High-strength corrosion-resistant flexible geotechnical cloth material and preparation method thereof

Abstract

The invention belongs to the technical field of geotechnical cloth, and particularly relates to a high-strength corrosion-resistant flexible geotechnical cloth material and a preparation method thereof. The geotechnical cloth material is prepared from the following raw materials in parts by mass: 55 to 65 parts of modified polypropylene, 30 to 40 parts of basalt fiber, 2 to 3 parts of color master batch and 3 to 4 parts of anti-ultraviolet master batch. Comprising the following steps: adding basalt fibers into an alkaline solution for alkali etching to obtain pretreated basalt fibers; and mixing the modified polypropylene, the pretreated basalt fiber, the color master batch and the anti-ultraviolet master batch in a high-speed mixer, granulating the mixture by using a twin-screw extruder, and then carrying out melt spinning to obtain the high-strength corrosion-resistant flexible geotechnical cloth material. The geotextile material prepared by the invention has the characteristics of high corrosion resistance, high strength and the like.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of geotextile, and particularly relates to a high-strength corrosion-resistant flexible geotextile material and a preparation method thereof. BACKGROUND

[0002] Geotextile, also known as geotextile, is a water-permeable geosynthetic material formed by needling or weaving synthetic fibers. Geotextile has excellent filtering, isolating and reinforcing protection effects, and has good permeability, high temperature resistance, cold resistance and aging resistance, and has good filtering, isolating, reinforcing and protecting effects. It is a widely used geosynthetic material. Traditional polyester geotextile has low acid and alkali corrosion resistance, and polypropylene staple geotextile has low strength, which cannot meet the application requirements in other fields. Therefore, a high-strength corrosion-resistant flexible geotextile material is needed to prepare a high-strength corrosion-resistant flexible geotextile. SUMMARY

[0003] In view of the above problems, the application provides a high-strength corrosion-resistant flexible geotextile material and a preparation method thereof. The preparation method is simple, and the prepared geotextile material has excellent corrosion resistance and high strength.

[0004] In order to achieve the above purpose, the application provides a high-strength corrosion-resistant flexible geotextile material, which is composed of the following raw materials in parts by mass: 55-65 parts of modified polypropylene, 30-40 parts of basalt fiber, 2-3 parts of color master batch, and 3-4 parts of ultraviolet-resistant master batch.

[0005] The modified polypropylene is prepared by the following steps: maleic anhydride, divinylbenzene, dicumyl peroxide, polypropylene and palm oil are added into a double-screw extruder, and then extruded through a mold under nitrogen protection. The extrudate is placed in a cold water bath at 20-25 DEG C, granulated, and then dried to obtain the modified polypropylene.

[0006] In the above reaction, the above-mentioned dicumyl peroxide is decomposed into primary free radicals benzoyloxy radicals at high temperature in the extruder, which attack the tertiary carbon atoms of the polypropylene main chain to form polypropylene macromolecular radicals by abstracting hydrogen atoms, the double bonds of maleic anhydride combine with the polypropylene macromolecular radicals to form C-C bonds, the acid anhydride groups of maleic anhydride are connected to the polypropylene chain by single bonds to enhance the polarity of the polypropylene, the highly active divinylbenzene is preferentially grafted to the polypropylene macromolecular radicals to form styryl macromolecular radicals, part of which copolymerizes with maleic anhydride, and part of which crosslinks and combines with the polypropylene macromolecular radicals to inhibit the excessive degradation of the polypropylene chain, increase the grafting rate of maleic anhydride, further enhance the polarity of the polypropylene, and improve the compatibility of the polypropylene with palm oil. Under the conditions of high temperature and strong shear in the extruder, the palm oil penetrates into the intermolecular chain gap of the polypropylene, increases the chain spacing, weakens the intermolecular force, inhibits the crystallization growth, reduces the crystallinity of the modified polypropylene, improves the melt flowability, and endows the material with flexibility and impact resistance.

[0007] Further, the modified polypropylene, wherein the amount of maleic anhydride is 0.3-0.5wt%, the amount of divinylbenzene is 0.2-0.6wt%, the amount of dicumyl peroxide is 0.08-0.1wt%, and the amount of palm oil is 3-5wt%, and the rest is polypropylene.

