CN108822408A - A kind of high temperature resistant anti-pollution takes off the preparation method of epiphragma - Google Patents
A kind of high temperature resistant anti-pollution takes off the preparation method of epiphragma Download PDFInfo
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- CN108822408A CN108822408A CN201810755920.2A CN201810755920A CN108822408A CN 108822408 A CN108822408 A CN 108822408A CN 201810755920 A CN201810755920 A CN 201810755920A CN 108822408 A CN108822408 A CN 108822408A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B31/00—Preparation of derivatives of starch
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
- C08B37/0006—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid
- C08B37/0024—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid beta-D-Glucans; (beta-1,3)-D-Glucans, e.g. paramylon, coriolan, sclerotan, pachyman, callose, scleroglucan, schizophyllan, laminaran, lentinan or curdlan; (beta-1,6)-D-Glucans, e.g. pustulan; (beta-1,4)-D-Glucans; (beta-1,3)(beta-1,4)-D-Glucans, e.g. lichenan; Derivatives thereof
- C08B37/0027—2-Acetamido-2-deoxy-beta-glucans; Derivatives thereof
- C08B37/003—Chitin, i.e. 2-acetamido-2-deoxy-(beta-1,4)-D-glucan or N-acetyl-beta-1,4-D-glucosamine; Chitosan, i.e. deacetylated product of chitin or (beta-1,4)-D-glucosamine; Derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2403/00—Characterised by the use of starch, amylose or amylopectin or of their derivatives or degradation products
- C08J2403/04—Starch derivatives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2405/00—Characterised by the use of polysaccharides or of their derivatives not provided for in groups C08J2401/00 or C08J2403/00
- C08J2405/08—Chitin; Chondroitin sulfate; Hyaluronic acid; Derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/20—Carboxylic acid amides
Abstract
The present invention relates to the preparation methods that a kind of high temperature resistant anti-pollution takes off epiphragma, belong to and take off epiphragma preparation technical field.The present invention is hydrolyzed in an acidic solution as raw material using cornstarch and potato starch and carries out high-temperature process, using organosilane-modified, hydrolysis using hydrochloric acid to starch, reinforce the high temperature resistance and stability of starch granules, starch is modified using organosilan, to improve the heat resistance for taking off epiphragma；The present invention is using shrimp shell as raw material, in acid condition and hydrolyzed under basic conditions, with good antibacterial effect, these groups can generate covalent bond absorption with the other molecules taken off in epiphragma, the polymeric matrix being plasticized needed for enabling is more prone to produce bond effect, silane coupling agent makes introducing plurality of stable functional group in starch be allowed to that covalent bond, hydrogen bond and the absorption of other Chemical bondings is more readily formed the modification of starch simultaneously, and organosilan can make to take off epiphragma and be insoluble in water and grease to enhance stain resistance, have broad application prospects.
Description
Technical field
The present invention relates to the preparation methods that a kind of high temperature resistant anti-pollution takes off epiphragma, belong to and take off epiphragma preparation technical field.
Background technique
It takes off epiphragma and occurs that instant noodle bowl bread fills earliest, then the packaging of bean curd, Yoghourt, jelly, pudding etc. is also all
Occur taking off epiphragma.Take off the requirement that epiphragma has the following aspects：Higher barrier property, moderate heat sealability, sealing will have
Good resistance tocrocking.It realizes and takes off the lift-off technology of lid function mainly based on following three kinds of methods：Delamination, interface stripping
From the removing of, cohesion.
Since the packagings such as tinned fruit, canned meat, canned fish, congee class need to be subjected to 110 DEG C~121 in process of production
DEG C high-temperature sterilization handles half an hour a to hour, and packaging skill of the epiphragma in conjunction with polypropylene cup body is taken off in conventional composite flexible package
Art is mainly used for the processed food packaging field such as room temperature or low temperature jelly, Yoghourt, pudding.The combination of such epiphragma and polypropylene cup
Body cannot bear high-temperature heating treatment, and the problems such as sealing property is poor, barrier property resistance tocrocking is poor is easy to appear after high-temperature heating treatment.
