CN113337909A - Creep-resistant polyester industrial yarn and preparation method thereof - Google Patents
Creep-resistant polyester industrial yarn and preparation method thereof Download PDFInfo
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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
- D01F6/78—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
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Abstract
The invention relates to a creep-resistant polyester industrial yarn and a preparation method thereof, which comprises
Polyesters A containing terminal groups
Melting, blending and spinning the polyester B with the end group, and balancing for a period of time at the temperature of 30-60 ℃ after spinning and forming to obtain the creep-resistant polyester industrial yarn; the molecular chain of the creep-resistant polyester industrial yarn comprises a polyester A molecular chain and a polyester B molecular chain, wherein one end of the polyester A molecular chain and one end of the polyester B molecular chain pass through
Description
Technical Field
The invention belongs to the technical field of polyester industrial yarns, and relates to a creep-resistant polyester industrial yarn and a preparation method thereof.
Background
The polyester industrial yarn is used as a fiber material which is most widely applied to industrial textiles, has good comprehensive properties in the aspects of strength, modulus, dimensional stability, impact resistance and the like, and is widely applied to the fields of aerospace, national defense and military industry, geotechnical protection, mine field and ocean resource development, transportation, industrial filtration, ropes and the like. However, for polyester industrial yarns used in certain specific applications, such as vehicle tires, conveyor belts, ropes, etc., to be subjected to stress loads for a long period of time, it is necessary to have good creep resistance to maintain the dimensional stability of the fibers during application. Therefore, the development of the polyester industrial yarn with excellent creep resistance can not only improve the safe service life, but also save resources.
The creep resistance of the polyester industrial yarn can be improved mainly by the following modes:
(1) improving the relative molecular mass of macromolecules; (2) increasing the degree of crystallographic orientation of the fiber; (3) crosslinking the macromolecules by adopting various modification methods; (4) the acting force between macromolecular chains is improved, and the acting force comprises introducing aromatic heterocyclic rings and polar groups into a main chain or forming an interpenetrating network structure and the like.
For the polyester industrial yarn, the polyester industrial yarn has the structural characteristic of high crystallization and high orientation, and the space for improving the creep resistance of the polyester industrial yarn is often concentrated on improving the acting force among macromolecular chains in the fiber. Patent CN201310479905.7 adopts fluorine-containing epoxy compound to cap polyester, and utilizes strong electronegativity of fluorine atoms to form hydrogen bonds between polyester molecular chains, so as to increase intermolecular acting force, and to some extent, to play a role in creep resistance. But compared with covalent bonds, the acting force of the hydrogen bonds is relatively weaker, the degree of the hydrogen bonds which can be formed in the system is lower, and the creep resistance of the fiber is improved to a limited extent. Patent CN202011607885.3 discloses a method for improving creep resistance of fiber by immersing a wound polyester industrial yarn in an aqueous solution containing a complexing agent to coordinate metal ions with 2- (4-pyridine) terephthalic acid, thereby increasing intermolecular forces and physical crosslinking points in the fiber and improving creep resistance of the fiber, wherein the complexing agent is difficult to diffuse into the fiber due to the high-crystalline and highly oriented dense structure of the polyester industrial yarn itself, and even if the polyester industrial yarn is processed at a certain temperature, the free volume in the amorphous region of the fiber is increased, the molecular chain segments are disoriented, which affects the maintenance of mechanical properties. In addition, a photosensitizer or a thermal initiator is adopted to realize the crosslinking of molecular chains in the fiber, and is also a method for increasing the creep resistance of the fiber, but the fiber cannot be heated and melted after being chemically crosslinked, so that the recycling of the fiber is influenced.
Therefore, it is important to develop a polyester industrial yarn having excellent creep resistance without affecting recycling and a method for preparing the same.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a creep-resistant polyester industrial yarn and a preparation method thereof.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the creep-resistant polyester industrial yarn comprises a polyester A molecular chain and a polyester B molecular chain, wherein one end of the polyester A molecular chain and one end of the polyester B molecular chain pass through
Connecting;
the creep elongation of the creep-resistant polyester industrial yarn is 0.7-1.1% and is far higher than the prior art level by performing a creep test on the creep-resistant polyester industrial yarn under the conditions of 25 ℃ of temperature, 65% of relative humidity, 30% of breaking strength of applied tension and 24 hours of time.
