Preparation method of polytrimethylene terephthalate

Abstract

The invention belongs to technical field of polyester fiber preparation, and specifically relates to a preparation method of polytrimethylene terephthalate. According to the preparation method, terephthalic acid and 1, 3-propanediol are taken as raw materials. The preparation method comprises following steps: (1) titanium ethoxide, terephthalic acid and 1, 3-propanediol are delivered into an esterification reaction tank, oxalic acid is added dropwise so as to obtain a mixture, and the mixture is subjected to normal pressure esterification for 30 to 60min at a temperature of 220 to 240 DEG C; and (2) titanium ethoxide is added for stirring, and at the same time oxalic acid is added dropwise for condensation polymerization for 3 to 5h, at a temperature of 220 to 240 DEG C, under a reaction pressure of 0.01 to 0.05 MPa so as to obtain polytrimethylene terephthalate. Technology of the preparation method is simple, and effect is excellent.

Description

technical field

[0001] The invention belongs to the technical field of polyester fiber preparation, in particular to a preparation method of polytrimethylene terephthalate. Background technique

[0002] Polytrimethylene terephthalate (PTT or PPT) fiber is a new type of polyester fiber with excellent performance developed by Shell. It is formed by polycondensation of terephthalic acid (PTA) and 1,3-propylene glycol (PDO). into, and its molecular structure is ((CH 2 )3O O=C O=CO)).

[0003] PPT / PTT is a new type of polyester after PET and PBT. The advantages are comprehensive:

[0004] 1. The softness of nylon (better color fastness than nylon);

[0005] 2. The bulkiness of acrylic fiber (to avoid the disadvantage of easy wear and pilling of acrylic fiber);

[0006] 3. The stain resistance of polyester, (but has a better hand feel).

[0007] 4. It has inherent good elasticity.

[0008] It integrates various excellent performances into one. It has become the latest hot n...