JP5759250B2 - Method for producing resin varnish for offset printing ink - Google Patents

Description

The present invention relates to the production how offset printing ink resin varnish.

  Offset printing is a printing method characterized in that ink supplied on a printing plate is transferred to an intermediate transfer body such as a rubber blanket and then printed on a printing medium such as paper. Offset printing is a typical printing method widely used in fields such as commercial printing and newspaper printing because it can print a large amount of high-definition and clear images in a short time. . In offset printing ink compositions used in this printing method, rosin-modified phenolic resin, rosin-modified maleic acid resin and the like are widely used as main resin components. Although the molecular weight of the resin constituting these resin components varies depending on the type, it is generally several tens of thousands to several hundreds of thousands, and the softening point varies from about 150 ° C. to over 200 ° C. . The resin constituting the resin component is generally properly used depending on the required properties of the offset printing ink composition.

  The offset printing ink composition basically comprises an oil component material comprising a mineral oil component and / or a vegetable oil component, a resin and a pigment, but is not produced by mixing them at once. In general, first, a resin is generally dissolved in an oil component material, and an intermediate called a resin varnish for offset printing ink (hereinafter sometimes simply referred to as “varnish”) is generated. And a pigment and various additives are mix | blended with a varnish, and the composition for offset printing inks is finally obtained.

  By the way, the resin constituting the resin component of the composition for offset printing ink is usually synthesized by bulk polymerization (bulk polymerization) in a resin maker, and pulverized into a block or flake solid resin as an ink maker To be supplied. Such a solid resin in a lump state does not dissolve even if it is directly mixed with the oil component material. Therefore, when the varnish is produced by dissolving the solid resin in the oil component material, in the step of dissolving the solid resin in the oil component material (hereinafter sometimes referred to as “cooking step”), the solid resin is used as the oil component material. After the addition, the solid resin is stirred and mixed while being softened by heating above the softening point of the solid resin, and the solid resin is dissolved in the oil component material.

  The cooking step is usually performed at a high temperature of about 180 to 250 ° C., although depending on the type of solid resin. Further, even when stirring and mixing at a high temperature, it is necessary to stir and mix for a long time in order to completely dissolve the high-molecular weight solid resin having low solubility in the oil component material.

  Thus, when manufacturing a varnish, in a cooking process, since solid resin and an oil component material are stirred and mixed over a long time under high temperature, much heat energy is required. However, since the varnish obtained by stirring and mixing at a high temperature for a long time is stored or used at a temperature from room temperature (about 25 ° C.) to about 100 ° C., much of the thermal energy input in the cooking process Will be diffused in the atmosphere by cooling. Therefore, the heat energy for that amount must be wasted.

  Furthermore, when the oil component material that dissolves the solid resin is an animal or vegetable oil, when the cooking process is performed at a temperature higher than 200 ° C., it is selected from a rosin-modified phenolic resin or a rosin-modified maleic resin that is a kind of polyester resin. There occurs a problem that a transesterification reaction occurs between the solid resin and the animal and vegetable oil (for example, tri-fatty acid ester of glycerin), and the molecular weight of the solid resin is lowered. When the molecular weight of the solid resin is reduced, an increase in ink misting or occurrence of facing set-off occurs at the time of printing, and printability is greatly reduced. Therefore, it is necessary to suppress the occurrence of transesterification during the stirring and mixing of the solid resin and the oil component material in the cooking step when manufacturing the varnish.

  In order to suppress the transesterification reaction, it is effective to use mineral oil as an oil component material that dissolves the solid resin or to lower the temperature during stirring and mixing. However, increasing the amount of mineral oil used is contrary to the movement of replacing the oil component of the offset printing ink composition from mineral oil to animal or vegetable oil for the purpose of reducing the environmental burden. Moreover, in order to lower the temperature at the time of stirring and mixing in the cooking step, it is sufficient to use a solid resin having a low softening point, but a solid resin having a low softening point is generally a resin having a low molecular weight. . For this reason, offset printing ink compositions that use a solid resin with a low softening point as the resin component cannot avoid increased ink misting or face-to-face set-off during printing, greatly reducing printability. To do.

  In order to solve such a problem, for example, in Patent Document 1, a solid resin is dissolved in a high-boiling solvent such as mineral oil at a high temperature (200 ° C. or higher), and then at a low temperature (80 to 180 ° C.). A method for producing a resin varnish for printing ink that dissolves in animal and vegetable oils is disclosed. According to the method for producing a varnish disclosed in Patent Document 1, mineral oil is used as the oil component material in the step of dissolving the solid resin at a high temperature, and no animal or vegetable oil is present. The transesterification reaction with the material can be suppressed to some extent. Moreover, in the manufacturing method of the varnish disclosed by patent document 1, since it can suppress that the cooking process under high temperature becomes long time, the thermal energy loss at the time of a cooking process can be decreased.

  In Patent Document 2, a varnish in which a rosin-modified phenol resin is dissolved in an oil component material is prepared by subjecting a rosin ester resin and a phenol formaldehyde initial condensate to a condensation reaction in the oil component material. A method for producing a resin varnish for printing ink is disclosed. According to the method for producing a varnish disclosed in Patent Document 2, since it is not necessary to dissolve the solid resin in the oil component material, the thermal energy loss can be reduced.

  Patent Document 3 discloses a method for producing a gel varnish in which a mixture containing at least a resin, a gelling agent, and an organic solvent is heated at 150 ° C. or lower to increase the molecular weight of the resin to produce a varnish. According to the method for producing a gel varnish disclosed in Patent Document 3, since the gel varnish is produced under a relatively low temperature of 150 ° C. or lower, the thermal energy loss can be reduced.

JP 2005-47950 A Japanese Patent Laid-Open No. 10-88052 JP 2011-12187 A

  However, since the manufacturing method of the varnish disclosed in Patent Document 1 includes a step of dissolving the solid resin in the oil component material at a high temperature, it is a manufacturing method capable of sufficiently reducing thermal energy loss. I can't say that. Moreover, in the varnish manufacturing method disclosed in Patent Document 2, a reaction equipment for condensing a rosin ester resin and a phenol formaldehyde initial condensate, a transport equipment and a storage equipment for transporting and storing the produced high viscosity varnish are newly provided. The varnish cannot be manufactured in a simplified state using existing equipment. Moreover, in the manufacturing method of the gel varnish disclosed in Patent Document 3, as the gel varnish is manufactured under a relatively low temperature of 150 ° C. or less, the manufacturing time becomes long, and thermal energy loss is reduced. It cannot be said that it is a production method that can be sufficiently reduced.

Therefore, an object of the present invention is to provide can be suppressed low molecular weight of the solid resin by an ester exchange reaction, a method of manufacturing an offset printing ink resin varnish can be reduced thermal energy loss.

The present invention is a charging step in which a solid resin and an oil component material are charged into a tank in which a cutter blade is provided in the internal space;
In a state where the tank is heated at a predetermined heating rate so that the ultimate temperature is 80 to 200 ° C., the cutter blade is driven to rotate around the axis of the rotation shaft, and the solid resin is crushed and dissolved in the oil component material And crushing and dissolving step
The cutter blade is
A plate-like base fixed perpendicularly to a rotation axis that is driven to rotate about an axis that is collinear with the center axis of the tank, and a rotation diameter at the tip of the outermost peripheral edge that extends radially outward from the base. Having a blade that is 30-80% of the inner diameter of the tank,
In the pulverization and dissolution step, the peripheral speed of the tip at the outermost peripheral edge of the blade is rotationally driven at a speed of 10 m / s or more,
The blade is
A first blade which is inclined so as to be separated from one side with respect to the rotation surface of the base as it goes radially outward from the base;
As the radial direction outwards from the base portion , the first blade is inclined with respect to the rotation surface of the base portion so as to be separated in the direction opposite to the direction in which the first blade is inclined with respect to the rotation surface of the base portion . Two blades,
It is a manufacturing method of the resin varnish for offset printing ink characterized by including the 3rd braid | blade which continues in a radial direction outward from a base, and is parallel to the rotation surface of the said base.

