CN113980560B - Powder coating special for coil steel and preparation method thereof - Google Patents
Powder coating special for coil steel and preparation method thereof Download PDFInfo
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- CN113980560B CN113980560B CN202111546594.2A CN202111546594A CN113980560B CN 113980560 B CN113980560 B CN 113980560B CN 202111546594 A CN202111546594 A CN 202111546594A CN 113980560 B CN113980560 B CN 113980560B
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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
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
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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
- C09D5/03—Powdery paints
- C09D5/033—Powdery paints characterised by the additives
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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
- C09D5/18—Fireproof paints including high temperature resistant 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/47—Levelling agents
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
- C08K2003/382—Boron-containing compounds and nitrogen
- C08K2003/385—Binary compounds of nitrogen with boron
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Abstract
The invention provides a powder coating special for coil steel and a preparation method thereof, wherein the powder coating comprises the following raw materials: 600-700 parts of super-weather-resistant resin, 40-50 parts of TGIC, 50-100 parts of boron nitride powder, 0-200 parts of titanium dioxide, 10-20 parts of leveling agent, 10-20 parts of crosslinking assistant, 0-10 parts of temperature-resistant pigment and 0-10 parts of antioxidant. The boron nitride has excellent corrosion resistance and heat conductivity, and the addition of the boron nitride not only improves the solvent resistance and the flexibility, but also shortens the curing temperature of the coating and meets the rapid curing condition. The acetyl of the cellulose acetate butyrate leveling agent can greatly improve the tensile strength of the coating besides the leveling performance, and is matched with boron nitride for use, so that the flexibility of the coating is greatly improved. Compared with the prior art, the coating has the characteristics of high flexibility, high temperature resistance and quick curing. The coating disclosed by the invention is resistant to solvent wiping and meets the use requirements of pre-coiled steel.
Description
Technical Field
The invention belongs to the field of coatings, and particularly relates to a powder coating special for coil steel and a preparation method thereof.
Background
Powder coating is an environment-friendly coating with extremely low solvent discharge amount, the requirement of environmental protection is a great driving force for promoting the development of powder coating, and manufacturers are seeking ways for reducing VOC (volatile organic compounds), so that the powder coating naturally replaces liquid coating in certain fields.
The pre-coated coil steel is a metal appearance material commonly used in the metal processing industry at present, has good processing performance, convenient use and strong weather resistance, and the coil steel needs to be quickly sprayed due to large length and requires high curing speed, and the coating used at present is mainly solvent-based paint.
The pre-coated coil steel is mainly provided with two problems of environmental pollution, a large amount of VOC contained in the solvent type coating, high cost, the same spraying thickness, 3-4 times of spraying of liquid coating, one-time spraying of powder coating and the like of weather resistance and corrosion resistance.
Disclosure of Invention
The invention aims to provide a powder coating special for coil steel and a preparation method thereof, which have high flexibility, high temperature resistance and quick curing; and the coating can resist solvent wiping and meet the use requirement of pre-coiled steel.
The specific technical scheme of the invention is as follows:
the powder coating special for coil steel comprises the following raw materials in parts by mass:
the super weather-resistant resin meets the following technical indexes: the acid value is 30-36mgKOH/g, the viscosity is 5000-7000mPa.s/200 ℃, and the glass transition temperature is 65 ℃.
The super-weatherable resin is preferably Zhan Xin CryLCOAT 4488-0 polyester resin.
The TGIC, triglycidyl isocyanurate, density: 1.46g/ml (23 ℃), melting point: 95-98 ℃.
The titanium dioxide is rutile titanium dioxide;
the boron nitride powder is hexagonal boron nitride powder.
The leveling agent is selected from cellulose acetate butyrate leveling agents.
The crosslinking assistant is a titanate coupling agent selected from a titanate coupling agent TC-114 in the day chemical industry;
the temperature-resistant pigment is selected from ferromanganese black, and the ferromanganese black has excellent heat resistance, light resistance, acid resistance, alkali resistance, solvent resistance, weather resistance, no migration, environmental protection and no toxicity.
