A composite geotextile and preparation method thereof

Abstract

The present invention provides a composite geotextile, which includes a first protective layer, a reinforcement layer, a fabric base layer, an antibacterial layer and a second protective layer from top to bottom; the first protective layer, the reinforcement layer, the fabric base layer, the antibacterial layer and the second protective layer are tightly connected by viscose; the thickness ratio of the first protective layer, the reinforcement layer, the fabric base layer, the antibacterial layer and the second protective layer is 1: 0.8-1.0: 0.6-0.9: 1.3-1.8: 0.3-0.6: 1.2-1.5. By introducing the protective layer, the reinforcement layer and the antibacterial layer, and bonding the layers to form an integral composite geotextile, it has excellent tensile strength, deformation resistance, antibacterial and other properties.

Description

Technical Field

[0001] The invention belongs to the technical field of geotextile preparation, and specifically relates to a composite geotextile and a preparation method thereof. Background Art

[0002] Geotextile is also called geotextile. Geotextile is a water-permeable geosynthetic material made of synthetic fibers through needle punching or weaving. Geotextile is one of the new geosynthetics. The finished product is cloth-like, generally 4-6 meters wide and 50-100 meters long. Geotextile is divided into woven geotextile and non-woven filament geotextile. It has the function of efficient isolation and filtration, and plays an important role in various fields of modern civil engineering such as water conservancy, highways, railways, seaports, and construction.

[0003] Geotextile has a good bearing capacity, which can improve the tensile strength and deformation capacity of the soil, improve the stability of the building structure, and improve the quality of the soil. The concentrated stress is effectively diffused, transmitted or decomposed to prevent the soil from being damaged by external forces. At the same time, the needle-punched geotextile is a good water-conducting material that can form drainage ditches in the soil and remove excess liquid and gas from the soil structure; when water flows from the fine soil layer to the coarse soil layer, the needle-punched geotextile has good water permeability and water permeability, allowing the water to pass through and effectively retain particles, fine sand, pebbles, etc.

[0004] Polypropylene geotextile has high strength, excellent corrosion resistance, acid and alkali resistance, good low temperature resistance, good wicking effect and water permeability, especially in alkaline environment and high-cold areas. The disadvantage is that it is easy to age under the action of ultraviolet light, which limits its application field. In addition, the tensile strength and deformation resistance of existing geotextiles are low when they are used, and there is a lot of room for improvement. Summary of the invention

[0005] The purpose of the present invention is to provide a composite geotextile and a preparation method thereof in view of the deficiencies of geotextiles in the prior art in terms of strength, antibacterial and aging resistance. The composite geotextile is formed by introducing a protective layer, a reinforcing layer and an antibacterial layer, and bonding the layers to form an overall composite geotextile, so that the composite geotextile has excellent tensile strength, deformation resistance, antibacterial and other properties.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A composite geotextile comprises, from top to bottom, a first protective layer, a reinforcement layer, a fabric base layer, an antibacterial layer and a second protective layer; the first protective layer, the reinforcement layer, the fabric base layer, the antibacterial layer and the second protective layer are all tightly connected by viscose.

[0008] Preferably, the thickness ratio of the first protective layer, the reinforcing layer, the fabric base layer, the antibacterial layer and the second protective layer is 1: 0.8-1.0: 0.6-0.9: 1.3-1.8: 0.3-0.6: 1.2-1.5.

[0009] Preferably, the first protective layer and the second protective layer are modified basalt fiber layers; the reinforcement layer is a modified polyacrylonitrile-based carbon fiber layer; the cloth base layer is a polypropylene fiber layer; and the antibacterial layer is a modified polypropylene fiber layer.

[0010] The preparation method of the composite geotextile comprises the following steps:

[0011] S1: preparing a first protective layer and a second protective layer;

[0012] S2: preparing a reinforcement layer;

[0013] S3: preparing an antibacterial layer;

[0014] S4; bonding the second protective layer, the antibacterial layer, the fabric base layer, the reinforcement layer and the first protective layer in sequence from bottom to top by using an adhesive to form a composite geotextile blank;

[0015] S5: The composite geotextile blank obtained in step S4 is subjected to a tension frame to adjust the tension, and then enters a roll-up machine for edge trimming and roll-up to obtain the composite geotextile.

