KR100723352B1 - Ethylene-propylene diene monomer(epdm) products by the utilization of reclaimed epdm powder - Google Patents

Abstract

The present invention relates to a method and composition of ethylene-propylene rubber (EPDM; Ethylene-Propylene Diene Monomer) waste to be pulverized by hot shear pulverization to recycle finely chemically activated fine powder as raw material rubber, and to EPDM rubber. EPDM which has the same physical properties as moldings made of relatively expensive EPDM rubber by using the appropriate amount of fine powder prepared by EPDM waste by high-temperature shearing grinding method with other additives. It is easy to obtain rubber products, so it can be very useful in various fields, and by expanding the scope of use of EPDM rubber, which had to be recycled only for some limited uses such as rubber blocks, saving resources and import substitution effect, and landfilling and incineration of waste. Can prevent environmental pollution First and we can expect a sustainable effect.

EPDM rubber, surface activated powder, rubber recycling

Description

Ethylene-Propylene Diene Monomer (EPDM) products by the utilization of Reclaimed EPDM powder

1 is a graph showing the change in tensile strength according to the content of the recycled EPDM rubber surface activation powder according to the present invention

Figure 2 is a graph showing the change in elongation rate according to the content of the recycled EPDM rubber surface activation powder according to the present invention

Figure 3 is a graph showing the 100% modulus change according to the content of the recycled EPDM rubber surface activation powder according to the present invention

Figure 4 is a graph showing the tensile strength change rate according to the heat resistance temperature according to the content of the recycled EPDM rubber surface activation powder according to the present invention

5 is a graph showing the change in elongation rate according to the heat resistance temperature according to the content of the recycled EPDM rubber surface activation powder according to the present invention

6a to 6b are photographs of optical microscopic measurement results of the fracture surface of the rubber sample according to the present invention, where 6a is a surface dispersion degree of a solid sample without mixing recycled EPDM rubber surface-activated powder to a new EPDM rubber material, and 6b is a new material Surface Dispersion of Sample (T-3) Mixing Recycled EPDM Rubber Surface Activated Powder in 75:25 to EPDM Rubber Material

7 is a cross-sectional view of a molding to which the recycled EPDM rubber surface-activated powder according to the present invention is applied.

The present invention relates to a rubber waste regeneration composition, and more particularly, to a rubber composition and a molded article using a rubber regeneration powder for pulverizing the rubber waste by a high temperature shear grinding method to recycle the chemically activated fine powder as a raw rubber.

With the development of the industry, one of the most commonly used and easily accessible materials around us is polymer materials. In the meantime, much attention has not been paid to the harmful effects of environmental pollution caused by the waste of polymer materials that have been continuously developed, produced, and used.

Therefore, with the recent focus on the environment, we are deeply interested in the problem of post-treatment of products made of polymer materials, which have become an essential material in our lives. However, the amount and type of the products made of the polymer material is currently numerous, and thus a large amount of polymer waste is generated, which is a problem that should not be left anymore.

The properties of polymers, including natural polymers such as elastomers, synthetic fibers, plant fibers, wood and leather, are sensitive to their chemical and microscopic physical structures, which are very different from those of ceramics and metals. . In principle, the physical properties of all polymeric materials are similar, and they are affected in a similar way by external influences. Typically, their shape and structure can be varied by the effects of time, temperature, and surrounding media, and special effects during use, and can vary widely and flexibly.

Among the various types of polymer materials, most rubber wastes generated at present are being treated by energy recycling by incineration. The most feasible of the various approaches conducted for the purpose of recycling is the direct application of impact fillers through fine powdering of rubber and the pyrolysis or microwave for increased reaction surface area through powdering. Although research into a method of separating crosslinks through various surface activation such as (microwave) irradiation is being conducted, it is difficult to expect a uniform and reproducible dewatering effect.

Recently, recycled rubber has been developed and applied to various uses such as building materials. However, compared to developed countries, domestic waste rubber recycling technology is only a rudimentary level, and its use is limited because its performance is not good. Not even secured.

In addition, the recognition of the importance of environmental protection and conservation of natural resources is also improving people's awareness of this. The development of various industrial technologies was rapid through World War II, and the polymer industry was no exception. Therefore, the rapid increase in the use of high-molecular materials, including disposables, has led to the generation of so much waste, which is one of the leading causes of environmental pollution today.

