WO2022143403A1 - 一种平面粉末涂料组合物及其涂层 - Google Patents

一种平面粉末涂料组合物及其涂层 Download PDF

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Publication number
WO2022143403A1
WO2022143403A1 PCT/CN2021/140853 CN2021140853W WO2022143403A1 WO 2022143403 A1 WO2022143403 A1 WO 2022143403A1 CN 2021140853 W CN2021140853 W CN 2021140853W WO 2022143403 A1 WO2022143403 A1 WO 2022143403A1
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coating composition
powder coating
flat powder
flat
curing
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PCT/CN2021/140853
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English (en)
French (fr)
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付光明
戴天贺
开卫华
骆飚
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老虎表面技术新材料（苏州）有限公司
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Priority to EP21914140.5A priority Critical patent/EP4273198A1/en
Publication of WO2022143403A1 publication Critical patent/WO2022143403A1/zh

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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
    • 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
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D133/04—Homopolymers or copolymers of esters
    • C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09D133/062—Copolymers with monomers not covered by C09D133/06
    • C09D133/068—Copolymers with monomers not covered by C09D133/06 containing glycidyl groups
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2312/00—Crosslinking

Definitions

  • the invention belongs to the field of powder coatings, in particular to a flat powder coating composition, and also relates to a flat coating prepared by applying the flat powder coating composition.
  • the applicant wishes to seek a technical solution to achieve the effect of a flat coating film on the basis of low temperature curing.
  • the object of the present invention is to provide a flat powder coating composition and its coating, which can complete the cross-linking and curing under the condition that the curing temperature is not higher than 140°C and the curing time is not more than 10 minutes, and the PCI flow is obtained at the same time.
  • a flat powder coating composition comprising a high-acid-value polyester resin and an epoxy group-bearing acrylic resin for cross-linking and curing reaction; wherein, the viscosity of the high-acid-value polyester resin at a temperature of 200°C is in the range of 500-2000mPa.s, and its acid value is not less than 65mgKOH/g.
  • the epoxy group-bearing acrylic resin is GMA acrylic resin.
  • the acid value of the high acid value polyester resin is in the range of 70-90 mgKOH/g.
  • the viscosity of the epoxy group-bearing acrylic resin at a temperature of 200° C. is not higher than 2000 mPa.s.
  • the epoxy equivalent range of the epoxy group-bearing acrylic resin is not higher than 600 g/eq.
  • the weight ratio between the high acid value polyester resin and the epoxy group-bearing acrylic resin is 6:1-1:6.
  • a leveling agent is also included in an amount of 0.2-2 wt% of the flat powder coating composition; the leveling agent includes a carboxyl-functional acrylic polymer adsorbed on a siliceous powder carrier.
  • a defoaming agent is also included in an amount of 0.2-2 wt% of the flat powder coating composition; the defoaming agent includes an amide-modified phenol surfactant.
  • the dispersant in an amount of 0.2-2wt% of the flat powder coating composition; the dispersant includes a high molecular polymer with a pigment affinity group, and the high molecular polymer is adsorbed on the siliceous powder carrier .
  • the above-mentioned flat powder coating composition is sprayed on the substrate and heated and cured.
  • the base material is a wood base material or a polymer material
  • the curing temperature is not higher than 140° C.
  • the curing time is not more than 10 minutes.
  • the GMA involved in this application is the abbreviation of Glycidyl methacylate, and its Chinese meaning refers to: glycidyl methacrylate; MDF is the abbreviation of Medium Density Fiberboard, and its Chinese meaning refers to: medium density fiberboard.
  • the plane involved in this application means that the PCI leveling level of the coating film is not lower than level 6, preferably not lower than level 7.
  • the PCI leveling level involved in this application specifically refers to the leveling of the coating film to be tested and the PCI level.
  • the level control board (level 0-10) is used for visual comparison to determine the leveling level corresponding to the coating film to be tested, which is a common leveling level determination method in the industry.
  • testing standard on which the acid value data involved in this application is based is GB/T 2895-2008; the testing standard on which the viscosity data involved is based is GB/T 22314-2008; the epoxy equivalent data involved The testing standard on which it is based is GB/T 4612-2008.
