CN-122013388-A - PBO composite fiber and preparation method thereof

Abstract

The application discloses a PBO composite fiber and a preparation method thereof, wherein the PBO composite fiber comprises PBO fiber, para-aramid fiber and flame-retardant viscose fiber, and the weight content of the PBO fiber is at least 20 percent. On the basis of keeping the ultra-high strength and high modulus of the PBO fiber, the application obviously improves the wear resistance, the light resistance and the compression performance, endows permanent and more balanced flame retardant performance, and simultaneously effectively reduces the cost.

Inventors

• JIN GUANGNAN
• CHEN HUI

Assignees

• 上海邃铸科技有限公司

Dates

Publication Date

20260512

Application Date

20251230

Claims (10)

1. 1. A PBo composite fiber, which is characterized by comprising PBO fiber, para-aramid fiber and flame-retardant viscose fiber, wherein the weight content of the PBO fiber is at least 20 percent.
2. 2. The PBO composite fiber of claim 1, wherein the filament strength of the PBO fiber is greater than or equal to 5.0Gpa and the filament modulus of the PBO fiber is greater than or equal to 180Gpa.
3. 3. The PBO composite fiber according to claim 1, wherein in the PBO composite fiber, the PBO fiber weight content is 20 to 80%, the para-aramid fiber weight content is 15 to 55%, and the flame retardant viscose fiber weight content is 5 to 35%.
4. 4. The PBO composite fiber of claim 1, further comprising one or more of a penetrating agent, an antistatic agent, a flame retardant, a lubricant, a coupling agent in the PBO composite fiber.
5. 5. The PBO composite fiber according to claim 4, wherein the penetrating agent is one or more selected from the group consisting of fatty alcohol-polyoxyethylene ether, alkylphenol-polyoxyethylene ether, and/or The flame retardant may be one or more combinations of phosphorus based flame retardants, nitrogen based flame retardants, halogen based flame retardants, inorganic oxide flame retardants, inorganic hydroxide flame retardants, borate flame retardants, sulfonate salt flame retardants, silicon based flame retardants, intumescent flame retardants.
6. 6. A method of making the PBO composite fiber of claim 1, comprising: mixing the fibers contained in the PBO composite fibers to prepare a mixed roll; Spinning to obtain yarn; Soaking the yarns in the finishing liquid to absorb the finishing liquid, and then rolling to remove part of the finishing liquid; And drying the rolled yarn.
7. 7. The method of claim 6, wherein prior to blending, one or more of the BPO fibers, para-aramid fibers, flame retardant adhesive fibers is applied with a base oil comprising a lubricant and the antistatic agent, wherein the base oil has an oil application rate of 0.3 to 0.5wt%; Before blending, one or more of the BPO fiber, the para-aramid fiber and the flame-retardant adhesive fiber are subjected to surface modification treatment, wherein the surface modification treatment adopts an impregnation or spray mode to apply a coupling agent oil agent, and the oil application rate of the coupling agent oil agent is 0.1-2wt%; The application of the "coupling agent finish" is performed either before, after, or simultaneously with the application of the base finish.
8. 8. The method according to claim 6, wherein the pH of the finishing liquor is 5.5-6.5, and/or The finishing liquid also contains a penetrating agent, wherein the concentration of the penetrating agent in the finishing liquid is 1-5g/L; The finishing liquid also contains a flame retardant, and the concentration of the flame retardant in the finishing liquid is 100-300g/L.
9. 9. The method according to claim 6, wherein the impregnating and rolling are performed more than once independently, and the impregnating and rolling are performed alternately, and the rolling surplus is 65-90%.
10. 10. The method according to claim 6, wherein the rolled yarn is further pre-dried before being dried, wherein the pre-dried temperature is 80-120 ℃, the pre-dried time is 1-5 minutes, the dried temperature is 150-200 ℃, the dried time is 1-10 minutes, and the drying and the pre-drying are respectively and independently performed under inert gas atmosphere.

