CN103469355B - A kind of preparation method of fluorine-containing PET-PET blended fiber - Google Patents
A kind of preparation method of fluorine-containing PET-PET blended fiber Download PDFInfo
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Abstract
The present invention relates to a kind of preparation method of fluorine-containing PET-PET blended fiber, comprise the preparation of fluorine-containing PET and the preparation of blended fiber.Fluorine-containing PET be employing 2,5-difluoro terephthalic acid (TPA) or tetrafluoro terephthalic acid (TPA) and ethylene glycol as raw material, add inhibitor, carry out that esterification and polycondensation reaction obtain under suitable condition.And then mix with PET, take suitable co-blended spinning technique to prepare blended fiber.The fluorine-containing PET of gained of the present invention has good heat endurance and machinability, the introducing of fluorine atom, improves its hydrophobic and oil repellent performance.The fiber that co-blended spinning obtains not only possesses the excellent mechanical performances of PET, but also has good anti-pollution characteristic, has greatly saved cost again simultaneously, has made it at waterproof garment, have huge prospect in the Work Clothes manufacture of the Work Clothes born dirty and some special industry.
Description
Technical field
The present invention relates to a kind of preparation method of fluorine-containing PET-PET blended fiber, comprise the preparation of fluorine-containing PET and the preparation of blended fiber.Particularly relate to a kind of with poly-difluoro ethylene glycol terephthalate or polytetrafluoro ethylene glycol terephthalate for a kind of component, PET is the preparation method of the blended fiber of another kind of component.
Background technology
Along with the development and progress of technology, the continuous lifting that people require, the fiber of homogenous material is not well positioned to meet the demand of people sometimes, and various multicomponent fibre just arises at the historic moment.They have the fiber of homogenous material the performance that can not simultaneously possess, have the advantage of multiple fiber concurrently, better performance can be provided.Blended fiber can have the part excellent properties of two kinds of blend components simultaneously, and rational combining properties just can obtain the blended fiber of function admirable, and preparation technology is simple, can reduce the consumption of more expensive material simultaneously, cost-saving.
Polyester (PET) is one of the most widely used synthetic high polymer of the current mankind; PET has just been synthesized the forties as far back as twentieth century; and find that it has excellent performance, and be widely used in the fields such as weaving, packaging, health care, automobile, electronic apparatus, security protection, environmental protection.Along with the progress of society, the raising of living standards of the people, needs more and more higher to differential, the functionalization of polyester fiber.What therefore the modification of polyester also became particularly is important, and polyester modification object, except being optimized conventional polyester performance, mainly gives new polyester differential functional characteristic by modified method.Such as: antistatic, fire-retardant, moisture absorbing and sweat releasing, antifouling deodorization etc.At present, the main new varieties of polyester have: antistatic polyester, high-strength wearable polyester, imitative cotton ultra-soft polyester, super-hydrophobicity polyester, anti-soil polyester etc.At present, by introducing fluorine atom in the polymer, thus improving the surface property of material, as hydro-oleophobicity and soil resistance etc., and giving polyester material various function.Because fluoropolymer has low-surface-energy, low-friction coefficient and non-adhesiveness usually, dust dirt is difficult to the characteristics such as attachment, and therefore the anti-soil ABRASION RESISTANCE of fluoropolymer is good.And current fluoropolymer is based on fluoroolefin base polymer (such as: polytetrafluoroethylene (PTFE), Kynoar, fluorinated ethylene propylene copolymer, ethylene-tetrafluoroethylene copolymer etc.); The research of fluorochemical urethane, fluorochemical polyether, fluorine-containing polyester etc. then relatively lags behind.Many scholars are studied fluorochemical modified poly ester, and achieve certain achievement.The mode of current fluorochemical modified poly ester mainly by adding fluorine-containing end-capping reagent, or adds the fluorochemical such as Fluorinated dihydric alcohol, fluorine-containing binary acid and carrys out modified poly ester as Third monomer.Adopt adding of fluorine-containing end-capping reagent in Chinese patent CN101139434A, dimethyl isophthalate and butanediol adopt ester-interchange method, add fluorine-containing end-capping reagent N-ethoxy perfluoro-octanoyl amine, have prepared the low and polyester material that contaminated resistance is good of fluorinated volume.Hu Juan (Hu Juan. the