In recent years, countries have been interested in environmental issues, and it is predicted that environmental technology is one of the most important technologies in the 21st century. Therefore, related manufacturing companies need to solve environmental problems, especially for export items, to make production activities possible. It is expected to be. The world is researching for the 100% total recycling system of automobiles, and among them, the fine powder of rubber, surface treatment technology, and kneading technology are required.

Given the current technological paradigm, the two main key processes for the recycling of rubber materials are size reduction and devulcanization.

The fine grinding technology is to increase the surface area through granulation of agglomerated rubber forms to improve the reactivity in subsequent processes, and the degassing / desulfurization technique is a crosslinking agent added to the compounded rubber to give elasticity and restoring force, which is a characteristic of the rubber material. It is a technique for recovering the raw rubber state before molding by breaking the cross-linked structure formed while the rubber product is molded by reverse. The trends and characteristics of domestic and foreign rubber recycling related technologies for each of the above technologies are as follows.

First, a description will be given of the fine grinding technique (Size Reduction).

With the current commercially available grinding technology, it is not unusual to pulverize agglomerated rubber to a particle size of less than 1 mm. When the rubber mass is crushed by a general high-speed or shear grinding method, most of the input energy is lost to thermal energy or sound energy, and powder of a desired particle size shows very low energy efficiency.

This is because rubber crushes with low hardness and elasticity are not easily crushed on the grinding blades in the grinder, but the mechanical energy applied is lost in the form of heat and sound as they travel around the grinder. There is a problem that causes a change.

The main technologies for reducing energy loss and deterioration of the rubber properties due to such low hardness and elasticity are mechanical room temperature crushing technology, frozen crushing technology and air-cooled crushing technology.

The mechanical ambient crushing technology (Ambient Process) is a process that has been used for a long time has been used a lot in the manufacture of recycled powder such as waste tires, the powder particle size produced by this process is about 2 ~ 3㎜ but the recent cracker mill (cracker) The development of technology using a mill enables the production of rubber powder of about 400 μm. The main process is a crushing and crushing process that consists of multiple stages to gradually reduce the particle size, and is an accessory process consisting of facilities such as a magnetic separator, a fiber separator, and a vibrating particle size separator.

However, due to the weak economy, it is difficult for private companies to participate. Currently, Korea Resources Reclamation Corporation applied this method in 1998 to process 2 million used tires annually to produce 9,000 tons of rubber powder. Since the production particle size is 2 to 3mm, it is mixed with a urethane binder in the form of a circular use and is converted to a low-grade use such as a rubber sidewalk block or a rubber asphalt pavement.

The cryogenic crushing process (Cryogenic Process) is a relatively recently commercialized technology that uses a liquid nitrogen or LNG as a refrigerant to instantaneously increase the hardness of rubber and then grind to produce rubber powder. The particle size of the produced rubber powder is 150 In the range of ˜800 μm. This treatment technique is widely used to shred / crush the composite material in addition to the waste tires. Currently, as a representative commercialization of this method, Kolon Construction, along with Korea Gas Corporation, has a waste tire crushing system (KCR System) using LNG cold heat from 1997 to 2003 with funding from the Ministry of Commerce, Industry and Energy. It was developed with a plan and aimed to produce recycled rubber material to replace imported natural rubber, but it is currently used in low grade for construction materials such as rubber asphalt.

Overseas technologies include German Intec, Czech Reffor Recycling and Japan's Hosokawa Polymer Systems. Among these, low-cost cooling technology using Hosokawa's natural refrigerant deposits the crushed material into refrigerants such as liquid nitrogen. Compared to the cooling method, there is an advantage of reducing the cooling cost, but this is also difficult to expect the raw material of rubber powder with low fine particle yield as in the domestic KCR system.

The air-cooled crushing technology (TXML-25 Process) is a process of manufacturing rubber powder by cooling the rubber crushed material with cold air to -60 ~ -90 ℃ and then crushing / crushing it, CRT (Cryogenic) developed by the US SP Reclamation It is similar to the Rubber Technology method and is being tested by Tubahold, Czech Republic.

Second, the desulfurization / desulfurization technique will be described as follows.

Until now, various techniques such as ozone treatment, ultrasonic treatment, microwave treatment, corona discharge, supercritical counting, UVtreatment, pyrolysis, de-link system, hydrolysis, and catalysis have been used. While most of them require enormous energy, it is difficult to expect uniformity and reproducibility of the degassing effect during treatment, which requires additional equipment and additional processes.

