KR101660296B1 - Powder toner of laser printer for precise printing and manufacturing method of the same - Google Patents

Abstract

In the present invention, a surface of a ceramic inorganic pigment in powder form having an average particle diameter of 100 nm to 10 占 퐉 is coated with an electrostatic induction material containing an organic compound silane and a polyester, and the organic compound silane is a gamma- 3-glycidoxypropyltrimethoxysilane, GN-octyltriethoxysilane, bis (3-triethoxysilylpropyl) propyltrimethoxysilane, 3- (Methyl ethyl ketoximino) silane, and methyltris (methylethylketoximino) silane, and a process for producing the same. [0002] The present invention relates to a powder toner for a laser printer, According to the present invention, an electrostatic induction material is coated on a ceramic inorganic pigment to provide an electrostatic force necessary for a laser printer, excellent mechanical properties, and high resolution and excellent precision can be realized.

Description

Technical Field [0001] The present invention relates to a powder toner for a laser printer capable of precise printing and a method for manufacturing the powder toner.

The present invention relates to a powder toner for a laser printer and a method of manufacturing the same. More particularly, the present invention relates to a powder toner for a laser printer and a method of manufacturing the same, which can provide electrostatic force necessary for a laser printer by coating a ceramic inorganic pigment with an electrostatic induction material, To a powder toner for a laser printer and a manufacturing method thereof.

Currently, domestic porcelain companies are designing images by transfer method. Most of the currently used porcelain transfer papers are manufactured by the silk screen printing method.

However, the silkscreen printing method has a resolution as low as 150 dpi at the resolution, and the productivity of the product is lowered due to the production of the color silkscreen and the squeezing process. Further, there is a problem that the process is complicated and the accuracy is low.

The transfer method using the silkscreen printing method will inevitably lower the design competitiveness. The complexity of the silk screen process for making ceramics transfer paper is complicated, and many low-resolution ceramics transfer sheets can not be produced due to the many silkscreen processes by spot color and four color separation, and ceramics transfer paper industry declines due to the use of many chemicals in the silk screen process .

In order to solve these problems, it is necessary to develop an inorganic pigment for laser printing to realize diversity of decorative design of ceramics, and to improve the resolution and quality of ceramics transfer paper.

Korean Patent Registration No. 10-1105372

The present invention provides a powder toner for a laser printer capable of providing electrostatic force necessary for a laser printer by coating an electrostatic induction material on a ceramic inorganic pigment and realizing high resolution and excellent precision, and a method for manufacturing the powder toner have.

In the present invention, a surface of a ceramic inorganic pigment in powder form having an average particle diameter of 100 nm to 10 占 퐉 is coated with an electrostatic induction material containing an organic compound silane and a polyester, and the organic compound silane is a gamma- 3-glycidoxypropyltrimethoxysilane, GN-octyltriethoxysilane, bis (3-triethoxysilylpropyl) propyltrimethoxysilane, 3- The present invention provides a powder toner for a laser printer, which comprises at least one silane selected from the group consisting of tetra-sulphide, phenyltris (methylethylketoximino) silane and methyltris (methylethylketoximino) silane.

The organic compound-based silane and the polyester preferably have a weight ratio of 1: 0.01 to 1.

The electrostatic induction material is preferably coated to have a thickness of 0.001 to 10% of the ceramic inorganic pigment diameter.

Wherein the ceramic inorganic pigment is selected from the group consisting of CoAl ₂ O ₄ powder, Mg _{1 - x} Co _x Al ₂ O ₄ (0.1 ≤ _x ≤ ₁ ) powder, Mg _{1 - x} Ni _x Al ₂ O ₄ (0.1 ≤ _x ≤ 1) (0.01? _X? 0.5) powder or a red pigment containing CaSn _1-x Cr _x SiO ₄ (0.01? _X? 0.5) powder or a red pigment containing Zr _{1 - x} Ce _x SiO ₄ ) System powder, Zr _{1 - x} Pr _x SiO ₄ (0.01? _X? 0.5) system powder, Zr _{1 - x} Ta _x SiO ₄ (0.01? _X? 0.5) system powder or a mixture thereof, And a black pigment containing Co (Fe _{1 - x} Cr _x ) ₂ O ₄ (0.01? _X ? 0.5) powder.