MOLECULE DESIGN of fluorine-containing polyester and photoresist waveguide material and performance study [D]. Master's thesis, Jilin: Jilin University, 2007.) principle of MOLECULE DESIGN is utilized, by adding the mode of Fluorinated dihydric alcohol copolymerization, paraphthaloyl chloride, hexafluoro bisphenol-a and fluorine-containing ethohexadiol ternary polymerization are synthesized the polyester of novel high fluorinated volume.This polyester has excellent performance and is applied to optical waveguide material.But the polyester these being contained fluorine element is applied in weaving and packaging material certain limitation, subject matter is that the molecular weight of polyesters containing fluorine element of prior art is low, can not meet the requirement of spinning and film forming; Prior art mainly gives its water proof anti-soil function by the fluorine-containing Final finishing mode of fabric at present, and the maximum shortcoming of these class methods is to be difficult to solve the problems such as ageing, durability and ABRASION RESISTANCE, and wastes time and energy.
Therefore, developing fluorine-containing polyester blend fiber for weaving and the modification of super-hydrophobic, hydrophobic and oil repellent, antifouling property of packaging material, important theory significance and using value will be had.
Summary of the invention
The object of this invention is to provide a kind of preparation method of fluorine-containing PET-PET blended fiber, comprise the preparation of fluorine-containing PET and the preparation of blended fiber.Wherein fluorine-containing PET refers to poly-difluoro ethylene glycol terephthalate or polytetrafluoro ethylene glycol terephthalate.Fluorine-containing PET of the present invention introduces fluorine atom on the main chain of polymer, and the fluorine-containing PET section of preparing can be directly used in spinning, can give fluorine-containing PET permanent hydrophobic and oil repellent performance, solve the problem that the modification of conventional P ET fiber hydrophobic and oil repellent is wasted time and energy.Meanwhile, adopt co-blended spinning prepare with fluorine-containing PET be a kind of component, the PET blended fiber that is another kind of component, not give only the hydrophobic and oil repellent performance that blended fiber is good, also provide cost savings greatly.
The preparation method of a kind of fluorine-containing PET-PET blended fiber of the present invention, a kind of component of described fluorine-containing PET-PET blended fiber is fluorine-containing PET, and another component is PET; Described fluorine-containing PET is polytetrafluoro ethylene glycol terephthalate or poly-difluoro ethylene glycol terephthalate, and its general structure is
Or
Wherein n=80 ~ 200; The mass ratio of two kinds of components of described fluorine-containing PET-PET blended fiber is 0.1 ~ 0.9:0.9 ~ 0.1; The filament number of described fluorine-containing PET-PET blended fiber is 0.5 ~ 15dtex; The preparation method of described fluorine-containing PET-PET blended fiber, comprise the preparation method of fluorine-containing PET and the preparation method of blended fiber, concrete steps are:
1. the preparation method of fluorine-containing PET
Be divided into esterification and polycondensation reaction two step; Concrete steps are:
Described esterification:
Adopt fluorine-containing terephthalic acid (TPA) and ethylene glycol as raw material, add inhibitor, the addition of described inhibitor is 0.01% ~ 0.05% of described fluorine-containing terephthalic acid (TPA) weight, carries out esterification after being made into uniform sizing material; Esterification is pressurizeed in nitrogen atmosphere, and Stress control is at normal pressure ~ 0.4MPa, and temperature is at 230 ~ 250 DEG C, and esterification water quantity of distillate reaches more than 90% of theoretical value for esterification terminal;
Described fluorine-containing terephthalic acid (TPA) is tetrafluoro terephthalic acid (TPA) or 2,5-difluoro terephthalic acid (TPA);
Described inhibitor is the one in magnesia, silica, calcium oxide, zinc oxide and manganese oxide; There is fluorine atom in the phenyl ring due to dicarboxylic acids used, the electronegativity of fluorine atom is large, in the conjugation of esterification stage fluorine atom, the acidity of dicarboxylic acids is strengthened, cause the activity of carboxyl in dicarboxylic acids to increase simultaneously, reaction speed is accelerated, and reaction speed increase easily makes side reaction produce, these side reaction products have larger impact to follow-up polycondensation reaction, particularly generate the end-cap product of alkene and aldehyde, constrain the increase of molecular weight of product; From experimental result, if do not add inhibitor, the molecular weight of polyesters of synthesis is on the low side, can not meet the demand of spinning and film forming; The speed added for controlling the esterification stage of inhibitor, decreases side reaction, improves the molecular weight of product, makes fluorine polyester meet spinning requirement.
