CN109749108A - A kind of edible tapioca composite package film and its preparation method and application - Google Patents
A kind of edible tapioca composite package film and its preparation method and application Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/90—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in food processing or handling, e.g. food conservation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
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Abstract
The invention discloses a kind of edible tapioca composite package films and its preparation method and application.Preparation method is as follows: tapioca is configured to starch solution, then starch liquor heating is stirred to gelatinization, it adds glycerol and modified nanometer cellulose continues heating stirring, film liquid is obtained into after the reaction was completed, will obtain edible tapioca composite package film at casting film-forming after film liquid ultrasound, row's bubble.The entire process flow of the present invention is environmentally protective, experimentation is simple, the tapioca composite package film prepared, there are stronger mechanical performance and hydrophobic performance, wherein tensile strength is 5.47318MPa, elasticity modulus is 28.69462MPa, and contact angle is 57.97 °, be may be used in the fresh-keeping packaging of fresh fruit of vegetables.
Description
Technical field
The invention belongs to prepare the technical field of degradable green packaging material, in particular to a kind of edible tapioca is multiple
Close packaging film and its preparation method and application.
Background technique
The problems such as in face of environmental pollution and safety, each state are all striving to find one kind " green package " material come replacement
Packaging material is learned, to reduce " white pollution ", improves foodsafety.So exploitation is with edible made of natural biologic material
Property packaging have become a main trend of World of Food industrial technology development, and following food packaging industry development is main
Direction.Starch is a kind of agriculture polymer from a wealth of sources, renewable, inexpensive and biodegradable, it is considered to be is used for
The potential substitute of the synthetic polymer of packaging applications.Wherein tapioca is cheap, and source is wide, has good film forming
The features such as property, biocompatibility and biodegradability.Film made from this has good translucency, grease resistance and heat-sealing
Performance；But pure tapioca film brittleness is big and is dissolved in hot water or cold water, thus its application is restricted.
Nano-cellulose be it is a kind of extracted from native cellulose by chemical method, Mechanical Method or bioanalysis it is novel
Nano material, one-dimensional size, hereinafter, nano-cellulose not only has the basic structure and performance of cellulose, also have in 100nm
It has any different in the characteristic of the nano particle of native cellulose.As (1) nano-cellulose have higher Young's modulus, intensity and
Stress；(2) much bigger than the cellulose of threadiness of its chemical reactivity, it is easier to carry out chemical modification；(3) it is with huge
Specific surface area, because the variation in terms of chemistry, physical property caused by dimensional effect can substantially change the light, electricity, magnetic etc. of material
Performance can optimize the performance of cellulose to a certain extent, and broadening cellulose is before the application in the fields such as fine chemistry industry, material
Scape, and by the way that it can also be widened in the application range of composite material after to modifying nanometer cellulose, improving its dispersibility.But at present
There are no a kind of methods for combining hydrophobically modified nano-cellulose with tapioca and preparing packaging composite film.
Summary of the invention
In order to overcome the shortcomings and deficiencies of the prior art described above, the primary purpose of the present invention is that providing a kind of edible cassava
The preparation method of starch composite package film.
Another object of the present invention is to provide the edible tapioca composite package film that the above method is prepared.
Still a further object of the present invention is that providing above-mentioned edible tapioca composite package film is preparing the fresh-keeping packet of fresh fruit of vegetables
Application in dress.
The purpose of the present invention is realized by following proposal:
A kind of preparation method of edible tapioca composite package film, specifically includes the following steps:
Tapioca is configured to starch solution, then stirs starch liquor heating to gelatinization, add glycerol and is changed
Property nano-cellulose continue heating stirring, obtain into film liquid after the reaction was completed, will at film liquid ultrasound, row bubble after casting film-forming obtain
Edible tapioca composite package film.
The tapioca is also by following pretreatment: relative humidity (RH) be 30~50% placement at room temperature 24~
48h；Preferred relative humidity is 40%.
The concentration of starch is 3.0~6.0wt%, preferably 4.5wt% in the starch solution.
