CN117071107B - Polyester-nylon sheath-core type industrial yarn and preparation method thereof - Google Patents
Polyester-nylon sheath-core type industrial yarn and preparation method thereof Download PDFInfo
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- CN117071107B CN117071107B CN202311324322.7A CN202311324322A CN117071107B CN 117071107 B CN117071107 B CN 117071107B CN 202311324322 A CN202311324322 A CN 202311324322A CN 117071107 B CN117071107 B CN 117071107B
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- 239000004677 Nylon Substances 0.000 title claims abstract description 53
- 229920001778 nylon Polymers 0.000 title claims abstract description 53
- 238000002360 preparation method Methods 0.000 title abstract description 20
- 229920006147 copolyamide elastomer Polymers 0.000 claims abstract description 157
- 239000011162 core material Substances 0.000 claims abstract description 97
- 239000000463 material Substances 0.000 claims abstract description 97
- 239000004952 Polyamide Substances 0.000 claims abstract description 95
- 229920002647 polyamide Polymers 0.000 claims abstract description 95
- 229920000728 polyester Polymers 0.000 claims abstract description 89
- 239000012792 core layer Substances 0.000 claims abstract description 83
- 238000009987 spinning Methods 0.000 claims abstract description 48
- 238000010894 electron beam technology Methods 0.000 claims abstract description 27
- 238000002074 melt spinning Methods 0.000 claims abstract description 20
- 239000002131 composite material Substances 0.000 claims abstract description 18
- 239000000835 fiber Substances 0.000 claims abstract description 18
- 239000010410 layer Substances 0.000 claims description 55
- 238000001125 extrusion Methods 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 14
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 9
- 238000009998 heat setting Methods 0.000 claims description 9
- -1 polyethylene terephthalate Polymers 0.000 claims description 9
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 9
- 238000010583 slow cooling Methods 0.000 claims description 9
- 229920002302 Nylon 6,6 Polymers 0.000 claims description 6
- 229920002292 Nylon 6 Polymers 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000004043 dyeing Methods 0.000 abstract description 4
- 239000008358 core component Substances 0.000 abstract description 2
- 229920001577 copolymer Polymers 0.000 description 14
- 238000002156 mixing Methods 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 11
- 239000000306 component Substances 0.000 description 11
- 239000002994 raw material Substances 0.000 description 8
- 229920006052 Chinlon® Polymers 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 3
- 229920004933 Terylene® Polymers 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000000980 acid dye Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010382 chemical cross-linking Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000000986 disperse dye Substances 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 229920006149 polyester-amide block copolymer Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/14—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyester as constituent
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/08—Melt spinning methods
- D01D5/084—Heating filaments, threads or the like, leaving the spinnerettes
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/08—Melt spinning methods
- D01D5/098—Melt spinning methods with simultaneous stretching
-
- 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
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/10—Other agents for modifying properties
-
- 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
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/12—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyamide as constituent
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Multicomponent Fibers (AREA)
Abstract
The invention relates to a polyester nylon sheath-core type industrial yarn and a preparation method thereof, wherein the polyester nylon sheath-core type industrial yarn has a sheath-core structure, a sheath base material is polyamide, a core layer base material is polyester, and a polyester-polyamide block copolymer I containing unsaturated groups and a polyester-polyamide block copolymer II containing unsaturated groups are dispersed at the interface of the sheath and the core layer; the preparation method comprises the following steps: and carrying out melt spinning forming on the sheath material and the core material through a parallel composite spinning assembly to obtain fibers, then carrying out electron beam irradiation and then carrying out hot drawing to obtain the polyester-nylon sheath-core industrial yarn. The polyester-nylon sheath-core type industrial yarn overcomes the problem of poor compatibility of polyester-nylon sheath-core components, and remarkably improves the strength of the polyester-nylon sheath-core type industrial yarn; the preparation method provided by the invention is simple, low in cost and easy to popularize in a large scale, and the polyester sheath-core type industrial yarn has excellent performance indexes in dyeing, wear resistance, dimensional stability, strength and the like.
Description
Technical Field
The invention belongs to the field of industrial yarns, and relates to a polyester-nylon skin-core industrial yarn and a preparation method thereof.
Background
The polyester industrial yarn has excellent stability in strength, modulus, size and other performances, so that the polyester industrial yarn has wide application prospect in the fields of automobile tire cord, safety belts, geogrids and the like. However, polyester industrial yarns, because of their high crystalline and highly oriented nature and because of the lack of groups from which the dye can be directly dyed, can only be dyed with high temperature, high pressure disperse dyes when dyeing is required in certain subsequent applications, but can result in serious loss of strength of the fiber.
In contrast, nylon industrial yarn has the advantages of high breaking strength, light weight, excellent wear resistance and fatigue resistance, can be colored by acid dye, and has low dyeing difficulty, but the nylon industrial yarn has poor dimensional stability under high temperature conditions.
Therefore, the advantages of terylene and chinlon are combined, and the preparation of the terylene-chinlon composite fiber realizes the advantages and the disadvantages, and is a research direction of hot spots.
Because the compatibility between terylene and chinlon is poor, the bonding force of the interface is weak in the composite spinning process, and the problems of phase separation, interface deformation and the like are easy to occur. Although the sheath-core composite structure can be adopted to stabilize the structure of the polyester/nylon composite fiber due to the space limitation to a certain extent, in the spinning process, the two components are easy to generate asynchronous deformation due to weaker interface binding force, so that the interface deformation is caused.
