CN107491110A - PH is stable and has alumina fluid dispersion of soda acid buffering and preparation method thereof - Google Patents
PH is stable and has alumina fluid dispersion of soda acid buffering and preparation method thereof Download PDFInfo
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- CN107491110A CN107491110A CN201710849372.5A CN201710849372A CN107491110A CN 107491110 A CN107491110 A CN 107491110A CN 201710849372 A CN201710849372 A CN 201710849372A CN 107491110 A CN107491110 A CN 107491110A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D21/00—Control of chemical or physico-chemical variables, e.g. pH value
- G05D21/02—Control of chemical or physico-chemical variables, e.g. pH value characterised by the use of electric means
Abstract
A kind of pH is stable and has alumina fluid dispersion of soda acid buffering and preparation method thereof, in terms of 100 parts by weight, 0.1 1 parts of aluminium salt, 1 10 parts of aluminum oxide, remaining is deionized water, and aluminium salt is dissolved in 49 49.9 parts of deionized waters and is configured to aluminum salt solution, and alumina dispersion is configured to alumina fluid dispersion in 40 49 parts of deionized waters, aluminum salt solution and alumina fluid dispersion are mixed and stirred, that is, obtains the stable acidic alumina dispersion liquids of pH.The present invention is by controlling the addition of aluminium salt effectively to control the pH of alumina fluid dispersion, there is time-consuming short, safety non-pollution, cost is low and prepares simple, the alumina fluid dispersion prepared simultaneously has certain buffer effect of fuluic acid, a small amount of acid is added into dispersion liquid or alkali its pH skews are smaller, or when adding reactant in dispersion liquid, if a small amount of hydrogen ion or hydroxide ion are produced in course of reaction, dispersion liquid pH skews are smaller, and within a certain period of time, have and recover to dispersion liquid pH trend itself.
Description
Technical field
The present invention relates to a kind of method for being used to make the pH of acidic alumina dispersion liquid stable, belong to acidic alumina and disperse
Liquid prepares production field.
Background technology
Nano aluminium oxide dispersion liquid with series of advantages such as high homogeneity, high degree of dispersion and high stabilities due to making it
Many industrial circles can be widely used in.Such as the dispersant in cashmere, the protective agent of nylon yarn, carpet cleaner；
Polishing agent as the abrasive material in chemically mechanical polishing and as paper surface, glass fibre and metal surface etc..When pH is higher than 4
When, alumina fluid dispersion easily forms gel, is unfavorable for commercial Application, and the pH of dispersion liquid is to the dispersion stabilization of aluminum oxide
Also have a significant impact, so, in commercial Application, the pH of alumina fluid dispersion is generally remained between 3-4.Therefore, oxygen is controlled
Change aluminium dispersion liquid pH stably as the key technology in aluminum oxide application field.And traditional use inorganic acid (such as nitric acid) regulation oxygen
Change the pH of aluminium dispersion liquid, although its pH temporarily can be adjusted into 3-4, can not make it stable, or even in short half an hour
Within pH will drift about, it is totally unfavorable to production application.And nitric acid has corrosivity, potential safety hazard in operation be present.
Therefore it provides a kind of efficient, safety method that can make acidic alumina dispersion liquid pH holding stabilizations is in alumina dispersion
It is particularly important in the application of liquid.
Currently, the stable methods of alumina fluid dispersion pH can be made by having data to disclose some.Such as United States Patent (USP)
US6364920B1 discloses a kind of method of the stable acidic alumina fluid dispersion pH in the presence of oxidant iodate, this method
It is addition organic acid such as formic acid, acetic acid, maleic acid and citric acid etc. into dispersion liquid, and is heated to reflux 15 minutes.With biography
System is compared with inorganic acid such as nitre acid for adjusting pH, and this method pH drifts are less, and (traditional nitric acid adjusted alumina fluid dispersion after 24 hours
PH skews 0.74, after 24 hours 0.07) best offset value is to this method, but this method needs be heated to seething with excitement and flowing back
Under conditions of can be only achieved optimum efficiency, complex operation, and pH drift values are still larger under optimum condition, are unfavorable for high-volume
Use.United States Patent (USP) US4676928 discloses a kind of side that alumina dispersion lyogel is prevented in the range of pH is 5-9
Method, this method is that the pH of dispersion liquid is adjusted with hydrochloric acid, nitric acid, acetic acid etc., although effectively dispersion liquid can be controlled not form gel,
But the addition of acid with certain corrosivity and needs to heat in environment more than 70 DEG C, potential safety hazard be present；Furthermore pH
Scope is excessive, is not suitable for being applied to fine chemistry industry production field.