[0016] Preferably, the preparation process of the first protective layer in step S1 is as follows: in parts by weight, take 10-20 parts of basalt fiber layer, 3-6 parts of phenolic resin, 2-6 parts of ethylene glycol monobutyl ether and 0.3-0.6 parts of nano-silicon dioxide, and 0.5-1 parts of date palm powder, mix them at a temperature of 220-240°C for 3-6h to obtain a mixed material; extrude it at a temperature of 160-180°C, filter it, and spin it at a temperature of 240-260°C, control the needle density to 70-90 needles / cm2, and the needle depth to 10-15mm to obtain the first protective layer blank.

[0017] Preferably, the preparation process of the second protective layer in step S1 is as follows: in parts by weight, take 10-20 parts of basalt fiber layer, 3-6 parts of phenolic resin, 2-6 parts of ethylene glycol monobutyl ether and 0.3-0.6 parts of nano-silicon dioxide, and 0.5-1 parts of date palm powder, mix them at a temperature of 220-240°C for 3-6h to obtain a mixed material; extrude at a temperature of 160-180°C, filter, and spin at a temperature of 240-260°C, control the needle density to 60-70 needles / cm2, and the needle depth to 12-16mm to obtain the second protective layer blank.

[0018] Preferably, the preparation process of the reinforcement layer in step S2 is: take 15-25 parts of polyacrylonitrile-based carbon fiber, 5-10 parts of maleic acid, 2-5 parts of mica powder and 0.3-0.6 parts of lanthanum stearate, mix them at a temperature of 160-180°C for 1-4h; then extrude them at a temperature of 140-160°C, filter and spin them at a temperature of 210-230°C, control the needle density to 40-50 needles / cm2, and the needle depth to 8-10mm to obtain a reinforcement layer.

[0019] Preferably, the preparation process of the antibacterial layer in step S3 is: take 20-40 parts of polypropylene fiber, 2-5 parts of dodecyltrimethylammonium chloride, 0.5-1.5 parts of nano titanium dioxide and 1-3 parts of chitosan, mix them at a temperature of 150-170°C for 2-3h; then extrude them at a temperature of 135-145°C, filter and spin them at a temperature of 190-210°C, control the needle density to 35-45 needles / cm2, and the needle depth to 7-9mm to obtain the antibacterial layer.

[0020] Preferably, the specific process of step S4 is: according to the thickness ratio of 1: 0.8-1.0: 0.6-0.9: 1.3-1.8: 0.3-0.6: 1.2-1.5, the first protective layer, the reinforcement layer, the fabric base layer, the antibacterial layer and the second protective layer are connected to each other by adhesive in sequence to form a composite geotextile.

[0021] Preferably, the adhesive is a polyurethane adhesive.

[0022] Compared with the prior art, the advantages and beneficial effects of the present invention are:

[0023] The present invention prepares a first protective layer and a second protective layer with ingredients such as a basalt fiber layer, nano silicon dioxide, and date palm powder. Through the synergistic effect of the above ingredients, the mechanical properties and antioxidant properties of the composite geotextile are significantly improved; a reinforcement layer is prepared with ingredients such as polyacrylonitrile-based carbon fiber, mica powder, and lanthanum stearate, thereby improving the mechanical strength of the polyacrylonitrile-based carbon fiber, the shielding effect against ultraviolet rays, and the anti-aging performance; with polypropylene fiber as a matrix, an antibacterial layer with excellent effects is obtained under the synergistic effect of dodecyltrimethylammonium chloride, nano titanium dioxide, and chitosan; the first protective layer, the reinforcement layer, the cloth base layer, the antibacterial layer, and the second protective layer are connected to each other with an adhesive to finally form a composite geotextile with excellent strength, antibacterial properties, and aging resistance. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The sources of raw materials used in the present invention are as follows:

