CN111333874A - Production process of polyvinyl alcohol ultrafine powder - Google Patents
Production process of polyvinyl alcohol ultrafine powder Download PDFInfo
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- CN111333874A CN111333874A CN202010174049.4A CN202010174049A CN111333874A CN 111333874 A CN111333874 A CN 111333874A CN 202010174049 A CN202010174049 A CN 202010174049A CN 111333874 A CN111333874 A CN 111333874A
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- polyvinyl alcohol
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/12—Powdering or granulating
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2329/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
- C08J2329/02—Homopolymers or copolymers of unsaturated alcohols
- C08J2329/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
Abstract
The invention discloses a production process of polyvinyl alcohol ultrafine powder, which realizes the production of the polyvinyl alcohol ultrafine powder through four steps of raw material selection and cooling treatment, seawater desalination treatment, grading treatment and mixed crushing treatment. The superfine crushing process is suitable for polyvinyl alcohol and other difficult-to-dissolve matters, has wide application range and can improve the salt water resistance of the matters. The superfine powder with uniform particle size distribution is obtained after superfine grinding, the specific surface area of the superfine powder is increased, the adsorbability and the solubility of polyvinyl alcohol are increased, and the reaction contact area is increased, so that the reaction speed is increased, the time is saved in production, and the utilization efficiency is improved. The production process of the invention has the advantages of simple process, excellent product, stable quality, high recovery rate, convenient industrialization and obvious economic benefit.
Description
Technical Field
The invention belongs to the technical field of superfine grinding, and particularly relates to a production process of polyvinyl alcohol superfine powder.
Background
The superfine grinding technology is a high and new technology which is rapidly developed in the last 20 years, and refers to a process of grinding material particles of 0.5-5 mm to micron or even nano-grade particles of 5-25 by using a machine or a fluid power way, the common grinding technology can only lead the particle size of the material to be 45 mu m, and the modern superfine grinding processing technology can be used for grinding the material to superfine powder of 10 mu m or even 1 mu m. The principle is that the material is frozen to below brittle point or vitreous body temperature to make it into brittle state, then the material is ultramicroized by mechanical or airflow pulverization mode. Has the characteristics of fast temperature control, small particle size, utilization rate improvement, pollution reduction, speed improvement and absorption improvement.
Polyvinyl alcohol: organic compounds, white flaky, flocculent or powdery solids, no odor. Is soluble in water (above 95 deg.C), slightly soluble in dimethyl sulfoxide, and insoluble in gasoline, kerosene, vegetable oil, benzene, toluene, dichloroethane, carbon tetrachloride, acetone, ethyl acetate, methanol, and ethylene glycol. Polyvinyl alcohol is an important chemical raw material, and is used for manufacturing polyvinyl acetal, gasoline-resistant pipelines, vinylon synthetic fibers, fabric treating agents, emulsifiers, paper coatings, adhesives, glue and the like. The polyvinyl alcohol is crushed by utilizing an ultrafine crushing technology, so that the insolubility of the polyvinyl alcohol can be reduced to a greater extent, the absorption characteristic of the polyvinyl alcohol is improved, and the utilization rate of the polyvinyl alcohol is improved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a production process of polyvinyl alcohol ultrafine powder.
In order to achieve the purpose, the invention adopts the following technical scheme:
a production process of polyvinyl alcohol ultrafine powder comprises the following steps:
1) raw material selection and cooling treatment: taking polyvinyl alcohol as a first raw material, rapidly cooling at the temperature of-80 to-90 ℃ for 15 to 25min, taking out a cooled substance after cooling is finished, and storing the cooled substance in another container for later use;
2) sea water desalination treatment: adding seawater subjected to seawater desalination treatment into carbonate serving as a second raw material, stirring and reacting for 20-30 min, and then introducing CO into the mixture2Gas, which is used for converting carbonate which is difficult to dissolve into carbonate with higher solubility, removing insoluble impurities by filtering slurry, adding the polyvinyl alcohol obtained in the step 1) into the filtrate, and adding a small amount of alkali solution to fully mix and react completely;
3) grading treatment: purifying the mixture treated in the step 2), then pumping into a grading kettle, grading by using an inner overflow grading kettle with the diameter of phi 1400 and the height of 5000, obtaining products with 3 specifications of 2000 meshes, 1500 meshes and 1200 meshes by using the buoyancy of water, removing the products with 1200 meshes and 1500 meshes through screening treatment, and reserving the products with 2000 meshes;
4) mixing and crushing: and (3) carrying out suction filtration on the mixture after the grading treatment by using a vacuum pump, washing by using deionized water, carrying out suction filtration for the 2 nd time, washing by using absolute ethyl alcohol, carrying out suction filtration for 2-4 times, coarsely crushing the mixture to ensure that the particle size is 2-4 mm, carrying out ultrafine crushing by using an adjustable particle size crusher at a feeding speed of 55-65 kg/h, and screening to obtain the polyvinyl alcohol ultrafine powder.
