CN108978332A - A kind of preparation method of environment-protective food package bag - Google Patents
A kind of preparation method of environment-protective food package bag Download PDFInfo
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- CN108978332A CN108978332A CN201810928124.4A CN201810928124A CN108978332A CN 108978332 A CN108978332 A CN 108978332A CN 201810928124 A CN201810928124 A CN 201810928124A CN 108978332 A CN108978332 A CN 108978332A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
- D21H19/385—Oxides, hydroxides or carbonates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D33/00—Details of, or accessories for, sacks or bags
- B65D33/01—Ventilation or drainage of bags
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
- D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/46—Non-macromolecular organic compounds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/54—Starch
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/62—Macromolecular organic compounds or oligomers thereof obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/36—Biocidal agents, e.g. fungicidal, bactericidal, insecticidal agents
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Pest Control & Pesticides (AREA)
- Dispersion Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Packages (AREA)
Abstract
The present invention relates to a kind of preparation methods of environment-protective food package bag, comprising: the following steps are included: (1), take packaging bag body, air hole is opened up in packaging bag body；(2), the ethanol solution that volumetric concentration is 20% is added to bacteriostatic starch thickener, stirring is adjusted to suitable viscosity；(3), by packaging bag body skin drying, and the bacteriostatic starch thickener in packaging bag body after coating step (1) dilution；(4), the packaging bag that step (3) is handled well is handled into 30min at 50 DEG C, is gradually heated to 220 DEG C, drying obtains environment-protective food package bag；Packaging bag provided by the invention is using paper packaging bags as matrix, bacteriostatic starch thickener is coated on paper packaging bags, starch thickener is primary raw material using cornstarch, add aerosil, nano-titanium dioxide complex, it can be not only obviously improved the intensity of starch thickener, material wear ability and bacteriostasis property can also be obviously improved.
Description
Technical field
The invention belongs to environment-friendly package material fields, and in particular to a kind of preparation method of environment-protective food package bag.
Background technique
Packaging bag refers to the sack for packing various articles, makes cargo convenient transportation in the production process of circulation, is easy
Storage.It is widely used in daily life and industrial production.Real figure shows, the polybag after having 80% use, finally and generally
Rubbish is equally transported to the processing of rubbish heap field area, and only 7 percent plastics are recovered recycling.This will certainly generate pole
Big pollution is advocated now in order to improve current situation using the material preparation packaging bag that can be degraded, many to use poly- cream
The ingredients such as acid, although have the effect of it is degradable, higher cost.
Meanwhile now in packaging fields such as food, it is desirable that material has good fungistatic effect, and silver ion etc. is often added
Substance with bactericidal effect, when use have heavy metal precipitation, may influence the health of user.
In current food packaging, many prepared food use the manner of packing of vacuum, often use plastic packaging bag now,
Such as packaging Zongzi still needs to remove plastic foil when heated, otherwise since plastic foil is airtight, cooked Zongzi
Mouthfeel is bad.
Summary of the invention
The object of the present invention is to provide a kind of preparation method of environment-protective food package bag, bacteriostatic agent safe to use,
The preparation method of packaging bag is adjusted simultaneously, improves the using effect and fungistatic effect of packaging bag.
The invention is realized by the following technical scheme:
A kind of preparation method of environment-protective food package bag, comprising: packaging bag body is provided with air hole in packaging bag body, then
Packaging bag body surface is coated in using bacteriostatic starch thickener and closes air hole；
The bacteriostatic starch thickener is made using following methods:
(1), it weighs 100g cornstarch and 4.0-4.5g calcium hydroxide is added, be placed in 230-250ml deionized water and stir
20min, and warming-in-water heats 30-35min, then cools to room temperature to 85-90 DEG C, 20-24h is placed in refrigeration at -4 DEG C,
Then room temperature is melted, and is washed 3-4 times using dehydrated alcohol, and drying obtains washings；
(2), aerosil, nano-titanium dioxide are mixed according to the ratio that mass ratio is 5:1, takes mixture 10-
15g is added in 40-50ml deionized water, and 5g polyethylene glycol and 0.5-0.8g ammonium citrate is then added, is mixed evenly
Afterwards, it is put into grinder and is ground, milling time 20-30min after milled processed, is placed in ultrasound point in ultrasonic dispersers
20-25min is dissipated, nano suspending liquid is obtained；The application is applied in combination using aeroge and nano-titanium dioxide, both be can use and is received
The bacteriostasis property of rice titanium dioxide, and polyethylene glycol and lemon can be utilized in conjunction with the good absorption property of aerosil
Lemon acid ammonium promotes aeroge and nano-titanium dioxide dispersion performance, can greatly promote the brushing performance of bacteriostatic starch thickener and glue
Attached intensity.
