KR101821033B1 - Polyurea composition for steel structure coating - Google Patents
Polyurea composition for steel structure coating Download PDFInfo
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- KR101821033B1 KR101821033B1 KR1020160002472A KR20160002472A KR101821033B1 KR 101821033 B1 KR101821033 B1 KR 101821033B1 KR 1020160002472 A KR1020160002472 A KR 1020160002472A KR 20160002472 A KR20160002472 A KR 20160002472A KR 101821033 B1 KR101821033 B1 KR 101821033B1
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- polyurea composition
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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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/02—Polyureas
-
- 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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
Abstract
The present invention relates to a polyurea composition for coating a steel structure, and more particularly, to a polyurea composition for coating a steel structure, which is environmentally friendly, has a remarkably low incidence of blistering at the time of coating, Lt; RTI ID = 0.0 > polyurea < / RTI >
Description
The present invention relates to a polyurea composition for coating a steel structure, and more particularly, to a polyurea composition for coating a steel structure, which is environmentally friendly, has a remarkably low incidence of blistering at the time of coating, Lt; RTI ID = 0.0 > polyurea < / RTI >
Korean Patent Application No. 10-2011-0074427 discloses a polyurea resin coating composition for coating inner and outer surfaces of steel pipes and a method for producing the same. In this case, improvement in storage stability and viscosity of the coating composition, Use alkylene carbonate to improve coating leveling during mixing and spraying of paints. However, when the alkylene carbonate is applied to the paint for the inner and outer coating of the steel pipe, there is a problem that blisters tend to occur on the coated surface.
Korean Patent Application No. 10-2006-0127017 discloses a polyurea coating agent for coating a water pipe and a method of manufacturing the same. In order to prevent the viscosity of the prepolymer from being increased or the reaction to proceed easily, The alkylene carbonate is used as a stabilizer (viscosity-reducing agent). However, as described above, there is also a problem that swelling occurs on the coated surface due to the use of alkylene carbonate. Further, in the prepolymer synthesis of urethane or urea, the increase in viscosity due to the explosive raising reaction does not occur when the NCO% is 12% or more.
Further, when the alkylene carbonate is used as in the above-mentioned prior arts, the VOC emission amount according to the small-chamber method is not released and is not environmentally friendly.
It is an object of the present invention to provide a polyurea resin composition which is environmentally friendly because it does not use an alkylene carbonate, has a remarkably low incidence of blistering at the time of coating, has excellent adhesion to steel substrates and is excellent in durability and is particularly suitable for coating steel structures, To provide a composition.
The polyurea composition of the present invention comprises (1) a main part comprising (i) an isocyanate component comprising a modified methylenebisphenyl group and (ii) a polyoxyalkylene glycol component; And (2) a curing agent part comprising (i) a polyamine resin component, (ii) a chain extender component, and (iii) an additive component, wherein the modified methylene bisphenyl group Wherein the content of the isocyanate component is 35 to 77 parts by weight, and the subject portion does not contain an alkylene carbonate.
The polyurea composition according to the present invention is environmentally friendly because it does not use an alkylene carbonate, has a remarkably low incidence of swelling at the time of coating, has excellent adhesion to steel pavement, has excellent durability, and is suitable for sanitary safety standards It meets the hygiene safety standards in accordance with the regulations on certification and conforms to the certification standards of the products subject to environmental labeling in accordance with the Environmental Technology and Environmental Industry Support Act. The standard of KWWA D 113 (waterborne polyurea painted steel pipe and drainage pipe) of the Korean water and sewage societies is based on the standards of 80% confidence level, 90% of products after 20 years use. Satisfies.
Hereinafter, the present invention will be described in detail.
The subject portion of the polyurea composition of the present invention comprises an isocyanate component comprising a modified methylenebisphenyl group wherein the content of isocyanate comprising a modified methylenebisphenyl group is from 35 to 77 parts by weight based on 100 parts by weight of the subject portion , More specifically from 60 to 75 parts by weight, and even more specifically from 65 to 70 parts by weight. If the content of the isocyanate containing the modified methylenebisphenyl group is less than 35 parts by weight based on 100 parts by weight of the main portion, there may be a problem that the mechanical strength of the finally obtained coating film becomes weak, and if it exceeds 77 parts by weight, The viscosity of the coating material may be excessively increased and the coating operation may be difficult, and there may be a problem that the elasticity of the coating film obtained finally decreases.
