CN104211978A - Nanocrystalline composite membrane of pea starch and waxy corn starch and preparation method of nanocrystalline composite membrane - Google Patents
Nanocrystalline composite membrane of pea starch and waxy corn starch and preparation method of nanocrystalline composite membrane Download PDFInfo
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- CN104211978A CN104211978A CN201410458744.8A CN201410458744A CN104211978A CN 104211978 A CN104211978 A CN 104211978A CN 201410458744 A CN201410458744 A CN 201410458744A CN 104211978 A CN104211978 A CN 104211978A
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Abstract
The invention discloses a preparation method of a nanocrystalline composite membrane of pea starch and waxy corn starch. The method comprises the following steps: (1) stirring and heating a water solution containing 0.047% of pea starch and 0.023% of glycerinum by mass in a boiling water bath for 40-50 minutes and then cooling to 45-55 DEG C; (2) adding WMSNC to the solution obtained in the step (1), wherein the additive amount of the WMSNC is 1%-9% of dry basis content of PS; (3) magnetically mixing and stirring the solution obtained in the step (2) for 25-35 minutes, then pouring into a suction flask, and degassing for 6-15 minutes by using a vacuum pump of which the vacuum degree is 1.0MPa, thereby obtaining composite membrane liquid; and (4) paving the composite membrane liquid on a flat dish, and drying in a constant-temperature drying oven with 35-45 DEG C, thereby obtaining the composite membrane. After the WMSNC is added, TS and M of the composite membrane are increased while E is reduced, the permeation coefficient and the permeation rate are obviously reduced, the pure PS membrane is flat and smooth in surface, and the surface of the composite membrane gradually becomes coarse along with increase of the additive amount of the WMSNC.
Description
Technical field
The present invention relates to a kind of pea starch and waxy corn starch nanocomposite film and preparation method thereof.
Background technology
The pea starch film of single component has wetting ability by force, the shortcomings such as bad mechanical property.Research finds, in order to improve the performance of starch film, can by adding polyose Nano filling, it not only has renewable and biodegradable feature, and compact structure, rigidity greatly, be the desirable performance improver of starch film.
Cellulose nanocrystal, is a kind of Nano filling of most study up to now, has become the commercial goods of improving biodegradable film material.But due to the advantage such as starch source is extensive, cheap, biodegradable, nanometer starch crystal becomes the study hotspot that nano-filled material is new in recent years.Waxy corn starch, compared to other common starch, due to its amylopectin starch content almost 100%, can be called as and prepare the optimum raw material of nanometer starch crystal.
Find not yet have the nanocrystalline associating pea starch of waxy corn starch to prepare the relevant report of composite membrane by consulting domestic and international pertinent literature collection patent.
Summary of the invention
Object of the present invention is just to provide a kind of pea starch and waxy corn starch nanocomposite film and preparation method thereof.
To achieve these goals, the present invention adopts following technical scheme:
A preparation method for pea starch and waxy corn starch nanocomposite film, comprises the following steps:
(1) will be containing massfraction the pea starch (PS) of 0.047%, massfraction is the aqueous solution of the glycerine of 0.023%, is cooled to 45-55 DEG C (preferably 50 DEG C) after boiling water bath stirring heating 40-50min (preferred 45min);
(2) in step (1) gained solution, add WMSNC (waxy corn starch is nanocrystalline), the add-on of described WMSNC is the 1%-9% of PS contents on dry basis;
(3) will pour in filter flask after step (2) gained solution magnetic force mix and blend 25-35min (preferred 30min), with the degassed 6-15min of vacuum pump (preferred 10min) that vacuum tightness is 1.0MPa, obtain composite membrane liquid;
(4) get above-mentioned composite membrane liquid to be laid on plane ware, the thermostatic drying chamber being placed in 35-45 DEG C (preferably 40 DEG C) is drying to obtain composite membrane.
The preparation method of above-mentioned waxy corn starch nanocrystalline (Waxy maize starch nanocrystals, WMSNC) is as follows:
Waxy corn starch is dissolved in the H of 3.16M
2sO
4in solution, the concentration of described waxy corn starch is 146.9g/L, in 35-45 DEG C (preferably 40 DEG C) stirring in water bath (100rad/min) 5 days, then by extremely neutral for the continuous centrifuge washing repeatedly of suspension distilled water obtained, then it is nanocrystalline namely neutral solution to be obtained in vacuum freeze drier waxy corn starch after freeze-drying.
