157 results about "N-Methylmorpholine N-oxide" patented technology

This invention relates to a method of preparing cellulose solution which is homogeneous at relatively low temperature, in which a small amount of cellulose powder or polyvinylalcohol is dissolved in the liquid-state, concentrated N-methylmorpholine-N-oxide (hereinafter, referred to as ‘NMMO’) so as to lower the solidifying temperature of NMMO, and then, the resulting solution and cellulose powder are fed into an extruder so as to be mixed, swollen and melted in the extruder.

This invention pertains to a novel process for preparing fibers from poly(α(1→3) glucan). The fibers prepared according to the invention, have“cotton-like” properties, are useful in textile applications, and can be produced as continuous filaments on a year-round basis. The process comprises solution spinning from a novel solution of poly(α(1→3) glucan) in a mixture of water and N-methylmorpholine-N-oxide followed by coagulation in a liquid coagulant that comprises a liquid that is not water.

It is an object of the present invention to overcome the problem of fibrillation which is a drawback found in solvent-spun regenerated cellulosic fibers and to thereby provide high-quality regenerated cellulosic fibers. The regenerated cellulosic fibers are produced by the use of a spinning dope of cellulose dissolved in a solvent containing N-methylmorpholine N-oxide under the conditions that the average degree of polymerization of cellulose contained in the spinning dope is held to 400 or lower and 5% to 30% by weight of the cellulose is adjusted to a degree of polymerization of 500 or higher. Thus a pseudo-liquid-crystalline phenomenon can be allowed to occur in the stretched filaments during spinning, so that the resulting regenerated cellulosic fibers have improved resistance to fibrillation as well as improved dyeability and feeling.

This application describes a method of preparation of a natural graphene cellulose blended meltblown nonwoven fabric, which comprises using a graphite powder as a raw material for preparing a graphene solution, adding the graphene solution to a slurry formed by mixing and dissolving a wood pulp with N-methylmorpholine N-oxide (NMMO), removing the water content thereof to form a spinning dope, and then directly preparing the natural graphene cellulose blended meltblown nonwoven fabric by a meltblown process. The present method does not require a highly toxic hydrazine hydrate solution. Further, by increasing the adding ratio of the graphene solution in the manufacturing process, control of the antistatic properties and thermal transferring function can be achieved, and thereby various requirements of different consumers can be satisfied. Besides, the fabric can decompose naturally after being used, and thus the product is harmless, natural, and environmentally friendly.

The present invention provides a “spunbond wetlaid method for producing non-woven fabrics from natural cellulose” using pulp as raw material and N-methylmorpholine N-oxide (NMMO) as solvent for dissolving into dope. Then, the dope is extruded out of a spinneret to form filament bundle by spunbond method. The dope is extruded out of a spinneret bank of grouped spinnerets to form filament bundle for further stretching process under quench condition. The filament bundle is coagulated with regeneration in a coagulating solution. The coagulated filament bundle is rapidly stretched under high pressure by an air draw-off machine. The stretched filament bundle is collected and stacked on a collecting net as web nonwoven. After post treatments of water rinsing, hydro-entangled needle punching, drying, winding-up and the like have been orderly applied then final product of nonwoven fabrics with continuous filament are produced from natural cellulose.

The present invention relates to the preparation of a cellulose suspension, particularly of a premixture for the preparation of a cellulose suspension in organic solvents such as an aqueous N-methylmorpholine N-oxide (NMMO) solution.

The invention discloses a graphene tencel composite fiber and a preparation method thereof. The graphene tencel composite fiber is prepared by mixing a graphene oxide solution and cellulose pulp into NMMO (N-methylmorpholine-N oxide) and water, dissolving, filtering, spinning by virtue of a dry-wet spinning process and then finishing by virtue of silk yarns and a graphene oxide finishing solution. The tencel composite fiber contains graphene and is prepared by the following steps: preparing a spinning solution, spinning, and finishing the yarns by virtue of graphene. The obtained yarns can sufficient integrate the excellent characteristics of tencel and graphene, has excellent physical properties of the tencel, such as moisture absorption performance, dyeing performance, comfort, high strength and the like, also improves the flexibility, conductivity, and bacteria resistance of the grpahene, and are ideal fibers for clothes. The preparation process and a production process are pollution-free to the environment, the fiber product waste can be naturally degraded, damage to the environment can be avoided, and a recyclable resource is easy to form.

This application describes a method of preparation of a natural graphene cellulose blended spunbond nonwoven fabric, which comprises using a graphite powder as a raw material for preparing a graphene solution, adding the graphene solution to a slurry formed by mixing and dissolving a wood pulp with N-methylmorpholine N-oxide (NMMO), removing the water content thereof to form a spinning dope, and then directly preparing the natural graphene cellulose blended spunbond nonwoven fabric by a spunbond process. The present method does not require a highly toxic hydrazine hydrate solution. Further, by increasing the adding ratio of the graphene solution in the manufacturing process, control of the antistatic properties and thermal transferring function can be achieved, and thereby various requirements of different consumers can be satisfied. Besides, the fabric can decompose naturally after being used, and thus the product is harmless, natural, and environmentally friendly.