Examples of the isocyanate containing a modified methylene bisphenyl group usable in the present invention include those having an NCO content of 28.6 to 29.6 wt%, a viscosity of 20 to 60 cps and a specific gravity of 1.195 to 1.230, It is not.
According to one embodiment, as the isocyanate containing the modified methylenebisphenyl group, for example, an isocyanate including a structure in which two methylene phenyl groups are connected by a carbodiimide bond, for example, an isocyanate having the following structure can be used.
According to one embodiment, the subject portion of the polyurea composition of the present invention may further comprise an aromatic isocyanate component other than the isocyanate comprising the modified methylenebisphenyl group. Examples of the aromatic isocyanate component which can be further included include 2,4'-diphenylmethane diisocyanate, 4,4'-diphenylmethane diisocyanate, polymethylene polyphenyl isocyanate, methylene bis (p-cyclohexyl isocyanate) and But the present invention is not limited thereto. The content may be, for example, 1 to 15 parts by weight based on 100 parts by weight of the main portion, but is not limited thereto.
The subject portion of the polyurea composition of the present invention comprises a polyoxyalkylene glycol component.
As the polyoxyalkylene glycol component, for example, polyoxyethylene glycol, polyoxypropylene glycol or a combination thereof can be used. The physical properties of the polyoxyalkylene glycol component are, for example, a molecular weight (MW) of 100 to 3000, a hydroxyl value of 54.0 to 58.0 mgKOH / g, an acid value of 0.03 mgKOH / g or less, and a viscosity of 260 to 340 cps, but is not limited thereto.
The content of the polyoxyalkylene glycol component in the subject portion of the polyurea composition of the present invention may be, for example, 22 to 50 parts by weight, more specifically 25 to 40 parts by weight, based on 100 parts by weight of the main portion , And even more specifically from 30 to 35 parts by weight. If the content of the polyoxyalkylene glycol component is too low, the viscosity of the coating may be excessively increased, which may result in difficulty in coating work, and there may be a problem of reducing the elasticity of the finally obtained coating film. On the other hand, There may be a problem getting rid of.
The main part of the polyurea composition of the present invention does not contain an alkylene carbonate which causes swelling on the coating surface.
The curing agent portion of the polyurea composition of the present invention comprises a polyamine resin component.
As the polyamine resin component, a polyoxyalkylene polyamine resin having 2 to 3 amine functional groups can be used (wherein the alkylene is, for example, C 2 -C 3 alkylene), for example, a polyoxypropylene diamine resin, A rely polyoxypropylenetriamine resin, or a combination thereof. The molecular weight (MW) thereof may be, for example, 300 to 5000, but is not limited thereto.
The content of the polyamine resin component in the curing agent part of the polyurea composition of the present invention may be, for example, 10 to 50 parts by weight, more specifically 20 to 50 parts by weight, based on 100 parts by weight of the curing agent part. If the content of the polyamine resin component is too small, the curing reaction between the main portion and the curing agent becomes uneven, and the coating film may be cured to cause problems such as bubbling or swelling on the surface of the coating film. If the amount is too large, the curing reaction between the main portion and the curing agent portion becomes uneven When the coating is cured, there may be a problem of not sticking and sticking.
The curing agent portion of the polyurea composition of the present invention comprises a chain extender component.
As the chain extender component, an aromatic amine compound may be used, and more preferably, a combination of a single aromatic primary amine, a bis aromatic primary amine, and an aromatic secondary amine may be used. Amine chain extender is a chain extender. It serves to extend the chain of urea bond between isocyanate prepolymer and amine as a curing agent, and allows various physical properties to be controlled depending on the kind. Means a primary amine compound having one aromatic ring in the molecule and the term " bis aromatic primary amine " means that two aromatic rings in the molecule are directly bonded or a divalent linking group ( Such as, for example, a methylene group, etc.).
