WO2008006308A1

WO2008006308A1 - Powder coated by aluminium phosphate and its making method

Info

Publication number: WO2008006308A1
Application number: PCT/CN2007/070133
Authority: WO
Inventors: Yigang Zhang; Miao Zhang
Original assignee: Yigang Zhang; Miao Zhang
Priority date: 2006-07-03
Filing date: 2007-06-19
Publication date: 2008-01-17

Abstract

The powder which is obtained by mechanical-chemical processing and surface treating the micron-level powder into sub-micron or nano-meter level powder is disclosed. The powder has double- or three- layers structure, and its core is composed of oxides or hydrates, its shell is composed of oxygen-containing inorganic salts while its coating is composed of aluminum phosphate. The method for making the powder at low cost is also disclosed. The powder can be used for ceramics, fireproof material, plastics, rubber and paper as a powdery material, active filler and colorant.

Description

Technical field

The invention relates to a surface-modified inorganic powder and a preparation method thereof, in particular to an inorganic powder coated with an aluminum phosphate coating surface and a preparation method thereof, and also relates to the powder as a filler and a supplement Strongeners, colorants, rheological agents, adsorption carriers, powder materials for inks, paints, coatings, rubber, plastics, resins, sealants, adhesives, lubricants, drilling mud, stationery, household chemicals , paper, textiles, ceramic materials, refractory materials, magnetic materials, electronic materials, electromagnetic shielding materials, artificial biological tissues. Background technique

The refinement of the inorganic powder, the fine particle size of less than 1000 nm, or even less than 100 nm, can achieve important size effects. On the other hand, the finer the particle size, the easier it is to agglomerate, the surface properties of the powder are changed, and the dispersibility is improved, and an important size effect can also be obtained. By combining these two technologies, the size effect of the powder can be obtained to the utmost.

The prior art for preparing nanoscale inorganic powders is mostly carried out in the gas phase or in the liquid phase. In 1999, a solid phase method for the synthesis of nanoferrites was reported. See Journal of Inorganic Materials, Vol. 14, No. 3, pp. 385-390, and Chemical Research and Application, Vol. 1, No. 1, pp. 138-141. In 2001, a solid phase synthesis of nano zinc oxide was reported. See Fine Chemicals, Vol. 18, No. 12, pp. 696-698. In 2002, Chinese patent CN1359985 discloses a technique of pressurizing two materials to form a high-pressure fluid, mixing the reaction into a solid slurry, and separating and drying into nano-powder. In 2003, Chinese patent CN1433966 discloses a method for preparing nano zinc oxide by gas-solid phase reaction method. In 2004, Chinese patent CN1555949 discloses a method for preparing nanometer powder by liquid nitrogen cryogenic ball milling. The Journal of Nanoparticle Research, Vol. 6, No. 6, pp. 99-105, 2004, reports a method in which silica, iron oxide, and cobalt oxide are mixed together, ball milled for 50 hours, and heat treated at 900 ° C to prepare cobalt ferrite and two. a mixture of silica. The Nanotechnology, published in April 2006, pages 58-65, details the prior art of solid phase preparation of nanoparticles. There is no mention of the significance of the acid-base reaction, and there is no "acid-base reaction". These four words. The current situation is as follows: (1) The preparation process of nano-scale inorganic powder is complicated, the cost is high, the market price is several times higher than that of non-nano-scale inorganic powder; (2) the ultra-fine inorganic powder is difficult to disperse in the medium. Confused, failed to give full play to the size advantage. The difficulty in dispersing the ultrafine powder needs to be solved by the surface modification technique of the powder. Tioxide Group has been working on coating aluminum phosphate on titanium dioxide to improve the light resistance of paper. The company applied for Canada special lj CA1128817 (published in 1982), British patent GB2303366 (published in 1997), GB2333100, GB2333101 (1999). Published in the year), these patents are all prepared by wet method. The atomic ratio of aluminum to phosphorus in the aluminum phosphate coating is 1.8:1 to 1:1.4. A method of wet coating aluminum phosphate on titanium dioxide is also disclosed in U.S. Patent No. 2,004,025, 749 and U.S. Patent No. 2,005, 011, 408, which are incorporated herein by reference. U.S. Patent No. 2,005,069,706 discloses a metal oxide powder coated with aluminum phosphate by a wet process for shielding ultraviolet rays and protecting the skin. The theme of the article "Refractory Materials", Vol. 38, No. 2, pp. 103-106, 2004, is the preparation of lightweight alumina hollow sphere ceramics by in-situ synthesis of aluminum phosphate sintering aid. British Patent GB20060007931 discloses a brake pad material in which aluminum phosphate ceramic particles are synthesized in situ in their pores. These patents relating to aluminum phosphate have not focused on solving the problem of difficulty in dispersing ultrafine powders. Summary of invention

An object of the present invention is to provide a micronized inorganic powder coated with aluminum phosphate on the surface, in particular, an ultrafine-grade, ultra-micro-sized, nano-sized aluminum phosphate coating powder which is easily dispersed in a medium, and becomes a high Quality new powder materials.

Another object of the present invention is to provide a process for preparing the above aluminum phosphate coated powder which is simple in process, low in cost, and free from waste.

Still another object of the present invention is to provide the above aluminum phosphate coated powder as a filler, a reinforcing agent, a coloring agent, a rheological agent, an adsorption carrier, a powder material in an ink, a paint, a paint, a rubber, a plastic, a resin, and a seal. Glue, adhesives, lubricants, drilling mud, stationery, household chemicals, paper, textiles, ceramic materials, refractory materials, magnetic materials, electronic materials, electromagnetic shielding materials, applications in artificial biological tissues.

The first technical solution of the product of the invention is: a coated powder whose core is passed through a solid phase by two or more compounds selected from the group consisting of oxides, hydroxides, and solid inorganic oxyacids by mechanochemistry The inorganic oxygen-containing salt formed by the acid-base reaction; the surface coating is composed of aluminum phosphate by de-agglomeration while being pulverized, wherein the atomic ratio of aluminum to phosphorus is 0.33 : 1 to 3 : 1, aluminum atom It may be partially substituted by boron, iron, ruthenium, zinc, magnesium, calcium atoms, and the total number of substituted atoms is less than the number of aluminum atoms.

A second technical solution of the product of the invention is: a coated powder having an inner core of one or more oxygen a composition of a compound or a hydroxide formed by a solid phase acid-base reaction of the above compound with another compound or compounds selected from the group consisting of an oxide, a hydroxide, a solid inorganic oxyacid, and a concentrated phosphoric acid under the action of a mechanochemistry The composition of the inorganic oxygen-containing salt; the surface coating is composed of aluminum phosphate by de-agglomeration while being pulverized, wherein the atomic ratio of aluminum to phosphorus is 0.33 : 1 to 3 : the aluminum atom may be partially boron, iron, The ruthenium, zinc, magnesium, and calcium atoms are substituted, and the total number of substituted atoms is less than the number of aluminum atoms.

