Hot-melt geotextile and preparation method thereof

Abstract

The invention discloses a hot-melt geotextile and a preparation method thereof, and belongs to the technical field of geosynthetic materials. The hot-melt geotextile comprises the following components in parts by weight: 10-20 parts of polyester, 10-20 parts of polypropylene, 4-8 parts of 4080 low-melting-point fibers, 1-3 parts of a compatilizer, 3-5 parts of a modifier and 0.1-0.3 part of an antioxidant, and through reasonable component design and introduction of the modifier, the comprehensive performance of the hot-melt geotextile is remarkably improved; the composite material has excellent technical effects in the aspects of mechanical property, antibacterial property, flame retardant property and the like, and can be applied to complex working conditions and environments; the preparation process disclosed by the invention is simple and feasible, is suitable for industrial production, and has a wide application prospect and a remarkable economic value.

Description

Technical Field

[0001] The invention relates to the technical field of geosynthetics, and in particular to a hot-melt geotextile and a preparation method thereof. Background Art

[0002] Geotextile is an engineering material widely used in civil engineering, environmental protection, water conservancy engineering and other fields. It is mainly used for foundation reinforcement, isolation, filtration, drainage, protection and other functions. With the rapid development of infrastructure construction, the demand for geotextiles continues to increase, and its performance requirements are also increasing. Traditional geotextiles are mainly divided into two categories: woven geotextiles and non-woven geotextiles, which are prepared by textile and non-woven processes respectively. However, traditional geotextiles have some limitations in practical applications, especially in terms of durability, strength and construction convenience, and it is difficult to meet the needs of complex engineering environments.

[0003] In recent years, hot-melt geotextile has gradually attracted attention as a new type of geotechnical material. Hot-melt geotextile uses a hot-melt process to melt and bond fiber materials to form a stable structure, which has excellent mechanical properties, durability and environmental adaptability.

[0004] Chinese patent document CN119177522A discloses a kind of durable antibacterial polypropylene filament nonwoven geotextile and its preparation method, by using organosilicon quaternary ammonium salt containing double bonds as antibacterial agent, melt blending with polypropylene masterbatch at a certain temperature, and adding an appropriate amount of initiator, promoting graft copolymerization reaction, making antibacterial agent and polypropylene form covalent bonds, ensuring that antibacterial components are evenly distributed and not lost. The geotextile prepared by acupuncture process has strong antibacterial properties and persistence, effectively inhibits microbial growth, prolongs service life, and enhances functional stability under various environmental conditions. The geotextile of this invention meets the market demand of environmental protection and sustainable development, is suitable for projects that need to be exposed to high humidity and complex microbial environments for a long time, and provides reliable guarantee for more extensive engineering applications. However, this method only focuses on improving the antibacterial properties of geotextiles, and its flame retardancy and mechanical properties need to be further improved. Summary of the invention

[0005] The main purpose of the present invention is to provide a hot-melt geotextile and a preparation method thereof. The hot-melt geotextile prepared by the present invention is immersed in 50°C water for 1 month and then heated to 95μW / cm 2 After being irradiated with ultraviolet light for one month, it still has good mechanical and antibacterial properties and can be used in complex working environments.

[0006] To achieve the above purpose, the present invention provides a hot-melt geotextile, comprising the following components in parts by weight: 10-20 parts of polyester, 10-20 parts of polypropylene, 4-8 parts of 4080 low-melting point fiber, 1-3 parts of compatibilizer, 3-5 parts of modifier, and 0.1-0.3 parts of antioxidant.

[0007] Preferably, the polyester is polybutylene terephthalate and / or polyethylene terephthalate.

[0008] Preferably, the polypropylene is copolymer polypropylene or homopolypropylene.

[0009] Preferably, the compatibilizer is at least one of PE-g-MAH, PP-g-MA, EVA-g-MAH, POE-g-MAH, and EPDM-g-MA.

[0010] Preferably, the preparation method of the modifier is as follows:

[0011] (1) immersing nano-titanium dioxide in a dilute acid aqueous solution, heating and stirring, cooling, standing, filtering, collecting solids, washing, drying, grinding and sieving to obtain pretreated nano-titanium dioxide;

[0012] (2) adding the pretreated nano-titanium dioxide to an ethanol aqueous solution, adding 3-[3-carboxyallylamide]propyltriethoxysilane, heating to react, filtering, collecting solids, washing and drying the solids, adding the solids to anhydrous ethanol, adding linalool and benzoyl peroxide, heating to react, filtering, collecting the solids, washing and drying to obtain modified nano-titanium dioxide;

[0013] (3) adding modified nano titanium dioxide into water, adding guanidine sulfamate and 1-ethyl-(3-dimethylaminopropyl)carbodiimide, dispersing by ultrasonication, heating for reaction, filtering, collecting solids, washing and drying to obtain a modifier.