(3), the washings that step (1) obtains is mixed with the nano suspending liquid prepared in step (2), with 1200r/min
Speed stir 30min, be gradually heated to 180 DEG C, heating rate is 3-4 DEG C/min, keeps the temperature 2h, is then cooled to room temperature, subtracts
Pressure filters, and obtains bacteriostatic starch thickener.
The packaging bag body uses paper bag.
The nano-titanium dioxide passes through modification, and the specific method is as follows:
A, it is impregnated by nano-titanium dioxide and using the sodium hydroxide solution of 2mol/L, is stirred continuously in soaking process, then makes
Neutrality is washed to deionized water；
B, the nano-titanium dioxide after washing is impregnated using the acetic acid solution of 2mol/L, in soaking process, is shaken using ultrasonic wave
Processing 15-20min is swung, is dried at 50 DEG C, uses the silane coupling agent and nano-titanium dioxide of nano-titanium dioxide weight 0.5%
Then mixing, grinding use ultrasonication 2h, be sufficiently mixed titanium dioxide and silane coupling agent uniformly；First use acetic acid
Solution is handled, and the polarity and absorption property on nano-titanium dioxide surface can be improved, using with coupling agent and subsequent shell
Glycan is reacted, and the intensity and stability of combination are promoted；
C, take chitosan that the water of 5 times of its weight is added, it is 3-4 that glacial acetic acid is added dropwise into water and adjusts solution PH, and stirring makes chitosan
Dissolution, then mixes nano-titanium dioxide made of step b with chitosan solution by weight 1:2, ultrasonic vibration processing
30min, decompression filter, and drying obtains modified nano-titanium dioxide.
Bacteriostatic starch thickener is coated in packaging bag body and uses following methods:
(1), the ethanol solution of volumetric concentration 20% is added to bacteriostatic starch thickener, stirring is adjusted to suitable viscosity；
(2), by packaging bag body skin drying, and the bacteriostatic starch thickener in packaging bag body after coating step (1) dilution；
(3), the packaging bag that step (2) is handled well is handled into 30min at 50 DEG C, is gradually heated to 220 DEG C, drying obtains ring
Protect food pack.
Bacteriostatic starch thickener use when at 25 DEG C relative to the density of water be 1.8-2.1；Preferably, relative density is
1.95。
The diameter of aperture is 0.8-2mm in the packaging bag body.
The silane coupling agent is Silane coupling agent KH550.
Beneficial effects of the present invention: packaging bag provided by the invention is using paper packaging bags as matrix, on paper packaging bags
Bacteriostatic starch thickener is coated, starch thickener is primary raw material using cornstarch, adds aerosil, nanometer titanium dioxide
Titanium complex can not only be obviously improved the intensity of starch thickener, can also be obviously improved material wear ability and bacteriostasis property, and
And after coating, the stomata of coated paper envelope is capped, can keep good sealing effectiveness at normal temperature after being packed into food,
Under high temperature, the starch thickener of outer layer coating is decomposed, and opens the stomata in packaging bag body, and gas permeability is kept to make in boiling
Steam can enter, and promote the mouthfeel of food after boiling.
