CN109735946B

CN109735946B - Colored polyester hoisting belt and preparation method thereof

Info

Publication number: CN109735946B
Application number: CN201811615793.2A
Authority: CN
Inventors: 尹立新; 邵义伟; 杨超明
Original assignee: Jiangsu Hengli Chemical Fiber Co Ltd
Current assignee: Jiangsu Hengli Chemical Fiber Co Ltd
Priority date: 2018-12-27
Filing date: 2018-12-27
Publication date: 2020-08-14
Anticipated expiration: 2038-12-27
Also published as: CN109735946A

Abstract

The invention relates to a colored polyester hoisting belt and a preparation method thereof, wherein the preparation method comprises the following steps: stranding, dyeing, antistatic finishing, ultraviolet-resistant finishing, weaving, core threading and sewing the modified polyester industrial yarns to obtain a colored polyester hoisting belt; the modified polyester industrial yarn is prepared by solid phase polycondensation tackifying, melting, metering, extruding, cooling, oiling, stretching, heat setting and winding of modified polyester melt; the preparation method of the modified polyester before solid phase polycondensation tackifying comprises the following steps: uniformly mixing terephthalic acid, ethylene glycol, dihydric alcohol with trimethylsilyl lateral group and hexanediol with tert-butyl lateral group, and then carrying out esterification reaction and polycondensation reaction in sequence. The dye uptake of the modified polyester industrial yarn at the temperature of 130 ℃ is 87.6-93.2%. The UV-A transmittance of the colored polyester hoisting belt is 1.7-3.0%. The preparation method of the invention has simple process and low cost; the prepared product has high dyeing property and good application prospect.

Description

Colored polyester hoisting belt and preparation method thereof

Technical Field

The invention belongs to the technical field of modified polyester fibers, and relates to a colored polyester hoisting belt and a preparation method thereof.

Background

The steel wire rope is a traditional hoisting tool, and is easy to damage and destroy articles to a certain extent, and the hoisting belt has been produced since the 50 th century, gradually replaces the steel wire rope, and is widely applied to the fields of ships, ports, metallurgy, steel, machinery, construction sites, mines, petroleum, chemical industry, hydropower stations, ports, wharfs, electric power, electronics, warehouses, transportation, military affairs and the like.

Because the hoisting belt needs to be capable of bearing larger pulling force and the operation environment is worse, certain requirements are provided for the material of the hoisting belt. The polyester industrial yarn has the advantages of high modulus, low elongation, good heat resistance, strong acid resistance, fatigue resistance and the like, and becomes a common material for hoisting belts. The hoisting belt made of the polyester industrial yarn has the following characteristics besides the advantages: 1) the texture is soft, so the use of the hoisting belt can reduce the damage to the surface which is easy to operate and particularly reduce the damage to the painted surface; 2) the weight of the hoisting belt is 25 percent of that of a metal hoisting rigging with the same tension, so that the hoisting belt is easy to carry, transport and store and is very easy to operate; 3) the safety and reliability are realized, the tensile property of the hoisting belt is close to that of a steel wire rope, and the safety coefficient is high. At present, the hoisting belt is generally colored internationally so as to conveniently distinguish the specification (bearing tonnage) of the hoisting belt, which greatly facilitates the identification of the hoisting belts with different specifications.

However, since terylene is a hydrophobic fiber, the molecule of terylene does not contain hydrophilic groups, and the molecular structure of terylene lacks active groups which can be combined with dyes, ultraviolet resistant agents, antistatic agents and the like, such as cellulose or protein fibers, so that the dyeing performance, ultraviolet resistant performance and antistatic performance of terylene fibers are poor. In addition, the finished product of the polyester fiber is a partially crystallized supermolecular structure, molecular chains of crystallized parts of the polyester fiber are mutually parallel and mostly in a trans-conformation, an amorphous area is mostly in a cis-conformation, and the molecular arrangement of the polyester fiber is quite compact, so that active groups in dye molecules, an anti-ultraviolet agent and an antistatic agent are difficult to permeate into the fiber, and the dyeing performance, the antistatic performance and the anti-ultraviolet performance of a hoisting belt are influenced to a great extent.

Therefore, the development of the colored terylene hoisting belt with excellent dyeing property and good antistatic and uvioresistant properties has practical significance.

Disclosure of Invention

The invention aims to overcome the defects of low dye-uptake, high requirement on equipment and high dyeing cost of a terylene lifting belt in the prior art, and provides a colored terylene lifting belt with excellent dyeing property and good antistatic and uvioresistant properties and a preparation method thereof.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

the preparation method of colored polyester hoisting belt, carry on the plying, dyeing, antistatic finish, uvioresistant finish, weave, wear the core and sew up modified polyester industrial yarn and make colored polyester hoisting belt, the hoisting belt is a flexible component used for connecting the lifting tool and goods while loading and unloading and lifting the goods, the preparation method of the hoisting belt of the invention is basically the same as prior art, the most important difference lies in the material, the material of the hoisting belt of the prior art is ordinary polyester generally, the material of the hoisting belt of the invention is modified polyester;

the modified polyester industrial yarn is prepared by performing solid phase polycondensation tackifying, melting, metering, extruding, cooling, oiling, stretching, heat setting and winding on a modified polyester melt;

the preparation method of the modified polyester before solid-phase polycondensation tackifying comprises the following steps: uniformly mixing terephthalic acid, ethylene glycol, dihydric alcohol with trimethylsilyl lateral group and hexanediol with tert-butyl lateral group, and then carrying out esterification reaction and polycondensation reaction in sequence;

the structural formula of the dihydric alcohol with the trimethylsilyl lateral group is as follows:

in the formula, R₁is-CH₂-、-CH(CH₃) -or-C ((CH)₃)₂)-；

The structural formula of hexanediol with tert-butyl side groups is as follows:

in the formula, R₂is-H,-CH₂CH₃or-C (CH)₃)₃。

The invention uses diol with trimethylsilyl lateral group (3-trimethylsilyl-1, 2-propylene glycol, 3-trimethylsilyl-3-methyl-1, 2-propylene glycol or 3-trimethylsilyl-3, 3-dimethyl-1, 2-propylene glycol) and hexanediol with tertiary butyl lateral group to modify polyester, the diol with trimethylsilyl lateral group and hexanediol with tertiary butyl lateral group can obviously increase the space free volume of modified polyester, in particular, the presence of trimethylsilyl groups in glycols with trimethylsilyl side groups and of t-butyl groups in hexanediol with t-butyl side groups causes changes in the mobility of the backbone, therefore, the interaction force among the chain units is changed, the distance among the chain units is correspondingly changed, and the free volume of the modified polyester cavity is increased. The increase of the free volume of the cavity can reduce the difficulty of dye molecules penetrating into the modified polyester, improve the dyeing performance of the modified polyester, reduce the dyeing temperature, shorten the dyeing time, reduce the energy consumption and improve the dye uptake of the modified polyester (namely a colored polyester hoisting belt); on the other hand, the active groups of the molecules in antistatic and UV-resistant finishes, such as-NH₂OH and COOH can be diffused into the fiber gaps in the heat treatment process, so that the antistatic and ultraviolet resistant performances of the colored polyester hoisting belt are improved.

As a preferred technical scheme:

according to the preparation method of the colored polyester hoisting belt, the synthesis steps of the dihydric alcohol with the trimethylsilyl lateral group are as follows:

(1) mixing raw materials of alkene, peracetic acid and dichloromethane according to a molar ratio of 1: 5-10: 10-15, reacting for 5-8 hours at the temperature of 35-40 ℃, stirring during the reaction, removing a solvent after the reaction is finished, and purifying and refining to obtain the trimethylsilyl propylene epoxide;

(2) mixing water, concentrated sulfuric acid and trimethylsilyl propylene epoxide, heating the mixture to 80-85 ℃ in a water bath under the stirring condition, carrying out heat preservation reaction for l 0-15 min, cooling the mixture to room temperature after the reaction is finished, and carrying out neutralization, distillation, separation and purification to obtain dihydric alcohol with a trimethylsilyl lateral group, wherein the concentrated sulfuric acid is sulfuric acid with the mass concentration of 70%, the molar ratio of the trimethylsilyl propylene epoxide to the water is 1: 20-40 at the beginning of the reaction, and the mass of the concentrated sulfuric acid accounts for 0.1-0.15% of the total mass of the mixture;

r in the structural formula of the dihydric alcohol with the trimethylsilyl lateral group₁is-CH (CH)₃) -and-C ((CH)₃)₂) -when said starting alkenes correspond to 3-trimethylsilyl-3-methylpropene and 3-trimethylsilyl-3, 3-dimethylpropene;

the synthesis method of the hexanediol with the tert-butyl side group comprises the following steps: firstly, mixing a raw material solution A with the concentration of 300-350 g/L and a dilute sulfuric acid solution with the concentration of 200-300 g/L according to the molar ratio of the raw material A to sulfuric acid of 1.5-2: 1, adding the mixture into a cathode electrolytic cell, then cooling the mixed solution to 10-15 ℃, carrying out electrolytic reduction until the concentration of the raw material A is lower than 10 wt%, and finally carrying out cooling crystallization, separation and purification;

r in the structural formula of the hexanediol with the tertiary butyl side group₂is-H, -CH₂CH₃and-C (CH)₃)₃In this case, the raw material A is 2, 2-methylpropionaldehyde, 2-dimethyl-3-pentanone, and 2,24, 4-tetramethyl-3-pentanone, respectively.

