KR101583190B1 - The manufacturing method of high durability anti-corrosive coating composition for the inside of coated steel pipe for water works - Google Patents
The manufacturing method of high durability anti-corrosive coating composition for the inside of coated steel pipe for water works Download PDFInfo
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- C09D7/14—
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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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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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
- C09D5/08—Anti-corrosive paints
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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
- C09D5/08—Anti-corrosive paints
- C09D5/082—Anti-corrosive paints characterised by the anti-corrosive pigment
- C09D5/084—Inorganic compounds
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Abstract
The present invention relates to a method for manufacturing a high durability anticorrosive coating composition containing an inner surface of a coated long steel pipe for water use. In the present invention, an anticorrosive paint containing no organic solvent, a conventional paint using a special epoxy resin having a high viscosity and high durability Lt; / RTI >
A method of manufacturing a high durability anticorrosive coating composition according to the present invention, which comprises the inner surface of a coated long steel pipe for water use,
(1) Preparation of base part Step 1: 10 to 40 parts by weight of a modified bisphenol F type epoxy resin, a phenol novolak type epoxy resin and a modified bisphenol A type rubber epoxy resin, as a reactive diluent, 1 to 20 parts by weight of at least one of a glycidyl amine compound and a polyfunctional glycidyl ether compound, 0 to 3 parts by weight of a silane coupling agent, and 0.5 to 5 parts by weight of an anti-settling agent are dispersed in a dispersion vessel at 600 to 900 rpm Mixing and stirring for 10 to 30 minutes,
(2) Preparation of Base Part 2 Step 2: In the agitated material stirred in the first step, 1 to 20 parts by weight of titanium oxide as a color pigment, 0 to 20 parts by weight of extender pigment, 0 to 10 parts by weight Adding an anticorrosive pigment and dispersing it at a particle size of 60 microns or less by wetting with stirring at 1200-1500 rpm for 20-30 minutes,
(3) Preparation of Base Part Step 3: 0.1 to 5 parts by weight of castor oil derivative as an anti-sag agent was added to the agitated product dispersed in the second step and stirred at 1500 to 1900 rpm to obtain 55 The temperature was raised to -65 DEG C, and then gradually cooled to 40 DEG C with stirring at 600 to 900 rpm to prepare a base portion,
(4) Hardener Step 4: 5 to 15 parts by weight of a curing agent and 0.5 to 2 parts by weight of a curing accelerator are mixed and stirred at 600 to 900 rpm for 10 to 20 minutes. Subsequently, Followed by stirring at 1500 to 1900 rpm for 20 to 30 minutes to prepare a hardener part.
Description
The present invention relates to a method for manufacturing a high durability anticorrosive coating composition containing an inner surface of a coated long steel pipe for water use. In the present invention, an anticorrosive paint containing no organic solvent, a conventional paint using a special epoxy resin having a high viscosity and high durability ≪ / RTI >
The most commonly used method for the water pipe is the method by the coating method. The present invention relates to an internal coating material of a steel pipe. In addition to the corrosion prevention function for its use, it should be sanitary to the human body and fluid flow smoothly.
There are various kinds of coating materials used for corrosion prevention of water pipes for steel pipes, and it may have a great influence on the long-term effect and the like depending on the selection and use methods of the kinds. Particularly, due to industrialization, corrosion environment factors such as acidified soils are increasing, and corrosion of underground materials is rapidly promoted due to air pollution and urbanization. In addition, most of the water and sewage pipe structures buried underground have enormous facility costs and have a great impact on national health and national economy. Therefore, these facilities should be able to exercise their functions for a long time. In other words, the use of nonwoven materials is robust and long-term durability such as semi-permanent method, sanitary safety, flexural resistance, impact resistance, long-term high temperature water resistance, chemical resistance, There should be little damage or distortion.
Development of paint suitable for the performance of the coating material has been proceeding with respect to the epoxy resin used in the conventional steel pipe due to the evaluation of the coating state and the prediction of the remaining life depending on the characteristics of the aged water and the buried environment. The present invention provides a method for producing a conventional paint using an environmentally friendly solvent-free low-viscosity, high-durability special epoxy resin that does not contain an organic solvent by selecting a paint suitable for setting up a domestic water supply system.
