord yarn to increase durability and tensile strength. The cord yarn is formed by coating rubber on fibers such as nylon, rayon, polyester, and the like, and the rubber including the cord yarn is laminated to form a sidewall.

More specifically, automobile tires are manufactured by the following process. First, a rubber sheet used for each part such as a tread part, a side wall part, and a belt constituting a tire is separately manufactured and cut to a specification, and then molded together to produce a tire shape. The molded car tire is completed through the vulcanization process. At this time, the rubber sheet forming the side wall portion is formed by laminating together the cord and cord yarn such as nylon, rayon, polyester coated with rubber on the surface. The rubber sheet is usually included in the weight ratio 40% to 60% of the entire rubber sheet. In the process of cutting the rubber sheet into a shape corresponding to the shape of the side wall, a rubber scrap including a cord yarn is generated. Therefore, the speed bump 10 is manufactured by using rubber scrap generated in the tire manufacturing process as a raw material. Previously, all of this rubber scrap was discarded.

In addition, an industrial belt such as a conveyor belt or a V-belt is formed by placing a cord in the longitudinal direction of the belt inside the elastic rubber and covering the cover rubber thereon. The industrial belt is formed by cutting to a predetermined standard after inserting the cord yarn in the elastic rubber. Therefore, even in the process of manufacturing the industrial belt is generated rubber scrap contained inside the cord yarn. The industrial belt is formed by including 40% to 60% of the cord yarn relative to the total weight of the elastic rubber and cord yarn.

Since the rubber scrap containing the cord yarn is generated before the vulcanization process is performed in the manufacturing process of the tire or the industrial belt, the rubber scrap is in an unvulcanized state.

The speed bump 10 is manufactured through a vulcanization process after molding the rubber scrap in an unvulcanized state as a raw material. In addition, the speed bump 10 is formed by including the cord yarn 40% to 60% by weight of the total. Accordingly, the speed bump 10 has a simpler manufacturing process and better durability, including weather resistance, compared to the case of using recycled rubber. In addition, since the speed bumps 10 include cord yarns therein, mechanical properties such as tensile strength and wear resistance are excellent.

On the other hand, the rubber structure according to the embodiment of the present invention may include a structure such as a parking block in addition to the speed bumps. Although not shown in the figure, the parking block is formed in a substantially rectangular block shape, and mechanical properties such as tensile strength, wear resistance, and impact resistance become important. Since the parking block uses rubber scrap in an unvulcanized state generated in the process of producing a tire, the parking block has mechanical properties similar to that of the tire.

Next, a method of manufacturing a rubber structure using a rubber scrap including a cord yarn according to an embodiment of the present invention will be described.

 Figure 2 shows a process diagram of a rubber structure manufacturing method using a rubber scrap comprising a cord yarn according to an embodiment of the present invention.

Rubber manufacturing method using a rubber scrap comprising a cord yarn according to an embodiment of the present invention, referring to Figure 2, the rubber scrap grinding step (S10) and rubber scrap particle mixing step (S20) and the sheet-like sheet forming step It is formed, including (S30) and the rubber structure molding and vulcanization step (S40). In addition, the manufacturing method of the rubber structure using the rubber scrap containing the cord yarn may be formed by further comprising a plate-like sheet cutting step (S35). The rubber scrap including the cord yarn is a natural rubber or synthetic rubber material that is a main component of a tire or an industrial belt, and styrene-butadiene rubber (SBR) material may be used as the synthetic rubber. In addition, the cord yarn is made of fibers such as nylon, rayon, polyester.

The rubber scrap grinding step (S10) is a step of grinding the rubber scrap lump to a predetermined size. The rubber scrap is generated in pieces during the cutting process of the tire or industrial belt manufacturing process, and agglomerated together in the collecting process. The rubber scrap mass is not easily separated because the cord yarn is included therein. Therefore, the rubber scrap mass cannot be used to make a sheet sheet as it is and must be ground to an appropriate size. The rubber scrap mass is crushed into particles having a size of 5 to 50 mm, and preferably to particles having a size of 5 to 10 mm. When the size of the rubber scrap particles is smaller than 5mm, it takes a long time to grind and there is a problem in that the rubber scrap is partially generated by heat generated in the grinding process. In addition, when the size of the rubber scrap particles is larger than 50mm, the cord yarn contained in the rubber scraps in the rubber scrap particle mixing step and the plate sheet forming step are intertwined with each other, thereby preventing the flow of the rubber scrap particles, thereby making it difficult to form. Will be. On the other hand, when the size of the rubber scrap particles is in the range of 5 mm to 10 mm, the flow of rubber scrap particles is smooth, so that the rubber scrap particle mixing step and the plate-like sheet forming step may be smoothly performed. As a grinder for grinding the rubber scrap mass, a grinder such as a hammer type, a cutting type or a mill type may be used, and a grinder such as a cutter mill or a ball mill may be used.