Compared with prior art, method stable acidic alumina dispersion liquid pH provided by the invention, there is safety without dirt
Dye, it is time-consuming it is short, prepare simple and low cost and other advantages, paper coating, the agent of textile cool feeling, water paint in acid system
The field such as scratch-resistant and chemically mechanical polishing is widely used.
The content of the invention
For insufficient existing for existing acidic alumina dispersion liquid pH stabilization techniques, a kind of cost of present invention offer is low, peace
Entirely, the stable alumina fluid dispersions of short, pollution-free and with certain buffer effect of fuluic acid pH are taken, while this kind of point is provided
The preparation method of dispersion liquid.
PH prepared by the present invention is stable and has the alumina fluid dispersion of soda acid buffering, in terms of 100 parts by weight, including aluminium salt
0.1-1 parts, aluminum oxide 1-10 parts, remaining is deionized water.
The preparation method of alumina fluid dispersion stable above-mentioned pH is：
In terms of 100 parts by weight, aluminium salt 0.1-1 parts are weighed, aluminum oxide 1-10 parts, remaining is deionized water, and aluminium salt is dissolved
Aluminum salt solution is configured in 49-49.9 part deionized waters, alumina dispersion is configured to aluminum oxide in 40-49 part deionized waters
Dispersion liquid, aluminum salt solution and alumina fluid dispersion are mixed and stirred, that is, obtain the stable acidic alumina dispersion liquids of pH；
The aluminium salt is aluminium chloride or aluminum nitrate.
The mixing time is 15-30 minutes.
The pH is 3-4.
By controlling the addition of aluminium salt to control the pH of alumina fluid dispersion.The acidic alumina prepared to the present invention
A small amount of acid or alkali are added in dispersion liquid, its pH drift is significantly smaller, and mixed liquor returns to acidic oxidation in certain time
Itself pH of aluminium dispersion liquid trend.The acid is nitric acid.The alkali is sodium hydroxide or potassium hydroxide.
The present invention has by controlling the addition of aluminium salt effectively to control the pH of alumina fluid dispersion and takes short, safe nothing
Pollution, cost is low and prepares the advantages that simple, and the alumina fluid dispersion for preparing of the present invention has certain buffer effect of fuluic acid, to dividing
A small amount of acid is added in dispersion liquid or alkali its pH skews are smaller, or when adding reactant in dispersion liquid, if being produced in course of reaction
Raw a small amount of hydrogen ion or hydroxide ion, dispersion liquid pH skews are smaller, and within a certain period of time, have recovery to dispersion liquid sheet
Body pH trend.
Brief description of the drawings
Fig. 1 is the acidic alumina dispersion liquid schematic diagram that pH is changed over time in 24 hours prepared by the present invention.
Fig. 2, which is the acidic alumina dispersion liquid for preparing of the present invention, is adding alkali its pH is deviateed after itself pH 10% in 9 hours
The schematic diagram that pH is changed over time.
Fig. 3 be 5% alumina fluid dispersion adjust its pH with nitric acid after pH is changed over time in 24 hours schematic diagram.
Embodiment
Embodiment 1
What the present embodiment was chosen is 1% aluminum oxide and the system (the aluminum oxide stable pH of preparation of 0.1% aluminum nitrate
Quality of alumina is 1% in dispersion liquid, 0.1%) aluminum nitrate quality is.Detailed process is as follows：
1.pH stability tests
(1) 0.1g aluminum nitrates are weighed to be added in 49.9g deionized waters, is stirred well to and is completely dissolved, be configured to nitric acid
Aluminum solutions；
(2) weigh 1g alumina powders to be added in 49g deionized waters, being sufficiently stirred makes it be uniformly dispersed, and is configured to oxygen
Change aluminium dispersion liquid；
(3) aluminum nitrate solution prepared and alumina fluid dispersion are mixed in equal volume, stirred 30 minutes, make its mixing equal
It is even, it is configured to the stable alumina fluid dispersions of pH；
(4) pH of a solution is surveyed at regular intervals, as a result see the table below：
Table 1. adds aluminum nitrate rear oxidation aluminium dispersion liquid pH and changed with time
| Time (h) | 0.5 | 2.5 | 5.0 | 7.5 | 10.0 | 24.0 |
| pH | 3.85 | 3.85 | 3.85 | 3.85 | 3.85 | 3.85 |
In 24 hours, the pH of alumina fluid dispersion manufactured in the present embodiment is stable constant 3.85.Also reference can be made to by Fig. 1
PH changes over time figure in 24 hours provided.
