A hot-melt geotextile and its preparation method

Abstract

This invention discloses a hot-melt geotextile and its preparation method, belonging to the field of geosynthetic materials technology. The hot-melt geotextile comprises the following components by weight: 10-20 parts polyester, 10-20 parts polypropylene, 4-8 parts 4080 low-melting-point fiber, 1-3 parts compatibilizer, 3-5 parts modifier, and 0.1-0.3 parts antioxidant. Through reasonable component design and the introduction of modifiers, the comprehensive performance of the hot-melt geotextile is significantly improved, exhibiting excellent technical effects in mechanical properties, antibacterial properties, and flame retardant properties, making it suitable for application in complex working environments. The preparation process of this invention is simple and easy to implement, suitable for industrial production, and has broad application prospects and significant economic value.

Description

Technical Field

[0001] This invention relates to the field of geosynthetic materials technology, specifically to a hot-melt geotextile and its preparation method. Background Technology

[0002] Geotextiles are engineering materials widely used in civil engineering, environmental protection, and water conservancy projects, primarily for functions such as foundation reinforcement, isolation, filtration, drainage, and protection. With the rapid development of infrastructure construction, the demand for geotextiles is constantly increasing, and their performance requirements are also rising. Traditional geotextiles are mainly divided into two categories: woven geotextiles and nonwoven geotextiles, prepared through textile and nonwoven processes, respectively. However, traditional geotextiles have some limitations in practical applications, especially in terms of durability, strength, and ease of construction, making it difficult to meet the needs of complex engineering environments.

[0003] In recent years, hot-melt geotextiles have gradually attracted attention as a new type of geotextile material. Hot-melt geotextiles form a stable structure by melting and bonding fiber materials through a hot-melt process, and have excellent mechanical properties, durability, and environmental adaptability.

[0004] Chinese patent document CN119177522A discloses a durable antibacterial polypropylene filament nonwoven geotextile and its preparation method. The method involves using an organosilicon quaternary ammonium salt containing double bonds as an antibacterial agent, melt-blending it with polypropylene masterbatch at a certain temperature, and adding an appropriate amount of initiator to promote graft copolymerization, allowing the antibacterial agent to form covalent bonds with the polypropylene, ensuring uniform distribution of the antibacterial components and preventing loss. The geotextile prepared through a needle-punching process exhibits strong antibacterial properties and durability, effectively inhibiting microbial growth, extending service life, and enhancing functional stability under various environmental conditions. This invention's geotextile meets the market demands for environmental protection and sustainable development, and is suitable for engineering projects requiring prolonged exposure to high humidity and complex microbial environments, providing reliable protection for broader engineering applications. However, this method only focuses on improving the antibacterial properties of the geotextile; its flame retardancy and mechanical properties still need further improvement. Summary of the Invention

[0005] The main objective of this invention is to provide a hot-melt geotextile and its preparation method. The hot-melt geotextile prepared by this invention is soaked in water at 50°C for one month and then tested with a strength of 95 μW / cm. 2 Even after being exposed to ultraviolet light for one month, it still retains good mechanical and antibacterial properties and can be applied in complex working environments.

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

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

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

[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 modifier is prepared by the following method:

[0011] (1) The nano-titanium dioxide was immersed in a dilute acid aqueous solution, heated and stirred, cooled, allowed to stand, filtered, the solid was collected, washed, dried, ground and sieved to obtain pretreated nano-titanium dioxide.

[0012] (2) Add the pretreated nano-titanium dioxide to an aqueous ethanol solution, add 3-[3-carboxyallylamido]propyltriethoxysilane, heat to react, filter, collect the solid, wash and dry the solid, add it to anhydrous ethanol, add linalool and benzoyl peroxide, heat to react, filter, collect the solid, wash and dry to obtain modified nano-titanium dioxide.

[0013] (3) Add the modified nano-titanium dioxide to water, add guanidine aminosulfonate and 1-ethyl-(3-dimethylaminopropyl)carbodiimide, disperse by ultrasonication, heat to react, filter, collect the solid, wash and dry to obtain the 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℃.

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

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

[0017] This invention improves the antibacterial, flame-retardant and mechanical properties of hot-melt geotextile by adding a modifier, enabling the hot-melt geotextile to be used in humid, fire-resistant or high-strength working environments.

[0018] Preferably, the antioxidant is at least one selected from pentaerythritol ester [β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], tris(2,4-di-tert-butylphenyl)phosphite, dioctadecyl 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] Polyester, polypropylene, 4080 low-melting-point fiber, compatibilizer, modifier, and antioxidant are mixed and melted to obtain a melt. The melt is then sequentially processed through spinning, traction, web laying, needle punching, and hot rolling to obtain the hot-melt geotextile.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1) This invention proposes a hot-melt geotextile and its preparation method. Through reasonable component design and the introduction of modifiers, the comprehensive performance of the hot-melt geotextile is significantly improved, allowing it to withstand immersion in water at 50°C for one month and achieve a strength of 95 μW / cm. 2 Even after one month of irradiation with ultraviolet light, it still exhibits good mechanical and antibacterial properties, making it suitable for use in complex working environments. The preparation process of this invention is simple and easy to implement, suitable for industrial production, and has broad application prospects and significant economic value.

