CN114316752A - Powder coating composition with stable pearl feel, preparation method thereof and coating - Google Patents
Powder coating composition with stable pearl feel, preparation method thereof and coating Download PDFInfo
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- CN114316752A CN114316752A CN202111590865.4A CN202111590865A CN114316752A CN 114316752 A CN114316752 A CN 114316752A CN 202111590865 A CN202111590865 A CN 202111590865A CN 114316752 A CN114316752 A CN 114316752A
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Abstract
The invention discloses a powder coating composition with stable pearlescent texture, a preparation method thereof and a coating, comprising a basic powder coating composition and a coated pearlescent effect pigment, wherein the coating material adopted by the coated pearlescent effect pigment is transparent resin without a curing agent, the basic powder coating composition comprises thermosetting resin with the weight ratio of not less than 70 wt% and the curing agent for crosslinking and curing the thermosetting resin, and part or all of the coated pearlescent effect pigment is adhered to the basic powder coating composition; after the specific powder coating composition adopting the formula is sprayed and cured, a coating with stable pearlescent texture can be obtained.
Description
Technical Field
The invention belongs to the field of powder coating, and particularly relates to a powder coating composition with stable pearlescent texture, and a preparation method and a coating applied to the powder coating composition.
Background
The thermosetting powder coating has the advantages of environmental protection, low energy consumption, convenient construction, no (at least little) VOC emission and the like, so the thermosetting powder coating is widely used for replacing paint and water-based paint to realize protection and decoration of products in various fields.
In particular, in order to enrich the decorative effect of thermosetting powder coatings and make the decorative effect of thermosetting powder coatings closer to the decorative effect of paint, various effect pigments are added into the thermosetting powder coatings, and the thermosetting powder coatings are mixed with the thermosetting powder coatings in a blending or bonding process mode during preparation. Pearlescent pigments, as one of the effect pigments, are commonly used in powder coating compositions to suffer from poor or unstable pearlescent qualities.
In order to improve the above problems, the invention patent publication No. CN111518419A discloses a modified pearlescent pigment comprising a pearlescent pigment body and a resin matrix layer coated on the surface of the pearlescent pigment body, the resin matrix comprising an aqueous high molecular polymer. The modified pearlescent pigment has good compatibility and dispersibility in a water-based high polymer material system, and shows a better pearlescent effect. The main principle of the patent is that the resin matrix formed by the water-based high molecular polymer is used for coating and improving the pearlescent pigment, and the pearlescent pigment is directly stirred, dry-mixed and mixed with a resin system of the powder coating, so that the dispersion effect of the pearlescent pigment in the coating can be improved, and the pearlescent effect of the coating is further improved. In addition, this technique uses an aqueous compound, which makes it difficult to handle during the manufacture of the powder coating, and therefore the powder coatings each preferably use a solid compound. Furthermore, although resin-coated pearlescent pigments (e.g., binderless pearlescent powders) have been proposed in the prior art, they all believe that these resin-coated modified pearlescent pigments can be directly mixed with thermosetting powder coatings by dry-blending processes to improve the dispersibility of the pearlescent pigment in the powder coating system. However, the applicant finds that the pearlescent texture and the stability of the coating applied by the modified pearlescent pigment still cannot be compared with the pearlescent effect of paint.
Therefore, the applicant wishes to develop a new technical solution to solve the above technical problems.
Disclosure of Invention
In view of the above, the present invention provides a powder coating composition with stable pearlescent texture, a preparation method thereof and a coating layer, wherein the specific powder coating composition adopting the formula can obtain the coating layer with stable pearlescent texture after finishing spraying and curing.
The technical scheme adopted by the invention is as follows:
a powder coating composition with stable pearlescent texture comprises a base powder coating composition and a coated pearlescent effect pigment, wherein a coating material adopted by the coated pearlescent effect pigment is transparent resin without a curing agent, the base powder coating composition comprises thermosetting resin with the weight ratio of not less than 70 wt% and the curing agent for crosslinking and curing the thermosetting resin, and part or all of the coated pearlescent effect pigment is adhered to the base powder coating composition.