A third technical solution of the product of the invention is: a coated powder, the inner core of which is composed of an aluminum-containing compound, at least one of which is selected from the group consisting of alumina, aluminum hydroxide, aluminate, aluminosilicate, clay mineral The surface coating is coated by de-agglomeration while being pulverized by the above-mentioned aluminum-containing compound and one or more selected from the group consisting of phosphorus pentoxide, concentrated phosphoric acid, phosphorous acid, aluminum dihydrogen phosphate, and aluminum dihydrogen phosphate. The compound is composed of aluminum phosphate formed by solid phase acid-base reaction under the action of mechanochemistry, wherein the atomic ratio of aluminum to phosphorus is 0.33:1 to 3:1, and the aluminum atom may be partially boron, iron, bismuth, zinc, magnesium. , calcium atom substitution, the total number of substituted atoms is less than the number of aluminum atoms.

The fourth technical scheme of the product of the invention is: the inorganic powder is formed into a coating powder by de-agglomerating and coating, and the coating is composed of aluminum phosphate, wherein the atomic ratio of aluminum to phosphorus is at least one selected From the surface of the powder of the basic oxide, the alkali hydroxide, the metal powder, the weak acid and the strong alkali inorganic salt is 0.33:1 to 0.67: 1, in the amphoteric oxide, amphoteric hydroxide, phosphoric acid The surface of the near-neutral inorganic salt powder such as a salt, a strong acid strong base salt, a weak acid weak base salt or the like is 0.65 : 1 to 1. 35 : 1, on the surface of an acidic oxide, a strong acid weak base inorganic salt powder The upper is 1. 3 : 1 to 3 : 1, at least one selected from the group consisting of silicates, aluminosilicates, clay minerals, silicides, nitrides, carbides, sulfides, metals and metals or metals and non-metals The composition of the alloy, the inorganic coating powder, and the mixture of the above various substances or the compound or the composite powder on the surface of the surface is 0.33: 1 to 3: 1.

Detailed description of the invention

The first technical solution of the dry preparation method of the coated powder of the present invention comprises the following sequence of steps:

(1) one or more compounds selected from the group consisting of an acidic oxide, an acid hydroxide, a solid inorganic oxyacid, and a concentrated phosphoric acid, and a compound selected from the group consisting of a basic oxide, an alkali hydroxide, and an inorganic oxygen salt Adding one or more other powders together and mixing them evenly;

(2) Grinding and pulverizing powder particles, and causing solid phase acid-base reaction between the powders under mechanochemical action a composite powder which is converted into an inorganic oxygen-containing salt powder, or whose outer shell is an inorganic oxygen-containing salt, and whose inner core is an oxide or a hydroxide;

(3) Adding one or more compounds selected from the group consisting of aluminum hydroxide, aluminum phosphate, phosphorus pentoxide, concentrated phosphoric acid, phosphorous acid, aluminum dihydrogen phosphate, and aluminum dihydrogen phosphate, at 0.33 : 1 to 3 : 1 to adjust the atomic ratio of aluminum to phosphorus of these compounds, with or without the solvation compound as the source of the solvated segment of the powder surface, continue grinding, pulverizing, and coating the powder particles in the powder state Forming a powder having an aluminum phosphate coating;

(4) Heat at 70 ° C to 20 °C for 10 minutes to 100 minutes.

The second technical solution of the dry preparation method of the coated powder of the present invention comprises the following sequence of steps:

(1) adding, in the inorganic powder, one or more compounds selected from the group consisting of aluminum hydroxide, aluminum phosphate, phosphorus pentoxide, concentrated phosphoric acid, phosphorous acid, aluminum dihydrogen phosphate, and aluminum dihydrogen phosphate. 0. 33 : 1 to 3 : 1 to adjust the atomic ratio of aluminum to phosphorus of these compounds, with or without the solvating compound as the source of the solvated segment of the powder surface, mixing, pulverizing and decomposing in the powder state Poly, coated powder particles;

(2) Heat at 70 ° C to 20 °C for 10 to 100 minutes.

The general idea of the present invention consists of two aspects that are indivisible: one is miniaturization, and the other is surface modification; specifically, on the one hand, the depolymerized powder particles are pulverized by mechanical action or mechanochemical action to make them finer. On the other hand, the surface of the powder is coated with aluminum phosphate to isolate the particles from being agglomerated; summarized in one sentence, the general idea of coating the aluminum phosphate while decomposing and pulverizing. In the present invention, there are two methods for promoting powder refinement, one is pure mechanical action pulverization and depolymerization, and the other is mechanochemical pulverization and depolymerization, that is, solid phase acid is generated between the powders under mechanical action. The alkali reacts to destroy the crystal lattice and achieves the fineness of the powder. The fine powder has many defects and charge imbalances on the surface, and it is easy to agglomerate and cannot obtain a true fine powder. Therefore, it is necessary to coat the powder particles with aluminum phosphate while pulverizing and depolymerizing to obtain dispersibility. Good fine powder. This is the general idea of coating aluminum phosphate while decomposing and pulverizing. The above-mentioned method of mechanical chemistry pulverization and depolymerization is accustomed to the high energy ball milling method in the literature. This kind of title is not comprehensive and is not completely accurate; the nominal mechanical chemical grinding method is more precise.

The present invention contains eight findings, namely eight new insights, which are described in a logical order as follows:

The first discovery of the present invention is to find a solid-phase acid-base reaction under mechanochemistry, and to pulverize while reacting, two or more selected from the group consisting of micron-sized oxides, hydroxides, solid inorganic oxyacids, and concentrated phosphoric acid. The compound reacts in a powder state and is converted into a nano-scale inorganic oxygen-containing salt powder having an ultra-fine, ultra-fine, or even three-dimensional particle size of less than 100 nm. The rate of reaction and conversion depends on the difference in electronegativity between the oxide, hydroxide, and solid inorganic oxyacid powder, i.e., the difference in acidity and alkalinity. The acid-base reaction destroys the crystal lattice of oxides and hydroxides, thereby greatly improving the effect of mechanical pulverization and achieving fineness that cannot be achieved by mechanical pulverization. For example, iron oxide has high hardness and mechanical abrasion, and can be used as an abrasive. However, if it is ground together with silica or concentrated phosphoric acid, it becomes easy to grind into ultrafine powder. In the case where the difference in acidity and alkalinity is small, for example, between zinc oxide and aluminum oxide, it takes several hours to form ultrafine zinc aluminate. In extreme cases, for example, between cobalt tetraoxide and ferric oxide, which have a very small difference in acidity and alkalinity, it takes several tens of hours to form ultrafine ferrite. Therefore, acid-base reaction plus mechanical pulverization is an effective means for powder refinement. On the other hand, the conditions of the acid-base reaction and the strength of the mechanical pulverization plus the time determine the final particle size of the powder. The short time is obtained in the ultra-fine grade, and the long time is obtained in the ultra-fine grade. At the nanoscale, there is no natural boundary between the individual grades, only artificial boundaries.

