JP2007099832A - Organic zinc-rich coating composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic zinc-rich coating material providing a coated film having a high friction coefficient while keeping the advantage of an organic zinc-rich coating material to an inorganic zinc-rich coating material. <P>SOLUTION: The organic zinc-rich coating material contains (A) a zinc powder, (B) an organic binder comprising a butyral resin, an epoxy resin, a phenol resin, an acryl resin, a polyester resin and a fluororesin, and (C) an acicular pigment having 5-200 μm major diameter and 10-400 aspect ratio. Preferably, the binder is the butyral resin or the epoxy resin, and the acicular pigment is acicular aluminum borate. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a high-friction organic zinc rich paint composition that is excellent in rust prevention and is suitable for use in bolting and joining steel materials.

  Since zinc rich paint contains a lot of voids in the coating film, if the coating method such as so-called mist coating method is not used to replace the voids with the paint, foaming of the top coating is caused and further coating steps are required. High-quality substrate preparation, such as surface cleaning such as rust removal and surface treatment such as roughening, for example, blast pretreatment, before application to steel and other applicable base materials There is a difficulty that is required.

  In contrast, organic zinc-rich paints are less likely to cause such inconveniences and are advantageous compared to inorganic zinc-rich paints in that the requirement for adjusting the substrate is relaxed. However, it is inevitable that its use as a zinc-rich paint for friction bonding of high-strength bolts and a slightly improved one has been proposed (see Patent Document 1), but it is not sufficient.

JP-A-10-235286 (Claims and others)

  The subject of this invention is providing the organic zinc rich paint with a high friction coefficient, maintaining the advantage of the organic zinc rich paint with respect to an inorganic zinc rich paint mentioned above in such a situation.

  As a result of various studies to develop an organic zinc rich paint composition having the above-mentioned preferable characteristics, the present inventors have found that a specific resin-based binder and a needle-like composition as a composition component to be blended in zinc powder. By adopting a combination of pigments, it has been found that the intended problem can be achieved, and the present invention has been made based on this finding.

That is, the present invention is as follows.
(1) (A) zinc powder, (B) butyral resin, epoxy resin, phenol resin, acrylic resin, polyester resin, organic binder composed of fluororesin, and (C) major axis 5 to 200 μm, aspect ratio 10 to An organic zinc rich paint composition comprising 400 acicular pigments.
(2) The organic zinc rich paint composition according to the above (1), wherein the zinc powder of the component (A) has an average particle diameter of 1 to 50 μm.
(3) The organic zinc rich paint composition according to (1) or (2), wherein the organic binder of component (B) is a butyral resin or an epoxy resin.
(4) The acicular pigment of component (C) is acicular aluminum borate, acicular potassium titanate, acicular silicon carbide, acicular silicon nitride, acicular calcium carbonate, acicular basic magnesium sulfate, acicular zinc oxide The organic zinc rich paint composition according to any one of the above (1) to (3).
(5) The organic zinc rich paint composition according to the above (4), wherein the acicular pigment is acicular aluminum borate.
(6) The blending ratio is 50 to 93% for component (A), 5 to 35% for component (B), and ) The organic zinc rich paint composition according to any one of (1) to (5), wherein the content is in the range of 2 to 15%.
(7) The organic zinc rich paint composition according to any one of (1) to (6), further comprising (D) a non-acicular pigment.
(8) The organic zinc rich paint composition according to the above (7), wherein the non-needle pigment has a Mohs hardness of 5 or more.
(9) The organic zinc rich paint composition according to (8), wherein the non-acicular pigment is granular aluminum borate.
(10) (7) thru | or (9) the mixture ratio of the non-acicular pigment of (D) component is the range of 1: 9-9: 1 with respect to the acicular pigment of (C) component by mass ratio. ) The organic zinc rich paint composition according to any one of the above.
In the present invention, zinc powder means zinc or an alloy mainly composed of zinc, that is, a zinc-based alloy powder or fine flakes.

