CN110407212B - High-dispersity nano carbonate gel as well as preparation method and application thereof - Google Patents
High-dispersity nano carbonate gel as well as preparation method and application thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/60—Preparation of carbonates or bicarbonates in general
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- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D15/00—Lithium compounds
- C01D15/08—Carbonates; Bicarbonates
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- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D7/00—Carbonates of sodium, potassium or alkali metals in general
- C01D7/02—Preparation by double decomposition
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/18—Carbonates
- C01F11/182—Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by an additive other than CaCO3-seeds
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/24—Magnesium carbonates
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/26—Carbonates
- C04B14/28—Carbonates of calcium
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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
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
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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
- 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
- C09C1/02—Compounds of alkaline earth metals or magnesium
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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
- 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
- C09C1/02—Compounds of alkaline earth metals or magnesium
- C09C1/021—Calcium carbonates
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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
- 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
- C09C1/02—Compounds of alkaline earth metals or magnesium
- C09C1/028—Compounds containing only magnesium as metal
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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
- 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
Abstract
The invention discloses a high-dispersity nano carbonate gel and a preparation method and application thereof, wherein the nano carbonate gel comprises polyalcohol, polybasic acid, metal salt, carbonate and a nano crystal grain growth inhibitor; the molar ratio of the polyhydric alcohol to the polybasic acid to the metal salt to the carbonate to the nano crystal grain growth inhibitor is 6-10: 2-3: 10-20: 12-18: 1-1.5. Firstly, nano carbonate crystals are generated by solution polymerization in a certain pH value environment, and then a nano crystal growth inhibitor is added to enable the nano carbonate crystals in the solution and the water dispersion to form nano carbonate gel. The nano-particle crystal grains in the prepared nano-carbonate gel are uniform and fine, the particle size distribution range is narrow, and the mechanical property and the dispersion effect are good. The invention has simple preparation process, convenient operation, low energy consumption and low cost, and has good application prospect in the fields of building materials, rubber, plastics, coatings, papermaking and the like.
Description
Technical Field
The invention relates to the technical field of nano materials, in particular to a high-dispersity nano carbonate gel and a preparation method and application thereof.
Background
The nano carbonate has small particle size, large specific surface area and high surface activity, has the special small-size effect and surface effect of nano particles, shows excellent physical and chemical properties which common carbonate does not have, and is widely applied to various industrial fields such as plastics, rubber, paint, printing ink, papermaking, coating and the like as a high-grade functional inorganic filler. The nanometer carbonate is prepared through chemical combination reaction of calcium hydroxide and carbon dioxide in a carbonizer, and under the action of certain temperature and crystal form controlling agent, superfine nanometer calcium carbonate particles are produced.
In order to solve the above problems, a large amount of research has been conducted by domestic and foreign scholars. For example, the invention patent 201310270211.2 discloses a method for preparing low surface energy monodisperse nano calcium carbonate, which comprises the steps of dispersing nano calcium carbonate powder materials in an aqueous solution to a nano level and keeping stability by using a dispersing agent and a stabilizing agent in a compounding manner, stirring at a high speed and shearing, dispersing by ultrasonic waves and other methods, wherein the dispersing agent consists of an anionic surfactant, a nonionic surfactant and a cationic surfactant, and can disperse the nano calcium carbonate powder in the aqueous solution to the nano level, namely, the particle size is less than 100 nm; the stabilizing effect of the stabilizer is obvious, and the stabilizer and the dispersant have a promoting effect on the dispersing effect after being compounded and used; the invention patent CN201410106412.3 discloses a method for preparing suspension dispersion type nano calcium