CN113046851A - Manufacturing method of high-strength high-dimensional-stability HMLS polyester industrial yarn - Google Patents
Manufacturing method of high-strength high-dimensional-stability HMLS polyester industrial yarn Download PDFInfo
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- 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
- D01D5/12—Stretch-spinning methods
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- 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
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- 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
- D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
- D01F6/62—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyesters
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Abstract
The invention belongs to the technical field of manufacturing of polyester industrial yarns, and particularly relates to a manufacturing method of a high-strength high-dimensional-stability HMLS polyester industrial yarn. According to the invention, conventional polyester chips are subjected to solid-phase polycondensation tackifying to form high-viscosity polyester chips, then the high-viscosity polyester chips are subjected to spinning screw extruder to prepare high-viscosity polyester melt, the high-viscosity polyester melt is distributed to each melt branch pipe through a melt main pipe, enters a spinning assembly through a metering pump and then is extruded from a spinneret plate of the assembly, is heated by a heating cylinder, enters an air blowing cooling way and then passes through a spinning channel; applying oil on the surface of the silk, stretching at normal temperature for the first stage, performing hot stretching for the second stage, performing high-temperature equal-speed hot setting, finally performing loose setting, and coiling for forming, wherein the total stretching multiple is 1.75-2.20; and winding at 6400-7000m/min to obtain the polyester industrial yarn with the strength of 8.2-8.5cN/dtex and the dimensional stability of less than 8.0%, which can be widely applied in the fields of radial tires of light trucks and cars, hard cords of V-belts, transmission belts, high-grade geogrids, high-end automobile tires, conveyor belts, rubber hose tapes, etc.
Description
Technical Field
The invention belongs to the technical field of manufacturing of polyester industrial yarns, and particularly relates to a manufacturing method of a high-strength high-dimensional-stability HMLS polyester industrial yarn.
Background
Since the polyester industrial yarn curtain line is developed in the early 60 th of the 20 th century, the production technology, equipment and application of the polyester industrial yarn become mature through development and improvement for many years. Because of good performance, lower production cost and better production environment of the polyester industrial yarn, the polyester industrial yarn becomes four rubber framework materials at present together with nylon, steel wires and viscose strong yarns; the polyester industrial yarn is mainly used as a rubber framework material, and the development power of the polyester industrial yarn is firstly from the requirement of the radial development of tires.
With the development of high-grade roads and luxury saloon cars, the speed level of the tire is higher and higher, and the performance requirement of the automobile on the tire is more and more strict; the speed grade of the high-performance radial tire of the passenger car is generally above H grade, and the tire is required to have the characteristics of good high-speed performance, low rolling resistance and long service life. The carcass framework material plays an important role in the characteristics of the tire, such as high-speed performance, durability and handling; the High-Modulus Low-Shrinkage polyester industrial yarns (HMLS polyester industrial yarns for short, wherein the HMLS is called High modules and Low Shrinkage, High-Modulus Low-Shrinkage) are the mainstream products for rubber tires, and the number of manufacturers is large. At present, the upgrading and upgrading high-quality industrial yarn of the HMLS polyester industrial yarn is the HMLS polyester industrial yarn with high strength and high dimensional stability, and represents a direction for the development of the polyester industrial yarn.
It is known that, when producing high-strength HMLS polyester industrial yarns in the same melt, the draft ratio needs to be large compared with conventional HMLS polyester industrial yarns and high-dimensional-stability HMLS polyester industrial yarns, and the draft ratio increases within a certain range, so that the strength of the precursor is increased, the dry-heat shrinkage ratio is increased, the constant-load elongation is reduced, and the dimensional stability of the precursor is reduced. And the production of the high-dimensional stability HMLS polyester industrial yarn has the back draft multiple equivalent to that of the production of the conventional polyester industrial yarn and smaller than that of the high-strength HMLS polyester industrial yarn under the same solution condition, and the dimensional stability of the protofilament is far better than that of the high-strength HMLS polyester industrial yarn, but the strength of the protofilament is far smaller than that of the high-strength HMLS polyester industrial yarn. The high-strength HMLS polyester industrial yarn needs to be prepared from a high-viscosity polyester chip, high non-oil yarn viscosity and high draft ratio to obtain the high-strength HMLS polyester industrial yarn, in the actual production process, the industrial yarn produced under the conditions is generally poor in production stability and brings load to production stability, and meanwhile, the size stability of the prepared high-strength HMLS polyester industrial yarn is poorer than that of the conventional polyester HMLS industry.
