JP2007314633A - Normal temperature curing type coating, method for applying the same coating and coated article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating combining undercoating with intermediate coat and topcoat and giving an excellent coated film performance by single coating. <P>SOLUTION: A metal material 1 to be coated is pre-treated in order to obtain surface state suitable for coating and then the pre-treated metal material is once coated with a normal temperature curing type coating containing 60-70 wt.% alkyd resin varnish, 1.0-2.0 wt.% rust preventing pigment and 19.5 wt.% topcoat coloring pigment to provide a coated film 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a room temperature curable coating material that forms an excellent coating film, a coating method of the coating material, and a coated product.

Conventionally, after pretreatment of metal materials constituting traffic equipment, industrial equipment, etc., synthetic resin-based undercoat paint is applied, dried in a drying furnace heated to hundreds of degrees Celsius, and surface irregularities are then sandpapered. The same synthetic resin-based top coating was applied. Further, if necessary, a similar synthetic resin-based intermediate coating was applied, and after drying in a drying furnace, a top coating was applied. (For example, refer to Patent Document 1).
JP 2003-245598 A (pages 2 and 3, FIG. 1)

The above-described conventional synthetic resin coating method has the following problems.
After the pretreatment of the metal material, each of the undercoat paint, the intermediate coat paint, and the top coat paint is applied in each step. However, after the undercoat paint and the intermediate coat paint are applied, drying is necessary. Drying includes standing at room temperature and heating in a drying furnace.

  However, if the drying of the coating film in each painting process does not reach the predetermined curing level, the air is blocked by the formation of the coating film in the next process, the coating film in the previous process becomes uncured, and the adhesiveness decreases, etc. There was a possibility of quality degradation. For this reason, the lead time in each process was long.

  In addition, in sand-paper polishing after drying the undercoat or intermediate coating, it is possible to perform good polishing with simple shapes such as flat portions, but sufficient polishing is required for complicated shapes and narrow portions. It was difficult to do. Insufficient polishing makes it difficult to form a coating film in the next step.

  For these reasons, there has been a demand for a paint that does not require drying by heating, exhibits excellent coating film performance in a single coating, and can shorten the coating operation.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a room temperature curable coating material that exhibits excellent coating film performance in a single coating, a coating method thereof, and a coated product.

  In order to achieve the above object, the room temperature curable paint of the present invention comprises an alkyd resin varnish of 60 to 70% by weight, a rust preventive pigment of 1.0 to 2.0% by weight, and a top coat color pigment of 19.5% by weight. It is characterized by containing.

  According to the present invention, coating is performed with a room temperature curable coating material having all the functions of an undercoat paint, an intermediate coat paint, and a top coat paint, so that it is excellent not only in initial properties but also over a long period of time by one application. Coating performance can be obtained, and the painting operation can be shortened.

  Embodiments of the present invention will be described below with reference to the drawings.

  A room temperature curable coating material according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a cross-sectional view showing a coating system for a metal material according to an embodiment of the present invention.

  As shown in FIG. 1, the surface of a metal material 1 such as pickled steel plate or cold-rolled steel plate (SPCC) that constitutes traffic equipment or industrial equipment is coated with a room temperature curable paint formed by a single coating. A membrane 2 is provided.

  Hereinafter, this coating method will be described.

  First, the surface of the metal material 1 is pretreated to obtain a surface state suitable for painting. The pretreatment includes chemical treatment for providing a zinc phosphate coating after degreasing, and mechanical treatment such as sand blast treatment for spraying sand, and any treatment may be used.

Next, the room temperature curable coating material shown in Table 1 is spray-coated, for example, to form a coating film 2 having a thickness of 40 to 100 μm and cured at room temperature.

  Here, the alkyd resin varnish obtains the adhesive force of the coating film 2, and can obtain a strong adhesive force within the range shown in parentheses. If it is out of this range, good results cannot be obtained in each test described later. Moreover, the rust preventive pigment obtains a rust preventive effect, and an excellent rust preventive effect can be obtained within the range shown in parentheses. Outside this range, if too much anticorrosive pigment is added, the color and glossiness become unstable, and if too small, an excellent antirust effect cannot be obtained. That is, according to the blending conditions shown in Table 1, a strong adhesive force and an excellent rust prevention effect can be obtained.

