CN106317476A - Production method of corn starch and PVA blended plastic film - Google Patents
Production method of corn starch and PVA blended plastic film Download PDFInfo
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- CN106317476A CN106317476A CN201510342396.2A CN201510342396A CN106317476A CN 106317476 A CN106317476 A CN 106317476A CN 201510342396 A CN201510342396 A CN 201510342396A CN 106317476 A CN106317476 A CN 106317476A
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- corn starch
- starch
- pva
- ethanol solution
- reaction product
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
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Abstract
The invention discloses a production method of a corn starch and PVA blended plastic film. The method comprises the following steps: weighing 20-25 parts of corn starch, fully and uniformly mixing the corn starch with 5-10 parts of sodium hydroxide, transferring the obtained mixture into a reaction kettle, carrying out stirring and an alkalization reaction for 30-60 min, allowing the obtained alkalization reaction product to stand for cooling in order to obtain causterized starch; and fully mixing a 70% ethanol solution with hypochlorous acetic acid crystals, spraying the obtained mixture on the surface of the causterized starch, carrying out an etherification reaction at 60 DEG C for 30-60 min, cooling the obtained etherification reaction product to room temperature, and crushing the cooled etherification reaction product, sieving the crushed etherification reaction product by a 300 mesh sieve in order to obtain carboxy methyl starch (CMS). A cross-linking reaction improves the compatibility and the mechanical performances of the corn starch and the PVA, and addition of a hydrophobic modifier enhances the waterproof performance of the film. The film has very good tensile strength, elongation at break, light transmittance and water absorption rate.
Description
Technical field
The present invention relates to plastic package material field, the preparation method of a kind of corn starch/PVA plastic alloy thin film.
Background technology
Starch is a biodegradable natural polymer of class, has critical role in biodegradation material field.Amylose can be used to make the aqueous film that oxygen transmission rate is low; as after its hydroxypropyl starch film forming, crystallinity is high, it is the highest to combine energy density; so its oxygen transmission rate is lower; the most valuable is that high amylose starches film barrier in the environment of high-temperature also will not decline, and can effectively protect packaged food etc..
Summary of the invention
It is an object of the invention to provide the preparation method of a kind of corn starch/PVA plastic alloy thin film, obtain the plastic sheeting with excellent mechanical performances and degradation property.
The technical scheme is that and be achieved in that: the preparation method of corn starch/PVA plastic alloy thin film,
1) weighing the corn starch of 20-25, be sufficiently mixed after uniformly with the sodium hydroxide of 5-10, proceed in reactor, stirring and quaternization stand cooling after 30-60 minute and obtain the starch that alkalizes；
2), after 70% ethanol solution and time monoxone crystal being sufficiently mixed uniformly, it is sprayed to the surface of alkalization starch, under the conditions of 60 DEG C, is cooled to room temperature after etherification reaction 30-60min, then pulverized 300 mesh sieves, and i.e. obtained carboxymethyl starch CMS；
3) taking carboxymethyl corn starch, be dispersed in equipped with in the ethanol solution of 95%, after being sufficiently stirred for, regulation solution ph is 9-10, is subsequently adding epoxychloropropane, cross-linking reaction 30-45 minute in 50-70 DEG C of water-bath；
4) wash 2 times with the ethanol solution of 70%, sucking filtration, be dried 2h, pulverize and obtain crosslinked carboxymethyl fecula；
5) the tape casting film forming.
After pulverizing, the granularity of crosslinked carboxymethyl fecula is 300 mesh.
The addition of described epoxychloropropane is 2.5-5.5%.
The invention have the benefit that and improve corn starch and the compatibility of PVA and mechanical property by cross-linking reaction
Can, meanwhile, add hydrophobic modification agent and enhance the water resistance of film.The hot strength of film, elongation at break, light transmittance and water absorption rate are the most fine.
