JPH0848555A - Coating material and its production - Google Patents

Abstract

PURPOSE:To produce a coating material capable of remarkably improving a corrosion resistance of a structure such as bridge and steel tower. CONSTITUTION:This coating material is obtained by mixing a compounding agent consisting essentially of a pumice sand obtained by grinding pumice and a solvent obtained by adding water to a water soluble resin. The compounding agent having a composition of 60-70wt.% pumice sand being a base material, 20-30wt.% cement, 7-9wt.% glass powder and 0.01-1wt.% each of a crack preventing agent, an org. water-retaining agent, an org. thickener and an antifoaminger agent is preferable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating material for coating a metal structure or the like, and a method for producing the coating material.

[0002]

2. Description of the Related Art Generally, structures such as bridges and steel towers are
It is painted to prevent corrosion of the material and improve its aesthetics.

Particularly, in the case of an object to be coated with a metal material, not only pretreatment such as degreasing and chemical conversion treatment for the material but also the surface to be coated is prepared with several kinds of base paints in order to finish with a beautiful and strong coating film. I am trying.

Underlying paints have been used for that purpose and include primers, putties, surfacers and the like.

The primer is a paint that takes into consideration the adhesion to the surface to be coated, that is, the material, rust resistance, and the adhesion to the top coating, and the putty is a paste-like coating for filling the concave portion of the surface to be coated, or a surfacer. Is a paint for preventing inhalation and see-through of the top-coat paint.

On the other hand, the top coat is made of resin, cellulose,
It comprises a film-forming main element such as oil and fat, a film-forming sub-element such as a dispersant / curing agent / plasticizer, and a pigment for coloring, and is mixed with a thinner or the like as a solvent.

[0007]

However, the above-mentioned conventional paints are significantly deteriorated due to the effects of acid, heat, light, moisture, shock, etc., and after several years, the coating film peels off and corrosion of the material progresses. It has the drawback that it does not work well and that it loses its aesthetic appeal.

For this reason, although repair coating is generally applied in a short cycle, repair coating not only involves many troublesome operations such as peeling of the old coating film and removal of corroded parts of the material, but also enormous repair work. Cost money.

[0009]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention mixes a compounding agent based on anti-fire sand obtained by crushing anti-fire stones with a solvent obtained by adding water to a water-soluble resin. By providing the coating material obtained by doing so, it is possible to significantly extend the repainting time, suppress the running cost, and improve the economical efficiency.

In particular, the compounding agent has a base anti-fire sand of 6
0 to 70% by weight, cement 20 to 30% by weight, glass powder 7 to 9% by weight, and crack preventive agent, organic water retention agent, organic thickener, and defoaming agent 0.01 to 1% by weight, respectively. % Composition. The water-soluble resin is a water-soluble acrylic resin, and the solvent is 25 to
35% by weight is mixed.

On the other hand, according to the present invention, 60-70% by weight of anti-sand containing crushed anti-fire stone, 20-30% by weight of cement,
7 to 9% by weight of glass powder, and 0.01 to 1 of a crack preventive agent, an organic water retention agent, an organic thickening agent, and an antifoaming agent, respectively.
It is characterized in that a compounding agent is formed by blending each by weight% and a solvent comprising water-soluble resin and water is added thereto in an amount of 25 to 35% by weight, and then the compounding agent and the solvent are mixed by stirring. A method for manufacturing a coating material is provided.

[0012]

According to the coating material of the present invention, the corrosion resistance of the coating material can be improved by adhering the coating material to the coating material such as a bridge or a steel tower.

Among the constituents of the coating material, the anti-fire sand as the base of the compounding agent functions to improve strength and acid resistance, while one solvent imparts lubricity and flexibility to the compounding agent. It works by firmly attaching the coating material to the material and curing it.

The cement contained in the compounding agent functions to harden the coating material and at the same time to impart strength, and the glass powder functions to improve strength and acid resistance.

On the other hand, the crack preventive agent prevents the occurrence of cracks particularly after the coating material is cured, and the organic water retention agent prevents the generation of cracks during the curing of the coating material.

Further, the organic thickener serves to impart appropriate viscosity to the coating material to improve smoothness at the time of application and at the same time suppress flow after application. Further, the defoaming agent functions to suppress foaming when the compounding agent and the solvent are mixed to obtain a smooth finished surface.

[0017]

EXAMPLES Examples of the present invention will be described below. FIG. 1 shows a state in which a material is coated with the coating material of the present invention. In the figure, 10 is a material, 20 is a primer, 30 is the coating material of the present invention, and 40 is a coating film.

The material 10 is an object to be coated, that is, a base made of metal or wood, and corresponds to a material of a structure such as a bridge or a steel tower.

