CN109735938B - Preparation method of polyester low stretch yarn for hollowed-out rhombic fabric - Google Patents
Preparation method of polyester low stretch yarn for hollowed-out rhombic fabric Download PDFInfo
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Abstract
The invention relates to a preparation method of a polyester low stretch yarn for a hollow diamond fabric, which comprises the following steps of preparing a modified polyester POY yarn from a modified polyester melt according to a POY process, processing the modified polyester POY yarn according to a DTY process, arranging a groove breaking roller and a variable-frequency yarn moving device between a zero roller and a first roller of a DTY device, and passing modified polyester tows through the surface of the groove breaking roller to prepare the polyester low stretch yarn for the hollow diamond fabric, wherein the preparation method of the modified polyester comprises the following steps: uniformly mixing terephthalic acid, ethylene glycol and dihydric alcohol with a silicon-containing main chain, and then carrying out esterification reaction and polycondensation reaction in sequence. The dye uptake of the prepared polyester low stretch yarn for the hollowed-out diamond-shaped fabric at the temperature of 130 ℃ is 88.3-91.2%, and the K/S value is 22.62-25.54. The preparation method provided by the invention is reasonable in operation, and the prepared hollow-out rhombic polyester low-stretch yarn for the fabric is good in dyeing property.
Description
Technical Field
The invention belongs to the technical field of modified polyester fibers, and relates to a preparation method of polyester low stretch yarns for hollow diamond-shaped fabrics.
Background
Terylene is the trade name of polyester fiber in China, is an important variety in synthetic fiber, and is fiber prepared by spinning and post-processing fiber-forming high polymer, namely polyethylene terephthalate (PET), which is prepared by esterification reaction or ester exchange reaction and polycondensation reaction of terephthalic acid (PAT) or dimethyl terephthalate (DMT) and Ethylene Glycol (EG) as raw materials. With the continuous improvement of the living standard of human beings, the requirements of people on the quantity and the quality of fiber materials in the application fields of polyester products for clothes, decoration and industry are also continuously improved. In order to meet the demand of people in the fields of clothing, decoration and the like, it is necessary to develop a differentiated fiber having new properties or added values.
The terylene DTY tows for the hollowed-out rhombic fabric can be unevenly deformed under the conditions of high deformation temperature, low stretching, high twist and high speed ratio, so that the hollowed-out effect caused by thickness variation is generated, the fabric has the bamboo joint yarn imitating style, has special hollowed-out rhombic patterns, is bright in color, fine and comfortable in hand feeling and good in drapability, and is mainly used for preparing low-density hollowed-out fabrics such as high-grade female skirts, coats, silk stockings, scarves and the like.
However, the polyester low stretch yarns for the hollowed-out diamond-shaped fabric prepared by the prior art are single in variety, so that the development of the polyester low stretch yarns for the hollowed-out diamond-shaped fabric is limited to a large extent, and meanwhile, polyester molecules do not contain hydrophilic groups and belong to hydrophobic fibers, and active groups capable of being combined with dyes like cellulose or protein fibers are absent in the molecular structure of the polyester low stretch yarns. The finished product of the polyester fiber is a partially crystallized supermolecular structure, molecular chains of the crystallized parts of the polyester fiber are mutually parallel and mostly present a trans conformation, and an amorphous area is mostly present a cis conformation. As known from the molecular structure and crystallization condition of the conventional PET, the molecules are arranged quite tightly, so that the dyeing performance of the conventional PET fiber is poor. Thus, dyeing of conventional PET fibers such as conventional polyester DTY tow is generally done with disperse dyes, usually at high temperature and high pressure. The high-temperature high-pressure dyeing method has high requirements on equipment, long dyeing time and high energy consumption, and can not radically solve the problem of poor dyeing performance of the polyester fiber. The hollow rhombic fabric DTY tows are unevenly deformed under the conditions of high deformation temperature, low stretching, high twist and high speed ratio, so that the hollow effect caused by thickness change is generated, the hollow rhombic fabric DTY has a bamboo joint yarn imitating style, has special hollow rhombic patterns, is bright in color, fine and soft in hand feeling and good in drapability, and is mainly used for low-density hollow fabrics, high-grade female skirts, outerwear, silk stockings, scarves and the like. Meanwhile, the dyeing effect of the conventional polyester DTY tows is poor, so that the accuracy and definition of color patterns on the hollowed-out rhombic fabric prepared by the conventional polyester DTY tows are low, and the requirement of people on the high-quality hollowed-out rhombic fabric is difficult to meet.
Therefore, how to overcome the problems in the prior art and research the terylene low stretch yarn for the hollowed-out rhombic fabric which can dye beautiful dark and light stripes during dyeing and has good dyeing effect has very important significance.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provides the preparation method of the polyester low stretch yarn for the hollowed-out rhombic fabric, which can dye beautiful dark and light stripes during dyeing and has good dyeing effect.
In order to achieve the purpose, the invention adopts the technical scheme that:
according to the preparation method of the polyester low stretch yarn for the hollowed-out rhombic fabric, after the modified polyester POY yarn is prepared from a modified polyester melt according to a POY process, the modified polyester POY yarn is processed according to a DTY process, a groove breaking roller and a variable-frequency yarn shifter are arranged between a zero roller and a first roller of a DTY device, and modified polyester yarn bundles pass through the surface of the groove breaking roller to prepare the polyester low stretch yarn for the hollowed-out rhombic fabric;
the preparation method of the modified polyester comprises the following steps: uniformly mixing terephthalic acid, ethylene glycol and dihydric alcohol with a silicon-containing main chain, and then sequentially carrying out esterification reaction and polycondensation reaction;
the groove breaking roller is a roller with a plurality of annular grooves engraved on the peripheral surface, the annular grooves surround the central shaft of the roller and are distributed at equal intervals along the central shaft of the roller, and the variable-frequency filament transfer device is used for driving the polyester POY filaments to reciprocate along the central shaft of the roller on the peripheral surface of the groove breaking roller;
the diameter of the end face of the groove breaking roller is 80 mm; the distance between two adjacent grooves is 6mm, and the distance between the two grooves on the outermost side in the central axis direction of the roller and the end of the roller closest to the grooves is 3.25 mm; the depth of the grooves is 2.6mm, the width is 4mm, and the number of the grooves is 4; the moving period of the variable-frequency wire moving device is 50-99 reciprocating times/min;
the temperature of a second hot box of the DTY process is 150-170 ℃, the general high stretch yarn which is not heated by the second hot box is high stretch yarn, the general low stretch yarn which is heated by the second hot box is low stretch yarn, and the low stretch yarn is prepared by the method.
According to the invention, the grooved roller and the variable-frequency yarn shifter are additionally arranged in the DTY equipment to prepare the polyester low stretch yarn for the hollowed-out rhombic fabric, so that the defect that the polyester low stretch yarn for the hollowed-out rhombic fabric prepared in the prior art is single in variety is overcome, the surface of the grooved roller is provided with a plurality of annular grooves, and the circumference of the grooved roller in each annular groove is smaller than that of each annular grooveThe circumference of the groove breaking roller outside the groove is larger, so that when the tension of the fiber outside the annular groove is larger than that of the fiber in the annular groove, the stretching multiple of the fiber outside the annular groove is larger (the stretching multiple is controlled to be 1.6-1.8), the stretching multiple of the fiber in the annular groove is smaller (the stretching multiple is controlled to be 1.2-1.3), the variable-frequency filament shifter can drive the polyester POY filament to reciprocate on the circumferential surface of the groove breaking roller along the central shaft of the roller, the stretching multiple of the polyester POY filament is changed instantly, the effect of controlling the change of the thickness segments of the polyester DTY filament is obtained, and the polyester DTY filament is changed in length of different color absorbing segments. The finally prepared terylene low stretch yarn for the hollowed-out diamond-shaped fabric has obvious thick knots and details, one of the characteristics of the terylene low stretch yarn for the hollowed-out diamond-shaped fabric is that the thickness of the yarn bundles has certain difference, a density structure appears in the fabric, and the fabric prepared from the terylene low stretch yarn for the hollowed-out diamond-shaped fabric has excellent air permeability (the moisture permeability of the knitted fabric is 150 plus 170 g/m)2H), meanwhile, the corresponding crystallinity of the thick knots and the thin parts has large difference, so that the dyeing rate of the hollow diamond fabric has large difference, and the fabric made of the hollow diamond fabric by the terylene low stretch yarn can be dyed with beautiful dark and light stripes.