According to one embodiment, the monoaromatic primary amine may have an amine value of 628 to 634 mgKOH / g, for example, a dialkyltoluenediamine wherein the alkyl is, for example, C 1 -C 4 alkyl For example, diethyltoluenediamine) may be used, and the amount thereof may be, for example, 1 to 10 parts by weight, more specifically 1.5 to 8 parts by weight, based on 100 parts by weight of the curing agent.
According to one embodiment, the bis aromatic primary amine may have an amine value of 153 to 161 mgKOH / g, and examples thereof include methylene bischloroaniline (e.g., 4,4'-methylenebis (2-chloroaniline ) May be used, and the amount thereof may be, for example, 21 to 39 parts by weight, more specifically 25 to 35 parts by weight, based on 100 parts by weight of the curing agent.
According to one embodiment, the aromatic secondary amine having an amine value of 7.4 to 7.6 mgKOH / g may be used. For example, benzene amine may be used. The amount of the aromatic amine to be used may be, based on 100 parts by weight of the curing agent, 6 to 39 parts by weight, and more specifically 10 to 35 parts by weight.
According to one preferred embodiment of the present invention, a combination of dialkyltoluenediamine, benzeneamine and 4,4'-methylenebis (2-chloroaniline) is used as the chain extender component.
The content of the chain extender component in the curing agent portion of the polyurea composition of the present invention may be, for example, 28 to 87 parts by weight, more specifically 35 to 75 parts by weight, based on 100 parts by weight of the curing agent portion. If the content of the chain extender component is too small, there may be a problem that tensile strength and tearing performance of the final coating film obtained become weak. If the content is too large, there is a problem that the final coating film is easily broken or broken by external impact.
The curing agent portion of the polyurea composition of the present invention comprises an additive component.
As the additive component, for example, at least one selected from ultraviolet stabilizers, adhesion promoters, colorants, viscosity regulators, antifoaming agents and surface conditioners can be used.
The amount of the additive component contained in the curing agent portion of the polyurea composition of the present invention may be, for example, 3 to 22 parts by weight, more specifically 5 to 15 parts by weight, based on 100 parts by weight of the curing agent portion, It is not. The ultraviolet light stabilizer may be used in an amount of 0.5 to 3 parts by weight, the adhesion promoting agent may be used in an amount of 0.5 to 5 parts by weight, and the coloring agent may be used in an amount of 2 to 7 parts by weight, based on 100 parts by weight of the curing agent, no.
Hereinafter, the present invention will be described in more detail with reference to Examples. However, the scope of the present invention is not limited to the embodiments.
[ Example ]
1. Preparation of Coating Composition
The components of the composition shown in Table 1 below were used to prepare a coating composition.
Resin 1-1: Modified methylenebisphenylisocyanate (a structure in which two methylene phenyl groups are connected by carbodiimide bond, trade name: Cosmonate LL)
Resin 1-2: 4,4'-diphenylmethane diisocyanate
Resin 1-3: 2,4'-diphenylmethane diisocyanate
Resin 1-4: polyoxypropylene glycol (molecular weight (MW): 2000)
Additive 1-1: alkylene carbonate (ethylene carbonate)
Resin 2-1: Polyoxypropylene diamine
Resin 2-2: Glyceryl polyoxypropylenetriamine
Chain extender 1: diethyltoluenediamine < RTI ID = 0.0 >
Chain extension 2: benzene amine
Chain elongation 3: 4,4'-methylene bis (2-chloroaniline)
Additive 2-1: adhesion promoter (gamma-glycidoxypropyltrimethoxysilane)
Additive 2-2: UV stabilizer (N- (4-ethoxycarbonylphenyl) -N'-methyl-N'-phenylformamidine and bis (1,2,2,6,6- Piperidinyl) -s sebacate < / RTI >
Additive 2-3: Concentrate
2. Evaluation of Physical Properties of Coating Composition
Each of the paints prepared above was coated on a steel substrate having a surface roughness of 30 microns or more and subjected to a blast cleaning and surface treatment at a temperature of Sa2.5 or more and the physical properties of each item described in Table 2 were evaluated. Respectively.
