WO2021103988A1 - Powdery primer-and-intermediate-in-one coating for wheel hub use, primer-and-intermediate-in-one coating layer thereof and automobile wheel hub - Google Patents

Powdery primer-and-intermediate-in-one coating for wheel hub use, primer-and-intermediate-in-one coating layer thereof and automobile wheel hub Download PDF

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Publication number
WO2021103988A1
WO2021103988A1 PCT/CN2020/127329 CN2020127329W WO2021103988A1 WO 2021103988 A1 WO2021103988 A1 WO 2021103988A1 CN 2020127329 W CN2020127329 W CN 2020127329W WO 2021103988 A1 WO2021103988 A1 WO 2021103988A1
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Prior art keywords
coating
powder coating
hub
effect
transparent
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PCT/CN2020/127329
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French (fr)
Chinese (zh)
Inventor
汪志成
糜震宇
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老虎表面技术新材料（苏州）有限公司
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Publication of WO2021103988A1 publication Critical patent/WO2021103988A1/en

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B7/00—Wheel cover discs, rings, or the like, for ornamenting, protecting, venting, or obscuring, wholly or in part, the wheel body, rim, hub, or tyre sidewall, e.g. wheel cover discs, wheel cover discs with cooling fins
    • B60B7/0026—Wheel cover discs, rings, or the like, for ornamenting, protecting, venting, or obscuring, wholly or in part, the wheel body, rim, hub, or tyre sidewall, e.g. wheel cover discs, wheel cover discs with cooling fins characterised by the surface
    • B60B7/0033—Wheel cover discs, rings, or the like, for ornamenting, protecting, venting, or obscuring, wholly or in part, the wheel body, rim, hub, or tyre sidewall, e.g. wheel cover discs, wheel cover discs with cooling fins characterised by the surface the dominant aspect being the surface appearance
    • B60B7/0046—Wheel cover discs, rings, or the like, for ornamenting, protecting, venting, or obscuring, wholly or in part, the wheel body, rim, hub, or tyre sidewall, e.g. wheel cover discs, wheel cover discs with cooling fins characterised by the surface the dominant aspect being the surface appearance the surface being plated or coated
    • 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
    • C09D5/035—Coloring agents, e.g. pigments
    • 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
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
    • 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
    • C09D7/60—Additives non-macromolecular
    • C09D7/63—Additives non-macromolecular organic
    • 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
    • C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
    • C08K2003/3045—Sulfates

Definitions

  • the invention belongs to the field of thermosetting powder coatings, and specifically relates to a powder coating for hub bottom in one.
  • the invention also relates to a bottom and center coating applied by the powder coating and an automobile wheel hub.
  • the car wheel 11 with transparent acrylic powder overcoat usually uses powder coating to cure the base coat 12 (the thickness is usually 80-130 microns) + spray paint (the thickness is usually 10 -30 microns) as the intermediate paint effect layer 13, and finally sprayed with transparent powder (the thickness is usually 80-120 microns) as the overcoat layer 14.
  • the intermediate paint effect layer 13 is not only used as a decorative effect layer, but also needs to be combined with the powder curing primer The adhesion between the layer and the overcoat layer is good.
  • the use of the intermediate paint effect layer 13 will have environmental protection problems, serious pollution, and a complicated coating process.
  • the invention patent with publication number CN107892865A discloses a special primer coating for silver electroplating on the underside of automobile aluminum wheels, which is specifically a polyester-epoxy hybrid system, which is mainly composed of the following components in parts by mass Composition: Saturated carboxyl polyester resin: 100 ⁇ 120, epoxy resin 50 ⁇ 80, additives 0.1 ⁇ 10; in order to achieve the effect of metallic paint, the polyester-epoxy hybrid system is used as the base powder, bonding floating aluminum silver powder Realize the integrated painting of the bottom and the center of the car wheel.
  • the technical solution adopts the polyester-epoxy hybrid system not only cannot reliably meet the stone-strike resistance of higher grades (not lower than 8), but also has poor weather resistance.
  • the technical solution uses bonding metal silver powder.
  • the surface of the coating film of this technology is not suitable for further providing a transparent overcoat layer, the adhesion between the two is poor, and it further directly affects the leveling effect of the overcoat. Therefore, using the powder coating provided by CN107892865A directly as the bottom-in-one coating powder of automobile wheels is a technical solution that cannot be truly promoted and applied in the industry.
  • the purpose of the present invention is to provide a powder coating for the bottom of the hub, its bottom coating, and automobile wheels, which directly replace the existing technology by proposing an innovative single coating solution for curing and molding of powder coatings.
  • the present invention can achieve a good surface coating decoration effect at the same time on the premise of meeting the requirements of automobile wheel detection standards.
  • An all-in-one powder coating for wheel hub bottoms comprising a base powder coating and an effect powder coating that are mixed as a whole, wherein the base powder coating includes a polyester resin whose acid value is not higher than 60 mgKOH/g and used for the Polyester resin cured hydroxyalkylamide, the effect powder coating includes an effect pigment, and at least part of the effect pigment is coated with a transparent powder coating.
  • the base powder coating and the effect powder coating are mixed by dry mixing.
  • the base powder coating and the effect powder coating are mixed by melting.
  • the base powder coating accounts for no less than 50% by weight of the all-in-one powder coating in the hub bottom, and the effect powder coating accounts for no less than 50% by weight of the all-in-one powder coating in the hub bottom. 1%.
  • the acid value of the polyester resin is in the range of 25-50 mgKOH/g; and/or the viscosity of the polyester resin is in the range of 2500-4500 Pa ⁇ s at a temperature of 200°C.
  • the polyester resin accounts for 50-85% by weight of the base powder coating
  • the hydroxyalkylamide accounts for 1-5% of the base powder coating.
  • the effect pigments include metallic effect pigments and/or pearlescent pigments and/or interference pigments.
  • the transparent powder coating includes polyester resin and hydroxyalkylamide.
  • a hub-bottom-in-one coating is obtained by spraying the above-mentioned hub-bottom-in-one powder coating on an automobile hub substrate, which is formed after curing reaction; and in the bottom-in-one coating A transparent powder coating is sprayed on the upper surface, and after curing reaction, it is formed to obtain a gloss transparent coating.
  • the bottom-in-one coating is located between the hub substrate and the gloss transparent coating; preferably, the hub bottom
  • the thickness of the Zhongheyi coating does not exceed 150 microns.
  • an automobile wheel hub comprises the above-mentioned in-one coating in the hub bottom and a transparent overcoat layer, wherein the in-one coating in the hub bottom is located between the base material of the automobile hub and the transparent overcoat layer.
  • the transparent overcoat layer is formed by spraying a transparent powder coating on the one-in-one coating on the bottom of the wheel hub.
  • test standard for acid value data involved in the present invention is based on GB/T 2895-2008, and the test standard for viscosity is based on GB/T 22314-2008.
  • the present invention adopts pure polyester/HAA (HAA is the English abbreviation of hydroxyalkyl amide and belongs to a general term) curing system as the basic powder coating system to realize the integration of the hub bottom, and at the same time, the acid value range of pure polyester Specific selection can well meet the high-grade (no less than 8 grade) anti-stone performance requirements applied to automobile wheels.
  • HAA is the English abbreviation of hydroxyalkyl amide and belongs to a general term
  • curing system as the basic powder coating system to realize the integration of the hub bottom
  • the acid value range of pure polyester Specific selection can well meet the high-grade (no less than 8 grade) anti-stone performance requirements applied to automobile wheels.
