CN102621842B - Application of silicon-titanium composite particles to honeycomb shell-core toner and application method - Google Patents
Application of silicon-titanium composite particles to honeycomb shell-core toner and application method Download PDFInfo
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Abstract
The invention belongs to the technical field of toners, and discloses the application of silicon-titanium composite particles to a honeycomb shell-core toner and an application method. The application method comprises the following steps of: adding silicon dioxide with small particle size into dry basic honeycomb shell-core toner particles, and uniformly mixing and stirring to form a first modified toner; and adding the silicon-titanium composite particles into the first modified toner, and uniformly mixing the silicon-titanium composite particles and the first modified toner with stirring to form a second modified toner. The silicon-titanium composite particles have resistivity which is between the resistivity of silicon dioxide and the resistivity of titanium dioxide, so that the quantity of electricity on the surface of the honeycomb shell-core toner is moderate, and the functions of stabilizing electric charges and further resisting environmental changes are realized; and compared with the titanium dioxide, the silicon-titanium composite particles can form a smaller number of agglomerates with smaller sizes, so that the uniform distribution of the silicon-titanium composite particles on the surface of the honeycomb shell-core toner can be ensured. The application method is convenient to implement, and the environmental stability of the honeycomb shell-core toner can be remarkably improved.
Description
Technical field
The invention belongs to the toner technical field, relate to the silicon-application of titanium composite particles in toner, more specifically, relate to application and the application process of silicon-titanium composite particles in cellular shell nuclear toner.
Background technology
Toner is used in xerox or prints forming electrostatic latent image, its with the height of static electric weight and carried charge distribute and not only can directly affect the toner-particle concentration that forms image, and then affect the quality of output image, and can affect the utilization factor of toner.The variation of toner environment for use (being mainly humidity changes) is the key factor that directly affects the toner electric weight.Therefore, in order to guarantee the stable of output image quality, improve the utilization factor of toner, the environmental stability that strengthens toner is extremely important.In general, the difference of toner average friction carried charge Q/m under high humidity and low humidity condition is less thinks that namely its environmental stability is better.
The Facing material of cellular shell nuclear toner (hereinafter to be referred as shell nuclear toner) is mainly resin, the easy hydroscopicity residue such as the polymer monomer of unavoidable remaining trace, solvent, emulsifying agent in the resin building-up process, and the surface of polyester resin is also with hydrophilic radicals such as great amount of hydroxy group, carboxyls.Above factor all makes shell nuclear toner be subject to environmental change, the especially impact of ambient humidity variation.Owing to easily be combined with aqueous vapor, the type toner triboelectric charge of being with in print procedure is easily revealed, and causes various print quality defectives or the reduction of toner transferring rate etc.
At present the method for common raising toner electric weight stability has: in the toner granulation process, add charge control agent (CCA), charge control resin (CCR), after sneak out and add special external additive etc. in the journey.But because making the method, technique, equipment of toner base particle etc., each producer is not quite similar, select suitable CCA or CCR very difficult, even sometimes find suitable CCA or CCR, but only use CCA and/or CCR also often can not reach desirable effect, need plurality of stable electric charge means to cooperatively interact and just can reach preferably effect.By after sneak out Cheng Tigao toner charge stability method comprise: (1) makes toner have certain frictional electrification level and suitable flowability with the strong silicon dioxide of hydrophobicity separately in toner; (2) use the low titania of resistivity or aluminium oxide as external additive in conjunction with silicon dioxide, thereby improve the electric weight stability of toner.But, behind toner, use separately silicon dioxide to be difficult to realize suitable specific insulation in the mixed step.And when improving electric weight stability with titania and/or aluminium oxide in shell nuclear toner, also normal so that shell nuclear toner carried charge is totally on the low side because the two resistivity is less though it can make shell nuclear toner electric weight stable, the electric weight distribution is wide.During in particular for the polyesters toner, the use amount of adjusting titania and/or aluminium oxide is difficult to reach balance between carried charge level and carried charge stability.In addition, because the primary particle diameter of toner external additive mostly is nano level, and nano titanium oxide very easily forms the larger agglomerate of volume, and when using it in the toner, this agglomerate is difficult to be attached to equably shell nuclear toner surface.
