CN103336414A - Color toner and preparation method thereof - Google Patents

Abstract

The invention discloses color toner which comprises the following components in parts by weight: 60-80 parts of styrene, 15-25 parts of butyl acrylate, 1-4 parts of crosslinking agent, 3-7 parts of wax, 3-6 parts of pigment, 0.2-1.5 parts of charge regulator, 1-2 parts of initiator, 0.1-2 parts of molecular weight regulator, 1.0-3 parts of surfactant and 1-4 parts of silicon dioxide, wherein the crosslinking agent is one or more of divinylbenzene, isoprene and butadiene. According to the invention, a small amount of crosslinking agent is added on the basis of the original formula, so that the polymer molecular weight can be greatly increased or the chain can be lengthened, thus increasing the crosslinking degree, improving the water resistance and lowering the waste toner rate; the glass transition temperature of the prepared color toner is increased a little, thus enhancing the storage stability; the particles are uniform, and the circularity of the toner is more than 0.93; the stability is satisfactory, the structure is easy to control, and the softening point temperature is 105-125 DEG C; the color toner does not need to be graded, is narrow in particle size distribution and has an average particle size D50 of 5-8 mu m; and the production process is simple, the reaction time is shortened, and the cost is greatly reduced.

Description

A kind of color toner and preparation method thereof

Technical field

The present invention relates to a kind of reprographic printing color toner and preparation method thereof.

Background technology

Color toner is to be the theme with fluoropolymer resin, pigment, is the micron order hi-tech joint product of auxiliary agent with adjuvants such as charge control agents, is the main consumptive material of office output devices such as xerox and laser printing.Along with office automation and informationalized development, coloured image and the literal of quick output high-resolution are had higher requirement, the annual requirement of China's color toner is more than 3000 tons according to statistics, and annual about 20% the growth rate that keeps.

At present, the preparation method of color toner mainly contains two classes: be respectively traditional fusion comminuting method and chemical polymerization.Yet traditional fusion comminuting method process complexity, the ink powder fabrication cycle is long, energy consumption is big, cost is high, surface propertys such as the particle diameter of ink powder, apparent pattern, flowability are difficult to control, can't satisfy the requirement of modern ink powder high resolving power, suitable fixing temperature and development density.It is that resin monomer, pigment and adjuvant are blended in the reactor that chemical polymerization prepares ink powder, and the method for employing polymerization directly obtains the granular product of ink powder.The method that a kind of emulsion polymerization prepares color toner is disclosed as Chinese patent CN201110114579.0, this method is the emulsion performed polymer for preparing materials such as pigment, wax material earlier, carry out emulsion polymerization again, wash then, dry and necessary back interpolation etc.The ink powder of producing has can improve the printing resolving power, image lovely luster, advantages such as surface-brightening.And for example Chinese patent CN200910233446.8 discloses the method that a kind of emulsion polymerization in situ prepares color toner, the toner particle diameter size control easily of this method preparation, and production cost is lower.

But the defective that said method exists is: the substep operation, and the process complexity, the time of reaction is long, and energy consumption is big, and cost is higher, and the quality of ink powder remains further to be improved.

Summary of the invention

For the shortcoming and deficiency that overcome prior art, the object of the invention is to provide a kind of color toner.

Another object of the present invention is to provide a kind of preparation method of above-mentioned color toner.

The present invention is achieved by the following technical solutions:

A kind of color toner is counted by weight, comprises following component:

60 ~ 80 parts of styrene;

15 ~ 25 parts of butyl acrylates;

1 ~ 4 part of crosslinking chemical;

3 ~ 7 parts in wax;

3 ~ 6 parts of pigment;

0.2 ~ 1.5 part of charge adjusting agent;

1 ~ 2 part of initiating agent;

1.0 ~ 3 parts in surfactant;

0.1 ~ 2 part of molecular weight regulator;

Silica 1 ~ 4 part;

Described crosslinking chemical is one or more in divinylbenzene, isoprene or the butadiene.

Add a spot of crosslinking chemical and can make the molecular weight of ink powder resin be improved, the mechanical strength of toner particles improves, and obviously the macromolecule resin water-intake rate than non-crosslinked type is low for the macromolecule resin of cross-linking type in addition; Excessive adding then can make ink powder become block, can't process and use.Addition 1 ~ 4 weight portion of crosslinking chemical is less than 1 part, does not have the effect of improving molecular weight, and more than 4 parts, the affiliation that adds of a large amount of crosslinking chemicals makes and the benzene emulsion instability is easy to occur gel, influences polymerization and ink powder quality.

Described pigment is selected from any one in black pigment, yellow uitramarine, blue pigment, the red pigment; Described initiating agent is azoisobutyronitrile or ammonium persulfate; Described wax is one or more in Brazil wax, polypropylene wax or the C80 paraffin; Described molecular weight regulator is lauryl mercaptan.