  • effect powder coatings Special effect pigments are used, and the effect pigments are covered with transparent powder coatings. The applicant was surprised to find that mixing the basic powder coatings with effect powder coatings and spraying and curing them on the hub substrate can not only meet the performance of automobile hubs. Standard requirements, while maintaining good adhesion with the transparent powder
  • Figure 1 is a schematic diagram of the coating structure of a car wheel hub in the prior art
  • Figure 2 is a schematic diagram of the coating structure of an automobile wheel hub in a specific embodiment of the present invention.
  • the embodiment of the present invention discloses a powder coating used in the hub bottom, including a base powder coating and an effect powder coating that are mixed into one body, wherein the base powder coating includes a polyester resin with an acid value not higher than 60mgKOH/g and The hydroxyalkyl amide used for curing of polyester resin, the effect powder coating includes an effect pigment, and at least part of the effect pigment is coated with a transparent powder coating.
  • the base powder coating accounts for no less than 50% by weight of the all-in-one powder coating in the hub bottom
  • the effect powder coating accounts for no less than 1% by weight of the all-in-one powder coating in the hub bottom.
  • the weight ratio of the base powder coating and the effect powder coating can be selected according to the metal effect requirements of the application;
  • the acid value of the polyester resin ranges from 25-50mgKOH/g, more preferably In particular, the acid value of the polyester resin is in the range of 28-40 mgKOH/g, and most preferably, the acid value of the polyester resin is in the range of 30-38 mgKOH/g; and/or the viscosity of the polyester resin is in the range of 2500 at 200°C.
  • the polyester resin and HAA within this parameter range can reliably ensure that the coating film has excellent stone-strike resistance (-18°C), and it is at the bottom of the automobile hub substrate , And the transparent cover layer on the surface maintains good adhesion;
  • the polyester resin accounts for 50-85% by weight of the base powder coating
  • the hydroxyalkylamide accounts for 1-5% of the base powder coating
  • the effect pigments include metallic effect pigments and/or pearlescent pigments and/or interference pigments,
  • the specific and preferred effect pigments are silver powder and mica powder.
  • the effect pigments can be selected according to the actual decorative effect requirements. These are not the innovation focus of the present invention;
  • the transparent powder coating includes polyester resin and hydroxyalkyl amide, which is not only beneficial to the matrix The fusion of powder coatings during melting and curing will not affect the basic performance of the cured coating film;
  • the preparation process of the effect powder coating involved in the present application can be adopted: melting the transparent powder coating and stirring at least one effect pigment into the melt, and obtaining the effect powder coating after subsequent cooling and grinding. More preferably, it can be extruded During the process, at least one effect pigment is added to the transparent solidified powder coating melt via at least one side feeder to ensure that at least part of the effect pigment is coated with the transparent powder coating.
  • CN108112257A is mainly used to improve the surface decoration effect of powder coatings and is suitable for application in various basic powder coating systems;
  • the application found that after mixing this effect powder coating with a pure polyester/HAA system with a specific acid value range, it can not only achieve good surface coating and decoration effects on automobile wheels, but also have good interlayer adhesion with the surface finishing layer.
  • the base powder coating and the effect powder coating are mixed by dry mixing; as this preferred solution, in other embodiments, the base powder coating and the effect powder coating are mixed by melting, but the 3D decoration effect will be It is obviously inferior to the implementation of dry mixing.
  • a hub-bottom-in-one coating is sprayed on the automobile hub substrate as the above-mentioned hub-bottom-in-one powder coating, which is formed after curing reaction.
  • the thermal curing conditions are recommended to be 160-220°C.
  • the specific curing window can be selected according to the actual spraying curing line; the thickness of the all-in-one coating in the hub bottom does not exceed 150 microns, more preferably, in the present invention, the all-in-one coating in the hub bottom The thickness range is 80-130 microns, and the single-coating solution formed by innovative powder coating curing directly replaces the prior art dual-coating solution of powder base coating combined with spray paint; spraying transparent powder coating on the bottom-in-one coating, through After the curing reaction, it is formed to obtain a clear coating for the glossing, the curing window is the same as the powder coating for the hub bottom, and the bottom coating is located between the hub base material and the glossing transparent coating.
  • the automotive hub substrate in the embodiments of the present application can be made of aluminum or steel or other metal alloy materials.
  • the automotive hub substrate used in the implementation The material is made of aluminum.
  • an automobile wheel hub includes the above-mentioned in-one coating in the hub bottom and a transparent overcoat layer, and the in-one coating in the hub bottom is located between the base material of the automobile hub and the transparent overcoat layer.
  • the transparent finishing layer is formed by spraying a transparent powder coating on the one-in-one coating on the bottom of the hub, and then curing it.
  • the transparent powder coating is usually acrylic transparent powder coating.
  • the total weight parts of the powder coating raw materials involved in all the embodiments of the application are calculated as 100 parts.
  • Example 1 An all-in-one powder coating for the hub bottom, including a base powder coating and an effect powder coating that are mixed into one body, wherein the base powder coating includes the following raw materials:
  • Polyester resin 70 parts specifically purchased from Synthomer's Albester 5050, its acid value range is 32-38mgKOH/g, and its viscosity at 200°C is 3000-3800Pa.s;
  • the base powder coating can be prepared by the well-known preparation process of powder coatings.
  • the typical well-known powder coating preparation process usually includes raw material blending, melt extrusion, crushing, grinding, cyclone separation, etc.
  • the specific preparation process of the powder coating is not As a technical limitation of the present invention.
  • the effect powder coating of Example 1 is prepared according to the technical solution described in CN108112257A, wherein the effect pigment in the effect powder coating is silver powder with an addition amount of 2-60%. Specifically, more preferably, in this embodiment, The effect pigment in the effect powder coating uses 15-50% silver powder. The specific addition amount can be selected according to the requirements of the metal effect. This embodiment is not particularly limited.
  • the transparent powder coating of this embodiment 1 is used with the matrix The same raw materials for powder coatings;
  • the silver powder of Example 1 was added to the transparent solidified powder coating melt via a side feeder during the extrusion process to ensure that at least part or all of the silver powder was coated with the transparent powder coating, and then crushed, ground,
  • the effect powder coating is prepared by the cyclone separation process;
  • the base powder coating 75% by weight and the effect powder coating 25% by weight were dry blended to obtain the all-in-one powder coating for the hub bottom in Example 1.
  • this embodiment also proposes a hub-bottom-in-one coating 22, which is sprayed on the automobile hub substrate 21 with the above-mentioned hub-bottom-in-one powder coating of the first embodiment, which is formed by thermosetting Obtained later; the thickness of the one-in-one coating 22 in the hub bottom is 110-130 microns, and the heat curing conditions are set at 175-185°C@12-18 minutes;
  • This embodiment also proposes an automobile wheel hub, which includes the above-mentioned central-in-one coating 22 of the hub bottom and a transparent overcoat layer 23 (using acrylic transparent powder at 175-185°C@12-18 minutes), which is sprayed and cured at 175-185°C@12-18 minutes. Obtained), the in-one coating 22 in the hub bottom is located between the automobile hub substrate 21 and the transparent glazing layer 23, and the thickness of the transparent glazing layer 23 is 90-110 microns.
  • Embodiment 2 An integrated powder coating for the hub bottom, including a base powder coating and an effect powder coating that are mixed into one body, wherein the base powder coating includes the following raw materials:
  • polyester resin specifically purchased from Polyester resin H890 provided by TIGER, with an acid value of 30-36mgKOH/g and a viscosity of 3000-3300Pa.s at 200°C;
  • Embodiment 3 The technical solution of this embodiment 3 is the same as that of embodiment 1, except that the base powder coating of this embodiment 3 includes the following raw materials:
  • the base powder coating 50% by weight and the effect powder coating 50% by weight were dry blended to obtain the all-in-one powder coating for the hub bottom in Example 3.
