KR101650143B1 - Antistatic compositions for coating pipe - Google Patents

Abstract

The present invention relates to an antistatic pipe coating composition, which comprises a polypropylene resin-based pipe coating composition comprising as a pigment a mixture of mica and iron oxide or solvent naphtha, aluminum and stearic acid as a mixture, and N , N'-ethylenedistearamide and zinc stearic acid. The pipe coating composition according to the present invention has advantages of being excellent in antistatic property and conductivity by using gold or silver pearl, which can shield the generation of static electricity . Accordingly, the pipe coating composition according to the present invention is expected to be usefully used in antistatic coatings for indoor and outdoor metal pipes.

Description

[0001] Antistatic compositions for coating pipes [0002]

The present invention relates to an antistatic pipe coating composition, and more particularly, to a coating composition comprising a polypropylene resin as a base, The present invention relates to an improved antistatic pipe coating composition containing pearl.

Outdoor and indoor metal pipes are used for most railings, cargo holders, and structural aids. However, uncoated metal pipes are easily rusted by surface oxidation and require periodic painting. In this case, the simple paint operation only causes dryness in the winter, which causes the static touch to occur, which causes the body to feel too cold, which causes the object to be in contact with the object. If water or oil is on the surface of the pipe, .

In the coating method for the metal pipe, it is possible to prevent the oxidation of the surface or give a soft feeling when the human body touches by simple coating of the resin. However, the possibility of being exposed to ultraviolet rays, the environmental pollution such as oil adhered by human hands or work gloves And cracks due to cracks, and safety problems due to sliding may occur.

In addition, as the interest in living environment increases, the demand for high-grade metal pipes is increased, so that the coating resin of metal pipe is not only excellent in corrosion resistance but also excellent in weather resistance, chemical resistance, antistatic performance, proper surface roughness, A smooth sensation, a beautiful appearance, and an easy extrusion processability are required.

Generally, polyethylene or polystyrene resin is used for coating the metal pipe. The polyethylene resin is excellent in impact resistance, workability, or insulation, and the polystyrene resin has an advantage of being excellent in durability. However, such a resin is disadvantageous in that it is poor in water repellency or antibacterial property.

Therefore, many researches have been conducted in the field to improve water repellency and antibacterial property. For example, Korea Patent Publication No. 2008-0105313 has proposed a pipe coating thermosetting powder coating composition. The prior art is a thermosetting epoxy resin composition comprising 20 to 60% by weight of a bisphenol A type epoxy resin, 1 to 30% by weight of a novolak modified bisphenol A type epoxy resin or a urethane modified bisphenol A type epoxy resin, 5 to 15% Based coating composition comprising 0.1 to 2% by weight of an amine-based promoting latent curing agent, 0.5 to 1% by weight of a curing accelerator, 10 to 20% by weight of a phosphate-based pigment, and 5 to 30% by weight of a pigment other than a phosphate- .

Korean Patent Publication No. 2011-0110090 " Pipe coating method and composition " The prior art includes a flexible tubular polymeric substrate; And a coating disposed on an outer surface of the tubular substrate, wherein the substrate has an outer diameter of at least 5/16 inches and a burst strength of at least 475 psi at 23 DEG C, A flexible tubular member comprising at least one radiation cured crosslinkable polymeric layer having a thickness. It is disclosed in the prior art that the polymeric substrate is a polyolefin and the polyolefin is a polyethylene.

On the other hand, most of the electrostatic disturbance and disaster are caused by the spark discharge resulting from the charging of the conductor. Therefore, in order to prevent electrification of the conductor, the conductor and the ground are electrically connected to each other to make the ground and the equipotential. Should be. Such a charge control agent imparts hygroscopicity and ionicity to the surfaces of fibers and resins to increase conductivity, thereby preventing electrification. Surfactants are mainly used as antistatic agents. Since the effect of such an antistatic agent changes depending on the ambient humidity, it is necessary to maintain the relative humidity at 50% or more and regularly check the antistatic effect. Covering the surface of a charged object with a metal or a conductive material is referred to as shielding.

Such electrostatic shielding effect can be exemplified by an antistatic effect by suppressing the electrical action, an effect of suppressing the potential rise of the electrified object, a suppression of the dynamic phenomenon by the electrified electrostatic electrified, and a discharge suppressing effect. As the shielding material, a metal or a conductive tape, Or a material containing a metal wire or a conductive fiber may be used.

Accordingly, the inventors of the present invention have been conducting research to develop a pipe coating composition having improved antistatic property and conductivity capable of shielding the generation of static electricity. In the pipe coating composition based on a polypropylene resin, gold or silver the present inventors have completed the present invention by discovering that antistatic properties and conductivity can be improved by using silver pearl as a pigment.

Accordingly, an object of the present invention is to provide a pipe coating composition having improved antistatic properties.