[0026] Basalt fiber comes from Shandong OUDE Chemical Fiber Products Co., Ltd., item number 23; phenolic resin comes from Beijing Zhisheng Weihua Chemical Co., Ltd., item number 4025; date palm powder comes from Jiangsu Weizhirun Biotechnology Co., Ltd., item number 3294; ​​polyacrylonitrile-based carbon fiber comes from Dongguan Nabaichuan Plastic Co., Ltd., item number 183 HI; maleic acid comes from Shanghai Yuanye Biotechnology Co., Ltd., item number S30016; lanthanum stearate comes from Wuhan Xingzhongcheng Technology Co., Ltd., item number 3428; polypropylene fiber comes from Foshan Ruisheng Plastic Co., Ltd., item number 62; chitosan comes from Shandong Haiyihua Biotechnology Co., Ltd., item number 51.

[0027] Example 1

[0028] The present invention provides a method for preparing a composite geotextile, comprising the following steps:

[0029] S1: 10g basalt fiber, 3g phenolic resin, 2g ethylene glycol monobutyl ether, 0.3g nano silicon dioxide and 0.5g date palm powder were mixed at 220°C for 3h to obtain a mixed material; the mixed material was extruded at 160°C, filtered and spun at 240°C. The needle density was controlled to be 70 needles / cm 2 The first protective layer blank is obtained by acupuncture depth of 10 mm; the acupuncture density is controlled to be 60 needles / cm 2 , the needling depth is 12 mm to obtain the second protective layer blank;

[0030] S2: 15g polyacrylonitrile-based carbon fiber, 5g maleic acid, 2g mica powder and 0.3g lanthanum stearate were mixed at 160°C for 1h; then extruded at 1400°C, filtered and spun at 210°C, with a needle density of 40 needles / cm 2 , the needle puncture depth is 8mm, and the reinforcement layer is obtained;

[0031] S3: 20g polypropylene fiber, 2g dodecyltrimethylammonium chloride, 0.5g nano titanium dioxide and 1g chitosan were mixed at 150°C for 2h; then extruded at 135°C, filtered and spun at 190°C, with a needle density of 35 needles / cm 2 , the needle puncture depth is 7mm, and the antibacterial layer is obtained;

[0032] S4: connecting the first protective layer, the reinforcement layer, the fabric base layer, the antibacterial layer and the second protective layer to each other in sequence by adhesive according to a thickness ratio of 1:0.8:0.6:1.3:0.3:1.2 to form a composite geotextile blank;

[0033] S5: The composite geotextile blank obtained in step S4 is subjected to a tension frame to adjust the tension, and then enters a roll-forming machine for edge trimming and roll-forming, thereby obtaining the composite geotextile.

[0034] Example 2

[0035] The present invention provides a method for preparing a composite geotextile, comprising the following steps:

[0036] S1: 20g basalt fiber, 6g phenolic resin, 6g ethylene glycol monobutyl ether, 0.6g nano silicon dioxide and 1g date palm powder were mixed at 240°C for 6h to obtain a mixed material; the mixed material was extruded at 180°C, filtered and spun at 260°C. The needle density was controlled to be 90 needles / cm 2 The first protective layer blank is obtained by acupuncture depth of 15 mm; the acupuncture density is controlled to be 70 needles / cm 2 , the needling depth is 16 mm to obtain the second protective layer blank;

[0037] S2: 25g of polyacrylonitrile-based carbon fiber, 10g of maleic acid, 5g of mica powder and 0.6g of lanthanum stearate were mixed at 180°C for 4h; then extruded at 160°C, filtered and spun at 230°C, with a needle density of 50 needles / cm 2 , the needle puncture depth is 10 mm, and a reinforcement layer is obtained;

[0038] S3: 40g polypropylene fiber, 5g dodecyltrimethylammonium chloride, 1.5g nano titanium dioxide and 3g chitosan were mixed at 170°C for 3h; then extruded at 145°C, filtered and spun at 210°C, with a needle density of 45 needles / cm 2 , the needle puncture depth is 9 mm, and the antibacterial layer is obtained;

[0039] S4: connecting the first protective layer, the reinforcement layer, the base layer, the antibacterial layer and the second protective layer to each other in sequence by adhesive according to a thickness ratio of 1:1.0:0.9:1.8:0.6:1.5 to form a composite geotextile blank;

[0040] S5: The composite geotextile blank obtained in step S4 is subjected to a tension frame to adjust the tension, and then enters a roll-forming machine for edge trimming and roll-forming, thereby obtaining the composite geotextile.

