Process for producing polyester
A production method and polyester technology, applied in the field of chemical catalysts, can solve the problems of decreased thermal stability, yellow color of polyester, unsatisfactory color of polyester, etc., and achieve the effect of good electrostatic adsorption capacity
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Embodiment 1
[0029] The invention relates to a method for producing polyester, which is prepared from reactants used to produce polyester in the presence of a catalyst. The catalyst is composed of titanium compound, phosphorus compound and magnesium compound, and the titanium compound is a chelated titanium compound of lactic acid.
[0030] Phosphorus-containing compounds are compounds of the formula:
[0031]
[0032] The magnesium compound is magnesium oxalate (or magnesium propionate, magnesium malonate, magnesium succinate, magnesium acetate, magnesium stearate, magnesium hydroxide, magnesium sulfate, magnesium chloride).
[0033] The reaction formula for producing polyester is expressed as:
[0034] catalyst
[0035] A+B-------------------Polyester
[0036] Wherein A, B are the reactant of conventional production polyester.
[0037] A is terephthalic acid (also can be isophthalic acid, phthalic acid, methyl terephthalic acid, naphthalene dicarboxylic acid, bipheny...
Embodiment 2
[0053] The consumption of catalyzer is: the addition relative to polyester weight is:
[0054] The addition of titanium element in the titanium compound is 10ppm
[0055] The amount of phosphorus added in the phosphorus compound is 5ppm
[0056] The amount of magnesium added in the magnesium compound is 17ppm
[0057] The amount of dyestuff is: the addition amount of cobalt element in cobalt acetate is 25ppm
[0058] All the other are with embodiment 1.
Embodiment 3
[0060] The consumption of catalyzer is: the addition relative to polyester weight is:
[0061] The addition of titanium element in the titanium compound is 10ppm
[0062] The amount of phosphorus added in the phosphorus compound is 7.5ppm
[0063] The amount of magnesium added in the magnesium compound is 22ppm
[0064] The amount of dyestuff is: the addition amount of cobalt element in cobalt acetate is 25ppm
[0065] All the other are with embodiment 1.
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