  The present invention is also characterized in that the solid resin is a rosin-modified phenol resin having a softening point of 130 ° C. or higher.

  Further, the present invention is characterized in that in the charging step, the amount of the oil component material charged into the tank is 100 to 180% by mass of the amount of the solid resin charged.

  Further, in the invention, the first and second blades are bent at a position where the base end portion on the upstream side in the rotational direction is separated from the base end portion on the downstream side in the rotational direction in the radial direction, and continues to the base portion. It is characterized by being.

  Further, the present invention is characterized in that edge portions of the first, second and third blades facing the downstream side in the rotational direction are formed in a tapered shape facing the downstream side in the rotational direction.

  According to this invention, the manufacturing method of the resin varnish for offset printing inks includes a preparation process and a crushing dissolution process. First, in a preparation process, solid resin and an oil component material are prepared in a tank in which a cutter blade is provided in the internal space. Next, in the pulverizing and dissolving step, the solid resin is pulverized by rotating the cutter blade around the axis of the rotating shaft while the tank is heated at a predetermined rate of temperature increase so that the ultimate temperature is 80 to 200 ° C. While dissolving in the oil component material. Here, the cutter blade provided inside the tank includes a base and a blade. The base is a plate-like portion that is fixed perpendicular to a rotation shaft that is driven to rotate about an axis that is collinear with the central axis of the tank. The blade is a portion that extends radially outward from the base, and is formed such that the rotational diameter at the tip of the outermost peripheral edge is 30 to 80% with respect to the inner diameter of the tank. In the pulverizing and dissolving step, the cutter blade is rotationally driven at a speed at which the peripheral speed of the tip portion at the outermost peripheral edge of the blade is 10 m / s or more.

  In the pulverization and dissolution process, the cutter blade including a blade having a predetermined rotation diameter with respect to the inner diameter of the tank is rotationally driven at a predetermined peripheral speed, so that sufficient shearing force is applied to the solid resin accommodated in the tank. Thus, stirring and mixing can be performed while pulverizing the solid resin in the oil component material. Therefore, the solid resin can be dissolved in the oil component material without stirring and mixing the solid resin and the oil component material at a temperature higher than 200 ° C. beyond the softening point of the solid resin. Specifically, in a state where the tank is heated at a predetermined rate of temperature so that the ultimate temperature is 80 to 200 ° C., the cutter blades are driven to rotate, so that the solid resin is crushed and dissolved in the oil component material Can be made.

As described above, since the solid resin can be dissolved in the oil component material while being pulverized at a temperature of 200 ° C. or lower, the reduction in the molecular weight of the solid resin due to the transesterification reaction can be suppressed. Therefore, in the manufacturing method of the resin varnish for offset printing ink, the varnish used as the raw material of the composition for offset printing ink which has high printability can be obtained. Moreover, in the manufacturing method of the resin varnish for offset printing ink, since solid resin can be dissolved in an oil component material at the temperature of 200 degrees C or less, a thermal energy loss can be decreased.
Moreover, the cutter blade provided in the tank includes a base, a first blade, and a second blade. The base is a plate-like portion that is fixed perpendicularly to a rotation shaft that is rotationally driven. The first blade is a blade that is inclined so as to be separated to one side with respect to the rotation surface of the base as it goes radially outward from the base. As the second blade is radially outward from the base, the second blade is inclined so as to be separated in the direction opposite to the direction in which the first blade is inclined so as to be separated from the rotational surface of the base. Blade.
In the pulverization and dissolution step, the cutter blades having the first and second blades inclined so as to be separated from one side and the other side with respect to the rotation surface of the base portion are rotationally driven to stir and mix the solid resin and the oil component material. Therefore, a large shearing force can be imparted to the solid resin, and the pulverization efficiency of the solid resin in the oil component material can be improved. Therefore, in the pulverization and dissolution step, the solid resin can be dissolved in the oil component material even when the heating temperature during the stirring and mixing of the solid resin and the oil component material is reduced or the stirring time is shortened. Therefore, in the pulverization and dissolution step, it is possible to further suppress the reduction in the molecular weight of the solid resin due to the transesterification reaction, and it is possible to reduce the thermal energy loss.
The cutter blade provided in the tank further includes a third blade that extends radially outward from the base and is parallel to the rotation surface of the base. Thus, in the pulverization and dissolution step, a large shearing force can be applied to the solid resin, and the pulverization efficiency of the solid resin in the oil component material can be further improved.

  Moreover, according to this invention, the solid resin thrown in in a tank is a rosin modified phenol resin which has a softening point of 130 degreeC or more. Since the rosin-modified phenolic resin having a softening point of 130 ° C. or higher is a solid resin having a molecular weight that is not too low, a varnish that is a raw material for a composition for offset printing ink having high printability can be obtained.

  Moreover, according to this invention, the preparation amount of the oil component material with respect to the inside of a tank in a preparation process is 100-180 mass% of the preparation amount of solid resin. As a result, a resin varnish for offset printing ink having a viscosity within a suitable range can be obtained.

  According to the present invention, in the cutter blade provided in the tank, the first and second blades are such that the base end portion on the upstream side in the rotational direction is separated radially outward from the base end portion on the downstream side in the rotational direction. It bends in position and continues to the base. In the crushing and dissolving step of stirring and mixing the solid resin and the oil component material by rotating the cutter blade configured as described above, when the cutter blade is driven to rotate, the mixture of the solid resin and the oil component material is used. A stirring flow acts. Therefore, since the mixture of the solid resin and the oil component material is stirred and mixed while flowing in the tank along the stirring flow, the pulverization efficiency of the solid resin in the oil component material can be improved. Therefore, in the pulverization and dissolution step, the solid resin can be dissolved in the oil component material even when the heating temperature during the stirring and mixing of the solid resin and the oil component material is reduced or the stirring time is shortened.

  According to the invention, the cutter blade provided in the tank is formed such that the edge portion facing the downstream side in the rotational direction of the first, second and third blades is tapered toward the downstream side in the rotational direction. Yes. In the crushing and dissolving step of stirring and mixing the solid resin and the oil component material by rotating the cutter blade configured as described above, when the cutter blade is driven to rotate, the edge of each blade formed in a tapered shape Is cut into the mixture of the solid resin and the oil component material. Thereby, the grinding efficiency of the solid resin in the oil component material can be improved. Therefore, in the pulverization and dissolution step, the solid resin can be dissolved in the oil component material even when the heating temperature during the stirring and mixing of the solid resin and the oil component material is reduced or the stirring time is shortened.

It is a figure which shows the structure of the stirring apparatus 1 used in the manufacturing method of the resin varnish for offset printing inks which is one Embodiment of this invention. It is a figure which shows the structure of the cutter blade | wing 10 with which the stirring apparatus 1 is equipped. FIG. 3 is a diagram illustrating a configuration of a cutter blade 20. FIG. 3 is a diagram illustrating a configuration of a cutter blade 30.

(Resin varnish for offset printing ink)
FIG. 1 is a diagram showing a configuration of a stirring device 1 used in a method for producing a resin varnish for offset printing ink according to an embodiment of the present invention.

