KR101387601B1 - Environmental-friendly elastic chips for artificial lawn - Google Patents

Abstract

The present invention relates to an antistatic coating chip for artificial lawn and a manufacturing method of the same and, more particularly, to an eco-friendly antistatic coating chip for artificial lawn and a manufacturing method of the same which can prevent the chips from being stuck to a user. The present invent is formed by forming a coating layer on the surface of reclaimed rubber chip or new rubber chip, wherein the coating layer consists of 0.5 to 1 wt% of hydrophilic fiber, 0.5 to 1 wt% of biodegradable fiber, and 15 to 30 wt% of binder mixture in reference to 100 wt% of rubber chip. The artificial lawn filler according to the present invention can contain moisture for a long time without using additional antistatic agents, such as conductive polymer, thereby providing antistatic properties.

Description

Antistatic artificial grass filling coating chip and manufacturing method {Environmental-Friendly Elastic Chips for Artificial Lawn}

The present invention relates to an antistatic artificial grass filling coating chip and a method for manufacturing the same, and more particularly, to an antistatic eco-friendly artificial grass filling rubber coating chip for preventing the phenomenon of sticking to the body of a grass user and a method of manufacturing the same. It is about.

Recently, in order to prevent safety accidents during use and to obtain landscaping effects, artificial turf fields are being constructed at elementary schools, junior high schools, and high schools and local governments. Artificial turf is composed of grass grass with the shape of grass and filling material to provide elasticity, and various elastic chips are used as the filling material. Initially, waste materials such as waste tires and industrial waste rubber were used, but the waste materials contained in the waste materials are sharply reduced due to concerns about health or environmental problems. Instead, a filler using a new material rubber chip such as urethane rubber has been developed and used.

Korean Patent No. 780229 issued to Taeheung et al. Discloses a novel thermoplastic elastomer resin composition comprising a styrenic block copolymer, an olefin polymer, a process oil, a resin stabilizer and a pigment as thermoplastic elastomer chips for artificial turf.

In Korean Patent No. 995211 granted to Matsuyuki, a thermoplastic elastomeric chip for artificial turf is used as a thermoplastic elastomer and a cork powder, a synthetic resin, a graft copolymerized elastomer, a folw paraffin, Or a mineral oil, and an inorganic material.

Korean Patent No. 1122268 issued to Cassiopeo Co., Ltd. discloses a polylactide aluminum softening agent for mixing natural rubber with additives, a polychlorinated aluminum flocculant for constituting small particles, a gluing agent for fusing natural rubber with natural loess powder, Stearic acid for accelerating taraldehyde crosslinking agent and crosslinking agent is added to the crosslinking accelerator and the crosslinking accelerator for carbon black and phenylbetanaphthylamine which is not aged in the sun to the sunlight crack antioxidant, And then the mixture is cut into a mat using a high-temperature molding machine and cut with a cutting machine to produce a filler for artificial turf.

Instead of using these new materials, methods for treating waste products and using them as fillers for artificial turf are being developed. Patent No. 869585 granted to Greenchem Co., Ltd. is a chip for filling artificial turf plant material, which comprises 30 to 90% by weight of a polyurethane rubber chip chip having a particle size of 0.5 to 1.0 mm selected from waste materials, 10 to 70% by weight of loess powder having a particle size of 1.0 mm are mixed, a polyurethane resin solution is added thereto and mixed again to obtain a filling chip having a size of 0.8 mm to 2.0 mm. However, this method has a problem in that the compatibility between the inorganic yellow loess powder and the waste organic urethane chip is poor, and even if they are adhered with a polyurethane resin solution, they are easily broken down and become undifferentiated. In addition, there is a problem that it is difficult to express a color suitable for a grass field due to excessive use of loess.