Summary of the invention
The technical problem to be solved in the present invention is, for separately being difficult to realize suitable specific insulation, being difficult between carried charge level and carried charge stability, to reach the problem that balance and titania easily form the larger agglomerate of volume and is difficult to evenly be attached to shell nuclear toner surface when coming the regulating resistance rate with titania and/or aluminium oxide with silicon dioxide in the prior art, provide a kind of silicon-titanium composite particles to examine application and application process in the toner at cellular shell.Silicon-titanium composite particles skin is silicon dioxide, and kernel is titania.Because when being exposed in the air, titanium dioxide is many than the oh group of silicon oxide surface, easier absorption aqueous vapor.Adopt the structure of silicon bag titanium, can reduce the oh group quantity of this microparticle surfaces, reduce degree of water wettability, and then stablize its resistivity.The application of this composite particles can make shell nuclear toner surface have suitable carried charge, improve its environmental stability, and the agglomerate quantity that silicon-titanium composite particles forms is few and volume is little, can evenly be attached to shell nuclear toner surface.
The technical problem to be solved in the present invention is achieved by the following technical programs: the application of silicon-titanium composite particles in cellular shell nuclear toner is provided.
In the application of above-mentioned silicon-titanium composite particles in cellular shell nuclear toner, described silicon-titanium composite particles is the silicon-titanium composite particles of core-shell structure, and wherein said silicon-titanium composite particles is take titania as nuclear, take silicon dioxide as shell.
In the application of above-mentioned silicon-titanium composite particles in cellular shell nuclear toner, the primary particle size of described silicon-titanium composite particles is 6～200nm.
In the application of above-mentioned silicon-titanium composite particles in cellular shell nuclear toner, in described silicon-titanium composite particles, the shared mass percent of described silicon dioxide and described titania is respectively 5-95% and 95-5%.
According to a further aspect in the invention, provide the application process of silicon-titanium composite particles in cellular shell nuclear toner, wherein, said method comprising the steps of:
S1: add small particle diameter silicon dioxide in the cellular shell nuclear toner base particle of drying and stir, form the cellular shell nuclear toner of the first modification;
S2: add described silicon-titanium composite particles in the cellular shell nuclear toner of the first modification of step S1 and stir, form the cellular shell nuclear toner of the second modification.
The small particle diameter silicon dioxide that adds among the step S1 evenly is coated on shell nuclear toner surface and is half embedding state.This step both can strengthen shell nuclear toner flowability, increase carried charge, can so that the exposed aerial surface area of shell nuclear toner is down to minimumly, reduce the chance of its surface residues and contact with air, and then reach the effect of Antagonistic Environment humidity variation again.In addition, outside small particle diameter silicon dioxide, enclose one deck silicon-titanium composite particles, because silicon-titanium composite particles resistivity is moderate, so can play the effect of stabilized zone electric weight and then Antagonistic Environment variation.
In the application process of above-mentioned silicon-titanium composite particles in cellular shell nuclear toner, described method also comprises to the cellular shell of the second modification of step S2 examines adding small particle diameter silicon dioxide and large particle diameter silicon dioxide in the toner, and stir, obtain the cellular shell nuclear toner of finished product modification.Can strengthen resistance to aging and the anti-agglomeration of this toner when large particle diameter silicon dioxide is applied to shell nuclear toner surface, and prevent that small particle diameter silicon dioxide is embedded in the shell nuclear toner fully.
In the application process of above-mentioned silicon-titanium composite particles in cellular shell nuclear toner, the mass fraction of cellular shell nuclear toner, silicon-titanium composite particles, small particle diameter silicon dioxide and large particle diameter silicon dioxide is respectively 100,0.5～2.0,0.1～2.0 and 0.6～3.0 described in the cellular shell nuclear toner of described finished product modification.
In the application process of above-mentioned silicon-titanium composite particles in cellular shell nuclear toner, the equal particle diameter of body of described cellular shell nuclear toner is 5～15 μ m, and the primary particle size of described silicon-titanium composite particles, small particle diameter silicon dioxide and large particle diameter silicon dioxide is respectively 6～200nm, 7～20nm and 30～200nm.
The Facing material of cellular shell nuclear toner is mainly resin, the easy hydroscopicity residue in resin building-up process and the toner granulation process and resin (especially vibrin) surface with hydrophilic radical all can cause shell nuclear toner very responsive to ambient humidity.Stablize charge level if in this type toner, add titania (comprise not the titania of surface modification and the hydrophobicity titania of surface modification), the low-resistivity of titania improves anti-environment, owing to will cause shell nuclear toner electric weight to a certain degree to be revealed.More than the stack meeting of two factors so that the frictional electrification amount of shell nuclear toner under high humidity environment is excessively low, easily cause print defect, perhaps reduce the utilization factor of toner.