In order to improve the interfacial compatibility of polyester/nylon sheath-core composite fibers, patent CN108642598B discloses a polyester/nylon sheath-core type industrial yarn and a preparation method thereof, wherein a polyester-polyamide block copolymer is added into a composite fiber core layer, heterogeneous flow of the polyester-polyamide block copolymer is utilized to enrich the surface layer of the core layer, molecular directional arrangement occurs, polyamide chain segments are outwards arranged into the skin layer, and the polyester chain segments are arranged towards the core layer so as to increase the interfacial effect between two components. Although the polyester-polyamide segmented copolymer has a certain effect, discontinuous polyester and polyamide microdomains still exist at the interface joint by virtue of the enrichment of the polyester-polyamide segmented copolymer on the surface of the core layer and the directional arrangement of the thermodynamic layer, and the improvement of the interface binding force of the two components is hindered to a certain extent, so that the strength improvement of the polyester-polyamide sheath-core composite industrial yarn is influenced.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a preparation method of polyester-nylon sheath-core type industrial yarn.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a polyester-nylon sheath-core type industrial yarn has a sheath-core structure, wherein a sheath substrate is polyamide, a core substrate is polyester, and a polyester-polyamide block copolymer I containing unsaturated groups and a polyester-polyamide block copolymer II containing unsaturated groups are dispersed at the interface of a sheath layer and a core layer;
the polyamide segment of the polyester-polyamide block copolymer I containing unsaturated groups is inserted into the skin layer, and the polyester segment containing unsaturated groups is inserted into the core layer;
the polyamide segment of the polyester-polyamide block copolymer II containing unsaturated groups is inserted into the skin layer, and the polyester segment containing unsaturated groups is inserted into the core layer;
covalent bonds are formed between the unsaturated group-containing polyester-polyamide block copolymer I and the unsaturated group-containing polyester-polyamide block copolymer II.
As a preferable technical scheme:
the polyester-nylon sheath-core type industrial yarn has the advantages that the single filament number of the polyester-nylon sheath-core type industrial yarn is more than 3dtex, and the tensile breaking strength is more than 8.2 cN/dtex.
The invention also provides a method for preparing the polyester-nylon skin-core type industrial yarn, which comprises the steps of carrying out melt spinning forming on the skin material and the core material through parallel composite spinning components to obtain fibers, carrying out electron beam irradiation, and carrying out hot drawing to obtain the polyester-nylon skin-core type industrial yarn;
the skin material is a mixture of polyamide and polyester-polyamide block copolymer II containing unsaturated groups, and the zero-cut viscosity of the polyester-polyamide block copolymer II containing unsaturated groups is larger than that of polyamide at the extrusion temperature;
the core layer material is a mixture of polyester and polyester-polyamide block copolymer I containing unsaturated groups, and the zero-cut viscosity of the polyester-polyamide block copolymer I containing unsaturated groups at the extrusion temperature is smaller than that of the polyester;
after electron beam irradiation, the unsaturated group-containing polyester-polyamide block copolymer II is chemically crosslinked with the unsaturated group-containing polyester-polyamide block copolymer I.
When the sheath material and the core material are formed by melt spinning through the parallel composite spinning assembly, the zero-shear viscosity of the polyester-polyamide block copolymer II containing unsaturated groups is larger than that of polyamide at the extrusion temperature, so that the polyester-polyamide block copolymer II containing unsaturated groups migrates to the inner side of the sheath, and the zero-shear viscosity of the polyester-polyamide block copolymer I containing unsaturated groups is smaller than that of the polyester at the extrusion temperature, so that the polyester-polyamide block copolymer I containing unsaturated groups migrates to the outer side of the core, and the polyester-polyamide block copolymer I containing unsaturated groups and the polyester-polyamide block copolymer II containing unsaturated groups are enriched at the interface between the sheath and the core;
the polyester-polyamide block copolymer II containing unsaturated groups and the polyester-polyamide block copolymer I containing unsaturated groups, which are enriched at the interface of the skin layer and the core layer, undergo microphase separation due to thermodynamic incompatibility with the matrix in which they are located, and the polyamide segments of the polyester-polyamide block copolymer I containing unsaturated groups are arranged outwards to be inserted into the skin layer, the polyester segments containing unsaturated groups remain in the core layer, the polyamide segments of the polyester-polyamide block copolymer II containing unsaturated groups remain in the skin layer, and the polyester segments containing unsaturated groups are arranged inwards to be inserted into the core layer, due to the orientation of macromolecular chains;
when the electron beam is irradiated, the electron beam penetrating power is stronger, and the electron beam can reach the interface of the skin layer and the core layer, so that the polyester-polyamide segmented copolymer II containing unsaturated groups and the polyester-polyamide segmented copolymer I containing unsaturated groups are subjected to chemical crosslinking, and the strength of the polyester/nylon skin-core type industrial yarn is remarkably improved.
As a preferable technical scheme:
in the method, the structural general formulas of the polyester-polyamide block copolymer I containing unsaturated groups and the polyester-polyamide block copolymer II containing unsaturated groups are respectively and independently selected from A-B and A-C, the A segment is a polyester segment containing unsaturated groups, and the structural formula of the A segment is as follows:
；
the structural formula of the section B is as follows:
；
the structural formula of the section C is as follows:
wherein a is 2, 3 or 4, b is 4, 5 or 6, c is 5, 6, 7, 9, 10, 12 or 13, x is 5 to 12, y is 6 to 15, and z is 5 to 10;
in the polyester-polyamide block copolymer I containing unsaturated groups, the intrinsic viscosity of the section A is 0.3-0.5 dL/g, the relative viscosity of the section B is 1.5-2.0, and the relative viscosity of the section C is 1.4-2.0;
in the polyester-polyamide block copolymer II containing unsaturated groups, the intrinsic viscosity of the section A is 0.4-0.6 dL/g, the relative viscosity of the section B is 2.0-2.4, and the relative viscosity of the section C is 2.0-2.4;
the dose of the electron beam irradiation is 18-150 kGy, the irradiation dose rate is 0.1-0.5 kGy/s, and the irradiation time is 3-5 min.
According to the method, the content of the polyester-polyamide block copolymer II containing unsaturated groups in the skin layer material is 2-2.5% of the mass of polyamide; in the core layer material, the content of the polyester-polyamide block copolymer I containing unsaturated groups is 2-2.5% of the mass of polyester, if the content of the polyester-polyamide block copolymer is too high, the crystallization orientation of the skin layer and the core layer is affected, the strength of the fiber material is not improved, but the content of the polyester-polyamide block copolymer is too low, the enrichment content at the skin-core interface is too low, and therefore the interface binding force is low.