Preferably, the D50 particle size of the coated pearlescent effect pigment is in the range of 15-30 μm; and/or the base powder coating composition has a D50 particle size in the range of 20-50 μm.
Preferably, the thermosetting resin accounts for not less than 80 wt% of the weight portion of the base powder coating composition; and/or the transparent resin accounts for 10-70 wt% of the coated pearlescent effect pigment.
Preferably, the viscosity of the thermosetting resin is not higher than 30pa.s at 160 ℃.
Preferably, the thermosetting resin comprises a carboxyl polyester resin having an acid value of not more than 50 mgKOH/g.
Preferably, the coated pearlescent effect pigment comprises a coated mica pearlescent pigment and/or a coated alumina pearlescent pigment and/or a coated silica pearlescent pigment and/or a coated glass pearlescent pigment.
Preferably, the proportion by weight of the coated pearlescent effect pigment in the base powder coating composition is in the range of 0.5-8 wt%.
Preferably, a method of preparing a powder coating composition as described above, comprising the steps of:
s10), melting, mixing and crushing the raw materials of the basic powder coating composition to obtain the basic powder coating composition;
s20), mixing the coated pearlescent effect pigment and the base powder coating composition into a whole through a thermal bonding process in a bonding device.
Preferably, the thermal bonding time in the thermal bonding process does not exceed 2 minutes and/or the thermal bonding temperature ranges from 45 to 50 ℃.
Preferably, the step S20) includes at least one of the following steps:
s21), placing the base powder coating composition in a bonding apparatus in advance;
s22), under an inert gas protective atmosphere, bringing the base powder coating composition to a thermal bonding temperature required for the thermal bonding process by the bonding apparatus;
s23), placing the coated pearlescent effect pigment in bonding equipment, and mixing the coated pearlescent effect pigment and the basic powder coating composition into a whole through a thermal bonding process.
Preferably, the coating with stable pearlescent texture is formed by spraying the powder coating composition on a substrate, and forming after curing reaction.
It should be noted that the acid value detection standard referred to in the present application is in accordance with ISO 3682-1998; the detection standard of the viscosity value is ASTM D4287-1994, and the adopted detection equipment is ICI CONE-PLATE viscometer (CONE & PLATE); the related vitrification temperature data is obtained by detection through a METTLER thermal analyzer, a Differential Scanning Calorimetry (DSC) is adopted as a detection method, and the heating and temperature rising speed parameter is set at 20 ℃/min; the D50 particle size data referred to are D50 data obtained from a particle size distribution test using a Malvern particle size Analyzer 2000.
The application provides a formula resin system which takes high-content thermosetting resin and curing agent with the weight ratio of not less than 70 wt% as a basic powder coating composition, a coating material adopts a specific coating type pearlescent effect pigment of transparent resin (without the curing agent), a specific powder coating composition formula is obtained by bonding the coating type pearlescent effect pigment on the basic powder coating composition, and a coating with stable pearlescent texture can be obtained after the specific powder coating composition adopting the formula is sprayed and cured.
Detailed Description
The embodiment of the application provides a powder coating composition with stable pearlescent texture, which comprises a base powder coating composition and a coated pearlescent effect pigment, wherein a coating material adopted by the coated pearlescent effect pigment is transparent resin without a curing agent, the base powder coating composition comprises thermosetting resin with the weight ratio of not less than 70 wt% and the curing agent for crosslinking and curing the thermosetting resin, and part or all of the coated pearlescent effect pigment is adhered to the base powder coating composition.
