CN116769192A - Acid-resistant hydrophobic PVP gel and preparation method and application thereof - Google Patents
Acid-resistant hydrophobic PVP gel and preparation method and application thereof Download PDFInfo
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- CN116769192A CN116769192A CN202310167715.5A CN202310167715A CN116769192A CN 116769192 A CN116769192 A CN 116769192A CN 202310167715 A CN202310167715 A CN 202310167715A CN 116769192 A CN116769192 A CN 116769192A
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- 239000002253 acid Substances 0.000 title claims abstract description 51
- 230000002209 hydrophobic effect Effects 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 238000001879 gelation Methods 0.000 title description 2
- RMTXUPIIESNLPW-UHFFFAOYSA-N 1,2-dihydroxy-3-(pentadeca-8,11-dienyl)benzene Natural products CCCC=CCC=CCCCCCCCC1=CC=CC(O)=C1O RMTXUPIIESNLPW-UHFFFAOYSA-N 0.000 claims abstract description 70
- QARRXYBJLBIVAK-UEMSJJPVSA-N 3-[(8e,11e)-pentadeca-8,11-dienyl]benzene-1,2-diol;3-[(8e,11e)-pentadeca-8,11,14-trienyl]benzene-1,2-diol;3-[(8e,11e,13e)-pentadeca-8,11,13-trienyl]benzene-1,2-diol;3-[(e)-pentadec-8-enyl]benzene-1,2-diol;3-pentadecylbenzene-1,2-diol Chemical compound CCCCCCCCCCCCCCCC1=CC=CC(O)=C1O.CCCCCC\C=C\CCCCCCCC1=CC=CC(O)=C1O.CCC\C=C\C\C=C\CCCCCCCC1=CC=CC(O)=C1O.C\C=C\C=C\C\C=C\CCCCCCCC1=CC=CC(O)=C1O.OC1=CC=CC(CCCCCCC\C=C\C\C=C\CC=C)=C1O QARRXYBJLBIVAK-UEMSJJPVSA-N 0.000 claims abstract description 70
- IYROWZYPEIMDDN-UHFFFAOYSA-N 3-n-pentadec-8,11,13-trienyl catechol Natural products CC=CC=CCC=CCCCCCCCC1=CC=CC(O)=C1O IYROWZYPEIMDDN-UHFFFAOYSA-N 0.000 claims abstract description 70
- DQTMTQZSOJMZSF-UHFFFAOYSA-N urushiol Natural products CCCCCCCCCCCCCCCC1=CC=CC(O)=C1O DQTMTQZSOJMZSF-UHFFFAOYSA-N 0.000 claims abstract description 70
- 239000000499 gel Substances 0.000 claims abstract description 68
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 49
- 238000003756 stirring Methods 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000009210 therapy by ultrasound Methods 0.000 claims abstract description 16
- 239000000017 hydrogel Substances 0.000 claims abstract description 15
- 238000001035 drying Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 6
- 239000004922 lacquer Substances 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 238000002390 rotary evaporation Methods 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 4
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 97
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 97
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 97
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 27
- 238000010438 heat treatment Methods 0.000 description 20
- 239000011521 glass Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 2
- 238000001157 Fourier transform infrared spectrum Methods 0.000 description 1
- 235000019463 artificial additive Nutrition 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000005445 natural material Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
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- Processes Of Treating Macromolecular Substances (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses an acid-resistant hydrophobic PVP gel, a preparation method and application thereof, wherein the preparation method of the acid-resistant hydrophobic PVP gel comprises the following steps: PVP and absolute ethyl alcohol are mixed and stirred for at least 6 hours, and then stirred for 3 to 6 hours at the temperature of 30 to 40 ℃ to obtain a first-stage product; adding urushiol into the first-stage product until the mass ratio of the added urushiol to PVP is 1:1, stopping adding urushiol, adding absolute ethyl alcohol under the stirring condition, stirring for 6-8 h, preserving heat for 3-6 h at 50-60 ℃, and performing ultrasonic treatment for 10-15 min to obtain a second-stage product; adding urushiol into the second-stage product at 50-60 ℃ until the mass ratio of the added urushiol to PVP is 1: stopping adding urushiol, adding absolute ethyl alcohol under stirring, stirring for 6-8 h, preserving heat for 3-6 h at 70-80 ℃, and performing ultrasonic treatment for 10-15 min to obtain PVP/urushiol hydrogel solution; and drying the PVP/urushiol hydrogel solution to obtain the acid-resistant hydrophobic PVP gel. The acid-resistant hydrophobic PVP gel disclosed by the invention overcomes the defects of large water solubility and poor acid resistance of PVP.