The invention concerns a Lyocell fiber, containing a material selected from the group consisting of pearl powder, ground nacre and mixtures thereof. For the manufacture of the fiber according to the invention, a process is used comprising the steps of

• • manufacturing a spinning solution of cellulose in an aqueous tertiary amine oxide, preferably N-methylmorpholine-N-oxide (NMMO)
  • spinning the spinning solution to fibers,
  • and being characterized in that a material selected from the group consisting of pearl powder, ground nacre and mixtures thereof is admixed to the spinning solution and/or to a precursor thereof.

A stapled melt spinning method for producing nonwoven fabrics with hygroscopic metastatic feature. Firstly, fuse bio-polyamide 6,10 into melt, extrude and spin it out spin heads of extruder into filaments, cool, draw and collect filaments into tow, then extend, cut and card the filaments into the staples, and spread the staples on a conveyer to form fibrous web. Next, blend and dissolve pulp by N-methylmorpholine N-oxide (NMMO) dissolving solvent, dehydrate it to form dope, and extrude and spin it out spin heads of extruder into filaments, then cool, draw and collect filaments into tow, and extend, cut and card filaments into staples, then overlay the staples over existing fibrous web to form a composite fibrous web of bio-polyamide 6,10 and cellulose filaments. Finally, coagulate, regenerate and convert fibrous composite of bio-polyamide 6,10 and natural cellulose into nonwoven fabric with hygroscopic metastatic feature by hydro-entangled needle punching, drying, winding-up processes.

A fabrication of natural cellulose fiber with flame-retarding capability comprises following steps. Blend pulp and solvent of N-methylmorpholine N-oxide (NMMO) to form slurry. Evaporate extra water content from slurry by a Thin Film Evaporator (TFE) to form dope. By Dry-Jet Wet Spinning, spin and extrude dope for coagulating and regenerating. Water-rinse and dry to form natural cellulose fiber. Soaking roll natural cellulose fiber by flame retardant of N-(hydroxymethyl)-3-(methoxy phosphorus acyl). Orderly dry, bake, neutralize, soaping clean, water rinse, baking dry, soaking rolled, alkaline clean, water rinse, dry and oil the natural cellulose fiber to produce natural cellulose fiber of flame retarding capacity. Because of cross-linking reaction for the flame retardant of N-(hydroxymethyl)-3-(methoxy phosphorus acyl) with natural cellulose fiber, the flame-retarding capability thereof meet requirements of testing standards in American ASTM D6413-1999 and ASTM D2863-1995. Moreover, the wastes thereof meet the requirements of environment protections without harm.

A method of recovering an aqueous N-methylmorpholine-N-oxide (NMMO) solution used in production of Lyocell fiber includes: decoloring the aqueous NMMO solution by mixing the same with activated carbon using an agitation blower and by alternately energizing and de-energizing the agitation blower to contact the activated carbon with the aqueous NMMO solution thoroughly in an energy-efficient manner; filtering the aqueous NMMO solution which has been decolored through coarse filtration followed by ultrafiltration to remove the activated carbon and impurities from the aqueous NMMO solution; and concentrating the aqueous NMMO solution which has been filtered using one of a mechanical vapor recompression evaporator and a triple effect evaporator to remove water from the aqueous NMMO solution.

The invention provides a preparation method of an antibacterial cellulose flat nanofiltration membrane. An N-methylmorpholine-N-oxide solvent with moisture content of 10%-16%, propyl gallate, a nanometer SiO2 pore-foaming agent, a nanometer TiO2 antibacterial agent (or a nanometer silver antibacterial agent) and cellulose pulp serve as raw materials, and a homogenous and transparent cellulose membrane casting solution is prepared; sequentially an antibacterial porous cellulose membrane is prepared by means of the immersion gel method; afterwards a poly piperazine aqueous solution and an N-hexane organic solution containing trimesoyl chloride are prepared, operation is conducted to make a crosslinking product obtained by polymerization of poly piperazine and trimesoyl chloride uniformly attached to membrane holes and membrane surfaces, and finally the antibacterial cellulose flat nanofiltration membrane is obtained. The whole preparation process is simple, cost is low, the prepared antibacterial cellulose flat nanofiltration membrane can be used for removing multivalent ions, a part of salts with monovalent ions and organics with molecular weight larger than 300, and has the advantages of being high in retention and water flux, selective in adsorption and friendly to the environment.

The present invention provides a fabricating method for natural cellulose fiber blended with nano silver.

The fabricating method comprises following steps:

• • Firstly, prepare nano silver colloidal sol by reduction titration for mixture of polyvinyl alcohol (PVA), silver nitrate (AgNO₃) and sodium borohydride (NaBH₄).
  • Secondly, prepare mixing cellulose serum by blending agitation for mixture of wood pulp, N-methylmorpholine N-oxide (NMMO) and stabilizer.
  • Thirdly, produce spinning dope by blending and dehydrating the nano silver colloidal sol and mixing cellulose serum.
  • Fourthly, produce fibrous tow by Dry-Jet Wet Spinning method in association with coagulation, regeneration in coagulation bath, and water rinse.
  • Finally, obtain final product of natural cellulose fiber blended with nano silver by post treatments of dry, oil and coil in proper order.

