KR101214965B1 - PARTICLE EXTERNAL ADDITIVE FOR E-PAPER FOR COMPOSITE SURFACE TREATMENT USING TiO2,SiO2 AND PARTICLE FOR E-PAPER TREATED COMPOSITE SURFACE USING THEREOF - Google Patents

Abstract

The present invention relates to a particle external additive for electronic paper for a composite surface treatment using titanium dioxide and silicon dioxide, comprising: bare particles; A plurality of titanium dioxide particles attached to the bare particles; And a plurality of silicon dioxide particles externally attached to the titanium dioxide particles.
According to the present invention, unlike the prior art, by mixing titanium dioxide and silicon dioxide having an amino group and crying on the particle surface, it is possible to suppress the aggregation between particles and to significantly improve the fluidity, and unlike the conventional external additive, the particle surface Since the voids of the external additives are eliminated, there is an advantage that can maximize the effect of improving the aggregation and fluidity between particles due to the amino group.

Description

Particle additive for electronic paper for composite surface treatment using titanium dioxide and silicon dioxide and particles for composite surface treatment using composite surface -PAPER TREATED COMPOSITE SURFACE USING THEREOF}

The present invention relates to an electronic paper particle external additive for a composite surface treatment using titanium dioxide and silicon dioxide, and to a composite surface treated electronic paper particle using the same. More specifically, unlike the conventional art, By forming the surface in a multi-layer structure using a composite material, it not only prevents agglomeration between particles, but also significantly improves durability and fluidity, and is an electronic paper particle additive for composite surface treatment using titanium dioxide and silicon dioxide. And it relates to a composite surface treated particles for electronic paper using the same.

BACKGROUND ART Conventionally, as an image display device replacing a liquid crystal display device (LCD), electronic paper using techniques such as an electrophoretic method, an electrochromic method, a thermal method, and a two-color particle rotation method has been proposed. These prior arts are considered to be a technology that can be used in an inexpensive image display device because of the advantages of having a wider viewing angle closer to a normal printed matter, a smaller power consumption, and a memory function than LCDs. , Electronic paper and the like are expected.

The dual electronic paper technology uses the rapid movement of microparticles by an electric field to electrostatically move charged particles floating in a certain space to display colors. Therefore, even if the voltage is removed, the image does not disappear because there is no change in the position of the particles, so that the effect as if printed on paper is printed. In other words, it does not emit light by itself, but the visual fatigue is very low, so it is possible to enjoy a comfortable viewing like a real book, and the panel's flexibility is high enough to bend and the thickness can be formed very thin. There is great expectation as a display device technology. In addition, as mentioned, power consumption is extremely low since the displayed image is maintained for a long time unless the panel is reset, thereby making it excellent as a portable display device. In particular, low prices due to simple processes and low cost materials are expected to contribute to the popularization of electronic paper.

Electronic paper techniques generally used include electrophoretic methods for microencapsulating a dispersion consisting of dispersed particles and a colored solution, and disposing the dispersion liquid between opposing substrates to cause particles to move in the liquid; Without using a solution, two or more kinds of particles having different colors and charging characteristics are enclosed between at least one transparent substrate, and an electric field is applied to the particles from an electrode pair consisting of electrodes formed on one or both of the substrates. A collision charging method has been proposed in which an charged particle having a different polarity is moved in a different direction by a Coulomb force to display an image.

Regardless of which type of electrophoresis method or collision charging method is used, a technique for forming a charged particle having a fluidity (hereinafter referred to as a 'fluid particle') should be accompanied. The structure which gives fluidity | liquidity is shown by coating the same external additive.

The flowable particles include an external blending method using a mixer by adding an external additive to a dispersion solvent containing the particles. The flowable particles in this manner, the particles and the external additives are physically bonded, due to the limitation of the durability of the physical bonds, there is a problem that the external components easily fall off.

When the external additives fall easily in this way, the charged particles cannot sufficiently respond to the same applied voltage, and the charge characteristics also change easily, resulting in a problem of deterioration in image quality. In addition, the longer the use time due to the departure of the external additive, there is a problem that the probability of occurrence of aggregation between the particles increases.