Implement silicon of the present invention-titanium composite particles in cellular shell nuclear toner application and can obtain following beneficial effect during application process: because the resistivity of silicon-titanium composite particles is between the resistivity of silicon dioxide and titania, its good resistivity can make shell nuclear toner surface institute carried charge moderate, reduce electric weight and reveal, play the effect of stablizing the electrically charged and then Antagonistic Environment variation of its institute; Not only quantity is few but also volume is little than the formed agglomerate of titania for silicon-titanium composite particles, can guarantee that it is in the even distribution of shell nuclear toner surface.Application process of the present invention is implemented convenient, and can significantly improve the environmental stability of shell nuclear toner.
Embodiment
Below will be further explained in detail and illustrate the present invention by specific embodiment.It should be understood that method as described herein and step etc. only are used for task of explanation, rather than limit the invention.
The present invention relates to application and the application process of silicon-titanium composite particles in cellular shell nuclear toner.Silicon used in the present invention-titanium composite particles is the silicon-titanium composite particles of core-shell structure, and particularly, it is take titania as nuclear, take silicon dioxide as shell, and silicon dioxide is coated on the composite particles that titanium dioxide surface forms this core-shell structure fully.The remarkable advantage of this composite particles is its resistivity between silicon dioxide and titania, can provide good anti-environment to toner, and its flowability is similar to silicon dioxide, can provide to toner and well help fluidity.Specifically selecting primary particle diameter according to the equal particle diameter of body of shell nuclear toner among the present invention is the silicon-titanium composite particles of 6～200nm, and in the silicon that adopts-titanium composite particles, the shared mass percent of silicon dioxide and titania is respectively 5-95% and 95-5%.The metric system Preparation Method of above-mentioned silicon-titanium composite particles is provided in the prior art, has also bought easily the silicon that adopts the metric system Preparation Method to make-titanium composite particles on the market.The preparation of silicon-titanium composite particles is not emphasis of the present invention, so adopts STX-501 (DEGUSSA company) and STX-801 (DEGUSSA company) silicon-titanium composite particles among the present invention, and wherein STX-501 and STX-801 are trade names.Also adopted according to the homemade silicon of the metric system Preparation Method of silicon-titanium composite particles-titanium composite particles simultaneously.The metric system Preparation Method of silicon-titanium composite particles can be with reference to the method for putting down in writing in " titania-silica compound substance preparation research and application thereof " (nanosecond science and technology, the 2nd phase in 2007) literary composition.
In the present invention, for further improving the combination property of shell nuclear toner, such as flowability, electrification by friction, resistance to aging and anti-agglomeration etc., also use small particle diameter silicon dioxide (primary particle diameter be 7～20nm) and large particle diameter silicon dioxide (primary particle diameter is 30～200nm).With regard to small particle diameter silicon dioxide, but the commodity in use trade mark is the silicon dioxide of TS-530 (CABOT company), R812 (DEGUSSA company) and NX90S (DEGUSSA company), more than three kinds be electronegativity silicon dioxide; Also but the commodity in use trade mark is the silicon dioxide of TG-820F (CABOT company), R504 (DEGUSSA company), RA200HS (DEGUSSA company) and NA200Y (DEGUSSA company), more than four kinds be electropositivity silicon dioxide.With regard to large particle diameter silicon dioxide, but the commodity in use trade mark is the silicon dioxide of RY50 (DEGUSSA company), NY50 (DEGUSSA company) and TG-C6020N (CABOT company), more than three kinds be electronegativity silicon dioxide; Also but the commodity in use trade mark is the silicon dioxide of TG-C425 (CABOT company), TG-C321 (CABOT company), TG-C122 (CABOT company), NA50H (DEGUSSA company) and NA50Y (DEGUSSA company), more than five kinds be electropositivity silicon dioxide.
Be understandable that, under the prerequisite that does not deviate from the spirit and scope of the present invention, except silicon dioxide and the silicon-titanium composite particles of the above concrete trade names of enumerating, those skilled in the art also can according to actual needs, select any suitable silicon dioxide and silicon-titanium composite particles.Only more than specify and to be used for task of explanation, the present invention is not consisted of any restriction.