The manufacturing of the high-dimensional-stability HMLS polyester industrial yarn needs to improve the spinning speed, further improve the spinning tension and improve the orientation degree and the crystallinity of the primary-stretching yarn, the improvement of the spinning speed can bring the loss of the strength of the original yarn, and the strength of the manufactured high-dimensional-stability HMLS polyester industrial yarn is slightly lower than that of the conventional HMLS polyester industrial yarn. The high-strength HMLS polyester industrial yarn and the method for manufacturing the high-dimensional-stability HMLS polyester industrial yarn are contradictory and contradictory in some aspects.
Disclosure of Invention
The invention aims to provide a method for manufacturing high-strength high-dimensional-stability HMLS polyester industrial yarns, aiming at the defects in the prior art. The invention develops a method for preparing high-strength high-dimensional stability high-modulus polyester industrial yarn by tackifying polyester chips through solid phase polycondensation, obtaining high-viscosity polyester chips with the viscosity of 1.16-1.26dl/g, performing high-speed melt spinning on the high-viscosity chips, drafting by a two-step method, performing high-temperature constant-speed heat setting on the high-viscosity chips, and finally performing heat relaxation setting.
In order to solve the defects of the prior art, the invention adopts the following technical scheme: a manufacturing method of HMLS polyester industrial yarns with high strength and high dimensional stability comprises the following steps:
(1) processing high-viscosity polyester chips: pre-crystallizing a polyester chip raw material, and then performing solid-phase polycondensation and tackifying to obtain a high-viscosity polyester chip, wherein the viscosity of the tackified polyester chip is 1.16-1.26 dl/g;
(2) melt spinning: feeding the high-viscosity polyester chip obtained in the step (1) into a screw extruder with the set temperature of 285-315 ℃ for heating and melting for 1-3 min; distributing high-viscosity polyester melt obtained by heating and melting to each melt branch pipe through a main pipe, then entering a spinning assembly through a metering pump, and extruding the high-viscosity polyester melt into tows from a spinneret plate, wherein the main pipe, the branch pipes, the metering pump and the assembly of the melt are heated and insulated by biphenyl heat transfer oil, the melt is extruded from the spinneret plate in the spinning assembly, a slow cooling heating cylinder is arranged below the spinneret plate, and the extruded melt is blown, cooled and solidified to extrude fibers;
(3) drafting and winding: and (3) drafting and winding the fiber obtained in the step (2) through a channel, oiling the surface of the filament bundle, performing primary drafting and secondary drafting, performing high-temperature constant-speed heat setting, relaxation setting, and finally coiling and forming, wherein the total stretching multiple is 1.75-2.20, so that the high-strength high-dimensional stability high-modulus low-shrinkage polyester industrial yarn is prepared.
Further, the primary drafting is formed in the speed difference between the first pair of drafting rollers and the second pair of drafting rollers, the secondary drafting is formed in the speed difference between the second pair of drafting rollers and the third pair of drafting rollers, after high-temperature constant-speed heat setting, speed-reducing retraction heat setting is carried out on the last pair of drafting rollers, and finally coiling forming is carried out at the speed of 6400-7000 m/min.
Further, the pre-crystallization temperature is 170-200 ℃, and the pre-crystallization time is 15-20 min.
Furthermore, the water content of the tackified polyester chip is less than 30ppm, and the carboxyl content is less than 15 mol/t.
Further, the draft multiple of the primary draft is 1.1-1.5, the draft multiple of the secondary draft is 1.2-1.5, and the retraction ratio of the decelerating retraction heat setting is 0.9-1.0.