  The manufacturing method of the resin varnish for offset printing ink which is one Embodiment of this invention is performed using the stirring apparatus 1, and includes a preparation process and a crushing dissolution process. The charging step is a step of charging the solid resin and the oil component material into the tank 2 provided in the stirring device 1 and provided with the cutter blade 10 in the internal space.

  The solid resin thrown into the tank 2 in the charging process is a resin roughly pulverized into blocks, flakes, or granules so as to prevent scattering and dust explosion associated therewith, and the particle diameter is about 10 to 500 mm. It is.

  Examples of the resin constituting the solid resin include synthetic resins and natural resins. For example, offset printing inks such as rosin-modified phenol resins, rosin-modified maleic resins, alkyd resins, polyester resins, petroleum resins, and gilsonite resins. Examples of the resin component include resins that are commonly used. Among these resins, a rosin-modified phenol resin or a rosin-modified maleic resin having a softening point of 130 ° C. or higher is preferable. Since the rosin-modified phenolic resin or rosin-modified maleic acid resin having a softening point of 130 ° C. or higher is a solid resin having a molecular weight that is not too low, the offset is a raw material for a composition for offset printing ink having high printability. A resin varnish for printing ink can be obtained. A rosin-modified phenolic resin or rosin-modified maleic acid resin having a softening point of 130 ° C. or higher is a resin having a high effect of reducing thermal energy loss and an effect of suppressing transesterification with an oil component material in a pulverization and dissolution process described later. In contrast, a petroleum resin or gilsonite resin having a low softening point has high solubility in the oil component material and dissolves in the oil component material even if the stirring time in the pulverization and dissolution process is shortened.

  In addition, the softening point of solid resin can be measured using a flow characteristic evaluation apparatus (flow tester).

  Moreover, solid resin may be made to bridge | crosslink resin using the suitable quantity (about 15 mass% or less with respect to solid resin) of a gelatinizer. Examples of the gelling agent used in such a case include aluminum alcoholates and aluminum chelate compounds. Preferred specific examples include aluminum triisopropoxide, mono-sec-butoxyaluminum diisopropoxide, aluminum trioxide. Examples include -sec-butoxide, ethyl acetate aluminum diisopropoxide, and aluminum trisethyl acetoacetate.

  The oil component material introduced into the tank 2 in the preparation process is not particularly limited as long as it can dissolve the solid resin, and is commonly used as an oil component of offset printing inks such as those derived from vegetable oil and mineral oil. These oil component materials can be used, and these can be used alone or in combination.

  Examples of the oil component material derived from vegetable oil include vegetable oil itself, or fatty acid ester and polymerized oil using vegetable oil as a raw material. These can be used alone or in combination.

  As the vegetable oil, linseed oil, tung oil, soybean oil, rapeseed oil, cottonseed oil, corn oil, palm oil and the like can be used regardless of drying oil or non-drying oil, but when printing is dried by air oxidation after printing A dry oil or semi-dry oil is preferably used for. Among them, linseed oil, tung oil, and soybean oil are preferably used as the oil component of the offset printing ink composition, and these can be used alone or in combination.

  Examples of the fatty acid ester using the vegetable oil as a raw material include a monoester compound of a drying oil or a semi-drying oil. That is, the fatty acid constituting the fatty acid monoester is exemplified by fatty acids having an alkyl main chain of about 15 to 20 carbon atoms such as stearic acid, isostearic acid, hydroxystearic acid, oleic acid, linoleic acid, linolenic acid, and eleostearic acid. it can. Examples of the alcohol-derived alkyl group constituting the fatty acid monoester include alkyl groups having about 1 to 10 carbon atoms such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, and 2-ethylhexyl. Among them, soybean oil fatty acid monoester is preferable from the viewpoint of the drying property of the obtained offset printing ink composition. These fatty acid monoesters can be used alone or in combination of two or more.

  Here, in the ink and printing industry, it is recommended to use vegetable oil that is a resource that does not pollute the environment and that can be regenerated and esters derived from it, in order to reduce environmental impact. . For example, the Federation of Printing Ink Industries has begun to introduce a system that certifies inks that contain vegetable oil and esters made from it as a raw material that are at or higher than the standards defined as eco products. Thus, since the oil component material derived from vegetable oil is an environmentally friendly material, the oil component material derived from vegetable oil can be used as much as possible in the method for producing the resin varnish for offset printing ink of the present embodiment. This is particularly preferable because the environmental load can be reduced.

  Moreover, as an oil component material derived from mineral oil, mineral oil itself or a petroleum solvent is mentioned. Among them, an oil component material having a boiling point of 160 ° C. or higher, preferably 200 ° C. or higher, which is used as an oil component of the offset printing ink composition and is incompatible with water can be suitably used. Specifically, mineral oil such as light oil, spindle oil, machine oil, cylinder oil, turpentine oil, mineral spirit, n-paraffin solvent, isoparaffin solvent, naphthene solvent, aromatic solvent, α-olefin, etc. These petroleum solvents can be exemplified, and these solvents can be used singly or in combination of two or more, but it is preferable to use a non-aromatic solvent from the viewpoint of reducing environmental burden.

  And in a preparation process, it is preferable that the preparation amount of an oil component material is 100-180 mass% of the preparation amount of solid resin, and it is especially preferable that it is 120-150 mass%. As a result, a resin varnish for offset printing ink having a viscosity within a suitable range can be obtained.

  Further, in the preparation process, the procedure for charging the solid resin and the oil component material into the tank 2 is not particularly limited, and the solid resin and the oil component material may be simultaneously charged into the tank 2, The solid resin may be charged after the oil component material is charged. Alternatively, after the oil component material is introduced into the tank 2, the cutter blade 10 may be rotationally driven so that the solid resin is introduced into the tank 2 with stirring.

  Next, in the pulverization and dissolution process, which is a subsequent process of the preparation process, the cutter blade 10 is rotated around the rotation axis while the tank 2 is heated at a predetermined temperature increase rate so that the ultimate temperature is 80 to 200 ° C. The solid resin is dissolved in the oil component material while being pulverized.

  Here, the tank 2 is formed in a bottomed cylindrical shape and is made of a metal material such as stainless steel. A cutter blade 10 is provided inside the tank 2, and the position of the cutter blade 10 is 10 to 25% from the bottom surface 2 a of the tank 2 to the height Y1 of the tank 2. Position.

  Although details will be described later, the cutter blade 10 includes a base portion and a blade, and is a member made of a metal material such as stainless steel. The cutter blade 10 is rotationally driven so that when the blade collides with the solid resin, the area of the portion of the blade of the cutter blade 10 that contacts the solid resin is sufficient so that the solid resin can be cut or pulverized by the impact force. Is preferably small.

  A specific configuration of the cutter blade 10 will be described with reference to FIG. FIG. 2 is a diagram illustrating a configuration of the cutter blade 10 provided in the stirring device 1. FIG. 2A shows a development view of the cutter blade 10, FIG. 2B shows a plan view of the cutter blade 10, and FIG. 2C shows a side view of the cutter blade 10. FIG.

  The cutter blade 10 includes a base 11, a first blade 12, a second blade 13, and a third blade 14.

  The base portion 11 is a plate-like portion that is fixed vertically to a rotation shaft that is rotationally driven in the rotation direction A around a rotation axis that is collinear with the central axis of the tank 2, and has a shape when viewed in plan. It is a regular hexagon. In the cutter blade 10, a total of six blades including two first blades 12, two second blades 13, and two third blades 14 are equally spaced in the circumferential direction with respect to the rotation axis. The base 11 is formed so as to extend radially outward from each side of the regular hexagonal base 11. Each of the six blades 12, 13, and 14 is formed in the same shape and size, and in this embodiment, the shape when viewed in plan is a trapezoid.

