CN103740117B - A kind of stable mechanical performance type eats composite membrane and preparation method thereof - Google Patents
A kind of stable mechanical performance type eats composite membrane and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of stable mechanical performance type and eat composite membrane and preparation method thereof, soybean protein isolate and gelatin are under the participation of Kappa-Carraginan is assisted, the internal structure of soybean protein isolate and glutin has been transformed through vapor crosslinking process under unique reaction conditions, select specific each amounts of components further simultaneously, certain plasticizers composition and proportioning, albumen is formed more fine and close, uniform 3 D stereo reticulated structure, effectively improve the stability of mould material, within 3 months storage periods, mechanical property rangeability is less, tensile strength only reduces 5-12%, composite membrane water-permeable only increases 5-8%, composite membrane oxygen-permeable only increases 3-5.5%, the saturating carbonic acid gas of composite membrane only increases 2-4.5%, and transparent color and luster is unaffected, extend effective period of food quality, the present invention has simple to operate, and quality of item is reliable and stable, is suitable for suitability for industrialized production.
Description
Technical field
The invention provides a kind of stable mechanical performance type and eat composite membrane and preparation method thereof, more specifically to soybean protein isolate/gelatin/Kappa-Carraginan composite package film and preparation method thereof, belong to Food Packaging technology field.
Background technology
The quality guaranteed period of food depends on food product pack and obstruct to external world thereof.Plastic film Application comparison is general, but is easy to produce obnoxious flavour and peculiar smell, and not easily decomposes, and causes " white pollution ".Edible film because of its distinctive barrier, security and the advantage such as pollution-free, and enjoys the extensive concern of food service industry and packaging industry.But see based on existing domestic and international edible film progress, edible film mechanical stability within storage period is poor, and in storage period, mechanical property alters a great deal, be cause edible film temporarily can't the principal element in widespread use market.
At present, domesticly focus mostly at present on mechanical property improves about the research of edible soybean protein composite membrane, such as, patent CN 103146004A by introducing photosensitive polymers PVA-SbQ in SPI, carry out UV radiation modification process and prepare soybean protein film, improve composite membrane water tolerance; Patent CN 101199314A for main raw material, adopts glutamine transaminage to carry out modification with soybean protein and wheat-gluten, improves tensile strength and the unit elongation of composite membrane; Patent CN 102190805A adopts the structure of supersound process soybean transformation albumen, improves the edible film tensile strength that soybean protein is matrix, increases composite membrane transmittance, enhances barrier to oily matter; Also be no lack of and utilize reactive behavior is high, reaction is fast, high to resultant, cross-linking properties good, penetrativity is strong glutaraldehyde steam treatment soybean protein and prepare composite membrane, but, above-mentioned various research ignores while research improves mechanical property, how to improve the research of mechanical stability.Therefore, how when ensuring the quality of products, by the process of soybean protein isolate molecular modification, regulate preparation gordian technique, improve edible soybean protein composite membrane mechanical property, improving SNR stability, just becomes one of current food service industry and food packaging industry problem demanding prompt solution.
Also not yet there is the report using specific method soybean protein isolate, gelatin, Kappa-Carraginan three together to be obtained to the edible soybean protein composite membrane of stable mechanical performance type by the modification of glutaraldehyde vapor crosslinking at present, especially do not use certain plasticizers, namely specific composition and proportioning work in coordination with the consumable film obtaining stable mechanical performance further.On this basis, also not to the report of vapor crosslinking mechanism, crosslinked environment.
Summary of the invention
Object of the present invention: for above-mentioned existing Problems existing and deficiency, the invention provides a kind ofly have that technique is simple, easy handling, cycle are short, eat composite membrane preparation method without the need to complex apparatus, the high-mechanical property stable form that significantly improves the advantages such as product performance.Soy protein isolate utilization ways can be widened, improve value-added content of product.
The technical problem that the present invention solves: the edibility protein film mechanical stability when storage, wrap food solved at present both at home and abroad prepared by food product pack research field is poor, finally cause the wrap food quality guaranteed period significantly to decline, restriction edible film is applied to the common problem of food service industry, packaging industry.
