CN109232999A - A kind of preparation process of the degradable package material based on bio-matrix - Google Patents
A kind of preparation process of the degradable package material based on bio-matrix Download PDFInfo
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
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- C08J2405/00—Characterised by the use of polysaccharides or of their derivatives not provided for in groups C08J2401/00 or C08J2403/00
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Abstract
The preparation process of the invention discloses a kind of degradable package material based on bio-matrix, specific preparation process are as follows: the first step configures starch fluid；Second step prepares modified starch liquid；Third step prepares modified gelatinized starch liquid；4th step prepares the starch glue of paste；5th step, the paste starch glue deaeration under vacuum that will be prepared in the 4th step, is poured into container, is then dried and is formed a film by the tape casting；6th step cuts sealing, packaging bag is made after removing the film of preparation.Packaging material tensile strength prepared by the present invention reaches 39.57MPa, the elongation at break of packaging material reaches 156.7% simultaneously, it can be used for various packagings, and it can reach 92.3% degradation rate after degrading 30 days in the medium, realize the fast degradation of packaging bag, and the problem of packaging bag, still without leakage, it is still lower to solve the anti-drawing ability of stretching of traditional modified starch packaging material when being packed into water and oil 10 days, while impermeabilisation ability reduces when using the long period.
Description
Technical field
The invention belongs to packaging material fields, are related to a kind of preparation work of degradable package material based on bio-matrix
Skill.
Background technique
Packaging bag is since its convenience obtains everybody be widely used, and traditional packaging bag is in order to realize antiseep, anti-stretch
Drawing uses polythene material, but polythene material is difficult to degrade, and causes the pollution of environment.
Degradation material is by extensive concern in recent years, wherein the most widely used packaging material for belonging to starch conversion, no
It only can be realized degradability, while edible pollution-free, but the packaging material of starch preparation is anti-that to stretch drawing ability weak, and is easy
Infiltration can only be used to the edible article of packaged confectionary class, be then unable to meet demand for big packaging bag, lead in existing technology
Addition reinforcing agent is crossed to be modified starch, the hydroxyl in reinforcing agent and the hydroxyl in starch by intermolecular force in conjunction with,
It can be realized the stabilization of starch molecule, and then can be improved the anti-of starch and stretch drawing row, but anti-drawing ability of stretching is still lower, simultaneously
Impermeabilisation ability reduces when using the long period.
Summary of the invention
The preparation process of the purpose of the present invention is to provide a kind of degradable package material based on bio-matrix, preparation
Packaging material tensile strength reaches 39.57MPa, while the elongation at break of packaging material reaches 156.7%, can be used for each
Kind packaging, and can reach 92.3% degradation rate after degrading 30 days in the medium, realize the fast degradation of packaging bag, and
Packaging bag when being packed into water and oil 10 days still without leakage, solve traditional modified starch packaging material it is anti-stretch drawing ability still compared with
The problem of low, while impermeabilisation ability reduces when using the long period.
The Amino End Group of the modified starch chain branch end of the chain of the present invention is crosslinked by the amino of formaldehyde and chitosan, so that entire starch
Chain is cross-linked into reticular structure, so that it is fixed between starch molecular chain, and then the mobility of starch molecule is reduced, so that after crosslinking
Packaging material obtained by starch is anti-to stretch tensile strength raising, since entire molecule reticulates Structural assignments, so that preparation
The enhancing of film flexibility, while by the hydroxyl in starch by after complexing, three isopropyl ester of aluminic acid is plugged in by complexing
Between starch molecular chain after crosslinking, make the starch molecule internal structure after being crosslinked more stable by chemical bond, so that
The packaging material of preparation is anti-to be stretched tensile strength and further increases, and solves traditional starch conversion simply by introducing hydroxyl functional base
Group by connecting between the hydroxyl in hydroxyl and modified starch by intermolecular force, and then reduces the mobility of starch, but
It is intermolecular force compared with crosslinked action, active force is weaker, and still contains hydrophilic radical hydroxyl in the starch after crosslinking,
So that starch preparation film still have certain hydrophily, in turn result in film preparation packaging material infiltration the problem of.
