KR20070034563A - Rubber chip and elastic packing material manufacturing method using elastomer - Google Patents

Abstract

A rubber chip and an elastic packaging material manufacturing method using an elastomer are disclosed. Rubber chip manufacturing method using an elastomer according to the present invention comprises the steps of (a) injecting an elastomer, a block copolymer based on styrene and butadiene, into the kneader, and (b) maintaining the temperature of the elastomer at 50 to 100 degrees Stirring for 1 to 10 minutes under the conditions, and (c) 100 to 500 parts by weight of a predetermined process oil based on paraffin and naphthene base oil based on 100 parts by weight of the elastomer and 2 to 10 minutes Stirring to a degree, (d) adding the filler member within 200 parts by weight with respect to 100 parts by weight of the elastomer, and (e) extrusion drying the stirred mixture within the range of 150 to 230 degrees using a compound machine. And (f) grinding the extruded dried product to a desired size. The rubber chip manufactured according to the present invention does not detect any harmful heavy metal components even in the heavy metal detection test, thereby enabling mass production at an environmentally friendly and reasonable price. In addition, it has thermoplasticity and can be reused. In the case of a rubber chip using a conventional regenerated EPDM, it becomes a thermosetting resin and solves a disadvantage that cannot be reused.

Elastomer, Eco-Friendly, Heavy Metal, Process Oil, Synthetic Rubber

Description

Rubber chip and pavement material manufacturing method using elastomer

1 is a flow chart showing the main process of the rubber chip and elastic packaging material manufacturing method using an elastomer according to an embodiment of the present invention.

The present invention relates to a rubber chip and an elastic packaging material manufacturing method using an elastomer, and more particularly, to a rubber chip and elastic packaging material manufacturing method using an elastomer that is a block copolymer based on styrene and butadiene.

An elastic packaging material is used as a flooring material that gives softness to walking. As an example of such an elastic pavement material, rubber chips are mixed with a urethane binder to be packaged in concrete, asphalt or ascon layers.The elastic pavement material has excellent shock absorption, can reduce fatigue, and has a low risk of injury. It is widely used in APT playground and flooring for sports facilities.

On the other hand, the best material that can replace the demand for turf grass is the present artificial turf. In order to solve the problem of burn and playability, which is a problem of the existing carpet type artificial turf, and to provide the shape and playability similar to that of natural grass Artificial turf with chip and silica sand filling method has been developed and used.

In such an elastic packaging material or artificial grass filling rubber chip, a pulverized product of EPDM (Ethylene-Propylene Rubber), that is, recycled EPDM is frequently used. EPDM is an ethylene propylene rubber, which is an amorphous polymer obtained by the hybridization of ethylene and propylene. It is a binary copolymer of ethylene (propylene) or propylene (propylene) or ethylene (propylene). It is often a ternary copolymer of (Propylene) -diene. EPDM is chemically stable, and the vulcanized material is widely used because its physical properties show intermediate properties between natural rubber and SBR.

However, in the conventional rubber chip and elastic packaging material using EPDM, a large amount of additives are added to cure after vulcanization in order to use EPDM. These additives include heavy metals and dioxins in order to express rubber properties during the manufacturing process. The six major harmful substances are often included, and many harmful substances are generated during combustion as well as hardening, which is undesirable in terms of resource recycling. In addition, there is a problem that the EPDM pulverized product to be used for the elastic packaging material or artificial turf filling rubber chips is insufficient in supply compared to demand.

Nevertheless, in order to supply smoothly, it should be produced using new products, not recycled products. However, elastic packaging materials or artificial turf filling rubber chips using new products have a problem in that they are difficult to manufacture and sell because they are too expensive.

The technical problem to be achieved by the present invention is to provide a rubber chip and an elastic packaging material manufacturing method that can be eco-friendly and mass production.