The present invention also provides a method for producing a ceramic electroconductive paste, comprising the steps of: preparing a ceramic inorganic pigment in powder form having an average particle size of 100 nm to 10 탆; and adding a static induction material containing organic compound silane and polyester to the organic solvent, Mixing the ceramic inorganic pigment with the electrostatic induction solution to coat a surface of the ceramic inorganic pigment with an electrostatic induction material including an organic compound silane and a polyester; Wherein the organic compound silane is at least one selected from the group consisting of gamma-methacryloxypropyltrimethoxysilane, 3- (N-phenylamino) propyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane (3-triethoxysilylpropyl) tetrasulfide, phenyltris (methylethylketoximino) silane and methyltris (triphenylphosphine) silane, Butyl ethyl Kane ethoxy mino) provides a method for producing a powder for laser printers comprising the at least one silane selected from the group consisting of silane toner.

Preferably, the organic compound-based silane is dissolved in the electrostatic induction solution so that the organic compound-based silane is contained in an amount of 0.1 to 30 wt%, and the polyester solution in which the polyester beads are dissolved in benzene is added to the organic solvent to form the electrostatic induction solution, The organic compound-based silane and the polyester preferably have a weight ratio of 1: 0.01 to 1.

The electrostatic induction material is preferably coated to have a thickness of 0.001 to 10% of the ceramic inorganic pigment diameter.

Wherein the ceramic inorganic pigment is selected from the group consisting of CoAl ₂ O ₄ powder, Mg _{1 - x} Co _x Al ₂ O ₄ (0.1 ≤ _x ≤ ₁ ) powder, Mg _{1 - x} Ni _x Al ₂ O ₄ (0.1 ≤ _x ≤ 1) (0.01? _X? 0.5) powder or a red pigment containing CaSn _1-x Cr _x SiO ₄ (0.01? _X? 0.5) powder or a red pigment containing Zr _{1 - x} Ce _x SiO ₄ ) System powder, Zr _{1 - x} Pr _x SiO ₄ (0.01? _X? 0.5) system powder, Zr _{1 - x} Ta _x SiO ₄ (0.01? _X? 0.5) system powder or a mixture thereof, And a black pigment containing Co (Fe _{1 - x} Cr _x ) ₂ O ₄ (0.01? _X ? 0.5) powder.

According to the present invention, an electrostatic induction material is coated on a ceramic inorganic pigment to provide an electrostatic force necessary for a laser printer, excellent mechanical properties, and high resolution and excellent precision can be realized.

The laser printer to which the powder toner for a laser printer of the present invention is applied can be used for manufacturing a ceramic transfer paper having high resolution and excellent precision.

1 is a view showing a state in which a powder charged by negative charge according to Experimental Example 1 is contained in a chalet.
Fig. 2 is a view showing a state in which a portion of an acrylic plate charged positively according to Experimental Example 1 is covered on a chalet containing a negatively charged powder, and the degree of adhesion of the powder is confirmed.
3 is a graph showing the generation of static electricity according to the concentration of the organic compound-based silane.
4 is a graph showing the generation of static electricity according to the concentration of 3-glycidoxypropyltrimethoxysilane.
5 is a graph showing the generation of static electricity according to the concentration of gamma-methacryloxypropyltrimethoxysilane.
6 is a graph showing the generation of static electricity according to the concentration of GN-octyltriethoxysilane.
7 is a graph showing the generation of static electricity according to the concentration of 3- (N-phenylamino) propyltrimethoxysilane.
8 is a graph showing the generation of static electricity according to the concentration of methyltris (methylethylketoximino) silane.
9 is a graph showing the generation of static electricity by concentration of bis (3-triethoxysilylpropyl) tetrasulfide.
10 is a graph showing the generation of static electricity according to the concentration of phenyltris (methylethylketoximino) silane.
11 is a photograph of the black inorganic pigment used in Experimental Example 2. Fig.
12 is a transmission electron microscope (TEM) photograph showing the inorganic pigment powder before the electrostatic induction material is coated.
13 is a transmission electron microscope (TEM) photograph showing an inorganic pigment powder after coating an electrostatic induction material according to Experimental Example 2. FIG.
14 is an X-ray diffraction (XRD) pattern of an inorganic pigment after coating with an electrostatic induction material according to Experimental Example 2. FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, it should be understood that the following embodiments are provided so that those skilled in the art will be able to fully understand the present invention, and that various modifications may be made without departing from the scope of the present invention. It is not.