  Further, in each of the six blades 12, 13, and 14, the length L2 in the extending direction extending radially outward from the base 11 is 150 with respect to the length L1 of each side of the regular hexagonal base 11. It is preferably set to ˜300% (in this embodiment, (L2 / L1) × 100 = about 250%). Thereby, the strength of the blades 12, 13, and 14 in the cutter blade 10 can be sufficiently ensured.

  Each of the two first blades 12 is a blade that is inclined so as to be separated to one side with respect to the rotation surface of the base 11 as it goes radially outward from the base 11. The first blades 12 are provided symmetrically with respect to the rotation axis.

  The inclination angle θ1 of the first blade 12 with respect to the rotation surface of the base 11 is preferably set to 30 to 45 ° (in this embodiment, the inclination angle θ1 = 45 °). Thereby, when the cutter blade 10 is rotationally driven, a stirring flow can be applied to the mixture of the solid resin and the oil component material accommodated in the tank, and the solid resin grinding efficiency in the oil component material Can be improved.

  Further, the first blade 12 is bent at a position where the first upstream base end portion 12a on the upstream side in the rotational direction A is separated radially outward from the first downstream base end portion 12b on the downstream side in the rotational direction A. The base 11 is connected. In the crushing and dissolving step of stirring and mixing the solid resin and the oil component material by rotating the cutter blade 10 configured as described above, when the cutter blade 10 is driven to rotate, the mixture of the solid resin and the oil component material is changed. On the other hand, a stirring flow acts. Therefore, since the mixture of the solid resin and the oil component material is stirred and mixed while flowing in the tank 2 along the stirring flow, the pulverization efficiency of the solid resin in the oil component material can be improved. Therefore, in the pulverization and dissolution step, the solid resin can be dissolved in the oil component material even when the heating temperature during the stirring and mixing of the solid resin and the oil component material is reduced or the stirring time is shortened.

  Furthermore, the first blade 12 has an edge portion 12 c that faces the downstream side in the rotation direction A and is tapered toward the downstream side in the rotation direction A. Thereby, when the cutter blade 10 is rotationally driven, the edge portion 12c of the first blade 12 formed in a tapered shape is cut into the mixture of the solid resin and the oil component material. Thereby, the grinding efficiency of the solid resin in the oil component material can be improved. Therefore, in the pulverization and dissolution step, the solid resin can be dissolved in the oil component material even when the heating temperature during the stirring and mixing of the solid resin and the oil component material is reduced or the stirring time is shortened. In addition, the thickness of the edge part 12c of the 1st braid | blade 12 formed in a taper shape is set to about 1 mm, while thickness except the edge part 12c is set to about 4 mm.

Each of the two second blades 13 is inclined in such a manner that the first blade 12 is separated from the rotation surface of the base portion 11 with respect to the rotation surface of the base portion 11 as going radially outward from the base portion 11. And a blade inclined so as to be separated in the opposite direction side (hereinafter referred to as “the other side ”) . The second blades 13 are provided symmetrically with respect to the rotation axis.

  The inclination angle θ2 of the second blade 13 with respect to the rotation surface of the base 11 is preferably set to 30 to 45 ° (in this embodiment, the inclination angle θ2 = 45 °). Thereby, when the cutter blade 10 is rotationally driven, a stirring flow can be applied to the mixture of the solid resin and the oil component material accommodated in the tank, and the solid resin grinding efficiency in the oil component material Can be improved.

  Further, the second blade 13 is bent at a position where the second upstream base end portion 13a on the upstream side in the rotational direction A is separated radially outward from the second downstream base end portion 13b on the downstream side in the rotational direction A. The base 11 is connected. In the crushing and dissolving step of stirring and mixing the solid resin and the oil component material by rotating the cutter blade 10 configured as described above, when the cutter blade 10 is driven to rotate, the mixture of the solid resin and the oil component material is changed. On the other hand, a stirring flow acts. Therefore, since the mixture of the solid resin and the oil component material is stirred and mixed while flowing in the tank 2 along the stirring flow, the pulverization efficiency of the solid resin in the oil component material can be improved.

  Further, the second blade 13 has an edge portion 13 c that faces the downstream side in the rotation direction A and is tapered so as to face the downstream side in the rotation direction A. Thereby, when the cutter blade 10 is rotationally driven, the edge portion 13c of the second blade 13 formed in a tapered shape is cut into the mixture of the solid resin and the oil component material. Thereby, the grinding efficiency of the solid resin in the oil component material can be improved. In addition, the thickness of the edge part 13c of the 2nd braid | blade 13 formed in a taper shape is set to about 1 mm, while thickness except the edge part 13c is set to about 4 mm.

  Each of the two third blades 14 is a blade that extends radially outward from the base 11 and is parallel to the rotation surface of the base 11. The third blades 14 are provided symmetrically with respect to the rotation axis. The third blade 14 has an edge portion 14a that faces the downstream side in the rotation direction A and is tapered so as to face the downstream side in the rotation direction A. As a result, when the cutter blade 10 is driven to rotate, the mixture of the solid resin and the oil component material is cut by the edge portion 14a of the third blade 14 formed in a tapered shape. Thereby, the grinding efficiency of the solid resin in the oil component material can be improved. In addition, the thickness of the edge part 14a of the 3rd braid | blade 14 formed in a taper shape is set to about 1 mm, while thickness except the edge part 14a is set to about 4 mm.

  As described above, a total of six blades including the two first blades 12, the two second blades 13, and the two third blades 14 are connected radially outward from the base 11. In the formed cutter blade 10, the rotation diameter L4 at the tip of the outermost peripheral edge corresponding to the length between the free ends of the two third blades 14 is 30 to the inner diameter Y2 of the tank 2. 80% is set.

  In the pulverizing and dissolving step, the peripheral speed of the free end of the third blade 14, that is, the peripheral speed of the tip of the outermost peripheral edge of each blade 12, 13, 14 is 10 m / s or more. The cutter blade 10 is driven to rotate. Further, in the pulverizing and dissolving step, the cutter blade 10 is driven to rotate in a state where the tank 2 is heated at a predetermined temperature increase rate so that the ultimate temperature is 80 to 200 ° C., preferably 80 to 140 ° C. The mixture of the solid resin and the oil component material contained therein is stirred and mixed, and dissolved in the oil component material while being pulverized so that the solid resin has a particle size of about 3 mm. Here, in this embodiment, the rate of temperature increase when the tank 2 is heated is set to 2 to 8 ° C./min.

  Also, the stirring and mixing time required to dissolve the solid resin in the oil component material can be shortened by stirring and mixing at a high temperature, but the amount of heat energy to be applied and the oil component material of the solid resin to be used The optimum temperature condition exists depending on the solubility in the mixture, and the stirring and mixing time to be set varies depending on the optimum temperature condition. The stirring and mixing time is 15 to 60 minutes as one guide when considering energy efficiency and workability. When the solid resin is dissolved in the oil component material and then the solid resin is crosslinked with a gelling agent, the cutter blade 10 is driven to rotate for 20 to 40 minutes under a temperature condition of 80 to 180 ° C. It is preferable to carry out a crosslinking reaction in a heated state.

