CN113699603A - Preparation method of heat-preservation porous fine denier fiber - Google Patents
Preparation method of heat-preservation porous fine denier fiber Download PDFInfo
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- CN113699603A CN113699603A CN202110970386.9A CN202110970386A CN113699603A CN 113699603 A CN113699603 A CN 113699603A CN 202110970386 A CN202110970386 A CN 202110970386A CN 113699603 A CN113699603 A CN 113699603A
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/24—Formation of filaments, threads, or the like with a hollow structure; Spinnerette packs therefor
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D13/00—Complete machines for producing artificial threads
- D01D13/02—Elements of machines in combination
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/08—Melt spinning methods
- D01D5/088—Cooling filaments, threads or the like, leaving the spinnerettes
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/08—Melt spinning methods
- D01D5/096—Humidity control, or oiling, of filaments, threads or the like, leaving the spinnerettes
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F11/00—Chemical after-treatment of artificial filaments or the like during manufacture
- D01F11/04—Chemical after-treatment of artificial filaments or the like during manufacture of synthetic polymers
- D01F11/08—Chemical after-treatment of artificial filaments or the like during manufacture of synthetic polymers of macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
- D01F6/62—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyesters
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- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Artificial Filaments (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
Abstract
The invention discloses a preparation method of heat-preservation porous fine denier fiber, which comprises the following steps of: the PET polyester melt is obtained by carrying out chemical reaction on purified terephthalic acid and PTA, ethylene glycol and a catalyst, and the viscosity of the PET polyester melt is 0.60-0.625 dl/g; step two, the production flow is as follows: preparing a heat-insulating porous fine denier fiber by a booster pump → a melt distribution valve → a spinning box → a metering pump melt extrusion → a spinning assembly → cooling molding → single oil nozzle oiling → a spinning channel → a pre-network → GR1 godet → GR2 godet → winding molding → mechanical doffing → quality inspection; wherein the PET polyester melt is conveyed into a melt distribution valve at a flow rate of 189-193T by a booster pump. The heat-insulating porous fine denier fiber with light weight, heat insulation and soft hand feeling ensures that the hand feeling is softer, reduces the breakage rate and has better heat-insulating effect.
Description
The technical field is as follows:
the invention relates to the technical field of polyester filament yarn production, in particular to a preparation method of heat-preservation porous fine denier fibers.
Background art:
since the invention of polyethylene terephthalate (PET) fiber, its yield has become the top quality synthetic fiber in the world due to its excellent properties that have been rapidly developed. The PET fiber has a series of excellent performances of high breaking strength, high elastic modulus, moderate resilience, good heat setting performance, heat resistance, light resistance, acid resistance, alkali resistance, corrosion resistance and the like, the prepared fabric has crease resistance, the PET fiber is widely applied to fibers, bottle packages, films and sheets in the textile field, the yield is increased year by year, and the industrial position is obviously improved. However, the existing PET fiber generally only meets the requirement of one aspect of light-temperature moisture absorption performance, and the PET fiber which meets the light-temperature moisture absorption function has less research and immature process. Particularly, with the restart of silk roads, the differentiation technology of polyester fibers is certainly a key concern of chemical fiber enterprises, and the differentiation fibers are from japan early, and generally speaking are chemical fibers which are innovative to conventional chemical fibers or have certain characteristics. The differentiated fiber mainly aims at improving the performance of the fabric, is biased to clothes and decorative fabrics, is new and fashionable along with the continuous change of the consumption concept of people and the pursuit of comfort, high-grade, health care, nature and the like, and is diversified and functional in the pursuit of clothes, so that some novel differentiated fibers are popular.
In recent years, the same-plate double-profiled fiber or the same-plate multi-profiled fiber is an important means for solving the defects of the existing profiled fiber, and the advantages of two or more profiled fibers can be combined to meet the requirements of high quality and high performance of profiled fiber textiles. Diversified requirements. Although the literature and patents have studied two-ply fibers on the same spinneret or two-ply fibers on the same spinneret, such fibers have certain difficulties in practical production. Since the polyester melt is a non-newtonian fluid, it is a viscoelastic fluid. When it flows viscously in the spinning hole, it will deform elastically and form a certain pressure. Therefore, the polyester melt flows out after the spinning holes. Certain pressure drop can be generated in the spinning process, and the shape, size, length and mutual relation of the spinning holes have great influence on the pressure drop. The prior art has generally considered only the shape or cross-sectional area of the spinning aperture. The same, but not related to the shape, size and length of the interaction, which will result in the pressure drop of the polyester melt flowing out of different shaped spinning holes in the same spinneret, thus producing different cross-section fibers. The extrusion speed of the two materials is different, which influences the smooth spinning process.