Detailed description of the invention
The preparation method of corn starch/PVA plastic alloy thin film:
1) weighing the corn starch of 20-25, be sufficiently mixed after uniformly with the sodium hydroxide of 5-10, proceed in reactor, stirring and quaternization stand cooling after 30-60 minute and obtain the starch that alkalizes；
2), after 70% ethanol solution and time monoxone crystal being sufficiently mixed uniformly, it is sprayed to the surface of alkalization starch, under the conditions of 60 DEG C, is cooled to room temperature after etherification reaction 30-60min, then pulverized 300 mesh sieves, and i.e. obtained carboxymethyl starch CMS；
3) taking carboxymethyl corn starch, be dispersed in equipped with in the ethanol solution of 95%, after being sufficiently stirred for, regulation solution ph is 9-10, is subsequently adding 2.5-5.5% epoxychloropropane, cross-linking reaction 30-45 minute in 50-70 DEG C of water-bath；
4) washing 2 times with the ethanol solution of 70%, sucking filtration, be dried 2h, pulverize and obtain crosslinked carboxymethyl fecula, after pulverizing, the granularity of crosslinked carboxymethyl fecula is 300 mesh；
5) the tape casting film forming.
The above; it is only the present invention preferably detailed description of the invention; but protection scope of the present invention is not limited thereto; any those familiar with the art is in the technical scope of present disclosure; according to technical scheme and inventive concept equivalent or change in addition thereof, all should contain within protection scope of the present invention.
Claims (3)
1. the preparation method of corn starch/PVA plastic alloy thin film, it is characterised in that:
1) weighing the corn starch of 20-25, be sufficiently mixed after uniformly with the sodium hydroxide of 5-10, proceed in reactor, stirring and quaternization stand cooling after 30-60 minute and obtain the starch that alkalizes；
2), after 70% ethanol solution and time monoxone crystal being sufficiently mixed uniformly, it is sprayed to the surface of alkalization starch, under the conditions of 60 DEG C, is cooled to room temperature after etherification reaction 30-60min, then pulverized 300 mesh sieves, and i.e. obtained carboxymethyl starch CMS；
3) taking carboxymethyl corn starch, be dispersed in equipped with in the ethanol solution of 95%, after being sufficiently stirred for, regulation solution ph is 9-10, is subsequently adding epoxychloropropane, cross-linking reaction 30-45 minute in 50-70 DEG C of water-bath；
4) wash 2 times with the ethanol solution of 70%, sucking filtration, be dried 2h, pulverize and obtain crosslinked carboxymethyl fecula；
5) the tape casting film forming.
The preparation method of corn starch/PVA plastic alloy thin film the most according to claim 1, it is characterised in that after pulverizing, the granularity of crosslinked carboxymethyl fecula is 300 mesh.
The preparation method of corn starch/PVA plastic alloy thin film the most according to claim 1, it is characterised in that: the addition of described epoxychloropropane is 2.5-5.5%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510342396.2A CN106317476A (en) | 2015-06-19 | 2015-06-19 | Production method of corn starch and PVA blended plastic film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510342396.2A CN106317476A (en) | 2015-06-19 | 2015-06-19 | Production method of corn starch and PVA blended plastic film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106317476A true CN106317476A (en) | 2017-01-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510342396.2A Pending CN106317476A (en) | 2015-06-19 | 2015-06-19 | Production method of corn starch and PVA blended plastic film |
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| CN (1) | CN106317476A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107815927A (en) * | 2017-09-29 | 2018-03-20 | 当涂县瑞龙果树种植专业合作社 | A kind of Environmental-protection agricultural paper mulch sheet with enhanced water resistance energy and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101899173A (en) * | 2010-07-16 | 2010-12-01 | 山东农业大学 | Edible starch-based food packaging film and preparation method thereof |
| CN104356428A (en) * | 2014-11-12 | 2015-02-18 | 山东农业大学 | Starch nanocomposite film and preparation method thereof |
-
2015
- 2015-06-19 CN CN201510342396.2A patent/CN106317476A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101899173A (en) * | 2010-07-16 | 2010-12-01 | 山东农业大学 | Edible starch-based food packaging film and preparation method thereof |
| CN104356428A (en) * | 2014-11-12 | 2015-02-18 | 山东农业大学 | Starch nanocomposite film and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107815927A (en) * | 2017-09-29 | 2018-03-20 | 当涂县瑞龙果树种植专业合作社 | A kind of Environmental-protection agricultural paper mulch sheet with enhanced water resistance energy and preparation method thereof |
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Application publication date: 20170111 |