CN116855102A - Submicron spherical alumina powder and preparation method thereof - Google Patents
Submicron spherical alumina powder and preparation method thereof Download PDFInfo
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- CN116855102A CN116855102A CN202310835696.9A CN202310835696A CN116855102A CN 116855102 A CN116855102 A CN 116855102A CN 202310835696 A CN202310835696 A CN 202310835696A CN 116855102 A CN116855102 A CN 116855102A
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 239000000843 powder Substances 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims abstract description 6
- 239000011259 mixed solution Substances 0.000 claims abstract description 28
- 239000000203 mixture Substances 0.000 claims abstract description 24
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000013049 sediment Substances 0.000 claims abstract description 18
- 238000003756 stirring Methods 0.000 claims abstract description 18
- 239000000126 substance Substances 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 10
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000002791 soaking Methods 0.000 claims abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 239000002245 particle Substances 0.000 claims abstract description 6
- 239000006228 supernatant Substances 0.000 claims abstract description 6
- 238000005406 washing Methods 0.000 claims abstract description 6
- 238000001035 drying Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 11
- 239000000047 product Substances 0.000 claims description 7
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 6
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 5
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 5
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 2
- 239000005416 organic matter Substances 0.000 claims 1
- 239000000945 filler Substances 0.000 abstract description 3
- 239000007822 coupling agent Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000004033 plastic Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 239000005060 rubber Substances 0.000 description 4
- 150000001298 alcohols Chemical class 0.000 description 3
- 239000002052 molecular layer Substances 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910008051 Si-OH Inorganic materials 0.000 description 1
- 229910006358 Si—OH Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229920006336 epoxy molding compound Polymers 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 125000000962 organic group Chemical group 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 238000006557 surface reaction Methods 0.000 description 1
Classifications
-
- 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
- C09C1/40—Compounds of aluminium
- C09C1/407—Aluminium oxides or hydroxides
-
- 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
- C09C3/006—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
- C09C3/06—Treatment with inorganic compounds
- C09C3/063—Coating
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention discloses submicron spherical alumina powder and a preparation method thereof, and is characterized by comprising the following steps: step 1: adding pure water and alcohol organic matters into a reaction kettle, stirring to prepare a mixed solution A, and heating the mixed solution to 75-80 ℃; step 2: adding aluminum oxide powder into the mixed solution A, stirring for 3-5min, continuously adding 0.1-2% of silane coupling agent into the mixed solution A, and stirring for 1-5h to obtain a mixture B, wherein the mass ratio of aluminum oxide to the mixed solution A is 1:1, and the median particle size is 0.1-10 mu m; step 3: standing and settling the mixture B for 5-72h, and removing supernatant to obtain sediment C; step 4: adding 98% concentrated sulfuric acid into the sediment C, and soaking for 72-120 hours to obtain a mixture D, wherein the mass of the concentrated sulfuric acid is the same as that of the sediment C; step 5: taking out the mixture D, washing the mixture D with pure water until SO 4 2‑ The content is less than or equal to 0.01ppm, and the substance alumina E is obtained; step 6: drying alumina E at 120-150 deg.c to obtain productF, mainly applied to modified filler.
Description
Technical Field
The invention belongs to the technical field of inorganic powder, and particularly relates to a preparation method of alumina powder.
Background
Alumina is widely used as a modified filler for organic materials such as rubber, plastic, fiber, resin and the like because of a series of characteristics such as high strength, high hardness, good thermal stability, high temperature resistance, wear resistance and the like, and brings excellent stability, reinforcement and optical performance to the materials.
However, aluminum oxide is difficult to form firm chemical bonding with plastics and rubber due to fewer surface hydroxyl groups, and the mechanical properties of the materials are easily reduced due to direct or excessive filling.
Aiming at the poor mechanical property of the material with alumina as a filler, the conventional coupling agent is used for modifying the surface of alumina at present.
CN112480477a provides a surface modification method of spherical alumina for high-strength epoxy molding compounds, which is easy for mass production and can slow down deactivation of phosphorus-containing curing accelerators. However, the method is only applicable to phosphorus-containing curing accelerator material systems, and is not applicable to other types of curing accelerator material systems, such as platinum catalysts.
CN111471327a forms a composite coupling agent from aluminate coupling agent, titanate coupling agent and silane coupling agent, and modifies the surface of alumina powder by the composite coupling agent to obtain modified alumina powder with excellent hydrophobic property, but the method adopts dry modification, is easy to generate agglomeration in the modification process, and is not suitable for industrial production.