The technical scheme that the present invention solves: a kind of stable mechanical performance type eats the preparation method of composite membrane, it is characterized in that preparing according to following steps:
(1) in beaker, add 100g temperature is 40 ~ 60 DEG C of distilled water, with distilled water weight percent meter, add 5 ~ 7% gelatin and 1 ~ 3%k-carrageenin, add again after two kinds of glue water absorption and swellings 4 ~ 8% dehydrated alcohols, 1.0 ~ 3.0% softening agent, 0.05 ~ 0.15% sodium sulphite anhydrous 99.3, add 2 ~ 4% soybean protein isolates under the state of magnetic agitation, obtain mixing solutions;
(2) solution ph is adjusted to 8.0, after magnetic stirrer 45-50s, 90-95 DEG C of heating in water bath 20-25min, adopts ultrasonic wave to carry out the degassed process of froth breaking, ultrasound condition: 100-150 hertz, time 20 min, in the acrylic board slot that the solution after degassed is poured into;
(3) glutaraldehyde liquid is put into temperature automatically controlled pressure control and airtight steam crosslinking device, the reaction of glutaraldehyde vapor crosslinking is carried out in airtight steam crosslinking device, concrete reaction conditions: steam crosslinking device inner pressure constant is to 101KPa, first in high temperature, short time condition, namely temperature is react 20 ~ 30min under 40 ~ 50 DEG C of conditions, and the inner glutaraldehyde vapour concentration of device controls at 20-25ppm; Condition when modulation low temperature is long subsequently, namely temperature is react 1 ~ 2h under 25 ~ 30 DEG C of conditions, and the inner glutaraldehyde vapour concentration of device controls at 10-15ppm;
(4) after vapor crosslinking, will fill acrylic board 50 DEG C of forced air drying 15h of film-forming soln, after dry, room temperature places 6-7h, and bath temperature is take off film after 87 DEG C of 45s that ease back;
(5) finished product.
The mixture that softening agent described in preferred steps (1) is both glycerine and polyoxyethylene glycol, the two mass ratio is 2:3; Or the softening agent described in preferred steps (1) is the mixture of glycerine, polyoxyethylene glycol and polyvinyl alcohol three, three's mass ratio is 2:3:1.
The board slot specification of preferred steps (2) acrylic board is length × wide × high 300 × 300 × 10mm, and pour mask amount is 100g.
Edible composite membrane prepared by aforesaid method is provided simultaneously, there is following characteristics:
(1) 3 months storage periods, reserve temperature 25 DEG C, humidity 50%, described edible composite membrane tensile strength only reduces 5-12%, and only the tensile strength of soybean protein isolate and the composite membrane of gelatin after glutaraldehyde solution crosslinking Treatment reduces 20-30%; And
(2) within 3 months storage periods, composite membrane water-permeable increases 5-8%, and only the water-permeable of soybean protein isolate and the composite membrane of gelatin after glutaraldehyde solution crosslinking Treatment increases 15-20%; And
(3) within 3 months storage periods, composite membrane oxygen-permeable increases 3-5.5%, and only the oxygen-permeable of soybean protein isolate and the composite membrane of gelatin after glutaraldehyde solution crosslinking Treatment increases 8-13.6%; And
(4) within 3 months storage periods, the saturating carbonic acid gas of composite membrane increases 2-4.5%, and only the saturating carbonic acid gas of soybean protein isolate and the composite membrane of gelatin after glutaraldehyde solution crosslinking Treatment increases 7-9.3%.
Wherein, the assessment method of mechanical stability is:
In formula: H
0---temperature is
25dEG C, humidity is the tensile strength of 50% ambient storage composite membrane after 2 days or water-permeable or oxygen-permeable or carbonic acid gas thoroughly; H
t---temperature is
25dEG C, humidity is the tensile strength of 50% ambient storage after 3 months or water-permeable or oxygen-permeable or carbonic acid gas thoroughly, 4 index comprehensives evaluation mechanical stability
The edible soybean protein composite membrane that the present invention obtains can be directly water-soluble; Can be applicable to food packing inside bag, be specially adapted to packaging of meat products field, the application namely in meat product packing inside bag, this product improves the quality of edible packing membrane on the one hand, extends the wrap food quality guaranteed period.This composite membrane has the total advantage of two kinds of albumen on the other hand, in the presence of Kappa-Carraginan, make two kinds of albumen have better biocompatibility, the necessary amino acid of human body can be supplemented simultaneously, improve food value, thus reach the object of " Green Packaging ".
