KR20150068614A - capsule containing metal drier and and method for Forming the same, ink composite including capsule containing metal drier - Google Patents

Abstract

The present invention relates to a printing ink composition including a metal drying agent capsule, the composition comprising a mixture of: 10 to 30 parts by weight of pigment; 20 to 40 parts by weight of rosin-modified phenolic resin; 10 to 30 parts by weight of drying oil and semi-drying oil; 0.1 to 2 parts by weight of a metal drying agent capsule; and 25 to 50 parts by weight of solvent. The metal drying agent capsule comprises a core for metal drying having a porous carrier and a metal drying agent which is immersed in pores of the carrier; and a hydrophilic coating layer surrounding the core for metal drying. The metal drying agent capsule is added to an ink and a coating is easily removed by water contained in a fountain solution as the fountain solution is applied on a printing plate in the printing process. Accordingly, the present invention has the effect of a quick drying with the expression of drying performance.

Description

TECHNICAL FIELD [0001] The present invention relates to a metal desiccant capsule, a metal desiccant encapsulate, a method for producing the same, and an ink composition including a metal desiccant capsule,

The present invention relates to a metal desiccant capsule, a method of producing the same, and an ink composition comprising the metal desiccant capsule. More particularly, the present invention relates to a metal desiccant capsule coated with a hydrophilic resin, .

Typical ink compositions consist of pigments, resins, solvents, oils and additives. Sheetfed inks used in catalogs, flyers, and high-end publishing prints accelerate the drying of prints by promoting oxidative polymerization of oil using metal desiccants. The use of such a metal drying agent can shorten the drying time of the printed material and shorten the working time and increase the productivity. A technique using such a metal desiccant is disclosed in Korean Patent Publication No. 2013-0073358.

However, the use of such a drying agent causes storage of the ink, skinning of the ink on the ink container and the printing roller, resulting in problems of storage and printing of the ink. Therefore, in order to increase the storage stability of the ink while preventing the skinning, the polymerization inhibitor which inhibits the activity of the metal desiccant is used together with the drying inhibitor to slow the skinning.

However, since the hydroquinone-based organic compounds used as such a drying inhibitor are classified as harmful substances having the possibility of cytotoxicity, mutagenicity and carcinogenicity, a method of preventing the skinning by lowering the use of the drying inhibitor is required.

One object of the present invention is to lower the activity of a metal desiccant agent during ink storage to prevent printing skinning without using a drying inhibitor, and at the same time, when a printing plate is applied with a dampening liquid, The present invention provides a metal desiccant capsule and a method for producing the same, wherein the desiccating performance is exhibited due to the removal of the coating of the metal desiccant capsule.

Another object of the present invention is to provide an ink composition which is capable of preventing printing skinning without using a drying inhibitor by lowering the activity of a metal drying agent during ink storage, and exhibiting drying performance in a printing process and improving storage stability.

A metal desiccant capsule for achieving the object of the present invention is a hydrophilic coating film which surrounds a core material for a metal desiccant and a core material for at least one metal desiccant including a porous carrier having pores and a metal desiccant carried in the pores of the carrier .

According to one embodiment, the porous carrier includes hydrophobic silica having porosity, and cobalt naphthenate is selected as the metal drying agent. However, silica, porous resin, etc. having porosity may be selected as the support, and the metal drying agent may be selected from cobalt, manganese and salts thereof. The hydrophilic coating may be formed of a hydrophilic resin.

In order to accomplish the object of the present invention, a metal desiccant capsule is prepared by firstly mixing a porous carrier having pores and a metal drying body of liquid, a step of dry-milling the first mixture formed by the first mixing, A step of forming a support powder, a second mixing step of mixing the powder of the porous support bearing the metal desiccant and the aqueous solution of the hydrophilic resin, and a step of dropping a resin precipitation solvent into the second mixture formed by the second mixing, And then precipitating particles coated with a hydrophilic coating film on the porous carrier.

According to one embodiment, it is possible to further carry out the step of filtering the precipitated particles with a filter of 30 to 70 mu m and drying and pulverizing in a vacuum oven at 50 to 70 DEG C to prepare a metal desiccant capsule.

The printing ink composition for achieving the object of the present invention comprises 10 to 30 parts by weight of a pigment, 20 to 40 parts by weight of a rosin-modified phenolic resin, 10 to 30 parts by weight of a drying oil and semi-drying oil, 0.1 to 2 parts by weight of a metal desiccant capsule, By weight to 50 parts by weight.

According to one embodiment, the metal desiccant capsule includes a core for a metal desiccant including a porous carrier having pores and a metal desiccant carried in the pores of the carrier. And a hydrophilic coating film surrounding the core material for the metal desiccant.