Further, the carbonate in the step 2) consists of a soluble carbonate and a poorly soluble carbonate, wherein the soluble carbonate is K2CO3、Na2CO3Wherein the sparingly soluble carbonate is CaCO3、MgCO3、Li2CO3One kind of (1).
Further, the alkali solution in the step 2) is one of NaOH and KOH.
Furthermore, the molar ratio of the soluble carbonate to the seawater subjected to seawater desalination treatment is 3-4: 1, and the concentration of the soluble carbonate is 3.2-3.5 mol/L.
Furthermore, the molar ratio of the difficult-to-dissolve carbonate to the seawater subjected to seawater desalination treatment is 2-3: 1, and the concentration of the difficult-to-dissolve carbonate is 2.6-3.0 mol/L.
Compared with the prior art, the invention has the beneficial effects that:
1) the superfine crushing process is suitable for polyvinyl alcohol and other difficult-to-dissolve matters, has wide application range and can improve the salt water resistance of the matters.
2) The superfine powder with uniform particle size distribution is obtained after superfine grinding, the specific surface area of the superfine powder is increased, the adsorbability and the solubility of polyvinyl alcohol are increased, and the reaction contact area is increased, so that the reaction speed is increased, the time is saved in production, and the utilization efficiency is improved.
3) The invention can process different products according to the need, can screen out the particles suitable for the production need, and the products after the grading process have good mixing performance, fast particle dissolution speed, good appearance quality and high yield.
4) The production process of the invention has the advantages of simple process, excellent product, stable quality, high recovery rate, convenient industrialization and obvious economic benefit.
Detailed Description
The following describes in further detail embodiments of the present invention. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1
A production process of polyvinyl alcohol ultrafine powder comprises the following steps:
1) raw material selection and cooling treatment: taking polyvinyl alcohol as a first raw material, rapidly cooling at-80 ℃ for 15min, taking out a cooled substance after cooling is finished, and storing the cooled substance in another container for later use;
2) sea water desalination treatment: adding seawater desalted from carbonate as second raw material, stirring for reaction for 20min, and introducing CO2Gas, which is used for converting carbonate which is difficult to dissolve into carbonate with higher solubility, removing insoluble impurities by filtering slurry, adding the polyvinyl alcohol obtained in the step 1) into the filtrate, and adding a small amount of alkali solution to fully mix and react completely; the carbonate comprises soluble carbonate and insoluble carbonate, wherein the soluble carbonate is K2CO3, the sparingly soluble carbonate being CaCO3The alkali solution is NaOH. The molar ratio of the soluble carbonate to the seawater subjected to seawater desalination treatment is 3:1, and the concentration of the soluble carbonate is 3.2 mol/L. The molar ratio of the refractory carbonate to the seawater subjected to seawater desalination treatment is 2:1, and the concentration of the refractory carbonate is 2.6 mol/L.
3) Grading treatment: purifying the mixture treated in the step 2), then pumping into a grading kettle, grading by using an inner overflow grading kettle with the diameter of phi 1400 and the height of 5000, obtaining products with 3 specifications of 2000 meshes, 1500 meshes and 1200 meshes by using the buoyancy of water, removing the products with 1200 meshes and 1500 meshes through screening treatment, and reserving the products with 2000 meshes;
4) mixing and crushing: and (3) carrying out suction filtration on the mixture after the grading treatment by using a vacuum pump, washing by using deionized water, carrying out suction filtration for the 2 nd time, washing by using absolute ethyl alcohol, carrying out suction filtration for 2-4 times, coarsely crushing the mixture to ensure that the particle size is 2mm, carrying out ultrafine crushing by using an adjustable particle size crusher at a feeding speed of 55kg/h, and screening to obtain the polyvinyl alcohol ultrafine powder.
