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Preparation method for polyethylene terephthalate/molecular sieve composite material

A polyethylene terephthalate and composite material technology, applied in the field of resin material preparation, can solve the problems of slow crystallization speed, limited application, high crystallization temperature, etc., to increase the crystallization rate, reduce the grain size distribution, The effect of raising the crystallization temperature

Inactive Publication Date: 2015-05-13
任福生
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Problems solved by technology

However, its high crystallization temperature and slow crystallization speed limit its application in the field of engineering plastics

Method used

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specific Embodiment

[0011] Specific embodiments: the preparation process of the present invention includes three steps of mesoporous molecular sieve treatment, esterification reaction and polycondensation reaction;

[0012] The mesoporous molecular sieve treatment: after vacuum drying the mesoporous molecular sieve at 230°C for 3 hours, put it into a three-necked flask, heat it to 140°C and vacuumize it for 2 hours, then lower it to room temperature, inject ethylene glycol with a syringe, and then add terephthalic acid , ultrasonic stirring and dispersion for 40min;

[0013] The esterification reaction: add terephthalethylene glycol oligomer into a four-neck flask, heat to 250°C to melt, then add the above-mentioned ultrasonically dispersed mixture with a syringe, add once every 3 min, 5 mL each time, distill out The esterification reaction ends when the temperature drops to 70°C;

[0014] The polycondensation reaction: put the esterified product into the polycondensation tank and heat it to 250...

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Abstract

A preparation method for a polyethylene terephthalate / molecular sieve composite material belongs to the field of preparation of resin materials, and the prepared polyethylene terephthalate / mesoporous molecular sieve composite material is high in crystallization speed. The method employs an in-situ polymerization process, and the polyethylene terephthalate / molecular sieve composite material is prepared through three steps of mesoporous molecular sieve processing, esterification reaction and polycondensation. By adding the mosoporous molecular sieve, the method helps to improve PET (polyethylene terephthalate) crystallization temperature, increase crystallization degree, increase crystallization speed and reduce crystal grain size distribution.

Description

technical field [0001] The invention belongs to the field of resin material preparation. Background technique [0002] Polyethylene terephthalate (PET) has excellent mechanical properties, electrical insulation, heat resistance and chemical resistance. However, its high crystallization temperature and slow crystallization rate limit its application in the field of engineering plastics. therefore. Improving the crystallization speed of PET and improving its processing performance have always been one of the main directions of PET modification. In the past few years, the mesoporous molecular sieves that have been successfully studied have a large specific surface area (generally greater than 700m 2 / g) and pore volume (hydrocarbon adsorption is generally greater than 0.7cm 3 / g) and has received great attention in the field of catalysis. Mesoporous molecular sieves can absorb a large number of small molecular monomers and polymerize them in the pores under appropriate cond...

Claims

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Application Information

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IPC IPC(8): C08G63/183C08G63/85C08K9/04C08K7/26
Inventor 任福生
Owner 任福生
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