The invention introduces the dihydric alcohol with silicon-containing main chain on the polyester molecular chain to improve the dyeing property of the terylene low stretch yarn for the hollow diamond fabric, on one hand, the high molecular main chain contains-Si-O-Si-bonds, the silicon-oxygen bond gap is larger, the internal rotation activation energy is lower, the atom free rotation is facilitated, the interaction force between the high molecular chain and the chains and the distance between the chains are facilitated to be improved, on the other hand, the Si atom and-CH on the high molecular main chain and the-CH3Is connected to-CH3Perpendicular to the plane of the Si-O-Si atom, the-CH results from the Si-C bond being longer than the C-C bond3Three of H are in a spread state, -CH3Three of the supported H atoms can rotate freely to increase the distance between adjacent Si-O molecular chain segments, and in addition, the inert methyl of the side chain prevents the approach of macromolecules, so that the macromolecule material is very flexible, and the free volume of a cavity is obviously increased compared with the macromolecule material without introducing the dihydric alcohol containing silicon in the main chain. Disperse dyes are a class of dyes that are relatively small in molecule and structurally free of water-soluble groupsMost are in the form of particles with a size of between a few hundred nanometers and a micron. When the modified polyester begins to be dyed, along with the continuous improvement of temperature, because the polyester macromolecular chain contains-Si-O-Si-bonds, the silicon-oxygen bonds are longer than the carbon-oxygen bonds, the internal rotation activation energy is lower, the molecular chain containing the carbon-oxygen bonds starts to move firstly, when the dyeing bath temperature needs to be improved to 120-130 ℃, the intensity of the movement of the macromolecular chains containing the silicon-oxygen bonds is larger than that of the molecular chains containing only the carbon-oxygen bonds, and simultaneously, because the free volume of cavities is larger, the diffusion rate of the granular dye to the interior of the fiber is obviously improved, the free volume of the cavities formed by the macromolecular chains containing the silicon-oxygen bonds is higher than that of the molecular chains containing only the carbon-oxygen bonds, so that water or other molecules such as dye and the like are easier to permeate into the modified polyester macromolecules, the dyeing and the like of the modified polyester can be positively influenced, the dyeing temperature, reduces energy consumption and improves the dye uptake of the fiber.
As a preferred technical scheme:
according to the preparation method of the polyester low-stretch yarn for the hollowed-out diamond fabric, the single-filament fineness of the polyester low-stretch yarn for the hollowed-out diamond fabric is 0.7-1.5 dtex, the crimp shrinkage rate is 10.0 +/-1.0%, the crimp stability is more than or equal to 78%, the linear density deviation rate is less than or equal to 1.2%, the breaking strength is 3.0 +/-0.35 cN/dtex, the breaking strength CV value is less than or equal to 4.0%, the elongation at break is 35.0 +/-3.0%, the elongation at break CV value is less than or equal to 8.0%, the crimp shrinkage variation coefficient CV value is less than or equal to 9.0%, the boiling water shrinkage rate is 2.0 +/-0.5%, and the oil content is 2-3 wt%. Compared with the prior art, the quality and quality of the fiber containing the dihydric alcohol chain segment with the silicon-containing main chain are not reduced, and the modified fiber still has good mechanical property, spinnability and the like.
According to the preparation method of the polyester low stretch yarn for the hollowed-out rhombic fabric, the polyester low stretch yarn for the hollowed-out rhombic fabric is in a bamboo joint shape, and the length of the bamboo joint is 3.1-5.80 pieces/m.
According to the preparation method of the polyester low stretch yarn for the hollowed-out diamond-shaped fabric, the dye-uptake rate of the polyester low stretch yarn for the hollowed-out diamond-shaped fabric at the temperature condition of 130 ℃ is 88.3-91.2%, the K/S (apparent color depth) value is 22.62-25.54, the soaping color fastness (polyester staining and cotton staining) reaches 5 level, the dry rubbing fastness reaches 5 level, and the wet rubbing fastness is higher than 4 level; under the same pressure condition, the dye uptake of a comparison sample under the temperature condition of 130 ℃ is 82.3%, the K/S value is 20.11, the soaping-resistant color fastness is less than grade 5, the polyester staining is grade 4-5, the cotton staining is grade 4, the dry rubbing fastness is grade 4-5, and the wet rubbing fastness is grade 3-4.
The preparation method of the polyester low stretch yarn for the hollowed-out rhombic fabric comprises the following preparation steps of:
(1) performing esterification reaction;
preparing terephthalic acid, ethylene glycol and dihydric alcohol with a silicon-containing main chain into slurry, adding a catalyst, a delustering agent and a stabilizer, uniformly mixing, pressurizing in a nitrogen atmosphere to perform esterification reaction, wherein the pressurizing pressure is normal pressure to 0.3MPa, the esterification reaction temperature is 250-260 ℃, and the esterification reaction end point is determined when the distilled amount of water in the esterification reaction reaches more than 90% of a theoretical value;
(2) performing polycondensation reaction;
and after the esterification reaction is finished, starting the polycondensation reaction in the low vacuum stage under the negative pressure condition, stably pumping the pressure in the low vacuum stage from normal pressure to below 500Pa in 30-50 min at the reaction temperature of 250-260 ℃ for 30-50 min, then continuously pumping the vacuum to perform the polycondensation reaction in the high vacuum stage, so that the reaction pressure is further reduced to below 100Pa, the reaction temperature is 270-275 ℃, and the reaction time is 50-90 min.
According to the preparation method of the terylene low stretch yarn for the hollowed-out rhombic fabric, the molar ratio of the terephthalic acid to the glycol to the diol with the silicon-containing main chain is 1: 1.2-2.0: 0.03-0.05, the addition amount of the diol with the silicon-containing main chain is preferably in the range, so that the modified fiber has good mechanical property and crystallinity, the dyeing property of the fiber can be obviously improved, the production and application of the fiber are facilitated, the addition amount of the diol with the silicon-containing main chain can be properly adjusted according to actual needs, but is not too high, the damage to the regularity of a polyester macromolecular structure is too large due to the excessively high addition amount, the influence on the crystallinity and the mechanical property of the fiber is too large, the production and application of the fiber are not facilitated, the dyeing effect is not obviously improved, and the addition amounts of the catalyst, the flatting agent and the stabilizer are respectively 0.03-0.05 wt% of the addition amount of the terephthalic acid, 0.20 to 0.25 wt% and 0.01 to 0.05 wt% (mass percent).
According to the preparation method of the terylene low stretch yarn for the hollowed-out rhombic fabric, the catalyst is antimony trioxide, ethylene glycol antimony or antimony acetate, the flatting agent is titanium dioxide, and the stabilizer is triphenyl phosphate, trimethyl phosphate or trimethyl phosphite.
According to the preparation method of the polyester low stretch yarn for the hollowed-out rhombic fabric, the number average molecular weight of the modified polyester is 25000-30000, and the molecular weight distribution index is 1.8-2.2.
The preparation method of the polyester low stretch yarn for the hollowed-out rhombic fabric comprises the following steps of: metering, spinneret plate extrusion, cooling, oiling and winding;
the parameters of the POY process are as follows: the spinning temperature is 280-285 ℃, the cooling temperature is 17-20 ℃, and the winding speed is 3200-3600 m/min.
