CN105295081A - Polyvinyl alcohol membrane water resistance improving method - Google Patents
Polyvinyl alcohol membrane water resistance improving method Download PDFInfo
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- CN105295081A CN105295081A CN201510816800.5A CN201510816800A CN105295081A CN 105295081 A CN105295081 A CN 105295081A CN 201510816800 A CN201510816800 A CN 201510816800A CN 105295081 A CN105295081 A CN 105295081A
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- polyvinyl alcohol
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- alcohol film
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Abstract
The present invention provides a polyvinyl alcohol membrane water resistance improving method, first, a polyvinyl alcohol water solution is prepared by dissolving polyvinyl alcohol in water, the polyvinyl alcohol water solution is mixed with tin tetrachloride for reaction of the tin tetrachloride and the polyvinyl alcohol, the pH value of the reaction product is adjusted to weak acid to weak alkaline, and the reaction product is flow-casted into a membrane on a Teflon plate to obtain a polyvinyl alcohol membrane with improved water resistance. According to the method, the polyvinyl alcohol is modified by the tin tetrachloride, tin ions have strong coordinating ability, the membrane formed by the complex generated by the reaction of the tin tetrachloride and the polyvinyl alcohol solution can be is stable in water solution, so that the polyvinyl alcohol membrane water resistance is improved. The preparation method is simple in process, low in cost and suitable for industrial mass production, and the water resistance of the polyvinyl alcohol membrane modified by the method is remarkably improved.
Description
Technical field
The invention belongs to Material Field, be specifically related to a kind of method improving polyvinyl alcohol film water tolerance.
Background technology
Polyvinyl alcohol is a kind of hydrophilic semi-crystalline, has heat-resisting, wear-resisting, the performance such as grease resistance, solvent resistant, corrosion resistant candle, ultraviolet light resistant of good water-soluble, film-forming properties, cohesiveness, emulsifying property and brilliance.And colorless and odorless, non-corrosiveness, biodegradable, to skin without excitatory, can not cause allergic.Through fast development in decades, polyvinyl alcohol is own through becoming the maximum water soluble organic polymer polymkeric substance of output in the world, at present except being used as vinylon raw material, be also widely used in the industrial circles such as sizing agent, emulsifying agent, dispersion agent, slurry, coating, papermaking, film.
The viscosity of the solvability of polyvinyl alcohol in water and the aqueous solution thereof is with the size of its polymerization degree, the height of alcoholysis degree and changing.Polyvinyl alcohol with low degree of polymerization is dissolved in the solution that cold water can obtain 20% ~ 30%; The polyvinyl alcohol of high-polymerization degree can only be dissolved in hot water, makes the solution of 10% ~ 15%, but can condense after cooling.
Polyvinyl alcohol (PVA) is a kind of high molecular polymer of fully biodegradable, can substitute the plastics such as polyvinyl chloride, polystyrene being difficult to degrade, become excellent plastics film.But pure PVA (PVOH) FILM is very easily water-soluble, limit the application of polyvinyl alcohol.
Summary of the invention
The object of the present invention is to provide a kind of method improving polyvinyl alcohol film water tolerance, the method technique is simple, and the water tolerance of the polyvinyl alcohol film utilizing the method modified significantly improves.
For achieving the above object, the technical solution used in the present invention is:
Improve a method for polyvinyl alcohol film water tolerance, comprise the following steps:
1) be 1:(8 ~ 12 in mass ratio) polyvinyl alcohol is added to the water, heated and stirred, to polyvinyl alcohol dissolution, obtains polyvinyl alcohol solution;
2) be 1:(0.5 ~ 1:1 in mass ratio) by polyvinyl alcohol solution and SnCl
4mixing, carries out modified-reaction, and reaction terminates pH=5 ~ 8 of rear adjustment reaction product, obtains modified poly ethylene alcoholic solution;
3) modified poly ethylene alcoholic solution is coated in casting film-forming on polyfluortetraethylene plate, obtains water-fast polyvinyl alcohol film.
The model of described polyvinyl alcohol is PVA-1788.
Described step 1) in Heating temperature be 60 ~ 85 DEG C.
Described step 1) in stirring velocity be 900 ~ 1200r/min.
Described step 2) in modified-reaction be at 40 ~ 70 DEG C react 30 ~ 120min.
Described step 2) in use ammoniacal liquor adjust ph.
Relative to prior art, the present invention has following beneficial effect:
The method of raising polyvinyl alcohol film water tolerance provided by the invention, first polyvinyl alcohol dissolution is made polyvinyl alcohol solution in water, then polyvinyl alcohol solution is mixed with tin tetrachloride, polyvinyl alcohol and tin tetrachloride are reacted, the pH value regulating reaction product is that weak acid is to weakly alkaline, casting film-forming on polyfluortetraethylene plate again, be improved the polyvinyl alcohol film of water tolerance.Carry out modification by tin tetrachloride to polyvinyl alcohol in the method, because tin ion has stronger coordination ability, reacting after the title complex film forming generated with polyvinyl alcohol solution can stable existence in aqueous, therefore, it is possible to improve the water tolerance of polyvinyl alcohol film.The method preparation technology is simple, low production cost, and be suitable for industrialization scale operation, the water tolerance of the polyvinyl alcohol film utilizing the method modified significantly improves.
