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US-12624222-B2 - Special powder coating for super weather-resistant composite, and preparation method thereof, and coating method

US12624222B2US 12624222 B2US12624222 B2US 12624222B2US-12624222-B2

Abstract

A special powder coating for a super weather-resistant composite, and a preparation method and use thereof, and a coating method are provided. The special powder coating for the super weather-resistant composite includes components of, in percentages by mass: 0% to 50% of a modified acrylate, 20% to 75% of a polyester resin, 15% to 20% of an isophorone diisocyanate (IPDI) adduct, 0.1% to 0.8% of a texturing agent, 4.3% to 22.7% of a transparent filler powder, 0.8% to 1.2% of a pigment, 0.1% to 0.2% of a toughening agent, 0.1% to 0.3% of nano-alumina, and 0% to 2% of a conductive agent, the components having a sum of mass percentages of 100%.

Inventors

  • Jiansen Zhang
  • Zhengyao Liu
  • Hao Chen
  • Aibin Xu

Assignees

  • NEWMAT (Beijing) Environmental Materials Tech Co.
  • Cangzhou NEWMAT Advanced Materials Technology Co.

Dates

Publication Date
20260512
Application Date
20241210
Priority Date
20240628

Claims (12)

  1. 1 . A special powder coating for a weather-resistant composite, comprising components of, in percentages by mass: 40% to 48% of a modified acrylate, 20% to 24% of a polyester resin, 15% to 20% of an adduct derived from isophorone diisocyanate (IPDI), 0.1% to 0.8% of a texturing agent, 4.3% to 22.7% of a transparent filler powder, 0.8% to 1.2% of a pigment, 0.1% to 0.2% of a toughening agent, 0.1% to 0.3% of alumina, and 0% to 2% of a conductive agent, the components having a sum of mass percentages of 100%; wherein the modified acrylate is polyurethane acrylate; the adduct derived from IPDI is a polyisocyanate adduct with &-Caprolactam blocked NCO-groups; and the polyester resin is a saturated carboxyl polyester resin.
  2. 2 . The special powder coating for the weather-resistant composite of claim 1 , comprising the components of, in percentages by mass: 40% to 48% of the modified acrylate, 20% to 24% of the polyester resin, 15% to 18% of the adduct derived from IPDI, 0.3% to 0.5% of the texturing agent, 7.1% to 8.2% of the transparent filler powder, 1% to 1.2% of the pigment, 0.15% to 0.2% of the toughening agent, 0.1% to 0.15% of the alumina, and 0.3% to 0.6% of the conductive agent.
  3. 3 . The special powder coating for the weather-resistant composite of claim 1 , further comprising a double-layer coated aluminum powder, wherein the double-layer coated aluminum powder in the special powder coating for the weather-resistant composite has a mass percentage of 0.5% to 5%.
  4. 4 . The special powder coating for the weather-resistant composite of claim 3 , wherein the double-layer coated aluminum powder has a particle size of 0.5 nm to 3 nm, and the double-layer coated aluminum powder is a layered double capsule, the layered double capsule being a non-floating aluminum powder double coated with silica and an acrylic resin.
  5. 5 . A method for preparing the special powder coating for the weather-resistant composite of claim 1 , comprising: mixing the modified acrylate, the polyester resin, the adduct derived from isophorone diisocyanate (IPDI), the texturing agent, the transparent filler powder, the pigment, the toughening agent, the alumina, and the conductive agent to obtain the special powder coating for the weather-resistant composite.
  6. 6 . The method of claim 5 , wherein under the condition that the special powder coating for the weather-resistant composite further comprises the double-layer coated aluminum powder, the method further comprises binding after the mixing is completed.
  7. 7 . The method of claim 5 , wherein the special powder coating comprises the components of, in percentages by mass: 40% to 48% of the modified acrylate, 20% to 24% of the polyester resin, 15% to 18% of the adduct derived from isophorone diisocyanate (IPDI), 0.3% to 0.5% of the texturing agent, 7.1% to 8.2% of the transparent filler powder, 1% to 1.2% of the pigment, 0.15% to 0.2% of the toughening agent, 0.1% to 0.15% of the alumina, and 0.3% to 0.6% of the conductive agent.
  8. 8 . The method of claim 5 , wherein the special powder coating comprises the components of, in percentages by mass: 68% to 76% of the polyester resin, 15% to 18% of the adduct derived from IPDI, 0.3% to 0.5% of the texturing agent, 7.1% to 8.2% of the transparent filler powder, 1% to 1.2% of the pigment, 0.15% to 0.2% of the toughening agent, 0.1% to 0.15% of the alumina, and 0.3% to 0.6% of the conductive agent.
  9. 9 . The method of claim 5 , wherein the special powder coating comprises a double-layer coated aluminum powder, wherein the double-layer coated aluminum powder in the special powder coating for the weather-resistant composite has a mass percentage of 0.5% to 5%.
  10. 10 . The method of claim 5 , wherein the double-layer coated aluminum powder has a particle size of 0.5 nm to 3 nm, and the double-layer coated aluminum powder is a layered double capsule, the layered double capsule being a non-floating aluminum powder double coated with silica and an acrylic resin.
  11. 11 . A coating method, comprising: subjecting a composite substrate to be coated to a surface treatment to obtain a pretreated composite substrate; preheating the pretreated composite substrate to obtain a preheated substrate; and spraying and curing a powder coating in sequence on a surface of the preheated substrate; wherein the preheating is conducted at a temperature of 80° C. to 170° C. for 6 min to 12 min, and the powder coating is the special powder coating for the weather-resistant composite of claim 1 .
  12. 12 . The coating method of claim 11 , further comprising spraying a conductive primer before spraying the powder coating, wherein the conductive primer is one selected from the group consisting of an epoxy resin powder conductive primer, an epoxy polyester conductive primer, a pure polyester powder conductive primer, a polyurethane (PU) powder conductive primer, and an acrylic powder conductive primer.