Usually, it is the hydrogen ion that ionized out by the dicarboxylic acids used catalyst as esterification in polyester esterification process, carry out self-catalyzed reaction, by regulating the temperature of esterification, pressure and the micromolecular speed ejecting its esterification of control, but the prerequisite of carrying out esterification under certain reaction temperature and pressure, just will can carry out esterification.When temperature is too low or pressure is inadequate, esterification can not carry out or speed extremely slow, thus affect follow-up technique.If the Small molecular in esterification is failed timely discharge and is easily caused unnecessary side reaction.In the building-up process of fluorine polyester, due to the conjugation of fluorine, at esterification stage fluorine atom, the acidity of dicarboxylic acids is strengthened, cause the activity of carboxyl in dicarboxylic acids to increase, reaction speed is accelerated, and side reaction increases simultaneously, be difficult to control, and then affect the growth of molecular weight of product, therefore add inhibitor, namely by selecting metal oxide used to regulate.Described metal oxide can dissociate by the following two kinds mode:
Here M is metal ion, if the electronegativity of M is quite large, has stronger attraction, O-H key so just can be made to weaken to the duplet of oxonium ion, is conducive to reacting dissociation; On the contrary, if the electronegativity of M is little, so just alkali center will be generated.M-O-H is similar with amphoteric compound, when there being alkaline matter to exist, reacting and the mode by acid dissociation being carried out; And when acidic materials exist, then undertaken by the mode of alkali formula ionization.The M-O of back reaction from acid dissociation mode and alkali formula ionization mode
-and M
+visible, M
+as acid centre, its intensity only has direct relation with the electronegativity of metal ion, and M-O
-in O ion then relevant with the negative charge density on oxygen as the intensity at alkali center, negative charge density is larger, and intensity is also larger.Negative charge density on visible oxonium ion and metal ion electronegativity have close relationship, and metal ion electronegativity is less, and negative charge density is larger.So, acidity and the alkalescence of metal oxide have just all connected with the electronegativity of metal ion, and the oxide that the electronegativity of metal ion is large is mainly acid, and what electronegativity was little is then alkalescence.
Described polycondensation reaction:
Comprise polycondensation reaction low vacuum stage and polycondensation reaction high vacuum stage of Fig;
The described polycondensation reaction low vacuum stage, in esterification products, add catalyst and stabilizing agent, under the condition of negative pressure, start polycondensation reaction, this staged pressure is steadily evacuated to below absolute pressure 1KPa by normal pressure, temperature controls at 250 ~ 270 DEG C, and the reaction time is 40 ~ 60 minutes;
Described polycondensation reaction high vacuum stage of Fig, after the described polycondensation reaction low vacuum stage, continues to vacuumize, and makes reaction pressure be down to absolute pressure and is less than 100Pa, and reaction temperature controls at 270 ~ 285 DEG C, 1 ~ 2 hour reaction time.Polycondensation reaction to be as the criterion judgement reaction end with reactor stirring motor power or in-line viscometer reading.