What is occurred earliest takes off the composite construction that epiphragma is aluminium foil and hot melt adhesive, take off at present epiphragma Facing material be mostly nylon, polyester or
Paper, intermediate barrier layer have vacuum aluminum-coated, also have and plate silica or aluminium oxide on PET, this kind of to aluminize or plate answering for silicon fiml
It is relatively also higher and inconvenient to close process costs.In addition, the existing epiphragma of taking off with high barrier is usually PE substrate,
Intolerant to 121 DEG C of thermophilic digestion.And the epiphragma of taking off for having other substrates of high-temperature cooking performance does not often have high-barrier
Property.
With the development of society, the improvement of people's living standards, the prevalence of instant food, take off epiphragma and start gradually to be applied to
The products such as pasteurized products such as can, congee class, and its glass bottle and jar and can start to be replaced with polypropylene cup material, and
Existing epiphragma is not amenable to 121 DEG C of high temperature sterilization, after being subjected to autoclaving process, epiphragma meeting Automatic-falling, removing, and
Its removing mode belongs to interface peel, the size of peeling force（Heat seal strength）Bigger, heat-sealing window is influenced by condition when sealing
Mouth relative narrower.In view of epiphragma needs high temperature sterilization, removing mode is preferably by the way of cohesion removing, since cohesion removing is broken
Bad is the hot sealing layer of itself, and the preparation process for sealing layer film is more demanding, and generalling use coated heat sealing adhesive process will
Heat-seal adhesive coating with easily peelable property makes it have easy peelability with epiphragma heat cover, but existing takes off epiphragma still not
Being able to satisfy there is heat-resisting quantity to have good antifouling property again.
Therefore, invent the high temperature resistant anti-pollution that a kind of high temperature resistance is good and antifouling property is good take off epiphragma to take off epiphragma preparation skill
Art field has positive effect.
Summary of the invention
The technical problems to be solved by the invention：Insufficient for epiphragma heat resistance is taken off at present, the defect of stain resistance difference mentions
A kind of high temperature resistant anti-pollution has been supplied to take off the preparation method of epiphragma.
In order to solve the above technical problems, the technical solution adopted by the present invention is that：
A kind of high temperature resistant anti-pollution takes off the preparation method of epiphragma, it is characterised in that specifically preparation step is：
（1）By etc. quality cornstarch and potato starch mix be laid on beaker bottom, beaker is put into vacuum oven,
Heating is vacuumized, mixed-powder is made in isothermal reaction；
（2）By above-mentioned mixed-powder and distilled water in mass ratio 2:In 3 investment beakers, beaker is put into ultrasonic vibration instrument ultrasonic
Mixing suspension is made in concussion after concussion, salt acid for adjusting pH value is added dropwise into mixing suspension to 3.0~4.0, after mixing
Suction filtration obtains filter residue, after filter residue is washed with distilled water 3~5 times, is placed in oven and dried, obtains desciccate；
（3）By above-mentioned desciccate and vinyltrimethoxysilane in mass ratio 1：2 are stirred in investment beaker, by beaker
It is placed in heated at constant temperature in water-bath, is filtered after heating and obtains filter cake, with dehydrated alcohol and distillation water washing filter cake 3~5 times
After be put into microwave reactor 50~70min of calcining, be put into grinder and grind after calcining, cross 300 meshes and obtain sieving, it is standby
With；
（4）It weighs 600~800g shrimp shell and is put into grinder and grind, impregnated after grinding with sodium hydroxide solution, and in water-bath item
Alkaline filter residue is obtained by filtration in isothermal reaction under part, salt acid dip will be used after alkaline filter residue wash with distilled water 4~8 times, with stirring
Device stirs 18~20h with the revolving speed of 600~800r/min, and acid slag is obtained by filtration after stirring, sour wash with distilled water
Property filter residue 4~8 times after use 40~50min of dioxygen water retting, oxidation filter residue is obtained by filtration, will oxidation filter residue be placed in oven and dried
Reaction product is made；
（5）According to parts by weight, by above-mentioned 5~7 parts of reaction products, 4~6 parts of spare sievings, 35~40 parts of polypropylene
Grain, 2~3 parts of polyethylene and 1.0~1.5 parts of oleamides are placed in three-dimensional blender and mixing, put into extruder and squeeze after mixing
Out, it and is laid on chilling roller surface and takes off epiphragma to get high temperature resistant anti-pollution.
