Two-component-type primer, primer coating film, layered antifouling coating film, and method for preventing base material from being fouled
Provided is a two-component-type primer having good adhesive property with a base material, particularly a nonferrous metal, and excellent curability, without containing any chromium compound. The two-component-type primer comprises an epoxy resin, an MXDA (meta-xylenediamine) Mannich modified curing agent, a gypsum (excluding crystal gypsum), and a pigment (excluding gypsum), wherein the volume concentration of a gypsum and a pigment in a dry coating film formed with the primer is 40 to 50%.
1. A two-component primer, comprising:
a base agent component comprising an epoxy resin, and
a curing agent component comprising a meta-xylenediamine Mannich modified curing agent,
said two-component primer further comprising:
a gypsum, excluding crystal gypsum, and
a pigment, excluding gypsum,
wherein a volume concentration of the gypsum and the pigment in a dry coating film formed with the two-component primer is from 43 to 50%.
2. The two-component primer according to claim 1 , wherein said base agent component further comprises at least a part of said gypsum and at least a part of said pigment.
3. A layered antifouling coating film, comprising:
a primer coating film obtained from a two-component primer and
an antifouling coating film formed on a surface of the primer coating film,
wherein the two-component primer comprises
a base agent component comprising an epoxy resin, and
a curing agent component comprising a meta-xylenediamine Mannich modified curing agent,
said two-component primer further comprising:
a gypsum, excluding crystal gypsum, and
a pigment, excluding gypsum,
wherein a volume concentration of the gypsum and the pigment in the primer coating film is from 43 to 50%, and
wherein the antifouling coating film comprises a coating film obtained from a silicone resin-comprising composition.
4. The layered antifouling coating film according to claim 3 , wherein the epoxy resin comprises a bisphenol epoxy resin.
5. The layered antifouling coating film according to claim 4 , wherein the epoxy resin further comprises a novolac epoxy resin.
6. The layered antifouling coating film according to claim 3 , wherein a reaction ratio between the epoxy resin and the curing agent is from 0.5 to 1.0.
7. The layered antifouling coating film according to claim 3 , wherein a content of the gypsum in the primer is 5 to 300 parts by weight based on 100 parts by weight of the epoxy resin.
8. The layered antifouling coating film according to claim 3 , wherein the primer further comprises a curing accelerator.
9. The layered antifouling coating film according to claim 3 , wherein the primer further comprises a petroleum resin.
10. A ship propeller, comprising thereon the layered antifouling coating film according to claim 3 , wherein said ship propeller is a nonferrous metal ship propeller.
11. A method for preventing a base material from being fouled, the method comprising:
covering a surface of the base material with the layered antifouling coating film according to claim 3 in order of the base material, the primer coating film, and the antifouling coating film.
12. The method according to claim 11 , wherein the base material is a nonferrous ship propeller.
13. The layered antifouling coating film according to claim 3 , wherein the volume concentration of the gypsum and the pigment in the primer coating film is from 45 to 50%.
14. The layered antifouling coating film according to claim 13 , wherein the gypsum is hemihydrate gypsum.
15. The layered antifouling coating film according to claim 14 , wherein the hemihydrate gypsum is α type hemihydrate gypsum.
16. The layered antifouling coating film according to claim 13 , wherein the gypsum is anhydrous gypsum.
17. The layered antifouling coating film according to claim 3 , wherein the primer comprises (i) a bisphenol A epoxy resin or a bisphenol F epoxy resin and (ii) a novolac type epoxy resin, wherein a rate thereof (i):(ii) is, by mass ratio, 300:100 to 100:300.
18. The layered antifouling coating film according to claim 3 , wherein the meta-xylenediamine Mannich modified curing agent comprises a curing agent that is solid at 25° C. and a curing agent that is liquid at 25° C.
19. The layered antifouling coating film according to claim 3 , wherein the silicone resin-containing composition is a composition comprising an organopolysiloxane having at least condensation-reactive functional groups.
20. The layered antifouling coating film according to claim 3 , wherein said base agent component further comprises at least a part of said gypsum and at least a part of said pigment.