On the other hand, Japanese Patent No. 869562 discloses a rubber chip treated with a vinegar solution and a biochip containing the rubber chip and the loess. In this method, the rubber chips must be treated with the vinegar for 24 hours or more, and the manufacturing process is complicated. Also, in the case of green loess, the green chip is susceptible to impact, heat or water, and the amount of loess used in 100 parts by weight of biochip exceeds 0.02 parts by weight There is a problem that the elasticity is deteriorated due to overcoating with yellow clay.

Recently, there has been a demand for a highly functional artificial turf filler such as antistatic property. There is also a need for measures to improve the problem that artificial turf fillers, which are rubber-based, stick to the body due to static electricity when they fall from artificial turf.

Although it is possible to manufacture chips by mixing an antistatic agent, there is a problem of cost increase due to use of an expensive antistatic agent. In addition, when used over a long period of time in a playground, the antistatic agent that has flowed to the surface is lost and the antistatic property is lowered.

Accordingly, there is a continuing demand for antistatic artificial turf fillers that can maintain cost competitiveness while providing antistatic properties to artificial turf fillers.

The problem to be solved by the present invention is to provide a method for manufacturing an antistatic artificial grass filling chip.

Another object to be solved by the present invention is to provide an antistatic artificial grass filling chip.

In order to solve the above problems, in the present invention, 0.5 to 1 part by weight of hydrophilic fiber and 0.5 to 1 part by weight of biodegradable fiber and binder mixture on the surface of the regenerated or new rubber chip, 100 parts by weight of rubber chip. It provides an antistatic artificial turf filler manufacturing method characterized in that to form a coating layer consisting of parts by weight.

According to an aspect of the present invention, a coating layer including 0.5 to 1 part by weight of hydrophilic fiber, 0.5 to 1 part by weight of biodegradable fiber, and 15-30 parts by weight of a binder mixture is provided on the surface of a regenerated or new rubber chip. It provides an antistatic artificial grass filling material, characterized in that formed.

Although not limited in theory, the hydrophilic fibers included in the coating layer provide a passage through which moisture on the surface is absorbed into the coating layer to prevent moisture from escaping, thereby improving antistatic properties, and the biodegradable fiber coating layer when used for a long time. As it decomposes and escapes in the air, it forms voids in the coating layer to improve moisture absorption and storage, and thus exhibits antistatic properties by using rain, snow, air, or earth moisture without adding an expensive antistatic agent. Will be.

In the present invention, the rubber chip may be a reclaimed rubber chip obtained by pulverizing a waste rubber, a petroleum resin or the like, or a new material elastic rubber chip such as polyurethane or EPDM. Since the physical properties of the waste tires are constant, they can be used in a uniform size regardless of the type. In the case of waste polyurethane, shredded polyurethane chips can be used in shoes, refrigerators, sheets and the like It is preferable that the various urethane used are selected by crushing and scrapped. In the case of new rubber chips, EPDM, polyurethane, etc. can be used and they can be purchased commercially.

In the practice of the present invention, it is preferable that the rubber chip is used without any additional surface treatment so as not to affect the elasticity of the rubber, such as the reclaimed rubber or the rubber. In the present invention, it is preferable that the rubber chip size is a synthetic grass filler having a diameter of about 1-10 mm, preferably about 2-5 mm, in consideration of strength, elasticity and tensile properties.

In the present invention, the hydrophilic fiber is a fiber having affinity with water, and is rayon, cotton, pulp and the like. In particular, rayon is suitably used because of its high affinity with water, the long fiber, easy molding into a predetermined shape as a liquid absorbent core, and excellent workability.

Examples of the water-absorbent fiber used in the present invention include water-absorbing synthetic fibers such as polyvinyl alcohol and sodium polyacrylate, and polyvinyl alcohol and sodium polyacrylate which are treated with other synthetic fibers by impregnation and coating . As a brand name, "Ransil" (Toyo Spinning Co., Ltd.) is mentioned.

In the practice of the present invention, the diameter of the hydrophilic fiber is preferably 200-500 micrometers, preferably 250-400 micrometers, and most preferably 300 micrometers. In addition, the length of the hydrophilic fiber is preferably 500 to 2500 micrometers, and the length of the hydrophilic fiber is preferably about 5 to 10 times.