The preparation method of color toner of the present invention comprises the steps:

1) taken by weighing styrene according to the above ratio, butyl acrylate, crosslinking chemical, wax, pigment, charge adjusting agent, initiating agent joins in the reactor, starting stirrer stirs, speed of agitator is adjusted to 5 ~ 15 Hz (frequency converter frequency value), the dispersed with stirring time is 0.5 ~ 1 h, stir, after join in the reactor that surfactant and deionized water are housed, continue dispersed with stirring, speed of agitator is adjusted to 15 ~ 25 Hz (frequency converter frequency value), the dispersed with stirring time is 0.5 ~ 1 h, stir, be adjusted to 25 ~ 35 Hz (frequency converter frequency value) at speed of agitator then, temperature of reaction is 75 ~ 95 ℃ of reactions down, reaction time is 1.5 ~ 3.5 h, temperature retention time is 1.5 ~ 3 h, and the cooling back is carried out breakdown of emulsion with methyl alcohol to it, separate, obtain containing the material of the solid particle of torispherical;

2) with deionized water the material of the solid particle that contains torispherical is cleaned the solid particle that obtains torispherical again;

3) under 40 ~ 45 ℃ temperature, aim at spherical solid particle and carry out the drying processing, make its water cut be lower than 0.5wt%;

4) last, add silicon dioxide and also evenly mix, the solid particle of dried torispherical is carried out modification handle, obtain mean grain size D ₅₀It is the color toner of 5 ~ 8 μ m.

The present invention compared with prior art has following beneficial effect:

1) the present invention can make polymer molecular weight increase greatly or chain growth by add a spot of crosslinking chemical on original prescription basis, increases degree of crosslinking, improves water tolerance, reduces useless powder rate;

2) its glass transition temperature of the color toner for preparing is increased, and improves its storage stability; Uniform particles, the ink powder circularity〉0.93; Good stability, structure is controlled easily, and softening point temperature is 105 ~ 125 ℃; Without classification, narrow diameter distribution, mean grain size D ₅₀Be 5 ~ 8 μ m.

3) production technology of the present invention is simple, has shortened the reaction time, greatly reduces cost.

Embodiment

Further specify the present invention below by embodiment, following examples are preferred implementation of the present invention, but embodiments of the present invention are not subjected to the restriction of following embodiment.

Wherein, used black pigment is import pigment black R330R among the embodiment, and yellow uitramarine is to consolidate transparent yellow PY83 forever, and blue pigment is phthalocyanine blue PB15:3, and red pigment is to consolidate bright red PR170 forever;

Described charge adjusting agent is the DL-N28 metal complex that Long-Ting of Hubei Chemical Co produces;

Described surfactant is the CO-436 surfactant that production base, French Rhodia Wuxi produces;

Described molecular weight regulator is the lauryl mercaptan of Guangzhou San Wang chemical material company limited;

Described silicon dioxide is the R972 hydrophobic silica that German goldschmidt chemical corporation is produced.

Take by weighing styrene by the formula rate in the table 1, butyl acrylate, crosslinking chemical, wax, pigment, charge adjusting agent, initiating agent, molecular weight regulator joins in the reactor, starting stirrer stirs, speed of agitator is adjusted to 10 Hz (frequency converter frequency value), the dispersed with stirring time is 0.5 ~ 1 h, stir, after join in the reactor that surfactant and deionized water are housed, continue dispersed with stirring, speed of agitator is adjusted to 20 Hz (frequency converter frequency value), the dispersed with stirring time is 0.5 ~ 1 h, stir, be adjusted to 30 Hz (frequency converter frequency value) at speed of agitator then, temperature of reaction is 75 ~ 95 ℃ of reactions down, reaction time is 1.5 ~ 3.5 h, temperature retention time is 1.5 ~ 3 h, and the cooling back is carried out breakdown of emulsion with methyl alcohol to it, separate, obtain containing the material of the solid particle of torispherical; With deionized water the material of the solid particle that contains torispherical is cleaned the solid particle that obtains torispherical again; Under 40 ~ 45 ℃ temperature, aim at spherical solid particle and carry out the drying processing, make its water cut be lower than 0.5wt%; At last, add silicon dioxide and also evenly mix, the solid particle of dried torispherical is carried out modification handle, obtain mean grain size D ₅₀It is the color toner of 5 ~ 8 μ m.