  • Embodiment 4 The technical solution of this embodiment 4 is the same as that of embodiment 2, except that the base powder coating of this embodiment 4 includes the following raw materials:
  • the base powder coating 60% by weight and the effect powder coating 40% by weight were dry blended to obtain the all-in-one powder coating for the hub bottom in Example 4.
  • Embodiment 5 The technical solution of this embodiment 5 is the same as that of embodiment 1, except that the base powder coating of this embodiment 5 includes the following raw materials:
  • Embodiment 6 The technical solution of this embodiment 6 is the same as that of embodiment 2, except that the base powder coating of this embodiment 6 includes the following raw materials:
  • Comparative Example 1 Using the one-in-one electroplating silver powder coating on the bottom surface of the automobile aluminum hub disclosed by CN107892865A was used as the one-in-one coating on the bottom of the hub, and spraying and curing was carried out on the same substrate of the automobile hub as in Example 1, and the coating thickness was 110 -130 microns.
  • Comparative Example 2 Using 75% by weight of CN107892865A disclosed automobile aluminum wheel bottom surface integrated silver electroplating special primer powder coating dry blended with 25% by weight of the effect powder coating of Example 1 in comparison with In the first embodiment, the same automobile hub substrate was sprayed and cured, and the thickness of the coating was 110-130 microns.
  • Comparative Example 3 The remaining technical solutions of this Comparative Example 3 are the same as those of Example 1, except that in this Comparative Example 3, 3.5 parts of hydroxyalkylamide HAA in Example 1 are replaced with 5 parts of TGIC, and barium sulfate is used in 100 parts of total Under the condition of parts by weight, adjust the remaining amount.
  • Comparative Example 4 The remaining technical solutions of this Comparative Example 4 are the same as those of Example 1, except that this Comparative Example 4 uses silver powder whose base powder coating bond is added in an amount of 5%.
  • Comparative Example 5 The remaining technical solutions of this Comparative Example 5 are the same as those of Example 2, except that this Comparative Example 5 uses silver powder with a bonding amount of 5% in the base powder coating.
  • this application has carried out a comparative test of the effects of the automobile wheels (including the bottom-in-one coating and acrylic transparent powder overcoat) obtained in each embodiment and comparative example according to the enterprise standard grade requirements of major automobile manufacturers:
  • the hub bottom center-in-one powder coating provided in this example is used as the bottom center-in-one coating of automobile wheels, which not only maintains good adhesion with the hub substrate, but also can be directly used as The coating base material of the overcoat transparent powder not only maintains good adhesion with the overcoat transparent powder, but also does not negatively affect the leveling effect of the overcoat transparent powder. This is also the final batch of automobile wheel manufacturers. The technical key to the applied integrated coating solution in the hub bottom.

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Abstract

Disclosed is a powdery primer-and-intermediate-in-one coating for wheel hub use, the coating comprising a matrix powdery coating and an effect powder coating that are mixed as a whole, wherein the matrix powdery coating comprises a polyester resin having an acid value of not greater than 60 mgKOH/g and a hydroxyalkylamide used for curing the polyester resin, and the effect powder coating comprises an effect pigment, and at least part of the effect pigment is coated with a transparent powdery coating. The present invention further relates to a primer-and-intermediate-in-one coating layer regarding the application of the powdery primer-and-intermediate-in-one coating for wheel hub use and to an automobile wheel hub. The powdery primer-and-intermediate-in-one coating for wheel hub use is sprayed on a wheel hub and subjected to a curing molding process to obtain a primer-and-intermediate-in-one coating layer, and the primer-and-intermediate-in-one coating layer is sprayed with a curing transparent powder coating layer to obtain a glazing transparent coating layer. The present invention directly replaces a double-coating solution regarding primer coating combined with painting in the prior art by proposing an innovative mono-coating-layer solution regarding curing and molding a powdery coating. The present invention achieves a good surface coating decorative effect while satisfying automobile wheel hub testing standard requirements.

Description

轮毂底中合一用粉末涂料及其底中合一涂层、汽车轮毂Powder coating for center-in-one hub bottom and its bottom-in-one coating, automobile wheel hub
本申请要求于2019年11月28日提交中国国家知识产权局专利局，申请号为201810421131.5、发明名称为“一种混料设备的自动清洗***以及应用”的中国专利申请优先权，其全部内容通过引用结合在本申请中。This application claims the priority of a Chinese patent application filed with the Patent Office of the State Intellectual Property Office of China on November 28, 2019. The application number is 201810421131.5 and the title of the invention is "An automatic cleaning system and application for mixing equipment". The entire content of the Chinese patent application Incorporated in this application by reference.
技术领域Technical field
本发明属于热固性粉末涂料领域，具体涉及了一种轮毂底中合一用粉末涂料，本发明还涉及该粉末涂料应用的底中合一涂层以及汽车轮毂。The invention belongs to the field of thermosetting powder coatings, and specifically relates to a powder coating for hub bottom in one. The invention also relates to a bottom and center coating applied by the powder coating and an automobile wheel hub.
背景技术Background technique
近年来，政府和社会对环境、安全、能源等问题越来越重视，为配合汽车工业节能减排，发展环保型汽车涂料并倡导汽车涂装工艺的清洁生产成为汽车涂料生产和涂装企业的关注重点。随着中国成为全球最大的汽车铝轮毂生产国，丙烯酸透明粉罩光的汽车轮毂的市场容量巨大。In recent years, the government and society have paid more and more attention to issues such as environment, safety, and energy. In order to cooperate with the automotive industry to save energy and reduce emissions, develop environmentally friendly automotive coatings and advocate clean production of automotive coating processes to become an important part of automotive coating production and coating companies. Focus on the key points. As China has become the world's largest producer of automotive aluminum wheels, the market capacity of automotive wheels covered with acrylic transparent powder is huge.
请参见图1所示，然而在现有技术中，采用丙烯酸透明粉罩光的汽车轮毂11通常采用粉末涂料固化底涂层12(厚度通常在80-130微米)+喷油漆(厚度通常在10-30微米)作为中间油漆效果层13，最后喷涂透明粉(厚度通常在80-120微米)作为罩光层14，中间油漆效果层13不仅作为装饰效果层，同时需同时确保与粉末固化底涂层以及罩光层之间的良好附着力，然而采用中间油漆效果层13会存在环保问题，污染严重，而且涂装过程复杂。Please refer to Figure 1. However, in the prior art, the car wheel 11 with transparent acrylic powder overcoat usually uses powder coating to cure the base coat 12 (the thickness is usually 80-130 microns) + spray paint (the thickness is usually 10 -30 microns) as the intermediate paint effect layer 13, and finally sprayed with transparent powder (the thickness is usually 80-120 microns) as the overcoat layer 14. The intermediate paint effect layer 13 is not only used as a decorative effect layer, but also needs to be combined with the powder curing primer The adhesion between the layer and the overcoat layer is good. However, the use of the intermediate paint effect layer 13 will have environmental protection problems, serious pollution, and a complicated coating process.
