CN113337916B - Reactive dye easy-dyeing spandex and preparation method thereof - Google Patents
Reactive dye easy-dyeing spandex and preparation method thereof Download PDFInfo
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- CN113337916B CN113337916B CN202110724023.7A CN202110724023A CN113337916B CN 113337916 B CN113337916 B CN 113337916B CN 202110724023 A CN202110724023 A CN 202110724023A CN 113337916 B CN113337916 B CN 113337916B
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/88—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds
- D01F6/94—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds of other polycondensation products
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
- C08G18/12—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step using two or more compounds having active hydrogen in the first polymerisation step
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4804—Two or more polyethers of different physical or chemical nature
- C08G18/482—Mixtures of polyethers containing at least one polyether containing nitrogen
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4854—Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/50—Polyethers having heteroatoms other than oxygen
- C08G18/5021—Polyethers having heteroatoms other than oxygen having nitrogen
- C08G18/5024—Polyethers having heteroatoms other than oxygen having nitrogen containing primary and/or secondary amino groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
- C08G18/6666—Compounds of group C08G18/48 or C08G18/52
- C08G18/667—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
- C08G18/6681—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/32 or C08G18/3271 and/or polyamines of C08G18/38
- C08G18/6685—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/32 or C08G18/3271 and/or polyamines of C08G18/38 with compounds of group C08G18/3225 or polyamines of C08G18/38
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/38—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using reactive dyes
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P3/00—Special processes of dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form, classified according to the material treated
- D06P3/82—Textiles which contain different kinds of fibres
- D06P3/8204—Textiles which contain different kinds of fibres fibres of different chemical nature
- D06P3/8219—Textiles which contain different kinds of fibres fibres of different chemical nature mixtures of fibres containing hydroxyl and amide groups
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- General Chemical & Material Sciences (AREA)
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Abstract
A reactive dye easy-dyeing spandex and a preparation method thereof are characterized in that a dihydroxy polymer in a soft segment of the spandex is composed of a conventional dihydroxy polymer and a dihydroxy polymer containing a tertiary amine group, wherein the dihydroxy polymer containing the tertiary amine group accounts for 5-20 mol% of the total amount of the dihydroxy polymer in the soft segment, and the addition number of a polymerization monomer in a main chain ranges from 15 to 60; adding organic compound of lithium into the spandex spinning auxiliary. The dihydroxyl polymer containing the tertiary amine group in the spandex molecular chain and the organic compound of the lithium dispersed in the dihydroxyl polymer can form covalent bond combination with the active group of the reactive dye, so that the connection between the reactive dye molecules and the spandex molecular chain is firmer, and the dye uptake of the reactive dye to spandex is effectively improved. The spandex of the invention can be mixed with cotton, cellulose fiber or protein fiber in a bare silk form or used as a core material of core spun yarn, and the color difference between the spandex and the compatible yarn can be effectively reduced by adopting reactive dye dyeing.
Description
Technical Field
The invention relates to reactive dye easy-dyeing spandex, a preparation method and application thereof.
Background
Spandex fibers generally refer to block copolymers containing repeating urethane-based segments in the backbone. The spandex fiber can be blended and interwoven with cellulose fiber, polyester fiber, polyamide fiber, acrylic fiber and the like to be used in garment materials such as underwear, socks, swimsuits, sportswear and the like, and provides the fabric with excellent elasticity and resilience.
In the using process of the spandex covered yarn, the core yarn is exposed due to factors such as sliding elasticity, processing technology defects and the like, and the appearance quality of the fabric is affected if the colors of the exposed core yarn and the exposed covering yarn are not consistent, so that the dyeing of the core yarn needs to select a dye and a dyeing process which are similar to those of the covering yarn, and the color difference of the fabric is reduced. According to the dyeing properties of the compatible fiber and the spandex fiber, the polyamide/spandex fabric is generally dyed by weak acid dye, the polyester/spandex fabric is generally dyed by disperse dye, and the cellulose fiber/spandex fabric is generally dyed by reactive dye.
