JPS5998168A - Coating composition - Google Patents

Abstract

PURPOSE:To provide a coating composition for the coating of pylons, bridges, etc., applicable by single coating operation, and having improved leafing property, by adding a specific phosphorous acid trithioalcohol compound, etc. to an epoxy resin coating composition containing aluminum pigment. CONSTITUTION:The objective composition is prepared by adding (A) a curing agent component to (B) a main component obtained by mixing (i) 100pts.wt. of an epoxy resin (e.g. bisphenol F-type epoxy resin) with (ii) 3-100pts.wt. of the phosphorous acid trithioalcohol compound of formula P-(S-CnH2n+1)3, P-(S- CnH2n-1)3, P-(S-CnH2n-3)3 or P-(S-CnH2n-5)3 (n is 8-26) and (iii) 5-100pts.wt. of leafing-type aluminum pigment. The amount of the component (B) is 0.5-1.0 equivalent based on the epoxy equivalent of the component (B). EFFECT:Since the composition can be formulated in two-pack type, it can be applied easily, and gives a coating film having excellent appearanace, weather resistance and rustproofing property.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention improves the leafing properties of aluminum pigments,
The present invention also relates to a coating composition that does not particularly require an undercoat or a topcoat and can be finished in -1 coats.

In general, leafing type epoxy resin paints containing aluminum pigments have been used in a wide variety of applications, including steel towers, bridges, tanks, and vehicles. However, with conventional leafing-type epoxy resin paints containing aluminum pigments, it is not always possible to obtain a coating film with satisfactory leafing properties, and therefore a coating film with an aluminum feel is often not obtained, and the weather resistance is also poor. Met. Furthermore, since it is an epoxy resin paint, special care must be taken in treating the metal base, and a high level of charcoal is required for the base treatment, which is usually done by sandblasting acid or blasting.

Therefore, in consideration of rust prevention, dense growth, etc., a method has been used in which an epoxy resin primer is usually applied and a leafing type aluminum pigment-containing epoxy resin paint is applied thereon.

The present invention has buttons in the shape of a queen, improves the adhesion properties of aluminum pigments, can be applied to a wide range of gold and surface-treated objects, and can also be used as both an undercoat and a topcoat. It is an object of the present invention to provide an aluminum pigment-containing epoxy resin ax material compact of the type.

For this purpose, in a leafing type aluminum pigment-containing epoxy resin phase detection composition, a phosphorous acid trithioalcohol compound or its derivatives represented by the general formula %) (where n is an integer of g-2) is used. This is achieved by a coating composition characterized by containing.

Conventionally, three-component paints were used, consisting of a base component, a curing agent component, and an aluminum (-st) component. Aluminum paste components can be mixed in advance and stored, λ
Since a deep paint form is also possible, painting workability is improved. In addition, the obtained coating film has good spreading properties, a layer of overlapping aluminum flakes is formed on the coating surface, and therefore a coating film with a good coating Bφ external number and excellent weather resistance and rust prevention properties can be obtained. .

Furthermore, as described above, since the paint according to the present invention has the functions of both an undercoat and a topcoat, it can be used as both an undercoat and a topcoat in one application, thereby shortening the painting process.

The glue-on type aluminum pigment-containing coating composition of the present invention contains niboxy resin as the main component,
It consists of a hardening agent, a leafing type aluminum pigment, and a phosphite trithioalcohol compound or a derivative thereof, and is blended with a solvent, a rust preventive pigment, an extender pigment, and various additives as necessary.

As the epoxy resin, common epoxy resins for paints can be used. For example, Epicron #g'IO1#gOtsuθ, #10.3rθ (manufactured by Dainippon Ink & Chemicals), Epicorte #za, 2g, 0g311. #/θθ/ (Shell Chemical Co., Ltd. Di), Adeka Resin EP-4oθQ1EP
-11100, Epx4t9-10s EPX19-3
Ko, E p x lI9-33 (Asahi%f, manufactured by Kakogyo Co., Ltd.)
, DER#3/7, #33/, #AA/ (manufactured by Dow Chemical Co.) and other bisphenol A type epoxy resins; Adekal Resin EPX-119oθ (Kadenka Kogyo Co., Ltd. jJ3), Epicron #g, 30C Dainippon Ink Chemical Co., Ltd. Bisphenol F-type epoxy pattern resin such as Epomic R-7110 (manufactured by Mitsui Petrochemical Industries, Ltd.) manufactured by Shibasha; DER # Da 3/ (manufactured by Dow Chemical Company), Evicron N-660 (manufactured by Dainippon Ink & Chemicals) Rack-type epoxy resin is said to be a typical example. In particular, bisphenol F-type epoxy resin has a low viscosity, so the amount of solvent in the paint is reduced accordingly, making it possible to perform a high degree of non-interpolation separation, making it possible to paint in a transparent manner, and also improving the leafing properties of aluminum pigments, making it the best choice.・Appropriate.

