KR100364511B1 - The white ink composite for marker-pen and its manufacturing method - Google Patents

Abstract

The present invention relates to a white ink for a marker pen, and improves storage stability by increasing the dispersibility of the white pigment even when the amount of the white pigment is increased, so that the redistribution of the pigment component is easy even during long-term storage, so that the ink can be smoothly spilled. It is an object of the present invention to provide a white ink composition for a marker pen and a method of manufacturing the same. To achieve the above object, the present invention provides a conventional pigment based on titanium dioxide, polyvinyl butyral resin, polyvinylpyrrolidone, Vinyl resin selected from polyvinyl acetate, vinyl acetate acrylic copolymer resin or vinyl chloride vinyl acetate copolymer resin, solvent selected from ethyl alcohol, propyl alcohol, isopropyl alcohol, polyoxyethylene lauryl ether, polyoxyethylene oleethane Additives selected from release agents selected from isooctylstearate, dioctyl adipate A white ink composition for a marker pen composed of zero, containing from 20% to 30% by weight of a pigment with respect to 100% by weight of the total composition, and contains a hectorite-based or bentonite-based additive, a modified urea-based additive, and polyethylene oxide It provides a white ink composition for a marker pen, characterized in that the additive selected from the base additives, fatty acid amide wax-based additives or castor oil-based additives comprises 0.1% to 2.0% by weight of thixotropes additive This can be achieved by

Description

White ink composition for marker pens and its manufacturing method

The present invention relates to a white ink for a marker pen, and more particularly, to improve the storage stability by increasing the dispersibility of the white pigment even when the amount of the white pigment is increased, so that redistribution is facilitated even during long-term storage, so that the ink can be smoothly spilled. A white ink composition for a marker pen and a method of manufacturing the same.

Background Art Conventionally, blackboards used in classrooms, seminar rooms, conference rooms, and offices have black or green surfaces, and in recent years, green blackboards have been used to protect eyesight. It has been described.

However, in the process of writing or erasing letters using chalk on the blackboard, a large amount of chalk powder is generated and the interior is contaminated. Especially, the generated chalk powder easily penetrates into the human body during the breathing process and causes various lung diseases. There was a problem acting as.

Due to the above problems, a colored marker pen used for a white board or the like is known, and the marker pen has an ink solution embedded therein, and the ink solution is absorbed by an absorbent such as a sponge installed on the marker nib inside the marker pen. By letting out the pen through the pen tip to have the function of writing instruments.

In the above, the whiteboard has a white background color, and the marker pen for writing on the writing surface is written using various colors with good wipeability, but in general, when the background color is white, eyes are easily tired due to reflection of light. There was a problem that the learning effect was lowered due to the disability.

In order to solve the above problems, the method of manufacturing white ink for marker pens of Korean Patent Application No. 94-9740 and the black ink composition and its manufacturing method of Japanese Patent Application No. 7-110554 are used as pigments. Titanium oxide is used and isopropyl alcohol and acetone as a vinyl resin, solvent, and polyoxyethylene lauryl ether, polyoxyethylene oleincetyl ether as a releasing agent, and isoctyl stearate and dioctyl adipate as other additives. Disclosed is a technique of manufacturing a white ink which enables writing using the prepared white ink on a green-based writing board by adding a white ink.

In more detail, in the method for preparing a white ink for a marker pen of Korean Patent Application No. 94-9740, 9 to 12 wt% of titanium oxide and 1 to 1.5 wt% of calcium carbonate are mixed and pulverized, and the vinyl resin is 1.5 to 1.8. By weight, 50 to 60% by weight of IPA (isopropyl alcohol) is mixed and heated in a hot bath at 95 to 110 ℃ for about 20 to 30 minutes to produce a mucus stock solution, and then ISO (isooctyl stearate) 8 to 11% by weight, 2.8 to 3.2% by weight of LA3 (polyoxyethylene lauryl ether), 0.8 to 1.2% by weight of EA3 (polyoxyethylene oleincetyl ether) and 10 to 12% by weight of acetone were added and mixed, followed by DOA (dioctyl). Adipate) discloses a technique for producing a white ink for a marker pen by adding and mixing 7 to 8.5% by weight.

