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CN-121992533-A - Anti-phenol-yellowing polypropylene staple fiber and preparation method thereof

CN121992533ACN 121992533 ACN121992533 ACN 121992533ACN-121992533-A

Abstract

The invention discloses an anti-phenol yellowing polypropylene short fiber and a preparation method thereof, belonging to the technical field of high-performance polypropylene, wherein 2, 3-naphthalic anhydride reacts with 1-methyl-1-phenylhydrazine to generate an open-loop intermediate containing naphthalene ring and hydrazide structure, the open-loop intermediate is esterified with compound fatty alcohol of hexadecanol and 2-octyl dodecanol to obtain an anti-phenol yellowing agent, the anti-phenol yellowing agent is compounded with low-viscosity mineral white oil, caprylic-capric acid glyceride, polyethylene glycol fatty acid ester, polyisobutylene succinimide and lauryl phosphate monoester potassium salt to form an oil-based anti-phenol yellowing functional agent, and the oil-based anti-phenol yellowing agent is coated on the surface of the polypropylene fiber through a cluster oiling process. Compared with the prior art, the invention realizes double synergy of compact barrier and uniform coverage, enhances the anchoring capability of the functional film, and the obtained polypropylene short fiber phenol yellowing grade reaches 4.5 grade, has no attenuation after water immersion resistance, the breaking strength is more than or equal to 4.5cN/dtex, and the breaking elongation is more than or equal to 40%.

Inventors

  • DU JINFENG
  • CHEN ZHIQIANG
  • LUO ZHENGFEI

Assignees

  • 湖北博韬合纤股份有限公司

Dates

Publication Date
20260508
Application Date
20260409

Claims (10)