Preferably, in order to improve the bonding effect and further obtain more stable pearlescent effect of the coating, in the embodiment, the particle size of the D50 particle of the coated pearlescent effect pigment is 15-30 μm; preferably, in this embodiment, the D50 particle size of the base powder coating composition ranges from 20 to 50 μm; further preferably, in order to improve the adhesion quality of the coated pearlescent effect pigment, in the present embodiment, the particle size of D50 of the base powder coating composition is larger than the particle size of D50 of the coated pearlescent effect pigment.
Preferably, in order to facilitate the coating layer to obtain a stable and reliable pearl feeling, in the present embodiment, the proportion of the thermosetting resin in the base powder coating composition is not less than 80 wt%, more preferably 80 to 95 wt%, and still more preferably 85 to 92 wt%; preferably, in order to facilitate the pearlescent texture glittering and leveling effect of the coating layer, in the present embodiment, the viscosity of the thermosetting resin at 160 ℃ is not higher than 30pa.s, more preferably 10 to 30 pa.s.
In order to reduce the raw material cost and make the material have a prospect of batch application, preferably, in the embodiment, the thermosetting resin is amorphous resin; in terms of resin type, the thermosetting resin in the present embodiment may adopt a known thermosetting resin, and specifically may be one or a mixture of any one of an epoxy resin, a carboxylic acid polyester resin, a hydroxyl polyester resin, an acrylic resin, or a fluorocarbon resin.
Preferably, in the present embodiment, the thermosetting resin includes a carboxyl polyester resin having an acid value of not more than 50mgKOH/g, more preferably 15 to 45mgKOH/g, still more preferably 25 to 40 mgKOH/g; preferably, in the present embodiment, the glass transition temperature of the thermosetting resin is not lower than 50 ℃, more preferably 52 to 65 ℃, and further preferably 55 to 60 ℃. Particularly preferably, in this embodiment, Uralac P838 carboxyl polyester resin from DSM, having an acid number of 24 to 26 mgKOH/g, a viscosity of 22 to 44Pa.s at 160 ℃ and a glass transition temperature of about 56 ℃ is particularly selected, or Uralac P865 carboxyl polyester resin from DSM, having an acid number of 33 to 37mgKOH/g, a viscosity of 33 to 37Pa.s at 160 ℃ and a glass transition temperature of about 56 ℃; other polyester resins having similar preferred characteristics may of course be preferred.
Preferably, in the present embodiment, the curing agent may be any known curing agent selected according to the thermosetting resin actually selected, as long as it is ensured that the curing agent can send a crosslinking curing reaction with the thermosetting resin; specifically, in this embodiment, the curing agent includes hydroxyalkyl amide (also known as Primid) and/or TGIC (triglycidyl isocyanurate) and/or isocyanate compound, and preferably, the isocyanate compound described in this embodiment further includes blocked isocyanate, latent isocyanate, uretdione, and the like; the curing agent may also comprise a mixture of more than one curing compound, for example using two different isocyanate-based compounds. Generally, in this embodiment, the curing agent comprises 2 to 35 weight percent, preferably 3 to 25 weight percent, more preferably 5 to 20 weight percent of the powder coating composition; in an alternative embodiment, the curing agent comprises 1 to 15 wt%, preferably 1 to 10 wt%, more preferably 2 to 6 wt% of the powder coating composition. Of course, in other embodiments, suitable preferred curing agents and/or suitable parts by weight of curing agents may be selected depending on the type of thermosetting resin employed.
Preferably, in this embodiment, the coated pearlescent pigment includes a coated mica pearlescent pigment and/or a coated alumina pearlescent pigment and/or a coated silica pearlescent pigment and/or a coated glass pearlescent pigment, and may further include other known coated pearlescent pigments, which is not specifically limited in this embodiment, and similar stable pearlescent texture coating effect can be obtained. Preferably, in this embodiment, the proportion of the coated pearlescent effect pigment by weight in the base powder coating composition ranges from 0.5 to 8 wt%, more preferably from 0.8 to 6 wt%, and still more preferably from 1 to 5 wt%.