In addition, in Japanese Patent No. 2524689, "Black ink composition and manufacturing method," 9 to 12 wt% titanium oxide, 0.9 to 1.2 wt% calcium carbonate, 1.8 to 2.2 wt% vinyl resin, 30 to 40 wt% Isopropyl alcohol, 8-11 wt% isooctylstearate, 2.8- 3.2 wt% polyoxyethylene lauryl ether, 0.8-1.2 wt% polyoxyethylene olecetyl ether, 30-40 wt% ethyl alcohol And 7 to 8.5 weights of dioctyl adipate and the like.

As described above, the white ink composition for marker pens is generally composed only of an organic solvent, a white pigment, a resin, and a release agent, and the dispersion stability of the ink is adjusted only by the solvent composition, the type of resin, or the physical properties of the release agent. Therefore, when long-term storage, pigment particles and resin precipitate out to form a hard cake, which makes it difficult to redistribute it, or even if precipitation does not occur, the pigment particles in the ink are agglomerated and the outflow of ink is poor. Even though no agglomeration or sedimentation occurs, gelation occurs and the viscosity of the ink is increased, resulting in poor outflow of the ink during use.

In addition, the white ink for the marker pen is generally used on a dark blackboard surface, so a large amount of white pigment is required because the dark color of the blackboard surface must be sufficiently concealed, but the white ink manufactured by the above method is a white pigment TiO2. The content of 9 to 12% by weight is too low in the dark blackboard has a problem that the whiteness is too low to obtain the proper whiteness.

Accordingly, there have been attempts to increase the content of white pigment titanium oxide to 20 to 30% by weight in order to obtain a proper whiteness. However, as the content of solids increases, dispersibility decreases and a large amount of precipitate is formed. The situation is not improving the stability.

Accordingly, the present invention is to solve the above-mentioned problems, and even when the amount of white pigment is increased, the dispersibility of the white pigment is increased to improve the storage stability. It is an object of the present invention to provide a white ink composition for a marker pen and a method of manufacturing the same.

In order to achieve the above object, the present invention is selected from conventional pigments based on titanium dioxide, polyvinyl butyral resin, polyvinylpyrrolidone, polyvinylacetate, vinyl acetate acrylic copolymer resin or vinyl chloride vinyl acetate copolymer resin. A solvent selected from vinyl resin, ethyl alcohol, propyl alcohol, isopropyl alcohol, a release agent selected from polyoxyethylene lauryl ether, polyoxyethylene oleincetyl, isooctyl stearate, and dioctyl adipate. A white ink composition for a marker pen composed of an additive, the pigment containing 20 to 30% by weight based on 100% by weight of the total composition, hectorite-based or bentonite-based additives, modified urea-based additives, oxidation Polyethylene based additives, fatty acid amide wax based additives or Harvesters can achieve an additive selected from the oil base additive de thixo marker pens by providing a white ink composition, characterized in that configured to include a trough (thixotropes) additives 0.1% to 2.0% by weight.

In addition, in order to more effectively prepare the white ink composition, the present invention first stirs and dissolves the vinyl resin in a stirrer containing a solvent, and adds 0.1% to 2.0% by weight of a release agent and thixotropy additive to the solution, and then mixes again. Provided is a method for producing a white ink for a marker pen, characterized in that the viscosity is adjusted to 30 mPas to 80 mPas by adding 20 wt% to 30 wt% of the pigment and stirring the dispersion for about 3 hours.

Hereinafter, the white ink composition for a marker pen of the present invention and a manufacturing method thereof will be described in more detail. First, in the present invention, the solvent is dissolved while stirring slowly adding a vinyl resin to a stirrer containing a solvent.

In the above solvent, isopropyl alcohol, ethanol, or various organic solvents that are commonly used may be used, and in particular, it is preferable to select and use a solvent capable of dissolving vinyl resin more effectively, and the amount of the solvent is usually added. Added within.

In the present invention, an isopropyl alcohol solvent and ethanol, which have little odor as an organic solvent and have little toxicity, are used in a mixed manner.

As described above, a vinyl resin is added to improve the coating property of the ink prepared in the stirrer containing the solvent, adhesion with the writing plate surface, dispersion stability of the pigment, viscosity control and erasability of the ink.

In this case, the vinyl resin may be a polyvinylbutiral resin, a polyvinylpyrrolidone, a polyvinylacetate, a vinyl acetate acryl copolymer, or vinyl acetate acetate. Although vinyl copolymer resin can be used, in particular, when polyvinyl butyral resin is used, proper adhesiveness is imparted to the writing surface, and as the solvent is volatilized after writing, a film is formed on the writing surface to erase the handwriting. In the present invention, polyvinyl butyral resin was used in the present invention, and the amount of the polyvinyl butyral resin was added in the range of 2% by weight to 7% by weight in consideration of the dispersibility and storage stability of the pigment.