Accompanying drawing explanation
Fig. 1 is the contact angle test pattern of polyvinyl alcohol film, and wherein (a) is unmodified polyvinyl alcohol film, and (b) is the modified polyvinyl alcohol film of the present invention;
Fig. 2 is the water-fast test result figure of polyvinyl alcohol film, and wherein (a) is unmodified polyvinyl alcohol film, and (b) is the modified polyvinyl alcohol film of the present invention.
Embodiment
Below in conjunction with the present invention preferably embodiment the present invention is described in further details.
Embodiment 1:
1) by the mass ratio of 1:10, PVAC polyvinylalcohol-1788 is mixed with water at 70 DEG C, and make polyvinyl alcohol dissolution with the stirring of the speed of 900r/min, obtain transparent polyvinyl alcohol solution;
2) by polyvinyl alcohol solution and SnCl
4mix by the mass ratio of 1:0.6, then at 50 DEG C, react 30min, reaction terminates the pH=6 that rear ammoniacal liquor regulates reaction product, obtains modified poly ethylene alcoholic solution;
3) modified poly ethylene alcoholic solution is coated in casting film-forming on polyfluortetraethylene plate, obtains water-fast polyvinyl alcohol film.
Embodiment 2:
1) by the mass ratio of 1:8, PVAC polyvinylalcohol-1788 is mixed with water at 85 DEG C, and make polyvinyl alcohol dissolution with the stirring of the speed of 1000r/min, obtain transparent polyvinyl alcohol solution;
2) by polyvinyl alcohol solution and SnCl
4mix by the mass ratio of 1:0.7, then at 45 DEG C, react 60min, reaction terminates the pH=7 that rear ammoniacal liquor regulates reaction product, obtains modified poly ethylene alcoholic solution;
3) modified poly ethylene alcoholic solution is coated in casting film-forming on polyfluortetraethylene plate, obtains water-fast polyvinyl alcohol film.
Embodiment 3:
1) by the mass ratio of 1:9, PVAC polyvinylalcohol-1788 is mixed with water at 80 DEG C, and make polyvinyl alcohol dissolution with the stirring of the speed of 1100r/min, obtain transparent polyvinyl alcohol solution;
2) by polyvinyl alcohol solution and SnCl
4mix by the mass ratio of 1:0.9, then at 60 DEG C, react 120min, reaction terminates the pH=8 that rear ammoniacal liquor regulates reaction product, obtains modified poly ethylene alcoholic solution;
3) modified poly ethylene alcoholic solution is coated in casting film-forming on polyfluortetraethylene plate, obtains water-fast polyvinyl alcohol film.
Embodiment 4:
1) by the mass ratio of 1:12, PVAC polyvinylalcohol-1788 is mixed with water at 75 DEG C, and make polyvinyl alcohol dissolution with the stirring of the speed of 1200r/min, obtain transparent polyvinyl alcohol solution;
2) by polyvinyl alcohol solution and SnCl
4mix by the mass ratio of 1:1.0, then at 70 DEG C, react 90min, reaction terminates the pH=6 that rear ammoniacal liquor regulates reaction product, obtains modified poly ethylene alcoholic solution;
3) modified poly ethylene alcoholic solution is coated in casting film-forming on polyfluortetraethylene plate, obtains water-fast polyvinyl alcohol film.
Embodiment 5:
1) by the mass ratio of 1:11, PVAC polyvinylalcohol-1788 is mixed with water at 85 DEG C, and make polyvinyl alcohol dissolution with the stirring of the speed of 950r/min, obtain transparent polyvinyl alcohol solution;
2) by polyvinyl alcohol solution and SnCl
4mix by the mass ratio of 1:1.1, then at 65 DEG C, react 60min, reaction terminates the pH=5 that rear ammoniacal liquor regulates reaction product, obtains modified poly ethylene alcoholic solution;
3) modified poly ethylene alcoholic solution is coated in casting film-forming on polyfluortetraethylene plate, obtains water-fast polyvinyl alcohol film.
Embodiment 6
1) by the mass ratio of 1:9.5, PVAC polyvinylalcohol-1788 is mixed with water at 60 DEG C, and make polyvinyl alcohol dissolution with the stirring of the speed of 1050r/min, obtain transparent polyvinyl alcohol solution;
2) by polyvinyl alcohol solution and SnCl
4mix by the mass ratio of 1:0.5, then at 40 DEG C, react 100min, reaction terminates the pH=6.5 that rear ammoniacal liquor regulates reaction product, obtains modified poly ethylene alcoholic solution;
3) modified poly ethylene alcoholic solution is coated in casting film-forming on polyfluortetraethylene plate, obtains water-fast polyvinyl alcohol film.