The metal desiccant capsules according to the embodiments of the present invention are characterized in that when the dampening liquid is applied to the printing plate in the printing process, the coating of the metal desiccant capsules is removed by the water contained in the dampening liquid, The stability can be improved.

In addition, since the ink containing the metal desiccant capsules contains the encapsulated metal desiccant, the activity of the desiccant during storage can be lowered to prevent skinning without using a drying inhibitor.

In addition, the encapsulated desiccant prepared in the present invention is added to the ink, and when the dampening solution is applied to the printing plate in the printing process, the coating is effectively removed by the water contained in the dampening solution, so that the drying performance is developed, Effect.

Hereinafter, a metal desiccant capsule according to an embodiment of the present invention, a method for producing the same, and a printing ink composition containing the same will be described in detail. While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are further described in the text. It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a part or a combination thereof is described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

On the other hand, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Metal desiccant capsules and process for their preparation

The metal desiccant capsule according to the present invention is a metal desiccant applied to a printing ink. The metal desiccant capsule is formed of a core material including a carrier on which a metal desiccant is supported, and a coating film surrounding the core material. And a coating film surrounding the outer surface of the at least one core material is a hydrophilic film formed by coating a surface of the at least one core material with a hydrophilic resin such as polyvinyl acetate or gelatin.

Examples of the metal desiccant include cobalt, manganese, and salts thereof. Examples of the cobalt salt include cobalt naphthenate, cobalt octoate and the like, and manganese salts include manganese naphthenate, manganese octoate and the like. Examples of the porous carrier include hydrophilic or hydrophobic silica and superabsorbent resin, which are porous materials.

As an example, the core material constituting the inside of the metal drying agent is in the state that the metal drying agent is supported in the pores of the porous support, and the average particle size of the hydrophobic silica is preferably 1 to 5 탆 . In addition, the porous carrier preferably has an oil absorption of 100 ml / 100 g or more in order to support a metal desiccant.

Also, the content of the metal desiccant may be increased depending on the amount of the metal desiccant absorbed in the hydrophobic silica as the porous support. For example, when the porous carrier to be applied to the metal desiccant capsule is hydrophobic silica, the content ratio of the hydrophobic silica to the metal desiccant is in the range of 1: 1.5 to 3% by weight, and the ratio of 1: 1.5 to 2.5% .

In order to produce a metal dry capsule having the above-described structure, first, a porous carrier having pores and a liquid metal drying agent are first mixed to form a first mixture. Specifically, to form the first mixture, a liquid metal drying agent may be diluted with a volatile solvent. After that, the porous drying agent is stirred to absorb the metal drying agent in the hydrophobic silica to form a first mixture.

Next, the first mixture formed by the first mixing is dried and pulverized to form a core material which is a porous carrier powder on which a metal drying agent is supported. The core material may be prepared by drying the first mixture in a vacuum oven at about 40 to 70 캜 to remove solvents and volatile impurities, and then pulverizing the first mixture.

Next, a core material, which is a powder of the porous carrier bearing the metal desiccant, is mixed with a hydrophilic resin aqueous solution to form a second mixture, and then a resin precipitation solvent is dropped into the second mixture to finally obtain a porous desiccant The particles coated with a hydrophilic coating film are formed by precipitation. The precipitated particles may be formed into a metal desiccant capsule by filtering with a filter of about 30 to 70 mu m and then drying and pulverizing in a vacuum oven at 50 to 70 DEG C. [ The thus formed metal desiccant capsules have a structure in which a hydrophilic coating film is formed on the surface of the porous support body powder on which the metal desiccant is supported.

Printing ink containing metal desiccant capsules

The printing ink composition comprising a metal desiccant capsule according to an embodiment of the present invention comprises 10 to 30 parts by weight of a pigment, 20 to 40 parts by weight of a rosin-modified phenolic resin, 10 to 30 parts by weight of a drying or semi-drying oil, 2.0 parts by weight and 25 to 50 parts by weight of a solvent are mixed.

As an example, the pigments to be applied to the printing ink composition to which the present invention is applied may be organic or inorganic pigments generally used for offset inks. These may be used singly or in a mixture of two or more. When the content of the pigment is less than 10 parts by weight in the printing ink having the composition described above, the concentration of the ink is lowered and the fluidity and emulsification amount are increased to deteriorate the printability. When the amount exceeds 30 parts by weight, Printing problems due to defects occur. Therefore, the pigment content in the above-mentioned composition is in the range of 10 to 30 parts by weight, more preferably in the range of 15 to 25 parts by weight.