  • the present application creatively selects polyester resins with high acid value and low viscosity and acrylic resins with epoxy groups as the main raw materials of the powder coating composition.
  • a cross-linking and curing reaction with high reactivity will occur between them, and the low-viscosity resin raw material will give excellent melt leveling performance during the process of melting and cross-linking and curing reaction, so that the curing temperature of the overall powder coating composition system is not higher than
  • the cross-linking curing is completed at 140°C and the curing time is not more than 10 minutes, and at the same time, a flat effect cured coating film with a PCI leveling level of not less than 6 is obtained.
  • This embodiment proposes a flat powder coating composition, comprising a high-acid-value polyester resin and an epoxy group-bearing acrylic resin for cross-linking and curing reaction; wherein, the high-acid-value polyester resin is heated at a temperature of 200° C.
  • the viscosity range is 500-2000mPa.s, more preferably 500-1500mPa.s, and its acid value is not less than 65mgKOH/g, preferably 70-90mgKOH/g, more preferably 75-85mgKOH/g;
  • GMA acrylic resin is used as the acrylic resin with epoxy groups, and the viscosity of the acrylic resin with epoxy groups at 200°C is not higher than 2000 mPa.s, more preferably 500-2000 mPa.s, and further It is preferably 500-1500mPa.s; the epoxy equivalent range of the acrylic resin with epoxy groups is not higher than 600g/eq, more preferably 300-550g/eq, still more preferably 350-500g/eq, and still further It is preferably 400-450 g/eq.
  • the weight ratio between the high acid value polyester resin and the acrylic resin with epoxy groups is 6:1-1:6, more preferably 6:1-1:1, It is more preferably 3:1-3:2, and still more preferably 2.5:1-2:1, which can further facilitate the effect of rapid melting and leveling and rapid solidification.
  • the flat powder coating composition further comprises a leveling agent in an amount of 0.2-2 wt % of the flat powder coating composition, a defoamer in an amount of 0.2-2 wt % in the flat powder coating composition, and a flat powder in an amount of 0.2-2 wt %.
  • leveling agent includes carboxyl-functional acrylic polymer adsorbed on siliceous powder carrier, specifically RESIFLOW P-64F sold by ESTRON or other leveling agent with similar effect can be selected ;
  • Defoamers include amide-modified phenol surfactants, specifically POWDERMATE 550DG from Troy or defoamers with similar effects;
  • dispersants include high molecular polymers with pigment affinity groups, which adsorb On the siliceous powder carrier, BYK-3951P sold by BYK or other dispersants with similar effects can be selected, and a suitable weight of degassing agent or other auxiliary agents can also be included, and a certain weight can also be added according to actual needs. amount of pigments.
  • the curing agent can be selected from TGIC triglycidyl isocyanurate, Primid hydroxyalkylamide, isocyanate compounds (including various isocyanate compounds, specifically including blocked isocyanates, blocked isocyanates, Latent isocyanate and isocyanate compounds such as urea dione, etc.), DDDA dodecanedioic acid, sebacic acid, any one or more of them, the weight ratio of which can be added is preferably 0.05-6wt%, more preferably 0.5-3wt% %; Pigments and/or fillers, such as aluminum hydroxide, TiO 2 , etc.
  • TGIC triglycidyl isocyanurate Primid hydroxyalkylamide
  • isocyanate compounds including various isocyanate compounds, specifically including blocked isocyanates, blocked isocyanates, Latent isocyanate and isocyanate compounds such as urea dione, etc.
  • DDDA dodecanedioic acid se
  • the added weight ratio can preferably be 1-30 wt%, and the added weight ratio can be conventionally selected according to actual needs.
  • the catalyst can use various well-known curing accelerators (including imidazoles, ammonium and other curing accelerators). catalyst), which can further improve the reaction activity, and the weight ratio of the catalyst added can be preferably 0.1-3wt%, more preferably 0.1-2wt%, and even more preferably 0.3-1wt%.
  • the above raw material formulations are respectively prepared by known process preparation technology to obtain the flat powder coating composition.
  • the known process preparation technology usually includes: weighing, premixing, melt extrusion, powder milling, cyclone separation and other processes to prepare, of course, other processes can also be used.
  • the flat powder coating composition of this embodiment can be obtained by a known preparation process, and the preparation process thereof is not particularly limited in this application.