[0014] Preferably, in step (1), the mass ratio of nano-titanium dioxide to dilute acid aqueous solution is 1:5-10; the concentration of the dilute acid aqueous solution is 10-20wt%; and the heating temperature is 40-60°C.

[0015] Preferably, in the step (2), the mass ratio of pretreated nano-titanium dioxide, 3-[3-carboxyallylamide]propyltriethoxysilane, and linalool is 20-30:3-4:4-6.

[0016] Preferably, in step (3), the mass ratio of modified nano-titanium dioxide, aminosulfonate guanidine and 1-ethyl-(3-dimethylaminopropyl)carbodiimide is 15-20:12-15:5-8.

[0017] The present invention can improve the antibacterial, flame retardant and mechanical properties of the hot-melt geotextile by adding a modifier into the hot-melt geotextile, so that the hot-melt geotextile can be used in a humid, fire-resistant or working environment with high mechanical strength requirements.

[0018] Preferably, the antioxidant is at least one of pentaerythritol [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, tris(2,4-di-tert-butylphenyl) phosphite, distearyl thiodipropionate, butylated hydroxyanisole and butylated hydroxytoluene.

[0019] The present invention also discloses a method for preparing the hot-melt geotextile, comprising the following steps:

[0020] The polyester, polypropylene, 4080 low melting point fiber, compatibilizer, modifier and antioxidant are mixed and melted to obtain a melt, and the melt is successively subjected to spinning, traction, web laying, needle punching and hot rolling to obtain the hot-melt geotextile.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1) The present invention proposes a hot-melt geotextile and a preparation method thereof. Through reasonable component design and the introduction of a modifier, the comprehensive performance of the hot-melt geotextile is significantly improved. The hot-melt geotextile is immersed in 50°C water for 1 month and the strength is 95μW / cm 2 After being irradiated with ultraviolet light for one month, the product still has good mechanical and antibacterial properties and can be used in complex working environments. The preparation process of the invention is simple and easy to implement, suitable for industrial production, and has broad application prospects and significant economic value.

[0023] 2) The present invention can significantly improve the antibacterial, flame retardant and mechanical properties of the geotextile by adding a modifier to the hot-melt geotextile. The preparation of the modifier is to first treat the nano-titanium dioxide with acid, which is beneficial to activate the surface functional groups of the nano-titanium dioxide and improve the surface activity of the nano-titanium dioxide. The surface of the nano-titanium dioxide is treated with 3-[3-carboxyallylamide]propyltriethoxysilane to introduce carbon-carbon double bonds and carboxyl groups on the surface of the nano-titanium dioxide. Then, the antibacterial agent linalool is added to react with the nano-titanium dioxide to obtain modified nano-titanium dioxide. On the one hand, the compatibility and antibacterial properties of the nano-titanium dioxide and the polymer matrix can be improved. The fatty acid chain of linalool is beneficial to the nano-titanium dioxide. The polymer matrix is ​​interwoven and entangled to improve the toughness and strength of the hot-melt geotextile, so that the hot-melt geotextile has higher tensile and tear resistance under complex working conditions. On the other hand, it is beneficial to the subsequent reaction. Finally, the carboxyl group in the modified nano-titanium dioxide reacts with aminosulfonate guanidine to obtain the modifier. The introduction of aminosulfonate guanidine is beneficial to further improve the antibacterial and flame retardancy of the hot-melt geotextile. It can synergize with nano-titanium dioxide and linalool to enable the hot-melt geotextile to maintain the antibacterial effect for a long time in a complex environment, and is suitable for humid and severely polluted environments. It can also synergize with nano-titanium dioxide to improve the flame retardant properties of the hot-melt geotextile, so that the hot-melt geotextile can be used in more complex working conditions. DETAILED DESCRIPTION

[0024] To avoid redundancy, the items used in the following examples are all commercially available products unless otherwise specified, and the methods used are all conventional methods unless otherwise specified.

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

[0026] Polyester is polybutylene terephthalate, LANXESS, Germany, model B3215, purchased from Jiangsu Weirun High Plastic Chemical Co., Ltd.