Be that 50% ambient storage carries out For Measuring Mechanical Properties (with soybean protein isolate and gelatin without the composite membrane of glutaraldehyde vapor crosslinking process for contrast) after 3 months by obtained edible soy protein composite membrane in temperature 25 DEG C, humidity:
(1) tensile strength (TS) measures
TA-XTplus2 Texture instrument (TA.XT.Plus, SMS company of Britain) is adopted to analyze soybean protein isolate edible film performance (physical strength).To treat that test sample makes the rectangular of length × wide 150 × 20mm, film thickness is 0.06mm.Stretching strength determination adopts A/SPR bending probe.Arranging the minimum perception of probe is 5g, and before stretching, probe travelling speed is 5.0mm/s, and the travelling speed in drawing process is 5.0 mm/ s, and the travelling speed after stretching in return course is 5.0 mm/s, and effective stretching distance is 50mm.The maximum induction force F(unit g that namely edible film physical strength pops one's head in drawing process by tensile strength (Tensile strength)) represent.Each sample repeats 3 times, averages.
(2) steam breathability measures:
Adopt and intend cup method and measure water vapour permeability: take the Calcium Chloride Powder Anhydrous of 3g drying and to load diameter be in the weighing bottle of 20mm, with paraffin, soybean protein composite membrane to be measured is sealed in bottle mouth position, be placed in the moisture eliminator (in-built Potassium Bromide saturated solution) that relative humidity is 83%, weigh afterwards in 1 day (24h), calculated the transmitance of water vapor by the increasing amount that cup is heavy.
WVTR water vapour permeability (mg/cm
2d); Dm water vapor migration amount (mg); Area (the cm of A film
2); T minute (d);
(3) oxygen-permeable measures:
At the bottled 3mL linolic acid of weighing, other process is with steam breathability measuring method.
(4) carbonic acid gas measures thoroughly:
At the bottled 3mLKOH saturated solution of weighing, other process is with steam breathability measuring method.
(5) calculating of mechanical stability:
In formula: H
0---temperature is
25dEG C, humidity is the tensile strength of 50% ambient storage composite membrane after 2 days or water-permeable or oxygen-permeable or carbonic acid gas thoroughly; H
t---temperature is
25dEG C, humidity is the tensile strength of 50% ambient storage after 3 months or water-permeable or oxygen-permeable or carbonic acid gas thoroughly.
Tensile strength, water-permeable, oxygen-permeable, the thoroughly measuring method of carbonic acid gas also can adopt other ordinary method of this area to measure.
(6) soybean protein composite film surface microstructure observing
Slide glass is dipped vertically in the polymeric protein liquid of preparation, vertically take out after 3 min, be placed in Bechtop to dry and be placed on atomic force microscope (AFM) scan table, sample area to be scanned is located with watch-dog, in function software, tapping-mode (Tapping Mode) is selected to scan, optimum configurations: adopt silicon nitride (Si
3n
4) cantilever, long 85 μm of micro-cantilever, cantilever force constant 2.5 Nm
-1; SNL-10 type needle point, probe tip radius-of-curvature is 20-30 nm.Test determination temperature remains on 22 ± 1 DEG C, and ambient relative humidity remains to more than 50%.Observe the surface finish difference of each histone liquid, and utilize afm image analytical system to carry out quantitative measurment to the maximum peak height of scanning samples and mean roughness.
Beneficial effect of the present invention:
(1) gelatin, soybean protein isolate and 1 ~ 3%k-carrageenin use glutaraldehyde steam to carry out crosslinking Treatment by the invention; Select specific amounts of components further and use specific softening agent, obtained stable mechanical performance type eats composite membrane being compared with contrast with soybean protein isolate, gelatin without the composite membrane of glutaraldehyde vapor crosslinking process in 3 months storage periods, the composite membrane mechanical stability of vapor crosslinking modification is better, storage period be in 3 months tensile strength reduce 5-12%, water-permeable increases 5-8%, oxygen-permeable increases 3-5.5%, and saturating carbonic acid gas increases 2-4.5%.Protein polymer configuration of surface is more smooth, fine and close, smooth.Mechanical stability is more lasting, increases substantially product quality; Product presents faint yellow, free from beany flavor and peculiar smell, inclusion-free; Exterior quality is better.