为了解决这一技术问题，公开号为CN107892865A的发明专利公开了一种汽车铝轮毂底面合一电镀银专用底粉涂料，具体为聚酯-环氧混合体系，主要由以下质量份配比的成分组成：饱和羧基聚酯树脂：100～120、环氧树脂50～80、助剂0.1～10；为了实现金属油漆效果，以该聚酯-环氧混合体系作为底粉， 邦定浮型铝银粉实现对汽车轮毂的底中合一涂装。然而申请人发现该技术方案采用聚酯-环氧混合体系不仅无法可靠满足更高等级(不低于8级)的抗石击性能，同时耐候性能不佳，而且该技术方案采用邦定金属银粉作为汽车轮毂的底中合一涂装层，然而该技术的涂膜表面并不适合进一步设置透明罩光层，两者之间的附着力差，而且也进一步直接影响罩光的流平效果，因此，将CN107892865A提供的粉末涂料直接作为汽车轮毂的底中合一涂层粉末是无法真正产业推广应用的技术方案。In order to solve this technical problem, the invention patent with publication number CN107892865A discloses a special primer coating for silver electroplating on the underside of automobile aluminum wheels, which is specifically a polyester-epoxy hybrid system, which is mainly composed of the following components in parts by mass Composition: Saturated carboxyl polyester resin: 100～120, epoxy resin 50～80, additives 0.1～10; in order to achieve the effect of metallic paint, the polyester-epoxy hybrid system is used as the base powder, bonding floating aluminum silver powder Realize the integrated painting of the bottom and the center of the car wheel. However, the applicant found that the technical solution adopts the polyester-epoxy hybrid system not only cannot reliably meet the stone-strike resistance of higher grades (not lower than 8), but also has poor weather resistance. Moreover, the technical solution uses bonding metal silver powder. As an integrated coating layer in the bottom of a car wheel, the surface of the coating film of this technology is not suitable for further providing a transparent overcoat layer, the adhesion between the two is poor, and it further directly affects the leveling effect of the overcoat. Therefore, using the powder coating provided by CN107892865A directly as the bottom-in-one coating powder of automobile wheels is a technical solution that cannot be truly promoted and applied in the industry.
本申请人基于对粉末涂料的多年专注研发经验，决定寻求技术方案对实现对汽车轮毂的底中合一粉末方案。Based on years of dedicated research and development experience in powder coatings, the applicant decided to seek a technical solution to achieve a bottom-in-one powder solution for automobile wheels.
发明内容Summary of the invention
有鉴于此，本发明的目的在于提供一种轮毂底中合一用粉末涂料及其底中合一涂层以及汽车轮毂，通过提出创新粉末涂料固化成型的单涂层方案直接取代现有技术的底涂结合喷漆的双涂方案，本发明在满足汽车轮毂检测标准需求的前提下，同时实现良好的表面涂装装饰效果。In view of this, the purpose of the present invention is to provide a powder coating for the bottom of the hub, its bottom coating, and automobile wheels, which directly replace the existing technology by proposing an innovative single coating solution for curing and molding of powder coatings. With the dual-coating scheme of primer coating combined with spray paint, the present invention can achieve a good surface coating decoration effect at the same time on the premise of meeting the requirements of automobile wheel detection standards.
本发明采用的技术方案如下：The technical scheme adopted by the present invention is as follows:
一种轮毂底中合一用粉末涂料，包括混合为一体的基体粉末涂料和效果粉末涂料，其中，所述基体粉末涂料包括其酸值不高于60mgKOH/g的聚酯树脂和用于所述聚酯树脂固化的羟烷基酰胺，所述效果粉末涂料包括效果颜料，且至少部分效果颜料包覆有透明粉末涂料。An all-in-one powder coating for wheel hub bottoms, comprising a base powder coating and an effect powder coating that are mixed as a whole, wherein the base powder coating includes a polyester resin whose acid value is not higher than 60 mgKOH/g and used for the Polyester resin cured hydroxyalkylamide, the effect powder coating includes an effect pigment, and at least part of the effect pigment is coated with a transparent powder coating.
优选地，所述基体粉末涂料和效果粉末涂料通过干混混合。Preferably, the base powder coating and the effect powder coating are mixed by dry mixing.
优选地，所述基体粉末涂料和效果粉末涂料通过熔融混合。Preferably, the base powder coating and the effect powder coating are mixed by melting.
优选地，所述基体粉末涂料占所述轮毂底中合一用粉末涂料的重量份不低于50％，所述效果粉末涂料占所述轮毂底中合一用粉末涂料的重量份不低于1％。Preferably, the base powder coating accounts for no less than 50% by weight of the all-in-one powder coating in the hub bottom, and the effect powder coating accounts for no less than 50% by weight of the all-in-one powder coating in the hub bottom. 1%.
优选地，所述聚酯树脂的酸值范围为25-50mgKOH/g；和/或所述聚酯树 脂在200℃温度下的粘度范围在2500-4500Pa.s。Preferably, the acid value of the polyester resin is in the range of 25-50 mgKOH/g; and/or the viscosity of the polyester resin is in the range of 2500-4500 Pa·s at a temperature of 200°C.
优选地，所述聚酯树脂占所述基体粉末涂料重量份范围为50-85％，所述羟烷基酰胺占所述基体粉末涂料的1-5％。Preferably, the polyester resin accounts for 50-85% by weight of the base powder coating, and the hydroxyalkylamide accounts for 1-5% of the base powder coating.
优选地，所述效果颜料包括金属效果颜料和/或珠光颜料和/或干涉颜料。Preferably, the effect pigments include metallic effect pigments and/or pearlescent pigments and/or interference pigments.
优选地，所述透明粉末涂料包括聚酯树脂和羟烷基酰胺。Preferably, the transparent powder coating includes polyester resin and hydroxyalkylamide.
优选地，一种轮毂底中合一涂层，在汽车轮毂基材上喷涂如上所述的轮毂底中合一用粉末涂料，经过固化反应后成型得到；且在所述底中合一涂层上喷涂透明粉末涂料，经过固化反应后成型得到罩光透明涂层，所述底中合一涂层位于所述轮毂基材与所述罩光透明涂层之间；优选地，所述轮毂底中合一涂层的厚度不超过150微米。Preferably, a hub-bottom-in-one coating is obtained by spraying the above-mentioned hub-bottom-in-one powder coating on an automobile hub substrate, which is formed after curing reaction; and in the bottom-in-one coating A transparent powder coating is sprayed on the upper surface, and after curing reaction, it is formed to obtain a gloss transparent coating. The bottom-in-one coating is located between the hub substrate and the gloss transparent coating; preferably, the hub bottom The thickness of the Zhongheyi coating does not exceed 150 microns.
优选地，一种汽车轮毂，包括如上所述的轮毂底中合一涂层以及透明罩光层，所述轮毂底中合一涂层位于所述汽车轮毂基材与所述透明罩光层之间；所述透明罩光层采用在所述轮毂底中合一涂层上喷涂透明粉末涂料后固化成型。Preferably, an automobile wheel hub comprises the above-mentioned in-one coating in the hub bottom and a transparent overcoat layer, wherein the in-one coating in the hub bottom is located between the base material of the automobile hub and the transparent overcoat layer. Between; the transparent overcoat layer is formed by spraying a transparent powder coating on the one-in-one coating on the bottom of the wheel hub.
本发明涉及的酸值数据的检测标准依据是GB/T 2895-2008，粘度的检测标准依据是GB/T 22314-2008。The test standard for acid value data involved in the present invention is based on GB/T 2895-2008, and the test standard for viscosity is based on GB/T 22314-2008.