Preferably, in the present embodiment, the ratio of the transparent resin to the coated pearlescent effect pigment is in the range of 10 to 70 wt%, more preferably 20 to 60 wt%, and still more preferably 25 to 50 wt%; preferably, in order to further facilitate the obtaining of the stable pearlescent texture coating effect in the embodiment, the transparent resin may be the same as or different from the thermosetting resin; further specifically, in the present embodiment, the transparent resin may be subjected to a crosslinking reaction with a curing agent for the thermosetting resin; preferably, the crosslinking reaction speed of the transparent resin and the curing agent should be lower than that of the thermosetting resin. Further preferably, in the case where both of the carboxyl type thermosetting resin and the carboxyl type transparent resin are used, the acid value of the transparent resin is not higher than that of the thermosetting resin, and particularly preferably, in the present embodiment, both of the carboxyl type polyester resin is used as the thermosetting resin and/or the transparent resin. Preferably, the transparent resin is a polyester resin, and the acid value thereof is not higher than 30 mgKOH/g, more preferably not higher than 20 mgKOH/g. For example, in the present embodiment, a low acid value polyester resin having an acid value of 15 to 20mgKOH/g can be preferably used as the transparent resin. Preferably, in the present embodiment, the difference in acid value between the thermosetting resin and the transparent resin is at least 5mgKOH/g, more preferably at least 10mgKOH/g, wherein the thermosetting resin has a higher acid value. In certain embodiments, a first curing agent for curing the thermosetting resin and a second curing agent for curing the transparent resin may also be provided, wherein the first curing agent and the second curing agent may be the same or different from each other.
The thermosetting resin, the curing agent and the coated pearlescent effect pigment can be directly purchased in the market, and the raw material sources are easy to obtain.
Preferably, in the practice of the present application, the addition of well-known leveling, degassing, antioxidant, dispersing, pigment, filler, stabilizer, flow agent, wax or other auxiliary agents, and the like, to the base powder coating composition, may also be selected by those of ordinary skill in the art. In order to facilitate obtaining a coating effect of stable pearl feeling, the base powder coating composition in the present embodiment is preferably not additionally added with a filler. The base powder coating composition of the present invention can be prepared by a known process such as mixing raw materials, melt extrusion, and crushing, but it is needless to say that the base powder coating composition of the present example can be obtained by another known preparation process, and the preparation process is not particularly limited in the present application.
Preferably, this embodiment also provides a method for preparing the above powder coating composition, comprising the following steps:
s10), melting, mixing and crushing the raw materials of the basic powder coating composition to obtain the basic powder coating composition;
s20), mixing the coated pearlescent effect pigment and the basic powder coating composition into a whole in bonding equipment through a thermal bonding process; preferably, in the step S20), at least the following steps are included:
s21), placing the base powder coating composition in a bonding apparatus in advance;
s22), under the protection of inert gas, leading the basic powder coating composition to reach the thermal bonding temperature required by the thermal bonding process through bonding equipment;
s23), placing the coated pearlescent effect pigment in bonding equipment, and mixing the coated pearlescent effect pigment and the basic powder coating composition into a whole through a hot bonding process; preferably, in the present embodiment, the thermal bonding time in the thermal bonding process is not more than 2 minutes, more preferably 0.5 to 1.5 minutes; and/or the thermal bonding temperature is in the range of 45-70 deg.C, preferably 45-60 deg.C, more preferably 45-55 deg.C, and most preferably 45-50 deg.C.
The embodiment of the application also provides a coating with stable pearlescent texture, wherein the powder coating composition with stable pearlescent texture is sprayed on a substrate, and the coating with stable pearlescent texture is obtained after curing reaction and molding; particularly preferably, in the present embodiment, the substrate is a metal substrate, preferably an aluminum substrate or a ferrous substrate. The coating with stable pearlescent texture in the embodiment can be specifically selected according to actual needs, and the suggested coating thickness range is 60-120 μm (the test standard is ISO 2360-.
