CN103483598A - Method for accelerating polyvinyl alcohol dissolution - Google Patents
Method for accelerating polyvinyl alcohol dissolution Download PDFInfo
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- CN103483598A CN103483598A CN201310444009.7A CN201310444009A CN103483598A CN 103483598 A CN103483598 A CN 103483598A CN 201310444009 A CN201310444009 A CN 201310444009A CN 103483598 A CN103483598 A CN 103483598A
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Abstract
The invention discloses a method for accelerating polyvinyl alcohol dissolution. Mechanical activation is adopted to treat the polyvinyl alcohol, the molecular structure of the polyvinyl alcohol is broken, a solid micromolecular solvent is added when the mechanical activation is carried out, the solid micromolecular solvent permeates into polyvinyl alcohol molecules, the polyvinyl alcohol molecules are enabled to be carried out solid phase swelling, so that quick dissolution of the polyvinyl alcohol is realized. The method adopted by the invention is low in energy consumption, short in time consumption, simple and convenient to operate, pollution-free, does not need high temperature and high pressure, and belongs to environment friendly methods; the mechanical activation is adopted to treat the polyvinyl alcohol, hydrogen bonds and crystalline structures between polyvinyl alcohol molecules are broken in advance, and the dissolution time of the polyvinyl alcohol is effectively shortened; the polyvinyl alcohol is enabled to be subjected to solid phase swelling, and the reaction time of the polyvinyl alcohol and a liquid solvent is shortened; during the dissolution process, a solid solvent and the liquid solvent are relatively permeated, and the dissolution efficiency of the polyvinyl alcohol is greatly improved; meanwhile the method is wide in applicability, can effectively improve the solubility of the water-soluble polymer, and particularly has an obvious function on polyol.
Description
Technical field
The invention belongs to polymeric material field, be specifically related to a kind of mechanical activation and solid phase swelling of adopting and accelerate the method that polyvinyl alcohol dissolves.
Background technology
Polyvinyl alcohol (Polyvinyl alcohol, PVA) is a kind of non-toxic water soluble high molecular polymer, is widely used in the fields such as fiber, film, medicine, tackiness agent.Polyvinyl alcohol is a kind of polyol, and wetting ability is very strong, but granule of polyvinyl alcohol is insoluble in water, serious restriction application and the development of polyvinyl alcohol.The dissolution process complexity of polyvinyl alcohol in water, and with the difference of its polymerization degree, alcoholysis degree, very large difference is arranged.Trace it to its cause be due between polyvinyl alcohol molecule and intramolecular hydrogen bond association and the height crystallinity cause.Therefore, exploring the method for the quick dissolve polyvinyl alcohol of a kind of energy, is the large practical problems that current industrial production faces.
For quick dissolve polyvinyl alcohol, existing scholar is explored from the preparatory phase of polyvinyl alcohol.For example Chinese patent CN 102827316 A disclose a kind of preparation method of low crystallinity polyethylene alcohol.The method comprises the processes such as polymerization, alcoholysis and dry each unit, and the polyvinyl alcohol work in-process after alcoholysis, in 30～120 ℃ of lower warm air dryings, are obtained to the polyvinyl alcohol of low-crystallinity in 0.5～5 hour, and the products made thereby solubility property increases.This method is explored from the preparatory phase of polyvinyl alcohol, and for the difficult problem of the dissolving of polyvinyl alcohol finished product, and inapplicable.
At present, the dissolving method that the polyvinyl alcohol finished product is commonly used has heated and stirred method and modification method.The heated and stirred method is that high temperature is hotted plate, high-speed stirring, and dissolution process reaches 2～4 hours, and energy consumption is high; The modification rule is to introduce some hydrophilic radicals to polyvinyl alcohol molecule, enhanced polyethylene alcohol water-soluble, dissolve difficult problem though this method can solve polyvinyl alcohol, generally, the group of introducing easily affects other performances of polyvinyl alcohol, for example degradation under sticky stickiness, perviousness.Therefore, finding low, the consuming time short and dissolving method that do not reduce the polyvinyl alcohol excellent properties of a kind of new energy consumption has important practical significance.
Summary of the invention
For above-mentioned the deficiencies in the prior art part, the invention provides a kind of method that polyvinyl alcohol dissolves the acceleration polyvinyl alcohol dissolving that power consumption is high, the time is long that is intended to solve.