The preparation method of the polyester low stretch yarn for the hollowed-out rhombic fabric comprises the following steps of: carrying out thread guiding, heating and stretching, false twisting, heat setting and winding;
the DTY process has the following parameters: spinning speed is 400-800 m/min, setting overfeed rate is 3.5-5.5%, winding overfeed rate is 3.0-5.5%, temperature of a first hot box is 180-200 ℃, and stretching ratio is 1.6-1.8.
The invention mechanism is as follows:
the invention solves the problem of single variety of the terylene low stretch yarns for the hollow diamond fabric prepared by the prior art and has the following mechanism:
the large molecular chain and the aggregation structural unit of the fiber are stretched in the drafting process of the pre-oriented POY, the orientation degree is improved, high energy can be given to the fiber during drafting, the molecular conformation is continuously changed to a stable state with low energy barrier, the curled macromolecules are gradually straightened, the crystal lattice is easy to lay in, the acting force among the macromolecules is strengthened, the crystal area structure is complete, and finally the crystallinity is increased. In the process of fiber hot drawing, molecular chains compete with each other in orientation, relaxation orientation and crystallization, and products with different orientations and crystal structures can be obtained by reasonably combining drawing temperature and drawing multiple, so that the performances of the products are different.
The invention causes the difference of the stretching multiples of the fiber by additionally arranging the groove breaking roller and the variable-frequency filament transferor in the DTY equipment, the surface of the groove breaking roller is provided with a plurality of annular grooves, the circumference of the groove breaking roller in the annular groove is smaller than that of the groove breaking roller outside the annular groove, so that the fiber is subjected to a larger tension outside the annular groove than in the annular groove, the stretching multiple of the fiber outside the annular groove is larger (the stretching multiple is controlled to be 1.6-1.8), the stretching multiple of the fiber in the annular groove is smaller (the stretching multiple is controlled to be 1.2-1.3), the variable-frequency filament transferor can drive the polyester POY filament to reciprocate along the central shaft of the roller on the circumferential surface of the groove breaking roller, the stretching multiple of the polyester POY filament is changed instantly, the effect of controlling the change of the thickness and fineness of the polyester DTY filament is obtained, and the change of different color absorbing segments of the polyester DTY filament is caused.
The difference of the stretching ratio of the fiber can lead the thickness of the fiber to be regularly changed. With the increase of the drafting multiple, the fineness of the fiber is continuously reduced, the orientation degree of a macromolecular axis is increased, the strength of the fiber is increased, the elongation is reduced, the initial modulus is improved, the crystallinity is increased, the dyed fiber has color which is presented by the fact that the dye contained in the fiber selectively absorbs visible light and reflects the visible light or transmits complementary color of absorbed light, the depth of the color is related to the strength of the fiber in reflection and scattering of the light, the smaller the fineness of the fiber is, the thinner the fiber is, the larger the specific surface area of the fiber is, the stronger the reflection of the surface of the fiber is, the less the light enters the fiber, and the weaker the light reflected or transmitted by the fiber after being absorbed is, the lighter the color of the fiber is; therefore, the fine portion has a large degree of crystallinity and orientation, and the apparent color depth after dyeing is low; the coarse part has small crystallinity and orientation degree, the dyed apparent color has high depth, so that the fibers have the phenomena of different titer and different dyeing rate, the fabric has stronger stereoscopic impression, disordered and irregular patterns, is natural and attractive, has good coarse and spacious wearing performance, and meets the diversified requirements;
the invention solves the problem of poor dyeing effect of the polyester low stretch yarn for the hollowed-out diamond-shaped fabric prepared by the prior art by the following mechanism:
the macromolecular chains in the polymer are not completely tightly packed, and voids always exist among the macromolecular chains, and the void volume is the free volume. Since small molecules are allowed to penetrate into the polymer, voids are sufficiently large in the polymer or between the polymers, the permeability and diffusivity of the small molecules are related to the size of the voids (i.e., the size of free volume) in the polymer structure, and within a certain range, the larger the size of the free volume, the higher the permeability of the small molecules, and the better the diffusivity. The free volume is divided into a cavity free volume and a slit free volume, the cavity free volume has larger space size than the slit free volume, and the effect of the cavity free volume is more obvious than the effect of the slit free volume for improving the permeability of small molecules.
The size and type of free volume depends primarily on the structure of the polymer, and the primary factors affecting the polymer structure are steric hindrance, pendant group size, pendant group structure, and the like. When a certain position on the main chain of the polymer is substituted by a side group, the activity of the main chain is inevitably changed, so that the interaction force between chains is changed, the distance between the chains is also correspondingly changed, and consequently, the cohesive energy and the free volume are changed, and the polarity, the size, the length and the like of the substituent on the side chain of the polymer have certain influences on the rigidity of the molecular chain, the interaction between molecules and the free volume fraction of the polymer structure, so that the effects generated by different substituents are different, and the osmotic separation performance of the polymer is often different.
The dyeing property of the terylene low stretch yarn for the hollow diamond fabric is remarkably improved by introducing the dihydric alcohol with silicon-containing main chain into a polyester molecular chain, wherein the dihydric alcohol with silicon-containing main chain is dimethyl silicon glycol, dimethyl diphenyl disiloxane glycol or tetramethyl disiloxane glycol, and the structural formulas are respectively as follows:
the rigidity of the high molecular chain is determined by the size of a rotation potential barrier in the molecular chain, the main chain structures are different, wherein the bond angles and bond lengths are different or the bonding modes are different, the rigidity is also different, after the diatomic alcohol with silicon in the main chain is introduced, the high molecular main chain contains-Si-O-Si-bonds, the silicon-oxygen bond gaps are larger, the internal rotation activation energy is lower, the free rotation of atoms is facilitated, and meanwhile, the Si atoms and-CH on the high molecular main chain3Is connected to-CH3Perpendicular to the plane of the Si-O-Si atom, the-CH results from the Si-C bond being longer than the C-C bond3Three of H are in a spread state, -CH3Three propped H atoms in the polymer material can freely rotate to increase the distance between adjacent Si-O molecular chain segments, and in addition, the inert methyl of the side chain blocks the approach of the high polymer, so that the high polymer material is very flexible, and the free volume of the cavity is obviously increased compared with the high polymer material without introducing the dihydric alcohol containing silicon in the main chain; when the Si atom on the main chain of the macromolecule is connected with the long branched chain substituent, the slit free volume is mainly increased, the increase amplitude is small, the improvement effect on the permeability and the diffusivity of the micromolecule is limited, and meanwhile, the long branched chain substituent has low rigidity, the molecular chains are easy to tangle, and the increase of the free volume is not facilitated. The increase of the free volume of the cavity enables water or other molecules such as dye to be easier to permeate into the modified polyester macromolecules, has positive influence on the dyeing of the modified polyester and the like, can reduce the dyeing temperature, shorten the dyeing time, reduce the energy consumption and simultaneously improve the dye uptake of the fiber.
In addition, the oxidation degradation and hydrolysis rate of the high polymer material are closely related to the rate of oxygen permeation into the material, the rigidity of the macromolecular structure of the polyester is high, the free volume fraction is low, the oxygen permeation rate is very low, the oxidation and hydrolysis of the polyester in the natural environment are mainly carried out on the surface of the polyester, which is one of the main reasons for the slow degradation of the polyester in the natural environment, the increase of the free volume of the space is also beneficial to the permeation of oxygen into the polyester macromolecules, and further the oxidation degradation and hydrolysis rate of the polyester is further beneficial to improvement.
The dyeing effect of the hollowed-out rhombic fabric is poor due to the lack of active groups combined with dye molecules, the tight arrangement of molecular chains, the difficulty in permeation of the dye molecules into the interior of the fiber and the like of the conventional polyester fiber in the prior art, and the accuracy and the precision of the colored pattern on the hollowed-out rhombic fabric are low.