As the curing agent, the curing agent for epoxy resins manufactured by Kaijo can be used. For example, aliphatic polyamines such as diethylenetriamine and triethylenetetramine, aromatic polyamines such as metaphenylenediamine and diaminodiphenylmethane, and polyamide resins can be used.

The hardening agent used for bone is based on the epoxy equivalent of epoxy pine resin.
0. The appropriate amount is such that the amount is 0 or 0.

As the leafing type aluminum pigment, those commonly used in this type of paint can be used, but paste-like pigments whose surface has been treated with stearin r# or the like are particularly preferred. For example, Pull Dog (manufactured by Tokai Kinzoku Co., Ltd.), Aluminum Base) 5ap (manufactured by Showa Aluminum Powder Co., Ltd.), Alpaste (manufactured by Toyo Aluminum Co., Ltd.), Eterna Bright (manufactured by Silver Line Co., Ltd.), 5tal)a (manufactured by Mukasei Kogyo Co., Ltd.), etc. Commercially available products can be used.

The appropriate amount of the leafing type aluminum pigment to be used is usually 3 to 700 parts by weight per 700 parts by weight of the epoxy resin.

In the present invention, as the phosphite trithioalcohol compound, a compound having the general formula % or a mixture thereof can be used.

In addition, in the above general formula, the n value is an integer of g-2 O. Compounds with an n value of less than 5 are unstable and easily decomposed, and conversely, compounds with an n value of more than 26 have poor compatibility with other components, and both are not preferred.

In addition, as a derivative of a phosphite trithioalcohol compound, seven of the r6't'F=-like saturated thioalcohols or mono-, di-, or tri-unsaturated thioalcohol groups in the general formula are substituted with phenol, thiophenol, or Derivatives thereof, such as those substituted with alkylphenols or alkylthiophenols, can be used. These phosphite trithioalcohol compounds and their derivatives are
It is a known compound per se and is easily available.

The amount of the phosphorous acid trithioalcohol compound or its conductor used is 3 to 7 parts by weight per 10θ weight part of the epoxy resin.
00 parts by weight, particularly preferably from s to 23 parts by weight. If the amount of the phosphite trithioalcohol compound or its derivative used is less than the above range, the above-mentioned effect cannot be expected, and on the other hand, if it is too large, the water resistance of the coating film will be extremely poor, which is not preferred.

In the present invention, by blending the above-mentioned phosphorous acid trithioalcohol compound or its derivative, the aluminum pigment can be made into a paint without losing its leafing properties even after long-term storage, and the aluminum pigment can be made into a paint without losing leafing properties, which is required for conventional Epokin resin paints. This eliminates the need for severe surface treatment, and results in a coating film with excellent adhesion and yellowing resistance.

Solvents that can be used appropriately in the present invention include toluene,
Hydrogenated solvents which are nonpolar solvents such as xylene, benzene, naphtha, etc. are suitable. In addition, when using a polar solvent such as a ketone solvent, it reacts with aluminum and sulfur/acid trithioalcohol compounds or their derivatives, so for example, these should be mixed with the main component in advance and stored for a long period of time. In some cases, polar solvents need to be mixed into the curing agent component.

The amount of solvent to be used is 700 parts by weight of the epoxy material/i-fat, and the weight of /θ to 7θ heavy area. Incidentally, when the phosphorous acid trithioalcohol compound or its derivative is used in a large amount within the above range, it is not necessarily necessary to add a solvent.

Furthermore, in the present invention, as described above, antirust pigments and extender pigments can be used as necessary. The amount of these anti-# pigments and extender pigments is
It is appropriate that the XOO shield is smaller than the XOO shield.

The present invention will be explained in detail below with reference to Examples. In addition, "part" and "%" in the examples are 71! Indicated by reference standards.

Example/ 23 parts of leafing type aluminum paste pigment (Aluminum Haste!, 3-//9 manufactured by CMl Yoh Aluminum Co., Ltd.), part of trithiotrilauryl/θ and part of xylene in a disper 4-, Mix the pre-kneaded mixture, 30 parts of bisphenol FfJ9 engineering I xy resin (Evicron #za 30 [manufactured by Dainippon Ink & Chemicals Co., Ltd.]), part S of xylene, and part S sagging agent, and mix with a disper. It was used as a main ingredient.

