Classifications

• • 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
  • D01F6/78—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolycondensation products
  • D01F6/84—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolycondensation products from copolyesters

Definitions

• the present invention relates to a manufacturing method of polyester fiber having improved light fastness, particularly relates to a method comprising copolymerizing polyester and ester forming monomer having the structure of naphthalene ring into copolyester, subjecting the copolyester component formed to spin-draw process to obtain fiber which has excellent light fastness after dyeing, can prevent from the cracking caused by ultraviolet radiation, is suitable for the automobile interior decoration, curtain and outdoor application, and can keep fresh color without fading even being exposed to sunlight for a long time.
• Polyester has excellent physical property, therefore is widely used in various application such as fiber, membrane, engineering plastic, etc., wherein the fiber can be used in home decoration, automobile interior decoration, industrial fiber, etc, besides garment application.
• the high temperature and the ultraviolet radiation can cause the dyeing molecule in the fiber to decompose and crack, leading to fading.
• the U.S. Pat. No. 4,789,382 disclosed that adding ultraviolet radiation absorbent like benzophenone in the dye bath to improve light fastness.
• the U.S. Pat. No. 4,110,301 disclosed a photo rearrangement compound having the ability of improving light fastness of polyester fiber; wherein the photo rearrangement compound can be added to the dye bath or added during the spinning process.
• the Japan laid open publication No. 1990-41468 disclosed that adding ultraviolet radiation absorbent like benzotriazole in the dye bath to improve light fastness.
• 1992-339885 disclosed that adding ultraviolet radiation absorbent like benzotriazole and benzophenone in the dye bath together to improve light fastness. Furthermore, the Japan laid open publication No. 1987-276018 disclosed that adding three kinds of components such as ultraviolet radiation absorbent like benzotriazole, tetramethyl piperidine compound and aliphatic polyester polyol during the spinning process to improve light fastness. The Japan laid open publication No. 1992-240212 disclosed that adding ultraviolet radiation absorbent like acrylic copolymer comprising 2-hydroxy-4-( methacryloyloxy ethoxy ) benzophenone to improve light fastness. The U.S. Pat. No.
• 4,189,476 disclosed that applying aromatic polyester comprising 10 to 23 mole % of 2,6-dioxy naphthalene to produce melting polyester fiber possessing high elongation and high modulus properties, wherein the using amount of ester forming monomer like 2,6-dioxy naphthalene is high as 10 to 23 mole % and the melting polyester fiber is of high elongation and high modulus.
• ester forming monomer like 2,6-dioxy naphthalene is high as 10 to 23 mole % and the melting polyester fiber is of high elongation and high modulus.
• both ultraviolet radiation absorbent like benzophenone and ultraviolet radiation absorbent like benzotriazole applied in the above described patents are yellow powder, this causes the fiber formed exhibiting light yellow color, therefore leads to the adverse effect of dyeing offset.
• the ultraviolet radiation absorbent added is a small molecule compound, having not bonded with the polymer, therefore it can migrate to the fiber surface during the post processing stage and the application stage, causing pollution; after several times of application and washing, it has a lowered effective composition; or after long time exposure, it shows some adverse results, like lower effectiveness, etc. due to gradual decomposition.
• One object of the invention is to provide a method that can effectively improve light fastness of fiber, that has no problems of lowered effective composition and problems of pollution caused by ultraviolet radiation absorbent migrating to the fiber surface; furthermore, the fiber produced has excellent whiteness and fresh color after dyeing, without dyeing offset caused by ultraviolet radiation absorbent exhibiting yellowish.
• Another object of the invention is to provide a polyester fiber that possesses excellent and permanent light fastness property with white appearance and fresh color after dyeing, and is suitable for automobile interior decoration and outdoor application.
