JPH06136304A - Slip agent for water-based coating material and its production - Google Patents

Abstract

PURPOSE:To obtain a slip agent for water-based coating material which can decrease the coefficient of friction of coating film to increase its slipperiness and to suppress the occurrence of marks produced by scratching and rubbing by dispersing a hydrophilic wax combined with a hydrophilic solvent in the form of fine particles in water. CONSTITUTION:At least one hydrophilic wax selected from among natural waxes such as shellac wax, sugar wax, beeswax, carnauba wax and montan wax and synthetic waxes such as oxidized paraffin, oxidized microcrystalline wax, oxidized polyethylene and ethylene acryllic wax is dissolved under heating in a hydrophilic solvent selected from among an alcohol, cellosolve and other water-soluble or partially water-soluble volatile solvents. The obtained hot solution is added to a mixed solution comprising a hydrophilic solvent and water to form a primary dispersion. This dispersion is ground into a fine particle dispersion of a maximum particle diameter of 20mum or below.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention reduces the coefficient of friction of a coating film and increases the slip property by adding it to a can coating, a precoat metal coating, a plastic coating, etc. TECHNICAL FIELD The present invention relates to a slip agent for water-based paints capable of suppressing the occurrence of water and a method for producing the slip agent.

[0002]

2. Description of the Related Art In paints for cans, pre-coated metal paints, plastic paints and the like, scratches, scratches and the like are apt to occur during transfer of coated objects due to contact with each other or with a transfer machine. As a method of preventing the occurrence of scratches and scratches, in addition to a method of improving the physical properties such as improving the hardness of the coating resin, it is possible to reduce the friction coefficient of the coating film or increase the slip property. There is also a method of adding a paint additive (slip agent) to the paint. As this coating material, organic solvent dry type epoxy, polyester, acrylic, acrylic melamine, etc. are used as a resin, and as a slip agent, various waxes are generally dissolved by using a suitable solvent, or a hot-melt quenching method. Those which have been made into a uniform dispersion by a mechanical pulverization method have been used.

[0003]

However, the above-mentioned organic solvent drying type paint has a negative effect on the environment due to the discharge of the organic solvent and a risk of fire caused by handling flammable dangerous substances.
Alternatively, there is a tendency to shift to water-based paints in recent years in consideration of the cost burden for combustion treatment of organic waste gas, and naturally, water-based slip agents are also required. However, it is impossible to produce a stable water-based slip agent having a maximum particle diameter of 20 μm or less by the same method as the solvent type slip agent. Further, a production method in which a wax is emulsified into fine particles by an emulsion method is also known, but in this method, a hydrophilic substance such as a surfactant, a dispersion stabilizer and an alkali needs to be used. The water resistance of the resin may be impaired, and the stability and slip property of the coating resin may be impaired. Furthermore, many waxes are soluble in organic solvents such as alcohols, hydrocarbons, esters, and ketones when they are heated, but they are insoluble in water, so they do not get wet even when a strong mechanical or physical dispersion force is applied. Since it was bad, it was not possible to obtain a stable dispersion.

[0004]

The present invention has been proposed in view of the above, and is a natural product such as shellac wax, rice wax, sugar wax, sumac wax, beeswax, carnauba wax, candelilla wax, montan wax, and white wax. Wax, paraffin oxide, microcrystalline oxide wax, polyethylene oxide, Fischer
Hydrophilic waxes (hereinafter referred to as component A) consisting of one or more kinds of synthetic waxes such as Tropsch wax, ethylene acrylic wax, ethylene vinyl acetate wax, etc., are dissolved in alcohol, cellosolve, other water-soluble or partially soluble waxes. It is heated and dissolved in one or more hydrophilic solvents selected from volatile solvents (hereinafter referred to as C component), and this hot solution is added to a mixed solution of the hydrophilic solvent and water to form a primary dispersion. The present invention relates to a slip agent for a water-based paint, which comprises pulverizing the primary dispersion to obtain a fine particle dispersion having a maximum particle diameter of 20 μm or less, and a method for producing the slip agent.

