CN116218258A - Low-grade talcum powder and preparation method and application thereof - Google Patents

Low-grade talcum powder and preparation method and application thereof Download PDF

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Publication number
CN116218258A
CN116218258A CN202310242052.9A CN202310242052A CN116218258A CN 116218258 A CN116218258 A CN 116218258A CN 202310242052 A CN202310242052 A CN 202310242052A CN 116218258 A CN116218258 A CN 116218258A
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talcum powder
grinding
diameter
modifier
low
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徐永华
吴维冰
邹检生
温云祥
贺欣欣
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Haicheng Xinguangyuan Powder Material Co ltd
Jiangxi Guangyuan Chemical Co Ltd
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Haicheng Xinguangyuan Powder Material Co ltd
Jiangxi Guangyuan Chemical Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
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    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/28—Compounds of silicon
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    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
    • C09C3/006—Combinations of treatments provided for in groups C09C3/04 - C09C3/12
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
    • C09C3/04—Physical treatment, e.g. grinding, treatment with ultrasonic vibrations
    • C09C3/041—Grinding
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
    • C09C3/08—Treatment with low-molecular-weight non-polymer organic compounds
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    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
    • C09C3/12—Treatment with organosilicon compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K9/00—Use of pretreated ingredients
    • C08K9/04—Ingredients treated with organic substances
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K9/00—Use of pretreated ingredients
    • C08K9/04—Ingredients treated with organic substances
    • C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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Abstract

The invention belongs to the technical field of nonmetallic ore preparation, and provides low-grade talcum powder, a preparation method and application thereof, wherein the preparation method comprises the following steps: mixing talcum powder and grinding agent solution, and ball milling to obtain intermediate product; and mixing the intermediate product with a modifier solution for reaction to obtain the low-grade talcum powder. According to the invention, the fineness of talcum powder is controlled, so that talcum powder and grinding aid solution are better fused, the grinding efficiency is improved, meanwhile, as the fineness is thinned, the grinding treatment of grinding is not needed in the ball mill, so that the proportion of grinding media with small particle size in the ball mill can be improved, the grinding efficiency is further improved, the oil absorption of a product is reduced through surface modification treatment, and the compatibility with downstream resin is improved. The talcum powder prepared by the invention is applied to an economic building coating formula, can completely replace kaolin in the formula, gives consideration to the hiding power and the washing resistance of a coating film, and obviously reduces the formula cost.

Description

Low-grade talcum powder and preparation method and application thereof
Technical Field
The invention relates to the technical field of nonmetallic ore preparation, in particular to low-grade talcum powder and a preparation method and application thereof.
Background
Talc is a common silicate mineral material, is one of mineral materials known in nature and has the lowest hardness, and has a series of characteristics of lubricity, fire resistance, acid resistance, insulativity, high melting point, chemical inactivity, good hiding power, softness, good luster, strong adsorption power and the like. However, the existing talcum powder has high processing cost and severely limits the use of the talcum powder. Therefore, how to achieve the ultrafine talc under low-cost processing conditions has been one of the problems that the industry is urgent to solve.
In an economical building coating formula, in order to reduce the formula cost and reduce the consumption of titanium pigment, a large amount of calcined kaolin is often added to improve the hiding power, but because the calcined kaolin has larger oil absorption, the influence on the washing resistance of a coating film is larger, the content of emulsion is required to be additionally improved to improve the washing resistance, the formula cost is increased virtually, and the effect on reducing the formula cost after the two are mutually offset is not obvious. Therefore, it is one of the difficulties in industry to compromise the hiding power and the wash resistance of the coating film with reduced formulation costs.
Disclosure of Invention
The invention aims to provide low-grade talcum powder and a preparation method and application thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a preparation method of low-grade talcum powder, which comprises the following steps:
(1) Mixing talcum powder with an abrasive solution, and ball milling to obtain an intermediate product;
(2) And mixing the intermediate product with a modifier solution for reaction to obtain the low-grade talcum powder.
Preferably, the talc has a D50 of 16 to 18. Mu.m.
