Purification molecular weight ultrafiltration membrane and its preparation method and method and application of narrowing ptmeg molecular weight
A molecular weight and ultrafiltration membrane technology, applied in chemical instruments and methods, ultrafiltration, membrane technology, etc., can solve the problem of low removal rate of low molecular weight PTMEG, avoid decomposition and oxidation, have good application prospects, and improve product quality. Effect
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Embodiment 1
[0028] Embodiment 1: The purified molecular weight ultrafiltration membrane is obtained according to the following preparation method: the first step is to add a catalyst to the 1,4-butanediol solution of terephthalic acid with a mass percentage of 10% to 15% for pretreatment Polymerization, followed by adding polytetrahydrofuran ether glycol for polycondensation film-forming liquid, wherein, every 2 liters of 1,4-butanediol solution with a mass percentage of 10% to 15% terephthalic acid is added 0.15g to 0.17g The catalyst and the polytetrahydrofuran ether glycol of 100g; The second step, in the membrane liquid, add dispersant and the PVP nano-particle that molecular weight is 200 to 4000 in sequence and stir to obtain mixed membrane liquid after, wherein, every 2 liters of membrane liquid Add 2mg to 4mg of dispersant and 2g to 3g of PVP nanoparticles with a molecular weight of 200 to 4000; the third step is to use the filter membrane with a pore size of 0.15 microns to 10 mic...
Embodiment 2
[0030] Embodiment 2: This purified molecular weight ultrafiltration membrane obtains according to the following preparation method: the first step, adding a catalyst to the 1,4-butanediol solution of terephthalic acid with a mass percentage of 10% or 15% for pretreatment Polymerization, followed by adding polytetrahydrofuran ether glycol for polycondensation film-forming liquid, wherein, every 2 liters of 1,4-butanediol solution with 10% or 15% by mass of terephthalic acid is added 0.15g or 0.17g The catalyst and the polytetrahydrofuran ether glycol of 100g; The second step, add dispersing agent and the PVP nano-particle that molecular weight is 200 or 4000 to the membrane liquid in sequence and stir to obtain mixed membrane liquid after, wherein, every 2 liters of membrane liquid Add 2mg or 4mg of dispersant and 2g or 3g of PVP nanoparticles with a molecular weight of 200 or 4000; the third step is to use the filter membrane with a pore size of 0.15 microns or 10 microns as th...
Embodiment 3
[0031] Embodiment 3: As an optimization of the above embodiment, the catalyst is tetrabutyl titanate; or / and, the dispersant is graphene.
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