Further, the temperature of the first pair of drafting rollers is closed, the temperature of the second pair of drafting rollers is 80-200 ℃, and the temperature of the third pair of drafting rollers is 200-; the temperature of the high-temperature equal-speed heat setting drawing roller is 200-260 ℃, and the temperature of the sixth pair of drawing rollers is 100-200 ℃.
Further, the oilless filament viscosity of the high-strength high-dimensional stability high-modulus low-shrinkage polyester industrial filament is 0.95-1.05 dl/g.
Further, the high strength and high dimensional stability polyester industrial yarn has the strength not less than 8.2cN/dtex and the dimensional stability index lower than 8.0%.
Compared with the prior art, the invention has the following advantages:
the invention relates to a method for tackifying polyester chips into high-viscosity polyester chips by adopting solid phase polycondensation, wherein amorphous polyester chips with the viscosity of 0.675 +/-0.010 dl/g (according to chip acceptance standards) are tackified by adopting solid phase polycondensation to prepare the high-viscosity polyester chips with the viscosity of 1.16-1.26dl/g, the high-viscosity polyester chips are heated by a screw extruder to prepare high-viscosity polyester melt, the high-viscosity polyester melt is distributed to each melt branch pipe by a melt main pipe and then enters a spinning assembly by a metering pump and then is extruded from a spinneret plate, the melt main pipe, the branch pipes, the metering pump and the assembly are heated and insulated by biphenyl, a heating cylinder is arranged below the spinneret plate, tows are cooled by circular blowing air and are solidified and molded, the circular blowing air temperature is 60 ℃, the relative humidity is 70%, and the molded tows enter a. Applying oil on the surface of the filaments, performing primary normal-temperature drafting, performing secondary hot drafting, performing high-temperature equal-speed hot setting, finally performing loose setting, and coiling and forming, wherein the total stretching multiple is 1.75-2.20; and winding at 6400-7000m/min, the prepared polyester industrial yarn has the strength not less than 8.2cN/dtex and the dimensional stability less than 8.0%, and the cord after dipping has the characteristics of high breaking strength, high dimensional stability, high modulus and the like, and can be widely applied to the fields of radial tires of light trucks and cars, hard cords of V-belts, transmission belts, high-grade geogrids, high-end automobile tires, conveyor belts, rubber hose tapes and the like.
The high-strength high-dimensional stability HMLS polyester industrial yarn prepared by the invention generates a supermolecular structure with higher orientation degree, high crystallinity and proper undefined region when polyester macromolecules are formed into fibers in the preparation process, the supermolecular structure is formed by improving the polymerization degree of the polyester macromolecules, high-speed spinning, effective filament bundle cooling, higher drawing multiple and high-temperature shaping, and the product has excellent mechanical properties such as higher breaking strength, higher initial modulus, better dimensional stability and the like, improves the strength of the HMLS polyester industrial yarn, also improves the dimensional stability, and solves the contradiction between the strength and the dimensional stability. The invention is verified theoretically, and the high-strength high-dimensional-stability high-modulus low-shrinkage polyester industrial yarn is prepared in actual production, and the production stability is verified.
Detailed Description
The technical solution of the present invention will be further described with reference to specific examples.
Example 1
A manufacturing method of HMLS polyester industrial yarns with high strength and high dimensional stability comprises the following steps:
(1) production of high-viscosity polyester chip: taking a low-viscosity polyester chip with the relative viscosity of 0.670dl/g, pre-crystallizing the low-viscosity polyester chip at the pre-crystallization temperature of 170 ℃ for 20min, then performing solid phase polycondensation and tackifying at the temperature of 210 ℃, wherein the relative viscosity of the tackified polyester chip is 1.16dl/g, the water content is 27ppm, and the carboxyl content is 9 mol/t;
(2) and (3) melt spinning process: feeding high-viscosity polyester slices subjected to solid phase polycondensation and tackifying into a screw extruder with the thickness of 175mm, heating and melting at the temperature of 298 ℃ to obtain high-viscosity polyester melt, distributing the melt to each melt branch pipe through a main pipe, then feeding the melt into a spinning assembly through a metering pump, heating and preserving the heat of the main pipe, the branch pipes, the metering pump and the assembly by biphenyl heat transfer oil, wherein the heat preservation temperature of the biphenyl heat transfer oil is 298 ℃, extruding the melt through a spinneret plate in the spinning assembly, arranging a slow cooling heating cylinder below the spinneret plate, and cooling and solidifying the sprayed melt by circular blowing with the air temperature of 60 ℃, RH 70% and the average air speed of 0.45 m/s; the fiber passes through a channel, is oiled at an oiling device and then enters a first pair of drawing rollers;
(3) drafting and winding process: applying oil on the surface of the silk, closing the first pair of drawing rollers to heat, stretching at normal temperature at the first stage, performing hot stretching at 90 ℃ at the second stage, performing high-temperature constant-speed hot setting, finally performing loose setting, and coiling and forming, wherein the total stretching multiple is 1.93; and winding at 6600m/min to obtain 1100dtex/250F high-strength high-dimensional stability high-modulus low-shrinkage polyester industrial yarn.