• R 2 OOC-R 1 -COOR 3 (wherein R 1 is a naphthalene ring, R 2 and R 3 are selected from group of hydrogen atoms or C 1 ⁇ C 4 alkyl, and R 2 is independent from R 3 , it can be the same or different with R 3 ; the position of substitute group for the naphthalene ring on the ester forming monomer can be: -2,3-, -2,5-, -2,6-, -2,7-, -1,2-, -1,3-, -1,4-, -1,5-, -1,6-, -1,7-, -1,8-).
• the compound is bonded into the polyester molecule in the form of copolymerization, no such problems as pollution and undesired sublimation degree caused by compound migrating to fiber surface therefore.
• the final product is a copolyester
• fiber produced by the copolyester has excellent physical property, without reduction of fiber physical property comparing with that of adding low molecule substance like aliphatic polyester polyol.
• the copolyester obtained has excellent whiteness, no normal yellowish problem caused by ultraviolet radiation absorbent, and fiber formed can be dyed to fresh color without the defect of dyeing offset.
• ester forming monomers of formula (1) used in the present invention include: 2,6-naphthalene-dicarboxylic acid, dimethyl-2,6-naphthalene-dicarboxylate, diethyl-2,6-naphthalene-dicarboxylate, dipropyl-2,6-naphthalene-dicarboxylate, di-n-butyl-2,6-naphthalene-dicarboxylate, 2,5-naphthalene-dicarboxylic acid, dimethyl-2,5-naphthalene-dicarboxylate, diethyl-2,5-naphthalene-dicarboxylate, dipropyl-2,5-naphthalene-dicarboxylate, di-n-butyl-2,5-naphthalene-dicarboxylate, and similar compounds etc.
• the addition amount of the ester forming monomers of formula (1), based upon the total dicarboxylic acid components, is between 0.05 ⁇ 100 moles %.
• the amount of the ester forming monomers of formula (1) is less than 0.05 moles %, the fiber thus obtained can not have good light fastness properties to fulfill the requirement in the car seat application.
• the higher amount of the ester forming monomers of formula (1) used the better improvement can be achieved.
• the actual amount used should be dependent upon the light fastness requirements of fibers. Basically, the minimum amount used should be at least 0.05 moles %, based upon the total dicarboxylic acid components, for effective improvement of light fastness.
• the addition amount of the ester forming monomers of formula (1) is more than 20 moles % and less than 80 moles % based upon the total dicarboxylic acid components, the copolyester formed is amorphous and can not go through the crystallization and drying operation necessary for the spinning process of fibers.
• the useful amount of the ester forming monomers of formula (1) is between 0.05 ⁇ 20 moles % and between 80 ⁇ 100 moles % based upon the total dicarboxylic acid components.
• ester forming monomers of formula (1) can be accomplished by the commonly known skills used in the polyester production. For example: in one embodiment, feed the dicarboxylic acid monomers having naphthalene structure together with terephthalic acid and ethylene glycol into reactor to conduct the esterification reaction, followed by addition of commonly used antimony or germanium compounds as the polycondensation catalyst, then proceed with polycondensation to obtain the copolyester.
• ester dicarboxylane of monomers having naphthalene structure together with dimethyl terephthalate, ethylene glycol into reactor to conduct the ester exchange reaction, followed by addition of stabilizer, antimony or germanium compounds as the polycondensation catalysts, then proceed with polycondensation to obtain the copolyester.
• the polyester in the present invention can be produced from dicarboxylic acid/ or its ester derivatives and diols.
• dicarboxylic acid and its ester derivatives are as follows: aromatic dicarboxylic acids such as terephathlic acid, isophthalic acid, 5-sulfoisophthalic acid sodium salt, 5-sulfisophthalic acid tetra-n-butyl phosphonium salt, 5-sulfisophthalic acid ethyl tri-n-butyl phosphonium salt; aliphatic dicarboxylic acids such as adipic acid, heptandioic acid, octandioic acid, azelaic acid, sebacic acid; cycloaliphatic dicarboxylic acids such as 1,4-cyclohexane dicarboxylic acid; alkyl esters of the above mentioned acids.
