CN102492247B - Water-resistant polyvinyl alcohol (PVA)-based composite film and preparation method thereof - Google Patents
Water-resistant polyvinyl alcohol (PVA)-based composite film and preparation method thereof Download PDFInfo
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- CN102492247B CN102492247B CN 201110432335 CN201110432335A CN102492247B CN 102492247 B CN102492247 B CN 102492247B CN 201110432335 CN201110432335 CN 201110432335 CN 201110432335 A CN201110432335 A CN 201110432335A CN 102492247 B CN102492247 B CN 102492247B
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- 229920002451 polyvinyl alcohol Polymers 0.000 title claims abstract description 122
- 239000004372 Polyvinyl alcohol Substances 0.000 title claims abstract description 121
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 239000002131 composite material Substances 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000010902 straw Substances 0.000 claims abstract description 44
- 238000000034 method Methods 0.000 claims abstract description 7
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229920003123 carboxymethyl cellulose sodium Polymers 0.000 claims abstract description 6
- 229940063834 carboxymethylcellulose sodium Drugs 0.000 claims abstract description 6
- 239000000945 filler Substances 0.000 claims abstract description 6
- 229910052625 palygorskite Inorganic materials 0.000 claims description 55
- 239000011159 matrix material Substances 0.000 claims description 30
- -1 alcohol group compound Chemical class 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 17
- 239000003795 chemical substances by application Substances 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 14
- 239000000725 suspension Substances 0.000 claims description 12
- 239000004902 Softening Agent Substances 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 10
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 9
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 9
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 9
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 8
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical group OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Natural products CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 7
- 239000002253 acid Substances 0.000 claims description 5
- 235000011187 glycerol Nutrition 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 3
- 235000006408 oxalic acid Nutrition 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 125000000218 acetic acid group Chemical group C(C)(=O)* 0.000 claims description 2
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- 235000010948 carboxy methyl cellulose Nutrition 0.000 abstract description 28
- 230000035699 permeability Effects 0.000 abstract description 9
- 238000002474 experimental method Methods 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 2
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- 238000010345 tape casting Methods 0.000 abstract 2
- 239000000758 substrate Substances 0.000 abstract 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 27
- 239000000243 solution Substances 0.000 description 24
- 238000005303 weighing Methods 0.000 description 10
- 241000196324 Embryophyta Species 0.000 description 7
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- 238000002441 X-ray diffraction Methods 0.000 description 4
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
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- 240000006394 Sorghum bicolor Species 0.000 description 1
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Images
Abstract
The invention provides a water-resistant polyvinyl alcohol (PVA)-based composite film and a preparation method thereof. The water-resistant polyvinyl alcohol-based composite film is a (PVA)-based blended composite film prepared by taking PVA as a substrate and taking carboxymethylcellulose sodium (CMC), paligorskite (PGS) clay and plant straw (ST) as fillers with a tape casting method. As proved by an experiment, the PVA-based composite film has excellent mechanical properties (tensile strength can be up to 10.22-15.87 MPa, and elongation at break is 189.09-436.60 percent) and excellent waterresistance (the water absorbing capacity is less than or equal to 10.5 percent, and moisture permeability is less than or equal to 0.59 g.mm/m<2>.h.KPa), and the application prospect of the PVA-basedcomposite film is expanded; the PGS clay and a large amount of rural waste plant straw are taken as fillers, so that the cost of the PVA-based composite film is reduced greatly; and the PVA-based composite film is prepared with the tape casting method, so that a process is simple, operation is convenient, cost is low, and industrialization is convenient.
Description
Technical field
The invention belongs to technical field of polymer composite materials, relate to a kind of preparation method of polyvinyl alcohol group compound film, relate in particular to a kind of preparation method of water-resistant polyvinyl alcohol group compound film.