carbonate, which introduces hydrophilic polymer to semi-wrap or fully wrap calcium carbonate, thereby effectively improving the dispersibility and the suspensibility of nano calcium carbonate particles in water or organic solvent, and further improving the wide applicability of the nano calcium carbonate particles in industry; CN201910246918.7 discloses a method for preparing nano calcium carbonate stably suspended and dispersed in an aqueous solution, which comprises the steps of preparing nano calcium carbonate by using a carbonization method, introducing carbon dioxide gas into a calcium hydroxide suspension to obtain nano calcium carbonate slurry, carbonizing for 5-10 min to obtain nano calcium carbonate cooked slurry, adding a hydrophilic agent, stirring and modifying for 1-24 h at the temperature of room temperature to 120 ℃, and obtaining the nano calcium carbonate stably suspended and dispersed in the aqueous solution after centrifuging, filter pressing, drying and crushing. The method uses surfactant or polymer to coat the nano calcium carbonate, utilizes the steric hindrance effect formed by carbon chains on the surface of the nano calcium carbonate to isolate particles from each other, reduces specific surface energy, enables the nano calcium carbonate to be in a monodisperse state and stably suspend in aqueous solution, solves the problem of nano powder agglomeration on the surface and reduces the indicated molecular energy, but practical application and research show that the method still has great defects. The additive amount and the physical properties of the nano calcium carbonate in products are influenced for a long time. The reason is as follows: 1. in the carbonization process of the nano calcium carbonate, a part of particles form pseudo-agglomeration, and the particles of the pseudo-agglomeration are coated by the agglomerates when a surfactant is added for activation treatment; 2. the surface activation treatment of the nano calcium carbonate is carried out under the condition of slurry, and because the existing mixed coating treatment equipment cannot be uniformly mixed, the treatment agent and the nano particles are not uniformly coated, so that the modification treatment effect is influenced; 3. the specific surface area of the nano calcium carbonate is large, the addition amount of the surfactant is 3-5% of the mass ratio of the calcium carbonate at present, the surface coating layer is thin, the modification effect is limited to a certain extent, and if the addition amount of the surfactant is increased, the physical performance of the nano powder in a product is reduced on one hand, and the production cost is also increased on the other hand; in addition, the reaction temperature is high, the reaction time is long, the energy consumption is increased, the treatment such as centrifugation or filter pressing, drying, crushing and the like is required in the preparation process, and the preparation method is complex, so the practical application of the preparation method is limited.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problems to be solved by the invention are as follows: the invention provides a high-dispersity nano carbonate gel, which solves the problems of easy agglomeration, poor dispersity and reduced physical property of the existing modified nano material.
The invention also provides a preparation method of the high-dispersity nano carbonate gel, and solves the problems of complex preparation process, high production energy consumption, high production cost and the like of the existing nano material.
The invention also provides the application of the high-dispersity nano carbonate gel as a filler in the aspects of concrete, rubber, plastics, paint or papermaking, and the high-dispersity nano carbonate gel can replace nano carbonate, reduce the cost and expand the application range of the nano carbonate gel.
In order to solve the technical problems, the invention adopts the following technical scheme: a highly dispersible nanocarbonate gel comprising a polyol, a polyacid, a metal salt, a carbonate, and a nanocrystalline grain growth inhibitor; the molar ratio of the polyhydric alcohol to the polybasic acid to the metal salt to the carbonate to the nano crystal grain growth inhibitor is 6-10: 2-3: 10-20: 12-18: 1-1.5.
Further, the solid content of the high-dispersity nano carbonate gel is 45-50%, and the particle size of nanoparticles in the nano carbonate gel is 50-100 nm.
Further, the polyalcohol is one or a mixture of ethanol, Ethylene Glycol (EG), 1, 2-propylene glycol (1, 2-PG), neopentyl glycol (NPG), Trimethylolpropane (TMP) and glycerol according to any proportion.
Further, the carbonate is sodium carbonate, potassium carbonate, calcium carbonate or magnesium carbonate.
Further, the polybasic acid is fatty acid, stearic acid, phosphoric acid or carboxylic acid polybasic acid, and the carboxylic acid polybasic acid is preferably one or a mixture of more of periodic acid, stearic acid, palmitic acid, oleic acid, caprylic acid, capric acid and linolenic acid according to any proportion.
Further, the metal salt is metal chlorate, metal bromate or metal fluoate, and the metal is preferably calcium, potassium, sodium or magnesium.
