CN103642290A - Preparation method of metal-effect powder paint - Google Patents
Preparation method of metal-effect powder paint Download PDFInfo
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- CN103642290A CN103642290A CN201310616139.4A CN201310616139A CN103642290A CN 103642290 A CN103642290 A CN 103642290A CN 201310616139 A CN201310616139 A CN 201310616139A CN 103642290 A CN103642290 A CN 103642290A
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Abstract
The invention discloses a preparation method of metal-effect powder paint. The method comprises the following steps: based on a hot-mixing process, selecting and adding a special additive and powder paint body powder into a hot-mixing cylinder, stirring and heating to the temperature 2 DEG C-10 DEG C above the Tg of body powder, and adding metal pigment and paint body powder for stirring and mixing together; and then, preparing the metal-effect powder paint by cold-mixing and sieving. In a hot-mixing process, the special additive can be directly acted on body powder particles, so that an agglomeration phenomenon among the body powder particles is improved. Besides, the special additive is added and the hot-mixing temperature can be further properly increased, so that the body powder particles can be more softened and not easy to agglomerate with each other, and the metal pigment particles are uniformly bonded on the surfaces of the softened body powder particles easier, and therefore, bonding efficiency is improved, and the uniformly bonded metal pigment and body powder are uniformly adsorbed on a substrate easier, and an uniform coating with a strong metal effect can be obtained. The process is suitable for the metal-effect powder paint of systems such as epoxy/polyester, polyester/TGIC (Triglycidyl Isocyanurate), plyester/hydroxyalkyl amide, and the like.
Description
Technical field
The present invention relates to a kind of powder coating new preparation process, be specifically related to a kind of metal effect powder coating new preparation process that has.
Background technology
Powder coating, as a kind of environment friendly coated package material not dividing containing solvent evaporates completely, more and more obtains global extensive approval.Meanwhile, pursue height aesthetic feeling, the especially color of coating and the aesthetic feeling of effect, just becoming a kind of trend.Therefore,, in order to meet environmental protection and application demand attractive in appearance simultaneously, metal effect powder coating technology is arisen at the historic moment.
The manufacturing process that metal current effect powder coating adopts mainly contains three kinds of the mixed methods of melting mixing method, dry mix and heat.Melting mixing method is that metallic pigment and other components are together mixed by forcing machine mixing extrusion, after grinding, sieving, obtain metal effect powder coating, the shortcoming of the method is: in mixing extrusion and attrition process, the sheet structure of metallic pigment can be destroyed, when forming coating, metallic pigment are arranged weak effect, do not reach required metal effect.Dry mix be by end powder and metallic pigment be dry mixed at normal temperatures, sieving obtains metal effect powder coating, the shortcoming of the method is: between the end powder under normal temperature and metallic pigment particle, can not effectively be combined into integral body, in spraying process, fail the metallic pigment of effective combination and end powder after spray gun ejection, because of suffered electrical forces different easily separated, make metallic pigment on ground, evenly not adsorb or to be easily gathered in the muzzle position that strength of electric field is larger, finally cause the inhomogeneous or spraying difficulty of the metal effect of coating.The mixed method of heat is under heating condition, to make metallic pigment mix with powder at the bottom of powder coating, then cooling, metal effect powder coating sieves to obtain.Heating object is to improve adhesive attraction between end powder and metallic pigment, makes to be combined more firm with metallic pigment particle after end powder deliquescing.The metal effect powder coating that this method makes metallic pigment in spraying process are combined firmly with end powder, not easily separated, and can realize both and evenly go up powder according to proportioning, form the coating of homogeneous.The shortcoming of this method is: degree of heat is inadequate, and end powder can not be fully softening, causes metallic pigment deposit efficiency on end powder low, is still difficult to reach better metallic coating effect; Be heated to the end powder when fully softening, easy caking between end powder, metallic pigment equally cannot be effectively evenly bonding, and the end powder after caking is difficult to sieve, and causes operational difficulty and yield rate low.
Summary of the invention
For addressing the above problem, the invention discloses a kind of preparation method of metal effect powder coating, solved the shortcoming and defect part in traditional method application, improved the using value of metal effect powder coating.
A kind of preparation method of metal effect powder coating is on the mixed technique of heat basis, select special additive to join the mixed cylinder of heat together with powder at the bottom of powder coating, stirring is warmed up to after above 2-10 ℃ of end powder Tg, adds metallic pigment heat of stirring together with powder at the bottom of coating to mix.And then make metal effect powder coating through cold after mixing, sieving.In hot mixing process, special additive can directly act on end powder, improves the interparticle caking phenomenon of end powder.In addition, due to adding of special additive, can also suitably improve the mixed temperature of heat, make end powder more softening but difficult mutually coalescent, metallic pigment particle is more easily evenly bonded in softening powder particles surface, the end, thereby improved bonding efficiency, the metallic pigment after evenly bonding are easier to evenly adsorb on ground with end powder, finally can obtain the coating with strong metal effect of homogeneous.This technique is applicable to the metal effect powder coating of the systems such as epoxy/polyester, polyester/TGIC, polyester/hydroxyalkyl amide.