  As described above, in the pulverizing and dissolving step, the cutter blade 10 including a blade having a predetermined rotation diameter with respect to the inner diameter Y2 of the tank 2 is rotationally driven at a predetermined peripheral speed. Sufficient shearing force is imparted to the resin, and stirring and mixing can be performed while pulverizing the solid resin in the oil component material. Therefore, the solid resin can be dissolved in the oil component material without stirring and mixing the solid resin and the oil component material at a temperature higher than 200 ° C. beyond the softening point of the solid resin. Specifically, in the oil component material while the solid resin is being crushed by rotating the cutter blade 10 in a state where the tank 2 is heated at a predetermined temperature increase rate so that the ultimate temperature is 80 to 200 ° C. Can be dissolved.

  As described above, since the solid resin can be dissolved in the oil component material while being pulverized at a temperature of 200 ° C. or lower, the reduction in the molecular weight of the solid resin due to the transesterification reaction can be suppressed. Therefore, in the manufacturing method of the resin varnish for offset printing ink of this embodiment, the varnish used as the raw material of the composition for offset printing ink which has high printability can be obtained. Moreover, in the manufacturing method of the resin varnish for offset printing ink of this embodiment, since solid resin can be dissolved in an oil component material at the temperature of 200 degrees C or less, a thermal energy loss can be decreased. Moreover, in the manufacturing method of the resin varnish for offset printing ink of this embodiment, since solid resin is melt | dissolved in the oil component material while grind | pulverizing, it can prevent that dust explosion does not occur without dust scattering.

  As described above, the resin varnish for offset printing ink obtained by the method for producing the resin varnish for offset printing ink according to the present embodiment is obtained by dissolving the solid resin in which the low molecular weight is suppressed by the transesterification reaction in the oil component material. It has been done. Therefore, the resin varnish for offset printing ink is a raw material for the composition for offset printing ink having high printability.

  The cutter blade used when stirring and mixing the mixture of the solid resin and the oil component material in the tank 2 is not limited to the shape of the cutter blade 10 described above. The above-described cutter blade 10 is formed so that six blades are connected radially outward from the base portion 11, but the number of blades of the cutter blade is preferably 3 to 10, more preferably 4 to 8 sheets. When the number of blades in the cutter blade is less than 3, sufficient shearing force cannot be applied to the solid resin, and the solid resin cannot be sufficiently pulverized in the oil component material. Further, when the number of blades in the cutter blade is more than 10, the strength of each blade itself cannot be ensured sufficiently.

  Hereinafter, a cutter blade having a different number of blades from the above-described cutter blade 10 will be described with reference to FIGS.

  FIG. 3 is a diagram illustrating a configuration of the cutter blade 20. FIG. 3A shows a development view of the cutter blade 20, and FIG. 3B shows a plan view of the cutter blade 20. The cutter blade 20 is configured similarly to the cutter blade 10 described above except that the number of blades is different.

  The cutter blade 20 includes a base 21, a first blade 22, a second blade 23, and a third blade 24.

  The base portion 21 is a plate-like portion that is fixed vertically to a rotation shaft that is rotationally driven in the rotation direction A around a rotation axis that is collinear with the central axis of the tank 2, and has a shape when viewed in plan. It is a regular octagon. In the cutter blade 20, a total of eight blades including two first blades 22, two second blades 23, and four third blades 24 are equally spaced in the circumferential direction with respect to the rotation axis. The base portion 21 is formed so as to extend radially outward from each side of the regular octagonal base 21. The eight blades 22, 23, 24 are formed in the same shape and size, and in this embodiment, the shape when viewed in plan is a trapezoid.

  Each of the two first blades 22 is a blade that is inclined so as to be separated to one side with respect to the rotation surface of the base portion 21 as it goes radially outward from the base portion 21. The first blades 22 are provided symmetrically with respect to the rotation axis.

  Further, the first blade 22 is bent at a position where the first upstream base end portion 22a on the upstream side in the rotation direction A is separated radially outward from the first downstream base end portion 22b on the downstream side in the rotation direction A. Then, it is connected to the base 21. Further, the first blade 22 is formed such that an edge portion 22c facing the downstream side in the rotational direction A is tapered so as to face the downstream side in the rotational direction A.

Each of the two second blades 23 is inclined in such a manner that the first blade 22 is separated from the rotation surface of the base portion 21 with respect to the rotation surface of the base portion 21 as going radially outward from the base portion 21. And a blade inclined so as to be separated in the opposite direction side (hereinafter referred to as “the other side ”) . The second blades 23 are provided symmetrically with respect to the rotation axis.

  Further, the second blade 23 is bent at a position where the second upstream base end portion 23a on the upstream side in the rotation direction A is separated radially outward from the second downstream base end portion 23b on the downstream side in the rotation direction A. Then, it is connected to the base 21. Further, the second blade 23 has an edge portion 23c that faces the downstream side in the rotation direction A and is tapered toward the downstream side in the rotation direction A.

  Each of the four third blades 24 is a blade that extends radially outward from the base 21 and is parallel to the rotation surface of the base 21. The four third blades 24 are provided in a cross shape. The third blade 24 is formed such that an edge portion 24a that faces the downstream side in the rotation direction A has a tapered shape facing the downstream side in the rotation direction A.

  As described above, a total of eight blades including two first blades 22, two second blades 23, and four third blades 24 are connected radially outward from the base 21. In the formed cutter blade 20, the rotation diameter at the tip of the outermost peripheral edge corresponding to the length between the free ends of the four third blades 24 is 30 to 80 with respect to the inner diameter Y <b> 2 of the tank 2. % Is set.

  FIG. 4 is a diagram illustrating the configuration of the cutter blade 30. FIG. 4A shows a development view of the cutter blade 30, and FIG. 4B shows a plan view of the cutter blade 30. The cutter blade 30 is configured similarly to the cutter blade 10 described above except that the number of blades is different.

  The cutter blade 30 includes a base 31, a first blade 32, and a second blade 33.

  The base 31 is a plate-like portion that is fixed vertically to a rotation shaft that is rotationally driven in the rotation direction A around a rotation axis that is collinear with the central axis of the tank 2, and has a shape when viewed in plan. It is a square. In the cutter blade 30, a total of four blades of two first blades 32 and two second blades 33 are arranged at equal intervals in the circumferential direction with respect to the rotation axis, and each side of the square base portion 31. Is formed so as to continue outward in the radial direction. The four blades 32 and 33 are formed in the same shape and size, and in this embodiment, the shape when viewed in plan is a trapezoid.

  Each of the two first blades 32 is a blade that is inclined so as to be separated to one side with respect to the rotation surface of the base 31 as it goes radially outward from the base 31. The first blades 32 are provided symmetrically with respect to the rotation axis.

  Further, the first blade 32 is bent at a position where the first upstream base end portion 32a on the upstream side in the rotation direction A is separated radially outward from the first downstream base end portion 32b on the downstream side in the rotation direction A. The base 31 is connected. Further, the first blade 32 is formed such that an edge portion 32 c facing the downstream side in the rotation direction A is tapered so as to face the downstream side in the rotation direction A.

Each of the two second blades 33 is inclined in such a manner that the first blade 32 is separated from the rotation surface of the base portion 31 with respect to the rotation surface of the base portion 31 as it goes radially outward from the base portion 31. And a blade inclined so as to be separated in the opposite direction side (hereinafter referred to as “the other side ”) . The second blades 33 are provided symmetrically with respect to the rotation axis.

  Further, the second blade 33 is bent at a position where the second upstream base end portion 33a on the upstream side in the rotation direction A is separated radially outward from the second downstream base end portion 33b on the downstream side in the rotation direction A. The base 31 is connected. Further, the second blade 33 has an edge portion 33 c that faces the downstream side in the rotational direction A and is formed in a tapered shape so as to face the downstream side in the rotational direction A.