Description
Technical Field
The invention belongs to the technical field of high molecular hydrogel materials, and particularly relates to an acid-resistant hydrophobic PVP gel, and a preparation method and application thereof.
Background
Polyvinylpyrrolidone (PVP) is a nonionic water-soluble high molecular compound and is commonly used for thickening, moisture absorption, condensation and the like, and has wide application prospect due to excellent biocompatibility and physiological inertia, and is commonly used for binders, film forming agents and the like. However, the poor acid resistance and extremely high water solubility limit the application of PVP and become the main pain point of PVP application.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a preparation method of acid-resistant hydrophobic PVP gel, which utilizes urushiol to modify PVP to prepare the acid-resistant hydrophobic PVP gel with acid resistance and low water solubility, solves the pain points with high water solubility and poor acid resistance of PVP and widens the application of the acid-resistant hydrophobic PVP gel.
Another object of the present invention is to provide an acid-resistant hydrophobic PVP gel obtained by the above preparation method.
Another object of the invention is to provide the use of the acid-resistant hydrophobic PVP gel in reducing water solubility or improving acid resistance in a membrane material.
The aim of the invention is achieved by the following technical scheme.
The preparation method of the acid-resistant hydrophobic PVP gel comprises the following steps:
1) PVP and absolute ethyl alcohol are mixed and stirred for at least 6 hours, and then stirred for 3 to 6 hours at the temperature of 30 to 40 ℃ to obtain a first-stage product;
in the step 1), the PVP accounts for 10-15 wt% of the absolute ethyl alcohol in the step 1) in parts by weight.
In step 1), the at least 6h is 6 to 8h.
In step 1), the temperature is raised to 30-40 ℃ at a rate of 10-12 ℃/h.
2) Adding urushiol into the first-stage product at 30-40 ℃ until the mass ratio of the urushiol added in the step 2) to PVP in the step 1) is 1:1, stopping adding urushiol, adding absolute ethyl alcohol under stirring, stirring for 6-8 h, preserving heat for 3-6 h at 50-60 ℃, and performing ultrasonic treatment for 10-15 min to obtain a second-stage product;
in the technical scheme, the absolute ethyl alcohol added in the step 2) is 10-12% of the absolute ethyl alcohol in the step 1) according to the volume parts.
In step 2), urushiol is added to the first stage product at a rate of 0.1 to 0.15g/h.
In step 2), the temperature is raised to 50-60 ℃ at a rate of 10-12 ℃/h.
3) Adding urushiol into the second-stage product at 50-60 ℃ until the mass ratio of the mass of the urushiol added in the step 3) to the mass of PVP in the step 1) is 1: stopping adding urushiol, adding absolute ethyl alcohol under stirring, stirring for 6-8 h, preserving heat for 3-6 h at 70-80 ℃, and performing ultrasonic treatment for 10-15 min to obtain PVP/urushiol hydrogel solution;
in the technical scheme, the absolute ethyl alcohol added in the step 3) is 5% of the absolute ethyl alcohol added in the step 1) according to the volume parts.
In step 3), urushiol is added to the second stage product at a rate of 0.1 to 0.15g/h.
In step 3), the temperature is raised to 70-80 ℃ at a rate of 10-12 ℃/h.
4) And drying the PVP/urushiol hydrogel solution to obtain the acid-resistant hydrophobic PVP gel.
In the technical scheme, the method for obtaining urushiol comprises the following steps: mixing raw lacquer and absolute ethyl alcohol according to the mass ratio of 1 (3-4), carrying out ultrasonic treatment for 1-1.5 h, filtering impurities, and carrying out rotary evaporation at 180-190 ℃ until the absolute ethyl alcohol is completely evaporated to obtain urushiol.