A preparation method for metal effect powder coating, specific embodiment is as follows:
(1) end powder preparation: press powder coating formula by after the even mixing of other components except metallic pigment, add melting mixing machine, at 90 ~ 130 ℃, keep screw speed at 2000 ~ 4000rpm, melting mixing, extrude, compressing tablet, pulverize and sieve after cooling, make powder at the bottom of powder coating;
(2) heat is mixed: special additive of the present invention is added together with end powder in the mixed cylinder of heat.Under high-speed stirring, be warming up to the above 2-10 ℃ of end powder Tg, then add metallic pigment, suitably reduce stirring velocity, insulation low rate mixing mixing certain hour;
(3) cold mixing: the mixture in the mixed cylinder of heat is moved to cold mixed cylinder, and cooling limit, limit low rate mixing, until mixture temperature is down to 20 ℃ of left and right;
(4) sieve: cooled mixture is crossed to 160 ~ 200 mesh sieves, obtain metal effect powder coating.
Special additive described in the present invention is: a kind of in the polyethylene wax of synthetic polyethylene waxes, hydrogenated castor oil, Poly Propylene Wax and acid amides modification.The polyethylene wax of preferred hydrogenated castor oil or acid amides modification; Described special additive is fine powder type, DV
90< 80 μ m; The mixed temperature of described heat is above 2 ~ 10 ℃ of end powder second-order transition temperature (Tg).
Embodiment
Following examples do not form the restriction to invention.
End powder is selected, and indoor, outdoor two types of powder coating are proved.
End powder is made: press in table 1 after formula evenly mixes each component, at 110 ℃, keep screw speed at 2500rpm, melting mixing, extrude, compressing tablet, cooling rear pulverizing, 180 mesh sieves, obtain powder at the bottom of the powder coating of different ingredients.At the bottom of employing differential scanning calorimeter mensuration gained, the second-order transition temperature (Tg) of powder, the results are shown in Table 1.
The melting mixing machine that melting mixing extrusion adopts can be twin screw or single-screw intermixing extruder.The present embodiment adopts the SLJ-30A testing laboratory twin screw extruder of east, Yantai brightness powder equipment company limited.
Table 1
| Formula constituent | Formula 1 | Formula 2 |
| SJ4ET（g） | / | 558 |
| E-12（g） | 300 | / |
| SJ3B（g） | 300 | / |
| TGIC（g） | / | 42 |
| PV-88（g） | 10 | 10 |
| St-yrax (g) | 3 | 3 |
| Titanium dioxide r902 (g) | 150 | 150 |
| Carbon black (g) | 3 | 3 |
| Barium sulfate W5HB(g) | 234 | 234 |
| Add up to (g) | 1000 | 1000 |
| Second-order transition temperature, Tg(℃) | 51 | 49 |
Remarks: 1, SJ4ET: outdoor type TGIC curing polyester resin, acid number is 29-34mgKOH/g, Anhui Shenjian New Material Co.Ltd's product.
2, E-12: bisphenol A type epoxy resin, oxirane value 0.115-0.130 mol/100 gram.
3, SJ3B: polyester carboxylate, acid number is 68-75mgKOH/g, Anhui Shenjian New Material Co.Ltd's product.
4, the polyacrylate flow agent that PV88:Worlee company produces.
5, W5HB: Guizhou China adds the barium sulfate that meticulous mining industry company limited produces.
6, R902: the Rutile type Titanium Dioxide that E.I.Du Pont Company produces.
Heat is mixed: the special additive described in table 2 is added together with end powder in the mixed cylinder of heat and (adopt the SHTXing nation of Xiamen San Hetai Science and Technology Ltd. to determine machine), stirring is warming up to the mixed temperature of heat described in table 2, add metallic pigment, constant temperature low rate mixing 25-35min.
Cold mixing: the mixture after heat is mixed is transferred in cold mixed cylinder and (adopts the SHTXing nation of Xiamen San Hetai Science and Technology Ltd. to determine machine), and cooling limit, limit low rate mixing, until mixture temperature is down to below 20 ℃.
Sieve: cooled composition is crossed to 180 mesh sieves, obtain metal effect powder coating.
The metal effect powder coating that formula by table 2 and treatment process are obtained, upper at Q-panel model (0.5 * 70 * 100 mm) with the electrostatic spraying of corona spray gun, then at 190 ℃, toast 15min and solidify, obtain the powder with metal effect and film.
Film performance evaluation method
Silver mirror effect adopts meets profile and the sharpness judgement that light is observed imaging; Dodging silver-colored effect adopts and meets light and observe the dense degree of dodging silver point on model and judge.Coating film gloss degree adopts under 60 ° of BYK AG-4450 type glossometers and detects.