The hydroxyl in three isopropyl ester of aluminic acid and crosslinked starch molecule that the present invention is added during starch conversion is complexed, by
Three isopropyl ester of aluminic acid forms trigonal bipyramid structure after complexing, has hydrophobicity, so that entire netted modified starch intramolecule
With hydrophobicity, and since chitosan inherently has certain hydrophobicity, so that the mesh skeleton knot of modified starch molecule
Certain hydrophobicity is all had inside structure and reticular structure, so that with higher hydrophobic by packaging material prepared by modified starch
Ability can effectively prevent the infiltration of packaging material.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of preparation process of the degradable package material based on bio-matrix, specific preparation process are as follows:
The first step takes a certain amount of cornstarch to be added in the aqueous solution that temperature is 50-60 DEG C, stirring 30-40min mixing
After uniformly, starch fluid is obtained；Amylose in cornstarch is dissolved in hot water, and amylopectin is then partially soluble in hot water；
Every gram of cornstarch is added in 17-18mL water；
Epoxychloropropane is added into starch fluid for second step, adjusts the temperature to 60 DEG C, while passing through sodium hydroxide solution tune
The pH value for saving solution is pH=9, is warming up to 70 DEG C of reaction 2h after being stirred to react 4h, urea is then added thereto, constant temperature is anti-
2-3h is answered, modified starch liquid is obtained, reaction equation is as follows, itself contains a large amount of hydroxyl in the cyclic structure of starch, passes through
Urea is then added so that introducing epoxy group on starch chain with epichlorohydrin reaction chlorination, passes through the two of urea
The amino at end carries out ring-opening reaction with epoxy group, so that the branch end of the chain leading-in end amino of modified starch chain, while epoxy group
Hydroxyl is generated when group's open loop；Epoxychloropropane 60-65mL is added in every liter of starch solution, urea 23-27g is added；
The modified starch liquid of preparation is put into reaction vessel, is stirred to react 20-30min at 90-95 DEG C by third step,
Obtain modified gelatinized starch liquid；The amylopectin by undissolved reaction is gelatinized at this time, so that entire modified starch liquid is viscous
It ties performance to improve, so that hydrone is able to maintain biggish activity, so that the tensile strength and fracture of the starch film of preparation
Elongation improves；
4th step takes a certain amount of chitosan to be dissolved in acetic acid, and three isopropyl ester of aluminic acid is added thereto, adds after stirring and dissolving
Enter in modified gelatinized starch liquid, be warming up to 60-70 DEG C, formaldehyde is then slowly added dropwise thereto, be vigorously stirred when being added dropwise, is added dropwise
Constant temperature is stirred to react 3-4h after completely, obtains the starch glue of paste, specific reaction structure formula is as follows, wherein every gram of chitosan is molten
In 10-12mL acetic acid, three isopropyl ester 780-800mg of aluminic acid is added in every gram of chitosan；Shell is added in every liter of modified starch liquid
Formaldehyde 140-150mL is added in glycan 80-85g；The Amino End Group of the modified starch chain branch end of the chain is handed over by the amino of formaldehyde and chitosan
Connection, so that entire starch chain is cross-linked into reticular structure, so that it is fixed between starch molecular chain, and then reduce the flowing of starch molecule
Property so that crosslinking after starch obtained by film mechanical strength improve；Since entire molecule reticulates Structural assignments, so that
The film flexibility of preparation enhances；Hydroxyl is generated when epoxy group open loop simultaneously, and starch chain itself contains great amount of hydroxy group, hydroxyl
Complexing occurs between three isopropyl ester of aluminic acid, aluminium is with sp3D orbital hybridization forms trigonal bipyramid structure, makes it by hydrophily
Become hydrophobicity, while by the hydroxyl in starch by after complexing, three isopropyl ester of aluminic acid is plugged in friendship by complexing
Between starch molecular chain after connection, make the starch molecule internal structure after being crosslinked more stable by chemical bond, so that handing over
Film mechanical strength obtained by starch after connection further increases, and traditional starch conversion is simply by introducing hydroxyl functional base