  • This embodiment also proposes a flat coating.
  • the above flat powder coating composition is sprayed on the base material and then heated and cured to form; preferably, the base material is a wood base material or a polymer material.
  • the thickness of the flat coating in this embodiment can be specifically selected according to actual needs, and the recommended coating thickness range is 60-120 ⁇ m (the test standard is based on: ISO 2360-2017).
  • the application has specially carried out the following multiple groups of examples as the formulation raw materials of the flat powder coating composition to carry out specific test performance comparisons:
  • Example 1 a flat powder coating composition, using the raw materials shown in Table 1 below:
  • Example 2 a flat powder coating composition, using the raw materials shown in Table 2 below:
  • Example 3 a flat powder coating composition, using the raw materials shown in Table 3 below:
  • Example 4 a flat powder coating composition, using the raw materials shown in Table 4 below:
  • Example 5 a flat powder coating composition, using the raw materials shown in Table 5 below:
  • Example 6 A flat powder coating composition, using the raw materials shown in Table 6 below:
  • Example 7 a flat powder coating composition, using the raw materials shown in Table 7 below:
  • Example 8 A flat powder coating composition, using the raw materials shown in Table 8 below:
  • Example 9 a flat powder coating composition, using the raw materials shown in Table 9 below:
  • Example 10 A flat powder coating composition, using the raw materials shown in Table 10 below:
  • Example 11 A flat powder coating composition, using the raw materials shown in Table 11 below:
  • Example 12 A flat powder coating composition using the raw materials shown in Table 12 below:
  • Comparative Example 1 This Comparative Example 1 uses the raw materials shown in Table 13 below:
  • Comparative Example 2 This Comparative Example 2 uses the raw materials shown in Table 14 below:
  • Comparative Example 3 This Comparative Example 3 uses the raw materials shown in Table 15 below:
  • Comparative Example 4 This Comparative Example 4 uses the raw materials shown in Table 16 below:
  • Comparative Example 5 This Comparative Example 5 uses the raw materials shown in Table 17 below:
  • Comparative Example 6 This Comparative Example 6 uses the raw materials shown in Table 18 below:
  • polyester resin TM5013 of Zhejiang Chuanhua Tiansong involved in this example has an acid value of 75-85 mgKOH/g, a softening point temperature of 90-110 °C, and a glass transition temperature of 48-54 °C.
  • the viscosity at °C is 500-2000mPa.s; the acid value of Crylcoat 2671-3 involving ALLNEX is 45-51mgKOH/g, the glass transition temperature is about 58°C, and the viscosity range at 200°C is 4300-7300mPa.s ;
  • the acid value of SJ3B of Excalibur involved is 68-75mgKOH/g, the softening point temperature is 105-115°C, the glass transition temperature is about 53°C, and the viscosity range at 200°C is 3500-5000mPa.s;
  • the epoxy equivalent of GMA1618 of Ningbo Nanhai Chemical is 400-430g/eq, and the softening point temperature is 92-97°C;
  • the softening point temperature is 120-130 °C.
  • powder coatings are respectively obtained in the present application through the same procedures (known process preparation technology) as weighing, premixing, melt extrusion, milling, and cyclone separation. .
  • Example 1 the powder coating prepared in Example 1 was used, and the gelation time was detected under the infrared curing condition of 135°C, and the gelation time was 160s; and MDF was used as the base material, and three curing conditions were set respectively: at 120°C Infrared curing for 10 minutes, infrared curing at 130 °C for 7 minutes, and infrared curing at 135 °C for 5 minutes, respectively, to obtain flat coatings.
  • the performance test comparison results are shown in Table 19:
  • the results show that under the curing temperature of 120°C-135°C and curing time of 5-15min in the infrared mode, the coating films show good surface resistance and flat effect. Among them, the flat effect cured at 135°C for 5 minutes is better.
  • hot air circulation curing conditions can also be selected, and similar technical effects can be achieved.
  • the flat powder coating compositions provided in this example can all be applied as flat coating products for MDF, solid wood boards and polymer plastic boards, and can achieve excellent flat coating effects.