In addition, since the physical bonding, due to the electrostatic attraction between the particles and the external additive, there is a problem that the binding between the particles and the external additive is not quantitatively and uniformly.

In addition, in the case of the polymer particles used in the flowable particles, a polymerization method according to emulsion polymerization, dispersion polymerization or suspension polymerization is used. Since the polymer particles thus prepared mostly exhibit lipophilic surface properties, hydrophilic functional groups are formed on the surface. It is difficult to apply a new polymerization method for the introduction of the hydrophilic functional group in order to obtain the polymer particles bound, and unlike most commercial lipophilic polymer particles, very high in order to obtain the polymer particles into which the hydrophilic functional groups are introduced. In addition to the cost, there is a problem in that a cumbersome and inexpensive manufacturing method such as using a surfactant is used.

In addition, the binding problem between the particles and the external additives causes the same problems as described above in the binding of the external additives and the substances added to the external additives.

Therefore, in order to solve various problems such as fluidity, durability and prevention of particle agglomeration of fluidized particles, development of a method of solving such problems by modifying the external additive itself is required.

In addition, by effectively constructing a multi-layered external additive on the surface of the fluid particles, combining them uniformly chemically rather than physically, and adding a multi-layered external additive to optimize the particle structure, Development is required.

The present invention is to solve the above problems, unlike the conventional, by adding a titanium dioxide and silicon dioxide having an amino group and added to the surface of the particle, titanium dioxide and dioxide which can suppress the aggregation between particles and significantly improve the fluidity An object of the present invention is to provide an electronic paper particle additive for a composite surface treatment using silicon and an electronic paper particle treated with the composite surface using the same.

In addition, since titanium dioxide and silicon dioxide are complex and positioned on the particle surface, unlike the conventional external additives, the voids of the external additives are eliminated on the particle surface, thereby maximizing the effect of agglomeration and fluidity improvement between particles due to amino groups. An object of the present invention is to provide an electronic paper particle additive for a composite surface treatment using titanium dioxide and silicon dioxide, and a composite surface treated electronic paper particle using the same.

In addition, by using a combination of titanium dioxide and silicon dioxide, the electronic paper particles for the composite surface treatment using titanium dioxide and silicon dioxide, which can improve the overall particle performance in the electronic paper device due to the external properties of both materials An object of the present invention is to provide additives and particles for composite surface treatment using the same.

In addition, it is a particle structure in which the external additive is distributed without voids on the particle surface, and the original particle color is maximized by the external additive, and the electron for the composite surface treatment using titanium dioxide and silicon dioxide which can improve the contrast ratio in the electronic paper device An object of the present invention is to provide a particle external additive for paper and particles for composite surface treatment using the same.

In addition, by reacting ammonia water with the external additives to impart sufficient charge to the external additives, a strong charge is formed throughout the particles, thereby increasing the fluidity of the particles and significantly reducing the interference between particles. And it is an object of the present invention to provide an electronic paper particles external additive for the composite surface treatment using silicon dioxide and the composite surface-treated electronic paper particles using the same.

In addition, by effectively preparing the external additive through the optimum material and its content, the particle external additive for electronic paper for complex surface treatment using titanium dioxide and silicon dioxide which enables simple and economical chemical bond formation with particles and uses thereof It is an object to provide a composite surface treated particles for electronic paper.

Particle additive for electronic paper for the composite surface treatment using titanium dioxide and silicon dioxide according to the present invention for achieving the above object, characterized in that comprises a titanium dioxide having an amino group and silicon dioxide having an amino group. And at least one of ammonia water or a solvent.

In addition, with respect to 100 parts by weight of titanium dioxide having the amino group, silicon dioxide having the amino group is characterized in that it comprises 50 to 200 parts by weight, with respect to 100 parts by weight of titanium dioxide having the amino group, the ammonia water is 300 to It is characterized by including 1500 parts by weight.