Group by connecting between the hydroxyl in hydroxyl and modified starch by intermolecular force, and then reduces the mobility of starch, but
It is intermolecular force compared with crosslinked action, active force is weaker, and still contains hydrophilic radical hydroxyl in the starch after crosslinking,
So that the film of starch preparation still has certain hydrophily, the packaging material infiltration of film preparation is in turn resulted in, and the present invention is in starch
The hydroxyl in three isopropyl ester of aluminic acid and crosslinked starch molecule being added in modifying process is complexed, due to three isopropyl ester of aluminic acid after complexing
Trigonal bipyramid structure is formed, there is hydrophobicity, so that entire netted modified starch intramolecule has hydrophobicity, and due to shell
Glycan inherently has certain hydrophobicity, so that all having inside the mesh skeleton structure and reticular structure of modified starch molecule
Certain hydrophobicity, so that the packaging material hydrophobic ability with higher prepared by modified starch, can effectively prevent from wrapping
The infiltration of package material；
Wherein
5th step, the paste starch glue deaeration under vacuum that will be prepared in the 4th step, pours into container, then passes through stream
Prolong method drying film forming；
6th step cuts sealing, packaging bag is made after removing the film of preparation.
Beneficial effects of the present invention:
Packaging material tensile strength of the invention reaches 39.57MPa, while the elongation at break of packaging material reaches
156.7%, it can be used for various packagings, and can reach 92.3% degradation rate after degrading 30 days in the medium, realize packet
The fast degradation of pack, and packaging bag when being packed into water and oil 10 days still without leakage, solve traditional modified starch packaging
The problem of anti-drawing ability of stretching of material is still lower, while impermeabilisation ability reduces when using the long period.
The Amino End Group of the modified starch chain branch end of the chain of the present invention is crosslinked by the amino of formaldehyde and chitosan, so that entire starch
Chain is cross-linked into reticular structure, so that it is fixed between starch molecular chain, and then the mobility of starch molecule is reduced, so that after crosslinking
Packaging material obtained by starch is anti-to stretch tensile strength raising, since entire molecule reticulates Structural assignments, so that preparation
The enhancing of film flexibility, while by the hydroxyl in starch by after complexing, three isopropyl ester of aluminic acid is plugged in by complexing
Between starch molecular chain after crosslinking, make the starch molecule internal structure after being crosslinked more stable by chemical bond, so that
The packaging material of preparation is anti-to be stretched tensile strength and further increases, and solves traditional starch conversion simply by introducing hydroxyl functional base
Group by connecting between the hydroxyl in hydroxyl and modified starch by intermolecular force, and then reduces the mobility of starch, but
It is intermolecular force compared with crosslinked action, active force is weaker, and still contains hydrophilic radical hydroxyl in the starch after crosslinking,
So that starch preparation film still have certain hydrophily, in turn result in film preparation packaging material infiltration the problem of.
The hydroxyl in three isopropyl ester of aluminic acid and crosslinked starch molecule that the present invention is added during starch conversion is complexed, by
Three isopropyl ester of aluminic acid forms trigonal bipyramid structure after complexing, has hydrophobicity, so that entire netted modified starch intramolecule
With hydrophobicity, and since chitosan inherently has certain hydrophobicity, so that the mesh skeleton knot of modified starch molecule
Certain hydrophobicity is all had inside structure and reticular structure, so that with higher hydrophobic by packaging material prepared by modified starch
Ability can effectively prevent the infiltration of packaging material.
Detailed description of the invention
In order to facilitate the understanding of those skilled in the art, the present invention will be further described below with reference to the drawings.
Fig. 1 is degradable package material synthesis processes structural schematic diagram of the present invention；
Fig. 2 is the local molecular structure schematic diagram in Fig. 1.