Before the application process of specific explanations silicon-titanium composite particles in cellular shell nuclear toner, at first how simple declaration prepares the cellular shell nuclear of electronegativity involved in the present invention toner, specific as follows:
Nuclear is used the nuclear composition emulsification of the toners such as binder resin, colorant and detackifier form the nuclear emulsion, in the nuclear emulsion, added agglutinant formation nuclear agglutination particle dispersion liquid; Then in nuclear agglutination particle dispersion liquid, add shell has core-shell structure with the resin dispersion emulsion formation that contains the electronegative CCA that rubs agglutination particle dispersion liquid; Continue to add the toner agglutinating particle that agglutinant is combined together to form the agglutination particle with core-shell structure to have cellular core-shell structure; Obtaining the equal particle size of protobiont after the washing drying is the cellular shell nuclear toner base particle of 5-15 μ m.All be applicable to prepare electronegativity toner (especially, the cellular shell nuclear of electronegativity toner) with coker with binder resin, colorant and detackifier.
Below will describe the application process of silicon-titanium composite particles in cellular shell nuclear toner in detail by specific embodiment, and describe the obtainable beneficial effect of enforcement the present invention in detail in conjunction with Comparative Examples.Weigh the environmental stability of the cellular shell nuclear toner of prepared finished product modification by the difference of carried charge under the different humidity condition.The carried charge difference is less, and its environmental stability is higher.
Embodiment 1:
Take by weighing cellular shell nuclear toner base particle (the equal particle diameter of body is 5 μ m) and 0.3g TS-530 (primary particle diameter is 8.4nm) that the cellular shell nuclear of the above-mentioned electronegativity of 100g toner preparation processes prepares, the two is added in the mixer, stir 30s under the 80Hz frequency, obtain the cellular shell nuclear toner of the first modification; Take by weighing 1g silicon-titanium composite particles STX-501 (primary particle diameter be 22nm, silicon dioxide and titania separately shared mass percent be respectively 30% and 70%), it is added in the cellular shell nuclear toner of the first modification in the mixer, stir 120s under the 30Hz frequency, obtain the cellular shell nuclear toner of the second modification; Take by weighing 1gRY50 (primary particle diameter is 40nm) and 0.5g TS-530 (primary particle diameter is 8.4nm), both are added behind the pre-dispersed 30s under the 80Hz frequency in the cellular shell nuclear toner of the second modification, then under the 40Hz frequency, stir 120s, obtain the cellular shell nuclear toner of finished product modification.More than suspend 3min between each whipping step.Further the cellular shell nuclear toner with the finished product modification sieves by 150 order reciprocating sieves, discards the screenings on the sieve, and the toner after sieving is designated as toner A1.
Comparative Examples 1: take by weighing 1g RY50 (primary particle diameter is 40nm) and 0.8g TS-530 (primary particle diameter is 8.4nm), it is added in the mixer, under the 80Hz frequency, stir 30s (pre-dispersed external additive), then take by weighing the cellular shell nuclear toner base particle (the equal particle diameter of body is 5 μ m) that the cellular shell of the above-mentioned electronegativity of 100g nuclear toner preparation processes prepares and add in the mixer, stir together (whipping process: stir 30s under the 80Hz frequency with the external additive of pre-dispersed mistake, then stir 120s under the 30Hz frequency, under the 40Hz frequency, stir 120s at last, more than suspend 3min between each whipping step) obtain the cellular shell nuclear toner of finished product modification.Further the cellular shell nuclear toner with the finished product modification sieves by 150 order reciprocating sieves, discards the screenings on the sieve, and the toner after sieving is designated as toner B1.
Embodiment 2:
Take by weighing cellular shell nuclear toner base particle (the equal particle diameter of body is 5 μ m) and 0.3g TS-530 (primary particle diameter is 8.4nm) that the cellular shell nuclear of the above-mentioned electronegativity of 100g toner preparation processes prepares, the two is added in the mixer, stir 30s under the 80Hz frequency, obtain the cellular shell nuclear toner of the first modification; Take by weighing 1g silicon-titanium composite particles STX-801 (primary particle diameter be 18nm, silicon dioxide and titania separately shared mass percent be respectively 40% and 60%), it is added in the cellular shell nuclear toner of the first modification in the mixer, stir 120s under the 30Hz frequency, obtain the cellular shell nuclear toner of the second modification; Take by weighing 1gRY50 (primary particle diameter is 40nm) and 0.5g TS-530 (primary particle diameter is 8.4nm), both are added behind the pre-dispersed 30s under the 80Hz frequency in the cellular shell nuclear toner of the second modification, then under the 40Hz frequency, stir 120s, obtain the cellular shell nuclear toner of finished product modification.More than suspend 3min between each whipping step.Further the cellular shell nuclear toner with the finished product modification sieves by 150 order reciprocating sieves, discards the screenings on the sieve, and the toner after sieving is designated as toner A2.
