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Modified starch PVA-based composite film and preparation method thereof
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A technology of composite film and starch, applied in the field of modified starch PVA-based composite film and its preparation
Pending Publication Date: 2021-11-02
安徽鼎洋生物基材料有限公司
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[0004] The object of the present invention is to provide a kind of modified starch PVA base composite film and preparation method thereof, to solve the technical problem proposed in the above-mentioned background
Method used
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Embodiment 1
[0047] Modified starches are made by the following steps:
[0048] Step 1. Add 0.1mol coupling agent KH-550 and 0.9g 4-methoxyphenol into the three-necked flask, then dropwise add 0.21mol hydroxyethyl acrylate, stir at 80r / min for 0.5h, heat up to 40°C, stir After reacting for 4 hours, extracting with deionized water for 3 times, rotary evaporation at 50°C and -0.1MPa to obtain intermediate 1;
[0049] Step 2. Add 30mmol of intermediate 1, 60mL of tetrahydrofuran and 30mmol of sodiumbromide into a three-necked flask. After stirring for 5 minutes, add 2mL of concentrated sulfuric acid dropwise. After the dropwise addition, heat up to 40°C, stir for 1h and then filter. The filtrate is distilled under reduced pressure. , to obtain intermediate 2;
[0050] Step 3. Add 50mmol of 4,4-dihydroxybenzophenone and 80mL of DMF into a three-necked flask, then dropwise add 40mL of the DMF solution of intermediate 2, then add 0.6g of anhydrouspotassiumcarbonate, heat up to 90°C, and stir...
Embodiment 2
[0057] Modified starches are made by the following steps:
[0058] Step 1. Add 0.1mol coupling agent KH-550 and 1.1g 4-methoxyphenol into the three-necked flask, then dropwise add 0.21mol hydroxyethyl acrylate, stir at 120r / min for 0.5h, heat up to 40°C, and stir After reacting for 5 hours, extracting with deionized water for 5 times, rotary evaporation at 50°C and -0.1MPa to obtain intermediate 1;
[0059] Step 2. Add 30mmol of intermediate 1, 67mL of tetrahydrofuran and 30mmol of sodiumbromide into a three-necked flask. After stirring for 8 minutes, add 4mL of concentrated sulfuric acid dropwise. After the dropwise addition, heat up to 50°C, stir for 2h and then filter. The filtrate is distilled under reduced pressure. , to obtain intermediate 2;
[0060] Step 3. Add 50mmol of 4,4-dihydroxybenzophenone and 100mL of DMF into a three-necked flask, then dropwise add 40mL of the DMF solution of intermediate 2, then add 1.1g of anhydrouspotassiumcarbonate, heat up to 90°C, an...
Embodiment 3
[0069] A modified starch PVA-based composite film, comprising the following raw materials in parts by weight: 20 parts of polyvinyl alcohol, 20 parts of modified starch of Example 1, 400 parts of deionized water, 5 parts of melamine and 5 parts of glyoxalaqueous solution;
[0070] This modified starch PVA base composite film is made by the following steps:
[0071] Step 1: Divide deionized water into two equal parts, add the modified starch of Example 1 to one part, stir and gelatinize at a temperature of 90°C for 30 minutes to obtain a starch solution, add polyvinyl alcohol to the other part, and add polyvinyl alcohol to the other part at a temperature of 90°C Stir for 30min to obtain polyvinyl alcohol solution;
[0072] Step 2: Add starch solution, polyvinyl alcohol solution and melamine into the reaction kettle, stir and mix at 90°C for 20 minutes, add glyoxal aqueous solution, cool down to 45°C and stir for 5 minutes, then put the reaction product in an ultrasonic cleaner...
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Abstract
Belonging to the technical field of film preparation, the invention relates to a modified starch PVA-based composite film. The film is prepared from the following raw materials by weight: 20-30 parts of polyvinyl alcohol, 20-30 parts of modified starch, 400-600 parts of deionized water, 5-8 parts of melamine and 5-10 parts of a glyoxalaqueous solution. The invention also discloses a preparation method of the composite film, and the method comprises the following steps: adding a starch solution, a polyvinyl alcohol solution and melamine into a reaction kettle, performing stirring for 20min, adding a glyoxalaqueous solution, carrying out ultrasonic degassing, and pressing into a film by adopting a press vulcanizer, wherein the modified starch is obtained by carrying out polymerization reaction on an intermediate 5, an intermediate 7, N, N, N-trimethyl-3-(2-methylallylamido)-1-propylammonium chloride and dodecafluoroheptyl methacrylate, and the starch has a plasticizing effect and has multiple functions after being modified; the composite film has excellent mechanical property, self-repairing property, antibacterial property, oxidation resistance and hydrophobic property.
Description
technical field [0001] The invention belongs to the technical field of film preparation, and in particular relates to a modified starch PVA-based composite film and a preparation method thereof. Background technique [0002] Polyvinyl alcohol is a water-soluble polymer with a wide range of uses and unique properties. It has been widely used in the production of coatings, emulsifiers, adhesives, textiles, paper processing agents and plastic films. It has good strong adhesion, toughness and transparency, high film strength, oil resistance, corrosion resistance, solvent resistance, wear resistance, and good gas barrier and thermal stability. Poor water resistance greatly limits its application and cannot meet the needs of PVA films in practical applications. Therefore, it is necessary to modify PVA films, which can not only improve its mechanical and water resistance properties, but also broaden its functions. [0003] Chinese patent CN106117618A discloses an agricultural mulc...
Claims
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