JPS61291661A - Zinc-containing paint using ether/alcohol mixture as liquid organic vehicle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to paints containing zinc. More specifically,
This invention relates to improving the corrosion resistance of zinc-containing coatings.

It is estimated that a full 40% of conventional technology steel production is spent replacing steel rendered useless by corrosion. [Dipid Pierce (see David Easy)]
. In the United States, corrosion costs 700,000 yen each year.
Over a billion dollars. [Roebuck,
Journal of Protective Coatings & Linings, July 1984, page 38].

Methods for making zinc-containing paints are well known in the art.

U.S. Patent No. 4,086,096, U.S. Patent No. 4,110,117,
and No. 4,417,007 describes in detail known techniques for producing zinc-containing paints.

For a long time, efforts have been made to increase the protective properties of zinc-containing paints. Many improvements have been tried and found to be effective. For example, US Pat. No. 4,110,117 strengthened zinc paints by adding certain chromates, boron compounds, silicates, etc.

David Litter Laboratories
Itter Laboratories) reports that the combination of ground hydrated mica and zinc particles improves the corrosion resistance of zinc-containing paints. (See American Indian and Kotei/Daz Journal, July 16, 1973, pp. 54-63). However, there still exists a need to further improve the corrosion protection provided by zinc-containing coatings.

SUMMARY OF THE INVENTION In one aspect, the present invention provides a zinc-containing paint. The zinc-containing coating formulation comprises: (a) an amount of zinc-containing particulate solids sufficient to enhance the corrosion protection properties of the coating; (1)) when the coating is applied to a corrosive substrate for corrosion protection purposes, the coating is applied to a corrosive substrate; a binder in an amount sufficient to bind the paint;
and (c) a liquid organic vehicle in an amount sufficient to disperse the zinc-containing particulate solid; wherein the vehicle is of the formula: (1) R-0-, R1-OH, where R is alkyl and R1 and (2) a second ether alcohol of the formula R2-0-R3-OH, where Ft2 is alkylene and R is alkylene; The first ether alcohol and the second ether alcohol are different in that the mixture improves the corrosion resistance of the paint compared to paints using either one of the above two types of ether alcohols as a solvent. It is characterized by containing sufficient proportions of primary and secondary ether alcohols.

In a second aspect, the present invention provides a coating comprising a zinc-containing paint after the zinc-containing paint formulation described above has been applied to a corrosive substrate and dried or cured.

In a third aspect, the invention provides an erodible substrate having a coating thus obtained.

The zinc-containing coatings of the present invention are useful corrosion inhibitors for many substrates, especially corrosive substrates such as steel, iron, and galvanized surfaces.

The zinc-containing particulate solids used in the zinc-containing coatings of the present invention are suitably dispersed in a liquid organic vehicle containing a binder and contain metallic zinc which, when applied to a corrosive substrate, increases the corrosion resistance of said substrate. It is a granular solid. Examples of suitable particulate solids have an average particle size of less than about 100 μm, more preferably about 50 μm.
The zinc dust is smaller than 1 μm, optimally smaller than about 10 μm. It is generally desirable for the average particle size to be greater than about 2 μm, and optimally greater than about 4 μm. Therefore, the average particle size of the zinc dust is about 100 μm to about 2 μm, preferably about 1 μm.
It ranges from 0 μm to about 4 μm.

Of course, the commonly used zinc powder has zinc oxide on its surface. Relatively pure zinc dust is commercially available and is preferred. Other zinc dusts containing some copper, iron, lead or chromium are less preferred because the coating compositions obtained using this type of zinc dust have relatively poor corrosion protection.

When the zinc metal in the coating composition is zinc flake, it preferably has a particle size of about 300 mesh or less.

The zinc flakes are preferably non-lobed and flat.

Zinc flakes are preferably made of zinc powder or powder of an alloy of zinc with a metal higher in the electrochemical series than iron (e.g. aluminum or magnesium) in a lubricating and antioxidant solvent (e.g. a relatively high-boiling but volatile solvent). made by ball milling in the presence of aromatic solvents).