Description

CROSS REFERENCE TO RELATED APPLICATION This patent application claims the benefit and priority of Chinese Patent Application No. 202410851190.1 filed with the China National Intellectual Property Administration on Jun. 28, 2024, and entitled with “SPECIAL POWDER COATING FOR SUPER WEATHER-RESISTANT COMPOSITE, AND PREPARATION METHOD THEREOF, AND COATING METHOD”, the disclosure of which is incorporated by reference herein in its entirety as part of the present application. TECHNICAL FIELD The present disclosure relates to the technical field of powder coatings, and in particular relates to a special powder coating for a super weather-resistant composite, and a preparation method and use thereof, and a coating method. BACKGROUND A composite is a novel material that is composed of two or more materials by physical or chemical methods. The composite has excellent properties that cannot be matched by a single material, such as high strength, high stiffness, low density, and desirable dimensional stability and corrosion resistance, and therefore has been widely used in fields such as aerospace, automobile, electronics, and construction. However, the surface treatment of composites has always been a difficult problem, because the surface state of composites is very different from that of metal materials, such as low surface energy, a large amount of release agent residue on the surface, and uneven surface stress, resulting in a great impact on the effect of the surface treatment. A powder coating is suitable for metal surfaces and is a novel coating. The powder coating is a solid powder material composed of solid resin and pigment, filler, and additives, and is electrostatically sprayed, frictionally sprayed (thermosetting method), or dip-coated on a fluidized bed (thermoplastic method), and then heated, melted, and solidified to form a smooth, bright, and permanent coating film. The powder coating has advantages such as no solvent pollution, 100% film formation, low energy consumption, simple construction, high efficiency, safety without toxicity, and convenient storage and transportation. The prior art discloses that a powder coating is applied to a surface of the composite, for example by dip-coating on a fluidized bed (thermoplastic method) or spraying to apply the powder coating to a mold or a coated object. A resulting system is heated and pressurized, such that the powder is impregnated into the composite to form a protective film by hot press molding. Although the prior art has solved the problem of applying powder coatings to composite surfaces to some extent, there are still some problems and shortcomings. For example, the surface state of composites is very different from that of metallic materials, which results in poor adhesion of existing powder coatings on the surface of composites, causing them to peeling or falling off easily. SUMMARY In view of this, an object of the present disclosure is to provide a special powder coating for a super weather-resistant composite, and a preparation method and use thereof, and a coating method. The special powder coating provided by the present disclosure is suitable for a composite, has strong adhesion to the composite, and can form a smooth and defect-free coating on a surface of the composite. To achieve the above object, the present disclosure provides the following technical solutions: The present disclosure provides a special powder coating for a super weather-resistant composite, including components of, in percentages by mass: 0% to 50% of a modified acrylate, 20% to 75% of a polyester resin, 15% to 20% of an isophorone diisocyanate (IPDI) adduct, 0.1% to 0.8% of a texturing agent, 4.3% to 22.7% of a transparent filler powder, 0.8% to 1.2% of a pigment, 0.1% to 0.2% of a toughening agent, 0.1% to 0.3% of nano-alumina, and 0% to 2% of a conductive agent, the components having a sum of mass percentages of 100%. In some embodiments, the special powder coating for the super weather-resistant composite includes the components of, in percentages by mass: 40% to 48% of the modified acrylate, 20% to 24% of the polyester resin, 15% to 18% of the IPDI adduct, 0.3% to 0.5% of the texturing agent, 7.1% to 8.2% of the transparent filler powder, 1% to 1.2% of the pigment, 0.15% to 0.2% of the toughening agent, 0.1% to 0.15% of the nano-alumina, and 0.3% to 0.6% of the conductive agent. In some embodiments, the special powder coating for the super weather-resistant composite includes the components of, in percentages by mass: 68% to 76% of the polyester resin, 15% to 18% of the IPDI adduct, 0.3% to 0.5% of the texturing agent, 7.1% to 8.2% of the transparent filler powder, 1% to 1.2% of the pigment, 0.15% to 0.2% of the toughening agent, 0.1% to 0.15% of the nano-alumina, and 0.3% to 0.6% of the conductive agent. In some embodiments, the special powder coating for the super weather-resistant composite further includes a double-layer coated aluminum powder, wherein the doub