According to the preparation method of the colored polyester hoisting belt, the preparation steps of the modified polyester before solid-phase polycondensation and tackifying are as follows:

(1) performing esterification reaction;

preparing terephthalic acid, ethylene glycol, dihydric alcohol with trimethylsilyl lateral group and hexanediol with tert-butyl lateral group 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 water distillation amount in the esterification reaction reaches more than 90% of the theoretical value;

(2) performing 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 below 500Pa in 30-50 min, the reaction temperature is 250-260 ℃, the reaction time is 30-50 min, then continuously pumping vacuum to perform the polycondensation reaction in a high vacuum stage, so that the reaction pressure is further reduced to below 100Pa, the reaction temperature is 270-282 ℃, and the reaction time is 50-90 min.

According to the preparation method of the colored polyester hoisting belt, the molar ratio of the terephthalic acid to the ethylene glycol to the diol with the trimethylsilyl lateral group to the hexanediol with the tert-butyl lateral group is 1: 1.2-2.0: 0.01-0.02: 0.01-0.015, and the addition amounts of the catalyst, the delustering agent and the stabilizer are respectively 0.03-0.05 wt%, 0.20-0.25 wt% and 0.01-0.05 wt% of the addition amount of the terephthalic acid. The addition amounts of the diol with the trimethylsilyl group side group and the hexanediol with the tert-butyl group side group are not limited to the above, and the adjustment range is not suitable for being adjusted by a person skilled in the art, the excessive addition amount causes great damage to the regularity of the polyester macromolecular structure, influences on the crystallinity and the mechanical property of the fiber are great, the production and the application of the fiber are not facilitated, and the effect (the improvement effect on the dyeing property, the antistatic property and the ultraviolet resistance) is not obvious if the addition amount is too low.

According to the preparation method of the colored terylene hoisting belt, 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 colored polyester hoisting belt, the intrinsic viscosity of the modified polyester after solid-phase polycondensation and tackifying is 1.0-1.2 dL/g.

According to the preparation method of the colored polyester hoisting belt, the spinning process parameters of the modified polyester industrial yarn are as follows:

the technological parameters of stretching and heat setting are as follows:

the dyeing adopts a high-temperature high-pressure dyeing method, the dye solution is a disperse dye solution, the concentration of the dye solution is 2-4 wt%, the pH value is 4-5, the dyeing temperature is 130 ℃, the pressure is 0.28-0.31 MPa, and the time is 1-2 h; the antistatic finishing and the ultraviolet-resistant finishing adopt a one-dipping one-rolling process, the dipping temperature is 60-80 ℃, the time is 10-20 s, the temperature of a roller is 80-100 ℃, the pressure is 2.0-3.0 MPa, the drying temperature after the dipping is 80-100 ℃, the time is 3-5 min, and the baking temperature after the dipping is 130-170 ℃, and the time is 5-8 min; the antistatic finishing adopts SiO₂Polysorbate-80 finishing liquid, wherein the ultraviolet-resistant finishing agent SCJ-966 is adopted in the ultraviolet-resistant finishing.

The preparation process of the present invention is not limited thereto, and only one possible technical solution is illustrated here. The specific process parameters are not limited to the above and can be adjusted according to actual requirements.

The invention also provides the colored polyester hoisting belt prepared by the preparation method of the colored polyester hoisting belt, which mainly comprises modified polyester industrial yarns, wherein the molecular chain of the modified polyester comprises a terephthalic acid chain segment, an ethylene glycol chain segment, a dihydric alcohol chain segment with a trimethylsilyl lateral group and a hexanediol chain segment with a tert-butyl lateral group.

As a preferred technical scheme:

the colored polyester hoisting belt has the advantages that the filament number of the modified polyester industrial yarn is 3.0-6.0 dtex, the filament number of the modified polyester industrial yarn is 1100-1500 dtex, the breaking strength is more than or equal to 8.3cN/dtex, the linear density deviation rate is +/-1.5%, the breaking strength CV value is less than or equal to 3.0%, the elongation at break is 12.0-16.0%, the elongation at break CV value is less than or equal to 8.0%, the elongation at 4.0cN/dtex load is 5.5-7.0%, the dry heat shrinkage rate under the conditions of 177 ℃ multiplied by 10min multiplied by 0.05cN/dtex is 2.8-9.2%, the network degree is (5-8) +/-2/m, the oil content is 0.6 +/-0.2 wt%, the dye uptake under the temperature condition of 130 ℃ is 87.6-93.2%, the K/S value is 23.87-26.32, the color fastness is 4 grade, the common polyester industrial yarn (hexanediol without addition, the silicon-based side group of the tertiary butyl tape and the silicon-based side group of the silicone-based temperature of 130 ℃ is 20.85S) under the condition of the temperature of the silicone-based temperature of the polyester industrial yarn, the invention modifies polyester by introducing the dihydric alcohol with the trimethylsilyl lateral group and the hexanediol with the tert-butyl lateral group, greatly improves the dyeing property of the polyester industrial yarn, and simultaneously the mechanical property of the prepared polyester industrial yarn is not reduced and is equivalent to the prior art.

According to the colored polyester hoisting belt, the warp loop tissue density of the colored polyester hoisting belt is 160 +/-20 pieces/10 cm, the weft loop tissue density is 70 +/-10 pieces/10 cm, the breaking strength is more than or equal to 58800N, and the breaking elongation is higher than or equal to 58800N<20% tensile elastic recovery>80 percent, the safety coefficient is more than or equal to 8.0 (the safety coefficient standard of national hoisting slings is 6), the UV-A transmissivity is 1.7-3.0 percent, the antistatic and uvioresistant performance of the colored terylene hoisting belt is superior to the prior art, mainly because the colored terylene hoisting belt is improved in material, hexanediol chain segments with tertiary butyl side groups and diol chain segments with trimethylsilyl side groups are introduced into the molecular chain of the polyester, the tertiary butyl in the hexanediol with the tertiary butyl side groups and the trimethylsilyl in the diol with the trimethylsilyl side groups can cause the change of the activity of the main chain at a certain temperature, therefore, the interaction force among the chain units is changed, the distance among the chain units is correspondingly changed, and the free volume of the polymer cavity is increased, and the increase of the free volume of the cavity is beneficial to active groups such as-NH in the dye, the antistatic finishing agent and the ultraviolet-resistant finishing agent.₂OH, COOH and the like enter the fiber, so that the dyeing effect and the ultraviolet resistance efficiency of the colored terylene hoisting belt are improved.

The invention mechanism is as follows:

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.

For ethylene glycol dihydric alcohol straight chain molecule, the C atoms on the main chain are arranged in a zigzag arrangement from top to bottom, and when the H atom on a certain methylene on the main chain is replaced by a methyl (-CH)₃) When in substitution, the C atoms on the side groups and the main chain C atoms are not in the same plane, so that four sp3 hybridized orbitals on the center C are respectively overlapped with empty orbitals on the four surrounding C atoms to form four completely same sigma bonds which are arranged in a regular tetrahedron, the four carbon atoms are respectively positioned at four vertexes of the regular tetrahedron, when three hydrogen of a methyl group is further substituted by methyl (tertiary butyl) or trimethylsilyl, a larger tetrahedron structure can be formed, the molecular chain arranged in the regular tetrahedron is relatively zigzag, the free volume of the empty hole is obviously increased a lot, and the permeability and the diffusivity of small molecules can be obviously improved; when the H atom on a certain methylene on the main chain is replaced by 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 small rigidity, the molecular chains are easy to tangle, which is not beneficial to the situation that the long branched chain substituent is easy to entangleThe increase in free volume.