(2) soybean protein isolate and glutin have good consistency, in thermal treatment denaturation process, protein molecular is fully unfolded, the hydraulic radius of self strengthens, glycinin is filled between gelatin linear molecule chain, now, Kappa-Carraginan plays synergy, be adsorbed on soybean protein and glutin molecule, Kappa-Carraginan is strengthened with the effect of two kinds of albumen, mutual entanglement, form the space gel structure of co-continuous, generate complex coacervation body, glutaraldehyde vapor crosslinking is adopted to carry out modification to soybean protein and glutin further, free amine group on soybean protein isolate and glutin molecule and glutaraldehyde aldehyde radical generation condensation reaction, generate condensation product Schiff, change intermolecular interaction and spacial framework and improve mechanical property.
Amino generation mechanism of crosslinking in glutaraldehyde in aldehyde radical and soybean protein isolate, glutin:
Free amine group on soybean protein isolate and glutin molecule and glutaraldehyde generation condensation reaction, generate condensation product Schiff.Reactive behavior is high, reaction is fast, high to resultant, cross-linking properties good, reactive force between molecular chain is strengthened, define dot density more greatly, meticulousr protein molecular cross-linked three D tridimensional network, significantly improve the stable mechanical performance of composite membrane in duration of storage.
Meanwhile, the invention moulding dose of using both glycerine and polyoxyethylene glycol to form, the two mass ratio is 2:3; The softening agent that further selection glycerine, polyoxyethylene glycol and polyvinyl alcohol three form, three's mass ratio is 2:3:1; Obtain unforeseeable technique effect.Softening agent glycerine negative ion and polyoxyethylene glycol negative ion have strong interaction force with between glutaraldehyde positive ion, when the process of glutaraldehyde vapor crosslinking, 1 of glycerine, 3 carbon atoms and polyoxyethylene glycol carbon atom lose hydrogen atom simultaneously and form the carbanion with four reactivity worth, by the transfer of electron pair, on two kinds of softening agent carbon, negative charge can transfer to enol negative ion Sauerstoffatom being formed conjugated double bond structures, hydrogen and hydroxyl remove with four molecular water forms, the water molecules removed is connected with albumen with the form of hydrogen bond, and then enol negative ion carries out nucleophilic addition(Adn) with the carbonyl of another glutaraldehyde, form carbon-carbon single bond, obtain reticulated structure chirality dendroid polymerisate macromole more closely, enhance the interaction force between molecule, add the rigidity of albumen, the effect of softening agent simultaneously changes the kindliness between protein molecular, enhancing is outlet capacity, reduce composite membrane fragility, further preferably polyethylene alcohol is assisted.Therefore, the composite membrane of this invention preparation is compared with the composite membrane prepared without this kind of method, has higher mechanical stability, and better thermotolerance, oil resistant, water tolerance, barrier.
(3) the present invention adopts unique reactive mode and condition, high temperature, in short-term with low temperature, long time great-jump-forward temperature automatically controlled control wet in crosslinking apparatus and react, steam crosslinking device inner pressure constant is to 101KPa, first in high temperature, short time condition, namely temperature is react 20 ~ 30min under 40 ~ 50 DEG C of conditions, and the inner glutaraldehyde vapour concentration of device controls at 20-25ppm; Condition when modulation low temperature is long subsequently, namely temperature is react 1 ~ 2h under 25 ~ 30 DEG C of conditions, the inner glutaraldehyde vapour concentration of device controls at 10-15ppm processing machinery stable performance type soybean protein composite membrane, improve tensile strength, water-permeable, oxygen-permeable, thoroughly carbonic acid gas, improve mechanical stability.Glutaraldehyde vapor crosslinking reaction temperature influence is very large, at relatively high temperatures, glutaraldehyde steam can make the system generation condensation reaction of soybean protein, glutin, Kappa-Carraginan fast and fully, but the high temperature continued can cause reaction violent, make in film forming liquid, to occur the insoluble cross-linked polymer of part, the composite film surface formed is coarse, light transmission is poor, reduces composite membrane mechanical property on the contrary.Based on principle and the various influence factor of the reaction of glutaraldehyde vapor crosslinking, on the basis of early-stage Study, the condition that contriver creatively first selects high temperature, short time relatively violent, make glutaraldehyde rapid vaporization, the glutaraldehyde steam of high density is reacted rapidly within a certain period of time and forms some amount mixture, condition relatively gentle when selecting low temperature long afterwards, make glutaraldehyde partial liquefaction, form Low Concentration Glutaraldehyde steam, reactant is fully reacted further with film forming liquid within a certain period of time, to form the cross-linked network of solid exquisiteness, the unexpected beneficial effect that the method obtains.
