Catalyst for producing poly(trimethylene terephthalate), preparation method and application
A technology of polytrimethylene terephthalate and catalyst, which is applied in the field of preparing this catalyst, can solve the problems of deactivation of titanium compounds, changing the balance of polytrimethylene terephthalate, and no mention, etc., and achieve good technical effects Effect
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Embodiment 1
[0047] Mix 142g of tetraisopropyl titanate with 124g of ethylene glycol and 22.5g of tartaric acid, and react for 4 hours at a temperature of 100°C in a stirred reactor, add 37g of zinc lactate to the reactant, In the reaction at 120°C for 4 hours. The reaction product is placed in a reactor equipped with a fractionation device, and isopropanol and water are distilled off to make a catalyst. The catalyst is mixed with 1,3-propanediol, wherein the mass fraction of titanium atoms is 4%.
[0048] 600 grams of terephthalic acid, 440 grams of 1,3 propylene glycol, catalyzer 1.49g and stabilizing agent phosphoric acid (50ppm relative to terephthalic acid) are mixed and made into slurry, join in the polymerization still, carry out esterification reaction, esterification temperature is 230°C, the pressure is 0.25MPa, the water produced by the reaction is discharged through the rectification device, and the reaction is carried out for 2 hours. After the esterification is completed, t...
Embodiment 2-4
[0051] Adopt the catalyst preparation method identical with embodiment 1, difference is that the addition amount of tartaric acid is respectively 75g, 120g and 190g.
Embodiment 5-6
[0053] The same catalyst preparation method as in Example 1 was adopted, except that 172 g of 1,3 propanediol and 180 g of 1,4 butanediol were used as straight chain diols.
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