Front and back twice heating stirring condition be 78~88 DEG C of 20~35min of stirring；30min is stirred at preferably 85 DEG C.
The glycerol is being 25~35wt% at the mass fraction in film liquid.
The modified nanometer cellulose is being 0.5~5wt% at the mass fraction in film liquid；Preferably 1~2wt%, more
Preferably 1.5wt%.
Preferably, the modified nanometer cellulose is dissolved in 70~90 DEG C with dehydrated alcohol in advance before addition；It is excellent
It is selected as dissolving at 78 DEG C.
The time of the ultrasound is 5~10min；
Row's bubble is the 20~30min that deaerates under 0.09MPa vacuum degree condition.
The casting film-forming is that the liquid stream that will form a film is prolonged in plastic containers, dry 6 at 30~50 DEG C~for 24 hours；When dry
Between preferably 12h.
The modified nanometer cellulose is prepared by following methods: nano-cellulose suspension is mixed with organic solvent
It is ultrasonic afterwards, it adds stearic acid continuation ultrasound and obtains mixed liquor, be then stirred to react mixed liquor to obtain composite solution, after purification
It is dried to obtain modified nanometer cellulose.
The organic solvent is at least one of dehydrated alcohol and ethyl acetate.
The concentration of the nano-cellulose suspension is 15%~25wt%；
The nano-cellulose suspension, organic solvent and stearic material ratio be 30~40mL:80~100mL:1~
1.5g；Preferably 30mL:100mL:1.5g.
The first time is ultrasonic and second of ultrasonic time is respectively 20~30min.
It is described to be stirred to react specially first by mixed liquor in 70~80 DEG C of 6~8h of stirring, then it is stirred at room temperature 4~
6h；Preferably first by mixed liquor in 78 DEG C of stirring 8h, 5h is then stirred at room temperature.
The purifying refers to is added dehydrated alcohol in composite solution, after centrifugation that sediment is dry at 40~60 DEG C；
It is dry preferably at 50 DEG C.
In the preparation of modified nanometer cellulose, the nano-cellulose suspension is specifically prepared by the following steps to obtain: will
Cellulose powder is stirred to react after mixing with aqueous sulfuric acid, and finally plus water terminates reaction and obtains reaction product, then purified obtained
Nano-cellulose suspension.
The concentration of the aqueous sulfuric acid is 60~65wt%, preferably 64wt%.
The mass volume ratio of the cellulose powder and aqueous sulfuric acid is 50~80mg/mL, preferably 66.7mg/mL.
The condition being stirred to react be stirred to react 100 in 45~50 DEG C of speed with 200~300r/min~
120min；Preferably in 46 DEG C of speed responsing 100min with 300r/min.
The dosage of the water meets the corresponding addition 100~300mL water of every 10g cellulose powder, preferably addition 200mL water.
The purifying is specially after reaction product is stood 8~15h, to be centrifuged with high-speed refrigerated centrifuge, then by sediment
It is dialysed with bag filter to neutrality after being diluted with water；Preferably, time of repose 8h, the molecular cut off of bag filter is 8000~
14000u。
A kind of edible cassava starch composite package film being prepared according to the above method.
Above-mentioned edible cassava starch composite package film is preparing the application in fresh fruit of vegetables fresh-keeping packaging.
Mechanism of the invention:
With-the OH in nano-cellulose dehydration condensation can occur for a large amount of-COOH in stearic acid, while in nanometer
Cellulose surface introduces hydrophobic grouping-CH3, to weaken the surface polarity of nano-cellulose, enhance pure starch packaging film etc.
The hydrophobicity of the bio-based materials of hydrophobic performance difference.
The present invention compared with the existing technology, have the following advantages and the utility model has the advantages that
1, the present invention is in the preparation process of Cellulose nanocrystal, and using common mature technology-acid hydrolyzation, preparation is received
Rice cellulose crystallity is high, and diameter is small, and size distribution is stablized, within the scope of 15~27nm.