When the hot solution prepared by heating and dissolving the above-mentioned component A in the component C is added little by little to the mixed solution in which the lipophilicity has been increased by adding the component C to water in advance while stirring, the maximum particle diameter becomes several. A 100 μm dispersion is prepared.
By crushing this with a crusher such as a three-roll mill, a ball mill, a sand mill or an attritor, a stable fine particle dispersion having a maximum particle diameter of 20 μm or less can be obtained.

Further, the present invention provides the above-mentioned component A, lanolin, coconut oil, cottonseed oil, soybean oil, rapeseed oil, linseed oil, palm oil and the like, which are liquid at room temperature, fatty acid esters, fats, petrolactam, liquid paraffin, A lipophilic wax (hereinafter referred to as component B), which is a solid at room temperature and composed of one or more selected from non-oxidized paraffin, non-oxidized microcrystalline wax, non-oxidized polyethylene, etc., is dissolved by heating in the component C, A water-based paint characterized in that the solution is added to a mixed solution of a hydrophilic solvent and water to form a primary dispersion, and the primary dispersion is pulverized to obtain a fine particle dispersion having a maximum particle size of 20 μm or less. A slip agent for use and a method for producing the same are also proposed.

When the hot solution prepared by heating and dissolving the above-mentioned A component and B component in the C component is added little by little to the mixed solution whose lipophilicity has been increased by adding the C component in advance while stirring, A primary dispersion in which coarse particles mixed with the B component are dispersed is prepared. By crushing this with an appropriate crusher as described above, the maximum particle size is 20 μm.
The following stable dispersion can be obtained. That is, the component B alone cannot form a stable aqueous dispersion, but according to the present invention described above, a stable fine particle dispersion can be obtained in a state where the component A is mixed in one particle.

[0008]

EXAMPLES Examples of the present invention will be shown below.

Example 1; 240 g of carnauba wax No. 1 (manufactured by Yoko Kato) and 400 g of isopropyl alcohol (IPA) were placed in a 500 ml beaker and heated at 80 ° C. to prepare a uniform hot solution. Then chilled with ice 20
The hot solution was slowly added little by little to a stirred solution of a mixed solution of 80 g of IPA and 880 g of water in a 00 ml beaker. Here, a primary dispersion liquid having an average particle diameter of about 100 μm was obtained. When this was put in a 10-liter experimental ball mill together with magnetic balls and pulverized for 50 hours, a stable fine particle dispersion having a maximum particle diameter of 5 μm could be obtained.

Example 2 In a 500 ml beaker, 160 g of rice wax SS (manufactured by Bosso Yushi), 80 g of microcrystalline wax Hi-Mic 1080 (manufactured by Nippon Seiro Co., Ltd.), and 400 g of IPA were put and heated to 80 ° C. to homogenize. A hot solution was made. Next, chilled with ice 2
The hot solution was slowly added little by little to a stirred solution of a mixed solution of 80 g of IPA and 880 g of water in a 00 ml beaker. Here, a primary dispersion having an average particle diameter of about 100 μm was obtained. This primary dispersion caused a rapid precipitation of the wax content when left to stand. When this was pulverized three times with a triple roll, a maximum dispersion of 5 μm was obtained. This dispersion was a stable fine particle dispersion in which changes such as coagulation and sedimentation were not confirmed even when left at room temperature for 3 months or more.