Currently, the most commonly recognized dehydration method is a de-link system, in which a degreasing reaction such as thiazole or paraffin oil is added to a rubber scrap crushed to around 5 mm, and then dehydration reaction occurs at high temperature and high pressure in an autoclave, or Hakke It is a method that induces degassing reaction physicochemically by kneading with high shear in Mixer. However, this is mostly due to the fact that the degree of dehydration is small when measuring the degree of crosslinking after the reaction, or the dehydration reaction is carried out, but it takes too long to perform the dehydration reaction, and the material property as a material is severely deteriorated, and the reaction is generated by the generation of harmful vapor together with the reaction. As well as the environment, there is a problem that causes secondary environmental pollution is also being avoided.

The present invention is to solve the above problems, the high temperature of Patent No. 10-0530609 (name of the invention: high temperature fine powdering apparatus of vulcanized rubber material and method of using vulcanized recycled rubber material) registered by the present applicant Rubber composition using EPDM rubber regenerated powder that can be pulverized thermosetting EPDM rubber waste by using a fine powdering device, and mixed the pulverized powder and EPDM rubber raw material at a certain ratio and recycled as raw material rubber in combination with other additives and The purpose is to provide a molded article.

In other words, in the present invention, it is impossible to recycle at all for raw material purposes, and thus it is recognized as a low value, and environmental conservation and cost reduction along with resource recycling of EPDM rubber wastes releasing large amounts of dioxin by inadequate combustion conditions during incineration treatment. In addition, the present invention aims to provide a highly practical method of recycling waste EPDM rubber, which can be expected to replace imports of emulsified products that depend on the total import.

The rubber composition using the EPDM rubber regeneration powder according to the present invention for achieving the above object, by grinding the waste EPDM rubber with a high temperature fine powdering device to make a regeneration EPDM rubber surface activation powder, the regeneration EPDM rubber surface activation powder It is characterized by mixing the new rubber raw material in a certain ratio, and adding a reinforcing agent and various additives in a certain ratio.

Here, the mixing ratio of the regenerated EPDM rubber surface-activated powder and the new rubber raw material is 10 to 90 PHR (Part Per Hundred) parts by weight of the new rubber raw material, and the regenerated EPDM rubber surface activated powder is insufficient of the new rubber raw material. It is characterized by mixing at 90 to 10 parts by weight PHR.

The new rubber raw material is characterized in that the EPT 3045.

The reinforcing agent and various additives, 10 to 100 PHR parts by weight of the reinforcing agent, 5 to 50 PHR parts by weight of the plasticizer, 1 to 10 PHR parts by weight of the vulcanization accelerator 1, 1 to 10 PHR parts by weight of the vulcanization accelerator 2, accelerator To 1 to 5 PHR parts by weight, the vulcanizing agent is characterized by adding to the mixture of the new rubber material and the recycled EPDM rubber surface activation powder in the composition of 1 to 5 PHR parts by weight.
The most preferred amount of reinforcing agent and various additives is 60 PHR parts by weight of reinforcing agent, 30 PHR parts by weight of plasticizer, 5 PHR parts by weight of vulcanization accelerator 1, 1 PHR parts by weight of vulcanization accelerator 2, 1.5 PHR parts by weight of accelerator, A vulcanizing agent is added to the mixture of the new rubber raw material and the regenerated EPDM rubber surface activated powder in a composition of 1.5 parts by weight of PHR.

The reinforcing agent is provided with carbon black (FEF), the plasticizer is a paraffin compound oil, the vulcanization accelerator 1 is zinc oxide (ZnO), the vulcanization accelerator 2 is stearic acid (S / A), the accelerator is MBT (MercaptoBenzo Thiazole) and TMTM (TetraMethylThiuram Monosulfide), the vulcanizing agent is characterized by having sulfur (Sulfide), respectively.

The rubber composition and the molded article using the EPDM rubber regenerated powder according to the present invention having the above characteristics will be described in more detail with reference to the accompanying drawings.

First, Patent No. 10-0530609, filed on February 26, 2004 by Applicant and registered on November 16, 2005, describes a high temperature fine grinding apparatus of a rubber material.