A laser printer is a printer that records a print image on a photosensitive drum with a laser beam and transfers the image to a paper. The printer is used to make a character or a picture by a laser beam on a drum responsive to the light, .

A laser printer scans a laser beam on a drum to form an electrostatic image on the drum according to the photosensitive drum. On the drum, a static image corresponding to the pattern to be printed is generated. And transferring it onto paper such as paper and fixing it with heat. Since such a laser printer is generally well known, a detailed description thereof will be omitted here.

The process of printing paper on a laser printer generally consists of 7 steps in the following order: charge-exposure-development-transfer-fixing-cleaning-erasing.

More specifically, the charging roller charges the surface of the organic photoconduction drum to have a constant negative potential (for example, -850 to -750 V DC).

The position at which the image is to be generated on the surface of the OPC drum is exposed to the laser beam and the previous negative potential is lost.

The toner ionized at a negative potential is placed at the position of the exposed latent image on the surface of the OPC drum rotating through the development roller (DR).

The toner particles migrate to the exposed portion due to the difference between the potential of the exposed position (for example, -50 to -40 V DC) and the potential of not exposed (for example, -850 to-750 V DC).

The toner on the OPC drum moves to the paper due to the transfer roller having a strong anode (for example, 500 to 4000 V DC). Toner on the surface of the OPC drum is attracted by the transfer roller and moves over the paper so that the toner image appears on the paper.

The paper forming the image due to the transfer passes between the Heaat roller and the pressure roller, and the toner melts in the form of a wax, and the image is fixed on the paper.

Remove the remaining toner and foreign matter on the OPC drum using a cleaning blade.

The residual potential on the OPC drum is removed by illuminating the surface of the OPC drum with an Erase Lamp.

As for the principle of electrostatic generation, the outermost electrons are separated by friction, peeling, contact, collision, deformation, ion adsorption, etc., and electrons are attached to the other material, One side has a large number of electrons (-).

Such static electricity generation includes contact charging, friction charging, peeling charging, flow charging, ejection charging, and collision charging.

1. Contact War

When different materials are brought into contact with each other, charge transfer is carried out to form an electric double layer on the surface of the contact surface. When the two materials are separated from each other in the state where the electric double layer is formed, static electricity is generated by charge separation.

2. Friction

The object moves to the contact position by the friction and the charge is separated, and static electricity is generated. The triboelectric charge is subjected to a triboelectrification-contact-separation process.

3. Peeling-off

Charge separation occurs when a close object falls, generating static electricity. The peeling electrification generates static electricity larger than the friction electrification. Static electricity may be generated depending on the surface condition (surface corrosion, smoothness) even if the object to which it is attached is the same material.

4. Fluid War

As fluidic powder or liquid flows along the pipe, an electric double layer is formed, and a part of the electric charge is moved by fluidity, so that static electricity is generated. The magnitude of static electricity depends on the speed of movement of powder and liquid.

5. Emergency, collision

As the liquid and the powder move to the narrow opening, static electricity is generated by the friction. In addition to the generation of static electricity by friction, static electricity is generated by collision between powder and liquid.

In the collision, collision between the particle and the particle such as minute retention or collision between the particle and the solid occurs and the static electricity is generated due to the rapid contact and separation.

The present invention discloses a powder toner for a laser printer which can be used for ceramics transfer and the like, and is provided with electrostatic induction material coated on a ceramic inorganic pigment to provide electrostatic force necessary for a laser printer.

In the powder toner for a laser printer according to the preferred embodiment of the present invention, a surface of a ceramic inorganic pigment having an average particle diameter of 100 nm to 10 m is coated with an electrostatic induction material including an organic compound silane and a polyester , The organic compound silane is at least one selected from the group consisting of gamma-methacryloxypropyltrimethoxysilane, 3- (N-phenylamino) propyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, GN-octyltriethoxysilane , At least one silane selected from bis (3-triethoxysilylpropyl) tetrasulfide, phenyltris (methylethylketoximino) silane and methyltris (methylethylketoximino) silane.

