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Method for improving crystallization performance and thermal performance of PET fiber by using modified silicon dioxide

A technology of silica and crystallization properties, which is applied in the fields of fiber chemical characteristics, textiles and papermaking, and fire-resistant and flame-retardant filament manufacturing. It can solve the problems of not improving polymer properties, reducing polymer properties, and large specific surface area. Achieve the effect of improving crystallization performance and thermal performance, low cost and low pollution

Inactive Publication Date: 2018-07-06
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, nano-scale silica has a large specific surface area and is very easy to agglomerate in organic matter, which will not improve the performance of the polymer, but will reduce the performance of the polymer

Method used

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  • Method for improving crystallization performance and thermal performance of PET fiber by using modified silicon dioxide
  • Method for improving crystallization performance and thermal performance of PET fiber by using modified silicon dioxide
  • Method for improving crystallization performance and thermal performance of PET fiber by using modified silicon dioxide

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Embodiment 1

[0029] figure 1 It is the chemical equation for preparing modified silica nanoparticles and the structure schematic diagram of the obtained PET fiber in the present invention, wherein 1 is modified silica, and 2 is PET fiber. In the present embodiment, the method for improving the crystallization performance and thermal performance of PET fibers by using modified silica specifically includes the following steps:

[0030] Preparation of modified nano-silica: first, in benzene, under nitrogen protection, use thionyl chloride to pre-activate the surface of nano-silica, introduce chlorine atoms into the surface of the silica, wash 3 times with benzene, and centrifuge; then In toluene, under the protection of nitrogen, small molecule polyethylene glycol (PEG) was grafted onto the surface of chlorine-containing nano silicon dioxide (SiO 2 -PEG), washed twice with toluene and acetone, and dried by centrifugation; then in the solution of mass fraction phenol:tetrachloroethane=1:1, lo...

Embodiment 2

[0040] In the present embodiment, the method for improving the crystallization performance and thermal performance of PET fibers by using modified silica specifically includes the following steps:

[0041] Preparation of modified nano-silica: first, in benzene, under nitrogen protection, use thionyl chloride to pre-activate the surface of nano-silica, introduce chlorine atoms into the surface of the silica, wash 3 times with benzene, and centrifuge; then In toluene, under the protection of nitrogen, small molecule polypropylene glycol (PPG) was grafted onto the surface of chlorine-containing nano-silica (SiO 2 -PPG), washed twice with toluene and acetone, and centrifuged and dried; then in the solution of mass fraction phenol:tetrachloroethane=1:1, low molecular weight polyethylene terephthalate (LMPET ) grafted to the hydroxyl groups of the PPG segment to form SiO 2 -PPG-LMPET nanoparticles, that is, modified nano silicon dioxide.

[0042] Preparation of PET fiber by using ...

Embodiment 3

[0048] In the present embodiment, the method for improving the crystallization performance and thermal performance of PET fibers by using modified silica specifically includes the following steps:

[0049] Preparation of modified nano-silica: first, in benzene, under nitrogen protection, use thionyl chloride to pre-activate the surface of nano-silica, introduce chlorine atoms into the surface of the silica, wash 3 times with benzene, and centrifuge; then In toluene, under the protection of nitrogen, the polyether diol of small molecules is grafted onto the surface of chlorine-containing nano-silica (silicon dioxide-polyether diol), washed twice with toluene and acetone, and dried by centrifugation; Then in the solution of mass fraction phenol:tetrachloroethane=1:1, low molecular weight polyethylene terephthalate (LMPET) is grafted to the hydroxyl group of the polyether glycol chain segment to form carbon dioxide Silicon-polyether glycol-polyethylene terephthalate nanoparticles...

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Abstract

The invention discloses a method for improving the crystallization performance and thermal performance of PET fiber by using modified silicon dioxide. The method comprises the following steps: preparing modified nanometer silicon dioxide; using thionyl chloride to carry out pre-activation on the surface of nanometer silicon dioxide, grafting a flexible polyglycol polymer onto the surface of the chlorine-containing nanometer silicon dioxide, then grafting polyethylene glycol terephthalate (LMPET) with low molecular weight to hydroxy of flexible polyglycol to form modified silicon dioxide nanoparticles; carrying out pelleting blending on the obtained modified silicon dioxide and PET, and thus preparing the PET fiber containing modified silicon dioxide in a certain proportion. The nanometer silicon dioxide is modified, so that the compatibility of nanometer silicon dioxide and PET is improved, and nanometer silicon dioxide is added into the PET for spinning, so that the crystallization performance and thermal performance of the PET fiber are improved. The modified PET fiber is high in thermal stability and good in crystallization performance, and has extremely good application prospects.

Description

technical field [0001] The invention relates to the field of PET fibers, in particular to a method for improving the crystallization performance and thermal performance of PET fibers by using modified silicon dioxide. Background technique [0002] Polyethylene terephthalate (PET), also known as polyester or Dacron, is the most important variety of thermoplastic polyester. It is produced by transesterification of terephthalic acid and ethylene glycol, or esterification of terephthalic acid and ethylene glycol to form bishydroxyethyl terephthalate, followed by polycondensation. PET has good mechanical properties, acid and alkali resistance, oil resistance, low temperature and high temperature resistance, non-toxic, tasteless, hygienic and safe, and can be used for food packaging. It is widely used and has excellent performance. [0003] Silicon dioxide (SiO 2 ) is chemically stable, does not react with water, and widely exists in nature. However, nano-scale silica has a la...

Claims

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Application Information

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IPC IPC(8): D01F6/92D01F1/10D01F1/07
CPCD01F1/07D01F1/10D01F6/92
Inventor 王瑶崔学伟唐建国刘继宪黄林军焦吉庆王彦欣王薇王世超邢丽
Owner QINGDAO UNIV
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