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Method for preparing material special for polybutylene terephthalate (PBT) optical fiber loose tubes

A technology of fiber loose and special materials, applied in the direction of fiber mechanical structure, etc., can solve the problems of uneven and unstable product quality, and achieve the effect of reducing and midway transportation, cost saving, considerable economic benefits and social significance

Active Publication Date: 2012-09-19
CHINA PETROCHEMICAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of uneven and unstable product quality in the prior art, and provide a preparation method for the continuous production of special products for PBT optical fiber loose tubes by direct esterification, so that special additives can be mixed evenly in the product , the quality of optical fiber loose tube PBT products is more stable, meeting the requirements of high-speed production trends in the loose tube processing process

Method used

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  • Method for preparing material special for polybutylene terephthalate (PBT) optical fiber loose tubes
  • Method for preparing material special for polybutylene terephthalate (PBT) optical fiber loose tubes
  • Method for preparing material special for polybutylene terephthalate (PBT) optical fiber loose tubes

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Effect test

Embodiment 1

[0039] The production load of the direct esterification polymerization unit is 30 tons / day, and the production load of the solid phase thickening device is 20 tons / day. 1,4-butanediol and terephthalic acid are prepared into a slurry mixture at a ratio of 1.5:1, and the solid additive and BDO required for the production of PBT optical fiber loose tube are prepared according to the aforementioned method, and then the final product contains about The ratio of 0.5wt% is added to the slurry preparation tank 3 through the gear pump 8, mixed with the slurry, and then entered into the esterification reactor 4. Catalyst tetrabutyl titanate is added into the esterification reactor 4 at a certain concentration. The esterification reaction temperature is about 255°C, and the pressure is controlled at about 200kPa (absolute pressure, the same below). The material in the esterification reactor 4 enters the pre-condensation reactor 5 for polycondensation reaction, the temperature is control...

Embodiment 2

[0042]The production load of the direct esterification polymerization unit is 45 tons / day. The production load of the solid phase thickening device is 20 tons / day. 1,4-butanediol and terephthalic acid are prepared into a slurry mixture at a ratio of 1.5:1, and the solid additive and BDO required for the production of PBT optical fiber loose tube are prepared according to the aforementioned method, and then the final product contains about The proportion is 1wt%, and it is added to the slurry preparation tank 3 through the gear pump 8, mixed with the slurry, and then enters the esterification reactor 4. Catalyst tetrabutyl titanate is added into the esterification reactor 4 at a certain concentration. The esterification reaction temperature is about 260°C, and the pressure is controlled at about 200kPa. The material in the esterification reactor 4 enters the pre-condensation reactor 5 for polycondensation reaction. The temperature of the polycondensation reaction is controlle...

Embodiment 3

[0045] The production load of the direct esterification polymerization unit is 60 tons / day. The production load of the solid phase thickening device is 20 tons / day. 1,4-butanediol and terephthalic acid are prepared into a slurry mixture at a ratio of 1.5:1, and the solid additive and BDO required for the production of PBT optical fiber loose tube are prepared according to the aforementioned method, and then the final product contains about The proportion is 1wt%, and it is added to the slurry preparation tank 3 through the gear pump 8, mixed with the slurry, and then enters the esterification reactor 4. Catalyst tetrabutyl titanate is added into the esterification reactor 4 at a certain concentration. The esterification reaction temperature is about 260°C, and the pressure is controlled at about 200kPa. The material in the esterification reactor 4 enters the pre-condensation reactor 5, the polycondensation reaction temperature is controlled at about 250° C., and the reaction...

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Abstract

The invention provides a method for preparing a material special for polybutylene terephthalate (PBT) optical fiber loose tubes. The method comprises the following steps of: uniformly mixing a solid additive required by the production of the PBT optical fiber loose tubes and 1,4-butanediol, conveying and metering by using a gear pump, adding into a slurry preparation tank in a proportion, allowing the obtained slurry and slurry which is prepared from 1,4-butanediol and terephthalic acid to enter an esterification reaction kettle, and thus obtaining a PBT base material for optical fiber loose tubes by a direct esterification and continuous condensation production technology; and ensuring that the PBT base material continuously enters a solid-phase system through metering, preheating and crystallizing, entering a solid-phase reactor for tackification at the temperature of 170 to 210 DEG C for 15 to 20 hours, cooling a product obtained after tackification, dedusting, conveying, and packaging to obtain the material special for the PBT optical fiber loose tubes. By the method, a color value of the product can be effectively controlled, the special additive is uniformly mixed in the product, the PBT product for the optical fiber loose tubes has relatively stable quality, and the high-speed development tendency of the machining process of the loose tubes is met.

Description

technical field [0001] The invention relates to a preparation method of a special material for a PBT optical fiber loose tube, and belongs to the technical field of chemical production. Background technique [0002] At present, the production methods of global PBT optical fiber loose tube special products include continuous polymerization method, solid phase continuous viscosification method, drum viscosification method, etc. The domestic production method is mainly drum viscosification method. [0003] The so-called drum viscosification method is to use medium and low viscosity PBT resin, together with special masterbatch or additives, to make special products after heating and viscosifying under the vacuum state of the drum. The production scale of this method is small, and the stability between batches is poor. Si Shuhua has a brief description in "Research on the Forming and Processing of PBT Materials for Optical Cables". [0004] The solid-phase continuous thickening...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183C08G63/78C08G63/90G02B6/44
Inventor 李仁海沙广超马健黄娟杨诚耿昌东张军巢平
Owner CHINA PETROCHEMICAL CORP
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