2. the preparation method of fluorine-containing PET-PET blended fiber
By described fluorine-containing PET and PET mixing, carry out co-blended spinning, spinning temperature is 275-290 DEG C, and winding speed controls at 2700 ~ 3200m/min.
As preferred technical scheme:
The preparation method of a kind of fluorine-containing PET-PET blended fiber as above, the mol ratio of described ethylene glycol and fluorine-containing terephthalic acid (TPA) is 1.2 ~ 2.0:1.
The preparation method of a kind of fluorine-containing PET-PET blended fiber as above, described catalyst is selected from the one in antimonous oxide, antimony glycol and antimony acetate, and catalyst amount is 0.01% ~ 0.05% of described fluorine-containing terephthalic acid (TPA) weight.
The preparation method of a kind of fluorine-containing PET-PET blended fiber as above, described stabilizing agent is selected from the one in triphenyl phosphate, trimethyl phosphate and Trimethyl phosphite, and stabilizing agent dosage is 0.01% ~ 0.05% of described fluorine-containing terephthalic acid (TPA) weight.
In the esterification stage of the present invention, reaction end reaches theoretical value more than 90% by the water quantity of distillate produced actual in esterification to be grasped.Theoretical value is the quantity of distillate by gained water during chemical equation complete reaction.Because esterification is originally as reversible reaction, moreover raw material has residual in conveyance conduit, and along with the carrying out reacted, the viscosity of system increases, and the shipwreck that esterification can be caused to produce is therefrom to discharge.
In polycondensation reaction high vacuum stage of Fig of the present invention, the numerical value that reaction end reaches setting by reactor beater motor power and in-line viscometer calculation value is grasped.The setting numerical value of its reactor beater motor power of different devices and in-line viscometer calculation value is not necessarily identical, and the determination of setting numerical value can by obtaining the analysis of polyester slice.
The fluorine-containing PET of gained of the present invention is due to the introducing of fluorine atom, improve the hydrophobic and oil repellent performance of PET material, so with the fluorine-containing PET in the present invention for a kind of component, PET is that the blended fiber of another kind of component not only has good mechanical property, also there is good permanent resistance to greasy dirt performance, and cost reduces greatly, make it at waterproof garment, in the Work Clothes manufacture of the Work Clothes born dirty and some special industry, have huge prospect.
Beneficial effect:
1, obtained PET contain fluorine atoms; due to the strong electronegativity of fluorine; high C-F bond energy and make the copolyesters synthesized except promoting except the performance of conventional P ET further to the shielding protection effect of carbochain; also reduce the surface energy of PET material; fluorine-containing PET material is made to have permanent hydrophobic and oil repellent, oil rub resistance performance.
2, the speed of esterification can be controlled in fluorine-containing PET esterification process by inhibiting, reduce the generation of side reaction.
3, the fluorine-containing PET section of gained can direct fabrics.
4, the fluorine-containing PET of gained has good heat endurance and machinability.
5, adopt that fluorine-containing PET is a kind of component, PET is that the blended fiber that another kind of component obtains has good mechanical property and permanent resistance to greasy dirt performance, and compare the fiber being used alone fluorine-containing PET and preparing, cost reduces greatly, thus has better using value.
Detailed description of the invention
Below in conjunction with detailed description of the invention, set forth the present invention further.Should be understood that these embodiments are only not used in for illustration of the present invention to limit the scope of the invention.In addition should be understood that those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values fall within the application's appended claims limited range equally after the content of having read the present invention's instruction.
The fluorine-containing PET-PET blended fiber of one of the present invention, a kind of component is fluorine-containing PET, and another component is PET; Described fluorine-containing PET is polytetrafluoro ethylene glycol terephthalate or poly-difluoro ethylene glycol terephthalate, and its general structure is
Or
Wherein n=80 ~ 200.
The fluorine-containing PET-PET blended fiber of one as above, the mass ratio of two kinds of components of described fluorine-containing PET-PET blended fiber is 0.1 ~ 0.9:0.9 ~ 0.1.