Preferably, the abrasive solution comprises an abrasive and water; the mass volume ratio of the grinding agent to the water is 1g: 5-10 mL.
Preferably, the abrasive comprises sodium polycarboxylate and polyvinyl alcohol; the mass ratio of the sodium polycarboxylate to the polyvinyl alcohol is 1-3: 1, a step of; the mass of the grinding agent is 3-7 per mill of the mass of talcum powder.
Preferably, the ball milling medium comprises a steel ball with the diameter of 5-15 mm, a steel ball with the diameter of 18-25 mm and a steel ball with the diameter of 35-45 mm; the mass ratio of the steel ball with the diameter of 5-15 mm to the steel ball with the diameter of 18-25 mm to the steel ball with the diameter of 35-45 mm is 2-4: 2 to 4:3 to 5; the medium filling rate of the ball milling is 30-40%; the ball milling time is 30-45 min.
Preferably, the modifier solution in step (2) comprises a modifier and water; the mass volume ratio of the modifier to the water is 1g: 1-3 mL; the mass of the modifier is 5-10 per mill of that of talcum powder.
Preferably, the modifier comprises methacrylic acid and methacryloxy silane; the mass ratio of the methacrylic acid to the methacryloxy silane is 3-5: 1.
preferably, the temperature of the mixing reaction in the step (2) is 100-120 ℃; the time of the mixing reaction is 30-40 min.
The invention also provides low-grade talcum powder obtained by the preparation method.
The invention also provides application of the low-grade talcum powder in building paint.
The invention has the following advantages:
the invention provides a preparation method of low-grade talcum powder, which comprises the following steps: mixing talcum powder with an abrasive solution, and ball milling to obtain an intermediate product; and mixing the intermediate product with a modifier solution for reaction to obtain the low-grade talcum powder.
According to the invention, the fineness of talcum powder is controlled, so that talcum powder and grinding aid solution are better fused, the grinding efficiency is improved, and meanwhile, as the fineness is thinned, the grinding treatment of grinding is not needed in the ball mill, so that the proportion of small-particle-size grinding media in the ball mill can be improved, the grinding efficiency is further improved, and compared with the traditional process for producing superfine talcum powder, the production energy consumption is greatly reduced.
The invention also provides application of the low-grade talcum powder in building paint. The invention selects low-grade talcum with 20-30% of silicon dioxide as raw ore, which reduces oil absorption while taking grindability into account. The oil absorption of the product is further reduced through surface modification treatment, the compatibility with downstream resin is improved, and the modified polyurethane can be applied to an economic building coating formula, can completely replace kaolin in the formula, has the covering power and the washing resistance of a coating film, and obviously reduces the formula cost.
Drawings
FIG. 1 is a schematic flow chart of embodiment 1.
Detailed Description
The invention provides a preparation method of low-grade talcum powder, which comprises the following steps:
(1) Mixing talcum powder with an abrasive solution, and ball milling to obtain an intermediate product;
(2) And mixing the intermediate product with a modifier solution for reaction to obtain the low-grade talcum powder.
In the invention, talcum powder particles are obtained after the raw talcum ore is washed, dried and crushed in two sections E Shi, and the talcum powder particles are put into a ring roller mill for coarse grinding, and are obtained after grading and collecting.
In the present invention, the silica content of the talc raw ore is preferably 20 to 30%, more preferably 23 to 27%, and still more preferably 24 to 26%.
In the invention, the talcum ore with the silicon dioxide content of 20-30 percent has higher hardness and excellent grindability, the low-grade talcum powder prepared by using the talcum ore has lower oil absorption, and the product has smaller influence on the washing resistance of a coating film when being applied downstream.
In the present invention, the diameter of the talc particles is preferably 10 to 30mm, more preferably 15 to 25mm, and even more preferably 18 to 22mm.
In the present invention, the talc powder in step (1) preferably has a D50 of 16 to 18. Mu.m, more preferably 16.5 to 17.5. Mu.m, still more preferably 16.8 to 17.2. Mu.m.
