JP2003047930A - Baked fly ash giving stable resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a raw material for a paint excellent in the affinity (wettability) with a resin component and oil absorbability, rich in corrosionproof properties, having coloration tolerance and compounding tolerance, excellent in storage stability and rich in coating workability using fly ash, to provide a coating excellent in the affinity (wettability) with the resin component and oil absorbability, rich in corrosionproof properties, having coloration tolerance and compounding tolerance, excellent in storage stability and rich in coating workability using the raw material, and to provide a raw material of a plastic structure excellent in molding flowability and high density filling properties and having high rigidity and high strength. SOLUTION: The baked fly ash is obtained by baking fly ash at a high temperature of 500 deg.C or higher, preferably, 600-800 deg.C. The filler for a resin composition or a widely used extender pigment for an organic paint comprises the baked fly ash. The coating prepared by adding the widely used extender pigment for the organic paint to a coating, more concretely, an epoxy-based coating is also disclosed.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a baked fly ash which gives a stable resin composition, and a resin composition containing the same, particularly a paint.

[0002]

2. Description of the Related Art In order to shield steel structures and concrete structures from rainwater and chemicals and protect them from corrosion, they are often covered with a coating film which is dense and does not easily peel off. Also, various structures are painted with colored paints to improve their aesthetics. The basic component of the coating material is a polymer material, but an inorganic powder called an extender pigment is added mainly for the purpose of increasing the amount, imparting coating film hardness, imparting thixotropy and the like. The required specifications for these inorganic powders vary depending on the application, but generally, the particle size is about 1 to 100 microns, the resin component has good affinity (wettability), but is inert, and the oil absorption is It is small, highly economical, has a high hardness equivalent to or higher than that of steel, and is preferably a light color system having a wide range of colorability.

Practically available powders are crushed calcium carbonate, flat talc, etc., but there are cases where the affinity (wettability) with the resin component is poor and some soluble components are present. There is a problem that the anticorrosion performance is deteriorated, and the fluidity of the powder itself is poor, so that the molding fluidity and the brush coatability at the time of coating are difficult. In addition, although comparatively good wettability fused silica powder and hydrated alumina powder are in the form of spheres, there are price difficulties, and silica powder equivalent substances, especially spherical substances, that can be provided in large quantities at low cost are available. Has been desired.

[0004]

On the other hand, fly ash, which is discharged in large quantities from coal-fired power plants, is a spherical substance, and when used as a concrete admixture, it is used as a molding material because it improves the fluidity of concrete. It is well known that the flow moldability is improved in some cases. Further, it is highly economical, has excellent affinity (wettability) with the resin, and has a hardness as high as silica powder, and substantially satisfies the above-mentioned required specifications. However, when fly ash was added to the main component of the epoxy-based paint to form a coating composition, and the main component and the curing agent were mixed within 3 days and brush coating was performed, the viscosity was normal and the workability was good. However, when I tried to paint by mixing the main component of the same coating composition that had been preserved one year later and the curing agent, the main component that had fly ash added increased viscosity and caking, making it practical. It could not be provided (see Comparative Example 5). In addition, since fine ash is attached to the surface of the fly ash, the oil absorption is large and the blending margin as an extender pigment is low.
Furthermore, the coating film immediately after preparation of the coating composition had a dark color tone, which was aesthetically problematic (see Comparative Example 11 and the like).

Therefore, the present invention uses fly ash, has excellent affinity (wettability) with resin components, excellent oil absorption, is excellent in anticorrosion, has a coloring margin and a compounding margin, and has storage stability. It is an object of the present invention to provide a raw material for a coating material which is excellent in coating workability as well as a raw material for a plastic structure which is excellent in molding fluidity and high dense packing property and has high rigidity and high strength. Further, the present invention uses the above-mentioned raw material for coating material,
To provide a coating material that has excellent affinity (wettability) with resin components, oil absorption, corrosion resistance, coloring tolerance, compounding tolerance, storage stability, and coating workability. Has an aim.

[0006]

According to the present invention, fly ash is treated at a high temperature of 500 ° C. or higher, preferably 600 ° C. or higher 80
The main point is calcined fly ash calcined at a high temperature of 0 ° C or less.