本发明一方面通过采用纯聚酯/HAA(HAA是羟烷基酰胺的英文缩写，属于通用术语)固化体系作为实现轮毂底中合一的基础粉末涂料体系，同时对纯聚酯的酸值范围进行特定选择，可以良好满足应用于汽车轮毂的高等级(不低于8级)抗石击性能要求，同时在另一方面通过添加与基础粉末涂料体系混合为一体的效果粉末涂料，效果粉末涂料特别采用效果颜料，效果颜料包覆有透明粉末涂料，本申请人惊喜地发现将将该基础粉末涂料混合效果粉末涂料后在轮毂基材上进行喷涂固化得到的涂膜不仅可以满足汽车轮毂的性能标准需求，同时与透明粉罩光层保持良好的附着力，可以表现出媲美现有技 术油漆效果层的外观涂装装饰效果。On the one hand, the present invention adopts pure polyester/HAA (HAA is the English abbreviation of hydroxyalkyl amide and belongs to a general term) curing system as the basic powder coating system to realize the integration of the hub bottom, and at the same time, the acid value range of pure polyester Specific selection can well meet the high-grade (no less than 8 grade) anti-stone performance requirements applied to automobile wheels. At the same time, on the other hand, by adding effect powder coatings that are mixed with the basic powder coating system, effect powder coatings Special effect pigments are used, and the effect pigments are covered with transparent powder coatings. The applicant was surprised to find that mixing the basic powder coatings with effect powder coatings and spraying and curing them on the hub substrate can not only meet the performance of automobile hubs. Standard requirements, while maintaining good adhesion with the transparent powder overcoat layer, it can show the appearance and coating decoration effect comparable to the prior art paint effect layer.
附图说明Description of the drawings
附图1是现有技术汽车轮毂的涂层结构示意图；Figure 1 is a schematic diagram of the coating structure of a car wheel hub in the prior art;
附图2是本发明具体实施方式下汽车轮毂的涂层结构示意图。Figure 2 is a schematic diagram of the coating structure of an automobile wheel hub in a specific embodiment of the present invention.
具体实施方式Detailed ways
本发明实施例公开了一种轮毂底中合一用粉末涂料，包括混合为一体的基体粉末涂料和效果粉末涂料，其中，基体粉末涂料包括其酸值不高于60mgKOH/g的聚酯树脂和用于聚酯树脂固化的羟烷基酰胺，效果粉末涂料包括效果颜料，且至少部分效果颜料包覆有透明粉末涂料。The embodiment of the present invention discloses a powder coating used in the hub bottom, including a base powder coating and an effect powder coating that are mixed into one body, wherein the base powder coating includes a polyester resin with an acid value not higher than 60mgKOH/g and The hydroxyalkyl amide used for curing of polyester resin, the effect powder coating includes an effect pigment, and at least part of the effect pigment is coated with a transparent powder coating.
优选地，在本实施方式中，基体粉末涂料占轮毂底中合一用粉末涂料的重量份不低于50％，效果粉末涂料占轮毂底中合一用粉末涂料的重量份不低于1％，本领域技术人员在实际实施本申请时，基体粉末涂料和效果粉末涂料的重量份比例可以根据其应用的金属效果要求来选择；聚酯树脂的酸值范围为25-50mgKOH/g，更优选地，聚酯树脂的酸值范围为28-40mgKOH/g，最优选地，聚酯树脂的酸值范围为30-38mgKOH/g；和/或聚酯树脂在200℃温度下的粘度范围在2500-4500Pa.s，通过特定筛选检测，该参数范围下的聚酯树脂与HAA固化后可以可靠地保证涂膜具有优异的抗石击性能(-18℃)，同时与位于底部的汽车轮毂基材、以及位于表层的透明罩光层保持良好的附着结合力；Preferably, in this embodiment, the base powder coating accounts for no less than 50% by weight of the all-in-one powder coating in the hub bottom, and the effect powder coating accounts for no less than 1% by weight of the all-in-one powder coating in the hub bottom. When a person skilled in the art actually implements this application, the weight ratio of the base powder coating and the effect powder coating can be selected according to the metal effect requirements of the application; the acid value of the polyester resin ranges from 25-50mgKOH/g, more preferably In particular, the acid value of the polyester resin is in the range of 28-40 mgKOH/g, and most preferably, the acid value of the polyester resin is in the range of 30-38 mgKOH/g; and/or the viscosity of the polyester resin is in the range of 2500 at 200°C. -4500Pa.s, through a specific screening test, the polyester resin and HAA within this parameter range can reliably ensure that the coating film has excellent stone-strike resistance (-18°C), and it is at the bottom of the automobile hub substrate , And the transparent cover layer on the surface maintains good adhesion;
优选地，聚酯树脂占基体粉末涂料重量份范围为50-85％，羟烷基酰胺占基体粉末涂料的1-5％；效果颜料包括金属效果颜料和/或珠光颜料和/或干涉颜料，具体优选的效果颜料为银粉、云母粉，具体可以根据实际装饰效果需求来选择效果颜料，这些也不属于本发明的创新重点；透明粉末涂料包括聚酯树脂和羟烷基酰胺，不仅利于与基体粉末涂料在熔融固化的融合，同时不 会影响固化涂膜的基本性能；Preferably, the polyester resin accounts for 50-85% by weight of the base powder coating, and the hydroxyalkylamide accounts for 1-5% of the base powder coating; the effect pigments include metallic effect pigments and/or pearlescent pigments and/or interference pigments, The specific and preferred effect pigments are silver powder and mica powder. The effect pigments can be selected according to the actual decorative effect requirements. These are not the innovation focus of the present invention; the transparent powder coating includes polyester resin and hydroxyalkyl amide, which is not only beneficial to the matrix The fusion of powder coatings during melting and curing will not affect the basic performance of the cured coating film;
本申请涉及的效果粉末涂料的制备工艺可以采用：熔化透明粉末涂料并且将至少一种效果颜料搅拌到熔体中，通过后续冷却和磨粉后得到效果粉末涂料，更优选地，可以在挤出过程中经由至少一个侧进料器将至少一种效果颜料添加到透明固化的粉末涂料熔体中，确保至少部分效果颜料包覆有透明粉末涂料。The preparation process of the effect powder coating involved in the present application can be adopted: melting the transparent powder coating and stirring at least one effect pigment into the melt, and obtaining the effect powder coating after subsequent cooling and grinding. More preferably, it can be extruded During the process, at least one effect pigment is added to the transparent solidified powder coating melt via at least one side feeder to ensure that at least part of the effect pigment is coated with the transparent powder coating.
本申请涉及的效果粉末涂料可以直接参见本申请人关联申请人的在先申请CN108112257A记载的技术方案，CN108112257A主要用于改善粉末涂料的表面装饰效果，适合应用各类基础粉末涂料体系中；而本申请发现将该效果粉末涂料与具有特定酸值范围的纯聚酯/HAA体系混合后，既可以对汽车轮毂实现良好的表面涂装装饰效果，同时可与表面罩光层具有良好的层间附着力，进而不会影响表面罩光层的高流平罩光效果，而且本领域技术人员通过CN108112257A的记载方案内容，仅仅会将其直接作为表面效果涂装粉末产品应用，不会有动机想到将其作为汽车轮毂实现底中合一(即为底涂+中涂采用一种粉末涂料经一次性固化成型)的特定技术手段之一，将其与特定树脂固化体系组合后成为本申请所采用的特性技术方案，实现了新的技术效果，也是本申请的核心创新内容。The effect powder coating involved in this application can be directly referred to the technical solution described in the applicant's related applicant's earlier application CN108112257A. CN108112257A is mainly used to improve the surface decoration effect of powder coatings and is suitable for application in various basic powder coating systems; The application found that after mixing this effect powder coating with a pure polyester/HAA system with a specific acid value range, it can not only achieve good surface coating and decoration effects on automobile wheels, but also have good interlayer adhesion with the surface finishing layer. It will not affect the high-leveling and smoothing effect of the surface coating layer, and those skilled in the art will only use it directly as a surface effect coating powder product through the content of the CN108112257A record, and will not have the motivation to think of using it as a coating powder product. One of the specific technical means to realize bottom-in-one integration of automobile wheels (that is, the primer + middle coat is formed by one-time curing of a powder coating). Combining it with a specific resin curing system becomes the characteristic technology used in this application The solution achieves new technical effects and is also the core innovation content of this application.