Comparative Examples 2: with Comparative Examples 1, the cellular shell nuclear toner of the finished product modification that makes in this Comparative Examples is designated as toner B2.
Embodiment 3:
Take by weighing cellular shell nuclear toner (the equal particle diameter of body is 10 μ m) and 0.5g R812 (primary particle diameter is 7nm) that the cellular shell nuclear of the above-mentioned electronegativity of 100g toner preparation processes prepares, the two is added in the mixer, stir 30s under the 80Hz frequency, obtain the cellular shell nuclear toner of the first modification; Take by weighing 2.0g silicon-titanium composite particles STX-501 (primary particle diameter be 22nm, silicon dioxide and titania separately shared mass percent be respectively 30% and 70%), it is added in the cellular shell nuclear toner of the first modification in the mixer, stir 120s under the 30Hz frequency, obtain the cellular shell nuclear toner of the second modification; Take by weighing 0.6gTG-C6020N (primary particle diameter is 200nm) and 1.5g R812 (primary particle diameter is 7nm), both are added behind the pre-dispersed 30s under the 80Hz frequency in the cellular shell nuclear toner of the second modification, then under the 40Hz frequency, stir 120s, obtain the cellular shell nuclear toner of finished product modification.More than suspend 3min between each whipping step.Further the cellular shell nuclear toner with the finished product modification sieves by 150 order reciprocating sieves, discards the screenings on the sieve, obtains required toner.
Embodiment 4:
Take by weighing cellular shell nuclear toner (the equal particle diameter of body is 15 μ m) and 0.05g NX90S (primary particle diameter is 20nm) that the cellular shell nuclear of the above-mentioned electronegativity of 100g toner preparation processes prepares, the two is added in the mixer, stir 30s under the 80Hz frequency, obtain the cellular shell nuclear toner of the first modification; Take by weighing 1.5g silicon-titanium composite particles STX-801 (primary particle diameter be 18nm, silicon dioxide and titania separately shared mass percent be respectively 40% and 60%), it is added in the cellular shell nuclear toner of the first modification in the mixer, stir 120s under the 30Hz frequency, obtain the cellular shell nuclear toner of the second modification; Take by weighing 3.0g NY50 (primary particle diameter is 30nm) and 0.05g NX90S (primary particle diameter is 20nm), it is added in the cellular shell nuclear toner of the second modification, then under the 40Hz frequency, stir this potpourri 120s, obtain the cellular shell nuclear toner of finished product modification.More than suspend 3min between each whipping step.Further the cellular shell nuclear toner with the finished product modification sieves by 150 order reciprocating sieves, discards the screenings on the sieve, obtains required toner.
Embodiment 5:
Take by weighing cellular shell nuclear toner (the equal particle diameter of body is 5 μ m) and 0.3g TS-530 (primary particle diameter is 8.4nm) that the cellular shell nuclear of the above-mentioned electronegativity of 100g toner preparation processes prepares, the two is added in the mixer, stir 30s under the 80Hz frequency, obtain the cellular shell nuclear toner of the first modification; Take by weighing 0.5g silicon-titanium composite particles STX-801 (primary particle diameter be 18nm, silicon dioxide and titania separately shared mass percent be respectively 40% and 60%), it is added in the cellular shell nuclear toner of the first modification in the mixer, stir 120s under the 30Hz frequency, obtain the cellular shell nuclear toner of the second modification; Take by weighing 1.3g RY50 (primary particle diameter is 40nm) and 0.5g TS-530 (primary particle diameter is 8.4nm), both are added behind the pre-dispersed 30s under the 80Hz frequency in the cellular shell nuclear toner of the second modification, then under the 40Hz frequency, stir this potpourri 120s, obtain the cellular shell nuclear toner of finished product modification.More than suspend 3min between each whipping step.Further the cellular shell nuclear toner with the finished product modification sieves by 150 order reciprocating sieves, discards the screenings on the sieve, obtains required toner.
