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Nonwoven and yarn polypropylene with additivation

A polypropylene, non-woven fabric technology, applied in the field of fibers or yarns, can solve the problems of non-stable production process spinning speed, narrow thermal bonding window, narrow melting range, etc.

Active Publication Date: 2013-08-07
鲁姆斯诺沃伦技术公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the disadvantage of Ziegler-Natta polypropylene is that high tension is required to draw its fibers, and its extensional viscosity will decrease significantly at higher spinning speeds, resulting in unstable production process conditions.
Metallocene polypropylene also exhibits a drop in extensional viscosity at very high spinning speeds (but less than that of Ziegler-Natta polypropylene), which also leads to unsteady process conditions (but less than that of Ziegler-Natta polypropylene). Grenata polypropylene requires higher spinning speed)
A further disadvantage, especially for metallocene polypropylene, is its narrow melting range, which gives it a narrow thermal bonding window, which limits the speed of the entire nonwoven fabric formation process and affects the ability to obtain higher nonwoven fabric tensile strength. Best spunbond process for strength achieved

Method used

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  • Nonwoven and yarn polypropylene with additivation
  • Nonwoven and yarn polypropylene with additivation
  • Nonwoven and yarn polypropylene with additivation

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0054] Example 1 - Melting Properties

[0055] sample 1

[0056] A metallocene polypropylene (mPP), catalyzed by a metallocene catalyst (MCCA013) and having a melt flow rate of about 30 g / 10 min (ISO1133, 230 degrees Celsius, under a weight of 2.16 kg), was formed with β The nucleating agent N',N'-dicyclohexyl-2,6-phthalamide (which can be purchased from RIKA company under the product name of NJ-Star NU--100) was blended at a load of 300 ppm. Detection using Rheotens (applied from Rheotens model 71.97 extensional viscometer) to obtain the strain rate versus elongational viscosity curve (single fiber extraction wheel speed of Rheotens detection equipment). Rheotens detection is implemented in the following way. The Rheotens experiment continuously extruded polymer strands from a mouth mill measuring 30mm in length and 2mm in diameter, which were then picked up by the take-up reels of the Rheotens machine. The distance between the mouth mill outlet and the tip of the Rheote...

example 2

[0062] Example 2 - Spinning Test

[0063] Sample 4

[0064] The mPP and β-nucleating agents involved in sample 1 were tested in a high-speed spinning process (using the Foumé laboratory of Foumé Polymer Technologies GmbH and the Pilot Spintester spinning process) to also determine the β-nucleated polypropylene. Maximum spinning speed. The polymer is melted in an extruder at a temperature between 220°C and 230°C. The molten polymer was extruded from 18 dies with a diameter of 0.25 mm and an L / D ratio of 2. The monofilaments from the spinneret are then collected on the winding godet which guides them through a second guide rail to the winder and the final yarn is wound on his mandrel core. The adjustable speed winding godet determines the spinning speed of the fiber. The maximum spinning speed is reached when the fibers start to break. The test results are listed in Table 1.

[0065] Sample 5

[0066]The mPP blended with a beta-nucleating agent involved in sample 2 was te...

example 4

[0079] Example 4 - Spunbonded nonwoven fabric test

[0080] sample 14

[0081] A metallocene polypropylene (mPP), catalyzed by a metallocene catalyst (MCC A013) and having a melt flow rate (ISO1133, 230 degrees Celsius, under 2.16 kg weight) of about 40 g / 10 min, was combined with β-type The nucleating agent N',N'-dicyclohexyl-2,6-phthalamide (available from RIKA under the product name NJ-Star NU-100) was blended at a load of 500 ppm. Its spinning characteristics were measured under a high-speed spunbond nonwoven fabric production process (Reicofil Model 4 spunbond process), as Figure three shown. The spunbond nonwoven process is equipped with a spinneret with about 7000 holes / m and a diameter of 0.7mm per hole. The polymer resin is melted in an extruder at 240°C and extruded through a die into fibers. Thin fibers are finished in high-speed air flow, and the air flow rate can be adjusted by the air pressure in the spinning chamber. The greater the pressure difference, th...

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Abstract

A process to produce improved polypropylene nonwovens or yarns by extruding a mixture of polypropylene(s) and beta nucleating agent(s), or in the alternative, certain clarifiers, to form the improved polypropylene filaments.

Description

technical field [0001] The present invention is mainly concerned with processing a mixture of polypropylene and beta-type nucleating agent into fibers or yarns under selected process conditions using a thermal bonding process and a fluffy filament process. Background technique [0002] Nonwoven structures or fabrics are typically constructed from individual fibers or threads that are not layered together in a known fashion to produce a web or fabric. Nonwoven webs can be produced from polymeric strands by a number of methods known in the art, such as spunbonding, meltblowing. Lofty filament structures or fabrics are larger bundles of fibers composed of individual fibers or threads. [0003] Examples of various types of spunbond processes are in U.S Pat. No. 3,338,992 to Kinney, U.S Pat. No. 3,692,613 to Dorscher, U.S Pat. No. 3,802,817 to Matsuki, U.S Pat. No. 4,405,297 to Appel, U.S Pat. No. 4,812,112 to Balk, and U.S Pat. No. 5,665,300 to Brignola et al., both incorporat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/098D01F1/02D01F6/06D04H1/4291D04H3/007
CPCD04H3/007D01F1/02D01F6/06D02G3/24D04H1/4291D01D5/098
Inventor 曼弗雷德·维特纳
Owner 鲁姆斯诺沃伦技术公司