Separately, modified aromatics? Liamin (Sanmide M-/l10
0c Sanwa Kagaku Kogyo Co., Ltd.]) 27 parts, calcium carbonate 3!
;m, 23 parts of mica, 5 parts of xylene, 3 parts of methyl isobutyl ketone, 1 part of anti-sag agent and 1 part of suspending agent were kneaded in a disper to obtain 1 part of hardening agent.

A paint was prepared by mixing the base agent component and the curing agent component in a ratio of (/:/).

Example λ A paint was prepared in the same manner as in Example except that trithiotristearyl okiphosphate was used instead of trithiotrilauryl phosphite.

Example 3 20 parts of leafing type aluminum paste pigment,
After pre-mixing the IO part of trithiotrilauryl sulfate and the Kijirenda part in a disper, 60 parts of bisphenol A epoxy Itjk (Epicoat #gλg [manufactured by Shell Chemical Co., Ltd.]), 3 parts of xylene and 3 parts of anti-sag agent were added. were mixed and kneaded in a disper to form the main ingredient.

Separately, add 20 parts of polyamide amine (Tomide 2SS [Fuji Kasei Kogyo Co., Ltd. e]), 35 parts of calcium carbonate, 70 parts of mica, 73 parts of xylene, 1 part of methyl ethyl ketone, 1 part of sagging agent, and 1 part of suspending agent. They were combined in a disper to form a curing agent component.

A paint was prepared by mixing the base agent component and the curing agent component in a ratio of (/:/).

EXAMPLE A paint was prepared in the same manner as in Example except that trithiotricalyl phosphite was used in place of trithiotrilauryl phosphite.

Example Left: A paint was prepared in the same manner as in Example 1, except that trithiotrioleyl phosphite was used instead of trithiotrilauryl phosphite.

Example 6 A paint was prepared in the same manner as in Example except that trithiotrilylnitrous acid was used in place of trithiotrilauryl phosphorus.

Comparative Example/Saitaki Example/In the main component, xylene 70 is used as a solvent.
Using 77 parts of a mixture of xylene and isobutanol in place of 1 part of phosphorous. 2 trithiotrilauryl/0
@Except using 70 parts of petroleum resin instead of Is';(
Mineral materials were prepared in the same manner as in Example.

Comparative Example Example 3 was carried out in the same manner as in Example 3, except that 1≦ of trithiotrilauryl haha, a mixture of xylene and isobutanol, was used as the main component and 7 parts of xylene and isobutanol were used instead of 7 parts of xylene. A paint was prepared.

Ratio/Bite Example 3 The same procedure as in Example 1 was carried out, except that trithiotrilauryl phosphonate was replaced by trithiotrilauryl phosphate, and an elephant was given one coat of paint.

It was prepared in the same manner as in the Shark Fighting Example except that trithiotrimericyl phosphite was used instead of trithiotrilauryl.

Real++rlx 4 rows/~B, and Jt school rows/~G,
Leave the main component that has cooled down for a certain period of time, mix it with the facilitative component, and dry this coating I:1 with a brush and apply it on a fire cloth to a thickness of 100 μm on a plate. After 7 weeks of eating at a natural store, leafing was visually determined. The results are shown in the first trial.

Table 1 Judgment Criteria ◎ ←→ Rusty iron plate (
2. Apply the coating to a dry film thickness of 100μ with a brush, let it air dry for 1 week, cross-cut it, and pass the salt spray test (1000 hours) and outdoor exposure test (1 year). The results are shown in Table 2.

As is clear from Tables 1 and 2, the paint of the present invention had good firming properties after long-term storage, provided a coating film with a good metallic feel, and also had excellent rust prevention properties. On the other hand, the paints of Comparative Examples/--G which do not contain the phosphoric acid trithioalcohol compound used in the present invention have a poor metallic feel after long-term storage, and are also poor in anti-corrosion properties. Ta.

Claims (1)

[Scope of Claims] In a leafing type aluminum pigment-containing epoxy resin coating composition, an auxiliary phosphoric acid trithioalcohol compound represented by the general formula %) (where n is an integer from g to 2) or a coating composition containing a derivative thereof. (2) Add 3 parts of the above phosphorous acid trithioalcohol compound or its derivative to 100 parts by weight of the epoxy resin.
The coating composition according to claim 1, characterized in that the coating composition contains 10 θ parts by weight.