Embodiment 6:
Take by weighing cellular shell nuclear toner (the equal particle diameter of body is 15 μ m) and 0.1g NX90S (primary particle diameter is 20nm) that the cellular shell nuclear of the above-mentioned electronegativity of 100g toner preparation processes prepares, the two is added in the mixer, stir 30s under the 80Hz frequency, obtain the cellular shell nuclear toner of the first modification; Take by weighing the homemade silicon of 1.5g-titanium composite particles (primary particle diameter be 6nm, silicon dioxide and titania separately shared mass percent be respectively 95% and 5%), it is added in the cellular shell nuclear toner of the first modification in the mixer, stir 120s under the 30Hz frequency, obtain the cellular shell nuclear toner of the second modification; Take by weighing 3.0g NY50 (primary particle diameter is 30nm), it is added in the cellular shell nuclear toner of the second modification, then under the 40Hz frequency, stir this potpourri 120s, obtain the cellular shell nuclear toner of finished product modification.More than suspend 3min between each whipping step.Further the cellular shell nuclear toner with the finished product modification sieves by 150 order reciprocating sieves, discards the screenings on the sieve, obtains required toner.
Embodiment 7:
Take by weighing cellular shell nuclear toner (the equal particle diameter of body is 10 μ m) and 0.5g R812 (primary particle diameter is 7nm) that the cellular shell nuclear of the above-mentioned electronegativity of 100g toner preparation processes prepares, the two is added in the mixer, stir 30s under the 80Hz frequency, obtain the cellular shell nuclear toner of the first modification; Take by weighing the homemade silicon of 2.0g-titanium composite particles (primary particle diameter be 200nm, silicon dioxide and titania separately shared mass percent be respectively 5% and 95%), it is added in the cellular shell nuclear toner of the first modification in the mixer, stir 120s under the 30Hz frequency, obtain the cellular shell nuclear toner of the second modification; Take by weighing 0.6gTG-C6020N (primary particle diameter is 200nm) and 1.5g R812 (primary particle diameter is 7nm), both are added behind the pre-dispersed 30s under the 80Hz frequency in the cellular shell nuclear toner of the second modification, then under the 40Hz frequency, stir 120s, obtain the cellular shell nuclear toner of finished product modification.More than suspend 3min between each whipping step.Further the cellular shell nuclear toner with the finished product modification sieves by 150 order reciprocating sieves, discards the screenings on the sieve, obtains required toner.
It is above that concrete application in cellular shell nuclear toner is described to silicon-titanium composite particles in conjunction with TS-530, R812, NX90S, NY50, TG-C6020N and RY50 electronegativity silicon dioxide, but it should be understood that, the present invention also can be according to the needs of the cellular shell nuclear toner of practical application (for example, the cellular shell nuclear of electropositivity toner), use the electropositivity silicon dioxide of other types.Below enumerate the specific embodiment of several silicon-titanium composite particles in the cellular shell nuclear of electropositivity toner.
The cellular shell nuclear of electropositivity toner adopts following methods to prepare:
The nuclear composition emulsification of the toners such as nuclear binder resin, colorant, detackifier is formed the nuclear emulsion, in the nuclear emulsion, add agglutinant formation nuclear agglutination particle dispersion liquid; Then in nuclear agglutination particle dispersion liquid, add shell has core-shell structure with the resin dispersion emulsion formation that contains friction positively charged CCA agglutination particle dispersion liquid; Continue to add the toner agglutinating particle that agglutinant is combined together to form the agglutination particle with core-shell structure to have cellular core-shell structure; Obtaining the equal particle size of protobiont after the washing drying is the cellular shell nuclear toner base particle of 5-15 μ m.All be applicable to prepare electropositivity toner (especially, the cellular shell nuclear of electropositivity toner) with coker with binder resin, colorant and detackifier.
Embodiment 8:
Take by weighing cellular shell nuclear toner (the equal particle diameter of body is 5 μ m) and 0.3g TG-820F (primary particle diameter is 8.4nm) that the cellular shell nuclear of the above-mentioned electropositivity of 100g toner preparation processes prepares, the two is added in the mixer, stir 30s under the 80Hz frequency, obtain the cellular shell nuclear toner of the first modification; Take by weighing 0.5g silicon-titanium composite particles STX-801 (primary particle diameter be 18nm, silicon dioxide and titania separately shared mass percent be respectively 40% and 60%), it is added in the cellular shell nuclear toner of the first modification in the mixer, stir 120s under the 30Hz frequency, obtain the cellular shell nuclear toner of the second modification; Take by weighing 1.3g TG-C122 (primary particle diameter is 110nm) and 0.5g TG-820F (primary particle diameter is 8.4nm), both are added behind the pre-dispersed 30s under the 80Hz frequency in the cellular shell nuclear toner of the second modification, then under the 40Hz frequency, stir this potpourri 120s, obtain the cellular shell nuclear toner of finished product modification.More than suspend 3min between each whipping step.Further the cellular shell nuclear toner with the finished product modification sieves by 150 order reciprocating sieves, discards the screenings on the sieve, obtains required toner, is designated as A3.