Rubber chip and elastic packaging material manufacturing method using an elastomer according to the present invention for achieving the above technical problem,

(a) introducing an elastomer, which is a block copolymer based on styrene and butadiene, into a kneader;

(b) stirring the elastomer for 1 minute to 10 minutes under the condition that the temperature is maintained at 50 to 100 degrees;

(c) adding 100 to 500 parts by weight of a predetermined process oil, based on paraffin and naphthene base oil, based on 100 parts by weight of the elastomer and stirring for 2 to 10 minutes;

(d) adding a filler member within 200 parts by weight based on 100 parts by weight of the elastomer;

(e) extrusion drying the stirred mixture within the range of 150 degrees to 230 degrees using a compound machine; And

(f) pulverizing the extruded dried product to a desired size.

In addition, the elastic packaging material manufacturing method using an elastomer according to the present invention,

(g) adding 10 to 30 parts by weight of the acrylic pressure sensitive adhesive based on 100 parts by weight of the rubber chip.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a flowchart illustrating a main process of a rubber chip and an elastic packaging material manufacturing method using an elastomer according to an embodiment of the present invention. Referring to FIG. 1, in the method for manufacturing a rubber chip and an elastic packaging material using an elastomer according to an embodiment of the present invention, first, an elastomer, which is a block copolymer based on styrene and butadiene, is introduced into a kneader (step S100).

Elastomers, which are block copolymers based on styrene and butadiene, have a solid property and basically have rubber-like elasticity and can be re-molded with thermoplastic rubber, but on their own they are not only carbonized but also plasticized. Don't have

The molecular structure of the block copolymer based on styrene and butadiene forms a biphasic structure by mutually using a polystyrene terminal block and an intermediate block of rubber. The double polystyrene phase forms a physical crosslinking point and serves as a crosslinking point of the vulcanized rubber. The rubber mesophase is soft in the product and provides performance as a rubber elastomer. However, an elastomer, a block copolymer based on styrene and butadiene, is a thermoplastic that can be melted and injected by itself as it is formed as a solid through a polymerization reaction in which it is produced as a solid unlike a PVC resin produced through a polymerization reaction in a liquid phase. It should be noted that it is not made of resin.

Next, the elastomer is stirred for 1 to 10 minutes under the condition that the temperature is maintained at 50 to 100 degrees (step S102). This preheating agitation is necessary for easy reaction in the subsequent process. If the temperature is less than 50 degrees, the mixing and reaction in the subsequent process may be insufficient. If the temperature exceeds 100 degrees, the process oil and the elastomer do not react or the elastomer The decomposition may occur.

Next, 100 to 500 parts by weight of a predetermined process oil containing paraffin and naphthene base oil are added to 100 parts by weight of the elastomer, followed by stirring for about 2 to 10 minutes (step S104).

Process oils based on paraffin and naphthene base oils, when mixed with elastomers, which are block copolymers based on styrene and butadiene, give elasticity to the elastomer and give plasticity. Specific properties of the process oil is the specific gravity (15/4 ℃) is 0.852 ~ 0.877 range, the flash point is 160 ~ 280 ℃, kinematic viscosity (40 ℃ cSt) is 8.0 ~ 137.0, the pour point is -45.0 ~ -7.5 ℃, the aniline point is It is sufficient in the range of 90.0 ~ 127.0 ℃. If the process oil is added to less than 100 parts by weight with respect to 100 parts by weight of the elastomer, a non-permeable part of the elastomer is generated. If the process oil exceeds 500 parts by weight, the elasticity is deteriorated through the subsequent process.

Next, the filler member is optionally added within 200 parts by weight based on 100 parts by weight of the elastomer (step S106). The filler member may be selectively added depending on the rubber chip to be manufactured, and for example, calcium carbonate may be used as the filler used to create color and appearance such as stone powder while reducing the unit cost. When the filler member exceeds 200 parts by weight with respect to 100 parts by weight of the elastomer, the overall bondability of the filler member may be easily broken. More preferably, a lubricant, such as a pigment, a general purpose polystyrene (GPPS), a wax, or the like, is added to an appropriate amount, preferably within 5 parts by weight, based on 100 parts by weight of the elastomer, and then mixed with the filler to suit the packaging material. It is possible to give color and texture.

Now, the compound is extruded to dryness in a range of 150 to 230 degrees using a compound machine (step S108). Finally, the production of the rubber chip is completed by crushing the resultant extruded result to the desired size (step S110).

