JPS59184267A - Coating composition having excellent rustproof and corrosionproof performance - Google Patents

Abstract

PURPOSE:To provide a coating compsn. having excellent rustproof and corrosionproof performance, storage stability, etc. as well as excellent interlaminar adhesion, by blending blast furnace cement with a solvent type paint. CONSTITUTION:1-50wt% blast furnace cement is blended with a solvent type paint such as an alkyd resin paint or a vinyl chloride resin paint to obtain the desired coating compsn. If desired, a filler such as calcium carbonate, titanium oxide or carbon, a fine aggregate such as silica sand, etc. may be blended with the coating compsn. The coating compsn. can be prepd. by using a conventional dispersion mixer such as rollers or a sand mill. The coating compsn. is usually diluted with 5-10% solvent and then applied. However, the coating compsn. can be directly applied without using any diluent.

Description

[Detailed description of the invention] The present invention relates to a rust- and corrosion-preventing coating composition.

Conventional rust-preventing paint compositions include, for example, solvent-based paints containing lead-based pigments such as red lead, lead oxide, zinc oxide, and basic lead sulfate, as well as zinc chromate and basic lead oxide. Products containing chromium pigments as antirust pigments are known. However, such rust-preventing paint compositions contain harmful heavy metals such as lead and chromium, and therefore have the disadvantage of being poor in safety and quality, such as environmental pollution and pollution problems. A coating composition described in Japanese Patent Publication No. 56-43.267 was developed in order to improve the purple color of the lamp. The composition described in the publication is
Portland cement powder (JISR52) for solvent-based paints
10). The composition is excellent in safety because it does not contain heavy metals such as lead, and has rust prevention performance equivalent to or better than conventionally known rust prevention paint compositions.

However, at the same time as pursuing the rust prevention function, research on coating threads resulted in interlayer adhesion between the undercoat and topcoat. According to the results of the inventors' investigation of +:, when the coating composition described in the publication was subjected to a practical exposure test, it was found that interlayer blistering, peeling, etc. occurred, and interlayer adhesion was poor. did. In general, paints are combined with various paint systems in consideration of the durability and weather resistance of the paint film, including cosmetics, and it is customary to apply a top coat or intermediate coat and top coat on top of the base coat. 9. Adhesion between each layer such as intermediate coating and top coating is important.

In particular, when cement is added to a solvent-based paint, the gloss of the paint film decreases depending on the amount of cement added, so if such a coating composition is used for low-end coatings, it is necessary to add a top coat to add beauty and gloss. It is essential to implement the following. From this perspective, it is a practical problem that the coating composition described in the above publication has poor interlayer adhesion.

In view of the current situation, the present inventors have developed a coating composition that is highly safe, has rust and corrosion prevention performance equivalent to or better than conventional antirust paint compositions, and also has excellent interlayer adhesion properties. I have been doing as much research as possible.

As a result, blast furnace cement (JISRi) was added to solvent-based paints.
It has been found that the intended purpose of the present invention can be achieved when compounded with 5211). The present invention was completed based on this knowledge.

That is, the present invention relates to a coating composition with excellent rust and corrosion prevention performance, which is characterized by blending blast furnace cement into a solvent-based paint.

The composition of the present invention has anti-rust and anti-corrosion properties and also has excellent interlayer adhesion. For example, as is clear from the examples below, when the composition of the present invention is used, no blistering or peeling of the layer 1u occurs even in the long-term exposure test and the secondary adhesion test after immersion in water, and good adhesion performance is achieved. have. In addition, regarding the rust and corrosion prevention performance,
The coating composition of the present invention is equivalent to or better than the coating composition described in the publication, and in particular, the composition of the present invention provides a coating film with excellent resistance to salt water @ fog injection, moisture resistance, water column resistance, salt water resistance, sulfate resistance, etc. to form. Furthermore, the composition of the present invention does not contain harmful heavy metals such as lead and chromium, and is highly safe in terms of environmental health and pollution problems.In addition, the composition of the present invention does not affect storage stability. It is also possible to form a coating film with excellent durability, weather resistance, abrasion resistance, etc.

It is essential that blast furnace cement is blended into the composition of the present invention. There is no particular limit to the blending amount of blast furnace cement, and it can be selected as appropriate within a wide range.
Usually 1 to 50% by weight (hereinafter simply "%") in the composition of the present invention.
), preferably in an amount of about 10 to 30%. When the blended amount of blast furnace cement is extremely reduced by even 1%, coating film defects such as blistering tend to occur early in various tests such as moisture resistance, water resistance, and salt water resistance.

On the other hand, if the blended amount of blast furnace cement becomes extremely large, such as 50%, the PVC (pigment volume concentration) of the coating film will increase, and many pores will be created in the coating film, resulting in overactivity, which will actually prevent rust. This tends to cause two problems: corrosion prevention performance is deteriorated and workability is also extremely deteriorated due to the high viscosity of the composition.

In the present invention, a wide range of conventionally known solvent-based paints can be used, such as alkaline resin paints, chloride resin paints, vinyl resin paints, acrylic resin paints, epoxy resins, and modified epoxy resin paints. Examples include resin-based resin paints, horsetail resin paints, and the like. Among these, it is particularly preferable to use acrylic resin paints and chloride resin paints.