In the step 4), the drying temperature is 60-80 ℃, and the drying time is 4-6 h.
The acid-resistant hydrophobic PVP gel obtained by the preparation method.
The acid-resistant hydrophobic PVP gel is used for reducing water solubility or improving acid resistance.
Compared with the prior art, the invention has the following advantages:
(1) PVP has the characteristics of good biocompatibility, physiological inertia and the like, and is often applied to binders, film forming agents and the like. But the wide application is limited due to the defects of large water solubility and poor acid resistance; the rigid benzene ring structure and the flexible long chain segment of urushiol enable the coating film to have excellent physical and chemical properties. The two are mixed, so that the defects of high water solubility and poor acid resistance of PVP can be overcome, and degradation and corrosion of PVP in the using process can be prevented.
(2) The invention makes PVP and urushiol fully combined by three sections of heating, stirring and ultrasonic, so as to realize modification of PVP.
(3) Based on the application of the traditional PVP, the natural material of urushiol can make PVP have high acid resistance, and the PVP is improved by a non-synthetic additive.
Drawings
FIG. 1 is a photograph in which, (a) is the acid-resistant hydrophobic PVP gel prepared in example 1, (b) is the PVP gel prepared in example 2, and (c) is the acid-resistant hydrophobic PVP gel prepared in example 3;
FIG. 2 is a Fourier transform infrared spectrum of the acid-resistant hydrophobic PVP gel prepared in example 1, the PVP gel prepared in example 2, and the PVP gel prepared in comparative example 1;
FIG. 3 shows the water contact angle of (a) the acid-resistant hydrophobic PVP gel prepared in example 1, (b) the PVP gel prepared in example 2, and (c) the PVP gel prepared in comparative example 1;
fig. 4 is a photograph, wherein (a 1) is a photograph of the acid-resistant hydrophobic PVP gel prepared in example 1 upon dropping acetic acid, (a 2) is a photograph of the acid-resistant hydrophobic PVP gel prepared in example 1 upon dropping acetic acid and standing for 1h, (b 1) is a photograph of the PVP gel prepared in example 2 upon dropping acetic acid, and (b 2) is a photograph of the acid-resistant hydrophobic PVP gel prepared in example 2 upon dropping acetic acid and standing for 1 h.
Detailed Description
The technical scheme of the invention is further described below with reference to specific embodiments.
The sources of purchase for the raw materials in the examples below were as follows: absolute ethanol (99.5% or more), available from national pharmaceutical group chemical reagent company, inc; polyvinylpyrrolidone (m=58000), available from Shanghai milin Biochemical technologies Co., ltd; raw lacquer was purchased from eastern chang raw lacquer limited in Fuzhou.
The method for obtaining urushiol in the following examples comprises the following steps: mixing raw lacquer and absolute ethyl alcohol according to a mass ratio of 1:3 in a beaker, carrying out ultrasonic treatment for 1h, filtering impurities, and carrying out rotary evaporation at 180 ℃ until the absolute ethyl alcohol is completely evaporated, so as to obtain urushiol as a residual residue.
The rotational speed of stirring in the examples described below was 700rpm.