[0008] Further, the parameters of the twin-screw extruder are that the temperature of the first zone of the barrel is 125-135℃, the temperature of the second zone of the barrel is 150-160℃, the temperature of the third zone of the barrel is 160-170℃, and the temperature of the die head is 150-160℃, and the screw rotation speed is 60-70rpm.

[0009] A preparation method of a high-strength corrosion-resistant flexible geotextile material, comprising the following steps: S1, basalt fibers are added to an alkaline solution for alkali etching to obtain pretreated basalt fibers; In the above process, the basalt fibers are added to the alkaline solution to dissolve the surface of the basalt, break the Si-O-Si and Si-O-Al bonds in the amorphous phase, form a concave-convex structure on the surface, increase the specific surface area, and expose the internal active groups Si-OH.

[0010] S2, the modified polypropylene, the pretreated basalt fibers, the color master batch, and the ultraviolet-resistant master batch are mixed in a high-speed mixer, the mixture is granulated by a twin-screw extruder, and then melt spinning is performed to obtain the high-strength corrosion-resistant flexible geotextile material.

[0011] In the above process, the anhydride, free fatty acid carboxyl in the modified polypropylene and Si-OH on the basalt undergoes esterification reaction to form ester bond, forms polypropylene-palmitic acid ester-fiber structure, improves the interfacial shear strength, inhibits the debonding between the fiber and the matrix, the basalt fiber surface presents concave-convex morphology after alkali etching, forms physical entanglement with the palmitic oil molecular chain, produces mechanical interlocking effect, improves the creep resistance of the composite material, the basalt fiber provides high tensile strength and elastic modulus, bears the main load transmission, the palmitic oil in the modified polypropylene introduces flexible chain segments, reduces the brittleness of the matrix, improves the elongation at break, and endows the material with flexibility, and the composite material has high strength and impact resistance; the basalt fiber has natural acid and alkali resistance, inhibits microbial erosion, prevents the degradation of the geotextile in acid and alkali soil, and the unsaturated double bond in the palmitic oil forms a dense oxidation film after oxidation, reduces the water absorption, blocks Cl - , SO4 2- ion permeation, and the two synergistically make the composite material have good corrosion resistance.

[0012] Further, the alkaline solution is 1-2 mol / L sodium hydroxide or 1-2 mol / L potassium hydroxide.

[0013] Further, the alkali etching has a treatment temperature of 60-70℃ and a treatment time of 0.5-1h.

[0014] Further, the high-speed mixing has a rotation speed of 1000-1500rpm and a time of 1-2h.

[0015] Further, the double screw extruder parameters are a barrel zone 1 temperature of 140-170℃, a barrel zone 2 temperature of 170-190℃, a barrel zone 3 temperature of 190-200℃, and a die head temperature of 170-180℃, and a screw rotation speed of 180-200rpm.

[0016] Further, the melt spinning has a spinning temperature of 200-220℃, a winding speed of 140-160m / min, a stretching temperature of 130-140℃, and a setting temperature of 135-145℃.

[0017] In summary, the present application has the following beneficial effects: The geotextile material prepared in the present application improves the compatibility with the palmitic oil by polypropylene grafting maleic anhydride, the palmitic oil penetrates into the intermolecular chain gap of polypropylene under high temperature and strong shear conditions in the extruder, increases the chain spacing, weakens the intermolecular force, inhibits the crystallization growth, reduces the crystallinity of the modified polypropylene, improves the melt flowability, endows the material with flexibility and impact resistance, the basalt fiber has natural acid and alkali resistance, inhibits microbial erosion, prevents the degradation of the geotextile in acid and alkali soil, the unsaturated double bond in the palmitic oil forms a dense oxidation film after oxidation, reduces the water absorption, blocks Cl - , SO42- Plasma infiltration, combined with plasma penetration, gives the composite material excellent corrosion resistance. The geotextile material prepared in this application exhibits high strength and corrosion resistance. Detailed Implementation

[0018] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the embodiments of this application. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] The raw materials used in the specific embodiments of this application are analytical grade. Additionally: palm oil has 3.79% free fatty acids, a peroxide value of 2.8, and an iodine value of 52.5; basalt fiber is short-cut fiber, 6 mm in length and 15 μm in diameter; the masterbatch has a particle size of (2.8-3.3) mm × (3.0-3.4) mm, is black, has a heat resistance of 260℃, and a dispersion grade ≤5; the UV-resistant masterbatch was purchased from Shenzhen Jinzhicheng Plastics Technology Co., Ltd., item number: 51654; the polypropylene has a density of 0.9 g / cm³, a melting temperature of 162℃, a melt flow rate of 11 g / 10 min, and a relative molecular mass of 270,000.