The rubber scrap particle mixing step (S20) is a step of mixing the rubber scrap particles. The rubber scrap may have a difference in components according to production rods or products used, and there may be a difference in components between rubber scrap particles formed by grinding a plurality of rubber scraps. Therefore, when the rubber scrap particles are used without mixing, there may be a problem in that rubber properties are not uniform in the rubber structure as a whole. The rubber scrap particle mixing step (S20) is mixed for about 3 to 10 minutes. If the mixing time is small, the mixture is not sufficiently mixed, if the mixing time is long, heat is generated, there is a problem that the scorch is partially generated. The rubber scrap particle mixing step (S20) to uniformly mix the rubber scrap particles crushed in each rubber scrap to have a uniform property as a whole. The mixing of the rubber scrap particles is carried out using a general mixer for mixing the rubber particles. Meanwhile, since the rubber scrap particles are rubber particles in an unvulcanized state, scorch may be generated by heat generated during mixing. When the scorch is generated in the mixing process of the rubber scrap particles, the flowability of the rubber is deteriorated, thereby causing a defect in the appearance of the final product, and at the same time, a problem of deterioration of physical properties. Therefore, the rubber scrap particle mixing step (S20) is preferably performed while cooling the rubber scrap particles to a predetermined temperature below the vulcanization temperature of the rubber scrap. The rubber scrap particles are maintained at a temperature of 40 to 80 ° C., which is the vulcanization temperature of the rubber scrap, preferably at a temperature of 40 to 60 ° C. When the temperature of the rubber scrap particles is lower than 40 ° C., the cooling effect is small and the cost is relatively increased. When the temperature of the rubber scrap particles is higher than 80 ° C as a whole lower than the vulcanization temperature, but partially rises to the vulcanization temperature may be locally vulcanized. The temperature of the rubber scrap particles may be properly maintained according to the mixing speed and time.

On the other hand, the rubber scrap particle mixing step (S20) may be carried out by adding additional additives in order to improve the properties of the rubber structure or when necessary in the manufacturing process of the rubber structure.

The sheet sheet forming step (S30) is a step of stretching and cooling the rubber scrap particles into a plate shape to form a sheet sheet of a predetermined size. The sheet-like sheet forming step (S30) proceeds according to the method used in the sheet forming process using a roller generally used for the material of the rubber scrap particles. Therefore, the rubber scrap particles are formed into a sheet sheet having a predetermined size through a molding process.

The plate sheet cutting step (S35) is a step of cutting the plate sheet to a proper shape in consideration of the shape of the rubber structure. The plate-like sheet is preferably formed by seating the cutting sheet cut into a shape corresponding to the planar shape of the rubber structure.

The rubber structure forming and vulcanizing step (S40) is a step of filling and vulcanizing the cut sheet-like sheet into a mold corresponding to the shape of the rubber structure. The rubber structure molding and vulcanization step (S40) is carried out at an appropriate temperature according to the rubber material and additives of the sheet-like sheet, it is carried out for 10 to 30 minutes at a vulcanization temperature of 120 to 200 ℃. When the vulcanization temperature is lower than 120 ° C., there is a problem that vulcanization does not proceed sufficiently, thereby deteriorating the physical properties of the rubber structure. In addition, when the vulcanization temperature is higher than 200 ° C., too much vulcanization occurs, or a reversion phenomenon occurs in which the rubber is softened again, thereby deteriorating physical properties of the rubber structure. In addition, when the time that the vulcanization proceeds is less than 10 minutes, the vulcanization does not proceed sufficiently, thereby deteriorating the physical properties of the rubber structure. In addition, if the time that the vulcanization proceeds longer than 30 minutes, too much vulcanization or a reversion phenomenon occurs in which the rubber is softened again, thereby deteriorating the physical properties of the rubber structure. Molding and vulcanizing the rubber structure (S40) may be performed under the same conditions as the manufacturing conditions of the tire or industrial belt.

On the other hand, the mold for molding the rubber structure may be formed on the surface of the rubber structure by forming a predetermined pattern on the inner surface. In this case, even if the cord yarn contained in the rubber structure is exposed to the surface of the rubber structure is not easy to identify, it is possible to make the overall appearance of the rubber structure uniform. The pattern formed in the mold may be intaglio or embossed, or may be formed in a pattern due to corrosion. On the other hand, the pattern of the rubber structure may be formed to perform a specific function with respect to the use of the rubber structure. For example, when the rubber structure is a speed bump, a pattern such as a comb pattern may be formed on the upper surface to have a drainage function and a function of increasing frictional force to prevent water from accumulating on the upper surface.

The rubber structure according to the manufacturing method of the rubber structure using the rubber scrap containing the cord yarn is increased in the mechanical strength and abrasion resistance including the tensile strength because the cord yarn is uniformly distributed therein as a filler inside. In addition, the rubber structure is molded and vulcanized from an unvulcanized rubber scrap and thus has characteristics of a tire or an industrial belt. Therefore, the rubber structure has much better durability characteristics such as weather resistance than when using recycled rubber. The rubber structure may be formed of a structure such as a speed bump or a parking block requiring weather resistance, abrasion resistance, and mechanical strength.