Step（1）Described in vacuum oven be evacuated to vacuum degree be 90~100Pa, warming temperature to 110~120
DEG C, the isothermal reaction time is 30~40min.
Step（2）Described in ultrasonic vibration instrument in frequency be 35~40kHz, the ultrasonic vibration time be 4~6h, hydrochloric acid
Mass fraction be 4~7%, speed of agitator is 300~350r/min, and mixing time is 60~70min, the temperature in baking oven
Degree is 50~60 DEG C, and drying time is 10~12h.
Step（3）Described in water-bath in bath temperature be 60~70 DEG C, the heated at constant temperature time be 30~40min,
Temperature in microwave reactor is 230~250 DEG C.
Step（4）Described in the mass fraction of sodium hydroxide solution be 35~40%, bath temperature is 95~100 DEG C, permanent
The warm reaction time is 60~70min, and the mass fraction of hydrochloric acid is 7~10%, and the mass fraction of hydrogen peroxide is 25~30%, in baking oven
Temperature be 45~50 DEG C, drying time be 2~3h.
Step（5）Described in extruder in extrusion temperature be 200~220 DEG C.
The method have the benefit that：
（1）The present invention is using cornstarch and potato starch as raw material, with being impregnated again with organosilan after salt acid soak, and filters
Microwave high-temperature processing is carried out, is ground up, sieved to obtain sieving after processing, then using shrimp shell as raw material, is successively soaked with lye and acid solution
Bubble uses hydrogen peroxide dipping, reaction product is made after dry after immersion, finally by reaction product, sieving and PP GRANULES with
And the mixing of other auxiliary agents is put into extruder, extrusion is placed on chilling roller surface and takes off epiphragma up to high temperature resistant anti-pollution, the present invention with
Cornstarch and potato starch are that raw material hydrolyzes in an acidic solution and carries out high-temperature process, also using organosilane-modified,
Hydrolysis using hydrochloric acid to starch after high temperature process, makes moisture in starch from starch so that the carbochain chain rupture in starch
It is precipitated in microstructure network, so that starch molecule be enable to merge to form longer carbochain or spacial framework more again
Greatly, more complicated aggregate, to reinforce the high temperature resistance and stability of starch granules, while using organosilan to shallow lake
Powder is modified, and is introduced a large amount of Si-O key and Si-C key, is further strengthened the high temperature resistance of starch molecule, to improve
Take off the heat resistance of epiphragma；
（2）The present invention is using shrimp shell as raw material, and respectively in acid condition and hydrolyzed under basic conditions, chitosan can be destroyed in microorganism
Charge environment, there is good antibacterial effect, improve antifouling property, while itself is rich in hydroxyl, amino and other epoxies
Group, these groups can generate covalent bond absorption with the other molecules taken off in epiphragma, thus the polymer matrix being plasticized needed for making
Body can be more prone to produce bond effect, make to take off the plasticization effect enhancing in epiphragma, while modification of the silane coupling agent to starch
Introducing plurality of stable functional group in starch is set to be allowed to that covalent bond, hydrogen bond and the absorption of other Chemical bondings is more readily formed, from
And enhance plasticization effect, and organosilan can make to take off epiphragma and be insoluble in water and grease to enhance stain resistance, have wide
Wealthy application prospect.
