COATING COMPOSITION

Abstract

A binder composition comprising 50 to 80% by weight of an acrylate ester of an epoxy-novolac resin, 20 to 49% by weight of mono-, di- or trifunctional acrylates, 0.1 to 2% by weight of a starter, 0 to 10% by weight of other auxiliaries,
wherein said binder composition essentially has no components that have a boiling point below 200° C. under normal pressure.

Claims

1. A binder composition comprising 50 to 80% by weight of an acrylate ester of an epoxy-novolac resin, 20 to 49% by weight of mono-, di- or trifunctional acrylates, 0.1 to 2% by weight of a starter, 0 to 10% by weight of other auxiliaries, wherein said binder composition essentially comprises no components that have a boiling point below 200° C. under normal pressure.

2. The binder composition according to claim 1, wherein said acrylate ester of an epoxy-novolac resin is a triacrylate ester.

3. The binder composition according to claim 1, wherein said mono-, di- or trifunctional acrylates are selected from the group consisting of 1,4-butanediol dimethacrylate, 1,6-hexanediol dimethacrylate, tripropylene glycol diacrylate, glycerol dimethacrylate, 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, polyethylene glycol 200 dimethacrylate, butyldiglycol methacrylate, dicylopentenyloxyethyl methacrylate, dihydroxycyclopentadienyl acrylate, tetrahydrofurfuryl methacrylate, ethyltriglycol methacrylate, trimethylolpropane trimethacrylate, and mixtures thereof.

4. The binder composition according to claim 1, wherein said starter is an azo-based or peroxide-based starter.

5. The binder composition according to claim 1, wherein said auxiliaries are selected from the group consisting of accelerators, decelerators, viscosity modifiers, adhesion promoters, and mixtures thereof.

6. The binder composition according to claim 1, wherein the content of monostyrene is ≤0.05% by weight.

7. A coating composition comprising from 30 to 70% by weight of the binder composition according to claim 1, and 70 to 30% by weight of fillers.

8. The coating composition according to claim 7, wherein said fillers are selected from the group consisting of glass fibers, glass fabric, carbon fibers, carbon fabric, and non-wovens, glass flakes, mica, graphite flakes, pigments, baryte, quartzes, silicas, cokes, carbon blacks, graphite, silicon carbide, alumina and mixtures thereof.

9. A molded part obtainable by curing the binder composition according to claim 1 or the coating composition according to claim 7.

10. The molded part according to claim 9, wherein said molded part is a component or a coating.

11. (canceled)

12. A process for coating a substrate comprising the steps of applying the binder composition according to claim 1, to obtain a coating layer, curing said coating layer.

13. The process according to claim 12, wherein said applying is effected by laminating, dipping, soaking, trowel-applying, jet-spraying or rolling methods.

14. A process for coating a substrate comprising the steps of applying the coating composition according to claim 7, to obtain a coating layer, curing said coating layer.

15. The process according to claim 14, wherein said applying is effected by laminating, dipping, soaking, trowel-applying, jet-spraying or rolling methods.

Description

Example 1

[0044] 66.27 kg of Ebecryl 9138 containing 80% by weight acrylate ester of an epoxy-novolac resin and 20% by weight 1,4-butanediol diacrylate was mixed with 22.22 kg of 1,4-BDDMA containing 90% by weight butanediol dimethacrylate and 11.11 kg of dicyclopentenyloxyethyl methacrylate (FA-512 M, Hitachi Chemicals).

[0045] On site, 20 g of accelerator, Accelerator NL-53 (Akzo), containing 60-70% by weight cobalt(II) 2-ethylhexanoate was added as auxiliaries to 10 kg of the above mentioned mixture, and stirred. This was followed by the addition of 200 g of the peroxide-based starter Peroxan CU-80-L (Pergan) containing 80-85% by weight cumene hydroperoxide.

[0046] A composition was formed that could be applied to a precleaned substrate. The layer thickness was about 0.8 mm. The product was processable for about 30 min., and the surface was tack-free after 24 hours. The coating reached its full loading capacity after 5 days. It was resistant against acids and alkalis.

Example 2

[0047] The procedure was the same as in Example 1, except that 16 kg of quartz filler Millisil W4 (Quarzwerke) was added with stirring as a filler after the addition of the starter, and well mixed with renewed homogenization. A composition was formed that could be applied to a precleaned substrate.

[0048] The layer thickness was about 2 mm. The product was processable for about 30 min., and the surface was tack-free after 24 hours.

[0049] The product showed reduced shrinkage stress as compared to Example 1.

Example 3

[0050] The procedure was the same as in Example 2, except that 2 random fiber mats having a base weight of 300 g/m.sup.2 each, instead of the quartz filler, was embedded into the resin matrix including the starter. The glass content of the total composition was 30%. After curing, a coating was obtained that has a higher mechanical stability.