  • Examples 1-12 After comparative tests, it is found that the flat powder coating compositions provided in Examples 1-12 have good substrate adhesion to the MDF substrate surface; at the same time, rapid curing under low temperature conditions is achieved, which not only satisfies the requirements of powder coating coatings for The basic performance of coating protection effectively avoids the serious shrinkage of the coating film caused by the rapid evaporation of water on the MDF sheet, as well as the deformation and cracking of the sheet. Further, in Examples 1-12 of the present application, Examples 1, 2, 3, 9, 10 and 11 have better coating film PCI leveling performance, and the coating films of Example 4 and Example 8 have better PCI leveling performance. The grade performance was second, and the coating films of Examples 5, 6, 7 and 12 performed relatively worse in the PCI leveling grade.
  • Test items Implement test standards gel time ISO 8130-6:1992 cross ISO 2409-2013 impact ISO 6272-1-2011, 2-2011 bending ISO 1519-2011 Cupping ISO 1520-2006 MEK test GB/T 23989-2009 dry heat BS EN 12722-2009 damp heat BS EN 12721-2009

Abstract

本发明公开了一种平面粉末涂料组合物及其涂层，包括进行交联固化反应的高酸值聚酯树脂和带环氧基团的丙烯酸树脂；其中，高酸值聚酯树脂在200℃温度下的粘度范围为500-2000mPa.s，且其酸值不低于65mgKOH/g；本发明在固化温度不高于140℃且固化时间不超过10分钟的条件下完成交联固化，同时获得了PCI流平等级不低于6级的平面效果固化涂膜。

Description

一种平面粉末涂料组合物及其涂层
本申请要求于2020年12月29日提交中国国家知识产权局专利局，申请号为“2020115995840”、发明名称为“一种平面粉末涂料组合物及其涂层”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。
技术领域
本发明属于粉末涂料领域，具体涉及一种平面粉末涂料组合物，本发明还涉及了应用该平面粉末涂料组合物制备得到的平面涂层。
背景技术
实现对木质基材或其他高分子材料材质类基材的平面化涂装一直是粉末涂料行业的技术难题，这是由于木质基材或其他高分子材料材质类基材均具有热敏性质，要求在较低温度以及较短的时间内完成交联固化，无法给常规的粉末涂料提供足够的熔融流平时间，因而其涂膜无法实现良好的流平效果，因此，现有的低温固化粉末涂料均被制成各种砂纹涂膜效果。
因此，本申请人希望寻求技术方案来实现低温固化的基础上，同时获得平面涂膜效果。
发明内容
有鉴于此，本发明的目的在于提供一种平面粉末涂料组合物及其涂层，在固化温度不高于140℃且固化时间不超过10分钟的条件下完成交联固化，同时获得了PCI流平等级不低于6级的平面效果固化涂膜。
本发明采用的技术方案如下：