In order to solve the above technical problems, the present invention provides a pipe coating composition based on a polypropylene resin, which comprises a mixture of mica and iron oxide as pigments, N, N'-ethylene diesteramide and Zinc stearate. ≪ / RTI >

The present invention also provides a pipe coating composition based on a polypropylene resin, which comprises a mixture of solvent naphtha, aluminum and stearic acid as pigments, and contains N, N'-ethylenedistearamide and zinc stearate as additives And a pipe coating composition.

Preferably, according to a specific embodiment of the present invention, the pipe coating composition according to the present invention is characterized by a specific gravity and a melt index (MI) of 0.9 to 1.0 g / cc and 2.3 to 3.3 g / 10 min, respectively.

As described above, the pipe coating composition according to the present invention has an advantage of being able to shield the generation of static electricity because of its excellent antistatic property and conductivity by using gold or silver pearl. Accordingly, the pipe coating composition according to the present invention is expected to be usefully used in antistatic coatings for indoor and outdoor metal pipes.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments of the invention and, together with the description of the invention, It should not be construed as limited.
1 is a photograph of a pipe coated with a pipe coating composition according to the present invention.
Figure 2 shows an embodiment of an apparatus for coating with a coating composition according to the invention.

The pipe coating composition according to the present invention is a pipe coating composition having antistatic property and conductivity improved by the addition of gold or silver pearl to control the generation of static electricity. In a pipe coating composition based on polypropylene, A mixture of iron oxides, wherein the additive comprises N, N'-ethylene diesteramide and zinc stearic acid;

Or polypropylene, characterized in that it comprises a mixture of solvent naphtha, aluminum and stearic acid as pigments, and comprises N, N'-ethylene distearamide and zinc stearic acid as additives, To provide a pipe coating composition containing pearl.

The pipe coating composition according to the present invention is characterized by a specific gravity and a melt index (MI) of 0.9 to 1.0 g / cc and 2.3 to 3.3 g / 10 min, respectively.

The polypropylene-based resin used in the present invention is remarkably high in softening temperature and excellent in tensile strength, bending strength and rigidity as compared with a high-density polyethylene-based resin, and is small in transparency, surface gloss and molding shrinkage of a molded product, have.

The mica used as a pigment in the pipe coating composition of the present invention is also referred to as mica, and has a layered structure, usually in the form of a hexagonal plate-like crystal, and has a yellowish, brownish green color. Because muscovite is strong in fire resistance and is an electric insulator, it is used for electric insulation, refractory material, especially window of fireplace, etc., and powder is used as gold silver mud because it is bright white. Gold mica is also used as good quality biotite, but biotite is less valuable because it has a lot of iron. Hong Min-mo ㅇ Jin-divalite contains lithium, so it is used as ore.

The iron oxide used as the pigment in the pipe coating composition of the present invention is a compound of iron and oxygen, including iron oxide (II), iron oxide (III), and iron (III) oxide. (Ⅱ), iron oxide (Ⅲ), iron (III), and iron (III) sulphate, which can be obtained by reduction, heating, and combustion.

Iron oxide (II) (ferrous oxide, FeO) is also referred to as iron monoxide or iron dioxide. Iron oxide (III) is reduced by hydrogen, or by blocking air and heating iron oxalate, but it is difficult to obtain pure. When heated in air, it becomes iron oxide (III). Made at low temperatures, it is rich in reactivity and has strong magnetic properties. It is reduced by hydrogen to produce iron.

Iron oxide (III) (ferric oxide, Fe2O3) is also referred to as ferric trioxide or ferric oxide. It is widely produced as hematite (red stone) in nature and is a factor of the color of red soil. Reddish brown powder having a specific gravity of 4.5 to 5.2, a melting point of 1,550 ° C, and an oil absorption amount (oil absorption amount) of 22 to 75%. It is fairly stable against sunlight, air, moisture, heat, etc. Once heated, it does not melt well and shows magnetism. Depending on the preparation method, there are yellow, brown, purple, black and the like from red to yellow. The reasons for different colors include particle size, kind of inclusion, and completeness of crystal lattice. It is industrially used as red pigment (pigment) called Bengala and also used as an abrasive material of glass, precious metal and diamond. High purity is used as a semiconductor, and also as a raw material for magnets and magnetic tapes.

In addition, iron (III) oxide (Fe3O4) is produced as a black heavy powder, and as a natural magnetite. It is produced by burning iron wire in the air or by contacting steam with hot iron.

When the mica and iron oxide are mixed and used as pigments in a pipe coating composition, a pipe coating composition containing gold pearl improved in antistatic property and conductivity can be produced.