  1. 1. A preparation method of anti-phenol yellowing polypropylene staple fiber is characterized in that the method comprises the following steps, Step 1, carrying out melt extrusion on polypropylene slices, and then carrying out melt extrusion to form primary filaments, wherein the primary filaments are cooled and solidified, and the cooled filaments immediately pass through bundling and oiling, wherein the oil is an oil-based anti-phenolic yellowing functional agent; Step 2, drafting and thermal relaxation setting are carried out on the primary tows obtained after oiling in the step 1, the continuous tows after drafting setting are cut into short fibers, and after drying, the anti-phenol yellowing polypropylene short fibers are obtained; the preparation method of the oil-based anti-phenolic yellowing functional agent comprises the following steps: Heating and stirring low-viscosity mineral white oil and caprylic/capric glyceride, adding an anti-phenolic yellowing agent, adding polyethylene glycol fatty acid ester, an auxiliary surfactant and lauryl monoester potassium phosphate, and stirring to obtain an oil-based anti-phenolic yellowing functional agent; the preparation method of the anti-phenolic yellowing agent comprises the following steps: Reacting 2, 3-naphthalic anhydride with 1-methyl-1-phenylhydrazine in a solvent to obtain an intermediate, reacting the intermediate with fatty alcohol, and performing aftertreatment to obtain the anti-phenolic yellowing agent; The fatty alcohol consists of cetyl alcohol and 2-octyl dodecanol; the auxiliary surfactant is polyisobutylene succinimide.
  2. 2. The method for preparing the anti-phenol-yellowing polypropylene staple fiber according to claim 1, wherein the method comprises the following steps of, Step 1, conveying polypropylene slices into a single screw extruder for melt extrusion, then conveying the melt into a spinning box with constant temperature, quantitatively conveying the melt to a spinneret plate through a metering pump, extruding to form primary filaments, uniformly cooling and solidifying the extruded primary filaments in a side blowing window system, immediately oiling the cooled filaments through bundling, wherein the oil is an oil-based anti-phenolic yellowing functional agent, preheating the oil-based anti-phenolic yellowing functional agent to 35-45 ℃, and controlling the oiling rate to be 1.8% -2.5%; and 2, directly introducing the primary tows obtained after oiling in the step 1 into a multistage hot roller drafting machine for drafting and shaping, and then cutting the continuous tows after drafting and shaping into short fibers by a cutting machine, and drying to obtain the anti-phenol yellowing polypropylene short fibers.
  3. 3. The method for preparing the anti-phenolic-yellowing polypropylene short fiber according to claim 2, wherein the temperature of six temperature zones from feeding to extrusion of the single screw extruder is precisely controlled to 220-230 ℃, 235-245 ℃, 245-255 ℃, 250-260 ℃, 245-255 ℃ and 245-255 ℃ in sequence.
  4. 4. The method for preparing anti-phenolic-yellowing polypropylene staple fiber according to claim 2, wherein the temperature of the spinning beam is constant at 240-250 ℃.
  5. 5. The method for preparing the anti-phenol yellow polypropylene staple fiber according to claim 2, wherein the side blowing temperature of the side blowing window system is set to be 15-25 ℃ and the wind speed is 0.4-0.8m/s, so that the temperature of the primary filaments is reduced to be below 65 ℃.
  6. 6. The method for preparing anti-phenolic-yellowing polypropylene staple fiber according to claim 2, wherein the total draft multiple of the multi-stage hot roller draft machine is set to 3-6 times, the draft linear speed is kept at 500-2000m/min, the temperature of the multi-stage hot rollers is sequentially set to 70-80 ℃ for one roller, 110-120 ℃ for two rollers, 120-140 ℃ for three rollers, and 120-130 ℃ for a sizing tail roller.
  7. 7. The method for preparing the anti-phenol-yellowing polypropylene short fiber according to claim 2, wherein the length of the anti-phenol-yellowing polypropylene short fiber is 33-42mm, and the linear density is 1.8-2.5dtex.
  8. 8. The method for preparing the anti-phenolic-yellowing polypropylene short fiber according to claim 1, wherein the preparation method of the oil-based anti-phenolic-yellowing functional agent comprises the following steps of: Preparing a blending kettle, sequentially adding 500-800 parts of low-viscosity mineral white oil and 100-200 parts of caprylic/capric glyceride as base oil, heating to 50-70 ℃, adding 80-120 parts of anti-phenolic yellowing agent under 200-400r/min dispersion stirring to enable the anti-phenolic yellowing agent to be completely melted and dissolved in an oil phase, then adding 60-100 parts of polyethylene glycol fatty acid ester, 5-15 parts of auxiliary surfactant and 15-25 parts of lauryl monoester potassium phosphate, and continuously stirring at a constant speed for 20-50 minutes to obtain the oil-based anti-phenolic yellowing functional agent.
  9. 9. The method for preparing the anti-phenolic-yellowing polypropylene short fiber according to claim 1, wherein the preparation method of the anti-phenolic-yellowing agent comprises the following steps: S1, adding 2, 3-naphthalic anhydride and 1-methyl-1-phenylhydrazine into an ethanol aqueous solution with the weight of 40-70 percent which is 3-5 times of the total weight of monomers according to the molar ratio of 0.5-2:0.5-2, stirring for 1-3 hours at the temperature of 30-50 ℃ at the speed of 50-150r/min, naturally cooling to room temperature after the reaction is finished, and removing the solvent by rotary evaporation at the low temperature of 40-50 ℃ to obtain an intermediate; S2, putting the intermediate obtained in the step S1 and fatty alcohol into a reaction kettle according to the molar ratio of 0.5-2:0.5-2, heating to 70-85 ℃ under the protection of nitrogen, preserving heat for 30-80r/min, stirring, adding p-toluenesulfonic acid accounting for 0.3-0.8% of the total weight of reactants as a catalyst after the materials are completely melted into a liquid state, heating to 110-120 ℃ under the protection of nitrogen, reacting for 2-6 hours, removing generated by-product water in real time through a water separator during the reaction, pouring the materials into absolute ethyl alcohol while the materials are hot after the reaction is finished, cooling and crystallizing, filtering and drying to obtain the anti-phenol yellowing agent; The fatty alcohol is composed of hexadecanol and 2-octyl dodecanol according to the mol ratio of 0.5-2:0.5-2.
  10. 10. The anti-phenol-yellowing polypropylene short fiber is characterized by being prepared by adopting the preparation method of any one of claims 1-9, and comprises a polypropylene fiber substrate and an oil-based anti-phenol-yellowing functional agent uniformly anchored on the surface of the substrate, wherein the oil-based anti-phenol-yellowing functional agent comprises an anti-phenol-yellowing agent and a co-surfactant polyisobutylene succinimide, the preparation raw materials of the anti-phenol-yellowing agent comprise hexadecanol and 2-octyl dodecanol, and the phenol-yellowing grade of the anti-phenol-yellowing polypropylene short fiber is more than or equal to 4.5.