The reactive dye is also called reactive dye, is a water-soluble dye, has the characteristics of bright color, good level dyeing property, simple and convenient dyeing method, high dyeing fastness, complete chromatogram, lower cost and the like, and is mainly applied to dyeing and printing of fibers such as cotton, hemp, viscose, silk, wool and the like and blended fabrics thereof. Reactive dyes are generally composed of four moieties, a water-soluble group, a dye precursor, a linking group and a reactive group, wherein the reactive group is capable of reacting with hydroxyl groups in cellulose and amino groups in protein fibers to form covalent bonds with the fibers during dyeing to form "dye-fiber" compounds. And the common spandex molecular structure does not have a molecular group which can be combined with the reactive dye, so that the reactive dye is limited in the dyeing application field of spandex-containing fabrics.
The existing preparation method of reactive dye easy-dyeing spandex has less reports in the existing patents, and basically, a dyeable component additive is added to improve the dyeing effect. For example, chinese patent document CN105442083A adopts polyurethane urea solution to add modification auxiliary agent, and performs quaternary amination modification on spandex fiber to improve dye uptake, but only performs ionic bond combination with water-soluble group of reactive dye, and the dyeing effect is improved to a limited extent; chinese patent document CN108138388A adopts alkaline earth metal salt additive added in the stock solution, which can form covalent bond with reactive dye to improve the dye uptake, and does not change the molecular structure of spandex. The methods provided by the above patent documents have limited improvement degree of dye uptake, and the reactive groups of the reactive dyes and fiber molecules do not form a co-firm covalent bond, so that the dyes are easy to fall off after washing or rubbing.
Compared with the prior art, the reactive dye easy-dyeing spandex and the preparation technology thereof improve the covalent bond bonding capability of the molecular group of the spandex fiber and the reactive dye, and simultaneously, the organic compound auxiliary agent of lithium is added into the fiber, so that the dye uptake and the color fixation rate of the reactive dye are greatly enhanced.
Disclosure of Invention
The invention aims to provide spandex easy to dye by using reactive dyes, and also aims to provide a preparation method of the spandex easy to dye by using the reactive dyes.
In order to achieve the purpose, the scheme provided by the invention is as follows:
a reactive dye-dyeable spandex, characterized in that the dihydroxy polymer in the soft segment of the spandex is composed of a conventional dihydroxy polymer and a dihydroxy polymer containing tertiary amine groups, wherein the dihydroxy polymer containing tertiary amine groups accounts for 5mol% to 20mol% of the total amount of dihydroxy polymer in the soft segment.
The conventional dihydroxy polymer spun with spandex is generally selected from aliphatic polyesters or polyethers having a relative molecular mass of 800-3000 (preferably 1500-2500, more preferably 1800-2000) and hydroxyl groups at both molecular terminal groups, including but not limited to polyethylene glycol adipate, polytetramethylene ether glycol, etc., and the dihydroxy polymer containing tertiary amine groups refers to a dihydroxy polymer containing nucleophilic tertiary amine groups in its molecular chain. The tertiary amine group in the dihydroxyl polymer containing the tertiary amine group can form a firm covalent bond with the active group in the reactive dye, and the reactive dye molecules are fixed on the soft section of the spandex fiber, so that the dyeability of the reactive dye on the spandex fiber can be effectively improved. However, when the content of the dihydroxy polymer containing a tertiary amine group is too high, the physical properties of the resulting spandex fiber are adversely affected, and when the content is too low, the number of the tertiary amine groups in the molecular chain of the spandex fiber is small, and the dyeing property is poor, so that the amount thereof should be controlled, and it is preferable that the dihydroxy polymer containing a tertiary amine group is 5 to 20mol% based on the total amount of the dihydroxy polymer in the soft segment.
Preferably, the number of polymer monomers in the main chain of the dihydroxy polymer containing a tertiary amine group is 15 to 60. The molecular weight of the dihydroxyl polymer containing the tertiary amine group with the polymer monomer number of 15-60 is closer to that of the conventional dihydroxyl polymer, and the influence on the performance of the prepared spandex fiber can be reduced.
Preferably, the dihydroxy polymer containing a tertiary amine group is a fatty amine polyoxyethylene ether.