The composite membrane that the preparation method of above-mentioned composite membrane obtains.
Beneficial effect of the present invention:
1, by adding WMSNC by film, the tensile strength of composite membrane, the moisture content of film, coefficient of permeability and permeation rate are all significantly improved.
2, after adding WMSNC, TS and M of composite membrane increases, and E reduces.
3, the interpolation of WMSNC makes the moisture content of composite membrane, and coefficient of permeability and permeation rate significantly reduce.
4, pure PS film surfacing, smooth, along with the increase composite film surface of WMSNC addition is coarse gradually.
5, after composite membrane adds WMSNC, composite membrane surface of fracture knot forms perpendicular threadiness.
Accompanying drawing explanation
Fig. 1 is the SEM figure of WMSNC;
Fig. 2 is that the addition of WMSNC is on the impact of the transmittance of PS film;
The surperficial SEM collection of illustrative plates of Fig. 3 PS and WMSNC composite membrane, it is 0,1%, 3%, 5%, 7 and 9% that figure A, B, C, D, E and F represent WMSNC respectively at the addition of PS film;
The surface of fracture SEM collection of illustrative plates of Fig. 4 PS and WMSNC composite membrane, it is 0,1%, 3%, 5%, 7 and 9% that figure A, B, C, D, E, F represent WMSNC respectively at the addition of PS film.
Embodiment
Embodiment 1
5g pea starch and 2.5g glycerine are placed in the beaker mixing and stirring filling 100g distilled water, after boiling water bath stirring heating 45min, are cooled to 50 DEG C; Taking 0.05gWMSNC is dissolved in 50ml distilled water, and the WMSNC aqueous solution prepared mixes with the pea starch of preparation and the mixed aqueous solution of glycerine by ultrasonic disperse 3 minutes, 50ml distilled water is added the 100g aqueous solution and does blank.To pour in filter flask after the sample magnetic force mix and blend 30min mixed, be the degassed 10min of vacuum pump of 1.0MPa by vacuum tightness.Get a certain amount of film liquid evenly to tile with on the plane ware (diameter 15 centimetres) of clean dried, the thermostatic drying chamber being placed in 40 DEG C is dry; Film formed after drying is taken off, is placed on room temperature preservation in the moisture eliminator being equipped with saturated aqueous common salt for subsequent use.
Embodiment 2
5g pea starch and 2.5g glycerine are placed in the beaker mixing and stirring filling 100g distilled water, after boiling water bath stirring heating 40min, are cooled to 45 DEG C.Taking 0.15gWMSNC is dissolved in 50ml distilled water, and the WMSNC aqueous solution prepared mixes with the pea starch of preparation and the mixed aqueous solution of glycerine by ultrasonic disperse 2.5 minutes, and 50ml distilled water adds the 100g aqueous solution and does blank.To pour in filter flask after the sample magnetic force mix and blend 25min mixed, be the degassed 6min of vacuum pump of 1.0MPa by vacuum tightness.Get a certain amount of film liquid evenly to tile with on the plane ware (diameter 15 centimetres) of clean dried, the thermostatic drying chamber being placed in 35 DEG C is dry; Film formed after drying is taken off, is placed on room temperature preservation in the moisture eliminator being equipped with saturated aqueous common salt for subsequent use.
Embodiment 3
5g pea starch and 2.5g glycerine are placed in the beaker mixing and stirring filling 100g distilled water, after boiling water bath stirring heating 50min, are cooled to 55 DEG C.Taking 0.25gWMSNC is respectively dissolved in 50ml distilled water, and then the WMSNC aqueous solution prepared mix with the pea starch of preparation and the mixed aqueous solution of glycerine by ultrasonic disperse 3.5 minutes, and 50ml distilled water adds the 100g aqueous solution and does blank.To pour in filter flask after the sample magnetic force mix and blend 35min mixed, be the degassed 15min of vacuum pump of 1.0MPa by vacuum tightness.Get a certain amount of film liquid evenly to tile with on the plane ware (diameter 15 centimetres) of clean dried, the thermostatic drying chamber being placed in 40 DEG C is dry; Film formed after drying is taken off, is placed on room temperature preservation in the moisture eliminator being equipped with saturated aqueous common salt for subsequent use.