The difference between the first technical solution and the second technical solution of the product of the present invention is that: in the first embodiment, oxides, hydroxides, and solid inorganic oxyacids all participate in the reaction, and all are converted into inorganic oxygenates, In the second scheme, only a part of oxides and hydroxides participate in the reaction and constitute an inorganic oxygen-containing salt shell, oxides and hydroxide powders that do not participate in the reaction. Saved as a core, focusing on the refinement of oxides and hydroxides and surface modification.

In the second technical solution of the product of the present invention, the weight ratio between the core which does not participate in the reaction and the outer shell formed by the acid-base reaction can be arbitrarily regulated; the core which does not participate in the reaction is a fine object, and the solid phase acid-base reaction plus mechanical pulverization is The means for miniaturization, the outer shell formed by the acid-base reaction is a micro-finishing tool. In the case where the acid-base reaction between the oxide and the hydroxide is strong, the material participating in the reaction may be less, for example, zirconium dioxide as the inner core, zinc zirconate as the outer shell, and the outer shell may be thinner. In the case where the acid-base reaction between the oxide and the hydroxide is not too strong, the material to be reacted is a little more, for example, iron oxide is the core, and the iron silicate is the outer shell, and the outer shell must be thicker. The scale of the acid-base reaction, including the strength of the reaction and the amount of material participating in the reaction, determines the time required for the mechanical refinement of the powder. Regulate the thickness of the outer casing, one is to regulate the quality of the powder. Second, in order to meet the requirements of industrial scale production, the time required for mechanization and miniaturization is shortened. However, in the case where the core material is strongly alkaline, the outer casing must be thick enough so that the aluminum phosphate coating is protected from strong alkali, such as alkaline earth metal oxides, hydrogen in the inner core. Oxide occasions.

In the first and second aspects of the product of the present invention, the oxide, hydroxide, solid inorganic oxyacid, inorganic oxygen salt, at least one selected from the group consisting of phosphorus, arsenic, antimony, antimony, Silicon, germanium, tin, lead, boron, aluminum, gallium, indium, zinc, cadmium, copper, nickel, cobalt, iron, manganese, chromium, molybdenum, tungsten, vanadium, niobium, tantalum, titanium, zirconium, hafnium, alkaline earth metal An oxide or hydroxide of a rare earth element and a solid inorganic oxyacid or inorganic oxygen salt derived therefrom; wherein at least one of the solid inorganic oxyacids is selected from the group consisting of aluminum dihydrogen phosphate and aluminum tripolyphosphate (again Aluminium polyphosphate), phosphorous acid, boric acid, molybdic acid, tungstic acid, phosphomolybdic acid, phosphotungstic acid, metatitanic acid.

A second finding of the present invention found that the above solid phase acid-base reaction can be carried out at room temperature, but requires a long mechanical milling time. Increasing the temperature is beneficial to accelerate the solid-phase acid-base reaction. In theory, for every rc temperature increase, the chemical reaction speed is doubled. Increasing the temperature can increase the pulverization efficiency of mechanochemical action. However, if the temperature is too high, the adsorbed water or the crystal water will be completely removed, which is not conducive to the acid-base reaction. In general, the solid phase acid-base reaction can be carried out at temperatures from 0 ° C to 1 icrc. Heating up is not a necessary condition, but it is an effective aid.

A third finding of the present invention is the discovery that aluminum phosphate is an excellent surface modifier which forms a good envelope, sequesters a wide variety of powder particles, and weakens its agglomeration. Aluminium phosphate is a neutral electron crystal lattice composed of 0 - P - 0 - A1 - 0 - P - 0 - A1 -, insoluble in water, weak in polarity, lacking active groups on the surface, and having good antistatic property. , calendering, plasticity, slidability, also has high weather resistance, high light resistance, high acid and alkali resistance, high reflectivity, oral non-toxic and so on. Another advantage is that: aluminum phosphate is thermally decomposed above 170CTC. When the ceramic powder material or refractory powder material is sintered, the aluminum phosphate coating can act as a sintering aid when it reaches 170CTC or higher, and the strength of the material is improved. After thermal decomposition, the alumina remaining on the surface of the powder prevents the infiltration of oxygen and acts as an antioxidant. Under extreme conditions, such as aluminum phosphate coated on wear-resistant powder materials for lubricating oil, brake pads, and clutch sheets, the coating will be vitrified even if it is peeled off from the surface of the powder under strong rolling. , constitutes an extremely fine wear-resistant material, reducing wear.

The fourth finding of the present invention is to find that the aluminum phosphate coating must be firmly anchored on the powder to prevent the powder from agglomerating; the physical adsorption on the powder has a limited fastness; it must be chemically bonded to the powder to have Sufficient fastness. The aluminum phosphate is characterized in that the atomic ratio of aluminum to phosphorus can vary from 0.33 to 1 :3 to 1, and the aluminum phosphate coating itself is the strongest at a ratio of aluminum to phosphorus of 1:1. Aluminum phosphate The envelope needs to be bonded to the powder by an acid-base reaction by means of additional alumina or phosphorous oxide. The ideal ratio of aluminum to phosphorus is three, one is 0.5: 1, that is, one A1P04 is anchored to the alkaline powder by a P02. 5; the other is 2:1, that is, one A1P04 is passed through A101. 5 is anchored on the acidic powder on the surface; the other is 1: 1, that is, an A1P04 is anchored on a molecule whose surface is near neutral powder. The alkalinity and acidity of the surface of the powder are relative to A1P04. In fact, a part of the aluminum atom or the phosphorus atom needs to bear the task of linking the solvation segment with the aluminum phosphate film, and thus deviates from the above three ideal ratios of aluminum to phosphorus, and has a certain range of deviation. In the first to third aspects of the present invention, the outer shell of the powder is composed of an inorganic salt and is in an unstable amorphous state during the preparation, and the surface layer of the outer shell has both a cation and an anion. There are positrons and negative electrons, all of which have a certain migration ability; therefore, the aluminum-phosphorus atomic ratio of the aluminum phosphate coating can vary from 0.33:1 to 3:1, as long as the acid-base matches properly, Still firmly anchored. In the fourth embodiment of the present invention, the situation is quite complicated, the surface layer of the powder has both cations and anions, both positrons and negative electrons, and the aluminum-phosphorus atomic ratio of the aluminum phosphate coating is also 0.3. 3 : 1 to 3 : 1 range changes. I. 3: 1 to 0. The atomic ratio of aluminum to phosphorus is at least one surface selected from the group consisting of a basic oxide, an alkali hydroxide, a metal powder, and a weak acid strong base inorganic salt. 67 : 1, on the surface of the near-neutral inorganic salt powder such as phosphate, strong acid strong base salt, weak acid weak base salt, etc. is 0.65 : 1 to 1. 35 : 1, weak in acid oxide, strong acid The alkali inorganic salt powder has a surface of 1. 3 : 1 to 3 : 1, at least one selected from the group consisting of silicates, aluminosilicates, clay minerals, silicides, nitrides, carbides, sulfides, inorganic packages. The film powder and the mixture of the above various substances or the compound or the composite powder have a surface of 0.33 : 1 to 3 : 1 . In the aluminum phosphate coating, the aluminum atom may be partially substituted by the trivalent element boron, iron, or ruthenium atoms. Since they are all trivalent elements, their partial substitution does not affect the basic properties such as the smoothness of the aluminum phosphate coating; It may be partially substituted by the divalent element zinc, magnesium or calcium atoms. The small number of substitutions is beneficial to the dispersion of the powder. The number of substitutions has an adverse effect. In short, the total number of substituted atoms must be less than the number of aluminum atoms.