More preferably, the fatty amine polyoxyethylene ether is one or a mixture of several of laurylamine polyoxyethylene ether, hexadecylamine polyoxyethylene ether and octadecylamine polyoxyethylene ether.
Preferably, the spandex is added with an organic compound of lithium.
The organic compound of lithium with nucleophilicity can be combined with the reactive dye to form a covalent bond, so that the organic compound of dispersing and adding lithium in spandex can enhance the combination performance of the spandex fiber and the reactive group of the reactive dye and increase the dyeing property of the reactive dye.
A preparation method of reactive dye easy-dyeing spandex is characterized by comprising the following steps:
1) Mixing a conventional dihydroxy polymer and a dihydroxy polymer containing tertiary amine groups in a prepolymerization stage, wherein the dihydroxy polymer containing tertiary amine groups comprises 5 to 20mol% of the total amount of the dihydroxy polymer mixed;
2) Mixing the mixed dihydroxy polymer obtained in the step 1) with diisocyanate to react to obtain a polyurethane prepolymer terminated by an isocyanate group containing a tertiary amine group;
3) Dissolving the prepolymer in the step 1) in an organic solvent to prepare a prepolymer solution with a certain concentration;
4) After the prepolymer solution is cooled, carrying out chain extension reaction and chain termination reaction to prepare a polyurethane urea solution;
5) After the prepared spandex spinning solution is cured for a certain time, adding an auxiliary agent, uniformly mixing, and then spinning by a dry method to prepare spandex fibers.
Wherein, the chain extender of the chain extension reaction can be dihydric alcohol, such as 1, 4-butanediol, ethylene glycol, diethylene glycol and the like; the chain extender may also be a diamine such as ethylenediamine, propylenediamine, and the like. The chain terminator used in the chain termination reaction may be one or a mixture of diethylamine, dimethylamine, diisopropylamine, butylmethylamine, dibutylamine, etc.
Preferably, the adjuvant comprises organic compounds of lithium in an amount of 1% -5% by weight of the spandex dope.
In particular, the lithium organic compound must be added after aging, otherwise the viscosity and quality of the spinning dope are affected.
Preferably, the organic compound of lithium is butyl lithium, phenyl lithium, or the like.
Preferably, adding uniformly ground additives into the polyurethane urea solution prepared in the step (4), and fully and uniformly stirring to prepare a spandex spinning solution;
preferably, the additive is one or a mixture of several of an anti-ultraviolet agent, an antioxidant, a lubricant, a delustering agent and the like, and is fully ground and uniformly dispersed.
Preferably, the dihydroxy polymer containing a tertiary amine group is a fatty amine polyoxyethylene ether.
Preferably, the fatty amine polyoxyethylene ether is one or a mixture of more of lauryl amine polyoxyethylene ether, hexadecyl amine polyoxyethylene ether and octadecyl amine polyoxyethylene ether.
A dyeing method of spandex easy to dye by reactive dye is characterized by comprising the following steps:
a first step, a dyeing stage: pre-blending a dye solution with reactive dye, electrolyte, cosolvent and the like, adjusting the pH value of the dye solution to 4-5, dyeing the reactive dye easy-dyeing spandex or fabric or yarn containing the reactive dye easy-dyeing spandex or the fabric or yarn containing the reactive dye easy-dyeing spandex, and preserving heat;
the reactive dye contains water-soluble groups, is dissolved in water and ionized into dye anions, the acid bath is favorable for spandex fiber tertiary amine groups to adsorb protons and carry positive charges, and the dye anions can be combined with tertiary amine group positive ions through ionic bonds, so that dye molecules can be fully gathered in the surface inner layer of the spandex fiber.
Step two, a color fixing stage: adding alkaline color fixing agents such as sodium carbonate and sodium bicarbonate into the dye liquor, adjusting the pH value to 10-11, and preserving the temperature;
the alkaline bath is favorable for the nucleophilic reaction between the hydroxyl group in the cellulose fiber, the amino group in the protein fiber and other groups and the reactive group of the reactive dye to form covalent bond. In the first step, dye molecules are fully gathered around the spandex fiber, and the alkaline bath is more favorable for the dye molecules to perform full nucleophilic reaction with the tertiary amine group of the spandex fiber, so that the dye uptake of the dye is improved.