The binder used in the coating formulation of the present invention may be any of the numerous well-known resins commonly used for this purpose in the coating industry. It is a dispersible material that is capable of bonding the membrane to corrosive substrates.In general, the binders fall into four groups: (1) yl-?lyamide 9;
(2) a diglycidyl ether of bisphenol A and a vegetable oil fatty acid; (3) air-drying binders such as those derived by reaction with;
Solvents that solidify by evaporation of solvents such as polyhibiloxyether (phenoxy PKHH) to bisphenol derived from bisphenol A and epichlorohydrin -
a soluble binder; and (4) a binder commonly used in moisture curing systems such as silicic acid tetraethyl esters, silicic acid alkyl esters made by hydrolysis or polymerization of alcohols and glycols; will be chosen. Other suitable binders include silicic acid esters of polyols such as those described in US Pat. No. 4,086.096, chlorinated rubbers made by chlorinating natural rubber in solution, and the like. Among the binders, epoxy resins and alkyl silicates are preferred, with epoxy resins being particularly preferred.

The liquid organic vehicle contains a mixture of at least two ether alcohols. Preferably, the mixture has a weight ratio of one ether alcohol to the other ether alcohol of less than about 10:1, preferably less than about 5:1, more preferably less than about 2.5:1, and most preferably contains both ether alcohols in a ratio of less than about 1.5:1. Preferably, the first ether alcohol has the formula R-○-R1-OH and the second ether alcohol has the formula R2-○-R3-OH, where (1) R and R2 are independently Then C1-(1
6 alkyl, and (2) R' and R3 are independently alkylene having at least 3 carbon atoms;
However, the first ether alcohol and the second ether alcohol are different. More preferably R1 and R independently contain more than 2 carbon atoms. Preferably R1 and R3 independently contain less than 6 carbon atoms, more preferably less than 5 carbon atoms, even more preferably less than 4 carbon atoms. Most preferably R1
and R3 each have 3 carbon atoms. Accordingly, the zinc-containing coating formulation is characterized in that (1) R' and R3 are independently C
2-(16 alkylene, and (2) R and R are independently CI-(16 alkyl), and it is particularly preferred to use mixtures of alcohols which differ by at least two carbon atoms. In a suitable mixture,
R1 and R3 are 1,2-propylene. In more preferred mixtures, R and R2 differ by at least 2 carbon atoms, such as when R has 3 carbon atoms and R2 has 1 carbon atom. It is something.

In the most preferred mixture R is n-propyl and R2
is methyl.

Propylene glycol n-propyl ether (PGNP)
Especially preferred are mixtures of E) about 2.5 to 1 parts by weight of propylene glycol methyl ether (PGME) and about 1 to 2.5 parts by weight. PGNPE and PGME are each 2
PGME exists as 1-methoxy-2-propanol and 2-methoxy-1-propanol and PGNPE as 1-(n-propoxy)-2-propanol and 2-(n-propoxy)- Exists as 1-propanol. The upper limit of the weight ratio of PGNPE isomers is preferably 1-(n-propoxy)
-2-pronominol vs. 2-(n-propoxy)-x-
Pronominol is less than 20:1, more preferably less than 10:1, most preferably less than 4:1. 1-(n-propoxy)-2-propanol vs. 2-(
The lower limit of the PGNPE isomer weight ratio of n-propoxy)-1-propanol is preferably greater than 1:1, more preferably greater than 2:1 (and most preferably about 5.7:
It is 1. PGME can be just one 1-methoxy-2-propanol.

PGM of 1-methoxy-2-propanol versus 2-methoxy-1-pronoξol when both isomers are present
The E isomer weight ratio is preferably less than about 40=1, more preferably less than about 25:1, and in particularly preferred embodiments the ratio is less than 22:1. The lower limit of the PGME isomer weight ratio is preferably greater than 1:1, 10:1
Larger ratios are more preferred, with a ratio of 19:1 being optimal.