In the prior art, the creep-resistant polyester industrial yarn is mainly coordinated by hydrogen bonds or metal ions, so that the interaction among polyester macromolecular chains is increased, and the creep resistance of the yarn is improved, but the interaction force is far lower than the binding force of covalent bonds. The invention introduces the polyester macromolecule chain end
And
the two groups can be automatically dimerized at the temperature of 30-60 ℃ to form covalent bonds, so that covalent crosslinking is generated between macromolecular chains of polyester, strong interaction force is generated between the molecular chains, slippage of the molecular chains is reduced when load is applied, and creep resistance of fibers is improved; and under the condition of high temperature above 130 ℃,
can be depolymerized, has the characteristic of thermal reversible balance, and can not influence the thermoforming processing and recycling of the polyester industrial yarn.
As a preferred technical scheme:
the creep-resistant polyester industrial yarn has the polyester A molecular chain with the other end
Blocked by a radical, the other end of the molecular chain of polyester B
And (4) blocking the groups.
The creep-resistant polyester industrial yarn has the filament number of 3-10 dtex, the breaking strength of more than or equal to 8.0cN/dtex, the CV value of the breaking strength of less than or equal to 1.5%, the elongation at break of 10-20% and the CV value of the elongation at break of less than or equal to 4%.
The invention also provides a method for preparing the creep-resistant polyester industrial yarn, which comprises the following steps
Polyesters A containing terminal groups
And melting, blending and spinning the polyester B with the end group, and balancing (namely placing) for a period of time at the temperature of 30-60 ℃ after spinning and forming to obtain the creep-resistant polyester industrial yarn.
As a preferred technical scheme:
the method as described above, comprising
Polyesters A containing terminal groups
The mass ratio of the polyester B of the end groups is 0.8: 1-1: 0.8, and the mass ratio is set so that covalent crosslinking can be more easily generated between the end groups of the polyester A and the polyester B.
The method is carried out for 12-48 h.
In the method, the process parameters of the melt blending spinning are as follows: the melt temperature is 300-330 ℃, the temperature of the post heater is 300-330 ℃, the cooling blowing speed is 0.5-0.8 m/s, the blowing temperature is 20-30 ℃, the one-roll speed is 800-1000 m/min, and the hot roll drafting multiplying power is 4.5-6.5 times.
The method as described above, comprising
The end-group polyester A is obtained by reacting a virgin polyester with
Or
Prepared by reactive blending; comprises
The end-group polyester B is obtained by reacting a virgin polyester with
Or
Prepared by reactive blending;
all virgin polyesters have the chemical formula:
wherein E is1And E2Are all terminal hydroxyl groups, or E1And E2One is a terminal hydroxyl group, the other is a terminal carboxyl group, R is an aromatic ring, and n is the polymerization degree and has the value range of 130-180;
the number average molecular weight of all the raw polyesters is 25000 to 38000.
The method as described above, preparation of
In the case of the polyester A which is terminal,
or
The mass ratio of the raw polyester to the raw polyester is 10-20: 1000, the temperature of reactive blending is 275-285 ℃, the pressure is-0.05-0.08 MPa, and the time is 10-15 min.
The method as described above, preparation of
In the case of the polyester B which is terminal,
or
The mass ratio of the raw polyester to the raw polyester is 10-20: 1000, the temperature of reactive blending is 275-285 ℃, the pressure is-0.05-0.08 MPa, and the time is 10-15 min.
The above preparation comprises
Polyesters A or containing end groups
When the polyester B is used as the terminal group, the values of all parameters are set within a reasonable range, and are not too excessive, otherwise, the content of the terminal hydroxyl of the molecular chain of the primary polyester participating in reactive blending is low, the degree of covalent crosslinking inside the fiber is low, the improvement of the creep resistance effect is not facilitated, or excessive end-capping monomers are dispersed in the polyester in a free state, and the improvement of the fiber forming performance and the strength is influenced due to the existence of the low-molecular-weight substance.