Description

PBO composite fiber and preparation method thereof Technical Field The invention relates to a high-strength high-modulus flame-retardant fiber, belongs to the technical field of high-performance materials, and particularly relates to a PBO composite fiber and a preparation method thereof. Background The poly-p-Phenylene Benzobisoxazole (PBO) fiber is a polyamide containing heterocyclic aromatic, is one of organic fibers with highest strength and modulus in the current commercial fibers, has the strength of up to 5.8GPa, the modulus of up to 270GPa, the Limiting Oxygen Index (LOI) of up to 68 percent, and the heat-resistant temperature of up to 600 ℃, has excellent flame retardance and thermal stability, does not burn and shrink in flame, is known as super fiber of 21 st century, and has important application value in the fields of aerospace, military national defense, transportation, sports equipment, building materials, high-temperature protection and the like. However, the PBO fiber has some remarkable disadvantages of extremely high price, limitation of large-scale application, poor wear resistance and light resistance, degradation of performance under repeated friction or long-term ultraviolet irradiation, and relatively weak compression performance and shearing resistance, and particularly, poor spinning/spinning performance (spinnability) of PBO, poor spinnability, poor wear resistance, poor tear strength, large mechanical abrasion and the like, thereby reducing the service performance of PBO. At present, single fiber is difficult to meet the increasingly harsh requirements of the special protection field on the comprehensive properties of materials. For example, CN101649553B is prepared into a composite material by utilizing liquid rubber modified PBO fiber containing carboxyl end groups, and the shearing strength of the PBO fiber is improved to 26-29MPa. There are some attempts to blend high performance fibers, for example, CN105113073B untwists and twists quartz fibers and PBO fiber precursor filaments according to a certain proportion, and then performs doubling and twisting on a certain number of blended primary twisted yarns to make a quartz fiber blended yarn, and combines the respective advantages of the two fibers. CN113375504A blends the ultra-high molecular weight polyethylene fiber, aramid fiber, carbon fiber, PBO fiber and a small amount of polybutylene terephthalate fiber uniformly, so that the overall structural performance is improved, and the density is reduced. CN104862826A utilizes a small amount of PIPD and PBO to prepare blend fiber, and improves the infiltration performance of PBO and the bonding performance with a resin matrix. EP0790339B1 blends stainless steel fibers and PBO fibers to prepare high-temperature-resistant blended yarns. JP5257379B2 uses rock wool and PBO to make multi-layer woven cloth, and is impregnated with phenolic resin. There are also techniques for blending aramid fibers with PBO, for example, JP2008-517181A blends para-aramid fibers, meta-aramid fibers, and PBO fibers to produce flame retardant fibers. However, how to obtain the composite fiber with optimal comprehensive performance by scientific formula design and technological innovation, on the premise of not sacrificing the ultra-high performance of the PBO fiber, the defects of the PBO fiber are effectively overcome, the comprehensive cost is reduced, and the synergistic effect of the performances of the fiber components is realized, so that the technical problem to be solved in the field is still solved. Disclosure of Invention The PBO composite fiber and the preparation method thereof provided by the invention have the advantages that the wear resistance, the light resistance and the compression performance are obviously improved on the basis of keeping the ultra-high strength and the high modulus of the PBO fiber, the permanent and more balanced flame retardant performance is endowed, and meanwhile, the cost is effectively reduced. The first aspect of the invention provides a PBO composite fiber, which comprises PBO fiber, para-aramid fiber and flame-retardant viscose fiber, wherein the weight content of the PBO fiber is at least 20 percent. In a preferred embodiment, the PBO fibers have a filament strength of 5.0GPa or more, more preferably 5.5GPa or more, and still more preferably 6GPa or more. In a preferred embodiment, the monofilament modulus of the PBO fibers is 180GPa or more, more preferably 190GPa or more, and even more preferably 120GPa or more. In a preferred embodiment, the PBO composite fibers preferably comprise 20-80% PBO fibers by weight, more preferably 20-70% PBO fibers by weight, more preferably 20-60% PBO fibers by weight, more preferably 30-60% PBO fibers by weight, such as 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80% PBO fibers by weight. In a preferred embodiment, the para-aramid fiber is a para-wholly aromatic polyamide fiber, such as poly (paraphenylene