In order to solve the problems of the technologies described above, the present invention has adopted following technical scheme:
A kind of method of accelerating the polyvinyl alcohol dissolving, adopt mechanical activation to be processed polyvinyl alcohol, destroy its molecular structure, add the solid small molecule solvent in mechanical activation, the solid small molecule solvent penetrates in polyvinyl alcohol molecule, make it that solid phase swelling occur, thereby realize quick dissolve polyvinyl alcohol.
As a preferred embodiment of the present invention, described mechanical activation comprises two stages: the treatment stage of pretreatment stage and mechanical force;
Described pretreatment stage refers to polyvinyl alcohol is carried out to pre-treatment through microwave, rayed, ultrasonic, electric field or magnetic field;
The treatment stage of described mechanical force, refer to the polyvinyl alcohol through pretreated rubbed, collided, impact or shearing mechanism power processes.
As another kind of preferred version of the present invention, described molecular structure is hydrogen bond structure and crystalline texture.
As another preferred version of the present invention, the solid phase swelling refers to the spontaneous or non-spontaneous polymer molecule interchain that enters of solid small-molecule substance, weaken or destroy the reactive force of polymer molecule interchain, or be inserted in the lattice of polymkeric substance, make the lattice distortion of polymkeric substance, expansion to a certain degree occurs in the volume of polymkeric substance.
As a modification of the present invention scheme, polyvinyl alcohol is carried out to the solid phase swelling treatment to be referred to the solid small molecule solvent is mixed with polyvinyl alcohol, in the mechanical activation process, the solid small-molecule substance enters between the molecular chain of polyvinyl alcohol, weaken or destroy the reactive force of polyvinyl alcohol molecule interchain, or be inserted in the lattice of polyvinyl alcohol, making the lattice distortion of polyvinyl alcohol, expansion to a certain degree occurs in the volume of polyvinyl alcohol.
As another kind of improvement project of the present invention, described solid small molecule solvent is to have strong polarity or strong infiltrative material.
As another improvement project of the present invention, polyvinyl alcohol dissolves and refers to that polyvinyl alcohol is dissolved at 30～95 ℃.
Scheme as a further improvement on the present invention, polyvinyl alcohol is the polyvinyl alcohol after mechanical activation and solid phase swelling treatment.
Compared with prior art, the present invention has following beneficial effect:
1, the method applied in the present invention energy consumption is low, consuming time short, easy and simple to handle, pollution-free, without High Temperature High Pressure, belongs to environmentally friendly method.
2, the present invention adopts mechanical activation to process polyvinyl alcohol, has destroyed in advance hydrogen bond and crystalline texture between polyvinyl alcohol molecule, has effectively shortened the dissolution time of polyvinyl alcohol.
3, the present invention makes polyvinyl alcohol generation solid phase swelling, has shortened the time with the liquid solvent effect.
4, the polyvinyl alcohol of processing through the inventive method, in dissolution process, two kinds of solvent phase of solid-liquid, to infiltration, have improved the dissolved efficiency of polyvinyl alcohol greatly.
5, the method for the invention suitability is wide, can effectively improve the solvability of water-soluble polymers, especially obvious to the polyol effect.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.
A kind of method of accelerating the polyvinyl alcohol dissolving, adopt mechanical activation to be processed 3min～5min to polyvinyl alcohol; Then pretreated polyvinyl alcohol is evenly mixed with the solid small molecule solvent, carry out mechanical force and process 30min～60min; Polyvinyl alcohol after mechanical activation and solid phase swelling treatment is added to deionized water, dissolved at 30～95 ℃.
Wherein, adopt the mechanical activation method to process polyvinyl alcohol (PVA), mechanical activation comprises two stages: the treatment stage of pretreatment stage and mechanical force.Pretreatment stage refers to polyvinyl alcohol carried out to pre-treatment through microwave, rayed, ultrasonic, electric field or magnetic field etc., and the toughness of PVA is reduced, and fragility increases, and for mechanical force, processes and prepares.Refer to the treatment stage of mechanical force the polyvinyl alcohol through pretreated is rubbed, collides, impacts or the mechanical force such as shearing is processed, the mechanical force treatment facility comprises stone mill, ball mill, pulverizer etc., principle according to energy conservation, mechanical energy changes the interior energy of polyvinyl alcohol into, can improve, increased activity, polymer stabilizing weakens, the order of its structure is weakened, intermolecular hydrogen bond association weakens, degree of crystallinity reduces, thereby reach the purpose of quick dissolving PVA.