[0007] The gist of the present invention is a filler for a resin composition, which is composed of fired fly ash obtained by firing fly ash at a high temperature of 500 ° C or higher, preferably 600 ° C or higher and 800 ° C or lower.

The gist of the present invention is a general-purpose extender pigment for organic paints, which comprises a baked fly ash obtained by baking fly ash at a high temperature of 500 ° C. or higher, preferably 600 ° C. or higher and 800 ° C. or lower.

The present invention is a general-purpose organic paint comprising a paint, more specifically, an epoxy-based paint, and fly ash baked at a high temperature of 500 ° C. or higher, preferably 600 ° C. or higher and 800 ° C. or lower. The main point is a paint containing an extender pigment.

[0010]

DETAILED DESCRIPTION OF THE INVENTION Fly ash is a fine ash particle in flue gas, and usually has a shape close to a sphere. In the fly ash that has undergone partial incomplete combustion in the coal-fired power plant and has passed through the denitration device and the electrostatic precipitator, the amount of ammonia-based impurities (ammonium sulfate and its reaction product with fly ash) is 200 ~
About 1000 ppm, unburned carbon 15000-50
000ppm, iron oxide 10,000 to 50,000p
pm is included.

Ammonia-based impurities act on the functional groups (epoxy groups) of the epoxy resin, which is the main ingredient of the coating composition,
It has a property of causing a polymerization reaction or a cross-linking reaction to cause an increase in viscosity and caking. In addition, since fly ash contains silica as a main component, a large number of silanol groups are present on the surface, and these silanol groups act on the functional groups (epoxy groups) of the epoxy resin, which is the main ingredient of the coating composition, to cause polymerization. It has the property of causing a reaction or a cross-linking reaction, resulting in an increase in viscosity and caking.

For this reason, fly ash is exposed to high temperature air at 600 ° C. for about 4 hours to reduce the concentration of ammonia impurities to 1 ppm or less, and the amount of silanol groups has so far been established as an accurate quantitative method. Although it is unclear because it has not been treated, it is probably reduced to less than half, so that the curing reaction does not occur even after a long time in a state where 20 to 50% of the epoxy resin as the main component is mixed in an amount equivalent to 20%. It was a powder.

15000-5000 for fly ash
Fine unburned carbon of about 0 ppm adheres to the surface, has a small oil absorption amount, and has a low blending margin when blended as an extender pigment in a coating composition. In addition to unburned carbon, 1
The fly ash has a dark gray color due to the presence of iron oxide at a concentration of 0000 to 50,000 ppm. Therefore, fly ash is exposed to high temperature air of 500 ° C. or higher for about 20 hours to reduce the concentration of unburned carbon to about 1600 ppm, and black Fe ₃ O ₄ iron oxide is changed to brown Fe ₂ O ₃ iron oxide. The powder was converted into a pale yellow color by changing the colorant into a powder which can be colored in a pale color and which has excellent oil absorption.

Fly ash is filtered or classified at the stage of being collected by a dust collector or after being fired to adjust to a powder having an appropriate particle size according to the use. In particular, when it is used as an extender pigment for paint for the purpose of coating with an air gun, a pigment having a particle size of 100 μm or less is prepared to prevent clogging of the gun chip pigment.

When fired fly ash is used as an extender pigment, the affinity (wettability) with the paint resin component and the oil absorption are excellent, the coloring margin and the compounding margin are excellent, and the storage stability and the coating workability are excellent. , The coating film formed by coating and curing is highly anticorrosive,
Further, when the fired fly ash is used as the plastic filler, it has excellent molding fluidity and high dense packing property, and the obtained plastic structure has high rigidity and high strength.

The fired fly ash is preferably contained as a plastic filler in an amount of usually 1 to 900 parts by weight, preferably 60 to 800 parts by weight, based on 100 parts by weight of the resin solid content. It is desirable in that moldability and mechanical properties can be obtained. Fly ash content is 1
Below less than 100 parts by weight of resin solids,
Moldability and mechanical properties tend to be poor, and when it exceeds 900 parts by weight (based on 100 parts by weight of resin solid content), poor wettability of the aggregate, moldability and mechanical properties tend to become poor. is there. The fired fly ash is preferably contained as an extender pigment in an amount of usually 5 to 90% by weight, preferably 10 to 50% by weight in 100% by weight of the coating composition.