The anticorrosive coating composition of the present invention comprises a base portion and a hardener portion.
A method of manufacturing a high durability anticorrosive coating composition according to the present invention, which comprises the inner surface of a coated long steel pipe for water use,
(1) Preparation of base part Step 1: 10 to 40 parts by weight of a modified bisphenol F type epoxy resin, a phenol novolak type epoxy resin and a modified bisphenol A type rubber epoxy resin, as a reactive diluent, 1 to 20 parts by weight of at least one of a glycidyl amine compound and a polyfunctional glycidyl ether compound, 0 to 3 parts by weight of a silane coupling agent, and 0.5 to 5 parts by weight of an anti-settling agent are dispersed in a dispersion vessel at 600 to 900 rpm Mixing and stirring for 10 to 30 minutes,
(2) Preparation of Base Part 2 Step 2: In the agitated material stirred in the first step, 1 to 20 parts by weight of titanium oxide as a color pigment, 0 to 20 parts by weight of extender pigment, 0 to 10 parts by weight Adding an anticorrosive pigment and dispersing it at a particle size of 60 microns or less by wetting with stirring at 1200-1500 rpm for 20-30 minutes,
(3) Preparation of Base Part Step 3: 0.1 to 5 parts by weight of castor oil derivative as an anti-sag agent was added to the agitated product dispersed in the second step and stirred at 1500 to 1900 rpm to obtain 55 The temperature was raised to -65 DEG C, and then gradually cooled to 40 DEG C with stirring at 600 to 900 rpm to prepare a base portion,
(4) Hardener Step 4: 5 to 15 parts by weight of a curing agent and 0.5 to 2 parts by weight of a curing accelerator are mixed and stirred at 600 to 900 rpm for 10 to 20 minutes. Subsequently, Followed by stirring at 1500 to 1900 rpm for 20 to 30 minutes to prepare a hardener part.
In the second step, more than 0 to 10 parts by weight of ceramics may be added in addition to titanium oxide, extender pigments and rust preventive pigments.
The ceramic of the second step is an aluminum silicate based ceramic.
At this time, the amount of the epoxy resin added in the first step is 165 to 250,
The dosage ratio of the modified bisphenol F type epoxy resin, the phenol novolak type epoxy resin and the modified bisphenol A type rubber epoxy resin is 3: 1.5 to 2.5: 0.5 to 1.5.
The epoxy resin mixture to reactive diluent injected in the first step is in a weight ratio of 1: 0.2 to 0.5.
The silane-based coupling agent in the first step is at least one of a 3-glycidoxypropyltrimethoxysilane-based compound and a methacryloxypropyltrimethoxysilane-based compound.
Further, the extender pigments in the second and fourth steps are at least one of talc, mica, silica, barium sulfate and kaolin.
The rust-preventive pigment of the second step is at least one of aluminum dihydrogen triphosphate, zinc phosphate, zinc molybdate, zinc aluminum tripolyphosphate, and aluminum phosphate.
The curing agent in the fourth step is a modified polyamine.
The above contents will be further explained.
The first to third steps are steps for manufacturing a base part, and the fourth step is for manufacturing a hardener part. Therefore, in the present invention including claims, the first to third steps are connected to each other in a time series, and the structure in the fourth step has a time series meaning, but there is no such relationship between the first to third steps and the fourth step. That is, the first to third steps should be carried out first, the fourth step is not necessarily carried out first, and vice versa.
First, it is the first step.
Here, the epoxy resin refers to a binder, and an epoxy resin having at least two epoxy groups in one molecule and having an epoxy equivalent of 165 to 250 is used alone or in combination. It is preferable to use a mixture of a modified bisphenol A type rubber epoxy resin. When such an epoxy resin is used as a binder, the final product of the present invention can have a long-lasting durability when applied as a high-durability type coating material.