Example 1
The preparation method of the acid-resistant hydrophobic PVP gel comprises the following steps:
1) Mixing PVP (polyvinylpyrrolidone) and absolute ethyl alcohol, magnetically stirring for 6 hours, heating to 40 ℃ at a speed of 10 ℃/h (water-proof heating), and stirring for 3 hours at 40 ℃ to obtain a first-stage product, wherein PVP is 10% of the absolute ethyl alcohol in the step 1) in parts by mass;
2) Adding urushiol into the first-stage product at the temperature of 40 ℃ at a rate of 0.1g/h (the temperature is kept unchanged during the step of adding urushiol), stopping adding urushiol until the mass ratio of the added urushiol in the step 2) to PVP in the step 1) is 1:1, adding absolute ethyl alcohol under stirring, stirring for 6h (the temperature is unchanged during the process), heating to 60 ℃ at the speed of 10 ℃/h (water-proof heating), and preserving the heat at the temperature of 60 ℃ for 3h, and performing ultrasonic treatment for 10min (the temperature is unchanged during the process), so as to obtain a second-stage product, wherein the absolute ethyl alcohol in the step 2) is 10% of the absolute ethyl alcohol in the step 1) in terms of volume parts;
3) Adding urushiol into the second-stage product at 60 ℃ at a rate of 0.1g/h (the temperature is kept unchanged during the step of adding urushiol), stopping adding urushiol until the mass ratio of the added urushiol in the step 3) to PVP in the step 1) is 1:1, adding absolute ethyl alcohol under stirring (the temperature is unchanged during the process), stirring for 6h, heating to 80 ℃ at a rate of 10 ℃/h, and preserving heat at 80 ℃ (heating in a water-proof manner) for 3h, and performing ultrasonic treatment for 10min (the temperature is unchanged during the process), so as to obtain PVP/urushiol hydrogel solution, wherein the absolute ethyl alcohol added in the step 3) is 5% of the absolute ethyl alcohol in the step 1) in terms of volume part;
4) Coating PVP/urushiol hydrogel solution on a glass plate, forming a gel layer with the thickness of about 2mm on the glass plate, putting the gel layer into an oven, and drying at 60 ℃ for 4 hours to obtain the acid-resistant hydrophobic PVP gel.
Example 2 (comparative)
A method of preparing a PVP gel comprising the steps of:
1) Mixing PVP (polyvinylpyrrolidone) and absolute ethyl alcohol, magnetically stirring for 6 hours, heating to 40 ℃ at a speed of 10 ℃/h (water-proof heating), and stirring for 3 hours at 40 ℃ to obtain a first-stage product, wherein PVP is 10% of the absolute ethyl alcohol in the step 1) in parts by mass;
2) Adding urushiol into the first-stage product at the temperature of 40 ℃ at a rate of 0.1g/h (the temperature is kept unchanged during the step of adding urushiol), stopping adding urushiol until the mass ratio of the added urushiol in the step 2) to PVP in the step 1) is 1:1, adding absolute ethyl alcohol under stirring, stirring for 6h (the temperature is unchanged during the process), heating to 60 ℃ at the speed of 10 ℃/h (water-proof heating), and preserving the heat at the temperature of 60 ℃ for 3h, and performing ultrasonic treatment for 10min (the temperature is unchanged during the process), so as to obtain a second-stage product, wherein the absolute ethyl alcohol in the step 2) is 10% of the absolute ethyl alcohol in the step 1) in terms of volume parts;
3) Stirring the product of the second stage at 60 ℃ for 6 hours, heating to 80 ℃ at the speed of 10 ℃/h, and preserving heat for 3 hours at 80 ℃ (water-proof heating), and carrying out ultrasonic treatment for 10 minutes (the temperature is unchanged in the process) to obtain a hydrogel solution;
4) The hydrogel solution is smeared on a glass plate, a gel layer with the thickness of about 2mm is formed on the glass plate, and the gel layer is put into an oven and dried for 6 hours at the temperature of 60 ℃ to obtain PVP gel.