[0020] Example 1 A method for preparing a high-strength, corrosion-resistant, flexible geotextile material includes the following steps: S1. Basalt fiber is added to a 1 mol / L sodium hydroxide solution, with a mass ratio of basalt fiber to 1 mol / L sodium hydroxide solution of 1:3. The treatment temperature is 60℃ and the treatment time is 0.5 h to obtain pretreated basalt fiber. S2. Mix 55 parts modified polypropylene, 30 parts pretreated basalt fiber, 2 parts color masterbatch, and 3 parts UV-resistant masterbatch in a high-speed mixer (1000 rpm, 1 hour). Granulate the mixture using a twin-screw extruder (barrel zone 1 temperature 150℃, barrel zone 2 temperature 170℃, barrel zone 3 temperature 190℃, and die head temperature 170℃, screw speed 180 rpm). Then melt spin (spinning temperature 200℃, winding speed 140 m / min, stretching temperature 130℃, setting temperature 135℃) to obtain a high-strength, corrosion-resistant, flexible geotextile material.

[0021] The modified polypropylene is prepared by the following steps: 0.3wt% maleic anhydride, 0.2wt% divinylbenzene, 0.08wt% dicumyl peroxide, 3wt% palm oil and 96.42wt% polypropylene are added into a twin-screw extruder (barrel zone 1 temperature 125℃, barrel zone 2 150℃, barrel zone 3 temperature 160℃ and die head temperature 150℃, screw rotation speed 60rpm), then extruded through a die, the whole process is protected by nitrogen, the extrudate is placed in a cold water bath at 25℃, granulated, and then dried at 80℃ for 1h to obtain the modified polypropylene.

[0022] Example 2 A method for preparing a high-strength corrosion-resistant flexible geotextile material, comprising the following steps: S1, basalt fibers are added to a 1.5mol / L sodium hydroxide solution, the mass ratio of basalt fibers to 1.5mol / L sodium hydroxide solution is 1:3, the treatment temperature is 60℃, and the treatment time is 0.5h to obtain pretreated basalt fibers; S2, 60 parts of modified polypropylene, 35 parts of pretreated basalt fibers, 2 parts of color masterbatch, and 3 parts of ultraviolet-resistant masterbatch are mixed in a high-speed mixer (rotation speed 1000rpm, time 1h), the mixture is granulated by a twin-screw extruder (barrel zone 1 temperature 160℃, barrel zone 2 180℃, barrel zone 3 temperature 195℃ and die head temperature 175℃, screw rotation speed 190rpm), and then melt spinning (spinning temperature 210℃, winding speed 150m / min, stretching temperature 135℃, setting temperature 140℃) to obtain a high-strength corrosion-resistant flexible geotextile material.

[0023] The modified polypropylene is prepared by the following steps: 0.4wt% maleic anhydride, 0.4wt% divinylbenzene, 0.09wt% dicumyl peroxide, 4wt% palm oil and 95.11wt% polypropylene are added into a twin-screw extruder (barrel zone 1 temperature 130℃, barrel zone 2 155℃, barrel zone 3 temperature 165℃ and die head temperature 155℃, screw rotation speed 65rpm), then extruded through a die, the whole process is protected by nitrogen, the extrudate is placed in a cold water bath at 25℃, granulated, and then dried at 80℃ for 1h to obtain the modified polypropylene.

