CN103526335B - A kind of preparation method of fluorine-containing PBT-PBT core-skin composite fiber - Google Patents
A kind of preparation method of fluorine-containing PBT-PBT core-skin composite fiber Download PDFInfo
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Abstract
The present invention relates to a kind of preparation method of fluorine-containing PBT-PBT core-skin composite fiber, comprise the preparation of the fluorine-containing PBT of cortical material and the preparation of core-skin composite fiber.Fluorine-containing PBT adopts tetrafluoro terephthalic acid (TPA) and BDO as raw material, adds inhibitor, carries out that esterification and polycondensation reaction obtain under suitable condition.Then with fluorine-containing PBT be skin, PBT for core, take suitable composite spinning technology to prepare core-skin composite fiber.The fluorine-containing PBT 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 composite spinning obtains not only possesses the excellent mechanical performances of PBT, 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 PBT-PBT core-skin composite fiber, comprise the preparation of the fluorine-containing PBT of cortical material and the preparation of core-skin composite fiber.Particularly relating to one with polytetrafluoro mutual-phenenyl two acid bromide two alcohol ester for the fluorine-containing PBT material of cortex, take PBT as the preparation method of the core-skin composite fiber of core material.
Background technology
Along with the development and progress of technology, the continuous lifting that people require, the fiber of homogenous material has not been well positioned to meet the demand of people, and various composite 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, can provide better performance, wherein, core-skin composite fiber is exactly a kind of well composite fibre.This fiber can not only have the partial properties that Cortical fiber possesses, also have the partial properties of core fibers, rational combining properties just can obtain the core-skin composite fiber of function admirable, and preparation technology is simple, the consumption of cortical material can be reduced simultaneously, cost-saving.
Polyester is one of the most widely used synthetic high polymer of the current mankind; ethylene glycol terephthalate (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.Polybutylene terephthalate (PBT) (PBT) is a kind of crystallinity line style saturated polyester, have high temperature resistant, moisture-proof, electrical insulation capability are good, oil resistant, resistance to chemical attack, the shaping feature such as soon.Its some application examples in the industry demonstrate its superiority that can not be substituted in some aspects, now it has become the fifth-largest general engineering plastic after polyamide (PA), Merlon (PC), polyformaldehyde (POM) and Noryl (MPPO), is widely used in auto industry, electronic apparatus industry, food medicine equipment, packaging material, environmental project, communication apparatus, Sport & Casual apparatus etc.Deepen constantly along with to the research of PBT stuctures and properties, not only develop different stage, dissimilar engineering plastics, as HI high impact, heat-resisting, fire-retardant etc., and its application in synthetic fiber is more and more paid attention to.PBT fibrous elasticity is superior, soft, and dyeing is convenient, has the advantage of terylene, polyamide fibre, spandex three concurrently.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, the fluorine-containing polyester sheath core compound fibre of development of new, for weaving and the modification of super-hydrophobic, hydrophobic and oil repellent, antifouling property of packaging material, will have important theory significance and using value.At waterproof garment, in the Work Clothes manufacture of the Work Clothes born dirty and some special industry, there is huge prospect.
Summary of the invention
The object of this invention is to provide a kind of preparation method of fluorine-containing PBT-PBT core-skin composite fiber, comprise the preparation of the fluorine-containing PBT of cortical material and the preparation of core-skin composite fiber.Wherein fluorine-containing PBT refers to polytetrafluoro mutual-phenenyl two acid bromide two alcohol ester.Fluorine-containing PBT of the present invention introduces fluorine atom on the main chain of polymer, and the fluorine-containing PBT section of preparing can be directly used in spinning, can give fluorine-containing PBT fiber permanent hydrophobic and oil repellent performance, solve the problem that the modification of conventional P BT fiber hydrophobic and oil repellent is wasted time and energy.Meanwhile, adopt composite spinning method prepare with fluorine-containing PBT be cortical material, the PBT core-skin composite fiber that is core material, not give only the hydrophobic and oil repellent performance that core-skin composite fiber is good, also provide cost savings greatly.