Specific embodiment
It is described in detail in conjunction with Fig. 1 and Fig. 2 by embodiment and comparative example；
Embodiment 1:
A kind of preparation process of the degradable package material based on bio-matrix, specific preparation process are as follows:
The first step takes 1kg cornstarch to be added in the aqueous solution that 17L temperature is 50-60 DEG C, and stirring 30-40min mixing is equal
After even, starch fluid is obtained；
60mL epoxychloropropane is added into 1L starch fluid, adjusts the temperature to 60 DEG C, while passing through sodium hydroxide for second step
The pH value that solution adjusts solution is pH=9, is warming up to 70 DEG C of reaction 2h after being stirred to react 4h, and 23g urine is then added thereto
Element, isothermal reaction 2-3h obtain modified starch liquid；
The modified starch liquid of preparation is put into reaction vessel, is stirred to react 20-30min at 90-95 DEG C by third step,
Obtain modified gelatinized starch liquid；
4th step takes 80g chitosan to be dissolved in 800mL acetic acid, and three isopropyl ester of 62.4g aluminic acid is added thereto, stirs molten
It is added in 1L modified starch liquid after solution, is warming up to 60-70 DEG C, 140mL formaldehyde is then slowly added dropwise thereto, it is violent when being added dropwise
Stirring, constant temperature is stirred to react 3-4h after being added dropwise completely, obtains the starch glue of paste；
5th step, the paste starch glue deaeration under vacuum that will be prepared in the 4th step, pours into container, then passes through stream
Prolong method drying film forming；
6th step cuts sealing, packaging bag is made after removing the film of preparation.
Embodiment 2:
A kind of preparation process of the degradable package material based on bio-matrix, specific preparation process are as follows:
The first step takes 1kg cornstarch to be added in the aqueous solution that 18L temperature is 50-60 DEG C, and stirring 30-40min mixing is equal
After even, starch fluid is obtained；
65mL epoxychloropropane is added into 1L starch fluid, adjusts the temperature to 60 DEG C, while passing through sodium hydroxide for second step
The pH value that solution adjusts solution is pH=9, is warming up to 70 DEG C of reaction 2h after being stirred to react 4h, and 27g urine is then added thereto
Element, isothermal reaction 2-3h obtain modified starch liquid；
The modified starch liquid of preparation is put into reaction vessel, is stirred to react 20-30min at 90-95 DEG C by third step,
Obtain modified gelatinized starch liquid；
4th step takes 85g chitosan to be dissolved in 960mL acetic acid, and three isopropyl ester of 68g aluminic acid, stirring and dissolving are added thereto
It is added in 1L modified starch liquid afterwards, is warming up to 60-70 DEG C, 150mL formaldehyde is then slowly added dropwise thereto, acutely stirred when being added dropwise
It mixes, constant temperature is stirred to react 3-4h after being added dropwise completely, obtains the starch glue of paste；
5th step, the paste starch glue deaeration under vacuum that will be prepared in the 4th step, pours into container, then passes through stream
Prolong method drying film forming；
6th step cuts sealing, packaging bag is made after removing the film of preparation.
Comparative example 1:
A kind of preparation process of the degradable package material based on bio-matrix, specific preparation process are as follows:
The first step takes 1kg cornstarch to be added in the aqueous solution that 17L temperature is 50-60 DEG C, and stirring 30-40min mixing is equal
After even, starch fluid is obtained；
The starch fluid of preparation is put into reaction vessel by second step, is stirred to react 20-30min at 90-95 DEG C, is obtained
Gelatinized starch liquid；
Third step, the gelatinized starch liquid deaeration under vacuum that will be prepared in second step, pours into container, then passes through curtain coating
Method drying film forming；
4th step cuts sealing, packaging bag is made after removing the film of the preparation of preparation.