In addition to the required ingredients described above, the zinc-containing paints of the present invention may optionally contain other ingredients commonly used in conventional zinc-containing paints, such as titanium dioxide, talc, and clays (e.g., kaolin). Pigment; US Patent No. 40
Inhibiting auxiliary pigments as described in No. 86096; MonastralGreen
Colored pigments or dyes such as; reinforcing pigments; extender pigments; thixotropic agents; anti-flow agents such as pyrogenic silica, bentonite, montmorillonite; cathodes such as magnesium powder, aluminum powder, ferrous sulfite. may include a sexually active metal; etc. Furthermore, dispersants and stabilizers;
a coating enhancer such as Dow Corning India Additive No. 21 (Dow Corning Paint, Mid-8th Rand, MI 48640), which is a 5% amine-functional silicone monomer in n-butanol;
and Molecular Sheep and the above-mentioned Dow Corning
Moisture absorbers such as paint additive number 21 may also be used.

The zinc-containing paints of the present invention are made by mixing the ingredients described above using methods similar to those used in making conventional zinc-containing paint formulations. Such methods will be explained in detail in the Examples.

In order to demonstrate the reaction that occurs between the zinc-containing particulate solid of the present invention and a liquid organic vehicle, a large number of zinc pieces were immersed in various liquid organic solvent mixtures, their surfaces were dried, and then analyzed by X-ray photoelectron spectroscopy. analyzed.

The results show a change in surface composition based on the liquid organic solvent used. The method will be described and the results will be discussed in detail below.

A 0.5 mm thick, 99.99% pure by weight zinc ingot is cut into four slices using a Diamond 9 wheel and polished flat with 600 grit aluminum oxide. Wash this flat slice with methylene chloride and −
Let it dry naturally for a day.

The four dried slices are each subjected to different treatments prior to analysis. The first slice is a control and is exposed to air for 72 hours. The second slice is PcME(1−′, lh
xy-2-propanol (weight ratio of 2-methoxy-1-propanol to 2-methoxy-1-propanol is 19:1) for 72 hours. The third slice is PGNPE (1-(n-propoxy)-2-propanol vs. 2-(n-propoxy)-1
- the weight ratio of propanol is 5.7:1).
Soak for an hour. The fourth slice is PGNPE vs. PGME
(PC, ME and PGN) in a weight ratio of 1:15.
The respective isomer ratios of PE are the same as those used in slices 2 and 3) for 72 hours.

This fourth slice is the only slice immersed in the liquid organic vehicle of the invention. Immersion is carried out in a closed glass container.

After processing these slices for 72 hours, they are fixed in a stainless steel holder and analyzed as follows.

This holder is placed in an X-ray photoelectron spectrometer. After that, the inside of the X-ray photoelectron spectrometer was kept under high vacuum (
1o-9 to 10-10 Torr). The slices are left in the X-ray photoelectron spectrometer for drying.

The X1 photoelectron spectrometer includes a tungsten-iridium filament that emits thermionic electrons when heated. These thermionic electrons are accelerated to a water-cooled magnesium anode by an accelerating voltage of 15,000 volts. When accelerated thermionic electrons collide with the magnesium anode, KaX-rays are generated, and these X-rays are 1253.6
It has an energy of electron volts. These X-rays pass through a 2 micron aluminum window and impinge on the slice to be analyzed. This collision generates photoelectrons from the slice. These photoelectrons pass through a deceleration screen, are screened by a double θvass cylindrical mirror filter, and are detected by a photomultiplier tube.

Energy of colliding X-rays (1253.6 electron volts)
When the kinetic energy of the photoelectron is subtracted from , the binding energy of the photoelectron remains. From the distribution of photoelectron binding energy,
Atoms other than hydrogen atoms on the surface can be detected and quantified. This method measures atoms from the surface to approximately 50λ below the surface.