In addition, the solvent comprises 5% to 20% by weight of sodium hyposulfite and 80% to 95% by weight of water, with respect to 100 parts by weight of titanium dioxide having the amino group, the solvent is 1000 to 5000 It is characterized by including a weight part.

Next, the composite surface-treated electronic paper particles according to the present invention, the bare particles; A plurality of titanium dioxide particles attached to the bare particles; And a plurality of silicon dioxide particles externally attached to the titanium dioxide particles.

The titanium dioxide particles are evenly distributed on the surface of the bare particles, wherein the silicon dioxide particles are evenly distributed on the surface of the titanium dioxide particles, do not contact the bare particles, between the titanium dioxide particles It is characterized in that the location.

In addition, the size of the bare particles is characterized in that 5㎛ to 20㎛, the bare particles are characterized in that it comprises a monomer and an ionic monomer.

The monomer is at least one of methyl methacrylate, ethylene terephthalate, styrenesulfonate, vinyl acetate, methyl styrene, acrylic acid, butyl methacrylate, ethyl methacrylate, 2-ethylhexyl acrylate or N-vinyl caprolactam Wherein the ionic monomer is any one of styrene sulfonic acid or [2- (methacryloxy) ethyl] trimethyl ammonium chloride.

In addition, at least one of the titanium dioxide particles or the silicon dioxide particles is characterized in that an amino group is bonded, the size of the titanium dioxide particles and the silicon dioxide particles is characterized in that 0.01 ㎛ to 0.7 ㎛, the bare particles And the titanium dioxide particles and the silicon dioxide particles have the same charge.

According to the particle external additive for electronic paper for the composite surface treatment using titanium dioxide and silicon dioxide of the present invention, and the composite surface treated electronic paper particle using the same, unlike the conventional art, a composite of titanium dioxide and silicon dioxide having an amino group By externally attaching to the particle surface, there is an advantage that can suppress the aggregation between particles and significantly improve the fluidity.

In addition, since titanium dioxide and silicon dioxide are complex and positioned on the particle surface, unlike the conventional external additives, the voids of the external additives are eliminated on the particle surface, thereby maximizing the effect of agglomeration and fluidity improvement between particles due to amino groups. There is an advantage.

In addition, by using a combination of titanium dioxide and silicon dioxide, there is an advantage that can improve the overall particle performance in the electronic paper device due to the external properties of both materials.

In addition, as a particle structure in which the external additive is distributed without voids on the particle surface, the original particle color is maximized due to the external additive, thereby improving the contrast ratio in the electronic paper apparatus.

In addition, by reacting ammonia water with the external additives to give sufficient charge to the external additives, a strong charge is formed throughout the particles, thereby increasing the fluidity of the particles and significantly reducing the interference between particles. have.

In addition, by effectively preparing the external additives through the optimum material and its content, there is an advantage that it is possible to form chemical bonds with the particles simply and economically.

1 is a cross-sectional view showing the particles for the composite surface treatment of the present invention by the present invention

DETAILED DESCRIPTION OF THE INVENTION Hereinafter, a preferred embodiment of the present invention is attached to an electronic paper particle external additive for a composite surface treatment using titanium dioxide and silicon dioxide according to the present invention, and a composite surface treated electronic paper particle using the same. It will be described in detail with reference to. The present invention may be better understood by the following examples, which are for the purpose of illustrating the present invention and are not intended to limit the scope of protection defined by the appended claims.

First, the particle external additive for electronic paper for composite surface treatment using titanium dioxide and silicon dioxide according to the present invention is characterized in that it comprises titanium dioxide having an amino group and silicon dioxide having an amino group.

It is preferable to further contain at least one of aqueous ammonia or a solvent here.

The titanium dioxide having an amino group and the silicon dioxide having an amino group have excellent characteristics of preventing particle aggregation and fluidity due to the bound amino group, and this is due to the chemistry between the particles having amino groups through constant research. It has been found that the aggregation of liver is suppressed and the flow characteristic is increased, and this is applied to the present invention.