According to the invention, the material with the talcum powder D50 of 16-18 mu m is selected, so that the grinding step in front of a traditional ball mill can be reduced, the ball mill is not required to be divided into bins, and the whole bin is directly subjected to superfine grinding, thereby being beneficial to improving the grinding efficiency of the material.
In the present invention, the abrasive solution comprises an abrasive and water.
In the present invention, the mass to volume ratio of the abrasive to water is preferably 1g:5 to 10mL, more preferably 1g:6 to 9mL, more preferably 1g: 7-8 mL.
In the present invention, the abrasive comprises sodium polycarboxylate and polyvinyl alcohol.
In the invention, the mass ratio of the sodium polycarboxylate to the polyvinyl alcohol is preferably 1-3: 1, more preferably 1.2 to 2.8:1, more preferably 1.5 to 2.5:1.
in the present invention, the mass of the abrasive is preferably 3 to 7% by mass, more preferably 4 to 6% by mass, and still more preferably 4.5 to 5.5% by mass of talc.
In the present invention, an abrasive solution is added during the conveying of talc by the spiral reamer.
In the present invention, the addition of the abrasive solution is preferably performed by spraying.
In the present invention, talc and abrasive solution are fed into a high-speed mixer via a spiral reamer for mixing.
In the invention, the high shearing force of the high-speed mixer is utilized to ensure that the grinding aid is in full and uniform contact with talcum powder coarse powder, thereby effectively avoiding the defect that the grinding aid cannot be fully and uniformly mixed in the spiral reamer due to the fact that the talcum powder has smaller autogenous bulk specific gravity and fluffy materials.
In the present invention, the mixing time is preferably 10 to 20 minutes, more preferably 12 to 18 minutes, and still more preferably 14 to 16 minutes.
In the invention, the ball milling is carried out in the next step after the mixing of the high-speed mixer is finished.
In the present invention, the ball milling machine is preferably a single-bin ball mill.
In the present invention, the ball bin volume of the single bin ball mill is preferably 1.83×7.2m.
In the present invention, the ball-milling medium preferably comprises a steel ball having a diameter of 5 to 15mm, a steel ball having a diameter of 18 to 25mm, and a steel ball having a diameter of 35 to 45mm, more preferably comprises a steel ball having a diameter of 8 to 12mm, a steel ball having a diameter of 20 to 23mm, and a steel ball having a diameter of 38 to 42mm, still more preferably comprises a steel ball having a diameter of 9 to 11mm, a steel ball having a diameter of 21 to 22mm, and a steel ball having a diameter of 39 to 41 mm.
In the invention, the small-size steel ball is selected for superfine grinding, so that the grinding efficiency can be further improved.
In the invention, the mass ratio of the steel balls with the diameters of 5-15 mm to the steel balls with the diameters of 18-25 mm to the steel balls with the diameters of 35-45 mm is preferably 2-4: 2 to 4:3 to 5, more preferably 2.2 to 3.8:2.2 to 3.8:3.5 to 4.5, more preferably 2.5 to 3.5:2.5 to 3.5:3.8 to 4.2.
In the present invention, the medium filling rate of the ball mill is preferably 30 to 40%, more preferably 35 to 45%, and even more preferably 38 to 42%; the ball milling time is preferably 30 to 45 minutes, more preferably 35 to 40 minutes, and still more preferably 37 to 38 minutes.
In the present invention, the intermediate product is fed by a spiral reamer into a high-speed mixer with a controllably movable baffle.
In the invention, the talcum powder has small bulk specific gravity, so the material is easy to fly and can not be fully contacted with the modifier, thereby influencing the modification effect. The top baffle of the high-speed mixer with the controllable movable baffle can automatically move downwards, the space of the modification bin is compressed, the probability of contact between materials and the modifier is increased, and the modification effect is further improved.
In the present invention, the intermediate product is mixed with the modifier solution during the screw reamer delivery.
In the present invention, the modifier is preferably added in a spray form.
In the present invention, the modifier solution in step (2) contains a modifier and water.