2, the present invention is modified using nano-cellulose progress surface hydrophobicity of the food-grade stearic acid to preparation, assigns Nanowire
Plain hydrophobicity is tieed up, modifying process Green is environmentally friendly, and experimentation is simple.
3, the nano-cellulose of hydrophobically modified is dissolved in advance with dehydrated alcohol, so that the compatibility with starch solution is fine,
Uniform tapioca composite package film is prepared, mechanical performance and hydrophobicity are effectively enhanced, composite package film and pure wood
Sweet potato starch film is compared, tensile strength, and elasticity modulus and contact angle enhance 228%, 298%, 51.36% respectively, is expected to apply
Into the fresh-keeping packaging of fresh fruit of vegetables.
Detailed description of the invention
Fig. 1 is the preparation technology figure of edible tapioca composite package film.
Specific embodiment
Below with reference to embodiment and attached drawing, the present invention is described in further detail, but embodiments of the present invention are unlimited
In this.
Agents useful for same can routinely be bought unless otherwise specified from market in embodiment.Room temperature of the present invention refers to 20
~30 DEG C.
Embodiment 1
(1) cellulose powder (MW=162.06, the manufacturer: Shanghai Aladdin of 10g the preparation of nano-cellulose: are weighed
Biochemical technology limited liability company.) it is placed in beaker, the concentrated sulfuric acid solution that 150mL concentration is 63wt% is then added into beaker,
And stirred with glass bar, it is made into mixed solution；It then is 45 DEG C in temperature by mixed solution, the condition of mixing speed 200r/min
Lower reaction 100min；200mL distilled water is added and terminates reaction；10min is handled with high-speed refrigerated centrifuge after standing 8h, revolving speed is
10000r/min outwells supernatant, adds distilled water to be diluted to 400mL remaining jelly, then move into bag filter (MD77,
Molecular cut off: 8000~14000u) in, it dialyses in the distilled water of flowing, until liquid at neutrality, obtains nanofiber
Plain suspension.
(2) preparation of modified nanometer cellulose: taking concentration obtained by 30mL step (1) is 15wt% nano-cellulose suspension
It is configured to mixed liquor with 80mL dehydrated alcohol, then it is stearic to add 1g food-grade by the ultrasound 20min in sonicator
Acid continues ultrasound 20min, then by the mixed liquor after ultrasound in magnetic force thermostatic mixer closed stirring 6h at 70 DEG C, then
Room temperature magnetic agitation 4h obtains stable composite solution again, and 80mL dehydrated alcohol is finally added in composite solution and is centrifuged,
Supernatant is removed, residue is dried into 8h in 40 DEG C of air dry ovens, is finally obtained with the stearic acid modified of hydrophobic performance
Nano-cellulose.
By characterization, nano-cellulose size range obtained is in 15~23nm, crystallinity index 90.07%.
Embodiment 2
(1) preparation of nano-cellulose: the cellulose powder for weighing 10g is placed in beaker, and it is dense that 150mL is then added into beaker
Degree is the concentrated sulfuric acid solution of 64wt%, and is stirred with glass bar, is made into mixed solution；It then is 47.5 in temperature by mixed solution
DEG C, 110min is reacted under conditions of mixing speed 250r/min；200mL distilled water is added and terminates reaction；Freezing is used after standing 8h
Supercentrifuge handles 10min, and revolving speed 10000r/min outwells supernatant, adds distilled water to be diluted to remaining jelly
450mL is then moved into bag filter (MD77, molecular cut off: 8000~14000u), is dialysed in the distilled water of flowing, directly
To liquid at neutrality, nano-cellulose suspension is obtained.