On the other hand, the primer 20 is a lead-based, zinc-based, chromate-based, or iron oxide-based rust-preventive paint, which is applied after pretreatment such as degreasing and chemical conversion treatment on the material 10. It

On the other hand, the coating material 30 is obtained by mixing an anti-fire sand-based compounding agent obtained by crushing anti-fire stones with a solvent obtained by adding water to a water-soluble resin. Has a layer thickness of 1 to 1.
It is sprayed about 2 mm.

The coating film 40 is a general water-based or oil-based paint colored with a pigment, which is applied on the coating material 30 in a layer thickness of about 30 to 50 μm.

Next, the coating material 30 will be described in detail. As described above, the coating material 30 is formed by adding a compounding agent based on anti-fire sand obtained by crushing anti-fire stones, and water to a water-soluble resin. Obtained by mixing with a solvent.

Among these, the compounding agent is based on anti-fire sand, and cement, glass powder, crack preventive agent, organic water retention agent, organic thickening agent, and defoaming agent are added thereto. Preferably 60 to 70% by weight of the base anti-fire sand, 20 to 30% by weight of cement, 7 to 9% by weight of glass powder, and a crack preventive agent, an organic water retention agent, an organic thickener,
0.01 to 1% by weight of antifoaming agent, particularly preferably 66.40% by weight of anti-fire sand, 25.02% by weight of cement, 7.70% by weight of glass powder, 0.5 of a crack preventing agent.
The composition is 0% by weight, 0.20% by weight of an organic water retention agent, 0.13% by weight of an organic thickening agent, and 0.05% by weight of an antifoaming agent.

On the other hand, the solvent can be obtained by adding 1.25 times the weight ratio of water to the water-soluble resin. In addition,
Examples of the water-soluble resin include acrylic resin, phenol resin, alkyd resin, and amino resin, and it is particularly preferable to use the water-soluble acrylic resin.

As a method for producing the coating material 30, first, anti-fire sand, cement, glass powder, and a crack preventive agent, an organic water retention agent, an organic thickening agent, and an antifoaming agent are compounded at the above-mentioned compounding ratios, respectively. 25% to 35% by weight of a solvent obtained by adding water to a water-soluble resin,
Preferably, 30% by weight is added, and then the compounding agent and the solvent are stirred and mixed.

In particular, as a method for producing anti-fire sand, anti-fire stones (quartz trachyte volcanic rock produced in the Izu Islands, especially Niijima Island, which is rich in acid resistance and heat resistance, contains about 78% silicic acid and 13% alumina.
(Including iron oxide 1%, lime 1%, magnesium oxide 0.2%, manganese oxide 0.2%, potassium oxide 2.4%, sodium oxide 4.2%)
Was crushed with a crusher, and the firestone was 5 mm
It is made of anti-fire sand with a certain particle size.

Further, as the glass powder, general silicate glass is pulverized by a pulverizer into fine particles of about 2000 to 4000 cm 2 / g.

On the other hand, the mixing of the compounding agent and the solvent is carried out by using a predetermined stirrer for about 5 minutes.
The compounding agent and the solvent are mixed just before use.

By the way, examples of the cement include white Portland cement, ordinary Portland cement, silica cement and other Portland cement, and crack preventive agents include reinforcing fiber; air entraining agent; dispersant; fly ash. , As organic water retention agent, paraffin; sodium chondroitin sulfate, and as organic thickener, methyl cellulose; sodium cellulose glycolate; sodium alginate; propylene glycol alginate; phosphate starch, and defoaming Examples of the agent include silicones; fatty acid esters; metal soaps; long-chain alcohols.

In particular, white portland cement is most preferably used as a cement in terms of early strength and price, and as a crack preventive agent, carbon fiber or silicone carbide fiber in terms of adhesion to matrix and fatigue resistance. The most preferable is the use of the reinforcing fiber, the most preferable is the use of paraffin as the organic water retention agent from the viewpoint of water retention, the most preferable is the methyl cellulose because of the viscosity as the organic thickener, and the most effective defoaming agent. The use of silicones (silicone oil) is most preferable in terms of foamability.

By the way, if the compounding ratio of the anti-fire sand and the glass powder is more than a predetermined value, the composition tends to be slow-hardening, while if it is less, the acid resistance tends to decrease. Further, if the compounding ratio of cement is more than a predetermined value, the acid resistance and strength tend to decrease, while if it is less, the hardening tends to be slow.

Further, if the compounding ratio of the crack preventive agent, the organic water retaining agent, the organic thickening agent, and the defoaming agent is more than the predetermined value, the strength tends to decrease, while the crack preventing agent and the organic water retaining agent are mixed. If the amount is reduced, there is a risk of cracking during or after curing.If the amount of the organic thickening agent is reduced, the viscosity will be reduced, and spraying will be hindered.If the defoaming agent is reduced, stirring and mixing with the solvent will be performed. There is a tendency that the fire does not disappear and a smooth finished surface cannot be formed.