The invention content is as follows:
the invention aims to solve the technical problem of providing a preparation method of heat-insulating porous fine denier fiber with light heat insulation and soft hand feeling.
The technical proposal of the invention is that a preparation method of heat-preservation porous fine denier fiber comprises the following steps,
firstly, raw material selection: the PET polyester melt is obtained by carrying out chemical reaction on purified terephthalic acid and PTA, ethylene glycol and a catalyst, and the viscosity of the PET polyester melt is 0.60-0.625 dl/g;
step two, the production flow is as follows: preparing a heat-insulating porous fine denier fiber by a booster pump → a melt distribution valve → a spinning box → a metering pump melt extrusion → a spinning assembly → cooling molding → single oil nozzle oiling → a spinning channel → a pre-network → GR1 godet → GR2 godet → winding molding → mechanical doffing → quality inspection; wherein the PET polyester melt is conveyed into a melt distribution valve at a flow rate of 189-193T by a booster pump; 250-300 hollow spinneret orifices are arranged on a spinneret plate on the spinning component, and the size of each hollow spinneret orifice is 0.15 x0.50mm; during oiling, oiling the tow by an oil nozzle with the caliber of 0.6x1mm and a POY superfine denier oiling agent, and adding crown ether into the POY superfine denier oiling agent to form a mixed oiling agent, wherein the ratio of the crown ether to the POY superfine denier special oiling agent is 1:2-1: 1.5; in the spinning process, the temperature of a box body is 275-286 ℃, the circular blowing air pressure is 5-15 pa, the humidity reaches more than 85%, and the circular blowing air temperature is controlled at 20-23 ℃; the pressure of the pre-network is 0.6-0.8 kg, the spinning speed is 2660-2750 m/min, the winding overfeeding is 3-5% and the winding tension is 10-18 g in the winding forming process;
step three, assembly line packaging: and packaging the prepared heat-preservation porous fine denier fiber through a production line. The content of crown ether in the oil agent needs to be kept within a certain range, the addition amount of crown ether is too low, the oil agent with low viscosity, good heat resistance and high oil film strength cannot be obtained, and if the addition amount of crown ether is too large, other performance indexes of the oil agent are influenced. The crown ether is introduced into the oil agent to obtain the oil agent with low viscosity, good heat resistance and high oil film strength. Crown ethers are heterocyclic organic compounds containing multiple ether groups and crown ethers. The wetting ability of the surfactant is higher than that of a corresponding open-chain compound, the crown ether has better solubilization, the solubility of the salt compound in the organic matter is lower, but the solubility of the salt compound in the organic matter is reduced by adding the crown ether. The solubility is increased. The main reason of higher viscosity of the oil agent in the prior art is that the oil agent contains common polyester compounds or polyether compounds. Due to molecular weight and the presence of hydrogen bonds, the intermolecular effect of compounds is manifested as kinematic viscosity. The crown ether has low viscosity and is a small beaded molecule, so that the compatibility of the crown ether and polyether is good. In the ester compound or polyether oil system, molecular chains between the polyester compound or polyether compound are simultaneously inserted to shield the interaction between the molecular chains, thereby reducing the viscosity of the oil system. In addition, the crown ether has a higher volatile point and excellent heat resistance stability, and the heat resistance of the oil agent after the crown ether is introduced is also obviously improved.
Preferably, the viscosity of the PET polyester melt in the first step is 0.615 dl/g.
Preferably, the equivalent diameter of the hollow spinneret orifice is 0.10 to 0.32 mm.
Preferably, the capillary parameter of the insulating porous fine fibers is not less than 0.10. The capillary parameter of the light heat-insulating fiber is not less than 0.10, the capillary parameter of a conventional product is 0.03-0.04, and due to the existence of the conventional product, the capillary parameter of the fiber produced by the method is obviously improved, so that the thermal resistance of the fiber fabric is more excellent than that of the conventional product, and good heat retention property can be provided.
Preferably, the thermal weight loss of the oil agent after heat treatment at 275-286 ℃ is less than 18%. The crown ether has higher volatile point and excellent thermal stability, and the heat resistance of the oil after the crown ether is introduced is also obviously improved.
