Method for producing low-melting-point renewable polyester for sheath-core polyester through glycol degradation
A technology of recycled polyester with low melting point, applied in filament/thread forming, conjugated synthetic polymer artificial filament, textile and papermaking, etc., which can solve problems such as poor stability, reduced production cost, and poor spinnability of fibers, Achieve stable quality, increase added value, and excellent quality
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[0024] Example 1
[0025] 1. Preparation of recycled low-melting polyester: the mass ratio of recycled raw materials to methanol is 1:6; the mass ratio of recycled raw materials to zinc acetate is 100:0.5; the above raw materials are polymerized to produce recycled low-melting polyester after methanolysis :The degradation temperature is 190℃, the pressure is 2.5Mpa, the reaction time is 3h, the reaction is over when the pressure returns to atmospheric pressure, the reactants are filtered, the liquid obtained is rotary evaporated, and the methanol and ethylene glycol are respectively evaporated to obtain solids It is dissolved in hot ethanol and filtered, and the obtained liquid is evaporated to remove ethanol to obtain dimethyl terephthalate (DMT). The molar ratio of dimethyl terephthalate (DMT) to isophthalic acid (IPA) is 3:1; the molar ratio of dimethyl terephthalate (DMT) to neopentyl glycol (NPG) is 7:1; the molar ratio of dimethyl terephthalate (DMT) to ethylene glycol is ...
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[0032] Example 2
[0033] 1. Preparation of recycled low-melting polyester: the mass ratio of recycled raw materials to water is 1:4; the mass ratio of recycled raw materials to potassium acetate is 100:0.5; the above raw materials are polymerized to prepare recycled low-melting polyester through hydrolysis: hydrolysis The temperature is 220°C, the pressure is 4.5Mpa, and the reaction time is 2.8h. When the pressure returns to atmospheric pressure at the end of the reaction, the reactants are filtered, the resulting liquid is rotary evaporated to obtain ethylene glycol, and the filtered solids are dissolved in DMF and filtered. The obtained liquid is recrystallized to obtain terephthalic acid (TPA). The molar ratio of terephthalic acid (TPA) to adipic acid (AA) is 3.5:1; the molar ratio of terephthalic acid (TPA) to hexanediol (HG) is 6:1; terephthalic acid The molar ratio of (TPA) to ethylene glycol is 1.5:1; the molar ratio of alkyd acid is 1.5:1; the catalyst antimony trioxi...
Example Embodiment
[0040] Example 3
[0041] 1. Preparation of recycled low-melting polyester: the mass ratio of recycled raw materials to ethylene glycol is 1:3.5; the mass ratio of recycled raw materials to butadiyl tin laurate is 100:0.5; the alcoholysis reaction temperature is 196°C, The pressure is 0.15MPa, the reaction time is 2h, and the intrinsic viscosity of the reaction liquid reaches 0.29dl / g. After the reaction is over, the reaction liquid is quickly hot filtered, and the filtrate is subjected to vacuum distillation to recover ethylene glycol. The liquid after vacuum distillation (solid at room temperature) is dissolved in hot alcohol, ester, chlorinated hydrocarbon, ketone and other solvents , Heat filtered to remove insolubles, and the filtrate is naturally cooled to obtain BHET and its oligomers. Add isophthalic acid (IPA), neopentyl glycol (NPG), antimony trioxide (Sb203) and cobalt acetate (Co(Ac) to the ethylene terephthalate (BHET) and its oligomers ) 2) Conduct polycondensat...
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