The invention obviously improves the dyeing property and the uvioresistant property of the colored terylene hoisting belt by introducing the hexanediol with the tertiary butyl side group and the dihydric alcohol with the trimethylsilyl side group into a polyester molecular chain, and the structural formula of the hexanediol with the tertiary butyl side group is as follows:

in the formula, R₂is-H (hexanediol with tert-butyl side group is 2,2,5, 5-tetramethyl-3, 4-hexanediol), -CH₂CH₃(hexanediol with pendant tert-butyl groups is 2,2,5, 5-tetramethyl-3, 4-diethyl-3, 4-hexanediol) or-C (CH)₃)₃(hexanediol with pendant tert-butyl groups is 2,2,4, 4-tetramethyl-3, 4-di-tert-butyl-3, 4-hexanediol);

in the formula, R₁is-CH₂- (diols with trimethylsilyl side group being 3-trimethylsilyl-1, 2-propanediol), -CH (CH)₃) - (diols with trimethylsilyl side groups being 3-trimethylsilyl-3-methyl-1, 2-propanediol) or-C ((CH)₃)₂) - (the diol having trimethylsilyl side groups is 3-trimethylsilyl-3, 3-dimethyl-1, 2-propanediol);

the existence of tertiary butyl in hexanediol with tertiary butyl side groups and trimethylsilyl in dihydric alcohol with trimethylsilyl side groups can cause the change of the activity of a main chain, thereby changing the interaction force among chain units, and correspondingly changing the distance among the molecular chain units, so that the free volume of the hollow cavity of the polyester is increased. Compared with short-chain substituent groups (such as methyl groups, ethyl groups and the like), the tertiary butyl group and the trimethylsilyl group occupy larger spatial positions, and larger free volume can be obtained in the molecular chain arrangement mode; on the one hand, the tertiary butyl and trimethylsilyl groups have an increased free volume of voids compared with the substituents of the long-chain branches, and the long-chain branches haveThe substituent increases the free volume of the slit, and on the other hand, the rigidity of the tertiary butyl group and the trimethylsilyl group is higher than that of the long-branched-chain substituent, so that the entanglement among molecular chains is reduced, and the tertiary butyl group and the trimethylsilyl group have more free volume than the long-branched-chain substituent in the arrangement mode of the molecular chains. The increase of the free volume of the cavity can reduce the difficulty of dye molecules penetrating into the modified polyester, improve the dyeing performance of the modified polyester, reduce the dyeing temperature, shorten the dyeing time, reduce the energy consumption and improve the dye uptake of the modified polyester (namely a colored polyester hoisting belt); on the other hand, the active groups of the molecules in antistatic and UV-resistant finishes, such as-NH₂OH and COOH can be diffused into the fiber gaps in the heat treatment process, so that the antistatic and ultraviolet resistant performances of the colored polyester hoisting belt are improved. The hexanediol with the tertiary butyl side group and the dihydric alcohol with the trimethylsilyl side group play a certain synergistic effect, and when the hexanediol with the tertiary butyl side group and the dihydric alcohol with the trimethylsilyl side group play a role, the dyeing performance and the ultraviolet resistance are improved more obviously.

Has the advantages that:

(1) the preparation method of the colored polyester hoisting belt has the advantages of simple process and low cost, and the hexanediol with the tertiary butyl side group and the dihydric alcohol with the trimethylsilyl side group are introduced into the polyester to modify the polyester, so that the cavity free volume of the polyester is increased, and the dyeing property and the uvioresistant property of the colored polyester hoisting belt are improved;

(2) the colored polyester hoisting belt has good dyeing property and ultraviolet resistance, good mechanical property and wide application prospect.

Drawings

FIG. 1 is a schematic diagram of a reaction apparatus for synthesizing hexanediol with a tertiary butyl side group according to the present invention.

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 colored polyester hoisting belt comprises the following steps:

(1) preparing modified polyester;

(1.1) synthesizing 2,2,5, 5-tetramethyl-3, 4-hexanediol by the following steps: firstly, mixing a 2, 2-methylpropionaldehyde solution with the concentration of 320g/L and a dilute sulfuric acid solution with the concentration of 200g/L according to the molar ratio of 2, 2-methylpropionaldehyde to sulfuric acid of 1.5:1, adding the mixture into a cathode electrolytic cell, then cooling the mixed solution to 12 ℃, then carrying out electrolytic reduction to the concentration of 2, 2-methylpropionaldehyde of 9.5 wt%, and finally carrying out cooling crystallization, separation and purification, wherein the schematic diagram of a reaction device adopted in the synthetic process is shown in figure 1, and the reaction chemical equation is as follows:

the structural formula of the prepared 2,2,5, 5-tetramethyl-3, 4-hexanediol is shown as a formula (I), wherein R is₂is-H;

(1.2) esterification reaction;

preparing terephthalic acid, ethylene glycol, 3-trimethylsilyl-1, 2-propanediol and 2,2,5, 5-tetramethyl-3, 4-hexanediol into slurry, adding antimony trioxide, titanium dioxide and triphenyl phosphate, uniformly mixing, pressurizing in nitrogen atmosphere to perform esterification reaction, wherein the pressurizing pressure is 0.1MPa, the temperature of the esterification reaction is 260 ℃, the end point of the esterification reaction is determined when the distilled amount of water in the esterification reaction reaches 90% of the theoretical value, wherein the molar ratio of terephthalic acid, ethylene glycol, 3-trimethylsilyl-1, 2-propanediol and 2,2,5, 5-tetramethyl-3, 4-hexanediol is 1:1.2:0.015:0.015, and the addition amounts of antimony trioxide, titanium dioxide and triphenyl phosphate are 0.03 wt%, 0.22 wt% and 0.01 wt% of the addition amount of terephthalic acid, respectively;

(1.3) a polycondensation reaction;

after the esterification reaction is finished, starting the polycondensation reaction in the low vacuum stage under the negative pressure condition, smoothly pumping the pressure in the stage from normal pressure to the absolute pressure of 500 within 30min, controlling the reaction temperature to be 260 ℃ and the reaction time to be 30min, then continuously pumping the vacuum to perform the polycondensation reaction in the high vacuum stage, further reducing the reaction pressure to the absolute pressure of 60Pa, controlling the reaction temperature to be 282 ℃ and controlling the reaction time to be 50 min;

(2) preparing modified polyester industrial yarn;

carrying out solid phase polycondensation tackifying, melting, metering, extruding, cooling, oiling, stretching, heat setting and winding on the modified polyester melt to obtain the modified polyester industrial yarn, wherein the intrinsic viscosity of the modified polyester after solid phase polycondensation tackifying is 1.0dL/g, and the spinning process parameters are as follows:

the technological parameters of stretching and heat setting are as follows:

the modified polyester industrial yarn has the filament number of 4.0dtex, the multifilament number of 1100dtex, the breaking strength of 8.5cN/dtex, the deviation rate of linear density of-1.5 percent, the CV value of the breaking strength of 2.8 percent, the elongation at break of 12.0 percent, the CV value of the elongation at break of 7.9 percent, the elongation at 4.0cN/dtex load of 5.5 percent, the dry heat shrinkage rate of 9.2 percent under the conditions of 177 ℃ multiplied by 10min multiplied by 0.05cN/dtex, the network degree of 7/m, the oil content of 0.6wt percent, the dye uptake of 90.26 percent under the temperature condition of 130 ℃, the K/S value of 23.87 and the color fastness of 4 grades;

(3) preparing a colored polyester hoisting belt;

the modified polyester industrial yarn is stranded, dyed, subjected to antistatic finishing, ultraviolet-resistant finishing, woven, core-penetrating and sewn to obtain the colored polyester hoisting belt, the number of stranded strands is 11, the dyeing adopts a high-temperature high-pressure dyeing method, the dye solution is a disperse dye solution, the concentration of the dye solution is 3 wt%, the pH value is 4, the dyeing temperature is 130 ℃, and the pressure is high0.28MPa for 1.3 h; adopting a one-dipping one-rolling process for antistatic finishing and ultraviolet-resistant finishing, wherein the dipping temperature is 80 ℃, the time is 15s, the temperature of a roller is 80 ℃, the pressure is 2.6MPa, the drying temperature after padding is 80 ℃, the time is 3min, the baking temperature after padding is 140 ℃, and the time is 8 min; the antistatic finishing adopts SiO₂The polysorbate-80 finishing liquid adopts an anti-ultraviolet finishing agent SCJ-966 for anti-ultraviolet finishing, the weft density of weaving is 1.2/10cm, and core threading and sewing are performed after a weaving belt obtained by weaving is threaded outside polyester yarn with the breaking strength of 47000N by a core threading machine.

The finally prepared colored polyester lifting belt mainly comprises modified polyester industrial yarns, the warp-wise loop tissue density of the colored polyester lifting belt is 150 pieces/10 cm, the weft-wise loop tissue density is 60 pieces/10 cm, the breaking strength is 58800N, the breaking elongation is 18%, the tensile elastic recovery rate is 83%, the safety coefficient is 8.2, and the UV-A transmittance is 2.0%.