The fluorine-containing PET-PET blended fiber of one as above, the filament number of described fluorine-containing PET-PET blended fiber is 0.5 ~ 15dtex.
Embodiment 1
1, the preparation method of fluorine-containing PET: be divided into esterification and polycondensation reaction two step, concrete steps are:
Described esterification:
Adopt mol ratio be the ethylene glycol of 1.2:1 and tetrafluoro terephthalic acid (TPA) as raw material, add the magnesia of 0.01% of tetrafluoro terephthalic acid (TPA) weight simultaneously, after being made into uniform sizing material, carry out esterification; Esterification is in nitrogen atmosphere, and Stress control is at 0.4MPa, and temperature controls at 250 DEG C, and esterification water quantity of distillate reaches 90% of theoretical value for esterification terminal.
Described polycondensation reaction:
Comprise polycondensation reaction low vacuum stage and polycondensation reaction high vacuum stage of Fig:
The described polycondensation reaction low vacuum stage, the stabilizing agent triphenyl phosphate of the catalytic antimony trioxide of 0.01% of tetrafluoro terephthalic acid (TPA) weight and 0.01% of tetrafluoro terephthalic acid (TPA) weight is added in esterification products, polycondensation reaction is started under the condition of negative pressure, this staged pressure is steadily evacuated to absolute pressure by normal pressure and is less than 1KPa, temperature controls at 255 DEG C, and the reaction time is 60 minutes.
Described polycondensation reaction high vacuum stage of Fig, after the described polycondensation reaction low vacuum stage, continues to vacuumize, and makes reaction pressure be down to absolute pressure and is less than 100Pa, and reaction temperature controls at 270 DEG C, 2 hours reaction time.Polycondensation reaction to be as the criterion judgement reaction end with reactor stirring motor power or in-line viscometer reading.The discharging when polymer viscosity reaches desirable value, through Cast Strip, cooling, pelletizing, namely obtain fluorine-containing polyester slice.
2, the preparation method of fluorine-containing PET-PET blended fiber: by described fluorine-containing PET and PET mixing, carry out co-blended spinning, the mass ratio of fluorine-containing PET and PET is 0.9:0.1, spinning temperature is 275 DEG C, winding speed controls at 2700m/min, and the fiber number of obtained fluorine-containing PET-PET blended fiber is 15dtex.
Embodiment 2
1, the preparation method of fluorine-containing PET, be divided into esterification and polycondensation reaction two step, concrete steps are:
Described esterification:
Adopt mol ratio be the ethylene glycol of 1.4:1 and 2,5-difluoro terephthalic acid (TPA) as raw material, add the silica of 0.03% of 2,5-difluoro terephthalic acid (TPA) weight simultaneously, after being made into uniform sizing material, carry out esterification; Esterification is pressurizeed in nitrogen atmosphere, and Stress control is at 0.3MPa, and temperature controls at 245 DEG C, and esterification water quantity of distillate reaches 90% of theoretical value for esterification terminal.
Described polycondensation reaction:
Comprise polycondensation reaction low vacuum stage and polycondensation reaction high vacuum stage of Fig:
The described polycondensation reaction low vacuum stage, 2 are added in esterification products, 5-difluoro terephthalic acid (TPA) weight 0.02% catalyst glycol antimony and 2,5-difluoro terephthalic acid (TPA) weight 0.02% stabilizing agent trimethyl phosphate, polycondensation reaction is started under the condition of negative pressure, this staged pressure is steadily evacuated to absolute pressure by normal pressure and is less than 800Pa, and temperature controls at 250 DEG C, and the reaction time is 50 minutes.
Described polycondensation reaction high vacuum stage of Fig, after the described polycondensation reaction low vacuum stage, continues to vacuumize, and makes reaction pressure be down to absolute pressure and is less than 80Pa, and reaction temperature controls at 275 DEG C, 2 hours reaction time.Polycondensation reaction to be as the criterion judgement reaction end with reactor stirring motor power or in-line viscometer reading.The discharging when polymer viscosity reaches desirable value, through Cast Strip, cooling, pelletizing, namely obtain fluorine-containing polyester slice.