Example 2
A production process of polyvinyl alcohol ultrafine powder comprises the following steps:
1) raw material selection and cooling treatment: taking polyvinyl alcohol as a first raw material, rapidly cooling at-85 ℃ for 20min, taking out the cooled material after cooling, and storing in another container for later use;
2) sea water desalination treatment: adding seawater desalted from carbonate as second raw material, stirring for reaction for 25min, and introducing CO2Gas, which is used for converting carbonate which is difficult to dissolve into carbonate with higher solubility, removing insoluble impurities by filtering slurry, adding the polyvinyl alcohol obtained in the step 1) into the filtrate, and adding a small amount of alkali solution to fully mix and react completely; the carbonate comprises soluble carbonate and insoluble carbonate, wherein the soluble carbonate is K2CO3、Na2CO3Wherein the sparingly soluble carbonate is CaCO3、MgCO3、Li2CO3The alkali solution is one of NaOH and KOH. The molar ratio of the soluble carbonate to the seawater subjected to seawater desalination treatment is 3.5:1, and the concentration of the soluble carbonate is 3.3 mol/L. The molar ratio of the refractory carbonate to the seawater subjected to seawater desalination treatment is 2.5:1, and the concentration of the refractory carbonate is 2.8 mol/L.
3) Grading treatment: purifying the mixture treated in the step 2), then pumping into a grading kettle, grading by using an inner overflow grading kettle with the diameter of phi 1400 and the height of 5000, obtaining products with 3 specifications of 2000 meshes, 1500 meshes and 1200 meshes by using the buoyancy of water, removing the products with 1200 meshes and 1500 meshes through screening treatment, and reserving the products with 2000 meshes;
4) mixing and crushing: and (3) carrying out suction filtration on the mixture after the grading treatment by using a vacuum pump, washing by using deionized water, carrying out suction filtration for the 2 nd time, washing by using absolute ethyl alcohol, carrying out suction filtration for 3 times, coarsely crushing the mixture to ensure that the particle size is 3mm, carrying out ultrafine crushing by using an adjustable particle size crusher at a feeding speed of 60kg/h, and screening to obtain the polyvinyl alcohol ultrafine powder.
Example 3
A production process of polyvinyl alcohol ultrafine powder comprises the following steps:
1) raw material selection and cooling treatment: taking polyvinyl alcohol as a first raw material, rapidly cooling at-90 ℃ for 25min, taking out a cooled substance after cooling is finished, and storing in another container for later use;
2) sea water desalination treatment: adding seawater desalted from carbonate as second raw material, stirring for reaction for 30min, and introducing CO2Gas, which is used for converting carbonate which is difficult to dissolve into carbonate with higher solubility, removing insoluble impurities by filtering slurry, adding the polyvinyl alcohol obtained in the step 1) into the filtrate, and adding a small amount of alkali solution to fully mix and react completely; the carbonate comprises soluble carbonate and insoluble carbonate, wherein the soluble carbonate is K2CO3、Na2CO3Wherein the sparingly soluble carbonate is CaCO3、MgCO3、Li2CO3The alkali solution is one of NaOH and KOH. The molar ratio of the soluble carbonate to the seawater subjected to seawater desalination treatment is 4:1, and the concentration of the soluble carbonate is 3.5 mol/L. The molar ratio of the refractory carbonate to the seawater subjected to seawater desalination treatment is 3:1, and the concentration of the refractory carbonate is 3.0 mol/L.