The relevant process parameters in the manufacturing process are as follows:
table 1 example 1 relevant process parameters in the manufacture of polyester industrial yarn
Example 2
A manufacturing method of HMLS polyester industrial yarns with high strength and high dimensional stability comprises the following steps:
(1) production of high-viscosity polyester chip: taking a low-viscosity polyester chip with the relative viscosity of 0.675, pre-crystallizing the polyester chip at 185 ℃ for 20min, then performing solid-phase polycondensation tackifying at 220 ℃, wherein the relative viscosity of the tackified chip is 1.21dl/g, the water content is 25ppm, and the carboxyl content is 11 mol/t;
(2) and (3) melt spinning process: feeding high-viscosity polyester chips obtained by solid phase polymerization into a screw extruder with the diameter of 175mm, heating and melting at 320 ℃ to obtain high-viscosity polyester melt, distributing the melt to each melt branch pipe through a main pipe, then feeding the melt into a spinning assembly through a metering pump, heating and preserving the heat of the melt main pipe, the branch pipes, the metering pump and the assembly by biphenyl heat transfer oil, wherein the heat preservation temperature of the biphenyl heat transfer oil is 320 ℃, extruding the melt in the spinning assembly through a spinneret plate, arranging a slow cooling heating cylinder below the spinneret plate, and cooling and solidifying the sprayed melt by circular blowing with the air temperature of 60 ℃, the RH of 70 percent and the average air speed of 0.55m/s to extrude fibers; the fiber passes through a channel, is oiled at an oiling device and then enters a first pair of drawing rollers;
(3) drafting and winding process: applying oil on the surface of the yarn, closing the first pair of drawing rollers to heat, stretching at normal temperature at the first stage, performing hot stretching at 90 ℃ at the second stage, performing high-temperature constant-speed hot setting, finally performing loose setting, and coiling and forming, wherein the total stretching multiple is 1.90; and winding at 6600m/min to obtain 1440dtex/325F high-strength high-dimensional stability high-modulus low-shrinkage polyester industrial yarn.
The relevant process parameters in the manufacturing process are as follows:
table 2 example 2 relevant process parameters in the polyester industrial yarn manufacturing process
Example 3
A manufacturing method of HMLS polyester industrial yarns with high strength and high dimensional stability comprises the following steps:
(1) production of high-viscosity polyester chip: taking a low-viscosity polyester chip with the relative viscosity of 0.675, pre-crystallizing the polyester chip at the pre-crystallization temperature of 200 ℃ for 20min, and then performing solid-phase polycondensation tackifying at the temperature of 230 ℃ to ensure that the relative viscosity of the chip after solid-phase polymerization reaches 1.26dl/g, the water content is 24ppm and the carboxyl content is 12 mol/t;
(2) and (3) melt spinning process: feeding high-viscosity polyester chips obtained by solid phase polymerization into a screw extruder with the diameter of 175mm, heating and melting at the temperature of 260 ℃ to obtain high-viscosity polyester melt, distributing the melt to each melt branch pipe through a main pipe, then feeding the melt into a spinning assembly through a metering pump, and heating and insulating the melt main pipe, the melt branch pipes, the metering pump and the assembly by biphenyl heat-conducting oil, wherein the biphenyl heat-insulating temperature is 260 ℃. The melt is extruded from a spinneret plate in a spinning assembly, a slow cooling heating cylinder is arranged below the spinneret plate, and the extruded melt is cooled and solidified to extrude fiber through circular blowing at 60 ℃ of air temperature, 70% of RH and 0.60m/s of average air speed; the fiber passes through a channel, is oiled at an oiling device and then enters a first pair of drawing rollers;
(3) drafting and winding process: oiling on the surface of the silk, closing the first pair of drawing rollers to heat, stretching at normal temperature at the first stage, performing hot stretching at 90 ℃ at the second stage, performing high-temperature constant-speed hot setting, finally performing loose setting, and coiling and forming, wherein the total stretching multiple is 1.88; and winding at 6600m/min to obtain 1670dtex/375F high-strength high-dimensional stability high-modulus low-shrinkage polyester industrial yarn.