一种平面粉末涂料组合物，包括进行交联固化反应的高酸值聚酯树脂和带环氧基团的丙烯酸树脂；其中，所述高酸值聚酯树脂在200℃温度下的粘度范围为500-2000mPa.s，且其酸值不低于65mgKOH/g。
优选地，所述带环氧基团的丙烯酸树脂采用GMA丙烯酸树脂。
优选地，所述高酸值聚酯树脂的酸值范围为70-90mgKOH/g。
优选地，所述带环氧基团的丙烯酸树脂在200℃温度下的粘度不高于2000mPa.s。
优选地，所述带环氧基团的丙烯酸树脂的环氧当量范围不高于600g/eq。
优选地，所述高酸值聚酯树脂和带环氧基团的丙烯酸树脂之间的重量份比例为6:1-1:6。
优选地，还包括占所述平面粉末涂料组合物0.2-2wt％的流平剂；所述流平剂包括吸附在硅质粉末载体上的羧基功能丙烯酸聚合物。
优选地，还包括占所述平面粉末涂料组合物0.2-2wt％的消泡剂；所述消泡剂包括酰胺改性苯酚表面活性剂。
优选地，还包括占所述平面粉末涂料组合物0.2-2wt％的分散剂；所述分散剂包括具有颜料亲和基团的高分子聚合物，该高分子聚合物吸附在硅质粉末载体上。
优选地，一种平面涂层，在基材上喷涂如上所述的平面粉末涂料组合物并进行加热固化成型。
优选地，所述基材采用木质基材或高分子材料，所述固化温度不高于140℃，所述固化时间不超过10分钟。
本申请涉及的GMA是Glycidyl methacylate的缩写，其中文意思是指：甲基丙烯酸缩水甘油酯；MDF是Medium Density Fiberboard的缩写，其中文意思是指：中密度纤维板。本申请涉及的平面是指其涂膜PCI流平等级不低于6级，优选为不低于7级，其中，本申请涉及的PCI流平等级具体是指将待测涂膜与PCI流平等级对照板(0-10级)进行目视对照判定出待测涂膜对应的流平等级，属于行业内通行的流平等级判定方法。
还需要说明的是，本申请涉及的酸值数据所依据的检测标准依为GB/T  2895-2008；涉及的粘度数据所依据的测试标准为GB/T 22314-2008；涉及的环氧当量数据所依据的检测标准为GB/T 4612-2008。
本申请创造性地选用高酸值且低粘度的聚酯树脂和带环氧基团的丙烯酸树脂作为粉末涂料组合物的主体原料，由于高酸值聚酯树脂和丙烯酸树脂的带环氧基团之间会发生高反应活性的交联固化反应，同时低粘度的树脂原料在进行熔融发生交联固化反应过程中，给予优异的熔融流平性能，使得整体粉末涂料组合物体系在固化温度不高于140℃且固化时间不超过10分钟的条件下完成交联固化，同时获得了PCI流平等级不低于6级的平面效果固化涂膜。
具体实施方式
本实施例提出了一种平面粉末涂料组合物，包括进行交联固化反应的高酸值聚酯树脂和带环氧基团的丙烯酸树脂；其中，高酸值聚酯树脂在200℃温度下的粘度范围为500-2000mPa.s，更优选为500-1500mPa.s，且其酸值不低于65mgKOH/g，优选为70-90mgKOH/g，更优选为75-85mgKOH/g；优选地，在本实施方式中，带环氧基团的丙烯酸树脂采用GMA丙烯酸树脂，带环氧基团的丙烯酸树脂在200℃温度下的粘度不高于2000mPa.s，更优选为500-2000mPa.s，进一步优选为500-1500mPa.s；带环氧基团的丙烯酸树脂的环氧当量范围不高于600g/eq，更优选为300-550g/eq，更进一步优选为350-500g/eq，再更进一步优选为400-450g/eq。
优选地，在本实施方式中，高酸值聚酯树脂和带环氧基团的丙烯酸树脂之间的重量份比例为6:1-1:6，更优选为6:1-1:1，更进一步优选为3:1-3:2，再更进一步优选为2.5：1-2：1，可以进一步利于快速熔融流平以及快速固化效果。
优选地，在本实施方式中，平面粉末涂料组合物还包括占平面粉末涂料组合物0.2-2wt％的流平剂，占平面粉末涂料组合物0.2-2wt％的消泡剂，以及 占平面粉末涂料组合物0.2-2wt％的分散剂；其中，流平剂包括吸附在硅质粉末载体上的羧基功能丙烯酸聚合物，具体可以选用ESTRON销售的RESIFLOW P-64F或具有类似效果的其他流平剂；消泡剂包括酰胺改性苯酚表面活性剂，具体可以选用特洛伊的POWDERMATE 550DG或具有类似效果的消泡剂；分散剂包括具有颜料亲和基团的高分子聚合物，该高分子聚合物吸附在硅质粉末载体上，具体可以选用BYK销售的BYK-3951P或具有类似效果的其他分散剂，也还可以包括合适重量份的脱气剂或其他助剂，也可以根据实际需要，添加一定重量份的颜填料。