In addition, the silicon dioxide having the amino group preferably contains 50 to 200 parts by weight, more preferably 80 to 120 parts by weight, most preferably 100 parts by weight based on 100 parts by weight of titanium dioxide having the amino group. It is effective.

If the amount is less than 50 parts by weight, the content of silicon dioxide particles is less than that of titanium dioxide particles, so that the entire surface of the particles is not covered, and the particle characteristics such as fluidity are significantly reduced. In addition to the economical fall in content, there is a problem that the fluidity is lowered due to the increase in particle size.

In addition, the ammonia water serves to enhance the fluidity of the particles by applying an electric charge to the external additive, the ammonia water preferably contains 300 to 1500 parts by weight based on 100 parts by weight of titanium dioxide having the amino group. More preferably, it is effective to include 600 to 1000 parts by weight. If it is less than 300 parts by weight, it is difficult to give sufficient charge to the external additive, and if it exceeds 1500 parts by weight, economical efficiency is lowered, and there is a problem that charge imbalance between the particles and the external additive occurs.

The solvent preferably comprises 5% to 20% by weight of sodium hyposulfite and 80% to 95% by weight of water, more preferably 15% by weight of sodium hyposulfite and 85% by weight of water. to be. If it is out of the content ratio range, it is difficult to effectively disperse titanium dioxide and silicon dioxide, and there is a problem that the reactivity with ammonia water is also reduced.

Moreover, it is preferable that the said solvent contains 1000-5000 weight part with respect to 100 weight part of titanium dioxide which has the said amino group, More preferably, it is effective to contain 2000-3000 weight part. If the amount is less than 1000 parts by weight, the dispersibility of titanium dioxide and silicon dioxide particles is difficult to be uniformly bonded to the particle surface. If the amount is more than 5000 parts by weight, the titanium dioxide and silicon dioxide particles are diluted to an excessive amount. There is a problem that agglomeration does not occur evenly distributed on the surface.

Next, the manufacturing method of the electronic paper particle additive for composite surface treatment by this invention comprises the method of manufacturing the titanium dioxide which has an amino group, and the method of manufacturing the silicon dioxide which has an amino group. Since the method for producing titanium dioxide having an amino group and the method for producing silicon dioxide having an amino group proceed in the same way, only the method for producing titanium dioxide having an amino group will be described below.

The method for producing an electronic paper particle additive using titanium dioxide according to the present invention is characterized in that it comprises a purification step (S10) and an amino group substitution step (S20).

The purification step (S10) is a step of purifying titanium dioxide by heat treatment at 300 to 500 ℃ for 15 to 30 hours. This is a heat treatment process that effectively removes and purifies moisture and impurities in titanium dioxide without damaging titanium dioxide.

In addition, the heat treatment temperature is preferably 300 to 500 ° C, more preferably 350 to 450 ° C. If the temperature is less than 300 ° C., there is a problem in that the moisture and impurities are not sufficiently purified, and if the temperature exceeds 500 ° C., there is a problem that damage may occur to the titanium dioxide itself.

The heat treatment time is preferably 15 to 30 hours, more preferably 20 to 25 hours. If less than 15 hours, there is a problem that can not be sufficiently refined, if more than 30 hours there is a problem that not only economic efficiency, but also damage to titanium dioxide.

Here, by using titanium dioxide as an external additive of the particles for electronic paper, since titanium dioxide is white, there is an advantage that the contrast ratio with respect to the white particles can be increased, and the bonding with the particles for electronic paper is easy, and the durability is strong. Effective as additives.

Next, the amino group substitution step (S20) is a step of preparing titanium dioxide having an amino group by adding the titanium dioxide to the solvent and reacting. This is a process for remarkably improving the fluidity of particles and preventing agglomeration by providing amino groups to titanium dioxide.

In the amino group substitution step (S20), the solvent does not interfere with the amino group substitution reaction, any solvent may be any help, in the present invention, several times the experiment results, it is most preferable to use toluene.

In addition, the amino group substitution step (S20), preferably comprises a reaction solution preparation step (S21), heating step (S22), ethoxysilane addition step (S23) and stirring step (S24).