Analysis of four slices detected zinc, oxygen, carbon and chlorine. The atomic concentrations of the detected elements are shown in Table ■.

Table I Zinc Oxygen Carbon Chlorine Total Slice 1 (Air') 20,5 45.5 31
．． 0 3.0 100.0 slice 2 (PGME)
18,9 39.4 39.0 2.7
100.0 slice 3 (PGNPE) 9.2
31.8 58.1 0.9 100. (
l slice 4 (mixture) 26,8 39.6 30
．． 6 3.0 100.0 The percentage of zinc detected in the analysis of the four slices is different. Only slice 4 (using the liquid organic vehicle of the invention) showed an increase in the detected amount of surface zinc relative to slice 1 (control).

Assuming that slice 4 has a result for surface zinc equal to the weighted arithmetic mean of the results of slices 2 and 3, the predicted value for slice 40 surface zinc is 13.1 atoms. This predicted value is only 49 times the measured value.

Another analysis of the data in Table I shows that treatment of the zinc slice with PGME (slice 2) reduces detected surface zinc by 7-8%. On the other hand, treatment of the zinc slice with PGNPE (slice 3) reduces the detected surface zinc by 55.1%.

Again, slice 4 (using the liquid organic vehicle of the invention)
has a result for surface zinc equal to the weighted arithmetic mean of the results for slices 2 and 3, the predicted value for surface zinc for slice 4 is 13.1 atoms. This predicted value is also only 49 times the measured value.

Zinc 2 and Auger peak
) analysis shows that all of the detected surface zinc is in the form of zinc oxide. When the oxygen contained in zinc oxide is subtracted, residual surface oxygen remains. The standardized atomic ratios of surface elements other than zinc oxide are shown in Table H.

Table ■ Residual oxygen Carbon Chlorine Total (atomic %) (atomic %) (atomic %) (atomic %) slice l (air) 42.4 52.5
5.1 100.0 slice 2 (PGME)
33.0 62.7 4.3 1
00.0 Slice 3 (PGNPE) 27.7
71.2 1.1 100.0 slice 4 (mixture) 27.6 65.9 6
．． 5 100.0 Assuming that slice 4 (using the liquid organic vehicle of the present invention) has a result for surface residual oxygen equal to the weighted arithmetic mean of the results of slice 2 and slice 3, the predicted value of residual oxygen for slice 4 is 29
．． It becomes 8 atoms. This predicted value is within 8 inches of the calculated value based on measurements of 4 slices.

These measured and calculated values indicate that a significant reaction occurred between the liquid organic vehicle of the present invention and the surface of the zinc slices. This reaction is PGME (slice 2)
Or it does not occur if PGNPE (slice 3) is used separately as a solvent or if no solvent is used at all (slice 1).

This reaction produces more surface zinc oxide than when no solvent is used or when a solvent is used that is not the liquid organic vehicle of the present invention.

This increase in surface zinc oxide increases the corrosion resistance of the zinc-containing paints of the invention relative to the corrosion resistance of zinc-containing paints not according to the invention.

To confirm the purity of zinc as measured by an X-ray photoelectron spectrometer, slice 1 (air) is subjected to argon sputtering to remove up to 100 A from the surface of the zinc. Only zinc was detected on the newly created surface by X-ray photoelectron spectroscopy, confirming that the zinc ingot used was of sufficient purity to not affect the measured surface concentration.

Therefore, as is clear from the above data, a reaction occurs between the zinc-containing particulate solids and the liquid organic vehicle in the zinc coating formulations of the present invention.

The present invention also provides a method of making a zinc-containing paint, the method comprising: (a) an amount of zinc-containing particulate solids sufficient to enhance the corrosion protection of the paint; and (b) fractionating the zinc-containing particulate solids. a liquid organic vehicle in an amount sufficient to give the formula R
-0-R'-OH (wherein R+!furkyl and R1 is alkylene), a primary ether alcohol; and (2) 2R2-0-R''-OH (wherein R2 is alkyl and R3 is an alkylene), the first ether alcohol and the second ether alcohol are different, wherein the mixture contains one of the two ether alcohols. It is characterized by containing a sufficient proportion of the above-mentioned first and second ether alcohols to improve the corrosion resistance of the paint compared to paints used as solvents.