The high temperature fine grinding device includes a hollow cylinder having grooves formed at equal intervals, and a conveying screw provided inside the cylinder and having a helical tooth formed on the outer surface thereof to compress and crush the rubber material injected from the inlet and to the outlet. It is configured to include a rotational force providing means axially coupled to the feed screw to provide a rotational force.

The waste EPDM rubber is pulverized using the high temperature fine powdering apparatus as described above to form powder.

That is, the waste EPDM rubber is recovered and initially pulverized to a particle size of about 10 to 30 mm using a conventional low speed mill.

In addition, the pulverized EPDM rubber is introduced into the inlet of the high temperature fine powdering device to maximize the internal energy accumulation in the object to be shredded under special shearing force under high temperature and high pressure environment, and reaches the critical point and explodes the energy through three times. As it is pulverized, it is discharged as a fine powder. Accordingly, efficient surface ablation by fine pulverization and surface activity is simultaneously implemented to obtain a regenerated EPDM rubber powder in a chemical surface activation state having substantially the same level of physical properties as virgin rubber.

In addition, the recycled EPDM rubber powder and the new EPDM rubber material using the above-described high-temperature fine powdering apparatus are mixed at a predetermined ratio, and the reinforcing agent and various additives are mixed at a constant ratio to confirm the degree of surface dispersion and heat resistance in physical properties, and to activate the EPDM surface. The proper mixing ratio in the composition of the rubber and the possibility of producing the molded article are judged.

As the raw material rubber used in the present invention, new EPDM rubber (EPT4035, MITSUI, Japan) and recycled powder EPDM rubber powder (RE-PDM 200, Poly One, Korea) were used.

Fast extruder furnace (FEF) Black N-550 grade Korea Carbon products were used as reinforcing agents.

Other additives include P-90 oil, which is a plasticizer, and a small amount of naphthenic and aromatic oils in paraffin oil, Sechang Petroleum and Korea, Zinc oxide (ZnO, Hanil Zinc, Korea), Stearic acid (S / A, LG, Korea), a vulcanization accelerator, MBT (MercaptoBenzo Thiazole) and TMTM (TetraMethylThiuram Monosulfide) (Tongyang Chemical, Korea) and sulfur (S, Miwon, Korea) Was used.

The recycled EPDM rubber powder applied to the above is about 200 µm in size and finely powdered waste EPDM rubber collected in scrap form by the above-described high temperature fine powdering apparatus.

In addition, the rubber molding using the recycled EPDM rubber powder according to the present invention is as follows.

First, 10 to 90 parts by weight of EPDM new rubber (EPT 3045) and 90 to 10 parts by weight of the recycled EPDM rubber surface active powder are mixed.

That is, the two rubber materials are mixed so that the mixed weight part of the EPDM new rubber and the regenerated EPDM rubber surface activation powder is 100.

10 to 100 parts by weight (preferably 60 parts by weight) of carbon black (FEF N-550) as a reinforcing agent, and 5 to 50 parts by weight of paraffin compounding oil (P-90) as a plasticizer (preferably Is 30 PHR parts by weight), vulcanization accelerator 1 (ZnO) 1 to 10 PHR parts (preferably 5 PHR parts), vulcanization accelerator 2 (stearic acid (S / A)) 1 ~ 10 PHR weight Parts (preferably 1 PHR parts), accelerators (MercaptoBenzo Thiazole (MBT) and TetraMethylThiuramMonosulfide (TMTM) 1 to 5 PHR parts (preferably 1.5 PHR parts each), vulcanizing agent (Sulfide) To 1-5 PHR parts by weight (preferably 1.5 PHR parts by weight) and the like is added to the mixture of the EPDM new rubber and the regenerated EPDM rubber surface activation powder.

In order to measure the physical properties according to the mixing ratio of the EPDM new rubber and the regenerated EPDM rubber surface activation powder, the mixing ratio of the two rubber materials was changed, and the reinforcing agent and the additive were mixed to make the composition sample.

That is, in order to find the limiting mixing ratio of the regenerated EPDM rubber surface activation powder in the blended composition, a sample in which 15 parts by weight of the regenerated EPDM rubber surface activation powder is mixed from a specimen (T-1) having no regenerated powder mixed at all ( T-2), a specimen in which 25 parts by weight of the recycled EPDM rubber surface active powder is mixed (T-3), a specimen in which 35 parts by weight of the recycled EPDM rubber surface activated powder is mixed (T-4), and the regeneration EPDM Five kinds of compound specimens, such as a specimen (T-5) in which 85 parts by weight of rubber surface active powder was mixed, were prepared, and the change in physical properties of the EPDM rubber surface active powder with increasing mixing amount was measured.

