Preparation method of ployethylene terephthalate composite material with high obstructing performance
A technology of polyethylene terephthalate and composite materials, which is applied in the field of preparation of polyethylene terephthalate composite materials, can solve the problem of affecting the performance of composite materials, affecting the dispersion effect of nanoparticles, and the easy occurrence of mixtures Reunion and other issues
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Embodiment 1
[0016] In the esterification process stage of producing PET, titanium oxide sol accounting for 50% by weight of the reaction mixture is added, wherein titanium oxide accounts for 5% by weight of the sol, and the particle size is approximately normal distribution between 1nm and 50nm. The solvent is ethylene glycol. The esterification reaction temperature is 200-220° C., the reaction pressure is 0.1-0.25 MPa, and the reaction time is 1-2 hours. The product of the above esterification process is then subjected to a polycondensation process to obtain a high-barrier PET composite material. Among them, the polycondensation reaction temperature in the low vacuum stage is 200-240°C, the reaction pressure is 100,000-500Pa, and the reaction time is 10-30 minutes; the polycondensation reaction temperature in the high vacuum stage is 250-275°C, the reaction pressure is 500-50Pa, and the reaction time 1 to 1.5 hours.
Embodiment 2
[0018] Adding the mixture of silica sol and nano-silicon dioxide particles accounting for 70% by weight of the reaction mixture in the esterification process stage of producing PET, wherein the silica sol accounts for 10wt% of the total amount of additives, and the inorganic The weight percentage of the nano-oxides in the sol is 30%, the particle size of the inorganic nano-oxides is approximately normal distribution between 5nm and 10μm, and the solvent is ethylene glycol. Wherein the esterification reaction temperature is 220-240° C., the reaction pressure is 0.2-0.6 MPa, and the reaction time is 1.5-2 hours. The product of the above esterification process is then subjected to a polycondensation process to obtain a high-barrier PET composite material. Among them, the polycondensation reaction temperature in the low vacuum stage is 230-250°C, the reaction pressure is 100,000-500Pa, the reaction time is 20-30 minutes, the polycondensation reaction temperature in the high vacuum...
Embodiment 3
[0020] Adding the mixture of zirconium dioxide sol and nano zirconium dioxide particles accounting for 1% by weight of the reaction mixture in the esterification process stage of producing PET, wherein the zirconium dioxide sol accounts for 90wt% of the total amount of additives, and the inorganic The weight percentage of the nano-oxides in the sol is 15%, the particle size of the inorganic nano-oxides is approximately normal distribution between 5nm and 10μm, and the solvent is ethylene glycol. Wherein the esterification reaction temperature is 220-240° C., the reaction pressure is 0.2-0.25 MPa, and the reaction time is 1.5-2 hours. The product of the above esterification process is then subjected to a polycondensation process to obtain a high-barrier PET composite material. Among them, the polycondensation reaction temperature in the low vacuum stage is 230-250°C, the reaction pressure is 100,000-500Pa, the reaction time is 20-30 minutes, the polycondensation reaction temper...
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