Background technology
At present, to take polymkeric substance as matrix, inorganic nano-particle as the research of the novel organic inorganic hybridization polymer composite of weighting material very active.Organic-inorganic hybrid material is compared with traditional matrix material, has realized the chemical bonding between the organic-inorganic, so the aspects such as the mechanical property of gained matrix material, thermotolerance are better than the conventional polymer matrix material of same composition.Such as PVA/PGS nano composite material (people such as Zhiqin Peng, Aligrunent Effect of PGStapulgite on the Mechanical Properties of Poly (vinyl alcohol)/Attapulgite Nanocomposite Fibers, Journal of Polymer Science:Part B:Polymer Physics, 2006,44) in, it is to improve the basic reason of mechanical property that good, the surperficial hydroxyl of palygorskite deployment conditions in the PVA matrix can produce stronger hydrogen bonded with PVA.
Polyvinyl alcohol (PVA) is that a kind of energy is water-soluble, the high molecular polymer of fully biodegradable, and nontoxic, harmless, and cost is lower, can substitute the plastics such as polyvinyl chloride, polystyrene of hard degradation.But contain a large amount of hydroxyls in the polyvinyl alcohol, water resistance is relatively poor, PGS is filled in mechanical property is the raising that has clearly in the PVA matrix, but because the existence of a large amount of hydrophilic radical hydroxyls, water resistance is not fine.Xylo-Mucine is a kind of important ether of cellulose, is a kind of water-soluble preferably polyanionic compound of natural cellulose through obtaining after the chemical modification, and it has advantages of water-retentivity, film forming formability, dispersion stabilization.Therefore, in matrix material, add Xylo-Mucine, be expected to improve the water resistance of polyvinyl alcohol composite material.
Summary of the invention
The objective of the invention is for problems of the prior art, a kind of water-resistant polyvinyl alcohol group compound film is provided.
The preparation method who provides in addition a kind of water-resistant polyvinyl alcohol group compound film with purpose of the present invention.
Water-resistant polyvinyl alcohol group compound film of the present invention, as matrix take polyvinyl alcohol (PVA), take Xylo-Mucine (CMC), palygorskite (PGS) and straw (ST) as filler, the PVA-based blend composite film that adopts casting method to be prepared from, its concrete preparation method comprises following processing step:
(1) granule of polyvinyl alcohol fully is dissolved in the water, is mixed with the polyvinyl alcohol solution of mass concentration 2 ~ 5%;
(2) Xylo-Mucine fully is dissolved in the water, is mixed with the carboxymethylcellulose sodium solution of mass concentration 1 ~ 2.5%;
(3) with straw washing, drying is ground into 300 ~ 500 purpose powder, then is scattered in the water with palygorskite, forms mass concentration at 30 ~ 50% straw-polygorskite suspension;
(4) first with above-mentioned polyvinyl alcohol solution and the abundant mixing of carboxymethylcellulose sodium solution, add straw-palygorskite suspension and softening agent, in 80 ~ 90 ℃ of lower mechanical stirring and ultra-sonic dispersion 15 ~ 30 min, each component is mixed form hybrid films liquid; Be cooled to 30 ~ 60 ℃, add linking agent, regulation system pH=3 ~ 7, stirring reaction 10 ~ 30 min, reverse mould is taken off film behind dry 7 ~ 12h in 50 ~ 80 ℃ of baking ovens, placing relative humidity under the room temperature is 50 ~ 60% environment balance 24 ~ 48 h, obtains the water-resistant polyvinyl alcohol group compound film.
The quality of described Xylo-Mucine is 20 ~ 50% of polyvinyl alcohol; The quality of described palygorskite is 0.6 ~ 6.0% of polyvinyl alcohol; The quality of straw is 1 ~ 5% of polyvinyl alcohol; The quality of softening agent is 10 ~ 40% of polyvinyl alcohol; The quality of linking agent is 2.5 ~ 10% of polyvinyl alcohol.
In the described hybrid films liquid, the total mass concentration of polyvinyl alcohol, Xylo-Mucine, palygorskite and straw is 2.5 ~ 5%.
Described softening agent is glycerine, methyl alcohol, ethanol, ethylene glycol.
Described linking agent is acetic acid, oxalic acid, citric acid, oxysuccinic acid.
Be elaborated below by the properity of experiment to the polyvinyl alcohol based composites of the present invention's preparation.