 As an example, if the amount of the rosin-modified phenol resin to be applied to the printing ink composition having the above composition is less than 20 parts by weight, the dispersibility of the pigment and the viscosity of the ink are increased to cause contamination of the non-drawn portion. There arises a problem that scattering occurs during printing and the reproducibility of the halftone dot becomes poor. Therefore, the above-mentioned composition preferably has a varnish content of 20 to 40 parts by weight, more preferably 25 to 35 parts by weight.

For example, when the content of the metal desiccant capsules is less than 0.1 parts by weight, the effect of the drying agent is not sufficiently exhibited. When the amount of the metal desiccant capsules is more than 2 parts by weight, the flow of the ink is slowed, So that the workability is lowered. Therefore, the content of the metal desiccant capsules in the above-mentioned composition should be in the range of 0.1 to 2.0 parts by weight, more preferably 0.3 to 1.0 parts by weight. The detailed description of the metal desiccant capsules applied to the ink composition of the present invention is described above in detail and is omitted in order to avoid redundancy.

As one example, pung oil, linseed oil, soybean oil and the like may be used as the drying oil or semi-drying oil applied to the printing ink composition having the above composition. These may be used singly or in a mixture of two or more. When the content of the drying or semi-drying oil applied to the printing ink composition having the above composition is less than 10 parts by weight, the gloss is lowered and the drying property is lowered. When the content is more than 30 parts by weight, the ink is emulsified during printing, . Therefore, the content of the drying or semi-drying oil in the above-described composition is in the range of 10 to 30 parts by weight, more preferably in the range of 10 to 20 parts by weight. In this embodiment, iodine value of about 100 to about 250 and saponification value of about 170 to about 220 can be used.

The solvent to be used for forming the printing ink composition of the present invention may be an organic solvent. Examples of these solvents include paraffin solvents, naphthenic solvents and olefin solvents. These solvents may be used singly or in combination of two or more thereof. The amount of the solvent used in this embodiment may vary greatly depending on the viscosity of the ink and the printing method of the ink, but it is preferable to use the solvent within the range of 10 to 45 parts by weight.

The metal desiccant capsules contained in the printing ink composition of the present invention have the potential to increase the activity of the desiccant during storage, and when the dampening solution is applied to the printing plate in the printing process, Lt; / RTI >

Hereinafter, the constituent elements and technical features of the present invention will be described in more detail through the following production examples and examples. However, the following examples are intended to illustrate the present invention in detail and do not limit the scope of the present invention to those exemplified in these examples.

Manufacturing example  One

10 g of the hydrophobic silica as the porous carrier and 25 g of the liquid metal drying cobalt naphthenate were mixed first to form a first mixture, and then the first mixture was dried at about 60 캜 in a vacuum oven to remove solvent and volatile impurities. Thereafter, it was pulverized to form a core material of hydrophobic silica powder carrying cobalt naphthenate. Subsequently, 2 g of the obtained core material powder was added to 100 g of a polyvinyl acetate aqueous solution (concentration of 6 wt%) and mixed at a speed of 5000 rpm to form a second mixture. To the mixture was added 200 ml of isopropyl alcohol as a resin precipitation solvent at a rate of 3 ml per minute And the preliminary metal desiccant capsules were precipitated. The preliminary metal desiccant capsule thus precipitated is formed into a metal desiccant capsule by filtering with a 50 탆 filter and then drying and pulverizing in a 60 캜 vacuum oven.

Production Example 2

10 g of benzene was dissolved in 10 g of cobalt naphthenate as a metal carrier and then mixed with 5 g of hydrophobic silica as a porous support to form a first mixture. Then, the first mixture was dried in a vacuum oven at about 60 캜 for drying, The impurities were removed. Thereafter, it was pulverized to form a core material of hydrophobic silica powder carrying cobalt naphthenate. Subsequently, 2 g of the obtained core material powder was added to 100 g of a polyvinyl acetate aqueous solution (6 wt% concentration) and mixed at a speed of 5000 rpm to form a second mixture. 150 ml of isopropyl alcohol as a resin precipitation solvent was added to the mixture at a rate of 3 ml per minute And the preliminary metal desiccant capsules were precipitated. The preliminary metal desiccant capsule thus precipitated is formed into a metal desiccant capsule by filtering with a 50 탆 filter and then drying and pulverizing in a 60 캜 vacuum oven.

Production Example 3

8.8 g of metal dried cobalt naphthenate (10%) was dissolved in 11 g of benzene and then mixed with 5 g of hydrophobic silica as a porous support to form a first mixture. Then, the first mixture was placed in a vacuum oven at about 60 ° C. And dried to remove solvents and volatile impurities. Thereafter, it was pulverized to form a core material of hydrophobic silica powder carrying cobalt naphthenate. Subsequently, 2 g of the obtained core material powder was mixed with 100 g of 2 wt% gelatin aqueous solution at a rate of 5000 rpm to form a second mixture. 100 ml of acetone as a resin precipitation solvent was added dropwise to the mixture at a rate of 5 ml per minute to prepare a preliminary metal desiccant capsule Respectively. The preliminary metal desiccant capsule thus precipitated is formed into a metal desiccant capsule by filtering with a 50 탆 filter and then drying and pulverizing in a 60 캜 vacuum oven.