  As described above, in the cutter blade 30 formed so that the four blades in total, that is, the two first blades 32 and the two second blades 33 are continuous from the base 31 outward in the radial direction, The rotational diameter at the tip of the outermost peripheral edge corresponding to the length between the free ends of the first blade 32 and the second blade 33 is set to 30 to 80% with respect to the inner diameter Y2 of the tank 2.

(Composition for offset printing ink)
The composition for offset printing ink of this Embodiment contains the resin varnish for offset printing ink obtained by the manufacturing method of the resin varnish for offset printing ink mentioned above. Therefore, the composition for offset printing ink contains a solid resin in which a reduction in molecular weight due to the transesterification reaction is suppressed as a resin component. Therefore, the offset printing ink composition can prevent an increase in ink misting and occurrence of facing set-off during printing, and can maintain high printability.

  The composition for offset printing ink is obtained by adding a pigment to the resin varnish for offset printing ink and further adding the above-described oil component material as necessary.

  As the pigment, a known organic pigment can be used as a pigment of the composition for offset printing ink. For example, phthalocyanine blue, phthalocyanine green, Hansa yellow, permanent red, anthraquinone, perinone, dioxazine, perylene, quinacridone, azo type Examples include metal complexes, methine metal complexes, thioindigo, isoindolinone, selenium blue, and diaminoanthraquinolyl. In the present embodiment, carbon black may be used as a pigment.

  The offset printing ink composition may be added with a pigment dispersant, a leveling aid, a friction resistance improver, an anti-set-off agent, an antioxidant, a nonionic surfactant, and the like.

  The composition for offset printing ink can be produced by a conventionally known production method such as a dry grinding method or a flushing method. For example, a base ink composition for offset printing is prepared by adding a dried pigment, a vegetable oil component, a petroleum solvent, and a pigment dispersant as necessary to a resin varnish for printing ink, and kneading and dispersing them with a bead mill or a three-roll mill. After that, an offset printing ink composition can be obtained by adding a resin varnish for printing ink, a vegetable oil component, a petroleum solvent, and an additive as necessary to adjust to a predetermined viscosity.

  Moreover, the composition for offset printing inks can also be manufactured as follows. That is, a mechanism for adding a water suspension of a pigment (a water-containing cake or a dry pigment to which water is added to a water suspension) to a resin varnish for printing ink, and then performing flasher (kneader) or solvent removal. It is dehydrated until the content of water in the flushed composition is preferably 2% by mass or less. Next, if necessary, a resin ink varnish for printing ink is added to the dehydrated composition and kneaded and dispersed with a bead mill or a three-roll mill to make a base ink composition for offset printing. The composition for offset printing ink can be obtained by adding a resin varnish for printing ink, a vegetable oil component, a petroleum solvent, and an additive to adjust the viscosity to a predetermined level.

(Example)
The present invention will be described in more detail with reference to examples below, but the present invention is not limited to these examples.

<Resin varnish for offset printing ink>
About the resin varnish for offset printing ink, the melt | dissolution state with respect to the oil component material of solid resin, the viscosity, the polystyrene conversion molecular weight, and n-hexane tolerance were evaluated.

[Solution state of solid resin in oil component]
The dissolved state of the solid resin in the oil component material was evaluated by visually observing the resin varnish for offset printing ink. When the solid resin was completely dissolved in the oil component material, “◯” was given, and when the solid resin was not completely dissolved and the undissolved residue was visually confirmed, “X” was given.

[Evaluation of viscosity]
The viscosity of the resin varnish for offset printing ink was measured as follows. That is, 0.5 cc of the sample was kept at 25 ° C. and measured using an E-type viscometer (TVE-20H, manufactured by Toki Sangyo Co., Ltd.) while appropriately adjusting the rotation speed.

[Evaluation of polystyrene equivalent molecular weight]
The measurement of the polystyrene conversion molecular weight of the resin varnish for offset printing ink was performed as follows. That is, 0.05 g of varnish was dissolved in 5 ml of tetrahydrofuran to prepare an analysis sample, and measurement was performed using a GPC analyzer (manufactured by Waters). And the polystyrene conversion molecular weight was calculated | required from the retention time when the peak began to appear. The column mounted on the GPC analyzer was TSKgel G2500HXL, TSKgelGMHXL-L, and TSKgelGMHXL manufactured by Tosoh Corporation.

[Evaluation of n-hexane tolerance]
The n-hexane tolerance of the resin varnish for offset printing ink was evaluated as follows. That is, 5 g of varnish was weighed into a 100 ml beaker, and n-hexane was added dropwise while stirring with a glass rod under a temperature condition of 25 ° C. Since n-hexane is a poor solvent for the varnish, the varnish solution gradually becomes cloudy as the amount of dripping increases. The end point is the time when the varnish solution becomes cloudy to the extent that the letters on the newspaper placed under the beaker can no longer be read. did.

  In addition, in the resin varnish for offset printing ink, it becomes a raw material of the composition for offset printing ink which has high printability, so that the measured value of n-hexane tolerance shows a low value. Specifically, the offset printing ink composition produced using the resin varnish for offset printing ink showing a low measured value of n-hexane tolerance is one in which the occurrence of ink misting is suppressed during printing, The tack value indicates a low value.

Example 1
In a tank having a height of 30 cm and an inner diameter of 20 cm, 43 parts by mass of a rosin-modified phenol resin having a softening point of 165 ° C. as a solid resin, 6 parts by mass of soybean oil and 51 parts by mass of Nisseki AF7 Solvent as an oil component material were charged. . A six-blade cutter blade 10 shown in FIG. 2 having a rotational diameter of 12 cm (60% with respect to the tank inner diameter) was disposed in the tank.

  Then, heating of the tank is started at a temperature increase rate of 8 ° C./min so that the ultimate temperature becomes 200 ° C., and simultaneously with the start of heating, the peripheral speed of the tip portion at the outermost peripheral edge of the blade becomes 10 m / s. The rotation of the cutter blade 10 was started, and the mixture of the solid resin and the oil component material contained in the tank was stirred and mixed.

  In Example 1, the solid resin was completely dissolved in the oil component material in the middle of the temperature rise before reaching the ultimate temperature (200 ° C.). Resin varnish A1 was obtained.

(Example 2)
A brown transparent resin varnish A2 for offset printing ink was obtained in the same manner as in Example 1 except that the tank was heated at a heating rate of 8 ° C / min so that the ultimate temperature was 170 ° C. In Example 2, the solid resin was completely dissolved in the oil component material during the temperature increase before reaching the ultimate temperature (170 ° C.), but stirring and mixing were continued for 60 minutes.

(Example 3)
A brown transparent resin varnish A3 for offset printing ink was obtained in the same manner as in Example 1 except that the tank was heated at a heating rate of 8 ° C / min so that the ultimate temperature was 140 ° C. In Example 3, the solid resin was completely dissolved in the oil component material during the temperature increase before reaching the ultimate temperature (140 ° C.), but stirring and mixing were continued for 60 minutes.

Example 4
A brown transparent resin varnish A4 for offset printing ink was obtained in the same manner as in Example 1 except that the tank was heated at a heating rate of 8 ° C / min so that the ultimate temperature was 100 ° C. In Example 4, the solid resin was not completely dissolved in the oil component material in the middle of the temperature rise before reaching the ultimate temperature (100 ° C.), but the resin was completely mixed by stirring and mixing for 60 minutes. Dissolved.