In the present invention, the biodegradable fiber refers to a fibrous material made of a biodegradable material, for example polylactic acid is a biodegradable synthetic fiber made of lactic acid obtained from fermentation of potato and corn starch. (PLA)). In another embodiment of the present invention, the biodegradable fiber is a regenerated cellulose fiber, a non-toxic N-methyl-molineline-N-oxide (N-methyl-morpholine-), which is a new water-insoluble solvent for cellulose. N-Oxide (NMMO)) is a tencel (Tencel). Obtained by spinning a wood pulp solution dissolved in NMMO monohydrate into diluted water-soluble NMMO, the solvent being environmentally friendly because it is recovered completely. These fibers are called Tencel (Coutaulds), and Tencel decomposes completely after six weeks.

In the present invention, the biodegradable fibers are preferably fibers having a diameter of less than 100 micrometers, and preferably 50 to 80 micrometers. If the channel is formed too narrow, it is not easy to manufacture. If the channel is too wide, moisture may not stay due to the capillary phenomenon and may easily escape. The length of the biodegradable fiber is preferably 500 to 2500 micrometers, similar to the hydrophilic fiber.

In the present invention, the binder may be a urethane or an acrylic binder, and all of the aqueous or oil-based type may be used. The urethane may be a one-liquid type such as a moisture-curing type, Types are also possible.

In the present invention, the coating layer may further comprise a pigment for color control. The pigment may be an organic or inorganic pigment capable of developing green color so as to form a color coated chip such as green. The pigment may be used in an amount of preferably 0.1 to 1 part by weight, more preferably 0.2 to 0.5 part by weight based on 100 parts by weight of the rubber chip.

In the present invention, the coating layer may further include a zeolite to store the absorbed moisture. The zeolite is preferably a fired X-type zeolite, it is preferable to use particles of 0.1 to 10 microns in diameter. The zeolite is preferably used in a range of 0.1 to 1.0 part by weight based on 100 parts by weight of the rubber. The zeolite is contacted with the hydrophilic fiber in the coating layer to store moisture introduced through the hydrophilic fiber, And the moisture flowing through the micro-channel is stored.

In the present invention, a small amount of a compatibilizer may be used in the coating layer to increase the compatibility of the inorganic material such as zeolite to the binder, and preferably, the compatibility between a large amount of silica and the binder included in the zeolite may be improved. Preference is given to using silane compounds which can exhibit similar properties to silica. As the silane compound, compounds such as vinyl silane and mercaptosilane may be used, and they may be commercially purchased and used. For example, the silane compound may be selected from the group consisting of methyltrimethoxysilane (MTMS), 3-glycidoxypropyl trimethoxysilane (GPTMS), 3-methacryloxypropyltrimethoxysilane -methacryloxypropyl trimethoxysilane (MPTMS), and aminopropyl triethoxysilane. The silane compound may be used in an amount of 0.1-0.2 parts by weight based on 100 parts by weight of the rubber chip.

In the present invention, it is preferable that the coating layer is formed to have a thickness of 300-1000 micrometers, preferably 600-900 micrometers, so as to withstand the porous channel due to moisture absorption and decomposition of biodegradable fibers. If the thickness of the coating layer is excessively thin, water can not be sufficiently supported and vaporized, and the antistatic property is deteriorated.

The artificial turf filler according to the present invention is installed as a filling material of an artificial turf ground to provide a natural grass turf.

The artificial turf filler according to the present invention can contain moisture for a long time without using a separate antistatic agent such as a conductive polymer, thereby providing a new artificial turf filler having a predetermined antistatic effect. Further, the elongation is improved due to the mixing of the fibers, and the durability is improved.

Hereinafter, the present invention will be described in detail with reference to examples. The following examples are intended to illustrate the invention and in no case are to be construed as limiting the scope of the invention. The above embodiments are capable of various modifications and substitutions that may be commonly implemented by those skilled in the art.