[0023] 2) This invention significantly improves the antibacterial, flame-retardant, and mechanical properties of geotextiles by adding a modifier. The modifier is prepared by first treating nano-titanium dioxide with acid to activate its surface functional groups, thus increasing its surface activity. Then, surface treatment with 3-[3-carboxyallylamamido]propyltriethoxysilane introduces carbon-carbon double bonds and carboxyl groups onto its surface. Finally, an addition reaction with the antibacterial agent linalool is performed, facilitating the grafting of linalool onto nano-titanium dioxide to obtain modified nano-titanium dioxide. This improves the compatibility and antibacterial properties of nano-titanium dioxide with the polymer matrix, and the fatty acid chain of linalool facilitates its interaction with... The polymer matrix is ​​interwoven and entangled to improve the toughness and strength of the hot-melt geotextile, giving it higher tensile and tear resistance under complex working conditions. On the other hand, it is beneficial to subsequent reactions. Finally, the carboxyl groups in the modified nano-titanium dioxide react with guanidine aminosulfonate to obtain the modifier. The introduction of guanidine aminosulfonate helps to further improve the antibacterial and flame retardant properties of the hot-melt geotextile. It can work synergistically with nano-titanium dioxide and linalool to enable the hot-melt geotextile to maintain its antibacterial effect for a long time in complex environments, making it suitable for humid and heavily polluted environments. It also works synergistically with nano-titanium dioxide to improve the flame retardant properties of the hot-melt geotextile, allowing it to be applied to more complex working conditions. Detailed Implementation

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

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

[0026] The polyester, specifically polybutylene terephthalate (PET), is from Lanxess, Germany, model B3215, and was purchased from Jiangsu Weirun High Plastics Co., Ltd.

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

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

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

[0030] Example 1

[0031] A method for preparing a hot-melt geotextile includes 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 modifier, and 2g of butylated hydroxyanisole are mixed and melted to obtain a melt. The melt is then subjected to spinning, traction, web laying, needle punching, and hot rolling to obtain the hot-melt geotextile.

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

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

[0035] (2) 50g of pretreated nano-titanium dioxide was added to 300mL of 50wt% ethanol aqueous solution, and 7g of 3-[3-carboxyallylamido]propyltriethoxysilane was added. The mixture was heated at 50℃ for 3h, filtered, and the solid was collected. After washing and drying, the solid was added to 300mL of anhydrous ethanol, and 10.2g of linalool and 1.5g of benzoyl peroxide were added. The mixture was heated at 60℃ for 6h, filtered, and the solid was collected, washed, and dried to obtain modified nano-titanium dioxide.

[0036] (3) Add 36g of modified nano titanium dioxide to 200mL of water, add 26.5g of guanidine aminosulfonate and 12.6g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide, disperse by ultrasonication, heat at 50℃ for 2h, filter, collect the solid, wash and dry to obtain the modifier.

[0037] Example 2

[0038] A method for preparing a hot-melt geotextile includes 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 modifier, and 1g of pentaerythritol [β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid] are mixed and melted to obtain a melt. The melt is then subjected to spinning, traction, web laying, needle punching, and hot rolling to obtain the hot-melt geotextile.

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

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

[0042] (2) 40g of pretreated nano-titanium dioxide was added to 300mL of 50wt% ethanol aqueous solution, and 6g of 3-[3-carboxyallylamido]propyltriethoxysilane was added. The mixture was heated at 50℃ for 3h, filtered, and the solid was collected. After washing and drying, the solid was added to 300mL of anhydrous ethanol, and 8.2g of linalool and 1g of benzoyl peroxide were added. The mixture was heated at 60℃ for 6h, filtered, and the solid was collected, washed, and dried to obtain modified nano-titanium dioxide.

[0043] (3) Add 30g of modified nano titanium dioxide to 200mL of water, add 24g of guanidine aminosulfonate and 10.2g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide, disperse by ultrasonication, heat at 50℃ for 2h, filter, collect the solid, wash and dry to obtain the modifier.

[0044] Example 3

[0045] A method for preparing a hot-melt geotextile includes 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 modifier, and 3g of dioctadecyl thiodipropionate are mixed and melted to obtain a melt. The melt is then subjected to spinning, traction, web laying, needle punching, and hot rolling to obtain the hot-melt geotextile.

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

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

[0049] (2) 45g of pretreated nano-titanium dioxide was added to 300mL of 50wt% ethanol aqueous solution, and 6g of 3-[3-carboxyallylamido]propyltriethoxysilane was added. The mixture was heated at 50℃ for 3h, filtered, and the solid was collected. After washing and drying, the solid was added to 300mL of anhydrous ethanol, and 9g of linalool and 1g of benzoyl peroxide were added. The mixture was heated at 60℃ for 6h, filtered, and the solid was collected, washed, and dried to obtain modified nano-titanium dioxide.