[0041] Example 3

[0042] The present invention provides a method for preparing a composite geotextile, comprising the following steps:

[0043] S1: 16 g basalt fiber, 5 g phenolic resin, 4 g ethylene glycol monobutyl ether, 0.5 g nano silicon dioxide and 0.8 g date palm powder were mixed at 230°C for 4.5 h to obtain a mixed material; the mixed material was extruded at 175°C, filtered and spun at 250°C, with a needle density of 85 needles / cm 2 The first protective layer blank is obtained by acupuncture depth of 12 mm; the acupuncture density is controlled to be 65 needles / cm 2 , the needling depth is 14 mm to obtain the second protective layer blank;

[0044] S2: 22g of polyacrylonitrile-based carbon fiber, 8g of maleic acid, 4g of mica powder and 0.5g of lanthanum stearate were mixed at 170°C for 2.5h; then extruded at 155°C, filtered and spun at 220°C, with a needle density of 45 needles / cm 2 , the needle puncture depth is 9 mm, and a reinforcement layer is obtained;

[0045] S3: 25g polypropylene fiber, 3g dodecyltrimethylammonium chloride, 1.2g nano titanium dioxide and 2g chitosan were mixed at 160°C for 2.5h; then extruded at 142°C, filtered and spun at 205°C, with a needle density of 42 needles / cm 2 , the needle puncture depth is 8mm, and the antibacterial layer is obtained;

[0046] S4: connecting the first protective layer, the reinforcement layer, the base layer, the antibacterial layer and the second protective layer to each other in sequence by adhesive according to a thickness ratio of 1:0.9:0.8:1.5:0.5:1.4 to form a composite geotextile blank;

[0047] S5: The composite geotextile blank obtained in step S4 is subjected to a tension frame to adjust the tension, and then enters a roll-up machine for edge trimming and roll-up to obtain the composite geotextile.

[0048] Comparative Example 1

[0049] The difference between this comparative example and Example 1 is that no nano-silicon dioxide is added in step S1, and the other steps are the same.

[0050] Comparative Example 2

[0051] The difference between this comparative example and Example 1 is that no date palm powder is added in step S1, and the other steps are the same.

[0052] Comparative Example 3

[0053] The difference between this comparative example and Example 1 is that mica powder is not added in step S2, and the other steps are the same.

[0054] Comparative Example 4

[0055] The difference between this comparative example and Example 1 is that maleic acid and lanthanum stearate are not added in step S2, and the other steps are the same.

[0056] Comparative Example 5

[0057] The difference between this comparative example and Example 1 is that dodecyltrimethylammonium chloride is not added in step S3, and the other steps are the same.

[0058] Comparative Example 6

[0059] The difference between this comparative example and Example 1 is that nano titanium dioxide and chitosan are not added in step S3, and the other steps are the same.

[0060] Performance Test:

[0061] The radial breaking strength and latitudinal breaking strength of geotextiles were tested according to GB / T 24218.3-2010; the tearing strength / KN was tested according to GB / T 13763-1992; the CBR bursting strength / KN was tested according to GB / T 14800-1993; and the antibacterial property of Staphylococcus aureus was tested according to GB / T 20944. The test results are shown in Table 1 below.

[0062] Table 1 Performance test results

[0063]

[0064] From the above performance test results, it can be seen that the tear strength, radial breaking strength, latitudinal breaking strength, bursting strength, etc. of Examples 1-3 are relatively good. In particular, the comprehensive performance of Example 3 is the most outstanding. Compared with the Examples, the Comparative Examples are significantly worse than the Examples in the corresponding performance tests due to the differences in the composition of each component and the preparation process. The above experimental results further prove the importance of the technical solution defined in the present invention for its technical effect.