A method of producing a powder toner for a laser printer according to a preferred embodiment of the present invention comprises the steps of preparing a powdery ceramic inorganic pigment having an average particle diameter of 100 nm to 10 mu m, Forming an electrostatic induction solution by adding an electrostatic induction material containing an organic compound silane and a polyester on the surface of the ceramic inorganic pigment by mixing the electrostatic induction solution with the ceramic inorganic pigment; And drying the ceramic inorganic pigment coated with the electrostatic induction material, wherein the organic compound silane is at least one selected from the group consisting of gamma-methacryloxypropyltrimethoxysilane, 3- (N-phenylamino) propyl tri Methoxysilane, 3-glycidoxypropyltrimethoxysilane, GN-octyltriethoxysilane, bis (3-triethoxysilylpropyl) tetrasulfate, Id, and phenyl-tris (methyl ethyl Kane ethoxy mino) silane and methyl tris (methyl ethyl Kane ethoxy mino) including one or more silanes selected from silanes.

Hereinafter, a powder toner for a laser printer and a manufacturing method thereof according to a preferred embodiment of the present invention will be described more specifically.

Inorganic pigments are generally opaque and inadequate in concentration compared with organic pigments, and have a disadvantage in that they have poor color sharpness, coloring power and printability compared to organic pigments. However, they are excellent in light resistance and heat resistance, stable in organic solvents, There is an advantage that it is cheap. As such inorganic pigments, oxides such as zinc, copper, iron, lead, chromium and cobalt are known.

The ceramic inorganic pigment is a pigment made of ceramics and may be a pigment having various colors. Among the four primary colors of black (K), cyan (C), magenta (M) and yellow And may be a pigment that expresses at least one selected color.

More specifically, as a ceramic inorganic pigment, CoAl ₂ O ₄ has a spinel structure and is thermally and chemically stable and can be used as an inorganic pigment which emits blue (cyan). As such blue ceramic inorganic pigments, Mg _{1 - x} Co _x Al ₂ O ₄ (0.1? _{X? 1} ) based powder, Mg _{1 - x} Ni _x Al ₂ O ₄ (0.1? _{X? 1} ) based powder, And so on.

Examples of the red (magenta) ceramic inorganic pigment include CaSn _{1 - x} Cr _x SiO ₄ (0.01? _X? 0.5) powder and the like.

Examples of the yellow (yellow) ceramic inorganic pigment include powders of Zr _{1 - x} Ce _x SiO ₄ (0.01 ≦ _x ≦ 0.5), powders of Zr _{1 - x} Pr _x SiO ₄ (0.01 ≦ _x ≦ 0.5), Zr _{1 - x} Ta _x SiO ₄ (0.01? _X? 0.5) powder or a mixture thereof.

Examples of the black (black) ceramic inorganic pigment include Co (Fe _{1 - x} Cr _x ) ₂ O ₄ (0.01? _X ? 0.5) powder and the like.

The ceramic inorganic pigment preferably uses a powdery pigment having an average particle diameter of 100 nm to 10 mu m. If the average particle size of the ceramic inorganic pigment is less than 100 nm, it is difficult to manufacture because of difficulty in manufacturing and it is not economical. If the average particle size of the ceramic inorganic pigment exceeds 10 탆, the surface becomes rough after printing, And it may be difficult to form patterns having excellent precision.

In the present invention, a mixture of an organic compound-based silane and a polyester is used as an electrostatic induction material, and electrostatic induction can be developed by coating the electrostatic induction material on a ceramic inorganic pigment.

In general, silane refers to the generic name of silicon hydride Si _n H _{2n +2} .

SiH ₄ , which is a compound of n = 1, is simply referred to as silane. SiH ₄ is a colorless gas with a characteristic odor, melting point -184.7 ° C, boiling point -112 ° C. It spontaneously ignites in the air. It reacts with an alkali hydroxide solution to generate hydrogen and become alkali silicate. When heated, it decomposes to hydrogen and silicon, and is stable at room temperature.

The compound of n = 2, 3, etc. is called disilane, trisilane and the like.

When the hydrogen atom of SiH ₄ is generically referred to as a hydrocarbon group or the like, the name silane is used. All are spontaneously ignited in the air, but they are stable at room temperature if air is blocked and preserved. It is significantly unstable as compared with the corresponding paraffinic hydrocarbons, and is liable to react with water, an alkali hydroxide solution or the like or to undergo pyrolysis. Normally, when magnesium silicate Mg ₂ Si, which is formed by ignition of a mixture of magnesium powder and silica powder, is decomposed into an acid, a mixture is formed with hydrogen. A derivative in which hydrogen is substituted with an alkyl group, a halogen, a hydroxyl group or the like is prepared.