It is preferable to use the mixture of mica and iron oxide in an amount of 20 to 50 parts by weight based on 100 parts by weight of the polypropylene resin. If it is used in an amount less than 20 parts by weight, it is difficult to obtain an effect of improving antistatic property and conductivity. If it exceeds 50 parts by weight, antistatic property and conductivity are not increased in proportion to the amount of use. The mica and iron oxide are preferably used in a weight ratio of 1: 2 to 2: 1.

Solvent naphtha used as pigments in the pipe coating compositions of the present invention is colorless and transparent and is similar to gasoline and has a boiling point of 120-200 ° C. Benzene-based hydrocarbons are mainly used for coal-based gas diesel or tar diesel fuel, and petroleum gasoline for raw materials is composed of paraffinic and naphthenic hydrocarbons, and is used as a relatively heavy solvent.

Aluminum used as pigments in the pipe coating composition of the present invention is a metal element belonging to the period of Group 3 in Periodic Table 13 and has an elemental symbol of Al, an atomic weight of 26.981 g / mol, a melting point of 660.32 캜, a boiling point of 2519 캜, a density of 2.7 g / cm < ^{3 &} gt ;. It is a silvery, white, light metal and is one of the main constituents of the earth's crust. It is widely used as raw materials and materials by using light and durable characteristics.

Stearic acid used as a pigment in the pipe coating composition of the present invention is a saturated fatty acid having 18 carbon atoms and is most commonly detected together with palmitic acid as a natural saturated fatty acid and is a natural fat, Fat), hair follicles (hair fat), and cacao. Among the total constituent fatty acids, 34% in cacao, 7% in soybean oil, and 4.6% in sesame oil. It dissolves in ether, hexane, chloroform and ethanol. It is insoluble in benzene and disulfide carbon. It is used for manufacturing candles, suppositories, ointments and the like. It is made from palmitoyl CoA by an endoplasmic reticulum or mitochondrial enzyme.

When the solvent naphtha, aluminum and stearic acid are mixed and used as a pigment in a pipe coating composition, a pipe coating composition having silver pearl improved antistatic property and conductivity can be prepared.

It is preferable to use a mixture of the solvent naphtha, aluminum and stearic acid in an amount of 20 to 50 parts by weight based on 100 parts by weight of the polypropylene resin. If it is used in an amount less than 20 parts by weight, it is difficult to obtain an effect of improving antistatic property and conductivity. If it exceeds 50 parts by weight, antistatic property and conductivity are not increased in proportion to the amount of use. The solvent naphtha, aluminum and stearic acid are preferably used in a weight ratio of 1: 2: 2 to 2: 1: 2.

The pipe coating composition according to the present invention can be made in the form of a master batch or solid pellet and can be coated on a pipe by a suitable coating apparatus. For example, 1.0 to 1.1 T in thickness on a metal pipe.

1 is a photograph of a pipe coated with a pipe coating composition according to the present invention.

According to one specific embodiment of the present invention, the master batch of the pipe coating composition with gold pearl according to the present invention has a specific gravity and a melt index (MI) of 1.10 to 1.40 g / cc and 90 to 93 g / 10 min .

According to one specific embodiment of the present invention, the masterbatch of the pipe coating composition with silver pearls according to the invention has a specific gravity and a melt index (MI) of 0.90 to 1.10 g / cc and 30 to 32 g / 10 min .

The additives used in the present invention are N, N'-ethylene diesteramide and zinc stearic acid, which are used to improve the physical properties of the pipe coating composition of the present invention, and are used in an amount of 10 to 20 parts by weight per 100 parts by weight of the polypropylene resin It can be used as an amount.

The pipe coating composition of the present invention may further include additional additives to improve physical properties. But are not limited to, for example, additives such as flame retardants, flame retardants, anti-dripping agents, antioxidants, plasticizers, weather stabilizers, pigments, dyes, colorants, inorganic additives and / or mixtures thereof.

The antistatic property of the pipe coating composition according to the present invention can be measured by a half-life method and a surface resistance measurement method. The half-life technique measures the time for which the charge amount is reduced by half after giving a constant charge to the resin molded article, and it is possible to grasp the characteristics of the chargeability although there is no specific range. In the present invention uses a surface resistance measuring method, a surface resistance measuring method of surface resistance of the common non-antistatic resin molded article by measuring the surface resistance of the resin molded article itself, is ⁸ to 10 10 ¹⁰ Ω, and this surface resistance indicates the time when electricity flows out. When the resistance is 10 times, the required time is also 10 times.

The pipe coating composition according to the present invention has a surface resistance measured according to ASTM D257 of from 10 < ⁸ > 10 < / ^RTI >

Figure 2 shows an embodiment of an apparatus for coating with a coating composition according to the invention. 2, the coating apparatus comprises a coating unit 11, a supply conduit 12 to the coating unit 11, a dispensing unit 13 for decomposing the coating composition into each supply conduit 12, 14).