Specific embodiment
By etc. quality cornstarch and potato starch mix be laid on beaker bottom, beaker is put into vacuum oven
In, vacuum oven is evacuated to 90~100Pa, and be warming up to 110~120 DEG C, 30~40min of isothermal reaction is made mixed
Close powder；By above-mentioned mixed-powder and distilled water in mass ratio 2:In 3 investment beakers, beaker is put into ultrasonic vibration instrument, with
Mixing suspension is made after shaking 4~6h in the frequency ultrasound of 35~40kHz, be added dropwise into mixing suspension mass fraction be 4~
7% salt acid for adjusting pH value is filtered after 60~70min is mixed with the revolving speed of 300~350r/min to 3.0~4.0
Slag is put into baking oven after filter residue is washed with distilled water 3~5 times, dry 10~12h under conditions of temperature is 50~60 DEG C,
Obtain desciccate；By above-mentioned desciccate and vinyltrimethoxysilane in mass ratio 1：2 are stirred in investment beaker,
It places the beaker in the water-bath that bath temperature is 60~70 DEG C, 30~40min of heated at constant temperature is filtered after heating
Cake is put into microwave reactor, the item for being 230~250 DEG C in temperature with dehydrated alcohol and after distilling water washing filter cake 3~5 times
50~70min is calcined under part, is put into grinder and grinds after calcining, is crossed 300 meshes and is obtained sieving, it is spare；Weigh 600~
800g shrimp shell, which is put into grinder, grinds, and is impregnated after grinding with the sodium hydroxide solution that mass fraction is 35~40%, and in water-bath
60~70min of isothermal reaction under the water bath condition that temperature is 95~100 DEG C, is obtained by filtration alkaline filter residue, and alkaline filter residue is steamed
Distilled water uses mass fraction after cleaning 4~8 times be 7~10% salt acid dip, is stirred with blender with the revolving speed of 600~800r/min
18~20h is mixed, acid slag is obtained by filtration after stirring, is with mass fraction after acid slag 4~8 times wash with distilled water
25~30% dioxygen 40~50min of water retting, is obtained by filtration oxidation filter residue, and oxidation filter residue is put into baking oven, is 45 in temperature
Reaction product is made in dry 2~3h in~50 DEG C of baking oven；According to parts by weight, by above-mentioned 5~7 parts of reaction products, 4~6 parts
Spare sieving, 35~40 parts of PP GRANULESs, 2~3 parts of polyethylene and 1.0~1.5 parts of oleamides are placed in three-dimensional blending
It mixes in machine, is put into extruder after mixing, squeezed out under conditions of temperature is 200~220 DEG C, and be laid on chilling roller surface,
Epiphragma is taken off up to high temperature resistant anti-pollution.
Example 1
By etc. quality cornstarch and potato starch mix be laid on beaker bottom, beaker is put into vacuum oven, will
Vacuum oven is evacuated to 90Pa, and is warming up to 110 DEG C, isothermal reaction 30min, and mixed-powder is made；By above-mentioned mixed powder
End and distilled water in mass ratio 2:In 3 investment beakers, beaker is put into ultrasonic vibration instrument, is shaken with the frequency ultrasound of 35kHz
Mixing suspension is made after 4h, it is 4% salt acid for adjusting pH value to 3.0 that mass fraction is added dropwise into mixing suspension, with 300r/
Suction filtration obtains filter residue after 60min is mixed in the revolving speed of min, after filter residue is washed with distilled water 3 times, is put into baking oven, in temperature
Degree dry 10h under conditions of being 50 DEG C, obtains desciccate；Above-mentioned desciccate and vinyltrimethoxysilane are pressed into quality
Than 1：2 are stirred in investment beaker, place the beaker in the water-bath that bath temperature is 60 DEG C, heated at constant temperature 30min, heating
After filter obtain filter cake, with dehydrated alcohol and distillation water washing filter cake 3 times after be put into microwave reactor, be in temperature
50min is calcined under conditions of 230 DEG C, is put into grinder and grinds after calcining, is crossed 300 meshes and is obtained sieving, it is spare；It weighs
600g shrimp shell, which is put into grinder, grinds, and is impregnated after grinding with the sodium hydroxide solution that mass fraction is 35%, and in bath temperature
For isothermal reaction 60min under 95 DEG C of water bath conditions, alkaline filter residue is obtained by filtration, after alkaline filter residue wash with distilled water 4 times
The salt acid dip for being 7% with mass fraction is stirred 18h with blender with the revolving speed of 600r/min, is obtained by filtration after stirring
Acid slag, the dioxygen water retting 40min for being wash with distilled water 25% with mass fraction after acid slag 4 times, is obtained by filtration oxygen
Change filter residue, oxidation filter residue is put into baking oven, reaction product is made in dry 2h in the baking oven that temperature is 45 DEG C；In parts by weight
Meter, by above-mentioned 5 parts of reaction products, 4 parts of spare sievings, 35 parts of PP GRANULESs, 2 parts of polyethylene and 1.0 parts of oleamides
It is placed in three-dimensional blender and mixing, is put into extruder after mixing, is squeezed out under conditions of temperature is 200 DEG C, and be laid on chilling
Roller surface takes off epiphragma to get high temperature resistant anti-pollution.