The aluminum phosphate coating and its anchoring to the powder are key to the success of the present invention.

A fifth finding of the present invention is to find that all or part of the source of aluminum in the aluminum phosphate coating may be derived from the aluminum-containing compound itself as a refining object, including alumina, aluminum hydroxide, aluminate, aluminosilicate, clay minerals. Etc. Therefore, it is only necessary to add one or more compounds selected from the group consisting of phosphorus pentoxide, concentrated phosphoric acid, phosphorous acid, aluminum dihydrogen phosphate, and aluminum dihydrogen phosphate to form a solid phase acid with the above aluminum-containing compound. The alkali reacts to form an aluminum phosphate coating, and at the same time, the powder is refined. In extreme cases, all of the aluminum contained in the powder is converted to aluminum phosphate, leaving the reaction product of these aluminum-containing compounds as the inner core. For example, after the reaction of kaolin with concentrated phosphoric acid, the reaction product silica is left as the inner core. This is a cost-effective way to save reagents and reduce the number of processes, thus constituting the concept of the third technical solution of the product of the invention derived from the second technical solution of the product of the invention. Here, aluminosilicate refers to feldspar, phyllite powder, red mud, silico-alumina, fly ash, oil shale ash; clay mineral is a specific aluminosilicate, here refers to high Ling stone, calcined kaolinite, smectite, attapulgite, palygorskite, sepiolite, pyrophyllite, vermiculite, and clays with them as main components. Here, the aluminum source of the aluminum phosphate coating is derived from the micronized object itself, and is not derived from the compound added from the outside, the amount of which is uncertain, and the range of variation is wide, so the atomic ratio of aluminum to phosphorus of the envelope is 0.33. : 1 to 3 : 1 . The third technical solution of the product of the invention has important economic significance, and relates to aluminum hydroxide as a rubber and plastic flame retardant and reinforcing agent, alumina as a refractory material or ceramic material, kaolin powder having various uses, and the like. The low cost of miniaturization and surface modification of the body, their potential market demand is huge.

The sixth finding of the present invention, and the most important finding, is that it is found that under the action of mechanical action or mechanochemistry, the aluminum phosphate is coated by depolymerization while being pulverized to obtain a fine powder. This forms the general idea of the foregoing invention; and thus derives a fourth technical solution of the product of the invention. The fourth technical scheme involves a wide variety of inorganic powders. In addition to strong alkaline powders and acid anhydrides, aluminum phosphate can be generally coated and easily dispersed. The powders specifically involved are at least one selected from the group consisting of alkalis. Oxides, alkaline hydroxides, metal powders, phosphates, acid oxides, silicates, aluminosilicates, clay minerals, silicides, nitrides, inorganic coated powders; including zinc, aluminum, Lead, rare earth oxides or hydroxides, aluminum powder, silver powder, gold powder, cobalt powder, chromium powder, copper powder, iron powder, manganese powder, molybdenum powder, niobium powder, nickel powder, lead powder, tin powder, niobium Powder, titanium powder, tungsten powder, zinc powder, zirconium powder, rare earth element powder, apatite, calcium phosphate, magnesium phosphate, zinc phosphate, silicon oxide, diatomaceous earth, cerium oxide, cerium oxide, zirconium oxide, chromium oxide, Molybdenum oxide, tungsten oxide, tin oxide, wollastonite, hydrated calcium silicate, hydrated aluminum silicate, glass beads, glass short fibers, zircon, lead silicate, expanded perlite powder, feldspar, phyllite Powder, Mud, silica-alumina, fly ash, oil shale ash, mullite, tourmaline, attapulgite, palygorskite, sepiolite, talc, pyrophyllite, kaolinite, calcined kaolinite, Smectite, vermiculite, molybdenum silicide, zirconium silicide, titanium silicide, silicon nitride, boron nitride, gallium nitride, titanium nitride, zirconium nitride, aluminum nitride, inorganic coated lead chromate pigment, and a mixture or compound or complex between them. The inorganic powder according to the fourth aspect of the present invention is further characterized in that at least one selected from the group consisting of elemental powders, metal powders, oxides, hydroxides, carbides, titanates, zirconates, and cerates , citrate, citrate, citrate, ferrite, stannate, chromate; including elemental boron, carbon, silicon, selenium, tellurium, antimony, bismuth, antimony, tin, lead, aluminum, Elemental powders of gallium, indium, zinc, cadmium, copper, nickel, cobalt, iron, manganese, chromium, molybdenum, tungsten, vanadium, niobium, tantalum, titanium, zirconium, hafnium, rare earth elements or metal powders or oxides or hydroxides , silicon carbide, aluminum carbide, boron carbide, titanium carbide, vanadium carbide, zirconium carbide, tungsten carbide, iron carbide, chromium carbide, manganese carbide, zirconium titanate, zinc titanate, barium titanate, barium titanate, titanic acid Tin, lead titanate, zinc zirconate, barium zirconate, barium zirconate, tin zirconate, lead zirconate, lead citrate, zinc citrate, lead citrate, zinc citrate, lead citrate, zinc citrate, Lead citrate, zinc citrate, ferrite, lead ferrite, zinc ferrite, iron Manganese, bismuth stannate, lead stannate, zinc, tin, manganese, tin, lead chromate pigments, and mixtures or compounds or complexes between them. The above mixture includes an alloy obtained by mixing two or more kinds of metal powders or two or more kinds of metals and non-metal powders by mechanical alloying; in the process of mechanical alloying, aluminum phosphate is simultaneously added, It is a good way to improve product quality and save cost by pulverizing and de-polymerizing aluminum alloy while grinding.