First, the reaction solution preparation step (S21) is a step of preparing the reaction solution by adding the titanium dioxide to the solvent, and then dispersed. This is a reaction preparation process in which titanium dioxide is mixed in an optimum amount in a solvent and then dispersed to facilitate the reaction.

In the reaction solution preparation step (S21), the titanium dioxide is preferably added to 20 to 50 parts by weight, more preferably 30 to 40 parts by weight based on 100 parts by weight of the solvent. If the amount of titanium dioxide is less than 20 parts by weight, the amount contained in the solvent is too small, there is a problem that the substitution reactivity of the amino group is inferior, if more than 50 parts by weight of titanium dioxide is not sufficiently dispersed in the solvent it is difficult to effectively react However, there is a problem that a sufficient amino group is hardly given to titanium dioxide.

Next, the heating step (S22) is a step of heating the reaction solution under a nitrogen atmosphere. This is a process for creating an effective reaction environment for amino group substitution by maintaining a constant high temperature under a nitrogen atmosphere.

In the heating step (S22), it is preferable to maintain the temperature of the reaction solution at a temperature of 60 ℃ to 90 ℃, more preferably it is effective to maintain a temperature of 70 ℃ to 80 ℃. If it is less than 60 ℃ there is a problem that the reaction between the nitrogen and the reaction solution is difficult to occur, and if it exceeds 90 ℃ there is a problem that the reaction solution is difficult to maintain the optimum content ratio due to the high temperature.

In addition, the ethoxysilane addition step (S23) is a step of adding (3-aminopropyl) triethoxysilane ((3-aminopropyl) triethoxysilane) to the reaction solution. This is a step of adding a reactant of a substitution reaction to give an amino group to titanium dioxide particles.

In the ethoxysilane addition step (S23), the (3-aminepropyl) triethoxysilane is preferably 20 to 50 parts by weight, and more preferably 30 to 40 parts by weight based on 100 parts by weight of the solvent. effective. If it is less than 20 parts by weight, there is a problem that a sufficient amino group is difficult to be imparted to the titanium dioxide phase, and if it exceeds 50 parts by weight, it is difficult to uniformly distribute an appropriate amount of the amino groups imparted onto the titanium dioxide, rather the fluidity of the particles is lowered. There is a problem.

Finally, the stirring step (S24) is a step of stirring the reaction solution. This is a process of reacting (3-aminepropyl) triethoxysilane with titanium dioxide under a nitrogen atmosphere.

In the stirring step (S24), the reaction solution is preferably stirred for 15 to 30 hours at a temperature of 60 ℃ to 90 ℃, more preferably for 20 to 25 hours at a temperature of 70 ℃ to 80 ℃ Is effective. If the temperature is lower than 70 ° C., the temperature is low, and the reactivity decreases, thereby making it difficult to sufficiently bond the amino group to titanium dioxide. If the temperature exceeds 90 ° C., the reaction rate is increased, but the amino group is uniformly bound to the titanium dioxide. It is difficult to achieve, and there is a problem that the reactants are damaged.

In addition, after the stirring step (S24) is not an essential step, it is preferable to add a drying step (S25).

Drying step (S25) is divided into a step of washing the titanium dioxide having the reaction- terminated amino group with toluene and after washing, the step of sufficiently drying at 15 to 30 ℃ for 24 to 48 hours. First, by washing, by removing the unreacted material, thereby improving the external reactivity to the particles, and serves to facilitate the subsequent particle surface treatment process through the drying process.

Next, as shown in FIG. 1, the composite surface-treated electronic paper particles of the present invention include bare particles 10 and a plurality of titanium dioxide particles 20 externally attached to the bare particles 10. And a plurality of silicon dioxide particles 40 externally attached to the titanium dioxide particles 20.

The bare particles 10 are preferably white particles, which is preferably the same color as the titanium dioxide particles of the present invention. However, the bare particles 10 are not necessarily limited to white particles. It's okay.