On the other hand, if the amount of the solvent added is larger than the predetermined value, the adhesive force of the coating film 40 tends to decrease, while if it is smaller, the lubricity and flexibility of the coating material 30 are impaired or gelled. Tend.

Next, the method of using the coating material 30 will be described. First, the coating material 30 produced as described above is sprayed onto the primer 20 with a spray gun, left for 2 to 3 hours, and then again coated with the coating material 30.
To spray.

Then, after curing for about 24 hours, a general coating material is applied to the surface of the coating material 30 to form a coating film 40.
To form.

As a method of spraying the coating material 30, a cup type or a pressure feeding type can be adopted, and as a form of the spray gun, various types such as a mortar gun and an airless pistol gun can be adopted. .

Next, the results of tests using the prescribed test pieces with five items of adhesion strength, abrasion resistance, impact resistance, salt spray resistance, and accelerated weather resistance are shown (Foundation Testing Center for Building Materials No. 5).
7101). The test piece used was a material (steel sheet) coated with a primer (anticorrosion paint), the coating material of the present invention, and a coating film (general water-based paint) in this order. In particular, for the adhesion strength test, in addition to the above-described test piece, three types were used: a material coated with only a primer, and a material coated with a primer and a coating material. For the salt spray resistance test, two diagonal lines that reach the material were used. On the other hand, the test method conforms to “JIS K 5400”, but in the impact resistance test, the falling ball type (height 50c
m), and the treatment time for salt spray resistance was 168 hours.

[0038]

[Table 1]

[0039]

[Table 2]

Referring to Table 1, it can be seen that the coating material of the present invention shows an extremely strong adhesion to the primer on the average of 208 N / cm 2 and the coating material to the coating material on the average of 146 N / cm 2. In particular, it can be seen that the adhesion of the primer to the material, the adhesion of the coating material to the primer, and the adhesion of the coating film to the coating material are gradually weakened. This means that the tensile force of each layer is relaxed and peeling is suppressed, and therefore each layer can be said to be attached in an ideal state.

On the other hand, referring to Table 2, it can be seen that the abrasion is extremely small, and the coating material as well as the coating material is not abnormal in impact resistance, salt water spray resistance and accelerated weathering resistance.

The coating material used in the test was 66.40% by weight of anti-fire sand, 25.02% by weight of cement, 7.70% by weight of glass powder and 0.5% of a crack preventive agent.
0% by weight, 0.20% by weight of an organic water retention agent, 0.13% by weight of an organic thickener, and 0.05% by weight of an antifoaming agent were added to a water-soluble acrylic compound. 1.2 for resin
30% by weight of a solvent containing 5 times the amount of water was used.

[0043]

Industrial Applicability The coating material of the present invention adheres extremely strongly to the material of the article to be coated or the base coating such as a primer applied to the material, and also has abrasion resistance, impact resistance, salt water spray resistance, It has been obtained as a test result that the accelerated weather resistance is also extremely excellent.

Therefore, it is possible to protect an object to be coated such as a bridge or a steel tower for a long period of time, and the repainting time can be extended more than twice as long as before, so that running cost such as repair cost can be reduced. It has an excellent effect.

Further, since the conventional coating material can be applied to the coating material, it does not spoil the aesthetic appearance. In particular, since the conventional coating material can be firmly adhered to the coating material of the present application, the conventional coating material can be applied. Even when it is applied to, it has an excellent effect that the repainting time can be extended.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which a material is coated with a coating material of the present invention.

[Explanation of symbols]

 10 material 20 primer 30 coating material 40 coating film

Claims (5)

[Claims] 1. A coating material obtained by mixing an anti-sand sand-based compounding agent obtained by crushing anti-fire stones with a solvent obtained by adding water to a water-soluble resin. 2. The compounding agent has a base anti-fire sand of 60 to 70.
% By weight, cement 20-30% by weight, glass powder 7
The coating material according to claim 1, wherein the composition comprises 0.01 to 1% by weight and a crack preventive agent, an organic water retention agent, an organic thickener, and an antifoaming agent, respectively, in an amount of 0.01 to 1% by weight. 3. The coating material according to claim 1, wherein the water-soluble resin is a water-soluble acrylic resin. 4. The coating material according to claim 1, wherein the solvent is mixed in an amount of 25 to 35% by weight with respect to the compounding agent. 5. An anti-fire sand made by crushing anti-fire stones in an amount of 60 to 7
0% by weight, 20 to 30% by weight of cement, 7 to 9% by weight of glass powder, and 0.01 to 1% by weight of a crack preventive agent, an organic water retention agent, an organic thickener, and a defoaming agent, respectively. 25 to 35% by weight of a solvent obtained by adding water to a water-soluble resin is added to the mixture to form a compounding agent, and then the compounding agent and the solvent are mixed by stirring. Production method.