In the method, in the skin material, the polyamide is polycaprolactam or polyhexamethylene adipamide, the relative viscosity of the polyamide is 2.8-3.5, the number average molecular weight of the polyester-polyamide block copolymer II containing unsaturated groups is 30000-45000 g/mol, and the zero-cut viscosity of the polyester-polyamide block copolymer II containing unsaturated groups is 250-350 Pa.s larger than the zero-cut viscosity of the polyamide at the extrusion temperature;
in the core layer material, the polyester is polyethylene terephthalate, the intrinsic viscosity of the polyester is 0.9-1.2 dL/g, the number average molecular weight of the polyester-polyamide block copolymer I containing unsaturated groups is 15000-25000 g/mol, and the zero-cut viscosity of the polyester-polyamide block copolymer I containing unsaturated groups is 250-350 Pa.s smaller than the zero-cut viscosity of the polyester at the extrusion temperature.
According to the method, the mass ratio of the sheath material to the core layer material is 30-40:70-60, if the mass of the sheath is too low, the sheath is broken easily in the spinning process, part of the core layer structure can leak out, the stability and the spinning quality of spinning are affected, but the mass of the sheath is too high, and the production cost of raw materials is increased.
The process parameters of melt spinning forming include, as described above: the spinning temperature of the core layer material is 300-320 ℃, the spinning temperature of the skin layer material is 275-285 ℃, the slow cooling temperature is 250-260 ℃, the cooling temperature is 18-28 ℃, the hot drawing temperature is 150-180 ℃, the multiplying power of the hot drawing is 4-7 times, and the heat setting temperature is 180-190 ℃.
The beneficial effects are that:
(1) According to the polyester-polyamide sheath-core type industrial yarn, the polyester-polyamide segmented copolymer containing unsaturated groups is introduced into the sheath layer and the core layer, the polyester-polyamide segmented copolymer is enriched at the sheath-core interface by utilizing the difference of zero-cutting viscosity of the polyester-polyamide segmented copolymer, and covalent bonds are formed by electron beam irradiation crosslinking, so that the interface binding force between the sheath-core layers is greatly improved, the problem of poor compatibility of polyester-polyamide sheath-core components is solved, and the strength of the polyester-polyamide sheath-core type industrial yarn is remarkably improved.
(2) The preparation method of the polyester nylon sheath-core type industrial yarn has the advantages of simple process, low cost and easy large-scale popularization, and the polyester sheath-core type industrial yarn has excellent performance indexes in dyeing, wear resistance, dimensional stability, strength and the like.
Detailed Description
The invention is further described below in conjunction with the detailed description. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. Further, it is understood that various changes and modifications may be made by those skilled in the art after reading the teachings of the present invention, and such equivalents are intended to fall within the scope of the claims appended hereto.
The structural formula of the three A, B, C segments of the unsaturated group-containing polyester-polyamide block copolymer I and the unsaturated group-containing polyester-polyamide block copolymer II in the examples is as follows:
the structural formula of the section A is as follows:；
the structural formula of the section B is as follows:；
the structural formula of the section C is as follows:；
wherein a is 2, 3 or 4, b is 4, 5 or 6, c is 5, 6, 7, 9, 10, 12 or 13, x is 5 to 12, y is 6 to 15, and z is 5 to 10;
the following is a test method for performance in the examples:
zero shear viscosity: measured according to ASTM D3835-2002;
single filament fineness: measured according to GB/T14343-2008 standard;
tensile breaking strength: measured according to GB/T14344-1993 standard.
Example 1
A preparation method of polyester-nylon sheath-core type industrial yarn comprises the following steps:
(1) Preparing raw materials;
polyamide: polycaprolactam with a relative viscosity of 2.8;
unsaturated group-containing polyester-polyamide block copolymer II: the structural general formula is A-B, wherein a is 2, x is 5, y is 6, and the number average molecular weight is 30000g/mol;
and (3) polyester: polyethylene terephthalate having an intrinsic viscosity of 0.9dL/g;
unsaturated group-containing polyester-polyamide block copolymer I: the structural general formula is A-C, wherein a is 2, x is 5, b is 4, C is 5, z is 5, and the number average molecular weight is 15000g/mol;
(2) Preparing a skin material;
uniformly mixing polyamide and a polyester-polyamide segmented copolymer II containing unsaturated groups to obtain a skin layer material; wherein the content of the unsaturated group-containing polyester-polyamide block copolymer II is 2% of the mass of the polyamide;
(3) Preparing a core layer material;
uniformly mixing polyester and a polyester-polyamide block copolymer I containing unsaturated groups to obtain a core layer material; wherein the content of the unsaturated group-containing polyester-polyamide block copolymer I is 2% of the mass of the polyester;
(4) After melt spinning and forming are carried out on a sheath material and a core material with the mass ratio of 30:70 through a parallel composite spinning assembly to obtain fibers, electron beam irradiation is carried out first, and then thermal drafting is carried out, so that the polyester-nylon sheath-core industrial yarn is obtained;
wherein the zero-cut viscosity of the polyester-polyamide block copolymer II containing an unsaturated group at the extrusion temperature (i.e., the spinning temperature of the sheath material) is 250 Pa.s greater than the zero-cut viscosity of the polyamide, and the zero-cut viscosity of the polyester-polyamide block copolymer I containing an unsaturated group at the extrusion temperature (i.e., the spinning temperature of the core material) is 250 Pa.s less than the zero-cut viscosity of the polyester; the dose of electron beam irradiation is 18kGy, the irradiation dose rate is 0.1kGy/s, and the irradiation time is 3min;
the technological parameters of melt spinning forming are as follows: the spinning temperature of the core layer material is 300 ℃, the spinning temperature of the skin layer material is 275 ℃, the slow cooling temperature is 250 ℃, the cooling temperature is 28 ℃, the hot drawing temperature is 150 ℃, the multiplying power of hot drawing is 4 times, and the heat setting temperature is 180 ℃.