  In the coating composition of the present invention, the zinc powder of the component (A) is not particularly limited as long as it is usually used in the coating composition, but usually has an average particle size of 1 to 50 μm, preferably Is a powder having a thickness of 2 to 45 μm, more preferably 3 to 40 μm, and flakes having an average diameter of 3 to 30 μm and an average thickness of 0.5 to 2 μm are preferable in terms of coating work.

  Further, the organic binder of the component (B) is not particularly limited as long as it is usually used for zinc rich paint, but preferably a butyral resin, an epoxy resin, a phenol resin, an acrylic resin, a polyester resin, Of these, a butyral resin and an epoxy resin are preferable because they provide a high coefficient of friction to the fluororesin, particularly the coating film.

Further, the acicular pigment of component (C) has a major axis of 5 to 200 μm, preferably 5 to 100 μm, and an aspect ratio of 10 to 400, preferably 20 to 150. For example, acicular aluminum borate, acicular Examples include potassium titanate, acicular silicon carbide, acicular silicon nitride, acicular calcium carbonate, acicular basic magnesium sulfate, acicular zinc oxide and the like. Aluminum, acicular potassium titanate, especially acicular aluminum borate are preferred.
These needle pigments may be used alone or in combination of two or more.

  In the coating composition of the present invention, the blending ratio of the component (A), the component (B) and the component (C) is based on the mass, and is based on the total amount of the component (A), the component (B) and the component (C). (A) Component 50 to 93%, (B) Component 5 to 35%, and (C) Component 2 to 15%, (A) Component 55 to 88%, (B) Component 10 to 32%, and (C) It is preferable to set the content within the range of 2 to 13% of the component, particularly 60 to 84% of the (A) component, 13 to 30% of the (B) component, and 3 to 10% of the (C) component.

  If the component (A) is less than the above range, the rust preventive power of the coating will be reduced and a sufficient rust prevention effect will not be expected. If it is too much, the coating workability will deteriorate due to dust generation, etc. A film cannot be obtained, and the adhesion of the coating film to the material is reduced.

  If the amount of the component (B) is too small, it becomes dust spray at the time of coating, and the adhesion of the coating film to the material is reduced. If it is too much, the coating performance such as the rust prevention ability of the coating film is lowered.

  If the amount of the component (C) is too small, a coating film having a high friction coefficient cannot be obtained. If the amount is too large, the coating film performance such as the rust-preventing power of the coating film is lowered, and the coating workability is also lowered.

The coating composition of the present invention may further contain a non-needle pigment as the component (D), and the non-needle pigment can improve the coefficient of friction of the coating composition when the Mohs hardness is higher. Therefore, those having a Mohs hardness of 5 or more, particularly those having a Mohs hardness of 6 or more are preferable. Examples of such a material include granular aluminum borate, quartz, yellow stone, steel balls, diamond, and the like. Two or more kinds may be used in combination.
The blending ratio of the non-acicular pigment of component (D) is preferably in the range of 1: 9 to 9: 1 with respect to the acicular pigment of component (C) by mass ratio. It is good in that it provides a good coefficient of friction and rust prevention.

  In the coating composition of the present invention, it is preferable to add a solvent usually used in a zinc rich coating composition because the composition components can be dissolved or dispersed. Examples of such solvents include alcohols such as isopropanol and butanol, glycol ethers such as 1-methoxy-2-propanol or propylene glycol monomethyl ether, aromatic hydrocarbons such as toluene and xylene, ketones such as methyl ethyl ketone and cyclohexanone. And esters such as ethyl acetate, butyl acetate, and propylene glycol monomethyl ether acetate.

  In the coating composition of the present invention, additive components usually used in the coating composition, for example, extender pigments, rust preventive pigments, coloring pigments, anti-sagging agents, anti-glare agents, and the like, as long as the object of the present invention is not impaired. Foaming agents, leveling agents, dispersants, anti-settling agents, plasticizers, stabilizers, and the like can be blended.

  Examples of extender pigments include silica, talc, clay, kaolin, mica, zinc white, barium sulfate, calcium carbonate, alumina, zinc oxide, magnesium carbonate, barium carbonate, bentonite, etc., preferably talc, zinc oxide, Calcium carbonate, mica and barium sulfate are used.