优选地，在本实施方式中，基体粉末涂料和效果粉末涂料通过干混混合；作为此优选方案，在其他实施方式中，基体粉末涂料和效果粉末涂料通过熔融混合，但在3D装饰效果上会明显差于采用干混混合的实施方案。Preferably, in this embodiment, the base powder coating and the effect powder coating are mixed by dry mixing; as this preferred solution, in other embodiments, the base powder coating and the effect powder coating are mixed by melting, but the 3D decoration effect will be It is obviously inferior to the implementation of dry mixing.
优选地，一种轮毂底中合一涂层，在汽车轮毂基材上喷涂如上的轮毂底中合一用粉末涂料，经过固化反应后成型，其中，热固化条件范围建议选择在160-220℃@5-25分钟，具体可以根据实际喷涂固化线来选择合适的固化窗口；轮毂底中合一涂层的厚度不超过150微米，更优选地，本发明中，轮毂底中合一涂层的厚度范围为80-130微米，通过创新粉末涂料固化成型的单涂 层方案直接取代了现有技术的粉末底涂结合喷漆的双涂方案；在底中合一涂层上喷涂透明粉末涂料，经过固化反应后成型得到罩光透明涂层，固化窗口与轮毂底中合一用粉末涂料相同，底中合一涂层位于轮毂基材与罩光透明涂层之间。Preferably, a hub-bottom-in-one coating is sprayed on the automobile hub substrate as the above-mentioned hub-bottom-in-one powder coating, which is formed after curing reaction. The thermal curing conditions are recommended to be 160-220°C. @5-25 minutes, the specific curing window can be selected according to the actual spraying curing line; the thickness of the all-in-one coating in the hub bottom does not exceed 150 microns, more preferably, in the present invention, the all-in-one coating in the hub bottom The thickness range is 80-130 microns, and the single-coating solution formed by innovative powder coating curing directly replaces the prior art dual-coating solution of powder base coating combined with spray paint; spraying transparent powder coating on the bottom-in-one coating, through After the curing reaction, it is formed to obtain a clear coating for the glossing, the curing window is the same as the powder coating for the hub bottom, and the bottom coating is located between the hub base material and the glossing transparent coating.
本申请实施例中的汽车轮毂基材可以采用铝材质或钢材或其他金属合金材质，优选地，为了确保轻质以及耐腐蚀性能，优选地，本申请人建议在实施时，应用的汽车轮毂基材采用铝材质。The automotive hub substrate in the embodiments of the present application can be made of aluminum or steel or other metal alloy materials. Preferably, in order to ensure light weight and corrosion resistance, preferably, the applicant suggests that the automotive hub substrate used in the implementation The material is made of aluminum.
优选地，一种汽车轮毂，包括如上所述的轮毂底中合一涂层以及透明罩光层，轮毂底中合一涂层位于汽车轮毂基材与透明罩光层之间，更优选地，透明罩光层采用在轮毂底中合一涂层上喷涂透明粉末涂料后固化成型，透明粉末涂料通常采用丙烯酸透明粉末涂料。Preferably, an automobile wheel hub includes the above-mentioned in-one coating in the hub bottom and a transparent overcoat layer, and the in-one coating in the hub bottom is located between the base material of the automobile hub and the transparent overcoat layer. More preferably, The transparent finishing layer is formed by spraying a transparent powder coating on the one-in-one coating on the bottom of the hub, and then curing it. The transparent powder coating is usually acrylic transparent powder coating.
为了进一步说明本申请的技术方案及其所带来的技术效果，本申请下文将进一步具体展开各具体实施例：In order to further illustrate the technical solution of the present application and the technical effects brought about by it, the following specific embodiments of the present application will be further developed in detail:
本申请所有实施例涉及的粉末涂料原料配比总重量份均按100份计算。The total weight parts of the powder coating raw materials involved in all the embodiments of the application are calculated as 100 parts.
实施例1：一种轮毂底中合一用粉末涂料，包括混合为一体的基体粉末涂料和效果粉末涂料，其中，基体粉末涂料包括如下原料：Example 1: An all-in-one powder coating for the hub bottom, including a base powder coating and an effect powder coating that are mixed into one body, wherein the base powder coating includes the following raw materials:
聚酯树脂         70份，具体购自昕特玛synthomer的Albester 5050，其酸值范围为32-38mgKOH/g，在200℃温度下的粘度为在3000-3800Pa.s；Polyester resin 70 parts, specifically purchased from Synthomer's Albester 5050, its acid value range is 32-38mgKOH/g, and its viscosity at 200°C is 3000-3800Pa.s;
羟烷基酰胺HAA    3份，市购得到；3 copies of hydroxyalkylamide HAA, commercially available;
流平剂           1份Leveling agent 1 copy
脱气剂           1份，市购得到；1 copy of degassing agent, commercially available;
硫酸钡           余量，市购得到；The balance of barium sulfate is available on the market;
基体粉末涂料可以通过粉末涂料的公知制备工艺制备得到，例如：典型公知的粉末涂料制备工艺通常包括原料共混、熔融挤出、破碎、磨粉、旋风分离等工序，粉末涂料的具体制备工艺不作为对本发明的技术限定；The base powder coating can be prepared by the well-known preparation process of powder coatings. For example, the typical well-known powder coating preparation process usually includes raw material blending, melt extrusion, crushing, grinding, cyclone separation, etc. The specific preparation process of the powder coating is not As a technical limitation of the present invention;
本实施例1的效果粉末涂料依据CN108112257A记载的技术方案制备得到，其中，效果粉末涂料中的效果颜料采用添加量为2-60％的银粉，具体地，更优选地，在本实施方式中，效果粉末涂料中的效果颜料采用添加量为15-50％的银粉，具体添加量可以根据金属效果要求来选择添加，本实施例对其没有特别限定，本实施例1的透明粉末涂料采用与基体粉末涂料相同的原料；The effect powder coating of Example 1 is prepared according to the technical solution described in CN108112257A, wherein the effect pigment in the effect powder coating is silver powder with an addition amount of 2-60%. Specifically, more preferably, in this embodiment, The effect pigment in the effect powder coating uses 15-50% silver powder. The specific addition amount can be selected according to the requirements of the metal effect. This embodiment is not particularly limited. The transparent powder coating of this embodiment 1 is used with the matrix The same raw materials for powder coatings;
具体地，本实施例1的银粉在挤出过程中经由侧进料器添加到透明固化的粉末涂料熔体中，确保至少部分或全部银粉包覆有透明粉末涂料，然后通过破碎、磨粉、旋风分离工序制备得到效果粉末涂料；Specifically, the silver powder of Example 1 was added to the transparent solidified powder coating melt via a side feeder during the extrusion process to ensure that at least part or all of the silver powder was coated with the transparent powder coating, and then crushed, ground, The effect powder coating is prepared by the cyclone separation process;
按重量份占比为75％的基体粉末涂料以及重量份占比为25％的效果粉末涂料进行干混，得到本实施例1中的轮毂底中合一用粉末涂料。The base powder coating 75% by weight and the effect powder coating 25% by weight were dry blended to obtain the all-in-one powder coating for the hub bottom in Example 1.