Example 3 The same operation was performed except that lanolin ODL (made by Croda Japan) was used in place of the microcrystalline wax in Example 2 above, and a fine particle dispersion of maximum 5 μm was obtained. It was

Example 4; 160 g of oxidized polyethylene wax AC-629 (made by Allied Chemicals) and 80 g of HNP-11 (made by Nippon Seiro Co., Ltd.) in a 500 ml beaker.
And 400 g of butyl cellosolve were added and heated to 80 ° C. to form a uniform solution. Next, chilled with ice 2
Butyl cellosolve 80 g and water 88 in a 00 ml beaker
The hot solution was slowly added little by little to a mixture of 0 g and the mixture while stirring. Here, the average particle size is 100
A primary dispersion of about μm was obtained. This one
Enclose with 0l experimental ball mill magnetic ball,
When dispersed for a period of time, it was possible to obtain a dispersion in which the wax component having a maximum particle size of 60 μm was easily precipitated. When this was further rotated in a ball mill for 30 hours, a stable fine particle dispersion having a maximum particle diameter of 5 μm could be obtained.

Example 5: 240 g of carnauba wax No. 1 (described above) and 400 g of IPA were placed in a 500 ml beaker and heated at 80 ° C. to prepare a uniform hot solution. Next, the above hot solution was added little by little to a mixed solution of 320 g of IPA and 720 g of water cooled to 5 ° C. in a 2000 ml beaker while stirring. Here, the maximum particle size is 20
Since a primary dispersion of 0 μm was obtained, this was enclosed in a 10-liter experimental ball mill together with magnetic balls,
When dispersed for 50 hours, a stable fine particle dispersion having a maximum particle size of 5 μm could be obtained.

Comparative Example 1 A 0.1 liter experimental ball mill was charged with 0.1 kg of lanolin ODL (previously mentioned), 0.4 kg of carnauba wax No. 1 (previously described), 0.5 kg of IPA and 1 kg of water, and a predetermined amount of magnetic balls was added. After enclosing and rotating for 50 hours, lanolin and carnauba wax adhered to the side surface of the vessel and balls and were not dispersed at all.

Comparative Example 2; Microcrystalline wax Hi-Mic 1080 (supra) in a 200 ml beaker.
Heat 30 g to 50 g IPA at 80 ° C. to make a uniform hot melt. This hot solution was slowly added to a stirred mixture of 10 g of IPA and 110 g of water in a 500 ml beaker cooled with ice to prepare a primary dispersion. This is a coarse particle having a maximum particle diameter of several mm, and a precipitate was rapidly formed when left standing. 2 kg of this
It was prepared and dispersed in a 10 liter laboratory ball mill for 50 hours, leaving wax particles of a few hundred μm remaining.

Examples 6 to 31, Comparative Examples 3 to 16; 500
In a beaker of ml, the components A and B having the composition ratios shown in Table 1 and Table 2 were heated and dissolved in the component C (heated portion). A mixed solution of C component (cooling component) and water in a 2000 ml beaker cooled with ice was slowly added little by little to the stirred solution. This is 1 at the weight percentage of Table 1.
600 g was prepared and used as the primary dispersion. This was enclosed in a 10-liter experimental ball mill together with magnetic balls, and 5
Disperse for 0 hours. The obtained fine particle dispersion was observed with an optical microscope, and the maximum particle diameters are also shown in Tables 1 and 2 as a result.

[0017]

[Table 1]

[0018]

[Table 2]

[Slip test] Examples 4, 5 above
Water-soluble paint WA924 (manufactured by Mitsui Toatsu) 1 part with 1.5 parts of fine particle dispersion of 6,7,11,24,25,27
After adding to 100 parts and stirring and mixing thoroughly, the coating thickness is 10μ
It is applied to a tin plate so that it will be m, and baking conditions 160 ° C ×
A test material was prepared by baking in 10 minutes. When the dynamic friction coefficient was measured with a friction coefficient measuring machine AN (manufactured by Toyo Seiki Seisakusho), the results shown in Table 3 were obtained. In addition, as a blank, the one without addition of the fine particle dispersion was also measured in the same manner, and is also shown in Table 3.

[0020]

[Table 3]

[0021]

As described above, the method for producing a slip agent for a water-based paint of the present invention can extremely easily produce a product without using a special device or a special method.