The seventh discovery of the present invention is to find a method for preparing a coated powder by de-agglomerating and coating aluminum phosphate under mechanical action or mechanochemistry, and the product quality is good, the particles are finely homogenized, and the particle morphology is in most cases. It is spherical or rounded, has good fluidity, is easy to disperse in the medium, does not produce excess reaction products, does not require high temperature heat treatment, does not require washing, filtration and drying processes, saves energy, saves chemical reagents, saves water, no The three wastes, low cost, highlight the advantages of the present invention. The products of the first and second technical solutions of the product of the invention can be prepared by the first technical solution of the preparation method of the invention, wherein a part of the products can also be combined with the third and fourth technical solutions of the product of the invention. As with the product, the second technical solution of the preparation method of the present invention is more easily prepared. The difference between the technical solutions of the two preparation methods in carrying out the process of de-agglomerating and coating aluminum phosphate while pulverizing is: In the first scheme, it is divided into two steps, first pulverizing with acid-base reaction, and then pulverizing. In the second solution, the coating is carried out in one step. In the second solution, the acid-base reaction is pulverized and depolymerized and coated, or the mechanical alloy is pulverized and depolymerized and coated, or only the side is crushed. Poly-edge coating.

In the technical solution of the two preparation methods of the present invention, most of the compounds are added in powder form, and if necessary, a small amount of concentrated solution such as concentrated phosphoric acid and a coupling agent may be added, and the material is not required to be dried and dehydrated in advance, and no water is added in the whole process. The principle is not to cause the powder to agglomerate and agglomerate. In the regulation of the atomic ratio of aluminum to phosphorus, pentoxide Diphosphorus is easily deliquescent and requires measures to keep it dry. Concentrated phosphoric acid tends to cause the material to coalesce into clumps, preferably in the form of a spray. The compound added in any of the steps may be premixed and added, or even pre-mixed and ground, and then added, which facilitates uniform distribution of the coating compound and participates in the reaction.

The mixing of the powder can be carried out in a mixer or a kneader; the mechanochemical reaction, pulverization, depolymerization and coating of the powder can be carried out in a ball mill, a planetary ball mill, a stirring mill, a vibration mill, a vortex mill, a jet mill, etc. Complete in a superfine pulverizing equipment. In the laboratory, the entire process can be completed with a simple mortar and a balance.

The product preparation process and experimental research process can be carried out at room temperature above o °c, but as mentioned above, it is more advantageous to raise the temperature at a temperature less than i io °c, as long as the water is not exhausted, leave a little Adsorb water or crystal water. On the other hand, the material can also be preheated after being uniformly mixed in the first step, and then placed in the pulverizing apparatus. For materials that release lattice water during the reaction, it is more necessary to heat up and remove most of the water released. The pulverization and depolymerization coating can be easily carried out.

After pulverization and depolymerization coating, the product can be aged for a period of time, and the aging is beneficial to distribute the coating more evenly on the surface of the powder, and the aging time should be more than 8 hours. Since then, some products can be packaged for sale directly, and some products still have water that needs to be heated to drive away. On the other hand, after pulverization and depolymerization coating, proper heating facilitates the orderly arrangement of the aluminum phosphate molecules in order to improve the firmness of the envelope and the reflectivity of the light. The aluminum phosphate is slowly heated at a heating temperature of 70 ° C or higher. From the amorphous state to the crystalline state, the crystal transition speed is accelerated at about 150 °C; when the heating temperature is low, the time required for the crystal transition is long, and vice versa. For heat-labile powders, such as iron yellow pigments, it is necessary to heat at a relatively low temperature for 30-100 minutes; inorganic pigments are generally heated at 70 ° C to 13 CTC; non-pigment powders are suitable for use at 110 ° C to 18 CTC Heating for 10-20 minutes; in the case of adding a solvation segment, it is generally not more than 200 °C.

The eighth finding of the present invention is that it is found that a solvating compound can be added during the powder coating process to react to form a solvation segment having affinity for the dispersion medium, anchored on the surface of the powder, and the powder is increased in the medium. Dispersion. Another function of the solvation segment is to strengthen the connection fastness between the powder and the medium, and the entanglement between the solvated segment and the polymer such as rubber and plastic, which is beneficial to improve the impact resistance of the plastic and the wear resistance of the rubber and the coating. The entanglement between the solvated segments and the paper textile fibers helps to increase the residence rate of the powder on the fibers. The solvation segment is directly anchored to the surface of the powder by the reactive group, or indirectly or partially anchored to the surface of the powder through an aluminum phosphate coating, for example, a fatty acid, a silane coupling agent, or a polysiloxane can be chemically reacted. Directly anchored on the surface of the powder, also with aluminum phosphate The aluminum atoms in the envelope react indirectly to anchor on the surface of the powder; for example, polyethylene glycol is anchored on the phosphorus atom and the like. Compounds that can provide solvated segments are referred to as solvated compounds. A solvating segment can be derived from a solvating compound or from the reaction product of a solvating compound with another solvating compound.

The solvating compound is at least one selected from the group consisting of a fatty acid, a fatty alcohol, an aromatic compound, a resinous acid compound, a rosin acid compound, an olefin compound, an organic amine, a polyether compound, a polyester compound, a polysulfone compound, a polysiloxane. , modified polysiloxane, silane coupling agent, titanate coupling agent, aluminate coupling agent, phosphate coupling agent, borate coupling agent, including fatty acid, hydroxy fatty acid, alkyl amino acid , a fatty monohydric alcohol, ethylene glycol, a fatty diol, an alkyl quaternary ammonium compound, an alkyl phenol, an alkyl naphthol, an alkyl aromatic carboxylic acid, a resinic acid, a rosin acid, a hydrogenated abietic acid, a polymeric rosin acid, Uneven rosin acid, allyl alcohol, allylamine, acrylamide, acrylonitrile, acrylic acid, methacrylic acid, melamine, triaminopyrimidine, diphenylaminoethane, cyclohexylamine, tripropylamine, tributylamine, Triamylamine, trihexylamine, triheptylamine, trioctylamine, triphenylamine, trinaphthylamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, hexamethylene Amine, amino terminated polyether, polyether diol, trihydroxy polyether polyol, polyether polysiloxane, polydimethylsiloxane, hydrogen containing polysiloxane, pentaphenyl trimethylsilane Oxane, polymethylphenylsiloxane, alkenylsilane, aminoalkylsilane, ^^bis(3-hydroxyethyl)^-aminopropyltriethoxysilane, hydroxyalkylsilane, epoxyalkylsilane , methacryloxyhydrocarbylsilane, alkoxy oxyethylaminosilane, azidoalkylsilane, diazohydrocarbylsilane, anthracenylsilane, organosilane polysulfide, and the like. In aqueous systems, the general solvating compounds are polyethylene glycols, polyether compounds; in hydrophobic dispersion media, the general solvating compounds are C8+ fatty acid, aluminate coupling agents. In rubber, the special solvating compound is an organosilane polysulfide.

The weight ratio of the solvation segment to the aluminum phosphate coating layer is 0.03 : 1 to 1 : 1 _{; in} general, it is 0.12 : 1 to 1 : 1, the solvation segment is excessive, the powder particles are easy to stick The ratio is reduced to 0.03 : 1 to 0. 12 : 1 , in the case of the olefinic compound as a solvating segment.