The antioxidant is Basff 1010, and can effectively prevent the coating from being oxidized at a high temperature.
The invention provides a preparation method of a powder coating special for coil steel, which comprises the following steps:
1) Activation of boron nitride: stirring and mixing the crosslinking assistant and the boron nitride powder according to the formula amount;
2) Mixing the boron nitride powder treated in the step 1), the super weather-resistant resin, the TGIC, the titanium dioxide, the flatting agent, the temperature-resistant pigment and the antioxidant according to the formula amount, and then melting and extruding; tabletting, crushing and pulverizing to obtain the final product.
In the step 1), mixing a crosslinking assistant and isopropanol according to a volume ratio of 1;
preferably, in the step 1), spraying a crosslinking assistant to the boron nitride powder under stirring conditions; the stirring condition is 3000-5000 r/min;
in the step 2), the mixed materials are subjected to melt extrusion through a powder coating melt extruder, the extrusion temperature is controlled to be 110-120 ℃, and the screw rotation speed is controlled to be 35-40HZ;
in the step 2), the melted and extruded material is crushed after being tabletted, and the size of the crushed material is not more than 3 cm; the crushing means that: feeding the crushed sheet materials into a crusher for crushing; and (3) crushing, sieving, controlling a sieve mesh to be 180-220 meshes, and controlling the median D50=25-35 μm of the powder particle size after sieving.
In the present invention, boron nitride is a white loose powder having a soft and smooth texture. It has many properties similar to graphite, and is called "white graphite". The hexagonal boron nitride has good lubricity, has excellent corrosion resistance, is stable to carbon tetrachloride, ethanol, gasoline, benzene, acetone, concentrated sulfuric acid, concentrated nitric acid, concentrated phosphoric acid, 20% sodium hydroxide, dilute sulfuric acid and the like, has excellent heat-conducting property, and requires a fast curing temperature for coil powder coating. The acetyl of the cellulose acetate butyrate leveling agent can greatly improve the tensile strength of the coating besides the leveling performance, and is matched with boron nitride for use, so that the flexibility of the coating is greatly improved.
In the preparation process, the crosslinking assistant and the boron nitride powder are mixed and activated to modify the boron nitride powder, and then the modified boron nitride powder is mixed with other raw materials, so that the uniform and sufficient modification is facilitated, the solvent resistance of the coating is improved, and the thermal conductivity is better and more uniform.
All will process in coil steel later stage, buckle or punching press, have very high requirement to the pliability of coating, and, the coil steel all has several hundred meters long, and traditional curing means efficiency is too low, must be high temperature fast curing, in addition, can involve surface cleaning in the coil of strip use, needs the coating to have fine solvent resistance. Compared with the prior art, the coating has the characteristics of high flexibility, high temperature resistance and quick curing. The coating disclosed by the invention is resistant to solvent wiping and meets the use requirements of pre-coiled steel.
Detailed Description
Example 1
The powder coating special for coil steel comprises the following raw materials in parts by mass:
664 parts of superweatherable resin Zhanxin CRYLCOAT 4488-0 polyester resin
TGIC 50 parts
Hexagonal boron nitride powder 70 parts
30 parts of titanium dioxide
Cellulose acetate butyrate flatting agent 15 parts
13 portions of TC-114 titanate coupling agent
Manganese iron black 4 parts
Antioxidant Basff 1010 3 weight portions.
The TGIC, triglycidyl isocyanurate, density: 1.46g/ml (23 ℃), melting point: 95-98 ℃.
The titanium dioxide is rutile titanium dioxide.
