KR101469115B1 - Plastic material comprising thermoplastic urethane for electrostatic painting - Google Patents
Plastic material comprising thermoplastic urethane for electrostatic painting Download PDFInfo
- Publication number
- KR101469115B1 KR101469115B1 KR20130069075A KR20130069075A KR101469115B1 KR 101469115 B1 KR101469115 B1 KR 101469115B1 KR 20130069075 A KR20130069075 A KR 20130069075A KR 20130069075 A KR20130069075 A KR 20130069075A KR 101469115 B1 KR101469115 B1 KR 101469115B1
- Authority
- KR
- South Korea
- Prior art keywords
- plastic material
- nylon
- thermoplastic urethane
- weight
- parts
- Prior art date
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/44—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for electrophoretic applications
- C09D5/4419—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for electrophoretic applications with polymers obtained otherwise than by polymerisation reactions only involving carbon-to-carbon unsaturated bonds
- C09D5/4461—Polyamides; Polyimides
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/44—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for electrophoretic applications
- C09D5/4419—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for electrophoretic applications with polymers obtained otherwise than by polymerisation reactions only involving carbon-to-carbon unsaturated bonds
- C09D5/4465—Polyurethanes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/44—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for electrophoretic applications
- C09D5/448—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for electrophoretic applications characterised by the additives used
Abstract
Description
TECHNICAL FIELD The present invention relates to a plastic material for electrodeposition coating including a thermoplastic urethane, and more particularly, to a plastic material for electrodeposition coating which is particularly useful for electrodeposition coating because it has good mechanical properties and conductive properties while using nylon resin, .
This patent is the result of research carried out by the Small and Medium Business Administration's joint research and development project (No. 00045345).
In recent years, there have been issues such as lighter weight worldwide, implementation of various designs, and reduction of production costs by simplifying the production process. Accordingly, efforts have been made to fabricate structures of metal materials, which are heavy in weight and difficult to manufacture, from materials such as plastics.
For example, attempts have been made to replace electroplated materials such as automobile parts with plastics. Lightweight automotive materials are the best way to increase engine efficiency and ultimately improve fuel efficiency in automobiles. Moreover, due to serious environmental pollution and sudden increase in demand for automobiles, energy resources are already exhausted, and developed countries are already tightening regulations on automobile fuel consumption and exhaust gas. The development of new technologies for improving competitiveness in accordance with environmental regulations is highly desired in the automobile industry. Particularly, weight reduction of the material is the most suitable and effective method for prevention of environmental pollution and fuel saving because it can maximize the improvement of the performance of the automobile by raising the efficiency of the engine and thereby improving the fuel efficiency. Especially, the light weight technology using the polymer resin is typical. In the case of automobiles, many plastic products are already used for interior materials, and plastics are mainly used for exterior materials such as bumpers and door mirrors. In some cars, parts such as Fender are also being applied to plastic.
Electrostatic painting, which minimizes the use of organic solvents due to the improvement of efficiency and VOC regulation, is applied to exterior parts of automobiles. In the electrodeposition coating, high electric conductivity of the polymer resin is required, and it is necessary to lower the electric resistance value of the molded product of the polymer resin.
Electrodeposited plastic materials using nylon resin (nylon 66 resin) widely used as plastic materials have been developed. However, they are highly hygroscopic for water, swell when exposed to water for a long time to cause premature breakage, Coating process is inevitable and the use of compatibilizer causes cost increase. Therefore, the development of plastic material for electrodeposition coating which can be applied to plastic material for electrodeposition coating using nylon 66 resin is urgently required Is being requested.
Disclosure of the Invention The present invention has been made in order to solve the problems of the prior art as described above, and it is an object of the present invention to provide a nylon resin (nylon 66) which is widely used as a plastic material and has excellent mechanical properties and electrical properties, It is an object of the present invention to provide a plastic material for painting.
In order to solve the above problems,
Nylon resin blends;
Thermoplastic urethane (TPU); And
Carbon nanotubes (CNTs);
And a plastic material for electrodeposition coating.
The plastic material for electrodeposition coating according to the present invention can be effectively used as a plastic material for electrodeposition coating because it has superior mechanical and electrical properties while using a general nylon resin (nylon 66) .
Hereinafter, the present invention will be described in detail.