  Examples of the rust preventive pigment include a chromium pigment, a lead pigment, a borate pigment, a phosphate pigment, and a molybdate pigment. Preferably, the rust preventive property can be further improved. Therefore, phosphate pigments and molybdate pigments are used. Examples of the phosphate pigment include zinc phosphate, aluminum phosphate, calcium phosphate, zinc aluminum phosphate, calcium zinc phosphate, phosphorous zinc silicate, zinc-treated aluminum phosphate, and molybdate pigments. Examples include calcium molybdate, aluminum phosphomolybdate, zinc molybdate, calcium calcium molybdate, and zinc phosphomolybdate.

  Examples of the colored facial department include brown, titanium white, carbon black, aniline black, gunjo, cadmium yellow, chrome yellow, lead white, watching red, organic blue such as cyanine blue, and organic green such as phthalocyanine green. Examples of the anti-settling agent include organic bentonite, polyethylene oxide, and aerosil.

  The coating composition of the present invention is practically provided in the form of a two-can set in which a coating liquid and a mixture of zinc powder and a predetermined pigment are separately provided. The can components of the above set may be sufficiently mixed and stirred with a stirrer or the like at the time of coating, and then used. The coating on the steel material may be performed by a normal coating method such as mechanical coating with an appropriate coater such as spray, dipping, brush coating, roll coater, etc., and drying after coating may be performed by natural drying or hot air drying operation. Good. The coating composition of the present invention exhibits excellent anticorrosion properties, rust prevention properties, and bolting joining properties when used for steel materials that can be bolted.

  The organic zinc rich paint composition of the present invention is excellent in rust prevention, excellent in bolted joining of steel materials, and can increase the sliding frictional force particularly by applying to the joint surface in the bolted joint portion of steel materials, and therefore , Steel structures and steel structures that can be bolted, such as roads, bridges, railways, harbors, buildings, factories, prefabricated houses, power plants, towers, amusement parks, pools, and other entertainment and amusement facilities are required. It is suitable for the intended use.

Next, the best mode for carrying out the present invention will be described in more detail by way of examples, but the present invention is not limited to these examples.
The coefficient of friction for the test specimen was calculated from the load at which slip occurred by the tensile test of the specimen and this load and the bolt tightening load.
In addition, the ratio of the composition component in paint preparation is based on a mass reference | standard.

Comparative Examples 1-3
Each paint composition was prepared by mixing each main ingredient composition component and curing solution shown in Table 1 below immediately before coating.
Next, these paints were applied to a blast-treated steel plate (treated grade ISO Sa 2.5) so as to have a dry film thickness of 75 μm and allowed to dry naturally for 2 weeks. The friction coefficient was measured for each of the test specimens prepared by fastening two coated steel sheets obtained in this way with two joining plates on the outer surface and fastening them with F10T using high strength bolts. Their measured values are also shown in Table 1.

Examples 1-9
In the same manner as in Comparative Examples 1 to 3, each main component composition component and curing solution shown in Table 1 below are mixed immediately before coating to prepare a coating, and these coatings are applied to a blasted steel plate and dried. The coefficient of friction was measured for each test specimen prepared by attaching an attachment plate to the coated steel plate and tightening with a high-strength bolt. Their measured values are also shown in Table 1.

Note 1): Epoxy resin 2001
Note 2): Epoxy resin 1001 60% clear solution Note 3): Butyral resin BX-5 20% solution The product names in the table are as follows.
YS2B: Shikoku Kasei Co., Ltd., acicular aluminum borate (average fiber diameter 0.5-1.0 μm, average fiber length 10-30 μm)
YS3A: Shikoku Kasei Co., Ltd., acicular aluminum borate (average fiber diameter 0.5-1.0 μm, average fiber length 10-30 μm)
PC30: manufactured by Shikoku Kasei Co., Ltd., granular aluminum borate PC30 (high): manufactured by Shikoku Kasei Co., Ltd., high hardness granular aluminum borate Thalene 7300-20: manufactured by Kyoeisha Chemical Co., Ltd., fatty acid amide-based anti-blocking agent 2105C: manufactured by Three Bond Co., Ltd. Polyamideamine-based curing agent Sanmide 390-70: manufactured by Air Products Japan, modified polyamideamine-based curing agent In addition, XY in the table is a tentative name for xylene and PGME is propylene glycol monomethyl ether, XY-PGME (1: 1) Means a mixed solvent of XY and PGME in a mass ratio of 1: 1, and XY-PGME (4: 1) means a mixed solvent of XY and PGME in a mass ratio of 4: 1.