3) Grading treatment: purifying the mixture treated in the step 2), then pumping into a grading kettle, grading by using an inner overflow grading kettle with the diameter of phi 1400 and the height of 5000, obtaining products with 3 specifications of 2000 meshes, 1500 meshes and 1200 meshes by using the buoyancy of water, removing the products with 1200 meshes and 1500 meshes through screening treatment, and reserving the products with 2000 meshes;
4) mixing and crushing: and (3) carrying out suction filtration on the mixture after the grading treatment by using a vacuum pump, washing by using deionized water, carrying out suction filtration for the 2 nd time, washing by using absolute ethyl alcohol, carrying out suction filtration for 4 times, coarsely crushing the mixture to ensure that the particle size is 4mm, carrying out ultrafine crushing by using an adjustable particle size crusher at a feeding speed of 65kg/h, and screening to obtain the polyvinyl alcohol ultrafine powder.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (5)
1. A production process of polyvinyl alcohol ultrafine powder is characterized by comprising the following steps:
1) raw material selection and cooling treatment: taking polyvinyl alcohol as a first raw material, rapidly cooling at the temperature of-80 to-90 ℃ for 15 to 25min, taking out a cooled substance after cooling is finished, and storing the cooled substance in another container for later use;
2) sea water desalination treatment: adding seawater subjected to seawater desalination treatment into carbonate serving as a second raw material, stirring and reacting for 20-30 min, and then introducing CO into the mixture2Gas, which is used for converting carbonate which is difficult to dissolve into carbonate with higher solubility, removing insoluble impurities by filtering slurry, adding the polyvinyl alcohol obtained in the step 1) into the filtrate, and adding a small amount of alkali solution to fully mix and react completely;
3) grading treatment: purifying the mixture treated in the step 2), then pumping into a grading kettle, grading by using an inner overflow grading kettle with the diameter of phi 1400 and the height of 5000, obtaining products with 3 specifications of 2000 meshes, 1500 meshes and 1200 meshes by using the buoyancy of water, removing the products with 1200 meshes and 1500 meshes through screening treatment, and reserving the products with 2000 meshes;
4) mixing and crushing: and (3) carrying out suction filtration on the mixture after the grading treatment by using a vacuum pump, washing by using deionized water, carrying out suction filtration for the 2 nd time, washing by using absolute ethyl alcohol, carrying out suction filtration for 2-4 times, coarsely crushing the mixture to ensure that the particle size is 2-4 mm, carrying out ultrafine crushing by using an adjustable particle size crusher at a feeding speed of 55-65 kg/h, and screening to obtain the polyvinyl alcohol ultrafine powder.
2. The process of claim 1, wherein the carbonate in step 2) is selected from the group consisting of soluble carbonate and insoluble carbonate, wherein the soluble carbonate is K2CO3、Na2CO3Wherein the sparingly soluble carbonate is CaCO3、MgCO3、Li2CO3One kind of (1).
3. The process for producing ultra fine polyvinyl alcohol powder as claimed in claim 1, wherein the alkali solution in step 2) is one of NaOH and KOH.
4. The process for producing ultrafine polyvinyl alcohol powder according to claim 1, wherein the molar ratio of the soluble carbonate to the seawater subjected to seawater desalination treatment is 3-4: 1, and the concentration of the soluble carbonate is 3.2-3.5 mol/L.
5. The production process of the polyvinyl alcohol ultrafine powder according to claim 1, wherein the molar ratio of the difficult-to-compatibilize carbonate to the seawater subjected to seawater desalination treatment is 2-3: 1, and the concentration of the difficult-to-compatibilize carbonate is 2.6-3.0 mol/L.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112026052A (en) * | 2020-09-02 | 2020-12-04 | 哈尔滨工业大学 | Preparation method of superfine polyvinyl alcohol particles |
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| CN1821285A (en) * | 2005-02-19 | 2006-08-23 | 德古萨公司 | Polymer powder with block polyetheramide, use in a shaping process, and moldings produced from this polymer powder |
| CN101113218A (en) * | 2007-06-07 | 2008-01-30 | 上海焦耳蜡业有限公司 | Method for producing composite polyethylene wax super fine |
| CN101804378A (en) * | 2010-03-01 | 2010-08-18 | 朱建军 | Polyvinyl alcohol micropowder-type dry powder production process with high product yield |
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2020
- 2020-03-13 CN CN202010174049.4A patent/CN111333874A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1821285A (en) * | 2005-02-19 | 2006-08-23 | 德古萨公司 | Polymer powder with block polyetheramide, use in a shaping process, and moldings produced from this polymer powder |
| CN1740213A (en) * | 2005-07-21 | 2006-03-01 | 上海金树树脂粉末有限公司 | Production process of fine PVA powder for building material |
| CN101113218A (en) * | 2007-06-07 | 2008-01-30 | 上海焦耳蜡业有限公司 | Method for producing composite polyethylene wax super fine |
| CN101804378A (en) * | 2010-03-01 | 2010-08-18 | 朱建军 | Polyvinyl alcohol micropowder-type dry powder production process with high product yield |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112026052A (en) * | 2020-09-02 | 2020-12-04 | 哈尔滨工业大学 | Preparation method of superfine polyvinyl alcohol particles |
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Application publication date: 20200626 |