The method also includes adding a binder in an amount sufficient to bond the paint to a corrosive substrate when the paint is applied to the substrate for corrosion protection purposes.

The zinc-containing particulate solid is used in the coating formulation in an amount sufficient to provide the desired initial corrosion protection or corrosion resistance. Preferably, the amount is from about 50 to about 9% by weight of the formulation.
and most preferably from about 70% to about 9% by weight. The binder is used in an amount sufficient to effectively bond the zinc-containing particulate solid to the corrosive substrate. Preferably, the amount of binder is from about 2 to about 1% by weight of the formulation, most preferably from about 4 to about 7%. The liquid organic vehicle is used in an amount that provides adequate fluidity so that the formulation can be applied to the desired substrate. Preferably, the vehicle comprises about 5% to about 15% by weight of the formulation, most preferably about 9% to about 1% by weight of the formulation.
An amount of 1% by weight is used.

Substrates suitably coated by the practice of this invention include all materials susceptible to corrosion, such as steel, including galvanized steel, copper, magnesium, and other corrosive metals.

Steel substrates are particularly suitable for use in the practice of this invention.

The zinc-containing coating formulations of the present invention may be applied to corrosive substrates without pretreatment of the substrate, although the substrate may be sandblasted, shotblasted or waternolasted prior to application. preferable. It can also be applied to cold rolled steel and pickled metal surfaces.

More preferably, however, the corrosive substrate is sand plasting, most preferably low profile Santo 9 plasting using fresh sand.
and-blasting).

Low profile Santo 9 plasting is approximately 127 x 1O
- yields a roughened surface of 2TR; - blade height profile or full profile Santo 9 plasting yields a roughened surface of approximately 3.81 x 10-2+ on. The zinc-containing coating formulation is applied to the substrate by conventional methods such as dipping, air or airless spraying, brushing, and rolling. The formulation is of sufficient thickness, preferably about 6.4X, to significantly prevent corrosion of the coated substrate.
The coating is applied to a thickness of between 10-3 and about 410 x 10-3, most preferably between about 13 x 10-3 and about 280 x 10-3. Preferably, the coating is thicker than the substrate profile.

The paint is then dried under conditions sufficient to remove the liquid organic vehicle and cure the binder.

Drying conditions will vary depending on the binder used, but generally the coated substrate is dried at an air width of about -20°C to about 50°C.
Most preferably, it is desirable to dry at a temperature of about 0°C to about 30°C.

The use of the zinc-containing paints of the present invention provides different results than conventional zinc-containing paints on the market. It was applied to two steel substrates. One used a commercially available zinc-containing paint and the other used a zinc-containing paint of the invention.

When both coated substrates are measured with a scanning electron microscope and an It was found to have fewer large particles on the membrane surface. Similarly, the interparticle spaces had statistically different elemental analyses. These results demonstrate that chemical differences exist between the zinc-containing paints of the prior art and the zinc-containing paints of the present invention.

The following examples are intended to further illustrate the practice of the invention and are not to be considered as limiting its scope.

All parts and percentages are by weight unless otherwise specified.

When measuring the corrosion resistance of the coated substrate, the corrosion resistance of the paint was measured by the following method. 7-Car Chemical Company (Hook
Bonderite 1000 cold-rolled steel specimens obtained from Er Chemical were sandblasted with low-profile sandblasting, washed with acetone, and exposed to 24±2°C (75±3”F) and 50°C relative One of the two mixed paints was sprayed vertically at humidity.The spray test piece was held horizontally at 24±2℃ (7℃).
5±37) and 50±5 degrees relative humidity. This dried coated test piece was 35% of the unprotected test piece.
Salt spray test chamber (Salt F) at ±5°C (95±87)
ogCabinet: ASTM B-117-
73) ASTM D-1654
- Evaluate according to 79.