In addition, the size of the bare particles 10 is preferably 5㎛ 20㎛, more preferably 7㎛ 10㎛. If the particle size is less than 5 μm, the particle size is small, and the particle driving efficiency of the electronic paper device is lowered. If the particle size exceeds 20 μm, the fluidity of the particle is notably reduced, and the resolution of the electronic paper device is lowered. there is a problem.

The bare particles 10 may be any one of the bare particles for electronic paper, but it is preferable that the most suitable for the present invention comprises a monomer and an ionic monomer. In the method for producing the bare particles, the monomer, the polymerization initiator, and the ionic monomer are added to the solvent, followed by stirring to react the bare particles 10.

Herein, the solvent may be any material that does not interfere with particle synthesis and may help the reaction, but methanol is most preferably used.

In addition, the monomer is methyl methacrylate, ethylene terephthalate, styrene sulfonate, vinyl acetate, methyl styrene, acrylic acid, butyl methacrylate, ethyl methacrylate, 2-ethylhexyl acrylate or N-vinyl caprolactam It is preferable to use at least one, and the above materials may be copolymerized.

The polymerization initiator may use any free radical polymerization initiator capable of triggering an emulsion-free polymerization, but in the present invention, at least one of a peroxide compound or an azo compound is preferable, and the peroxide compound is, in principle, an inorganic peroxide, For example alkyl hydroperoxides, examples being tert-butyl, p-mentyl and cumyl hydroperoxide, and also dialkyl or diaryl peroxides such as di-tert-butyl peroxide or dicumyl peroxide Azo compounds are mainly 2,2'-azobis (isobutylonitrile), 2,2'-azobis (isobutyramidine) hydrochloride (2,2'-azobis (isobutyramidine) hydrochloride) It is most efficient to use 'AIBN') as a polymerization initiator.

In addition, the ionic monomer is preferably either styrene sulfonic acid or [2- (methacryloxy) ethyl] trimethyl ammonium chloride. Here, styrene sulfonic acid serves to impart a negative charge to the bare particles, and [2- (methacryloxy) ethyl] trimethyl ammonium chloride serves to impart a (+) charge to the bare particles. Styrene sulfonic acid or [2- (methacryloxy) ethyl] trimethyl ammonium chloride is very effective in the present invention because it is easy to synthesize particles and can impart an appropriate amount of charge.

In addition, the titanium dioxide particles 20 are preferably evenly distributed on the surface of the bare particles (10). Evenly distributed throughout the bare particles 10 to maximize the effect of the amino group and the performance improvement due to the external additive.

In addition, the silicon dioxide particles 40 are evenly distributed on the surface of the titanium dioxide particles 20, it is preferable not to contact the bare particles 10, it is located between the titanium dioxide particles (20). That is, as shown in Figure 1, due to the structure in which the silicon dioxide particles 40 are effectively bonded to the gap between the titanium dioxide particles 20, by the external additive is distributed without a blank space between the bare particles 10 and the outside, Not only can the effect of the amino group and the performance improvement effect due to external additives be maximized, but the bare particles 10, the titanium dioxide particles 20, and the silicon dioxide particles 40 are all composed of the same color, so that the contrast ratio of the electronic paper device. In addition, there is an advantage that can be significantly increased unlike when added to the conventional external additives.

In addition, at least one of the titanium dioxide particles 20 or the silicon dioxide particles 40 is preferably an amino group bonded. As described above, there is an advantage that the properties in the electronic paper of the particles are remarkably improved by binding an amino group.

In addition, the size of the titanium dioxide particles 20 and the silicon dioxide particles 40 is preferably 0.01㎛ to 0.7㎛, more preferably 0.1㎛ to 0.3㎛. If it is less than 0.01 μm, there is a problem that it is difficult to control the distribution on the particle surface evenly. If it exceeds 0.7 μm, it is excessively large compared to the size of the bare particles 10, and rather, there may be a problem that disturbs particle behavior. In addition, there is a problem of lowering the resolution of the electronic paper apparatus.

In addition, the bare particles 10, the titanium dioxide particles 20, and the silicon dioxide particles 40 are connected to each other by a chemical bond, and in particular, a strong chemical bond 30 is formed between the bare particles 10 and the titanium dioxide particles 20. Is done.