The epoxy resin is added in an amount of 10-40 parts by weight. When the amount of the epoxy resin is 40 parts by weight or more, the content of the pigment and the additive is relatively small, so that the viscosity is low and it is difficult to adjust the flowability and durability of the paint. Poor mixing property and fluidity of the coating material are so low that the coating workability is poor and the adhesive force is weak. Therefore, it is preferable to use a mixture of an epoxy resin having a low viscosity (equivalent to 165 to 250) and a reactive epoxy diluent (reactive diluent) to facilitate control of the viscosity of the coating material, and to improve the performance of each season with high adhesion and high durability.
The silane-based coupling plays an important role in allowing components of each epoxy resin to be mixed together to be easily mixed and maximize the performance of the adhesive strength in a proper distribution. In the present invention, the content is preferably 0 to 3 parts by weight.
The anti-settling agent is added to maintain the settleability of the pigment during long-term storage of the paint, and it plays a role of facilitating mixing with each component and maintaining the proper state. The content of the anti-settling agent in the present invention is preferably 0.5-5 parts by weight.
The second step is supplementary.
In the second step, titanium oxide, ceramics, extender pigment, and anti-corrosive pigment are added to the agitated material through the first step, and then the mixture is stirred and wetted and dispersed at a particle size of 60 microns or less. Titanium oxide is used as a color pigment, and ceramics, extender pigments, and anticorrosive pigments are administered.
In the third step, 0.1 to 5 parts by weight of a castor oil derivative (anti-sag agent) is added to the stirred mixture dispersed in the step 2, and the temperature is raised to 55 to 65 ° C with stirring at 1500 to 1900 rpm, Followed by cooling to 40 DEG C while stirring at 600 to 900 rpm to prepare a base portion.
Finally, the fourth step is to manufacture the Hardener part.
5 to 15 parts by weight of a modified polyamine curing agent resin (for example, a modified alicyclic polyamine or a modified aliphatic polyamine curing agent resin) and 0.5 to 2 parts by weight of a curing accelerator are mixed and stirred at 600 to 900 rpm for 10 to 20 minutes, 5 parts by weight of extender pigments (talc, mica, silica, barium sulfate and kaolin) are added thereto, and stirred hardener parts are produced at 1500 to 1900 rpm for 20 to 30 minutes. That is, it is preferable to apply a modifying polyamine as the hardening agent resin to make a physical bonding with a chemical bond. When the amount of the hardener is too much, unreacted materials are released and remain on the surface, If a too small amount of a curing agent is added, a hard coating film can not be obtained due to insufficient curing, so that desired physical properties of a coating film can not be obtained.
The coating composition thus prepared is capable of functioning as a semi-permanent protection of the object with high durability and high contact force function of the material including the inner surface of the water pipe.
The present invention can be used not only as a composition for a conventional coating material including the inner surface of a coated steel pipe for water use, but also as a coating composition for domestic and underground buried waterworks and waterworks in domestic and overseas water industries.
Existing water pipe coatings for water pipes of KSD 8502 have been applied as coatings satisfying the physical properties of paints and other coating properties such as liquid epoxy resin coatings for coatings and coating methods for water use. However, due to the nature of the waterworks, (High durability) due to the direct influence of the impact on the environment. In addition, the existing underground waterworks have a water pollution factor due to aging of 20 ~ 30 years, but replacement and repair painting is not done, so the life time of the protective coating inside the steel pipe is lowered and the corrosion and long- .
According to the coating composition of the present invention, it is fundamentally improved and has a long-lasting high durability and a high quality. Thus, it has a long-lasting effect suitable for the basic performance, environmental performance and accelerated life reliability evaluation standard of solvent-based epoxy paint, And a sufficient reduction in the management cost.
The invention will now be described with reference to examples.
Table 1 is a table showing Examples and Comparative Examples prepared according to the above-mentioned method.
1) Epoxy resin: Epoxy resin The epoxy equivalent is 165 to 250, the viscosity is 2,000 to 3,500 cps, the modified rubber epoxy equivalent is 200 to 250, and the viscosity is 8,000 to 17,000 cps.