Example 1 Zinc-Otsuk 3, a zinc-containing three-component organozinc primer
PGNPE and PG in the batch of 08 (ZINC-LOCK; Porter: 7-Teings Company's trademark)
A 1.5 weight ratio mixture of ME was formulated. paint mix (
1321') was mixed with 59.8 g of liquid organic vehicle. 1-methoxy-2-propanol vs. 2-methoxy-1
The PGME isomer ratio of -propanol was 19:1. 1-(n-propoxy)-2-propanol vs. 2-
PGNP of (n-propoxy)-1-7' lovanol
The E isomer ratio was 5.7:1.

Zinc Lock 308 Planned Primer 2nd batch commonly used ethylene glycol ethyl ether (EGEE)
(This is a comparative sample that is not an example of the present invention).

Bombillai obtained from Tsuka Chemical Company) 100
0 Low Profile Sant 9 on Individual Specimens of Cold Rolled Steel
Plasting was applied, washed with acetone, and vertically sprayed with one of the two formulations described above at 23±2°C (75±37) and 50±5 relative humidity. Paint: Graco 800 type air spray gun, 7
Use o4 or 78 air cap, DeVilbiss (De
vilbis) was sprayed through the E-tip. The vessel pressure was 5-10 psig and the 1-Fort vessel was placed at the level of the specimen. ”! Place the misted test piece horizontally.
Three cells were dried at 2° C. (75±37) and 50 cells were dried at 5% relative humidity.

The coated test pieces were subjected to a comparative test for adhesion (
ASTM 3359-78-B, etc.). Both experimental and control pieces showed similar results. The coated test piece is 35cm5
Albert Singleton Corrosion Test (ASTM B-1) in a Salt Spray Test Chamber for - Weeks at (95 ± 87) °C
17-73) and then ASTM D-1654-7
Evaluation was made according to 9. The results are ASTM D-1
7 points of improvement were shown for the 10 point evaluation of 654-79. In addition, the test piece was tested using a weather-o-meter test (ASTM).
G-53-77) for 28 days and ASTM D
-1654-79.

Weather-O-meter testing was conducted as follows: (1) 25 minute condensing cooling cycle, input adjustment set to "high power" and thermostat adjustment set to 4; (2) UV-edge cycle input adjustment set to "high". and the thermostatic adjustment is 4.5; and (3) the cycle time is 8 hours of UV light to 4 hours of condensing cooling.

The results are ASTM D-1654-7 with a 10-point rating.
It showed 6 points of improvement compared to 9.

Example 2 Example 1 was repeated by varying the amount of PGNPE to PGME. Table ■ Niss Albert Singleton corrosion test results are shown for PGNPE and P
The mixtures of GME have been shown to have improved corrosion resistance when compared to coatings using solvents consisting of either alkane ether alcohol solvent alone. 1
It should be noted that a higher score indicates better corrosion protection relative to a 0 score rating.

Table ■ 0 o.

The isomer ratio was the same as in Example 1.

EXAMPLE 3 Example 1 using a fully sandblasted angle iron substrate under environmental conditions that produced a 2.2 mil coating.
repeated. Salt spray, laboratory (ASTM B-11
7-73) (600 hour exposure) results were similar, but showed only a 2 point improvement over the 10 point rating ASTM D-1654-79.

Example 4 Example 3 was repeated using inch hot rolled steel substrates. The coating thickness was 3.8 mils (0,096 mm). Salt spray test chamber (ASTM B-117-73
) (1780 hour exposure) results were similar, showing a 5 point improvement over the 10 point rating ASTM D-1654-79.

