Application of improved PP (polypropylene) to melt-blown fabric

A melt-blown cloth and melt technology, which is applied in the directions of non-woven fabrics, melt spinning, spinneret assemblies, etc., can solve problems such as difficult to buy, and achieve the effect of blocking viruses

Pending Publication Date: 2020-11-20
YANGXIN JINFENG ECOLOGICAL FIBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The commonly used melt-blown grade PP is basically supplied to large factories, and it is difficult to buy in the market. The demand for masks for the environment is increasing, so the ordinary PP raw materials are modified. Therefore, a medical mask is designed to meet the environmental requirements. It is necessary to filter the virus

Method used

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 of improved PP (polypropylene) to melt-blown fabric
  • Application of improved PP (polypropylene) to melt-blown fabric
  • Application of improved PP (polypropylene) to melt-blown fabric

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] As a preferred embodiment, the extruder is composed of a transmission, a feeding device, a barrel, a screw, a head and a die, and the extruder is divided into a solid delivery zone, a melting zone and a melt delivery zone; Step 1 The compound in the process is mixed with a high-speed rotary mixer, so that the melt is mixed and mixed, and then enters the extruder for melting to complete the melt feeding and discharging operations.

Embodiment 2

[0043] As a preferred embodiment, the diameter of the screw gradually increases from the fixed conveying area to the melt conveying area, and the aspect ratio of the screw is greater than 28, so that the melt has a certain reflux when the screw is extruded, which plays a role in mixing. The heating uniformity will be improved.

Embodiment 3

[0045] As a preferred embodiment, the melting die head assembly 1 includes a polymer distribution system, a die head system, a drafting hot air pipeline channel 3 and a heating and heat preservation element 4, at the same temperature, screw speed and receiving distance (DCD) Under the same conditions, the faster the hot air speed, the smaller the fiber diameter, the softer the non-woven fabric will gradually become, and the more fibers will be entangled, resulting in a denser and smoother fiber web with increased strength, allowing the melt to complete the melt-blown process. So that the improved PP has 35% filtration performance.

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Abstract

The invention discloses application of improved PP (polypropylene) to melt-blown fabric, and relates to the technical field of the melt-blown fabric. The application is characterized by comprising steps as follows: 96%-98% of PP resin, 0.1%-0.2% of a free radical initiator, 0.2% of a lubricating agent, 0.01%-0.03% of an antioxidant and 0-1.5% of a compound transparent nucleating agent are preparedand mixed to form a polymer melt; the polymer melt in step 1 is subjected to melt index MFR (melt mass flow rate) testing treatment, and the MFR of the polymer melt is enabled to be 300-1,900 g / 10 min; and then the polymer melt is injected from a feeding port of an extruder, and is conveyed to a melting die head assembly through a melt conveying area of the extruder. According to the applicationof improved PP to the melt-blown fabric, melt extrusion, melt-blowing process and electret treatment are carried out in sequence, the melt index MFR testing method is utilized, so that the prepared melt meets the requirement of a special material for melt-blowing, then by means of treatment with the melt-blowing process, improved PP has 35% filtering performance, the filtering performance can be improved to 95% after the electret treatment, and with adoption of the electret treatment method, under the condition of no change of respiratory resistance, 95% filtering effect is realized and viruses are effectively isolated.

Description

technical field [0001] The invention relates to the technical field of melt-blown cloth, in particular to the application of an improved PP in melt-blown cloth. Background technique [0002] Melt-blown cloth is the core material of masks. Melt-blown cloth mainly uses polypropylene as the main raw material. The fiber diameter can reach 1-5 microns. It has many voids, fluffy structure, good wrinkle resistance, and ultra-fine fibers with unique capillary structure. Increase the number and surface area of ​​fibers per unit area, so that the melt blown cloth has good filterability, shielding, heat insulation and oil absorption, and can be used for air, liquid filter materials, isolation materials, absorption materials, mask materials, thermal insulation materials, In the fields of oil-absorbing materials and wiping cloths, medical masks and N95 masks are composed of spunbond layer, meltblown layer and spunbond layer, among which the spunbond layer and meltblown layer are all comp...

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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IPC IPC(8): D06M10/02D01F6/46D01F1/10D01D4/02D01D5/098D04H1/544D04H3/007D04H3/14
CPCD06M10/025D01F6/46D01F1/10D01D5/0985D01D4/02D04H1/544D04H3/007D04H3/14Y02P70/62
Inventor 梁家彬
Owner YANGXIN JINFENG ECOLOGICAL FIBER CO LTD
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