Meanwhile the material that the application is added is safe and non-toxic material, even if decomposing at high temperature, will not have been generated
Noxious material, safe effect are good；And the material in packaging bag is degradable non-poisonous substance, after use, can be dropped naturally
Solution, no pollution to the environment.
Specific embodiment
Embodiment 1
A kind of preparation method of environment-protective food package bag, comprising: packaging bag body is provided with air hole in packaging bag body, then
Packaging bag body surface is coated in using bacteriostatic starch thickener and closes air hole；
The bacteriostatic starch thickener is made using following methods:
(1), it weighs 100g cornstarch and 4.2g calcium hydroxide is added, be placed in 250ml deionized water and stir 20min, and water-bath
88 DEG C are warming up to, 30-35min is heated, then cools to room temperature, 20-24h is placed in refrigeration at -4 DEG C, and then room temperature is melted, and is made
It is washed 3-4 times with dehydrated alcohol, dries, obtain washings；
(2), aerosil, nano-titanium dioxide are mixed according to the ratio that mass ratio is 5:1, takes mixture 10-
15g is added in 45ml deionized water, and 5g polyethylene glycol and 0.65g ammonium citrate is then added, after being mixed evenly, puts
Enter in grinder and ground, milling time 20-30min after milled processed, is placed in ultrasonic disperse 20- in ultrasonic dispersers
25min obtains nano suspending liquid；
(3), the washings that step (1) obtains is mixed with the nano suspending liquid prepared in step (2), with the speed of 1200r/min
Degree stirring 30min is gradually heated to 180 DEG C, and heating rate is 4 DEG C/min, keeps the temperature 2h, is then cooled to room temperature, and decompression is taken out
Filter, obtains bacteriostatic starch thickener.
The packaging bag body uses paper bag.
The nano-titanium dioxide passes through modification, and the specific method is as follows:
A, it is impregnated by nano-titanium dioxide and using the sodium hydroxide solution of 2mol/L, is stirred continuously in soaking process, then makes
Neutrality is washed to deionized water；
B, the nano-titanium dioxide after washing is impregnated using the acetic acid solution of 2mol/L, in soaking process, is shaken using ultrasonic wave
Processing 15-20min is swung, is dried at 50 DEG C, uses the silane coupling agent and nano-titanium dioxide of nano-titanium dioxide weight 0.5%
Then mixing, grinding use ultrasonication 2h, be sufficiently mixed titanium dioxide and silane coupling agent uniformly；First use acetic acid
Solution is handled, and the polarity and absorption property on nano-titanium dioxide surface can be improved, using with coupling agent and subsequent shell
Glycan is reacted, and the intensity and stability of combination are promoted；
C, take chitosan that the water of 5 times of its weight is added, it is 3-4 that glacial acetic acid is added dropwise into water and adjusts solution PH, and stirring makes chitosan
Dissolution, then mixes nano-titanium dioxide made of step b with chitosan solution by weight 1:2, ultrasonic vibration processing
30min, decompression filter, and drying obtains modified nano-titanium dioxide.
Bacteriostatic starch thickener is coated in packaging bag body and uses following methods:
(1), the ethanol solution of volumetric concentration 20% is added to bacteriostatic starch thickener, stirring is adjusted to suitable viscosity；
(2), by packaging bag body skin drying, and the bacteriostatic starch thickener in packaging bag body after coating step (1) dilution；
(3), the packaging bag that step (2) is handled well is handled into 30min at 50 DEG C, is gradually heated to 220 DEG C, drying obtains ring
Protect food pack.