请参见图2所示，本实施例还提出了一种轮毂底中合一涂层22，在汽车轮毂基材21上喷涂本实施例1上述轮毂底中合一用粉末涂料，通过热固化成型后得到；轮毂底中合一涂层22的厚度为110-130微米，热固化的条件设置在175-185℃@12-18分钟；As shown in Figure 2, this embodiment also proposes a hub-bottom-in-one coating 22, which is sprayed on the automobile hub substrate 21 with the above-mentioned hub-bottom-in-one powder coating of the first embodiment, which is formed by thermosetting Obtained later; the thickness of the one-in-one coating 22 in the hub bottom is 110-130 microns, and the heat curing conditions are set at 175-185°C@12-18 minutes;
本实施例还提出了一种汽车轮毂，包括本实施例上述的轮毂底中合一涂层22以及透明罩光层23(采用丙烯酸透明粉末在175-185℃@12-18分钟下喷涂固化制得)，轮毂底中合一涂层22位于汽车轮毂基材21与透明罩光层23之间，透明罩光层23的厚度为90-110微米。This embodiment also proposes an automobile wheel hub, which includes the above-mentioned central-in-one coating 22 of the hub bottom and a transparent overcoat layer 23 (using acrylic transparent powder at 175-185°C@12-18 minutes), which is sprayed and cured at 175-185°C@12-18 minutes. Obtained), the in-one coating 22 in the hub bottom is located between the automobile hub substrate 21 and the transparent glazing layer 23, and the thickness of the transparent glazing layer 23 is 90-110 microns.
实施例2：一种轮毂底中合一用粉末涂料，包括混合为一体的基体粉末涂料和效果粉末涂料，其中，基体粉末涂料包括如下原料：Embodiment 2: An integrated powder coating for the hub bottom, including a base powder coating and an effect powder coating that are mixed into one body, wherein the base powder coating includes the following raw materials:
聚酯树脂         70份，具体购自TIGER公司提供的Polyester resin H890，其酸值范围为30-36mgKOH/g，在200℃温度下的粘度为在3000-3300Pa.s；70 parts of polyester resin, specifically purchased from Polyester resin H890 provided by TIGER, with an acid value of 30-36mgKOH/g and a viscosity of 3000-3300Pa.s at 200°C;
Figure PCTCN2020127329-appb-000001
Figure PCTCN2020127329-appb-000001
Figure PCTCN2020127329-appb-000002
Figure PCTCN2020127329-appb-000002
本实施例2的其余技术方案同实施例1。The remaining technical solutions of the second embodiment are the same as those of the first embodiment.
实施例3：本实施例3的技术方案同实施例1，区别在于，本实施例3的基体粉末涂料包括如下原料：Embodiment 3: The technical solution of this embodiment 3 is the same as that of embodiment 1, except that the base powder coating of this embodiment 3 includes the following raw materials:
Figure PCTCN2020127329-appb-000003
Figure PCTCN2020127329-appb-000003
按重量份占比为50％的基体粉末涂料以及重量份占比为50％的效果粉末涂料进行干混，得到本实施例3中的轮毂底中合一用粉末涂料。The base powder coating 50% by weight and the effect powder coating 50% by weight were dry blended to obtain the all-in-one powder coating for the hub bottom in Example 3.
实施例4：本实施例4的技术方案同实施例2，区别在于，本实施例4的基体粉末涂料包括如下原料：Embodiment 4: The technical solution of this embodiment 4 is the same as that of embodiment 2, except that the base powder coating of this embodiment 4 includes the following raw materials:
Figure PCTCN2020127329-appb-000004
Figure PCTCN2020127329-appb-000004
按重量份占比为60％的基体粉末涂料以及重量份占比为40％的效果粉末涂料进行干混，得到本实施例4中的轮毂底中合一用粉末涂料。The base powder coating 60% by weight and the effect powder coating 40% by weight were dry blended to obtain the all-in-one powder coating for the hub bottom in Example 4.
实施例5：本实施例5的技术方案同实施例1，区别在于，本实施例5的基体粉末涂料包括如下原料：Embodiment 5: The technical solution of this embodiment 5 is the same as that of embodiment 1, except that the base powder coating of this embodiment 5 includes the following raw materials:
Figure PCTCN2020127329-appb-000005
Figure PCTCN2020127329-appb-000005
Figure PCTCN2020127329-appb-000006
Figure PCTCN2020127329-appb-000006
实施例6：本实施例6的技术方案同实施例2，区别在于，本实施例6的基体粉末涂料包括如下原料：Embodiment 6: The technical solution of this embodiment 6 is the same as that of embodiment 2, except that the base powder coating of this embodiment 6 includes the following raw materials:
Figure PCTCN2020127329-appb-000007
Figure PCTCN2020127329-appb-000007
对比例1：采用CN107892865A公开的汽车铝轮毂底面合一电镀银粉末涂料用于轮毂底中合一涂层，在与本实施例1相同的汽车轮毂基材上进行喷涂固化，涂层厚度为110-130微米。Comparative Example 1: Using the one-in-one electroplating silver powder coating on the bottom surface of the automobile aluminum hub disclosed by CN107892865A was used as the one-in-one coating on the bottom of the hub, and spraying and curing was carried out on the same substrate of the automobile hub as in Example 1, and the coating thickness was 110 -130 microns.
对比例2：采用重量份占比为75％的CN107892865A公开的汽车铝轮毂底面合一电镀银专用底粉涂料干混重量份占比为25％的本实施例1中的效果粉末涂料，在与本实施例1相同的汽车轮毂基材上进行喷涂固化，涂层厚度为110-130微米。Comparative Example 2: Using 75% by weight of CN107892865A disclosed automobile aluminum wheel bottom surface integrated silver electroplating special primer powder coating dry blended with 25% by weight of the effect powder coating of Example 1 in comparison with In the first embodiment, the same automobile hub substrate was sprayed and cured, and the thickness of the coating was 110-130 microns.
对比例3：本对比例3的其余技术方案与实施例1相同，区别在于，本对比例3将实施例1中3.5份羟烷基酰胺HAA替换为5份TGIC，同时硫酸钡在100份总重量份条件下对其余量做适应调整。Comparative Example 3: The remaining technical solutions of this Comparative Example 3 are the same as those of Example 1, except that in this Comparative Example 3, 3.5 parts of hydroxyalkylamide HAA in Example 1 are replaced with 5 parts of TGIC, and barium sulfate is used in 100 parts of total Under the condition of parts by weight, adjust the remaining amount.
对比例4：本对比例4的其余技术方案与实施例1相同，区别在于，本对比例4采用在基体粉末涂料邦定添加量为5％的银粉。Comparative Example 4: The remaining technical solutions of this Comparative Example 4 are the same as those of Example 1, except that this Comparative Example 4 uses silver powder whose base powder coating bond is added in an amount of 5%.
对比例5：本对比例5的其余技术方案与实施例2相同，区别在于，本对比例5采用在基体粉末涂料邦定添加量为5％的银粉。Comparative Example 5: The remaining technical solutions of this Comparative Example 5 are the same as those of Example 2, except that this Comparative Example 5 uses silver powder with a bonding amount of 5% in the base powder coating.
