Synthetic method of biodegradable polyhydroxybutyrate copolymerization mixture
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A technology of polyhydroxybutyrate and ethyl hydroxybutyrate, which is applied in the field of synthesis of polyhydroxybutyrate copolymer mixture
Inactive Publication Date: 2013-12-25
NANJING NIANJI REFRIGERATION FOOD
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Problems solved by technology
Polyhydroxybutyrate (PHB) is a new type of plastic that can be completely biodegradable. Its applications include the production of disposable products such as fast food boxes, plastic films and packaging materials. More importantly, it can be used in medicine, optoelectronic chemistry, fine chemicals, etc. The high-tech industry has a broad market in high-tech and high value-added fields, but due to the shortcomings of high crystallinity, poor mechanical properties, easy thermal decomposition and difficult processing, the application range of PHB is limited to a certain extent.
[0003] According to reports in CN201210167714.2, with 3-hydroxybutyric acid and 3-hydroxyvaleric acid copolymerized, the resulting copolymer can solve the single-component 3- The defect of hydroxybutyric acid polymer makes its hardness decrease, toughness increase, melting point decrease, etc. The copolymer of PHB is mainly produced by biological fermentation method. The production cost of PHB prepared by biological fermentation method is high and the operation is difficult, which greatly limits its popularization and application. At present, there is no large-scale industrialization at home and abroad
Method used
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Embodiment 1
[0015] Add metered 3-hydroxybutyrate ethyl ester (500.0kg), 3-hydroxyvalerate ethyl ester (100.0kg), polyethylene glycol (100.0kg), and composite catalyst (0.1kg) into the reaction kettle, fill with nitrogen Replace the air in the kettle and protect it with nitrogen, heat to 150~180°C, stir thoroughly for 3 hours; slowly evacuate until the absolute pressure is 1.0Kpa, cool down to 135~150°C, react for 12 hours, recover ethanol, DEK Bio Degradable polyhydroxybutyrate copolymer mixture, yield 79.8%, molar mass 23981.6g / mol.
Embodiment 2
[0017] Add metered 3-hydroxybutyrate ethyl ester (580.0kg), 3-hydroxyvalerate ethyl ester (100.0kg), polyethylene glycol (100.0kg), and composite catalyst (0.1kg) into the reaction kettle, fill with nitrogen Replace the air in the kettle and protect it with nitrogen, heat to 150~180°C, stir thoroughly for 3 hours; slowly evacuate to an absolute pressure of 0.8Kpa, cool down to 135~150°C, react for 15 hours, recover ethanol, DEK Bio Degradable polyhydroxybutyrate copolymer mixture, yield 79.1%, molar mass 24123.2g / mol.
Embodiment 3
[0019] Add metered 3-hydroxybutyrate ethyl ester (620.0kg), 3-hydroxyvalerate ethyl ester (100.0kg), polyethylene glycol (100.0kg), and composite catalyst (0.1kg) into the reaction kettle, fill with nitrogen Replace the air in the kettle and protect it with nitrogen, heat to 150~180°C, stir thoroughly for 3 hours; slowly evacuate to an absolute pressure of 0.8Kpa, cool down to 135~150°C, react for 16 hours, recover ethanol, DEK Bio Degradable polyhydroxybutyrate copolymer mixture, yield 78.8%, molar mass 23887.6g / mol.
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Abstract
The invention discloses a synthetic method of a biodegradable polyhydroxybutyrate copolymerization mixture. The method is characterized by being a novel chemical synthetic method comprising the following step of copolymerizing ethyl 3-hydroxybutyrate serving as a body, 3-hydroxypentanoate and polyethylene glycol in the presence of a compound catalyst, so as to prepare biodegradable polyhydroxybutyrate (PHB). The method has the advantages of low catalyst consumption, short reaction time, high yield, greatly reduced cost, simple technological operation and can be easily put into industrial production; and the prepared PHB copolymerization mixture has the characteristics of biodegradability, reduced hardness, enhanced toughness, reduced melting point and the like.
Description
technical field [0001] The invention belongs to the field of polymer materials, in particular to a synthesis method of a biodegradable polyhydroxybutyrate copolymer mixture. Background technique [0002] Due to the excellent characteristics of light weight, waterproof, high strength, corrosion resistance, and easy processing, plastics are widely used in various fields of the national economy. The production and use of plastics are increasing, and with it the problem is that the amount of waste plastics is also increasing. Discarded plastics, especially disposable plastic waste such as plastic mulch, garbage bags, shopping bags, tableware, food packaging bags, grocery and industrial product packaging bags, pollute farmland, tourist attractions, coastal ports, entangle marine life, and cause " "White pollution" is becoming more and more serious. Degradable plastics have the following advantages for the environment: (1) can be quickly made into compost and returned to nature;...
Claims
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Application Information
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