2, the preparation method of fluorine-containing PET-PET blended fiber: by described fluorine-containing PET and PET mixing, carry out co-blended spinning, the mass ratio of fluorine-containing PET and PET is 0.1:0.9, spinning temperature is 290 DEG C, winding speed controls at 3200m/min, and the fiber number of obtained fluorine-containing PET-PET blended fiber is 0.5dtex.
Embodiment 3
1, the preparation method of fluorine-containing PET, be divided into esterification and polycondensation reaction two step, concrete steps are:
Described esterification:
Adopt mol ratio be the ethylene glycol of 1.6:1 and tetrafluoro terephthalic acid (TPA) as raw material, add the calcium oxide of 0.05% of tetrafluoro terephthalic acid (TPA) weight simultaneously, after being made into uniform sizing material, carry out esterification; Esterification is pressurizeed in nitrogen atmosphere, and Stress control is at 0.2MPa, and temperature controls at 240 DEG C, and esterification water quantity of distillate reaches 90% of theoretical value for esterification terminal.
Described polycondensation reaction:
Comprise polycondensation reaction low vacuum stage and polycondensation reaction high vacuum stage of Fig:
The described polycondensation reaction low vacuum stage, the stabilizing agent Trimethyl phosphite of the catalyst acetic acid antimony of 0.03% of tetrafluoro terephthalic acid (TPA) weight and 0.03% of tetrafluoro terephthalic acid (TPA) weight is added in esterification products, polycondensation reaction is started under the condition of negative pressure, this staged pressure is steadily evacuated to absolute pressure by normal pressure and is less than 600Pa, temperature controls at 260 DEG C, and the reaction time is 50 minutes.
Described polycondensation reaction high vacuum stage of Fig, after the described polycondensation reaction low vacuum stage, continues to vacuumize, and makes reaction pressure be down to absolute pressure and is less than 60Pa, and reaction temperature controls at 280 DEG C, 1.5 hours reaction time.Polycondensation reaction to be as the criterion judgement reaction end with reactor stirring motor power or in-line viscometer reading.The discharging when polymer viscosity reaches desirable value, through Cast Strip, cooling, pelletizing, namely obtain fluorine-containing polyester slice.
2, the preparation method of fluorine-containing PET-PET blended fiber: by described fluorine-containing PET and PET mixing, carry out co-blended spinning, the mass ratio of fluorine-containing PET and PET is 0.5:0.5, spinning temperature is 280 DEG C, winding speed controls at 3000m/min, and the fiber number of obtained fluorine-containing PET-PET blended fiber is 3dtex.
Embodiment 4
1, the preparation method of fluorine-containing PET, be divided into esterification and polycondensation reaction two step, concrete steps are:
Described esterification:
Adopt mol ratio be the ethylene glycol of 1.8:1 and tetrafluoro terephthalic acid (TPA) as raw material, add the calcium oxide of 0.03% of tetrafluoro terephthalic acid (TPA) weight simultaneously, after being made into uniform sizing material, carry out esterification; Esterification is pressurizeed in nitrogen atmosphere, and Stress control is at 0.2MPa, and temperature controls at 235 DEG C, and esterification water quantity of distillate reaches 90% of theoretical value for esterification terminal.
Described polycondensation reaction:
Comprise polycondensation reaction low vacuum stage and polycondensation reaction high vacuum stage of Fig:
The described polycondensation reaction low vacuum stage, the stabilizing agent trimethyl phosphate of the catalytic antimony trioxide of 0.04% of tetrafluoro terephthalic acid (TPA) weight and 0.04% of tetrafluoro terephthalic acid (TPA) weight is added in esterification products, polycondensation reaction is started under the condition of negative pressure, this staged pressure is steadily evacuated to absolute pressure by normal pressure and is less than 500Pa, temperature controls at 265 DEG C, and the reaction time is 50 minutes.
