CN101664710A

CN101664710A - Manufacturing method of ultra-fine iron oxide black

Info

Publication number: CN101664710A
Application number: CN200910173987A
Authority: CN
Inventors: 王铭; 谭刚
Original assignee: NANTONG BOJO PIGMENTS CO Ltd
Current assignee: NANTONG BOJO PIGMENTS CO Ltd
Priority date: 2009-09-30
Filing date: 2009-09-30
Publication date: 2010-03-10
Anticipated expiration: 2029-09-30
Also published as: CN101664710B

Abstract

The invention relates to a manufacturing method of ultra-fine iron oxide black, which is composed of coarse grinding and cyclone milling steps; the meshes of the iron oxide black is 8-12 after being coarse-ground; the manufacturing method is characterized in that: the rotating speed of the cyclone milling is 2000 revolutions per minute, and the raw material is driven to rotate at high speed of 120-130 meter per second; when cyclone milling rotates at high speed, 1-4 percent of grinding aids are dropped in the raw material by weight percentage. The manufacturing method has the advantages that the Hegman fineness of color paste of the iron oxide black are improved and can reach 5-6 level, and the covering power and tinting strength of pigment is improved at the same time; in the method, as the grinding aids are used, the output can be improved by 3-40 percent.

Description

A kind of manufacturing method of ultra-fine

Technical field

The present invention relates to a kind of manufacturing method of ultra-fine, be specifically related to a kind ofly by ultra micro refinement last handling process, and add a kind of grinding aid BJ-03B and obtain ultra-fine iron oxide black pigment, be applicable to water paint mill base or oil pastes, be highly susceptible to disperseing in coating, wetability is good.

Background technology

Iron oxide black chemistry tri-iron tetroxide (Fe by name ₃O ₄Or Fe ₂O ₃FeO), it has saturated blue black light black, and covering power and tinting strength, tinting power are all very high, and be very stable to the effect of light and atmosphere, be insoluble to alkali, be slightly soluble in diluted acid, then dissolving fully in concentrated acid, heat resistance is relatively poor, and oxidation easily under higher temperature generates red iron oxide.Iron oxide black is because of covering power, strong coloring force, and light fastness is good and be widely used in coating industry.

The iron oxide black that produces with oxidizing process since tinting strength, tinting power apparently higher than the iron oxide black that synthetic method generates, be widely adopted in recent years.Ferrous sulfate and NaOH are dropped in the reaction container, generate the hydroxide ferrum collosol immediately, the control pH value is about 8, and feeding steam is warming up to gradually about 100 ℃ and reacts, and bubbling air carries out oxidation simultaneously, is reflected at 8～10 hours and can makes required iron oxide black.Fineness requirement to pigment in pigment printing paste is very high.Fineness is represented the degree that each component is disperseed, ground in the coating, and particle is the smaller the better, and available scraper-type fineness gauge is tested, and Hegman fineness commonly used is represented.The main factor that influences pigment Hegman fineness is the size of pigment particles.Most of inorganic pigments are the crystalline texture that the unit is formed by crystallite, and X-ray diffraction is measured these crystallite dimensions and is generally tens dusts (0.1nm).Pigment seldom exists with single microcrystalline form, but exists with the primary particle form, and primary particle is that strong interaction power forms between the crystallite, and granularity is 5nm～1um, can be distributed in the paint vehicle easily to go.Primary particle again can be by forming agglutination body or agglomerate between local interaction such as interface or the particular point, between angle or the limit.Usually the attraction between the agglomerate wants much weak, and it is so infirm to bond, and disperses than being easier to; But aggregation is because van der Waals' force is bigger, and it is more firm to bond, and difficulty is disperseed.These agglomerates and aggregation have caused big, the chap of the change of iron black particle, make mill base after, the Hegman fineness can be very poor.Simultaneously particle size directly influences the covering power and the tinting strength, tinting power of pigment, and when particle diameter reduces or surface when increasing, blackness increases, and the absorption of light is more, and reflection still less makes the people feel more black.Particle is more little, and decentralization is big more, and catoptrical area is many more, thereby covering power is big more.For most of pigment, the most effective particle size is half of visible wavelength.Tinting strength, tinting power is that a certain pigment mixes the ability that the back forms the color power with another pigment.Particle is more little, and tinting strength, tinting power is big more.At this difficult problem, carry out miniaturization by ultra-fine grinding machinery-Cyclone mill and handle, but can not reach the coating grade standard, the Hegman fineness is up to 2 grades, and output is very low, about 600Kg/h, very big noise is arranged in the production, be not suitable in actual production, using.