Table 1 below shows the mixing ratios of the rubber materials and various additives applied in the present invention.

TABLE 1

Material name T-1 T-2 T-3 T-4 T-5 EPT3045 100 85 75 65 15 Recycled powder - 15 25 35 85 FEF 60 60 60 60 60 P-90 30 30 30 30 30 ZnO 5 5 5 5 5 S / A One One One One One M 0.5 0.5 0.5 0.5 0.5 TS 1.5 1.5 1.5 1.5 1.5 S 1.5 1.5 1.5 1.5 1.5 Total 199.5 199.5 199.5 199.5 199.5

In the master batch formulation method and specimen preparation of the composition, all the specimens used in the present invention were formulated in a first kneader according to ASTM D3192, and a 1.6-liter hermetic mixer (sealing) was prepared in the first kneading. The initial temperature was maintained at 40 ℃, the final temperature of 120 ~ 130 ℃ using a speed of 44 RPM.

The feeding sequence was added in order of recycled EPDM rubber surface activated powder, carbon black and chemicals ground using new rubber and high temperature fine powdering equipment, and blended for 5 minutes.

After the kneading, the mixture was sufficiently left for 6 hours at room temperature in consideration of the elastic structural thermal stability of the rubber, and the promoter was mixed for 10 minutes at about 80 ° C. in a two-roll mill. Each specimen for the measurement of various physical properties was set to a proper crosslinking time at 160 ℃, was prepared in a plate state at a pressure of 120Kg / cm2 pressure plate using a pressure plate heater and the specimen was prepared in dumbbell No. 3 using a specimen cutter.

Tensile properties were prepared according to ASTM D-412 and measured at a rate of 500 mm / min at 25 ° C. using a tensile tester (Instron 10).

In order to investigate the effect on the heat resistance, the tensile test was performed after the heat-aging of the dumbbell-type specimen for tensile test at 168 hours in an oven exposed to air at 100 ° C., 120 ° C., 150 ° C., and 180 ° C., respectively.

In order to test the resistance characteristics in the antifreeze, water and the antifreeze were mixed at a ratio of 50:50, and left at 115 ° C. for 168 hours to measure tensile properties, and the change rate of the basic properties was measured.

In order to observe the surface dispersion degree of the mixture, the fracture surface of the specimen after the tensile test was examined at an enlarged ratio of 60 times using an electron microscope.

The physical property measurement and the characteristic analysis of the result of the present invention were discussed through the following implementation.

◎ Physical property

1 is a graph showing the change in tensile strength according to the content of the recycled EPDM rubber surface activated powder according to the present invention, Figure 2 is a graph showing the change in elongation rate according to the content of the recycled EPDM rubber surface activated powder according to the present invention, 3 is a graph showing a 100% modulus change according to the content of the recycled EPDM rubber surface activated powder according to the present invention.

The new EPDM rubber and the regenerated EPDM rubber surface-activated powder were blended to measure the hardness, tensile strength, elongation, and 100% modulus of the mixture.

As the mixing ratio of the regenerated EPDM rubber surface activation powder increased, the tensile strength and the elongation rate gradually decreased, and the hardness increased.

That is, as can be seen in Figure 1, the specimens (T-2) to similar to the specimen (T-5), but as the mixing ratio of the regenerated EPDM rubber surface activation powder increases the tensile strength is slightly reduced compared to the new material It is true, but it meets EPS rubber material standard of KS standard.

In addition, as can be seen in Figures 2 and 3, as the mixing ratio of the recycled EPDM rubber surface activation powder increases, the elongation at break and modulus value also tends to increase.

As a whole, as the regenerated EPDM rubber surface activated powder is filled in the molecular chain, shortening the bond length of the mixed rubber decreases the elongation rate, and a large increase in the modulus value compared to the tensile strength is stable between the EPDM rubber surface activated powder particles. It seems to be due to the reorganized mutual attraction.

In addition, it can be judged that the spatial arrangement of one particle is stabilized or immobilized to exhibit necessary characteristics in dynamic performance.