Example 2
By etc. quality cornstarch and potato starch mix be laid on beaker bottom, beaker is put into vacuum oven, will
Vacuum oven is evacuated to 95Pa, and is warming up to 115 DEG C, isothermal reaction 35min, and mixed-powder is made；By above-mentioned mixed powder
End and distilled water in mass ratio 2:In 3 investment beakers, beaker is put into ultrasonic vibration instrument, is shaken with the frequency ultrasound of 37kHz
Mixing suspension is made after 5h, it is 5% salt acid for adjusting pH value to 3.0 that mass fraction is added dropwise into mixing suspension, with 320r/
Suction filtration obtains filter residue after 65min is mixed in the revolving speed of min, after filter residue is washed with distilled water 4 times, is put into baking oven, in temperature
Degree dry 11h under conditions of being 55 DEG C, obtains desciccate；Above-mentioned desciccate and vinyltrimethoxysilane are pressed into quality
Than 1：2 are stirred in investment beaker, place the beaker in the water-bath that bath temperature is 65 DEG C, heated at constant temperature 35min, heating
After filter obtain filter cake, with dehydrated alcohol and distillation water washing filter cake 4 times after be put into microwave reactor, be in temperature
60min is calcined under conditions of 240 DEG C, is put into grinder and grinds after calcining, is crossed 300 meshes and is obtained sieving, it is spare；It weighs
700g shrimp shell, which is put into grinder, grinds, and is impregnated after grinding with the sodium hydroxide solution that mass fraction is 37%, and in bath temperature
For isothermal reaction 65min under 97 DEG C of water bath conditions, alkaline filter residue is obtained by filtration, after alkaline filter residue wash with distilled water 6 times
The salt acid dip for being 8% with mass fraction is stirred 19h with blender with the revolving speed of 700r/min, is obtained by filtration after stirring
Acid slag, the dioxygen water retting 45min for being wash with distilled water 27% with mass fraction after acid slag 6 times, is obtained by filtration oxygen
Change filter residue, oxidation filter residue is put into baking oven, reaction product is made in dry 2.5h in the baking oven that temperature is 47 DEG C；By weight
Number meter, by above-mentioned 6 parts of reaction products, 5 parts of spare sievings, 37 parts of PP GRANULESs, 2 parts of polyethylene and 1.2 parts of oleic acid acyls
Amine is placed in three-dimensional blender and mixing, puts into extruder after mixing, squeezes out under conditions of temperature is 210 DEG C, and be laid on urgency
Epiphragma is taken off to get high temperature resistant anti-pollution in chilling roller surface.