And thirdly, neutralizing the dye liquor, adjusting the pH to be close to neutrality, fully washing with water, and removing unfixed dye, salt and alkali.
Preferably, the fiber compatible with the reactive dye easy-dyeing spandex is one or more of cotton fiber, hemp, viscose fiber, lyocell fiber, cuprammonium fiber, bamboo fiber, acetate fiber, silk and wool.
Has the beneficial effects that:
compared with the prior art, the reactive dye easy-dyeing spandex introduces a nucleophilic tertiary amine structure into the soft segment of spandex molecules, and can form covalent bond combination with the reactive groups of the reactive dye, so that the reactive dye molecules and spandex molecular chains are connected more firmly, the dyeing property of the reactive dye on the spandex is effectively improved, and the limit on the using amount and the monomer amount of the dihydroxy polymer containing the tertiary amine groups can improve the dyeing property of the reactive dye of the prepared spandex fiber and ensure the performance of the spandex fiber; the organic compound additive of lithium with nucleophilicity is added, so that the binding capacity of the reactive dye and the spandex fiber is greatly enhanced, and the coloring performance of the reactive dye on the spandex fiber is improved; the mixed fabric of spandex and other fibers prepared by using the spandex fiber provided by the invention can be dyed by reactive dye at one time, is simple and convenient to operate and uniform in coloring, and avoids the phenomenon of inconsistent dyeing of the mixed fabric.
Examples
[ example 1 ] A method for producing a polycarbonate
160kg of a sufficient mixture of polytetrahydrofuran ether glycol PTMEG with the number average molecular weight of 2000 and dodecylamine polyoxyethylene ether with the vinyl ether monomer number of 40 is taken, wherein the dodecylamine polyoxyethylene ether accounts for 10mol percent of the total amount of the mixture, and the mixture reacts with 32kg of 4,4' -diphenylmethane diisocyanate at the temperature of 90 ℃ for 1h to prepare the prepolymer with the end group of isocyanate.
The prepolymer solution was added to 300kg of N, N-dimethylacetamide solvent, sufficiently stirred and dissolved uniformly. After cooling the prepolymer, a chain extending amine solution and a terminating amine solution were added, wherein the chain extending amine was 8kg of ethylenediamine and the terminating amine was 0.8kg of dipropylamine, and the solutions were prepared in N, N-dimethylacetamide at concentrations of 7% and 2%, respectively.
After the chain extension termination reaction, the well-mixed and ground additives including 0.5kg of TDO,0.5kg of 150HN,0.3kg of MGST, and 3kg of DHT800 were added. And (3) fully and uniformly mixing to obtain the polyurethane spinning solution. After curing for a certain time, 3kg of butyl lithium is added, and after being fully and uniformly mixed, the 40D reactive dye easy-dyeing spandex fiber is obtained through dry spinning.
[ example 2 ]
The reactive dye-dyeable spandex fiber obtained in example 1 and a cotton fiber were mixed and knitted into a fabric, and the fabric was dyed with a reactive dye. The staining procedure was as follows:
firstly, pre-blending reactive dye, electrolyte, cosolvent and the like into dye liquor, adjusting the pH of the dye liquor to 4-5, dyeing the fabric, and keeping the temperature;
secondly, adding sodium carbonate into the dye liquor as an alkaline color fixing agent, adjusting the pH value to 11, and preserving the temperature;
and thirdly, adjusting the pH value to be neutral, and fully washing the fabric.
The preparation and dyeing technology of the reactive dye easy-to-dye spandex provided by the invention improves the dyeing property of the reactive dye of the spandex fiber on the basis of not changing the performance of the spandex fiber, and effectively reduces the color difference between the spandex fiber and compatible yarns of spandex-containing fabric.