◎ heat resistance

Figure 4 is a graph showing the tensile strength change rate according to the temperature of the regeneration EPDM rubber surface activation powder according to the present invention, Figure 5 is the elongation rate by heat resistance according to the content of the regeneration EPDM rubber surface activation powder according to the present invention It is a graph showing the change.

In order to measure the heat resistance characteristics of the mixture in which the regenerated EPDM rubber surface-activated powder was added to the new EPDM rubber as shown in [Table 1], each mixed rubber specimen was 168 hours at 100 ° C, 130 ° C, 150 ° C and 180 ° C. After aging, the hardness, tensile strength, elongation, etc. of the mixture were measured.

First, as shown in FIG. 4, the tensile strength change rate is varied up to 150 ° C., but shows a uniform change rate, and a rapid change rate is shown in the 180 ° C. aging test, and particularly in the 180 ° C. aging test, the regenerated EPDM rubber. As the amount of surface-activated powder increases, the rate of change of tensile strength is low. This is because the temperature condition of 180 ℃ is the limit temperature of the mixture, and the new 100% material shows a sharp change in tensile strength at the limit temperature, but the limit of the continuity of the molecular chain of the new EPDM rubber material is reduced as the regenerated EPDM rubber surface activated powder is filled. It is judged that the change in tensile strength due to heat is small even at temperature.

On the other hand, as shown in Figure 5, although the rate of change according to the temperature rise is large, the rate of change of elongation rate with the increase of the content of the recycled EPDM rubber surface active powder shows a constant result. It is believed that this regenerated EPDM rubber surface activated powder does not lower the molecular chain bond length by heat.

◎ Surface dispersion and appearance

Figure 6 is a photograph of the optical microscope measurement results of the fracture surface of the rubber sample according to the present invention, (a) is a surface dispersion degree of the solid sample without mixing the recycled EPDM rubber surface activation powder in the new EPDM rubber material, (b) Is the surface dispersion degree of the sample (T-3) which mixed 75:25 recycled EPDM rubber surface activation powder with new EPDM rubber material.

In order to measure the surface dispersion of the mixture of the regenerated EPDM rubber surface-activated powder and the new EPDM rubber in the ratio as shown in [Table 1], it was measured using an optical microscope with a magnification of 60 times.

As can be seen in FIG. 6, the surface dispersion state (b) of the sample (T-3) in which the recycled EPDM rubber surface-activated powder was mixed at 75:25 with the new EPDM rubber material is equal to 100% of the new EPDM rubber. It can be judged that, rather, the blooming phenomenon appearing on the surface of the new EPDM rubber was able to obtain the effect of improving the surface properties removed as the recycled EPDM rubber surface activation powder is mixed.

Meanwhile, 300 parts by weight of the regenerated EPDM rubber surface-activated powder was mixed in a new EPDM raw material rubber to mix a master batch, and then a molded product was formed using the master batch.

7 is a cross-sectional view of a molding to which the recycled EPDM rubber surface activated powder according to the present invention is applied.

As a result of manufacturing a molding using the recycled EPDM rubber surface activated powder, it is possible to manufacture a free-form molding that was not expected in a rubber block product in which conventional waste rubber chips are binder-molded, and a stiffness resilience that can be expected from a rubber material and Due to its excellent physical properties, it is possible to produce a rubber block with an amazing HIC value of 2470 mm.

In Table 1 and FIGS. 1 to 6, only the case where the regenerated EPDM rubber surface activation powder is mixed with new rubber up to 85:15 is shown, but as a result of the test, the regenerated EPDM rubber surface activation powder Mixing up to 90 PHR parts by weight of new rubber was found to be of sufficient value in terms of tensile strength, elongation and surface dispersion.

In the rubber composition and the molded article using the recycled EPDM rubber powder according to the present invention as described above, the following effects were obtained.

First, it is difficult to grind conventional grinders due to elasticity expressed by vulcanization, and in particular, cold grinding using liquid nitrogen is used for uncrushing, so that grinding costs are high and productivity is low.

However, the present invention maximizes the activation energy inside the molecule to make the surface and the inside of the powder porous and impart an activated reactor to the surface by the repetitive high temperature cutting force to activate the surface having a chemical activation that the conventional powder cannot have. It is possible to realize the high value added of raw materials of wastes with the excellent recovery of physical properties expressed by partially mixing the powder into new materials as raw materials.