Comparative example 1

A method for preparing colored polyester hoisting belt, the preparation steps are basically the same as example 1, except that 3-trimethylsilyl-1, 2-propanediol and 2,2,5, 5-tetramethyl-3, 4-hexanediol are not added, i.e. polyester is not modified, the obtained polyester industrial yarn has a single filament number of 4.0dtex, a multifilament number of 1100dtex, a breaking strength of 8.4cN/dtex, a linear density deviation of-1.5%, a breaking strength CV value of 2.8%, an elongation at break of 12.2%, an elongation at break CV value of 7.8%, an elongation at 4.0cN/dtex load of 5.5%, a dry heat shrinkage rate under 177 ℃ x 10min x 0.05cN/dtex condition of 9.3%, a network degree of 7/m, an oil content of 0.6 wt%, a dye uptake under 130 ℃ condition of 85.8%, and a K/S value of 20.43, the staining fastness is 4 grades; the finally prepared colored polyester hoisting belt has the warp loop tissue density of 150 pieces/10 cm, the weft loop tissue density of 60 pieces/10 cm, the breaking strength of 58300N, the breaking elongation of 17 percent, the tensile elastic recovery of 83 percent, the safety coefficient of 8.0 and the UV-A transmittance of 5.1 percent.

Comparing example 1 with comparative example 1, the present invention can be seen by adding 3-trimethylsilyl-1, 2-propanediol and 2,2,5, 5-tetramethylenediolThe radical-3, 4-hexanediol remarkably improves the dyeing property, the ultraviolet resistance and the antistatic property of the fiber, wherein 3-trimethylsilyl-1, 2-propanediol and 2,2,5, 5-tetramethyl-3, 4-hexanediol are mutually cooperated to improve the cavity free volume of the polyester, and dye molecules, ultraviolet resistance agents SCJ-966 and SiO₂The difficulty of entering the inside of the fiber by the molecules of the polysorbate-80 finishing liquid improves the dyeing performance, the ultraviolet resistance and the antistatic performance. In addition, the addition of 3-trimethylsilyl-1, 2-propanediol and 2,2,5, 5-tetramethyl-3, 4-hexanediol has little influence on other properties of the fiber, and does not influence the processability and mechanical properties of the fiber.

Comparative example 2

A method for preparing colored polyester hoisting belt, the preparation steps are basically the same as example 1, except that 1, 2-dodecyl glycol is used to replace 3-trimethylsilyl-1, 2-propanediol and 2,2,5, 5-tetramethyl-3, 4-hexanediol in step (1), the prepared polyester industrial yarn has a single filament fineness of 4.0dtex, a multifilament fineness of 1100dtex, a breaking strength of 8.2cN/dtex, a linear density deviation of-1.5%, a breaking strength CV value of 2.8%, an elongation at break of 12.2%, an elongation at break CV value of 7.8%, an elongation at 4.0cN/dtex load of 5.5%, a dry heat shrinkage rate of 9.6% under 177 ℃ x 10min x 0.05cN/dtex conditions, a network degree of 7/m, an oil content of 0.6 wt%, and a dye uptake at 130 ℃ of 86.35%, the K/S value is 21.17, and the staining fastness is 4 grade; the finally prepared colored polyester hoisting belt has the warp-wise loop tissue density of 150 pieces/10 cm, the weft-wise loop tissue density of 60 pieces/10 cm, the breaking strength of 58000N, the breaking elongation of 17 percent, the tensile elastic recovery of 83 percent, the safety coefficient of 8.0 and the UV-A transmittance of 6.8 percent.

As compared with example 1, it can be found that 3-trimethylsilyl-1, 2-propanediol and 2,2,5, 5-tetramethyl-3, 4-hexanediol are more favorable for improving the dyeing property, the ultraviolet resistance and the breaking strength of the colored terylene hoisting belt compared with 1, 2-dodecyl glycol containing long-chain branched substituents, mainly because the increased free volume of the trimethylsilyl group in the 3-trimethylsilyl-1, 2-propanediol and the tert-butyl group in the 2,2,5, 5-tetramethyl-3, 4-hexanediol is more hollow free volume on one hand, and the 1, 2-dodecyl glycol is more hollow free volumeThe increased free volume of the long-branched-chain substituent in the modified polyester is more slit free volume, and on the other hand, the rigidity of the trimethylsilyl group in 3-trimethylsilyl-1, 2-propanediol and the rigidity of the tert-butyl group in 2,2,5, 5-tetramethyl-3, 4-hexanediol are both greater than that of the long-branched-chain substituent in 1, 2-dodecyl glycol, so that entanglement among molecular chains is reduced, therefore, the trimethylsilyl group in the modified polyester has more free volume than that of the 1, 2-dodecyl glycol in the arrangement mode of the polyester molecular chain, the free volume of the cavity is increased, for the dyeing performance, the difficulty of dye molecules penetrating into the modified polyester is reduced, the dyeing performance of the modified polyester is improved, the dyeing temperature is reduced, the dyeing time is shortened, the energy consumption is reduced, and the dyeing rate of the modified polyester (namely, a colored polyester hoisting belt) is improved; for the ultraviolet resistance and the antistatic property, SiO is enabled₂Molecular active group such as-NH in polysorbate-80 finishing liquid and ultraviolet resistant finishing agent SCJ-966₂OH and COOH can be diffused into the fiber gaps in the heat treatment process, so that the antistatic and ultraviolet resistant performances of the colored polyester hoisting belt are improved.

Example 2

(1) preparing modified polyester;

(1.1) synthesizing 2,2,5, 5-tetramethyl-3, 4-diethyl-3, 4-hexanediol by the following steps: firstly, mixing a 2, 2-dimethyl 3-pentanone solution with the concentration of 350g/L and a dilute sulfuric acid solution with the concentration of 210g/L according to the molar ratio of 2, 2-dimethyl 3-pentanone to sulfuric acid of 1.6:1, adding the mixture into a cathode electrolytic cell, then cooling the mixed solution to 11 ℃, carrying out electrolytic reduction to the concentration of 9.0 wt% of 2, 2-dimethyl 3-pentanone, and finally carrying out cooling crystallization, separation and purification, wherein a reaction device and a reaction chemical equation adopted in the synthetic process are consistent with those of example 1, and the structural formula of the prepared 2,2,5, 5-tetramethyl-3, 4-diethyl-3, 4-hexanediol is shown as a formula (I), wherein R is₂is-CH₂CH₃；

(1.2) preparing 3-trimethylsilyl-3-methyl-1, 2-propanediol;

(a) mixing 3-trimethylsilyl-3-methylpropene, peracetic acid and dichloromethane according to a molar ratio of 1:5:10, reacting for 5 hours at the temperature of 35 ℃, stirring during the reaction, removing a solvent after the reaction is finished, and purifying and refining to obtain trimethylsilyl propylene epoxide;

(b) mixing water, concentrated sulfuric acid and trimethylsilyl propylene epoxide, heating to 80 ℃ in water bath under stirring, carrying out heat preservation reaction for 10min, cooling to room temperature after the reaction is finished, and carrying out neutralization, distillation, separation and purification to obtain 3-trimethylsilyl-3-methyl-1, 2-propylene glycol shown as a formula (II) R in the formula (II)₁is-CH (CH)₃) The concentrated sulfuric acid is sulfuric acid with the mass concentration of 70%, the molar ratio of the trimethylsilyl propylene epoxide to water is 1:20 when the reaction starts, and the mass of the concentrated sulfuric acid accounts for 0.1% of the mass sum of the mixture;

(1.3) esterification reaction;

preparing terephthalic acid, ethylene glycol, 3-trimethylsilyl-3-methyl-1, 2-propanediol and 2,2,5, 5-tetramethyl-3, 4-diethyl-3, 4-hexanediol 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 normal pressure, the esterification reaction temperature is 250 ℃, the esterification reaction endpoint is determined when the distilled amount of water in the esterification reaction reaches 96% of a theoretical value, the molar ratio of the terephthalic acid, the ethylene glycol, the 3-trimethylsilyl-3-methyl-1, 2-propanediol and the 2,2,5, 5-tetramethyl-3, 4-diethyl-3, 4-hexanediol is 1:2.0:0.01:0.013, the addition amounts of antimony trioxide, titanium dioxide and trimethyl phosphate are 0.04 wt%, 0.20 wt% and 0.04 wt% of the addition amount of terephthalic acid, respectively;

(1.4) a polycondensation reaction;

after the esterification reaction is finished, starting the polycondensation reaction in the low vacuum stage under the negative pressure condition, wherein the pressure in the stage is stably pumped from normal pressure to the absolute pressure of 450Pa within 35min, the reaction temperature is 255 ℃, the reaction time is 40min, then continuously pumping vacuum, and carrying out the polycondensation reaction in the high vacuum stage, so that the reaction pressure is further reduced to the absolute pressure of 100Pa, the reaction temperature is 270 ℃, and the reaction time is 60 min;

(2) preparing modified polyester industrial yarn;

the technological parameters of stretching and heat setting are as follows:

the modified polyester industrial yarn has the filament number of 6.0dtex, the multifilament number of 1100dtex, the breaking strength of 8.3cN/dtex, the linear density deviation rate of 0%, the breaking strength CV value of 2.7%, the elongation at break of 16.0%, the elongation at break CV value of 8.0%, the elongation at 4.0cN/dtex load of 5.5%, the dry heat shrinkage rate under the conditions of 177 ℃ multiplied by 10min multiplied by 0.05cN/dtex of 5.2%, the network degree of 3/m, the oil content of 0.4 wt%, the dye uptake under the temperature condition of 130 ℃ of 89.2%, the K/S value of 26.32 and the color fastness of 4 grades;