Example 1

Manufacture of green antistatic artificial grass filler chip

50 micron diameter biodegradable fiber The biodegradable fiber component of Tencel cut to 1 mm length and 200 g and the hydrophilic fiber component cut to 2 mm length of 200 micron diameter hydrophilic fiber component are mixed with 20 kg of polyurethane binder. A coating solution was prepared.

100 kg of waste urethane chips having a particle diameter of about 2-3 mm were introduced into the cylindrical reactor, and the reactor temperature was raised to 60 ° C. while stirring. 500 g of the green pigment was mixed and then slowly added dropwise over 2 hours, heated to 80 ° C., and stirred for 5 hours. Thereafter, after gradually lowering the temperature, the temperature was maintained for 8 hours while stirring to prepare an antistatic artificial grass filler chip having a green appearance.

Example 2

The procedure of Example 1 was repeated except that the content of the polyurethane binder was increased to 30 kg.

Example 3

Except that 200 g of X type zeolite and 100 g of methyl trimethoxysilane were further added to the coating solution.

Example 4

Was prepared as in Example 3 except that biodegradable fiber Tencel of 80 micrometer diameter and rayon fiber of 300 micrometer diameter were used.

Comparative Example 1

It was prepared in the same manner as in Example 1 except that hydrophilic fibers and biodegradable fibers were not used.

Comparative Example 2

Instead of hydrophilic fibers and biodegradable fibers, 500 g of Hostastat HS1 from American Hoechst, an anionic antistatic agent, was added and coated.

Property measurement

100 parts by weight of the green artificial turf filler prepared in Examples 1 to 4 and Comparative Examples 1 and 2 and 30 kg of this liquid type polyurethane binder were mixed and placed in a thickness of 5 cm and pressed at a temperature of about 100 ° C to measure physical properties And the results are shown in Table 1. < tb > < TABLE >

Item Practice 1 Practice 2 Practice 3 Practice 4 Comparison 1 Comparison 2 Tensile Strength (Mpa) 0.65 0.64 0.69 0.68 0.65 0.66 Elongation (%) 94 96 92 90 65 66 Tensile Stress (MPa) 0.50 0.54 0.52 0.56 0.50 0.55 Hardness (HS) 43 43 50 53 45 42 Antistatic Good Good Good Good Bad Good Long term absorbency Good Good Good Good Bad decrease color green green green green green green

The antistatic property is obtained by drying the chip at 80 ° C. for 24 hours at a relative humidity of 0%, holding it at 25 ° C. in a 50% relative humidity environment for 10 hours, rubbing the dried ABS resin board 10 times in the cloth, After fixing, it is judged to be charged enough to the chip attached to the ABS board.

Good charging performance: Almost no sticking.

Poor antistatic property: more than 50% stick.

Decrease in chargeability: between good and bad

The long-term absorbability is measured after the chip is installed for 6 months, after the chip is dried at 80 ° C for 24 hours at 0% relative humidity, and maintained at 25 ° C for 50 hours in a relative humidity of 50% for 10 hours.

Color: Visually observe the appearance of the chip surface.

Claims (6)

0.5-1 weight part of hydrophilic fibers selected from the group consisting of rayon, cotton, pulp, polyvinyl alcohol, sodium polyacrylate, and polylactic acid or Method for producing an antistatic artificial grass filling material, characterized in that to form a coating layer consisting of 0.5 ~ 1 parts by weight of biodegradable fibers selected from TENCEL and 15-30 parts by weight of the binder. The method of claim 1, wherein the coating layer further comprises a pigment. The method of claim 2, wherein the coating layer further comprises a zeolite. The method of claim 3, wherein the coating layer further comprises a silane compound. The method of claim 1, wherein the hydrophilic fiber has a diameter of 200 to 500 micrometers and the biodegradable fiber has a diameter of 50 to 80 micrometers. An antistatic artificial grass filler prepared by the method according to any one of claims 1 to 5.