Has the advantages that:
(1) according to the preparation method of the polyester low stretch yarn for the hollowed-out diamond-shaped fabric, disclosed by the invention, the diatomic alcohol with a specific structure and silicon-containing main chain is introduced into a polyester molecular chain, so that the cavity free volume of polyester is increased, small dye molecules can easily permeate into the polyester, the dyeing performance of the polyester low stretch yarn is improved, the dyeing rate and the color fastness of the polyester low stretch yarn are improved, and the dyeing quality of the hollowed-out diamond-shaped fabric can be further improved;
(2) according to the preparation method of the polyester low stretch yarn for the hollowed-out rhombic fabric, disclosed by the invention, the diatomic alcohol with a silicon-containing main chain and a specific structure is introduced into a polyester molecular chain, so that the cavity free volume of the polyester is increased, water and oxygen-containing micromolecules can easily permeate into the polyester to carry out oxidative degradation and hydrolysis on the polyester, the degradability of the fiber is improved to a certain extent, and the polyester fiber is favorably recycled;
(3) the preparation method of the polyester low stretch yarn for the hollowed-out rhombic fabric is simple to operate, and only polyester is modified, a groove breaking roller and a variable frequency yarn shifter are additionally arranged in a DTY (draw texturing yarn) device, and the yarn bundle is controlled to pass through the surface of the groove breaking roller along a specific direction at a specific frequency;
(4) according to the preparation method of the polyester low stretch yarn for the hollowed-out diamond-shaped fabric, provided by the invention, the polyester low stretch yarn for the hollowed-out diamond-shaped fabric, which has clear nubs and details, excellent air permeability and excellent dyeing effect and can be dyed with beautiful dark and light stripes when dyed by the same dye bath, can be prepared.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Example 1
The preparation method of the polyester low stretch yarn for the hollowed-out rhombic fabric comprises the following steps:
(1) preparing modified polyester;
(1.1) esterification reaction;
preparing terephthalic acid, ethylene glycol and dimethyl silicon glycol into slurry, adding antimony trioxide, titanium dioxide and triphenyl phosphate, uniformly mixing, pressurizing in a nitrogen atmosphere to perform esterification reaction, wherein the pressurizing pressure is 0.3MPa, the esterification reaction temperature is 250 ℃, and the esterification reaction endpoint is when the distilled amount of water in the esterification reaction reaches 95 of a theoretical value, wherein the molar ratio of the terephthalic acid to the ethylene glycol to the dimethyl silicon glycol is 1:1.2:0.05, and the adding amounts of the antimony trioxide, the titanium dioxide and the triphenyl phosphate are respectively 0.03 wt%, 0.22 wt% and 0.02 wt% of the adding amount of the terephthalic acid;
(1.2) polycondensation reaction;
after the esterification reaction is finished, starting the polycondensation reaction in a low vacuum stage under the condition of negative pressure, wherein the pressure in the stage is stably pumped from normal pressure to absolute pressure of 490Pa within 30min, the reaction temperature is 252 ℃, the reaction time is 35min, then continuing to pump vacuum, and carrying out the polycondensation reaction in a high vacuum stage, so that the reaction pressure is further reduced to absolute pressure of 100Pa, the reaction temperature is 270 ℃, the reaction time is 50min, and the number average molecular weight of the prepared modified polyester is 25000 and the molecular weight distribution index is 1.8;
(2) preparing modified polyester POY (polyester pre-oriented yarn);
the modified polyester POY is obtained after the modified polyester melt is subjected to metering, spinneret plate extrusion, cooling, oiling and winding, and the parameters of the POY process are as follows: the spinning temperature is 285 ℃, the cooling temperature is 17 ℃, and the winding speed is 3500 m/min;
(3) preparing terylene low stretch yarn for the hollowed-out diamond-shaped fabric;
the DTY equipment for the polyester DTY process comprises a raw silk frame, a filament cutter, a zero roller, a variable-frequency filament shifter, a groove breaking roller, a first roller, a slide rail, a first hot box, a cooling plate, a false twister, a tension meter, a second roller, a network nozzle, a second hot box, a third roller, an oil wheel and a winder, wherein the groove breaking roller is a roller with a plurality of annular grooves engraved on the peripheral surface, the annular grooves surround the central shaft of the roller and are distributed at equal intervals along the central shaft of the roller, the variable-frequency filament shifter is used for driving modified polyester POY filaments to reciprocate on the peripheral surface of the groove breaking roller along the central shaft of the roller, and the diameter of the end surface of the groove breaking roller is 80 mm; the distance between two adjacent grooves is 6mm, and the distance between the two grooves on the outermost side in the central axis direction of the roller and the end of the roller closest to the grooves is 3.25 mm; the depth of the grooves is 2.6mm, the width is 4mm, and the number of the grooves is 4;
the modified polyester POY yarn on the original yarn frame is guided out by a yarn guide pipe and then sequentially passes through a yarn cutter, a zero roller, a variable frequency yarn moving device, the surface of a groove breaking roller, a first hot box, a cooling plate, a false twister, a tension meter, a second roller, a network nozzle, a second hot box, a third roller, an oil wheel and a winder to complete the processes of yarn guide, plying, network, heating and stretching, false twisting, heat setting and winding, namely the DTY process is completed to obtain the hollow diamond-shaped polyester low stretch yarn for the fabric, wherein the moving period of the variable frequency yarn moving device is 99 reciprocating times/min, and the parameters of the DTY process are as follows: the spinning speed is 400m/min, the setting overfeed rate is 3.5 percent, the winding overfeed rate is 4.0 percent, the first hot box temperature is 190 ℃, the second hot box temperature is 170 ℃, and the drawing ratio is 1.7.
The single-filament fineness of the prepared polyester low-stretch yarn for the hollowed-out diamond fabric is 0.9dtex, the crimp shrinkage rate is 11.0%, the crimp stability is 79%, the linear density deviation rate is 1.1%, the breaking strength is 2.75cN/dtex, the breaking strength CV value is 3.7%, the elongation at break is 33.0%, the elongation at break CV value is 7.9%, the crimp shrinkage rate variation coefficient CV value is 8.8%, the boiling water shrinkage rate is 2.0%, the oil content is 2 wt%, the polyester low-stretch yarn for the hollowed-out diamond fabric is in a bamboo joint shape, and the bamboo joint length is 3.1 pieces/m.
The dye uptake of the polyester low stretch yarn for the hollowed-out diamond fabric at the temperature of 130 ℃ is 88.3%, the K/S value is 22.62, the soaping-resistant color fastness reaches 5 grade, the dry rubbing fastness reaches 5 grade, and the wet rubbing fastness reaches 5 grade.
Comparative example 1
The preparation method of the polyester low stretch yarn for the hollowed-out diamond fabric is basically the same as that in the embodiment 1, and is different from the step that polyester is not modified, the single-filament fineness of the prepared polyester low stretch yarn for the hollowed-out diamond fabric is 0.9dtex, the crimp shrinkage is 10.0%, the crimp stability is 75%, the linear density deviation rate is 1.1%, the breaking strength is 2.82cN/dtex, the breaking strength CV value is 3.7%, the elongation at break is 32.0%, the elongation at break CV value is 7.9%, the crimp shrinkage variation coefficient CV value is 8.8%, the boiling water shrinkage is 2.2%, the oil content is 2.0 wt%, the polyester low stretch yarn for the hollowed-out diamond fabric is in a bamboo joint shape, and the bamboo joint length is 3.1/m; under the same pressure condition as that of example 1, the dye uptake rate of the polyester is 85.0 percent under the temperature condition of 130 ℃, the K/S value is 20.61, the soaping-resistant color fastness is 4-5 grades, the polyester staining is 4-5 grades, the cotton staining is 4 grades, the dry rubbing fastness is 4-5 grades, and the wet rubbing fastness is 3-4 grades. The two comparisons show that the dyeing property of the polyester fiber is greatly improved by modifying the polyester, and the mechanical property is not influenced.