(3) preparing a colored polyester hoisting belt;

the method comprises the following steps of (1) stranding, dyeing, antistatic finishing, ultraviolet-resistant finishing, weaving, core threading and sewing modified polyester industrial yarns to obtain a colored polyester hoisting belt, wherein the number of stranded strands is 22, the dyeing adopts a high-temperature high-pressure dyeing method, a dye solution is a disperse dye solution, the concentration of the dye solution is 4 wt%, the pH value is 4, the dyeing temperature is 130 ℃, the pressure is 0.31MPa, and the time is 1 h; adopting a one-dipping one-rolling process for antistatic finishing and ultraviolet-resistant finishing, wherein the dipping temperature is 65 ℃, the time is 14s, the temperature of a roller is 100 ℃, the pressure is 3.0MPa, the drying temperature after padding is 80 ℃, the time is 5min, the baking temperature after padding is 130 ℃, and the time is 7 min; the antistatic finishing adopts SiO₂The polysorbate-80 finishing liquid adopts an anti-ultraviolet finishing agent SCJ-966 for anti-ultraviolet finishing, the weft density of weaving is 1.0/10cm, and core threading and sewing refer to that a core threading machine is adopted to thread a weaving belt obtained by weaving on polyester with the breaking strength of 43000NAnd sewing after the yarns are out.

The finally prepared colored polyester hoisting belt mainly comprises modified polyester industrial yarns, the warp-wise loop tissue density of the colored polyester hoisting belt is 140 pieces/10 cm, the weft-wise loop tissue density is 70 pieces/10 cm, the breaking strength is 61000N, the elongation at break is 17%, the elastic recovery rate of stretching is 81%, the safety coefficient is 8.0, and the UV-A transmittance is 1.7%.

Example 3

(1) preparing modified polyester;

(1.1) synthesizing 2,2,4, 4-tetramethyl-3, 4-di-tert-butyl-3, 4-hexanediol by the following steps: firstly, mixing a 2,24, 4-tetramethyl-3-pentanone solution with the concentration of 340g/L and a dilute sulfuric acid solution with the concentration of 230g/L according to the molar ratio of the 2,24, 4-tetramethyl-3-pentanone to the sulfuric acid of 1.7:1, adding the mixture into a cathode electrolytic cell, then cooling the mixed solution to 10 ℃, carrying out electrolytic reduction until the concentration of the 2,24, 4-tetramethyl-3-pentanone is 9.6 wt%, and finally carrying out cooling crystallization, separation and purification, wherein a reaction device and a reaction chemical equation adopted in the synthetic process are consistent with those of example 1, and the structural formula of the prepared 2,2,4, 4-tetramethyl-3, 4-di-tert-butyl-3, 4-hexanediol is shown as a formula (I), wherein R is R₂is-C (CH)₃)₃；

(1.2) preparing 3-trimethylsilyl-3-methyl-1, 2-propanediol;

(a) mixing 3-trimethylsilyl-3-methylpropene, peracetic acid and dichloromethane according to the molar ratio of 1:10:15, reacting for 8 hours at the temperature of 40 ℃, stirring during the reaction, removing the solvent after the reaction is finished, and purifying and refining to obtain trimethylsilyl propylene epoxide;

(b) mixing water, concentrated sulfuric acid and trimethylsilyl propylene epoxide, heating to 85 ℃ in water bath under stirring, carrying out heat preservation reaction for 15min, cooling to room temperature after the reaction is finished, and carrying out neutralization, distillation, separation and purification to obtain dihydric alcohol with trimethylsilyl lateral group shown in formula (II), wherein R in formula (II)₁is-CH (CH)₃) -, concentrated sulfuric acid is 70% sulfuric acid by mass, trimethylsilyl propylene at the beginning of the reactionThe molar ratio of the epoxide to the water is 1:40, and the mass of the concentrated sulfuric acid accounts for 0.15 percent of the total mass of the mixture;

(1.3) esterification reaction;

preparing terephthalic acid, ethylene glycol, 3-trimethylsilyl-3-methyl-1, 2-propanediol and 2,2,4, 4-tetramethyl-3, 4-di-tert-butyl-3, 4-hexanediol 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 0.3MPa, the esterification reaction temperature is 255 ℃, the esterification reaction end point is the end point when the distilled amount of water in the esterification reaction reaches 93 percent of the theoretical value, the molar ratio of the terephthalic acid, the ethylene glycol, the 3-trimethylsilyl-3-methyl-1, 2-propanediol and the 2,2,4, 4-tetramethyl-3, 4-di-tert-butyl-3, 4-hexanediol is 1:1.2:0.01:0.01, the addition amounts of ethylene glycol antimony, titanium dioxide and trimethyl phosphite are 0.05 wt%, 0.24 wt% and 0.03 wt% of the addition amount of terephthalic acid, respectively;

(1.4) a polycondensation reaction;

after the esterification reaction is finished, starting the polycondensation reaction in the low vacuum stage under the negative pressure condition, wherein the pressure in the stage is stably pumped from normal pressure to the absolute pressure of 460Pa within 40min, the reaction temperature is 256 ℃, the reaction time is 50min, then continuing to pump vacuum, and carrying out the polycondensation reaction in the high vacuum stage, so that the reaction pressure is further reduced to the absolute pressure of 90Pa, the reaction temperature is 281 ℃, and the reaction time is 70 min;

(2) preparing modified polyester industrial yarn;

the modified polyester industrial yarn is prepared by solid-phase polycondensation tackifying, melting, metering, extruding, cooling, oiling, stretching, heat setting and winding the modified polyester melt, the intrinsic viscosity of the modified polyester after solid-phase polycondensation tackifying is 1.1dL/g, and the spinning process parameters are as follows:

the technological parameters of stretching and heat setting are as follows:

the modified polyester industrial yarn has the filament number of 6.0dtex, the multifilament number of 1300dtex, the breaking strength of 8.6cN/dtex, the linear density deviation rate of 1.0 percent, the breaking strength CV value of 3.0 percent, the elongation at break of 12.0 percent, the elongation at break CV value of 7.6 percent, the elongation at 4.0cN/dtex load of 5.5 percent, the dry heat shrinkage rate of 2.8 percent under the conditions of 177 ℃ multiplied by 10min multiplied by 0.05cN/dtex, the network degree of 5/m, the oil content of 0.5wt percent, the dye uptake of 93.2 percent under the temperature condition of 130 ℃, the K/S value of 24.69 and the color fastness of 4 grades;

(3) preparing a colored polyester hoisting belt;

the method comprises the following steps of (1) stranding, dyeing, antistatic finishing, ultraviolet-resistant finishing, weaving, core threading and sewing modified polyester industrial yarns to obtain a colored polyester lifting belt, wherein the stranded number of strands is 17, the dyeing adopts a high-temperature high-pressure dyeing method, a dye solution is a disperse dye solution, the concentration of the dye solution is 4 wt%, the pH value is 4.2, the dyeing temperature is 130 ℃, the pressure is 0.28MPa, and the time is 1 h; adopting a one-dipping one-rolling process for antistatic finishing and ultraviolet-resistant finishing, wherein the dipping temperature is 60 ℃, the time is 20s, the temperature of a roller is 95 ℃, the pressure is 3.0MPa, the drying temperature after padding is 90 ℃, the time is 3min, the baking temperature after padding is 130 ℃, and the time is 5 min; the antistatic finishing adopts SiO₂The polysorbate-80 finishing liquid adopts an anti-ultraviolet finishing agent SCJ-966 for anti-ultraviolet finishing, the weft density of weaving is 1.1/10cm, and core threading and sewing refer to that a core threading machine is adopted to thread a weaving belt obtained by weaving outside polyester yarn with the breaking strength of 45000N and then sew.

The finally prepared colored polyester lifting belt mainly comprises modified polyester industrial yarns, the warp-wise loop tissue density of the colored polyester lifting belt is 160/10 cm, the weft-wise loop tissue density is 70/10 cm, the breaking strength is 60200N, the breaking elongation is 19%, the tensile elastic recovery rate is 85%, the safety coefficient is 8.3, and the UV-A transmittance is 2.2%.