Comparative example 2:
A kind of preparation process of the degradable package material based on bio-matrix, specific preparation process are as follows:
The first step takes 1kg cornstarch to be added in the aqueous solution that 17L temperature is 50-60 DEG C, and stirring 30-40min mixing is equal
After even, starch fluid is obtained；
60mL epoxychloropropane is added into 1L starch fluid, adjusts the temperature to 60 DEG C, while passing through sodium hydroxide for second step
The pH value that solution adjusts solution is pH=9, is warming up to 70 DEG C of reaction 2h after being stirred to react 4h, and 23g urine is then added thereto
Element, isothermal reaction 2-3h obtain modified starch liquid；
The modified starch liquid of preparation is put into reaction vessel, is stirred to react 20-30min at 90-95 DEG C by third step,
Obtain modified gelatinized starch liquid；
4th step, the modification gelatinized starch liquid deaeration under vacuum that will be prepared in third step, pours into container, then passes through
The tape casting drying film forming；
5th step cuts sealing, packaging bag is made after removing the film of preparation.
Comparative example 3:
A kind of preparation process of the degradable package material based on bio-matrix, specific preparation process are as follows:
The first step takes 1kg cornstarch to be added in the aqueous solution that 17L temperature is 50-60 DEG C, and stirring 30-40min mixing is equal
After even, starch fluid is obtained；
Starch fluid is put into reaction vessel by second step, is stirred to react 20-30min at 90-95 DEG C, is obtained gelatinization and is formed sediment
Powder liquid；
60mL epoxychloropropane is added into 1L gelatinized starch liquid, adjusts the temperature to 60 DEG C, while passing through hydrogen-oxygen for 4th step
Changing sodium solution to adjust the pH value of solution is pH=9, is warming up to 70 DEG C of reaction 2h after being stirred to react 4h, is then added thereto
23g urea, isothermal reaction 2-3h obtain modified gelatinized starch liquid；
4th step takes 80g chitosan to be dissolved in 800mL acetic acid, and three isopropyl ester of 62.4g aluminic acid is added thereto, stirs molten
It is added after solution in the modified gelatinized starch liquid of 1L, is warming up to 60-70 DEG C, 140mL formaldehyde is then slowly added dropwise thereto, when being added dropwise
It is vigorously stirred, constant temperature is stirred to react 3-4h after being added dropwise completely, obtains the starch glue of paste；
5th step, the paste starch glue deaeration under vacuum that will be prepared in the 4th step, pours into container, then passes through stream
Prolong method drying film forming；
6th step cuts sealing, packaging bag is made after removing the film of preparation.
Comparative example 4:
A kind of preparation process of the degradable package material based on bio-matrix, specific preparation process are as follows:
The first step takes 1kg cornstarch to be added in the aqueous solution that 17L temperature is 50-60 DEG C, and stirring 30-40min mixing is equal
After even, starch fluid is obtained；
Starch fluid is put into reaction vessel by second step, is stirred to react 20-30min at 90-95 DEG C, is obtained gelatinization and is formed sediment
Powder liquid；
Third step is added glycerol in the gelatinized starch liquid prepared into second step, takes off under vacuum after being uniformly mixed
Bubble, is poured into container, is then dried and is formed a film by the tape casting；
4th step cuts sealing, packaging bag is made after removing the film of preparation.
Embodiment 3
The embodiment 1-2 and comparative example 1-4 packaging bag prepared and existing vinyon packaging bag are subjected to mechanical property
It can test:
The embodiment 1-2 and comparative example 1-4 packaging bag prepared and existing vinyon are packed with tensile testing machine
Bag carries out tensile test respectively, every group sample retest 5 times, take the average value of experimental result, the results are shown in Table 1；
The packaging bag of table 1 embodiment 1-2 and comparative example 1-4 preparation and existing vinyon packaging bag mechanical property are surveyed
Test result
As shown in Table 1, it first passes through amino modified rear and then is gelatinized, crosslinking complexing preparation is then carried out with chitosan
Modified colloidal has mesh skeleton, and complexing occurs between three isopropyl ester of hydroxyl and aluminic acid in mesh skeleton, so that aluminium
Sour three isopropyl esters are plugged between the starch molecular chain after crosslinking, and the starch molecule internal structure after being crosslinked is made by chemical bond
It is more stable, therefore modified colloid is integrally cross-linked into firm skeleton structure, inner complexation connection, so that prepared by the colloid
The tensile strength of packaging material be up to 39.57MPa, intensity almost reaches the strong of the packaging material of pure polyethylene preparation fastly
Degree；And the elongation at break of packaging bag is up to 156.7%；As shown in comparative example 3, stretched when starch, which is first gelatinized, to be modified afterwards strong
Degree and elongation at break decrease compared with the starch of the modified gelatinization of elder generation, due to during starch gelatinization on starch chain primary
Alcohol radical is combined by intermolecular force, so that the starch after gelatinization is carrying out chlorination formula low efficiency with epoxychloropropane,
So that the terminal amino group content of modified starch link ends reduces, so that the cross-link intensity of later period and chitosan reduces, into
And influence the tensile strength and elongation at break of packaging material.