[0017]

[Function] In a paint system of a type in which a large amount of an extender pigment or an additive of 20% or more is mixed and manufactured in advance with an epoxy resin component to be a main agent, and a curing agent is mixed at the time of coating work, as an extender pigment, 500 ° C or more. By using the fly ash fired in the high temperature air described above, it is possible to provide a coating composition capable of good workability and good film formation even after 6 months or more have passed after the production. Further, the present fly ash has a small oil absorption amount and is excellent in compounding tolerance.

In a paint system of a type in which a large amount of 20% or more of volume pigments and additives are mixed and manufactured in advance with an epoxy resin component as a main agent and a hardener is mixed at the time of coating construction,
By using fly ash that is exposed to high temperature air of 500 ° C. or higher for about 20 hours as a light-colored pigment and baked so that the amount of unburned carbon becomes 1600 ppm or less,
A coating composition capable of forming a coating film having any color tone other than white can be provided by adding an appropriate coloring pigment.

If the firing is carried out for a longer time in the air of less than 500 ° C., for example, 450 ° C., the silanol groups and the amount of unburned carbon are reduced, and the same effect as firing at a high temperature of 500 ° C. or higher is obtained. However, since it takes a long time, its industrial value is considered to be poor. The temperature at which unburned carbon burns efficiently and the silanol groups can be efficiently reduced is 600 ° C or higher, and conversely, when it exceeds 800 ° C, aggregation and coloring (yellowing) of particles become severe,
It is considered that 600 ° C or higher and 800 ° C or lower is industrially preferable. However, it is considered that the method of baking at 800 ° C. or higher for a short time is superior for applications in which agglomeration and coloring of particles are not a problem. The firing method is not particularly limited, but in consideration of combustion efficiency, mass productivity, reduction of agglomeration, etc., firing using a rotary kiln furnace is superior.

[0020]

The details of the present invention will be described with reference to Examples. The present invention is not limited to these examples.

Examples 1 to 5 and Comparative Examples 1 to 3 The effects of fly ash baking treatment grade on the reactivity with the bisphenol A type epoxy resin having an epoxy group as a functional group and the oil absorption were investigated. In addition,
The firing treatment of the fly ash performed in each of the examples and the comparative examples was 10 mm without pressing the fly ash into an alumina biscuit container having a size of 200 × 200 × 50 mm.
It is a product that is stacked up to the height and fired in an electric furnace at a predetermined temperature for a time. The results of formulation and evaluation are shown in Table 1.
Each component used is as follows. "EP-827": Epoxy resin (manufactured by Yuka Shell Co., Ltd.) "Fly ash": Examples 1 to 5 have an average particle size of 5 µm.
100 mesh under (100 mesh passing is 99
% Or more), a light-colored powder containing silica-based oxide (50%) and alumina-based oxide (28%) [manufactured by Shikoku Electric Power Co., Inc.].
By firing at 500 ° C to 800 ° C, the amount of NH ₃ is reduced below the detection limit, and the concentration of unburned carbon is 1600p.
Reduced to pm or less and converted black Fe ₃ O ₄ iron oxide into brown Fe ₂ O ₃ iron oxide. Comparative Example 1 is Example 1
Is a non-fired fly ash, and Comparative Example 2 is the same fly ash fired at 200 ° C. for 4 hours.
Comparative Example 3 was baked at 450 ° C. for 12 hours. “Spherical silica”: Spherical silica having an average particle size of 5 μm obtained by spheroidizing natural crystalline silica powder by a thermal spraying method (manufactured by Denka Co., Ltd.).

<< Evaluation >> Reactivity is EP-827 at 170 ° C.
And fly ash every day for 5 minutes while mixing and stirring 17
The state after standing at 0 ° C. for 1, 5, 7, 15 days was visually evaluated. The NH ₃ amount was measured by heating the powder to be evaluated to 600 ° C., completely collecting the generated ammonia gas in an absorption bottle containing dilute sulfuric acid, and collecting it by the neutralization titration method specified in JIS K 0102. It is obtained by quantifying the amount of collected ammonium ions. The amount of unburned carbon is obtained from the weight loss when the fired sample is refired at 650 ° C. for 24 hours. The oil absorption was determined by the method using boiled linseed oil specified in JIS K 5101.