Second, since the recycled EPDM rubber surface activated powder is mixed with the new raw material, the recycled EPDM rubber surface activated powder breaks some of the sulfur bonds in the molecular chain, so that the appropriate vulcanization time is slightly longer, and remains in the recycled EPDM rubber surface activated powder. One accelerator affects the mixture, resulting in shorter scorch times.

Third, the regenerated EPDM rubber surface-activated powder inhibits molecular bonding during vulcanization, so that the tensile strength and elongation rate are slightly reduced, but the modulus is improved due to the binding force between the regenerated EPDM rubber surface-activated minutes.

Fourth, as the content of the regenerated EPDM rubber surface-activated powder increases, the change in physical properties is severe at the limit temperature, but does not affect the viscoelastic change of the mixture during thermal aging at a commercial temperature condition.

Fifth, when the recycled EPDM rubber surface-activated powder is added to the new rubber by 25 weight ratio, the particle dispersity equivalent to that of the new EPDM rubber can be expected, and the blooming phenomenon that impairs the appearance quality is improved.

Sixth, it is possible to mold complex and free-form moldings by the same process as the existing rubber raw materials, and with the emergence of excellent elastic restoring force, the amazing value of 2470 mm in the head injury damage part, the most sensitive standard for flooring for children's playgrounds You can get it.

Seventh, the efficient grinding of the waste rubber material and the effective surface dewatering by the surface activity are realized simultaneously, thereby obtaining the material surface recycling powder (Material Recycling) with the physical properties almost the same as the virgin rubber. It is possible to reapply it as a raw material rubber, so that it is not only expected to substitute import effect, but also to develop an environmentally friendly recycling method.

Claims (7)

The waste EPDM rubber is pulverized with a high temperature fine powdering apparatus to make a recycled EPDM rubber surface activated powder, and the recycled EPDM rubber surface activated powder is mixed with a new rubber raw material at a predetermined ratio, and a rubber is formed by adding a reinforcing agent and various additives. EPDM) rubber composition using recycled powder, The mixing ratio of the recycled EPDM rubber surface activated powder and the new rubber raw material is 10 to 90 parts by weight of the new rubber raw material, and the recycled EPDM rubber surface activated powder is mixed to 90 to 10 parts by weight, The reinforcing agent and various additives, 10 to 100 PHR parts by weight of the reinforcing agent, 5 to 50 PHR parts by weight of the plasticizer, 1 to 10 PHR parts by weight of the vulcanization accelerator 1, 1 to 10 PHR parts by weight of the vulcanization accelerator 2, accelerator 1 to 5 parts by weight of PHR, the vulcanizing agent in the composition of 1 to 5 parts by weight of rubber (EPDM) recycled powder, characterized in that the addition of the mixture of the new rubber raw material and the recycled EPDM rubber surface activation powder Rubber composition. The waste EPDM rubber is pulverized with a high temperature fine powdering apparatus to make a recycled EPDM rubber surface activated powder, and the recycled EPDM rubber surface activated powder is mixed with a new rubber raw material at a predetermined ratio, and a rubber is formed by adding a reinforcing agent and various additives. EPDM) rubber composition using recycled powder, The mixing ratio of the recycled EPDM rubber surface activated powder and the new rubber raw material is 10 to 90 parts by weight of the new rubber raw material, and the recycled EPDM rubber surface activated powder is mixed to 90 to 10 parts by weight, The reinforcing agent and various additives, 60 PHR parts by weight of reinforcing agent, 30 PHR parts by weight of plasticizer, 5 PHR parts by weight of vulcanization accelerator 1, 1 PHR parts by weight of vulcanization accelerator 2, 1.5 PHR parts by weight of accelerator, The rubber composition using rubber (EPDM) recycled powder, characterized in that added to the mixture of the new rubber raw material and the recycled EPDM rubber surface activation powder in the composition of 1.5 PHR parts by weight. The method according to claim 1 or 2, The new rubber raw material is EPT 3045, characterized in that the rubber composition using a rubber (EPDM) recycled powder. The method according to claim 1 or 2, The reinforcing agent is a rubber composition using rubber (EPDM) regeneration powder, characterized in that the carbon black (FEF). The method according to claim 1 or 2, The plasticizer is P-90, the vulcanization accelerator 1 is ZnO, the vulcanization accelerator 2 is stearic acid (S / A), the accelerator is MBT and TMTM, the vulcanizing agent is characterized in that the sulfur is provided (EPDM) Rubber composition using recycled powder. delete delete

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