JPS5834864A - Aluminum pigment-containing epoxy resin paint composition - Google Patents

Abstract

PURPOSE:To provide a paint compsn. which has excellent weather resistance and rust-inhibiting properties and in which leafing properties of aluminum pigment is improved, by incorporating scaly mica in an leafing eluminum pigment- contg. exposy resin. CONSTITUTION:Scaly mica is blended with a leafing aluminum pigment-contg. epoxy resin paint. A bisphenol F type epoxy resin is particularly suitable as the epoxy resin, since its viscosity is low, the amount of the solvent in the paint can be reduced, the resin makes it possible to produce a paint having a high nonvolatile content, a thick-wall coating can be conducted, and further leafing properties of aluminum pigment can be improved. Scaly mica is used in an amount of pref. 1-40wt% based on the amount of paint. When the amount is less than 1wt%, leafing properties of aluminum pigment can not be improved. When the amount exceeds 40wt%, water resistance and adhesion becomes poor.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an epoxy resin coating composition containing an aluminum pigment with improved adhesive properties and excellent weather resistance and rust prevention properties.

General number ζ! -Finder type aluminum H%t'4
tZ poxy resin paints have been used in a wide variety of applications, including steel towers, culverts, tanks, and vehicles. However, with conventional leafing-type aluminum pigment-containing epoxy resin paints, it is not always possible to obtain coatings with satisfactory 1-fing properties, resulting in poor coating appearance and poor weather resistance. there were.

In view of the above-mentioned current situation, it is an object of the present invention to provide a resin coating composition containing aluminum pigments having excellent leafing properties and the like.

Such an object is achieved by an aluminum pigment-containing epoxy resin coating composition characterized in that it contains flaky mica in a leafing-type aluminum pigment-containing epoxy resin.

The coating film obtained using the coating composition of the present invention has good leafing properties, and an overlapping layer of aluminum flakes is formed on the coating surface, and therefore, the coating film has a good appearance, and has excellent weather resistance and shrink-proofing properties. A membrane is obtained.

Therefore, the aluminum pigment-containing epoxy resin of the present invention mm1
Since the coating composition has a function not only as an undercoat but also as a topcoat, it can serve as both an undercoat and a topcoat in one step, thereby shortening the coating process.

The aluminum pigment-containing epoxy resin I11 coating composition of the present invention consists of an epoxy resin, a curing agent, a leafing-type aluminum pigment, a scaly mica, and a solvent as main components, and optionally a rust-preventing pigment and a substance. It contains pigments and various additives.

As the Nyxy resin, ordinary epoxy resins for paints can be used. For example, bisphenol A type epoxy resin.

Bisphenol Flu epoxy resin and the like can be typically used.

In particular, bisphenol F-type epoxy resin 1714-1 has a low viscosity, which means that the amount of solvent in the paint is small.This makes it possible to use paint with a high non-volatile content, thick film coating, and improves the leafing properties of aluminum pigments, making it ideal. Commercially available bisphenol Fll engineered poxy resins include Epiclon+ 830 (manufactured by Dainippon Ink and Chemicals) and Epomic R-140 (manufactured by Mitsui Petrochemical Industries, Ltd.).

As the curing agent, a normal curing agent for epoxy resins can be used. For example, aliphatic polyamines such as diethylene triamine and triethylene tetraamine, aromatic polyamines such as metaphenylene diamine, and cyanodiphenylmethane can be typically used.

In particular, when an aromatic polyamine is used, it is optimal because a coating film with good adhesion can be obtained even on metal substrates that have been treated to a low degree.

Commercially available products include Zummide M (a three-phase leafing type aluminum pigment that is commonly used in C type paints. In particular, paste-like O pigments whose surface has been treated with stearic acid, etc.) can be used. Gayo (
For example, Altop (manufactured by Tokai Kinzoku Co., Ltd.), Alpaste Sap (manufactured by Showa Aluminum Powder Co., Ltd.), Alpaste (manufactured by Showa Aluminum Powder Co., Ltd.),
manufactured by Toyo Aluminum Co., Ltd.), Eterna Prite (Sil I (manufactured by Toyo Aluminum Co., Ltd.),
Commercial products such as 5tapa (manufactured by Asahi Kasei Industries, Ltd.) and 5tapa (manufactured by Asahi Kasei Industries, Ltd.) can be used.

Suitable flaky mica has a diameter of about 1 to 20 μm.

Examples of solvents include hydrocarbon solvents such as toluene and xylene, ester solvents such as ethyl acetate and petinoge acetate, ether solvents such as cellosolve, and ketone solvents such as methyl ethyl ketone, nclohexanone, isophorone, and diacetone 7. However, a typical fl can also be used as (D).

Particularly, since the ketone solvent contributes to improving the 1) flying properties of the aluminum pigment, it is preferable to include the ketone solvent in a part of the solvent.