[0023]

[Table 1]

As is clear from Table 1, when the fly ash of the example was fired at 500 ° C. or higher, it was 170 ° C.
Even if the reaction with the epoxy resin is accelerated for 15 days, the viscosity increases and stays in a semi-solid state. On the other hand, the non-fired product of Comparative Example or the fly ash fired at 200 ° C. does not react with the epoxy resin. The reaction was fast and completely cured in 170 ° C. × 5 days, and even the one baked at 450 ° C. was completely cured in 7 days. The reason why the complete curing is faster in the unfired and 200 ° C. firing is probably the NH ₃ amount of 50 pp.
It is considered that the curing reaction was accelerated due to the remaining of m or more. At 450 ° C, the amount of NH ₃ is reduced to 1 ppm, which is a level that does not cause any problems, but in general, silanol groups are 5
It is said that the temperature is gradually reduced at a temperature of 00 ° C. or higher, and it is considered that the curing has been completed because many silanol groups remain. Since the commercially available spherical silica used in Comparative Example 4 is a thermal spraying type, it has few silanol groups on the surface and was not completely cured as in Example. Fly ash is also spheroidized at high temperature, but it is presumed that many silanol groups are generated in the subsequent treatment. Further, the oil absorption of fly ash was 29.0 ml / 100 g or less when fired at a temperature of 500 ° C. or higher in the example, and particularly 550 ° C. or higher at which unburned carbon amount was 900 ppm or lower 70
The oil absorption amount became 25.0 ml / 100 g or less by firing at 0 ° C. or less. However, there was a tendency that the oil absorption amount increased a little at 800 ° C. firing. Comparative example unbaked or 450
30.0m for fly ash fired at temperatures below ℃
It was 1/100 g or more, and the oil absorption was large.

Examples 6 to 12 and Comparative Examples 5 to 10 The effects of baking grades on the storage stability of paints were investigated. Each component used is as follows. Example 6
.About.11 and Comparative Examples 5 to 9 are commercially available slightly solvent type epoxy paints (solvent content is 3% by weight). Example 12 and Comparative Example 10 are commercially available solvent-based pure epoxy paints. “Fly ash”: firing conditions (air temperature, exposure time) of Examples 6 to 12 and Comparative Examples 6 and 7, NH ₃ amount (ppm), unburned carbon amount (ppm), average particle size (μ)
Table 2 shows m). Comparative Examples 5, 8 and 10 are unburned. Comparative Example 9 is of the current formulation that does not use fly ash. “Quartz sand”: crushed silica with an average particle size of 25 μm and unburned. "Calcium carbonate": average particle size 25 μm, unburned.

<Evaluation> The rate of increase in viscosity was measured by measuring the viscosity at the initial stage and after leaving at 50 ° C. for 30 days (temporarily returning to 20 ° C. at the time of mixing) and mixing and stirring the main agent and the curing agent at a predetermined ratio. (%) = (Viscosity after standing for 30 days-initial viscosity) × 100 / initial viscosity was determined. Rotational viscometer (Visco Tester VT-04 type, manufactured by Rion Co., measurement range 0.3-4000 poise, using rotor No. 2)
Was performed using. The results of formulation and evaluation are shown in Table 2. In addition, in the slightly solvent-type epoxy paint formulations of Examples 6 to 11 and Comparative Examples 5 to 9, the mixing ratio of the main agent / curing agent was 2/1, and in the solvent-type pure epoxy paint formulations of Example 12 and Comparative Example 10. , Mixing ratio of main agent / hardener is 1
Mixed 7/3.

[0027]

[Table 2]

As is clear from Table 2, in the case where the fly ash was not fired or in Comparative Examples 5 to 8 and 10 where the firing temperature was 450 ° C. or less, the viscosity increased by about 15 to 50%. In Example 6 fired at 500 ° C, there was a slight viscosity increase of 5%, but 550 ° C
In Examples 7 to 12 fired as described above, there is no increase in viscosity at all, and Comparative Example 9 is a current product containing no fly ash.
No difference was found. From this, it is understood that the fly ash baked at 500 ° C. or higher has excellent storage stability. The viscosity increase becomes more remarkable in the slightly solvent type epoxy paint as compared with the solvent type pure epoxy paint blending, but this is considered to be because the solvent type is diluted with the solvent and the reaction is delayed. In addition, it can be seen from Comparative Examples 5 and 8 that the viscosity increase increases as the average particle size decreases. It is considered that this is because when the average particle size is small, the surface area is large and the silanol group and the amount of amine impurities are large.

