Polyvinyl alcohol fibers and meltblown fiber products

By providing a homopolypolyvinyl alcohol composition with high hydrolysis and adopting a meltblown process, the problem of degradation of polyolefin nonwoven fibers in the prior art at high temperature is solved, and the manufacturing of high-performance homopolypolyvinyl alcohol fibers is realized.

CN119731382APending Publication Date: 2025-03-28AQUAPAK IP LTD
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Patent Information

Application Number
CN202380059582.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2022-08-13
Filing Date
2023-08-11
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The prior art is difficult to effectively use homopolypolyvinyl alcohol with high hydrolysis to produce processable polyolefin nonwoven fibers, and traditional methods tend to lead to polymer degradation at high temperatures.

Method used

Using a method, a homopolymer polyvinyl alcohol composition containing 88% to 98% hydrolysis is provided and melted into a molten polymer at a temperature of 190°C to 240°C. Through the meltblown process, the molten polymer is extruded through a mold and thinned by a heating gas stream to form thinner molten fibers and solidify on the collector to form a meltblown nonwoven fiber web.

Benefits of technology

The thermal processing of homopolypolyvinyl alcohol with high hydrolysis is achieved, forming homopolypolyvinyl alcohol fibers with improved tensile strength, barrier properties, water solubility and biodegradability, avoiding the problem of polymer degradation at high temperatures.

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Abstract

A method of making a nonwoven product comprising polyvinyl alcohol fibers, the method comprising the steps of: providing a polyvinyl alcohol composition comprising a homo-polyving akohol having a degree of hydrolysis of 88% to 98% or more and a weight average molecular weight of 14,000 to 22,000; a plasticizer selected from the group consisting of diglycerol, triglycerol, fructose, ribose, xylose, D-mannitol, triacetin, pentaerythritol, dipentaerythritol, methyl pentanediol, 1, 2-propanediol, 1, 4-butanediol, 2-hydroxy-1, 3-propanediol, 3-methyl-1, 3-butanediol, 3, 3-dimethyl-1, 3-butanediol, 1, 3-butanediol, 3, 3-dimethyl-1, 3-butanediol, 3, 3-dimethyl-1, 3-butanediol, 3, 3-dimethyl-1, 3-butanediol, 3, 3-dimethyl-1, 3-butanediol, 3, 3-dimethyl-1, 3-butanediol, 3, 3-dimethyl-1, 3-butanediol, 3, 3-dimethyl-1, 3-butanediol, 3, 3-dimethyl-1, 3-butanediol, 3 the component A is prepared from 1, 2-butanediol, polyethylene glycol 300, polyethylene glycol 400, alkoxylated polyethylene glycol, caprolactam, tricyclic trimethylolpropane methylal, abietate, erucyl amide and a mixture of 1, 2-butanediol, polyethylene glycol 300, polyethylene glycol 400, alkoxylated polyethylene glycol and caprolactam; and an optional stabilizer selected from the group consisting of sodium stearate, potassium oleate, sodium benzoate, calcium stearate, stearic acid, dimethyl pentanediol, propionic acid, and mixtures thereof; melting the composition at a temperature of 200 DEG C to 230 DEG C to form a molten polymer; wherein the molten polymer is melt-blown by: extruding the molten polymer through a die having a spinneret to form molten fibers of the polymer; the fibers are blown out of the mold and thinned by a heated airflow to form thinned molten fibers, the thinned fibers are deposited on a moving collector and solidified to form a meltblown nonwoven web.
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