Super-branched polyester and preparation method as well as application in high-speed stretch electrostatic spinning thereof

A technology of hyperbranched polyester, spinning solution, applied in the manufacture of rayon, chemical characteristics of fibers, textiles and papermaking, etc., can solve the control without involving the spinning shape, increase the processing temperature, cannot generally improve the spinning phenomenon and other problems, to solve the phenomenon of fiber entanglement and filament doubling, improve the fiber morphology, and reduce the amount of solvent

Active Publication Date: 2010-06-16
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is still a huge challenge to control the uniform working temperature of the entire spinning system and control the instability of solvent volatilization at the outlet of the spinning solution caused by temperature rise.
[0006] 3. Only by increasing the processing temperature can not generally improve the parallel phenomenon

Method used

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  • Super-branched polyester and preparation method as well as application in high-speed stretch electrostatic spinning thereof
  • Super-branched polyester and preparation method as well as application in high-speed stretch electrostatic spinning thereof
  • Super-branched polyester and preparation method as well as application in high-speed stretch electrostatic spinning thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0044] Example 1

[0045] Preparation of hyperbranched polymers with acetyl groups as end groups and as electrospinning additives:

[0046]

[0047] Under anhydrous and anaerobic conditions, add 5.0g (2.9mmol) H20 and 0.15g 4-dimethylaminopyridine (DMAP) to the Schlenk bottle in a certain stoichiometric ratio (3~4 relative to the mass fraction of H20). %), 11.2ml (138.7mmol) of pyridine as a catalyst, 15ml of tetrahydrofuran as a solvent, slowly drip 10.0ml (138.7mmol) of acetyl chloride into the system using a dropping funnel, and react overnight in an ice-water bath. Add an appropriate amount of 1mol / L dilute HCl to the crude product dropwise to remove unreacted pyridine and DMAP, then use saturated NaCl and ethyl acetate solution to extract and separate three times, take the upper organic phase with anhydrous MgSO 4 After drying for 2 hours, the target product was obtained after the ethyl acetate was removed with a rotary evaporator. The yield was 92% and the grafting rate was 9...

Example Embodiment

[0048] Example 2

[0049] Preparation of hyperbranched polymer with n-octanoyl end group and as an additive for electrospinning:

[0050] 1) Preparation of n-octanoyl chloride:

[0051]

[0052] Under anhydrous conditions, add 2.2ml (13.9mmol) n-octanoic acid) and 2.0ml (27.8mmol) thionyl dichloride to the Schlenk bottle according to a certain stoichiometric ratio. Under nitrogen protection, reflux and condense at 70~75℃ After 2h, the excess thionyl chloride was removed with a rotary evaporator to obtain a light yellow transparent liquid called n-octanoyl chloride with a yield of 95%.

[0053] 2) Synthesis of H20 n-octanoate

[0054]

[0055] Under anhydrous and oxygen-free conditions, add 2.0g (1.2mmol) of H20 and 0.06g of 4-dimethylaminopyridine (DMAP) to the Schlenk bottle in a certain stoichiometric ratio (3~4 relative to the mass fraction of H20). %), 4.5ml (56.2mmol) pyridine as a catalyst, 15ml tetrahydrofuran as a solvent, slowly drip 10.0ml (56.2mmol) n-octanoyl chloride into...

Example Embodiment

[0058] Example 3

[0059] Synthesis of H20 perfluorooctanoate and as spinning additive:

[0060] 1) Synthesis of perfluorooctanoyl chloride:

[0061]

[0062] The preparation of perfluorooctanoyl chloride (PFOC) is to add 10g (0.024mmol) perfluorooctanoic acid, 5.7g (0.048mmol) thionyl chloride and a small amount of DMF (0.5) into a Schlenk bottle in a certain stoichiometric ratio under anhydrous conditions. ml) as a catalyst, under the protection of nitrogen, reflux and condense at 70-75℃ for 2h. Place the obtained crude product in a separatory funnel to stand still for layering, the upper layer is yellow liquid, and the lower layer is white liquid. Remove the white liquid with a strong pungent smell. Afterwards, the excess thionyl chloride was removed with a rotary evaporator to obtain a colorless and transparent liquid called perfluorooctanoyl chloride with a yield of 97.0%.

[0063] 2) Synthesis of H20 perfluorooctanoate:

[0064]

[0065] Under anhydrous and anaerobic condition...

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Abstract

The invention relates to a preparation method of super-branched polyester as well as application in high-speed electrostatic spinning thereof. The adopted preparation route is to carry out acyl halogenation or direct esterification on H2O. After the super-branched polyester is applied to a high-speed electrostatic spinning solution, the critical spinning concentration and the spinning quality of the spinning solution are greatly improved, and the problems of winding and stranding in the spinning process are effectively solved.

Description

technical field [0001] The invention relates to a hyperbranched polyester and a preparation method thereof, and the application of the hyperbranched polyester to high-speed stretching electrospinning to improve and enhance the spinning quality. Background technique [0002] Electrospinning technology was proposed by Formhals et al. as early as 1934. In a series of patent applications, he invented an experimental device for preparing polymer fibers by electrostatic force (such as figure 1 ). In 1971, Baumgarten produced polyacrylonitrile fibers using electrospinning technology. So far, the electrospinning method has been able to spin more than 50 different polymers, such as polyester, polyurethane, polyethylene, polypropylene, polyvinyl alcohol, polyaniline, polyacrylonitrile, etc., into diameters ranging from less than Ultrafine fibers ranging from 3nm to more than 1μm, the resulting electrospun fibers are collected on the negative plate and deposited into a non-woven fab...

Claims

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Application Information

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IPC IPC(8): C08G63/91C08G63/66C08G63/682D01F1/10
Inventor 景浩胡爱国魏伟
Owner EAST CHINA UNIV OF SCI & TECH
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