Property evaluation method
1) Appearance
Test method: KS M 5000
Evaluation criteria: There should be no shedding, frying, cracking, swelling, pinholes, etc.
2) Water resistance
Test method: KS N ISO 2812-1
Evaluation criteria: After the water resistance evaluation of 2000 hours, 1.5 mm or more and the adhesion strength should be 4.0 N / mm 2 or more when evaluating the flexural resistance.
3) Salt water silent
Test method Standard number: KS D 9502
Evaluation criteria: After 500 hours of salt water spray test, according to the criteria of ASTM D 1654, KS M ISO 21227-1,3, the non-scribed test showed that the tack area of the coating was within 0.5% Should be within 1.0%.
4) tensile strength, Elongation rate , Phosphorus strength
Test method: KS F 4922
5) Hardness
Test method: ASTM D 2240
6) Bond strength
Test method: ASTM D 4541
7) Impact resistance
1 kg of weight was dropped from a height of 30 cm, and the crack and peeling state of the coating film were visually evaluated
8) Flexibility
Use Ericsson tester to measure the depth of press until the coating is free of defects
Claims (6)
(2) a curing agent part comprising (i) a polyamine resin component, (ii) a chain extender component and (iii) an additive component,
Wherein the content of the isocyanate component including the modified methylenebisphenyl group in the main part is 35 to 77 parts by weight and the main part does not include an alkylene carbonate,
Wherein the chain extender component is a combination of a single aromatic primary amine, a bis aromatic primary amine and an aromatic secondary amine, the content of the single aromatic primary amine in 100 parts by weight of the curing agent is 1 to 10 parts by weight, Wherein the content of the aromatic primary amine is 21 to 39 parts by weight and the content of the aromatic secondary amine is 6 to 39 parts by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020160002472A KR101821033B1 (en) | 2016-01-08 | 2016-01-08 | Polyurea composition for steel structure coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020160002472A KR101821033B1 (en) | 2016-01-08 | 2016-01-08 | Polyurea composition for steel structure coating |
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| Publication Number | Publication Date |
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| KR20170083250A KR20170083250A (en) | 2017-07-18 |
| KR101821033B1 true KR101821033B1 (en) | 2018-01-22 |
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| KR1020160002472A KR101821033B1 (en) | 2016-01-08 | 2016-01-08 | Polyurea composition for steel structure coating |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102635744B1 (en) * | 2023-05-04 | 2024-02-13 | (주)씨티기술 | Quick-curing type polyurea composition having excellent thermo shield and heat insulation function and quick-curing type thermo shield and heat insulation waterproofing method for concrete structure using the same |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102047970B1 (en) * | 2019-04-24 | 2019-11-22 | 세인스틸 주식회사 | steel pipe coating composition of polyurea systematic resin use for Improved durability and water resistance, a steel pipe using thereof |
| KR102416202B1 (en) | 2020-02-06 | 2022-07-04 | 부경대학교 산학협력단 | Apparatus for classification based on convolution neural network with enhanced accuracy |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000007989A (en) | 1998-06-24 | 2000-01-11 | I C K Kk | Cold curable composition for forming waterproof coating film |
| KR101035006B1 (en) * | 2011-01-04 | 2011-05-17 | 주식회사 케이씨씨 | Multilayered paint coating for water treatment facility and its coating method, and water treatment facility comprising the same |
-
2016
- 2016-01-08 KR KR1020160002472A patent/KR101821033B1/en active IP Right Grant
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000007989A (en) | 1998-06-24 | 2000-01-11 | I C K Kk | Cold curable composition for forming waterproof coating film |
| KR101035006B1 (en) * | 2011-01-04 | 2011-05-17 | 주식회사 케이씨씨 | Multilayered paint coating for water treatment facility and its coating method, and water treatment facility comprising the same |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102635744B1 (en) * | 2023-05-04 | 2024-02-13 | (주)씨티기술 | Quick-curing type polyurea composition having excellent thermo shield and heat insulation function and quick-curing type thermo shield and heat insulation waterproofing method for concrete structure using the same |
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| KR20170083250A (en) | 2017-07-18 |
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