An organic compound based silane in which a hydrogen atom is substituted with a hydrocarbon group is used as the electrostatic induction material. Examples of the organic compound silane include gamma-methacryloxypropyltrimethoxy silane, 3- (N- 3-Glycidoxypropyltrimethoxy silane, GN-Octyltriethoxy silane, and the like. [0033] The term " 3-phenylaminopropyltrimethoxysilane " , Bis (3-triethoxysilylpropyl) tetrasulfide, phenyl tris (methylethylketoximino) silane, methyltris (methylethylketoximino) silane, ) Methyltris (methylethylketoximino) silane, or a mixture thereof.

In order to impart electrostatic functionality to the ceramic inorganic pigment, an electrostatic induction material is coated. The electrostatic induction material is preferably coated to have a thickness of 0.001 to 10% of the ceramic inorganic pigment diameter. The electrostatic induction material is mixed with the organic solvent to form a static induction solution, and the electrostatic induction solution is mixed with the ceramic inorganic pigment so that the electrostatic induction material is coated on the ceramic inorganic pigment. The electrostatic induction material may be a mixture of an organic compound-based silane and a polyester.

An organic compound-based silane is added to an organic solvent such as ethanol and dissolved, and then a polyester solution is added thereto to form a static induction solution.

The organic compound-based silane does not dissolve well, so it is preferable to add the organic compound-based silane to the organic solvent and stir for a predetermined time or longer (for example, 10 minutes or longer). The stirring is preferably performed at a rotation speed of about 10 to 1,000 rpm. It is preferable that the organic compound-based silane is dissolved in the electrostatic induction solution in an amount of 0.1 to 30% by weight.

Since the polyester is not water-soluble, it is dissolved in a solvent such as benzene and formed into a polyester solution.

An organic compound-based silane and a polyester solution are mixed with a ceramic inorganic pigment by mixing an organic compound-based silane and a polyester solution in an organic solvent, and mixing the ceramic inorganic pigment with an electrostatic induction solution in which the organic compound- .

The organic compound-based silane and the polyester preferably have a weight ratio of 1: 0.01 to 1.

In order to impart the electrostatic function to the ceramic inorganic pigment, after the electrostatic induction material is coated, the ceramic inorganic pigment coated with the electrostatic induction material is dried. The drying is preferably carried out for a time (for example, 10 minutes to 48 hours) in which the solvent component can be sufficiently volatized at a temperature of about 40 to 150 ° C.

After drying, the powder particles may be agglomerated, so that the pulverization process or the sieving process may be performed.

The powder toner for laser printer thus manufactured has a structure in which a ceramic inorganic pigment in powder form having an average particle diameter of 100 nm to 10 占 퐉 is coated with an electrostatic induction material.

The laser printer to which the powder toner for a laser printer of the present invention is applied can be used for manufacturing a ceramic transfer paper having high resolution and excellent precision.

Hereinafter, experimental examples according to the present invention will be specifically shown, and the present invention is not limited by the following experimental examples.

<Experimental Example 1>

Seven organic compound silanes, which induce static electricity, were added to the pigments to induce a negative charge on the toner, and the degree of electrostatic charge was measured.

Ethanol and organic compound-based silane were added to the beaker, and the organic compound-based silane solution in the beaker was stirred for about 10 minutes at 450 rpm using an agar to form a static induction solution. The electrostatic induction solution was prepared by mixing 0.1 wt%, 0.5 wt%, 1.0 wt%, 3 wt%, 5 wt%, 7 wt%, 10 wt%, 20 wt% and 30 wt% Respectively.

Gamma-methacryloxypropyltrimethoxysilane Amount of ethanol added 50g 50g 50g 30g 30g 30g 30g 30g 30g Amount of silane added 0.05 g 0.25 g 0.5 g 0.9 g 1.5 g 2.1 g 3g 6g 9g Silane concentration 0.1 wt% 0.5 wt% 1wt% 3wt% 5 wt% 7wt% 10wt% 20wt% 30wt%

3-glycidoxypropyltrimethoxysilane Amount of ethanol added 50g 50g 50g 30g 30g 30g 30g 30g 30g Amount of silane added 0.05 g 0.25 g 0.5 g 0.9 g 1.5 g 2.1 g 3g 6g 9g Silane concentration 0.1 wt% 0.5 wt% 1wt% 3wt% 5 wt% 7wt% 10wt% 20wt% 30wt%