Each concrete proportioning and test performance result thereof who forms in table 1 embodiment and the Comparative Examples

	Embodiment 1	Embodiment 2	Embodiment 3	Embodiment 4	Embodiment 5	Comparative Examples 1	Comparative Examples 2	Comparative Examples 3
									Styrene	60	72	80	70	65	60	80	72
Butyl acrylate	15	18	25	20	22	15	25	18
									Butadiene	?	?	?	1	?	?	?	?
Isoprene	?	?	?	?	2	?	?	?
									Divinylbenzene	2	3	4	?	?	?	?	8
Brazil wax	4	5	7	3	6	4	7	3
									Pigment	3	5	6	4	3	3	6	4
The DL-N28 metal complex	0.5	1	1.5	0.2	1	0.5	1.5	0.2
									Ammonium persulfate	1	1.5	1.5	2	1.5	1	1.5	2
Lauryl mercaptan	0.3	2	1.0	0.8	0.1	0.3	1.0	0.8
									CO-436	1	1.5	3	2	1	1	3	2
Silicon dioxide	2	3	4	1	3	2	4	1
									Useless powder rate/%	12.2	11.1	13.4	12.9	12.5	14.6	14.8	16.7
Tg/℃	62.6	63.4	64.3	57.9	53.4	61.1	60.9	66.7
									Circularity	0.95	0.97	0.98	0.96	0.95	0.93	0.92	0.85
Softening point temperature/℃	122.1	123.2	124.5	112.6	107.5	120.3	119.2	126.8
									Mean grain size/μ m(D 50）	5~8	5~8	5~8	5~8	5~8	5~9	4~9	3~12

Every performance test standard:

Glass transition temperature (Tg): use NETZSCH DSC-204 differential scanning calorimeter to carry out the DSC test, proofread and correct with pure indium.Sample size is 5 ~ 10 mg, and temperature range is 0 ~ 200 ℃, and heating rate is 10 ℃/min.

Circularity: the circularity of toner particles adopts Zhuhai American-European gram figure instrument to measure.

Softening point temperature: the thermal deformation vicat softening point temperature analyzer that adopts the Kunlun, Dongguan.

Mean grain size D ₅₀: toner particle diameter and the employing Beckman Ku Erte LS 13 320 serial laser particle size analyzers that distribute thereof are measured.

Contrast as can be seen from embodiment and the Comparative Examples of last table 1, the present invention can make polymer molecular weight increase greatly or chain growth by add a spot of crosslinking chemical on original prescription basis, increases degree of crosslinking, improves water tolerance, reduces the powder rate of giving up; Its glass transition temperature of the color toner for preparing is increased, and improves its storage stability; Uniform particles, the ink powder circularity〉0.93; Good stability, structure is controlled easily, and softening point temperature is 105 ~ 125 ℃; Without classification, narrow diameter distribution, mean grain size D ₅₀Be 5 ~ 8 μ m.

Claims (3)

1. a color toner is characterized in that, counts by weight, comprises following component:

60 ~ 80 parts of styrene;

15 ~ 25 parts of butyl acrylates;

1 ~ 4 part of crosslinking chemical;

3 ~ 7 parts in wax;

3 ~ 6 parts of pigment;

0.2 ~ 1.5 part of charge adjusting agent;

1 ~ 2 part of initiating agent;

1.0 ~ 3 parts in surfactant;

0.1 ~ 2 part of molecular weight regulator;

Silica 1 ~ 4 part;

Described crosslinking chemical is one or more in divinylbenzene, isoprene or the butadiene.

2. color toner according to claim 1 is characterized in that, described pigment is selected from any one in black pigment, yellow uitramarine, blue pigment, the red pigment; Described initiating agent is azoisobutyronitrile or ammonium persulfate; Described wax is one or more in Brazil wax, polypropylene wax or the C80 paraffin; Described molecular weight regulator is lauryl mercaptan.

3. the preparation method of each described color toner of claim 1 ~ 2 is characterized in that, comprises the steps:

1) taken by weighing styrene according to the above ratio, butyl acrylate, crosslinking chemical, wax, pigment, charge adjusting agent, initiating agent, molecular weight regulator joins in the reactor, starting stirrer stirs, speed of agitator is adjusted to 5 ~ 15 Hz, the dispersed with stirring time is 0.5 ~ 1 h, stir, after join in the reactor that surfactant and deionized water are housed, continue dispersed with stirring, speed of agitator is adjusted to 15 ~ 25 Hz, the dispersed with stirring time is 0.5 ~ 1 h, stir, be adjusted to 25 ~ 35 Hz at speed of agitator then, temperature of reaction is 75 ~ 95 ℃ of reactions down, reaction time is 1.5 ~ 3.5 h, temperature retention time is 1.5 ~ 3 h, and the cooling back is carried out breakdown of emulsion with methyl alcohol to it, separate, obtain containing the material of the solid particle of torispherical;

2) with deionized water the material of the solid particle that contains torispherical is cleaned the solid particle that obtains torispherical again;

3) under 40 ~ 45 ℃ temperature, aim at spherical solid particle and carry out the drying processing, make its water cut be lower than 0.5wt%;

4) last, add silicon dioxide and also evenly mix, the solid particle of dried torispherical is carried out modification handle, obtain mean grain size D ₅₀It is the color toner of 5 ~ 8 μ m.