The preparation method of the special powder coating for coil steel comprises the following steps:
1) Activation of boron nitride: mixing TC-114 titanate coupling agent with the formula amount and isopropanol with the same volume, spraying the mixture into hexagonal boron nitride powder under the stirring condition of 4000 revolutions per minute, and continuing stirring for 30min after spraying;
2) Mixing the boron nitride powder treated in the step 1), the super-weather-resistant resin, the TGIC, the titanium dioxide, the flatting agent, the temperature-resistant pigment and the antioxidant according to the formula ratio, and performing melt extrusion on the mixed material through a powder coating melt extruder, wherein the extrusion temperature is controlled to be 120 ℃, and the screw rotation speed is controlled to be 40HZ; crushing the melted and extruded material after tabletting, and controlling the size of the crushed material to be not more than 3 cm; the crushing means that: feeding the crushed sheet materials into a crusher for crushing; pulverizing, sieving with 180-220 mesh sieve, and controlling median diameter D50=25-35 μm.
The prepared powder coating special for coil steel is sprayed on a sample plate, and after the powder coating is sprayed once, the powder coating is cured under the following curing conditions: 260 ℃/60s; the curing condition of the common powder coating is 200 ℃/10 minutes, and the time is greatly shortened;
the technical indexes of the coating after the powder coating is cured are as follows:
weather resistance: the light retention rate of the xenon lamp is more than 93.4 percent in 2000 hours;
salt spray resistance: the neutral salt fog of the 5% sodium chloride is 1650 hours, and the single-edge corrosion is less than 2 mm;
and (3) impact resistance: the thickness of the coating film is 100 micrometers, the impact resistance is 100kg.cm, and the coating does not crack;
adhesion force: a hundred grid 0 level;
pencil hardness: not less than 3H;
t-shaped bending is more than or equal to 4T (the best state of common powder is 0T);
surface leveling property: the performance is excellent;
solvent-resistant wiping: butanone is wiped 120 times, and the coating has no obvious change (no more than 50 times of common powder coating).
Example 2
The powder coating special for coil steel comprises the following raw materials in parts by mass:
super-weatherable resin Zhanxin CRYLCOAT 4488-0 polyester resin 611 parts
TGIC 46 parts
80 parts of hexagonal boron nitride powder
Titanium dioxide 20 parts
16 portions of cellulose acetate butyrate flatting agent
14 parts of TC-114 titanate coupling agent
5 parts of manganese iron black
Antioxidant Pasteur 1010 parts.
The TGIC, i.e. triglycidyl isocyanurate, density: 1.46g/ml (23 ℃), melting point: 95-98 ℃.
The titanium dioxide is rutile titanium dioxide;
the preparation method of the special powder coating for coil steel comprises the following steps:
1) Activation of boron nitride: mixing TC-114 titanate coupling agent with the formula amount and isopropanol with the same volume, spraying the mixture into hexagonal boron nitride powder under the stirring condition of 3500 revolutions per minute, and continuing stirring for 40min after spraying is finished;
2) Mixing the boron nitride powder treated in the step 1), the super-weather-resistant resin, the TGIC, the titanium dioxide, the cellulose acetate butyrate flatting agent, the heat-resistant pigment manganese iron black and the antioxidant 1010 according to the formula ratio, and then performing melt extrusion on the mixed material through a powder coating melt extruder, wherein the extrusion temperature is controlled to be 115 ℃, and the screw rotation speed is controlled to be 40HZ; crushing the melt extruded material after tabletting, and controlling the size of the crushed material to be not more than 3 cm; the crushing means that: feeding the crushed sheet materials into a crusher for crushing; pulverizing, sieving with 180-220 mesh sieve, and controlling median diameter D50=25-35 μm.
The prepared powder coating special for coil steel is sprayed on a sample plate, and after the powder coating is sprayed once, the powder coating is cured under the following curing conditions: 260 ℃/60s; the curing condition of the common powder coating is 200 ℃/10 minutes, and the time is greatly shortened;
the technical indexes of the coating after the powder coating is cured are as follows:
weather resistance: the light retention rate of the xenon lamp is more than 91.8 percent after 2000 hours;
salt spray resistance: the neutral salt fog of 5% sodium chloride is 1600 hours, and the single-edge corrosion is less than 2 mm;
impact resistance: the thickness of the coating film is 100 micrometers, the impact resistance is 100kg.cm, and the coating does not crack;
adhesion force: a hundred grid 0 level;
pencil hardness: not less than 3H;
t-shaped bending is more than or equal to 4T (the best state of common powder is 0T);
surface leveling property: the performance is excellent;
solvent-resistant wiping: the butanone wiping time is 130 times, and the coating has no obvious change (the common powder coating does not exceed 50 times).