Comparative example 2
The preparation method of the polyester low stretch yarn for the hollowed-out diamond-shaped fabric is basically the same as that in the embodiment 1, and is characterized in that 1, 6-hexanediol is adopted to replace dimethyl silicon glycol in the step (1), the single-filament number of the prepared polyester low stretch yarn for the hollowed-out diamond-shaped fabric is 0.9dtex, the crimp shrinkage rate is 11.0%, the crimp stability is 76%, the linear density deviation rate is 1.1%, the breaking strength is 2.84cN/dtex, the breaking strength CV value is 3.7%, the elongation at break is 31.6%, the elongation at break CV value is 7.9%, the crimp shrinkage variation coefficient CV value is 8.8%, the boiling water shrinkage rate is 2.2%, the oil content is 2.0 wt%, the polyester low stretch yarn for the hollowed-out diamond-shaped fabric is in a slub shape, and the slub length is 3.1/m; under the same pressure condition as that of the example 1, the dye uptake rate of the polyester is 85.6 percent under the temperature condition of 130 ℃, the K/S value is 20.87, the soaping fastness is 4-5 grade, the polyester staining is 4 grade, the cotton staining is 4 grade, the dry rubbing fastness is 4 grade, the wet rubbing fastness is 4 grade, and the dye uptake rate is lower than that of the polyester/cotton blended yarn.
Compared with the embodiment 1, the introduction of the dihydric alcohol (dimethyl silicon glycol) with silicon in the main chain enables the main chain of the macromolecule to contain-Si-O-Si-bonds, so that the silicon-oxygen bond gap is larger, the internal rotation activation energy is lower, and the free rotation of atoms is facilitated, so that the free volume of cavities is increased, and the dyeing property of the fiber is more facilitated compared with that of a long branched chain substituent.
Comparative example 3
The preparation method of the polyester low stretch yarn for the hollowed-out rhombic fabric is basically the same as that in the embodiment 1, and is different in that DTY equipment adopted in the preparation of the polyester yarn does not contain a variable frequency yarn shifter and a groove breaking roller. The finally prepared polyester yarn is the conventional polyester DTY yarn and is not bamboo-like, and comparing the example 1 with the comparative example 1 shows that the invention can prepare the bamboo-like DTY yarn just under the action of the variable-frequency yarn shifter and the groove breaking roller.
Example 2
The preparation method of the polyester low stretch yarn for the hollowed-out rhombic fabric comprises the following steps:
(1) preparing modified polyester;
(1.1) esterification reaction;
preparing terephthalic acid, ethylene glycol and dimethyl diphenyl disiloxane glycol into slurry, adding antimony trioxide, titanium dioxide and trimethyl phosphate, uniformly mixing, pressurizing in a nitrogen atmosphere to perform esterification reaction, wherein the pressurizing pressure is 0.2MPa, the esterification reaction temperature is 252 ℃, and the end point of the esterification reaction is when the distilled amount of water in the esterification reaction reaches 90% of a theoretical value, wherein the molar ratio of the terephthalic acid to the ethylene glycol to the dimethyl diphenyl disiloxane glycol is 1:1.2:0.03, and the adding amounts of the antimony trioxide to the titanium dioxide to the trimethyl phosphate are 0.04 wt%, 0.20 wt% and 0.04 wt% of the adding amount of the terephthalic acid respectively;
(1.2) polycondensation reaction;
after the esterification reaction is finished, starting the polycondensation reaction in a low vacuum stage under the negative pressure condition, smoothly pumping the pressure in the stage from normal pressure to absolute pressure of 420Pa within 35min, controlling the reaction temperature to be 255 ℃ and the reaction time to be 40min, then continuing to pump vacuum, and carrying out the polycondensation reaction in a high vacuum stage to further reduce the reaction pressure to absolute pressure of 95Pa, control the reaction temperature to be 271 ℃ and control the reaction time to be 55min, wherein the number average molecular weight of the prepared modified polyester is 26300 and the molecular weight distribution index is 2.2;
(2) preparing modified polyester POY (polyester pre-oriented yarn);
the modified polyester POY is obtained after the modified polyester melt is subjected to metering, spinneret plate extrusion, cooling, oiling and winding, and the parameters of the POY process are as follows: the spinning temperature is 280 ℃, the cooling temperature is 17 ℃, and the winding speed is 3200 m/min;
(3) preparing terylene low stretch yarn for the hollowed-out diamond-shaped fabric;
the modified polyester POY yarn is prepared into the hollow diamond-shaped polyester low stretch yarn for the fabric by adopting DTY equipment with the same structure as that in the embodiment 1 and through the DTY process flow basically same as that in the embodiment 1, and the DTY process is different from the embodiment 1 in that the moving period of the variable frequency yarn shifter is 5 reciprocating times/min, and the DTY process has the following parameters: the spinning speed is 400m/min, the setting overfeed rate is 5.5 percent, the winding overfeed rate is 3.0 percent, the temperature of the first hot box is 180 ℃, the temperature of the second hot box is 160 ℃, and the drawing ratio is 1.65.
The produced terylene low stretch yarn for the hollow diamond fabric has the filament number of 0.7dtex, the crimp shrinkage of 10.0 percent, the crimp stability of 81 percent, the linear density deviation rate of 1.2 percent, the breaking strength of 3.35cN/dtex, the breaking strength CV value of 4.0 percent, the elongation at break of 35.0 percent, the elongation at break CV value of 7.4 percent, the crimp shrinkage variation coefficient CV value of 8.9 percent, the boiling water shrinkage of 1.8 percent and the oil content of 2 percent by weight, is in a bamboo joint shape, and has the bamboo joint length of 5.80 pieces/m.
The dye uptake of the polyester low stretch yarn for the hollowed-out diamond fabric at the temperature of 130 ℃ is 88.3%, the K/S value is 25.54, the soaping-resistant color fastness reaches 5 grade, the dry rubbing fastness reaches 5 grade, and the wet rubbing fastness reaches 5 grade.
Example 3
The preparation method of the polyester low stretch yarn for the hollowed-out rhombic fabric comprises the following steps:
(1) preparing modified polyester;
(1.1) esterification reaction;
preparing terephthalic acid, ethylene glycol and tetramethyldisiloxane glycol into slurry, adding ethylene glycol antimony, titanium dioxide and trimethyl phosphite, uniformly mixing, pressurizing in a nitrogen atmosphere to perform esterification reaction, wherein the pressurizing pressure is 0.1MPa, the esterification reaction temperature is 255 ℃, the esterification reaction endpoint is the time point when the water distillate in the esterification reaction reaches 92% of a theoretical value, the molar ratio of the terephthalic acid to the ethylene glycol to the tetramethyldisiloxane glycol is 1:1.5:0.03, and the adding amounts of the ethylene glycol antimony, the titanium dioxide and the trimethyl phosphite are respectively 0.05 wt%, 0.24 wt% and 0.01 wt% of the adding amount of the terephthalic acid;
(1.2) polycondensation reaction;
after the esterification reaction is finished, starting the polycondensation reaction in a low vacuum stage under the condition of negative pressure, stably pumping the pressure in the stage from normal pressure to the absolute pressure of 500Pa within 45min, controlling the reaction temperature to be 256 ℃ and the reaction time to be 30min, then continuously pumping the vacuum to perform the polycondensation reaction in a high vacuum stage, further reducing the reaction pressure to the absolute pressure of 96Pa, controlling the reaction temperature to be 273 ℃ and the reaction time to be 60min, wherein the number average molecular weight of the prepared modified polyester is 25800 and the molecular weight distribution index is 2.0;
(2) preparing modified polyester POY (polyester pre-oriented yarn);
the modified polyester POY is obtained after the modified polyester melt is subjected to metering, spinneret plate extrusion, cooling, oiling and winding, and the parameters of the POY process are as follows: the spinning temperature is 285 ℃, the cooling temperature is 20 ℃, and the winding speed is 3600 m/min;
(3) preparing terylene low stretch yarn for the hollowed-out diamond-shaped fabric;
the modified polyester POY yarn is prepared into the hollow diamond-shaped polyester low stretch yarn for the fabric by adopting DTY equipment with the same structure as that in the embodiment 1 and through the DTY process flow basically same as that in the embodiment 1, and the DTY process is different from the embodiment 1 in that the moving period of the variable frequency yarn shifter is 15 reciprocating times/min, and the DTY process has the following parameters: the spinning speed is 500m/min, the setting overfeed rate is 3.5 percent, the winding overfeed rate is 3.0 percent, the temperature of the first hot box is 180 ℃, the temperature of the second hot box is 150 ℃, and the drawing ratio is 1.8.