The filament number of the finally prepared polyester-nylon sheath-core type industrial yarn is 5dtex, the tensile breaking strength is 8.2cN/dtex, the structure is a sheath-core structure, the sheath base material is polyamide, the core base material is polyester, and the polyester-polyamide block copolymer I containing unsaturated groups and the polyester-polyamide block copolymer II containing unsaturated groups are dispersed at the interface of the sheath and the core;
the polyamide segment of the polyester-polyamide block copolymer I containing unsaturated groups is inserted into the skin layer, and the polyester segment containing unsaturated groups is inserted into the core layer;
the polyamide segment of the polyester-polyamide block copolymer II containing unsaturated groups is inserted into the skin layer, and the polyester segment containing unsaturated groups is inserted into the core layer;
covalent bonds are formed between the unsaturated group-containing polyester-polyamide block copolymer I and the unsaturated group-containing polyester-polyamide block copolymer II.
Comparative example 1
The preparation method of the polyester-nylon sheath-core type industrial yarn is basically the same as that of the embodiment 1, and the difference is that: step (1) does not prepare the unsaturated group-containing polyester-polyamide block copolymer II, and the skin layer material in step (2) is composed of only polyamide; comparative example 1 corresponds to the substitution of the unsaturated group-containing polyester-polyamide block copolymer II of example 1 with an equal mass of the polyamide of example 1.
The tensile breaking strength of the finally prepared polyester-nylon sheath-core type industrial yarn is 7.4cN/dtex.
As can be seen from comparing example 1 with comparative example 1, in comparative example 1, the crosslinking structure between the skin layer and the core layer component cannot be realized without adding the component containing the unsaturated group, and the interfacial bonding force between the two components is affected to a certain extent, and when stretching, asynchronous deformation is generated between the skin layer and the core layer component, so that the skin layer and the core layer component are not broken at the same time, and the breaking strength of the fiber is reduced.
Comparative example 2
The preparation method of the polyester-nylon sheath-core type industrial yarn is basically the same as that of the embodiment 1, and the difference is that: step (1) does not prepare the unsaturated group-containing polyester-polyamide block copolymer I, and the core layer material in step (3) is composed of only polyester; comparative example 2 corresponds to the substitution of the polyester-polyamide block copolymer I containing unsaturated groups of example 1 with an equal mass of the polyester of example 1.
The tensile breaking strength of the finally prepared polyester-nylon sheath-core type industrial yarn is 7.6cN/dtex.
As can be seen from comparing example 1 with comparative example 2, in comparative example 2, the component containing unsaturated groups is not added in the core layer, and the crosslinked structure between the skin layer and the core layer cannot be realized, which affects the interfacial bonding force between the two components to a certain extent, and when stretching, asynchronous deformation of the skin layer and the core layer is caused, so that the skin layer and the core layer are not broken at the same time, and the breaking strength of the fiber is reduced.
Comparative example 3
The preparation method of the polyester-nylon sheath-core type industrial yarn is basically the same as that of the embodiment 1, and the difference is that: the electron beam irradiation operation is omitted in step (4).
The tensile breaking strength of the finally prepared polyester-nylon sheath-core type industrial yarn is 7.2cN/dtex.
As can be seen from comparing example 1 with comparative example 3, omitting the electron beam irradiation operation, comparative example 3 fails to achieve an effective cross-linking structure between the skin layer and the core layer, which weakens the interfacial bonding force between the skin and the core layer, and causes asynchronous deformation of the skin layer and the core layer during stretching, resulting in non-simultaneous breakage of the skin layer and the core layer, and a decrease in the fiber breaking strength.
Example 2
A preparation method of polyester-nylon sheath-core type industrial yarn comprises the following steps:
(1) Preparing raw materials;
polyamide: polycaprolactam with a relative viscosity of 2.9;
unsaturated group-containing polyester-polyamide block copolymer II: the structural general formula is A-B, wherein a is 2, x is 6, y is 7, and the number average molecular weight is 32000g/mol;
and (3) polyester: polyethylene terephthalate having an intrinsic viscosity of 0.95dL/g;
unsaturated group-containing polyester-polyamide block copolymer I: the structural general formula is A-C, wherein a is 2, x is 5, b is 4, C is 6, z is 6, and the number average molecular weight is 17000g/mol;
(2) Preparing a skin material;
uniformly mixing polyamide and a polyester-polyamide segmented copolymer II containing unsaturated groups to obtain a skin layer material; wherein the content of the unsaturated group-containing polyester-polyamide block copolymer II is 2.1% of the mass of the polyamide;
(3) Preparing a core layer material;
uniformly mixing polyester and a polyester-polyamide block copolymer I containing unsaturated groups to obtain a core layer material; wherein the content of the unsaturated group-containing polyester-polyamide block copolymer I is 2.1% of the mass of the polyester;
(4) After melt spinning and forming are carried out on the sheath material and the core material with the mass ratio of 32:68 through a parallel composite spinning assembly to obtain fibers, electron beam irradiation is carried out first, and then thermal drafting is carried out, so that the polyester-nylon sheath-core industrial yarn is obtained;
wherein the zero-cut viscosity of the polyester-polyamide block copolymer II containing unsaturated groups is 280 Pa.s greater than the zero-cut viscosity of the polyamide at the extrusion temperature (i.e., the spinning temperature of the sheath material), and the zero-cut viscosity of the polyester-polyamide block copolymer I containing unsaturated groups is 270 Pa.s less than the zero-cut viscosity of the polyester at the extrusion temperature (i.e., the spinning temperature of the core material); the dose of electron beam irradiation is 31.5kGy, the irradiation dose rate is 0.15kGy/s, and the irradiation time is 3.5min;
the technological parameters of melt spinning forming are as follows: the spinning temperature of the core layer material is 303 ℃, the spinning temperature of the skin layer material is 278 ℃, the slow cooling temperature is 252 ℃, the cooling temperature is 26 ℃, the hot drawing temperature is 155 ℃, the multiplying power of the hot drawing is 4.5 times, and the heat setting temperature is 182 ℃.
