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Method for preparing polytrimethylene terephthalate

The technology of polytrimethylene terephthalate and terephthalic acid is applied in the field of preparation of polytrimethylene terephthalate, and can solve the problems of high content of terminal carboxyl group and acrolein, poor stability, yellowing of products, etc. Low content of terminal carboxyl group, high stability and good color effect

Inactive Publication Date: 2014-05-07
JINAN DEV ZONE XINGHUO SCI & TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN 101186692A discloses a composite catalyst for synthesizing poly(trimethylene terephthalate) and its preparation method. The composite catalyst is composed of alumina, titanium dioxide and molybdenum trioxide. There is no hydrolysis in the catalyst system, and the activity is very high, but the end The content of carboxyl group and acrolein is very high, so the direct use of titanate as a catalyst has the disadvantages of easy hydrolysis, poor stability and yellowing of the product

Method used

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  • Method for preparing polytrimethylene terephthalate

Examples

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Embodiment 1

[0023] 1. Preparation of nano-tetrabutyl titanate / nano-silica supported catalyst

[0024] Take 0.6g of hydrophilic nano-silica and place it in the flask, add 10mL of oleic acid and 300mL of toluene, stir evenly and ultrasonically disperse, then add 0.2g of isopropyl tris(dioctyl pyrophosphate acyloxy) titanic acid The ester was treated in a water bath at 90℃ for 2h; then the toluene was removed by rotary evaporation, washed three times with ether and then dried and ground; the ground modified nano-silica and 0.3g of tetrabutyl titanate were placed in 250ml of dry toluene with 90Hz ultrasound Shake for 30min to disperse evenly, soak for 1d at room temperature; wash and dry after centrifugal separation.

[0025] 2. Synthesis of Polytrimethylene Terephthalate (PTT)

[0026] Weigh the raw materials according to the molar ratio of terephthalic acid and 1,3-propanediol 1:1.5 and place them in the polymerizer, and place it in the polymerizer at 5×10 of the molar amount of terephthalic acid...

Embodiment 2

[0029] Same as Example 1, the difference is:

[0030] The amount of catalyst in step (2) is 7×10 of the molar amount of terephthalic acid -4 .

[0031] The content of terminal carboxyl group is determined to be 18.237mol / t, and the intrinsic viscosity is 1.05 dL / g -1 , Get white PPT resin.

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Abstract

The invention relates to the field of polymer materials, and in particular relates to a method for preparing polytrimethylene terephthalate. The method comprises the following steps: (1) preparing a nano-tetrabutyl titanate / nano-silicon dioxide supported catalyst; and (2) synthesizing polytrimethylene terephthalate. The nano-tetrabutyl titanate / nano-silicon dioxide supported catalyst prepared by the method is high in activity, can be used either in a catalytic esterification reaction or a catalytic polycondensation, PPT (polytrimethylene terephthalate) prepared by utilizing the catalyst has high intrinsic viscosity, and is low in content of a terminal carboxyl group, so that titanate can be directly used as a catalyst and has high stability and good color.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a preparation method of polytrimethylene terephthalate. Background technique [0002] Polytrimethylene terephthalate (PTT) is a promising new type of thermoplastic polyester successfully developed in the mid-1990s. Compared with polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), PTT has excellent performance due to its unique helical structure, which combines the softness of nylon, The bulkiness of acrylic fiber and the stain resistance of polyester, together with its inherent elasticity, moderate glass transition temperature and good processing performance, integrate the excellent properties of various fibers. Moreover, PTT is easy to copolymerize with nylon or polyester fibers, blend with cellulose filaments, and compound with elastic fibers (such as polyurethane, polyether-based fibers, etc.), and has the advantages of no fading and no yellowing. One of ...

Claims

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Application Information

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IPC IPC(8): C08G63/82C08G63/183
Inventor 车春玲
Owner JINAN DEV ZONE XINGHUO SCI & TECH RES INST
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