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Method for preparing sound-absorbing and heat-insulating materials formed by superfine fiber nonwovens

A technology of ultra-fine fiber and non-woven fabrics, applied in the field of non-woven fabrics, can solve the problem of electrospun ultra-fine polyacrylonitrile fiber sound absorption, warmth, heat insulation, which cannot meet the requirements of industrial applications, and the output of electrospinning technology Small and other problems, to achieve the effect of easy industrial implementation, stable and reliable product quality, and good sound absorption and heat insulation performance

Inactive Publication Date: 2011-07-13
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, electrospinning technology has problems such as small output, high energy consumption, high production cost, and low production efficiency, which is far from meeting the requirements of industrial applications, which seriously affects its popularization and application.
Within the scope of the applicant's search, there is no research report on the use of electrospun ultrafine polyacrylonitrile fibers for sound absorption, warmth retention, and heat insulation

Method used

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  • Method for preparing sound-absorbing and heat-insulating materials formed by superfine fiber nonwovens
  • Method for preparing sound-absorbing and heat-insulating materials formed by superfine fiber nonwovens
  • Method for preparing sound-absorbing and heat-insulating materials formed by superfine fiber nonwovens

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preparation example Construction

[0014] The preparation method of the superfine fiber nonwoven fabric sound-absorbing and heat-insulating material designed by the present invention (referred to as the preparation method, see figure 1 , 2 ), the process steps are as follows: dissolve polyacrylonitrile in a solvent to form a spinning solution, and then supply the spinning solution to a spinning die 1 containing a series of spinneret holes through a supply device, so that the spinning solution Extrude from the spinning hole 11 of the die 1 to form a fine stream of spinning solution; at the same time, at least one high-speed jet stream heated by an air heater enters the spinning die 1 and passes through the air gap 12 of the spinning die 1 With a spray angle of 15-60 degrees (see attached figure 2 The angle between the A direction and the B direction) is blown toward the extruded spinning solution trickle; the high-speed jet airflow realizes the stretching and refinement of the spinning solution trickle while acce...

Embodiment 1

[0026] Dissolve polyacrylonitrile with a viscosity-average molecular weight of 90,000 into N,N-dimethylformamide in a ratio of 32% by mass, and stir until the mixture is uniform to form a spinning solution; the spinning solution is transported through a metering pump The tube is supplied to the spinning die 1 at a supply rate of 200mL / min and extruded from the spinneret 11; at the same time, a high-speed jet stream with a temperature of 30℃ is ejected from the air gap 12. The wind speed at the outlet of the air gap 12 It is 2400m / min, and the ratio of the jet velocity of the high-speed jet airflow at the outlet to the solution extrusion speed is 2800 times; polyacrylonitrile forms ultrafine fibers in the drying chamber under the action of the high-speed jet airflow, and is collected on the porous mesh curtain. Form a polyacrylonitrile superfine fiber net, export through the net curtain, and cross-lay the net to obtain 80g / m 2 The material of the present invention.

[0027] After ...

Embodiment 2

[0029] Dissolve acrylonitrile-methyl methacrylate copolymer with a viscosity average molecular weight of 150,000 (molar ratio of comonomers 80:20) into N,N-dimethylacetamide at a mass fraction of 25%, and stir until mixed Evenly, make spinning solution. The spinning solution is supplied to the spinneret through a delivery pipe via a metering pump at a supply rate of 120mL / min and extruded from the spinneret 11; at the same time, a high-speed jet air stream with a temperature of 90℃ is ejected from the air gap 12. The wind speed at the outlet of the gap 12 is 6800m / min, and the ratio of the jet velocity of the high-speed jet airflow at the outlet to the solution extrusion speed is about 8000 times; polyacrylonitrile forms ultrafine fibers in the drying chamber under the action of the high-speed jet airflow, and Collected on the porous mesh curtain to form a polyacrylonitrile ultrafine fiber mesh, which is exported through the mesh curtain and cross-laid to obtain 210g / m 2 The ma...

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Abstract

The invention discloses a method for preparing sound-absorbing and heat-insulating materials formed by superfine fiber nonwovens. The method comprises the following steps: dissolving polyacrylonitrile in a solvent to form spinning solution, supplying the spinning solution to a spinning die head containing a series of spinneret orifices via a supply device and extruding the spinning solution out of the spinneret orifices of the spinning die head to form spinning solution trickles; simultaneously at least a high-speed jet stream heated by an air heater entering into the spinning die head and blowing the extruded spinning solution trickles via the air gaps on the spinning die head at a jet angle of 15-60 degrees; realizing drawing and thinning of the spinning solution trickles and simultaneously accelerating volatilization of the solvent in the spinning solution to form superfine fibers; collecting the superfine fibers on the web curtain by utilizing the high-speed jet stream and suction stream to form webs, thus forming the sound-absorbing and heat-insulating materials formed by polyacrylonitrile superfine fiber nonwovens; and lapping the formed sound-absorbing and heat-insulating materials formed by polyacrylonitrile superfine fiber nonwovens on multiple layers according to the design requirements.

Description

Technical field [0001] The invention relates to non-woven fabric technology, in particular to a preparation method of superfine fiber non-woven fabric sound-absorbing and heat-insulating material. Background technique [0002] As we all know, sound-absorbing and heat-insulating materials have the functions of calming the environment, reducing noise pollution, inhibiting the flow of heat, and maintaining the environment and human body temperature. [0003] Non-woven fabric is a textile made of oriented or messy fiber web. Due to the large number of pores in fiber aggregation, non-woven fabrics have good sound absorption, heat insulation and warmth performance, and have been widely used in automotive interiors, construction materials, clothing and other fields. [0004] At present, there are mainly two types of processing methods for non-woven fabrics used for sound absorption, heat insulation and warmth. One type of method is the dry non-woven process, that is, the non-woven fabric i...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H3/00D01D5/04D01F6/18D01F6/40
Inventor 程博闻庄旭品焦晓宁康卫民关克田
Owner TIANJIN POLYTECHNIC UNIV
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