Then, the obtained product is added to, for example, a can paint, a precoat metal paint, a plastic paint or the like to reduce the friction coefficient of the paint film or to increase the slip property so as to scratch or scratch. Can be suppressed.

Claims (4)

[Claims] 1. Natural wax such as shellac wax, rice wax, sugar wax, sumac wax, beeswax, carnauba wax, candelilla wax, montan wax, white wax, oxidized paraffin, oxidized microcrystalline wax, oxidized polyethylene, and fisher wax.
Hydrophilic wax consisting of one or more selected from synthetic waxes such as Tropsch wax, ethylene acrylic wax, ethylene vinyl acetate wax, etc., selected from alcohol, cellosolve, other water-soluble and partially soluble volatile solvents A slip agent for water-based paints, which is a fine particle dispersion in which fine particles having a maximum particle diameter of 20 μm or less are dispersed in water together with the above hydrophilic solvent. 2. Natural wax such as shellac wax, rice wax, sugar wax, sumac wax, beeswax, carnauba wax, candelilla wax, montan wax, and white wax, oxidized paraffin, oxidized microcrystalline wax, oxidized polyethylene, and fisher wax.
Hydrophilic wax consisting of one or more selected from synthetic waxes such as Tropsch wax, ethylene acrylic wax, ethylene vinyl acetate wax, etc., selected from alcohol, cellosolve, other water-soluble and partially soluble volatile solvents The above-mentioned hydrophilic solvent is heated and dissolved, and this hot solution is added to a mixed solution of a hydrophilic solvent and water to form a primary dispersion, and the primary dispersion is further pulverized to have a maximum particle diameter of 20 μm or less. A method for producing a slip agent for a water-based paint, which is a fine particle dispersion. 3. Natural wax such as shellac wax, rice wax, sugar wax, sumac wax, beeswax, carnauba wax, candelilla wax, montan wax, white wax, oxidized paraffin, oxidized microcrystalline wax, polyethylene oxide, Fischer
Hydrophilic wax consisting of one or more kinds selected from synthetic waxes such as Tropsch wax, ethylene acrylic wax, ethylene vinyl acetate wax, and normal temperature of lanolin, coconut oil, cottonseed oil, soybean oil, rapeseed oil, linseed oil, palm oil, etc. In the liquid fatty acid ester, oil and fat, petrolactam, liquid paraffin, non-oxidized paraffin that is solid at room temperature, non-oxidized microcrystalline wax, lipophilic waxes consisting of one or more selected from non-oxidized polyethylene, alcohol, A water-based paint characterized by being a fine particle dispersion in which fine particles having a maximum particle size of 20 μm or less are dispersed in water together with one or more hydrophilic solvents selected from cellosolve and other water-soluble and partially soluble volatile solvents. Slip agent. 4. Natural wax such as shellac wax, rice wax, sugar wax, sumac wax, beeswax, carnauba wax, candelilla wax, montan wax, and white wax, oxidized paraffin, oxidized microcrystalline wax, polyethylene oxide, Fischer
Hydrophilic wax consisting of one or more kinds selected from synthetic waxes such as Tropsch wax, ethylene acrylic wax, ethylene vinyl acetate wax, and normal temperature of lanolin, coconut oil, cottonseed oil, soybean oil, rapeseed oil, linseed oil, palm oil, etc. In the liquid fatty acid ester, fats and oils, petrolactam, liquid paraffin, non-oxidized paraffin that is solid at normal temperature, non-oxidized microcrystalline wax, lipophilic wax consisting of one or more selected from non-oxidized polyethylene, alcohol, Cellulose and other water-soluble or partially soluble volatile solvents are heated and dissolved in one or more hydrophilic solvents, and the hot solution is added to a mixed solution of the hydrophilic solvent and water to prepare the primary dispersion. John is made and this primary dispersion is crushed to obtain a maximum particle size of 2 Method of manufacturing an aqueous coating slip agent, characterized in that the following microparticle dispersion [mu] m.