Methyltris (methylethylketoximino) silane Amount of ethanol added 50g 50g 50g 30g 30g 30g 30g 30g 30g Amount of silane added 0.05 g 0.25 g 0.5 g 0.9 g 1.5 g 2.1 g 3g 6g 9g Silane concentration 0.1 wt% 0.5 wt% 1wt% 3wt% 5 wt% 7wt% 10wt% 20wt% 30wt%

Phenyltris (methylethylketoximino) silane Amount of ethanol added 50g 50g 50g 30g 30g 30g 30g 30g 30g Amount of silane added 0.05 g 0.25 g 0.5 g 0.9 g 1.5 g 2.1 g 3g 6g 9g Silane concentration 0.1 wt% 0.5 wt% 1wt% 3wt% 5 wt% 7wt% 10wt% 20wt% 30wt%

Bis (3-triethoxysilylpropyl) tetrasulfide Amount of ethanol added 50g 50g 50g 30g 30g 30g 30g 30g 30g Amount of silane added 0.05 g 0.25 g 0.5 g 0.9 g 1.5 g 2.1 g 3g 6g 9g Silane concentration 0.1 wt% 0.5 wt% 1wt% 3wt% 5 wt% 7wt% 10wt% 20wt% 30wt%

GN-octyltriethoxysilane Amount of ethanol added 50g 50g 50g 30g 30g 30g 30g 30g 30g Amount of silane added 0.05 g 0.25 g 0.5 g 0.9 g 1.5 g 2.1 g 3g 6g 9g Silane concentration 0.1 wt% 0.5 wt% 1wt% 3wt% 5 wt% 7wt% 10wt% 20wt% 30wt%

3- (N-phenylamino) propyltrimethoxysilane Amount of ethanol added 30g 30g 30g 30g 30g 30g 30g 30g 30g Amount of silane added 0.05 g 0.25 g 0.5 g 0.9 g 1.5 g 2.1 g 3g 6g 9g Silane concentration 0.1 wt% 0.5 wt% 1wt% 3wt% 5 wt% 7wt% 10wt% 20wt% 30wt%

Since the cost of cyan, magenta, yellow and black inorganic pigments is rather high, charge amount of organic compound silane was determined by using powder instead of pigment in the chargeability test. The powder used was a silica powder having an average particle diameter of 1 占 퐉.

The powder was placed in a chalet and 7 g of the electrostatic induction solution was added.

The mixture of powder and electrostatic induction solution was placed in a drier and dried (dryer temperature: 80 ° C) to evaporate the ethanol.

The dried material (powder coated with the organic compound silane) was sieved to 325 mesh, and the positively charged (+) band portion was covered on the chalette containing the powder inside the coated paper, Acrylic plate). More specifically, the dried material (powder coated with the organic compound silane) was dried in a dryer for 15 hours and sieved with 325 mesh. The sieved powder was put in a paper bag, sealed and shaken 40). After charging the negative charge, the negatively charged powder was transferred to a chalet (see Fig. 1). The acrylic plate was rubbed with polyethylene 20 times to charge the acrylic plate positively, and then the positively charged acrylic plate The powder was placed on a chalet containing a negatively charged powder to confirm the degree of powder adhesion (see FIG. 2).

3 is a graph showing the generation of static electricity according to the concentration of the organic compound-based silane. FIG. 4 is a graph showing the generation of static electricity according to the concentration of 3-glycidoxypropyltrimethoxysilane, FIG. 5 is a graph showing the generation of static electricity according to the concentration of gamma-methacryloxypropyltrimethoxysilane, FIG. FIG. 7 is a graph showing the generation of static electricity according to the concentration of 3- (N-phenylamino) propyltrimethoxysilane, and FIG. 8 is a graph showing the generation of static electricity according to the concentration of octyltriethoxysilane, FIG. 9 is a graph showing the generation of static electricity according to the concentration of bis (3-triethoxysilylpropyl) tetrasulfide, and FIG. 10 is a graph showing the generation of static electricity by concentration of phenyltris (methylethylketoxy Mino) silane by the concentration of silane.

3 to 10, the electrostatic force was evaluated qualitatively. As a result, it was found that the powder coated with the electrostatic induction solution containing 7 wt% of 3- (N-phenylamino) propyltrimethoxysilane and the powder coated with phenyltris The electrostatic force was strong in the coating powder coated with the electrostatic induction solution containing 5 wt% of methylethylketoximino) silane.