Example 4

(1) preparing modified polyester;

(1.1) synthesizing 2,2,5, 5-tetramethyl-3, 4-hexanediol by the following steps: firstly, mixing a 2, 2-methylpropionaldehyde solution with the concentration of 300g/L and a dilute sulfuric acid solution with the concentration of 250g/L according to the molar ratio of the 2, 2-methylpropionaldehyde to sulfuric acid of 1.8:1, adding the mixture into a cathode electrolytic cell, then cooling the mixed solution to 15 ℃, carrying out electrolytic reduction to the concentration of the 2, 2-methylpropionaldehyde of 9.3 wt%, and finally carrying out cooling crystallization, separation and purification, wherein a reaction device and a reaction chemical equation adopted in the synthesis process are consistent with those of example 1, and the structural formula of the prepared 2,2,5, 5-tetramethyl-3, 4-hexanediol is shown as a formula (I), wherein R in the formula₂is-H;

(1.2) preparing 3-trimethylsilyl-3-methyl-1, 2-propanediol;

(a) mixing 3-trimethylsilyl-3-methylpropene, peracetic acid and dichloromethane according to a molar ratio of 1:10:10, reacting for 6 hours at the temperature of 36 ℃, stirring during the reaction, removing a solvent after the reaction is finished, and purifying and refining to obtain trimethylsilyl propylene epoxide;

(b) mixing water, concentrated sulfuric acid and trimethylsilyl propylene epoxide, heating in water bath to 84 ℃ under stirring, keeping the temperature for reaction for 12min, cooling to room temperature after the reaction is finished, and neutralizing, distilling, separating and purifying to obtain dihydric alcohol with trimethylsilyl lateral group shown in formula (II), wherein R in formula (II)₁is-CH (CH)₃) The concentrated sulfuric acid is sulfuric acid with the mass concentration of 70%, the molar ratio of the trimethylsilyl propylene epoxide to water is 1:30 when the reaction starts, and the mass of the concentrated sulfuric acid accounts for 0.14% of the mass sum of the mixture;

(1.3) esterification reaction;

preparing terephthalic acid, ethylene glycol, 3-trimethylsilyl-3-methyl-1, 2-propanediol and 2,2,5, 5-tetramethyl-3, 4-hexanediol 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 0.2MPa, the esterification reaction temperature is 250 ℃, the esterification reaction end point is determined when the distilled water amount in the esterification reaction reaches 91% of a theoretical value, the molar ratio of the terephthalic acid to the ethylene glycol to the 3-trimethylsilyl-3-methyl-1, 2-propanediol to the 2,2,5, 5-tetramethyl-3, 4-hexanediol is 1:1.8:0.02:0.01, and the adding amounts of the ethylene glycol antimony to the titanium dioxide to the triphenyl phosphate are respectively 0.05 wt% of the adding amount of the terephthalic acid, 0.25 wt% and 0.05 wt%;

(1.4) a polycondensation reaction;

after the esterification reaction is finished, starting the polycondensation reaction in the low vacuum stage under the negative pressure condition, wherein the pressure in the stage is stably pumped from normal pressure to the absolute pressure of 470Pa within 45min, the reaction temperature is 250 ℃, the reaction time is 50min, then continuing to pump vacuum, and carrying out the polycondensation reaction in the high vacuum stage, so that the reaction pressure is further reduced to the absolute pressure of 80Pa, the reaction temperature is 275 ℃, and the reaction time is 80 min;

(2) preparing modified polyester industrial yarn;

carrying out solid phase polycondensation tackifying, melting, metering, extruding, cooling, oiling, stretching, heat setting and winding on the modified polyester melt to obtain the modified polyester industrial yarn, wherein the intrinsic viscosity of the modified polyester after solid phase polycondensation tackifying is 1.2dL/g, and the spinning process parameters are as follows:

the technological parameters of stretching and heat setting are as follows:

the modified polyester industrial yarn has the filament number of 3.0dtex, the multifilament number of 1400dtex, the breaking strength of 8.4cN/dtex, the deviation rate of linear density of-1.0 percent, the CV value of the breaking strength of 3.0 percent, the elongation at break of 15.0 percent, the CV value of the elongation at break of 8.0 percent, the elongation at 4.0cN/dtex load of 7.0 percent, the dry heat shrinkage rate of 2.8 percent under the conditions of 177 ℃ multiplied by 10min multiplied by 0.05cN/dtex, the network degree of 6/m, the oil content of 0.8wt percent, the dyeing rate of 93.2 percent under the temperature condition of 130 ℃, the K/S value of 24.37 and the color fastness of 4 grades;

(3) preparing a colored polyester hoisting belt;

the colored polyester hoisting belt is prepared by stranding, dyeing, antistatic finishing, ultraviolet-resistant finishing, weaving, core threading and sewing the modified polyester industrial yarn, the stranding process parameters are the same as those of the embodiment 1, the dyeing adopts a high-temperature high-pressure dyeing method, the dye solution is a disperse dye solution, the concentration of the dye solution is 2 wt%, the pH value is 4.5, the dyeing temperature is 130 ℃, the pressure is 0.29MPa, and the time is 2 hours; adopting a one-dipping one-rolling process for antistatic finishing and ultraviolet-resistant finishing, wherein the dipping temperature is 600 ℃, the time is 20s, the temperature of a roller is 90 ℃, the pressure is 2.0MPa, the drying temperature after padding is 90 ℃, the time is 4min, the baking temperature after padding is 170 ℃, and the time is 5 min; the antistatic finishing adopts SiO₂The polysorbate-80 finishing liquid adopts an anti-ultraviolet finishing agent SCJ-966 for anti-ultraviolet finishing, and the process parameters of weaving, core threading and sewing are the same as those of example 1.

The finally prepared colored polyester hoisting belt mainly comprises modified polyester industrial yarns, the warp-wise loop tissue density of the colored polyester hoisting belt is 180 pieces/10 cm, the weft-wise loop tissue density is 60 pieces/10 cm, the breaking strength is 59600N, the elongation at break is 17%, the elastic recovery rate of stretching is 88%, the safety coefficient is 8.2, and the UV-A transmittance is 2.5%.

Example 5

(1) preparing modified polyester;

(1.1) synthesizing 2,2,5, 5-tetramethyl-3, 4-diethyl-3, 4-hexanediol by the following steps: firstly, mixing a 2, 2-dimethyl 3-pentanone solution with the concentration of 310g/L and a dilute sulfuric acid solution with the concentration of 300g/L according to the molar ratio of the 2, 2-dimethyl 3-pentanone to the sulfuric acid of 1.9:1, adding the mixture into a cathode electrolytic cell, then cooling the mixed solution to 15 ℃, then carrying out electrolytic reduction to the concentration of the 2, 2-dimethyl 3-pentanone of 8.8 wt%, finally carrying out cooling crystallization, separation and purification, wherein the solution is collected in the synthesis processThe reaction apparatus and the reaction chemical equation used were the same as in example 1, and the structural formula of the obtained 2,2,5, 5-tetramethyl-3, 4-diethyl-3, 4-hexanediol is shown in the formula (I), wherein R is₂is-CH₂CH₃；

(1.2) preparing 3-trimethylsilyl-3, 3-dimethyl-1, 2-propanediol;

(a) mixing 3-trimethylsilyl-3, 3-dimethylpropene, peracetic acid and dichloromethane according to the molar ratio of 1:8:12, reacting for 5 hours at the temperature of 40 ℃, stirring during the reaction, removing the solvent after the reaction is finished, and purifying and refining to obtain trimethylsilyl propylene epoxide;

(b) mixing water, concentrated sulfuric acid and trimethylsilyl propylene epoxide, heating to 85 ℃ in water bath under stirring, carrying out heat preservation reaction for 10min, cooling to room temperature after the reaction is finished, and carrying out neutralization, distillation, separation and purification to obtain dihydric alcohol with trimethylsilyl lateral group shown in formula (II), wherein R in formula (II)₁is-C ((CH)₃)₂) The concentrated sulfuric acid is sulfuric acid with the mass concentration of 70%, the molar ratio of the trimethylsilyl propylene epoxide to water is 1:25 when the reaction starts, and the mass of the concentrated sulfuric acid accounts for 0.12% of the mass sum of the mixture;

(1.3) esterification reaction;

preparing terephthalic acid, ethylene glycol, 3-trimethylsilyl-3, 3-dimethyl-1, 2-propanediol and 2,2,5, 5-tetramethyl-3, 4-diethyl-3, 4-hexanediol 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 258 ℃, the esterification reaction end point is determined when the distillation amount of water in the esterification reaction reaches 95% of a theoretical value, the molar ratio of the terephthalic acid, the ethylene glycol, the 3-trimethylsilyl-3, 3-dimethyl-1, 2-propanediol and the 2,2,5, 5-tetramethyl-3, 4-diethyl-3, 4-hexanediol is 1:1.5:0.016:0.015, the adding amount of the antimony acetate, the titanium dioxide and the trimethyl phosphate is respectively 0.04 wt%, 0.23 wt% and 0.04 wt% of the adding amount of the terephthalic acid;

(1.4) a polycondensation reaction;

after the esterification reaction is finished, starting the polycondensation reaction in the low vacuum stage under the negative pressure condition, wherein the pressure in the stage is stably pumped from normal pressure to the absolute pressure of 410Pa within 50min, the reaction temperature is 257 ℃, the reaction time is 38min, then continuing to pump vacuum, and carrying out the polycondensation reaction in the high vacuum stage, so that the reaction pressure is further reduced to the absolute pressure of 85Pa, the reaction temperature is 277 ℃, and the reaction time is 90 min;