Preferably, the oil film strength of the mixed oil agent is 125-132N. After the crown ether is introduced into the oil agent, the compatibility of the crown ether and the polyester or polyether is better. Simultaneously enter molecular chains of polyester compounds or polyether compounds to shield acting force among the molecular chains, thereby reducing the viscosity of an oil system; the oil film strength of the oil agent is 125-132N, the oil film strength of the oil agent in the prior art is lower, generally about 110N, and the antistatic agent of the chemical fiber oil agent mainly contains metal ions or exists in a salt form. The compatibility of the antistatic agent and the polyester compound or polyether compound in the oil agent is poor, and the crown ether can improve the oil film strength mainly due to the salt dissolution effect after the crown ether is added, so that the antistatic agent and the polyester compound are improved. Compatibility of the compound or polyether, thereby increasing the strength of the oil film.
Preferably, the static friction coefficient of the oiled fiber and the metal is 0.202-0.210, and the dynamic friction coefficient is 0.320-0.332.
Preferably, the mixed oil agent further comprises mineral oil, potassium phosphate salt, trimethylolpropane laurate and sodium alkyl sulfonate. The mineral oil is 12# mineral oil, the potassium phosphate salt is dodecyl phosphate potassium salt, and the sodium alkyl sulfonate is sodium dodecyl sulfate.
Further, the crown ether is 2-hydroxymethyl-12-crown-4, 15-crown-5 or 2-hydroxymethyl-15-crown-5.
The preparation method of the heat-preservation porous fine-denier fiber has the beneficial effects that firstly, the aperture of the spinneret orifice on the original spinneret plate is changed from 0.19x0.51mm to 0.15x0.50mm, the number of the spinneret orifices is increased from 192 to 250-300, 192 monofilaments are contained in the original bundle of porous fine-denier fiber, and the number of the monofilaments contained in the original bundle of low-orientation porous fine-denier fiber is increased to 250-300 monofilaments, so that the hand feeling of the prepared fabric or clothes is softer; secondly, the caliber of the original oil nozzle is changed, 250-300 monofilaments can be flatly spread and unfolded at the oil nozzle as much as possible to uniformly receive oil, and bundling and cohesion lines can be formed at the position away from the oil nozzle; thirdly, as the number of the spinneret holes is increased, the number of the filaments of the fiber is increased, and certain difficulty is caused to subsequent processing after the number of the filaments of the fiber is increased, i.e., a large number of end-breaks, to solve the technical problem changes the way that the original pre-network processing is processed after the GR1 godet, pre-network treatment is carried out before GR1 godet, so that the filament bundle passes through the pre-network firstly, after cohesive force is increased, then passes through the godet, the friction force between the tows and the godet is reduced, the problem of difficult end-up is solved, the phenomenon of winding the godet is eliminated, and the effect of reducing the end-breaking rate by 35 percent is achieved, in addition, most importantly, during oiling, crown ether is also added into the POY superfine denier oil to form a mixed oil, so that the heat resistance and the lubricity of the oil are improved, the end breakage rate is finally reduced, and the excellent rate is improved.
The specific implementation mode is as follows:
the invention is further illustrated with respect to specific embodiments below:
example 1
A preparation method of heat-preservation porous fine denier fiber comprises the following steps,
firstly, raw material selection: pure terephthalic acid and PET polyester melt obtained by chemical reaction of PTA, ethylene glycol and catalyst, wherein the viscosity of the PET polyester melt is 0.615 dl/g;
step two, the production flow is as follows: preparing a heat-insulating porous fine denier fiber by a booster pump → a melt distribution valve → a spinning box → a metering pump melt extrusion → a spinning assembly → cooling molding → single oil nozzle oiling → a spinning channel → a pre-network → GR1 godet → GR2 godet → winding molding → mechanical doffing → quality inspection; wherein the PET polyester melt is delivered into the melt distribution valve at a flow rate of 192T by a booster pump; 268 hollow spinneret orifices are arranged on a spinneret plate on the spinning component, and the size of each hollow spinneret orifice is 0.15 x0.50mm; during oiling, oiling the tow by an oil nozzle with the caliber of 0.6x1mm and a POY superfine denier oiling agent, and adding crown ether into the POY superfine denier oiling agent to form a mixed oiling agent, wherein the ratio of the crown ether to the POY superfine denier special oiling agent is 1: 3; in the spinning process, the temperature of a box body is 279 ℃, the circular blowing air pressure is 11pa, the humidity reaches more than 85 percent, and the circular blowing air temperature is controlled at 21 ℃; the pressure of the pre-net is 0.7kg, the spinning speed is 2700m/min, the winding overfeed is 4 percent, and the winding tension is 16g in the winding forming process;