Adopt solid phase swelling treatment PVA, make between the spontaneous or non-spontaneous molecular chain that enters polyvinyl alcohol of solid small-molecule substance, weaken or destroy the reactive force of polyvinyl alcohol molecule interchain, or be inserted in the lattice of polyvinyl alcohol, make the lattice distortion of polyvinyl alcohol, expansion to a certain degree occurs in the volume of polyvinyl alcohol.Make its molecular structure, especially hydrogen bond and crystalline texture are destroyed.Also the solid small molecule solvent can be mixed with polyvinyl alcohol, in the mechanical activation process, the solid small-molecule substance enters between the molecular chain of polyvinyl alcohol, weaken or destroy the reactive force of polyvinyl alcohol molecule interchain, or be inserted in the lattice of polyvinyl alcohol, make the lattice distortion of polyvinyl alcohol, expansion to a certain degree occurs in the volume of polyvinyl alcohol.
Carry out the solid phase swelling in the time of to the polyvinyl alcohol mechanical activation, the two is mutually promoted, and can destroy to the full extent crystalline texture and the hydrogen bond association of polyvinyl alcohol, thereby further accelerates the dissolving of PVA.The solid small molecule solvent is to have strong polarity or strong infiltrative material.Polyvinyl alcohol is the polyvinyl alcohol after mechanical activation and solid phase swelling treatment.
Embodiment mono-
Take 30gPVA, ultrasonic pretreatment 4min, then, with after the mixing of 0.03g urea and 0.05g nitroso-group ethene, with stone mill, mixture is carried out to activation treatment 30min, get the mixture after 20g processes, and adds the water of 280g, then be warming up to 30 ℃ and dissolved.
Embodiment bis-
Take 30gPVA, put into microwave oven and process 4min, then with after the mixing of 0.25g urea and 0.3g Nitromethane 99Min., with ball mill, mixture is carried out to activation treatment 35min, mixture after getting 20g and processing, add the water of 280g, then be warming up to 45 ℃ and dissolved.
Embodiment tri-
Take 30gPVA, photo-irradiation treatment 5min, then, with after 0.5g trimeric cyanamide and 0.8g Nitromethane 99Min. mix, with pulverizer, mixture is carried out to activation treatment 40min, get the mixture after 20g processes, and adds the water of 280g, then be warming up to 65 ℃ and dissolved.
Embodiment tetra-
Take 30gPVA, electric field treatment 5min, then, with after the mixing of 0.8g trimeric cyanamide and 1.5g urea, with stone mill, mixture is carried out to activation treatment 45min, get the mixture after 20g processes, and adds the water of 280g, then be warming up to 85 ℃ and dissolved.
Embodiment five
Take 30gPVA, put into magnetic field and process 3min, then with after the mixing of 1.2g trimeric cyanamide and 2g nitroso-group ethene, with pulverizer, mixture is carried out to activation treatment 50min, mixture after getting 20g and processing, add the water of 280g, then be warming up to 95 ℃ and dissolved.
Finally explanation is, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to preferred embodiment, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not breaking away from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (8)
1. one kind is accelerated the method that polyvinyl alcohol dissolves, it is characterized in that, adopt mechanical activation to be processed polyvinyl alcohol, destroy its molecular structure, add the solid small molecule solvent in mechanical activation, the solid small molecule solvent penetrates in polyvinyl alcohol molecule, makes it that solid phase swelling occur, thereby realizes quick dissolve polyvinyl alcohol.
2. a kind of method that polyvinyl alcohol dissolves of accelerating according to claim 1, is characterized in that, described mechanical activation comprises two stages: the treatment stage of pretreatment stage and mechanical force;
Described pretreatment stage refers to polyvinyl alcohol is carried out to pre-treatment through microwave, rayed, ultrasonic, electric field or magnetic field;
The treatment stage of described mechanical force, refer to the polyvinyl alcohol through pretreated rubbed, collided, impact or shearing mechanism power processes.