The produced terylene low stretch yarn for the hollow diamond fabric has the filament number of 0.7dtex, the crimp shrinkage of 9.0 percent, the crimp stability of 83 percent, the linear density deviation rate of 1.1 percent, the breaking strength of 2.65cN/dtex, the breaking strength CV value of 3.95 percent, the elongation at break of 32.0 percent, the elongation at break CV value of 7.6 percent, the variation coefficient CV value of the crimp shrinkage of 9.0 percent, the boiling water shrinkage of 2.0 percent and the oil content of 2.2 percent by weight, is in a bamboo joint shape, and the bamboo joint length of 3.1 pieces/m.
The dye uptake of the polyester low stretch yarn for the hollowed-out diamond fabric at the temperature of 130 ℃ is 89.5%, the K/S value is 22.62, the soaping-resistant color fastness reaches 5 grade, the dry rubbing fastness reaches 5 grade, and the wet rubbing fastness reaches 6 grade.
Example 4
The preparation method of the polyester low stretch yarn for the hollowed-out rhombic fabric comprises the following steps:
(1) preparing modified polyester;
(1.1) esterification reaction;
preparing terephthalic acid, ethylene glycol and dimethyl silicon glycol into slurry, adding ethylene glycol antimony titanium dioxide and triphenyl phosphate, uniformly mixing, pressurizing in a nitrogen atmosphere to perform esterification reaction, wherein the pressurizing pressure is 0.1MPa, the esterification reaction temperature is 250 ℃, the esterification reaction endpoint is when the water distillate in the esterification reaction reaches 95% of a theoretical value, the molar ratio of the terephthalic acid to the ethylene glycol to the dimethyl silicon glycol is 1:1.7:0.04, and the adding amounts of the ethylene glycol antimony, the titanium dioxide and the triphenyl phosphate are respectively 0.04 wt%, 0.25 wt% and 0.03 wt% of the adding amount of the terephthalic acid;
(1.2) polycondensation reaction;
after the esterification reaction is finished, starting the polycondensation reaction in a low vacuum stage under the condition of negative pressure, stably pumping the pressure in the stage from normal pressure to absolute pressure of 440Pa within 40min, controlling the reaction temperature to be 260 ℃ and the reaction time to be 40min, then continuing to pump vacuum, and carrying out the polycondensation reaction in a high vacuum stage to further reduce the reaction pressure to absolute pressure of 99Pa, control the reaction temperature to be 273 ℃ and control the reaction time to be 75min, wherein the number average molecular weight of the prepared modified polyester is 27000 and the molecular weight distribution index is 1.9;
(2) preparing modified polyester POY (polyester pre-oriented yarn);
the modified polyester POY is obtained after the modified polyester melt is subjected to metering, spinneret plate extrusion, cooling, oiling and winding, and the parameters of the POY process are as follows: the spinning temperature is 282 ℃, the cooling temperature is 20 ℃, and the winding speed is 3500 m/min;
(3) preparing terylene low stretch yarn for the hollowed-out diamond-shaped fabric;
the modified polyester POY yarn is prepared into the hollow diamond-shaped polyester low stretch yarn for the fabric by adopting DTY equipment with the same structure as that in the embodiment 1 and through the DTY process flow basically same as that in the embodiment 1, and the DTY process is different from the embodiment 1 in that the moving period of the variable frequency yarn shifter is 25 reciprocating times/min, and the DTY process has the following parameters: the spinning speed is 600m/min, the setting overfeed rate is 4.5 percent, the winding overfeed rate is 5.5 percent, the temperature of the first hot box is 200 ℃, the temperature of the second hot box is 150 ℃, and the drawing ratio is 1.6.
The single-filament fineness of the prepared polyester low-stretch yarn for the hollowed-out diamond fabric is 1.5dtex, the crimp shrinkage rate is 9.0%, the crimp stability is 78%, the linear density deviation rate is 1.0%, the breaking strength is 3.0cN/dtex, the breaking strength CV value is 3.5%, the elongation at break is 38.0%, the elongation at break CV value is 8.0%, the crimp shrinkage rate variation coefficient CV value is 8.5%, the boiling water shrinkage rate is 2.5%, the oil content is 2.6 wt%, the polyester low-stretch yarn for the hollowed-out diamond fabric is in a bamboo joint shape, and the bamboo joint length is 4.3 pieces/m.
The dye uptake of the polyester low stretch yarn for the hollowed-out diamond fabric at the temperature of 130 ℃ is 90.3%, the K/S value is 24.55, the soaping-resistant color fastness reaches 5 grade, the dry rubbing fastness reaches 5 grade, and the wet rubbing fastness reaches 6 grade.
Example 5
The preparation method of the polyester low stretch yarn for the hollowed-out rhombic fabric comprises the following steps:
(1) preparing modified polyester;
(1.1) esterification reaction;
preparing terephthalic acid, ethylene glycol and dimethyl diphenyl disiloxane glycol into slurry, adding antimony acetate, titanium dioxide and trimethyl phosphate, uniformly mixing, pressurizing in a nitrogen atmosphere to perform esterification reaction, wherein the pressurizing pressure is normal pressure, the esterification reaction temperature is 260 ℃, and the esterification reaction endpoint is when the water distillate in the esterification reaction reaches 91% of a theoretical value, wherein the molar ratio of the terephthalic acid to the ethylene glycol to the dimethyl diphenyl disiloxane glycol is 1:2.0:0.04, and the adding amounts of the antimony acetate to the titanium dioxide to the trimethyl phosphate are respectively 0.03 wt%, 0.25 wt% and 0.01 wt% of the adding amount of the terephthalic acid;
(1.2) polycondensation reaction;
after the esterification reaction is finished, starting the polycondensation reaction in a low vacuum stage under the negative pressure condition, stably pumping the pressure in the stage from normal pressure to absolute pressure of 490Pa within 50min, at the reaction temperature of 258 ℃ for 35min, then continuing to pump vacuum, and carrying out the polycondensation reaction in a high vacuum stage, so that the reaction pressure is further reduced to absolute pressure of 100Pa, the reaction temperature is 274 ℃, the reaction time is 80min, and the number average molecular weight of the prepared modified polyester is 28000 and the molecular weight distribution index is 2.1;
(2) preparing modified polyester POY (polyester pre-oriented yarn);
the modified polyester POY is obtained after the modified polyester melt is subjected to metering, spinneret plate extrusion, cooling, oiling and winding, and the parameters of the POY process are as follows: the spinning temperature is 280 ℃, the cooling temperature is 17 ℃, and the winding speed is 3200 m/min;
(3) preparing terylene low stretch yarn for the hollowed-out diamond-shaped fabric;
the modified polyester POY yarn is prepared into the hollow diamond-shaped polyester low stretch yarn for the fabric by adopting DTY equipment with the same structure as that in the embodiment 1 and through the DTY process flow basically same as that in the embodiment 1, and the DTY process is different from the embodiment 1 in that the moving period of the variable frequency yarn shifter is 50 reciprocating times/min, and the DTY process has the following parameters: the spinning speed is 800m/min, the setting overfeed rate is 4.0 percent, the winding overfeed rate is 4.5 percent, the temperature of the first hot box is 195 ℃, the temperature of the second hot box is 170 ℃, and the drawing ratio is 1.6.