Rubber chips using conventional EPDM and rubber chips manufactured according to the method were compared and measured for the detection of major heavy metals along with tensile strength, elongation and hardness at the Korea Testing Institute, 88-2, 8ga, Yeongdeungpo-dong, Yeongdeungpo-gu, Seoul. Measurement results for the rubber chip using a conventional EPDM is shown in Table 1 below.

Test Items unit Result Test Methods The tensile strength MPa 1.2 KS M 6518: 2001 Elongation % 82 KS M 6518: 2001 Hardness - 55 KS M 6518: 2001 Tensile Strength Change Rate % 51.0 KS M 6518: 2001 Pb mg / kg 17 ISO 6101-2: 1997: ICP) CD mg / kg Not detected ISO 6101-2: 1997: ICP) Hg mg / kg Not detected US EPA Method 3052: 1996 (ICP) Cr mg / kg Not detected Compliant with DIN 53314 1996

Referring to Table 1, lead (Pb) was detected in excess of 5 mg / kg, which is an allowable reference value in the conventional rubber chip using EPDM. In addition, measurements of other products using EPDM often detect not only lead (Pb) but also mercury (Hg) or chromium (Cr).

On the other hand, the measurement results for the rubber chip manufactured according to the method is shown in Table 2 below.

Test Items unit Result Test Methods The tensile strength MPa 6.0 KS M 6518: 2001 Elongation % 550 KS M 6518: 2001 Hardness - 50 KS M 6518: 2001 Tensile Strength Change Rate % 15.2 KS M 6518: 2001 Pb mg / kg Not detected ISO 6101-2: 1997: ICP) CD mg / kg Not detected ISO 6101-2: 1997: ICP) Hg mg / kg Not detected US EPA Method 3052: 1996 (ICP) Cr mg / kg Not detected Compliant with DIN 53314 1996

Referring to Table 1, the elongation rate is much better than that of the conventional rubber chip, and data that satisfies the normal range in tensile strength and elongation rate were obtained, and lead, cadmium, mercury, and chromium were not detected at all. Since no heavy metal is detected in the conventional rubber chip using recycled EPDM, since it is itself a recycled product, substances harmful to human body including heavy metals are detected. It can be seen that the material is very environmentally friendly, with little material detected and well below the acceptance criteria.

In addition, in order to re-verify the rubber chips manufactured according to the above method, the hardness, tensile strength, elongation, and the like under the hardness and low temperature environment were evaluated by the Korea Institute for Living Environmental Studies, Gasan-dong, Geumcheon-gu, Seoul. The evaluation results are shown in Table 3 below.

Test Items unit Test result Hardness (Hs: Shore A Type) - 35 KS M 6518: 2001 Low temperature test -30 ± 1 ℃ for 24 hours Hardness - 46 Tensile Strength (Test Piece: Dumbbell Type 3) kgf / ㎠ {MPa} 62.8 {6.2} Elongation % 750 Tensile Stress at 300% Tensile kgf / ㎠ {MPa} 13.8 {1.4} Aging test 100 ± 1 ℃, 70 hours Tensile Strength Change Rate % 11 Compressed permanently reduced 70 + 1 ℃, 22 hours % 67 Cold resistance permanent compression rate 30 ± 1 ℃, 22 hours % 72 Ozone crack test 80 ± 5 pphm, 40 ± 3 ℃, 20% elongation, 72 hours - No crack

Referring to Table 2, the hardness and hardness under low temperature test environment are in the range of 20 to 65 in the conventional rubber chip, the tensile strength is in the range of 50 to 80 in the conventional rubber chip, and other elongation is also common rubber. Good or similar measurements were obtained with the chip.

In addition, in order to verify the detection of the heavy metal components of the rubber chip manufactured according to the present invention and to check the harmful components again, the hazardous component detection test was conducted at the Korea Testing Institute of Yeongdeungpo 8-ga, Yeongdeungpo-gu, Seoul. The test results are shown in Table 4.