In the composition of the present invention, commonly used fillers can be appropriately blended. Examples of such fillers include charcoal-based calcium, pallite, sulfur and barium 1 tal 91 kaolin A mica 1 0 seal, extender pigments such as quartz, coloring pigments such as titanium oxide, Bengara, and carbon. . The amount of these fillers to be blended is not particularly limited and may be appropriately selected within a wide range, but it is usually advisable to blend them in an amount of about 3 to 30% in the composition of the present invention. Furthermore, other third components such as fine aggregate such as silica sand and analite, tar, etc. can be added to the composition of the present invention.

There are no particular restrictions when producing the composition of the present invention.
Conventionally known manufacturing methods can be employed.

For example, D-ru 1 sand mill 1 ball 3) Pebble mill
General dispersion machines such as attritors can be used.

The composition of the present invention can be put to practical use by diluting it with a solvent of about 5 to 10%, but it is better to apply the composition without diluting it to objects where the base layer cannot be thoroughly coated. It can exhibit excellent rust and corrosion prevention performance.

Examples and comparative examples are given below to further clarify the present invention. In the following examples, "parts" simply means "parts by weight."

Example 1 A rust- and corrosion-preventing coating composition of the present invention is prepared using the formulations shown in Table 1 below. For comparison, Table 1 ( 2) Bentone #34 powder (NL Chemical ■) (3) Nafti? Mixture of lead heptate and cobalt octylate Each of the coating compositions prepared according to the formulations of Example 11 Comparative Example 1 and Comparative Example 2 was coated on a degreased satin finish (dull>m board (70 pieces x 1501E).
IX 0.8B) to a film thickness of 50μ. After drying for 7 days at room temperature (20°C), these test specimens were tested for salt spray resistance test 1, moisture resistance test, water resistance test, salt water resistance test and sulfuric acid resistance with all considerations for use in hot springs and coastal areas. It was subjected to a salt test. Salt spray resistance: 35°C, 5%N
The test piece was left for 170 hours or 330 hours under an atmosphere with an aC of 196% or more to investigate the υ. Moisture resistance is 50
Place the test piece in an ambient atmosphere with a relative humidity of 96% or higher at 150°C.
It was investigated by leaving it for 330 hours or 1IA1.

Water resistance is determined by soaking the test piece in iodine-exchanged water (20°C).
It was investigated by immersion during OH or for 30 days. Salt water resistance was investigated by immersing the test pieces in 3% NaCl water (20°C) for 15 or 30 days. Sulfate resistance was also examined by immersing the test piece in 1% maternesium sulfate water (20°C) for 10 hours or for 30 days. Judgment was made by visual observation and in accordance with the following criteria.

◎・・・Extremely good ○...Good ■・・・Normal △・・・Bad X... Extremely in love The test results are shown in Table 2 below.

Table 2 Next, on the test piece prepared above, an al+de-based paint Shihawk #300 (Kanae Paint ■) was applied to a film thickness of 3 with a coating interval of 1 day.
After drying the overcoated heel at room temperature for a few days so that the heel was 0μ, the test piece was subjected to a practical exposure test over a long period of time.

The test results are shown in Table 3 below.

Table 3 Also, as above, a test piece coated with Sashihawk #300 was immersed in clean water for 15 hours, then pulled up at room temperature for 2 hours, and the secondary adhesion was tested for the coating film after this time and 8 hours. did. For secondary adhesion, 2 yyn interval 7c 25th j
Performance was determined from the number of openings remaining after the tape peeling test.

The test results are shown in Table 4 below.

Table 4 Example 2 Coating compositions of the present invention are prepared with the formulations listed in Table 5 below. For comparison, we also examined the case where white portland cement was mixed instead of blast furnace cement (Comparative Example 3) and the case where ordinary rust preventive paint was mixed with a lead-based rust preventive pigment (Comparative Example Now). It is shown in Table 5.

Table 5 (Note) (1) Super Chron 306 (40%) (Desumi Kokusaku) S Lube ■) (2) Arajudo 1208 (60%) (Hazuki Chemical Industry ■)
(3) Toyoparax l50 (Toyo H-Datsu Kogyo ■) (4)
Bentone #38 powder (NL Chemical Co., Ltd.) Example 2 above,
The coating compositions prepared according to the formulations of Comparative Examples 3 and 4 were subjected to various tests in the same manner as in Example I. ' The test results are shown in Table 6 below.

No. 6 Representative: Patent attorney Eiji Saegusa, ¥”jj,
"j"':;.

Procedural amendment (1) June 16, 1981 1, Indication of the case, 1982 Patent Application No. 5979, current issue 2, Title of the invention: Coating composition with excellent rust and corrosion prevention performance 3, Person making the amendment 4. Agent 5. Date of amendment order. 6. Number of inventions not increased by the amendment. Contents of the amendment. 1. Description page 4, line 10, “Special Publication Publication No. 116033, 116033, page 4, line 1.
Publication @] Toru [Special Publication No. 116033, Imaichi, Showa 5 (
(Special Publication No. 56-43267)” (0)

Claims (1)

[Scope of Claims] ■ A coating composition with excellent rust and corrosion prevention performance, which is characterized by blending blast furnace cemeshito into a solvent-based paint. (Illusion: 1 to 50% of blast furnace cement is added to the rust-preventive and anti-corrosion coating composition.)
% by weight of the composition according to claim 1. (2) Feature #1: The composition according to claim 1 or 2, wherein the solvent-based paint is an al+de resin paint or a chloride resin paint.