Embodiment 4
5g pea starch and 2.5g glycerine are placed in the beaker mixing and stirring filling 100g distilled water, after boiling water bath stirring heating 45min, are cooled to 50 DEG C.Taking 0.35g WMSNC is dissolved in 50ml distilled water, and then the WMSNC aqueous solution prepared mix with the pea starch of preparation and the mixed aqueous solution of glycerine by ultrasonic disperse 3 minutes, and 50ml distilled water adds the 100g aqueous solution and does blank.To pour in filter flask after the sample magnetic force mix and blend 30min mixed, be the degassed 10min of vacuum pump of 1.0MPa by vacuum tightness.Get a certain amount of film liquid evenly to tile with on the plane ware (diameter 15 centimetres) of clean dried, the thermostatic drying chamber being placed in 40 DEG C is dry; Film formed after drying is taken off, is placed on room temperature preservation in the moisture eliminator being equipped with saturated aqueous common salt for subsequent use.
Embodiment 5
5g pea starch and 2.5g glycerine are placed in the beaker mixing and stirring filling 100g distilled water, after boiling water bath stirring heating 45min, are cooled to 50 DEG C.Taking 0.45gWMSNC is respectively dissolved in 50ml distilled water, and then the WMSNC aqueous solution prepared mix with the pea starch of preparation and the mixed aqueous solution of glycerine by ultrasonic disperse 3 minutes, and 50ml distilled water adds the 100g aqueous solution and does blank.To pour in filter flask after the sample magnetic force mix and blend 30min mixed, be the degassed about 10min of vacuum pump of 1.0MPa by vacuum tightness.Get a certain amount of film liquid evenly to tile with on the plane ware (diameter 15 centimetres) of clean dried, the thermostatic drying chamber being placed in 40 DEG C is dry; Film formed after drying is taken off, is placed on room temperature preservation in the moisture eliminator being equipped with saturated aqueous common salt for subsequent use.
The Performance Detection of prepared composite membrane:
1, detection method and material
(1) thickness measurement of composite membrane
The thickness of film uses spiral micrometer (0-25mm) to measure.On tested film, get 10 mensuration at random, average.
(2) mensuration of composite membrane absorbancy
Film is cut into 1cm × 4cm size, be attached to the side of cuvette (1cm), under 600nm, measure its absorbancy with ultraviolet-visible spectrophotometer, do blank with empty ware.Often organize sample and get 3 pieces of films, average.
(3) composite membrane color measuring
With colourimeter analytic sample surface color, sample (50 × 50mm) is placed on a white on-gauge plate, its (L*a*b*) is measured.The L*a*b* value of on-gauge plate is L*=96.68, a*=0.14, and b*=1.94.Each sample, measures 5 different positions, averages.
(4) mensuration of composite membrane solubleness
(W0) is weighed after film being placed in the dry 12h of electric heating constant-temperature blowing drying box of 105 DEG C, and then put into beaker and add the submergence of 40mL distilled water, abundant stirring and dissolving 24h, then from beaker, film is taken out, use distilled water rinsed clean lightly, weigh dry 12h in the thermostatic drying chamber of 105 DEG C after (W1).The percentage ratio that before and after being dissolved by film, weight reduces represents film water dissolubility size.Each sample does 3 and parallelly to average.Calculation formula is as follows:
S％＝[(W
0—W
1)/W
0]×100
In formula: S-solubleness;
W
0-film first time dried weight (g);
W
1dried weight (g) again after one film dissolves.
(5) mensuration of composite membrane mechanical property
Get l block sanction and grow into about 10.00cm, wide is the peanut protein isolate film of 1.00cm, tested film is got 10 points at random, averages with the measurement of spiral micrometer, 0.001mm is accurate to, as the one-tenth-value thickness 1/10 in this sample extension intensity and elongation at break formula during reading.First film is balanced 48h under the relative humidity of 50% before mensuration, carry out Elongation test with TA-XT type property tester, Operation system setting initially presss from both sides apart from being set to 20mm, and the translational speed of probe is set to 100mm and min.Read pulling force when film ruptures and length.Often organize sample measurement to average for 3 times.Tensile strength represents with TS (MPa), calculates and presses following formula:
TS=P and (b*d)
In formula: P-maximum load (N);
B-specimen width (mm);
D-sample thickness (mm).
Elongation at break represents with E (%), is calculated as follows:
E (%)=100 (L-L
0) and L
0
In formula: L
0the original distance between bench marks of-sample is from (mm);
During L-sample fracture, distance distance between bench marks is from (mm).