Below in each experiment, the laminated film of polyvinyl alcohol and Xylo-Mucine is remembered and is PVA/CMC; The laminated film note of polyvinyl alcohol, Xylo-Mucine, palygorskite and stalk is PVA/CMC/PGS/ST; The laminated film note of polyvinyl alcohol, Xylo-Mucine, palygorskite, stalk and linking agent is PCPS.
1, X-ray diffraction analysis (XRD)
Adopt the D/Max-2400X of Rigaku company (Rigaku) diffractometer to characterize matrix material degree of crystallinity.Adopt Cu(
=0.15419) target, graphite monochromator, operating voltage 40 KV, working current 60 mA, 10 °/min of sweep velocity.
Fig. 1 is PVA, CMC, PGS and matrix material PCPS(PGS content 3wt% thereof) XRD spectra (a:PVA; B:PCPS; C:CMC; D:PGS).Can find out from curve a, PVA is that a stronger diffraction peak is arranged about 19.66 ° at 2 θ, corresponding (101) crystal face diffraction of PVA, in addition, for near 11.76o and 22.71 ° two diffraction peaks that can distinguish have appearred also at 2 θ °, respectively corresponding (100) and (200) crystal face diffraction of PVA.Can find out from curve b, the PCPS matrix material is that a stronger diffraction peak is arranged about 19.18 ° at 2 θ, has occurred two diffraction peaks that can distinguish at 2 θ ° near 17.93o and the 31.29o.The diffraction peak of corresponding c curve C MC and d curve PGS as can be known, the diffraction peak of these positions is diffraction peaks of CMC and PGS.This shows, the position of the characteristic diffraction peak of PGS does not change in the matrix material, its spacing does not change yet, the diffraction peak of matrix material is removed the diffraction peak of PGS and CMC, there is not new diffraction peak to occur, and considerable change does not occur in the position of diffraction peak, illustrate that the adding of PGS does not affect the crystalline structure of PVA, but compare with the diffraction peak of pure PVA and CMC, the peak of PCPS diffraction peak descends by force to some extent, but the width at peak reduces to some extent simultaneously, illustrates that the adding of PGS affects to some extent on degree of crystallinity, the lattice dimensions of PVA.
2, scanning electron microscope analysis (SEM)
Adopt NEC JSM-6701F type scanning electronic microscope matrix material to be analyzed operational condition: acceleration voltage 5.0kV, amplify 10000 times.Fig. 2 is the SEM figure of matrix material.A is PVA/CMC matrix material SEM figure, and as can be seen from the figure, the surface of matrix material is more not coarse when adding PGS and ST.B is PVA/CMC/PGS/ST(3wt%PGS, 1.5%ST) the SEM of matrix material figure, compare more smooth that its surface becomes with a, illustrate through after adding PGS and ST, 1-dimention nano fiber PGS is combined with matrix closely, ST fills matrix material preferably, and has shown extraordinary consistency.C is the SEM figure of PCPS matrix material.As can be seen from the figure, PGS substantially is the nano crystal form and is scattered in equably in the matrix material, the PGS nanometer rod is wrapped up fully by PVA and CMC, and in conjunction with very tight, not having obvious separation surface between PGS nanometer rod and the matrix, the ST powder does not present particulate state in stereoscan photograph, demonstrate ST and every between have very good consistency, totally see, behind the adding linking agent, PGS and ST can realize in polymeric matrix that nano level disperses.
3, thermogravimetic analysis (TGA) (TGA)
Adopt Japanese Shimadzu DT-40 type thermal analyzer, nitrogen protection, 10 ℃/min of temperature rise rate, 25 ~ 800 ℃ of temperature ranges.Fig. 3 is matrix material PVA/CMC, PVA/CMC/PGS/ST, the TG curve that reaches PCPS.Can be found out after adding PGS, ST and linking agent by curve, the thermogravimetric curve of matrix material moves to the high temperature direction, the extension initial decomposition temperature of material improves, and namely the thermostability of material improves, and illustrates that the adding of filler can improve the resistance toheat of PCPS matrix material.But because the addition of PGS and ST is less, not clearly so the PCPS matrix material is compared variation with the TG curve of PVA/CMC/PGS/ST, PVA/CMC.
