Preparation method of flame-retardant polypropylene filament geotextile

Abstract

The invention belongs to the technical field of preparation of filament geotextile, and particularly relates to a preparation method of flame-retardant polypropylene filament geotextile. The preparation method of the flame-retardant polypropylene filament geotextile is characterized by comprising the following steps: (1) uniformly dispersing a flame retardant into polypropylene resin, and extruding the polypropylene resin to prepare flame-retardant master batches; (2) mixing the flame-retardant master batch with polypropylene, and spinning polypropylene filaments; (3) lapping polypropylene filaments, and needling to prepare a polypropylene filament geotextile; and (4) coating the surface of the polypropylene filament geotextile with a flame-retardant coating. The polypropylene filament geotextile has the beneficial effects that the flame-retardant grade of the polypropylene filament geotextile is remarkably improved, and the fire risk is effectively reduced. The original excellent performances such as tensile strength, corrosion resistance, permeability and construction convenience are maintained. The requirements of the market on high-performance and high-safety geotextile materials are met, and the market competitiveness of the product is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of filament geotextile preparation, and in particular relates to a method for preparing flame-retardant polypropylene filament geotextile. Background Art

[0002] As a high-performance geosynthetic, polypropylene filament geotextiles are widely used in engineering fields such as water conservancy, transportation, construction, and environmental protection due to their excellent tensile strength, corrosion resistance, permeability, and ease of construction. However, polypropylene is inherently flammable. Under certain environmental conditions (such as high temperatures, near fire sources, or in areas requiring fire prevention measures), its flammability can easily lead to fire risks, posing a potential threat to project safety and human life and property. Therefore, improving the flame retardant properties of polypropylene filament geotextiles is an urgent issue in current industry research and application. Summary of the Invention

[0003] In order to make up for the deficiencies of the prior art, the present invention provides a method for preparing a flame retardant polypropylene filament geotextile.

[0004] The present invention is achieved through the following technical solutions: A method for preparing a flame-retardant polypropylene filament geotextile is characterized by comprising the following steps: (1) Evenly disperse the flame retardant into the polypropylene resin and extrude it into a flame retardant masterbatch; (2) Mix the flame retardant masterbatch with polypropylene to spin polypropylene filaments; (3) Spreading and needle-punching polypropylene filaments to make polypropylene filament geotextiles; (4) Apply a flame retardant coating on the surface of polypropylene filament geotextile.

[0005] Preferably, in step (1), the flame retardant used is octabromoether, and the mass ratio of octabromoether to polypropylene resin is 8-10:90-92.

[0006] Preferably, in step (1), the mass ratio of octabromoether to polypropylene resin is 9:91.

[0007] Preferably, in step (1), antimony trioxide is added after octabromoether and polypropylene resin are dispersed and mixed.

[0008] Preferably, in step (1), the mass ratio of antimony trioxide to octabromoether is 1-2:3.

[0009] Preferably, in step (1), the mass ratio of antimony trioxide to octabromoether is 1.5:3.

[0010] Preferably, in step (2), the mass ratio of flame retardant masterbatch to polypropylene is 4-6:94-96.

[0011] Preferably, in step (2), the mass ratio of flame retardant masterbatch to polypropylene is 5:95.

[0012] Preferably, in step (4), the coating temperature is 110-150° C., and after coating, the coating is kept at the coating temperature for 2-5 minutes, and the coating thickness is 1-1.2 mm.

[0013] Preferably, in step (4), the coating temperature is 130° C., and after coating, the coating temperature is maintained for 4 minutes, and the coating thickness is 1.1 mm.

[0014] The beneficial effects of the present invention are as follows: by adding flame retardants and applying a surface coating, the flame retardancy rating of polypropylene filament geotextiles is significantly improved, effectively reducing the risk of fire. The flame retardant treatment process has minimal impact on the geotextile's physical and mechanical properties, maintaining its original excellent properties such as tensile strength, corrosion resistance, permeability, and ease of construction. The added flame retardants are all environmentally friendly materials that are non-toxic, harmless, and environmentally friendly, conforming to the development trend of modern green building materials. This meets the market demand for high-performance, high-safety geotextile materials and enhances the product's market competitiveness. DETAILED DESCRIPTION

[0015] Example 1: 8 kg of octabromoether was evenly dispersed in 90 kg of polypropylene resin. After mixing, 2.67 kg of antimony trioxide was added and extruded to produce a flame-retardant masterbatch. 4 kg of the flame-retardant masterbatch was mixed with 94 kg of polypropylene to produce polypropylene filaments. The polypropylene filaments were laid out and needle-punched to produce a polypropylene filament geotextile. A 1 mm flame-retardant coating was applied to the surface of the polypropylene filament geotextile at a temperature of 110°C. After coating, the coating was maintained at 110°C for 2 minutes.