(6) mensuration of composite membrane water preventing ability
Often kind of sample film is cut into the diaphragm being of a size of 3.5cm × 3.5cm, gets four summits and the measurement of central point spiral micrometer, average, during reading, be accurate to 0.001mm, as the one-tenth-value thickness 1/10 in this sample water vapor permeation coefficient formula.Before test, film is at 25 DEG C, and relative humidity is put 48 hours in the moisture eliminator of 67% (saturated sodium chloride solution).
Adopt and intend cup method, under 25 DEG C of temperature condition, diaphragm closely covers test rim of a cup, and is sealed by melt paraffin.With Calcium Chloride Powder Anhydrous pre-fill test glass, cup top reserves 3 millimeters, and weighs.Glass cylinder after weighing is put into moisture eliminator, then bottom moisture eliminator, puts the small beaker that fills saturated NaCl solution, the relative humidity of 60% is provided.For guaranteeing that solution is in state of saturation always, should have a small amount of not molten NaCl solid in small beaker, at room temperature balance for some time, every 24h surveys the weight of a weighing bottle, tends towards stability to weighing bottle changes in weight.Calculate water vapour vapor transfer rate (WVTR) and water vapour transmission coefficient (WVP) value, each sample do 3 parallel.
Calculation formula is as follows:
WVTR=
△m and (A*
△t); WVP=(
△and (A* m*d)
△t*
△p)
In formula: WVTR-steam permeating rate (g and m
2s);
WVP-water vapour transmission coefficient (gm and m
2sPa);
△the increment (g) of m-stabilised quality;
The area (m2) of A-film;
Δt-minute interval (s);
The thickness (m) of d-film;
△the water vapor pressure reduction (Pa) of p-sample both sides.
(7) scanning electron microscope (SEM) observation
Surface and the cross section of film is observed respectively by scanning electron microscope (ABT-150, Tuo Bang company, Japan).When measuring surface tissue, the injected one deck gold in film surface, charges to avoid electron beam.When measuring cross-sectional structure, film is freezing by liquid nitrogen, then ruptures immediately, metal spraying observing.
(8) data analysis
All data all do three groups of parallel tests, then average and obtain.With statistical variance analytical method processing data (P < 0.05).
(9) experiment material
Pea starch National Starch (Shanghai) Chemical Co., Ltd.
Waxy corn starch National Starch (Shanghai) Chemical Co., Ltd.
Other reagent are analytical pure
(10) laboratory apparatus
2, experimental result:
(1) the scanning electron microscope collection of illustrative plates of WMSNC
As shown in Figure 1, after acidolysis process, the nanocrystalline particle size of single waxy corn starch is about 100nm, but due to the effect of surface hydroxyl, more serious clustering phenomena appears in nanometer starch crystal.
(2) transmittance of PS and WMSNC composite membrane
Transmittance is one of index sense organ being weighed membrane property quality, is also the supplementary means judging that blended substrate compatibility is good Yu bad simultaneously.PS and the WMSNC nano composite membrane that the present invention makes is transparent, and transmittance as shown in Figure 2.The transmittance of pure PS film is 86.7%, and along with the increase of the addition of WMSNC, the transmittance of nano composite membrane reduces gradually, and when addition is 9%, the transmittance of nano composite membrane is down to 64.2%.This may be because nanometer starch crystal is the film material strongthener that a kind of degree of crystallinity is high, its crystal grain form is not of uniform size, and when WMSNC addition increases, meeting skewness in matrix, easily cause refraction and the reflection of light, thus the transparence of nano composite membrane is reduced.Duan Bin finds in the preparation of starch nano crystal grain and natural polymer laminated film and performance study thereof, and along with the increase of the nanocrystalline addition of waxy corn starch, the transmittance of cm-chitosan and waxy corn starch nanocomposite film reduces.
(3) mechanical property of PS and WMSNC composite membrane
As can be seen from Table 1, along with the increase of the nanocrystalline addition of waxy corn starch, the tensile strength (TS) of composite membrane and Young's modulus (M) first increase and reduce afterwards.But elongation at break (E) first reduces to increase afterwards.When nanometer starch crystal addition is 5%, it is 9.96MPa that the tensile strength of composite membrane reaches maximum value, and now maximum increase per-cent is 72.9%, and the elongation at break of composite membrane is reduced to minimum value is 12.58%.This may be because nanometer starch crystal has the features such as compact structure, rigidity are large, and adding in pea starch film can the tensile strength of remarkable reinforcing membrane, but reduces the ductility of film simultaneously.When the addition (7%-9%) of nanometer starch crystal continues to increase, the tensile strength of composite membrane reduces, and elongation at break increases.This may be because nanometer starch crystal surface exists great amount of hydroxy group, and intermolecularly to assemble when nanometer starch crystal addition increases, skewness in composite membrane matrix, causes the microphase-separated that composite membrane is certain, therefore the mechanical property of composite membrane is affected.