In order to verify the technical effects of the application, the following examples were specifically conducted as raw materials for the formulation of a powder coating composition with stable pearlescent texture to compare the specific test performances:
example 1: a powder coating composition with stable pearlescent texture comprises a base powder coating composition and 2.5 wt% of coated pearlescent effect pigment in parts by weight of the base powder coating composition, and is prepared by the preparation method; wherein the hot bonding time in the hot bonding process is 1 minute, and the hot bonding temperature is set at 48 ℃; the coated pearlescent effect pigment adopts NB bonding-free pearlescent powder (coated by transparent polyester resin) from Shanghai Dynasty; the base powder coating compositions were prepared as set forth in table 1 below:
TABLE 1 formulation Table for the base powder coating composition of this example 1
Example 2: the remaining technical solutions of this embodiment 2 are different from those of embodiment 1 only in that: in this example 2, a base powder coating composition was prepared as set forth in Table 2 below:
table 2 formulation of the base powder coating composition of this example 2
Example 3: the remaining technical solutions of this embodiment 3 are different from those of embodiment 1 only in that: in this example 3, a base powder coating composition was prepared as set forth in Table 3 below:
table 3 formulation of the base powder coating composition of this example 3
Example 4: the remaining technical solutions of this embodiment 4 are different from those of embodiment 1 only in that: in this example 4, a base powder coating composition was prepared as set forth in Table 4 below:
table 4 formulation of the base powder coating composition of this example 4
Example 5: the remaining technical solutions of this embodiment 5 are different from those of embodiment 1 only in that: in this example 5, a base powder coating composition was prepared as set forth in Table 5 below:
TABLE 5 formulation table for base powder coating composition of this example 5
Example 6: the remaining technical solutions of this embodiment 6 are different from those of embodiment 1 only in that: in this example 6, a base powder coating composition was prepared as set forth in Table 6 below:
table 6 formulation of the base powder coating composition of this example 6
Example 7: the remaining technical solutions of this embodiment 7 are different from those of embodiment 1 only in that: in this example 7, a base powder coating composition was prepared as set forth in Table 7 below:
table 7 formulation of the base powder coating composition of this example 7
Example 8: the remaining technical solutions of this embodiment 8 are different from those of embodiment 1 only in that: in this example 8, a base powder coating composition was prepared as set forth in Table 8 below:
table 8 formulation of the base powder coating composition of this example 8
Example 9: the remaining technical solutions of this embodiment 9 are different from those of embodiment 1 only in that: this example 9 provides a powder coating composition having a stable pearlescent feel comprising a base powder coating composition and 1 wt% of an encapsulated pearlescent effect pigment based on the weight of the base powder coating composition.
Example 10: the remaining technical solutions of this embodiment 10 are different from those of embodiment 1 only in that: this example 10 provides a powder coating composition with stable pearlescent feel comprising a base powder coating composition and 3 wt% of an encapsulated pearlescent effect pigment based on the weight of the base powder coating composition.
Example 11: the remaining technical solutions of this embodiment 11 are different from those of embodiment 1 only in that: this example 11 provides a powder coating composition having a stable pearlescent feel comprising a base powder coating composition and 4 wt% of an encapsulated pearlescent effect pigment based on the weight of the base powder coating composition.
Example 12: the remaining technical solutions of this embodiment 12 are different from those of embodiment 1 only in that: this example 12 provides a powder coating composition having a stable pearlescent feel comprising a base powder coating composition and 6 wt% of an encapsulated pearlescent effect pigment based on the weight of the base powder coating composition.
Example 13: the remaining technical solutions of this embodiment 13 are different from those of embodiment 1 only in that: this example 13 provides a powder coating composition having a stable pearlescent feel comprising a base powder coating composition and 0.8 wt% of an encapsulated pearlescent effect pigment based on the weight of the base powder coating composition.
