CN103254454A - Method for preparing synthetic macromolecular reinforcement modified starch film through utilizing tape casting method - Google Patents
Method for preparing synthetic macromolecular reinforcement modified starch film through utilizing tape casting method Download PDFInfo
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- CN103254454A CN103254454A CN2013101768254A CN201310176825A CN103254454A CN 103254454 A CN103254454 A CN 103254454A CN 2013101768254 A CN2013101768254 A CN 2013101768254A CN 201310176825 A CN201310176825 A CN 201310176825A CN 103254454 A CN103254454 A CN 103254454A
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Abstract
The invention discloses a method for preparing a synthetic macromolecular reinforcement modified starch film through utilizing a tape casting method. The method comprises steps of: mixing starch and deionized water according to a proper ratio to form a mixture, pouring the mixture into a reactor, stirring at a rotation speed of 250-320r/min by utilizing a stirrer at 80-95DEG C, gelatinizing for 30 minutes to 1 hour, and naturally cooling to be 30-60 DEG C; adding 5-25 parts of synthetic macromolecular aqueous solution or aqueous emulsion, and stirring for 1-2 hours; and uniformly casting and flatly laying the prepared solution on a concave plastic film form board so as to form a film, and drying the film in a vacuum drying oven of 60-70DEG C. The method is simple in preparation technology, organic micromolecular additives do not need to be added, and the prepared starch film satisfies tensile strength performance requirements of packaging films (GB/T4456-1996); and the starch film is low in cost and degradable, and the white pollution is greatly reduced.
Description
Technical field
The present invention relates to the biodegradated polymer materal field, specifically is a kind of method that adopts casting method to prepare synthetic macromolecule enhancing modified starch film.
Background technology
At present, the refractory organics of plastics cause " white pollution " time be engraved in the health of harm humans.In recent years, solve plastic refuse the harm that ecotope causes is received much attention, the exploitation biodegradable plastic is more and more paid attention to as the effective way of administering " white pollution ".Starch is a kind of renewable natural polymer, has Wholly-degradable, and degraded product is harmless fully, the abundant and cheap characteristics in source.Therefore, in the exploitation of biodegradable plastic, starch becomes the optimum feed stock of degradable plastics.
But the key issue that will solve about the biological starch thin film study now is, how to improve starch film forming properties, starch film mechanical property and reduce cost.Patent CN101235156B polylactic acid/thermoplastic starch extrusion blow molding film and production method and application add polylactic acid/thermoplastic starch and various toughner, toughener, lubricant etc. the production method of extrusion blow molding film.The various additives that this method adds can increase cost and complex process greatly.Patent CN101338037B propionyl starch-grafting polylactic acid prepares the method for starch-based film; the present invention utilizes machinery to mediate the reaction that activation starch improves starch and propionic anhydride first, and the method that is aided with High Temperature High Pressure simultaneously reaches the graft copolymerization of propionyl starch and poly(lactic acid).But the propionyl starch-grafting polylactic acid multipolymer that obtains is dissolved in the poisonous acetone, and not environmental protection also needs High Temperature High Pressure, and complex process is reacted bad control.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, and provide a kind of casting method to prepare the method for synthetic macromolecule enhancing modified starch film, this method has low cost, technology is simple, and the starch film that makes has film-forming properties and excellent mechanical property preferably.
The technical scheme that realizes the object of the invention is:
A kind of casting method prepares the method for synthetic macromolecule enhancing modified starch film, comprises the steps:
(1) with starch: the mixed of deionized water=5 ~ 15:85 ~ 95, make mixture and put into reactor, under 80 ~ 95 ℃ environment, stir with the rotating speed of agitator with 250 ~ 320r/min, gelatinization 30min ~ 1h naturally cools to 30 ~ 60 ℃;
(2) add 5 ~ 25 parts of synthetic macromolecule water miscible liquids or the aqueous solution in the mixture of naturally cooling, add water emulsion and return the macromolecular mass that congeals in 50 ~ 95 ℃ of water-baths, returning the time of coagulating is 20 ~ 40min, stirs 1 ~ 2h with agitator again; Add water solution and stir 1 ~ 2h with agitator;
(3) solution that will make through step (2) on ready matrix plastics film template equably cast flat be paved into film, in 60 ~ 70 ℃ of vacuum drying ovens, dry by the fire 24 ~ 48h, namely make synthetic macromolecule enhancing modified starch film.
The described synthetic macromolecule water miscible liquid of step (2) is Vinyl Acetate Copolymer, polyacrylic ester, and concentration is 10% ~ 50%, and the aqueous solution is polyvinyl alcohol, and concentration is 5% ~ 10%.
In the starch film that step (3) makes, the content of synthetic macromolecule plasticized modifier is 2-20%, and contents of starch is 80 ~ 98%.
The described plastics film template of step (3) is the Kapton template.
The present invention compared with prior art has following advantage:
(1) the present invention adopts casting method to prepare synthetic macromolecule enhancing modified starch film, after the synthetic macromolecule aqueous solution or water miscible liquid and pasted starch blend, to starch conversion, can significantly improve film-forming properties, mechanical property and the water tolerance of starch film.Whole technological process is simple, and is easy to operate, and cost is low, and without any need for volatilizable organic molecule additive, degradable does not produce secondary pollution.