Embodiment
embodiment 1a kind of stable mechanical performance type eats the preparation method of composite membrane
(1) in beaker, add 100g temperature is 40 ~ 60 DEG C of distilled water, with distilled water weight percent meter, add 5% gelatin and 1%k-carrageenin, add again after two kinds of glue water absorption and swellings 4 ~ 8% dehydrated alcohols, 1.0% softening agent, 0.05 ~ 0.15% sodium sulphite anhydrous 99.3, add 2% soybean protein isolate under the state of magnetic agitation, obtain mixing solutions;
(2) solution ph is adjusted to 8.0, after magnetic stirrer 45-50s, 90-95 DEG C of heating in water bath 20-25min, adopts ultrasonic wave to carry out the degassed process of froth breaking, ultrasound condition: 100-150 hertz, time 20 min, in the acrylic board slot that the solution after degassed is poured into;
(3) glutaraldehyde liquid is put into temperature automatically controlled pressure control and airtight steam crosslinking device, the reaction of glutaraldehyde vapor crosslinking is carried out in airtight steam crosslinking device, concrete reaction conditions: steam crosslinking device inner pressure constant is to 101KPa, first in high temperature, short time condition, namely temperature is react 20min under 40 DEG C of conditions, and the inner glutaraldehyde vapour concentration of device controls at 20ppm; Condition when modulation low temperature is long subsequently, namely temperature is react 1h under 25 DEG C of conditions, and the inner glutaraldehyde vapour concentration of device controls at 10ppm;
(4) after vapor crosslinking, will fill acrylic board 50 DEG C of forced air drying 15h of film-forming soln, after dry, room temperature places 6-7h, and bath temperature is take off film after 87 DEG C of 45s that ease back;
The mixture that softening agent described in step (1) is both glycerine and polyoxyethylene glycol, the two mass ratio is 2:3.
Be that in 3 months, tensile strength reduces by 10.70% in storage period, water-permeable increases by 7.93%, and oxygen-permeable increases by 5.06%, and saturating carbonic acid gas increases by 4.43%, and the index such as physics and chemistry, microorganism all meets national standard.
embodiment 2
(1) in beaker, add 100g temperature is 40 ~ 60 DEG C of distilled water, with distilled water weight percent meter, add 7% gelatin and 3%k-carrageenin, add again after two kinds of glue water absorption and swellings 4 ~ 8% dehydrated alcohols, 3.0% softening agent, 0.05 ~ 0.15% sodium sulphite anhydrous 99.3, add 3% soybean protein isolate under the state of magnetic agitation, obtain mixing solutions;
(2) solution ph is adjusted to 8.0, after magnetic stirrer 45-50s, 90-95 DEG C of heating in water bath 20-25min, adopts ultrasonic wave to carry out the degassed process of froth breaking, ultrasound condition: 100-150 hertz, time 20 min, in the acrylic board slot that the solution after degassed is poured into;
(3) glutaraldehyde liquid is put into temperature automatically controlled pressure control and airtight steam crosslinking device, the reaction of glutaraldehyde vapor crosslinking is carried out in airtight steam crosslinking device, concrete reaction conditions: steam crosslinking device inner pressure constant is to 101KPa, first in high temperature, short time condition, namely temperature is react 30min under 50 DEG C of conditions, and the inner glutaraldehyde vapour concentration of device controls at 25ppm; Condition when modulation low temperature is long subsequently, namely temperature is react 2h under 30 DEG C of conditions, and the inner glutaraldehyde vapour concentration of device controls at 15ppm;
(4) after vapor crosslinking, will fill acrylic board 50 DEG C of forced air drying 15h of film-forming soln, after dry, room temperature places 6-7h, and bath temperature is take off film after 87 DEG C of 45s that ease back;
(5) finished product.