2.pH cushioning effects are tested
(1) the stable alumina fluid dispersions of 10ml pH manufactured in the present embodiment are taken, add the hydrogen-oxygen that 20 μ l concentration are 0.5M
Change potassium solution, its pH is adjusted to and deviates itself pH 10%, survey the pH of a solution at regular intervals.As a result see the table below：
Dispersion liquid pH changes with time after table 2.1 adds potassium hydroxide
| Time (h) | 0 | 3 | 6 | 9 |
| pH | 4.35 | 4.11 | 4.08 | 4.06 |
Also reference can be made to Fig. 2 is provided plus alkali makes pH deviate after itself pH10%, pH changes over time figure in 9 hours.
(2) the stable alumina fluid dispersions of 10ml pH manufactured in the present embodiment are taken, add the nitric acid that 10 μ l concentration are 0.5M
Solution, its pH is adjusted to and deviates itself pH minus 10% (similarly hereinafter), survey the pH of a solution at regular intervals.As a result see the table below：
Dispersion liquid pH changes with time after table 2.2 adds nitric acid
| Time (h) | 0 | 3 | 6 | 9 |
| pH | 3.48 | 3.60 | 3.89 | 3.86 |
Embodiment 2
What the present embodiment was chosen is 1% aluminum oxide and the system (aluminum oxide point stable pH of preparation of 1% aluminum nitrate
Quality of alumina is 1% in dispersion liquid, 1%) aluminum nitrate quality is.Detailed process is as follows：
1.pH stability tests
(1) 1g aluminum nitrates are weighed to be added in 49g deionized waters, is stirred well to and is completely dissolved, it is molten to be configured to aluminum nitrate
Liquid；
(2) weigh 1g alumina powders to be added in 49g deionized waters, being sufficiently stirred makes it be uniformly dispersed, and is configured to oxygen
Change aluminium dispersion liquid；
(3) aluminum nitrate solution prepared and alumina fluid dispersion are mixed in equal volume, stirred 15 minutes, make its mixing equal
It is even, it is configured to the stable alumina fluid dispersions of pH；
(4) pH of a solution is surveyed at regular intervals.As a result see the table below：
Dispersion liquid pH changes with time after adding aluminum nitrate
In 24 hours, the pH of alumina fluid dispersion manufactured in the present embodiment is stable to be in 3.35-3.36, variable quantity
0.01.Also reference can be made to pH changes over time figure in 24 hours provided by Fig. 1.
2.pH cushioning effects are tested
(1) the stable alumina fluid dispersions of 10ml pH manufactured in the present embodiment are taken, add the hydrogen-oxygen that 20 μ l concentration are 0.5M
Change potassium solution, its pH is adjusted to 3.65, survey the pH of a solution at regular intervals.As a result see the table below：
Dispersion liquid pH changes with time after adding potassium hydroxide
| Time (h) | 0 | 3 | 6 | 9 |
| pH | 3.65 | 3.54 | 3.47 | 3.39 |
Also reference can be made to Fig. 2 is provided plus alkali makes pH deviate after itself pH10%, pH changes over time figure in 9 hours.
(2) the stable alumina fluid dispersions of 10ml pH manufactured in the present embodiment are taken, add the nitric acid that 10 μ l concentration are 0.5M
Solution, its pH is adjusted to 3.00, surveys the pH of a solution at regular intervals.As a result see the table below：
Dispersion liquid pH changes with time after adding nitric acid
| Time (h) | 0 | 3 | 6 | 9 |
| pH | 3.00 | 3.17 | 3.18 | 3.31 |
Embodiment 3
What the present embodiment was chosen is 5% aluminum oxide and the system (the aluminum oxide stable pH of preparation of 0.5% aluminum nitrate
Quality of alumina is 5% in dispersion liquid, 0.5%) aluminum nitrate quality is.Detailed process is as follows：
1.pH stability tests
(1) 0.5g aluminum nitrates are weighed to be added in 49.5g deionized waters, is stirred well to and is completely dissolved, be configured to nitric acid
Aluminum solutions；
(2) weigh 5g alumina powders to be added in 45g deionized waters, being sufficiently stirred makes it be uniformly dispersed, and is configured to oxygen
Change aluminium dispersion liquid；
(3) aluminum nitrate solution prepared and alumina fluid dispersion are mixed in equal volume, stirred 30 minutes, make its mixing equal
It is even, it is configured to the stable alumina fluid dispersions of pH；
(4) pH of a solution is surveyed at regular intervals.As a result see the table below：
Dispersion liquid pH changes with time after adding aluminum nitrate
| Time (h) | 0.5 | 2.5 | 5.0 | 7.5 | 10.0 | 24.0 |
| pH | 3.80 | 3.80 | 3.80 | 3.79 | 3.80 | 3.79 |
In 24 hours, the pH of alumina fluid dispersion manufactured in the present embodiment is stable to be in 3.79-3.80, variable quantity
0.01.Also reference can be made to pH changes over time figure in 24 hours provided by Fig. 1.
