JPH048105B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for producing an aqueous dispersion of higher fatty acid metal salts. More specifically, the higher fatty acid is characterized by reacting the higher fatty acid with a group metal compound in water in the presence of a nonionic surfactant, and then adding at least one type of glycol to the process of wet dispersion and forced dispersion. The present invention relates to a method for producing an aqueous dispersion of a metal salt. Hitherto, higher fatty acid metal salts have been used in the form of powder or aqueous dispersion in coated papers for the purpose of preventing flowering and dusting and stabilizing the viscosity of color coating liquids. On the other hand, it is also used as a water-resistant agent for various building materials, such as gypsum products, cement products, cement boards, silicon boards, PC boards, particle boards, etc. The fatty acid metal salts used in these various applications are obtained by metathesis or direct reaction at high temperatures. Therefore, the production of aqueous dispersions requires a large amount of surfactant and has various drawbacks. The inventors of the present invention have conducted extensive research to improve these drawbacks, and have arrived at the present invention, which they would like to provide here. The present invention comprises: (a) reacting a higher fatty acid with a group metal compound in water in the presence of a nonionic surfactant; (b) mechanically wet-dispersing the obtained higher fatty acid metal salt; and (c) If necessary, add an anionic surfactant, and (d) before the reaction in (a), before or after dispersion in (b), or
At some point after the addition of (c), at least one glycol is added, and (e) the metal salt is forcibly dispersed using a media disperser, roll mill or piston type high pressure emulsifier, or a combination thereof. This is a method for producing an aqueous dispersion of a higher fatty acid metal salt. The fatty acid metal salt used in the present invention does not contain a free carboxyl group, and therefore the metal compound used in the reaction is used in an amount equal to or more than the equivalent molar amount to the fatty acid. The higher fatty acids used in the present invention are saturated or unsaturated fatty acids, such as one or more fatty acids selected from the group consisting of caproic acid, caprylic acid, lauric acid, myristic acid, palmitic acid, stearic acid, and oleic acid. As a metal compound, MO, M(ON) ₂ or MCl ₂
etc., where M is an alkaline earth metal such as Mg, Ca or Ba, and a metal of the periodic table group such as Zn. Next, nonionic surfactants include nonylphenol, octylphenol, styrenated phenols, polyoxyethylene ethers or polyoxypropylene ethers such as saturated and unsaturated higher alcohols, or polyoxyethylene/propylene ethers. It can be used alone or in combination of two or more. In addition, as anionic surfactants, sulfosuccinic acid salts (K, Na,
NH ₄ ) or sulfonate salts of polyoxyethylene adducts thereof. On the other hand, as the glycol, one or more types are selected from the group consisting of ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, polyethylene glycol, and the like. The dispersing machine used in the present invention includes a roll mill,
Ball mills, media type dispersion machines, disper mills, colloid mills, various mixers, and piston type high-pressure emulsifiers are listed. Details will be explained below using examples, but the scope is not limited to this. Example 1 451.1 g of warm water, 59.4 g of slaked lime, and nonionic surfactants (polyoxyethylene ethyl ether,
Pour 10 g of EO addition (14 moles) into a reaction vessel, heat the system to 85°C, and add stearic acid while stirring.
449.5g was added to carry out the reaction. After the reaction is completed, disperse using a colloid mill and add diethylene glycol.
After adding 20 g of anionic surfactant (sodium sulfonate of polyoxyethylene nonylphenol) and further adding 10 g of anionic surfactant, the mixture was processed in a ball mill for 1 hour to obtain a product with a solid content of 50%. Example 2 570 g of warm water, 61.5 g of magnesium chloride, and 16 g of nonionic surfactant (polyoxyethylene tristyrenated phenyl ether, 7 moles of EO added)
was charged into a reaction vessel and heated to 90°C, and then 353.6 g of steering acid was gradually added while stirring to carry out a reaction. After the reaction, polyethylene glycol (
After adding 30g of W=2000 and dispersing it using a colloid mill, the temperature in the system was cooled to 60℃, and then 16g of anionic surfactant (tristyrenated phenol ethoxysulfate Na salt) was added. After that, further dispersion was performed using a media type dispersion machine to obtain an aqueous dispersion of fatty acid metal salt with a solid content of 50%. Example 3 582.2 g of warm water, 36.7 g of slaked lime, 12.11 g of magnesium chloride, 18 g of nonionic surfactant (15 moles of polyoxyethylene stearyl ether E.O.)
After adding 15 g of dipropylene glycol and heating the system to 90° C., 340.3 g of steering acid was gradually added while stirring to carry out a reaction. After the reaction was completed, the mixture was dispersed using a TK mixer, and then rapidly cooled by passing it twice at a pressure of 300 kg/cm ³ using a piston-type high-pressure emulsifier to obtain an aqueous dispersion of fatty acid metal salts with a solid content of 40%. Comparative Example 1 Example 1 was repeated except that no diethylene glycol was added. This resulted in a product with a solids content of 50%. Performance test results 4-1 Effect as a lubricant for color coating Paint adjustment Kaolin 70 parts Calcium bicarbonate 30 parts Dispersant 0.1 part Casein 7.0 parts Aqueous ammonia 1.2 parts Latex (solid content) 16.0 parts (A) Lubricant: Add 1.0% water (solid content equivalent) to (A) to adjust the total solid content to 43% Stirrer: Use Keday Mill Color coating conditions Base paper: White paperboard (315 g/m ² ) Coating amount: 15 g/m ² ) Coating method: Bar coater Drying method: Air dry then drum dryer at 110℃
−30″ Determines the viscosity change of color coating liquid over time and the state of dirt on the drum dryer.

[Table] Treated for 10 minutes under a weight of 10 kg, filtered through a 150-mesh wire mesh, and determined the amount of residue (relative to product). Numerical value (%)
The smaller the value, the better the condition. The effects of the present invention are as follows. By adding glycols, the viscosity of the color liquid is stabilized, the mechanical stability of the product is improved, and the smoothness of the coated paper is improved.

Claims (1)

[Claims] 1 (a) reacting a higher fatty acid with a group metal compound in water in the presence of a nonionic surfactant; (b) mechanically wet-dispersing the obtained higher fatty acid metal salt; (c) Add at least one glycol before the reaction in (a), before or after the dispersion in (b); (d) in a media-type dispersion machine, roll mill or piston-type high-pressure emulsifier, or A method for producing an aqueous dispersion of a higher fatty acid metal salt obtained by combining the above methods and forcibly dispersing the metal salt.