In the invention, the mass volume ratio of the modifier to the water is preferably 1g:1 to 3mL, more preferably 1g:1.2 to 2.8mL, more preferably 1g: 1.5-2.5 mL.
In the present invention, the mass of the modifier is preferably 5 to 10% by mass, more preferably 6 to 9% by mass, and still more preferably 7 to 8% by mass of talc.
In the present invention, the modifier comprises methacrylic acid and methacryloxy silane.
In the present invention, the mass ratio of the methacrylic acid to the methacryloxy silane is preferably 3 to 5:1, more preferably 3.5 to 4.5:1, more preferably 3.8 to 4.2:1.
in the invention, after the talcum powder is subjected to surface modification, the compatibility of the talcum powder in downstream building coating can be improved; after the talcum powder is coated by the methylpropyl acyloxy silane, the adhesion of the product is improved, and when the coating is applied to the downstream, the washing resistance of the coating is improved.
In the present invention, the temperature of the mixing reaction in the step (2) is preferably 100 to 120 ℃, more preferably 105 to 115 ℃, still more preferably 108 to 112 ℃.
In the present invention, the mixing reaction time is preferably 30 to 40 minutes, more preferably 32 to 38 minutes, and still more preferably 34 to 36 minutes.
In the invention, the materials obtained by the mixing reaction are put into a cold mixer for stirring and cooling, then are put into a spiral reamer conveying device, and are conveyed into a finished product bin for sieving, detecting and packaging, thus obtaining the low-grade talcum powder.
In the present invention, the rotation speed of the stirring is preferably 350 to 450r/min, more preferably 380 to 420r/min, and still more preferably 390 to 410r/min; the stirring time is preferably 15 to 20 minutes, more preferably 16 to 19 minutes, and still more preferably 17 to 18 minutes.
The target temperature for cooling in the present invention is preferably 25 to 35 ℃, more preferably 27 to 33 ℃, and even more preferably 29 to 31 ℃.
The invention also provides low-grade talcum powder obtained by the preparation method.
The invention also provides application of the low-grade talcum powder in building paint.
The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
Selecting 100kg of low-grade talcum ore with the silicon dioxide content of 20%, cleaning and naturally airing, crushing by two sections E Shi to obtain talcum particles with the diameter of 10mm, conveying the talcum particles into a ring roller mill for coarse grinding by a belt, grading and collecting the talcum particles, and then feeding the talcum particles into a storage bin to obtain talcum powder with the D50 of 17.02 mu m.
An abrasive solution was prepared by dissolving 150g of sodium polycarboxylate and 150g of polyvinyl alcohol in 1.5L of water.
The talcum powder is put into a spiral reamer, the grinding agent solution is added into the front end of the spiral reamer in a spraying mode, the mixture is conveyed into a high-speed mixer with a controllable movable baffle plate to be mixed for 10min, and the mixture is conveyed into a single-bin ball mill with the ball milling filling rate of 30% to be ball milled for 30min after the mixing is finished. Wherein, the diameter of steel balls with the diameter of 10mm in the ball milling medium: steel ball with diameter of 20 mm: the mass ratio of the steel ball with the diameter of 40mm is 3:3:4, a step of; and after ball milling, grading and collecting the mixture, and feeding the mixture into a bin, wherein the particle size of the detected intermediate product in the bin is 2.05um.
375g methacrylic acid and 125g methacryloyloxy silane were dissolved in 500mL water to prepare a modifier solution.
The intermediate product is conveyed into a special talcum powder modifying machine with a controllable movable baffle plate through a spiral reamer, and the prepared modifier solution is added at the front end of the spiral reamer conveying system in a spray feeding mode. After modification for 30min at 100 ℃, the mixture is put into a cold mixer and stirred at the speed of 400r/min for 15min, the temperature of the material is 35 ℃, and the material is conveyed into a finished product bin by a spiral reamer, and is sieved, detected and packaged.
The specific flow in this embodiment is shown in fig. 1.