Embodiment 2
A kind of preparation method of environment-protective food package bag, comprising: packaging bag body is provided with air hole in packaging bag body, then
Packaging bag body surface is coated in using bacteriostatic starch thickener and closes air hole；
The bacteriostatic starch thickener is made using following methods:
(1), it weighs 100g cornstarch and 4.2g calcium hydroxide is added, be placed in 250ml deionized water and stir 20min, and water-bath
88 DEG C are warming up to, 30-35min is heated, then cools to room temperature, 20-24h is placed in refrigeration at -4 DEG C, and then room temperature is melted, and is made
It is washed 3-4 times with dehydrated alcohol, dries, obtain washings；
(2), aerosil, nano-titanium dioxide are mixed according to the ratio that mass ratio is 5:1, takes mixture 10-
15g is added in 45ml deionized water, and 5g polyethylene glycol and 0.65g ammonium citrate is then added, after being mixed evenly, puts
Enter in grinder and ground, milling time 20-30min after milled processed, is placed in ultrasonic disperse 20- in ultrasonic dispersers
25min obtains nano suspending liquid；
(3), the washings that step (1) obtains is mixed with the nano suspending liquid prepared in step (2), with the speed of 1200r/min
Degree stirring 30min is gradually heated to 180 DEG C, and heating rate is 4 DEG C/min, keeps the temperature 2h, is then cooled to room temperature, and decompression is taken out
Filter, obtains bacteriostatic starch thickener.
The packaging bag body uses paper bag.
Bacteriostatic starch thickener is coated in packaging bag body and uses following methods:
(1), the ethanol solution of volumetric concentration 20% is added to bacteriostatic starch thickener, stirring is adjusted to suitable viscosity；
(2), by packaging bag body skin drying, and the bacteriostatic starch thickener in packaging bag body after coating step (1) dilution；
(3), the packaging bag that step (2) is handled well is handled into 30min at 50 DEG C, is gradually heated to 220 DEG C, drying obtains ring
Protect food pack.
Comparative example 1
Compared with Example 1, aerosil is not used.
Comparative example 2
Compared with Example 1, it is handled without using polyethylene glycol and ammonium citrate.
Comparative example 3
Directly using the commercially available paper bag as bag body in embodiment 1.
Experiment 1
In order to verify the material property prepared in each experimental group, the performance of the paper bag of the application each group method preparation is tested,
As a result such as table 1:
Table 1
Note: the quantification of 100g/m of the paper bag of test2。
It is 5 × 10 by concentration when fungistatic effect is tested6The Escherichia coli of cfu/mL, being uniformly applied to multiple groups diameter is
In the culture dish containing nutrient agar of 100mm, each group non-woven fabrics is intercepted to the print that radius is 3cm, is laid in respectively above-mentioned
Each group culture dish is placed in 35 DEG C of insulating box and cultivates 72h by center in culture dish, measures clump count on each non-woven fabrics print
Amount.
Permeability test uses agricultural products storage and preservation research institute of academy of agricultural sciences of Shaanxi Province, and Wang Liang etc. " compares food wrapper
The simple and easy method of gas permeability " in test method, using "+" quantity indicate gas permeability, gas permeability is better, and "+" quantity is more.
As shown in Table 1, the tensile strength of material in the application is high, and burst index and biocidal property are passed through by being obviously improved
The thickener of the application is coated on paper bag surface, can also be obviously improved the gas permeability of paper bag.
Experiment 2
In order to further verify the modified influence to material property of nano-titanium oxide, different control experiments is set,
Comparative example 4
Compared with Example 1, nano-titanium dioxide modified to be impregnated in the process without using acetic acid solution.
Comparative example 5
Compared with Example 1, silane coupling agent is added without in nano-titanium dioxide treatment process.
Comparative example 6
Compared with Example 1, it in nano-titanium dioxide modified processing, is handled without using step c.
Influence of the Different treatments to wrapping paper performance is counted, as a result such as table 2:
Table 2:
Note: wearability and fungistatic effect test mode such as experiment 1；
Titanium dioxide stability is surveyed for being characterized in nonwoven cloth material the content of titanium dioxide that can dissociate using metal aluminum reduction method
It is fixed, before test, 10g non-woven fabrics is impregnated into 2h using the sulfuric acid solution of 2mol/L, then measures content of titanium dioxide in solution, by
Lower in content, the application is characterized by relative amount, and free titanium dioxide is not detected in "-" expression, and "+" indicates detection free two
Titanium oxide, the bright free content of titanium dioxide of "+" more multilist are higher.
