JPH0699649B2 - Anticorrosion paint composition - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an anticorrosion coating composition, and in particular to extending the anticorrosion period of a steel structure, enabling anticorrosion under harsh conditions, and cost required for maintenance. The present invention relates to an anticorrosion coating composition capable of saving

(Prior Art) Conventionally, two-component anticorrosive paints such as epoxy type, urethane type, coal tar epoxy type, and coal tar urethane type have been widely spread as long-term anticorrosive paints. These two-component type anticorrosive paints are superior in anticorrosion property to other one-component type anticorrosive paints, but because they are two-component type, they require extra labor for opening, mixing, stirring, etc. There are also restrictions on the usage time and the recoating interval. In addition, in recent years, it is not possible to meet the demand for extension of the anticorrosion period and the demand for anticorrosion under severe conditions such as high temperature, high humidity, sewage, human waste, and corrosive gas atmosphere. Furthermore, bituminous paints such as coal tar epoxy and coal tar urethane are more popular because they are cheaper and have better anticorrosion properties than epoxy-based urethane-based paints that do not contain bituminous substances. Therefore, its use has been severely restricted in fields requiring a colored topcoat finish.

(Problems to be Solved by the Invention) The one-component anticorrosive paint containing butyl reclaimed rubber and / or butyl rubber as a main color-developing agent is added to the invention made to overcome the above-mentioned drawbacks of the existing two-component anticorrosive paint. (JP 59-1050
63, hereinafter referred to as the original invention). However, the hardness of the butyl rubber anticorrosion coating does not increase, and therefore, a method of adding a tackifying resin or a bituminous material has been tried, but the tackiness of the coating film increases, and dust and the like easily adhere, On the contrary, the drying property was deteriorated and the hardness could not be increased. Furthermore, a filler was added to reduce the amount of the color-developing agent component, and an attempt was made to increase the hardness. However, although the drying property was improved, there was almost no effect on the increase in the hardness and the anticorrosion property was significantly lowered. . Therefore, an attempt was made to study various resins as the color-developing agent component without reducing the color-developing agent component, but compatibility with butyl rubber is poor for most resins, and phase separation and formation of gel-like substances do not occur. The corrosion resistance was deteriorated. Also, it has been found that these points can be improved by using a two-component system using an epoxy resin, but it is necessary to perform a two-liquid mixing operation, and since it cures over time, there is a change in viscosity after mixing and a pot life. There was a problem with sex. Therefore, in order to solve the technical problem of obtaining an anticorrosion coating capable of increasing the hardness and increasing the drying speed while being a one-component type, the present invention is a softness which is a drawback of the preceding original invention. As a result of earnestly studying the slow drying property from various angles, it is extremely effective to use a cashew oil-modified alkyd resin and / or cashew oil formalin condensate, which has not been used or studied as a heavy-duty anticorrosive paint, as a color-developing agent component. The present invention has been completed based on the knowledge that the anticorrosive property, which is the object of the original invention, is not impaired.

(Means for Solving Problems) The anticorrosion coating composition of the present invention comprises at least one selected from ibutyl reclaimed rubber and / or butyl rubber as a color-developing agent, rocathew oil-modified alkyd resin, and cashew oil formalin condensate. It is characterized in that they are used in combination with one another.

In the present invention, the proportion of butyl regenerated rubber and / or butyl rubber in the total color developing agent can be 10 to 60% by weight, and the total color developing agent of cashew oil modified alkyd resin and / or cashew oil formalin condensate can be used. The proportion of them can be 10 to 80% by weight. Alternatively, polystyrene can be used, the proportion being 0-60% by weight in the total color developer.

The butyl reclaimed rubber used in the present invention is a vulcanized butyl rubber that is physically and chemically treated and dissolved in an organic solvent, and has low gas permeability, water resistance, low water absorption, chemical resistance, and electrical resistance. It has excellent insulating properties and flexibility, and these properties are ideal as a color spreader for anticorrosion paints. The properties of these butyl regenerated rubbers are derived from the properties of vulcanized butyl rubber and are superior to unvulcanized butyl rubber (hereinafter simply referred to as butyl rubber).

Generally, vulcanized butyl rubber is reinforced with carbon etc.
Therefore, the butyl recycled rubber made from this material is colored black. Therefore, a butyl rubber that can be colored can be used when aesthetics are required, and a butyl recycled rubber and a butyl rubber can be used in combination when the hue has low lightness and saturation. Further, since it does not have the bleeding phenomenon unlike the bituminous material-containing paint, the appearance can be imparted by top-coating a colored topcoat paint such as a chlorinated rubber type or vinyl type.

Butyl recycled rubber and / or butyl rubber are
It is preferably used in the range of 10 to 60% by weight (hereinafter,% means% by weight unless otherwise specified). If it is less than 10%, the effect is small, and if it exceeds 60%, the spray paintability is poor,
The range of 25 to 50% is most preferable because it is difficult to obtain a dense coating film.

The condensate of cashew oil modified alkyd resin and / or cashew oil with formalin, paraform, etc. has an unsaturated double bond capable of oxidative polymerization, and is polymerized by oxygen in the atmosphere to become a polymer having a chain hardness. . The former is superior to the latter in curability by oxidative polymerization, but the curability of the latter can be improved by modification with a small amount of maleic acid, and the former and the latter can be mixed and used. By using these cashew resins together, it is possible to supplement the softness and slow drying property of butyl reclaimed rubber and / or butyl rubber, as well as excellent chemical resistance, water resistance, electrical insulation, and adhesion to steel plates. . These properties are superior to the cashew oil condensate, but the cashew oil-modified alkyd resin can sufficiently exert the effects of the present invention unless the environment is particularly harsh. Both can be used together. These cashew resins are in the range of 10 to 80% in the total color developing agent, and most preferably
It is suitable to use in the range of 20 to 70%. The polystyrene used in the present invention has high hardness and quick drying property,
It is a color-developing agent that complements the softness and slow-drying properties of butyl reclaimed rubber and / or butyl rubber, and is also excellent in water resistance, chemical resistance, and electrical insulation. It is suitable to use it in the range of 0 to 60% in the total color developing agent, but if it exceeds 60%, the adhesion to the steel sheet tends to be lowered, and it is preferably used at 50% or less.