The preparation method of a kind of fluorine-containing PBT-PBT core-skin composite fiber of the present invention, cortical material is fluorine-containing PBT, and core material is PBT; Described fluorine-containing PBT is polytetrafluoro mutual-phenenyl two acid bromide two alcohol ester, and its general structure is
Wherein n=70 ~ 150; The ratio of the described fluorine-containing cortex of PBT-PBT core-skin composite fiber and the sectional area of sandwich layer is 2 ~ 5:5.
The fluorine-containing PBT-PBT core-skin composite fiber of one as above, the filament number of described fluorine-containing PBT-PBT core-skin composite fiber is 1 ~ 15dtex; Comprise the preparation method of fluorine-containing PBT and the preparation method of core-skin composite fiber, concrete steps are:
1. the preparation method of fluorine-containing PBT
Be divided into esterification and polycondensation reaction two step; Concrete steps are:
Described esterification:
Adopt tetrafluoro terephthalic acid (TPA) and BDO as raw material, add inhibitor, the addition of described inhibitor is 0.01% ~ 0.05% of described tetrafluoro terephthalic acid (TPA) weight, carries out esterification after being made into uniform sizing material; Esterification is pressurizeed in nitrogen atmosphere, and Stress control carries out being less than under absolute pressure 1KPa, and temperature is at 160 ~ 220 DEG C, and the time is 2 ~ 3 hours, and esterification water quantity of distillate reaches more than 90% of theoretical value for esterification terminal;
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, make to 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 building-up process, 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;
In the described polycondensation reaction low vacuum stage, add catalyst and stabilizing agent in esterification products, under the condition of negative pressure, start polycondensation reaction, described negative pressure refers to below absolute pressure 500Pa, and temperature controls at 260 ~ 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 ~ 275 DEG C, 3 ~ 4 hours 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 PBT-PBT core-skin composite fiber
Using described fluorine-containing PBT as cortical material, PBT, as core material, carries out core-sheath spinning, and spinning temperature is 270-280 DEG C, and winding speed controls at 2700 ~ 3200m/min.
As preferred technical scheme:
The preparation method of a kind of fluorine-containing PBT-PBT core-skin composite fiber as above, the mol ratio of described butanediol and tetrafluoro terephthalic acid (TPA) is 1.4 ~ 2.0:1.
The preparation method of a kind of fluorine-containing PBT-PBT core-skin composite fiber as above, described catalyst is selected from the one in butyl titanate, tetraisopropyl titanate, tetraethyl titanate, stannous acetate, dibutyltin diacetate, and catalyst amount is 0.01% ~ 0.05% of described tetrafluoro terephthalic acid (TPA) weight.
The preparation method of a kind of fluorine-containing PBT-PBT core-skin composite 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 tetrafluoro 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 PBT of gained of the present invention is due to the introducing of fluorine atom, improve the hydrophobic and oil repellent performance of PBT material, so with the fluorine-containing PBT in the present invention for cortex, PBT is that the core-skin composite fiber of sandwich layer 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 PBT 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 polyester further to the shielding protection effect of carbochain; also reduce the surface energy of polyester material; 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 PBT esterification process by inhibiting, reduce the generation of side reaction.
3, the fluorine-containing PBT section of gained can direct fabrics.
4, the fluorine-containing PBT of gained has good heat endurance and machinability.
5, adopt that fluorine-containing PBT is cortical material, PBT is that the core-skin composite fiber that core material obtains has good mechanical property and permanent resistance to greasy dirt performance, and compare the fiber being used alone fluorine-containing PBT 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 PBT-PBT core-skin composite fiber of one of the present invention, cortical material is fluorine-containing PBT, and core material is PBT; Described fluorine-containing PBT is polytetrafluoro mutual-phenenyl two acid bromide two alcohol ester, and its general structure is
Wherein n=70 ~ 150.
The fluorine-containing PBT-PBT core-skin composite fiber of one as above, the ratio of the described fluorine-containing cortex of PBT-PBT core-skin composite fiber and the sectional area of sandwich layer is 2 ~ 5:5.
The fluorine-containing PBT-PBT core-skin composite fiber of one as above, the filament number of described fluorine-containing PBT-PBT core-skin composite fiber is 1 ~ 15dtex.