Examples 13 to 15 and Comparative Examples 11 to 12 The effect of the baking grade on the colorability of the paint was investigated. Examples 13 to 15 are blends of calcined fly ash calcined at 600 ° C. to 800 ° C. for 4 hours, and Comparative Example 1
No. 1 is a blend of fly ash without firing, and Comparative Example 12 is a white blend of the current modified epoxy resin paint containing no fly ash. The curing agents are all common, and the composition is shown in Table 3. << Evaluation >> Examples 13 to 15 and Comparative Examples 11 to 12 In the solvent type modified epoxy coating composition, the mixing ratio of the main agent / curing agent was 18/2. The mixed and mixed paint was applied on a blasted steel plate to a thickness of 200 μm, and the hue thereof was compared with a standard color sample book for paint (published by Japan Paint Industry, 2001 edition).

[0030]

[Table 3]

The current white composition of Comparative Example 12 which does not use fly ash is white with a Munsell value of N9.5, while Comparative Example 11 which contains no fly ash firing.
Then, the Munsell value was N8 and the color was gray. In Example 13 in which the baked fly ash fired at 600 ° C. for 4 hours was blended, the Munsell value was 2.5Y9 / 1, which was a pale color close to white, and in Example 14 fired at 700 ° C. for 4 hours, the Munsell value was 10YR8. In Example 15 fired at 0.5 / 1 and 800 ° C. for 4 hours, it was observed that the Munsell value was 10YR9 / 1.5 and the yellow color tended to become slightly stronger as the temperature increased, but it was a pale color close to white. From this, it is understood that the burned fly ash can suppress the original gray coloring of fly ash to a coloring of a light color by burning and removing unburned carbon.

Examples 16 to 20 are blends of calcined fly ash calcined at 700 ° C. for 4 hours, and Comparative Example 13
Nos. 17 to 17 are blended with current silica-based pigments without using fly ash, calcium carbonate and the like. Example 16-
Tables 4 to 8 show the blends of the base material and curing agent of No. 19 and Comparative Examples 13 to 16 and the blends of Example 20 and Comparative Example 17.

[0033]

[Table 4]

[0034]

[Table 5]

[0035]

[Table 6]

[0036]

[Table 7]

[0037]

[Table 8]

Example 16 The main ingredient of the epoxy putty material for solventless concrete was
Firefly ash (average particle size 25μ
m) 40% by weight was added as extender pigment and the properties of the paint were tested. A current curing agent was used as the curing agent, and the main agent / curing agent = 2/1 (weight ratio) was mixed.

Comparative Example 13 Epoxy putty material for current solventless concrete. The same curing agent as in Example 16 was used.

1) Paint properties: When the particle size was smaller than that of the current pigment, the oil absorption was large, so the viscosity of the putty increased slightly, and the workability of putting putty deteriorated. Workability can be improved by adjusting the particle size. 2) Quality test results Test item (1) Alkali resistance quality standard: No blister, swelling, peeling, softening, or elution of test results: Test results for both Example 16 and Comparative Example 13 swelling, swelling, peeling of coating No softening / elution, good (2) Adhesion quality standard: 25/25 Test result: 25/25 in both Example 16 and Comparative Example 13
3. Good Test Method Japan Road Association [Guideline for salt damage countermeasures for road bridges (draft) / commentary] 4. Alkali resistance test and adhesion test of the quality of coating materials were carried out. -Alkali resistance test: JIS K 5400 7.4 Soak in saturated calcium hydroxide solution for 30 days-Adhesiveness: Cut with a cutter knife at 2 mm intervals to form cuts reaching the base material to form 25 squares. Stick cellophane adhesive tape (JIS Z1522) on it so that it completely adheres, and then peel off the tape at a stretch. Check the number of remaining eyes. 3) Evaluation of results ・ Practical in terms of performance.・ In terms of workability, it is better to increase the particle size.