Further, the nano grain growth inhibitor is TiC, TaC, NbC, Cr3C2Or Mo2C。
The invention also provides a preparation method of the high-dispersity nano carbonate gel, which comprises the following steps:
1) slowly adding polyalcohol into polybasic acid, dropwise adding and stirring until the polyalcohol is completely dissolved until the pH value of the mixed solution reaches 4.6-5.0;
2) adding metal salt into the mixed solution obtained in the step 1), stirring uniformly, then adding carbonate, mixing uniformly, carrying out polymerization reaction, after the reaction is finished, heating to 60-70 ℃, then adding a nano crystal grain growth inhibitor, reacting for 6-8 h, and cooling to room temperature to obtain the high-dispersity nano carbonate gel.
Further, the reaction temperature in the polymerization reaction is 30-50 ℃, and the reaction time is 2-3 h.
The invention also provides the application of the high-dispersity nano carbonate gel as a filler in the aspects of concrete, rubber, plastics, paint or papermaking.
Compared with the prior art, the invention has the following beneficial effects:
1. in the preparation of the nano carbonate gel, firstly, nano carbonate crystals are generated by solution polymerization in a certain pH value environment, and then a nano crystal growth inhibitor is added to enable the nano carbonate crystals in the solution and the water dispersion to form nano carbonate hydrogel. The nano carbonate particles in the nano carbonate hydrogel are directionally arranged into a flaky distribution in the generation process, and the flaky nano particles are mutually contacted in a surface-to-surface mode, so that a three-dimensional network structure with a nano structure is formed. The flaky three-dimensional network structure can be combined with a plurality of water molecules through hydrogen bonds, so that the nano-particle has excellent dispersibility in aqueous solution, and meanwhile, the stable three-dimensional network structure also improves the mechanical property of the nano-particle. Thereby solving the problems of easy agglomeration and poor dispersibility of the traditional nano calcium carbonate powder.
2. The modified nano carbonate gel is prepared by taking conventional reagents such as polyol, polybasic acid, metal salt, carbonate and the like as raw materials, adding a nano grain growth inhibitor after primary solution polymerization reaction at 60-70 ℃. The method does not need processes such as centrifugal filtration, high-temperature drying and mechanical grinding, has the advantages of simple process, convenient operation, low reaction temperature, short reaction time, energy conservation, abundant raw materials, low price and low production cost, and is suitable for industrial production. And the corresponding nano carbonate gel can be prepared by changing the type of the added metal salt, and the practicability is strong.
3. The nano crystal growth inhibitor is added, so that nano particles in the gel are uniform and fine in grain size, narrow in grain size distribution range, less in impurity content, good in mechanical property and dispersion effect, and free of additional surfactant or other hydrophilic treatment agents in the using process, and the influence on the physical property of the gel is avoided. Compared with the common commercially available nano calcium carbonate particles, the nano carbonate gel prepared by the invention has better performance as a filler, can meet the application requirements in the fields of building materials, rubber, plastics, coatings, papermaking, paints, printing ink, daily chemical industry and the like, can completely replace nano particles, greatly reduces the cost, simplifies the steps, and has good economic benefit and application prospect.
Detailed Description
The present invention will be described in further detail with reference to examples.
Preparation method of high-dispersity nano carbonate gel
Example 1
The high-dispersity nano calcium carbonate gel is prepared by the following method:
1) 150ml of industrial ethanol was poured into a 1000ml four-necked flask, and 50ml of stearic acid was slowly dropped into the flask while stirring to completely dissolve the stearic acid in the industrial ethanol until the pH of the aqueous suspension reached 4.6, to obtain a mixed solution.
2) Adding 300ml of 2.5mol/L calcium chloride solution into the mixed solution prepared in the step 1), stirring uniformly, adding 300ml of 2.5mol/L sodium carbonate solution, heating to 40 ℃, reacting for 2-3 h, heating to 65 ℃, adding 20ml of 1mol/L TiC solution into a four-neck flask, reacting for 6-8 h, and slowly cooling to room temperature for 1-2 h after the reaction is completed to obtain the modified nano calcium carbonate gel with the solid content of 47.5% and the nano particle size of 65.4 nm.
Example 2
The high-dispersity nano magnesium carbonate gel is prepared by the following method:
1) 150ml of Trimethylolpropane (TMP) was poured into a 1000ml four-necked flask, and 80ml of palmitic acid was slowly dropped into the flask while stirring to completely dissolve the palmitic acid in the Trimethylolpropane (TMP), and the addition of the palmitic acid was stopped until the pH of the aqueous suspension reached 4.7, to obtain a mixed solution.