The filament number of the finally prepared polyester-nylon sheath-core type industrial yarn is 4.5dtex, the tensile breaking strength is 8.25cN/dtex, the structure is a sheath-core structure, the sheath base material is polyamide, the core layer base material is polyester, and the polyester-polyamide block copolymer I containing unsaturated groups and the polyester-polyamide block copolymer II containing unsaturated groups are dispersed at the interface of the sheath and the core layer;
the polyamide segment of the polyester-polyamide block copolymer I containing unsaturated groups is inserted into the skin layer, and the polyester segment containing unsaturated groups is inserted into the core layer;
the polyamide segment of the polyester-polyamide block copolymer II containing unsaturated groups is inserted into the skin layer, and the polyester segment containing unsaturated groups is inserted into the core layer;
covalent bonds are formed between the unsaturated group-containing polyester-polyamide block copolymer I and the unsaturated group-containing polyester-polyamide block copolymer II.
Example 3
A preparation method of polyester-nylon sheath-core type industrial yarn comprises the following steps:
(1) Preparing raw materials;
polyamide: polycaprolactam with a relative viscosity of 3;
unsaturated group-containing polyester-polyamide block copolymer II: the structural general formula is A-B, wherein a is 3, x is 7, y is 8, and the number average molecular weight is 35000g/mol;
and (3) polyester: polyethylene terephthalate having an intrinsic viscosity of 1dL/g;
unsaturated group-containing polyester-polyamide block copolymer I: the structural general formula is A-C, wherein a is 2, x is 6, b is 4, C is 7,z and the number average molecular weight is 19000g/mol;
(2) Preparing a skin material;
uniformly mixing polyamide and a polyester-polyamide segmented copolymer II containing unsaturated groups to obtain a skin layer material; wherein the content of the unsaturated group-containing polyester-polyamide block copolymer II is 2.15% of the mass of the polyamide;
(3) Preparing a core layer material;
uniformly mixing polyester and a polyester-polyamide block copolymer I containing unsaturated groups to obtain a core layer material; wherein the content of the unsaturated group-containing polyester-polyamide block copolymer I is 2.15% of the mass of the polyester;
(4) Carrying out melt spinning forming on a sheath material and a core material with the mass ratio of 35:65 through a parallel composite spinning assembly to obtain fibers, then carrying out electron beam irradiation and then carrying out hot drawing to obtain the polyester-nylon sheath-core industrial yarn;
wherein the zero-cut viscosity of the polyester-polyamide block copolymer II containing unsaturated groups is 290 Pa.s greater than the zero-cut viscosity of polyamide at the extrusion temperature (i.e., the spinning temperature of the sheath material), the zero-cut viscosity of the polyester-polyamide block copolymer I containing unsaturated groups is 285 Pa.s less than the zero-cut viscosity of the polyester at the extrusion temperature (i.e., the spinning temperature of the core material), the dose of electron beam irradiation is 48kGy, the irradiation dose rate is 0.2kGy/s, and the irradiation time is 4min;
the technological parameters of melt spinning forming are as follows: the spinning temperature of the core layer material is 305 ℃, the spinning temperature of the skin layer material is 280 ℃, the slow cooling temperature is 254 ℃, the cooling temperature is 25 ℃, the heat drawing temperature is 160 ℃, the multiplying power of the heat drawing is 5 times, and the heat setting temperature is 184 ℃.
The filament number of the finally prepared polyester-nylon sheath-core type industrial yarn is 4.3dtex, the tensile breaking strength is 8.3cN/dtex, the structure is a sheath-core structure, the sheath base material is polyamide, the core layer base material is polyester, and the polyester-polyamide block copolymer I containing unsaturated groups and the polyester-polyamide block copolymer II containing unsaturated groups are dispersed at the interface of the sheath and the core layer;
the polyamide segment of the polyester-polyamide block copolymer I containing unsaturated groups is inserted into the skin layer, and the polyester segment containing unsaturated groups is inserted into the core layer;
the polyamide segment of the polyester-polyamide block copolymer II containing unsaturated groups is inserted into the skin layer, and the polyester segment containing unsaturated groups is inserted into the core layer;
covalent bonds are formed between the unsaturated group-containing polyester-polyamide block copolymer I and the unsaturated group-containing polyester-polyamide block copolymer II.
Example 4
A preparation method of polyester-nylon sheath-core type industrial yarn comprises the following steps:
(1) Preparing raw materials;
polyamide: polyhexamethylene adipamide having a relative viscosity of 3.1;
unsaturated group-containing polyester-polyamide block copolymer II: the structural general formula is A-B, wherein a is 3, x is 8, y is 10, and the number average molecular weight is 38000g/mol;
and (3) polyester: polyethylene terephthalate having an intrinsic viscosity of 1.05dL/g;
unsaturated group-containing polyester-polyamide block copolymer I: the structural general formula is A-C, wherein a is 2, x is 7, b is 5, C is 9, z is 8, and the number average molecular weight is 20000g/mol;
(2) Preparing a skin material;
uniformly mixing polyamide and a polyester-polyamide segmented copolymer II containing unsaturated groups to obtain a skin layer material; wherein the content of the unsaturated group-containing polyester-polyamide block copolymer II is 2.2% of the mass of the polyamide;
(3) Preparing a core layer material;
uniformly mixing polyester and a polyester-polyamide block copolymer I containing unsaturated groups to obtain a core layer material; wherein the content of the unsaturated group-containing polyester-polyamide block copolymer I is 2.2% of the mass of the polyester;
(4) Carrying out melt spinning forming on a sheath material and a core material with the mass ratio of 35:65 through a parallel composite spinning assembly to obtain fibers, then carrying out electron beam irradiation and then carrying out hot drawing to obtain the polyester-nylon sheath-core industrial yarn;
wherein the zero-cut viscosity of the polyester-polyamide block copolymer II containing unsaturated groups is 300 Pa.s greater than the zero-cut viscosity of polyamide at the extrusion temperature (i.e., the spinning temperature of the sheath material), the zero-cut viscosity of the polyester-polyamide block copolymer I containing unsaturated groups is 300 Pa.s less than the zero-cut viscosity of the polyester at the extrusion temperature (i.e., the spinning temperature of the core material), the dose of electron beam irradiation is 60kGy, the irradiation dose rate is 0.25kGy/s, and the irradiation time is 4min;
the technological parameters of melt spinning forming are as follows: the spinning temperature of the core layer material is 308 ℃, the spinning temperature of the skin layer material is 282 ℃, the slow cooling temperature is 255 ℃, the cooling temperature is 23 ℃, the hot drawing temperature is 165 ℃, the multiplying power of the hot drawing is 5.5 times, and the heat setting temperature is 186 ℃.