[0024] Example 3 A method for preparing a high-strength corrosion-resistant flexible geotextile material, comprising the following steps: S1, basalt fibers are added to a 2mol / L sodium hydroxide solution, the mass ratio of basalt fibers to 2mol / L sodium hydroxide solution is 1:3, the treatment temperature is 60℃, and the treatment time is 0.5h to obtain pretreated basalt fibers; S2, 65 parts of modified polypropylene, 40 parts of pretreated basalt fiber, 3 parts of color masterbatch, 4 parts of ultraviolet resistant masterbatch were mixed in a high-speed mixer (rotation speed was 1000 rpm, time was 1 h), the mixture was granulated by a twin-screw extruder (barrel zone 1 temperature was 170℃, barrel zone 2 temperature was 190℃, barrel zone 3 temperature was 200℃, and die head temperature was 180℃, screw rotation speed was 200 rpm), and then melt spinning (spinning temperature was 220℃, winding speed was 160 m / min, stretching temperature was 140℃, setting temperature was 145℃) was performed, to obtain a high-strength corrosion-resistant flexible geotextile material.

[0025] The modified polypropylene was prepared by the following steps: 0.5wt% maleic anhydride, 2.6wt% divinylbenzene, 0.1wt% dicumyl peroxide, 5wt% palm oil and 93.8wt% polypropylene were added to a twin-screw extruder (barrel zone 1 temperature was 135℃, barrel zone 2 temperature was 160℃, barrel zone 3 temperature was 170℃, and die head temperature was 160℃, screw rotation speed was 70 rpm), and then extruded through a die, with nitrogen protection throughout the process, the extrudate was placed in a cold water bath at 25℃, granulated, and then dried at 80℃ for 1h, to obtain the modified polypropylene.

[0026] Comparative Example 1 The difference between this comparative example and Example 3 is that the concentration of the sodium hydroxide solution used is 5 mol / L.

[0027] Comparative Example 2 The difference between this comparative example and Example 3 is that the amount of divinylbenzene used is 0.7wt%.

[0028] Comparative Example 3 The difference between this comparative example and Example 3 is that glass fiber is used instead of basalt fiber.

[0029] Comparative Example 4 The difference between this comparative example and Example 3 is that the amount of palm oil used is 6wt%.

[0030] Performance test Functional tests were performed on the high-strength corrosion-resistant flexible geotextile materials prepared in Examples 1-3 and Comparative Examples 1-4.

[0031] Tensile strength test: a YT010-1000 type electronic geotextile comprehensive strength machine was used to test the tensile properties according to GB / T 15788-2005 “Geotextiles and Related Products Wide Strip Tensile Test”; Breaking strength test: a YT010-1000 type electronic geotextile comprehensive strength machine was used to test the tearing strength according to GB / T 13763-2010 “Determination of Geosynthetic Tearing Strength by Trapezoidal Method”; Tear strength test: The YT010-1000 type electronic geotextile comprehensive strength machine was used to test the tensile strength according to GB / T 14800-2010 "Geosynthetic materials-static puncture test (CBR method)"; Corrosion resistance test: The high-strength corrosion-resistant flexible geotextile materials prepared in Examples 1-3 and Comparative Examples 1-4 were measured for tensile strength retention rate after being soaked in an acidic environment (pH = 2) for 720 h. The test results are shown in Table 1: Table 1

[0032] As can be seen from Table 1, the high-strength corrosion-resistant flexible geotextile material prepared in the examples of the present application has high tensile strength, high puncture strength, high tear strength and high corrosion resistance, especially the effect of Example 2 is the best; the concentration of sodium hydroxide solution used in Comparative Example 1 and Example 3 is 5 mol / L, and the test results show that the tensile strength, puncture strength, tear strength and corrosion resistance are relatively low. Due to the increase of the concentration of sodium hydroxide solution, the alkali etching is excessive, which leads to the decrease of the mechanical properties of basalt fibers, resulting in the decrease of the performance of the prepared geotextile material; the amount of divinylbenzene used in Comparative Example 2 is 0.7 wt%, and the test results show that the tensile strength, puncture strength, tear strength and corrosion resistance are not as good as Example 3. High reactivity divinylbenzene is used as a crosslinking agent between polypropylene chains and maleic anhydride to improve the grafting rate of maleic anhydride. The increase of the amount of divinylbenzene leads to the dominance of divinylbenzene branching, which reduces the grafting rate of maleic anhydride, resulting in the decrease of the compatibility of polypropylene and palm oil, leading to the decrease of the performance of the prepared geotextile material; the test results of Comparative Example 3 and Example 3 show that the tensile strength, puncture strength, tear strength and corrosion resistance are relatively low. Glass fiber is not as good as basalt fiber in mechanical properties, and its corrosion resistance is not as good as basalt fiber. The interfacial bonding force between glass fiber and modified polypropylene is not as good as basalt fiber, which indicates that glass fiber cannot replace basalt fiber, and Comparative Example 3 is not as good as Example 3; the amount of palm oil used in Comparative Example 4 is increased compared with Example 3, and the test results show that the tensile strength, puncture strength, tear strength and corrosion resistance are not as good as Example 3. The increase of the amount of palm oil leads to the phase separation of palm oil and polypropylene, which cannot be uniformly distributed in polypropylene, resulting in the decrease of the performance of the prepared geotextile material.