Example 2
Selecting 100kg of low-grade talcum ore with the silicon dioxide content of 25%, cleaning and naturally airing, crushing by two sections E Shi to obtain talcum particles with the diameter of 15mm, conveying the talcum particles into a ring roller mill for coarse grinding by a belt, grading and collecting the talcum particles, and then feeding the talcum particles into a storage bin to obtain talcum powder with the diameter of D5016.88um.
300g of sodium polycarboxylate and 200g of polyvinyl alcohol were dissolved in 2.5L of water to prepare an abrasive solution.
100kg of talcum powder is put into a spiral reamer, an abrasive solution is added at the front end of the spiral reamer in a spraying mode, the mixture is conveyed into a high-speed mixer to be mixed for 10min, and the mixture is conveyed into a single-bin ball mill with the ball milling filling rate of 35% to be ball milled for 35min after the mixing is finished. Wherein the mass ratio of the ball milling medium is steel balls with the diameter of 10 mm: steel ball with diameter of 20 mm: steel ball 3 with diameter of 40 mm: 3:4, a step of; after ball milling, grading and collecting the mixture and feeding the mixture into a bin to obtain an intermediate product with the particle size of D501.95um.
A modifier solution was prepared by dissolving 640g methacrylic acid and 160g methacryloyloxy silane in 1.6L water.
The intermediate product is conveyed into a special talcum powder modifying machine with a controllable movable baffle plate through a spiral reamer, and the prepared modifier solution is added at the front end of the spiral reamer conveying system in a spray feeding mode. And (3) modifying at 110 ℃ for 35min, then, stirring at 420r/min for 20min in a cold mixer, wherein the temperature of the material is 32 ℃, conveying the cooled material into a finished product bin through a spiral reamer, sieving, detecting and packaging.
Example 3
Selecting 100kg of low-grade talcum ore with the silicon dioxide content of 28%, cleaning and naturally airing, crushing by two sections E Shi to obtain talcum particles with the diameter of 18mm, conveying the talcum particles into a ring roller mill for coarse grinding by a belt, grading and collecting the talcum particles, and then conveying the talcum particles into a storage bin to obtain talcum powder with the diameter of D5016.90um.
400g of sodium polycarboxylate and 300g of polyvinyl alcohol were dissolved in 3.5L of water to prepare an abrasive solution.
100kg of talcum powder is put into a spiral reamer, the prepared grinding agent solution is added at the front end of the spiral reamer in a spraying mode, the grinding agent solution is conveyed into a high-speed mixer to be mixed for 10min, and the mixed grinding agent solution is conveyed into a single-bin ball mill with the ball milling filling rate of 40% to be ball milled for 40min. Wherein the mass ratio of the ball milling medium is steel balls with the diameter of 10 mm: steel ball with diameter of 20 mm: steel ball 3 with diameter of 40 mm: 3:4, a step of; and after ball milling, grading and collecting the mixture and feeding the mixture into a storage bin to obtain an intermediate product with the particle size of D501.91 um.
A modifier solution was prepared by dissolving 800g methacrylic acid and 200g methacryloyloxy silane in 3L of water.
The intermediate product is conveyed into a special talcum powder modifying machine with a controllable movable baffle plate through a spiral reamer, and the prepared modifier solution is added at the front end of the spiral reamer conveying system in a spray feeding mode. After being modified for 40min at 120 ℃, the mixture enters a cold mixer and is stirred for 20min at the speed of 430r/min, the temperature of the material is 25 ℃, and the material is conveyed into a finished product bin through a spiral reamer, screened, detected and packaged.
The talcum powder prepared in the above examples 1-3 is subjected to relevant index detection according to GB/T15342-2012, and compared with the same type of product produced by the conventional process, and specific parameters are shown in Table 1.
Table 1 results of examples 1 to 3
Example 1 Example 2 Example 3 Air flow mill process
Whiteness degree 91.35 91.52 91.44 91.40
D50(um) 2.05 1.95 1.91 1.97
Oil absorption (ml/100 g) 30 29 27 36
Moisture (%) 0.22 0.22 0.23 0.21
As can be seen from Table 1, the talc powder obtained by the method of the present invention has the same whiteness, fineness, moisture, etc. as those of the ultrafine talc powder produced by the conventional air-jet milling process, but has an oil absorption significantly lower than that of the talc powder produced by the conventional air-jet milling process.