The aluminum phosphate coating powder of the invention mainly has the following uses:

1) Used as a filler, a reinforcing agent, and an adsorption carrier for rubber, plastics, resins, sealants, adhesives, paints, coatings, inks, stationery, household chemicals, paper, and textiles.

2) As a filler, rheological agent applied to inks, paints, coatings, household chemicals, lubricants, Drilling mud.

3) Used as a powder material in ceramics, refractory materials, magnetic materials, electronic materials, electromagnetic wave shielding materials, and building materials.

4) Used as a coloring agent in inks, paints, coatings, plastics, rubber, resins, ceramics, stationery, household chemicals, paper, textiles. The advantages of the aluminum phosphate coating powder of the invention are mainly as follows:

1. The particles are refined and homogenized. The limit of the mechanically pulverized powder alone was 500 nm, and the coated aluminum hydroxide (Example 9) prepared by the present invention had an average particle diameter of less than 100 nm and a particle size distribution of 乍.

2. Easy to disperse and easy to process. For example, the nano-iron oxide red pigment is sufficiently dispersed in the paint to be ground for 12 hours, and the energy consumption and mechanical abrasion are large. After the preparation of the present invention (Example 8), the grinding time is shortened to 5 hours under the same conditions.

3. Improved liquidity. For example, after silica was prepared by the present invention (Example 5), the area of the circle obtained by the fluidity test was doubled.

4. Increased tinting strength. For example, anatase type titanium dioxide is prepared by the present invention (Example 6), and the coloring power is increased by 15%, at the same time, powdering resistance and weather resistance are increased.

5. Reduce the sintering temperature. For example, after alumina is prepared by the present invention (Example 10), the sintering temperature can be lowered to about 170 CTC.

The invention overcomes the weakness of the current preparation of nano powder materials, is not easy to disperse, and has poor fluidity, and opens a way for the popularization of nano powder materials. The invention will be further clarified by the specific examples given below, but they are not intended to limit the invention. In the following examples, the aluminum phosphate added was of the formula A1P04, and the silica was all precipitated silica, and the concentration of concentrated phosphoric acid was 85%. Embodiments 1 to 4 belong to the first technical solution of the product of the present invention, and Embodiments 5 to 8 belong to the second technical solution of the product of the present invention, and Embodiments 9 to 12 belong to the third technical solution of the product of the present invention. 13 to 18 belong to the fourth aspect of the product of the present invention, wherein Example 18 shows that the mechanical alloying process and the aluminum phosphate coating process are combined into one process, and the aluminum alloy is coated with aluminum phosphate while being pulverized and decomposed. Example 1

The granules were pulverized in a mechanical pulverizing apparatus and a solid phase acid-base reaction was carried out, and then 13.1 g of aluminum phosphate was added, and the mixture was again pulverized and depolymerized, and dried under 15 CTC. The obtained aluminum phosphate coated mullite is used as a powder material in refractory materials and ceramic materials. Example 2

。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。 g, again mixed and pulverized depolymerized coating, dried under 11CTC, and the obtained aluminum phosphate coated zinc stannate is used as a flame retardant in plastics and rubber. Example 3

Take zinc oxide 100g, kaolin 159g, concentrated phosphoric acid 81.6ml, stearyl alcohol 1 1. lg, mix evenly, heat at 11CTC for 30 minutes, then pulverize in a mechanical pulverizing equipment and react with a solid phase acid-base reaction. Depolymerization coating, drying under licrc, a mixture of zinc phosphate and kaolin in the obtained aluminum zinc phosphate coating is used as a new generation of anti-rust pigment in paints. Example 4

Take 100g of ferric oxide, 50g of nickel oxide, 30g of zinc oxide, mix well, pulverize and solid phase acid-base reaction in mechanical pulverizing equipment, add 6g of aluminum phosphate, mix and pulverize and depolymerize and coat, and dry at 15CTC. The obtained aluminum phosphate coated zinc ferrite is used as a soft ferrite in the magnetic material. Example 5

5克的双三乙氧。 50g of precipitated silica, aluminum hydroxide 7. 2g, uniformly mixed, placed in a mechanical pulverization equipment and pulverized and solid phase acid-base reaction, and then added 12.2g, a concentration of 50% of the double triethoxy a silyl propyl tetrasulfide (Si 69) silane coupling agent 5. 25ml, lauric acid 2. 8g, remixed and pulverized depolymerized coating, dried at 15CTC, the obtained core is silicon oxide, and the outer shell is silicon. The aluminum phosphate coated aluminum powder is used as a reinforcing agent in tire rubber. Example 6

The anatase titanium dioxide 100g, aluminum hydroxide 7. 2g, aluminum phosphate 0. 92g, mixed evenly, pulverized in a mechanical pulverizing equipment and a solid phase acid-base reaction, at the same time depolymerization coating, drying at 13CTC, The obtained core is titanium dioxide, aluminum phosphate coated powder with aluminum titanate as white pigment for ink, paint, paint, plastic, rubber, resin, stationery, household chemicals, toothpaste, paper, textiles, ceramics. in. Example 7

The oxidized iron-base reaction was carried out in a mechanical pulverization apparatus, and the solid phase acid-base reaction was carried out, and then aluminum phosphate was added 1. 4 g; the mixture was again pulverized and depolymerized, and baked under 8 CTC. Dry, the obtained core is iron oxide yellow, and the aluminum phosphate coating pigment with outer shell is used in the coating. Example 8

The iron oxide red pigment 100g, silica 4.7g, mixed evenly, pulverized in a mechanical pulverizing equipment and solid phase acid-base reaction, and then added aluminum phosphate 1. 19g, remixed and pulverized depolymerized coating, baked under 13CTC Dry, the obtained core is iron oxide red, and the aluminum phosphate coating pigment with outer shell is used in the coating. Example 9

Taking 100 g of aluminum hydroxide, 0. 34 g of boric acid, 0.9 ml of concentrated phosphoric acid, 1. 8 g of stearic acid, uniformly mixed, pulverized in a mechanical pulverizing apparatus and subjected to a solid phase acid-base reaction, at the same time, depolymerized and coated, 1 1CTC drying, the obtained aluminum phosphate boron coated aluminum hydroxide powder as a flame retardant and reinforcing agent used in plastics, rubber, resin, paint, paint. Example 10

Take 100g of alumina, 1.5ml of concentrated phosphoric acid, mix evenly, pulverize in a mechanical pulverizing equipment and produce a solid-phase acid-base reaction, at the same time depolymerization coating, drying under l icrc, the obtained aluminum phosphate coating Alumina powder is used as a powder material in a refractory material. Example 11

100 g of kaolin, 10 ml of concentrated phosphoric acid, 5 g of silica, 2.4 g of stearyl alcohol, uniformly mixed, heated at 110 ° C for 60 minutes, and then pulverized in a mechanical pulverizing apparatus and reacted with a solid phase acid-base reaction. Depolymerization coating, drying under licrc, the obtained aluminum phosphate coating powder of kaolin and silica is used in paint and cable materials. Example 12