Comparative Examples 3: take by weighing 1g TG-C122 (primary particle diameter is 110nm) and 0.8g TG-820F (primary particle diameter is 8.4nm), it is added in the mixer, under the 80Hz frequency, stir 30s (pre-dispersed external additive), then take by weighing the cellular shell nuclear toner base particle (the equal particle diameter of body is 5 μ m) that the cellular shell of the above-mentioned electropositivity of 100g nuclear toner preparation processes prepares and add in the mixer, stir together (whipping process: stir 30s under the 80Hz frequency with the external additive of pre-dispersed mistake, then stir 120s under the 30Hz frequency, under the 40Hz frequency, stir 120s at last, more than suspend 3min between each whipping step) obtain the cellular shell nuclear toner of finished product modification.Further the cellular shell nuclear toner with the finished product modification sieves by 150 order reciprocating sieves, discards the screenings on the sieve, and the toner after sieving is designated as toner B3.
Performance test:
Carried charge test: choose hot and humid (27 ℃, RH80%) and two kinds of environmental baselines of low temperature and low humidity (16 ℃, RH30%), more than on the VERTEX electricity meter, carry out respectively the carried charge of the cellular shell nuclear toner of surface modification under two kinds of environmental baselines among test implementation example 1-2 and the Comparative Examples 1-2, calculate the difference (taking absolute value) of carried charge under two kinds of environmental baselines, the mean value of 6 tests is got in parallel survey 6 times.Concrete outcome is referring to table 1.
Carried charge (Q/m) test result of the cellular shell nuclear toner of surface modification among table 1 embodiment 1-2 and the Comparative Examples 1-2
| Embodiment 1 | Comparative Examples 1 | Embodiment 2 | Comparative Examples 2 | Embodiment 8 | Comparative Examples 3 | |
| Hot and humid | -13.5 | -15.1 | -9.8 | -13.5 | +16.8 | +18.5 |
| Low temperature and low humidity | -24.6 | -34.3 | -20.4 | -29.2 | +23.7 | +30.9 |
| Carried charge difference (μ C/g) | 11.1 | 19.2 | 10.6 | 16.3 | 6.9 | 11.4 |
As seen from the above table, among the embodiment 1 toner A1 respectively the difference of the charged value under two kinds of environment less than Comparative Examples 1 in toner B1 respectively the charged value under two kinds of environment poor ("+" "-" only represents charge polarity in this table, do not represent " just " " bear " number, difference is got its absolute value, so difference is all for just); Among the embodiment 2 toner A2 respectively the difference of the charged value under two kinds of environment less than Comparative Examples 2 in the toner B2 charged value under two kinds of environment poor respectively; Among the embodiment 8 toner A3 respectively the difference of the charged value under two kinds of environment less than Comparative Examples 3 in the toner B3 charged value under two kinds of environment poor respectively.Being understandable that the difference of toner carried charge under high humidity and low humidity condition is less, illustrating that it is subjected to the impact of ambient humidity less, also is that its environmental stability is better.Therefore, compare with 2 with Comparative Examples 1, the environmental stability of the cellular shell nuclear toner of prepared surface modification is better among the embodiment 1 and 2.
As mentioned above, small particle diameter silicon dioxide can partly embed shell nuclear toner under the beating action of mixer.It is minimum that it can make the exposed aerial surface area of toner be down to, the effectively variation of Antagonistic Environment humidity.More importantly, the priority effect of small particle diameter silicon dioxide and silicon-titanium composite particles and shell nuclear toner has cooperative effect, and both actings in conjunction can significantly improve the environmental stability of toner.Above embodiment is advantageous applications example of the present invention.
In sum, when silicon-titanium composite particles was applied to cellular shell nuclear toner, the good specific electrical resistance of silicon-titanium composite particles can make shell nuclear toner surface institute carried charge moderate, plays the effect that stable charging and then Antagonistic Environment change; Not only quantity is few but also volume is little than the formed agglomerate of titania for silicon-titanium composite particles, can guarantee that it is in the even distribution of shell nuclear toner surface.Application process of the present invention is implemented convenient, and can significantly improve the environmental stability of shell nuclear toner.