The principle of the invention is as follows:
the invention will comprise
Polyesters A containing terminal groups
And (3) carrying out melt blending spinning on the polyester B with the end group, and then treating at the temperature of 30-60 ℃ to obtain the creep-resistant polyester industrial yarn with excellent comprehensive performance. Under the temperature condition of 30-60 ℃,
and
the two groups are automatically dimerized to form covalent bonds, which is beneficial to forming covalent bonds among polyester macromolecular chains in the amorphous region of the fiber, so that strong interaction is formed among the molecules, the slippage of the molecular chains under the action of an external load can be effectively reduced, and the creep resistance of the fiber is greatly improved; meanwhile, under the high temperature condition of more than 130 ℃,
can be depolymerized, has the characteristic of thermal reversibility, and cannot influence the thermal processing forming and recycling of the polyester industrial yarn. In addition, the linear structure of the polyester macromolecular chain is not damaged by the end capping means, the uniaxial stretching orientation in the fiber forming process is not influenced, and the covalent crosslinking of the molecular chain segments after forming can strengthen the interaction of the molecular chain in the amorphous area, thereby being beneficial to the maintenance of the fiber strength.
Has the advantages that:
(1) according to the creep-resistant polyester industrial yarn, covalent bonds can be formed among molecular chains after the fibers are subjected to heat treatment at 30-60 ℃, the fibers can be subjected to dimerization at a high temperature of more than 130 ℃, and the creep resistance of the fibers is greatly improved on the premise of not influencing the spinning forming processing and recycling of the fibers;
(2) the preparation method of the creep-resistant polyester industrial yarn adopts reactive blending and melt blending extrusion spinning, has simple process, low cost, easy large-scale popularization, good quality and durability stability of fiber products and long safe service life.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Example 1
A preparation method of creep-resistant polyester industrial yarn comprises the following specific steps:
(1) will be provided with
And the chemical structural formula is
（n=130）The raw polyester is prepared by reactive blending according to the mass ratio of 10:1000
A polyester A with terminal groups; wherein the reactive blending temperature is 275 ℃, the pressure is-0.05 MPa, and the time is 10 min;
(2) will be provided with
And the chemical structural formula is
The raw polyester (n = 130) is prepared by the reactive blending according to the mass ratio of 10:1000
A polyester B which is terminal; wherein the reactive blending temperature is 275 ℃, the pressure is-0.05 MPa, and the time is 15 min;
(3) the compound prepared in the step (1) contains
Polyester A with end group and the polyester A prepared in the step (2) containing
Carrying out melt blending spinning on the polyester B with the end group according to the mass ratio of 1:1, and balancing for 48 hours at the temperature of 30 ℃ after spinning forming to obtain the creep-resistant polyester industrial yarn; wherein the technological parameters of the melt blending spinning are as follows: the melt temperature is 300 ℃, the temperature of a post heater is 300 ℃, the cooling blowing speed is 0.5m/s, the blowing temperature is 20 ℃, the one-roll speed is 800m/min, and the hot roll drafting multiplying power is 4.5 times.
The finally prepared creep-resistant polyester industrial yarn comprises a polyester A molecular chain and a polyester B molecular chain, wherein one end of the polyester A molecular chain and one end of the polyester B molecular chain pass through
The other end of the polyester A molecular chain is connected with
Blocked by a radical, the other end of the molecular chain of polyester B
End-capping with a group; the filament number of the creep-resistant polyester industrial yarn is 10dtex, the breaking strength is 8.0cN/dtex, the CV value of the breaking strength is 1.5%, the elongation at break is 20%, and the CV value of the elongation at break is 4%; the creep elongation of the creep-resistant polyester industrial yarn was 1.1% by conducting the creep test at a temperature of 25 ℃, a relative humidity of 65%, an applied tension of 30% of the breaking strength and a time of 24 hours.
Example 2
A preparation method of creep-resistant polyester industrial yarn comprises the following specific steps:
(1) will be provided with
And the chemical structural formula is
The raw polyester (n = 140) is prepared by the reactive blending according to the mass ratio of 20:1000
A polyester A with terminal groups; wherein the reactive blending temperature is 280 ℃, the pressure is-0.05 MPa, and the time is 10 min;
(2) will be provided with
And the chemical structural formula is
The raw polyester (n = 140) is prepared by the reactive blending according to the mass ratio of 20:1000
A polyester B which is terminal; wherein the reactive blending temperature is 280 ℃, the pressure is-0.05 MPa, and the time is15min；
(3) The compound prepared in the step (1) contains
Polyester A with end group and the polyester A prepared in the step (2) containing
Carrying out melt blending spinning on the polyester B with the end group according to the mass ratio of 1:1, and balancing for 12 hours at the temperature of 60 ℃ after spinning forming to obtain the creep-resistant polyester industrial yarn; wherein the technological parameters of the melt blending spinning are as follows: the melt temperature is 300 ℃, the temperature of a post heater is 300 ℃, the cooling blowing speed is 0.5m/s, the blowing temperature is 20 ℃, the one-roll speed is 800m/min, and the hot roll drafting multiplying power is 5.8 times.