Embodiment 1
1. the preparation method of fluorine-containing PBT polyester, is divided into esterification and polycondensation reaction two step.Concrete steps are:
Described esterification:
Adopt mol ratio be the BDO of 1.4:1 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 below 1KPa, and temperature controls at 220 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 catalyst butyl titanate 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, described negative pressure refers to that absolute pressure is less than 500Pa, temperature controls at 265 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, 4 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 PBT polyester section.
2. the preparation of core-skin composite fiber: using described fluorine-containing PBT as cortical material, PBT is as core material, carry out core-sheath spinning, the ratio of the cross-sectional area of cortex and sandwich layer is 2:5, spinning temperature is 270 DEG C, winding speed controls at 2700m/min, and the filament number of the fluorine-containing PBT-PBT core-skin composite fiber of gained is 1dtex.
Embodiment 2
1. the preparation method of fluorine-containing PBT polyester, is divided into esterification and polycondensation reaction two step.Concrete steps are:
Described esterification:
Adopt mol ratio be the BDO of 1.6:1 and tetrafluoro terephthalic acid (TPA) as raw material, add the silica of 0.02% 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 below 900Pa, and temperature controls at 200 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 catalyst metatitanic acid four isopropyl ester of 0.02% of tetrafluoro terephthalic acid (TPA) weight and 0.02% of tetrafluoro terephthalic acid (TPA) weight is added in esterification products, polycondensation reaction is started under the condition of negative pressure, described negative pressure refers to that absolute pressure is less than 400Pa, temperature controls at 260 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 80Pa, and reaction temperature controls at 270 DEG C, 4 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 PBT polyester section.
2. the preparation of core-skin composite fiber: using described fluorine-containing PBT as cortical material, PBT is as core material, carry out core-sheath spinning, the ratio of the cross-sectional area of cortex and sandwich layer is 4:5, spinning temperature is 274 DEG C, winding speed controls at 3200m/min, and the filament number of the fluorine-containing PBT-PBT core-skin composite fiber of gained is 15dtex.
Embodiment 3
1. the preparation method of fluorine-containing PBT polyester, is divided into esterification and polycondensation reaction two step.Concrete steps are:
Described esterification:
Adopt mol ratio be the BDO 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 in nitrogen atmosphere, and Stress control is at below 800Pa, and temperature controls at 180 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 catalyst tetraethyl titanate 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, described negative pressure refers to that absolute pressure is less than 300Pa, 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 60Pa, and reaction temperature controls at 275 DEG C, 3.5 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 PBT polyester section.
2. the preparation of core-skin composite fiber: using described fluorine-containing PBT as cortical material, PBT is as core material, carry out core-sheath spinning, the ratio of the cross-sectional area of cortex and sandwich layer is 3:5, spinning temperature is 279 DEG C, winding speed controls at 2900m/min, and the filament number of the fluorine-containing PBT-PBT core-skin composite fiber of gained is 10dtex.
Embodiment 4
1. the preparation method of fluorine-containing PBT polyester, is divided into esterification and polycondensation reaction two step.Concrete steps are:
Described esterification:
Adopt mol ratio be the BDO of 1.9:1 and tetrafluoro terephthalic acid (TPA) as raw material, add the zinc oxide of 0.04% 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 below 700Pa, and temperature controls at 170 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 sub-tin of catalyst acetic acid 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, described negative pressure refers to that absolute pressure is less than 300Pa, 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 60Pa, and reaction temperature controls at 275 DEG C, 3 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 PBT polyester section.
2. the preparation of core-skin composite fiber: using described fluorine-containing PBT as cortical material, PBT is as core material, carry out core-sheath spinning, the ratio of the cross-sectional area of cortex and sandwich layer is 5:5, spinning temperature is 275 DEG C, winding speed controls at 2800m/min, and the filament number of the fluorine-containing PBT-PBT core-skin composite fiber of gained is 5dtex.