The single-filament fineness of the prepared polyester low-stretch yarn for the hollowed-out diamond fabric is 1.2dtex, the crimp shrinkage rate is 11.0%, the crimp stability is 78%, the linear density deviation rate is 1.2%, the breaking strength is 2.90cN/dtex, the breaking strength CV value is 3.7%, the elongation at break is 32.0%, the elongation at break CV value is 7.6%, the crimp shrinkage rate variation coefficient CV value is 9.0%, the boiling water shrinkage rate is 1.5%, the oil content is 3 wt%, the polyester low-stretch yarn for the hollowed-out diamond fabric is in a bamboo joint shape, and the bamboo joint length is 4.9 pieces/m.
The dye uptake of the terylene low stretch yarn for the hollow diamond fabric at the temperature of 130 ℃ is 91.2%, the K/S value is 23.96, the soaping-resistant color fastness reaches 5 grade, the dry friction fastness reaches 5 grade, and the wet friction fastness reaches 6 grade.
Example 6
The preparation method of the polyester low stretch yarn for the hollowed-out rhombic fabric comprises the following steps:
(1) preparing modified polyester;
(1.1) esterification reaction;
preparing terephthalic acid, ethylene glycol and tetramethyl disiloxane glycol into slurry, adding antimony acetate, titanium dioxide and trimethyl phosphite, uniformly mixing, pressurizing in a nitrogen atmosphere to perform esterification reaction, wherein the pressurizing pressure is normal pressure, the esterification reaction temperature is 254 ℃, the esterification reaction endpoint is when the water distillation amount in the esterification reaction reaches 94% of a theoretical value, the molar ratio of the terephthalic acid to the ethylene glycol to the tetramethyl disiloxane glycol is 1:2.0:0.05, and the adding amounts of the antimony acetate to the titanium dioxide to the trimethyl phosphite are respectively 0.04 wt%, 0.20 wt% and 0.05 wt% of the adding amount of the terephthalic acid;
(1.2) polycondensation reaction;
after the esterification reaction is finished, starting the polycondensation reaction in a low vacuum stage under the condition of negative pressure, stably pumping the pressure in the stage from normal pressure to absolute pressure of 450Pa within 35min, controlling the reaction temperature to be 250 ℃ and the reaction time to be 50min, then continuing to pump vacuum, and carrying out the polycondensation reaction in a high vacuum stage to further reduce the reaction pressure to absolute pressure of 100Pa, control the reaction temperature to be 275 ℃ and control the reaction time to be 85min, wherein the number average molecular weight of the prepared modified polyester is 29000 and the molecular weight distribution index is 1.9;
(2) preparing modified polyester POY (polyester pre-oriented yarn);
the modified polyester POY is obtained after the modified polyester melt is subjected to metering, spinneret plate extrusion, cooling, oiling and winding, and the parameters of the POY process are as follows: the spinning temperature is 283 ℃, the cooling temperature is 20 ℃, and the winding speed is 3600 m/min;
(3) preparing terylene low stretch yarn for the hollowed-out diamond-shaped fabric;
the modified polyester POY yarn is prepared into the hollow diamond-shaped polyester low stretch yarn for the fabric by adopting DTY equipment with the same structure as that in the embodiment 1 and through the DTY process flow basically same as that in the embodiment 1, and the DTY process is different from the embodiment 1 in that the moving period of the variable frequency yarn shifter is 75 reciprocating times/min, and the DTY process has the following parameters: the spinning speed is 800m/min, the setting overfeed rate is 5.5 percent, the winding overfeed rate is 5.5 percent, the temperature of the first hot box is 200 ℃, the temperature of the second hot box is 160 ℃, and the drawing ratio is 1.6.
The single-filament fineness of the prepared polyester low-stretch yarn for the hollowed-out diamond fabric is 1.5dtex, the crimp shrinkage rate is 11.0%, the crimp stability is 79%, the linear density deviation rate is 1.1%, the breaking strength is 3.05cN/dtex, the breaking strength CV value is 4.0%, the elongation at break is 34.0%, the elongation at break CV value is 8.0%, the crimp shrinkage rate variation coefficient CV value is 9.0%, the boiling water shrinkage rate is 2.0%, the oil content is 3 wt%, the polyester low-stretch yarn for the hollowed-out diamond fabric is in a bamboo joint shape, and the bamboo joint length is 5.80 pieces/m.
The dye uptake of the polyester low stretch yarn for the hollowed-out diamond fabric at the temperature of 130 ℃ is 91.2%, the K/S value is 25.54, the soaping-resistant color fastness reaches 5 grade, the dry rubbing fastness reaches 5 grade, and the wet rubbing fastness reaches 5 grade.
Example 7
The preparation method of the polyester low stretch yarn for the hollowed-out rhombic fabric comprises the following steps:
(1) preparing modified polyester;
(1.1) esterification reaction;
preparing terephthalic acid, ethylene glycol and tetramethyl disiloxane glycol into slurry, adding antimony trioxide, titanium dioxide and trimethyl phosphate, uniformly mixing, pressurizing in a nitrogen atmosphere to perform esterification reaction, wherein the pressurizing pressure is 0.3MPa, the esterification reaction temperature is 260 ℃, and the esterification reaction endpoint is when the distilled amount of water in the esterification reaction reaches 99% of a theoretical value, wherein the molar ratio of the terephthalic acid to the ethylene glycol to the tetramethyl disiloxane glycol is 1:1.3:0.03, and the adding amounts of the antimony trioxide to the titanium dioxide to the trimethyl phosphate are 0.04 wt%, 0.21 wt% and 0.01 wt% of the adding amount of the terephthalic acid respectively;
(1.2) polycondensation reaction;
after the esterification reaction is finished, starting the polycondensation reaction in a low vacuum stage under the condition of negative pressure, stably pumping the pressure in the stage from normal pressure to the absolute pressure of 500Pa within 45min, controlling the reaction temperature to be 250 ℃ and the reaction time to be 50min, then continuing to pump vacuum, and carrying out the polycondensation reaction in a high vacuum stage, so that the reaction pressure is further reduced to the absolute pressure of 90Pa, the reaction temperature is 277 ℃, the reaction time is 90min, and the number average molecular weight of the prepared modified polyester is 30000 and the molecular weight distribution index is 1.8;
(2) preparing modified polyester POY (polyester pre-oriented yarn);
the modified polyester POY is obtained after the modified polyester melt is subjected to metering, spinneret plate extrusion, cooling, oiling and winding, and the parameters of the POY process are as follows: the spinning temperature is 280 ℃, the cooling temperature is 20 ℃, and the winding speed is 3500 m/min;
(3) preparing terylene low stretch yarn for the hollowed-out diamond-shaped fabric;
the modified polyester POY yarn is prepared into the hollow diamond-shaped polyester low stretch yarn for the fabric by adopting DTY equipment with the same structure as that in the embodiment 1 and through the DTY process flow basically same as that in the embodiment 1, and the DTY process is different from the embodiment 1 in that the moving period of the variable frequency yarn shifter is 90 reciprocating times/min, and the DTY process has the following parameters: the spinning speed is 700m/min, the setting overfeed rate is 3.5 percent, the winding overfeed rate is 5.0 percent, the temperature of the first hot box is 180 ℃, the temperature of the second hot box is 155 ℃, and the drawing ratio is 1.8.
The single-filament fineness of the prepared polyester low-stretch yarn for the hollowed-out diamond fabric is 1.0dtex, the crimp shrinkage rate is 9.0%, the crimp stability is 80%, the linear density deviation rate is 1.2%, the breaking strength is 3.0cN/dtex, the breaking strength CV value is 3.6%, the elongation at break is 35.0%, the elongation at break CV value is 7.9%, the crimp shrinkage rate variation coefficient CV value is 8.4%, the boiling water shrinkage rate is 2.5%, the oil content is 2.8 wt%, the polyester low-stretch yarn for the hollowed-out diamond fabric is in a bamboo joint shape, and the bamboo joint length is 3.1 pieces/m.
The dye uptake of the polyester low stretch yarn for the hollowed-out diamond fabric at the temperature of 130 ℃ is 90.8%, the K/S value is 22.62, the soaping-resistant color fastness reaches 5 grade, the dry rubbing fastness reaches 5 grade, and the wet rubbing fastness reaches 5 grade.