在本发明实施方式中，可以选择在本申请提出的优选参数范围内的其他重量份比例原料分别作为本申请平面粉末涂料组合物的配方，均可以获得基本相似的技术效果，本申请人还通过大量实施应用对比结合公知常识以及研发经验，发现采用在本申请优选参数范围外的重量份原料作为涂料配方来实施应用时，其在涂层综合性能表现要明显弱于在本申请优选参数范围内的实施例，但可能也会有一定的积极技术效果。
还需要说明的是，根据实际应用需要本实施例提出的消光超低温固化粉末涂料组合物原料还可以添加各种公知的固化剂和/或颜料和/或填料和/或催化剂和/或其他助剂，其中优选地，固化剂可以选用TGIC异氰脲酸三缩水甘油酯、Primid羟烷基酰胺、异氰酸酯化合物(包括各种异氰酸的酯类化合物，具体包括封闭型异氰酸酯、封端型异氰酸酯、潜伏型异氰酸酯和尿素二酮等异氰酸酯化合物等)、DDDA十二烷二酸、癸二酸中的任意一种或几种，其添加重量比例可以优选为0.05-6wt％，更优选为0.5-3wt％；颜料和/或填料，例如可以选用氢氧化铝、TiO 2等，其添加重量比例可以优选为1-30wt％，可根据实际需要进行常规选择添加重量比例,需要说明的是：为了利于获得更好的流平效果，不建议添加过多填料，最好不要向粉末涂料组合物中添加填料；催化剂可具体采用各种公知的固化促进剂(可包括咪唑类、铵类等各类固化 促进剂)，可进一步提高反应活性，催化剂添加重量比例可以优选为0.1-3wt％，更优选为0.1-2wt％，更进一步优选为0.3-1wt％。
将以上原料配方通过公知工艺制备技术分别得到平面粉末涂料组合物，公知工艺制备技术通常包括：称量、预混、熔融挤出、磨粉、旋风分离等工序后制备得到，当然也可以采用其他公知制备工艺来得到本实施例的平面粉末涂料组合物，本申请对其制备工艺没有特别限定之处。
本实施例还提出了一种平面涂层，在基材上喷涂如上的平面粉末涂料组合物并进行加热固化成型；优选地，基材采用木质基材或高分子材料，也可以为其他具有类似涂装需求的热敏性基材；固化温度不高于140℃，固化时间不超过10分钟。本实施例的平面涂层厚度可以根据实际需要进行具体选择，建议的涂层厚度范围为60-120μm(测试标准依据为：ISO 2360-2017)。
为了验证本申请实施时的技术效果，本申请特别进行了以下多组实施例作为平面粉末涂料组合物的配方原料进行具体测试性能对比：
实施例1：一种平面粉末涂料组合物，采用如下表1所示的原料：
表1 实施例1中平面粉末涂料组合物的配方
Figure PCTCN2021140853-appb-000001
实施例2：一种平面粉末涂料组合物，采用如下表2所示的原料：
表2 实施例2中平面粉末涂料组合物的配方
Figure PCTCN2021140853-appb-000002
实施例3：一种平面粉末涂料组合物，采用如下表3所示的原料：
表3 实施例3中平面粉末涂料组合物的配方
Figure PCTCN2021140853-appb-000003
实施例4：一种平面粉末涂料组合物，采用如下表4所示的原料：
表4 实施例4中平面粉末涂料组合物的配方
Figure PCTCN2021140853-appb-000004
Figure PCTCN2021140853-appb-000005
实施例5：一种平面粉末涂料组合物，采用如下表5所示的原料：
表5 实施例5中平面粉末涂料组合物的配方
Figure PCTCN2021140853-appb-000006
实施例6：一种平面粉末涂料组合物，采用如下表6所示的原料：
表6 实施例6中平面粉末涂料组合物的配方
Figure PCTCN2021140853-appb-000007
实施例7：一种平面粉末涂料组合物，采用如下表7所示的原料：
表7 实施例7中平面粉末涂料组合物的配方
Figure PCTCN2021140853-appb-000008
实施例8：一种平面粉末涂料组合物，采用如下表8所示的原料：
表8 实施例8中平面粉末涂料组合物的配方
Figure PCTCN2021140853-appb-000009
实施例9：一种平面粉末涂料组合物，采用如下表9所示的原料：
表9 实施例9中平面粉末涂料组合物的配方
Figure PCTCN2021140853-appb-000010
Figure PCTCN2021140853-appb-000011
实施例10：一种平面粉末涂料组合物，采用如下表10所示的原料：
表10 实施例10中平面粉末涂料组合物的配方