[0027] Polypropylene, homopolymer polypropylene, brand PPH-M12, melt flow rate of 12g / 10min, purchased from Shenzhen Zhengrui Plastic Chemical Co., Ltd.

[0028] Nano-titanium dioxide, rutile type, 325 mesh, was purchased from Hebei Houkang Mineral Products Co., Ltd.

[0029] 4080 low melting point fiber, 51 mm in length, was purchased from Shanghai Fuding New Material Technology Co., Ltd.

[0030] Example 1

[0031] A method for preparing a hot-melt geotextile comprises the following steps:

[0032] 150g of polybutylene terephthalate, 150g of polypropylene, 65g of 4080 low-melting point fiber, 25g of PE-g-MAH, 42g of a modifier, and 2g of butylated hydroxyanisole are mixed and melted to obtain a melt, and the melt is sequentially spun, drawn, laid, needled, and hot-rolled to obtain the hot-melt geotextile.

[0033] The preparation method of the modifier is as follows:

[0034] (1) 60 g of nano-titanium dioxide was immersed in 500 mL of 15 wt% dilute sulfuric acid aqueous solution, heated and stirred at 50° C. for 2 h, cooled, allowed to stand, filtered, and the solid was collected, washed, dried, and ground through an 80-mesh sieve to obtain pretreated nano-titanium dioxide;

[0035] (2) adding 50 g of pretreated nano-titanium dioxide to 300 mL of 50 wt% ethanol aqueous solution, adding 7 g of 3-[3-carboxyallylamide]propyltriethoxysilane, heating at 50° C. for reaction for 3 h, filtering and collecting solids, washing and drying the solids, adding them to 300 mL of anhydrous ethanol, adding 10.2 g of linalool and 1.5 g of benzoyl peroxide, heating at 60° C. for reaction for 6 h, filtering, collecting the solids, washing and drying them to obtain modified nano-titanium dioxide;

[0036] (3) 36 g of modified nano titanium dioxide was added to 200 mL of water, and 26.5 g of guanidine sulfamate and 12.6 g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide were added for ultrasonic dispersion, and then heated at 50° C. for reaction for 2 h. The solid was collected by filtration, washed and dried to obtain a modifier.

[0037] Example 2

[0038] A method for preparing a hot-melt geotextile comprises the following steps:

[0039] 100g of polybutylene terephthalate, 100g of polypropylene, 40g of 4080 low-melting point fiber, 10g of PP-g-MA, 30g of a modifier, and 1g of pentaerythritol [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] are mixed and melted to obtain a melt, and the melt is sequentially spun, drawn, laid, needled, and hot-rolled to obtain the hot-melt geotextile.

[0040] The preparation method of the modifier is as follows:

[0041] (1) 60 g of nano-titanium dioxide was immersed in 500 mL of 15 wt% dilute sulfuric acid aqueous solution, heated and stirred at 50° C. for 2 h, cooled, allowed to stand, filtered, and the solid was collected, washed, dried, and ground through an 80-mesh sieve to obtain pretreated nano-titanium dioxide;

[0042] (2) adding 40 g of pretreated nano-titanium dioxide to 300 mL of 50 wt% ethanol aqueous solution, adding 6 g of 3-[3-carboxyallylamide]propyltriethoxysilane, heating at 50° C. for reaction for 3 h, filtering and collecting solids, washing and drying the solids, adding them to 300 mL of anhydrous ethanol, adding 8.2 g of linalool and 1 g of benzoyl peroxide, heating at 60° C. for reaction for 6 h, filtering, collecting the solids, washing and drying them to obtain modified nano-titanium dioxide;

[0043] (3) 30 g of modified nano titanium dioxide was added to 200 mL of water, and 24 g of guanidine sulfamate and 10.2 g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide were added for ultrasonic dispersion, and then heated at 50° C. for reaction for 2 h. The solid was collected by filtration, washed and dried to obtain a modifier.

[0044] Example 3

[0045] A method for preparing a hot-melt geotextile comprises the following steps:

[0046] 200g of polybutylene terephthalate, 200g of polypropylene, 80g of 4080 low-melting point fiber, 30g of PE-g-MAH, 50g of a modifier, and 3g of distearyl thiodipropionate are mixed and melted to obtain a melt, and the melt is sequentially spun, drawn, laid, needled, and hot-rolled to obtain the hot-melt geotextile.