The plastic material for electrodeposition coating of the present invention may be a nylon resin blend; Thermoplastic urethane (TPU); And carbon nanotubes (CNTs). Each component will be described in detail below.
a) Nylon resin Blend
Conventional nylon 66 electrodeposition coating materials are highly hygroscopic and swell during prolonged exposure to water to cause premature breakage and discoloration at atmospheric conditions. Therefore, a protective coating process is inevitable and cost increases due to the use of compatibilizers. In the present invention, a nylon resin blend comprising nylon 6T and nylon 66 is used. nylon 6T has a low stiffness due to the steric hindrance of the aromatic ring, and water molecules are not easily coordinated, and the physical properties can be improved without using compatibilizer between nylon 66 and nylon 6T resin. In addition, nylon 6T is resistant to stress cracking by metal salts (zinc chloride, calcium chloride) and has excellent chemical resistance to acids, alkalis and organic solvents. In the present invention, the nylon resin blend is preferably blended with 50 to 95 parts by weight of nylon 66 and 50 to 5 parts by weight of nylon 6T. In this case, the mechanical properties and electrical properties of the plastic material for electrodeposition coating can be improved at the same time.
b) Thermoplastic urethane ( TPU )
The plastic material for electrodeposition coating of the present invention includes thermoplastic urethane (TPU). Preferably, the thermoplastic urethane is an ester type. In this case, the electrical characteristics of the electroplated plastic material can be further improved. In the plastic material for electrodeposition coating of the present invention, the thermoplastic urethane is preferably contained in an amount of 10 to 30 parts by weight, more preferably 12 to 17 parts by weight, based on 100 parts by weight of the nylon resin blend. Within the above range, the mechanical properties and the electrical properties of the plastic material for electrodeposition coating can be improved at the same time.
c) Carbon nanobube
The plastic material for electrodeposition coating of the present invention includes carbon nanotubes. Preferably, the carbon nanotube is a multi-walled carbon nanotube (MWCNT). In this case, the weatherability and electrical characteristics of the electroplated plastic material can be further improved. In the plastic material for electrodeposition coating of the present invention, the carbon nanotubes are preferably contained in an amount of 0.5 to 5 parts by weight, more preferably 1 to 3 parts by weight, based on 100 parts by weight of the nylon resin blend. Within the above range, the mechanical properties and the electrical properties of the plastic material for electrodeposition coating can be improved at the same time.
In the present invention, the plastic material for electrodeposition painting can be prepared by uniformly mixing and extruding the nylon resin blend, the thermoplastic urethane (TPU), and the carbon nanotube (CNT). For example, the respective components of the nylon resin blend, the thermoplastic urethane (TPU), and the carbon nanotube (CNT) were dried and crushed, and then 100 parts by weight of the nylon resin blend; 10 to 30 parts by weight of a thermoplastic urethane (TPU); And carbon nanotubes (CNT) in an amount of 0.5 to 5 parts by weight, and can be molded into a desired shape using a compression molding machine. The drying, crushing and compression molding may be carried out by known processes used for processing plastic materials for electrodeposition coating. For example, drying nylon resin is dried at 100 ° C for 24 hours, and thermoplastic urethane is dried at 80 ° C for 24 hours , And then dried at 80 ° C for 24 hours using a carbon nano-batt vacuum dryer. Then, the composite material was extruded using a twin screw extruder under the conditions of a screw speed of 100 rpm and a feeder speed of 150 rpm, A sample can be crushed and molded using an injection molder and a compression molding machine.
The plastic material for electrodeposition coating according to the present invention is excellent in mechanical properties such as tensile strength, tensile elastic modulus, flexural strength, flexural modulus and impact strength, and electrical characteristics including surface resistance while using nylon resin widely used And the surface resistivity (Ω / sq) of 1.0E + 07 to 1.0E + 09, which are excellent in impact strength (Izod impact strength (kgf-cm / cm 2 ) It is useful as a plastic material for electrodeposition painting and can contribute to the reduction of vehicle weight and the like.
Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the scope of the present invention is not limited to the following examples.
Examples 1 and 2 and Comparative Examples 1 to 4
A plastic material for electrodeposition coating was prepared according to the composition ratio shown in Table 1 below. In Table 1, the component contents are in weight ratio, the ester type urethane is used for the thermoplastic urethane, and the MWCNT is used for the carbon nanotube.