(2) preparation of modified nanometer cellulose: taking concentration obtained by 35mL step (1) is 20wt% nano-cellulose suspension
It is configured to mixed liquor with 80mL dehydrated alcohol, ultrasound 25min, it is hard then to add 1.25g food-grade in sonicator
Resin acid continues ultrasound 25min, then by the mixed liquor after ultrasound in magnetic force thermostatic mixer closed stirring 7h at 75 DEG C, so
Room temperature magnetic agitation 5h obtains stable composite solution again afterwards, finally in composite solution be added 80mL dehydrated alcohol carry out from
The heart removes supernatant, and residue is dried 10h in 50 DEG C of air dry ovens, finally obtains the stearic acid with hydrophobic performance
Modified nanometer cellulose.
By characterization, nano-cellulose size range obtained is in 17~26nm, crystallinity index 87.3%.
Embodiment 3
(1) preparation of nano-cellulose: the cellulose powder for weighing 10g is placed in beaker, and it is dense that 150mL is then added into beaker
Degree is the concentrated sulfuric acid solution of 65wt%, and is stirred with glass bar, is made into mixed solution；It then is 50 in temperature by mixed solution
DEG C, 120min is reacted under conditions of mixing speed 300r/min；200mL distilled water is added and terminates reaction；Freezing is used after standing 8h
Supercentrifuge handles 10min, and revolving speed 10000r/min outwells supernatant, adds distilled water to be diluted to remaining jelly
500mL is then moved into bag filter (MD77, molecular cut off: 8000~14000u), is dialysed in the distilled water of flowing, directly
To liquid at neutrality, nano-cellulose suspension is obtained.
(2) preparation of modified nanometer cellulose: the nano-cellulose that concentration obtained by 40mL step (1) is 25wt% is taken to suspend
Liquid and 80mL dehydrated alcohol are configured to mixed liquor, and ultrasound 30min, it is hard then to add 1.5g food-grade in sonicator
Resin acid continues ultrasound 30min, then by the mixed liquor after ultrasound in magnetic force thermostatic mixer closed stirring 8h at 80 DEG C, so
Room temperature magnetic agitation 6h obtains stable composite solution again afterwards, finally in composite solution be added 80mL dehydrated alcohol carry out from
The heart removes supernatant, and residue is dried 15h in 50 DEG C of air dry ovens, finally obtains the stearic acid with hydrophobic performance
Modified nanometer cellulose.
By characterization, nano-cellulose size range obtained is in 16~27nm, crystallinity index 91.03%.
Embodiment 4
Tapioca is maintained in the drier of 40% relative humidity (RH) 24 hours at room temperature, then weighs 2.1g
Tapioca, be configured to concentration be 4.0wt% starch solution, stir evenly, then in temperature constant magnetic stirring machine, 78
Magnetic agitation 25min at DEG C；After starch gelatinization, glycerol and embodiment 1 gained modified nanometer cellulose (glycerol and modification is added
Nano-cellulose is being respectively 25wt% and 1.0wt% at the mass fraction in film liquid, and modified nanometer cellulose is used anhydrous in advance
Ethyl alcohol is dissolved at 78 DEG C), continue stirring 25min at a constant temperature and obtains into film liquid；To after the reaction was completed, surpass at film liquid
Then ultrasound 5min in sound washer deaerates film forming solution 20min under 0.09MPa vacuum degree condition, drive away in film liquid
Bubble prevents formed film from having hole.It finally weighs film forming liquid stream to prolong in the plastic culture dish of given volume, is placed in electric heating drum
In wind drying box, dry 12h, takes off film after taking-up at 30 DEG C.
It is tested through mechanical performance and hydrophobicity, composite membrane (with a thickness of 160 μm) tensile strength of this technique and formula preparation
For 4.6812MPa, elasticity modulus 23.49112MPa, contact angle is 53.96 °.