Example 1

20 parts by weight of pigment, 27 parts by weight of rosin-modified phenol resin, 0.4 parts by weight of a metal desiccant capsule of Preparation Example 1, 2 parts by weight of drying oil, 12 parts by weight of semi-drying oil and 38.5 parts by weight of solvent were mixed to prepare a printing ink composition.

Example 2

20 parts by weight of the pigment, 27 parts by weight of the rosin-modified phenolic resin, 0.4 parts by weight of the metal desiccant capsule of Preparation Example 2, 2 parts by weight of the drying oil, 12 parts by weight of the semi-drying oil and 38.5 parts by weight of the solvent were mixed to prepare a printing ink composition.

Example 3

20 parts by weight of pigment, 27 parts by weight of rosin-modified phenolic resin, 0.5 part by weight of a metal desiccant capsule of Preparation Example 3, 2 parts by weight of drying oil, 12 parts by weight of semi-drying oil and 38.5 parts by weight of solvent were mixed to prepare a printing ink composition.

Comparative Example 1

20 parts by weight of pigment, 27 parts by weight of rosin-modified phenol resin, 0.5 parts by weight of metal drying agent, 1 part by weight of drying inhibitor, 2 parts by weight of drying oil, 12 parts by weight of semi-drying oil and 37.5 parts by weight of solvent were mixed to prepare a printing ink composition.

Evaluation of dryness of ink

In order to evaluate the performance of the metal desiccant capsules, the drying time of the inks of Examples 1 to 3 and Comparative Example 1, in which the metal desiccant capsules were included, was compared with that of Examples 1 to 3 and Comparative Example 1 The drying time of the forced emulsified ink by adding a 15 wt% wetting solution to the ink was compared. At this time, the higher the time before emulsification, the greater the prevention of skinning, and the shorter the time after emulsification, the faster the drying time after printing.

1) Drum dryer evaluation

The ink after emulsification ink and emulsified ink were transferred to a 105 g weighted lozenge paper and dried at 40 ° C using a drum dryer. The results are shown in Table 1 below.

(Table 1)

The drying time after emulsification was faster in the case of using the metal drying capsules than in the case of using the drying inhibitor, and the drying performance of Example 3 was the most excellent

2) Skinning evaluation

EXAMPLES 1 TO 3 AND COMPARATIVE EXAMPLE 1 Ink before emulsification and Examples 1 to 3 and Comparative Example 1 After emulsification, the ink was coated on a glass plate with a coating film having a thickness of 60 탆, placed in an oven at 50 캜, Are shown in Table 2 below.

(Table 2)

The drying time after emulsification was faster than the case of using the drying inhibitor except for Example 2, and the drying performance of Example 3 was the most excellent when the metal dry capsule was used

Claims (5)

A core for a metal desiccant comprising a porous carrier having pores and a metal drying agent carried in the pores of the carrier; And
And a hydrophilic coating film surrounding the core material for the metal desiccant. The method of claim 1, wherein the porous carrier is porous hydrophobic silica or a porous resin, and the metal drying agent is selected from the group consisting of cobalt, manganese, and salts thereof such as cobalt naphthenate, cobalt octoate, manganese naphthenate, manganese octoate, Wherein the metal desiccant encapsulant comprises one selected from the group consisting of: Mixing a porous carrier having pores and a liquid metal drying body in a first mixing step;
Drying and pulverizing the first mixture formed by the first mixing to form a powder of a porous carrier having a metal drying agent carried thereon;
A second mixing step of mixing the powder of the porous carrier on which the metal desiccant is supported and the aqueous solution of the hydrophilic resin; And
And depositing a hydrophilic coating film-coated particles on the porous carrier carrying the metal desiccant by dripping a resin precipitation solvent into the second mixture formed by the second mixing. 10 to 30 parts by weight of a pigment, 20 to 40 parts by weight of a rosin-modified phenolic resin, 10 to 30 parts by weight of a drying or semi-drying oil, 0.1 to 2.0 parts by weight of a metal desiccant capsule and 25 to 50 parts by weight of a solvent. 5. The metal desiccant capsule according to claim 4, wherein the metal desiccant capsule comprises: a core for a metal desiccant comprising a porous carrier having pores and a metal desiccant carried in the pores of the carrier; And a hydrophilic coating film surrounding the core material for the metal desiccant.