The relevant process parameters in the manufacturing process are as follows:
table 3 example 3 relevant process parameters in the polyester industrial yarn manufacturing process
Comparative example 1
A manufacturing method of high-strength HMLS polyester industrial yarn comprises the following steps:
(1) production of high-viscosity polyester chip: taking a low-viscosity polyester chip with the relative viscosity of 0.675, pre-crystallizing the polyester chip at the pre-crystallization temperature of 170 ℃ for 20min, and then performing solid-phase polycondensation tackifying at the temperature of 210 ℃ to ensure that the relative viscosity of the chip after solid-phase polymerization reaches 1.12 dl/g; the water content is 25ppm, and the carboxyl content is 11 mol/t;
(2) and (3) melt spinning process: feeding high-viscosity polyester chips obtained by solid phase polymerization into a screw extruder with the diameter of 175mm, heating and melting at the temperature of 298 ℃ to obtain high-viscosity polyester melt, distributing the melt to each melt branch pipe through a main pipe, then feeding the melt into a spinning assembly through a metering pump, and heating and insulating the melt main pipe, the melt branch pipes, the metering pump and the assembly by biphenyl heat-conducting oil, wherein the biphenyl heat-insulating temperature is 298 ℃. The melt is extruded from a spinneret plate in a spinning assembly, a slow cooling heating cylinder is arranged below the spinneret plate, and the extruded melt is cooled and solidified to extrude fiber through circular blowing at 60 ℃ of air temperature, 70% of RH and 0.45m/s of average air speed; the fiber passes through a channel, is oiled at an oiling device and then enters a first pair of drawing rollers;
(3) drawing and winding, namely applying oil on the surface of the filament, drawing at 80 ℃ in the first stage, drawing at 95 ℃ in the second stage, performing high-temperature equal-speed heat setting, finally performing loose setting and coiling forming, wherein the total drawing multiple is 1.91; and winding at the speed of 5725m/min to obtain the 1100dtex/250F high-strength high-modulus low-shrinkage polyester industrial yarn.
The relevant process parameters in the manufacturing process are as follows:
table 4 comparative example 1 polyester industrial yarn manufacturing process relevant process parameters
Comparative example 2
A manufacturing method of high-dimensional-stability HMLS polyester industrial yarns comprises the following steps:
(1) production of high-viscosity polyester chip: taking a low-viscosity polyester chip with the relative viscosity of 0.675, pre-crystallizing the raw material of the polyester chip at 185 ℃ for 20min, and then performing solid-phase polycondensation tackifying at 220 ℃ to ensure that the relative viscosity of the chip after solid-phase polymerization reaches 1.20 dl/g; after tackifying, the slice contains 27ppm of water and 10mol/t of carboxyl;
(2) and (3) melt spinning process: feeding high-viscosity polyester chips obtained by solid phase polymerization into a screw extruder with the diameter of 175mm, heating and melting at the temperature of 298 ℃ to obtain high-viscosity polyester melt, distributing the melt to each melt branch pipe through a main pipe, then feeding the melt into a spinning assembly through a metering pump, and heating and insulating the melt main pipe, the melt branch pipes, the metering pump and the assembly by biphenyl heat-conducting oil, wherein the biphenyl heat-insulating temperature is 298 ℃. The melt is extruded from a spinneret plate in a spinning assembly, a slow cooling heating cylinder is arranged below the spinneret plate, and the extruded melt is cooled and solidified to extrude fiber through circular blowing at 60 ℃ of air temperature, 70% of RH and 0.45m/s of average air speed; the fiber passes through a channel, is oiled at an oiling device and then enters a first pair of drawing rollers;
(3) drawing and winding, namely applying oil on the surface of the silk, drawing at 80 ℃ in the first stage, drawing at 95 ℃ in the second stage, performing high-temperature equal-speed heat setting, finally performing loose setting and coiling forming, wherein the total drawing multiple is 1.48; and winding at 6220m/min to obtain 1100dtex/250F high-dimensional stability high-modulus low-shrinkage polyester industrial yarn.
