Polyester, resin composition, melt-blown fiber, composite melt-blown fiber, composite sheet, filter screen and sound insulation material

A technology of melt-blown fiber and polyester, which is applied in the fields of polyester, resin composition, melt-blown fiber, composite melt-blown fiber, composite sheet, filter screen and sound insulation materials, and can solve the problem of losing fluidity and inability to produce melt-blown fiber and other problems, to achieve the effects of concentrated diameter distribution, small diameter size, high fluidity and stability

Active Publication Date: 2021-06-11
CHANG CHUN PLASTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These polyesters gradually lose their fluidity over time and therefore cannot produce meltblown fibers with a concentrated diameter distribution

Method used

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  • Polyester, resin composition, melt-blown fiber, composite melt-blown fiber, composite sheet, filter screen and sound insulation material
  • Polyester, resin composition, melt-blown fiber, composite melt-blown fiber, composite sheet, filter screen and sound insulation material
  • Polyester, resin composition, melt-blown fiber, composite melt-blown fiber, composite sheet, filter screen and sound insulation material

Examples

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Embodiment

[0085] Usually, prepare a feed, this feed comprises a mixture and a paste, and this mixture mixes catalyst (such as titanium-based catalyst) and BDO under the temperature 120-140 ℃, and its titanium content is 50-120ppm, and this paste At a temperature of 60-80°C, purified PTA and BDO in a molar ratio of 1:1.1 to 1:1.4 are fed into the vessel 100, and the first step of esterification reaction is carried out at a temperature of 235-245°C and an absolute pressure of 900mbar 1 - 1.5 hours to bring the CEG content in the reaction mixture to less than 300 meq / kg. The second step of esterification is carried out at a temperature of 235-245° C. and an absolute pressure of 400-450 mbar for 0.3-0.8 hours, so that the CEG content in the reaction mixture is less than 50 meq / kg. Subsequently, prepolymerization and condensation are carried out at a temperature of 240-250°C and a pressure of 15-25mbar for 30-45 minutes to form a prepolymer with an intrinsic viscosity (IV) of 0.21-0.33dL / g a...

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Abstract

The invention provides a polyester, a resin composition, a melt-blown fiber, a composite melt-blown fiber, a composite sheet, a filter screen and a sound insulation material. The polyester has ultra-high flowability and good long-term stability. The polyester can be polybutylene terephthalate (PBT) or another aliphatic polyester or aromatic polyester, whose intrinsic viscosity (IV) is less than 0.6 dL/g and a carboxylic end group (CEG) content is 15 meq/kg or less, and characterized by having a melt volume rate (MVR) of greater than 400 cm3/10 min at 250 DEG C. A resin composition of this polyester is provided, which can be melt-blown into microfibers of a uniform diameter and a concentrated diameter distribution, forming a fabric with a uniform small pore size.

Description

technical field [0001] The present invention relates to polyesters with improved properties that can be processed into uniform fine fibers for use in various industries. Background technique [0002] In the meltblowing process, a nonwoven web is formed by extruding molten polymer through a die and attenuating the resulting filaments through a high temperature and high velocity air stream. Fibers from this process are collected on a conveyor belt, where they may bond to each other as they cool on the conveyor belt, creating a web with barrier properties. [0003] Meltblown fibers are typically made from polyester, polypropylene, polyethylene, polyamide and polyurethane. Commonly used polyester polymers are not suitable for making fine meltblown fibers. For example, commonly used polybutyleneterephthalate (PBT) crystallizes rapidly, usually resulting in short molding cycles and relatively brittle fiber webs. However, improving flow is effective in making finer fibers. In t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183C08G63/78D01F6/84D01D1/09D01D5/08D04H3/011D04H3/16B01D39/16
CPCC08G63/183C08G63/78D01F6/84D01D5/08D01D1/09D04H3/011D04H3/16B01D39/1623D04H1/435D04H1/56B01J19/0066B01J19/1812B01J4/008B01J2219/00168B01J2219/00202B01J2219/00207D01F6/62C08G2350/00D01D5/0985G10K11/162
Inventor 薛博帆黄才榜林永昇
Owner CHANG CHUN PLASTICS
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