Table 2
Remarks: the hydrogenated castor oil that 1, special additive 1:CRAYVALLY company produces, the trade mark is CRAYVALLAC PC, fusing point is 83 ~ 88 ℃, DV
90=20 μ m.
The polyethylene wax of the acid amides modification that 2, special additive 2:Clariant company produces, the trade mark is Ceridust 9615 A, approximately 140 ℃ of fusing points, DV
90=15 μ m.
Gloss and the metal effect of indoor, the outdoor metal effect powder coating that as can be seen from Table 2, employing processing method of the present invention makes are all better than the metal effect powder coating that traditional technology makes.
More than show and described ultimate principle of the present invention, principal character and advantage of the present invention.Those skilled in the art should understand the present invention and not be restricted to the described embodiments; that in above-described embodiment and specification sheets, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in claimed scope.
Claims (2)
1. a preparation method for metal effect powder coating, is characterized in that, specific embodiment is as follows:
(1) end powder preparation: press powder coating formula by after the even mixing of other components except metallic pigment, add melting mixing machine, at 90 ~ 130 ℃, keep screw speed at 2000 ~ 4000rpm, melting mixing, extrude, compressing tablet, pulverize and sieve after cooling, make powder at the bottom of powder coating;
(2) heat is mixed: special additive of the present invention is added together with end powder in the mixed cylinder of heat, be warming up to powder Tg above 2-10 ℃ in the end under high-speed stirring, then add metallic pigment, suitably reduce stirring velocity, insulation low rate mixing mixing certain hour;
(3) cold mixing: the mixture in the mixed cylinder of heat is moved to cold mixed cylinder, and cooling limit, limit low rate mixing, until mixture temperature is down to 20 ℃ of left and right;
(4) sieve: cooled mixture is crossed to 160 ~ 200 mesh sieves, obtain metal effect powder coating.
2. the preparation method of a kind of metal effect powder coating according to claim 1, is characterized in that: described special additive is: a kind of in the polyethylene wax of synthetic polyethylene waxes, hydrogenated castor oil, Poly Propylene Wax and acid amides modification; The polyethylene wax of preferred hydrogenated castor oil or acid amides modification; Described special additive is fine powder type, DV
90< 80 μ m; The mixed temperature of described heat is above 2 ~ 10 ℃ of end powder second-order transition temperature (Tg).
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105602419A (en) * | 2016-02-22 | 2016-05-25 | 福建万安实业有限公司 | Artistic powder coating with stripe effect and preparation method thereof |
| CN107722752A (en) * | 2017-09-22 | 2018-02-23 | 安徽桑瑞泰粉末材料有限公司 | The manufacture method of three-dimensional metal effect powdery paints |
| CN108373765A (en) * | 2018-02-06 | 2018-08-07 | 佛山市南海嘉多彩粉末涂料有限公司 | A kind of bonding metal-effect powder paint |
| CN108641560A (en) * | 2018-04-27 | 2018-10-12 | 江门市力昌新材料有限公司 | A kind of high metal pigment content zero diopter powdery paints and preparation method thereof |
| CN112724798A (en) * | 2020-12-16 | 2021-04-30 | 艾勒可新材料(佛山)有限公司 | Powder coating with metal effect and preparation method thereof |
| WO2021103988A1 (en) * | 2019-11-28 | 2021-06-03 | 老虎表面技术新材料（苏州）有限公司 | Powdery primer-and-intermediate-in-one coating for wheel hub use, primer-and-intermediate-in-one coating layer thereof and automobile wheel hub |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105602419A (en) * | 2016-02-22 | 2016-05-25 | 福建万安实业有限公司 | Artistic powder coating with stripe effect and preparation method thereof |
| CN107722752A (en) * | 2017-09-22 | 2018-02-23 | 安徽桑瑞泰粉末材料有限公司 | The manufacture method of three-dimensional metal effect powdery paints |
| CN108373765A (en) * | 2018-02-06 | 2018-08-07 | 佛山市南海嘉多彩粉末涂料有限公司 | A kind of bonding metal-effect powder paint |
| CN108641560A (en) * | 2018-04-27 | 2018-10-12 | 江门市力昌新材料有限公司 | A kind of high metal pigment content zero diopter powdery paints and preparation method thereof |
| WO2021103988A1 (en) * | 2019-11-28 | 2021-06-03 | 老虎表面技术新材料（苏州）有限公司 | Powdery primer-and-intermediate-in-one coating for wheel hub use, primer-and-intermediate-in-one coating layer thereof and automobile wheel hub |
| CN112724798A (en) * | 2020-12-16 | 2021-04-30 | 艾勒可新材料(佛山)有限公司 | Powder coating with metal effect and preparation method thereof |
| CN112724798B (en) * | 2020-12-16 | 2022-04-05 | 艾勒可新材料(佛山)有限公司 | Powder coating with metal effect and preparation method thereof |
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Application publication date: 20140319 |