Example 3
The preparation method of the acid-resistant hydrophobic PVP gel comprises the following steps:
1) Mixing PVP (polyvinylpyrrolidone) and absolute ethyl alcohol, magnetically stirring for 6 hours, heating to 30 ℃ at a speed of 10 ℃/h (water-proof heating), and stirring for 3 hours at 30 ℃ to obtain a first-stage product, wherein PVP is 10% of the absolute ethyl alcohol in the step 1) in parts by mass;
2) Adding urushiol into the first-stage product at 30 ℃ at a rate of 0.1g/h (the temperature is kept unchanged during the step of adding urushiol), stopping adding urushiol until the mass ratio of the added urushiol in the step 2) to PVP in the step 1) is 1:1, adding absolute ethyl alcohol under stirring, stirring for 6h (the temperature is unchanged during the process), heating to 50 ℃ at a rate of 10 ℃/h (water-proof heating), and preserving heat at 50 ℃ for 3h, and performing ultrasonic treatment for 10min (the temperature is unchanged during the process), so as to obtain a second-stage product, wherein the absolute ethyl alcohol in the step 2) is 10% of the absolute ethyl alcohol in the step 1) in terms of volume parts;
3) Adding urushiol into the second-stage product at 50 ℃ at a rate of 0.1g/h (the temperature is kept unchanged during the step of adding urushiol), stopping adding urushiol until the mass ratio of the added urushiol in the step 3) to PVP in the step 1) is 1:1, adding absolute ethyl alcohol under stirring (the temperature is unchanged during the process), stirring for 6h, heating to 70 ℃ at a rate of 10 ℃/h, and preserving heat at 70 ℃ (heating in water insulation) for 3h, and performing ultrasonic treatment for 10min (the temperature is unchanged during the process), so as to obtain PVP/urushiol hydrogel solution, wherein the absolute ethyl alcohol added in the step 3) is 5% of the absolute ethyl alcohol in the step 1) in terms of volume part;
4) Coating PVP/urushiol hydrogel solution on a glass plate, forming a gel layer with the thickness of about 2mm on the glass plate, putting the gel layer into an oven, and drying at 60 ℃ for 4 hours to obtain the acid-resistant hydrophobic PVP gel.
Comparative example 1
A method of preparing a PVP gel comprising the steps of:
PVP (polyvinylpyrrolidone) and absolute ethyl alcohol are mixed, magnetically stirred for 6 hours, then heated to 40 ℃ at the speed of 10 ℃/h (water-proof heating), stirred for 3 hours at 40 ℃, then subjected to ultrasonic treatment for 10 minutes (the temperature is unchanged in the process), a hydrogel solution is obtained, the hydrogel solution is smeared on a glass plate, a gel layer with the thickness of about 2mm is formed on the glass plate, the glass plate is put into an oven, and dried for 4 hours at 60 ℃ to obtain PVP gel, wherein PVP is 10% of absolute ethyl alcohol in parts by weight.
As can be seen from fig. 1, the acid-resistant hydrophobic PVP gel prepared in example 1 in (a) has uniform gel texture and uniform color distribution, and the urushiol and PVP are fully fused, so that the gel crosslinking effect is good. (b) The PVP gel prepared in the example 2 has uneven gel texture and uneven color distribution, and the urushiol and PVP are proved to be insufficiently fused, so that the gel crosslinking effect is poor. The result shows that the gel crosslinking effect is improved along with the improvement of the mass ratio of urushiol.
As can be seen from FIG. 2, 3600-3300cm -1 The absorption peak at the position is the telescopic vibration absorption peak of-OH on the benzene ring of urushiol, which is 2930cm -1 And 1440-1470cm -1 Is characterized in that urushiol is-CH 2 Is a telescopic vibration absorption peak; 3430cm -1 The position is C-O telescopic vibration absorption peak in PVP structure, 1654cm -1 The peak of C=O stretching vibration in PVP structure. The acid-resistant hydrophobic PVP gel prepared in example 1 and the PVP gel prepared in example 2 have characteristic peaks of PVP and urushiol, and the characteristic peaks of PVP do not disappear due to the addition of urushiol, indicating that PVP and urushiol are physically blended rather than chemically blended.
The acid-resistant hydrophobic PVP gel prepared in example 1, the PVP gel prepared in example 2 and the PVP gel prepared in comparative example 1 were subjected to water contact angle test by using a video optical contact angle measuring instrument (dataphysics OCA25-PMC 750), as shown in FIG. 3. As shown in fig. 3 (a), the acid-resistant hydrophobic PVP gel obtained in example 1 had a water contact angle of 79.0 ° after contact with a water droplet for 10min, and was excellent in hydrophobicity. As shown in fig. 3 (b), the PVP gel obtained in example 2 had a water contact angle of 62.8 ° after contact with a water droplet for 10min, and the hydrophobicity was general. As shown in FIG. 3 (c), the PVP gel obtained in comparative example 1 was swollen and dissolved after contacting with water drops for 10 minutes.
