CN102621843A - Universal powdered ink - Google Patents

Abstract

The invention provides universal powdered ink, which comprises the following components in percentage by weight: 50-60 percent of Fe3O4 powder, 20-30 percent of polyacrylate-styrol copolymer, 10-20 percent of charge control agent, 4-6 percent of styrene-acrylic resin and 4-6 percent of ferric oxide. The universal powdered ink is obtained by the following steps that: the Fe3O4 powder is processed by supercritical CO2, and then is mixed with other raw materials, then the mixture is subjected to electric treatment of direct current, and finally, spray, drying, cyclone separation and mixing are carried out in sequence. The development imaging of the universal powdered ink is clear, bottom ash does not exist, and the quality and the stability of printed products are increased. The melting point is low, and the electric energy loss of a copier is greatly reduced. The particle of universal powdered ink is neat and uniform in shape, and therefore the universal powdered ink is suitably used for various machine types. The energy is saved and the environment is protected.

Description

A kind of universal ink powder

Technical field

The present invention relates to a kind of universal ink powder.

Background technology

In ink powder production and processing, the synthesis material of ink powder is one of core process in the ink powder versatility production technology, and the synthesis material of ink powder directly influences the quality of product, and is especially bigger to index influences such as control toner particle diameter, synthetic homogenizations.The working method one of ink powder is a chemical polymerization, is mainly used in the production color toner, and product only accounts for the share in market about 5%.The 2nd, Mechanical Method is the main flow mode of production of the world today, and the ink powder that this mode is produced accounts for the share in market about 95%.Mechanical Method has been acknowledged as the proven technique of current production ink powder, has formed perfect supporting system with interdependent raw material, the process equipment of the method, and product quality improves constantly, and production cost constantly descends, and production technology also move towards universal from monopolization.But the ink powder of producing with above two kinds of methods also has a lot of weak points.

1, pursues high-definition picture as people; Require toner particles when further dwindling; And the composition of each ink powder particle is realized homogenization again; Will run into impassable difficulty, because realize the dispersion distribution effects of each composition of many components composition is reached the following homogeneous of 3.2～4um, be the impassable difficulty of mixing roll to the material processing of viscoelastic attitude.If we can carry out the composition quantitative test to one one ink powder; Can find that their component content departs from the formula rate of macroscopic view far away; Although those sizes, particle that shape is close, also very big difference on the rerum natura can occur, be difficult to be applicable to various types.

2, owing to the ink powder particle is shaped with breaking method,, heterogeneous so shape of particle is random.Also easily aggegation and influence flowability in put procedure; Want to make the shape of particle to be bordering on sphere; Although we can use and grind or hot shaping methods is realized shaping, because increasing, decrease in yield or power consumption make the rising of ink powder production cost, Mechanical Method will lose the low advantage of cost.

In view of the foregoing; Chemical polymerization wants the composition of each ink powder particle to realize homogenization, reaches the versatility in numerous types, will run into impassable difficulty; Simultaneously in developing process; Again can be in developer residual fraction can't transfer to the residual powder of sub-image on the toner cartridge, produced and be not transferred and scraped the useless powder of useless powder logical sequence by scraper plate, the good ink powder transferring rate that adopts Mechanical Method to produce also can only reach about 85%; The useless powder that remains in the developing chamber waste powder hopper not only causes the waste of resource, also pollutes the environment.So how to let the ink powder produced can reach the effect of energy-saving and environmental protection, again can be and general by in the market numerous types?

Patent documentation CN101650539A discloses the method that a kind of supercritical fluid anti-solvent method is made inkpowder for printer; Its principle is to utilize organic solvent to the absorption of carbon dioxide dissolving and its volume dilution is expanded; Reduce the dissolving power of organic solvent, make solute form supersaturation and precipitating obtains 8～12 microns toner particles.

Summary of the invention

The objective of the invention is to solve the problem of existing toner particles shape and component concentration lack of homogeneity, a kind of CO of utilization is provided ₂Dissolve the universal ink powder that the spray method is produced.

The present invention realizes that the technical scheme that above-mentioned purpose adopts is:

A kind of universal ink powder contains 50～60%Fe by weight ₃O ₄Powder, 20～30% polyacrylate-styrol copolymer, 10～20% charge adjusting agents, 4～6% styrene-acrylic resins and 4～6% iron oxide, and obtain through following method:

(1) with Fe ₃O ₄Powder joins the high pressure that inside is equipped with filter screen and dissolves in the still, air in the still is found time again, and injects CO then ₂, regulate the temperature and pressure in the still, make CO ₂Be in supercriticality, stir;

(2) material that sees through filter screen in the step (1) is pumped in the agitated reactor; Again polyacrylate-styrol copolymer, charge adjusting agent, styrene-acrylic resin and iron oxide are added agitated reactor; Apply the DC voltage of 750～800V then to mixture, energising 30min, and stir;

(3) after the potpourri that obtains of step (2) got into the jet chamber and is atomized into particle, through dry, cyclonic separation, collecting diameter was the particle of 3.2～4 μ m, and the particle of collection passes through mixing roll again, promptly gets universal ink powder.