Claims (8)
1. The reactive dye easy-dyeing spandex is characterized in that a dihydroxy polymer in a soft segment of the spandex consists of a conventional dihydroxy polymer and a dihydroxy polymer containing a tertiary amine group, wherein the dihydroxy polymer containing the tertiary amine group accounts for 5-20 mol% of the total amount of the dihydroxy polymer in the soft segment, and the dihydroxy polymer containing the tertiary amine group is fatty amine polyoxyethylene ether;
the reactive dye easy-dyeing spandex is prepared by the following steps:
1) Mixing a conventional dihydroxy polymer and a dihydroxy polymer containing a tertiary amine group in a prepolymerization stage, wherein the dihydroxy polymer containing a tertiary amine group accounts for 5 to 20mol% of the total amount of the dihydroxy polymer mixed;
2) Mixing the mixed dihydroxy polymer obtained in the step 1) with diisocyanate to react to obtain a polyurethane prepolymer terminated by an isocyanate group containing a tertiary amine group;
3) Dissolving the prepolymer obtained in the step 2) in an organic solvent to prepare a prepolymer solution with a certain concentration;
4) After the prepolymer solution is cooled, carrying out chain extension reaction and chain termination reaction to prepare a polyurethane urea solution;
5) The prepared polyurethane urea solution is used as a polyurethane fiber spinning solution, after being cured for a certain time, an auxiliary agent is added, the mixture is uniformly mixed, and then the polyurethane fiber is prepared through dry spinning.
2. The reactive dye-dyeable spandex of claim 1, wherein the number of adducted polymerized monomers in the backbone of the dihydroxy polymer containing tertiary amine groups is in the range of 15 to 60.
3. The reactive dye-sensitized spandex according to claim 1, characterized in that said auxiliaries comprise organic compounds of lithium.
4. A preparation method of spandex which is easy to dye by reactive dye is characterized by comprising the following steps:
1) In the prepolymerization stage, mixing a conventional dihydroxy polymer and a dihydroxy polymer containing a tertiary amine group, wherein the dihydroxy polymer containing the tertiary amine group accounts for 5-20 mol% of the total amount of the mixed dihydroxy polymer, and the dihydroxy polymer containing the tertiary amine group is fatty amine polyoxyethylene ether;
2) Mixing the mixed dihydroxy polymer obtained in the step 1) with diisocyanate for reaction to obtain a polyurethane prepolymer terminated by an isocyanate group containing a tertiary amine group;
3) Dissolving the prepolymer obtained in the step 2) in an organic solvent to prepare a prepolymer solution with a certain concentration;
4) After the prepolymer solution is cooled, carrying out chain extension reaction and chain termination reaction to prepare a polyurethane urea solution;
5) The prepared polyurethane urea solution is used as a polyurethane fiber spinning solution, is aged, added with an auxiliary agent, uniformly mixed and then spun by a dry method to prepare polyurethane fiber.
5. The method for preparing spandex with an easily dyeable tertiary amine group as claimed in claim 4, wherein the number of polymer monomers in the main chain of the dihydroxy polymer containing a tertiary amine group is 15 to 60.
6. The method for preparing spandex with a reactive dye easy to dye according to claim 4, wherein the auxiliaries comprise organic compounds of lithium.
7. A dyeing method of spandex easy to dye by reactive dye is characterized by comprising the following steps:
a) And (3) a dyeing stage: pre-blending a reactive dye, an electrolyte and a cosolvent into a dye solution, adjusting the pH of the dye solution to 4-5, dyeing spandex or fabric or yarn containing the spandex which is easy to be dyed by using the reactive dye as claimed in any one of claims 1 to 3, and preserving heat;
b) And (3) a color fixing stage: adding an alkaline color fixing agent into the dye liquor, adjusting the pH value to 10-11, and keeping the temperature;
c) Neutralizing the dye liquor, adjusting the pH value to be neutral, and fully washing with water.
8. The method for dyeing spandex easy to dye with reactive dye according to claim 7, wherein the fiber compatible with the spandex easy to dye with reactive dye is one or more of cotton fiber, hemp, viscose fiber, lyocell fiber, cuprammonium fiber, bamboo fiber, acetate fiber, silk and wool.
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