3. a kind of method that polyvinyl alcohol dissolves of accelerating according to claim 1, is characterized in that, described molecular structure is hydrogen bond structure and crystalline texture.
4. a kind of method that polyvinyl alcohol dissolves of accelerating according to claim 1, it is characterized in that, the solid phase swelling refers to the spontaneous or non-spontaneous polymer molecule interchain that enters of solid small-molecule substance, weaken or destroy the reactive force of polymer molecule interchain, or be inserted in the lattice of polymkeric substance, make the lattice distortion of polymkeric substance, expansion to a certain degree occurs in the volume of polymkeric substance.
5. a kind of method that polyvinyl alcohol dissolves of accelerating according to claim 1, it is characterized in that, polyvinyl alcohol is carried out to the solid phase swelling treatment to be referred to the solid small molecule solvent is mixed with polyvinyl alcohol, in the mechanical activation process, the solid small-molecule substance enters between the molecular chain of polyvinyl alcohol, weakens or destroy the reactive force of polyvinyl alcohol molecule interchain, or is inserted in the lattice of polyvinyl alcohol, make the lattice distortion of polyvinyl alcohol, expansion to a certain degree occurs in the volume of polyvinyl alcohol.
6. a kind of method that polyvinyl alcohol dissolves of accelerating according to claim 1, is characterized in that, described solid small molecule solvent is to have strong polarity or strong infiltrative material.
7. a kind of method that polyvinyl alcohol dissolves of accelerating according to claim 1, is characterized in that, polyvinyl alcohol dissolves and refers to that polyvinyl alcohol is dissolved at 30～95 ℃.
8. a kind of method that polyvinyl alcohol dissolves of accelerating according to claim 1, is characterized in that, polyvinyl alcohol is the polyvinyl alcohol after mechanical activation and solid phase swelling treatment.
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| CN201310444009.7A CN103483598B (en) | 2013-09-26 | 2013-09-26 | Method for accelerating polyvinyl alcohol dissolution |
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| CN201310444009.7A CN103483598B (en) | 2013-09-26 | 2013-09-26 | Method for accelerating polyvinyl alcohol dissolution |
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| CN103483598B CN103483598B (en) | 2015-06-03 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107216464A (en) * | 2017-06-14 | 2017-09-29 | 荆州市九天化工科技有限公司 | A kind of preparation method of rapidly-soluble polyvinyl alcohol |
| CN109054265A (en) * | 2018-07-26 | 2018-12-21 | 上海全宇生物科技遂平有限公司 | A method of preparing expanded polyethylene alcohol |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05245138A (en) * | 1992-03-03 | 1993-09-24 | Terumo Corp | Production of polyvinyl alcohol gel for ultrasonic medium |
| CN101250237A (en) * | 2008-03-31 | 2008-08-27 | 浙江工业大学 | Non-solvent ectraction method of chondroitin sulfate |
-
2013
- 2013-09-26 CN CN201310444009.7A patent/CN103483598B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05245138A (en) * | 1992-03-03 | 1993-09-24 | Terumo Corp | Production of polyvinyl alcohol gel for ultrasonic medium |
| CN101250237A (en) * | 2008-03-31 | 2008-08-27 | 浙江工业大学 | Non-solvent ectraction method of chondroitin sulfate |
Non-Patent Citations (1)
| Title |
|---|
| CHUNTANG LEI ET AL.: ""Effect of Interactions Between Poly(vinyl alcohol)and Urea on the Water Solubility of Poly(vinyl alcohol)"", 《JOURNAL OF APPLIED POLYMER SCIENCE》, vol. 114, 8 June 2009 (2009-06-08) * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107216464A (en) * | 2017-06-14 | 2017-09-29 | 荆州市九天化工科技有限公司 | A kind of preparation method of rapidly-soluble polyvinyl alcohol |
| CN107216464B (en) * | 2017-06-14 | 2018-06-01 | 荆州市九天化工科技有限公司 | A kind of preparation method of rapidly-soluble polyvinyl alcohol |
| CN109054265A (en) * | 2018-07-26 | 2018-12-21 | 上海全宇生物科技遂平有限公司 | A method of preparing expanded polyethylene alcohol |
| CN109054265B (en) * | 2018-07-26 | 2021-02-05 | 上海全宇生物科技遂平有限公司 | Method for preparing expanded polyvinyl alcohol |
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