2.pH cushioning effects are tested
(1) the stable alumina fluid dispersions of 10ml pH manufactured in the present embodiment are taken, add the hydrogen-oxygen that 20 μ l concentration are 0.5M
Change sodium solution, its pH is adjusted to 4.00, survey the pH of a solution at regular intervals.As a result see the table below：
Dispersion liquid pH changes with time after adding sodium hydroxide
| Time (h) | 0 | 3 | 6 | 9 |
| pH | 4.00 | 3.91 | 3.81 | 3.80 |
Also reference can be made to Fig. 2 is provided plus alkali makes pH deviate after itself pH10%, pH changes over time figure in 9 hours.
(2) the stable alumina fluid dispersions of 10ml pH manufactured in the present embodiment are taken, add the nitric acid that 20 μ l concentration are 0.5M
Solution, its pH is adjusted to 3.54, surveys the pH of a solution at regular intervals.As a result see the table below：
Dispersion liquid pH changes with time after adding nitric acid
| Time (h) | 0 | 3 | 6 | 9 |
| pH | 3.54 | 3.75 | 3.74 | 3.79 |
Embodiment 4
What the present embodiment was chosen is the system (the oxidation stable pH of preparation of 10% aluminum oxide and 0.1% aluminum nitrate
Quality of alumina is 10% in aluminium dispersion liquid, 0.1%) aluminum nitrate quality is.Detailed process is as follows：
1.pH stability tests
(1) 0.1g aluminum nitrates are weighed to be added in 49.9g deionized waters, is stirred well to and is completely dissolved, be configured to nitric acid
Aluminum solutions；
(2) weigh 10g alumina powders to be added in 40g deionized waters, being sufficiently stirred makes it be uniformly dispersed, and is configured to oxygen
Change aluminium dispersion liquid；
(3) aluminum nitrate solution prepared and alumina fluid dispersion are mixed in equal volume, stirred 20 minutes, make its mixing equal
It is even, it is configured to pH stabilizations and the alumina fluid dispersion with cushioning effect；
(4) pH of a solution is surveyed at regular intervals.As a result see the table below：
Dispersion liquid pH changes with time after adding aluminum nitrate
| Time (h) | 0.5 | 2.5 | 5.0 | 7.5 | 10.0 | 24.0 |
| pH | 4.27 | 4.27 | 4.27 | 4.27 | 4.26 | 4.27 |
In 24 hours, the pH of alumina fluid dispersion manufactured in the present embodiment is stable to be in 4.26-4.27, variable quantity
0.01.Also reference can be made to pH changes over time figure in 24 hours provided by Fig. 1.
2.pH cushioning effects are tested
(1) the stable alumina fluid dispersions of 10ml pH manufactured in the present embodiment are taken, add the hydrogen-oxygen that 20 μ l concentration are 0.5M
Change potassium solution, its pH is adjusted to 4.50, survey the pH of a solution at regular intervals.As a result see the table below：
Dispersion liquid pH changes with time after adding potassium hydroxide
| Time (h) | 0 | 3 | 6 | 9 |
| pH | 4.50 | 4.38 | 4.33 | 4.28 |
Also reference can be made to Fig. 2 is provided plus alkali makes pH deviate after itself pH10%, pH changes over time figure in 9 hours.