As shown in Table 2, after distinct methods modified nano-titanium dioxide, can intensity to wrapping paper and wearability cause to bear
Face is rung, and the application improves stability of the titanium dioxide in system, Bu Huiyou by being modified to titanium dioxide
It separates out to be polluted to food.
Claims (6)
1. a kind of preparation method of environment-protective food package bag, which comprises the following steps: (1), take packaging bag body,
Air hole is opened up in packaging bag body；
(2), the ethanol solution that volumetric concentration is 20% is added to bacteriostatic starch thickener, stirring is adjusted to suitable viscosity；
(3), by packaging bag body skin drying, and the bacteriostatic starch thickener in packaging bag body after coating step (1) dilution；
(4), the packaging bag that step (3) is handled well is handled into 30min at 50 DEG C, is gradually heated to 220 DEG C, drying obtains ring
Protect food pack；
The bacteriostatic starch thickener is made using following methods:
(1), it weighs 100g cornstarch and 4.0-4.5g calcium hydroxide is added, be placed in 230-250ml deionized water and stir
20min, and warming-in-water heats 30-35min, then cools to room temperature to 85-90 DEG C, 20-24h is placed in refrigeration at -4 DEG C,
Then room temperature is melted, and is washed 3-4 times using dehydrated alcohol, and drying obtains washings；
(2), aerosil, nano-titanium dioxide are mixed according to the ratio that mass ratio is 5:1, takes mixture 10-
15g is added in 40-50ml deionized water, and 5g polyethylene glycol and 0.5-0.8g ammonium citrate is then added, is mixed evenly
Afterwards, it is put into grinder and is ground, milling time 20-30min after milled processed, is placed in ultrasound point in ultrasonic dispersers
20-25min is dissipated, nano suspending liquid is obtained；
(3), the washings that step (1) obtains is mixed with the nano suspending liquid prepared in step (2), with the speed of 1200r/min
Degree stirring 30min is gradually heated to 180 DEG C, and heating rate is 3-4 DEG C/min, keeps the temperature 2h, is then cooled to room temperature, and decompression is taken out
Filter, obtains bacteriostatic starch thickener.
2. a kind of preparation method of environment-protective food package bag according to claim 1, which is characterized in that the packaging bag sheet
Body uses paper bag.
3. a kind of preparation method of environment-protective food package bag according to claim 1, it is characterised in that: the nano-silica
Change titanium and pass through modification, the specific method is as follows:
A, it is impregnated by nano-titanium dioxide and using the sodium hydroxide solution of 2mol/L, is stirred continuously in soaking process, then makes
Neutrality is washed to deionized water；
B, the nano-titanium dioxide after washing is impregnated using the acetic acid solution of 2mol/L, in soaking process, is shaken using ultrasonic wave
Processing 15-20min is swung, is dried at 50 DEG C, uses the silane coupling agent and nano-titanium dioxide of nano-titanium dioxide weight 0.5%
Then mixing, grinding use ultrasonication 2h, be sufficiently mixed titanium dioxide and silane coupling agent uniformly；
C, take chitosan that the water of 5 times of its weight is added, it is 3-4 that glacial acetic acid is added dropwise into water and adjusts solution PH, and stirring makes chitosan
Dissolution, then mixes nano-titanium dioxide made of step b with chitosan solution by weight 1:2, ultrasonic vibration processing
30min, decompression filter, and drying obtains modified nano-titanium dioxide.
4. a kind of preparation method of environment-protective food package bag described in one of -3 according to claim 1, it is characterised in that: the packet
Pack the quantification of 100g/m of ontology2。
5. a kind of preparation method of environment-protective food package bag according to claim 1, it is characterised in that: bacteriostatic starch thickener
When use at 25 DEG C relative to the density of water be 1.8-2.1.
6. a kind of preparation method of environment-protective food package bag according to claim 4, it is characterised in that: the packaging bag sheet
The diameter of aperture is 0.8-2mm on body.
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