Figure PCTCN2021140853-appb-000012
实施例11：一种平面粉末涂料组合物，采用如下表11所示的原料：
表11 实施例11中平面粉末涂料组合物的配方
Figure PCTCN2021140853-appb-000013
实施例12：一种平面粉末涂料组合物，采用如下表12所示的原料：
表12 实施例12中平面粉末涂料组合物的配方
Figure PCTCN2021140853-appb-000014
对比例1：本对比例1采用如下表13所示的原料：
表13 对比例1的原料配方
Figure PCTCN2021140853-appb-000015
对比例2：本对比例2采用如下表14所示的原料：
表14 对比例2的原料配方
原料类型 重量份 具体原料型号
高粘聚酯树 600 在200℃温度下的粘度范围为2200-2800
    mPa.s
GMA丙烯酸树脂 365 采用来自宁波南海化学的GMA1618
流平剂 10 采用来自ESTRON的RESIFLOW P-64F
消泡剂 10 采用POWDERMATE 550DG
分散剂 10 采用来自BYK的BYK-3951P
脱气剂 5 采用来自宁波南海化学的GMA1618
总量 1000 /
对比例3：本对比例3采用如下表15所示的原料：
表15 对比例3的原料配方
Figure PCTCN2021140853-appb-000016
对比例4：本对比例4采用如下表16所示的原料：
表16 对比例4的原料配方
Figure PCTCN2021140853-appb-000017
对比例5：本对比例5采用如下表17所示的原料：
表17 对比例5的原料配方
原料类型 重量份 具体原料型号
高酸值高粘聚酯树脂 865 采用来自神剑的SJ3B
GMA丙烯酸树脂 100 采用来自宁波南海化学的GMA1618
流平剂 10 采用来自ESTRON的RESIFLOW P-64F
消泡剂 10 采用POWDERMATE 550DG
分散剂 10 采用来自BYK的BYK-3951P
脱气剂 5 采用来自埃斯特伦的OXYMELT A4
总量 1000 /
对比例6：本对比例6采用如下表18所示的原料：
表18 对比例6的原料配方
Figure PCTCN2021140853-appb-000018
需要说明的是，本实施例涉及的浙江传化天松的聚酯树脂TM5013的酸值为75-85mgKOH/g，软化点温度为90-110℃，玻璃化温度为48-54℃，在200℃下的粘度为500-2000mPa.s；涉及ALLNEX的Crylcoat 2671-3的酸值为45-51mgKOH/g，玻璃化温度约为58℃，在200℃温度下的粘度范围为4300-7300mPa.s；涉及的神剑的SJ3B的酸值为68-75mgKOH/g，软化点温度为105-115℃，玻璃化温度约为53℃，在200℃温度下的粘度范围为3500-5000mPa.s；涉及的宁波南海化学的GMA1618的环氧当量为400-430g/eq，软化点温度为92-97℃；涉及的中添的GMA树脂T-700的环氧当量为710-740g/eq， 软化点温度为软化点温度为120-130℃。
本申请按以上各实施例1-12以及对比例1-6提出的原料配方通过相同的称量、预混、熔融挤出、磨粉、旋风分离等工序(公知工艺制备技术)分别得到粉末涂料。
一、首先采用实施例1制得的粉末涂料，在135℃红外固化条件下进行胶化时间检测，其胶化时间为160s；并以MDF作为基材，分别设置三个固化条件：120℃下红外固化10分钟、130℃下红外固化7分钟、135℃下红外固化5分钟，分别得到平面涂层，性能测试对比结果如下表19：
表19 不同固化条件下的涂层性能测试对比
Figure PCTCN2021140853-appb-000019
通过上表19可看出，结果表明在红外方式下的固化温度为120℃-135℃，固化时间为5-15min的固化条件下，涂膜均表现出很好的表面抗性以及平面效果，其中，在135℃下固化5分钟的平面效果更佳。当然地，也可以选择热风循环式固化条件，可以取得类似的技术效果。
二、采用实施例1制得的粉末涂料，分别选择MDF板、实木板以及高分 子聚合塑料板作为基材，在135℃下红外固化5分钟，分别得到平面涂层，性能测试对比结果如下表20：
表20 不同基材的涂层性能测试对比
Figure PCTCN2021140853-appb-000020