The relevant process parameters in the manufacturing process are as follows:
table 5 comparative example 2 polyester industrial yarn manufacturing process relevant process parameters
The polyester industrial yarns prepared in the examples 1-3 and the comparative examples 1-2 are compared in relevant performance, and the product indexes are as follows:
TABLE 6 comparison of relevant Properties of polyester industrial yarn obtained in examples 1-3 and comparative examples 1-2
(1) As shown in table 6, the high tenacity of the high tenacity high dimensional stability HMLS polyester industrial yarn of the present invention is characterized by the breaking strength, with higher values representing higher strand tenacity; the strength of the polyester industrial yarn is more than 8.2 cN/dtex.
(2) As shown in Table 6, the high dimensional stability of the high tenacity high dimensional stability HMLS polyester industrial yarn of the present invention is characterized by the sum of the constant load elongation of 4.0cN/dtex and the dry heat shrinkage rate under the conditions of 177 ℃, 2min and 0.05cN/dtex, and the smaller the sum, the better the dimensional stability; the polyester industrial yarn has a constant load elongation of 4.0cN/dtex and a dry heat shrinkage rate of less than 8.0% under the conditions of 177 ℃, 2min and 0.05 cN/dtex.
(3) As shown in Table 6, the Low Shrinkage of the HMLS (High Module and Low Shrinkage HMLS for short) polyester industrial yarn of the present invention is characterized by the dry heat Shrinkage rate at 177 ℃, 2min and 0.05cN/dtex, and the smaller the heat Shrinkage rate, the better the Low Shrinkage performance of the polyester industrial yarn; the dry heat shrinkage rate of the polyester industrial yarn is lower than 3.0% under the conditions of 177 ℃, 2min and 0.05 cN/dtex.
(4) As shown in table 6, the High Modulus of the HMLS (HMLS for High modules and Low Shrinkage) polyester industrial yarn of the present invention is characterized by a constant load elongation of 4.0cN/dtex, and the smaller the elongation, the higher the Modulus of the polyester industrial yarn; the elongation of the polyester industrial yarn under the constant load of 4.0cN/dtex is less than 5.5%.