(2) the stable alumina fluid dispersions of 10ml pH manufactured in the present embodiment are taken, add the nitric acid that 13 μ l concentration are 0.5M
Solution, its pH is adjusted to 3.77, surveys the pH of a solution at regular intervals.As a result see the table below：
Dispersion liquid pH changes with time after adding nitric acid
| Time (h) | 0 | 3 | 6 | 9 |
| pH | 3.77 | 4.11 | 4.11 | 4.20 |
Embodiment 5
What the present embodiment was chosen is 10% aluminum oxide and the system (the aluminum oxide stable pH of preparation of 1% aluminum nitrate
Quality of alumina is 10% in dispersion liquid, 1%) aluminum nitrate quality is.Detailed process is as follows：
1.pH stability tests
(1) 1g aluminum nitrates are weighed to be added in 49g deionized waters, is stirred well to and is completely dissolved, it is molten to be configured to aluminum nitrate
Liquid；
(2) weigh 10g alumina powders to be added in 40g deionized waters, being sufficiently stirred makes it be uniformly dispersed, and is configured to oxygen
Change aluminium dispersion liquid；
(3) aluminum nitrate solution prepared and alumina fluid dispersion are mixed in equal volume, stirred 30 minutes, make its mixing equal
It is even, it is configured to the stable alumina fluid dispersions of pH；
(4) pH of a solution is surveyed at regular intervals.As a result see the table below：
Dispersion liquid pH changes with time after adding aluminum nitrate
| Time (h) | 0.5 | 2.5 | 5.0 | 7.5 | 10.0 | 24.0 |
| pH | 3.65 | 3.65 | 3.66 | 3.66 | 3.65 | 3.65 |
In 24 hours, the pH of alumina fluid dispersion manufactured in the present embodiment is stable in 3.65-3.66, variable quantity 0.01.
Also reference can be made to pH changes over time figure in 24 hours provided by Fig. 1.
2.pH cushioning effects are tested
(1) the stable alumina fluid dispersions of 10ml pH manufactured in the present embodiment are taken, add the hydrogen-oxygen that 20 μ l concentration are 0.5M
Change potassium solution, its pH is adjusted to 3.91, survey the pH of a solution at regular intervals.As a result see the table below：
Dispersion liquid pH changes with time after adding potassium hydroxide
| Time (h) | 0 | 3 | 6 | 9 |
| pH | 3.91 | 3.77 | 3.70 | 3.70 |
Also reference can be made to Fig. 2 is provided plus alkali makes pH deviate after itself pH10%, pH changes over time figure in 9 hours.
(2) the stable alumina fluid dispersions of 10ml pH manufactured in the present embodiment are taken, add the nitric acid that 12 μ l concentration are 0.5M
Solution, its pH is adjusted to 3.11, surveys the pH of a solution at regular intervals.As a result see the table below：
Dispersion liquid pH changes with time after adding nitric acid
| Time (h) | 0 | 3 | 6 | 9 |
| pH | 3.11 | 3.63 | 3.63 | 3.65 |
Embodiment 6
What the present embodiment was chosen is 1% aluminum oxide and the system (the aluminum oxide stable pH of preparation of 0.1% aluminium chloride
Quality of alumina is 1% in dispersion liquid, 0.1%) aluminium chloride quality is.Detailed process is as follows：
1.pH stability tests
(1) weigh 0.1g aluminium chloride aluminium to be added in 49.9g deionized waters, be stirred well to and be completely dissolved, be configured to chlorine
Change aluminum solutions；
(2) weigh 1g alumina powders to be added in 49g deionized waters, being sufficiently stirred makes it be uniformly dispersed, and is configured to oxygen
Change aluminium dispersion liquid；
(3) liquor alumini chloridi prepared and alumina fluid dispersion are mixed in equal volume, stirred 30 minutes, make its mixing equal
It is even, it is configured to the stable alumina fluid dispersions of pH；
(4) pH of a solution is surveyed at regular intervals.As a result see the table below：
Dispersion liquid pH changes with time after adding aluminium chloride
| Time (h) | 0.5 | 2.5 | 5.0 | 7.5 | 10.0 | 24.0 |
| pH | 3.98 | 4.01 | 4.01 | 4.01 | 4.02 | 4.01 |
In 24 hours, the pH of alumina fluid dispersion manufactured in the present embodiment is stable in 3.98-4.03, variable quantity 0.05.