The following describes specific embodiments of the present invention, but the present invention is not limited thereto.

Example 1

The lumps of unvulcanized rubber scrap containing cord paper generated during tire production were ground into rubber scrap particles having an average size of 6 mm. The non-vulcanized rubber scrap lump is mainly composed of styrene-butadiene rubber, and includes about 45% of polyester cord yarn laminated therein. Next, the rubber scrap particles were mixed for about 10 minutes while maintaining the temperature in a range of 50 degrees at room temperature. It was confirmed that the mixed rubber scrap particles did not generate scorch. The mixed rubber scrap particles were molded into plate-like sheets, and the plate-like sheets were cut into cutting sheets corresponding to shapes to be molded. The cutting sheet was filled into a mold and formed as a speed bump through molding and vulcanization at a temperature of 140 ° C. to 150 ° C. for 20 minutes. The mold has a comb pattern formed on the inner surface, and the speed bumps are formed to have a uniform appearance regardless of the cord yarn partially exposed on the surface.

The speed bumps formed as described above showed mechanical properties including tensile strength and wear resistance and durability including weather resistance similar to those of tires. At this time, the tire is a tire providing the rubber scrap of the first embodiment.

Example 2

The rubber scrap mass was crushed into rubber scrap particles of approximately 9 mm size on average. The unvulcanized rubber scrap lump is a rubber mixed with natural rubber and styrene butadiene rubber, and the polyester cord yarn is laminated with about 55% of the inside. Next, the rubber scrap particles were mixed for about 5 minutes while maintaining the temperature in the range of 60 to 80 degrees. The speed bumps were formed by filling a sheet-like sheet formed of the rubber scrap particles into a mold and molding and vulcanizing at a temperature of 140 ° C. to 150 ° C.

The speed bumps showed mechanical properties including tensile strength and wear resistance and durability including weather resistance similar to those of tires.

As described above, the present invention is not limited to the specific preferred embodiments described above, and any person having ordinary skill in the art to which the present invention pertains without departing from the gist of the present invention claimed in the claims. Various modifications are possible, of course, and such changes are within the scope of the claims.

According to the rubber structure using the rubber scrap including the cord yarn of the present invention and a manufacturing method thereof, there is an effect of recycling the waste resources by using the rubber scrap generated in the manufacturing process of the tire or industrial belt.

In addition, according to the present invention, since the rubber scrap in the unvulcanized state is pulverized and mixed into particles, the rubber component has a uniform distribution of all components and cord yarn of the rubber, and the overall characteristics are uniform.

In addition, according to the present invention, the rubber structure is formed using rubber scrap in the unvulcanized state, and has the same properties as those of a tire or an industrial belt in mechanical strength, abrasion resistance, and weather resistance, and has superior physical properties when using recycled rubber. It has an effect.

Claims (7)

The unvulcanized rubber scrap lump including cord yarn generated in the production process of a tire or an industrial belt is crushed and mixed into rubber scrap particles of 5 mm to 50 mm, formed into a sheet sheet, and formed by pressurized heating. Rubber structure using a rubber scrap comprising the cord yarn, characterized in that the cord yarn is formed to include 40% to 60% by weight. The rubber structure according to claim 1, wherein the rubber structure is a speed bump or a parking block. The rubber structure of claim 2, wherein the speed bumps or the parking block have a cord having a predetermined shape including a comb pattern on an upper surface thereof. A rubber scrap crushing step of crushing an unvulcanized rubber scrap lump including a cord yarn generated in a tire or industrial belt production process into rubber scrap particles having a size of 5 mm to 50 mm; Mixing the rubber scrap particles while maintaining the rubber scrap particles at a temperature of 40 to 80 ° C .; A plate sheet forming step of forming the rubber scrap particles into a plate sheet; It comprises a cord yarn comprising a rubber structure molding and vulcanizing step of filling the sheet-like sheet into a mold corresponding to the shape of the rubber structure and vulcanized while molding for 10 to 30 minutes at a temperature of 120 ℃ to 200 ℃ Rubber structure manufacturing method using rubber scrap. The method of claim 4, wherein After the sheet sheet forming step further comprises a plate sheet cutting step of cutting the plate-like sheet into a cutting sheet of a shape corresponding to the planar shape of the rubber structure, The rubber structure molding and vulcanization step is a rubber structure manufacturing method using a rubber scrap comprising a cord yarn, characterized in that made using the cutting sheet. The method of claim 4, wherein The mold used in the rubber structure molding and vulcanization step is a rubber structure manufacturing method using a rubber scrap comprising a cord yarn, characterized in that a pattern of a predetermined shape is formed on the inner surface to form a pattern corresponding to the surface of the rubber structure. . The method of claim 4, wherein The rubber structure is a rubber structure manufacturing method using a rubber scrap comprising a cord yarn, characterized in that the speed bump or parking block.

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