Beneficial effect of the present invention:

(1) working method is simple, and is harmless to human body;

(2) it is clear that universal ink powder of the present invention develops to picture, and no bottom ash has improved the quality and the stability of print product;

(3) fusing point of existing market ink powder is about more than 45 ℃, and the fusing point of the universal ink powder of the present invention is 38 ℃, greatly reduces the electric energy loss of duplicating machine;

(4) universal toner particle diameter of the present invention is distributed as 3.2～4 μ m; Compare with existing commercially available ink powder, more regular on particle shape, even, thus can on multiple different type of machines, use; Like two group such as Ricoh, Toshiba, Sharp, Minolta powder laser copier; Single group powder laser copier such as Canon, KYOCERA, laser printers such as Hewlett-Packard, Samsung, totem, association, energy-conserving and environment-protective.

Description of drawings

Fig. 1 is a production procedure synoptic diagram of the present invention.

Wherein, 1-carbon dioxide storage tank, 2-high pressure dissolve still, 21-filter screen, 3-agitated reactor, 31-direct supply, 4-jet chamber, 41-sprayer, 5-air-dry machine, 6-cyclone separator, 7-collection powder, 8-mixing roll.

Fig. 2 is the MIcrosope image of commercially available common ink powder.

Fig. 3 is the MIcrosope image of the universal ink powder of the present invention.

Embodiment

Below in conjunction with embodiment and accompanying drawing the present invention is done explanation further.

Embodiment 1

With Fe ₃O ₄Powder joins high pressure and dissolves in the still, and the open vacuum pump is found time air in the still, closes vacuum pump then, opens high-pressure pump with CO ₂Inject high pressure and dissolve still, regulate temperature in the still be higher than 31.1 ℃ with pressure greater than 7.4MPa, this moment CO ₂Can be in supercriticality, start stirring apparatus, stirring rate is 1000 r/min, and filter screen 21 is housed in high pressure dissolves still 2, in whipping process, can see through filter screen 21 smaller or equal to the particle of 3.0 μ m;

Will be through the material (Fe that contains 50 grams of filter screen 21 ₃O ₄) pump in the agitated reactor, agitated reactor is provided with electrode and is connected with the positive and negative electrode of direct supply respectively through lead, and then adds the polyacrylate-styrol copolymer of 20 grams, the charge adjusting agent of 20 grams, the styrene-acrylic resin of 4 grams and the brown iron oxide of 6 grams; Start stirring apparatus; Stirring rate is 1000 r/min, and the switch of opening direct supply is to the logical 30min direct current of mixture, and DC voltage is 750V; In whipping process, make particle surface produce static charge;

The mixture that will pass through Direct current treatment gets into the jet chamber through sprayer and is atomized into toner particles; Dry by air-dry machine then; Getting into cyclone separator again, is that the toner particles of 3.2～4 μ m is sent into mixing roll with collecting diameter, grinds through high speed rotating; Make ink powder more regular mellow and full, promptly get universal ink powder.

Said polyacrylate-styrol copolymer is to be that (methyl acrylate and cinnamic volume ratio are 4～8:1) to monomer, add 1～5% initiator A IBN of multipolymer weight, obtain in 80 ℃ of following copolyreaction of temperature with methyl acrylate and styrene.

Embodiment 2

Be with embodiment 1 difference, will be through the material (Fe that contains 60 grams of filter screen 21 ₃O ₄) pump into agitated reactor after, with the methyl acrylate of 15 grams, the styrene of 5 grams, the initiator A IBN of 1 gram, the charge adjusting agent of 10 grams, the styrene-acrylic resin of 6 grams and the brown iron oxide of 4 grams, start stirring apparatus again; Stirring rate is 1000 r/min; Behind 80 ℃ of copolyreaction 30min of temperature, the switch of opening direct supply is to the logical 30min direct current of mixture, and DC voltage is 800V; In whipping process, make particle surface produce static charge.

All the other steps and embodiment 1 basically identical.

Claims (1)

1. universal ink powder, it is characterized in that: said universal ink powder contains 50～60%Fe by weight ₃O ₄Powder, 20～30% polyacrylate-styrol copolymer, 10～20% charge adjusting agents, 4～6% styrene-acrylic resins and 4～6% iron oxide, and adopt following method to obtain:

(1) with Fe ₃O ₄Powder joins the high pressure that inside is equipped with filter screen and dissolves in the still, air in the still is found time again, and injects CO then ₂, regulate the temperature and pressure in the still, make CO ₂Be in supercriticality, stir;

(2) material that sees through filter screen in the step (1) is pumped in the agitated reactor; Again polyacrylate-styrol copolymer, charge adjusting agent, styrene-acrylic resin and iron oxide are added agitated reactor; Apply the DC voltage of 750～800V then to mixture, energising 30min, and stir;

(3) after the potpourri that obtains of step (2) got into the jet chamber and is atomized into particle, through dry, cyclonic separation, collecting diameter was the particle of 3.2～4 μ m, and the particle of collection passes through mixing roll again, promptly gets universal ink powder.

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