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CN-121991582-A - Full solids UV curable coating composition

CN121991582ACN 121991582 ACN121991582 ACN 121991582ACN-121991582-A

Abstract

A fully solid UV curable coating composition is disclosed comprising a resin comprising a phenolic modified epoxy acrylic resin and a urethane acrylic resin and a monomer comprising two or more diacrylates. Also disclosed is a process for preparing the fully solid UV-curable coating composition comprising (1) mixing a resin, a portion of the monomer and optionally an auxiliary and a pigment to obtain a premix, and (2) adding another portion of the monomer and optionally an auxiliary to the premix of step (1). Further disclosed are substrates coated with the fully solid UV-curable coating compositions.

Inventors

  • PENG FEIFEI
  • WANG WEI
  • KANG LUHAO
  • WANG CHUANZENG
  • JIA YANHUA
  • LI GUISHENG
  • SONG LIMING

Assignees

  • PPG涂料(天津)有限公司

Dates

Publication Date
20260508
Application Date
20241104

Claims (20)

  1. 1. A fully solid UV curable coating composition comprising a resin and a monomer, wherein the resin comprises a phenolic modified epoxy acrylic resin and a urethane acrylic resin, and the monomer comprises two or more diacrylates.
  2. 2. The UV curable coating composition of claim 1, wherein the weight ratio of the phenolic modified epoxy acrylic resin to the urethane acrylic resin is from 0.15:1 to 17:1.
  3. 3. The UV-curable coating composition of claim 1 or 2, wherein the weight ratio of the phenolic-modified epoxy acrylic resin to the urethane acrylic resin is from 0.4:1 to 6:1.
  4. 4. A UV curable coating composition according to any one of claims 1 to 3, wherein the phenolic modified epoxy acrylic resin has a functionality of 2 to 3.
  5. 5. The UV-curable coating composition of any one of claims 1-4, wherein the urethane acrylic resin has a functionality of 1-2.
  6. 6. The UV-curable coating composition of any one of claims 1-5, wherein the monomer comprises tripropylene glycol diacrylate and 1, 6-hexanediol diacrylate.
  7. 7. The UV-curable coating composition of claim 6, wherein the weight ratio of tripropylene glycol diacrylate to 1, 6-hexanediol diacrylate is from 0.15:1 to 6:1.
  8. 8. The UV-curable coating composition of claim 6 or 7, wherein the weight ratio of tripropylene glycol diacrylate to 1, 6-hexanediol diacrylate is from 0.8:1 to 2:1.
  9. 9. The UV-curable coating composition of any one of claims 1-8, further comprising an initiator-based.
  10. 10. The UV-curable coating composition of claim 8, wherein the initiator comprises 1-hydroxy-cyclohexylphenyl ketone and/or 2, 2-dimethoxy-2-phenylacetophenone.
  11. 11. The UV-curable coating composition of any one of claims 1-10, further comprising 0.5-10 wt% by weight, based on the total weight of the coating composition, of an adhesion promoter and/or coupling agent.
  12. 12. The UV-curable coating composition of claim 11, wherein the adhesion promoter and/or coupling agent comprises a phosphate adhesion promoter, a silane coupling agent, a titanate coupling agent, and/or a zirconate coupling agent.
  13. 13. The UV-curable coating composition of any one of claims 1-12, further comprising 2-30 wt% of a pigment filler, based on the total weight of the coating composition.
  14. 14. The UV-curable coating composition of claim 13, wherein the pigment filler comprises silicate-based inorganic filler and/or metal oxide inorganic filler.
  15. 15. A method of preparing the full solids UV curable coating composition of any one of claims 1-14, comprising: (1) Mixing the resin, a portion of the monomer and optionally the auxiliary and pigment filler to obtain a premix, and (2) Adding another portion of the monomer and optional auxiliary to the premix of step (1).
  16. 16. The method of claim 15, wherein step (1) further comprises grinding the premix to a fineness of 35 μm or less.
  17. 17. A coated substrate comprising a substrate and the fully-solid UV-curable coating composition of any one of claims 1-14 coated on at least a portion of the substrate.
  18. 18. The coated substrate of claim 17, wherein the substrate comprises a metal substrate.
  19. 19. The coated substrate of claim 17 or 18, wherein the substrate comprises a portion of a battery.
  20. 20. The coated substrate of any one of claims 17-19, wherein the substrate comprises a pretreated substrate comprising laser milling and/or plasma treatment.