Described polycondensation reaction high vacuum stage of Fig, after the described polycondensation reaction low vacuum stage, continues to vacuumize, and makes reaction pressure be down to absolute pressure and is less than 50Pa, and reaction temperature controls at 280 DEG C, 1 hour reaction time.Polycondensation reaction to be as the criterion judgement reaction end with reactor stirring motor power or in-line viscometer reading.The discharging when polymer viscosity reaches desirable value, through Cast Strip, cooling, pelletizing, namely obtain fluorine-containing polyester slice.
2, the preparation method of fluorine-containing PET-PET blended fiber: by described fluorine-containing PET and PET mixing, carry out co-blended spinning, the mass ratio of fluorine-containing PET and PET is 0.6:0.4, spinning temperature is 285 DEG C, winding speed controls at 3100m/min, and the fiber number of obtained fluorine-containing PET-PET blended fiber is 8dtex.
Embodiment 5
1, the preparation method of fluorine-containing PET, be divided into esterification and polycondensation reaction two step, concrete steps are:
Described esterification:
Adopt mol ratio be the ethylene glycol of 2.0:1 and 2,5-difluoro terephthalic acid (TPA) as raw material, add the manganese oxide of 0.04% of 2,5-difluoro terephthalic acid (TPA) weight simultaneously, after being made into uniform sizing material, carry out esterification; Esterification is pressurizeed in nitrogen atmosphere, and Stress control is at normal pressure, and temperature controls at 230 DEG C, and esterification water quantity of distillate reaches 90% of theoretical value for esterification terminal.
Described polycondensation reaction:
Comprise polycondensation reaction low vacuum stage and polycondensation reaction high vacuum stage of Fig:
The described polycondensation reaction low vacuum stage, 2 are added in esterification products, 5-difluoro terephthalic acid (TPA) weight 0.05% the catalytic antimony trioxide and 2,5-difluoro terephthalic acid (TPA) weight 0.05% stabilizing agent triphenyl phosphate, polycondensation reaction is started under the condition of negative pressure, this staged pressure is steadily evacuated to absolute pressure by normal pressure and is less than 400Pa, and temperature controls at 270 DEG C, and the reaction time is 40 minutes.
Described polycondensation reaction high vacuum stage of Fig, after the described polycondensation reaction low vacuum stage, continues to vacuumize, and makes reaction pressure be down to absolute pressure and is less than 50Pa, and reaction temperature controls at 285 DEG C, 1 hour reaction time.Polycondensation reaction to be as the criterion judgement reaction end with reactor stirring motor power or in-line viscometer reading.The discharging when polymer viscosity reaches desirable value, through Cast Strip, cooling, pelletizing, namely obtain fluorine-containing polyester slice.
2, the preparation method of fluorine-containing PET-PET blended fiber: by described fluorine-containing PET and PET mixing, carry out co-blended spinning, the mass ratio of fluorine-containing PET and PET is 0.8:0.2, spinning temperature is 287 DEG C, winding speed controls at 2800m/min, and the fiber number of obtained fluorine-containing PET-PET blended fiber is 10dtex.