(Example 5)
The brown transparent resin varnish A5 for offset printing ink was used in the same manner as in Example 4 except that the cutter blade 10 was rotationally driven so that the peripheral speed of the tip at the outermost peripheral edge of the blade was 13 m / s. Got. In Example 5, the solid resin was not completely dissolved in the oil component material in the middle of the temperature rise before reaching the ultimate temperature (100 ° C.), but the resin was completely mixed by stirring and mixing for 60 minutes. Dissolved.

(Example 6)
The brown transparent resin varnish A6 for offset printing ink was used in the same manner as in Example 4 except that the cutter blade 10 was rotationally driven so that the peripheral speed of the tip at the outermost peripheral edge of the blade was 16 m / s. Got. In Example 6, the solid resin was not completely dissolved in the oil component material during the temperature increase before reaching the ultimate temperature (100 ° C.), but the resin was completely mixed by stirring and mixing for 60 minutes. Dissolved.

( Reference Example 1 )
Except that the cutter blade 10 disposed in the tank is replaced with a four-blade cutter blade 30 shown in FIG. 4 having a rotational diameter of 12 cm (60% with respect to the tank inner diameter), the same as in Example 4. A brown transparent resin varnish A7 for offset printing ink was obtained. In Example 7, the solid resin was not completely dissolved in the oil component material in the middle of the temperature rise before reaching the ultimate temperature (100 ° C.), but the resin was completely mixed by stirring and mixing for 60 minutes. Dissolved.

(Example 7 )
Except that the cutter blade 10 disposed in the tank was replaced with the 8-blade cutter blade 20 shown in FIG. 3 having a rotational diameter of 12 cm (60% with respect to the tank inner diameter), the same as in Example 4. A brown transparent resin varnish A8 for offset printing ink was obtained. In Example 7 , the solid resin was not completely dissolved in the oil component material in the middle of the temperature rise before reaching the ultimate temperature (100 ° C.), but the resin was completely mixed by stirring and mixing for 60 minutes. Dissolved.

(Example 8 )
A brown transparent resin varnish A9 for offset printing ink was obtained in the same manner as in Example 1 except that the tank was heated at a heating rate of 8 ° C / min so that the ultimate temperature was 80 ° C. In Example 8 , the solid resin was not completely dissolved in the oil component material in the middle of the temperature rise before reaching the ultimate temperature (80 ° C.), but the resin was completely mixed by stirring and mixing for 60 minutes. Dissolved.

(Example 9 )
A brown transparent resin varnish A10 for offset printing ink was obtained in the same manner as in Example 4 except that a rosin-modified phenol resin having a softening point of 180 ° C. was used as the solid resin. In Example 9 , the solid resin was not completely dissolved in the oil component material during the temperature increase before reaching the ultimate temperature (100 ° C.), but the resin was completely mixed by stirring and mixing for 60 minutes. Dissolved.

(Example 10 )
A brown transparent resin varnish A11 for offset printing ink was obtained in the same manner as in Example 4 except that a rosin-modified phenol resin having a softening point of 150 ° C. was used as the solid resin. In Example 10 , the solid resin was not completely dissolved in the oil component material during the temperature increase before reaching the ultimate temperature (100 ° C.), but the resin was completely mixed by stirring and mixing for 60 minutes. Dissolved.

(Example 11 )
In the same manner as in Example 4 except that the cutter blade 10 disposed in the tank is changed to a blade having a rotation diameter of 7 cm (35% with respect to the tank inner diameter), the brown transparent resin varnish A12 for offset printing ink is used. Got. In Example 11 , the solid resin was not completely dissolved in the oil component material during the temperature increase before reaching the ultimate temperature (100 ° C.), but the resin was completely mixed by stirring and mixing for 60 minutes. Dissolved.

(Example 12 )
In the same manner as in Example 4, except that the cutter blade 10 disposed in the tank is changed to a blade having a rotational diameter of 14 cm (70% with respect to the tank inner diameter), the brown transparent resin varnish A13 for offset printing ink is used. Got. In Example 12 , the solid resin was not completely dissolved in the oil component material during the temperature increase before reaching the ultimate temperature (100 ° C.), but the resin was completely mixed by stirring and mixing for 60 minutes. Dissolved.

(Example 13 )
The tank is changed to a tank having a height of 6 m and an inner diameter of 4 m, and the cutter blade 10 shown in FIG. 1 having a rotation diameter of 152 cm (38% with respect to the tank inner diameter) is disposed in the tank. A brown transparent resin varnish A14 for offset printing ink was obtained in the same manner as in Example 4 except that the cutter blade 10 was rotationally driven so that the peripheral speed of the tip was 19 m / s. In Example 13 , the solid resin was not completely dissolved in the oil component material during the temperature increase before reaching the ultimate temperature (100 ° C.), but the resin was completely mixed by stirring and mixing for 60 minutes. Dissolved.

(Comparative Example 1)
The mixture of the solid resin and the oil component material is agitated in the same manner as in Example 4 except that the cutter blade 10 is rotationally driven so that the peripheral speed of the tip at the outermost peripheral edge of the blade is 7 m / s. Mixed. In Comparative Example 1, the solid resin was not completely dissolved in the oil component material even after stirring and mixing for 60 minutes.

(Comparative Example 2)
A mixture of the solid resin and the oil component material was stirred and mixed in the same manner as in Example 1 except that the tank was heated at a heating rate of 8 ° C./min so that the ultimate temperature was 60 ° C. In Comparative Example 2, the solid resin was not completely dissolved in the oil component material even after stirring and mixing for 60 minutes.

(Comparative Example 3)
The mixture of the solid resin and the oil component material was agitated in the same manner as in Example 4 except that the cutter blade 10 disposed in the tank was changed to a blade having a rotation diameter of 5 cm (25% with respect to the tank inner diameter). Mixed. In Comparative Example 3, the solid resin was not completely dissolved in the oil component material even after 60 minutes of stirring and mixing.

(Comparative Example 4)
A brown transparent resin varnish A19 for offset printing ink was obtained in the same manner as in Example 1 except that the tank was heated at a heating rate of 8 ° C / min so that the ultimate temperature was 250 ° C. In Comparative Example 4, the solid resin was completely dissolved in the oil component material during the temperature increase before reaching the ultimate temperature (250 ° C.), but stirring and mixing were continued for 60 minutes.

(Comparative Example 5)
Solid resin in the same manner as in Example 3 except that the cutter blade 10 disposed in the tank was changed to a conventional cutter blade (disk turbine blade) having a rotational diameter of 12 cm (60% of the tank inner diameter). And the mixture of oil component materials were mixed with stirring. In Comparative Example 5, the solid resin was not completely dissolved in the oil component material even after stirring and mixing for 60 minutes.

Table 1 shows the evaluation results of the resin varnishes for offset printing inks of Examples 1 to 13, Reference Example 1 and Comparative Examples 1 to 5. In addition, “-” in Table 1 indicates that the evaluation is not performed.

As shown in Table 1, the resin varnishes for offset printing inks of Examples 1 to 13 and Reference Example 1 were obtained by completely dissolving the solid resin in the oil component material in a short dissolution time. It is a varnish having a higher viscosity than the resin varnish for printing ink. From this, it can be seen that the resin varnishes for offset printing inks of Examples 1 to 13 and Reference Example 1 are those in which the reduction of the molecular weight of the solid resin by the transesterification reaction is suppressed. On the other hand, since the resin varnish for offset printing ink of Comparative Example 4 was produced at a high temperature of 250 ° C., the molecular weight of the solid resin was lowered due to the transesterification reaction.

And the resin varnish for offset printing ink of Examples 1-13 and Reference Example 1 is a varnish which shows a lower n-hexane tolerance value than the resin varnish for offset printing ink of a comparative example. From this, it can be seen that the resin varnish for offset printing ink of Examples 1 to 13 and Reference Example 1 is a raw material for the composition for offset printing ink having high printability.