[0050] (3) Add 40g of modified nano titanium dioxide to 200mL of water, add 30g of guanidine aminosulfonate and 15.9g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide, disperse by ultrasonication, heat at 50℃ for 2h, filter, collect the solid, wash and dry to obtain the modifier.

[0051] Comparative Example 1

[0052] A method for preparing a hot-melt geotextile, similar to Example 1, except that guanidine aminosulfonate is not added to the modifier, specifically including 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 modifier, and 2g of butylated hydroxyanisole are mixed and melted to obtain a melt. The melt is then subjected to spinning, traction, web laying, needle punching, and hot rolling to obtain the hot-melt geotextile.

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

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

[0056] (2) Add 50g of pretreated nano-titanium dioxide to 300mL of 50wt% ethanol aqueous solution, add 7g of 3-[3-carboxyallylamido]propyltriethoxysilane, heat at 50℃ for 3h, filter, collect the solid, wash and dry the solid, add it to 300mL of anhydrous ethanol, add 10g of linalool and 1.5g of benzoyl peroxide, heat at 60℃ for 6h, 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, similar to Example 1, except that the modifier is a mixture of nano-titanium dioxide and linalool in a mass ratio of 5:1, comprising 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 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. The melt is then subjected to spinning, traction, web laying, needle punching, and hot rolling to obtain the hot-melt geotextile.

[0060] Comparative Example 3

[0061] A method for preparing a hot-melt geotextile, similar to Example 1, except that the modifier is nano-titanium dioxide, includes 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. The melt is then subjected to spinning, traction, web laying, needle punching, and hot rolling 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, then immersed in water at 50°C, and subjected to a strength of 95 μW / cm. 2 After one month of exposure to ultraviolet light, its antibacterial and mechanical properties were tested.

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

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

[0067]

[0068] Antibacterial properties: The test was conducted according to GB / T20944.1-2007 "Evaluation of antibacterial properties of textiles - Part 1: Agar plate diffusion method", using Staphylococcus aureus (ATCC6538) as the test strain. A 25mm diameter hot-melt geotextile sample was incubated at 37℃ and 85% relative humidity for 24 hours to determine the width of the inhibition zone. The test results are shown in Table 2.

[0069] Table 2 Results of antibacterial performance test

[0070]

[0071] Limiting Oxygen Index (LOI) Test: The test was conducted using an oxygen index tester according to GB / 5454-1997 "Test for Burning Performance of Textiles - Oxygen Index Method". The sample size was 80mm × 300mm. A higher LOI value indicates better 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] As can be seen from the experimental results in Tables 1, 2, and 3, the hot-melt geotextile prepared by this invention has good mechanical, antibacterial, and flame-retardant properties. After being soaked in water at 50°C for one month, and with a strength of 95 μW / cm², it showed excellent performance. 2 It still has good mechanical and antibacterial properties after being exposed to ultraviolet light for one month.

[0075] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the patent protection scope of the present invention.

Claims

1. A hot-melt geotextile, characterized in that, It includes the following components in parts by weight: 10-20 parts polyester, 10-20 parts polypropylene, 4-8 parts 4080 low melting point fiber, 1-3 parts compatibilizer, 3-5 parts modifier, and 0.1-0.3 parts antioxidant. The preparation method of the modifier is as follows: (1) The nano-titanium dioxide was immersed in a dilute sulfuric acid aqueous solution, heated and stirred, cooled, allowed to stand, filtered, the solid was collected, washed, dried, ground and sieved to obtain pretreated nano-titanium dioxide; (2) Add the pretreated nano-titanium dioxide to an aqueous ethanol solution, add 3[3-carboxyallylamido]propyltriethoxysilane, heat to react, filter, collect the solid, wash and dry the solid, add it to anhydrous ethanol, add linalool and benzoyl peroxide, heat to react, filter, collect the solid, wash and dry to obtain modified nano-titanium dioxide. (3) Add the modified nano-titanium dioxide to anhydrous ethanol, add guanidine aminosulfonate and 1-ethyl-(3-dimethylaminopropyl)carbodiimide, disperse by ultrasonication, heat to react, filter, collect the solid, wash and dry to obtain the modifier; In step (1), the mass ratio of nano-titanium dioxide to dilute sulfuric acid aqueous solution is 1:5-10; The concentration of the dilute sulfuric acid aqueous solution in step (1) is 10-20 wt%; the heating temperature is 40-60℃. In step (2), the mass ratio of pretreated nano-titanium dioxide, 3[3-carboxyallylamido]propyltriethoxysilane, and linalool is 20-30:3-4:4-6. In step (3), the mass ratio of modified nano-titanium dioxide, guanidine aminosulfonate, and 1-ethyl-(3-dimethylaminopropyl)carbodiimide is 15-20:12-15:5-8.

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 either copolymer polypropylene or homopolymer polypropylene.

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

5. A method for preparing the hot-melt geotextile according to any one of claims 1-4, characterized in that, The process includes the following steps: mixing and melting polyester, polypropylene, 4080 low-melting-point fiber, compatibilizer, modifier, and antioxidant to obtain a melt, which is then sequentially processed through spinning, traction, web laying, needle punching, and hot rolling to obtain the hot-melt geotextile.

Images