Example 17 Solvent-based pure epoxy resin coating composition containing 700 ° C.
Fly ash (average particle size 5 μm) calcined for 4 hours was added as an extender pigment to test the properties of the paint. Curing agent uses current curing agent, main agent / curing agent = 17/3 (weight ratio)
Mixed in.

Comparative Example 14 Current solvent-type pure epoxy resin coating material. The same curing agent as in Example 17 was used.

1) Test Results Item (1) Dispersion Comparative Example Product: 20 μm (Method B) Example Product: 20 μm (Method B) (2) Paint Viscosity Comparative Example Product: 110 KU (25 ° C.) Example Product: 112 KU (25 ° C.) (3) Appearance of coating film Comparative example product: Good Example product: Good (4) Wetting property Comparative example product: 350 μm Passed Example product: 350 μm Passed (5) Storage stability (50 ° C. × 30 days) Comparative example product: Good without precipitation and thickening (viscosity increase 2 KU) Example product: Good without precipitation and thickening (viscosity increase 1 KU) (6) Salt spray resistance (JIS K 5400 9.1) Comparative example product: 240 No time abnormality Example product: 240 hours No abnormality (7) Composite cycle corrosion resistance (JIS K5621 5.
11) Comparative example product: 90 cycles no abnormality Example product: 90 cycles no abnormality (8) Moisture resistance (JIS K5400 9.2) Comparative example product: No abnormality for 560 hours Example product: No abnormality for 560 hours (9) Water resistance Property (20 ° C, tap water immersion) Comparative example product: No abnormality for 28 days Example product: No abnormality for 28 days (10) Salt water resistance (20 ° C, 3% saline solution immersion) Comparative example product: No abnormality for 28 days Example: No abnormalities for 28 days Test method Dispersion B method is based on the JIS K 5400 4.7.2 linear method. KU value of viscosity is JIS K 540
0 4.5.2 by Stormer viscometer method. 2) Evaluation ・ As a result of replacing a part of the existing extender pigment (talc) with calcined fly ash, it can be evaluated that there is no problem in replacement. The results of the durability test (corrosion resistance, water resistance) of the coating film were also good.

Example 18 A fly ash (average particle size: 5 μm) calcined at 700 ° C. for 4 hours was added as an extender pigment to the main component of a solvent-type modified epoxy resin paint, and the properties of the paint were tested. A current curing agent was used as the curing agent, and the main agent / curing agent was mixed at 18/2 (weight ratio).

Comparative Example 15 Current solvent-type modified epoxy resin coating material. The curing agent is Example 18
The same thing was used.

1) Test Result Items (1) Dispersion Comparative Example Product: 20 μm (Method A) Example Product: 20 μm (Method A) (2) Paint Viscosity Comparative Example Product: 101 KU (25 ° C.) Example Product: 102 KU (25 ° C) (3) Appearance of coating film Comparative example product: Good Example product: Good (4) Wetting property Comparative example product: 250 μm Passed Example product: 250 μm Passed (5) Storage stability (50 ° C x 30 days) Comparative example product: Good without precipitation and thickening (viscosity increase 4KU) Example product: Good without precipitation and thickening (viscosity increase 4KU) (6) Salt spray resistance (JIS K 5400 9.1) Comparative example product: 240 No time abnormality Example product: 240 hours No abnormality (7) Composite cycle corrosion resistance (JIS K5621 5.
11) Comparative example product: 90 cycles no abnormality Example product: 90 cycles no abnormality (8) Moisture resistance (JIS K5400 9.2) Comparative example product: No abnormality for 560 hours Example product: No abnormality for 560 hours (9) Water resistance Property (20 ° C, tap water immersion) Comparative example product: No abnormality for 28 days Example product: No abnormality for 28 days (10) Salt water resistance (20 ° C, 3% saline solution immersion) Comparative example product: No abnormality for 28 days Example product: 28 days no abnormality Test method Dispersion A method is based on the distribution chart method of JIS K5400 4.7.1. 2) Evaluation-As a result of replacing a part of the extender pigment with calcined fly ash, it can be evaluated that there is no problem in replacement. The results of the durability test (corrosion resistance, water resistance) of the coating film were also good.

EXAMPLE 19 Fly fly ash (average particle size: 2) was used as a main agent and a curing agent for a slightly solvent type ultra-thick film epoxy resin coating, which was baked at 700 ° C. for 4 hours.
5 μm) was added as an extender pigment to test the properties of the paint. The main component / curing agent = 2/1 (weight ratio) were mixed.

