JP2003155428A - Drying agent for printing ink - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a drying agent for a printing ink that is composed mainly of a solution of a cobalt soap, where the agent has enhanced compatibility with a printing ink by mixing it into the printing ink and therefore is excellent in workability and which has stability when stored. SOLUTION: The drying agent for the printing ink comprises a cobalt octylate solution prepared by adding an 8-10C organic carboxylic acid to a cobalt octylate and adjusting the cobalt octylate solution in which the content of cobalt as a metal attains 10-14% such that its viscosity at 30 deg.C amounts to 20-500 poise.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a desiccant for printing ink comprising a cobalt soap solution, which has a high metal content and a viscosity equivalent to that of the printing ink. The present invention relates to a drying agent for printing ink having the same. [0002] Cobalt soap is used as an ink additive, a paint additive, a catalyst for synthesis, a plastic additive and the like, and exhibits an important function as a drying agent and a curing accelerator. However, cobalt soap having a high content of cobalt metal is in a solid state or has a high viscosity and poor fluidity. It is used with increased fluidity or increased fluidity using solvents such as toluene, xylene, or mineral oil. Furthermore, even if such a solvent is used, when it is difficult to increase the fluidity to a predetermined viscosity, the amount of the solvent may be increased,
Adjustment is made by adding a viscosity reducing agent. The use of these solvents and additives such as viscosity reducing agents is not preferred because it causes the physical properties of the printing ink to change. Also, with the recent spread of environmental problems, it is desired to suppress the use of solvents, especially volatile organic compounds. [0003] The present invention has a high compatibility by being mixed with a printing ink as a drying agent for the printing ink, and therefore has excellent workability and is stable when stored. It is an object of the present invention to obtain a desiccant for printing ink comprising a soluble cobalt soap solution. Means for Solving the Problems An organic carboxylic acid having 8 to 10 carbon atoms is added to cobalt octylate, and a cobalt octylate solution containing 10 to 14% of cobalt metal is heated to 30 ° C. C. A desiccant for printing ink, comprising a solution of cobalt octylate adjusted to a viscosity of 20 to 500 poise in C. DETAILED DESCRIPTION OF THE INVENTION The cobalt soap solution has a carbon number of 8 to 8.
Add 10 organic carboxylic acids. Particularly preferably, by adding octylic acid which is a reaction system drug,
A predetermined viscosity can be controlled without significantly lowering the metal content, and a product that becomes a drying agent for a printing ink with excellent storage stability can be obtained. As a result, the use of an aromatic compound as a solvent can be eliminated. As the aforementioned organic carboxylic acid,
Neodecanoic acid, octylic acid, caprylic acid, capric acid,
Nonanoic acid and secanoic acid. If the number of carbon atoms is 7 or less, the odor is strong and unsuitable. If the number of carbon atoms is 11 or more, it becomes a solid at normal temperature. Next, an example and a comparative example will be described. Example 1 317 g of octylic acid was weighed, placed in a 1 liter separable flask, and stirred with 130 parts of basic cobalt carbonate (cobalt content 45%).
g was added. In order to suppress the sudden generation of carbon dioxide,
The reaction temperature was gradually increased, and when the temperature reached 100 ° C., the increase in the reaction temperature was stopped, and the temperature was maintained for 1 hour while stirring was continued. Subsequently, in order to remove water generated during the reaction, the temperature was raised to 140 ° C., and the temperature was maintained for one hour while stirring was continued. Next, octylic acid 1
13 g was charged and cooled to 70 ° C. to obtain 480 g of a cobalt octylate solution. The cobalt content of the cobalt octylate solution is 12.3% and the viscosity of the solution is 2%.
It was 60 poise. One week later, when the viscosity of the solution was measured, it was 260 poise (30 ° C.), and there was no change. Example 2 317 g of octylic acid was weighed, placed in a 1-liter separable flask, and 160 g of a 25% aqueous sodium hydroxide solution was added with stirring to produce sodium octylate. Put this solution at 60 ° C
And 590 ml of an aqueous solution of cobalt sulfate adjusted to a cobalt concentration of 100 g / l was added over 30 minutes to produce cobalt octylate. The sodium sulfate by-produced at this time was removed by washing with water. Heating the obtained cobalt octylate solution to 140 ° C.,
The contained water was removed. Next, octylic acid 113