The finally prepared creep-resistant polyester industrial yarn comprises a polyester A molecular chain and a polyester B molecular chain, wherein one end of the polyester A molecular chain and one end of the polyester B molecular chain pass through
The other end of the polyester A molecular chain is connected with
Blocked by a radical, the other end of the molecular chain of polyester B
End-capping with a group; the filament number of the creep-resistant polyester industrial yarn is 7dtex, the breaking strength is 8.1cN/dtex, the CV value of the breaking strength is 1.4%, the elongation at break is 18%, and the CV value of the elongation at break is 3.8%; the creep elongation of the creep-resistant polyester industrial yarn was 0.9% by conducting the creep test at a temperature of 25 ℃, a relative humidity of 65%, an applied tension of 30% of the breaking strength and a time of 24 hours.
Example 3
A preparation method of creep-resistant polyester industrial yarn comprises the following specific steps:
(1) will be provided with
And the chemical structural formula is
The raw polyester (n = 150) is prepared by reactive blending according to the mass ratio of 15:1000
A polyester A with terminal groups; wherein the reactive blending temperature is 280 ℃, the pressure is-0.06 MPa, and the time is 12 min;
(2) will be provided with
And the chemical structural formula is
The raw polyester (n = 150) is prepared by reactive blending according to the mass ratio of 15:1000
A polyester B which is terminal; wherein the reactive blending temperature is 280 ℃, the pressure is-0.06 MPa, and the time is 12 min;
(3) the compound prepared in the step (1) contains
Polyester A with end group and the polyester A prepared in the step (2) containing
Carrying out melt blending spinning on the polyester B with the end group according to the mass ratio of 1:1, and balancing for 24 hours at the temperature of 50 ℃ after spinning forming to obtain the creep-resistant polyester industrial yarn; wherein the technological parameters of the melt blending spinning are as follows: the melt temperature is 310 ℃, the temperature of a post heater is 310 ℃, the cooling blowing speed is 0.5m/s, the blowing temperature is 25 ℃, the one-roll speed is 900m/min, and the hot-roll drawing magnification is 6 times.
The finally prepared creep-resistant polyester industrial yarn comprises a polyester A molecular chain and a polyester B molecular chain, wherein one end of the polyester A molecular chain and one end of the polyester B molecular chain pass through
The other end of the polyester A molecular chain is connected with
Blocked by a radical, the other end of the molecular chain of polyester B
End-capping with a group; the filament number of the creep-resistant polyester industrial yarn is 6dtex, the breaking strength is 8.2cN/dtex, the CV value of the breaking strength is 1.3%, the elongation at break is 16%, and the CV value of the elongation at break is 3.6%; the creep elongation of the creep-resistant polyester industrial yarn was 0.86% when the creep test was performed at a temperature of 25 ℃, a relative humidity of 65%, an applied tension of 30% of the breaking strength, and a time of 24 hours.
Example 4
A preparation method of creep-resistant polyester industrial yarn comprises the following specific steps:
(1) will be provided with
And the chemical structural formula is
The raw polyester (n = 180) is prepared by the reactive blending according to the mass ratio of 10:1000
A polyester A with terminal groups; wherein the reactive blending temperature is 280 ℃, the pressure is-0.08 MPa, and the time is 12 min;
(2) will be provided with
And the chemical structural formula is
The raw polyester (n = 180) is prepared by the reactive blending according to the mass ratio of 10:1000
A polyester B which is terminal; wherein the reactive blending temperature is 280 ℃, the pressure is-0.08 MPa, and the time is 12 min;
(3) the compound prepared in the step (1) contains
Polyester A with end group and the polyester A prepared in the step (2) containing
Carrying out melt blending spinning on the polyester B with the end group according to the mass ratio of 0.8:1, and balancing for 24 hours at the temperature of 50 ℃ after spinning forming to obtain the creep-resistant polyester industrial yarn; wherein the technological parameters of the melt blending spinning are as follows: the melt temperature is 330 ℃, the temperature of a post heater is 330 ℃, the cooling blowing speed is 0.8m/s, the blowing temperature is 25 ℃, the one-roll speed is 900m/min, and the hot-roll drawing magnification is 5.4 times.