(2) the prepared synthetic macromolecule enhancing modified starch film of the present invention, the hydroxyl of macromolecule modifier and starch molecule has formed the structure that is different from former material molecule by associations such as hydrogen bonds, thereby make the treated starch film have film-forming properties and excellent mechanical property preferably, tensile strength is 5 ~ 19Mpa after testing, and elongation at break is 120 ~ 360%.
Embodiment
Be further described below in conjunction with the content of the present invention of embodiment, but be not limitation of the invention.
Embodiment 1
A kind of casting method prepares the method for synthetic macromolecule enhancing modified starch film, comprises the steps:
(1) reactor is put in 10 parts of starch, 90 parts of deionized waters mixing, stirred with the rotating speed of agitator with 250 ~ 320r/min under 95 ℃ environment, gelatinization 1h naturally cools to 60 ℃;
(2) adding 8 parts of concentration in the mixture of naturally cooling is 30% polyvinyl acetate emulsion, and returns the macromolecular mass that congeals in 80 ℃ of water-baths, and returning the time of coagulating is 40min, stirs 2h with agitator again and becomes white liquid;
(3) white liquid that will make through step (2) on ready matrix Kapton template equably cast flat be paved into film, in 60 ℃ of vacuum drying ovens, dry by the fire 24h, namely make the Vinyl Acetate Copolymer starch film.
After testing, the tensile strength of the Vinyl Acetate Copolymer starch film that makes is 18.2MPa, elongation at break 240%.
Embodiment 2
A kind of casting method prepares the method for synthetic macromolecule enhancing modified starch film, comprises the steps:
(1) reactor is put in 10 parts of starch, 90 parts of deionized waters mixing, stirred with the rotating speed of agitator with 250 ~ 320r/min under 95 ℃ environment, gelatinization 1h naturally cools to 30 ℃;
(2) the 6 parts of concentration of mixture adding at naturally cooling are 50% polyacrylate dispersion, and return the macromolecular mass that congeals in 50 ℃ of water-baths, and returning the time of coagulating is 20min, stir 2h one-tenth white liquid with agitator again;
(3) white liquid that will make through step (2) on ready matrix Kapton template equably cast flat be paved into film, in 60 ℃ of vacuum drying ovens, dry by the fire 24h, namely make the polyacrylic ester starch film.
After testing, the tensile strength of the polyacrylic ester starch film that makes is 11.8MPa, elongation at break 150%.
Embodiment 3
A kind of casting method prepares the method for synthetic macromolecule enhancing modified starch film, comprises the steps:
(1) reactor is put in 10 parts of starch, 90 parts of deionized waters mixing, stirred with the rotating speed of agitator with 250 ~ 320r/min under 95 ℃ environment, gelatinization 1h naturally cools to 60 ℃;
(2) adding 25 parts of concentration in the mixture of naturally cooling is 8% polyvinyl alcohol water solution, stirs 2h with agitator;
(3) solution that will make through step (2) on ready matrix Kapton template equably cast flat be paved into film, in 60 ℃ of vacuum drying ovens, dry by the fire 24h, namely make the polyvinyl alcohol starch film.
After testing, the tensile strength of the polyvinyl alcohol starch film that makes is 19.0MPa, elongation at break 350%.
Claims (4)
1. casting method prepares the method for synthetic macromolecule enhancing modified starch film, it is characterized in that comprising the steps:
(1) with starch: the mixed of deionized water=5 ~ 15:85 ~ 95, make mixture and put into reactor, under 80 ~ 95 ℃ environment, stir with the rotating speed of agitator with 250 ~ 320r/min, gelatinization 30min ~ 1h naturally cools to 30 ~ 60 ℃;
(2) add 5 ~ 25 parts of synthetic macromolecule water miscible liquids or the aqueous solution in the mixture of naturally cooling, add water emulsion and return the macromolecular mass that congeals in 50 ~ 95 ℃ of water-baths, returning the time of coagulating is 20 ~ 40min, stirs 1 ~ 2h with agitator again; Add water solution and stir 1 ~ 2h with agitator;
(3) solution that will make through step (2) on ready matrix plastics film template equably cast flat be paved into film, in 60 ~ 70 ℃ of vacuum drying ovens, dry by the fire 24 ~ 48h, namely make synthetic macromolecule enhancing modified starch film.
2. preparation method according to claim 1, it is characterized in that: the described synthetic macromolecule water miscible liquid of step (2) is Vinyl Acetate Copolymer, polyacrylic ester, and concentration is 10% ~ 50%, and the aqueous solution is polyvinyl alcohol, and concentration is 5% ~ 10%.
3. preparation method according to claim 1, it is characterized in that: in the starch film that step (3) makes, the content of synthetic macromolecule plasticized modifier is 2-20%, and contents of starch is 80 ~ 98%.
4. preparation method according to claim 1, it is characterized in that: the described plastics film template of step (3) is the Kapton template.
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| CN2013101768254A CN103254454A (en) | 2013-05-14 | 2013-05-14 | Method for preparing synthetic macromolecular reinforcement modified starch film through utilizing tape casting method |
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| CN2013101768254A CN103254454A (en) | 2013-05-14 | 2013-05-14 | Method for preparing synthetic macromolecular reinforcement modified starch film through utilizing tape casting method |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101143936A (en) * | 2007-09-05 | 2008-03-19 | 哈尔滨工业大学 | Preparation method for completely biodegraded high amylose starches base thin film |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101143936A (en) * | 2007-09-05 | 2008-03-19 | 哈尔滨工业大学 | Preparation method for completely biodegraded high amylose starches base thin film |
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Application publication date: 20130821 |