34results about "Monocomponent polyureas artificial filament" patented technology

This invention provides a fiber comprising a polyurethaneurea and layers delaminated from a lamellar clay, said layers being dispersed in said polyurethaneurea.

The invention relates to a production method of polyurethane urea elastic fiber with high heat setting efficiency. The method comprises the steps of: reacting with polytetramethylene ether glycol, 4,4'diphenylmethane diisocyanate and isophorone diisocyanate in solvent to obtain isocyanate-terminated prepolymer; adding monamine compound and bis(secondary amine) compound mixed amine organic amide solution into the prepolymer for performing first chain extension, and then adding monamine compound and bis(primary amine) compound mixed amine organic amide solution for performing second chain extension to obtain polyurethane urea solution, and finally adding properly organic amide solution with low-volatile diamine and/or triamine compound into the stock solution; finally, adding 4,4'diphenylmethane urea derivatives into the generated stock solution with excessive amine; agitating the polyurethane urea stock solution at low speed and curing, then performing dry-process spinning to obtain polyurethane urea elastic fiber. According to the production method, the requirement on the setting efficiency of the polyurethane urea elastic fiber in the special fields can be met.

The invention provides polyurethaneurea compositions comprising poly(tetramethylene-co-ethyleneether) glycol having high number average molecular weight, from about 1900 to about 4000 Dalton. The invention further relates to the use of high number average molecular weight poly(tetramethylene-co-ethyleneether) glycol as the soft segment base material in spandex compositions. The invention also relates to new polyurethane compositions comprising poly(tetramethylene-co-ethyleneether) glycols with such high number average molecular weight, from about 1900 to about 4000 Dalton, and their use in spandex.

The invention discloses carbon dioxide based polyurea and a preparation method and application thereof, belongs to the technical field of macromolecular materials, and solves the technical problem in the prior art that the molecular weight of the carbon dioxide based polyurea prepared by the preparation method of the carbon dioxide based polyurea is low, so that the carbon dioxide based polyurea cannot be further applied. The method comprises the following steps: adding a prepolymer or a sliced prepolymer in a reaction device, then continuously blowing carbon dioxide into the reaction device, and completely reacting amino in the prepolymer so as to generate the carbon dioxide based polyurea, wherein the reaction temperature is 120-400 DEG C, the reaction pressure is 0.1-20 MPa, and the reaction time is 0.5-50h. The carbon dioxide which is continuously blown in the method not only can take away a by-product, water, which is not eliminated in the polymerization of the carbon dioxide under a high pressure but also can be inserted into a reaction system, the average molecular weight of the prepared polyurea is between 5000-50000, and the properties are excellent.

The invention discloses a method of preparing elastic spandex fibers for paper diapers. The method comprises the following steps that (1) polyether diol and diisocyanate are mixed and react to produce prepolymers; (2) the prepolymers are dissolved through dimethylacetamide, then mixed amine is added for chain growth reaction, and segmented copolymer solution is formed; (3) polymer dope is made by mixing, balancing and filtering the segmented copolymer solution; (4) under the continuous action of a certain amount of pressure, the polymer dope is uniformly and quantitatively pressed in a spinning head through a metering pump, and then is squeezed out of pores in a spinneret plate to form a filament trickle, and the filament trickle enters a passageway filled with hot air; (5) the dimethylacetamide in the filament trickle is removed in a volatilization mode, therefore, the concentration of the filament trickle is increased continuously until the filament trickle is solidified, and meanwhile a winding roller operates to enable the filament trickle to be pulled to be thinned and form spandex filaments; (6) the spandex filaments are wound to form elastic spandex fiber products.

There is disclosed a polyurethaneurea resin consisting of a polymer represented by the following chemical formula (I): [A-O-(O)C-NH-D-NH-C(O)-NH-D-NH-C(O)-O]n wherein A represents an organopolyol residue having a number average molecular weight of approximately 500 to 5,000 and a weight average molecular weight/number average molecular weight (MW/MN) of 1.5 to 2.5 with the number of functional groups ranging from 1.8 to 2.2, D represents an aromatic organodiisocyanate residue ranging, in the number of functional groups, from 1.8 to 2.2, and n represents the number of repeat units. This resin is superior in thermal resistance and elastic recovery, so that it is suitable to melt spinning to make useful elastic fibers.