[0016] Example 2: 10 kg of octabromoether was evenly dispersed in 92 kg of polypropylene resin. After mixing, 6.67 kg of antimony trioxide was added and extruded to produce a flame-retardant masterbatch. 6 kg of the flame-retardant masterbatch was mixed with 96 kg of polypropylene to produce polypropylene filaments. The polypropylene filaments were laid out and needle-punched to produce a polypropylene filament geotextile. A 1.2 mm flame-retardant coating was applied to the surface of the polypropylene filament geotextile at a temperature of 150°C. After coating, the coating was maintained at 150°C for 5 minutes.

[0017] Example 3: 9 kg of octabromoether was evenly dispersed in 91 kg of polypropylene resin. After mixing, 4.5 kg of antimony trioxide was added and extruded to produce a flame-retardant masterbatch. 5 kg of the flame-retardant masterbatch was mixed with 95 kg of polypropylene to produce polypropylene filaments. The polypropylene filaments were laid out and needle-punched to produce a polypropylene filament geotextile. A 1.1 mm flame-retardant coating was applied to the surface of the polypropylene filament geotextile at a temperature of 130°C. After coating, the coating was maintained at 130°C for 4 minutes.

[0018] Example 4: 8 kg of octabromoether was evenly dispersed in 92 kg of polypropylene resin. After mixing, 2.67 kg of antimony trioxide was added and extruded to produce a flame-retardant masterbatch. 4 kg of the flame-retardant masterbatch was mixed with 96 kg of polypropylene to produce polypropylene filaments. The polypropylene filaments were laid out and needle-punched to produce a polypropylene filament geotextile. A 1 mm flame-retardant coating was applied to the surface of the polypropylene filament geotextile at a temperature of 110°C. After coating, the coating was maintained at 110°C for 5 minutes.

[0019] Example 5: 10 kg of octabromoether was evenly dispersed in 90 kg of polypropylene resin. After mixing thoroughly, 5 kg of antimony trioxide was added and extruded to produce a flame-retardant masterbatch. 6 kg of the flame-retardant masterbatch was mixed with 94 kg of polypropylene to produce polypropylene filaments. The polypropylene filaments were laid out and needle-punched to produce a polypropylene filament geotextile. A 1.2 mm flame-retardant coating was applied to the surface of the polypropylene filament geotextile at a temperature of 150°C. After coating, the coating was maintained at 150°C for 2 minutes.

Claims

1. A method for preparing a flame-retardant polypropylene filament geotextile, characterized in that: The following steps are involved: (1) Evenly disperse the flame retardant into the polypropylene resin and extrude it into a flame retardant masterbatch; (2) Mix the flame retardant masterbatch with polypropylene to spin polypropylene filaments; (3) Spreading and needle-punching polypropylene filaments to make polypropylene filament geotextiles; (4) Apply a flame retardant coating on the surface of polypropylene filament geotextile.

2. The method for preparing the flame retardant polypropylene filament geotextile according to claim 1, wherein: In step (1), the flame retardant used is octabromoether, and the mass ratio of octabromoether to polypropylene resin is 8-10:90-92.

3. The method for preparing the flame-retardant polypropylene filament geotextile according to claim 2, wherein: In step (1), the mass ratio of octabromoether to polypropylene resin is 9:

91.

4. The method for preparing the flame-retardant polypropylene filament geotextile according to claim 1, wherein: In step (1), octabromoether and polypropylene resin are dispersed and mixed, and then antimony trioxide is added.

5. The method for preparing the flame-retardant polypropylene filament geotextile according to claim 4, wherein: In step (1), the mass ratio of antimony trioxide to octabromoether is 1-2:

3.

6. The method for preparing the flame-retardant polypropylene filament geotextile according to claim 5, wherein: In step (1), the mass ratio of antimony trioxide to octabromoether is 1.5:

3.

7. The method for preparing the flame-retardant polypropylene filament geotextile according to claim 1, wherein: In step (2), the mass ratio of flame retardant masterbatch to polypropylene is 4-6:94-96.

8. The method for preparing the flame-retardant polypropylene filament geotextile according to claim 7, wherein: In step (2), the mass ratio of flame retardant masterbatch to polypropylene is 5:

95.

9. The method for preparing the flame retardant polypropylene filament geotextile according to claim 1, wherein: In step (4), the coating temperature is 110-150°C, and after coating, the coating temperature is kept at the coating temperature for 2-5 minutes, and the coating thickness is 1-1.2 mm.

10. The method for preparing the flame retardant polypropylene filament geotextile according to claim 9, characterized in that: In step (4), the coating temperature is 130°C, and after coating, the coating is kept at the coating temperature for 4 minutes. The coating thickness is 1.1 mm.