本申请依据下列测试标准对各实施例以及比较例得到的汽车轮毂(包括底中合一涂层以及丙烯酸透明粉罩光层)依据各大汽车厂家的企业标准等级要求进行了效果对比检测：According to the following test standards, this application has carried out a comparative test of the effects of the automobile wheels (including the bottom-in-one coating and acrylic transparent powder overcoat) obtained in each embodiment and comparative example according to the enterprise standard grade requirements of major automobile manufacturers:
表1测试项目的检测评价标准Table 1 Testing and evaluation standards of test items
Figure PCTCN2020127329-appb-000008
Figure PCTCN2020127329-appb-000008
表2检测结果对比表Table 2 Comparison table of test results
Figure PCTCN2020127329-appb-000009
Figure PCTCN2020127329-appb-000009
Figure PCTCN2020127329-appb-000010
Figure PCTCN2020127329-appb-000010
通过上表2的检测结果可看出，本实施例提供的轮毂底中合一用粉末涂料作为汽车轮毂的底中合一涂层，不仅与轮毂基材保持良好的附着力，同时可直接作为罩光透明粉的喷涂基材，不仅与罩光透明粉保持良好的附着力，重要的是，不会对罩光透明粉的流平效果造成负面影响，这也是最终在汽车轮毂厂家能够实现批量应用的轮毂底中合一涂层方案的技术关键。From the test results in Table 2 above, it can be seen that the hub bottom center-in-one powder coating provided in this example is used as the bottom center-in-one coating of automobile wheels, which not only maintains good adhesion with the hub substrate, but also can be directly used as The coating base material of the overcoat transparent powder not only maintains good adhesion with the overcoat transparent powder, but also does not negatively affect the leveling effect of the overcoat transparent powder. This is also the final batch of automobile wheel manufacturers. The technical key to the applied integrated coating solution in the hub bottom.
对于本领域技术人员而言，显然本发明不限于上述示范性实施例的细节，而且在不背离本发明的精神或基本特征的情况下，能够以其他的具体形式实现本发明。因此，无论从哪一点来看，均应将实施例看作是示范性的，而且是非限制性的，本发明的范围由所附权利要求而不是上述说明限定，因此旨在将落在权利要求的等同要件的含义和范围内的所有变化囊括在本发明内。不应将权利要求中的任何附图标记视为限制所涉及的权利要求。For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description, and therefore it is intended to fall within the claims. All changes within the meaning and scope of the equivalent elements of are included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.
此外，应当理解，虽然本说明书按照实施方式加以描述，但并非每个实施方式仅包含一个独立的技术方案，说明书的这种叙述方式仅仅是为清楚起见，本领域技术人员应当将说明书作为一个整体，各实施例中的技术方案也可以经适当组合，形成本领域技术人员可以理解的其他实施方式。In addition, it should be understood that although this specification is described in accordance with the implementation manners, not each implementation manner only includes an independent technical solution. This narration in the specification is only for clarity, and those skilled in the art should regard the specification as a whole The technical solutions in the various embodiments can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims (10)

  1. 一种轮毂底中合一用粉末涂料，其特征在于，包括混合为一体的基体粉末涂料和效果粉末涂料，其中，所述基体粉末涂料包括其酸值不高于60mgKOH/g的聚酯树脂和用于所述聚酯树脂固化的羟烷基酰胺，所述效果粉末涂料包括效果颜料，且至少部分效果颜料包覆有透明粉末涂料。An all-in-one powder coating for wheel hub bottom, which is characterized in that it comprises a base powder coating and an effect powder coating that are mixed as a whole, wherein the base powder coating includes a polyester resin whose acid value is not higher than 60mgKOH/g and The hydroxyalkyl amide used for curing the polyester resin, the effect powder coating includes an effect pigment, and at least part of the effect pigment is coated with a transparent powder coating.
  2. 如权利要求1所述的轮毂底中合一用粉末涂料，其特征在于，所述基体粉末涂料和效果粉末涂料通过干混混合。The all-in-one powder coating for the hub bottom according to claim 1, wherein the base powder coating and the effect powder coating are mixed by dry mixing.
  3. 如权利要求1所述的轮毂底中合一用粉末涂料，其特征在于，所述基体粉末涂料和效果粉末涂料通过熔融混合。The all-in-one powder coating for the hub bottom according to claim 1, wherein the base powder coating and the effect powder coating are mixed by melting.
  4. 如权利要求1所述的轮毂底中合一用粉末涂料，其特征在于，所述基体粉末涂料占所述轮毂底中合一用粉末涂料的重量份不低于50％，所述效果粉末涂料占所述轮毂底中合一用粉末涂料的重量份不低于1％。The in-one powder coating for the hub bottom of claim 1, wherein the base powder coating accounts for no less than 50% by weight of the powder coating for the hub bottom in one, and the effect powder coating It accounts for no less than 1% by weight of the all-in-one powder coating in the hub bottom.
  5. 如权利要求1所述的轮毂底中合一用粉末涂料，其特征在于，所述聚酯树脂的酸值范围为25-50mgKOH/g；和/或所述聚酯树脂在200℃温度下的粘度范围在2500-4500Pa.s。The all-in-one powder coating for the hub bottom according to claim 1, wherein the acid value of the polyester resin is in the range of 25-50 mgKOH/g; and/or the polyester resin is at a temperature of 200°C. The viscosity range is 2500-4500Pa.s.
  6. 如权利要求1所述的轮毂底中合一用粉末涂料，其特征在于，所述聚酯树脂占所述基体粉末涂料重量份范围为50-85％，所述羟烷基酰胺占所述基体粉末涂料的1-5％。The all-in-one powder coating for the hub bottom of claim 1, wherein the polyester resin accounts for 50-85% by weight of the base powder coating, and the hydroxyalkylamide accounts for the base. 1-5% of powder coating.
  7. 如权利要求1所述的轮毂底中合一用粉末涂料，其特征在于，所述效果颜料包括金属效果颜料和/或珠光颜料和/或干涉颜料。The all-in-one powder coating for the hub bottom according to claim 1, wherein the effect pigments include metallic effect pigments and/or pearlescent pigments and/or interference pigments.
  8. 如权利要求1所述的轮毂底中合一用粉末涂料，其特征在于，所述透明粉末涂料包括聚酯树脂和羟烷基酰胺。The all-in-one powder coating for the hub bottom according to claim 1, wherein the transparent powder coating comprises polyester resin and hydroxyalkylamide.
  9. 一种轮毂底中合一涂层，其特征在于，在汽车轮毂基材上喷涂如权利要求1-8之一所述的轮毂底中合一用粉末涂料，经过固化反应后成型得 到；且在所述底中合一涂层上喷涂透明粉末涂料，经过固化反应后成型得到罩光透明涂层，所述底中合一涂层位于所述轮毂基材与所述罩光透明涂层之间。A hub-bottom-in-one coating, which is characterized in that the hub-bottom-in-one powder coating according to any one of claims 1-8 is sprayed on an automobile hub substrate, which is formed after curing reaction; and The bottom-in-one coating is sprayed with a transparent powder coating, and after curing reaction, it is formed to obtain a gloss transparent coating, and the bottom-in-one coating is located between the hub substrate and the gloss transparent coating .
  10. 一种汽车轮毂，其特征在于，包括如权利要求9所述的轮毂底中合一涂层以及透明罩光层，所述轮毂底中合一涂层位于所述汽车轮毂基材与所述透明罩光层之间；所述透明罩光层采用在所述轮毂底中合一涂层上喷涂透明粉末涂料后固化成型。An automobile wheel hub, which is characterized by comprising the in-one coating in the hub bottom and a transparent overcoat layer as claimed in claim 9, wherein the in-one coating in the hub bottom is located on the base material of the automobile hub and the transparent overcoat layer. Between the overcoat layers; the transparent overcoat layer is formed by spraying a transparent powder coating on the integrated coating of the hub bottom and then curing.
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