[0065] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for preparing a composite geotextile, characterized in that: The composite geotextile includes, from top to bottom, a first protective layer, a reinforcement layer, a fabric base layer, an antibacterial layer, and a second protective layer; the first protective layer, the reinforcement layer, the fabric base layer, the antibacterial layer, and the second protective layer are tightly connected by viscose; The first protective layer and the second protective layer are modified basalt fiber layers; the reinforcement layer is a modified polyacrylonitrile-based carbon fiber layer; the fabric base layer is a polypropylene fiber layer; and the antibacterial layer is a modified polypropylene fiber layer; The preparation method comprises the following steps: S1: preparing a first protective layer and a second protective layer; S2: preparing a reinforcement layer; S3: preparing the antibacterial layer; S4; bonding the second protective layer, the antibacterial layer, the fabric base layer, the reinforcement layer and the first protective layer in sequence from bottom to top by using an adhesive to form a composite geotextile blank; S5: adjusting the tension of the composite geotextile blank obtained in step S4 through a tension frame, and then entering a roll-up machine for edge trimming and roll-up to obtain the composite geotextile; Step S1: The preparation process of the first protective layer is as follows: by weight, 10-20 parts of basalt fiber layer, 3-6 parts of phenolic resin, 2-6 parts of ethylene glycol monobutyl ether, 0.3-0.6 parts of nano silicon dioxide, and 0.5-1 parts of date palm powder are mixed at a temperature of 220-240°C for 3-6 hours to obtain a mixed material; extruded at a temperature of 160-180°C, filtered, spun at a temperature of 240-260°C, and the needle density is controlled to be 70-90 needles / cm 2 , the needling depth is 10-15mm to obtain the first protective layer blank; Step S1: The preparation process of the second protective layer is as follows: by weight, 10-20 parts of basalt fiber layer, 3-6 parts of phenolic resin, 2-6 parts of ethylene glycol monobutyl ether, 0.3-0.6 parts of nano silicon dioxide, and 0.5-1 parts of date palm powder are mixed at a temperature of 220-240°C for 3-6 hours to obtain a mixed material; extruded at a temperature of 160-180°C, filtered, spun at a temperature of 240-260°C, and the needle density is controlled to be 60-70 needles / cm 2 , the needling depth is 12-16 mm to obtain the second protective layer blank; The preparation process of the reinforcement layer in step S2 is as follows: 15-25 parts of polyacrylonitrile-based carbon fiber, 5-10 parts of maleic acid, 2-5 parts of mica powder and 0.3-0.6 parts of lanthanum stearate are mixed at a temperature of 160-180°C for 1-4h; then extruded at a temperature of 140-160°C, filtered and spun at a temperature of 210-230°C, and the needle density is controlled to be 40-50 needles / cm 2 , the needle puncture depth is 8-10mm, and a reinforcement layer is obtained; The preparation process of the antibacterial layer in step S3 is as follows: 20-40 parts of polypropylene fiber, 2-5 parts of dodecyl trimethyl ammonium chloride, 0.5-1.5 parts of nano titanium dioxide and 1-3 parts of chitosan are mixed at a temperature of 150-170°C for 2-3 hours; then extruded at a temperature of 135-145°C, filtered and spun at a temperature of 190-210°C, and the needle density is controlled to be 35-45 needles / cm 2 The needle puncture depth is 7-9mm to obtain an antibacterial layer.

2. The method for preparing a composite geotextile according to claim 1, characterized in that: The thickness ratio of the first protective layer, the reinforcing layer, the fabric base layer, the antibacterial layer and the second protective layer is 1: 0.8-1.0: 0.6-0.9: 1.3-1.8: 0.3-0.6: 1.2-1.

5.

3. The method for preparing a composite geotextile according to claim 2, characterized in that: The specific process of step S4 is: according to the thickness ratio of 1: 0.8-1.0: 0.6-0.9: 1.3-1.8: 0.3-0.6: 1.2-1.5, the first protective layer, the reinforcement layer, the fabric base layer, the antibacterial layer and the second protective layer are connected to each other by adhesive in sequence to form a composite geotextile blank.

4. The method for preparing a composite geotextile according to claim 3, characterized in that: The adhesive is a polyurethane adhesive.

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