Summary of the invention

Main task of the present invention is to provide a kind of manufacturing method of ultra-fine, in order to overcome the black iron oxide pigment Hegman fineness difference of generally in mill base and coating, using at present and these shortcomings that yield poorly, provide ultramicrofine iron oxide black kind to replace common iron oxide black, after being used in pigment printing paste, can improve Hegman fineness, covering power and the tinting strength, tinting power of mill base, keep the uniformity of mill base, stable in the storage time, do not decompose, do not precipitate.

In order to solve above technical problem, a kind of manufacturing method of ultra-fine of the present invention is made of coarse crushing and Cyclone mill two steps, and the order number of iron oxide black after coarse crushing is at the 8-12 order; It is characterized in that: the rotating speed of described Cyclone mill is 2000 rev/mins, it drives raw material and runs up to make with the speed of 125 meter per seconds and produce strong shearing force between the raw material, open agglomerate and aggregation, make the iron oxide black particle be tending towards the primary particle state, produced simultaneously Mechanochemical Effect, improved iron oxide black particle plane of crystal state, evenly regular, big or small identical around becoming by the original irregular spinel-type surface that differs in size.

When Cyclone mill runs up, in raw material, be 30l/h with speed, dripping percentage by weight is the grinding aid of 1%-4%, this grinding aid helps to improve mill efficiency or cuts down the consumption of energy, and improves output.Handle the product that obtains by this method, the Hegman fineness all reaches 5～6 grades, and output is for having improved 3%～40%.

Further, described grinding aid is a PAA.

The invention has the advantages that:

(1) the oxidizing process iron oxide black can be improved the Hegman fineness of mill base with the inventive method, reaches 5～6 grades, has improved the covering power and the tinting strength, tinting power of pigment simultaneously;

(2) the inventive method can improve output 3%～40% owing to use grinding aid.

The specific embodiment

The invention will be further described below by embodiment:

Embodiment 1:

500 kilograms of commercially available common iron oxide blacks (trade names 703), raw material elder generation meal is broken into the 8-12 order, storehouse then feeds intake, mix up Cyclone mill parameter (2000 rev/mins of rotating speeds, power of motor 130KW), slowly add PAA while feeding intake, the grinding aid consumption to iron oxide black pigment XM703 to influence the result as follows:

After the PAA consumption surpassed 4%, the hydrotrope exceeded standard, and output also reaches capacity substantially, so the PAA consumption suits 1%～4%.

The comparative example 1:

500 kilograms of commercially available common iron oxide blacks (trade names 703) are broken into the 8-12 order to raw material elder generation meal, and the storehouse that feeds intake then is that 2000 rev/mins, power of motor are the Cyclone mill of 130KW with rotating speed, begins pulverizing, and obtaining product is QM703.Equally 703 iron black 500 kilograms of first meal are broken into the 8-12 order, the storehouse that feeds intake then is with the Cyclone mill of same parameter, slowly add PAA while feeding intake, addition is 2%, and adding speed is 30l/h, obtain product XM703, being compared as follows shown in the table of both Hegman fineness and output:

Title	The Hegman fineness	Output/Kg/h
Title	The Hegman fineness	Output/Kg/h	??QM703	??2	??600
??XM703	??6	??700	??QM703	??2	??600

The result proves that after increasing grinding aid, the yield of its product obviously increases.

Embodiment 2:

500 kilograms of commercially available common iron oxide blacks (trade names 703), raw material elder generation meal is broken into the 8-12 order, and the storehouse that feeds intake then mixes up Cyclone mill parameter (power of motor 130KW), slowly add PAA while feeding intake, the Cyclone mill rotating speed to iron oxide black pigment XM703 to influence the result as follows:

Can find out that from above-mentioned example rotating speed has very big influence to product fineness and output, 2000 rev/mins proper, little to the product influence too greatly, but kinetic equation loss is big.

Claims

1, a kind of manufacturing method of ultra-fine is made of coarse crushing and Cyclone mill two steps, and the order number of iron oxide black after coarse crushing is at the 8-12 order; It is characterized in that: the rotating speed of described Cyclone mill is 2000 rev/mins, it drives raw material and runs up with the speed of 120-130 meter per second and produce high shear force and make the iron oxide black particle be tending towards the primary particle state, produced simultaneously Mechanochemical Effect, improved iron oxide black particle plane of crystal state, evenly regular, big or small identical around becoming by the original irregular spinel-type surface that differs in size; When described Cyclone mill ran up, the percentage by weight that drips grinding aid in raw material was 1%～4%.

2, a kind of manufacturing method of ultra-fine according to claim 1 is characterized in that: the adding speed of described grinding aid is 30l/h.

3, a kind of manufacturing method of ultra-fine according to claim 1 is characterized in that: described grinding aid is a PAA.