[0047] The preparation method of the modifier is as follows:

[0048] (1) 60 g of nano-titanium dioxide was immersed in 500 mL of 15 wt% dilute sulfuric acid aqueous solution, heated and stirred at 50° C. for 2 h, cooled, allowed to stand, filtered, and the solid was collected, washed, dried, and ground through an 80-mesh sieve to obtain pretreated nano-titanium dioxide;

[0049] (2) adding 45 g of pretreated nano-titanium dioxide to 300 mL of 50 wt% ethanol aqueous solution, adding 6 g of 3-[3-carboxyallylamide]propyltriethoxysilane, heating at 50° C. for reaction for 3 h, filtering and collecting solids, washing and drying the solids, adding them to 300 mL of anhydrous ethanol, adding 9 g of linalool and 1 g of benzoyl peroxide, heating at 60° C. for reaction for 6 h, filtering, collecting the solids, washing and drying them to obtain modified nano-titanium dioxide;

[0050] (3) 40 g of modified nano titanium dioxide was added to 200 mL of water, and 30 g of guanidine sulfamate and 15.9 g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide were added for ultrasonic dispersion, and then heated at 50° C. for reaction for 2 h. The solid was collected by filtration, washed and dried to obtain a modifier.

[0051] Comparative Example 1

[0052] A method for preparing a hot-melt geotextile is similar to that of Example 1, except that guanidine sulfamate is not added to the modifier, and specifically comprises the following steps:

[0053] 150g of polybutylene terephthalate, 150g of polypropylene, 65g of 4080 low-melting point fiber, 25g of PE-g-MAH, 42g of a modifier, and 2g of butylated hydroxyanisole are mixed and melted to obtain a melt, and the melt is sequentially spun, drawn, laid, needled, and hot-rolled to obtain the hot-melt geotextile.

[0054] The preparation method of the modifier is as follows:

[0055] (1) 60 g of nano-titanium dioxide was immersed in 500 mL of 15 wt% dilute sulfuric acid aqueous solution, heated and stirred at 50° C. for 2 h, cooled, allowed to stand, filtered, and the solid was collected, washed, dried, and ground through an 80-mesh sieve to obtain pretreated nano-titanium dioxide;

[0056] (2) Add 50 g of pretreated nano-titanium dioxide to 300 mL of 50 wt% ethanol aqueous solution, add 7 g of 3-[3-carboxyallylamide]propyltriethoxysilane, heat at 50 ° C for 3 h, filter and collect the solid, wash and dry the solid, add it to 300 mL of anhydrous ethanol, add 10 g of linalool and 1.5 g of benzoyl peroxide, heat at 60 ° C for 6 h, filter, collect the solid, wash and dry to obtain modified nano-titanium dioxide, which is the modifier.

[0057] Comparative Example 2

[0058] A method for preparing a hot-melt geotextile is similar to that of Example 1, except that the modifier is a mixture of nano-titanium dioxide and linalool in a mass ratio of 5:1, and comprises the following steps:

[0059] 150g of polybutylene terephthalate, 150g of polypropylene, 65g of 4080 low-melting point fiber, 25g of PE-g-MAH, 42g of a modifier (a mixture of nano-titanium dioxide and linalool in a mass ratio of 5:1), and 2g of butylated hydroxyanisole are mixed and melted to obtain a melt, and the melt is sequentially spun, drawn, laid, needled, and hot-rolled to obtain the hot-melt geotextile.

[0060] Comparative Example 3

[0061] A method for preparing a hot-melt geotextile is similar to that of Example 1, except that the modifier is nano-titanium dioxide, and comprises the following steps:

[0062] 150g of polybutylene terephthalate, 150g of polypropylene, 65g of 4080 low-melting point fiber, 25g of PE-g-MAH, 42g of nano titanium dioxide, and 2g of butylated hydroxyanisole are mixed and melted to obtain a melt, and the melt is successively spun, drawn, laid, needled, and hot-rolled to obtain the hot-melt geotextile.

[0063] Performance Testing

[0064] The hot-melt geotextiles prepared in Examples 1-3 and Comparative Examples 1-3 were tested for antibacterial, mechanical and flame retardant properties, and then immersed in 50°C water and heated with a strength of 95 μW / cm 2 After irradiation with ultraviolet light for one month, the antibacterial and mechanical properties were tested:

[0065] Tear resistance test of hot-melt geotextile: The test method refers to GB / T3917.2-2009 "Tear properties of textile fabrics Part 2: Determination of tear strength of trouser-shaped specimens (single seam)", and the tear resistance of the hot-melt geotextiles prepared by Examples 1-3 and Comparative Examples 1-3 of the present invention is tested. The test results are shown in Table 1:

[0066] Table 1 Test results of tear resistance of hot melt geotextile

[0067]