Claims (8)
1. the application of silicon-titanium composite particles in cellular shell nuclear toner, it is characterized in that, described cellular shell nuclear toner surface has the half small particle diameter silicon dioxide that embeds, described silicon-titanium composite particles is attached to outside the half described small particle diameter silicon dioxide that embeds, and the primary particle size of described small particle diameter silicon dioxide is 7～20nm.
2. the application of silicon according to claim 1-titanium composite particles in cellular shell nuclear toner, it is characterized in that, described silicon-titanium composite particles is the silicon-titanium composite particles of core-shell structure, and wherein said silicon-titanium composite particles is take titania as nuclear, take silicon dioxide as shell.
3. the application of silicon according to claim 1 and 2-titanium composite particles in cellular shell nuclear toner is characterized in that the primary particle size of described silicon-titanium composite particles is 6～200nm.
4. the application of silicon according to claim 2-titanium composite particles in cellular shell nuclear toner is characterized in that in described silicon-titanium composite particles, the shared mass percent of described silicon dioxide and described titania is respectively 5-95% and 95-5%.
5. the application process of silicon-titanium composite particles in cellular shell nuclear toner is characterized in that, said method comprising the steps of:
S1: add small particle diameter silicon dioxide in the cellular shell nuclear toner base particle of drying and stir, form the cellular shell nuclear toner of the first modification;
S2: add described silicon-titanium composite particles in the cellular shell nuclear toner of the first modification of step S1 and stir, make described silicon-titanium composite particles be attached to the outer cellular shell nuclear toner that forms the second modification of described small particle diameter silicon dioxide, the primary particle size of described small particle diameter silicon dioxide is 7～20nm.
6. the application process of silicon according to claim 5-titanium composite particles in cellular shell nuclear toner, it is characterized in that, described method also comprises to the cellular shell of the second modification of step S2 examines adding small particle diameter silicon dioxide and large particle diameter silicon dioxide in the toner, and stir, obtain the cellular shell nuclear toner of finished product modification, the primary particle size of described large particle diameter silicon dioxide is 30～200nm.
7. the application process of silicon according to claim 6-titanium composite particles in cellular shell nuclear toner, it is characterized in that the mass fraction of cellular shell nuclear toner base particle, silicon-titanium composite particles, small particle diameter silicon dioxide and large particle diameter silicon dioxide is respectively 100,0.5～2.0,0.1～2.0 and 0.6～3.0 described in the cellular shell nuclear toner of described finished product modification.
8. the application process of silicon according to claim 6-titanium composite particles in cellular shell nuclear toner, it is characterized in that, the equal particle diameter of body of described cellular shell nuclear toner base particle is 5～15 μ m, and the primary particle size of described silicon-titanium composite particles is 6～200nm.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002182424A (en) * | 2000-12-18 | 2002-06-26 | Nippon Zeon Co Ltd | Toner for developing electrostatic latent image |
| CN1407029A (en) * | 2001-08-27 | 2003-04-02 | 上海大学 | Preparation of nano-silicon/titanium composite particles |
| CN1456942A (en) * | 2001-12-14 | 2003-11-19 | 株式会社理光 | Electronic camera toner, its external additive, electronic camera developer and imaging apparatus |
| CN101625532A (en) * | 2008-07-09 | 2010-01-13 | 株式会社理光 | Image forming method, image forming apparatus and process cartridge |
| CN101950133A (en) * | 2010-08-31 | 2011-01-19 | 珠海思美亚碳粉有限公司 | Toner and method for preparing same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5526556B2 (en) * | 2008-02-28 | 2014-06-18 | 株式会社リコー | Toner, developer, process cartridge, image forming apparatus, and image forming method |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002182424A (en) * | 2000-12-18 | 2002-06-26 | Nippon Zeon Co Ltd | Toner for developing electrostatic latent image |
| CN1407029A (en) * | 2001-08-27 | 2003-04-02 | 上海大学 | Preparation of nano-silicon/titanium composite particles |
| CN1456942A (en) * | 2001-12-14 | 2003-11-19 | 株式会社理光 | Electronic camera toner, its external additive, electronic camera developer and imaging apparatus |
| CN101625532A (en) * | 2008-07-09 | 2010-01-13 | 株式会社理光 | Image forming method, image forming apparatus and process cartridge |
| CN101950133A (en) * | 2010-08-31 | 2011-01-19 | 珠海思美亚碳粉有限公司 | Toner and method for preparing same |
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