Modified polyester and preparing method thereof

A modified polyester and modified technology, which is applied in the field of polyester, can solve problems such as large fluctuations in viscosity, low resin intrinsic viscosity, and poor crystallization performance, and achieve excellent crystallization performance, improved crystallization performance, and high molecular weight. Effect

Inactive Publication Date: 2007-08-01
浙江工程学院
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In a class of commercially available alkali-soluble polyethylene terephthalate resins, on the one hand, due to the use of various organic acid components such as isophthalic acid, SIPE and aliphatic dibasic acids, the melting point of the resin is too high. Low, poor crystallization performance, resin chips are prone to sticking during the drying and pre-crystallization process, and the operation is very difficult; on the other hand, due to the addition of SIPE, the intrinsic viscosity of the resin is too low, and the intrinsic viscosity fluctuates between batches Larger, the wool and broken filaments increase sharply during spinning

Method used

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  • Modified polyester and preparing method thereof
  • Modified polyester and preparing method thereof

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Embodiment

[0021] Put terephthalic acid and ethylene glycol into the esterification tank at a ratio of 1:0.7, and then add 0.01% catalyst (Sb 2 o 3 ), antioxidant 1% (1010, DLTP), carry out esterification reaction at 0.2MPA-0.4MPA, 210-260 ℃, when the distillate amount of esterification water reaches the target value, it is transferred to the polycondensation kettle, first Drop into SIPE-EG solution according to the required ratio, after the temperature in the still drops to below 230 ℃, drop into a certain amount of PEG again, PEG is 5% (percentage by weight) of terephthalic acid PTA content, heat while stirring, the At the same time, EG was distilled out. After 45 minutes, the temperature was raised to 260°C, and the vacuum was turned on. Under the pressure of 50Pa, 260°C-280°C, high vacuum polycondensation for 1.5-2.0 hours, when the intrinsic viscosity reached 0.40-0.50, the material was discharged, cast Tape, cut into pieces. Then, pre-crystallize the slices at 80-120°C under norm...

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Abstract

A modified polyester is produced by: during synthesis of poly(p-diformyl benzene) oxalate ester PET, having p-diformyl benzene PTA, glycol EG as main materials, adding 5-sodium sulphonate (o-diformyl benzen) oxalate ester SIPE, and polyglycol PEG to have a chemical reaction to get polyester. The prepared modified polyester adopts solid phase condensed polymerization to reach higher special viscosity, and to add specific substances SIPE and PEG to copolymer. Because of introducing sulfonate group, space steric hindrance between macromolecules and electronic cloud of benzen cycle has changed, so as to promote macromolecule alkali for hydrolysis. Ether bond introduced is helpful to alkali hydrolysis,also improves the crystal capability for high molecular polymer. This invention has benefitial effects :1) good sorting fiber effect, sea phase quick dissolved and insular phase separating downright during island composite thread's post treatment, 2) resin having high melting point, high molecular weight, well spinning capability, and 3) good crystallization without adhesive connection while slicing up.

Description

technical field [0001] The invention relates to the polyester field, mainly relates to a modified polyester and a manufacturing method thereof, and is mainly used in the manufacture of sea-island composite ultrafine polyester fibers. Background technique [0002] Polyester fiber is widely used due to its many excellent characteristics. At present, the conventional melt spinning method can only produce fibers with a single fiber linear density higher than 0.3dtex. The main method of fine fibers. The "island" component in the sea-island composite yarn is usually ordinary polyester, and the "sea" component is currently mainly made of alkali-soluble and easily hydrolyzed polyester. The sea component in the middle is removed, and the microfiber of the island component remains. In a class of commercially available alkali-soluble polyethylene terephthalate resins, on the one hand, due to the use of various organic acid components such as isophthalic acid, SIPE and aliphatic dibas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/46C08G63/78
Inventor 程贞娟秦伟明凌荣根
Owner 浙江工程学院
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