Claims (4)
1. a preparation method for fluorine-containing PET-PET blended fiber, is characterized in that: a kind of component of described fluorine-containing PET-PET blended fiber is fluorine-containing PET, and another component is PET; Described fluorine-containing PET is polytetrafluoro ethylene glycol terephthalate or poly-difluoro ethylene glycol terephthalate, and its general structure is
Or
Wherein n=80 ~ 200; The mass ratio of two kinds of components of described fluorine-containing PET-PET blended fiber is 0.1 ~ 0.9:0.9 ~ 0.1; The filament number of described fluorine-containing PET-PET blended fiber is 0.5 ~ 15dtex; The preparation method of described fluorine-containing PET-PET blended fiber, comprise the preparation method of fluorine-containing PET and the preparation method of blended fiber, concrete steps are:
1) preparation method of described fluorine-containing PET is divided into esterification and polycondensation reaction two step;
Described esterification:
Adopt fluorine-containing terephthalic acid (TPA) and ethylene glycol as raw material, add inhibitor, the addition of described inhibitor is 0.01% ~ 0.05% of described fluorine-containing terephthalic acid (TPA) weight, carries out esterification, obtain esterification products after being made into uniform sizing material; Esterification is pressurizeed in nitrogen atmosphere, and Stress control is at normal pressure ~ 0.4MPa, and temperature is at 230 ~ 250 DEG C, and esterification water quantity of distillate reaches more than 90% of theoretical value for esterification terminal;
Described fluorine-containing terephthalic acid (TPA) is tetrafluoro terephthalic acid (TPA) or 2,5-difluoro terephthalic acid (TPA);
Described inhibitor is the one in magnesia, silica, calcium oxide, zinc oxide and manganese oxide;
Described polycondensation reaction:
Comprise polycondensation reaction low vacuum stage and polycondensation reaction high vacuum stage of Fig:
The described polycondensation reaction low vacuum stage, in described esterification products, add catalyst and stabilizing agent, under the condition of negative pressure, start polycondensation reaction, this staged pressure is steadily evacuated to below absolute pressure 1KPa by normal pressure, temperature controls at 250 ~ 270 DEG C, and the reaction time is 40 ~ 60 minutes;
Described polycondensation reaction high vacuum stage of Fig, after the described polycondensation reaction low vacuum stage, continues to vacuumize, and makes reaction pressure be down to absolute pressure and is less than 100Pa, and reaction temperature controls at 270 ~ 285 DEG C, 1 ~ 2 hour reaction time;
Obtained fluorine-containing PET;
2) preparation method of described blended fiber is: by described fluorine-containing PET and PET mixing, carry out co-blended spinning, spinning temperature is 275-290 DEG C, and winding speed controls at 2700 ~ 3200m/min.
2. the preparation method of a kind of fluorine-containing PET-PET blended fiber according to claim 1, is characterized in that, the mol ratio of described ethylene glycol and fluorine-containing terephthalic acid (TPA) is 1.2 ~ 2.0:1.
3. the preparation method of a kind of fluorine-containing PET-PET blended fiber according to claim 1, it is characterized in that, described catalyst is selected from the one in antimonous oxide, antimony glycol and antimony acetate, and catalyst amount is 0.01% ~ 0.05% of described fluorine-containing terephthalic acid (TPA) weight.
4. the preparation method of a kind of fluorine-containing PET-PET blended fiber according to claim 1, it is characterized in that, described stabilizing agent is selected from the one in triphenyl phosphate, trimethyl phosphate and Trimethyl phosphite, and stabilizing agent dosage is 0.01% ~ 0.05% of described fluorine-containing terephthalic acid (TPA) weight.
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| CN104530406A (en) * | 2014-12-12 | 2015-04-22 | 东华大学 | Fluorine-containing anti-fouling fire-resisting polyester and preparation method thereof |
| CN104497291A (en) * | 2014-12-12 | 2015-04-08 | 东华大学 | Antifouling and flame-retardant polyester fibres and preparation method thereof |
| CN113072699B (en) * | 2021-03-09 | 2022-03-01 | 东莞市华盈新材料有限公司 | Low-hygroscopicity PA10T and synthesis method thereof |
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| CN101139434B (en) * | 2007-09-30 | 2011-06-22 | 大连理工大学 | Fluorinated polyesters with low surface energy and preparation method thereof |
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Effective date of registration: 20210528 Address after: No. 58, Yingbin Avenue, Xiadu community, Pingnan County, Guigang City, Guangxi Zhuang Autonomous Region, 537300 Patentee after: Li Weizhi Address before: 215228 industrial concentration area, Shengze Town, Wujiang City, Suzhou City, Jiangsu Province Patentee before: JIANGSU LIXIN CHEMICAL FIBER TECHNOLOGY Co.,Ltd. |
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