[0033] In summary, the high-strength corrosion-resistant flexible geotextile material prepared in the examples of the present application has excellent mechanical properties and corrosion resistance, especially the performance of Example 2 is the best, and Example 2 is the best embodiment.

[0034] The above merely provides description and illustration of the present application, and those skilled in the art can make various modifications or supplementations to the specific embodiments described or adopt similar technical means to substitute, as long as they do not deviate from the concept of the present application or exceed the scope of the present application defined by the claims.

Claims

1. A high-strength, corrosion-resistant, flexible geotextile material, characterized in that, The geotextile material is composed of the following mass parts of raw materials: 55-65 parts of modified polypropylene, 30-40 parts of basalt fiber, 2-3 parts of color master batch, 3-4 parts of ultraviolet resistant master batch; The modified polypropylene is prepared by the following steps: maleic anhydride, divinylbenzene, dicumyl peroxide, polypropylene and palm oil are added into a twin-screw extruder, and then extruded through a die under nitrogen protection, the extrudate is placed in a cold water bath at 20-25℃, granulated, and then dried to obtain the modified polypropylene.

2. The high strength, corrosion resistant, flexible geotextile material of claim 1, wherein, The modified polypropylene, wherein the amount of maleic anhydride is 0.3-0.5wt%, the amount of divinylbenzene is 0.2-0.6wt%, the amount of dicumyl peroxide is 0.08-0.1wt%, and the amount of palm oil is 3-5wt%, and the rest is polypropylene.

3. The high strength, corrosion resistant, flexible geotextile material of claim 1, wherein, The parameters of the twin-screw extruder are: barrel zone 1 temperature 125-135℃, barrel zone 2 temperature 150-160℃, barrel zone 3 temperature 160-170℃, and die head temperature 150-160℃, screw rotation speed 60-70rpm.

4. A method of producing a high-strength corrosion-resistant flexible geotextile material as claimed in any one of claims 1 to 3, characterized in that, Comprising the following steps: S1, basalt fibers are added into an alkaline solution for alkali etching to obtain pretreated basalt fibers; S2, the modified polypropylene, the pretreated basalt fibers, the color master batch, and the ultraviolet resistant master batch are mixed in a high-speed mixer, the mixture is granulated by a twin-screw extruder, and then melt spinning is performed to obtain a high-strength corrosion-resistant flexible geotextile material.

5. The method for preparing a high-strength, corrosion-resistant, flexible geotextile material according to claim 4, characterized in that, The alkaline solution is 1-2mol / L sodium hydroxide or 1-2mol / L potassium hydroxide.

6. The method for preparing a high-strength, corrosion-resistant, flexible geotextile material according to claim 4, characterized in that, The alkali etching is performed at a temperature of 60-70℃ for 0.5-1h.

7. The method for preparing a high-strength, corrosion-resistant, flexible geotextile material according to claim 4, characterized in that, The high-speed mixing is performed at a rotation speed of 1000-1500rpm for 1-2h.

8. The method for preparing a high-strength, corrosion-resistant, flexible geotextile material according to claim 4, characterized in that, The parameters of the twin-screw extruder are: barrel zone 1 temperature 140-170℃, barrel zone 2 temperature 170-190℃, barrel zone 3 temperature 190-200℃, and die head temperature 170-180℃, screw rotation speed 180-200rpm.

9. The method for preparing a high-strength, corrosion-resistant, flexible geotextile material according to claim 4, characterized in that, The melt spinning is performed at a spinning temperature of 200-220℃, a winding speed of 140-160m / min, a stretching temperature of 130-140℃, and a setting temperature of 135-145℃.

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