As described above, by combining the excellent properties of the resin, the softness and slow drying property of the original invention are improved without impairing the corrosion resistance of the original invention (JP-A-59-105063), and the present invention is obtained. It has been completed.

As other components used in the present invention, red pigment as a coloring pigment, titanium white, yellow lead, aluminum powder, etc., extrinsic pigments such as talc, clay, calcium carbonate, barium sulfate, mica, etc., and zinc chromate as a rust preventive pigment, Red lead,
Condensed aluminum phosphate or the like can be appropriately selected and used as necessary.

As the solvent, mainly aromatic solvents such as toluene and xylene, aliphatic solvents such as mineral spirits, ME
Use a ketone solvent such as K, MIBK or anone, an ester solvent such as ethyl acetate or butyl acetate, a cellosolve solvent such as ethylene glycol alkyl ether or ethylene glycol alkyl ether acetate, or an alcohol solvent such as ethanol, IPA or butanol. be able to.

As an additive, an oxidative polymerization catalyst such as cobalt salt of naphthenic acid, lead salt or manganese salt, an anti-skinning agent such as methylethylketoxime, erosile, hydrogenated castor oil, an anti-sagging agent such as organic bentonite can be used. .

In addition to the above-mentioned composition, a field where appearance does not matter and a field which does not require a colored finish, for example, when coating on the inside of a ballast tank of a ship, coal tar, coal tar pitch, swelling carbon, bitumen such as asphalt. You may mix the quality.

The coating material according to the present invention is quick-drying and can be applied to a brush, a roller,
It can be painted by ordinary painting means such as spray painting,
There is no restriction even if the coating interval is long-term.

Another application of the present invention is coating of clothes for preventing deterioration of concrete.

(Effects of the Invention) The effects of the present invention are as follows.

(1) (a) butyl regenerated rubber and / or butyl rubber,
(B) By combining the excellent properties of at least one resin selected from polystyrene, cashew oil-modified alkyd resin, cashew oil formalin condensate, environmental barrier properties, water resistance and chemical resistance required for anticorrosion paints , Electrical insulation, durability, and adhesion are secured.
It is possible to extend the anticorrosion period and prevent corrosion under severe conditions.

(2) By using cashew resins, the softness of the original invention,
The slow-hardening defect has been improved and the control of the coating process during thick film coating has become easier.

(3) Because it is a one-component type, there are no restrictions on pot life, coating interval, etc., and the labor required for can opening, mixing, stirring, etc. is added, greatly improving the coating work efficiency in heavy anticorrosion coating. It was

(4) Since no bituminous substance is contained, a colored finish is possible.

Hereinafter, the present invention will be described in more detail with reference to Examples. The present invention is not limited by the following examples.

4. Examples Table-1 shows the compositions of Examples 1-5, and Table-2 shows the evaluation results of these Examples and Comparative Examples 1-2, respectively.

(Preparation of Example Paint) The compositions shown in Table 1 were shaken for 2 hours with a glass shaker using a paint shaker and uniformly dispersed to obtain Example paints.

(Adjustment of test plate) A 75 × 150 × 2.3 mm black leather plate was treated with a disk sander and adjusted to SIS St 3 for use.

(Evaluation method) The paints of Examples and Comparative Examples were applied by an air spray so as to have a dry film thickness of 150 µ, and dried in a room for 10 days to give test pieces, and the following items were evaluated.

(1) Drying property The drying property 24 hours after application was evaluated according to the JIS K-5400 standard.

(2) Salt water resistance It was immersed in a 3% saline solution at 40 ° C for 6 months, and the adhesion, blisters and rusting conditions were evaluated.

(3) Acid resistance It was immersed in a 3% saline solution adjusted to pH 3 with acetic acid for 3 months and evaluated for adhesion, blistering and rusting.

(4) Alkali resistance It was immersed in a 3% saline solution adjusted to pH 12 with ammonia for 3 months, and evaluated for adhesion, blistering and rusting.

(5) High temperature and high humidity resistance It was exposed to an atmosphere of 50 ° C. and a relative humidity of 98% for 3 months, and the adhesion and the blister generation state were evaluated.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-59-105063 (JP, A) JP-A-51-10836 (JP, A) JP-A-57-145122 (JP, A) JP-A-59- 219371 (JP, A) JP-A-49-101409 (JP, A)

Claims (3)

[Claims] 1. As a color-developing agent, (a) butyl recycled rubber and / or butyl rubber, and (b) at least one selected from cashew oil-modified alkyd resin and cashew oil formalin condensate are used in combination and blended. An anticorrosive coating composition comprising: 2. The anticorrosion coating composition according to claim 1, wherein the butyl regenerated rubber and / or butyl rubber accounts for 10 to 60% by weight in the total color developing agent. 3. A cashew oil-modified alkyd resin and / or
Alternatively, the proportion of the cashew oil formalin condensate in the total color developing agent is 10 to 80% by weight, and the anticorrosion coating composition according to claim 1.