Embodiment 5
Tapioca is maintained in the drier of 40% relative humidity (RH) 36 hours at room temperature, then weighs 2.1g
Tapioca, be configured to concentration be 5.0wt% starch solution, stir evenly, then in temperature constant magnetic stirring machine, 83
Magnetic agitation 27min at DEG C；After starch gelatinization, glycerol and embodiment 2 gained modified nanometer cellulose (glycerol and modification is added
Nano-cellulose is respectively 30wt% and 1.5wt% in the mass fraction at film liquid, and modified nanometer cellulose uses anhydrous second in advance
Alcohol is dissolved at 78 DEG C), continue stirring 25min at a constant temperature and obtains into film liquid；It, will be at film liquid in ultrasound to after the reaction was completed
Then ultrasound 7min in washer deaerates film forming solution 25min under 0.09MPa vacuum degree condition, drive away into gas in film liquid
Bubble prevents formed film from having hole.It finally weighs film forming liquid stream to prolong in the plastic culture dish of given volume, is placed in electric heating air blast
In drying box, dry 12h, takes off film after taking-up at 40 DEG C.
It is tested through mechanical performance and hydrophobicity, this technique and composite membrane (153 μm of thickness) tensile strength of formula preparation are
5.47318MPa, elasticity modulus 28.69462MPa, contact angle are 57.97 °
Embodiment 6
Tapioca is maintained in the drier of 40% relative humidity (RH) 48 hours at room temperature, then weighs 2.1g
Tapioca, be configured to concentration be 6.0wt% starch solution, stir evenly, then in temperature constant magnetic stirring machine, 88
Magnetic agitation 30min at DEG C；After starch gelatinization, glycerol and embodiment 3 gained modified nanometer cellulose (glycerol and modification is added
Nano-cellulose is respectively 30wt% and 2.0wt% in the mass fraction at film liquid, and modified nanometer cellulose uses anhydrous second in advance
Alcohol is dissolved at 78 DEG C), continue stirring 30min at a constant temperature and obtains into film liquid；It, will be at film liquid in ultrasound to after the reaction was completed
Then ultrasound 10min in washer deaerates film forming solution 30min under 0.09MPa vacuum degree condition, drive away into gas in film liquid
Bubble prevents formed film from having hole.It finally weighs film forming liquid stream to prolong in the plastic culture dish of given volume, is placed in electric heating air blast
In drying box, dry 12h, takes off film after taking-up at 50 DEG C.
It is tested through mechanical performance and hydrophobicity, composite membrane (with a thickness of 167 μm) tensile strength of this technique and formula preparation
For 3.17200MPa, elasticity modulus 21.51153MPa, contact angle is 51.60 °.
Comparative example 1
Comparative example 1 and embodiment 4 be not the difference is that add modified nanometer cellulose.
It is tested through mechanical performance and hydrophobicity, pure tapioca film (with a thickness of 143 μm) tensile strength is 1.2310MPa,
Elasticity modulus is 9.39482MPa, and contact angle is 35.20 °；4 gained composite package film of embodiment compared with pure tapioca film,
Tensile strength, elasticity modulus and contact angle enhance 157%, 129%, 53.30% respectively.
Comparative example 2
Comparative example 2 and embodiment 5 be not the difference is that add modified nanometer cellulose.
It is tested through mechanical performance and hydrophobicity, pure tapioca film (with a thickness of 146 μm) tensile strength is 1.75020MPa,
Elasticity modulus is 7.20050MPa, and contact angle is 38.30 °；5 gained composite package film of embodiment compared with pure tapioca film,
Tensile strength, elasticity modulus and contact angle enhance 228%, 298%, 51.36% respectively.
Comparative example 3
Comparative example 3 and embodiment 6 be not the difference is that add modified nanometer cellulose.
It is tested through mechanical performance and hydrophobicity, pure tapioca film (with a thickness of 150 μm) tensile strength is 1.9262MPa,
Elasticity modulus is 6.47485MPa, and contact angle is 39.10 °；6 gained composite package film of embodiment compared with pure tapioca film,
Tensile strength, elasticity modulus and contact angle enhance 64.67%, 232%, 31.97% respectively.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (10)
1. a kind of preparation method of edible tapioca composite package film, which is characterized in that specifically includes the following steps:
Tapioca is configured to starch solution, then stirs starch liquor heating to gelatinization, glycerol is added and modification is received
Rice cellulose continues heating stirring, obtains into film liquid after the reaction was completed, will obtain at casting film-forming after film liquid ultrasound, row's bubble edible
Tapioca composite package film.