2.pH cushioning effects are tested
(1) the stable alumina fluid dispersions of 10ml pH manufactured in the present embodiment are taken, add the hydrogen-oxygen that 20 μ l concentration are 0.5M
Change sodium solution, its pH is adjusted to 4.71, survey the pH of a solution at regular intervals.As a result see the table below：
Dispersion liquid pH changes with time after adding sodium hydroxide
| Time (h) | 0 | 3 | 6 | 9 |
| pH | 4.71 | 4.62 | 4.30 | 4.20 |
(2) the stable alumina fluid dispersions of 10ml pH manufactured in the present embodiment are taken, add the nitric acid that 20 μ l concentration are 0.5M
Solution, its pH is adjusted to 3.60, surveys the pH of a solution at regular intervals.As a result see the table below：
Dispersion liquid pH changes with time after adding nitric acid
Embodiment 7
What the present embodiment was chosen is 1% aluminum oxide and the system (aluminum oxide point stable pH of preparation of 1% aluminium chloride
Quality of alumina is 1% in dispersion liquid, 1%) aluminium chloride quality is.Detailed process is as follows：
1.pH stability tests
(1) weigh 1g aluminium chloride aluminium to be added in 49g deionized waters, be stirred well to and be completely dissolved, be configured to aluminium chloride
Solution；
(2) weigh 1g alumina powders to be added in 49g deionized waters, being sufficiently stirred makes it be uniformly dispersed, and is configured to oxygen
Change aluminium dispersion liquid；
(3) liquor alumini chloridi prepared and alumina fluid dispersion are mixed in equal volume, stirred 30 minutes, make its mixing equal
It is even, it is configured to the stable alumina fluid dispersions of pH；
(4) pH of a solution is surveyed at regular intervals.As a result see the table below：
Dispersion liquid pH changes with time after adding aluminium chloride
| Time (h) | 0.5 | 2.5 | 5.0 | 7.5 | 10.0 | 24.0 |
| pH | 3.24 | 3.24 | 3.26 | 3.25 | 3.26 | 3.26 |
In 24 hours, the pH of alumina fluid dispersion manufactured in the present embodiment is stable to be in 3.24-3.26, variable quantity
0.02。
2.pH cushioning effects are tested
(1) the stable alumina fluid dispersions of 10ml pH manufactured in the present embodiment are taken, add the hydrogen-oxygen that 20 μ l concentration are 0.5M
Change potassium solution, its pH is adjusted to 3.66, survey the pH of a solution at regular intervals.As a result see the table below：
Dispersion liquid pH changes with time after adding potassium hydroxide
| Time (h) | 0 | 3 | 6 | 9 |
| pH | 3.66 | 3.58 | 3.50 | 3.49 |
(2) the stable alumina fluid dispersions of 10ml pH manufactured in the present embodiment are taken, add the nitric acid that 20 μ l concentration are 0.5M
Solution, its pH is adjusted to 2.90, surveys the pH of a solution at regular intervals.As a result see the table below：
Dispersion liquid pH changes with time after adding nitric acid
| Time (h) | 0 | 3 | 6 | 9 |
| pH | 2.90 | 3.15 | 3.18 | 3.28 |
Embodiment 8
What the present embodiment was chosen is 5% aluminum oxide and the system (the aluminum oxide stable pH of preparation of 0.5% aluminium chloride
Quality of alumina is 5% in dispersion liquid, 0.5%) aluminium chloride quality is.Detailed process is as follows：
1.pH stability tests
(1) weigh 0.5g aluminium chloride aluminium to be added in 49.5g deionized waters, be stirred well to and be completely dissolved, be configured to chlorine
Change aluminum solutions；
(2) weigh 5g alumina powders to be added in 45g deionized waters, being sufficiently stirred makes it be uniformly dispersed, and is configured to oxygen
Change aluminium dispersion liquid；
(3) liquor alumini chloridi prepared and alumina fluid dispersion are mixed in equal volume, stirred 30 minutes, make its mixing equal
It is even, it is configured to the stable alumina fluid dispersions of pH；
(4) pH of a solution is surveyed at regular intervals.As a result see the table below：
Dispersion liquid pH changes with time after adding aluminium chloride
| Time (h) | 0.5 | 2.5 | 5.0 | 7.5 | 10.0 | 24.0 |
| pH | 3.73 | 3.73 | 3.72 | 3.73 | 3.73 | 3.73 |
In 24 hours, the pH of alumina fluid dispersion manufactured in the present embodiment is stable to be in 3.72-3.73, variable quantity
0.01。
2.pH cushioning effects are tested