Example 14: the remaining technical solutions of this embodiment 14 are different from those of embodiment 1 only in that: this example 14 provides a powder coating composition having a stable pearlescent feel comprising a base powder coating composition and 0.5 wt% of an encapsulated pearlescent effect pigment based on the weight of the base powder coating composition.
Example 15: the remaining technical solutions of this embodiment 15 are different from those of embodiment 1 only in that: this example 15 provides a powder coating composition having a stable pearlescent feel comprising a base powder coating composition and 0.3 wt% of an encapsulated pearlescent effect pigment based on the weight of the base powder coating composition.
Example 16: the remaining technical solutions of this embodiment 16 are different from those of embodiment 1 only in that: in this example 16, the thermal bonding time in the thermal bonding process was 0.5 minutes, and the thermal bonding temperature was 50 ℃.
Example 17: the remaining technical solutions of this embodiment 17 are different from those of embodiment 1 only in that: in this example 17, the thermal bonding time in the thermal bonding process was 2 minutes, and the thermal bonding temperature was 45 ℃.
Example 18: the remaining technical solutions of this embodiment 18 are different from those of embodiment 1 only in that: in this example 18, the thermal bonding time in the thermal bonding process was 1.5 minutes, and the thermal bonding temperature was 53 ℃.
Example 19: the remaining technical solutions of this embodiment 19 are different from those of embodiment 1 only in that: in this example 19, the thermal bonding time in the thermal bonding process was 3 minutes.
Example 20: the remaining technical solutions of this embodiment 20 are different from those of embodiment 1 only in that: in this example 20, the thermal bonding time in the thermal bonding process was 2.5 minutes.
Example 21: the remaining technical solutions of this embodiment 21 are different from those of embodiment 1 only in that: in this example 21, the transparent resin in the coated pearlescent effect pigment is transparent high acid value polyester resin, wherein the transparent high acid value polyester resin is specifically selected from S from sainshiJT372 carboxyl polyester resin, its acid value range is 66-75mgKOH/g, viscosity range is 1500-4500mPa.s at 200 deg.C, softening point temperature is 100-110 deg.C, glass transition temperature is about 53 deg.C. Specifically, in this example 21, when preparing the coated pearlescent effect pigment, all the raw materials of the transparent resin can be put into an internal mixer with stirring and heating functions, and after the transparent resin is in a molten state, a predetermined weight part of the pearlescent effect pigment (specifically, the pearlescent effect pigment from MERCK is selected) is added into the internal mixer
T20-01 WNT), crushing/grinding the coated particles after banburying mixing, and obtaining the coated pearlescent effect pigment of the embodiment 21. Naturally, other types of pearlescent effect pigments can be optionally added, the pearlescent effect pigments can be pre-coated or not, and the application does not limit the pearlescent effect pigments at all).
Example 22: the remaining technical solutions of this embodiment 22 are different from those of embodiment 1 only in that: in this example 22, the coated pearlescent effect pigment used was the modified pearlescent pigment disclosed in CN 111518419A.
Example 23: the remaining technical solutions of this embodiment 23 are different from those of embodiment 1 only in that: in this example 23, the thermosetting resin used was a carboxyl polyester resin with high acid value, wherein the thermosetting resin was SJT372 carboxyl polyester resin from Shenjian, the acid value ranged from 66 to 75mgKOH/g, the viscosity ranged from 1500-.
Example 24: the remaining technical solutions of this embodiment 24 are different from those of embodiment 1 only in that: in this example 24, the thermosetting resin used was a high-viscosity carboxyl polyester resin, and the high-viscosity polyester resin was specifically SJ4867 polyester resin (acid value 29-35mgKOH/g, viscosity at 200 ℃ 5.5-7.5Pa.s) from Shenjian.