In order to obtain high molecular weight and high molecular orientation degree, the invention adopts solid phase polycondensation to tackify low-viscosity polyester slices to prepare high-viscosity polyester slices with the viscosity of 1.16-1.26dl/g, the high-viscosity polyester slices are heated by a screw extruder to prepare high-viscosity polyester melt, the high-viscosity polyester melt is distributed to each melt branch pipe by a melt header pipe and then enters a spinning assembly by a metering pump and then is extruded from a spinneret plate, the melt header pipe, the branch pipes, the metering pump and the assembly are heated and insulated by biphenyl, a heating cylinder is arranged below the spinneret plate, filament bundles are cooled and solidified by circular blowing, the temperature of circular blowing is 60 ℃, the relative humidity is 70%, and the formed filament bundles enter a spinning channel to be drawn and wound; oiling on the surface of the yarn, performing primary normal-temperature drafting, performing secondary drafting, performing high-temperature equal-speed heat setting, finally performing relaxation setting, and coiling and forming, wherein the total stretching multiple is 1.75-2.20; and winding at 6400-7000m/min, wherein the strength of the prepared polyester industrial yarn is not less than 8.2cN/dtex, the size stability index of the precursor is less than 8.0%, and the prepared HMLS polyester industrial yarn with high strength and high size stability can be widely applied to the fields of radial tires of light trucks and cars, hard cords of V-belts, transmission belts, high-grade geogrids, high-end automobile tires, conveyor belts, rubber hose tapes and the like.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (8)
1. A manufacturing method of HMLS polyester industrial yarns with high strength and high dimensional stability is characterized by comprising the following steps:
(1) processing high-viscosity polyester chips: pre-crystallizing a polyester chip raw material, and then performing solid-phase polycondensation and tackifying to obtain a high-viscosity polyester chip, wherein the viscosity of the tackified polyester chip is 1.16-1.26 dl/g;
(2) melt spinning: feeding the high-viscosity polyester chip obtained in the step (1) into a screw extruder with the set temperature of 285-315 ℃ for heating and melting for 1-3 min; distributing high-viscosity polyester melt obtained by heating and melting to each melt branch pipe through a main pipe, then entering a spinning assembly through a metering pump, and extruding the high-viscosity polyester melt into tows from a spinneret plate, wherein the main pipe, the branch pipes, the metering pump and the assembly of the melt are heated and insulated by biphenyl heat transfer oil, the melt is extruded from the spinneret plate in the spinning assembly, a slow cooling heating cylinder is arranged below the spinneret plate, and the extruded melt is blown, cooled and solidified to extrude fibers;
(3) drafting and winding: and (3) drafting and winding the fiber obtained in the step (2) through a channel, oiling the surface of the filament bundle, performing primary drafting and secondary drafting, performing high-temperature constant-speed heat setting, relaxation setting, and finally coiling and forming, wherein the total stretching multiple is 1.75-2.20, so that the high-strength high-dimensional stability high-modulus low-shrinkage polyester industrial yarn is prepared.
2. The method as claimed in claim 1, wherein the primary drawing is performed at a speed difference between the first pair of drawing rollers and the second pair of drawing rollers, the secondary drawing is performed at a speed difference between the second pair of drawing rollers and the third pair of drawing rollers, and after the high-temperature constant-speed heat setting, the final pair of drawing rollers is subjected to speed-reducing retraction heat setting, and finally the final pair of drawing rollers is subjected to coiling forming at a speed of 6400-7000 m/min.
3. The method as claimed in claim 1, wherein the pre-crystallization temperature is 170-200 ℃ and the pre-crystallization time is 15-20 min.
4. The method for manufacturing the HMLS polyester industrial yarn with high tenacity and high dimensional stability as claimed in claim 1, wherein the water content of the tackified polyester chips is less than 30ppm, and the carboxyl group content is less than 15 mol/t.
5. The method for producing a high tenacity and high dimensional stability HMLS polyester industrial yarn as claimed in claim 2, wherein said primary drawing is at a draft ratio of 1.1-1.5, said secondary drawing is at a draft ratio of 1.2-1.5, and said decelerated shrinkage heat setting has a shrinkage ratio of 0.9-1.0.
6. The method for manufacturing the high tenacity high dimensional stability HMLS polyester industrial yarn according to claim 2, wherein: the temperature of the first pair of drawing rollers is closed, the temperature of the second pair of drawing rollers is 80-200 ℃, and the temperature of the third pair of drawing rollers is 200-260 ℃; the temperature of the high-temperature equal-speed heat setting drawing roller is 200-260 ℃, and the temperature of the sixth pair of drawing rollers is 100-200 ℃.
7. The process for producing high tenacity high dimensional stability HMLS polyester industrial yarn according to claim 1, wherein said high tenacity high dimensional stability high modulus low shrinkage polyester industrial yarn has a non-oil yarn viscosity of 0.95 to 1.05 dl/g.
8. The method for manufacturing the high-tenacity high-dimensional-stability HMLS polyester industrial yarn according to claim 1, wherein the high-tenacity high-dimensional-stability HMLS polyester industrial yarn has a tenacity not less than 8.2cN/dtex and a dimensional stability index less than 8.0%.
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