Acid resistance tests were performed by taking the acid-resistant hydrophobic PVP gel prepared in example 1 and the PVP gel prepared in example 2 as samples, adhering the samples to two glass rods as shown in FIG. 4, and then dropping a drop of 100% acetic acid into the center of the samples as shown in FIGS. 4 (a 1) and (b 1), and observing after standing for 1 hour as shown in FIGS. 4 (a 2) and (b 2). From the graph, the acid-resistant hydrophobic PVP gel prepared in the example 1 is free from damage and leakage after being contacted with acetic acid for 1h, and is proved to be resistant to acetic acid for more than 1 h. As shown in FIG. 4 (b 2), the PVP gel obtained in example 2 was broken and leaked after being exposed to acetic acid for 1 hour, which proves that the acetic acid resistance was poor.
The acid-resistant hydrophobic PVP gel prepared in example 3 was able to achieve acid resistance and water solubility consistent with the acid-resistant hydrophobic PVP gel prepared in example 1.
The foregoing has described exemplary embodiments of the invention, it being understood that any simple variations, modifications, or other equivalent arrangements which would not unduly obscure the invention may be made by those skilled in the art without departing from the spirit of the invention.
Claims (10)
1. The preparation method of the acid-resistant hydrophobic PVP gel is characterized by comprising the following steps of:
1) PVP and absolute ethyl alcohol are mixed and stirred for at least 6 hours, and then stirred for 3 to 6 hours at the temperature of 30 to 40 ℃ to obtain a first-stage product;
2) Adding urushiol into the first-stage product at 30-40 ℃ until the mass ratio of the urushiol added in the step 2) to PVP in the step 1) is 1:1, stopping adding urushiol, adding absolute ethyl alcohol under stirring, stirring for 6-8 h, preserving heat for 3-6 h at 50-60 ℃, and performing ultrasonic treatment for 10-15 min to obtain a second-stage product;
3) Adding urushiol into the second-stage product at 50-60 ℃ until the mass ratio of the mass of the urushiol added in the step 3) to the mass of PVP in the step 1) is 1: stopping adding urushiol, adding absolute ethyl alcohol under stirring, stirring for 6-8 h, preserving heat for 3-6 h at 70-80 ℃, and performing ultrasonic treatment for 10-15 min to obtain PVP/urushiol hydrogel solution;
4) And drying the PVP/urushiol hydrogel solution to obtain the acid-resistant hydrophobic PVP gel.
2. The preparation method according to claim 1, wherein in step 1), the PVP is 10 to 15wt% of the absolute ethanol in step 1) in parts by mass.
3. The preparation method according to claim 1, wherein the absolute ethyl alcohol added in the step 2) is 10-12% of the absolute ethyl alcohol added in the step 1) in terms of volume fraction.
4. A process according to claim 2 or 3, wherein the absolute ethanol added in step 3) is 5% of the absolute ethanol added in step 1) in parts by volume.
5. The process according to claim 4, wherein in step 2) urushiol is added to the first-stage product at a rate of 0.1 to 0.15g/h; in step 3), urushiol is added to the second stage product at a rate of 0.1 to 0.15g/h.
6. The preparation method according to claim 1, wherein in step 1), the temperature is raised to 30 to 40 ℃ at a rate of 10 to 12 ℃/h; in the step 2), the temperature is raised to 50-60 ℃ at the speed of 10-12 ℃/h; in the step 3), the temperature is raised to 70-80 ℃ at the speed of 10-12 ℃/h; in the step 4), the drying temperature is 60-80 ℃, and the drying time is 4-6 h.
7. The preparation method according to claim 1, wherein the urushiol is obtained by: mixing raw lacquer and absolute ethyl alcohol according to the mass ratio of 1 (3-4), carrying out ultrasonic treatment for 1-1.5 h, filtering impurities, and carrying out rotary evaporation at 180-190 ℃ until the absolute ethyl alcohol is completely evaporated to obtain urushiol.
8. The method of claim 1, wherein in step 1), the at least 6h is from 6 to 8h.
9. An acid-resistant hydrophobic PVP gel obtainable by the method according to any one of claims 1 to 8.
10. Use of the acid-resistant hydrophobic PVP gel of claim 9 for reducing water solubility or improving acid resistance.
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