Example 5゜9th methyl isobutyl ketone, 16th xylene, 7
5% bisphenol A epoxy resin (average molecular weight 10
50. Epoxy resin 149.9,9. Beetle 216-8
le; trade name of American Cyanamid Company) 9.4 g, xylene 60.6 g, EGEE
95.5I, humid silica (0.02 micron)
25.4F, Epon 7V-15-X-70 (Epon; trademark name of Seal Chemiriki/Iz Company) 72.
7! i, methylimbutylke): /71.1F and zinc dust (ASTM 5pec, D-520゜ type) 2
Example 1 Using a coating formulation containing 372.0 g
repeated. EGEE was replaced with an alcohol mixture of the invention. Salt spray test chamber (ASTM B-11,
7-73) (696 hours exposure) result is 10 points A
Six improvements were made over STM D-1654-79.

Example 6° Example 3 was repeated using the coating formulation of Example 5. Salt spray test chamber (ASTM B-117-73) (
1107 hour exposure) results are ASTM 10 point rating
Six improvements were made over D-1654-79.

Example 7.9 methyl isobutyl keto/, 16% xylene, 7
5% bisphenol A epoxy resin (average molecular weight 10
50. 32.3 g of epoxy resin (epoxide equivalent weight 475-575), 70.6.9 g of nitropropane. Phthalocyanine green 1.8p, MPA2000X (
NL Chemicals trade name) 5.1. Toluene 20.2g
, EGEE 3. i, Versa Bi 140 (Versa
mid; Henkel Corporation trademark name) 36.
4.9. 2.4.6-)Su(dimethylaminemethyl)phenol 1.1.9. Improper tool 23.8g
and zinc dust (ASTM D-520-51) (4~
Example 1 was repeated using a coating formulation containing 100 g (10 microns). EGEE was replaced with an alcohol mixture of the invention. Salt water spray test chamber (ASTMB-
117-73) (820 hour exposure) showed a 5 point improvement over the 10 point rating ASTM I)-1654-79.

These examples demonstrate that the solvent mixtures of the present invention improve the corrosion protection of zinc-containing paints under a variety of conditions.

Claims (1)