(1) the stable alumina fluid dispersions of 10ml pH manufactured in the present embodiment are taken, add the hydrogen-oxygen that 20 μ l concentration are 0.5M
Change potassium solution, its pH is adjusted to 4.17, survey the pH of a solution at regular intervals.As a result see the table below：
Dispersion liquid pH changes with time after adding potassium hydroxide
| Time (h) | 0 | 3 | 6 | 9 |
| pH | 4.17 | 3.90 | 3.79 | 3.77 |
(2) the stable alumina fluid dispersions of 10ml pH manufactured in the present embodiment are taken, add the nitric acid that 20 μ l concentration are 0.5M
Solution, its pH is adjusted to 3.42, surveys the pH of a solution at regular intervals.As a result see the table below：
Dispersion liquid pH changes with time after adding nitric acid
| Time (h) | 0 | 3 | 6 | 9 |
| pH | 3.42 | 3.55 | 3.55 | 3.55 |
Embodiment 9
What the present embodiment was chosen is the system (the oxidation stable pH of preparation of 10% aluminum oxide and 0.1% aluminium chloride
Quality of alumina is 10% in aluminium dispersion liquid, 0.1%) aluminium chloride quality is.Detailed process is as follows：
1.pH stability tests
(1) weigh 0.1g aluminium chloride aluminium to be added in 49.9g deionized waters, be stirred well to and be completely dissolved, be configured to chlorine
Change aluminum solutions；
(2) weigh 10g alumina powders to be added in 40g deionized waters, being sufficiently stirred makes it be uniformly dispersed, and is configured to oxygen
Change aluminium dispersion liquid；
(3) liquor alumini chloridi prepared and alumina fluid dispersion are mixed in equal volume, stirred 30 minutes, make its mixing equal
It is even, it is configured to the stable alumina fluid dispersions of pH；
(4) pH of a solution is surveyed at regular intervals.As a result see the table below：
Dispersion liquid pH changes with time after adding aluminium chloride
| Time (h) | 0.5 | 2.5 | 5.0 | 6.0 | 8.0 | 10.0 | 24.0 |
| pH | 4.26 | 4.24 | 4.26 | 4.26 | 4.27 | 4.26 | 4.26 |
In 24 hours, the pH of alumina fluid dispersion manufactured in the present embodiment is stable to be in 4.24-4.27, variable quantity
0.03.2.pH cushioning effects are tested
(1) the stable alumina fluid dispersions of 10ml pH manufactured in the present embodiment are taken, add the hydrogen-oxygen that 20 μ l concentration are 0.5M
Change sodium solution, its pH is adjusted to 4.77, survey the pH of a solution at regular intervals.As a result see the table below：
Dispersion liquid pH changes with time after adding sodium hydroxide
| Time (h) | 0 | 3 | 6 | 9 |
| pH | 4.77 | 4.62 | 4.53 | 4.36 |
(2) the stable alumina fluid dispersions of 10ml pH manufactured in the present embodiment are taken, add the nitric acid that 20 μ l concentration are 0.5M
Solution, its pH is adjusted to 3.68, surveys the pH of a solution at regular intervals.As a result see the table below：
Dispersion liquid pH changes with time after adding nitric acid
| Time (h) | 0 | 3 | 6 | 9 |
| pH | 3.68 | 4.24 | 4.24 | 4.24 |
Embodiment 10
What the present embodiment was chosen is 10% aluminum oxide and the system (the aluminum oxide stable pH of preparation of 1% aluminium chloride
Quality of alumina is 10% in dispersion liquid, 1%) aluminium chloride quality is.Detailed process is as follows：
1.pH stability tests
(1) weigh 1g aluminium chloride aluminium to be added in 49g deionized waters, be stirred well to and be completely dissolved, be configured to aluminium chloride
Solution；
(2) weigh 10g alumina powders to be added in 40g deionized waters, being sufficiently stirred makes it be uniformly dispersed, and is configured to oxygen
Change aluminium dispersion liquid；
(3) liquor alumini chloridi prepared and alumina fluid dispersion are mixed in equal volume, stirred 30 minutes, make its mixing equal
It is even, it is configured to the stable alumina fluid dispersions of pH；
(4) pH of a solution is surveyed at regular intervals.As a result see the table below：
Dispersion liquid pH changes with time after adding aluminium chloride
| Time (h) | 0.5 | 2.5 | 5.0 | 7.5 | 10.0 | 24.0 |
| pH | 3.50 | 3.50 | 3.51 | 3.53 | 3.53 | 3.53 |
In 24 hours, the pH of alumina fluid dispersion manufactured in the present embodiment is stable in 3.50-3.53, variable quantity 0.03.