Softening agent is the mixture of both glycerine and polyoxyethylene glycol, and the two mass ratio is 2:3.
Be that in 3 months, tensile strength reduces by 9.40% in storage period, water-permeable increases by 7.73%, and oxygen-permeable increases by 4.76%, and saturating carbonic acid gas increases by 3.56%, and the index such as physics and chemistry, microorganism all meets national standard.
embodiment 3
(1) in beaker, add 100g temperature is 40 ~ 60 DEG C of distilled water, with distilled water weight percent meter, add 6.5% gelatin and 2%k-carrageenin, 4 ~ 8% dehydrated alcohols, 1.8% softening agent, 0.05 ~ 0.15% sodium sulphite anhydrous 99.3 is added again after two kinds of glue water absorption and swellings, add 4% soybean protein isolate under the state of magnetic agitation, obtain mixing solutions;
(2) solution ph is adjusted to 8.0, after magnetic stirrer 45-50s, 90-95 DEG C of heating in water bath 20-25min, adopts ultrasonic wave to carry out the degassed process of froth breaking, ultrasound condition: 120 hertz, time 20 min, in the acrylic board slot that the solution after degassed is poured into;
(3) glutaraldehyde liquid is put into temperature automatically controlled pressure control and airtight steam crosslinking device, the reaction of glutaraldehyde vapor crosslinking is carried out in airtight steam crosslinking device, concrete reaction conditions: steam crosslinking device inner pressure constant is to 101KPa, first in high temperature, short time condition, namely temperature is react 30min under 48 DEG C of conditions, and the inner glutaraldehyde vapour concentration of device controls at 23ppm; Condition when modulation low temperature is long subsequently, namely temperature is react 2h under 28 DEG C of conditions, and the inner glutaraldehyde vapour concentration of device controls at 14ppm;
(4) after vapor crosslinking, will fill acrylic board 50 DEG C of forced air drying 15h of film-forming soln, after dry, room temperature places 6-7h, and bath temperature is take off film after 87 DEG C of 45s that ease back;
(5) finished product.
Described softening agent is the mixture of glycerine, polyoxyethylene glycol and polyvinyl alcohol three, and three's mass ratio is 2:3:1.
Be that in 3 months, tensile strength reduces by 8.70% in storage period, water-permeable increases by 6.57%, and oxygen-permeable increases by 3.44%, and saturating carbonic acid gas increases by 2.93%, and the index such as physics and chemistry, microorganism all meets national standard.
In embodiment 3 storage period, mechanical property experimental data is as follows:
The soybean protein isolate composite membrane mechanical property of vapor crosslinking modification in table 2 storage period
Note: storage environment humidity is 50%, often three groups of parallel tests have all been carried out in group experiment, and each numerical value is three groups
The mean value of data.
comparative example
(namely use mass percent concentration for 0.4-0.6% glutaraldehyde solution with soybean protein isolate and gelatin without the process of glutaraldehyde vapor crosslinking, glutaraldehyde specification is 80%) composite membrane for contrast, and do not use Kappa-Carraginan, softening agent is conventional glycerine, adopt the reaction times of the temperature of reaction of conventional 50-60 DEG C, 2-3 hour, is other same experimental group; Storage environment temperature is 25 DEG C, humidity is 50%, and For Measuring Mechanical Properties data are as following table:
Without vapor crosslinking modification soybean protein composite membrane mechanical property in table 3 storage period
Note: often three groups of parallel tests have all been carried out in group experiment, and each numerical value is the mean value of three groups of data
Embodiment 3 and comparative example mechanical stability are contrasted, result is as follows:
Table 4 preserves obtained soybean protein composite membrane and blank film mechanical stability synopsis after 3 months
Note: often three groups of parallel tests have all been carried out in group experiment, and each numerical value is the mean value of three groups of data
From embodiment 3, the apparent structure comparison diagram (namely AFM lower surface shape appearance figure contrasts) of glutaraldehyde vapor crosslinking modification and control group protein polymer is middle finds, protein polymer configuration of surface of the present invention is more smooth, fine and close, smooth.