The filament number of the finally prepared polyester-nylon sheath-core type industrial yarn is 4dtex, the tensile breaking strength is 8.32cN/dtex, the structure is a sheath-core structure, the sheath base material is polyamide, the core base material is polyester, and the polyester-polyamide block copolymer I containing unsaturated groups and the polyester-polyamide block copolymer II containing unsaturated groups are dispersed at the interface of the sheath and the core;
the polyamide segment of the polyester-polyamide block copolymer I containing unsaturated groups is inserted into the skin layer, and the polyester segment containing unsaturated groups is inserted into the core layer;
the polyamide segment of the polyester-polyamide block copolymer II containing unsaturated groups is inserted into the skin layer, and the polyester segment containing unsaturated groups is inserted into the core layer;
covalent bonds are formed between the unsaturated group-containing polyester-polyamide block copolymer I and the unsaturated group-containing polyester-polyamide block copolymer II.
Example 5
A preparation method of polyester-nylon sheath-core type industrial yarn comprises the following steps:
(1) Preparing raw materials;
polyamide: polyhexamethylene adipamide having a relative viscosity of 3.2;
unsaturated group-containing polyester-polyamide block copolymer II: the structural general formula is A-B, wherein a is 4, x is 9, y is 12, and the number average molecular weight is 40000g/mol;
and (3) polyester: polyethylene terephthalate having an intrinsic viscosity of 1.1dL/g;
unsaturated group-containing polyester-polyamide block copolymer I: the structural general formula is A-C, wherein a is 3, x is 6, b is 5, C is 10, z is 9, and the number average molecular weight is 21000g/mol;
(2) Preparing a skin material;
uniformly mixing polyamide and a polyester-polyamide segmented copolymer II containing unsaturated groups to obtain a skin layer material; wherein the content of the unsaturated group-containing polyester-polyamide block copolymer II is 2.3% of the mass of the polyamide;
(3) Preparing a core layer material;
uniformly mixing polyester and a polyester-polyamide block copolymer I containing unsaturated groups to obtain a core layer material; wherein the content of the unsaturated group-containing polyester-polyamide block copolymer I is 2.3% of the mass of the polyester;
(4) Carrying out melt spinning forming on a sheath material and a core material with the mass ratio of 35:65 through a parallel composite spinning assembly to obtain fibers, then carrying out electron beam irradiation and then carrying out hot drawing to obtain the polyester-nylon sheath-core industrial yarn;
wherein the zero-cut viscosity of the polyester-polyamide block copolymer II containing unsaturated groups is 320 Pa.s greater than the zero-cut viscosity of polyamide at the extrusion temperature (i.e., the spinning temperature of the sheath material), the zero-cut viscosity of the polyester-polyamide block copolymer I containing unsaturated groups is 320 Pa.s less than the zero-cut viscosity of the polyester at the extrusion temperature (i.e., the spinning temperature of the core material), the dose of electron beam irradiation is 72kGy, the irradiation dose rate is 0.3kGy/s, and the irradiation time is 4min;
the technological parameters of melt spinning forming are as follows: the spinning temperature of the core layer material is 310 ℃, the spinning temperature of the skin layer material is 283 ℃, the slow cooling temperature is 258 ℃, the cooling temperature is 22 ℃, the heat drawing temperature is 170 ℃, the multiplying power of the heat drawing is 6 times, and the heat setting temperature is 187 ℃.
The filament number of the finally prepared polyester-nylon sheath-core type industrial yarn is 3.8dtex, the tensile breaking strength is 8.4cN/dtex, the structure is a sheath-core structure, the sheath base material is polyamide, the core layer base material is polyester, and the polyester-polyamide block copolymer I containing unsaturated groups and the polyester-polyamide block copolymer II containing unsaturated groups are dispersed at the interface of the sheath and the core layer;
the polyamide segment of the polyester-polyamide block copolymer I containing unsaturated groups is inserted into the skin layer, and the polyester segment containing unsaturated groups is inserted into the core layer;
the polyamide segment of the polyester-polyamide block copolymer II containing unsaturated groups is inserted into the skin layer, and the polyester segment containing unsaturated groups is inserted into the core layer;
covalent bonds are formed between the unsaturated group-containing polyester-polyamide block copolymer I and the unsaturated group-containing polyester-polyamide block copolymer II.