Example 25: the remaining technical solutions of this embodiment 25 are different from those of embodiment 1 only in that: in this example 25, the thermal bonding temperature in the thermal bonding process was 55 ℃.
Example 26: the remaining technical solutions of this embodiment 26 are different from those of embodiment 1 only in that: in this example 26, the thermal bonding temperature in the thermal bonding process was 60 ℃.
Example 27: the remaining technical solutions of this embodiment 27 are different from those of embodiment 1 only in that: in this example 27, the thermal bonding temperature in the thermal bonding process was 65 ℃.
Example 28: the remaining technical solutions of this embodiment 28 are different from those of embodiment 1 only in that: in this example 28, the thermal bonding temperature in the thermal bonding process was 70 ℃.
Example 29: the remaining technical solutions of this embodiment 29 are different from those of embodiment 1 only in that: in this example 29, the thermal bonding time in the thermal bonding process was 5 minutes.
Example 30: the remaining technical solutions of this embodiment 30 are different from those of embodiment 1 only in that: in this example 30, a base powder coating composition was prepared as set forth in Table 9 below:
TABLE 9 formulation table for the base powder coating composition of this example 30
Example 31: the remaining technical solutions of this embodiment 31 are different from those of embodiment 1 only in that: in this example 31, a base powder coating composition was prepared as set forth in Table 10 below:
table 10 formulation of the base powder coating composition of this example 31
Comparative example 1: the rest of the technical scheme of the comparative example 1 is different from the embodiment 1 only in that: in the present comparative example 1,the weight portion of polyester resin used in the base powder coating composition of example 1 was reduced to 650 parts by adding 300 parts TiO2A filler to hold 1000 parts by weight of the base powder coating composition.
Comparative example 2: the rest of the technical scheme of the comparative example 2 is different from the embodiment 1 only in that: in this comparative example 2, the base powder coating composition and the coated pearlescent effect pigment were mixed together by a dry blending process.
Comparative example 3: the other technical scheme of the comparative example 3 is the same as that of the example 1, and the difference is only that: in this comparative example 3, the transparent resin in the coated pearlescent effect pigment used comprises 95 wt% of Uralac P865 polyester resin and 5 wt% of TGIC curing agent.
Comparative example 4: the other technical scheme of the comparative example 4 is the same as that of the example 1, and the difference is only that: in this comparative example 4, a conventional pearlescent pigment (which was not subjected to coating modification) was used instead of the coated pearlescent effect pigment used in example 1.
The powder coating compositions prepared in the above examples 1-24 and comparative examples 1-4 were sprayed on aluminum substrates of the same type and cured (curing conditions were selected uniformly at 180 ℃ @15min) to obtain cured coatings with a film thickness of 60-100 μm. The present application performs a comparison of the performance tests shown in table 11 below for each cured coating:
table 11 comparative table of performance tests of examples and comparative examples of the present application
The application further performs a batch stability test on example 1, specifically performs 5 batches (100 kg per batch) of trial production on the powder coating composition with stable pearl feeling provided in example 1, and performs spraying and curing on the aluminum substrate with the same model as above (the curing conditions are uniformly selected to be 180 ℃ @15min) to obtain a 1# batch of cured coating, a 2# batch of cured coating, a 3# batch of cured coating, a 4# batch of cured coating and a 5# batch of cured coating, wherein the film thickness of each batch of cured coating is controlled to be 60-100 μm. Through detection, all batches of cured coatings have the same or basically the same pearlescent flickering texture effect, and can not be distinguished visually.
The coatings obtained in the comparative examples 2 and 3 have poor pearlescent glittering texture effect, and the pearlescent effects of the coatings in different batches are greatly different, so that the coatings can be obviously distinguished visually.
Example 1 was further tested for chemical resistance, and the results are shown in table 12 below:
table 12 comparative table of chemical resistance test of example 1 of the present application
It should be noted that the performance test related to this example is performed according to the test standards or conditions described in the following table 13.
