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Preparation method for halogen-free flame-retardant polypropylene fibers

A flame-retardant polypropylene and polypropylene chip technology, which is applied in the manufacture of fire-retardant and flame-retardant filaments, single-component polyolefin rayon, chemical post-processing of synthetic polymer rayon, etc. Material cost, influence on flame retardant performance and other issues, to achieve a wide range of applications, reduce production costs, and good flame

Inactive Publication Date: 2011-08-10
SICHUAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High flame retardant addition has a great influence on the mechanical properties of polypropylene, and greatly increases the cost of materials
When the content of intumescent flame retardant in polypropylene is low, the thickness of the foamed carbon layer formed during combustion is relatively thin. When polypropylene is burned, it is heated and melted, and the thinner foamed carbon layer is unstable on the melt surface and is easy to slip or fall. Cracks affect the flame retardant performance

Method used

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  • Preparation method for halogen-free flame-retardant polypropylene fibers
  • Preparation method for halogen-free flame-retardant polypropylene fibers
  • Preparation method for halogen-free flame-retardant polypropylene fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Cut 55 kg of PP, 35 kg of compound intumescent flame retardant (ammonium polyphosphate: pentaerythritol: melamine = 6:1: 3), 8.5 kg of EVA, 1.48 kg of antioxidant 1010, 0.02 kg of hydroxyphenyl benzotriazole The azole ultraviolet absorber is uniformly mixed and then mixed and granulated by a twin-screw extruder at a temperature of 210-230° C. to obtain a PP expansion flame-retardant master batch. Blend 100kg flame-retardant masterbatch with 700kg PP chips, the screw temperature is controlled at 195~230℃, the metering pump specification is 0.6ml / r, the metering pump revolution is 10r / min, the spinneret hole diameter is 0.6mm, the number of holes is 16, The spinning speed is 133m / min, the winding speed is 300m / min, and the tow is heated for 4 times after winding to obtain flame-retardant PP raw yarn. The original filaments are bundled and formed into tow sheets with a thickness of 1mm, which are continuously fed into low-energy electron beam irradiation equipment for conti...

Embodiment 2

[0037] Cut 60 kg of PP, 33 kg of compound intumescent flame retardant (triphenyl phosphate: neopentyl glycol: melamine = 8: 0.5: 1.5), 6 kg of PP wax, 0.98 kg of composite antioxidant 215, 0.02 kg The hydroxyphenyl benzotriazole ultraviolet absorber is uniformly mixed and then mixed and granulated through a twin-screw extruder at a temperature of 210-230° C. to obtain a PP expansion flame-retardant master batch. Blend 100kg flame-retardant masterbatch with 300kg PP chips, the screw temperature is controlled at 195~230℃, the metering pump specification is 0.6ml / r, the metering pump revolution is 10r / min, the spinneret hole diameter is 0.6mm, and the number of holes is 16. The spinning speed is 133m / min, the winding speed is 300m / min, and the tow is heated for 4 times after winding to obtain flame-retardant PP raw yarn. The original filaments are bundled into a tow sheet with a thickness of 1mm, which is continuously fed into a low-energy electron beam irradiation equipment for c...

Embodiment 3

[0039] Cut 50 kg of PP, 40 kg of compound intumescent flame retardant (melamine polyphosphate: pentaerythritol: melamine = 7:1: 2), 8.6 kg of PP wax, 1.38 kg of composite antioxidant 225, 0.02 kg of hydroxyphenylbenzene The triazole ultraviolet absorber is uniformly mixed and then mixed and granulated by a twin-screw extruder at a temperature of 210-230° C. to obtain a PP expanded flame-retardant master batch. Blend 100kg flame-retardant masterbatch with 800kg PP chips, the screw temperature is controlled at 195~230℃, the metering pump specification is 0.6ml / r, the metering pump revolution is 10r / min, the spinneret hole diameter is 0.8mm, the number of holes is 8. The spinning speed is 149m / min, the winding speed is 400m / min, and the tow is subjected to 3 times hot drawing after winding to obtain flame-retardant PP raw yarn. The original filaments are bundled into a tow sheet with a thickness of 1mm, which is continuously fed into a low-energy electron beam irradiation equipmen...

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Abstract

The invention discloses a preparation method for halogen-free flame-retardant polypropylene fibers. The preparation method is characterized by comprising the following steps of: melting, mixing, extruding and granulating 30 to 60 weight parts of polypropylene slices, 30 to 68.5 weight parts of intumescent flame retardant and 1.5 to 10 weight parts of additives in a twin-screw extruder at the temperature of 210 to 230 DEG C to obtain intumescent flame-retardant master batches; after mixing 10 to 25 weight parts of the flame-retardant master batches and 75 to 90 weight parts of the polypropylene slices, spinning by using a melt-spinning machine; after beaming the prepared halogen-free flame-retardant polypropylene protofilaments, feeding the beamed halogen-free flame-retardant polypropyleneprotofilaments into electronic irradiation equipment for performing irradiation cross-linking treatment, wherein the thickness of tow is made below 2 mm by using shaping equipment and the irradiationmeasurement is 50 to 400 kGy when irradiating; and obtaining the finished halogen-free flame-retardant polypropylene protofilaments by winding the irradiated fibers, wherein the finished fibers have the fineness of 0.5 to 100 dtex, the strength of 2 to 9 cN / dtex, and the breaking elongation of 5 to 18 percent, and the limiting oxygen index of the fibers is 28 to 34.

Description

Technical field [0001] The invention relates to a preparation method of halogen-free flame-retardant polypropylene (PP) fiber. It belongs to the field of preparation of halogen-free flame-retardant fibers. Background technique [0002] Polypropylene officially began industrial production in 1957 and is a rising star among synthetic fibers. Polypropylene has the characteristics of simple production process, low relative density (0.91g / ml), low raw material and production costs, and high fiber strength, so it has developed rapidly. At present, polypropylene is the fourth largest variety of synthetic fibers. The biggest shortcoming of polypropylene is its flammability. Polypropylene is a polymer material containing only hydrocarbon elements. It has a low oxygen index (only about 18) and is extremely combustible. It also generates a large amount of heat during combustion and produces a large number of droplets. Easy to spread flame. The flammable properties of polypropylene have l...

Claims

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Application Information

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IPC IPC(8): D01F6/46D01F1/07D01F11/06
Inventor 姜猛进傅峰徐建军叶光斗吴道发戴靖
Owner SICHUAN UNIV
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