Example 6
A preparation method of polyester-nylon sheath-core type industrial yarn comprises the following steps:
(1) Preparing raw materials;
polyamide: polyhexamethylene adipamide having a relative viscosity of 3.3;
unsaturated group-containing polyester-polyamide block copolymer II: the structural general formula is A-B, wherein a is 4, x is 10, y is 13, and the number average molecular weight is 42000g/mol;
and (3) polyester: polyethylene terephthalate having an intrinsic viscosity of 1.15dL/g;
unsaturated group-containing polyester-polyamide block copolymer I: the structural general formula is A-C, wherein a is 3, x is 7, b is 6, C is 12, z is 9, and the number average molecular weight is 22000g/mol;
(2) Preparing a skin material;
uniformly mixing polyamide and a polyester-polyamide segmented copolymer II containing unsaturated groups to obtain a skin layer material; wherein the content of the unsaturated group-containing polyester-polyamide block copolymer II is 2.4% of the mass of the polyamide;
(3) Preparing a core layer material;
uniformly mixing polyester and a polyester-polyamide block copolymer I containing unsaturated groups to obtain a core layer material; wherein the content of the unsaturated group-containing polyester-polyamide block copolymer I is 2.4% of the mass of the polyester;
(4) Carrying out melt spinning forming on a sheath material and a core material with the mass ratio of 35:65 through a parallel composite spinning assembly to obtain fibers, then carrying out electron beam irradiation and then carrying out hot drawing to obtain the polyester-nylon sheath-core industrial yarn;
wherein the zero-cut viscosity of the polyester-polyamide block copolymer II containing unsaturated groups is 330 Pa.s greater than the zero-cut viscosity of polyamide at the extrusion temperature (i.e., the spinning temperature of the sheath material), the zero-cut viscosity of the polyester-polyamide block copolymer I containing unsaturated groups is 325 Pa.s less than the zero-cut viscosity of the polyester at the extrusion temperature (i.e., the spinning temperature of the core material), the dose of electron beam irradiation is 108kGy, the irradiation dose rate is 0.4kGy/s, and the irradiation time is 4.5min;
the technological parameters of melt spinning forming are as follows: the spinning temperature of the core layer material is 315 ℃, the spinning temperature of the skin layer material is 284 ℃, the slow cooling temperature is 259 ℃, the cooling temperature is 20 ℃, the hot drawing temperature is 175 ℃, the multiplying power of the hot drawing is 6.5 times, and the heat setting temperature is 188 ℃.
The filament number of the finally prepared polyester-nylon sheath-core type industrial yarn is 3.5dtex, the tensile breaking strength is 8.5cN/dtex, the structure is a sheath-core structure, the sheath base material is polyamide, the core layer base material is polyester, and the polyester-polyamide block copolymer I containing unsaturated groups and the polyester-polyamide block copolymer II containing unsaturated groups are dispersed at the interface of the sheath and the core layer;
the polyamide segment of the polyester-polyamide block copolymer I containing unsaturated groups is inserted into the skin layer, and the polyester segment containing unsaturated groups is inserted into the core layer;
the polyamide segment of the polyester-polyamide block copolymer II containing unsaturated groups is inserted into the skin layer, and the polyester segment containing unsaturated groups is inserted into the core layer;
covalent bonds are formed between the unsaturated group-containing polyester-polyamide block copolymer I and the unsaturated group-containing polyester-polyamide block copolymer II.
Example 7
A preparation method of polyester-nylon sheath-core type industrial yarn comprises the following steps:
(1) Preparing raw materials;
polyamide: polyhexamethylene adipamide having a relative viscosity of 3.5;
unsaturated group-containing polyester-polyamide block copolymer II: the structural general formula is A-B, wherein a is 4, x is 12, y is 15, and the number average molecular weight is 45000g/mol;
and (3) polyester: polyethylene terephthalate having an intrinsic viscosity of 1.2dL/g;
unsaturated group-containing polyester-polyamide block copolymer I: the structural general formula is A-C, wherein a is 3, x is 8, b is 6, C is 13, z is 10, and the number average molecular weight is 25000g/mol;
(2) Preparing a skin material;
uniformly mixing polyamide and a polyester-polyamide segmented copolymer II containing unsaturated groups to obtain a skin layer material; wherein the content of the unsaturated group-containing polyester-polyamide block copolymer II is 2.5% of the mass of the polyamide;
(3) Preparing a core layer material;
uniformly mixing polyester and a polyester-polyamide block copolymer I containing unsaturated groups to obtain a core layer material; wherein the content of the unsaturated group-containing polyester-polyamide block copolymer I is 2.5% of the mass of the polyester;
(4) Carrying out melt spinning forming on a sheath material and a core material with the mass ratio of 40:60 through a parallel composite spinning assembly to obtain fibers, then carrying out electron beam irradiation and then carrying out hot drawing to obtain the polyester-nylon sheath-core industrial yarn;
wherein the zero-cut viscosity of the polyester-polyamide block copolymer II containing unsaturated groups is 350 Pa.s greater than the zero-cut viscosity of polyamide at the extrusion temperature (i.e., the spinning temperature of the sheath material), the zero-cut viscosity of the polyester-polyamide block copolymer I containing unsaturated groups is 350 Pa.s less than the zero-cut viscosity of the polyester at the extrusion temperature (i.e., the spinning temperature of the core material), the dose of electron beam irradiation is 150kGy, the irradiation dose rate is 0.5kGy/s, and the irradiation time is 5min;
the technological parameters of melt spinning forming are as follows: the spinning temperature of the core layer material is 320 ℃, the spinning temperature of the skin layer material is 285 ℃, the slow cooling temperature is 260 ℃, the cooling temperature is 18 ℃, the heat drawing temperature is 180 ℃, the multiplying power of the heat drawing is 7 times, and the heat setting temperature is 190 ℃.
The filament number of the finally prepared polyester-nylon sheath-core type industrial yarn is 3dtex, the tensile breaking strength is 8.65cN/dtex, the structure is a sheath-core structure, the sheath base material is polyamide, the core base material is polyester, and the polyester-polyamide block copolymer I containing unsaturated groups and the polyester-polyamide block copolymer II containing unsaturated groups are dispersed at the interface of the sheath and the core;
the polyamide segment of the polyester-polyamide block copolymer I containing unsaturated groups is inserted into the skin layer, and the polyester segment containing unsaturated groups is inserted into the core layer;
the polyamide segment of the polyester-polyamide block copolymer II containing unsaturated groups is inserted into the skin layer, and the polyester segment containing unsaturated groups is inserted into the core layer;
covalent bonds are formed between the unsaturated group-containing polyester-polyamide block copolymer I and the unsaturated group-containing polyester-polyamide block copolymer II.