Embodiment 4:
The embodiment 1-2 and comparative example 1-4 packaging bag prepared is subjected to infiltration and oil penetration test:
It will be respectively charged into water and vegetable oil in each group packaging bag of preparation, places 1 day, 5 days and 10 days and then see respectively
The infiltration situation of packaging bag external water and oil is examined, structure is as shown in table 2；
The packaging bag of table 2 embodiment 1-2 and comparative example 1-4 preparation carries out infiltration and oil penetration test result
As shown in Table 2, the hydroxyl network in three isopropyl ester of aluminic acid and crosslinked starch molecule being added during starch conversion
It closes, since three isopropyl ester of aluminic acid forms trigonal bipyramid structure after complexing, there is hydrophobicity and oleophobic property, so that entire netted modification
There is hydrophobicity and oleophobic property, and since chitosan inherently has certain hydrophobicity and oleophobic property inside starch molecule,
So that certain hydrophobicity and oleophobic property are all had inside the mesh skeleton structure and reticular structure of modified starch molecule, so that by
The packaging material hydrophobic oleophobic ability with higher of modified starch preparation, can effectively prevent infiltration and the infiltration of packaging material
Oil.
Embodiment 5:
Packaging bag prepared by embodiment 1-2 and comparative example 1-4 carries out the test of degradation property
1. cultivating the syrup that configuration concentration is 4%, be warming up to 35-40 DEG C, be added distiller's yeast thereto, cultivate 72h, then into
Culture solution is obtained by filtration in row；Wherein contain the microorganisms such as mould, lactic acid bacteria, bacillus subtilis in culture solution；Mould and gemma
Bacillus can secreting amylase, amylase can be achieved at the same time degradation while to starch chain in packaging material and chitosan chain；
2. the fritter that the embodiment 1-2 and comparative example 1-4 packaging bag prepared is cut into 5cm × 3cm is respectively put into training
In nutrient solution, at the same weigh be put into before the quality of each sample be calculated as m1；
3. each sample is placed respectively in culture solution 5 days, 10 days, 15 days, 20 days and 30 days, placement is weighed respectively not
M is calculated as with the quality after number of days to laboratory sample2；
4. calculating weight-loss ratio=(m of a sample after degradation different number of days1-m2)/m1
Weight-loss ratio after the packaging bag sample degradation different number of days of embodiment 1-2 and comparative example 1-4 preparation is as shown in table 3:
Table 3: the weight-loss ratio (%) after various sample degradation different number of days
As shown in Table 3, preferable by the chitosan crosslinked rear packaging material degradation capability prepared, it can reach at 30 days
92.3% degradation rate, while degradation rate is very fast, can degrade 76.1% at 20 days, with full starch packing material almost phase
Together, due to containing the microorganisms such as mould, lactic acid bacteria, bacillus subtilis in culture solution；Mould and bacillus can secrete shallow lake
Powder enzyme, amylase can be achieved at the same time degradation while to starch chain in packaging material and chitosan chain；And then realize chitosan
The starch chain and chitosan chain of crosslinked starch simultaneously switch off, so that mesh skeleton structure disconnects, accelerate degradation efficiency.
Present invention disclosed above preferred embodiment is only intended to help to illustrate the present invention.There is no detailed for preferred embodiment
All details are described, are not limited the invention to the specific embodiments described.Obviously, according to the content of this specification,
It can make many modifications and variations.These embodiments are chosen and specifically described to this specification, is in order to better explain the present invention
Principle and practical application, so that skilled artisan be enable to better understand and utilize the present invention.The present invention is only
It is limited by claims and its full scope and equivalent.