Performance test is carried out to the polyvinyl alcohol film of modification of the present invention:
1, the water tolerance of contact angle instrument to polyvinyl alcohol film is utilized to measure.
Can find out that the contact angle of unmodified pure polyvinyl alcohol film is 64.0 ° by Fig. 1 (a), and SnCl provided by the invention can be found out by Fig. 1 (b)
4the contact angle of modified polyvinyl alcohol film is 89.62 °.It can be said that the water tolerance of the polyvinyl alcohol film that bright the present invention is modified is significantly improved.
2, by soaking in distilled water, the water tolerance of polyvinyl alcohol film is measured.
Fig. 2 (a) soaks the state after 30min for unmodified pure polyvinyl alcohol film in water, can find out that unmodified pure polyvinyl alcohol film is completely water-soluble, Fig. 2 (b) soaks the state after two weeks for modified polyvinyl alcohol film provided by the invention in water, can find out that modified polyvinyl alcohol film still presents membranaceous.It can be said that the water tolerance of the bright polyvinyl alcohol film through modification of the present invention substantially increases.
Claims (6)
1. improve a method for polyvinyl alcohol film water tolerance, it is characterized in that, comprise the following steps:
1) be 1:(8 ~ 12 in mass ratio) polyvinyl alcohol is added to the water, heated and stirred, to polyvinyl alcohol dissolution, obtains polyvinyl alcohol solution;
2) be 1:(0.5 ~ 1:1 in mass ratio) by polyvinyl alcohol solution and SnCl
4mixing, carries out modified-reaction, and reaction terminates pH=5 ~ 8 of rear adjustment reaction product, obtains modified poly ethylene alcoholic solution;
3) modified poly ethylene alcoholic solution is coated in casting film-forming on polyfluortetraethylene plate, obtains water-fast polyvinyl alcohol film.
2. the method for raising polyvinyl alcohol film water tolerance according to claim 1, is characterized in that, the model of described polyvinyl alcohol is PVA-1788.
3. the method for raising polyvinyl alcohol film water tolerance according to claim 1, is characterized in that, described step 1) in Heating temperature be 60 ~ 85 DEG C.
4. the method for raising polyvinyl alcohol film water tolerance according to claim 1, is characterized in that, described step 1) in stirring velocity be 900 ~ 1200r/min.
5. the method for raising polyvinyl alcohol film water tolerance according to claim 1, is characterized in that, described step 2) in modified-reaction be at 40 ~ 70 DEG C react 30 ~ 120min.
6. the method for raising polyvinyl alcohol film water tolerance according to claim 1, is characterized in that, described step 2) in use ammoniacal liquor adjust ph.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510816800.5A CN105295081A (en) | 2015-11-20 | 2015-11-20 | Polyvinyl alcohol membrane water resistance improving method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510816800.5A CN105295081A (en) | 2015-11-20 | 2015-11-20 | Polyvinyl alcohol membrane water resistance improving method |
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| CN105295081A true CN105295081A (en) | 2016-02-03 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113372595A (en) * | 2021-07-31 | 2021-09-10 | 贵州省材料产业技术研究院 | Rare earth metal complexing polyvinyl alcohol film and preparation method thereof |
| CN113637098A (en) * | 2021-08-13 | 2021-11-12 | 温州医科大学 | Modified polyvinyl alcohol and preparation method and application thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103525360A (en) * | 2013-09-26 | 2014-01-22 | 陕西科技大学 | Preparation method of hydrophobic bone glue |
| CN103694930A (en) * | 2013-12-20 | 2014-04-02 | 陕西科技大学 | Method for preparing waterproof polyvinyl alcohol trademark adhesive |
-
2015
- 2015-11-20 CN CN201510816800.5A patent/CN105295081A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103525360A (en) * | 2013-09-26 | 2014-01-22 | 陕西科技大学 | Preparation method of hydrophobic bone glue |
| CN103694930A (en) * | 2013-12-20 | 2014-04-02 | 陕西科技大学 | Method for preparing waterproof polyvinyl alcohol trademark adhesive |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113372595A (en) * | 2021-07-31 | 2021-09-10 | 贵州省材料产业技术研究院 | Rare earth metal complexing polyvinyl alcohol film and preparation method thereof |
| CN113637098A (en) * | 2021-08-13 | 2021-11-12 | 温州医科大学 | Modified polyvinyl alcohol and preparation method and application thereof |
| CN113637098B (en) * | 2021-08-13 | 2024-03-29 | 温州医科大学 | Modified polyvinyl alcohol and preparation method and application thereof |
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Application publication date: 20160203 |