Take 100g of kaolin, 1.18g of magnesia, 11ml of concentrated phosphoric acid, 5g of silica, 1ml of polyethylene glycol 300, mix well, heat at 110 ° C for 30 minutes, then pulverize in mechanical pulverizing equipment and produce solid phase acid The alkali reaction, at the same time, depolymerization coating, drying under licrc, the obtained aluminum phosphate coating powder of kaolin and silica is used in paper coatings and fillers, waterborne coatings. Example 13

Take a metal aluminum powder 100g, add 1. 6g of aluminum dihydrogen phosphate, aluminate coupling agent 0. 75g, mix and pulverize and depolymerize at room temperature and argon atmosphere, and dry at 110 ° C and argon atmosphere The obtained aluminum phosphate powder of the metal aluminum powder is used as a floating aluminum powder pigment. Example 14

The granules of the precipitated silica were added, and the aluminum phosphate was added in an amount of llg, 7.5 g of aluminum hydroxide, 7.5 g of hydrogen peroxide, 2 ml of hydrogen peroxide polysiloxane, and 275 pentaphenyl trimethylsiloxane 0. 5 ml. Drying at 15 CTC, the obtained aluminum phosphate coated silica is used as an adsorbent for filtering aromatic harmful gases. Example 15

The smectite-based bentonite 100g, the addition of aluminum phosphate 12g, aluminum hydroxide 7.6g, stearic acid 4. 5g, evenly mixed, pulverized and depolymerized in a mechanical pulverizing equipment, dried under 11CTC The bentonite powder obtained by the aluminum phosphate coating is used as a filler in plastics and rubber. Example 16

6毫升的氯三乙。 Take a nanometer aluminum nitride 100g, add aluminum phosphate 2. 4g, hydrogen-containing polysiloxane 0. 6ml, vinyl triethyl Oxysilane coupling agent (A151) 0. 2ml, mixed pulverization depolymerization coating, drying at 15CTC, aluminum nitride coated aluminum nitride as a high thermal conductivity powder material, used for electrically insulating paste Ultra high thermal conductivity nanocomposite silica gel. Example 17

Take 100g of silicon carbide, add 1.14g of aluminum hydroxide, 1. 8g of aluminum phosphate, mix and pulverize and depolymerize at room temperature and argon atmosphere, and dry under 7CTC and argon atmosphere, and obtain the aluminum phosphate coating. Silicon carbide is used in refractory materials. Example 18

The metal iron powder 90g, the metal zirconium powder 7g, the elemental boron powder 3g, mixed pulverized and depolymerized at room temperature and argon atmosphere, and then added aluminum phosphate 0. 8g; remixed and pulverized depolymerized coating, at 7CTC and argon It is dried under a gas atmosphere to obtain an aluminum phosphate-coated iron-zirconium-boron alloy, which is used as a soft magnetic material.

Claims

Claim

1. A coated powder characterized by an inorganic content produced by a solid phase acid-base reaction of a core selected from two or more compounds selected from the group consisting of oxides, hydroxides, and solid inorganic oxyacids by mechanochemistry Oxygen salt composition; The surface coating is composed of aluminum phosphate by de-agglomeration while pulverizing, wherein the atomic ratio of aluminum to phosphorus is 0.33:1 to 3:1, and the aluminum atom may be partially boron, iron, antimony, The zinc, magnesium, and calcium atoms are substituted, and the total number of substituted atoms is less than the number of aluminum atoms.

2. The coated powder according to claim 1, wherein said oxide, hydroxide, solid inorganic oxyacid, inorganic oxy salt is characterized in that at least one of them is selected from the group consisting of phosphorus, arsenic, antimony, bismuth, Silicon, germanium, tin, lead, boron, aluminum, gallium, indium, zinc, cadmium, copper, nickel, cobalt, iron, manganese, chromium, molybdenum, tungsten, vanadium, niobium, tantalum, titanium, zirconium, hafnium, alkaline earth metal And an oxide or hydroxide of a rare earth element, and a solid inorganic oxyacid or inorganic oxygen salt derived therefrom; wherein at least one of the solid inorganic oxyacids is selected from the group consisting of aluminum dihydrogen phosphate, aluminum dihydrogen phosphate, Phosphorous acid, boric acid, molybdic acid, tungstic acid, phosphomolybdic acid, phosphotungstic acid, metatitanic acid.

3. A coated powder characterized in that the inner core is composed of one or more oxides or hydroxides, and the outer shell comprises the above compound and an oxide selected from the group consisting of oxides, hydroxides, solid inorganic oxyacids, and concentrated phosphoric acid. The other compound or compounds are composed of an inorganic oxygen-containing salt formed by solid-phase acid-base reaction under the action of mechanochemistry; the surface coating is composed of aluminum phosphate by de-agglomeration while being pulverized, wherein aluminum and phosphorus are The atomic ratio is 0.33 : 1 to 3 : 1 , and the aluminum atom may be partially substituted by boron, iron, lanthanum, zinc, magnesium, and calcium atoms, and the total number of substituted atoms is less than the number of aluminum atoms.

4. The coated powder according to claim 2, wherein said oxide, hydroxide, solid inorganic oxyacid, inorganic oxygenate is characterized in that at least one of them is selected from the group consisting of phosphorus, arsenic, antimony, antimony, Silicon, germanium, tin, lead, boron, aluminum, gallium, indium, zinc, cadmium, copper, nickel, cobalt, iron, manganese, chromium, molybdenum, tungsten, vanadium, niobium, tantalum, titanium, zirconium, hafnium, alkaline earth metal And an oxide or hydroxide of a rare earth element, and a solid inorganic oxyacid or inorganic oxygen salt derived therefrom; wherein at least one of the solid inorganic oxyacids is selected from the group consisting of aluminum dihydrogen phosphate, aluminum dihydrogen phosphate, Phosphorous acid, boric acid, molybdic acid, tungstic acid, phosphomolybdic acid, phosphotungstic acid, metatitanic acid.

5. A coated powder, characterized in that the inner core is composed of an aluminum-containing compound, at least one of which is selected from the group consisting of alumina, aluminum hydroxide, aluminate, aluminosilicate, clay mineral; surface coating is pulverized by side The method of encapsulating while depolymerizing is carried out by mechanochemical action of one or more compounds selected from the above aluminum-containing compounds and selected from phosphorus pentoxide, concentrated phosphoric acid, phosphorous acid, aluminum dihydrogen phosphate, and aluminum dihydrogen phosphate. Aluminium phosphate formed by solid-phase acid-base reaction, wherein the atomic ratio of aluminum to phosphorus is 0.33:1 to 3:1, and the aluminum atom may be partially substituted by boron, iron, bismuth, zinc, magnesium, and calcium atoms, and the total number of substituted atoms Less than the number of aluminum atoms.