4, Mechanics Performance Testing
Press GB/T1040-1992 (1979) standard test.After tested: tensile strength can reach 10.22 ~ 15.87MPa, and elongation at break is 189.09 ~ 436.60%.
5, water resistance and water vapour permeability test
Water resistance is pressed the GB/T1034-1998 standard test, and water vapour permeability is pressed the GB/T1037-88 standard test.The results are shown in Table 1.
The test of table 1 composite membrane water tolerance and water vapour permeability
As can be seen from Table 1, front and back interpolation PGS compares with the laminated film of ST, under the suitable condition of humidity (RH=68%).The latter's water-intake rate decreases, and the water resistance that has improved laminated film after adding a certain amount of PGS and ST also just is described.Laminated film PCPS is that water-intake rate is lower to be 10.5% under 68% the condition in relative humidity (RH).Comparatively speaking water resistance is better, and it is polyprotonic acid that reason is mainly linking agent, may under certain condition esterification occur with the hydroxyl of polyvinyl alcohol after adding, and can effectively reduce the hydrophilic radical hydroxyl, so water resistance can increase.The water vapor transmission rates of laminated film PCPS is compared with PVA/CMC and is decreased.Also the block-water performance with regard to explanation matrix material after adding linking agent and PGS increases, and the consistency between this sufficient proof CMC and PVA and 1-dimention nano PGS and the ST is better, has improved the density of composite membrane.
In sum, the present invention has the following advantages relatively first:
1, polyvinyl alcohol group compound film of the present invention has excellent mechanical property, water resistance, has expanded the application prospect of polyvinyl alcohol based composites.
2, the present invention take china natural resources abundant inorganic nano material---a large amount of waste plant straws in palygorskite and rural area greatly reduce the cost of polyvinyl alcohol based composites as filler.
3, polyvinyl alcohol group compound film of the present invention adopts casting method to be prepared from, and technique is simple, and is easy to operate, and cost is low, is convenient to industrialization.
Description of drawings
Fig. 1 is X-ray diffraction (XRD) curve of composite membrane of the present invention
Fig. 2 is scanning electron microscope (SEM) figure of composite membrane of the present invention.
Fig. 3 is thermogravimetric (TG) curve of composite membrane of the present invention.
Embodiment
Below by specific embodiment the PVA-based composite manufacture of the present invention and performance are described further.
Embodiment 1
The PVA particle adding distil water of certain mass is made it abundant dissolving in 95 ℃ of lower 3h that stir, be configured to the PVA solution of 2 wt%; Accurately take by weighing the Xylo-Mucine of PVA quality 20%, be configured to the uniform CMC solution of 1wt% with distilled water; Take by weighing the PGS ultra-sonic dispersion of the plant straw powder of PVA quality 1% and PVA quality 0.6 % in water, form the suspension (ST-PGS) of total mass concentration 30%; Behind PVA solution and the abundant mixing of CMC solution, add the ST-PGS suspension agitation and mix formation hybrid films liquid (in the mixing liquid film, the total mass concentration of polyvinyl alcohol, Xylo-Mucine, ST, PGS is 2.5%), the glycerine that adds 10 wt% after evenly to be mixed is made softening agent, and 80 ℃ are stirred 15 min, be cooled to 30 ℃ after, add the oxalic acid of PVA quality 2.5% as linking agent, regulate the pH=3 of mixed solution, crosslinked blending reaction 10 min are after the time, reverse mould.Place baking oven, behind 50 ℃ of drying 7 h, take off film, at room temperature, relative humidity is under the condition of 50 %, measures the performance of film behind the balance 24h.
Measurement result: tensile strength is 15.87MPa, and elongation at break is 189.09 %, and under the condition of relative humidity 50 %, water-intake rate is 10.5%, water vapour permeability 0.59gmm/m
2H KPa.