The metal pipe P to be coated can be passed through the coating unit 11 by the conveying conveyor. The coating composition stored in the supply tank 14 can be pre-melted and supplied to the coating unit 11 via the distribution unit 13 and the supply conduit 12. [ If necessary, the metal pipe can be surface-modified.

A coating apparatus for any pipe coating can be applied to the apparatus according to the present invention and the present invention is not limited to the embodiments shown.

The pipe coating composition according to the present invention may be added with various additives as needed, and the present invention is not limited to the embodiments shown.

As described above, the pipe coating composition according to the present invention has an advantage of being able to shield the generation of static electricity because of its excellent antistatic property and conductivity by using gold or silver pearl. Accordingly, the pipe coating composition according to the present invention is expected to be usefully used in antistatic coatings for indoor and outdoor metal pipes.

Hereinafter, embodiments of the present invention will be described in detail to facilitate understanding of the present invention. However, the embodiments according to the present invention can be modified into various other forms, and the scope of the present invention should not be construed as being limited to the following embodiments. Embodiments of the invention are provided to more fully describe the present invention to those skilled in the art.

Example 1 Preparation of Pipe Coating Composition Containing Gold Pearl

A mixture obtained by mixing mica and iron oxide in a weight ratio of 1: 1 with respect to 100 parts by weight of a polypropylene resin in an amount of 40 parts by weight was mixed with 12 parts by weight of N, N'-ethylene distearamide and zinc stearic acid To prepare a pipe coating composition having gold pearl.

The master batch prepared by extrusion coating method was applied to the surface of the metal pipe and coated at a thickness of 1.1 T.

The specific gravity of the coating composition master batch was 1.30 g / cc and the melt index was 90.6 g / 10 min.

Example 2 Preparation of Pipe Coating Composition Containing Silver Pearl

40 parts by weight of a mixture of solvent naphtha, aluminum and stearic acid in a weight ratio of 1: 1: 1 with respect to 100 parts by weight of polypropylene resin was mixed, and N, N'-ethylenedistearamide and zinc stearic acid were dissolved in 12 By weight to prepare a pipe coating composition doped with gold pearl.

The master batch prepared by extrusion coating method was applied to the surface of the metal pipe and coated at a thickness of 1.1 T.

The specific gravity of the coating composition was 0.98 g / cc and the melt index was 31.0 g / 10 min.

≪ Comparative Example 1 &

Mica, iron oxide, solvent naphtha, aluminum and stearic acid was not used in the same manner as in Example 1. The pipe coating composition was prepared in the same manner as in Example 1, except that pigments such as mica, iron oxide, solvent naphtha, aluminum and stearic acid were not used.

The master batch prepared by extrusion coating method was applied to the surface of the metal pipe and coated at a thickness of 1.1 T.

The specific gravity of the coating composition was 0.89 g / cc and the melt index was 2.30 g / 10 min.

≪ Test Example 1 >

The yield point stress, elongation at break, flexural modulus, impact strength and thermal deformation temperature of the coated surface of the metal pipe were tested.

The yield point stress, the elongation at break, the flexural modulus, the impact strength, and the heat distortion temperature were respectively tested in accordance with ASTM D638, ASTM D638, ASTM D790, ASTM D256 and ASTM D648, respectively.

As can be seen from Table 1, the pipe coating composition according to the present invention maintains excellent impact resistance, fluidity and heat resistance, exhibits excellent appearance and coloring property, and exhibits excellent antistatic property.

As described above, the pipe coating composition according to the present invention has an advantage of being able to shield the generation of static electricity because of its excellent antistatic property and conductivity by using gold or silver pearl. Accordingly, the pipe coating composition according to the present invention is expected to be usefully used in antistatic coatings for indoor and outdoor metal pipes.

11: coating unit 12: supply conduit
13: Distribution unit 14: Supply tank

Claims (4)

1. A pipe coating composition comprising a polypropylene resin as a base and comprising a mixture of mica and iron oxide as pigments and N, N'-ethylenedisostearamide and zinc stearic acid as additives,
Wherein the pipe coating composition has a specific gravity and a melt index (MI) of 0.9 to 1.0 g / cc and 2.3 to 3.3 g / 10 min, respectively.
1. A pipe coating composition comprising a polypropylene resin as a base and comprising as a pigment a mixture of aluminum and stearic acid and comprising N, N'-ethylene diesteramide and zinc stearic acid as additives,
Further comprising solvent naphtha as the pigment, wherein the pipe coating composition has a specific gravity and a melt index (MI) of 0.9 to 1.0 g / cc and 2.3 to 3.3 g / 10 min, respectively.
3. The method according to claim 1 or 2,
Wherein the pigment is added in an amount of 20 to 50 parts by weight based on 100 parts by weight of the polypropylene resin. delete

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