A modified bisphenol F type epoxy resin (trade name: YDF-161)
㉡ Phenol novolak type epoxy resin (trade name: KER 153PN)
㉢ BPA No-block type epoxy resin (trade name: KBPN-110)
Modified Rubber Epoxy Resin (Product Name: KER 827RS)
2) Reactive diluent: ⓐ Bifunctional glycidyl amine compound (HJ epial-DA803)
(B) a polyfunctional glycidyl ether compound (HJ Epiol DE-200)
3) Silane coupling: 3-glycidoxypropyltrimethoxysilane (Shameter OFS-6040), methacryloxypropyltrimethoxysilane (Shameter OFS-6030)
4) Bentonite-based anti-settling agent (Bentone SD-2)
5) Color Pigment: Titanium oxide (TiO 2 R 900, DuPont)
6) Ceramic: aluminum silicate system (zeolite)
7) Extention Pigment: talc, mica, silica, barium sulfate, kaolin
8) Anticorrosive pigments: aluminum dihydrogen triphosphate, zinc phosphate, zinc molybdate, zinc aluminum tripolyphosphate, aluminum phosphate
9) Anti-flow agent: castor oil derivative anti-sag agent (REOX)
10) Resin made of modified aliphatic, alicyclic polyamine: polyamine (KH-818B)
11) Curing accelerator: 2,4,6-trimethylaminomethylphenol
As shown in Table 1, the compositions of Base 1 to 6 were sequentially added to the dispersion vessel, and the mixture was stirred at 600 to 900 rpm for 10 to 20 minutes, and then the mixture was stirred at 600 to 900 rpm Followed by stirring for 10 to 20 minutes. Then, the composition of 8 to 20 is added in order and wetted with stirring at 1200 to 1500 rpm for 20 to 30 minutes. Thereafter, the mixture was dispersed at a particle size of 60 microns or less by using a dispersing machine, 21 was added, the temperature was raised from 1500 to 1900 rpm to 55 to 65 ° C, and the mixture was slowly cooled to 40 ° C with stirring at 600 to 900 rpm.
The Hardener part is added to the container in the order of 22 to 24, and then stirred at 600 to 900 rpm for 10 to 20 minutes, then 25 is added, and uniformly prepared at 1500 to 1900 rpm for 20 to 30 minutes using a high-speed stirrer.
The epoxy coating material thus prepared contained bubbles and was allowed to stand for a certain period of time. The coating material was stabilized, and then the base part and the hardener part were mixed in a ratio of 1: 0.3 by volume using a stirrer, and the mixture was aged for 10 to 20 minutes.
As the painting conditions, it is possible to apply the epoxy-type long-term high durability (high durability) to the test specimen treated with surface pretreatment SSPC SP-10 by sandblasting, sandblasting, ) Paint was applied as a dry film one time. The airless spray was reciprocated so as to become a dry film of 400 microns or more, and a paint film having an epoxy long-term high durability was formed.
As shown in Table 2, the excellent epoxy anticorrosive coating composition prepared as described above had a nonvolatile content of 91 to 98% and a viscosity of 130 to paste in a Krebs-Unit viscometer. The specific gravity The results were as follows: 1) The stability of the coating was good, but the viscosity of the coating was not changed. Therefore, the epoxy - based long - term high durability (high durability It has been confirmed that the paint has a function as a function.
The method of coating workability test of the epoxy anticorrosive coating composition of the present invention is carried out by mixing with the curing agent of the paint using airless spraying equipment and agitating the electric motor.
1) Condition in the container: uniformly dispersed without dust, foreign matter, and sediment lumps
2) Touch dry, cure dry DFT condition: 400 ㎛
3) Airless Spray: The dry film thickness should be applied once to dry film 400 ~ 600㎛ to obtain smooth film.