Disclosure of Invention
In order to solve the technical problems in the background technology, the invention provides alumina powder and a preparation method thereof, and adopts the following technical scheme:
a method for preparing alumina powder, comprising the steps of:
step 1: adding pure water and alcohol organic matters into a reaction kettle, stirring to prepare a mixed solution A, and heating the mixed solution to 75-80 ℃;
step 2: adding aluminum oxide powder into the mixed solution A, stirring for 3-5min, continuously adding 0.1-2% of silane coupling agent into the mixed solution A, and stirring for 1-5h to obtain a mixture B, wherein the mass ratio of aluminum oxide to the mixed solution A is 1:1, and the median particle size is 0.1-10 mu m;
step 3: standing and settling the mixture B for 5-72h, and removing supernatant to obtain sediment C;
step 4: adding 98% concentrated sulfuric acid into the sediment C, and soaking for 72-120 hours to obtain a mixture D, wherein the mass of the concentrated sulfuric acid is the same as that of the sediment C;
step 5: taking out the mixture D, washing the mixture D with pure water until SO 4 2- The content is less than or equal to 0.01ppm, and the substance alumina E is obtained;
step 6: and drying the alumina E at 120-150 ℃ to obtain a product F.
The product F has the following indexes:
median particle size: 0.1-10 μm, SSA (specific surface area): 0.1-15m 2 /g，Al 2 O 3 ≥99.5％，SiO 2 Thickness: 2-5nm, and the moisture content is less than or equal to 0.01 percent.
Flexural strength was carried out according to GB/T6569-2006 standard. The modulus of elasticity test was performed according to GB/T10700-2006 standard. SiO (SiO) 2 Thickness TEM testing.
Compared with the prior art, the invention has the following advantages:
1. the ethanol is stirred at a specific temperature to gradually decrease, and the hydrolysis reaction of the silane coupling agent and the surface reaction of the hydrolyzed silane coupling agent and alumina are simultaneously and slowly carried out along with the decrease of the ethanol, so that the self-polycondensation of the silane coupling agent is effectively prevented.
2. The 98% concentrated sulfuric acid soaking process dehydrates the organic groups on the surface of the alumina to form nano SiO 2 A molecular layer. And SiO 2 More Si-OH is formed with water molecules more easily, and more chemical bonds are formed with plastics and rubber.
3、SiO 2 The molecular layer can improve the acid corrosion resistance of the alumina.
4. By coating SiO on the surface of alumina 2 The molecular layer increases more chemical bonding with plastics and rubber, improves bending strength and elastic modulus, and improves acid corrosion resistance.
The specific embodiment is as follows:
example 1
A method for preparing submicron spherical alumina powder, comprising the steps of:
step 1: adding pure water and alcohol organic matters into a reaction kettle, stirring to prepare a mixed solution A, and heating to 75 ℃. Wherein pure water: the mass ratio of the alcohol organic matters is 1:1, and the alcohols are used: methanol.
Step 2: adding the alumina powder into the mixed solution A, stirring for 3-5min, and continuously adding 1.5% of silane coupling agent into the mixed solution A, and stirring for 1h to obtain a mixture B. Wherein the mass ratio of the alumina to the mixed solution A is 1:1.
Step 3: the mixture B was allowed to stand still for 72 hours, and the supernatant was removed to obtain sediment C.
Step 4: adding 98% concentrated sulfuric acid into the sediment C for soaking for 120 hours to obtain a mixture D. Wherein the mass of the concentrated sulfuric acid is the same as the mass of the sediment C.
Step 5: taking out the substance D, washing the substance D with pure water until the substance D is SO 4 2- The content is less than or equal to 0.01ppm, and the substance alumina E is obtained.
Step 6: alumina E was dried at 120℃for 48h to give product F.
Example 2
A method for preparing submicron spherical alumina powder, comprising the steps of:
step 1: adding pure water and alcohol organic matters into a reaction kettle, stirring to prepare a mixed solution A, and heating to 75 ℃. Wherein pure water: the mass ratio of the alcohol organic matters is 1:1, and the alcohols are used:ethanol。
Step 2: adding the alumina powder into the mixed solution A, stirring for 3-5min, and continuously adding 1.0% of silane coupling agent into the mixed solution, stirring for 1h to obtain a mixture B, wherein the mass ratio of the alumina to the mixed solution is 1:1.