step three, assembly line packaging: and packaging the prepared heat-preservation porous fine denier fiber through a production line. The content of crown ether in the oil agent needs to be kept within a certain range, the addition amount of crown ether is too low, the oil agent with low viscosity, good heat resistance and high oil film strength cannot be obtained, and if the addition amount of crown ether is too large, other performance indexes of the oil agent are influenced. The crown ether is introduced into the oil agent to obtain the oil agent with low viscosity, good heat resistance and high oil film strength. Crown ethers are heterocyclic organic compounds containing multiple ether groups and crown ethers. The wetting ability of the surfactant is higher than that of a corresponding open-chain compound, the crown ether has better solubilization, the solubility of the salt compound in the organic matter is lower, but the solubility of the salt compound in the organic matter is reduced by adding the crown ether. The solubility is increased. The main reason of higher viscosity of the oil agent in the prior art is that the oil agent contains common polyester compounds or polyether compounds. Due to molecular weight and the presence of hydrogen bonds, the intermolecular effect of compounds is manifested as kinematic viscosity. The crown ether has low viscosity and is a small beaded molecule, so that the compatibility of the crown ether and polyether is good. In the ester compound or polyether oil system, molecular chains between the polyester compound or polyether compound are simultaneously inserted to shield the interaction between the molecular chains, thereby reducing the viscosity of the oil system. In addition, the crown ether has a higher volatile point and excellent heat resistance stability, and the heat resistance of the oil agent after the crown ether is introduced is also obviously improved.
The equivalent diameter of the hollow spinneret orifice is 0.17mm, the capillary parameter of the heat-preservation porous fine denier fiber is 0.13, and the thermal weight loss of the oil agent is about 15% after the oil agent is subjected to heat treatment at 275-286 ℃. The crown ether has higher volatile point and excellent thermal stability, and the heat resistance of the oil after the crown ether is introduced is also obviously improved. The oil film strength of the mixed oil agent was 125-132N. After the crown ether is introduced into the oil agent, the compatibility of the crown ether and polyester or polyether is better, the static friction coefficient of the oiled fiber and metal is 0.205, and the dynamic friction coefficient is 0.322. The mineral oil is 12# mineral oil, the potassium phosphate salt is dodecyl phosphate potassium salt, and the sodium alkyl sulfonate is sodium dodecyl sulfate. Further, the crown ether is 2-hydroxymethyl-15-crown-5.
More specifically, the oil preparation method comprises the following steps: mixing crown ether with potassium phosphate, trimethylolpropane laurate and sodium alkyl sulfonate, adding the mixture into mineral oil, and uniformly stirring to obtain a mixed oil agent, wherein the adding amount of each component is as follows: 5 parts of mineral oil; 10 parts of trimethylolpropane laurate; 130 parts of crown ether; 3 parts of potassium phosphate salt; 3 parts of sodium alkylsulfonate; the special oil agent L-165 for POY super fine denier imported from Germany is prepared by stirring at normal temperature, wherein the stirring temperature is 35 ℃ and the stirring time is 1-3 hours.
The following is a list of various performance indexes of the low-orientation porous fine denier fiber prepared by the preparation method designed by the invention:
| detecting items | Unit of | Actual inspection data |
| Linear density of | dtex/F | 197dtex/288F |
| Rate of deviation of linear density | ％ | ±2.00 |
| Coefficient of variation of linear density CV value | ％ | ≤0.70 |
| Breaking strength | CN/dtex | ≥3.50 |
| Coefficient of variation CV value of breaking strength | ％ | ≤4.1.00 |
| Elongation at break | ％ | 127.0±3.0 |
| Yarn evenness unevenness CV value | ％ | ≤1.10 |
| Oil content | ％ | 0.25±0.10 |
The invention designs a preparation method of heat-preservation porous fine denier fiber by adopting the invention, firstly, the aperture of the spinneret orifice on the original spinneret plate is changed from the conventional 0.19x0.51mm to 0.15x0.50mm, the number of the spinneret orifice is increased from 192 to 250-300, the original bundle of porous fine denier fiber contains 192 monofilaments, and the original bundle of low-orientation porous fine denier fiber contains 250-300 monofilaments, so that the hand feeling of the prepared fabric or clothes is softer; secondly, the caliber of the original oil nozzle is changed, 250-300 monofilaments can be flatly spread and unfolded at the oil nozzle as much as possible to uniformly receive oil, and bundling and cohesion lines can be formed at the position away from the oil nozzle; thirdly, as the number of the spinneret holes is increased, the number of the filaments of the fiber is increased, and certain difficulty is caused to subsequent processing after the number of the filaments of the fiber is increased, i.e., a large number of end-breaks, to solve the technical problem changes the way that the original pre-network processing is processed after the GR1 godet, pre-network treatment is carried out before GR1 godet, so that the filament bundle passes through the pre-network firstly, after cohesive force is increased, then passes through the godet, the friction force between the tows and the godet is reduced, the problem of difficult end-up is solved, the phenomenon of winding the godet is eliminated, and the effect of reducing the end-breaking rate by 35 percent is achieved, in addition, most importantly, during oiling, crown ether is also added into the POY superfine denier oil to form a mixed oil, so that the heat resistance and the lubricity of the oil are improved, the end breakage rate is finally reduced, and the excellent rate is improved.