  As can be seen from Table 1, the coating composition of Comparative Example 2 is different from that of Comparative Example 1 in that the amount of zinc powder is changed to 71.2% by mass, and further, 5.0% by mass of silica is used as a pigment for the composition component. It was prepared in the same manner as in Comparative Example 1 except that

  Further, as is clear from Table 1, the coating compositions of the following examples are as follows.

  That is, the coating composition of Example 1 was prepared in the same manner as Comparative Example 2 except that 4% by mass of YS2B and 1% by mass of PC30 were used as the pigment instead of silica.

  The coating composition of Example 3 was prepared in the same manner as in Example 2 except that the doses of YS2B and PC30 were changed to 8.5% by mass and 1.0% by mass, respectively.

  The coating composition of Example 5 was prepared in the same manner as in Example 4 except that the doses of YS2B and PC30 were changed to 1.0% by mass and 4.0% by mass, respectively.

  The coating composition of Example 6 was prepared in the same manner as Example 2 except that YS3A and PC30 (high) were used instead of YS2B and PC30, respectively.

  The coating composition of Example 7 was prepared in the same manner as in Example 6 except that the doses of YS3A and PC30 (high) were changed to 8.5% by mass and 1.0% by mass, respectively.

  The coating composition of Example 9 was the same as Example 4 except that the doses of zinc powder and YS2B were changed to 66.5% by mass and 8.5% by mass, respectively, and PC30 (high) was used instead of PC30. It was prepared.

  From Table 1, the predetermined pigment is used not only for the case where the coating composition of Comparative Example 1 is used but also for the case where the coating compositions of Comparative Examples 2 and 3 having a higher friction coefficient are used. It can be seen that the friction coefficient is dramatically improved when the coating composition of each example prepared using the above is used.

Claims (10)

  (A) Zinc powder, (B) Butyral resin, Epoxy resin, Phenol resin, Acrylic resin, Polyester resin, Organic binder composed of fluororesin, and (C) Needle with major axis 5-200 μm, aspect ratio 10-400 Organic zinc rich paint composition comprising a pigment.   2. The organic zinc rich paint composition according to claim 1, wherein the zinc powder of component (A) has an average particle size of 1 to 50 [mu] m.   The organic zinc rich paint composition according to claim 1 or 2, wherein the organic binder of component (B) is a butyral resin or an epoxy resin.   The acicular pigment as component (C) is acicular aluminum borate, acicular potassium titanate, acicular silicon carbide, acicular silicon nitride, acicular calcium carbonate, acicular basic magnesium sulfate, or acicular zinc oxide. Item 4. The organic zinc rich paint composition according to any one of Items 1 to 3.   The organic zinc rich paint composition according to claim 4, wherein the acicular pigment is acicular aluminum borate.   The blending ratio is, based on mass, (A) component 50 to 93%, (B) component 5 to 35% and (C) component 2 with respect to the total amount of component (A), component (B) and component (C). The organic zinc rich paint composition according to any one of claims 1 to 5, which is in a range of -15%.   The organic zinc rich paint composition according to any one of claims 1 to 6, further comprising (D) a non-acicular pigment.   The organic zinc-rich paint composition according to claim 7, wherein the non-needle pigment has a Mohs hardness of 5 or more.   The organic zinc-rich coating composition according to claim 8, wherein the non-acicular pigment is granular aluminum borate.   The blending ratio of the non-acicular pigment of the component (D) is in a range of 1: 9 to 9: 1 with respect to the acicular pigment of the component (C) in mass ratio. Organic zinc rich paint composition.