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Preparation method and application of PET melt-blown non-woven fabric of gradient structure for secondary molding filtration of double-rolling mill

A melt-blown non-woven fabric, gradient structure technology, applied in separation methods, filtration separation, chemical instruments and methods, etc., can solve the problems of reducing the tear strength of materials, reducing the filtration accuracy of materials, and reducing the ability of materials to hold dirt, etc. Improve water/air pressure resistance, ensure filtration efficiency, and long service life

Active Publication Date: 2019-01-08
SHANDONG TAIPENG ENVIRONMENTAL PROTECTION MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the larger pore size reduces the filtration accuracy of the material; on the other hand, the higher the thermal bonding temperature and the greater the pressure, the more favorable it is to obtain a smaller pore size and improve the filtration accuracy, but it destroys the single fiber The structure in turn reduces the tear strength of the material, and the smaller pore size also reduces the dirt-holding capacity of the material

Method used

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  • Preparation method and application of PET melt-blown non-woven fabric of gradient structure for secondary molding filtration of double-rolling mill
  • Preparation method and application of PET melt-blown non-woven fabric of gradient structure for secondary molding filtration of double-rolling mill
  • Preparation method and application of PET melt-blown non-woven fabric of gradient structure for secondary molding filtration of double-rolling mill

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] According to the preparation steps of the above preparation method, firstly, PET chips with a viscosity of 0.45dl / g and a melting point of 265°C are pre-crystallized at 120°C for 30 minutes and fully dried at 160°C for 8 hours to obtain PET meltblown fibers by melt blown method , and then use hot air at 0.2MPa and 340°C for drafting to obtain PET melt-blown fiber web; pass the fiber web through a 130°C, 70N primary flat roll mill and a 220°C, 20N secondary flat roll mill to obtain PET melt-blown non-woven fabric. The fiber fineness of PET melt-blown non-woven fabric is 0.25D, and the weight range is 50g / m 2 , the thickness is 0.4mm. The thickness of the internal loose macroporous structure of PET meltblown non-woven fabric is 0.24mm, the pore diameter ranges from 20μm to 25μm, and the thickness of the external dense small pore structure is 0.08mm, and the pore diameter ranges from 3μm to 5μm.

Embodiment 2

[0043] PET chips with a viscosity of 0.45dl / g and a melting point of 265°C are pre-crystallized and fully dried to obtain a PET melt-blown fiber web, and the fiber web is passed through a 140°C, 80N primary flat roll mill and a 220°C, 30N The second flat roll mill obtains PET melt-blown nonwovens with gradient structure. The fiber fineness of PET melt-blown non-woven fabric is 0.25D, and the weight range is 70g / m 2 , the thickness is 0.45mm. The pore diameter range of the internal loose macroporous structure of PET melt-blown non-woven fabric is 17 μm to 20 μm, and the pore diameter range of the external dense small pore structure is 3 μm to 5 μm.

Embodiment 3

[0047]PET chips with a viscosity of 0.4dl / g and a melting point of 265°C are pre-crystallized and fully dried to obtain a PET melt-blown fiber web, and the fiber web is passed through a 140°C, 85N primary flat roll mill and a 230°C, 40N The second flat roll mill obtains PET melt-blown nonwovens with gradient structure. The fiber fineness of PET melt-blown non-woven fabric is 0.35D, and the weight range is 90g / m 2 , the thickness is 0.5mm. The thickness of the internal loose macroporous structure of PET meltblown non-woven fabric is 0.3mm, the pore diameter ranges from 20μm to 25μm, and the thickness of the external dense small pore structure is 0.1mm, and the pore diameter ranges from 5μm to 7μm.

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Abstract

The invention relates to a preparation method and application of PET melt-blown non-woven fabric of a gradient structure for the secondary molding filtration of a double-rolling mill. The method comprises a step of preparing a PET melt-blown fiber layer, allowing the obtained fiber layer to pass a hot rolling mill to subjected to first complete thermal bonding at the temperature of 120 DEG C to 160 DEG C and the pressure of 30N to 60 N, a step of allowing the fiber layer to pass the hot rolling mill to subjected to second non-complete thermal bonding at the temperature of 200 to 240 DEG C andthe pressure of 40N to 100N to obtain the PET melt-blown non-woven fabric of the gradient structure. The obtained PET melt-blown non-woven fabric is applied to liquid / gas filtration and has the advantages of large air permeability, high filtration precision, small pressure drop and long service life.

Description

technical field [0001] The invention relates to the technical field of melt-blown non-woven fabrics, in particular to a preparation method and application of a gradient-structure PET melt-blown non-woven fabric for secondary molding and filtration by double rolling mills. Background technique [0002] The current PET melt-blown non-woven fabrics mostly use high-temperature and high-pressure one-time thermal bonding technology, and the pore size distribution range is narrow. When filtering, most of the particles are intercepted on the surface of the filter layer, and the surface voids are easily filled. However, the internal voids are not effectively utilized, and the pressure rises rapidly during the filtration process, which makes the filter material unable to fully play its role and reduces the dirt-holding capacity of the material. [0003] In addition, the one-time thermal bonding technology determines that high filtration accuracy, high dirt holding capacity and high te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/55D04H1/56B01D39/08
CPCB01D39/083D04H1/55D04H1/565
Inventor 朱绍存王海平于培杨会敏褚菲菲刘利防王绪华张静张泉城张书振程翠翠
Owner SHANDONG TAIPENG ENVIRONMENTAL PROTECTION MATERIAL
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