Example 3
By etc. quality cornstarch and potato starch mix be laid on beaker bottom, beaker is put into vacuum oven, will
Vacuum oven is evacuated to 100Pa, and is warming up to 120 DEG C, isothermal reaction 40min, and mixed-powder is made；By above-mentioned mixed powder
End and distilled water in mass ratio 2:In 3 investment beakers, beaker is put into ultrasonic vibration instrument, is shaken with the frequency ultrasound of 40kHz
Mixing suspension is made after 6h, it is 7% salt acid for adjusting pH value to 4.0 that mass fraction is added dropwise into mixing suspension, with 350r/
Suction filtration obtains filter residue after 70min is mixed in the revolving speed of min, after filter residue is washed with distilled water 5 times, is put into baking oven, in temperature
Degree dry 12h under conditions of being 60 DEG C, obtains desciccate；Above-mentioned desciccate and vinyltrimethoxysilane are pressed into quality
Than 1：2 are stirred in investment beaker, place the beaker in the water-bath that bath temperature is 70 DEG C, heated at constant temperature 40min, heating
After filter obtain filter cake, with dehydrated alcohol and distillation water washing filter cake 5 times after be put into microwave reactor, be in temperature
70min is calcined under conditions of 250 DEG C, is put into grinder and grinds after calcining, is crossed 300 meshes and is obtained sieving, it is spare；It weighs
800g shrimp shell, which is put into grinder, grinds, and is impregnated after grinding with the sodium hydroxide solution that mass fraction is 40%, and in bath temperature
For isothermal reaction 70min under 100 DEG C of water bath conditions, alkaline filter residue is obtained by filtration, after alkaline filter residue wash with distilled water 8 times
The salt acid dip for being 10% with mass fraction is stirred 20h with blender with the revolving speed of 800r/min, is obtained by filtration after stirring
Acid slag, the dioxygen water retting 50min for being wash with distilled water 30% with mass fraction after acid slag 8 times, is obtained by filtration oxygen
Change filter residue, oxidation filter residue is put into baking oven, reaction product is made in dry 3h in the baking oven that temperature is 50 DEG C；In parts by weight
Meter, by above-mentioned 7 parts of reaction products, 6 parts of spare sievings, 40 parts of PP GRANULESs, 3 parts of polyethylene and 1.5 parts of oleamides
It is placed in three-dimensional blender and mixing, is put into extruder after mixing, is squeezed out under conditions of temperature is 220 DEG C, and be laid on chilling
Roller surface takes off epiphragma to get high temperature resistant anti-pollution.
Comparative example
Epiphragma is taken off with the high temperature resistant anti-pollution that Wenzhou company produces, and lid is taken off to high temperature resistant anti-pollution produced by the present invention as a comparison case
High temperature resistant anti-pollution in film and comparative example takes off epiphragma and carries out performance detection, and testing result is as shown in table 1：
Test method：
Tolerable temperature test：Epiphragma of taking off in example 1~3 and comparative example is used in Yoghourt packaging, high temperature is placed on and kills
The temperature for respectively taking off epiphragma in no layering, removing, breakage, as its tolerable temperature are measured in bacterium machine, after 45min.
The test of Escherichia coli sterilizing rate is detected by the regulation of JC/T897-2002.
The test of staphylococcus aureus sterilizing rate is detected by the regulation of JC/T897-2002.
Heat seal strength test is detected using the plastics packed heat seal strength test method of QB/T 2358.
OTR oxygen transmission rate test in relative humidity 70%, 23 DEG C × for 24 hours under conditions of test the transmitance of oxygen.
Moisture-vapor transmission test in relative humidity 90%, 38 DEG C × for 24 hours under conditions of test the transmitance of vapor.
Table 1 takes off epiphragma performance measurement result
The high temperature that epiphragma is resistant to 135 DEG C × 45min is taken off according to the high temperature resistant anti-pollution produced by the present invention of data in upper table
Sterilization, sterilizing rate is high, can be very good to carry out sterilizing, i.e. pollution resistance is good, and existing without layering, removing, breakage etc. after sterilization
As heat seal strength is 18~20N/15mm, and heat seal strength is moderate, fluctuation < 2N/15mm is removed when opening, feel smoothly pause by nothing
Sense is frustrated, is easily peeled off, sealing is secured, OTR oxygen transmission rate≤4 mL/m2, moisture-vapor transmission≤2g/m2, barrier with higher
Performance has broad application prospects.