• diols are as follows: aliphatic diols such as ethlylene glycol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, iso-pentanediol; cyclic aliphatic diols such as 1,4-cyclohexanediol, 1,4-cyclohexanedimethanol; aromatic diols and ethylene oxide adducts of above mentioned diols such as p-dihydroxy phenyl, 2,2'-bis-(4-hydroxy phenyl) propane, bis-(4-hydroxy phenyl) naphthalene; polyglycols such as polyethylene glycol, polypropylene glycol, copolymer of ethylene giycol and propylene glycol, polytetramethylene glycol. If desired, ali
• additives such as deluster agents, fluorescent brighteners, antioxidants, bactericides, deodorants, antistatic agents, flame retardants, far infrared radiating ceramic powders, can be incorporated into the copolyester if required.
• the reaction shall not stop until the torque of mixer reaches to the desired value, then use nitrogen to press the polymer into the water for cooling, finally pelletize the polymer into chips.
• the copolyeseter obtained has an IV value of 0.0640, a melting point of 253.5°C, L value of 78 and b value of 2.5. Melting spin the copolyester chips by extruder at spinning temperature of 290°C and winding speed of 3200 meters/ min, producing 125denier/36 filament of POY(partially oriented yarn), which is subsequently subject to draw spinning into 75denier/ 36 filament. Weave to plain cloth and dye, the light fastness measured is Class 3.
• Example 1 was repeated except that the adding amount of 2,6-dimethyl naphthalene dicarboxylate was 0.5 mole %.
• the light fastness measured is Class 3.
• Example 1 was repeated except that the adding amount of 2,6-dimethyl naphthalene dicarboxylate was 1.0 mole %.
• the light fastness measured is Class 3 ⁇ 4.
• Example I was repeated except that the adding amount of 2,6-dimethyl naphthalene dicarboxylate was 0 mole % and the adding amount of dimethyl terephthalate was 194 parts.
• the polyester obtained has the L value of 78, and b value of 2.0 and Class 2 of light fastness.
• Example 1 was repeated except that the adding amount of 2,6-dimethyl naphthalene dicarboxylate was 10.0 mole %.
• the copolyester obtained has IV of 0.615, melting point of 228°C, L value of 78 and b value of 3.0. Take 1 part of the copolyester obtained with 9 parts of unmodified polyester without 2,6-dimethyl naphthalene dicarboxylate and mix them evenly in the form of chip blends (final content of 2,6-dimethyl naphthalene dicarboxylate is 1.0 mole %). Spin, draw, weave and dye the blends following the steps of Example 1. Measured light fastness of polyester obtained is Class 3 ⁇ 4.
• Example 4 was repeated to produce 10.0 mole % of 2,6-dimethyl naphthalene dicarboxylate. Take 1 part of the copolyester obtained with 1 part of unmodified polyester without 2,6-dimethyl naphthalene dicarboxylate and mix them evenly in the form of chip blends (final content of 2,6-dimethyl naphthalene dicarboxylate is 5.0 mole %).
• Measured light fastness of polyester obtained is Class 4.
• Example 4 was repeated except that 10.0 mole % of 2,6-dimethyl naphthalene dicarboxylate was woven into filament directly.
• the light fastness measured is Class 4 ⁇ 5.
• Example 1 was repeated except that the adding amount of 2,6-dimethyl naphthalene dicarboxylate was 244.21 parts, i.e., 100 mole %.
• the copolyester obtained has IV of 0.485, melting point of 265°C, L value of 77 and b value of 2.2.
• the light fastness measured is Class 5.
• Example 7 was repeated except that the adding amount of 2,6-dimethyl naphthalene dicarboxylate was changed to 92 mole % of 2,6-dimethyl naphthalene dicarboxylate and 8 mole % of dimethyl terephthalate.
• the copolyester obtained has IV of 0.512, melting point of 251°C, L value of 77 and b value of 1.6.
• the light fastness measured is Class 5.
• Example 6 was repeated except that the adding amount of 2,6-dimethyl naphthalene dicarboxylate was changed to 21 mole %.
• the copolyester obtained is amorphous, can not go through the crystallization and drying process to produce fiber.
• polyester obtained exhibits obvious yellowish with L value of 65 and b value of 13.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Polyesters Or Polycarbonates (AREA)
• Artificial Filaments (AREA)

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Citations (2)

• 2002
  • 2002-11-27 EP EP02026477A patent/EP1424414A1/fr not_active Withdrawn

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Non-Patent Citations (4)

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