Description

Full solids UV curable coating composition Technical Field The invention relates to the field of coatings, in particular to a full-solid-content UV (ultraviolet) curing coating. Background With the rapid popularization of new energy electric vehicles in the global scope, automobile manufacturers pay more and more attention to the safety of batteries, and dielectric films are required to have the characteristics of high shear strength (LSS), good electrolyte resistance, long-term stability, high voltage resistance and the like. Currently, blue film cladding is a common battery dielectric solution. However, blue films are inferior in corner coverage, high pressure resistance, long term stability, LSS and adhesion, and have potential electrical leakage and fire hazards. Dielectric coatings are an alternative solution to traditional blue films. However, current commercial dielectric coatings generally contain organic solvents such as benzene and xylene. The powder coating needs to be cured at 130 ℃ or above, the curing time is over 20 minutes, and the application process is complex. Therefore, it is desirable to develop a dielectric coating that is low in solvents, easy to apply, and excellent in various mechanical properties. Disclosure of Invention The present inventors have made extensive studies with respect to the above technical problems and developed a full-solid UV-curable coating composition. The paint composition has low VOC, can be cured at normal temperature, has good corner covering effect, high LSS, high pressure resistance, good electrolyte resistance and environmental aging resistance, and can meet the application requirements of battery environments. The invention provides a full-solid UV-curable coating composition, which comprises a resin and a monomer, wherein the resin comprises phenolic modified epoxy acrylic resin and polyurethane acrylic resin, and the monomer comprises two or more diacrylates. The invention also provides a preparation method of the full-solid UV curing coating composition, which comprises the following steps: (1) Mixing the resin, a portion of the monomer and optionally the auxiliary and pigment filler to obtain a premix, and (2) Adding another portion of the monomer and optional auxiliary to the premix of step (1). The invention further provides a coated substrate comprising a substrate and the fully solid UV-curable coating composition coated on at least a portion of the substrate. The features and advantages of the present invention will be presented in more detail in the following detailed description of the embodiments. Detailed Description As used herein, unless otherwise expressly indicated, all numerical values such as numerical values, ranges, amounts, or percentages used in the specification and claims are to be understood as being modified in all instances by the term "about" even though that term is not expressly shown. Accordingly, unless indicated to the contrary, the numerical parameters set forth in the specification and attached claims are approximations that may vary depending upon the desired properties sought to be obtained by the present invention. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the invention are approximations, the numerical values set forth in the specific examples are reported as precisely as possible. Any one value inherently has certain errors. This error is a necessary consequence of the standard deviation that is derived in its corresponding measurement method. Furthermore, it should be understood that any numerical range recited herein is intended to include all sub-ranges subsumed therein. For example, a range of "1 to 10" is intended to include all subranges between (and including) the minimum value of 1 and the maximum value of 10, i.e., having a minimum value equal to or greater than 1 and a maximum value of equal to or less than 10. In the present application, the use of the singular includes the plural and plural encompasses singular, unless explicitly stated otherwise. Furthermore, in the present application, "or" is used to mean "and/or" unless explicitly stated otherwise, even though "and/or" may be explicitly used in certain instances. In addition, in the present application, the use of "a" or "an" means "at least one" unless explicitly stated otherwise. For example, "a" resin, "a" coating, etc., refers to any one or more of these items. Also, as will be appreciated by those skilled in the art, features of one embodiment may be used with other embodiments, even if not explicitly stated. In the present application, "comprising" and similar terms are meant to include, but not be limited to, it does not exclude any variants or additions. Furthermore, although the present application has been described in terms of "comprising" and the like, the coating compositions and/or methods and the like detailed herein may also be described as "consisting essentially of. As described abov