Comparative example 1
The powder coating special for coil steel comprises the following raw materials in parts by mass:
super weather-resistant resin super sword SJ4ET 611 parts
TGIC 46 parts
Hexagonal boron nitride powder 90 parts
Titanium dioxide 20 parts
Titanate coupling agent TC-114 parts
16 portions of cellulose acetate butyrate flatting agent
5 parts of manganese iron black
Antioxidant Pasf 1010 4 parts.
The TGIC, triglycidyl isocyanurate, density: 1.46g/ml (23 ℃), melting point: 95-98 ℃.
The titanium dioxide is rutile titanium dioxide;
the preparation method of the special powder coating for coil steel comprises the following steps:
mixing boron nitride powder, titanate coupling agent TC-114, super-weather-resistant resin, TGIC, titanium dioxide, flatting agent, temperature-resistant pigment and antioxidant according to the formula ratio at 2000 r/min, and performing melt extrusion on the mixed material through a powder coating melt extruder, wherein the extrusion temperature is controlled to be 115 ℃, and the screw rotation speed is controlled to be 40HZ; crushing the melted and extruded material after tabletting, and controlling the size of the crushed material to be not more than 3 cm; the crushing means that: feeding the crushed sheet materials into a crusher for crushing; pulverizing, sieving with 180-220 mesh sieve, and controlling median diameter D50=25-35 μm.
The prepared powder coating special for coil steel is sprayed on a sample plate, and after the powder coating is sprayed once, the powder coating is cured under the following curing conditions: 260 ℃/180s;
the technical indexes of the coating after the powder coating is cured are as follows:
weather resistance: the xenon lamp lasts for 2000 hours, and the light-preserving rate is 88 percent;
salt spray resistance: the 5% sodium chloride is subjected to neutral salt fog for 1000 hours, and the single-edge corrosion is less than 2 mm;
and (3) impact resistance: the thickness of a coating film is 100 micrometers, the impact resistance is 100kg.cm, and the coating cracks;
adhesion force: a hundred grid 3 level;
pencil hardness: not less than 3H;
2T-shaped bending;
surface leveling property: the performance is excellent;
solvent-resistant wiping: butanone was wiped 45 times and the coating started to change.
Comparative example 2
The powder coating special for coil steel comprises the following raw materials in parts by mass:
664 parts of superweatherable resin CRYLCOAT 4488-0 polyester resin
TGIC 50 parts
113 parts of titanium dioxide
Cellulose acetate butyrate flatting agent 15 parts
Manganese iron black 4 parts
And 1010 parts of antioxidant BASF.
The TGIC, triglycidyl isocyanurate, density: 1.46g/ml (23 ℃), melting point: 95-98 ℃.
The titanium dioxide is rutile titanium dioxide;
the preparation method of the special powder coating for coil steel comprises the following steps:
mixing the super weather-resistant resin, the TGIC, the titanium dioxide, the flatting agent, the ferromanganese black and the antioxidant Pasteur 1010 according to the formula amount, and performing melt extrusion on the mixed materials through a powder coating melt extruder, wherein the extrusion temperature is controlled to be 120 ℃, and the screw rotation speed is 40HZ; crushing the melted and extruded material after tabletting, and controlling the size of the crushed material to be not more than 3 cm; the crushing means that: feeding the crushed sheet materials into a crusher for crushing; pulverizing, sieving with 180-220 mesh sieve, and controlling median diameter D50=25-35 μm.