4) Flexibility of the film: The film is bent gradually to the 1/3 point of the film surface, and the curved film surface is measured for cracks and delamination with a pinhole measuring device applied with voltage of 1500V
5) Impact resistance: DuPont type impact tester 1/2 "× 1000g × 40㎝ No crack or peeling
6) Adhesion: Pull-off Strength of Coatings Using Protective Adhesion Testers (ASTM D4541), 10 N / ㎟ or more
7) Chemical resistance: 25 ℃, 5% HCl × 30 days. It should be soaked in 5% NaOH, washed in running water after the end of the test, and kept at room temperature for 2 hours. After that, there should be no wrinkles, cracks, swelling and peeling of the film.
8) Water resistance Appearance: 50 ± 3 ℃ × 2,000 hours Dipping in tap water to avoid cracking, swelling, peeling and rust.
9) Impact resistance after water resistance test: DuPont type impact tester 1/2 "× 1000g × 40㎝ No crack or peeling
10) Resistance to bending after water resistance test: It gradually bends to 1/3 of the coating film surface, and the curved film surface is measured by pinhole meter with 1500V voltage applied for cracking and peeling.
11) Adhesion after water resistance test: Pull-off Strength of Coatings Using Protective Adhesion Testers (ASTM D4541), 2.5 N / ㎟ or more
12) Salt water spray: Appearance should be less than 0.5% of crack, swelling, less than 0.5% of rust occurrence in non-scribed part and less than 1% of rust occurrence in X-cut part.
13) Cycle test: Water temperature 2 hours each at 0 ℃, 20 ℃, 60 ℃ for 2 hours 500 cycles × 3,000 hours No appearance of cracks, swelling, peeling, and rust. The impact resistance is 1/2 " × 1000 g × 40 cm No cracks and peeling, bending resistance gradually bends to 1/3 of the coated film surface, and the curved coated film surface is measured with a pinhole measuring device to which 1,500 V voltage is applied. Pull-off Strength of Coatings Using Protective Adhesion Testers (ASTM D4541), 2.5 N / ㎟ or more
As shown in Table 2, in the epoxy resin coating composition, epoxy resin was mixed and reacted according to the characteristics of epoxy resin, urethane resin, urethane resin, urethane resin, and reactive diluent. Examples 1 to 3 using epoxy resins ㉠, ㉡, ㉣ showed better performance than Comparative Examples 1 to 7 using ㉠ and..
Comparative Examples 1 to 7 showed poor results in terms of impact resistance, acid resistance, water resistance and the like. On the other hand, Examples 1 to 3 all have commercial value, but Example 3, in which two kinds of diluent of a multi-functional group are mixed, is superior in performance such as flex resistance, chemical resistance, and adhesion. However, the results were unsatisfactory in the impact resistance and water resistance test of the coating film. In addition, it was improved at low point so that workability of airless painting could be improved. However, coating workability was not smooth due to high viscosity in winter.
Therefore, a further experiment was conducted on the mixing ratio of the high durability epoxy resin and the reactive diluent so as to achieve the standard by supplementing the low viscosity, impact resistance and water resistance.
The composition of the anticorrosive paint according to the mixing ratio of the epoxy resin and the reactive diluting agent tested by the inventors is shown in Table 3 below.
1) Epoxy resin: Epoxy resin The epoxy equivalent is 165 to 250, the viscosity is 2,000 to 3,500 cps, the modified rubber epoxy equivalent is 200 to 250, and the viscosity is 8,000 to 17,000 cps.