The finally prepared creep-resistant polyester industrial yarn comprises a polyester A molecular chain and a polyester B molecular chain, wherein one end of the polyester A molecular chain and one end of the polyester B molecular chain pass through
The other end of the polyester A molecular chain is connected with
Blocked by a radical, the other end of the molecular chain of polyester B
End-capping with a group; the filament number of the creep-resistant polyester industrial yarn is 5dtex, the breaking strength is 8.1cN/dtex, the CV value of the breaking strength is 1.4%, the elongation at break is 14%, and the CV value of the elongation at break is 3.5%; the creep elongation of the creep-resistant polyester industrial yarn was 0.83% by conducting the creep test at a temperature of 25 ℃, a relative humidity of 65%, an applied tension of 30% of the breaking strength and a time of 24 hours.
Example 5
A preparation method of creep-resistant polyester industrial yarn comprises the following specific steps:
(1) will be provided with
And the chemical structural formula is
The raw polyester (n = 160) is prepared by the reactive blending according to the mass ratio of 20:1000
A polyester A with terminal groups; wherein the reactive blending temperature is 285 ℃, the pressure is-0.08 MPa, and the time is 15 min;
(2) will be provided with
And the chemical structural formula is
The raw polyester (n = 160) is prepared by the reactive blending according to the mass ratio of 20:1000
A polyester B which is terminal; wherein the reactive blending temperature is 285 ℃, the pressure is-0.08 MPa, and the time is 10 min;
(3) the compound prepared in the step (1) contains
Polyester A with end group and the polyester A prepared in the step (2) containing
Carrying out melt blending spinning on the polyester B with the end group according to the mass ratio of 1:0.8, and balancing for 24 hours at the temperature of 50 ℃ after spinning forming to obtain the creep-resistant polyester industrial yarn; wherein the technological parameters of the melt blending spinning are as follows: the melt temperature is 320 ℃, the temperature of a post heater is 320 ℃, the cooling blowing speed is 0.8m/s, the blowing temperature is 30 ℃, the one-roll speed is 1000m/min, and the hot roll drafting multiplying power is 6.2 times.
The finally prepared creep-resistant polyester industrial yarn comprises a polyester A molecular chain and a polyester B molecular chain, wherein one end of the polyester A molecular chain and one end of the polyester B molecular chain pass through
The other end of the polyester A molecular chain is connected with
Blocked by a radical, the other end of the molecular chain of polyester B
End-capping with a group; the filament number of the creep-resistant polyester industrial yarn is 4dtex, the breaking strength is 8.3cN/dtex, the CV value of the breaking strength is 1.3%, the elongation at break is 12%, and the CV value of the elongation at break is 3.2%; the creep elongation of the creep-resistant polyester industrial yarn was 0.8% by conducting the creep test at a temperature of 25 ℃, a relative humidity of 65%, an applied tension of 30% of the breaking strength and a time of 24 hours.
Example 6
A preparation method of creep-resistant polyester industrial yarn comprises the following specific steps:
(1) will be provided with
And the chemical structural formula is
The raw polyester (n = 150) is prepared by reactive blending according to the mass ratio of 15:1000
A polyester A with terminal groups; wherein the reactive blending temperature is 285 ℃, the pressure is-0.08 MPa, and the time is 15 min;
(2) will be provided with
And the chemical structural formula is
The raw polyester (n = 150) is prepared by reactive blending according to the mass ratio of 15:1000
A polyester B which is terminal; wherein the reactive blending temperature is 285 ℃, the pressure is-0.08 MPa, and the time is 10 min;
(3) the compound prepared in the step (1) contains
Polyester A with end group and the polyester A prepared in the step (2) containing
Carrying out melt blending spinning on the polyester B with the end group according to the mass ratio of 1:1, and balancing for 24 hours at the temperature of 50 ℃ after spinning forming to obtain the creep-resistant polyester industrial yarn; wherein the technological parameters of the melt blending spinning are as follows: the melt temperature is 315 ℃, the temperature of a post heater is 315 ℃, the cooling blowing speed is 0.6m/s, the blowing temperature is 30 ℃, the one-roll speed is 1000m/min, and the hot-roll drawing magnification is 6.5 times.
