A kind of flame-retardant polyethylene terephthalate system and preparation method thereof
A technology of polyethylene terephthalate and ethylene glycol phthalate, which is applied in the field of flame-retardant PET system and its preparation, can solve the problems of strong hygroscopicity, poor thermal stability, and low flame-retardant efficiency. Achieve the effects of easy operation, improved stability and durability, and improved compatibility
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[0035] The present invention also provides a preparation method of a flame-retardant PET system, comprising the following steps:
[0036] Step 1), weigh a set amount of THEIC into a reaction vessel, add an organic acid after heating up and melting, and keep warm for reaction;
[0037] Step 2), after drying PET, ammonium polyphosphate and the product in step 1, mixing according to the weight ratio, and performing melt blending in a compounding equipment;
[0038] In step 3), the blend obtained in step 2) is post-treated.
[0039] In step 1), the ratio of the amount of THEIC to the amount of organic acid is the molar amount of THEIC: molar amount of organic acid=(3.5-5): 3, preferably (4-4.5): 3; The gas source function of the N heterocycle in THEIC and the carbon source function of the carbon chain are used in excess to reduce the number of free -COOH in the synthesized esterified product.
[0040] The melting temperature is 140°C-160°C, higher than the melting point of THEIC...
Embodiment 1
[0060] 1) Add 104.8g THEIC to a clean three-necked flask, raise the temperature to 150°C, add 49.8g PTA and 0.18g titanium-containing catalyst after the system is completely melted, react at 190°C for 3 hours, cool to room temperature, and obtain T-ester;
[0061] 2) Dry the FRPET slices and APP in a vacuum drying oven at 120°C for 12 hours, weigh 640g of FRPET slices and 160g of APP, and carry out melt blending in a twin-screw extruder with a screw speed of 20r / min and a melting temperature of 270°C;
[0062] 3) The FRPET / IFR series blends obtained after the reaction were vacuum-dried at 120°C for 12 hours, wherein the mass fraction of APP was 20%, and the mass fraction of T-ester was 0%. The sample was named FRPET / IFR20-0. The color appearance of the obtained blended product has no difference from that of FRPET, both are milky white.
Embodiment 2
[0064] 1) Add 91.8g THEIC to a clean three-necked flask, raise the temperature to 150°C, add 43.6g PTA and 0.18g titanium-containing catalyst after the system is completely melted, react at 190°C for 3 hours, cool to room temperature, and obtain T-ester;
[0065] 2) Dry the FRPET slices, APP and T-ester in a vacuum oven at 120°C for 12 hours, weigh 640g of FRPET slices, 136g of APP and 24g of T-ester, and melt and blend them in a twin-screw extruder at a screw speed of 20r / min, melting temperature is 270℃;
[0066] 3) The FRPET / IFR series blends obtained after the reaction were vacuum-dried at 120°C for 12 hours, in which the APP mass fraction was 17%, and the T-ester mass fraction was 3%. The sample was named FRPET / IFR17-3. The color appearance of the obtained blended product has no difference from that of FRPET, both are milky white.
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