A modified bisphenol F type epoxy resin (trade name: YDF-161)
㉡ Phenol novolak type epoxy resin (trade name: KER 153PN)
㉢ BPA No-block type epoxy resin (trade name: KBPN-110)
Modified Rubber Epoxy Resin (Product Name: KER 827RS)
2) Reactive diluent: ⓐ Bifunctional glycidyl amine compound (HJ epial-DA803)
(B) a polyfunctional glycidyl ether compound (HJ Epiol DE-200)
3) Silane coupling: 3-glycidoxypropyltrimethoxysilane (Shameter OFS-6040), methacryloxypropyltrimethoxysilane (Shameter OFS-6030)
4) Bentonite-based anti-settling agent (Bentone SD-2)
5) Color Pigment: Titanium oxide (TiO 2 R 900, DuPont)
6) Ceramic: aluminum silicate system (zeolite)
7) Extention Pigment: talc, mica, silica, barium sulfate, kaolin
8) Anticorrosive pigments: aluminum dihydrogen triphosphate, zinc phosphate, zinc molybdate, zinc aluminum tripolyphosphate, aluminum phosphate
9) Anti-flow agent: castor oil derivative anti-sag agent (REOX)
10) Resin made of modified aliphatic, alicyclic polyamine: polyamine (KH-818B)
10) Curing accelerator: 2,4,6-trimethylaminomethylphenol
As shown in Table 3, the compositions of Base 1 to 6 in the compositions 1 to 25 were added to the dispersion vessel in order and mixed and stirred at 600 to 900 rpm for 10 to 20 minutes, Followed by stirring for 10 to 20 minutes. Then, the composition of 8 to 20 is added in order and wetted with stirring at 1200 to 1500 rpm for 20 to 30 minutes. Thereafter, the mixture was dispersed at a particle size of 60 microns or less by using a dispersing machine, 21 was added, the temperature was raised from 1500 to 1900 rpm to 55 to 65 ° C, and the mixture was slowly cooled to 40 ° C with stirring at 600 to 900 rpm.
The Hardener part is added to the container in the order of 22 to 24, and then stirred at 600 to 900 rpm for 10 to 20 minutes, then 25 is added, and uniformly prepared at 1500 to 1900 rpm for 20 to 30 minutes using a high-speed stirrer.
The epoxy - based paint prepared in this way contained bubbles and allowed to stand for a certain period of time. After stabilizing the paint, the base and Haedener parts were mixed in a 1: 0.3 volume ratio using a stirrer and coated on the substrate after aging for 10 to 20 minutes.
As the painting conditions, it is possible to apply the epoxy-type long-term high durability (high durability) to the test specimen treated with surface pretreatment SSPC SP-10 by sandblasting, sandblasting, ) Paint was applied as a dry film one time. The airless spray was reciprocated so as to become a dry film of 400 microns or more, and a paint film having an epoxy long-term high durability was formed.
As shown in Table 4, the excellent epoxy anticorrosive coating composition of the present invention thus prepared had a nonvolatile content of 94 to 99% and a viscosity of 110 to 140 as measured by a Krebs-Unit viscometer. The specific gravity The results showed that the sedimentation state of the coatings was good and the viscosity of the coatings hardly changed. As a result, it was found that the epoxy type long term high durability It has been confirmed that the paint has a function as a function.
The method of coating workability test of the epoxy anticorrosive coating composition of the present invention is carried out by mixing with the curing agent of the paint using airless spraying equipment and agitating the electric motor.
1) Condition in the container: uniformly dispersed without dust, foreign matter, and sediment lumps
2) Touch dry, cure dry DFT condition: 400 ㎛
3) Airless Spray: The dry film thickness should be applied once to dry film 400 ~ 600㎛ to obtain smooth film.
4) Flexibility of the film: The film is bent gradually to the 1/3 point of the film surface, and the curved film surface is measured for cracks and delamination with a pinhole measuring device applied with voltage of 1500V
5) Impact resistance: DuPont type impact tester 1/2 "× 1000g × 40㎝ No crack or peeling
6) Adhesion: Pull-off Strength of Coatings Using Protective Adhesion Testers (ASTM D4541), 10 N / ㎟ or more
7) Chemical resistance: 25 ℃, 5% HCl × 30 days. It should be soaked in 5% NaOH, washed in running water after the end of the test, and kept at room temperature for 2 hours. After that, there should be no wrinkles, cracks, swelling and peeling of the film.
8) Water resistance Appearance: 50 ± 3 ℃ × 2,000 hours Dipping in tap water to avoid cracking, swelling, peeling and rust.
9) Impact resistance after water resistance test: DuPont type impact tester 1/2 "× 1000g × 40㎝ No crack or peeling
10) Resistance to bending after water resistance test: It gradually bends to 1/3 of the coating film surface, and the curved film surface is measured by pinhole meter with 1500V voltage applied for cracking and peeling.