Step 3: the mixture B was allowed to stand still for 24 hours, and the supernatant was removed to obtain sediment C.
Step 4: adding 98% concentrated sulfuric acid into the sediment C for soaking for 90 hours to obtain a mixture D. Wherein the concentrated sulfuric acid has the same mass as sediment C.
Step 5: taking out the substance D, washing the substance D with pure water until the substance D is SO 4 2- The content is less than or equal to 0.01ppm, and the substance alumina E is obtained.
Step 6: alumina E was dried at 130℃for 36h to give product F.
Example 3
A method for preparing submicron spherical alumina powder, comprising the steps of:
step 1: adding pure water and alcohol organic matters into a reaction kettle, stirring to prepare a mixed solution A, and heating to 80 ℃. Wherein pure water: the mass ratio of the alcohol organic matters is 1:1, and the alcohols are used: isopropyl alcohol.
Step 2: adding the alumina powder into the mixed solution A, stirring for 3-5min, and continuously adding the silane coupling agent with the concentration of 0.2% into the mixed solution, stirring for 1h to obtain a mixture B, wherein the mass ratio of the alumina to the mixed solution is 1:1.
Step 3: the mixture B was allowed to stand still for 5 hours, and the supernatant was removed to obtain sediment C.
Step 4: adding 98% concentrated sulfuric acid into the sediment C for soaking for 72 hours to obtain a mixture D. Wherein the concentrated sulfuric acid has the same mass as sediment C.
Step 5: taking out the substance D, washing the substance D with pure water until the substance D is SO 4 2- The content is less than or equal to 0.01ppm, and the substance alumina E is obtained.
Step 6: alumina E was dried at 150℃for 24h to give product F.
The detailed parameters of the specific examples and comparative examples are shown in Table 1
TABLE 1
Specific detection data are shown in Table 2
TABLE 2
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (5)
1. A method for preparing submicron spherical alumina powder, which is characterized by comprising the following steps:
step 1: adding pure water and alcohol organic matters into a reaction kettle, stirring to prepare a mixed solution A, and heating the mixed solution to 75-80 ℃;
step 2: adding aluminum oxide powder into the mixed solution A, stirring for 3-5min, continuously adding 0.1-2% of silane coupling agent into the mixed solution A, and stirring for 1-5h to obtain a mixture B, wherein the mass ratio of aluminum oxide to the mixed solution A is 1:1, and the median particle size is 0.1-10 mu m;
step 3: standing and settling the mixture B for 5-72h, and removing supernatant to obtain sediment C;
step 4: adding 98% concentrated sulfuric acid into the sediment C, and soaking for 72-120 hours to obtain a mixture D, wherein the mass of the concentrated sulfuric acid is the same as that of the sediment C;
step 5: taking out the mixture D, washing the mixture D with pure water until SO 4 2- The content is less than or equal to 0.01ppm, and the substance alumina E is obtained;
step 6: and drying the alumina E at 120-150 ℃ to obtain a product F.
2. The method for preparing submicron spherical alumina powder according to claim 1, wherein the mass ratio of pure water to alcohol organic matters in the step 1 is 1:1.
3. The method for preparing submicron spherical alumina powder according to claim 1, characterized in that the alcohol organic matter is: one or more of methanol, ethanol and isopropanol.
4. The preparation method of submicron spherical alumina powder according to claim 1, wherein the mass ratio of alumina to the mixed solution A in the step 2 is 1:1, and the median particle diameter is 0.1-10 μm.
5. A submicron spherical alumina powder characterized by the median particle diameter of product F: 0.1-10 μm, SSA:0.1-15m 2 /g，Al 2 O 3 ≥99.5％，SiO 2 Thickness: 2-5nm, and the moisture content is less than or equal to 0.01 percent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310835696.9A CN116855102A (en) | 2023-07-10 | 2023-07-10 | Submicron spherical alumina powder and preparation method thereof |
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| CN116855102A true CN116855102A (en) | 2023-10-10 |
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| CN202310835696.9A Pending CN116855102A (en) | 2023-07-10 | 2023-07-10 | Submicron spherical alumina powder and preparation method thereof |
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2023
- 2023-07-10 CN CN202310835696.9A patent/CN116855102A/en active Pending
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