(2) preparing modified polyester industrial yarn;

the technological parameters of stretching and heat setting are as follows:

the modified polyester industrial yarn has the filament number of 3.0dtex, the multifilament number of 1500dtex, the breaking strength of 8.5cN/dtex, the linear density deviation rate of 0.5%, the breaking strength CV value of 2.8%, the elongation at break of 13.0%, the elongation at break CV value of 7.7%, the elongation at 4.0cN/dtex load of 7.0%, the dry heat shrinkage rate under the conditions of 177 ℃ multiplied by 10min multiplied by 0.05cN/dtex of 2.8%, the network degree of 10/m, the oil content of 0.4 wt%, the dyeing rate under the temperature condition of 130 ℃ of 93.2%, the K/S value of 25.67 and the color fastness of 4 grades;

(3) preparing a colored polyester hoisting belt;

the colored polyester hoisting belt is prepared by stranding, dyeing, antistatic finishing, ultraviolet-resistant finishing, weaving, core threading and sewing the modified polyester industrial yarn, the stranding process parameters are the same as those of the embodiment 2, the dyeing adopts a high-temperature high-pressure dyeing method, the dye solution is a disperse dye solution, the concentration of the dye solution is 2 wt%, the pH value is 5, the dyeing temperature is 130 ℃, the pressure is 0.30MPa, and the time is 1.5 h; the antistatic finishing and the ultraviolet-resistant finishing adopt a one-dipping one-rolling process and dippingThe soaking temperature is 80 ℃, the soaking time is 10s, the roller temperature is 80 ℃, the pressure is 2.0MPa, the drying temperature after padding is 100 ℃, the drying time is 4min, the drying temperature after padding is 150 ℃, and the drying time is 8 min; the antistatic finishing adopts SiO₂The polysorbate-80 finishing liquid adopts an anti-ultraviolet finishing agent SCJ-966 for anti-ultraviolet finishing, and the process parameters of weaving, core threading and sewing are the same as those of example 2.

The finally prepared colored polyester hoisting belt mainly comprises modified polyester industrial yarns, the warp-wise loop tissue density of the colored polyester hoisting belt is 170 pieces/10 cm, the weft-wise loop tissue density is 80 pieces/10 cm, the breaking strength is 62500N, the breaking elongation is 18%, the tensile elastic recovery rate is 85%, the safety coefficient is 8.2, and the UV-A transmittance is 3.0%.

Example 6

(1) preparing modified polyester;

(1.1) synthesizing 2,2,4, 4-tetramethyl-3, 4-di-tert-butyl-3, 4-hexanediol by the following steps: firstly, mixing a 2,24, 4-tetramethyl-3-pentanone solution with the concentration of 350g/L and a dilute sulfuric acid solution with the concentration of 220g/L according to the molar ratio of 2,24, 4-tetramethyl-3-pentanone to sulfuric acid of 2:1, adding the mixture into a cathode electrolytic cell, then cooling the mixed solution to 13 ℃, carrying out electrolytic reduction until the concentration of the 2,24, 4-tetramethyl-3-pentanone is 9.6 wt%, and finally carrying out cooling crystallization, separation and purification, wherein a reaction device and a reaction chemical equation adopted in the synthetic process are consistent with those of example 1, and the structural formula of the prepared 2,2,4, 4-tetramethyl-3, 4-di-tert-butyl-3, 4-hexanediol is shown as a formula (I), wherein R is R₂is-C (CH)₃)₃；

(1.2) preparing 3-trimethylsilyl-3, 3-dimethyl-1, 2-propanediol;

(a) mixing 3-trimethylsilyl-3, 3-dimethylpropene, peracetic acid and dichloromethane according to the molar ratio of 1:10:10, reacting for 6 hours at the temperature of 35 ℃, stirring during the reaction, removing the solvent after the reaction is finished, and purifying and refining to obtain trimethylsilyl propylene epoxide;

(b) mixing water, concentrated sulfuric acid and trimethylsilyl acrylateMixing alkylene epoxide, heating to 80 ℃ in water bath under stirring, keeping the temperature for reaction for 15min, cooling to room temperature after the reaction is finished, and obtaining the dihydric alcohol with the trimethylsilyl lateral group shown in the formula (II) through neutralization, distillation, separation and purification, wherein R in the formula (II)₁is-C ((CH)₃)₂) The concentrated sulfuric acid is sulfuric acid with the mass concentration of 70%, the molar ratio of the trimethylsilyl propylene epoxide to water is 1:35 when the reaction starts, and the mass of the concentrated sulfuric acid accounts for 0.14% of the mass sum of the mixture;

(1.3) esterification reaction;

preparing terephthalic acid, ethylene glycol, 3-trimethylsilyl-3, 3-dimethyl-1, 2-propanediol and 2,2,4, 4-tetramethyl-3, 4-di-tert-butyl-3, 4-hexanediol 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 0.3MPa, the esterification reaction temperature is 260 ℃, the esterification reaction end point is the end point when the distilled amount of water in the esterification reaction reaches 90% of a theoretical value, the molar ratio of the terephthalic acid, the ethylene glycol, the 3-trimethylsilyl-3, 3-dimethyl-1, 2-propanediol and the 2,2,4, 4-tetramethyl-3, 4-di-tert-butyl-3, 4-hexanediol is 1:2.0:0.02:0.012, the adding amount of the antimony acetate, the titanium dioxide and the trimethyl phosphite is 0.03 wt%, 0.25 wt% and 0.01 wt% of the adding amount of the terephthalic acid respectively;

(1.4) a polycondensation reaction;

after the esterification reaction is finished, starting the polycondensation reaction in the low vacuum stage under the negative pressure condition, wherein the pressure in the stage is stably pumped from normal pressure to the absolute pressure of 400Pa within 35min, the reaction temperature is 253 ℃, the reaction time is 30min, then continuing to pump vacuum, and carrying out the polycondensation reaction in the high vacuum stage, so that the reaction pressure is further reduced to the absolute pressure of 100Pa, the reaction temperature is 270 ℃, and the reaction time is 65 min;

(2) preparing modified polyester industrial yarn;

the technological parameters of stretching and heat setting are as follows:

the modified polyester industrial yarn has the filament number of 4.5dtex, the multifilament number of 1500dtex, the breaking strength of 8.4cN/dtex, the linear density deviation rate of 1.5 percent, the breaking strength CV value of 2.8 percent, the elongation at break of 16.0 percent, the elongation at break CV value of 8.0 percent, the elongation at 4.0cN/dtex load of 7.0 percent, the dry heat shrinkage rate of 7.5 percent under the conditions of 177 ℃ multiplied by 10min multiplied by 0.05cN/dtex, the network degree of 8/m, the oil content of 0.8wt percent, the dye uptake of 87.6 percent under the temperature condition of 130 ℃, the K/S value of 23.87 and the color fastness of 4 grades;

(3) preparing a colored polyester hoisting belt;

the colored polyester hoisting belt is prepared by stranding, dyeing, antistatic finishing, ultraviolet-resistant finishing, weaving, core threading and sewing the modified polyester industrial yarn, the stranding process parameters are the same as those of the embodiment 3, the dyeing adopts a high-temperature high-pressure dyeing method, the dye solution is a disperse dye solution, the concentration of the dye solution is 3 wt%, the pH value is 5, the dyeing temperature is 130 ℃, the pressure is 0.31MPa, and the time is 2 hours; adopting a one-dipping one-rolling process for antistatic finishing and ultraviolet-resistant finishing, wherein the dipping temperature is 65 ℃, the time is 10s, the temperature of a roller is 80 ℃, the pressure is 2.7MPa, the drying temperature after padding is 100 ℃, the time is 5min, the baking temperature after padding is 170 ℃, and the time is 7 min; the antistatic finishing adopts SiO₂The polysorbate-80 finishing liquid adopts an anti-ultraviolet finishing agent SCJ-966 for anti-ultraviolet finishing, and the process parameters of weaving, core threading and sewing are the same as those of example 3.

The finally prepared colored polyester lifting belt mainly comprises modified polyester industrial yarns, the warp-wise loop tissue density of the colored polyester lifting belt is 180 pieces/10 cm, the weft-wise loop tissue density is 80 pieces/10 cm, the breaking strength is 62000N, the breaking elongation is 19%, the tensile elastic recovery rate is 84%, the safety coefficient is 8.0, and the UV-A transmittance is 2.7%.