11) Adhesion after water resistance test: Pull-off Strength of Coatings Using Protective Adhesion Testers (ASTM D4541), 2.5 N / ㎟ or more
12) Salt water spray: Appearance cracks, swelling, etc. should be less than 0.5%, rust shall be less than 0.5% for non-scribed parts, and less than 1% for rust of X-cut parts.
13) Cycle test: Water temperature 2 hours each at 0 ℃, 20 ℃, 60 ℃ for 2 hours 500 cycles × 3,000 hours No appearance of cracks, swelling, peeling, and rust. The impact resistance is 1/2 " × 1000 g × 40 cm No cracks and peeling, bending resistance gradually bends to 1/3 of the coated film surface, and the curved coated film surface is measured with a pinhole measuring device to which 1,500 V voltage is applied. Pull-off Strength of Coatings Using Protective Adhesion Testers (ASTM D4541), 2.5 N / ㎟ or more
As shown in Table 4, in Examples 4, 5 and 6 in which epoxy resin ㉠: ㉡ (or ㉢): 혼합 was mixed at 3: 1.5~2.5: 0.5~1.5 Examples 4 and 6 using the foams of Example 5 and Comparative Example 5 were proved to have excellent properties such as impact resistance and water resistance.
In addition, In the case of 4 and 6, satisfactory results were obtained with respect to flexural resistance, adhesion, chemical resistance and other mechanical properties of the coating film. Further, except for Example 5, it was confirmed that the airless painting workability of both Examples 4 and 6 using the bifunctional reactive diluent alone or mixed was progressing smoothly even at low temperatures and in winter.
Therefore, Examples 4 and 6 are superior to those of Examples 1 to 3 in terms of high durability film performance and mechanical film performance after the test, since they are complementary to impact resistance, water resistance and low viscosity in Table 1 And showed excellent physical properties against the mechanical coating performance of the coating film after the other cycle tests, thereby exhibiting the desired effect.
Claims (9)
(2) Preparation of Base Part 2 Step 2: In the agitated material stirred in the first step, 1 to 20 parts by weight of titanium oxide as a color pigment, 0 to 20 parts by weight of extender pigment, 0 to 10 parts by weight Adding an anticorrosive pigment and dispersing it at a particle size of 60 microns or less by wetting with stirring at 1200-1500 rpm for 20-30 minutes,
(3) Preparation of Base Part Step 3: 0.1 to 5 parts by weight of castor oil derivative as an anti-sag agent was added to the agitated product dispersed in the second step and stirred at 1500 to 1900 rpm to obtain 55 The temperature was raised to -65 DEG C, and then gradually cooled to 40 DEG C with stirring at 600 to 900 rpm to prepare a base portion,
(4) Hardener Step 4: 5 to 15 parts by weight of a curing agent and 0.5 to 2 parts by weight of a curing accelerator are mixed and stirred at 600 to 900 rpm for 10 to 20 minutes. Subsequently, And stirring the mixture at 1500 to 1900 rpm for 20 to 30 minutes to prepare a hardener part.
(JP) METHOD FOR PREPARING POTENTIAL COMPOSITION OF HIGH - DURABLE COATING MATERIALS INCLUDING THE INTERNAL SURFACE OF WATER COATED PIPE.
Characterized in that in the second step, more than 0 to 10 parts by weight of ceramic is further added in addition to titanium oxide, extender pigment and rustproof pigment.
(JP) METHOD FOR PREPARING POTENTIAL COMPOSITION OF HIGH - DURABLE COATING MATERIALS INCLUDING THE INTERNAL SURFACE OF WATER COATED PIPE.
Characterized in that the ceramic is an aluminum silicate-
(JP) METHOD FOR PREPARING POTENTIAL COMPOSITION OF HIGH - DURABLE COATING MATERIALS INCLUDING THE INTERNAL SURFACE OF WATER COATED PIPE.