Claims (6)
1. the preparation method that a kind of high temperature resistant anti-pollution takes off epiphragma, it is characterised in that specifically preparation step is：
（1）By etc. quality cornstarch and potato starch mix be laid on beaker bottom, beaker is put into vacuum oven,
Heating is vacuumized, mixed-powder is made in isothermal reaction；
（2）By above-mentioned mixed-powder and distilled water in mass ratio 2:In 3 investment beakers, beaker is put into ultrasonic vibration instrument ultrasonic
Mixing suspension is made in concussion after concussion, salt acid for adjusting pH value is added dropwise into mixing suspension to 3.0~4.0, after mixing
Suction filtration obtains filter residue, after filter residue is washed with distilled water 3~5 times, is placed in oven and dried, obtains desciccate；
（3）By above-mentioned desciccate and vinyltrimethoxysilane in mass ratio 1：2 are stirred in investment beaker, by beaker
It is placed in heated at constant temperature in water-bath, is filtered after heating and obtains filter cake, with dehydrated alcohol and distillation water washing filter cake 3~5 times
After be put into microwave reactor 50~70min of calcining, be put into grinder and grind after calcining, cross 300 meshes and obtain sieving, it is standby
With；
（4）It weighs 600~800g shrimp shell and is put into grinder and grind, impregnated after grinding with sodium hydroxide solution, and in water-bath item
Alkaline filter residue is obtained by filtration in isothermal reaction under part, salt acid dip will be used after alkaline filter residue wash with distilled water 4~8 times, with stirring
Device stirs 18~20h with the revolving speed of 600~800r/min, and acid slag is obtained by filtration after stirring, sour wash with distilled water
Property filter residue 4~8 times after use 40~50min of dioxygen water retting, oxidation filter residue is obtained by filtration, will oxidation filter residue be placed in oven and dried
Reaction product is made；
（5）According to parts by weight, by above-mentioned 5~7 parts of reaction products, 4~6 parts of spare sievings, 35~40 parts of polypropylene
Grain, 2~3 parts of polyethylene and 1.0~1.5 parts of oleamides are placed in three-dimensional blender and mixing, put into extruder and squeeze after mixing
Out, it and is laid on chilling roller surface and takes off epiphragma to get high temperature resistant anti-pollution.
2. the preparation method that a kind of high temperature resistant anti-pollution according to claim 1 takes off epiphragma, it is characterised in that：Step（1）In
It is 90~100Pa that the vacuum oven, which is evacuated to vacuum degree, and warming temperature to 110~120 DEG C, isothermal reaction time is
30~40min.
3. the preparation method that a kind of high temperature resistant anti-pollution according to claim 1 takes off epiphragma, it is characterised in that：Step（2）In
Frequency in the ultrasonic vibration instrument is 35~40kHz, and the ultrasonic vibration time is 4~6h, the mass fraction of hydrochloric acid is 4~
7%, speed of agitator is 300~350r/min, and mixing time is 60~70min, and the temperature in baking oven is 50~60 DEG C, is done
The dry time is 10~12h.
4. the preparation method that a kind of high temperature resistant anti-pollution according to claim 1 takes off epiphragma, it is characterised in that：Step（3）In
Bath temperature in the water-bath is 60~70 DEG C, and the heated at constant temperature time is 30~40min, the temperature in microwave reactor
It is 230~250 DEG C.
5. the preparation method that a kind of high temperature resistant anti-pollution according to claim 1 takes off epiphragma, it is characterised in that：Step（4）In
The mass fraction of the sodium hydroxide solution be 35~40%, bath temperature be 95~100 DEG C, the isothermal reaction time be 60~
70min, the mass fraction of hydrochloric acid are 7~10%, and the mass fraction of hydrogen peroxide is 25~30%, and the temperature in baking oven is 45~50
DEG C, drying time is 2~3h.
6. the preparation method that a kind of high temperature resistant anti-pollution according to claim 1 takes off epiphragma, it is characterised in that：Step（5）In
Extrusion temperature in the extruder is 200~220 DEG C.
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