2) Adding 350ml of 2.5mol/L magnesium chloride solution into the mixed solution obtained in the step 1), stirring uniformly, adding 320ml of 2.5mol/L sodium carbonate solution, heating to 40 ℃, reacting for 2-3 h, heating to 65 ℃, adding 25ml of 1mol/L TaC solution into a four-neck flask, reacting for 6-8 h, and slowly cooling for 1-2 h to room temperature after the reaction is completed to obtain the modified nano magnesium carbonate gel with the solid content of 48.2% and the nano particle size of 74.8 nm.
Example 3
The high-dispersity nano lithium carbonate gel is prepared by the following method:
1) a mixed solution of Ethylene Glycol (EG) and neopentyl glycol (NPG) in a total amount of 150ml is poured into a 1000ml four-necked flask, wherein the molar ratio of ethylene glycol to neopentyl glycol is 1:1, 60ml of linolenic acid is slowly added dropwise into the flask while stirring to completely dissolve the linolenic acid in the mixed alcohol, and the addition of the linolenic acid is stopped until the pH value of the aqueous suspension reaches 5.0, thereby obtaining a mixed solution.
2) Adding 320ml of 2.5mol/L lithium chloride solution into the mixed solution obtained in the step 1), stirring uniformly, adding 350ml of 2.5mol/L sodium carbonate solution, heating to 40 ℃, reacting for 2-3 h, heating to 65 ℃, and adding 30ml of 1mol/L Cr into a four-neck flask3C2And (3) reacting the solution for 6-8 hours, and slowly cooling the solution for 1-2 hours to room temperature after the reaction is completed to obtain the modified nano lithium carbonate gel with the solid content of 46.8% and the nano particle size of 54.7 nm.
Example 4
A high-dispersity nanometer potassium carbonate gel is prepared by the following method:
1) 150ml of mixed alcohol of 1, 2-propanediol (1, 2-PG) and glycerol was taken out from a 500ml measuring cylinder and poured into a 1000ml four-necked flask, wherein the molar ratio of 1, 2-propanediol (1, 2-PG) to glycerol was 1:2, 90ml of mixed acid of periodic acid and decanoic acid (the molar ratio of periodic acid to decanoic acid was 2: 3) was slowly added dropwise thereto, and the mixed acid of periodic acid and decanoic acid was completely dissolved in the mixed alcohol of 1, 2-propanediol (1, 2-PG) and glycerol while stirring was added dropwise until the pH of the aqueous suspension reached 4.8, thereby obtaining a mixed solution.
2) Adding 320ml of 2.5mol/L potassium chloride solution into the mixed solution obtained in the step 1), stirring uniformly, adding 320ml of 2.5mol/L sodium carbonate solution, heating to 40 ℃, reacting for 2-3 h, heating to 65 ℃, and adding 30ml of 1mol/L Mo into a four-neck flask2And C, reacting the solution C for 6-8 hours, and slowly cooling the solution C to room temperature for 1-2 hours after the reaction is completed to obtain the modified nano potassium carbonate gel with the solid content of 49.4% and the nano particle size of 86.5 nm.
Application of di-nano carbonate gel
The nano carbonate gel prepared in examples 1 to 4 and the common nano calcium carbonate particles purchased from the market were used as fillers for preparing autoclaved aerated concrete, and then the prepared autoclaved aerated concrete was subjected to performance comparison tests, and the results are shown in table 1.
The preparation method of the autoclaved aerated concrete comprises the following steps:
s1: accurately weighing 35g of quartz sand, 12g of fly ash, 18 g of tailing slag, 2g of gypsum, 15g of quick lime, 8 g of cement and 10g of red mud, adding 20g of water, and stirring at the speed of 150-200 rpm for 3-5 min to obtain slurry;
s2: adding nano carbonate gel or common commercially available nano calcium carbonate particles (the addition ratio is shown in table 1) in a corresponding ratio, 0.10 g of aluminum powder, 5g of naphthalene water reducer, 0.2g of PVA fiber and 34g of water into the slurry obtained in the step S1, and stirring at the speed of 300-400 rpm for 5-8 min to obtain mixed slurry;
s3: assembling a mould, coating a release agent on the inner wall of the mould, drying, pouring the mixed slurry obtained in the step S2 into the mould, covering a plastic film on the surface, standing for foaming, and then curing at room temperature for 5 hours to thicken the mixed slurry to obtain the production strength;
s4: after the static maintenance is finished, demolding the test piece, and cutting the test piece according to the required specification and size to obtain a blank body; and performing standard curing on the blank for 4d to obtain the autoclaved aerated concrete.