6. A coated powder, characterized in that the inorganic powder is formed into a coated powder by de-agglomerating while being pulverized, and the coating is composed of aluminum phosphate, wherein an atomic ratio of aluminum to phosphorus is at least one The powder selected from the group consisting of a basic oxide, an alkali hydroxide, a metal powder, and a weak acid strong base inorganic salt has a surface of 0.3 3 : 1 to 0.67 : 1, in an amphoteric oxide, an amphoteric hydroxide, a phosphate, The surface of the near-neutral inorganic salt powder such as strong acid strong base salt, weak acid weak base salt is 0.65 : 1 to 1.35 : 1, on the surface of the acidic oxide, strong acid weak base inorganic salt powder is 1.3 : 1 to 3: 1, at least one alloy, inorganic coating powder selected from the group consisting of silicates, aluminosilicates, clay minerals, silicides, nitrides, carbides, sulfides, metals and metals or metals and non-metals The mixture of the body and the above various substances or the powder of the compound or composite has a surface of 0.3 3 : 1 to 3 : 1, and the aluminum atom may be partially substituted by boron, iron, ruthenium, zinc, magnesium or calcium atoms. The total number of atoms is less than aluminum The number of child.

7. The coated powder according to claim 6, wherein the inorganic powder is formed into a coating powder by deagglomerating and coating while being pulverized, and the coating is composed of aluminum phosphate, wherein an atomic ratio of aluminum to phosphorus 0.3 3 : 1 to 0.67 : 1 on the surface of at least one powder selected from the group consisting of basic oxides, alkaline hydroxides, and metal powders; 0.65 : 1 to 1.35 : 1 on the surface of the phosphate powder , on the surface of the acidic oxide powder, 1.3:1 to 3:1, at least one selected from the group consisting of silicates, aluminosilicates, clay minerals, silicides, nitrides, inorganic coating powders, and the like The mixture between the substances or the powder of the compound or composite has a surface of 0.3 3 : 1 to 3 : 1 .

The coated powder according to claim 6, wherein said inorganic powder is characterized in that they are at least One selected from the group consisting of alkaline oxides, alkaline hydroxides, metal powders, phosphates, acidic oxides, silicates, aluminosilicates, clay minerals, silicides, nitrides, inorganic coated powders; Including zinc, aluminum, lead, rare earth oxides or hydroxides, aluminum powder, silver powder, gold powder, cobalt powder, chromium powder, copper powder, iron powder, manganese powder, molybdenum powder, niobium powder, nickel powder, lead powder , tin powder, tantalum powder, titanium powder, tungsten powder, zinc powder, zirconium powder, rare earth element powder, apatite, calcium phosphate, magnesium phosphate, zinc phosphate, silicon oxide, diatomaceous earth, cerium oxide, cerium oxide, oxidation Zirconium, chromium oxide, molybdenum oxide, tungsten oxide, tin oxide, wollastonite, hydrated calcium silicate, hydrated aluminum silicate, glass beads, glass short fibers, zircon, lead silicate, expanded perlite powder, long Stone, phyllite, red mud, silica-alumina, fly ash, oil shale ash, mullite, tourmaline, attapulgite, palygorskite, sepiolite, talc, pyrophyllite, high Ling stone, calcined kaolinite, smectite, earthworm , molybdenum silicide, zirconium silicide, titanium silicide, silicon nitride, boron nitride, gallium nitride, titanium nitride, zirconium nitride, aluminum nitride, inorganic coated lead chromate pigment, and mixtures thereof or a compound or complex.

The coated powder according to claim 6, wherein said inorganic powder is characterized in that at least one of them is selected from the group consisting of elemental powders, metal powders, oxides, hydroxides, carbides, titanates, zirconates Salt, citrate, citrate, citrate, citrate, ferrite, stannate, chromate; including elemental boron, carbon, silicon, selenium, tellurium, antimony, bismuth, antimony, tin , lead, aluminum, gallium, indium, zinc, cadmium, copper, nickel, cobalt, iron, manganese, chromium, molybdenum, tungsten, vanadium, niobium, tantalum, titanium, zirconium, hafnium, rare earth elemental powder or metal powder or Oxide or hydroxide, silicon carbide, aluminum carbide, boron carbide, titanium carbide, vanadium carbide, zirconium carbide, tungsten carbide, iron carbide, chromium carbide, manganese carbide, zirconium titanate, zinc titanate, barium titanate, titanium Barium acid, tin titanate, lead titanate, zinc zirconate, barium zirconate, barium zirconate, tin zirconate, lead zirconate, lead citrate, zinc citrate, lead citrate, zinc citrate, lead citrate , zinc citrate, lead citrate, zinc citrate, ferrite, ferric acid , Zinc ferrite, manganese ferrite, bismuth stannate, lead stannate, zinc, tin, manganese, tin, lead chromate pigments, and mixtures or compounds or complexes between them.

A dry preparation method of an aluminum phosphate coated powder, characterized in that the method consists of the following sequential steps:

(1) one or more compounds selected from the group consisting of an acidic oxide, an acid hydroxide, a solid inorganic oxyacid, and a concentrated phosphoric acid, and a compound selected from the group consisting of a basic oxide, an alkali hydroxide, and an inorganic oxygen salt Adding one or more other powders together and mixing them evenly; (2) grinding and pulverizing powder particles, and causing solid-phase acid-base reaction between the powders under mechanical chemistry to be converted into inorganic oxygen-containing salt powder, or the outer shell is an inorganic oxygen-containing salt, and the inner core is an oxide or hydrogen. a composite powder of an oxide or another inorganic oxygen salt;

(3) adding one or more compounds selected from the group consisting of aluminum hydroxide, aluminum phosphate, phosphorus pentoxide, concentrated phosphoric acid, phosphorous acid, aluminum dihydrogen phosphate, and aluminum dihydrogen phosphate, at 0.33:1 to 3:1 To modulate the atomic ratio of aluminum to phosphorus in these compounds, with or without the addition of a solvating compound as a source of solvated segments on the surface of the powder, continue grinding, pulverizing, and coating the powder particles in a powder state, Powder of aluminum phosphate coating;

(4) Heat at 70 ° C to 200 ° C for 10 minutes to 100 minutes.

11. A dry preparation method of an aluminum phosphate coated powder, characterized in that the method consists of the following sequential steps:

(1) adding, in the inorganic powder, one or more compounds selected from the group consisting of aluminum hydroxide, aluminum phosphate, phosphorus pentoxide, concentrated phosphoric acid, phosphorous acid, aluminum dihydrogen phosphate, and aluminum dihydrogen phosphate. The atomic ratio of aluminum to phosphorus that regulates these compounds in the range of 0.33 : 1 to 3 : 1 , with or without solvated compounds as a source of solvated segments of the powder surface, mixed, pulverized, depolymerized, Coating powder particles;

(2) Heat at 70 ° C to 200 ° C for 10 to 100 minutes.