As described above, vinyl resin is added to the solvent, and then 0.1% to 2.0% by weight of thixotrope additive is added and mixed with a mold release agent and other additives, and 20% to 30% by weight of the pigment is further added and dispersed and stirred for 3 hours. It is adjusted to 30mPas to 80mPas.

At this time, as the mold release agent, polyoxyethylene lauryl ether, polyoxyethylene oleinecetyl ether, and the like, which are commonly used, were added within a conventional addition range.

In particular, in the present invention, the thixotropy additive is added to the other additives, and the thixotropy additive gives thixotropic properties to the ink composition so that the precipitate is weak and has a coarse three-dimensional reversible network structure even when a precipitate is generated. Do it.

Therefore, even if a little shear is added to the precipitate, it is re-dispersed to its original state, so it has excellent long-term stability, and if it is shaken slightly every time, the pigment particles are redispersed by the dispersing metal bearing contained in the marker pen. The spill is like a freshly prepared ink.

In particular, in order to sufficiently express the above effects, the thixotrope additive is added in an amount of 0.1% by weight to 2.0% by weight, and when the addition amount of the thixotrope additive is less than 0.1% by weight, the problem may not occur sufficiently. In addition, when added to exceed 2.0% by weight, the viscosity of the ink is high, the problem that the outflow is not easy occurs.

What can be used as the thixotropy additive may be used by mixing at least one selected from organoclay based thixotrope additives and organic thixotropy additives.

The organoclay-based thixotrope additives include hectorite-based additives and bentonite-based additives, and commercially available hectorite-based additives include Tixogel TE, VP, VZ and Tixogel MPG, RHEOX of SUD CHEMIE. Bentone 27, 38 of the company, Bentonite-based additives are commercially available, Tixogel EZ-200, EPA, KM, MP-50, MP-100, MP-350 and EZ 100 from SUD CHEMIE, Bentone 34 from RHEOX , 52, 57 and 1000, and the THIXOPE series from KYOWA CHEMICAL.

In addition, organic thixotropic additives include modified urea based additives, polyethylene oxide based additives, fatty acid amide wax based additives, and castor oil based additives.

In particular, the modified urea-based additives are commercially available by BYK CHEMIE's BYK-410, polyethylene oxide-based additives are commercially available KUSMOTO CHEMICAL's Disparlon 4200 series and Disparlon 4400 series, RHEOX's MPA 14, 60MS, 300MS Commercially available fatty acid amide wax-based additives include Disparlon 6900 series from KUSMOTO CHEMICAL, Thixatrol TSR and VF series from RHEOX. Thioxcin series from RHEOX, Thiexatrol ST, GST, Rheocin series from SUD CHEMIE, Advitol series, and the like.

In addition, the pigment is used 20 to 30% by weight, in this case can be used as a pigment that can be used conventionally all white pigments such as titanium oxide or calcium carbonate, but in consideration of the whiteness, gloss and dispersibility, the use of titanium oxide It is desirable to.

In particular, in the above, the vinyl resin, the releasing agent and other additives were added to the solvent, and then the pigment was added, but the vinyl resin was added to the solvent, followed by the addition of the pigment to premix and disperse by passing through dynomil or tribonola. You may add a mold release agent and another additive here.

As described above, the vinyl resin, the releasing agent, the other additives and the pigment are added to the solvent, followed by dispersion stirring for about 3 hours to adjust the viscosity to 30 mPas to 80 mPas.

In this case, when the viscosity is less than 30 mPas, the viscosity of the prepared ink is low, so that dispersibility is lowered, and pigment precipitation occurs. When the viscosity is more than 80 mPas, the viscosity of the prepared ink is high, and the outflow of ink is poor. Since the problem of not being able to obtain the white concentration occurs, it is preferable to adjust the viscosity of the white ink to 30 mPas to 80 mPas.

Hereinafter, the present invention will be described in more detail with reference to the following examples, but the present invention is not limited to the following description.