Unlike the related art, as shown above, due to the strong chemical bonding by the chemical reaction between the bare particles 10, the titanium dioxide particles 20, and the silicon dioxide particles 40, the durability is remarkably improved, whereby the bare particles 10 ), The titanium dioxide particles 20 and the silicon dioxide particles 40 may all have the same charge.

That is, they may be all positive charges or all negative charges. Thus, unlike the prior art, even if composed of the same charge, since the durability does not decrease by strong bonding, the same charge can be applied.

Therefore, by configuring the charges of the bare particles 10, the titanium dioxide particles 20 and the silicon dioxide particles 40 in the same way, it is possible to remarkably prevent the agglomeration between the particles for electronic paper and to provide excellent driving characteristics. have.

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. It is clear that the present invention can be suitably modified and applied in the same manner. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

Claims (15)

Titanium dioxide comprising titanium dioxide having an amino group and silicon dioxide having an amino group, and with respect to 100 parts by weight of titanium dioxide having the amino group, the silicon dioxide having the amino group comprises 50 to 200 parts by weight titanium dioxide and Particle external additive for electronic paper for composite surface treatment using silicon dioxide
The method of claim 1,
Particle additive for electronic paper for composite surface treatment using titanium dioxide and silicon dioxide, characterized in that it further comprises at least one of ammonia water or a solvent
delete The method of claim 2,
With respect to 100 parts by weight of titanium dioxide having the amino group, the ammonia water contains 300 to 1500 parts by weight, the particle external additive for electronic paper for the composite surface treatment using titanium dioxide and silicon dioxide
The method of claim 2,
The solvent is an electronic paper particle additive for the composite surface treatment using titanium dioxide and silicon dioxide, characterized in that it comprises 5% to 20% by weight sodium hyposulfite and 80% to 95% by weight of water.
The method of claim 2,
With respect to 100 parts by weight of titanium dioxide having the amino group, the solvent is an external particle for the electronic paper for the composite surface treatment using titanium dioxide and silicon dioxide, characterized in that containing 1000 to 5000 parts by weight
Bare particles;
Titanium dioxide particles having a plurality of amino groups attached to the bare particles; And
Silicon dioxide particles having a plurality of amino groups externally attached to the titanium dioxide particles; wherein the silicon dioxide particles having the amino groups include 50 to 200 parts by weight based on 100 parts by weight of the titanium dioxide particles having the amino groups. Composite surface-treated electronic paper particles, characterized in that
8. The method of claim 7,
The titanium dioxide particles are composite surface-treated electronic paper particles, characterized in that evenly distributed on the surface of the bare particles
9. The method according to claim 7 or 8,
The silicon dioxide particles are evenly distributed on the surface of the titanium dioxide particles, do not contact with the bare particles, the composite surface-treated electronic paper particles, characterized in that located between the titanium dioxide particles
9. The method according to claim 7 or 8,
The size of the bare particles is a composite surface treated electronic paper particles, characterized in that 5㎛ to 20㎛
9. The method according to claim 7 or 8,
The bare particles, the composite surface-treated electronic paper particles, characterized in that comprises a monomer and an ionic monomer
12. The method of claim 11,
The monomer is at least one of methyl methacrylate, ethylene terephthalate, styrene sulfonate, vinyl acetate, methyl styrene, acrylic acid, butyl methacrylate, ethyl methacrylate, 2-ethylhexyl acrylate or N-vinyl caprolactam Wherein the ionic monomer is either styrene sulfonic acid or [2- (methacryloxy) ethyl] trimethyl ammonium chloride.
delete 9. The method according to claim 7 or 8,
The size of the titanium dioxide particles and the silicon dioxide particles is a composite surface treated electronic paper particles, characterized in that 0.01㎛ to 0.7㎛
9. The method according to claim 7 or 8,
The bare particles, the titanium dioxide particles and the silicon dioxide particles are composite surface-treated electronic paper particles, characterized in that the same charge

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