通过上表20可看出，本实施例提供的平面粉末涂料组合物均可以应用作为MDF，实木板以及高分子聚合塑料板的平面涂装产品，可以实现优异的平面涂膜效果。
三、最后分别采用实施例1-12以及比较例1-6制得的粉末涂料组合物，选取相同规格的MDF作为基材，在135℃下红外固化5分钟，分别得到平面涂层，性能测试对比结果如下表21：
表21 各组实施例以及对比例的性能测试对比
Figure PCTCN2021140853-appb-000021
Figure PCTCN2021140853-appb-000022
经过对比测试后发现，本实施例1-12提供的平面粉末涂料组合物与MDF基材表面具有良好的基材附着力；同时实现了低温条件下的快速固化，既满足粉末涂料涂层用于涂装防护的基本性能，又有效避免了MDF板材水分急速蒸发而导致的涂膜严重缩孔以及板材变形、开裂问题，获得了PCI流平等级不低于6级的平面效果固化涂膜。进一步来说，在本申请例1-12中，实施例1、2、3、9、10以及11具有更好涂膜PCI流平等级表现，实施例4以及实施例8的涂膜PCI流平等级表现次之，而实施例5、6、7以及12的涂膜PCI流平等级表现相对更差。
需要特别说明的是，本实施例涉及的涂层性能测试是依据下表22所述的测试标准进行的。
表22 测试项目和测试标准
测试项目 执行测试标准
胶化时间 ISO 8130-6:1992
划格 ISO 2409-2013
冲击 ISO 6272-1-2011、2-2011
弯曲 ISO 1519-2011
杯突 ISO 1520-2006
MEK测试 GB/T 23989-2009
干热 BS EN 12722-2009
湿热 BS EN 12721-2009
耐水 BS EN 12720-2009
耐酒精(48％) BS EN 12720-2009
耐咖啡 BS EN 12720-2009
液蜡 BS EN 12720-2009
需要特别说明的是，本领域技术人员同样可以将本申请提出的平面粉末涂料组合物应用于其他材质基材的涂装防护，可以获得与类似的平面涂层效果，本申请不再具体展开说明。
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。
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。

Claims (11)

  1. 一种平面粉末涂料组合物，其特征在于，包括进行交联固化反应的高酸值聚酯树脂和带环氧基团的丙烯酸树脂；其中，所述高酸值聚酯树脂在200℃温度下的粘度范围为500-2000mPa.s，且其酸值不低于65mgKOH/g。
  2. 根据权利要求1所述的平面粉末涂料组合物，其特征在于，所述带环氧基团的丙烯酸树脂采用GMA丙烯酸树脂。
  3. 根据权利要求1所述的平面粉末涂料组合物，其特征在于，所述高酸值聚酯树脂的酸值范围为70-90mgKOH/g。
  4. 根据权利要求1所述的平面粉末涂料组合物，其特征在于，所述带环氧基团的丙烯酸树脂在200℃温度下的粘度不高于2000mPa.s。
  5. 根据权利要求1所述的平面粉末涂料组合物，其特征在于，所述带环氧基团的丙烯酸树脂的环氧当量范围不高于600g/eq。
  6. 根据权利要求1所述的平面粉末涂料组合物，其特征在于，所述高酸值聚酯树脂和带环氧基团的丙烯酸树脂之间的重量份比例为6:1-1:6。
  7. 根据权利要求1所述的平面粉末涂料组合物，其特征在于，还包括占所述平面粉末涂料组合物0.2-2wt％的流平剂；所述流平剂包括吸附在硅质粉末载体上的羧基功能丙烯酸聚合物。
  8. 根据权利要求1所述的平面粉末涂料组合物，其特征在于，还包括占所述平面粉末涂料组合物0.2-2wt％的消泡剂；所述消泡剂包括酰胺改性苯酚表面活性剂。
  9. 根据权利要求1所述的平面粉末涂料组合物，其特征在于，还包括占所述平面粉末涂料组合物0.2-2wt％的分散剂；所述分散剂包括具有颜料亲和基团的高分子聚合物，该高分子聚合物吸附在硅质粉末载体上。
  10. 一种平面涂层，其特征在于，在基材上喷涂如权利要求1-9之一所述的平面粉末涂料组合物并进行加热固化成型。
  11. 根据权利要求10所述的平面涂层，其特征在于，所述基材采用木质基材或高分子材料，所述固化温度不高于140℃，所述固化时间不超过10分钟。
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