An object of the present invention is to provide a polyrotaxane-containing solution by finding a good solvent for polyrotaxanes, and more particularly, to provide a polyrotaxane-containing solution by finding a good solvent for polyrotaxanes with a cyclodextrin as the cyclic molecule(s).

The present invention provides a polyrotaxane-containing solution comprising polyrotaxane dissolved in a solvent selected from the group consisting of a nitrogen-containing organic solvent and an ionic liquid. In particular, a nitrogen-containing organic solvent such as N-methylmorpholine-N-oxide or hydrate thereof; a solution of a nitrogen-containing organic solvent such as N,N-dimethylacetamide containing as solute an alkali metal halide or alkaline earth metal halide such as lithium chloride; or an ionic liquid such as an N,N′-dialkylimidazolium salt or N-alkylpyridinium salt, is a good solvent for polyrotaxanes.

The present invention provides a fabricating method for spunbond nonwoven from natural cellulose fiber blended with nano silver, which comprises following steps.

Firstly, prepare nano silver colloidal sol by reduction titration for mixture of polyvinyl alcohol (PVA), silver nitrate (AgNO₃) and sodium borohydride (NaBH₄).

Secondly, prepare mixing cellulose serum by blending agitation for mixture of wood pulp, N-methylmorpholine N-oxide (NMMO) and stabilizer.

Thirdly, prepare blending mucilage from mixing cellulose serum via blending process.

Fourthly, produce spinning dope by blending and dehydrating the nano silver colloidal sol and mixing cellulose serum.

Fifthly, produce molten filament tow by spunbond spinning method in association with coagulation, regeneration, water rinse and high-speed stretching process.

Finally, by post treatments of hydro-entangled needle punching, drying, winding-up processes in proper order, obtain final product of spunbond nonwoven from natural cellulose fiber blended with nano silver, which is biodegradable with features of antibacterial and antistatic capabilities.

The invention relates to a method of preparing Lyocell by taking bamboos as a raw material. The method comprises the following steps: by taking bamboos as the raw material, extracting cellulose from the bamboos by means of process methods such as degumming, lignin removal, and hemicelluloses removal and the like, and then dissolving bamboo cellulose in an N-methylmorpholine-N-oxide aqueous solution to prepare a spinning solution; feeding the spinning solution into a spinning system, vertically stretching sprayed silk yarns in air, and feeding the silk yarns to a condensing bath to be condensedto fibers; and preparing the Lyocell from the fibers through the processes such as alcohol washing, bleaching, washing, oiling and drying. The dry breaking strength of the Lyocell prepared by the method is between 44 cN/tex and 47 cN/tex, the dry elongation at break thereof is between 13% and 15%, the wet breaking strength thereof is between 29 cN/tex and 32 cN/tex, the wet elongation at break thereof is between 15% and 17%, and the strong performance thereof is close to that of purchased Lyocell.

A Meltblown process for producing non-woven fabrics with flame-retarding capability from natural cellulose comprises following steps. Blend pulp and solvent of N-methylmorpholine N-oxide (NMMO) to form slurry. Evaporate water content from slurry by a Thin Film Evaporator to form dope. Extrude the dope off spinneret bank to form filament bundle via meltblown process. Coagulating regenerate, water rinse, hydro-entangled needle-punch and dry the filament bundle to form normal natural cellulose nonwoven. Soaking roll formed nonwoven by flame retardant of N-(hydroxymethyl)-3-(methoxy phosphorus acyl). Orderly dry, bake, neutralize, soaping clean, water rinse, baking dry, soaking roll, alkaline clean, water rinse, dry and coil the nonwoven to produce modified natural cellulose nonwoven of flame retarding capacity. Because of cross-linking reaction between foregoing flame retardant and natural cellulose nonwoven, the flame-retarding capability thereof meet requirements of testing standards in American ASTM D6413-1999 and ASTM D2863-1995. Moreover, the wastes thereof meet environmental protection requirements.

The present invention discloses a nanometer microcrystalline cellulose preparation method, which comprises: (1) adopting N-methylmorpholine-N-oxide and an ion liquid to treat microcrystalline cellulose; and (2) recovering the treatment agent. According to the present invention, the nanometer microcrystalline cellulose preparation method has the following advantages that: microcrystalline cellulose is adopted as a raw material, and can be extracted from plants, such that the source is wide, and the natural plant fiber utilization rate is substantially increased; the N-methylmorpholine-N-oxide and the ion liquid are subjected to coupling use, and the treatment is performed to obtain the fragmented nanometer microcrystalline cellulose; the N-methylmorpholine-N-oxide and the ion liquid can be recycled after being treated so as to reduce the nanometer microcrystalline cellulose production cost; and the nanometer microcrystalline cellulose preparation process has characteristics of simpleness, easy performing and green environmental protection, and no corrosion on equipment, environmental pollution and other problems exists.