The invention relates to polyethers containing urethane or urea groups as compatibilising agents, their preparation and use, obtained by the reaction of A. at least one di- and/or polyisocyanate with B. (a) at least one hydrophilic polyether which randomly carries at least one OH and/or NH2 and/or NH function and (b) at least one hydrophobic polyether which randomly comprises at least one OH and/or NH2 and/or NH function and (c) optionally further compounds which carry at least one OH and/or NH2 and/or NH function and/or other isocyanate-reactive groups such as carboxylic acid or epoxide functions, and with the proviso that at least one isocyanate A is difunctional or multifunctional.

This invention relates to a polyurethaneurea elastic fiber of which the weatherability is excellent and the preparing method thereof. The invention prepares the polyurethaneurea elastic fiber by adding the formamidine type ultraviolet absorber of formula I to the spinning dope and the strength maintenance rate of the polyurethaneurea elastic fiber is over 90 % after being left for 24 hours at the Fade-O-Meter in which the sunshine carbon arc is installed, wherein, R1 and R2 represent an each alkyl group of 1 to 5 carbon atoms.

An elastic fiber is provided that includes polyurethane and/or polyurethaneurea and an additive such as polystyrene, an acrylic polymer, polyvinylpyrrolidone, copolymers thereof, derivatives thereof, and combinations thereof. The elastic fiber is useful in laminate structures, such as disposable hygiene articles as wells as in knit, woven and nonwoven fabric constructions.

The present invention relates to polyurethane-urea elastomeric fiber with low-temperature workability, and more specifically to polyurethane-urea elastomeric fiber prepared by forming a prepolymer by means of a primary polymerization of polyol and diisocyanate, and then a secondary polymerization of the prepolymer, a first chain extender, and a second chain extender, wherein the first chain extender is one or more types selected from among aromatic, aliphatic and alicyclic amines, and the second chain extender is one or more types selected from among aromatic, aliphatic and low molecular-weight diols. The polyurethane-urea elastomeric fiber according to the present invention has improved fiber uniformity and workability and enhanced heat-set efficiency, thus allowing heat-setting to be carried out at a low temperature to keep thermal embrittlement from occurring to the fiber under treatment, and therefore the touch of the fabric can be improved and the edge-curling of the processed fabric can be prevented.

The present invention relates to a preparation method of polyurethaneurea elastic fiber, particularly a preparation method of high heat-resistant elastic fiber which retains unique physical properties of elastic fiber under the high temperature process. The polyurethaneurea elastic fiber of the present invention is characteristically prepared without using 1 functional mono-alcohol generally used to regulate the reaction speed and side-reaction during the prepolymer reaction to produce elastic fiber having excellent heat-resistance particularly for the dyeing processing or re-dyeing of polyester but using ethylenediamine alone as a chain extender for the polymerization. To reduce gel formation in polymer after the secondary polymerization and to regulate change of viscosity in the course of process, the ratio of the chain extender amine to the terminal group of prepolymer of the first polymerization is increased.

A dye composition and a dyeing method for an elastic fabric are provided. The dyeing method includes: (a) providing an elastic fabric which includes an elastic fiber; and (b) immersing the elastic fabric in a dye composition. The dye composition includes an ion modifier and a dye. The elastic fiber of the elastic fabric has a first ion by contacting the ion modifier, and the first ion has a first charge; the dye has a second ion, and the second ion has a second charge opposite to the first charge. The first ion of the elastic fiber and the second ion of the dye together form an ionic bonding.

A problem addressed by the present invention is to provide a resin out of which a heat-resistant non-woven fabric having a fine fiber diameter can be made by an electrospinning method. A main object of the present invention is to provide a resin, including a structure(s) represented by at least one selected from the group consisting of the following general formulae (1) to (3), wherein an end of the main-chain of the resin has at least one selected from alkyl groups having 10 or more carbon atoms and fluoroalkyl groups having 4 or more carbon atoms;

(wherein, in the general formula (1), X independently represents a single bond or —NR³—; R¹ and R² independently represent a C₄-C₃₀ bivalent organic group; R³ represents a hydrogen atom or a C₁-C₁₀ monovalent organic group; in the general formula (2), R⁴ represents a C₄-C₃₀ bivalent organic group; R⁵ represents a C₄-C₃₀ tetravalent organic group; in the general formula (3), R⁶ represents a C₄-C₃₀ bivalent organic group; R⁷ represents a C₄-C₃₀ trivalent organic group; l, m, and n are each an integer of 0 or greater with the proviso that l+m+n=10 or greater; and wherein the structures represented by the general formulae (1) to (3) do not necessarily need to be consecutively present.)