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Special polypropylene filament needle-punched drainage geotechnical cloth for tunnels, preparation method and preparation system

A polypropylene, soil-draining technology, used in needle punching machines, stretch spinning, non-woven fabrics, etc., can solve the problems of poor mechanical properties, hydraulic properties and chemical resistance of non-woven fabrics, loss of protective geomembrane It is difficult to achieve problems such as water permeability and drainage, and achieve good hydraulic performance, good drainage capacity and water permeability, and the effect of reducing monofilament breakage.

Active Publication Date: 2021-05-28
TIANDINGFENG POLYPROPYLENE MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a special polypropylene filament needle-punched drainage geotextile for tunnels, a preparation method and a preparation system. The conventional nonwoven fabric has poor mechanical properties, hydraulic properties and chemical resistance, and it is difficult to achieve the functions of water permeability and drainage, and loses the function of protecting geomembrane panels, which affects the technical problems of project life.

Method used

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  • Special polypropylene filament needle-punched drainage geotechnical cloth for tunnels, preparation method and preparation system
  • Special polypropylene filament needle-punched drainage geotechnical cloth for tunnels, preparation method and preparation system
  • Special polypropylene filament needle-punched drainage geotechnical cloth for tunnels, preparation method and preparation system

Examples

Experimental program
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Effect test

preparation example Construction

[0033] Such as figure 1 As shown, this embodiment provides a method for preparing a polypropylene filament needle-punched drainage geotextile for tunnels, including the following steps:

[0034] S1) preparing polypropylene fibers by melt spinning process;

[0035] S2) Pulling and stretching the polypropylene fiber by using at least three traction devices arranged in sequence at intervals to obtain stretched fibers, wherein the traction speeds of the sequentially arranged traction devices increase sequentially, and the fineness of the fibers is 13-16 dtex;

[0036] S3) After the stretched fibers are sequentially processed by an air-flow swing wire laying process, a lubrication reinforcement process and a tentering shaping process, a polypropylene filament needle-punched drainage geotextile is obtained.

[0037] Specifically, the pulling speed of the pulling device is 100-2000m / min.

[0038] Specifically, it includes arranging seven traction devices in sequence; the increasing...

Embodiment 1

[0056] Sample 1 preparation process is as follows: comprise the following steps:

[0057] 101) preparing polypropylene fibers by melt spinning process;

[0058] 102) Pulling and stretching polypropylene fibers by using seven sequentially arranged traction devices at intervals to obtain stretched fibers, wherein the increasing multiples of the traction speeds of the sequentially arranged traction devices decrease successively, and the fineness of the stretched fibers The degree is 15dtex;

[0059] Among them, seven traction devices are arranged in sequence, the traction speed of the first traction device, the second traction device, the third traction device, the fourth traction device, the fifth traction device, the sixth traction device and the seventh traction device is 100m / min, 400m / min, 800m / min, 1200m / min, 1600m / min, 2000m / min and 1950m / min; the temperature of the drafting rollers of the seven drawing devices is 120°C, 120°C, 120°C, 130°C, 130°C ℃, 130℃, 80℃;

[0060...

Embodiment 2

[0074] Sample 4, sample 5 and sample 6 described in the present invention are improvements on the basis of Example 1. The technical content disclosed in Example 1 will not be described repeatedly, and the content disclosed in Example 1 also belongs to the content disclosed in this Example.

[0075] Prepare sample 4, sample 4 only changes the concentration of lubricant added, the concentration of lubricant is 0g / L, the performance of the obtained geotextile is shown in Table 2.

[0076] Prepare sample 5, sample 5 only changes the concentration of lubricant added, the concentration of lubricant is 5g / L, the properties of the obtained geotextile are shown in Table 2.

[0077] Prepare sample 6, sample 6 only changes the concentration of lubricant added, the concentration of lubricant is 15g / L, the properties of the obtained geotextile are shown in Table 2.

[0078] Sample 4, Sample 5 and Sample 6 are based on Example 1, only changing the concentration of the lubricant, and it is f...

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Abstract

The invention aims to provide special polypropylene filament needle-punched drainage geotechnical cloth for tunnels, a preparation method and a preparation system. The preparation method comprises the following steps: preparing polypropylene fibers by adopting a melt spinning process; adopting at least three traction devices which are sequentially arranged at intervals for conducting traction stretching on the polypropylene fibers, and thus obtaining stretched fibers, wherein the traction speeds of the sequentially arranged traction devices are sequentially increased, and the fineness of the fibers ranges from 13 dtex to 16 dtex; sequentially carrying out a yarn swaying and lapping process, a lubricating and reinforcing process and a tentering and setting process on the stretched fibers, and then obtaining the polypropylene filament needle-punched drainage geotechnical cloth. Through the design of the preparation method of the polypropylene filament needle-punched drainage geotechnical cloth, the technical problems that in the prior art, conventional non-woven cloth is poor in mechanical property, hydraulic property and chemical resistance, water permeation and drainage effects are difficult to achieve, the effect of protecting a geomembrane plate is lost, and the engineering life is affected are solved.

Description

technical field [0001] The invention relates to the technical field of geotextile preparation, in particular to a polypropylene filament needle-punched drainage geotextile for tunnels, a preparation method and a preparation system. Background technique [0002] Tunnel engineering has strict requirements on waterproofing. If water leaks in the tunnel, it will not only reduce the durability of the lining concrete, but also reduce the functions of various facilities in the tunnel and deteriorate the environment in the tunnel. When tunnels are excavated in mountains or strata with complex hydrogeology, in order to prevent groundwater from seeping into the cave, geotechnical templates and non-woven fabrics are often laid between the primary support and the secondary lining. The non-woven fabrics can protect the geotechnical templates from being pierced. Breaking, eliminating the role of groundwater infiltrating the initial support concrete. [0003] Conventional non-woven fabric...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H3/007D04H3/105D01D5/16D04H3/02D06C7/02D06C3/00D04H18/02D06B1/00
CPCD04H3/007D04H3/105D01D5/16D04H3/02D06C7/02D06C3/00D04H18/02D06B1/00
Inventor 聂松林镇垒孙丰华
Owner TIANDINGFENG POLYPROPYLENE MATERIAL CO LTD
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