Test Items unit Result Test Methods Pb mg / kg Not detected ISO 6101-2: 1997 (ICP) CD mg / kg Not detected BS EN 1122: 2001 (Method B, ICP) Hg mg / kg Not detected US EPA Method 3052: 1996 (ICP) Cr (Vl) mg / kg Not detected DIN 53314: 1996 Total-PBBs mg / kg Not detected US EPA 8270D (GC / MS) Mono-BB mg / kg Not detected US EPA 8270D (GC / MS) Di-BB mg / kg Not detected US EPA 8270D (GC / MS) Tri-BB mg / kg Not detected US EPA 8270D (GC / MS) Tetra-BB mg / kg Not detected US EPA 8270D (GC / MS) Penta-bb mg / kg Not detected US EPA 8270D (GC / MS) Hexa-bb mg / kg Not detected US EPA 8270D (GC / MS) Hepta-bb mg / kg Not detected US EPA 8270D (GC / MS) Octa-bb mg / kg Not detected US EPA 8270D (GC / MS) Nona-bb mg / kg Not detected US EPA 8270D (GC / MS) Deca-bb mg / kg Not detected US EPA 8270D (GC / MS) Total-PBDEs mg / kg Not detected US EPA 8270D (GC / MS) Mono-PBDEs mg / kg Not detected US EPA 8270D (GC / MS) Di-PBDEs mg / kg Not detected US EPA 8270D (GC / MS) Tri-PBDEs mg / kg Not detected US EPA 8270D (GC / MS) Tetra-PBDEs mg / kg Not detected US EPA 8270D (GC / MS)

Referring to fabric 4, the rubber chip produced by the method according to the present invention did not detect any harmful components including any heavy metals and substances related to dioxins.

As described above, the rubber chip manufactured according to the above method is made of elastomer, which is a block copolymer based on styrene and butadiene, as a main raw material, and thus the manufacturing cost is low, and additives that may cause vulcanization, heavy metals, and dioxins are added. Excellent in tensile strength, elongation and hardness

In addition, the rubber chip manufactured according to the above method does not detect any harmful heavy metal components even in the heavy metal detection test, thereby enabling mass production at an environmentally friendly and reasonable price.

In addition, the rubber chip manufactured according to the above method has thermoplasticity and can be reused. Thus, in the case of a rubber chip using a conventional regenerated EPDM, the rubber chip becomes a thermosetting resin, thereby solving the disadvantage that it is impossible to reuse.

On the other hand, the above advantages will be the same advantage in the elastic packaging material manufacturing method that can be made by adding an adhesive to the intermediate process prepared according to the present invention.

In addition, the rubber chip and the elastic packaging material manufacturing method using the elastomer according to the present invention as described above may be applied to the manufacturing method of bio-ceramic, antimicrobial agents, and anion generating materials by the selective use of additives and pressure-sensitive adhesives.

As described above, the rubber chip manufactured by the rubber chip and the elastic packaging material manufacturing method using the elastomer according to the present invention can be mass-produced at an eco-friendly and reasonable price because no harmful heavy metal components are detected at all in the heavy metal detection test. In addition, it has thermoplasticity and can be reused. In the case of a rubber chip using a conventional regenerated EPDM, it becomes a thermosetting resin and solves a disadvantage that cannot be reused.

Claims (2)

(a) introducing an elastomer, which is a block copolymer based on styrene and butadiene, into a kneader; (b) stirring the elastomer for 1 minute to 10 minutes under the condition that the temperature is maintained at 50 to 100 degrees; (c) adding 100 to 500 parts by weight of a predetermined process oil, based on paraffin and naphthene base oil, based on 100 parts by weight of the elastomer and stirring for 2 to 10 minutes; (d) adding a filler member within 200 parts by weight based on 100 parts by weight of the elastomer; (e) extrusion drying the stirred mixture within the range of 150 degrees to 230 degrees using a compound machine; And (f) crushing the resultant extrusion-dried product to a desired size; rubber chip manufacturing method using an elastomer comprising a. The method of claim 1, (g) adding 10 to 30 parts by weight of the acrylic pressure-sensitive adhesive with respect to 100 parts by weight of the rubber chip.

Images