TABLE 1 comparison of properties of autoclaved aerated concrete with different nanomaterial additives
From the above table results it can be analyzed that: the nano calcium carbonate and the nano carbonate gel can be filled in the gaps of the concrete, so that the porosity of the set cement is reduced, the structure of the aerated concrete is uniform and compact, the compressive strength of the aerated concrete product can be improved to different degrees, and the water absorption rate and the drying shrinkage of the aerated concrete product are reduced. Wherein, the effect of the nano carbonate gel prepared by the invention when the doping amount of the nano carbonate gel in concrete is 2 percent is equivalent to the effect of the nano carbonate gel prepared by the invention when the doping amount of the common commercial nano calcium carbonate particles in concrete is 3 percent; when the mixing amount of the nano carbonate gel is the same as that of the common commercially available nano calcium carbonate in concrete (3%), the nano carbonate gel has better performance, because the gel is in a paste or paste shape and has good hydrophilicity, the nano carbonate gel can be directly mixed into aerated concrete slurry and is extremely easy to disperse uniformly. Therefore, various types of nano carbonate gel prepared by the method can achieve the expected beneficial effects, have strong practicability and stable product performance, and can completely replace nano calcium carbonate to be used as a filler. The nano carbonate gel prepared by the invention can also be used as a filler for concrete, rubber, plastics, paint or papermaking, and the mechanical property of the product is improved.
The above description is only exemplary of the present invention and should not be taken as limiting, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A highly dispersible nanocarbonate gel comprising a polyol, a polyacid, a metal salt, a carbonate, and a nanocrystalline grain growth inhibitor; the molar ratio of the polyhydric alcohol to the polybasic acid to the metal salt to the carbonate to the nano crystal grain growth inhibitor is 6-10: 2-3: 10-20: 12-18: 1-1.5;
the polyalcohol is one or a mixture of more of ethylene glycol, 1, 2-propylene glycol, neopentyl glycol, trimethylolpropane and glycerol in any proportion;
the nano grain growth inhibitor is TiC, TaC, NbC, Cr3C2Or Mo2C；
The preparation method of the high-dispersity nano carbonate gel comprises the following steps:
1) slowly adding polyhydric alcohol into polybasic acid, stirring while dropwise adding to completely dissolve the polyhydric alcohol, and stopping adding the polybasic acid until the pH value of the solution reaches 4.6-5.0 to obtain a mixed solution;
2) adding metal salt into the mixed solution obtained in the step 1), uniformly stirring, then adding carbonate, uniformly mixing, carrying out polymerization reaction, after the reaction is finished, heating to 60-70 ℃, then adding a nano crystal grain growth inhibitor, reacting for 6-8 h, and cooling to room temperature to obtain the high-dispersity nano carbonate gel;
the carbonate is sodium carbonate, potassium carbonate, calcium carbonate or magnesium carbonate;
the metal salt is metal chlorate, metal bromate or metal fluoate, and the metal is calcium, potassium, sodium or magnesium.
2. The high-dispersibility nano carbonate gel according to claim 1, wherein the solid content of the high-dispersibility nano carbonate gel is 45-50%, and the particle size of the nanoparticles in the nano carbonate gel is 50-100 nm.
3. The highly dispersible nanocarbonate gel according to claim 1, wherein said polyacid is periodic acid, phosphoric acid, fatty acids, or carboxylic polyacid.
4. The method for preparing the highly dispersible nanometer carbonate gel according to claim 1, wherein the reaction temperature in the polymerization reaction is 30-50 ℃ and the reaction time is 2-3 h.
5. Use of the highly dispersible nanocarbonate gel according to any one of claims 1 to 4 as a filler in concrete, rubber, plastics, coatings, paper, paints or inks.
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