[0068] Antibacterial performance: Tested with reference to GB / T20944.1-2007 "Evaluation of antibacterial properties of textiles Part 1: Agar plate diffusion method", the test strain is Staphylococcus aureus (ATCC6538); take a 25mm diameter hot melt geotextile sample, incubate it in an environment with a temperature of 37°C and a relative humidity of 85% for 24 hours, and determine the width of the inhibition zone; the test results are shown in Table 2:

[0069] Table 2 Antibacterial performance test results

[0070]

[0071] Limiting oxygen index test: According to the textile combustion performance test GB / 5454-1997 "Textile Combustion Performance Oxygen Index Method", the test is carried out on an oxygen index tester, and the sample size is 80mm×300mm; the larger the LOI value, the better the flame retardant performance. The test results are shown in Table 3:

[0072] Table 3 Flame retardant performance test results

[0073] Limiting oxygen index LOI (%) Example 1 36.5 Example 2 35.8 Example 3 37.6 Comparative Example 1 28.5 Comparative Example 2 24.8 Comparative Example 3 24.7

[0074] It can be seen from the experimental results in Table 1, Table 2 and Table 3 that the hot-melt geotextile prepared by the present invention has good mechanical, antibacterial and flame retardant properties. 2 After being irradiated with ultraviolet light for one month, it still has good mechanical and antibacterial properties.

[0075] The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. For those skilled in the art, the present invention may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the patent protection scope of the present invention.

Claims

1. A hot-melt geotextile, characterized in that: The invention comprises the following components in parts by weight: 10-20 parts of polyester, 10-20 parts of polypropylene, 4-8 parts of 4080 low melting point fiber, 1-3 parts of compatibilizer, 3-5 parts of modifier and 0.1-0.3 parts of antioxidant.

2. The hot-melt geotextile according to claim 1, characterized in that: The polyester is polybutylene terephthalate and / or polyethylene terephthalate.

3. The hot-melt geotextile according to claim 1, characterized in that: The polypropylene is copolymer polypropylene or homopolypropylene.

4. The hot-melt geotextile according to claim 1, characterized in that: The preparation method of the modifier is as follows: (1) immersing nano-titanium dioxide in a dilute acid aqueous solution, heating and stirring, cooling, standing, filtering, collecting solids, washing, drying, grinding and sieving to obtain pretreated nano-titanium dioxide; (2) adding the pretreated nano-titanium dioxide to an ethanol aqueous solution, adding 3-[3-carboxyallylamide]propyltriethoxysilane, heating to react, filtering, collecting solids, washing and drying the solids, adding the solids to anhydrous ethanol, adding linalool and benzoyl peroxide, heating to react, filtering, collecting the solids, washing and drying to obtain modified nano-titanium dioxide; (3) adding the modified nano titanium dioxide into anhydrous ethanol, adding guanidine sulfamate and 1-ethyl-(3-dimethylaminopropyl)carbodiimide, dispersing by ultrasonication, heating for reaction, filtering, collecting the solid, washing and drying to obtain the modifier.

5. The hot-melt geotextile according to claim 4, characterized in that: In the step (1), the mass ratio of nano-titanium dioxide to dilute acid aqueous solution is 1:5-10.

6. The hot-melt geotextile according to claim 4, characterized in that: The concentration of the dilute acid aqueous solution in step (1) is 10-20wt%; the heating temperature is 40-60°C.

7. The hot-melt geotextile according to claim 4, characterized in that: In the step (2), the mass ratio of pretreated nano-titanium dioxide, 3-[3-carboxyallylamide]propyltriethoxysilane and linalool is 20-30:3-4:4-6.

8. The hot-melt geotextile according to claim 4, characterized in that: In the step (3), the mass ratio of modified nano titanium dioxide, aminosulfonate guanidine and 1-ethyl-(3-dimethylaminopropyl)carbodiimide is 15-20:12-15:5-8.

9. The hot-melt geotextile according to claim 1, characterized in that: The antioxidant is at least one of pentaerythritol [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, tris(2,4-di-tert-butylphenyl) phosphite, distearyl thiodipropionate, butylated hydroxyanisole and butylated hydroxytoluene.

10. A method for preparing the hot-melt geotextile according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: mixing and melting polyester, polypropylene, 4080 low melting point fiber, a compatibilizer, a modifier and an antioxidant to obtain a melt, and the melt is sequentially subjected to spinning, traction, web laying, needle punching and hot rolling to obtain the hot-melt geotextile.

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