g, and 470 g of a cobalt octylate solution was obtained.
The cobalt content of the cobalt octylate solution is 12.4
% And the viscosity of the solution was 280 poise (30 ° C.). One week later, the viscosity of the solution was measured.
It was 80 poise (30 degrees C) and there was no change. Example 3 317 g of octylic acid was weighed and placed in a 1-liter separable flask, and 160 g of a 25% aqueous sodium hydroxide solution was added with stirring to produce sodium octylate. Put this solution at 60 ° C
And 590 ml of an aqueous solution of cobalt sulfate adjusted to a cobalt concentration of 100 g / l was added over 30 minutes to produce cobalt octylate. The sodium sulfate by-produced at this time was removed by washing with water. Heating the obtained cobalt octylate solution to 140 ° C.,
The contained water was removed. Next, octylic acid 143
g, and 500 g of a cobalt octylate solution was obtained.
The cobalt content of the cobalt octylate solution was 11.8.
% And the viscosity of the solution was 140 poise (30 ° C.). One week later, the viscosity of the solution was measured.
It was 40 poise (30 degrees C) and there was no change. Comparative Example 1: A decrease in viscosity was attempted using a petroleum-based solvent instead of octylic acid.
No fluid thing was obtained. That is, octylic acid 3
17 g is weighed, placed in a 1 liter separable flask, and stirred with a 25% aqueous sodium hydroxide solution 160
g was added to produce sodium octylate. To this solution was added 123 g of solvent aroma free solvent No. 6 (AF-6) manufactured by Nippon Oil Co., Ltd., and the mixture was maintained at 60 ° C.
590 ml of an aqueous solution of cobalt sulfate adjusted to a cobalt concentration of 100 g / liter was added over 30 minutes to produce cobalt octylate. The sodium sulfate by-produced at this time was removed by washing with water. The obtained cobalt octylate solution was heated to 140 ° C. to remove the contained water, thereby obtaining 490 g of a cobalt octylate solution. The cobalt content of the cobalt octylate solution is 1
Although it was 2.1%, the viscosity of the solution solidified when cooled to 30 ° C. Comparative Example 2: Under the conditions of Comparative Example 1, a small amount of a viscosity reducing agent was added. Although the viscosity immediately after the addition was low, phase separation occurred in about one week and was unstable with time. That is, 317 g of octylic acid was weighed, placed in a 1-liter separable flask, and 160 g of a 25% aqueous sodium hydroxide solution was added with stirring to produce sodium octylate. To this solution was added 123 g of Aroma Free Solvent No. 6 (AF-6) manufactured by Nippon Oil Co., Ltd.
590 ml of an aqueous solution of cobalt sulfate maintained at 0 ° C. and adjusted to a cobalt concentration of 100 g / l,
Added over minutes to produce cobalt octylate. The sodium sulfate by-produced at this time was removed by washing with water. The obtained cobalt octylate solution was heated to 140 ° C. to remove water contained therein, thereby obtaining 490 g of a cobalt octylate solution. The solution was cooled to 50 ° C., and 5 g of hexylene glycol and 2 g of ion-exchanged water were added as a viscosity reducing agent. The cobalt content of the cobalt octylate solution is 12.3% and the viscosity of the solution is 3%.
It was 35 poise (30 degrees C). However, upon standing for one week, the mixture separated into two phases, and the viscosity of the upper layer was 6 poise and the viscosity of the lower layer was 320 poise. The desiccant for printing ink comprising the cobalt octylate solution of the present invention, when mixed with the printing ink, has high compatibility, has no odor, and therefore has excellent workability. It can provide a printing ink, and becomes a highly stable drying ink for printing ink when stored. Since it can be adjusted without using a solvent, it does not use volatile organic compounds as solvents conventionally used, especially aromatic compounds, so that it takes into account odor pollution and environmental problems associated with its disposal. You don't need to. Note that the present invention can provide the same effect when used for paints and the like.

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Hideki Muto             1-18-13, Nakane, Soka City, Saitama, Japan             Gakkai Sangyo Co., Ltd. (72) Inventor Kazuyuki Suenaga             1-18-13, Nakane, Soka City, Saitama, Japan             Gakkai Sangyo Co., Ltd. (72) Inventor Jiro Oda             1-18-13, Nakane, Soka City, Saitama, Japan             Gakkai Sangyo Co., Ltd. F-term (reference) 4J039 BC27 EA12

Claims (1)

Claims 1. A cobalt octylate having 8 to 1 carbon atoms.
0 organic carboxylic acid, and cobalt metal is 10 to 1
The cobalt octylate solution containing 4% was added to 30
A desiccant for printing ink, comprising a cobalt octylate solution adjusted to a viscosity of 20 to 500 poise at a degree C.