阅读说明：本技术 在低烘烤温度下涂覆纤维复合板的方法 (Method for coating fiber composite board at low baking temperature ) 是由 D·H·坎贝尔 C·韦德 于 2019-01-18 设计创作，主要内容包括：本发明涉及在纤维增强的复合材料上生产多层涂层的方法,该方法包括以下步骤：(i)将底漆组合物施涂到纤维增强的复合材料上以形成底漆层,并至少部分干燥底漆层,(ii)在底漆层上施涂底涂层组合物以形成底涂层,并至少部分干燥底涂层,(iii)(a)将第一透明涂料组合物1施涂到底涂层上以形成第一透明涂层1,并使在步骤i.,ii.中形成的层和第一透明涂层在至少80℃的温度下固化,然后将第二透明涂料组合物2施涂到如此固化的层上以形成透明涂层2,并且在大于25℃至小于60℃的温度下将透明涂层2固化10至40分钟,任选地,接着在至少80℃的温度下固化透明涂层2；或(iii)(b)将透明涂料组合物2直接施涂在底涂层上以形成单个透明涂层2,并在大于25℃至小于60℃的温度下将所述单个透明涂层2固化10至40分钟,然后在至少80℃的温度下固化底漆层,底涂层和透明涂层2。本发明还涉及一种可通过上述方法获得的涂覆有多层涂层的纤维增强的复合材料。(The invention relates to a method for producing a multilayer coating on a fiber-reinforced composite, comprising the following steps: (i) applying a primer composition onto the fiber-reinforced composite to form a primer layer and at least partially drying the primer layer, (ii) applying a basecoat composition onto the primer layer to form a basecoat layer and at least partially drying the basecoat layer, (iii) (a) applying a first clearcoat composition 1 onto the basecoat layer to form a first clearcoat layer 1, and curing the layer formed in steps i., ii. and the first clearcoat layer at a temperature of at least 80 ℃, then applying a second clearcoat composition 2 onto the so-cured layer to form a clearcoat layer 2, and curing the clearcoat layer 2 at a temperature of from greater than 25 ℃ to less than 60 ℃ for from 10 to 40 minutes, optionally followed by curing the clearcoat layer 2 at a temperature of at least 80 ℃; or (iii) (b) applying the clear coating composition 2 directly onto the basecoat layer to form a single clearcoat layer 2 and curing said single clearcoat layer 2 at a temperature of from greater than 25 ℃ to less than 60 ℃ for 10 to 40 minutes, followed by curing the primer layer, basecoat layer, and clearcoat layer 2 at a temperature of at least 80 ℃. The invention also relates to a fiber-reinforced composite material coated with a multilayer coating, obtainable by the above-described method.)

1. A method of producing a multilayer coating on a fiber-reinforced composite, comprising the steps of:

i. applying a primer composition to the fiber-reinforced composite to form a primer layer and at least partially drying the primer layer,

applying a basecoat composition over the primer layer to form a basecoat layer and at least partially drying the basecoat layer,

iii. (a) applying a first clear coating composition 1 onto the basecoat layer to form a first clear coating layer 1, and allowing the layer formed in steps i, ii and the first clear coating layer to cure at a temperature of at least 80 ℃, then applying a second clear coating composition 2 onto the so-cured layer to form a clear coating layer 2, and curing the clear coating layer 2 at a temperature of from greater than 25 ℃ to less than 60 ℃ for from 10 to 40 minutes; or

(b) The clear coating composition 2 is applied directly onto the basecoat layer to form a single clearcoat layer 2, and the single clearcoat layer 2 is cured at a temperature of from greater than 25 ℃ to less than 60 ℃ for 10 to 40 minutes, followed by curing of the primer layer, basecoat layer, and clearcoat layer 2 at a temperature of at least 80 ℃.

2. The method of claim 1, wherein the fiber reinforced composite comprises a polymer matrix and fibers.

3. The method according to any one of claims 1 or 2, wherein the primer composition is a one-pack coating composition or a two-pack coating composition; and/or the basecoat composition is a one-pack coating composition; and/or clear coating composition 1 is a one-pack coating composition or a two-pack coating composition; and/or clear coating composition 2 is a two-pack coating composition.

4. The method according to any one of claims 1 to 3, wherein the primer composition is a solvent-borne or water-borne coating composition; clear coating compositions 1 and 2 are solvent borne coating compositions; and/or the primer coating composition is a solvent borne or water borne coating composition.

5. The method according to any one of claims 1-4, wherein no mechanical roughening step, such as a sanding step, is required after curing the clear coat layer 1 in step iii (a).

6. A method according to claim 5, characterized in that no mechanical roughening step, such as a grinding step, is required in or after any of the steps of the method.

7. The method of any one of claims 1-6, wherein step iii. (a) is followed by a second cure at a temperature of at least 80 ℃ for a time of 10 to 40 minutes.

8. The method of any one of claims 1-7, wherein step iii. (b) cooling the coated fiber-reinforced composite to a temperature of from 23 ℃ to below the curing temperature of clearcoat layer 2 after curing the individual clearcoat layer 2 at a temperature of from greater than 25 ℃ to less than 60 ℃ for 10 to 40 minutes and before curing the primer layer, basecoat layer, and clearcoat layer 2 at a temperature of at least 80 ℃.

9. The method according to any one of claims 1 to 8, wherein the transparent coating layer 2 is cured at a temperature of 30 to 55 ℃ for 15 to 35 minutes, or at a temperature of 35 to 55 ℃ for 20 to 30 minutes.

10. The method according to any one of claims 3 or 4,

the primer composition is a water-based double-package composition or a solvent-based single-package composition;

the base coat composition is a water-based or solvent-based one-package composition; and

clear coating compositions 1 and 2 are solvent borne two-pack compositions.

11. The method of any one of claims 1-10, wherein

The primer composition and the basecoat composition comprise one or more polymeric polyols and one or more aminoplast resins; and/or

Clear coating composition 1 comprises one or more polymeric polyols and one or more isocyanate group-containing materials.

12. The method of any one of claims 1-11, wherein clear coating composition 2 comprises a masterbatch comprising a polymeric polyol and a curative comprising an isocyanate group-containing material.

13. The method of claim 12, wherein the polymeric polyol is selected from poly (meth) acrylate polyols and the isocyanate group-containing material is selected from diisocyanates, including biuret dimers and uretdione dimers of diisocyanates, and polyisocyanates, including trimers, such as isocyanurate trimers and iminooxadiazinedione trimers of diisocyanates.

14. The method of any one of claims 12 or 13, wherein the polymeric polyol has a weight average molecular weight, M, of 1,000 to 20,000g/mol as measured by gel permeation chromatography_wAnd/or exhibit a theoretical glass transition temperature in the range of-100 ℃ to 100 ℃ and/or exhibit a hydroxyl number in the range of 60 to 250mg KOH/g; and/or wherein one or more isocyanate groups in the isocyanate group-containing material react to introduce one or more hydrolysable silane groups into the isocyanate group-containing material.

15. A fiber-reinforced composite coated with a multilayer coating, obtainable according to the method of any one of claims 1 to 14.

Examples