Those skilled in the art will recognize that these features can be combined, modified or interchanged as appropriate to arrive at further embodiments of the invention.
The foregoing is illustrative of the preferred embodiments of the present invention only and is not to be construed as limiting the claims. All equivalent process changes made by the present specification are included in the scope of the present invention.
Claims (9)
1. A preparation method of heat-preservation porous fine denier fiber is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
firstly, raw material selection: the PET polyester melt is obtained by carrying out chemical reaction on purified terephthalic acid and PTA, ethylene glycol and a catalyst, and the viscosity of the PET polyester melt is 0.60-0.625 dl/g;
step two, the production flow is as follows: preparing a heat-insulating porous fine denier fiber by a booster pump → a melt distribution valve → a spinning box → a metering pump melt extrusion → a spinning assembly → cooling molding → single oil nozzle oiling → a spinning channel → a pre-network → GR1 godet → GR2 godet → winding molding → mechanical doffing → quality inspection; wherein the PET polyester melt is conveyed into a melt distribution valve at a flow rate of 189-193T by a booster pump; 250-300 hollow spinneret orifices are arranged on a spinneret plate on the spinning component, and the size of each hollow spinneret orifice is 0.15 x0.50mm; during oiling, oiling the tow by an oil nozzle with the caliber of 0.6x1mm and a POY superfine denier oiling agent, and adding crown ether into the POY superfine denier oiling agent to form a mixed oiling agent, wherein the ratio of the crown ether to the POY superfine denier special oiling agent is 1:2-1: 1.5; in the spinning process, the temperature of a box body is 275-286 ℃, the circular blowing air pressure is 5-15 pa, the humidity reaches more than 85%, and the circular blowing air temperature is controlled at 20-23 ℃; the pressure of the pre-network is 0.6-0.8 kg, the spinning speed is 2660-2750 m/min, the winding overfeeding is 3-5% and the winding tension is 10-18 g in the winding forming process;
step three, assembly line packaging: and packaging the prepared heat-preservation porous fine denier fiber through a production line.
2. The method for preparing the heat-insulating porous fine denier fiber according to claim 1, wherein the method comprises the following steps: the viscosity of the PET polyester melt in the first step was 0.615 dl/g.
3. The method for preparing the heat-insulating porous fine denier fiber according to claim 1, wherein the method comprises the following steps: the equivalent diameter of the hollow spinneret orifice is 0.10-0.32 mm.
4. The method for preparing the heat-insulating porous fine denier fiber according to claim 1, wherein the method comprises the following steps: the capillary parameter of the heat-preservation porous fine denier fiber is not less than 0.10.
5. The method for preparing the heat-insulating porous fine denier fiber according to claim 1, wherein the method comprises the following steps: the thermal weight loss of the oil agent after heat treatment at 275-286 ℃ is less than 18%.
6. The method for preparing the heat-insulating porous fine denier fiber according to claim 1, wherein the method comprises the following steps: the oil film strength of the mixed oil agent was 125-132N.
7. The method for preparing the heat-insulating porous fine denier fiber according to claim 1, wherein the method comprises the following steps: after oiling, the static friction coefficient of the fiber and the metal is 0.202-0.210, and the dynamic friction coefficient is 0.320-0.332.
8. The method for preparing the heat-insulating porous fine denier fiber according to claim 1, wherein the method comprises the following steps: the mixed oil agent also comprises mineral oil, potassium phosphate, trimethylolpropane laurate and alkyl sodium sulfonate.
9. The method for preparing the heat-insulating porous fine denier fiber according to claim 1, wherein the method comprises the following steps: the crown ether is 2-hydroxymethyl-12-crown-4, 15-crown-5 or 2-hydroxymethyl-15-crown-5.
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Application publication date: 20211126 |