<Examples 1 to 5>

Slowly add 70 g of polybutyral resin in a stirrer containing 400 g of Isopropyl alcohol (31212 ml) and 200 g of ethanol (160 ml), and dissolve and dissolve 150 g of polyoxyethylene lauryl ether as a release agent and thixo As a trough additive, a modified urea-based additive was added and mixed at the ratio shown in Table 1 below, and again, 250 g of titanium oxide having a particle size of 0.3 μm was added thereto to disperse and stir for 3 hours to prepare a white ink for a marker pen. Using the white ink, the viscosity, the outflow condition, the redispersibility, and the storage stability were measured by the following method and are shown in Table 1.

- Viscosity -

Approximately 400 g of ink prepared in a 50 ml beaker was added, and the temperature was adjusted to 25 ° C., and when the viscometer rotating plate was rotated two times at 20 rpm using a Rotor NO.1 with a TOKIMEC.BH type viscometer, the scale was read and the viscosity was read. It was.

-Spill Status-

Marker with NIB with a diameter of 5.0 mm and a porosity of 65% or more. Measure 10m line on a green board and measure the amount of ink consumed by 0.1mg. Then, if the ink consumption is more than 300mg per 10m, It was good and less than that. The specification for the ink consumption of macafen is 300 to 400 mg per 10 m.

-Redispersibility-

Take 10g of ink from the Maca-Pen container with a built-in 8mm steel ball, and store the Maca-Pen with NIB with a diameter of 5.0mm with a porosity of 65% or more and store it at room temperature for 6 months. The acidity was judged.

◎: After shaking the maca pen once or twice, the spilled state is the same as the maca pen first made during writing.

○: Shake the maca pen three to four times, and then spilled state is the same as the first time made when writing.

(Triangle | delta): It shakes 5 to 8 times of maca pen, and the spilled state is the same as the maca pen which was first made at the time of writing.

×: After shaking the maca pen more than 10 times, the spilled state is the same as the maca pen first made at the time of writing.

-Storage stability-

Take a 10g of ink prepared in a built-in macapen container with an 8mm diameter steel ball, assemble it, store it at room temperature for 2 months with the NIB upwards, and then drop the ball when the NIB of the macapen downwards. Storage stability was checked as follows.

(Double-circle): The NIB is directed downward and the ball falls.

(Circle): The ball falls when it shakes once or twice after making NIB face down.

(Triangle | delta): The ball falls when it shakes 3-4 times after making NIB face down.

×: The ball falls when the NIB is turned downward and shaken five times or more.

division Addition amount of modified urea base additive (g) Viscosity Spill Dispersibility Storage stability Example 1 0 40 Good × × Example 2 1.5 45 Good ○ ○ Example 3 10 60 Good ◎ ◎ Example 4 20 75 Good ◎ ◎ Example 5 30 85 Bad ◎ ◎

As shown in Table 1, the amount of the modified urea base additive added in the case of Examples 1 to 5 performed by changing the additive of the modified urea base additive for the purpose of providing thixotropy property of the marker pen ink to improve dispersibility and storage stability. Examples 2 to 4 added within the scope of the present invention can be confirmed that the outflow state, dispersibility and storage stability is very good, but Example 1 is not added to the modified urea base additive is low viscosity state is good It can be confirmed that the dispersibility and storage stability is very bad, especially Example 5 in which the addition amount of the modified urea base additive is added to exceed the range of the present invention is excellent in dispersibility and storage stability, but high viscosity, poor leakage state It can be confirmed through Table 1.

As described above, the present invention improves the storage stability by increasing the dispersibility of the white pigment even when the amount of white pigment is increased, so that the redistribution of the pigment component is easy even during long-term storage, so that the ink can be smoothly spilled. It is a useful invention to provide a white ink composition and a method for producing the same.

Claims (5)

Ordinary pigments based on titanium dioxide, polyvinyl butyral resins, polyvinylpyrrolidone, polyvinylacetate, vinyl acetate acrylic copolymer resins or vinyl resins selected from vinyl chloride vinyl acetate copolymer resins, ethyl alcohol, propyl alcohol, To a white ink composition for a marker pen composed of a solvent selected from isopropyl alcohol, a release agent selected from polyoxyethylene lauryl ether, a polyoxyethylene oleincetyl, and an additive selected from isooctyl stearate and dioctyl adipate. Containing from 20% to 30% by weight of pigment relative to 100% by weight of the total composition, the hectorite based additives or bentonite based additives, modified urea based additives, polyethylene oxide based additives, fatty acid amide wax based Selected from additives or caster oil based additives A thixotropic additive (thixotropes) additives 0.1 marker pens white ink composition, characterized in that configured to include the weight% to 2.0 weight%. delete delete delete delete