Embodiment 5
1. the preparation method of fluorine-containing PBT polyester, is divided into esterification and polycondensation reaction two step.Concrete steps are:
Described esterification:
Adopt mol ratio be the BDO of 2.0:1 and tetrafluoro terephthalic acid (TPA) as raw material, add the manganese oxide of 0.05% 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 below 600Pa, and temperature controls at 160 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 dibutyltin diacetate of 0.05% of tetrafluoro terephthalic acid (TPA) weight and 0.05% of tetrafluoro terephthalic acid (TPA) weight is added in esterification products, polycondensation reaction is started under the condition of negative pressure, described negative pressure refers to that absolute pressure is less than 300Pa, temperature controls at 265 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 275 DEG C, 3 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 PBT polyester section.
2. the preparation of core-skin composite fiber: using described fluorine-containing PBT as cortical material, PBT is as core material, carry out core-sheath spinning, the ratio of the cross-sectional area of cortex and sandwich layer is 1:2, spinning temperature is 280 DEG C, winding speed controls at 3100m/min, and the filament number of the fluorine-containing PBT-PBT core-skin composite fiber of gained is 3dtex.
Claims (4)
1. a preparation method for fluorine-containing PBT-PBT core-skin composite fiber, is characterized in that: the cortical material of described fluorine-containing PBT-PBT core-skin composite fiber is fluorine-containing PBT, and core material is PBT; Described fluorine-containing PBT is polytetrafluoro mutual-phenenyl two acid bromide two alcohol ester, and its general structure is
Wherein n=70 ~ 150; The ratio of the described fluorine-containing cortex of PBT-PBT core-skin composite fiber and the sectional area of sandwich layer is 2 ~ 5:5;
The filament number of described fluorine-containing PBT-PBT core-skin composite fiber is 1 ~ 15dtex; The preparation method of described fluorine-containing PBT-PBT core-skin composite fiber, comprise the preparation method of fluorine-containing PBT and the preparation method of core-skin composite fiber, concrete steps are:
1) preparation method of described fluorine-containing PBT is divided into esterification and polycondensation reaction two step;
Described esterification:
Adopt tetrafluoro terephthalic acid (TPA) and BDO as raw material, add inhibitor, the addition of described inhibitor is 0.01% ~ 0.05% of described tetrafluoro terephthalic acid (TPA) weight; Carry out esterification after being made into uniform sizing material, obtain esterification products; Esterification is in nitrogen atmosphere, and Stress control is being less than absolute pressure 1KPa, and temperature is at 160 ~ 220 DEG C, and the time is 2 ~ 3 hours, and esterification water quantity of distillate reaches more than 90% of theoretical value for esterification terminal;
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:
In the described polycondensation reaction low vacuum stage, add catalyst and stabilizing agent in esterification products, under the condition of negative pressure, start polycondensation reaction, described negative pressure refers to below absolute pressure 500Pa, and temperature controls at 260 ~ 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 ~ 275 DEG C, 3 ~ 4 hours reaction time;
Obtained fluorine-containing PBT;
2) preparation method of described core-skin composite fiber is: using described fluorine-containing PBT as cortical material, and PBT, as core material, carries out core-sheath spinning, and spinning temperature is 270-280 DEG C, and winding speed controls at 2700 ~ 3200m/min.
2. the preparation method of a kind of fluorine-containing PBT-PBT core-skin composite fiber according to claim 1, is characterized in that, the mol ratio of described BDO and tetrafluoro terephthalic acid (TPA) is 1.4 ~ 2.0:1.
3. the preparation method of a kind of fluorine-containing PBT-PBT core-skin composite fiber according to claim 1, it is characterized in that, described catalyst is selected from the one in butyl titanate, tetraisopropyl titanate, tetraethyl titanate, stannous acetate, dibutyltin diacetate, and catalyst amount is 0.01% ~ 0.05% of described tetrafluoro terephthalic acid (TPA) weight.
4. the preparation method of a kind of fluorine-containing PBT-PBT core-skin composite 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 tetrafluoro terephthalic acid (TPA) weight.
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| CN113151927B (en) * | 2021-05-24 | 2023-01-20 | 太仓市洪宇新材料科技有限公司 | Colored fluorine-containing antibacterial parallel composite PBT (polybutylene terephthalate) fiber and preparation method thereof |
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Effective date of registration: 20210531 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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