The talcum powder prepared in the above examples 1-3 is applied to an economical building coating formulation, completely replaces kaolin in the formulation and is compared with the original formulation, and the formulation is shown in table 2. And detected according to the correlation standard, the results of which are shown in Table 3.
TABLE 2 economical architectural coating formulations
Figure BDA0004124649180000081
TABLE 3 economic formulation coating test results
Figure BDA0004124649180000082
Figure BDA0004124649180000091
As can be seen from Table 3, the talc powder prepared by the present invention can be used in the formulation of economical building paint to completely replace kaolin. After the emulsion content in the formula is reduced, the performances of covering power, washing resistance, alkali resistance and the like of a paint film still meet the use requirements, and the formula cost is effectively reduced.
As can be seen from the above examples, the present invention provides a low grade talc powder, a preparation method and application thereof, comprising the following steps: mixing talcum powder with an abrasive solution, and ball milling to obtain an intermediate product; and mixing the intermediate product with a modifier solution for reaction to obtain the low-grade talcum powder. As can be seen from table 1, the talc powder obtained by the preparation method of the present invention has lower oil absorption than the talc powder produced by the conventional air-flow grinding process; from table 3, it can be seen that the talcum powder prepared by the invention can be applied to an economic building coating formula to completely replace kaolin, and after the emulsion content in the formula is reduced, the covering power, the washing resistance, the alkali resistance and other performances of a paint film still meet the use requirements, so that the formula cost is effectively reduced.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.

Claims (10)

1. The preparation method of the low-grade talcum powder is characterized by comprising the following steps of:
(1) Mixing talcum powder with an abrasive solution, and ball milling to obtain an intermediate product;
(2) And mixing the intermediate product with a modifier solution for reaction to obtain the low-grade talcum powder.
2. The process according to claim 1, wherein the talc has a D50 of 16 to 18 μm.
3. The method of making according to claim 1 or 2, wherein the abrasive solution comprises an abrasive and water;
the mass volume ratio of the grinding agent to the water is 1g: 5-10 mL.
4. The method of making according to claim 3 wherein the abrasive comprises sodium polycarboxylate and polyvinyl alcohol;
the mass ratio of the sodium polycarboxylate to the polyvinyl alcohol is 1-3: 1, a step of;
the mass of the grinding agent is 3-7 per mill of the mass of talcum powder.
5. The method according to claim 1 or 4, wherein the ball-milling medium comprises a steel ball having a diameter of 5 to 15mm, a steel ball having a diameter of 18 to 25mm, and a steel ball having a diameter of 35 to 45 mm;
the mass ratio of the steel ball with the diameter of 5-15 mm to the steel ball with the diameter of 18-25 mm to the steel ball with the diameter of 35-45 mm is 2-4: 2 to 4:3 to 5;
the medium filling rate of the ball milling is 30-40%;
the ball milling time is 30-45 min.
6. The method of claim 5, wherein the modifier solution in step (2) comprises a modifier and water;
the mass volume ratio of the modifier to the water is 1g: 1-3 mL;
the mass of the modifier is 5-10 per mill of that of talcum powder.
7. The method of preparation of claim 6, wherein the modifier comprises methacrylic acid and methacryloxy silane;
the mass ratio of the methacrylic acid to the methacryloxy silane is 3-5: 1.
8. the method according to claim 7, wherein the temperature of the mixing reaction in the step (2) is 100 to 120 ℃;
the time of the mixing reaction is 30-40 min.
9. Low grade talc obtained by the process of any one of claims 1 to 8.
10. Use of the low grade talc of claim 9 in architectural coatings.
CN202310242052.9A 2023-03-14 2023-03-14 Low-grade talcum powder and preparation method and application thereof Pending CN116218258A (en)

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