The finally prepared creep-resistant polyester industrial yarn comprises a polyester A molecular chain and a polyester B molecular chain, wherein one end of the polyester A molecular chain and one end of the polyester B molecular chain pass through
The other end of the polyester A molecular chain is connected with
Blocked by a radical, the other end of the molecular chain of polyester B
End-capping with a group; the filament number of the creep-resistant polyester industrial yarn is 3dtex, the breaking strength is 8.4cN/dtex, the CV value of the breaking strength is 1.3%, the elongation at break is 10%, and the CV value of the elongation at break is 3.3%; creep test was conducted at 25 deg.C, 65% relative humidity, 30% applied tensile strength at break and 24 hours timeThe creep elongation of the obtained creep-resistant polyester industrial yarn was 0.7%.
Claims (10)
1. A creep-resistant polyester industrial yarn is characterized in that: the molecular chain comprises a polyester A molecular chain and a polyester B molecular chain, wherein one end of the polyester A molecular chain and one end of the polyester B molecular chain pass through
Connecting;
the creep elongation of the creep-resistant polyester industrial yarn is 0.7-1.1% by performing a creep test under the conditions that the temperature is 25 ℃, the relative humidity is 65%, the applied tension is 30% of the breaking strength and the time is 24 hours.
2. The creep-resistant polyester industrial yarn as claimed in claim 1, wherein the other end of the molecular chain of polyester A is composed of
Blocked by a radical, the other end of the molecular chain of polyester B
And (4) blocking the groups.
3. The creep-resistant polyester industrial yarn as claimed in claim 1, wherein the filament number of the creep-resistant polyester industrial yarn is 3-10 dtex, the breaking strength is not less than 8.0cN/dtex, the CV value of the breaking strength is not more than 1.5%, the elongation at break is 10-20%, and the CV value of the elongation at break is not more than 4%.
4. A method for preparing the creep-resistant polyester industrial yarn as claimed in any one of claims 1 to 3, wherein: will contain
Polyesters A containing terminal groups
And melting, blending and spinning the polyester B with the end group, and balancing for a period of time at the temperature of 30-60 ℃ after spinning and forming to obtain the creep-resistant polyester industrial yarn.
5. The method of claim 4, comprising
Polyesters A containing terminal groups
The mass ratio of the polyester B of the end group is 0.8: 1-1: 0.8.
6. The method according to claim 4, wherein the period of time is 12 to 48 hours.
7. The method of claim 4, wherein the process parameters of the melt blending spinning are as follows: the melt temperature is 300-330 ℃, the temperature of the post heater is 300-330 ℃, the cooling blowing speed is 0.5-0.8 m/s, the blowing temperature is 20-30 ℃, the one-roll speed is 800-1000 m/min, and the hot roll drafting multiplying power is 4.5-6.5 times.
8. The method of claim 4, comprising
The end-group polyester A is obtained by reacting a virgin polyester with
Or
Prepared by reactive blending; comprises
End-group polyestersB is the reaction of a virgin polyester with
Or
Prepared by reactive blending;
all virgin polyesters have the chemical formula:
wherein E is1And E2Are all terminal hydroxyl groups, or E1And E2One is a terminal hydroxyl group, the other is a terminal carboxyl group, R is an aromatic ring, and n is the polymerization degree and has the value range of 130-180;
the number average molecular weight of all the raw polyesters is 25000 to 38000.
9. The method of claim 8, wherein the preparation comprises
In the case of the polyester A which is terminal,
or
The mass ratio of the raw polyester to the raw polyester is 10-20: 1000, the temperature of reactive blending is 275-285 ℃, the pressure is-0.05-0.08 MPa, and the time is 10-15 min.
10. The method of claim 8, wherein the preparation comprises
In the case of the polyester B which is terminal,
or
The mass ratio of the raw polyester to the raw polyester is 10-20: 1000, the temperature of reactive blending is 275-285 ℃, the pressure is-0.05-0.08 MPa, and the time is 10-15 min.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115305596A (en) * | 2022-07-21 | 2022-11-08 | 山东华纶新材料有限公司 | Marine creep-resistant high-strength polyester fiber and preparation method and application thereof |
| CN115787132A (en) * | 2022-09-15 | 2023-03-14 | 江苏恒力化纤股份有限公司 | Preparation method of creep-resistant polyester industrial yarn |
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