As a result of comparing the degree of electrostatic generation by the concentration of the electrostatic induction solution, it was found that the powder coated with the electrostatic induction solution containing 3- (N-phenylamino) propyltrimethoxysilane was 3- (N-phenylamino) Static electricity was slightly generated from the silane concentration of 1 wt% or more.

When the concentration (added amount) of the organic compound-based silane is 10 wt% or more, viscous is produced in the powder coated with bis (3-triethoxysilylpropyl) tetrasulfide and 3- (N-phenylamino) propyltrimethoxysilane Respectively. On the other hand, when phenyltris (methylethylketoximino) silane has a concentration of 0.5 wt%, static electricity is slightly generated, and when the phenyltris (methylethylketoximino) silane concentration is 7 wt% or more, the powder tends to stick to the chalet, Is difficult to collect. This phenomenon was also observed in the methyl tris (methyl ethyl ketoximino) silane and GN-octyltriethoxysilane with the powder attached to the chalet from 5 wt% or more.

The electrostatic force was evaluated by coating the electrostatic induction solution obtained by dissolving the organic compound-based silane in ethanol. As a result, it was confirmed that static electricity was somewhat generated between 0.1 to 7 wt% of all the seven kinds of organic compound-based silanes. Among them, strong static electricity was generated at 7 wt% and 5 wt% of the amino-based silane, 3- (N-phenylamino) propyltrimethoxysilane, and the oxy-based silane, phenyltris (methylethylketoximino) silane.

Based on the above results, it is expected that an organic compound-based silane may be coated on an inorganic pigment to be used as a powder toner for a laser printer.

<Experimental Example 2>

Ethanol, organic compound-based silane (3- (N-phenylamino) propyltrimethoxysilane) and polyester solution were added to the beaker in the contents shown in the following Table 8, and the solution in the beaker was stirred for about 10 minutes And stirred at 450 rpm to form a static induction solution. The polyester solution is a solution of polyester beads in benzene.

3- (N-phenylamino) propyltrimethoxysilane ethanol 30g 30g 30g 30g 30g 30g 30g 30g 30g Silane 0.05 g 0.25 g 0.5 g 0.9 g 1.5 g 2.1 g 3g 6g 9g Polyester 0.005 g 0.025 g 0.05 g 0.09 g 0.15 g 0.21 g 0.31 g 0.60g 0.90 g

Black (black) inorganic pigments having the ingredients shown in Table 9 below were prepared. The black inorganic pigment having an average particle diameter of 0.5 mu m was used, and the photograph of the black inorganic pigment used in Fig. 11 was shown.

ingredient (%) Black inorganic pigment SiO ₂ 0.24 Al ₂ O ₃ 0.09 Fe ₂ O ₃ 0.01 CaO 0.05 MgO 0.05 K ₂ O 0.06 Na ₂ O 0.09 TiO ₂ 0.02 MnO 0.04 P ₂ O ₅ 22.10 ZrO ₂ 0.01 CuO 28.60 Cr ₂ O ₃ 48.60 Weight loss 0.04

The black inorganic pigment and the electrostatic induction solution were mixed. For the mixing method, ultrasonic dispersion was mixed for 3 minutes. The viscosity of the slurry containing the electrostatic induction solution and the inorganic pigment was about 20,000 cp.

The electrostatic induction solution mixed with ultrasonic dispersion for 3 minutes was defoamed in a vacuum state. This process is to penetrate the electrostatic induction solution between the inorganic pigment particles. The defoaming was continued for 5 minutes.

After completion of the defoaming, the resultant was dried in an oven at 80 DEG C for 15 hours.

The dried powder was sieved to 325 mesh at a humidity of 30% at the fume hood.

The inorganic pigment powder coated with the electrostatic induction material containing 3- (N-phenylamino) propyltrimethoxysilane and polyester was charged in a paper bag and then positively charged.

And was negatively charged by using vinyl chloride again.

The electrostatic induction-coated inorganic pigment powder, which was negatively charged, was transferred to a glass batt, and then an acrylic plate was placed on an interval of 15 mm to confirm that the inorganic pigment powder adhered to the acrylic plate by electrostatic force.

12 is a transmission electron microscope (TEM) photograph showing the inorganic pigment powder before coating with the electrostatic induction material, and FIG. 13 is a photograph of the transmission electron microscope (TEM) showing the inorganic pigment powder after coating the electrostatic induction material according to Experimental Example 2. FIG. FIG. 14 is an X-ray diffraction (XRD) pattern of an inorganic pigment after coating the electrostatic induction material according to Experimental Example 2. FIG.