[Scope of Claims] 1) (a) Zinc-containing particulate solids in an amount sufficient to enhance the anticorrosive properties of the paint; (b) when the paint is applied to a corrosive substrate for corrosion protection purposes, the paint is applied to a corrosive substrate; a binder in an amount sufficient to bind the zinc-containing particulate solid; and (c) a liquid organic vehicle in an amount sufficient to disperse the zinc-containing particulate solid; i) a first ether alcohol of the formula R-O-R^1-OH, where R is alkyl and R^1 is alkylene; and (ii) a first ether alcohol of the formula R^2-O-R^ a second ether alcohol of 3-OH (wherein R^2 is alkyl and R^3 is alkylene); In comparison to paints that use a solvent that is different from alcohol and in which the mixture consists of one of two types of ether alcohols:
the first of the above in a sufficient proportion to improve the corrosion resistance of the paint.
A zinc-containing paint formulation characterized in that it contains a second and a second ether alcohol. (2) Zinc-containing granular solid has an average particle size of about 100 μm - about 2
Zinc-containing coating formulation according to claim 1, consisting of micron zinc dust. (3) The zinc-containing coating formulation of claim 1, wherein the binder is a reactive binder. (4) The zinc-containing coating formulation of claim 3, wherein the reactive binder is an epoxy resin or an alkyl silicate ester. (5) the mixture has a first ether alcohol ratio of less than about 10:1;
A zinc-containing coating formulation according to claim 1, comprising a second and a second ether alcohol. 6. The mixture comprises the first and second ether alcohols in a ratio of one ether alcohol to the other ether alcohol of less than about 1.5:1. Zinc-containing paint formulations. (7) (i) R^1 and R^3 are independently C_2-C
_6 alkylene, and (ii) R and R^2 are independently C_1-C_6 alkyl and differ by at least two carbon atoms. Zinc-containing paint formulations as described. (8) A zinc-containing coating formulation according to claim 7, wherein R^1 and R^3 each have 3 carbon atoms. (9) A zinc-containing coating formulation according to claim 7, wherein R is n-propyl and R^2 is methyl. (10) The mixture consists essentially of about 2.5 to about 1 part by weight propylene glycol n-propyl ether and about 2.5 to about 1 part by weight propylene glycol methyl ether. Zinc-containing paint formulations as described. (11) Propylene glycol n-propyl ether consists essentially of 1-(n-propoxy)-2-propanol and 2-(n-propoxy)-1-propanol in a weight ratio of about 20:1 to about 1:1. The propylene glycol methyl ether consists essentially of 1-methoxy-2-propanol and 2-methoxy-2-propanol in a weight ratio of about 25:1 to about 1:1.
A zinc-containing coating formulation according to claim 10, comprising 1-propanol. (12) The weight ratio of 1-(n-propoxy)-2-propanol to 2-(n-propoxy)-1-propanol is about 4:1 to about 2:1, and the weight ratio of 1-methoxy-2-propanol to 12. The zinc-containing coating formulation of claim 11, wherein the weight ratio of 2-methoxy-1-propanol is about 22:1 to 19:1. (13) (a) from about 50 to about 90% by weight of a zinc-containing particulate solid; (b) from about 4 to about 7% by weight of a binder; and (c) from about 5 to about 15% by weight of a liquid organic vehicle; A zinc-containing coating formulation according to claim 1 containing. (14) A film formed by applying the zinc-containing coating composition according to claim 1 to a corrosive substrate and drying or curing the coated substrate. (15) A corrosive substrate coated with the zinc-containing coating formulation according to claim 1. 16. The zinc-containing coating formulation of claim 1, wherein the liquid organic vehicle affects the surface of the zinc. (17) Zinc comprising reacting (a) an amount of a zinc-containing particulate solid sufficient to enhance the corrosion protection of the coating; and (b) a liquid organic vehicle sufficient to disperse the particulate solid. A method for producing a coating material containing a coating material, wherein the vehicle is (i) a first ether alcohol of the formula R-O-R^1-OH (wherein R is alkyl and R^1 is alkylene); , (ii) a second ether alcohol of the formula R^2-O-R^3-OH, where R^2 is alkyl and R^3 is alkylene; The first ether alcohol and the second
ether alcohols and in sufficient proportions to improve the corrosion resistance of the paint as compared to paints that use either of the two ether alcohols as a solvent. The above-mentioned manufacturing method is characterized in that it contains first and second ether alcohols. (18) When applying paint to corrosive substrates for corrosion prevention purposes,
18. The method of claim 17, comprising adding a binder in an amount sufficient to bond the paint to the substrate. (19) The method according to claim 18, wherein the binder is a reactive binder. (20) The method according to claim 19, wherein the reactive binder is an epoxy resin or an alkyl silicate ester. (21) The method of claim 17, wherein the zinc-containing particulate solid comprises zinc dust having an average particle size of about 100 μm to about 2 μm. (22) The liquid organic vehicle is composed of (i) R^1 and R^
3 is independently C_2-C_6 alkylene, (ii
18.) The method of claim 17, wherein R and R^2 are independently C_1-C_6 alkyl and differ by at least two carbon atoms. (23) The liquid organic vehicle comprises about 2.5 to about 1 part by weight of propylene glycol n-propyl ether and about 2.5 to about 1 part by weight of propylene glycol n-propyl ether.
23. The method of claim 22, comprising about 1 part by weight of propylene glycol methyl ether. (24) Propylene glycol n-propyl ether consists essentially of 1-(n-propoxy)-2-propanol and 2-(n-propoxy)-1-propanol in a weight ratio of about 20:1 to about 1:1. and the propylene glycol methyl ether consists essentially of 1-methoxy-2-propanol and 2-methoxy-1-propanol in a weight ratio of about 25:1 to about 1:1.
The method described in section.