2.pH cushioning effects are tested
(1) the stable alumina fluid dispersions of 10ml pH manufactured in the present embodiment are taken, add the hydrogen-oxygen that 20 μ l concentration are 0.5M
Change potassium solution, its pH is adjusted to 4.02, survey the pH of a solution at regular intervals.As a result see the table below：
Dispersion liquid pH changes with time after adding potassium hydroxide
| Time (h) | 0 | 3 | 6 | 9 |
| pH | 4.02 | 3.83 | 3.80 | 3.75 |
(2) the stable alumina fluid dispersions of 10ml pH manufactured in the present embodiment are taken, add the nitric acid that 20 μ l concentration are 0.5M
Solution, its pH is adjusted to 3.20, surveys the pH of a solution at regular intervals.As a result see the table below：
Dispersion liquid pH changes with time after adding nitric acid
| Time (h) | 0 | 3 | 6 | 9 |
| pH | 3.20 | 3.30 | 3.34 | 3.40 |
Comparative example
What this comparative example was chosen is 5% alumina fluid dispersion, and detailed process is as follows：
1.pH stability tests
(1) weigh 0.5g aluminum oxide to be added in 9.5g deionized waters, being sufficiently stirred makes it be uniformly dispersed, and is configured to aoxidize
Aluminium dispersion liquid；
(2) salpeter solution that 40 μ l concentration are 1M is added in the alumina fluid dispersion in (1)；
(3) pH of a solution is surveyed at regular intervals.As a result see the table below：
Dispersion liquid pH changes with time after adding nitric acid
As can be seen that changed greatly without the pH of dispersion liquid after the alumina fluid dispersion addition nitric acid for adding aluminium salt.The change
Change and also can be found in after 5% alumina fluid dispersions that provide of Fig. 3 adjust its pH with nitric acid that pH changes over time figure in 24 hours.
2.pH cushioning effects are tested
(1) alumina fluid dispersion for taking this comparative example of 10ml to prepare, the potassium hydroxide solution that 20 μ l concentration are 0.5M is added,
Its pH is changed into 7.88.
(2) alumina fluid dispersion for taking this comparative example of 10ml to prepare, the salpeter solution that 20 μ l concentration are 0.5M, its pH are added
It is changed into 2.68.
As can be seen that compared with embodiment 3 and embodiment 8, same concentrations, the alumina fluid dispersion without addition aluminium salt exist
The acid or alkali of equivalent, the alumina fluid dispersion that pH changes are all prepared much larger than the present invention are added under the conditions of same initial pH.
Claims (5)
1. a kind of pH is stable and with the alumina fluid dispersion of soda acid buffering, it is characterized in that：In terms of 100 parts by weight, including aluminium salt
0.1-1 parts, aluminum oxide 1-10 parts, remaining is deionized water.
2. pH described in a kind of claim 1 is stable and has the preparation method of the alumina fluid dispersion of soda acid buffering, it is characterized in that：
In terms of 100 parts by weight, aluminium salt 0.1-1 parts, aluminum oxide 1-10 parts, remaining is deionized water, and aluminium salt is dissolved in into 49-49.9 parts
Aluminum salt solution is configured in ionized water, alumina dispersion is configured to alumina fluid dispersion in 40-49 part deionized waters, by aluminium salt
Solution and alumina fluid dispersion, which mix, to stir, that is, obtains the stable acidic alumina dispersion liquids of pH.
3. pH according to claim 1 is stable and has the preparation method of the alumina fluid dispersion of soda acid buffering, its feature
It is：The aluminium salt is aluminium chloride or aluminum nitrate.
4. pH according to claim 2 is stable and has the preparation method of the alumina fluid dispersion of soda acid buffering, its feature
It is：The mixing time is 15-30 minutes.
5. pH according to claim 2 is stable and has the preparation method of the alumina fluid dispersion of soda acid buffering, its feature
It is：The pH is 3-4.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200801166A (en) * | 2006-03-23 | 2008-01-01 | Cabot Microelectronics Corp | Iodate-containing chemical-mechanical polishing compositions and methods |
| CN101967661A (en) * | 2010-10-26 | 2011-02-09 | 广东多正化工科技有限公司 | Trivalent chromium plating solution |
| CN102861565A (en) * | 2012-09-14 | 2013-01-09 | 上海电力学院 | Aluminum oxide-loaded cerium oxide catalyst and preparation method and application thereof |
| CN106861766A (en) * | 2017-02-28 | 2017-06-20 | 山西大学 | A kind of alumina support and preparation method and application |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200801166A (en) * | 2006-03-23 | 2008-01-01 | Cabot Microelectronics Corp | Iodate-containing chemical-mechanical polishing compositions and methods |
| CN101967661A (en) * | 2010-10-26 | 2011-02-09 | 广东多正化工科技有限公司 | Trivalent chromium plating solution |
| CN102861565A (en) * | 2012-09-14 | 2013-01-09 | 上海电力学院 | Aluminum oxide-loaded cerium oxide catalyst and preparation method and application thereof |
| CN106861766A (en) * | 2017-02-28 | 2017-06-20 | 山西大学 | A kind of alumina support and preparation method and application |
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