The mechanical property of table 4-2PS and WMSNC composite membrane
Note: TS: tensile strength; It is 0,1%, 3%, 5%, 7 and 9% that sample A, B, C, D, E and F represent WMSNC respectively at the addition of PS film; Same column letter is different, represents significant difference (P<0.05).
(4) barrier property of PS and WMSNC composite membrane
As can be seen from Table 2, the nanocrystalline interpolation of waxy corn starch makes the moisture content of composite membrane, and coefficient of permeability and permeation rate significantly reduce.When nanometer starch crystal addition is 5%, the moisture content of film, coefficient of permeability and permeation rate all reach minimum, and the block-water performance of film significantly improves.This may be because nanometer starch crystal shows the hydroxyl of existence and the hydroxyl generation intermolecular cross-linking contained by pea starch, composite membrane is made to form more fine and close network structure by intermolecular interaction, change water diffusion permeation pathway, hinder migration and the infiltration of moisture.
The barrier property of table 4-3PS and WMSNC composite membrane
Note: PS: pea starch; WMSNC: waxy corn starch is nanocrystalline; Moisture: moisture content; WVP: coefficient of permeability; WVTR: permeation rate; It is 0,1%, 3%, 5%, 7 and 9% that sample A, B, C, D, E and F represent WMSNC respectively at the addition of PS film; Same column letter is different, represents significant difference (P<0.05).
(5) the surperficial SEM image of PS and WMSNC composite membrane
Can see from Fig. 3 A, pure pea starch is complete through the gelatinization of 45min boiling water bath, film surfacing, smooth, along with the increase composite film surface of nanometer starch crystal addition is coarse gradually.When the nanometer starch crystal added is at 1%-5%, nanometer starch crystal can comparatively be dispersed in system, and can see that nanocrystalline is that particulate state is distributed in membrane matrix.And nanocrystallinely when addition is 7% (Fig. 3 E) start to occur clustering phenomena in composite membrane matrix.In addition, when nanometer starch crystal addition is 3%, composite film surface starts to occur wire; When nanocrystalline addition is 7%, film surface wire is more intensive; When addition is 9%, there is slight crack in composite film surface.And when nanocrystalline addition is 5%, composite film surface is more smooth and smooth, without obvious nanocrystalline clustering phenomena, composite film surface is without obvious wire and slight crack.This may be because the nanometer starch crystal of interpolation 5% and membrane matrix can reach optimal compound proportion, therefore presents preferably composite membrane character, and the mechanical property that this demonstrates the composite membrane when nanocrystalline addition is 5% is relative with barrier property better.
(6) the section SEM image of PS and WMSNC composite membrane
As shown in Figure 4, pure pea starch film surface of fracture structure is in the horizontal stripes shape risen and fallen; After adding WMSNC, composite membrane surface of fracture knot forms perpendicular threadiness.When nanocrystalline addition is 1%, it is the most obvious that composite membrane erects filamentary structure; When addition is 7%, structure of composite membrane starts to occur gap and slight crack; Continue to add WMSNC, composite membrane surface of fracture slight crack increases, in fault structure.And when addition is 5%, composite membrane surface of fracture compact structure, without clear gap and slight crack.This may be because when WMSNC addition is 5%, the hydroxyl of nanocrystal surface hydroxyl and pea starch molecule better suited Interpolymer Association effect occurs, the network structure that gel formation is more fine and close, therefore the over-all properties of composite membrane also reaches best at this addition.When addition continues to increase, structure of composite membrane is made to occur gap and slight crack because clustering phenomena occurs in nanocrystalline intramolecular interaction.
By the WMSNC of research Different adding amount (1%, 3%, 5%, 7% and 9%), the impact of PS film properties is found:
1) along with the increase of WMSNC addition, TS and M of composite membrane increases, and E reduces, and when WMSNC addition is 5%, the TS of composite membrane reaches maximum, and E is reduced to minimum.When the addition of WMSNC continues to increase (7%-9%), the TS of composite membrane reduces, and E increases.