Comparative Example 16 Current micro solvent type super thick film epoxy resin paint.

1) Test result item (1) Paint viscosity comparative example product: Main agent 170 poise, curing agent 140 poise, mixture 140 poise Example product: Main agent 180 poise, curing agent 140 poise, mixture 150 poise (2) Coating film Appearance Comparative example product: Good Example product: Good (3) Sagging property Comparative example product: 2.5 mm Pass Example product: 2.5 mm Pass (4) Storage stability (50 ° C x 30 days) Comparative example product: Main agent Good (viscosity increase 0 poise), curing agent good (viscosity increase 10 poise) Example product: Main agent good (viscosity increase 0 poise), curing agent good (viscosity increase 10 poise) (5) Temperature difference water resistance test (50 ° C / Comparative product: No abnormality for 28 days Example product: No abnormality for 28 days (6) 40 ° C salt water immersion Comparative example product: No abnormality for 28 days Example product: No abnormality for 28 days 2) Evaluation Current extender pigment ( We also considered replacing some of the silica sand and talc), It was not a problem with the place come. When 20% or more is replaced, the viscosity becomes high and a difference in appearance (gloss) of the coating film occurs. Therefore, when considering viscosity and gloss, 20% is considered to be the limit replacement amount. As a result of the temperature difference water resistance test that accelerated the swelling deterioration phenomenon due to water permeation of the coating film performed as a long-term durability test of the coating film and the 40 ° C salt water immersion test that accelerated salt water permeability, good results It was found that the water resistance and the water resistance were also good.

Example 20 The properties of the paint were tested by adding a fly ash (average particle size: 5 μm) calcined at 700 ° C. for 4 hours as an extender pigment to the solvent one-pack oil rust preventive paint.

Comparative Example 17 Current solvent 1-pack oil-based rust preventive paint.

1) Test Results Item (1) Dispersion Comparative Example Product: 50 μm (Method A) Example Product: 50 μm (Method A) (2) Paint Viscosity Comparative Example Product: 88 KU (25 ° C.) Example Product: 89 KU (25 ° C) (3) Appearance of coating film Comparative example product: Good Example product: Good (4) Wetting property Comparative example product: 250 μm Passed Example product: 250 μm Passed (5) Storage stability (50 ° C x 30 days) Comparative example product: Good without precipitation and thickening (viscosity increase 2 KU) Example product: Good without precipitation and thickening (viscosity increase 3 KU) 2) Evaluation It can be seen that the composition can be applied as an extender pigment for oil-based rust preventive paints. Baking fly ash can be applied to paint systems other than epoxy resin paints, and can be used if price conditions are satisfied.

[0053]

EFFECT OF THE INVENTION A fly ash filler for a stable resin composition can be provided. Using the present fly ash fired at an appropriate temperature, it is possible to provide a coating composition capable of good workability and good film formation even after 6 months or more have passed since the production. Further, the present fly ash has a small oil absorption amount, is excellent in compounding tolerance, and can provide a coating composition capable of forming a coating film of any color tone other than white by adding a suitable coloring pigment. it can.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C09D 163/00 C09D 201/00 201/00 B09B 3/00 303L (72) Inventor Go Takayama, Kagawa Prefecture Yashima Nishimachi 2109 8 Shikoku Research Institute F-term (reference) 4D004 AA37 BA10 CA30 DA03 DA20 4J002 AA001 DM006 FA086 FB016 FD016 GH00 4J037 AA08 CC23 DD27 EE26 FF01 FF17 4J038 DB001 EA011 HA566 KA08 NA11 NA23 NA23 NA

Claims (6)

[Claims] 1. A fired fly ash obtained by firing fly ash at a high temperature of 500 ° C. or higher. 2. Fly ash at 600 ° C. or higher and 800 ° C.
Fired fly ash fired at the following high temperatures. 3. A filler for a resin composition, which comprises the fly ash according to claim 1. 4. A general-purpose extender pigment for organic paints comprising the fly ash of claim 1 or 2. 5. A paint containing the pigment according to claim 4 in the paint. 6. The coating composition according to claim 5, wherein the coating composition is an epoxy-based composition.