<Preparation of composition for offset printing ink>
(Examples 14 to 26, Reference Example 2 and Comparative Example 6)
Using Examples 1 to 13, Resin Varnishes A1 to A14 and A19 for Offset Printing Inks of Reference Example 1 and Comparative Example 4, Examples 14 to 26, Reference Example 2 and A composition for offset printing ink of Comparative Example 6 was prepared.

  Specifically, 29.4 parts by mass of phthalocyanine pigment (Lionol Blue FG-7330K, manufactured by Toyo Ink Co., Ltd.) and soybean oil 5 were added to 65 parts by mass of each of the resin varnishes A1 to A14, A19 for offset printing ink. 6 parts by mass, and after stirring and mixing at 70 ° C. for 30 minutes, the mixture was dispersed by a three-roll mill to obtain a base ink composition for offset printing.

Next, 45 parts by mass of the corresponding resin varnish for each offset printing ink and 5 parts by mass of Nisseki AF7 Solvent are added to 50 parts by mass of each base ink composition for offset printing, and the mixture is stirred and mixed. The compositions for offset printing inks of Examples 14 to 26, Reference Example 2 and Comparative Example 6 were obtained.

<Printability evaluation>
The offset printing ink compositions of Examples 14 to 26, Reference Example 2 and Comparative Example 6 produced as described above were evaluated for misting property, facing set-off property, and on-machine stability.

[Evaluation of misting properties]
The misting property of the offset printing ink composition was evaluated using DIGITAL INKOMETER (manufactured by Toyo Seiki Co., Ltd.) according to JIS K5701 4.2.2. A 2.6 cc sample was weighed and operated at 35 ° C. and 1200 rpm for 3 minutes, and the misting amount at that time was visually evaluated as the amount of ink scattered on a 10 cm × 10 cm sheet laid under the vibration roll. The misting property was evaluated in a thermostatic chamber (temperature: 25 ° C., humidity: 50%). The evaluation criteria for misting properties are as follows.

      ○: Stain due to ink scattered on the paper is hardly observed, which is good.

      (Triangle | delta): The stain | pollution | contamination degree by the ink scattered on the paper is less than the stain | pollution | contamination degree of a predetermined standard sample.

      X: The degree of smearing due to the ink scattered on the paper is equivalent to the degree of smearing of a predetermined standard sample, and the effect of suppressing the occurrence of misting is not seen.

[Evaluation of face-to-face set-off]
Evaluation of the facing set-off property of the composition for offset printing ink was performed as follows. First, 0.1 cc of the sample was developed on paper (aurora coat, 73 g of weight, manufactured by Futaba Paper Co., Ltd.) using an RI color developing machine (used roller: 4-split, manufactured by Meiji Seisakusho). Next, each printed matter immediately after the color development was set on a set tester (AUTO INKSETTING TESTER, manufactured by Toyo Seiki Co., Ltd.), a set test was performed at intervals of 2 minutes, and the amount of ink adhered to the coated paper was visually confirmed. The face-off set-off property was evaluated in a temperature-controlled room (temperature: 25 ° C., humidity: 50%). Moreover, the evaluation criteria of face-to-face set-off property are as follows.

      ○: In a set test at intervals of 2 minutes, ink adhesion to the coated paper is eliminated within 22 minutes from the start of the test.

      (Triangle | delta): In the set test of a 2 minute space | interval, the ink adhesion with respect to a coated paper is eliminated 24 minutes or 26 minutes after a test start.

      X: In the set test at intervals of 2 minutes, the ink adhesion to the coated paper is eliminated after 28 minutes, 30 minutes or 32 minutes from the start of the test.

[Evaluation of on-board stability]
The on-machine stability of the offset printing ink composition was evaluated using DIGITAL INKOMETER (manufactured by Toyo Seiki Co., Ltd.) in accordance with JIS K5701 4.2.2. A 0.2 cc sample was weighed and operated at 35 ° C. and 1200 rpm for 3 minutes, and then the tack value was continuously measured for 0 to 20 minutes to evaluate on-machine stability.

  In addition, in the composition for offset printing ink, it is a composition for offset printing ink which has high printability, so that the measured tack value shows a low value. Specifically, the offset printing ink composition showing a low tack value is one in which the occurrence of a pyring phenomenon during printing is prevented. The piling phenomenon is a phenomenon in which paper fibers are peeled off by ink at the time of printing, and paper dust is deposited on a roller, a printing plate, and a blanket to cause ink transfer failure.

Table 2 shows the evaluation results of the compositions for offset printing inks of Examples 14 to 26, Reference Example 2 and Comparative Example 6.

As shown in Table 2, the compositions for offset printing inks of Examples 14 to 26 and Reference Example 2 are excellent in on-machine stability because the tack value is prevented from becoming too high. Comparative Example 6 The occurrence of misting and face-to-face set-off is prevented compared to the offset printing ink composition.

10, 20, 30 Cutter blades 11, 21, 31 Base 12, 22, 32 First blade 13, 23, 33 Second blade 14, 34 Third blade 12a, 22a, 32a First upstream base end 12b, 22b 32b 1st downstream base end part 12c, 22c, 32c 1st edge part 13a, 23a, 33a 2nd upstream base end part 13b, 23b, 33b 2nd downstream base end part 13c, 23c, 33c 2nd edge Part 14a, 24a 3rd edge part

Claims (5)

A charging step of charging solid resin and oil component material into a tank in which cutter blades are provided in the internal space;
In a state where the tank is heated at a predetermined heating rate so that the ultimate temperature is 80 to 200 ° C., the cutter blade is driven to rotate around the axis of the rotation shaft, and the solid resin is crushed and dissolved in the oil component material And crushing and dissolving step
The cutter blade is
A plate-like base fixed perpendicularly to a rotation axis that is driven to rotate about an axis that is collinear with the center axis of the tank, and a rotation diameter at the tip of the outermost peripheral edge that extends radially outward from the base. Having a blade that is 30-80% of the inner diameter of the tank,
In the pulverization and dissolution step, the peripheral speed of the tip at the outermost peripheral edge of the blade is rotationally driven at a speed of 10 m / s or more,
The blade is
A first blade which is inclined so as to be separated from one side with respect to the rotation surface of the base as it goes radially outward from the base;
As the radial direction outwards from the base portion , the first blade is inclined with respect to the rotation surface of the base portion so as to be separated in the direction opposite to the direction in which the first blade is inclined with respect to the rotation surface of the base portion . Two blades,
A method for producing a resin varnish for offset printing ink, comprising: a third blade extending radially outward from the base and parallel to a rotation surface of the base.   The method for producing a resin varnish for offset printing ink according to claim 1, wherein the solid resin is a rosin-modified phenol resin having a softening point of 130 ° C or higher.   3. The production of a resin varnish for offset printing ink according to claim 1, wherein the amount of the oil component material charged into the tank in the charging step is 100 to 180% by mass of the charged amount of the solid resin. Method.   The first and second blades are bent at a position where the base end portion on the upstream side in the rotational direction is separated radially outward from the base end portion on the downstream side in the rotational direction, and is connected to the base portion. The manufacturing method of the resin varnish for offset printing inks as described in any one of Claims 1-3.   The edge part which faces the said rotation direction downstream of the said 1st, 2nd and 3rd braid | blade is formed in the taper shape which faces the said rotation direction downstream, The one of Claims 1-4 characterized by the above-mentioned. The manufacturing method of the resin varnish for offset printing inks as described in one.

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