Embodiment 2
The PVA particle adding distil water of certain mass is made it abundant dissolving in 95 ℃ of lower 3h that stir, be configured to the PVA solution of 5 wt%; Accurately take by weighing the Xylo-Mucine of PVA quality 50%, be configured to the uniform CMC solution of 2.5wt% with distilled water; Take by weighing the PGS ultra-sonic dispersion of the plant straw powder of PVA quality 5% and PVA quality 6 % in water, form the suspension (ST-PGS) of mass concentration 50%; Behind PVA solution and the abundant mixing of CMC solution, add the ST-PGS suspension agitation and mix formation hybrid films liquid (in the mixing liquid film, the total mass concentration of polyvinyl alcohol, Xylo-Mucine, ST, PGS is 5%), the methyl alcohol that adds 50 wt% after evenly to be mixed is made softening agent, and 90 ℃ are stirred 30 min, be cooled to 60 ℃ after, add the acetic acid of PVA quality 10 % as linking agent, regulate the pH=7 of mixed solution, crosslinked blending reaction 30 min are after the time, reverse mould.Place baking oven, behind 80 ℃ of drying 12 h, take off film, at room temperature, relative humidity is under the condition of 60 %, measures the performance of film behind balance 48 h.
Measurement result: tensile strength is 10.22 MPa, and elongation at break is 436.6 %, and under the condition of relative humidity 60 %, water-intake rate is 9.5%, water vapour permeability 0.53 gmm/m
2H KPa.
Embodiment 3
The PVA particle adding distil water of certain mass is made it abundant dissolving in 95 ℃ of lower 3h that stir, be configured to the PVA solution of 3 wt%; Accurately take by weighing the Xylo-Mucine of PVA quality 30%, be configured to the uniform CMC solution of 2 wt% with distilled water; Take by weighing the PGS ultra-sonic dispersion of the plant straw powder of PVA quality 2% and PVA quality 1% in water, form the suspension (ST-PGS) of mass concentration 40%; Behind PVA solution and the abundant mixing of CMC solution, add the ST-PGS suspension agitation and mix formation hybrid films liquid (in the mixing liquid film, the total mass concentration of polyvinyl alcohol, Xylo-Mucine, ST, PGS is 3%), the ethanol that adds 20 wt% after evenly to be mixed is made softening agent, and 80 ℃ are stirred 20 min, be cooled to 40 ℃ after, add the citric acid of PVA quality 4.5 % as linking agent, regulate the pH=4 of mixed solution, crosslinked blending reaction 20 min are after the time, reverse mould.Place baking oven, behind 60 ℃ of drying 9 h, take off film, at room temperature, relative humidity is under the condition of 60 %, measures the performance of film behind balance 48 h.
Measurement result: tensile strength is 12.29 MPa, and elongation at break is 384.49 %, and under the condition of relative humidity 60 %, water-intake rate is 9.1%, water vapour permeability 0.49 gmm/m
2H KPa.
Embodiment 4
The PVA particle adding distil water of certain mass is made it abundant dissolving in 95 ℃ of lower 3h that stir, be configured to the PVA solution of 4 wt%; Accurately take by weighing the Xylo-Mucine of PVA quality 30%, be configured to the uniform CMC solution of 2wt% with distilled water; Take by weighing the PGS ultra-sonic dispersion of the plant straw powder of PVA quality 3% and PVA quality 4% in water, form the suspension (ST-PGS) of mass concentration 35%; Behind PVA solution and the abundant mixing of CMC solution, add the ST-PGS suspension agitation and mix formation hybrid films liquid (in the mixing liquid film, the total mass concentration of polyvinyl alcohol, Xylo-Mucine, ST, PGS is 4%), the glycerine that adds 40 wt% after evenly to be mixed is made softening agent, and 90 ℃ are stirred 25 min, be cooled to 60 ℃ after, add the oxysuccinic acid of PVA quality 5.5 % as linking agent, regulate the pH=5 of mixed solution, crosslinked blending reaction 30 min are after the time, reverse mould.Place baking oven, behind 80 ℃ of drying 10 h, take off film, at room temperature, relative humidity is under the condition of 50 %, measures the performance of film behind balance 24 h.
Measurement result: tensile strength is 13.58 MPa, and elongation at break is 249.12%, and under the condition of relative humidity 50 %, water-intake rate is 8.9%, water vapour permeability 0.51 gmm/m
2H KPa.