The prepared powder coating special for coil steel is sprayed on a sample plate, and after the powder coating is sprayed once, the powder coating is cured under the following curing conditions: 260 ℃/5min30s;
the technical indexes of the coating after the powder coating is cured are as follows:
weather resistance: the light retention rate of the xenon lamp is more than 85 percent in 2000 hours;
salt spray resistance: the 5% sodium chloride is subjected to neutral salt spray for 400 hours, and the single-edge corrosion is less than 2 mm;
and (3) impact resistance: the thickness of a coating film is 100 micrometers, the impact resistance is 100kg.cm, and the coating cracks;
adhesion force: a hundred grid 3 level;
pencil hardness: not less than 3H;
0T of T-shaped bending;
surface leveling property: the method is excellent;
solvent-resistant wiping: butanone was wiped 20 times and the coating started to change.
Claims (5)
1. The powder coating special for coil steel is characterized by comprising the following raw materials in parts by mass:
600-700 parts of super weather-resistant resin
TGIC40-50 parts
50-100 parts of boron nitride powder
0-200 parts of titanium dioxide
10-20 parts of flatting agent
10-20 parts of crosslinking assistant
0-10 parts of temperature-resistant pigment
0-10 parts of an antioxidant;
the super weather-resistant resin meets the following technical indexes: the acid value is 30-36mgKOH/g, the viscosity is 5000-7000mPa.s/200 ℃, and the glass transition temperature is 65 ℃;
the crosslinking assistant is selected from titanate coupling agent TC-114;
the leveling agent is selected from a cellulose acetate butyrate leveling agent;
the super-weather-resistant resin is Zhanxin CRYLCOAT 4488-0 polyester resin;
the preparation method of the special powder coating for coil steel comprises the following steps:
1) Activation of boron nitride: stirring and mixing the crosslinking assistant and the boron nitride powder according to the formula amount;
2) Mixing the boron nitride powder treated in the step 1), the super weather-resistant resin, the TGIC, the titanium dioxide, the flatting agent, the temperature-resistant pigment and the antioxidant according to the formula amount, and then melting and extruding; tabletting, crushing and pulverizing to obtain the final product.
2. The special powder coating for coil steel according to claim 1, wherein the titanium dioxide is rutile titanium dioxide.
3. The special powder coating for coil steel according to claim 1, wherein the temperature-resistant pigment is selected from manganese iron black.
4. The special powder coating for coil steel according to claim 1, wherein the antioxidant is Basf 1010.
5. The special powder coating for coil steel according to claim 1, wherein in the step 1), the crosslinking assistant and the isopropanol are mixed according to a volume ratio of 1.
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| CN102408550A (en) * | 2011-11-14 | 2012-04-11 | 广州擎天实业有限公司 | Carboxyl-terminated polyester resin for super weather-proof powder coating and preparation method thereof |
| CN103739830B (en) * | 2013-10-21 | 2017-01-11 | 广州擎天材料科技有限公司 | Polyester resin for TGIC cured high-toughness powder coating and preparation method thereof |
| CN105273581B (en) * | 2015-11-06 | 2017-12-22 | 广州擎天材料科技有限公司 | A kind of high IR rapid curing coil powdery paints and preparation method thereof |
| CN105860765A (en) * | 2016-06-08 | 2016-08-17 | 合肥市燕美粉末涂料有限公司 | High-temperature-resistant powder paint and preparation method thereof |
| CN109423170A (en) * | 2017-06-27 | 2019-03-05 | 常州金铠甲高分子复合新材料科技有限公司 | A kind of high temperature resistant, powdery paints of good weatherability and preparation method thereof |
| CN109535947A (en) * | 2017-08-17 | 2019-03-29 | 金晨粉末涂料（江苏）有限公司 | A kind of heat-dissipation powder paint and preparation method thereof |
| CN109971318B (en) * | 2019-03-20 | 2021-04-13 | 擎天材料科技有限公司 | Powder coating for household electrical appliance coiled material and preparation method thereof |
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| 吴宗栓 ; 罗绵生 ; 叶永权 ; 阮德亮 ; .家电用高韧性粉末涂料的研制.涂层与防护.2020,(05),第57-61页. * |
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