JPH02227476A - Surface-protection coating material for vibration-damping material to be attached to ship hull - Google Patents

Abstract

PURPOSE:To obtain the subject coating material giving a crack-free coating film having excellent flexibility and toughness and useful for the coating of a lamination-type vibration-damping material attached to a fuel tank section of a ship by using an epoxy resin, a flaky extender pigment and a polyamide resin as essential components. CONSTITUTION:The objective coating material contains, as essential components, (A) an epoxy resin (preferably a bisphenol A epoxy resin having an epoxy equivalent of 180-500), (B) a flaky extender pigment (preferably mica in an amount of 30-200 pts. per 100 pts. of the resin A) and (C) a polyamide (preferably a polyamide having high molecular weight and produced by the condensation of an organic acid and m-xylenediamine). The equivalent ratio of the epoxy resin to the polyamide resin is preferably 1/(0.2-1.2).

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a surface protective coating for a tension-type vibration damping material installed on the inside of a ship's outer plating, particularly in a fuel tank compartment of a ship.

[Conventional technology]

A pasted type vibration damping material is, for example, a tile-shaped material made of epoxy resin as the main ingredient, polyamide resin bound with a hardening agent, silica sand, etc. as a filler, and a flame retardant such as antimony oxide. It is attached with adhesive.

For example, the fuel tank section is the place where vibration damping material is installed on a ship, but conventionally the tank is painted with epoxy resin paint for protecting the steel plate, which is similar to the surrounding paint.
, S is emitted for the purpose of coating on vibration damping materials, and is not a good product. It has drawbacks in flexibility and toughness, and when coated on vibration damping materials, it is likely to cause film defects such as cracks. 6th next.

[Problem to be solved by the invention]

Tension-type vibration damping materials are installed on the inner surface of the outer skin of a ship as a damping material for ships, but if the outer skin panel of the hull is displaced due to wave impact, etc., it may be necessary to attach it to the panel surface. Displacement may occur in the following lateral vibration material as well.

The surface of the damping material is coated with oil-resistant, water-resistant, or surface-preservation paint depending on the installation location for aesthetic purposes. Conventional paints cannot follow the displacement of the outer panels and the resulting displacement of the damping material. As a result, there were problems such as cracking in the damping material and a tendency for the cracks to propagate due to displacement of the damping material.

For this reason, there was a need to develop a coating that has both flexibility and strength that can follow the displacement of the vibration damping material, and is less prone to cracking.

[Means to solve the problem]

The present invention is a two-sided damping material for ship hull-attached vibration damping materials that contains epoxy resin, scale-like extender pigment, and polyamide resin as essential components! I! It is in the i department.

That is, the present invention uses an epoxy resin, a scale-like extender pigment, and a polyamide resin as a hardening agent as an adhesive for a vibration damping material attached to a ship's hull, particularly in a fuel tank compartment, thereby replacing the conventional epoxy for tanks. Compared to plastic molds, it improves the flexibility and toughness of the coating film, follows changes in vibration damping materials, and solves problems such as cracking.

The materials of the coating material of the present invention will be explained below.

A feature of the present invention is the use of mica, which is a scale-like extender pigment. - Inside the shell, talc, barium acid, etc., which are widely used as extender pigments, are used.
Since the flexibility and water resistance of these coating films are inferior to that of mica, it is necessary to use mica in combination. The blending ratio of mica is 30 to 300 parts per 100 parts of epoxy resin.
If the blending ratio of mica is less than 30 parts to the epoxy resin (solid content), the water resistance will decrease, and if it is more than 300 parts, the elongation rate of the coating film will decrease. and cracks are more likely to occur.

In addition, the equivalent ratio of the epoxy resin to the polyamide resin described below is suitably t/CL 2 to 1/1.2, particularly preferably l/(L4 to 1/1.0). When the ratio is less than 1/(L2), the water resistance of the coating film decreases, and when it is 1/12 or more, the water resistance also decreases.

The polyamide resin used in the present invention as a curing agent is not the conventionally used ethylenediamine, diethylenetriamine, triethylenetetraamine, or tetraethylenepentamine, but is modified into a high molecular weight polyamide using metaxylene diamine as a base. , the elongation rate and water resistance of the coating film are excellent. The type of dimer acid and the proportion of trimer acid and monomer acid are arbitrary.

Representative examples of the polyamide resin include 1 ADEKA Hardener IH-402, ADEKA KH-405, and ADEKA RH-306' (trade names), all manufactured by Asahi Denka Kogyo Co., Ltd.