Example 7

(1) preparing modified polyester;

(1.1) synthesizing 2,2,5, 5-tetramethyl-3, 4-hexanediol by the following steps: firstly, mixing a 2, 2-methylpropionaldehyde solution with the concentration of 340g/L and a dilute sulfuric acid solution with the concentration of 260g/L according to the molar ratio of the 2, 2-methylpropionaldehyde to sulfuric acid of 1.5:1, adding the mixture into a cathode electrolytic cell, then cooling the mixed solution to 13 ℃, carrying out electrolytic reduction to the concentration of the 2, 2-methylpropionaldehyde of 9.5 wt%, and finally carrying out cooling crystallization, separation and purification, wherein a reaction device and a reaction chemical equation adopted in the synthesis process are consistent with those of example 1, and the structural formula of the prepared 2,2,5, 5-tetramethyl-3, 4-hexanediol is shown as a formula (I), wherein R in the formula₂is-H;

(1.2) preparing 3-trimethylsilyl-3, 3-dimethyl-1, 2-propanediol;

(a) mixing 3-trimethylsilyl-3, 3-dimethylpropene, peracetic acid and dichloromethane according to the molar ratio of 1:5:15, reacting for 7 hours at the temperature of 37 ℃, stirring during the reaction, removing the solvent after the reaction is finished, and purifying and refining to obtain trimethylsilyl propylene epoxide;

(b) mixing water, concentrated sulfuric acid and trimethylsilyl propylene epoxide, heating in water bath to 82 ℃ under stirring, carrying out heat preservation reaction for 12min, cooling to room temperature after the reaction is finished, and carrying out neutralization, distillation, separation and purification to obtain dihydric alcohol with trimethylsilyl lateral groups shown in formula II), R in formula II₁is-C ((CH)₃)₂) The concentrated sulfuric acid is sulfuric acid with the mass concentration of 70%, the molar ratio of the trimethylsilyl propylene epoxide to water is 1:29 when the reaction starts, and the mass of the concentrated sulfuric acid accounts for 0.13% of the mass sum of the mixture;

(1.3) esterification reaction;

preparing terephthalic acid, ethylene glycol, 3-trimethylsilyl-3, 3-dimethyl-1, 2-propanediol and 2,2,5, 5-tetramethyl-3, 4-hexanediol 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 normal pressure, the esterification reaction temperature is 258 ℃, the esterification reaction end point is determined when the distilled water amount in the esterification reaction reaches 95% of a theoretical value, wherein the molar ratio of the terephthalic acid to the ethylene glycol to the 3-trimethylsilyl-3, 3-dimethyl-1, 2-propanediol to the 2,2,5, 5-tetramethyl-3, 4-hexanediol is 1:1.2:0.014:0.015, and the adding amounts of the antimony trioxide to the titanium dioxide to the trimethyl phosphate are respectively 0.04 wt% of the adding amount of the terephthalic acid, and 0.04 wt% of the adding amount of the trimethyl phosphate, 0.20 wt% and 0.04 wt%;

(1.4) a polycondensation reaction;

(2) preparing modified polyester industrial yarn;

the technological parameters of stretching and heat setting are as follows:

the modified polyester industrial yarn has the filament number of 5.5dtex, the multifilament number of 1200dtex, the breaking strength of 8.5cN/dtex, the linear density deviation rate of 1.5%, the breaking strength CV value of 3.0%, the elongation at break of 12.0%, the elongation at break CV value of 8.0%, the elongation at 4.0cN/dtex load of 6.5%, the dry heat shrinkage rate under the conditions of 177 ℃ multiplied by 10min multiplied by 0.05cN/dtex of 9.2%, the network degree of 5/m, the oil content of 0.4 wt%, the dyeing rate under the temperature condition of 130 ℃ of 93.2%, the K/S value of 26.32 and the color fastness of 4 grades;

(3) preparing a colored polyester hoisting belt;

the colored polyester hoisting belt is prepared by stranding, dyeing, antistatic finishing, ultraviolet-resistant finishing, weaving, core threading and sewing the modified polyester industrial yarn, the stranding process parameters are the same as those of the embodiment 1, the dyeing adopts a high-temperature high-pressure dyeing method, the dye solution is a disperse dye solution, the concentration of the dye solution is 2.5 wt%, the pH value is 4.5, the dyeing temperature is 130 ℃, the pressure is 0.28MPa, and the time is 1.6 h; adopting a one-dipping one-rolling process for antistatic finishing and ultraviolet-resistant finishing, wherein the dipping temperature is 80 ℃, the time is 20s, the temperature of a roller is 100 ℃, the pressure is 2.5MPa, the drying temperature after padding is 85 ℃, the time is 3min, the baking temperature after padding is 160 ℃, and the time is 8 min; the antistatic finishing adopts SiO₂The polysorbate-80 finishing liquid adopts an anti-ultraviolet finishing agent SCJ-966 for anti-ultraviolet finishing, and the process parameters of weaving, core threading and sewing are the same as those of example 1.

The finally prepared colored polyester hoisting belt mainly comprises modified polyester industrial yarns, the warp-wise loop tissue density of the colored polyester hoisting belt is 150 pieces/10 cm, the weft-wise loop tissue density is 60 pieces/10 cm, the breaking strength is 60800N, the elongation at break is 18%, the elastic recovery rate of the stretching is 81%, the safety coefficient is 8.2, and the UV-A transmittance is 1.7%.

Claims

1. The preparation method of the colored polyester hoisting belt is characterized by comprising the following steps: stranding, dyeing, antistatic finishing, ultraviolet-resistant finishing, weaving, core threading and sewing the modified polyester industrial yarns to obtain a colored polyester hoisting belt;

the molar ratio of terephthalic acid to ethylene glycol to the diol with trimethylsilyl side groups to the hexanediol with t-butyl side groups is 1: 1.2-2.0: 0.01-0.02: 0.01-0.015;

in the formula, R₁is-CH₂-、-CH(CH₃) -or-C ((CH)₃)₂)-；

The structural formula of hexanediol with tert-butyl side groups is as follows:

in the formula, R₂is-H, -CH₂CH₃or-C (CH)₃)₃。

2. The method for preparing the colored terylene hoisting belt according to claim 1, wherein the synthesis of the diol with the trimethylsilyl group side group comprises the following steps:

r in the structural formula of the hexanediol with the tertiary butyl side group₂is-H, -CH₂CH₃and-C (CH)₃)₃In this case, the raw material A is 2, 2-methylpropionaldehyde, 2-dimethyl-3-pentanone, and 2,2,4, 4-tetramethyl-3-pentanone, respectively.

3. The preparation method of the colored polyester hoisting belt according to claim 2, wherein the preparation steps of the modified polyester before solid-phase polycondensation and tackifying are as follows:

(1) performing esterification reaction;

(2) performing polycondensation reaction;

4. The method for preparing the colored polyester hoisting belt according to claim 3, wherein 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.

5. The method for preparing a colored polyester hoisting belt according to claim 4, wherein the catalyst is antimony trioxide, ethylene glycol antimony or antimony acetate, the matting agent is titanium dioxide, and the stabilizer is triphenyl phosphate, trimethyl phosphate or trimethyl phosphite.

6. The preparation method of the colored polyester hoisting belt according to claim 1, wherein the intrinsic viscosity of the modified polyester after solid phase polycondensation and tackifying is 1.0-1.2 dL/g.

7. The preparation method of the colored polyester hoisting belt according to claim 1, wherein the spinning process parameters of the modified polyester industrial yarns are as follows:

the technological parameters of stretching and heat setting are as follows:

8. The colored polyester hoisting belt prepared by the preparation method of the colored polyester hoisting belt according to any one of claims 1 to 7, which is characterized in that: the modified polyester yarn mainly comprises modified polyester industrial yarn, wherein a molecular chain of the modified polyester comprises a terephthalic acid chain segment, an ethylene glycol chain segment, a dihydric alcohol chain segment with a trimethylsilyl lateral group and a hexanediol chain segment with a tert-butyl lateral group.

9. The colored polyester hoisting belt according to claim 8, wherein the modified polyester industrial yarn has a single fiber fineness of 3.0 to 6.0dtex, a multifilament fineness of 1100 to 1500dtex, a breaking strength of not less than 8.3cN/dtex, a linear density deviation ratio of ± 1.5%, a breaking strength CV value of not more than 3.0%, an elongation at break of 12.0 to 16.0%, an elongation at break CV value of not more than 8.0%, an elongation at 4.0cN/dtex load of 5.5 to 7.0%, a dry heat shrinkage ratio under 177 ℃ x 10min x 0.05cN/dtex condition of 2.8 to 9.2%, a network degree of (5 to 8 ± 2/m, an oil content of 0.6 ± 0.2 wt%, an dye uptake under 130 ℃ temperature condition of 87.6 to 93.2%, a K/S value of 23.87 to 26.32, and a color fastness of 4 grade.

10. The colored polyester sling according to claim 8, wherein the colored polyester sling has a warp-wise loop structure density of 160 ± 20 pieces/10 cm, a weft-wise loop structure density of 70 ± 10 pieces/10 cm, a breaking strength of not less than 58800N, an elongation at break of less than 20%, a tensile elastic recovery of more than 80%, a safety factor of not less than 8.0, and a UV-a transmittance of 1.7 to 3.0%.