The epoxy resin added in the first step has an equivalent weight of 165 to 250,
Wherein the dosage ratio of the modified bisphenol F type epoxy resin, the phenol novolak type epoxy resin and the modified bisphenol A type rubber epoxy resin is 3: 1.5 to 2.5: 0.5 to 1.5,
(JP) METHOD FOR PREPARING POTENTIAL COMPOSITION OF HIGH - DURABLE COATING MATERIALS INCLUDING THE INTERNAL SURFACE OF WATER COATED PIPE.
Wherein the epoxy resin mixture to reactive diluent injected in the first step is in a weight ratio of 1: 0.2 to 0.5.
(JP) METHOD FOR PREPARING POTENTIAL COMPOSITION OF HIGH - DURABLE COATING MATERIALS INCLUDING THE INTERNAL SURFACE OF WATER COATED PIPE.
The silane-based coupling agent of the first step may contain,
Wherein the polymer is at least one selected from the group consisting of 3-glycidoxypropyltrimethoxysilane series and methacryloxypropyltrimethoxysilane series.
(JP) METHOD FOR PREPARING POTENTIAL COMPOSITION OF HIGH - DURABLE COATING MATERIALS INCLUDING THE INTERNAL SURFACE OF WATER COATED PIPE.
Wherein the extender pigments of the second and fourth stages,
Talc, mica, silica, barium sulfate, and kaolin.
(JP) METHOD FOR PREPARING POTENTIAL COMPOSITION OF HIGH - DURABLE COATING MATERIALS INCLUDING THE INTERNAL SURFACE OF WATER COATED PIPE.
The rust-preventive pigment of the second step,
Characterized in that it is at least one of aluminum dihydrogen triphosphate, zinc phosphate, zinc molybdate, zinc aluminum tripolyphosphate, and aluminum phosphate.
(JP) METHOD FOR PREPARING POTENTIAL COMPOSITION OF HIGH - DURABLE COATING MATERIALS INCLUDING THE INTERNAL SURFACE OF WATER COATED PIPE.
Wherein the curing agent in the fourth step is a modified polyamine.
(JP) METHOD FOR PREPARING POTENTIAL COMPOSITION OF HIGH - DURABLE COATING MATERIALS INCLUDING THE INTERNAL SURFACE OF WATER COATED PIPE.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101765116B1 (en) * | 2016-09-28 | 2017-08-07 | 이성식 | Method for manufacturing paint including chitosan ceramic for coating steel pipe, paint manufactured by the method, and the paint-coated steel pipe |
| KR101816149B1 (en) | 2017-08-28 | 2018-01-09 | 주식회사 태을이앤씨 | Composition for coating waterproof and rustproofing and method for manufacturing the same |
| CN109161296A (en) * | 2018-07-17 | 2019-01-08 | 常州大学 | A kind of anticorrosion epoxy resin coating and preparation method thereof suitable for natural gas line wall |
| KR102243858B1 (en) * | 2021-03-24 | 2021-04-23 | 주성이엔지 주식회사 | Method for producing an epoxy resin composition for steel pipes containing carbon nanotubes and an antibacterial agent |
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| JP2739252B2 (en) * | 1990-04-27 | 1998-04-15 | 大日本塗料株式会社 | Epoxy resin and epoxy resin coating composition containing the same |
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| KR101765116B1 (en) * | 2016-09-28 | 2017-08-07 | 이성식 | Method for manufacturing paint including chitosan ceramic for coating steel pipe, paint manufactured by the method, and the paint-coated steel pipe |
| KR101816149B1 (en) | 2017-08-28 | 2018-01-09 | 주식회사 태을이앤씨 | Composition for coating waterproof and rustproofing and method for manufacturing the same |
| CN109161296A (en) * | 2018-07-17 | 2019-01-08 | 常州大学 | A kind of anticorrosion epoxy resin coating and preparation method thereof suitable for natural gas line wall |
| KR102243858B1 (en) * | 2021-03-24 | 2021-04-23 | 주성이엔지 주식회사 | Method for producing an epoxy resin composition for steel pipes containing carbon nanotubes and an antibacterial agent |
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