Claims (10)
1. The preparation method of the terylene low stretch yarn for the hollowed-out rhombic fabric is characterized by comprising the following steps: preparing modified polyester POY yarns from the modified polyester melt according to a POY process, processing the modified polyester POY yarns according to a DTY process, arranging a groove breaking roller and a variable-frequency yarn shifter between a zero roller and a first roller of a DTY device, and passing modified polyester tows through the surface of the groove breaking roller to prepare the hollow diamond-shaped polyester low stretch yarns for the fabrics;
the preparation method of the modified polyester comprises the following steps: uniformly mixing terephthalic acid, ethylene glycol and dihydric alcohol with a silicon-containing main chain, and then sequentially carrying out esterification reaction and polycondensation reaction;
the dihydric alcohol with silicon-containing main chain is dimethyl silicon glycol, dimethyl diphenyl disiloxane glycol or tetramethyl disiloxane glycol;
the groove breaking roller is a roller with a plurality of annular grooves engraved on the peripheral surface, the annular grooves surround the central shaft of the roller and are distributed at equal intervals along the central shaft of the roller, and the variable-frequency filament transfer device is used for driving the polyester POY filaments to reciprocate along the central shaft of the roller on the peripheral surface of the groove breaking roller;
the diameter of the end face of the groove breaking roller is 80 mm; the distance between two adjacent grooves is 6mm, and the distance between the two grooves on the outermost side in the central axis direction of the roller and the end of the roller closest to the grooves is 3.25 mm; the depth of the grooves is 2.6mm, the width is 4mm, and the number of the grooves is 4; the moving period of the variable-frequency wire moving device is 50-99 reciprocating times/min;
the temperature of a second hot box of the DTY process is 150-170 ℃.
2. The method for preparing the polyester drawn textured yarn for the hollowed-out diamond fabric, according to claim 1, wherein the single filament fineness of the polyester drawn textured yarn for the hollowed-out diamond fabric is 0.7 to 1.5dtex, the crimp shrinkage is 10.0 +/-1.0%, the crimp stability is not less than 78%, the linear density deviation rate is not more than 1.2%, the breaking strength is 3.0 +/-0.35 cN/dtex, the CV value of the breaking strength is not more than 4.0%, the elongation at break is 35.0 +/-3.0%, the CV value of the elongation at break is not more than 8.0%, the CV value of the variation coefficient of the crimp shrinkage is not more than 9.0%, the shrinkage in boiling water is 2.0 +/-0.5%, and the oil content is 2 to 3 wt%.
3. The method for preparing the terylene low stretch yarn for the hollowed-out diamond-shaped fabric according to claim 1, wherein the terylene low stretch yarn for the hollowed-out diamond-shaped fabric is in a bamboo joint shape, and the length of the bamboo joint is 3.1-5.80 pieces/m.
4. The preparation method of the polyester low stretch yarn for the hollowed-out diamond-shaped fabric according to claim 1, wherein the dyeing rate of the polyester low stretch yarn for the hollowed-out diamond-shaped fabric at a temperature of 130 ℃ is 88.3-91.2%, the K/S value is 22.62-25.54, the soaping-resistant color fastness reaches 5 grade, the dry rubbing fastness reaches 5 grade, and the wet rubbing fastness is higher than 4 grade.
5. The preparation method of the polyester low stretch yarn for the hollowed-out diamond-shaped fabric according to claim 1, wherein the modified polyester is prepared by the following steps:
(1) performing esterification reaction;
preparing terephthalic acid, ethylene glycol and dihydric alcohol with a silicon-containing main chain into slurry, adding a catalyst, a delustering agent and a stabilizer, uniformly mixing, pressurizing in a nitrogen atmosphere to perform esterification reaction, wherein the pressurizing pressure is normal pressure to 0.3MPa, the esterification reaction temperature is 250-260 ℃, and the esterification reaction end point is determined when the distilled amount of water in the esterification reaction reaches more than 90% of a theoretical value;
(2) performing polycondensation reaction;
and after the esterification reaction is finished, starting the polycondensation reaction in the low vacuum stage under the negative pressure condition, stably pumping the pressure in the low vacuum stage from normal pressure to below 500Pa in 30-50 min at the reaction temperature of 250-260 ℃ for 30-50 min, then continuously pumping the vacuum to perform the polycondensation reaction in the high vacuum stage, so that the reaction pressure is further reduced to below 100Pa, the reaction temperature is 270-275 ℃, and the reaction time is 50-90 min.
6. The preparation method of the polyester low stretch yarn for the hollowed-out diamond-shaped fabric, according to claim 5, wherein the molar ratio of the terephthalic acid to the glycol with the silicon-containing main chain is 1: 1.2-2.0: 0.03-0.05, and the addition amounts of the catalyst, the delustering agent and the stabilizer are 0.03-0.05 wt%, 0.20-0.25 wt% and 0.01-0.05 wt% of the addition amount of the terephthalic acid, respectively.
7. The method for preparing the terylene low stretch yarn for the hollowed-out diamond-shaped fabric according to claim 6, wherein the catalyst is antimony trioxide, ethylene glycol antimony or antimony acetate, the flatting agent is titanium dioxide, and the stabilizer is triphenyl phosphate, trimethyl phosphate or trimethyl phosphite.
8. The preparation method of the polyester drawn textured diamond fabric as claimed in claim 7, wherein the modified polyester has a number average molecular weight of 25000-30000 and a molecular weight distribution index of 1.8-2.2.
9. The preparation method of the polyester drawn textured diamond yarn for the hollowed-out diamond-shaped fabric according to claim 1, wherein the POY process comprises the following steps: metering, spinneret plate extrusion, cooling, oiling and winding;
the parameters of the POY process are as follows: the spinning temperature is 280-285 ℃, the cooling temperature is 17-20 ℃, and the winding speed is 3200-3600 m/min.
10. The preparation method of the polyester low stretch yarn for the hollowed-out rhombic fabric, according to claim 1, is characterized in that the DTY process comprises the following steps: carrying out thread guiding, heating and stretching, false twisting, heat setting and winding;
the DTY process has the following parameters: spinning speed is 400-800 m/min, setting overfeed rate is 3.5-5.5%, winding overfeed rate is 3.0-5.5%, temperature of a first hot box is 180-200 ℃, and stretching ratio is 1.6-1.8.
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| CN102787411A (en) * | 2012-07-22 | 2012-11-21 | 东华大学 | Prepositive left and right deflection overfeeding composite spinning device and process |
| CN108071009A (en) * | 2017-12-14 | 2018-05-25 | 江苏恒力化纤股份有限公司 | A kind of method for reducing spun polyester thread filoplume |
| CN108130624A (en) * | 2017-12-14 | 2018-06-08 | 江苏恒力化纤股份有限公司 | A kind of polyester imitates linen look abnormal contraction composite filament and preparation method thereof |
| CN108385186A (en) * | 2017-12-14 | 2018-08-10 | 江苏恒力化纤股份有限公司 | A kind of polyester POY fibers and preparation method thereof |
| CN108385195A (en) * | 2017-12-14 | 2018-08-10 | 江苏恒力化纤股份有限公司 | A kind of polyester DTY fiber and preparation method thereof |
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| CN102787411A (en) * | 2012-07-22 | 2012-11-21 | 东华大学 | Prepositive left and right deflection overfeeding composite spinning device and process |
| CN108071009A (en) * | 2017-12-14 | 2018-05-25 | 江苏恒力化纤股份有限公司 | A kind of method for reducing spun polyester thread filoplume |
| CN108130624A (en) * | 2017-12-14 | 2018-06-08 | 江苏恒力化纤股份有限公司 | A kind of polyester imitates linen look abnormal contraction composite filament and preparation method thereof |
| CN108385186A (en) * | 2017-12-14 | 2018-08-10 | 江苏恒力化纤股份有限公司 | A kind of polyester POY fibers and preparation method thereof |
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