Claims (8)
1. stable mechanical performance type eats a preparation method for composite membrane, it is characterized in that preparing according to following steps:
(1) in beaker, add 100g temperature is 40 ~ 60 DEG C of distilled water, with distilled water weight percent meter, add 5 ~ 7% gelatin and 1 ~ 3%k-carrageenin, add again after two kinds of glue water absorption and swellings 4 ~ 8% dehydrated alcohols, 1.0 ~ 3.0% softening agent, 0.05 ~ 0.15% sodium sulphite anhydrous 99.3, add 2 ~ 4% soybean protein isolates under the state of magnetic agitation, obtain mixing solutions;
(2) solution ph is adjusted to 8.0, after magnetic stirrer 45-50s, 90-95 DEG C of heating in water bath 20-25min, adopts ultrasonic wave to carry out the degassed process of froth breaking, ultrasound condition: 100-150 hertz, time 20 min, in the acrylic board slot that the solution after degassed is poured into;
(3) glutaraldehyde liquid is put into temperature automatically controlled pressure control and airtight steam crosslinking device, the reaction of glutaraldehyde vapor crosslinking is carried out in airtight steam crosslinking device, concrete reaction conditions: steam crosslinking device inner pressure constant is to 101KPa, first in high temperature, short time condition, namely temperature is react 20 ~ 30min under 40 ~ 50 DEG C of conditions, and the inner glutaraldehyde vapour concentration of device controls at 20-25ppm; Be adjusted to subsequently low temperature long time condition, namely temperature is react 1 ~ 2h under 25 ~ 30 DEG C of conditions, and the inner glutaraldehyde vapour concentration of device controls at 10-15ppm;
(4) after vapor crosslinking, will fill acrylic board 50 DEG C of forced air drying 15h of film-forming soln, after dry, room temperature places 6-7h, and bath temperature is take off film after 87 DEG C of 45s that ease back;
(5) finished product.
2. a kind of stable mechanical performance type according to claim 1 eats the preparation method of composite membrane, it is characterized in that, the mixture that the softening agent described in step (1) is both glycerine and polyoxyethylene glycol, and the two mass ratio is 2:3.
3. a kind of stable mechanical performance type according to claim 1 eats the preparation method of composite membrane, it is characterized in that, softening agent described in step (1) is the mixture of glycerine, polyoxyethylene glycol and polyvinyl alcohol three, and three's mass ratio is 2:3:1.
4. a kind of stable mechanical performance type according to any one of claim 1-3 eats the preparation method of composite membrane, it is characterized in that, the board slot specification of step (2) acrylic board is length × wide × high 300 × 300 × 10mm, and pour mask amount is 100g.
5. the edible composite membrane prepared of preparation method according to claim 4, is characterized in that: this composite membrane
(1) 3 months storage periods, reserve temperature 25 DEG C, humidity 50%, edible composite membrane tensile strength only reduces 5-12%; And
(2) within 3 months storage periods, composite membrane water-permeable only increases 5-8%; And
(3) within 3 months storage periods, composite membrane oxygen-permeable only increases 3-5.5%; And
(4) within 3 months storage periods, the saturating carbonic acid gas of composite membrane only increases 2-4.5%.
6. composite membrane according to claim 5, it is characterized in that, the assessment method of mechanical stability is:
In formula: H
0---temperature is
25dEG C, humidity is the tensile strength of 50% ambient storage composite membrane after 2 days or water-permeable or oxygen-permeable or carbonic acid gas thoroughly; H
t---temperature is
25dEG C, humidity is the tensile strength of 50% ambient storage after 3 months or water-permeable or oxygen-permeable or carbonic acid gas thoroughly, 4 index comprehensives evaluation mechanical stability.
7. composite membrane according to claim 6, is characterized in that, can be directly water-soluble.
8. the application of composite membrane according to claim 7 in meat product packing inside bag.
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| CN104448368B (en) * | 2014-12-22 | 2017-07-14 | 东北农业大学 | A kind of preparation method of soybean protein isolate/PLA composite package film |
| CN110302679A (en) * | 2018-03-20 | 2019-10-08 | 中国石油化工股份有限公司 | Wet film of a kind of intelligence control and its preparation method and application |
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| CN103740117A (en) | 2014-04-23 |
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