The black inorganic pigments before coating the electrostatic inducer and the inorganic pigments after coating the electrostatic inducer showed no color change and no change in the X-ray diffraction pattern.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, This is possible.

Claims (8)

An electrostatic induction material including an organic compound silane and a polyester is coated on the surface of a ceramic inorganic pigment in powder form having an average particle diameter of 100 nm to 10 mu m,
The organic compound-based silane may be at least one selected from the group consisting of gamma-methacryloxypropyltrimethoxysilane, 3- (N-phenylamino) propyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, GN-octyltriethoxysilane, At least one silane selected from bis (3-triethoxysilylpropyl) tetrasulfide, phenyltris (methylethylketoximino) silane and methyltris (methylethylketoximino) silane,
Wherein the organic compound-based silane and the polyester have a weight ratio of 1: 0.01 to 1: 1.
delete The powder toner for a laser printer according to claim 1, wherein the electrostatic induction material is coated to a thickness of 0.001 to 10% of the ceramic inorganic pigment diameter.
The method of claim 1, wherein the ceramic inorganic pigments CoAl ₂ O ₄ based _{powder, Mg 1 - x Co x Al} 2 O 4 (0.1≤x≤1) based _{powder, Mg 1 - x Ni x Al} 2 O 4 (0.1 &Lt; / = x &lt; / = 1) system powder or a mixture thereof,
A red pigment containing CaSn _{1 - x} Cr _x SiO ₄ (0.01? _X? 0.5) based powder,
_{Zr 1 - x Ce x SiO 4} (0.01≤x≤0.5) based _{powder, Zr 1 - x Pr x SiO} 4 (0.01≤x≤0.5) based _{powder, Zr 1 -x Ta x SiO 4} (0.01≤x≤0.5 ) System powder, or a mixture thereof,
Wherein the black pigment is a black pigment containing Co (Fe _{1 - x} Cr _x ) ₂ O ₄ (0.01? _X ? 0.5) powder.
Preparing a ceramic inorganic pigment in powder form having an average particle diameter of 100 nm to 10 占 퐉;
Adding an electrostatic induction material including an organic compound-based silane and a polyester to an organic solvent to form an electrostatic induction solution;
Mixing the ceramic inorganic pigment with the electrostatic induction solution to coat a surface of the ceramic inorganic pigment with an electrostatic induction material including an organic compound silane and a polyester; And
And drying the ceramic inorganic pigment coated with the electrostatic induction material,
The organic compound-based silane may be at least one selected from the group consisting of gamma-methacryloxypropyltrimethoxysilane, 3- (N-phenylamino) propyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, GN-octyltriethoxysilane, At least one silane selected from bis (3-triethoxysilylpropyl) tetrasulfide, phenyltris (methylethylketoximino) silane and methyltris (methylethylketoximino) silane,
The organic compound-based silane is dissolved in the electrostatic induction solution in an amount of 0.1 to 30% by weight,
A polyester solution in which polyester beads are dissolved in benzene is added to the organic solvent to form the electrostatic induction solution,
Wherein the organic compound-based silane and the polyester have a weight ratio of 1: 0.01 to 1.
delete [6] The method of claim 5, wherein the electrostatic induction material is coated to a thickness of 0.001 to 10% of the ceramic inorganic pigment diameter.
The method of claim 5, wherein the ceramic inorganic pigments CoAl ₂ O ₄ based _{powder, Mg 1 - x Co x Al} 2 O 4 (0.1≤x≤1) based _{powder, Mg 1 - x Ni x Al} 2 O 4 (0.1 &Lt; / = x &lt; / = 1) system powder or a mixture thereof,
A red pigment containing CaSn _{1 - x} Cr _x SiO ₄ (0.01? _X? 0.5) based powder,
_{Zr 1 - x Ce x SiO 4} (0.01≤x≤0.5) based _{powder, Zr 1 - x Pr x SiO} 4 (0.01≤x≤0.5) based _{powder, Zr 1 -x Ta x SiO 4} (0.01≤x≤0.5 ) System powder, or a mixture thereof,
Wherein the black pigment is a black pigment containing Co (Fe _{1 - x} Cr _x ) ₂ O ₄ (0.01? _X ? 0.5) powder.

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