Claims (8)
1. The polyester-polyamide sheath-core type industrial yarn has a sheath-core structure, wherein a sheath substrate is polyamide, and a core substrate is polyester, and is characterized in that a polyester-polyamide block copolymer I containing unsaturated groups and a polyester-polyamide block copolymer II containing unsaturated groups are dispersed at the interface of the sheath and the core;
the polyamide segment of the polyester-polyamide block copolymer I containing unsaturated groups is inserted into the skin layer, and the polyester segment containing unsaturated groups is inserted into the core layer;
the polyamide segment of the polyester-polyamide block copolymer II containing unsaturated groups is inserted into the skin layer, and the polyester segment containing unsaturated groups is inserted into the core layer;
covalent bonds are formed between the unsaturated group-containing polyester-polyamide block copolymer I and the unsaturated group-containing polyester-polyamide block copolymer II;
the zero-cut viscosity of the polyester-polyamide block copolymer II containing unsaturated groups is greater than the zero-cut viscosity of the polyamide at the extrusion temperature, and the zero-cut viscosity of the polyester-polyamide block copolymer I containing unsaturated groups is less than the zero-cut viscosity of the polyester at the extrusion temperature.
2. The polyester-nylon sheath-core type industrial yarn according to claim 1, wherein the polyester-nylon sheath-core type industrial yarn has a single filament fineness of 3dtex or more and a tensile breaking strength of 8.2cN/dtex or more.
3. The method for preparing the polyester-nylon sheath-core industrial yarn according to claim 1 or 2, which is characterized in that after melt spinning and forming are carried out on a sheath material and a core material through a parallel composite spinning assembly to obtain a fiber, electron beam irradiation is carried out first, and then thermal drafting is carried out, so that the polyester-nylon sheath-core industrial yarn is obtained;
the skin material is a mixture of polyamide and polyester-polyamide block copolymer II containing unsaturated groups, and the zero-cut viscosity of the polyester-polyamide block copolymer II containing unsaturated groups is larger than that of polyamide at the extrusion temperature;
the core layer material is a mixture of polyester and polyester-polyamide block copolymer I containing unsaturated groups, and the zero-cut viscosity of the polyester-polyamide block copolymer I containing unsaturated groups at the extrusion temperature is smaller than that of the polyester;
after electron beam irradiation, the unsaturated group-containing polyester-polyamide block copolymer II is chemically crosslinked with the unsaturated group-containing polyester-polyamide block copolymer I.
4. A method according to claim 3, wherein the structural formulae of the unsaturated group-containing polyester-polyamide block copolymer I and the unsaturated group-containing polyester-polyamide block copolymer II are each independently selected from a-B and a-C, the a segment being an unsaturated group-containing polyester segment, the a segment having the following structural formula:
the structural formula of the section B is as follows:
the structural formula of the section C is as follows:
wherein a is 2, 3 or 4, b is 4, 5 or 6, c is 5, 6, 7, 9, 10, 12 or 13, x is 5 to 12, y is 6 to 15, and z is 5 to 10;
the dose of the electron beam irradiation is 18-150 kGy, the irradiation dose rate is 0.1-0.5 kGy/s, and the irradiation time is 3-5 min.
5. A method according to claim 3, wherein the content of the unsaturated group-containing polyester-polyamide block copolymer II in the skin layer material is 2 to 2.5% by mass of the polyamide; the content of the unsaturated group-containing polyester-polyamide block copolymer I in the core layer material is 2 to 2.5 percent of the mass of the polyester.
6. A method according to claim 3, characterized in that in the skin material the polyamide is polycaprolactam or polyhexamethylene adipamide, the relative viscosity of the polyamide is 2.8-3.5, the number average molecular weight of the polyester-polyamide block copolymer II containing unsaturated groups is 30000-45000 g/mol, the zero cut viscosity of the polyester-polyamide block copolymer II containing unsaturated groups at extrusion temperature is 250-350 Pa-s greater than the zero cut viscosity of the polyamide;
in the core layer material, the polyester is polyethylene terephthalate, the intrinsic viscosity of the polyester is 0.9-1.2 dL/g, the number average molecular weight of the polyester-polyamide block copolymer I containing unsaturated groups is 15000-25000 g/mol, and the zero-cut viscosity of the polyester-polyamide block copolymer I containing unsaturated groups is 250-350 Pa.s smaller than the zero-cut viscosity of the polyester at the extrusion temperature.
7. A method according to claim 3, wherein the mass ratio of skin material to core material is 30-40:70-60.
8. A method according to claim 3, wherein the process parameters of melt spinning formation comprise: the spinning temperature of the core layer material is 300-320 ℃, the spinning temperature of the skin layer material is 275-285 ℃, the slow cooling temperature is 250-260 ℃, the cooling temperature is 18-28 ℃, the hot drawing temperature is 150-180 ℃, the multiplying power of the hot drawing is 4-7 times, and the heat setting temperature is 180-190 ℃.
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| CN108642598A (en) * | 2018-05-24 | 2018-10-12 | 浙江佑威新材料有限公司 | One kind washing bright and beautiful core-skin type industrial yarn and preparation method thereof |
| CN109206621A (en) * | 2018-07-17 | 2019-01-15 | 东华大学 | A method of improving polyamide and polyester compatibility |
| CN112281229A (en) * | 2020-09-30 | 2021-01-29 | 浙江恒澜科技有限公司 | Preparation method of polyester fiber with special surface structure |
| CN113403705A (en) * | 2021-07-09 | 2021-09-17 | 江苏柯能新材料有限公司 | Skin-core composite polyester thermal fuse device and process thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108642598A (en) * | 2018-05-24 | 2018-10-12 | 浙江佑威新材料有限公司 | One kind washing bright and beautiful core-skin type industrial yarn and preparation method thereof |
| CN109206621A (en) * | 2018-07-17 | 2019-01-15 | 东华大学 | A method of improving polyamide and polyester compatibility |
| CN112281229A (en) * | 2020-09-30 | 2021-01-29 | 浙江恒澜科技有限公司 | Preparation method of polyester fiber with special surface structure |
| CN113403705A (en) * | 2021-07-09 | 2021-09-17 | 江苏柯能新材料有限公司 | Skin-core composite polyester thermal fuse device and process thereof |
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