Description

Anti-phenol-yellowing polypropylene staple fiber and preparation method thereof Technical Field The invention relates to the technical field of high-performance polypropylene fibers, in particular to an anti-phenol yellowing polypropylene staple fiber and a preparation method thereof. Background The polypropylene short fiber is widely applied to the fields of textile fabrics, home decorations, industrial fabrics, automobile interiors and the like by virtue of the advantages of low density, high mechanical strength, excellent chemical corrosion resistance and the like. However, because the molecular structure of polypropylene lacks polar groups, the fiber is easy to yellow under the actions of oxygen, nitrogen oxides and the like in the high-temperature environment of melt spinning and the subsequent storage and use process, and the quality of white and light-colored products is seriously affected, so that the anti-phenolic yellowing performance gradually becomes a key bottleneck for restricting the upgrading of the polypropylene short fiber products. The prior patent with publication number CN115747994A discloses an anti-phenol yellowing polypropylene filament and a preparation method thereof, wherein an anti-phenol yellowing oiling agent containing SOPE series emulsifying agent, fatty acid polyethylene glycol ester, sulfo amphoteric surfactant and other components is used in the oiling process, so that the phenol yellowing grade of the polypropylene filament reaches more than 4 grades, but the technology is mainly applicable to continuous filament products, the anti-yellowing function of the anti-phenol yellowing polypropylene filament depends on the physical compounding of the oiling agent components, and the combination of a functional agent and a fiber substrate lacks chemical anchoring effect. The patent with publication number CN111663331A discloses a novel nylon anti-phenolic yellowing agent, which is prepared by compounding raw materials such as isooctyl alcohol sulfate sodium salt, alcohol ether carboxylate and the like, so that the anti-phenolic yellowing grade of the finished cloth surface reaches about 4.5 grade, but the application object is nylon fabric, and the water-based finishing system cannot be directly adapted to polypropylene fibers with extremely strong hydrophobicity. The patent with publication number CN116023293A discloses a naphthalene ring nylon thermal yellowing resistant agent, which adopts 1, 8-naphthalene dicarboxylic anhydride and unsymmetrical dimethylhydrazine to react to generate an open-loop product containing carboxyl and hydrazido, so that an acidic yellowing substance can be effectively captured, but the technology is also aimed at nylon fabrics and mainly solves the thermal yellowing problem, and the water-soluble product has poor compatibility with polypropylene fiber base materials, so that stable adhesion is difficult to form on the surface of the fibers. In summary, the existing anti-yellowing technology is mostly aimed at nylon fabrics or polypropylene filaments, and lacks a special scheme suitable for polypropylene staple fibers and compatible with function durability. How to stably combine the anti-yellowing phenol functional agent with a polypropylene substrate with strong hydrophobicity through molecular structure design and realize the cooperative promotion of the anti-yellowing performance and the water durability is a technical problem to be solved in the current field. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide an anti-phenol yellowing polypropylene short fiber and a preparation method thereof. In order to achieve the above object, the present invention adopts the following technical scheme: A process for preparing the short anti-phenolic yellowing polypropylene fibres, Step 1, carrying out melt extrusion on polypropylene slices, and then carrying out melt extrusion to form primary filaments, wherein the primary filaments are cooled and solidified, and the cooled filaments immediately pass through bundling and oiling, wherein the oil is an oil-based anti-phenolic yellowing functional agent; and 2, carrying out high-power orientation stretching and thermal relaxation shaping on the primary tows obtained after oiling in the step 1, cutting the continuous tows after stretching shaping into short fibers, and drying to obtain the anti-phenol yellowing polypropylene short fibers. The preparation method of the oil-based anti-phenolic yellowing functional agent comprises the following steps: sequentially adding low-viscosity mineral white oil and caprylic/capric glyceride as base oil, heating and stirring, adding anti-phenolic yellowing agent, adding polyethylene glycol fatty acid ester, auxiliary surfactant and lauryl monoester potassium phosphate, and continuously stirring at constant speed to obtain the oil-based anti-phenolic yellowing functional agent. The preparation method of the anti-phenolic yellowing a