2) interpolation of WMSNC makes the moisture content of composite membrane, and coefficient of permeability and permeation rate significantly reduce.When WMSNC addition is 5%, the moisture content of film, coefficient of permeability and permeation rate all reach minimum, and the block-water performance of film significantly improves.But when WMSNC addition is more than 5% (7%-9%), there is the trend of dying down in the block-water performance of composite membrane.
3) as can be seen from the SEM figure on nano composite membrane surface, the surfacing of pure PS film, smooth, along with the increase composite film surface of WMSNC addition is coarse gradually.When the WMSNC added is at 1%-5%, WMSNC can comparatively be dispersed in system.When WMSNC addition is 3%, composite film surface starts to occur wire; When WMSNC addition is 7%, film surface wire is more intensive; When addition is 9%, there is slight crack in composite film surface.And when WMSNC addition is 5%, composite film surface is more smooth and smooth, without obvious nanocrystalline clustering phenomena, composite film surface is without obvious wire and slight crack.
4) as can be seen from the SEM figure of composite membrane cross section, pure PS film surface of fracture structure is in the horizontal stripes shape risen and fallen; After adding WMSNC, composite membrane surface of fracture knot forms perpendicular threadiness.When WMSNC addition is 1%, it is the most obvious that composite membrane erects filamentary structure; When addition is 7%, structure of composite membrane starts to occur gap and slight crack; Continue to add WMSNC, composite membrane surface of fracture slight crack increases, in fault structure.And when WMSNC addition is 5%, composite membrane surface of fracture compact structure, without clear gap and slight crack.Therefore the over-all properties of composite membrane also reaches best at this addition.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (9)
1. a preparation method for pea starch and waxy corn starch nanocomposite film, is characterized in that, comprises the following steps:
(1) will be the pea starch of 0.047% containing massfraction, massfraction be the aqueous solution of the glycerine of 0.023%, after boiling water bath stirring heating 40-50min, be cooled to 45-55 DEG C;
(2) in step (1) gained solution, add WMSNC, the add-on of described WMSNC is the 1%-9% of PS contents on dry basis;
(3) by pouring in filter flask after step (2) gained solution magnetic force mix and blend 25-35min, being the degassed 6-15min of vacuum pump of 1.0MPa by vacuum tightness, obtaining composite membrane liquid;
(4) get above-mentioned composite membrane liquid to be laid on plane ware, the thermostatic drying chamber being placed in 35-45 DEG C is drying to obtain composite membrane.
2. the preparation method of composite membrane as claimed in claim 1, is characterized in that, through boiling water bath stirring heating 45min in described step (1).
3. the preparation method of composite membrane as claimed in claim 1, it is characterized in that, described step is cooled to 50 DEG C in (1).
4. the preparation method of composite membrane as claimed in claim 1, is characterized in that, pour in filter flask after described step (3) mix and blend 30min.
5. the preparation method of composite membrane as claimed in claim 1, is characterized in that, the degassed 10min of described step (3) vacuum pump.
6. the preparation method of composite membrane as claimed in claim 1, is characterized in that, the thermostatic drying chamber that described step (4) is placed in 40 DEG C is drying to obtain composite membrane.
7. the preparation method of composite membrane as claimed in claim 1, is characterized in that, the nanocrystalline preparation method of described waxy corn starch is as follows:
Waxy corn starch is dissolved in the H of 3.16M
2sO
4in solution, the concentration of described waxy corn starch is 146.9g and L, in 35-45 DEG C of stirring in water bath 5 days, centrifuge washing was to neutral repeatedly continuously for the suspension distilled water that then will obtain, then it is nanocrystalline namely neutral solution to be obtained in vacuum freeze drier waxy corn starch after freeze-drying.
8. the preparation method of composite membrane as claimed in claim 7, is characterized in that, in 40 DEG C of stirring in water bath 5 days.
9. the composite membrane that the preparation method of the composite membrane as described in claim 1-8 obtains.
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| CN105273210A (en) * | 2015-03-02 | 2016-01-27 | 北京工商大学 | High-barrier composite film and preparation method therefor |
| CN108384211A (en) * | 2018-04-10 | 2018-08-10 | 佛山市熙华科技有限公司 | A kind of preparation method of environmental-protection ventilation laminated film |
| CN113493572A (en) * | 2021-07-22 | 2021-10-12 | 上海乐亿塑料制品有限公司 | Degradable environment-friendly plastic film, and preparation method and application thereof |
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