Embodiment 5
The PVA particle adding distil water of certain mass is made it abundant dissolving in 95 ℃ of lower 3h that stir, be configured to the PVA solution of 3 wt%; Accurately take by weighing the Xylo-Mucine of PVA quality 35%, be configured to the uniform CMC solution of 1wt% with distilled water; Take by weighing the PGS ultra-sonic dispersion of the plant straw powder of PVA quality 4 % and PVA quality 3.5% in water, form the suspension (ST-PGS) of mass concentration 50%; Behind PVA solution and the abundant mixing of CMC solution, add the ST-PGS suspension agitation and mix formation hybrid films liquid (in the mixing liquid film, the total mass concentration of polyvinyl alcohol, Xylo-Mucine, ST, PGS is 4.5%), the ethylene glycol that adds 30 wt% after evenly to be mixed is made softening agent, and 90 ℃ are stirred 25 min, be cooled to 60 ℃ after, add the oxysuccinic acid of PVA quality 4.5 % as linking agent, regulate the pH=5 of mixed solution, crosslinked blending reaction 30 min are after the time, reverse mould.Place baking oven, behind 80 ℃ of drying 12 h, take off film, at room temperature, relative humidity is under the condition of 60 %, measures the performance of film behind the balance 24h.
Measurement result: tensile strength is 14.73 MPa, and elongation at break is 210.87 %, and under the condition of relative humidity 60 %, water-intake rate is 8.2%, water vapour permeability 0.48 gmm/m
2H KPa.
In the various embodiments described above, plant straw powder be with straw through the washing, drying is ground into 300 ~ 500 purpose powder, wherein straw can adopt maize straw, wheat stalk, broomcorn straw etc.
Claims (3)
1. a water-resistant polyvinyl alcohol group compound film is take polyvinyl alcohol as matrix, take Xylo-Mucine, palygorskite and straw as filler, and the PVA-based blend composite film that adopts casting method to be prepared from; Its concrete preparation technology is as follows:
(1) granule of polyvinyl alcohol fully is dissolved in the water, is mixed with the polyvinyl alcohol solution of mass concentration 2 ~ 5%;
(2) Xylo-Mucine fully is dissolved in the water, is mixed with the carboxymethylcellulose sodium solution of mass concentration 1 ~ 2.5%;
(3) with straw washing, dry, be ground into 300 ~ 500 purpose powder, then be scattered in the water with palygorskite, form mass concentration at 30 ~ 50% straw-polygorskite suspension;
(4) first with above-mentioned polyvinyl alcohol solution and the abundant mixing of carboxymethylcellulose sodium solution, add straw-palygorskite suspension and softening agent, in 80 ~ 90 ℃ of lower mechanical stirring and ultra-sonic dispersion 15 ~ 30 min, each component is mixed form hybrid films liquid; Be cooled to 30 ~ 60 ℃, add linking agent, regulation system pH=3
~7, stirring reaction 10 ~ 30 min, reverse mould is taken off film behind dry 7 ~ 12h in 50 ~ 80 ℃ of baking ovens, and placing relative humidity under the room temperature is 50 ~ 60% environment balance 24 ~ 48 h, obtains the water-resistant polyvinyl alcohol group compound film;
The quality of described Xylo-Mucine is 20 ~ 50 % of polyvinyl alcohol; The quality of described palygorskite is 0.6 ~ 6.0% of polyvinyl alcohol; The quality of straw is 1 ~ 5% of polyvinyl alcohol; The quality of softening agent is 10 ~ 40 % of polyvinyl alcohol; The quality of linking agent is 2.5 ~ 10 % of polyvinyl alcohol; In the hybrid films liquid, the total mass concentration of polyvinyl alcohol, Xylo-Mucine, palygorskite and straw is 2.5 ~ 5%.
2. water-resistant polyvinyl alcohol group compound film as claimed in claim 1, it is characterized in that: described softening agent is glycerine, methyl alcohol, ethanol, ethylene glycol.
3. water-resistant polyvinyl alcohol group compound film as claimed in claim 1, it is characterized in that: described linking agent is acetic acid, oxalic acid, citric acid, oxysuccinic acid.
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| CN109422983A (en) * | 2017-08-25 | 2019-03-05 | 仲恺农业工程学院 | A kind of starch/PVA composite antibacterial preservative film and preparation method thereof |
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