TABLE 13 test items and test criteria or conditions
Through a number of comparative tests, the applicant suggests that the present application is preferably practiced without adding fillers to the base powder coating composition, which would significantly affect the targeted effect of the coating in the present application; it is preferable to use a transparent resin which can undergo a slow crosslinking curing reaction with the curing agent in the powder coating composition and does not contain a curing agent itself as a coating material for the coated pearlescent effect pigment; the hot bonding time in the hot bonding process is not more than 2 minutes, and/or the hot bonding temperature is not more than 50 ℃, so that the coating can obtain more excellent and stable pearlescent glittering texture effect, and the coating can be completely used as an environment-friendly substitute product of the pearlescent effect obtained by coating multi-layer paint.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (11)
1. A powder coating composition with stable pearlescent texture is characterized by comprising a base powder coating composition and a coated pearlescent effect pigment, wherein a coating material adopted by the coated pearlescent effect pigment is transparent resin without a curing agent, the base powder coating composition comprises thermosetting resin with the weight ratio of not less than 70 wt% and the curing agent for crosslinking and curing the thermosetting resin, and part or all of the coated pearlescent effect pigment is adhered to the base powder coating composition.
2. The powder coating composition of claim 1, wherein the coated pearlescent effect pigment has a D50 particle size in the range of 15-30 μ ι η; and/or the base powder coating composition has a D50 particle size in the range of 20-50 μm.
3. A powder coating composition according to claim 1, wherein the thermosetting resin comprises not less than 80 wt% of the base powder coating composition; and/or the transparent resin accounts for 10-70 wt% of the coated pearlescent effect pigment.
4. A powder coating composition according to claim 1, wherein the viscosity of the thermosetting resin is not higher than 30pa.s at 160 ℃.
5. A powder coating composition as recited in claim 1, wherein the thermosetting resin comprises a carboxyl polyester resin having an acid number of no greater than 50 mgKOH/g.
6. A powder coating composition according to claim 1, wherein the coated pearlescent effect pigment comprises a coated mica pearlescent pigment and/or a coated alumina pearlescent pigment and/or a coated silica pearlescent pigment and/or a coated glass pearlescent pigment.
7. A powder coating composition as claimed in claim 1, wherein the proportion by weight of the coated pearlescent effect pigment in the base powder coating composition is in the range of 0.5-8 wt%.
8. A process for the preparation of a powder coating composition according to any one of claims 1 to 7, comprising the steps of:
s10), melting, mixing and crushing the raw materials of the basic powder coating composition to obtain the basic powder coating composition;
s20), mixing the coated pearlescent effect pigment and the base powder coating composition into a whole through a thermal bonding process in a bonding device.
9. A powder coating composition according to claim 8, wherein the hot bonding process is carried out for a hot bonding time of not more than 2 minutes and/or at a hot bonding temperature in the range of 45-70 ℃.
10. The powder coating composition of claim 8, wherein step S20) comprises at least one of the following steps:
s21), placing the base powder coating composition in a bonding apparatus in advance;
s22), under an inert gas protective atmosphere, bringing the base powder coating composition to a thermal bonding temperature required for the thermal bonding process by the bonding apparatus;
s23), placing the coated pearlescent effect pigment in bonding equipment, and mixing the coated pearlescent effect pigment and the basic powder coating composition into a whole through a thermal bonding process.
11. A coating having a stable pearlescent texture, characterized in that the powder coating composition according to any one of claims 1 to 7 is sprayed on a substrate and, after curing reaction, shaped to give a coating having a stable pearlescent texture.
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| CN202111590865.4A CN114316752B (en) | 2021-12-23 | 2021-12-23 | Powder coating composition with stable pearlescent texture, preparation method and coating thereof |
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| CN202111590865.4A CN114316752B (en) | 2021-12-23 | 2021-12-23 | Powder coating composition with stable pearlescent texture, preparation method and coating thereof |
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