Claims (5)
1. a kind of preparation process of the degradable package material based on bio-matrix, which is characterized in that specific preparation process is as follows:
The first step takes a certain amount of cornstarch to be added in the aqueous solution that temperature is 50-60 DEG C, and stirring 30-40min is uniformly mixed
Afterwards, starch fluid is obtained；
Epoxychloropropane is added into starch fluid for second step, adjusts the temperature to 60 DEG C, while being adjusted by sodium hydroxide solution molten
The pH value of liquid is pH=9, is warming up to 70 DEG C of reaction 2h after being stirred to react 4h, urea, isothermal reaction 2- are then added thereto
3h obtains modified starch liquid；
The modified starch liquid of preparation is put into reaction vessel, is stirred to react 20-30min at 90-95 DEG C, obtains by third step
Modified gelatinized starch liquid；
4th step takes a certain amount of chitosan to be dissolved in acetic acid, and three isopropyl ester of aluminic acid is added thereto, is added and changes after stirring and dissolving
Property gelatinized starch liquid in, be warming up to 60-70 DEG C, formaldehyde be then slowly added dropwise thereto, be vigorously stirred when being added dropwise, is added dropwise complete
Constant temperature is stirred to react 3-4h afterwards, obtains the starch glue of paste；
5th step, the paste starch glue deaeration under vacuum that will be prepared in the 4th step, pours into container, then passes through the tape casting
Drying film forming；
6th step cuts sealing, packaging bag is made after removing the film of preparation.
2. a kind of preparation process of degradable package material based on bio-matrix according to claim 1, feature exist
In every gram of cornstarch is added in 17-18mL water in the first step.
3. a kind of preparation process of degradable package material based on bio-matrix according to claim 1, feature exist
In addition epoxychloropropane 60-65mL in every liter of starch solution, is added urea 23-27g in second step.
4. a kind of preparation process of degradable package material based on bio-matrix according to claim 1, feature exist
In every gram of chitosan is dissolved in 10-12mL acetic acid in the 4th step, and three isopropyl ester 780-800mg of aluminic acid is added in every gram of chitosan；
Chitosan 80-85g is added in every liter of modified starch liquid, formaldehyde 140-150mL is added.
5. a kind of preparation process of degradable package material based on bio-matrix according to claim 1, feature exist
In the tensile strength of the packaging material reaches 39.57MPa, while the elongation at break of packaging material reaches 156.7%.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2018109204500 | 2018-08-14 | ||
| CN201810920450 | 2018-08-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109232999A true CN109232999A (en) | 2019-01-18 |
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| CN201811099082.4A Withdrawn CN109232999A (en) | 2018-08-14 | 2018-09-20 | A kind of preparation process of the degradable package material based on bio-matrix |
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| CN (1) | CN109232999A (en) |
| WO (1) | WO2020034958A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110256586A (en) * | 2019-07-11 | 2019-09-20 | 江南大学 | A kind of degradable epoxy-modified starch and preparation method thereof |
| CN110304960A (en) * | 2019-06-20 | 2019-10-08 | 杨秀丽 | A kind of Post-emergence composite herbicide for corn and its application |
| WO2020034958A1 (en) * | 2018-08-14 | 2020-02-20 | 周璐 | Process for preparing biological substrate-based degradable packaging material |
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Cited By (3)
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| WO2020034958A1 (en) * | 2018-08-14 | 2020-02-20 | 周璐 | Process for preparing biological substrate-based degradable packaging material |
| CN110304960A (en) * | 2019-06-20 | 2019-10-08 | 杨秀丽 | A kind of Post-emergence composite herbicide for corn and its application |
| CN110256586A (en) * | 2019-07-11 | 2019-09-20 | 江南大学 | A kind of degradable epoxy-modified starch and preparation method thereof |
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| Publication number | Publication date |
|---|---|
| WO2020034958A1 (en) | 2020-02-20 |
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Application publication date: 20190118 |