The mechanical properties and the electrical characteristics of the plastic material for electrodeposition coating thus prepared are specified in Table 1 below. The experimental method is as follows.
1) Tensile strength and tensile modulus
A dog-born type specimen was used in a universal testing machine (UTM). Specimen thickness was 3.0 mm, gauge length was 10 mm, and main speed was 50 mm / min.
2) Flexural strength and flexural modulus
In the UTM, rectangular type specimens were used. Specimen width was 12.0 mm, specimen thickness was 3.0 mm, and main speed was 2.8 mm / min.
3) Impact strength
The rectangular type specimens of the same size as the flexural strength measurements were measured for impact strength by 0.68 kg using an impact resistance tester.
4) Surface resistance
A sample of about 0.4 mm thin film was placed in a resistivity chamber using a hot press and the surface resistance was measured with an ultra high resistance meter.
(kgf-cm / cm 2 )
(Ω / sq)
As shown in Table 1, the electrodeposited plastic material according to the present invention has a high hygroscopicity of water, which is a problem of nylon 66, which is a conventional nylon resin, and expands upon prolonged exposure to water to cause premature breakage. It is confirmed that the problem is solved by blending nylon 6T and further improving mechanical properties such as impact strength and surface resistance and electrical characteristics.
Claims (6)
10 to 30 parts by weight of a thermoplastic urethane (TPU); And
0.5 to 5 parts by weight of carbon nanotubes (CNT);
And a plastic material for electrodeposition coating.
Wherein the thermoplastic urethane (TPU) is an ester-type thermoplastic urethane (TPU).
Wherein the carbon nanotube is a multi-walled carbon nanotube (MWCNT).
The plastic material for electrodeposition coating has an impact strength (Izod impact strength (kgf-cm / cm 2 )) of 8.0 to 13 and a surface resistivity (Ω / sq) of 1.0E + 07 to 1.0E + 09 Features plastic material for electroplating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR20130069075A KR101469115B1 (en) | 2013-06-17 | 2013-06-17 | Plastic material comprising thermoplastic urethane for electrostatic painting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR20130069075A KR101469115B1 (en) | 2013-06-17 | 2013-06-17 | Plastic material comprising thermoplastic urethane for electrostatic painting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR101469115B1 true KR101469115B1 (en) | 2014-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR20130069075A KR101469115B1 (en) | 2013-06-17 | 2013-06-17 | Plastic material comprising thermoplastic urethane for electrostatic painting |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018133294A1 (en) * | 2017-01-20 | 2018-07-26 | 金发科技股份有限公司 | Semi-aromatic polyamide resin, method for preparing same, and polyamide molding composition consisting of same |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006286202A (en) | 2001-03-06 | 2006-10-19 | Toray Ind Inc | High conductive resin molded component and its manufacturing method |
| JP2010006663A (en) | 2008-06-27 | 2010-01-14 | Toray Ind Inc | Carbon nanotube assembly, method for producing the same, shaped body, composition and composite |
| JP2011032320A (en) | 2009-07-30 | 2011-02-17 | Toyobo Co Ltd | Polyamide-based conductive resin composition |
| KR20110115954A (en) * | 2011-02-24 | 2011-10-24 | (주)월드튜브 | Nanocarbon liquid composition, nanocarbon resin composion, nanocarbon molded body, nanocarbon resin body and manufacturing method of the sames |
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2013
- 2013-06-17 KR KR20130069075A patent/KR101469115B1/en active IP Right Grant
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006286202A (en) | 2001-03-06 | 2006-10-19 | Toray Ind Inc | High conductive resin molded component and its manufacturing method |
| JP2010006663A (en) | 2008-06-27 | 2010-01-14 | Toray Ind Inc | Carbon nanotube assembly, method for producing the same, shaped body, composition and composite |
| JP2011032320A (en) | 2009-07-30 | 2011-02-17 | Toyobo Co Ltd | Polyamide-based conductive resin composition |
| KR20110115954A (en) * | 2011-02-24 | 2011-10-24 | (주)월드튜브 | Nanocarbon liquid composition, nanocarbon resin composion, nanocarbon molded body, nanocarbon resin body and manufacturing method of the sames |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018133294A1 (en) * | 2017-01-20 | 2018-07-26 | 金发科技股份有限公司 | Semi-aromatic polyamide resin, method for preparing same, and polyamide molding composition consisting of same |
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