The epoxy resin used in the present invention is a condensation polymer obtained by reacting epichlorohydrin and diphenylpropane in various proportions, and is called a bisphenol A type epoxy resin. The epoxy equivalent of the epoxy resin conveniently used in the present invention is 180 to 500.

Representative examples of the above-mentioned epoxy resins include “Ebiol E-021) and E-054 manufactured by Ohtake Chemical Co., Ltd.”
and E-001'' (trade name).

In addition to the above-mentioned extender pigments, colored pigments such as titanium white, carbon black, and Bengara can be used as pigments for the paint of the present invention.

The solvent used is mainly aromatic hydrocarbon solvents such as toluene and xylene, and methyl ethyl chloride (generally ME
K), methyl isobutyl ketone (generally referred to as MIBK), methyl isobutyl ketone (commonly referred to as MIBK)
), ketone solvents such as Inglobil alcohol,
At least two or more solvents selected from alcohol solvents such as butyl alcohol, glycol solvents such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether (generally referred to as cellosolve), etc. can be used.

As the anti-sagging agent, amide type, hydrogenated castor oil type, organic bentonite type, etc. can be used.

〔Example〕

The compositions of Examples and Comparative Examples of the present invention are shown in Table 1, and the test results are shown in Table 2. In addition, all formulations in the examples are shown with heavy responsibility.

All the main ingredients in the examples were sufficiently dispersed using three rolls, mixed with a curing agent, and thoroughly stirred to prepare a test coating. The paint used in the comparative example was a commercially available epoxy resin paint for tanks.

The test paints of Examples 1 to 5 and Comparative Examples obtained as described above were air-sprayed twice on the coated surface side of a vibration damping material with a size of 1 dtx 50 x 150 cm to a dry film thickness of 200 cm.
It was painted so that it had a coating thickness of μ, and was dried for 7 days at a temperature of 20°C and a relative humidity of 75°C before being tested. The test piece for the tensile test was a single coating film.

The test method is as follows.

(1+ [! Film appearance; presence or absence of pinholes was observed.

(2) Adhesion; cross-section test (2m x 2m 25
) The adhesion with vibration damping material was tested.

(3) Bending test: At temperature conditions of 20°C and 10°C, the bending radius was IK6cs+ (elongation rate 5) and 9.551 (elongation rate 8
The presence or absence of cracks in the paint film was observed by bending the paint film.

(4) Tensile test: A tensile test was conducted using Shimabara Autograph Model D8C-M to examine the elongation rate of the coating film.

(5) 40°C salt water immersion test: A steel material was pasted on the surface of the painted damping material, the etch part was sealed with epoxy resin, and then immersed in 40°C SRS salt water to examine the coating film, appearance, and adhesion. .

+8140°C No. 2 light oil immersion test; After preparing test pieces in the same manner as the 40°C salt water immersion test, they were immersed in 40°C No. 2 light oil to examine the coating film, appearance, adhesion, and weight change.

(Note 1) Ebiol R-001 epoxy equivalent weight 475, Otake Chemical Co., Ltd. (Note 2) Typhusa) a-le 8T hydrogenated castor oil based, NL Chemical, manufactured by LTD% (Note 3) MIBK/xylene/isobutyl alcohol-
40/40/20 (weight ratio) (Note 4) ADEKA Hardener EH-106 solid content 7 (1, active hydrogen equivalent 16
5. Back of Asahi Denka Kogyo Co., Ltd. (Note 5) 7 Criteria for evaluating occurrence of cracks, cracks, etc. 0-... Good, Δ... Slightly poor, ×...
As shown in the table above, the test results show that the m-family of the present invention has excellent suitability as a damping material.

〔Effect of the invention〕

By using epoxy resin, scale-like extender pigment, and polyamide resin as essential components, the flexibility and toughness of the coating film was improved, and the problem of cracking was solved by changing the vibration damping material.

Claims (4)

[Claims] (1) A surface protective coating for hull-attached vibration damping materials that contains epoxy resin, scale-like extender pigment, and polyamide resin as essential components. (2) The surface protection food for a ship-mounted vibration damping material according to claim (1), wherein the scale-like extender pigment is mica and is used in an amount of 30 to 200 parts per 100 parts of the epoxy resin. (3) The surface protective coating for a hull-mounted vibration damping material according to claim (1) or (2), wherein the epoxy resin is a bisphenol A type epoxy resin and has an epoxy equivalent of 180 to 500. (4) The polyamide resin is a high molecular weight polyamide produced by condensation of an organic acid and meta-xylene diamine, and the equivalent ratio of the epoxy resin and the polyamide resin is 1/0.
．． 2 to 1/1.2. The surface protective coating for a hull-attached vibration damping material according to any one of claims (1) to (3).