Each of these components is usually an epoxy tree Jli100, a leafing type aluminum pigment 5 to 1
00 to Kanbe, 5- 200 parts by weight or less of a solvent, 200 parts by weight or less of an anticorrosion pigment and an extender pigment are used, and the curing agent is 0.5 to 1.0 per 1.0 of the epoxy equivalent for epoxy*m. Equivalence degree 6
Used in indigo like ζ.

Further, it is appropriate to use scaly mica in the paint in an amount of 1 to 40% by weight.

If the amount of flaky mica used is less than the above aII, the leafing properties of the aluminum pigment cannot be improved, and if it is in excess, water resistance, adhesion, etc. will deteriorate, which is not appropriate.

In addition, some of the flake-like mica was added to the grain size of 1 to 1.
The leafing property of the aluminum pigment is improved even if it is replaced with α-crystalline atadenium oxide having a diameter of about 10 μm.

The coating composition of the present invention is used in the form of a three-component type consisting of a main component mainly composed of epoxy resin, a curing agent component and an aluminum paste component, and a Z-wave type in which the aluminum paste component is mixed into the main component in advance. be done.

# When using a ketone solvent as a solvent, it will react with the aluminum pigment. It should be mixed evenly with the a-forming agent component.

6-As mentioned above, the paint film obtained by the aluminum pigment-containing epoxy resin coating composition of the present invention has good adhesion properties, so the paint film appearance is good, and it has excellent weather resistance and rust prevention properties, especially as an epoxy resin. , bisphenol F type epoxy resin, which uses aromatic polyamine as a curing agent, can be coated on a wide range of metal-based treated charcoal objects, and does not require a top coat, and can be used as both a base coat and a top coat in one cycle. This makes it possible to shorten the painting process.

The present invention will be explained in detail below with reference to Examples. In the examples, "parts" and "%" are expressed on a weight basis.

Example 1 Bisphenol F type epoxy resin (Evicron 830:
Dainippon Ink & Chemicals Co., Ltd.) 30 parts, stearic acid coating aluminum paste (aluminum paste 53
-119: Toyo Aluminum Co., Ltd.) 15 parts, xylene 3
1 part and 2 parts of ethyl cellosolve were stirred and mixed to prepare a main ingredient.

Separately, 20 parts of scaly mica (major diameter 5 to 20μ), 15 parts of aromatic polyamine (cyanodiphenylmethane derivative) (active hydrogen equivalent: 120), 10 parts of xylene, and 5 parts of methyl isobutyl ketone were stirred and mixed, and a curing agent was prepared. as an ingredient.

A paint prepared by heating the main component and curing agent component in a ratio of (1:1) was applied with a brush to a dry film thickness of 100 nm on a steel plate (rust removal treatment level 5iS-8T2) and air-dried for one week. I let it happen.

Example 2 A paint was prepared and coated in the same manner as in Example 1, except that a metaphenylene diamine derivative (active hydrogen equivalent: 120) was used as the aromatic polyamine.

Example 3 Paint R was prepared and painted in the same manner as in Example 1, except that a xylene diamine derivative (active hydrogen equivalent: 100) was used as the aromatic polyamine.

Example 4 Paint 11431L was applied in the same manner as in Example 1, except that 10 parts of the 20 parts of phosphorescent mica in Example 1 was replaced with α-crystalline aluminum oxide having a particle size of 3 to 4 tones.

Example 5 Bisphenol A type epoxy resin (
A paint was prepared and painted in the same manner as in Example 1, except that Epicor 828 (manufactured by Niji Koru Kagaku Co., Ltd.) was used.

Comparative Example 1 A @ grade paint was applied in the same manner as in Example 5, except that talc was used instead of flaky mica powder.

Leafing property I (visual judgment), yellowing (visual judgment after 3 days of exposure to a), and water resistance (coating after being immersed in tap water for 1 month) of the coating films obtained in Examples 1 to 5 and Comparative Example 1 As a result of the film condition test, the coating films of Examples 1 to 5 had good leafing properties and no yellowing was observed.

In the water resistance test, no abnormalities were observed in the coating films of Examples 1 to 4, but some blisters were observed in Example 5.

On the other hand, the coating film of Comparative Example 1 had poor leafing properties and yellowed. In addition, some blisters were observed in the water resistance test.

Applicant Nidai Nippon Toyo Co., Ltd. 9-

Claims (3)

[Claims] (1) A leafing-type aluminum pigment-containing epoxy resin coating composition, which is characterized by containing flaky mica. (2) The aluminum pigment-containing epoxy resin coating composition according to item (1) of the patent claim, wherein the nixy resin is a bisphenol F-type epoxy resin and the curing agent is an aromatic polyazene.゛ (3) The aluminum pigment-containing epoxy resin coating composition according to claim 11 or (2), which contains 1 to 40% by weight of flaky mica.