2. the preparation method of edible tapioca composite package film according to claim 1, it is characterised in that:
The concentration of starch is 3.0~6.0wt% in the starch solution；
The glycerol is 25~35wt% in the mass fraction at film liquid；
The modified nanometer cellulose is being 0.5~5wt% at the mass fraction in film liquid.
3. the preparation method of edible tapioca composite package film according to claim 1, it is characterised in that:
Front and back twice heating stirring condition be in 78~88 DEG C of 20~35min of stirring.
4. the preparation method of edible tapioca composite package film according to claim 1, it is characterised in that:
The tapioca is also by following pretreatment: being 30~50% at least to place at room temperature for 24 hours in relative humidity；
The modified nanometer cellulose is dissolved in 70~90 DEG C with dehydrated alcohol in advance before addition；
The time of the ultrasound is 5~10min；
Row's bubble is the 20~30min that deaerates under 0.09MPa vacuum degree condition.
5. the preparation method of edible tapioca composite package film according to any one of claims 1 to 4, feature exist
In:
The modified nanometer cellulose is prepared by following methods: being surpassed after nano-cellulose suspension is mixed with organic solvent
Sound adds stearic acid continuation ultrasound and obtains mixed liquor, is then stirred to react to obtain composite solution for mixed liquor, dry after purification
Obtain modified nanometer cellulose.
6. the preparation method of edible tapioca composite package film according to claim 5, it is characterised in that:
The organic solvent is at least one of dehydrated alcohol, ethyl acetate；
The concentration of the nano-cellulose suspension is 15-25wt%；
The nano-cellulose suspension, organic solvent and stearic material ratio be 30~40mL:80~100mL:1~
1.5g。
7. the preparation method of edible cassava starch composite package film according to claim 5, it is characterised in that:
The first time is ultrasonic and second of ultrasonic time is respectively 20~30min；
It is described to be stirred to react specially first by mixed liquor in 70~80 DEG C of 6~8h of stirring, 4~6h is then stirred at room temperature；
The purifying refers to is added dehydrated alcohol in composite solution, after centrifugation that sediment is dry at 40~60 DEG C.
8. the preparation method of edible cassava starch composite package film according to claim 5, it is characterised in that:
The nano-cellulose suspension is specifically prepared by the following steps to obtain: stirring after cellulose powder is mixed with aqueous sulfuric acid
Reaction is mixed, finally plus water terminates reaction and obtains reaction product, then purified obtained nano-cellulose suspension.
9. a kind of edible cassava starch composite package film that the method for any one according to claim 1~8 is prepared.
10. edible cassava starch composite package film is preparing answering in fresh fruit of vegetables fresh-keeping packaging according to claim 9
With.
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| CN110396768A (en) * | 2019-07-23 | 2019-11-01 | 李光宽 | A kind of food packaging digestion resistant modified PE film and preparation method thereof |
| CN112898615A (en) * | 2021-02-03 | 2021-06-04 | 南昌大学 | Mesona chinensis polysaccharide/nano TiO2Dolichos starch multifunctional composite film and preparation method thereof |
| CN112931612A (en) * | 2021-04-09 | 2021-06-11 | 南昌大学 | Mango postharvest preservation method |
| CN113817194A (en) * | 2021-10-29 | 2021-12-21 | 江南大学 | Hydrophobic thermoplastic degradable microcrystalline cellulose/starch film and preparation method thereof |
| CN114015104A (en) * | 2021-12-02 | 2022-02-08 | 南京农业大学 | Production technology of environment-friendly food packaging film with freezing acceleration function |
| WO2022047562A1 (en) * | 2020-09-02 | 2022-03-10 | Ufrgs - Universidade Federal Do Rio Grande Do Sul | Hydrophobic starch polymer, process for obtaining same, composition, process for obtaining the composition, coating method and use of the hydrophobic starch polymer |
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Application publication date: 20190514 |