  The rust preventive pigment is a mixture of aluminum phosphate and zinc phosphate at a ratio of 1: 1, but a ratio of aluminum phosphate: zinc phosphate = 0.4 to 0.6: 0.6 to 0: 4. Even if it is changed with, an excellent antirust effect can be obtained. Moreover, even if at least one of aluminum phosphate and zinc phosphate is used, the antirust effect can be obtained.

  The following tests were performed on the coating film 2 formed to a thickness of 40 to 100 μm with the room temperature curable coating material of Table 1.

1. Initial physical property test (after painting, after 1 week at room temperature)
1-1 Hardness: JIS K 5600 Pencil scratch test 1-2 Adhesive strength: ASTM 3359 (cross cut or cross cut + adhesive tape test)
2. Durability test 2-1 Salt spray test: JIS Z2371 Appearance judgment and secondary physical property test after 750 hours of implementation 2-2 Moisture resistance test: JIS K 5600 Moisture resistance test (50 ° C., 95% RH) After 300 hours Appearance determination and secondary physical property test 2-3 Sulfurous acid gas test: 20 ppm, 40 ° C., 90% RH, appearance determination after 500 hours and secondary physical property test 2-4 Chlorine gas test: 1 ppm, 40 ° C., 90% Appearance determination and secondary physical property test after RH, 500 hours 2-5 Weather resistance test: JIS K 5600 Accelerated weather resistance test (Sunshine carbon arc lamp type) Appearance determination after 300 hours, color difference ΔE relative to initial state, gloss Degree retention and secondary physical property test

These test results are shown in Table 2.

  From Table 2, it can be seen that the coating film 2 made of the room temperature curable coating material has excellent coating film performance (durability). Here, in the color difference of the weather resistance test, the color difference ΔE is within 0.5, and in the glossiness, the variation is within 10 in the measurement of the 60-degree specular glossiness, which is strictly controlled. Become suitable. For example, it is suitable for heavy electrical equipment such as a power distribution facility with a high demand for color appearance. Moreover, since it has the outstanding salt water spray characteristic, it becomes suitable, for example with respect to the traffic equipment which drive | works a coast area.

  Furthermore, since this room temperature curable coating material has all the functions of an undercoat paint, an intermediate coat paint, and a top coat paint, it can be applied once and the painting operation can be shortened. In addition, as a single function of a general alkyd resin coating system, it can also be used for a painted product in an existing coating process.

  According to the room temperature curable paint of the above example, since it has all the functions of the undercoat paint, the intermediate coat paint, and the top coat paint, an excellent coating film 2 can be obtained by one coating, and the initial physical properties. In addition, excellent coating performance can be obtained over a long period of time, and the painting operation can be shortened.

  In addition, this invention is not limited to the said Example, In the range which does not deviate from the summary of invention, it can implement in various deformation | transformation. In the above embodiment, the coating on traffic equipment and industrial equipment has been described. However, a room temperature curable coating made of alkyd resin can also be used for general structures.

Sectional drawing which shows the coating system to the metal material which concerns on the Example of this invention.

Explanation of symbols

1 Metal material 2 Paint film

Claims (5)

Alkyd resin varnish 60-70 wt%,
Anti-corrosive pigment 1.0-2.0 wt%,
A room-temperature curable paint containing 19.5% by weight of a top coat color pigment.   The room temperature curable paint according to claim 1, wherein the rust preventive pigment contains at least one of aluminum phosphate and zinc phosphate.   2. The room temperature curable paint according to claim 1, wherein the rust preventive pigment has a ratio of aluminum phosphate to zinc phosphate of 1: 1.   A room-temperature-curable coating material according to any one of claims 1 to 3, wherein the room-temperature-curable coating material according to any one of claims 1 to 3 is applied to a metal material in any of the steps of undercoating, intermediate coating, and overcoating. How to paint.   A room temperature curable coating material, wherein the room temperature curable coating material according to any one of claims 1 to 3 is coated on a metal material.

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