CN112647310A - Method for manufacturing polyamide 56 dipped cord fabric with high residual dry heat shrinkage force - Google Patents
Method for manufacturing polyamide 56 dipped cord fabric with high residual dry heat shrinkage force Download PDFInfo
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- D06N3/04—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06N3/10—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds with styrene-butadiene copolymerisation products or other synthetic rubbers or elastomers except polyurethanes
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- D06N3/0002—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate
- D06N3/0006—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate using woven fabrics
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- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0002—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate
- D06N3/0015—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate using fibres of specified chemical or physical nature, e.g. natural silk
- D06N3/0034—Polyamide fibres
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- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/007—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by mechanical or physical treatments
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- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/007—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by mechanical or physical treatments
- D06N3/0077—Embossing; Pressing of the surface; Tumbling and crumbling; Cracking; Cooling; Heating, e.g. mirror finish
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- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0086—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the application technique
- D06N3/0088—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the application technique by directly applying the resin
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- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
Abstract
The invention provides a method for manufacturing polyamide 56 dipped cord fabric with high residual dry heat shrinkage force, which comprises the following steps: (1) twisting the polyamide 56 fiber on a straight twisting machine to prepare a twisted wire; (2) weaving the twisted threads by a weaving machine, and controlling the uniformity of the cloth surface by a filament inserting spindle tension control device to prepare white blank cord fabric; (3) and (3) dipping and performing heat treatment on the white blank cord fabric by using a dipping glue solution to obtain the polyamide 56 dipped cord fabric with high residual dry heat shrinkage. The invention adopts the dipping process of drying, high-power stretching heat treatment and proper retraction heat setting by extremely low drawing tension, the strength of the dipped cord fabric prepared by the method is high and can reach 6.5-8.0cN/dtex, the residual dry heat shrinkage force after heating for 180-15 min is more than 4.0mN/tex, the elongation at break of the cord is 22-30%, and the flat spot phenomenon of the tire can be improved or eliminated.
Description
Technical Field
The invention relates to a dipped cord fabric which can be used for a tire framework material, in particular to a method for manufacturing a polyamide 56 dipped cord fabric with high residual dry heat shrinkage force.
Background
Modern tires are composed primarily of rubber and a carcass material. The tire plays a role of supporting the weight of the vehicle body, providing ground friction, providing driving force and braking force in the automobile. The tires are divided according to the structure and mainly divided into bias tires, belt bias tires and radial tires. The radial tire has the advantages that the radial tire is widely applied due to the advantages of easier bending, less generated heat, lower rolling resistance, better high-speed performance and the like, almost all the conventional passenger automobile tires are radial tires, and in the radial tire body structure, framework materials mainly comprise a tire body cord fabric, a belt ply cord fabric and a cap ply cord fabric.
The flat spot phenomenon commonly exists in the tyres of passenger cars, and the main reason of the flat spot phenomenon comes from the fiber framework material. When a vehicle is parked at a high ambient temperature for a long time, a flat deformation close to the level of a ground plane is generated at a contact part of a tire and the ground, when the tire is restarted, the tire shakes due to the difference of the radius and the size and the shape of the contact part of the tire and other parts, the size difference and the shake gradually disappear along with the running and the temperature of the tire, the phenomenon is called a flat spot phenomenon, the flat spot phenomenon reduces the riding comfort and the operability of the tire, and the common scheme is that when the tire is parked, the pressure of the tire can be increased so as to reduce the ground contact area of the tire.
The essence is that the tyre load makes the frame material generate cord line stretch, at the same time, the tyre rotation can generate centrifugal force to make the cord line expand outwards, when the tyre is run, the frame material and rubber produce heat, after the temperature is higher than glass transition temperature Tg, the nylon or polyester cord line can produce contraction force, the total expansion force and contraction force are opposite, at this time, the expansion force is used as main body, the cord line deforms and stretches, when the tyre is stopped running under higher temperature, the centrifugal force disappears instantaneously, the contraction force is reduced along with the temperature reduction, the cord line can be restored to be close to original state, in the course of cooling the tyre and cord line to room temperature, if the contraction force is reduced too fast (namely the residual contraction force is too small or zero), the flat spot phenomenon is easily produced, under the same load, the residual contraction force is too small or zero, the modulus is reduced too fast, the deformation is larger, the residual contraction force is properly increased to reduce the deformation, helping to eliminate or improve the flat spot phenomenon.
At present, the gum dipping cord fabric applicable to radial tire crown belts in the prior art has poor effect of eliminating flat spot phenomenon and small numerical value of high residual dry heat shrinkage force.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a method for manufacturing polyamide 56 dipped cord fabric with high residual dry heat shrinkage force, which can improve or eliminate the flat spot phenomenon of a tire. The technical scheme adopted by the invention is as follows:
a manufacturing method of polyamide 56 dipped cord fabric with high residual dry heat shrinkage force comprises the following steps:
(1) twisting: twisting the polyamide 56 fiber on a straight twisting machine to prepare a twisted wire;
(2) weaving: weaving the twisted threads by a weaving machine, and controlling the uniformity of the cloth surface by a filament inserting spindle tension control device to prepare white blank cord fabric;
(3) gum dipping: and (3) carrying out gum dipping and heat treatment on the white blank cord fabric for 2-10 min by using gum dipping glue solution to obtain the polyamide 56 gum dipping cord fabric with high residual dry heat shrinkage force.
Preferably, in the method for manufacturing the polyamide 56 dipped cord fabric with high residual dry heat shrinkage, the polyamide 56 fiber in the step (1) is an industrial high-strength fiber, and the fiber strength is 8.0-9.0 cN/dtex.
Preferably, the method for manufacturing the polyamide 56 dipped cord fabric with high residual dry heat shrinkage force is used, wherein the twist degree of the twisted yarn in the step (1) is 330-.
Preferably, in the step (2), the high residual dry heat shrinkage force polyamide 56 dipped cord fabric is woven in a reeding and threading manner, the yarn twisting bobbin creel controls the tension uniformity of the cloth surface through a yarn inserting spindle tension control device, and the yarn inserting spindle tension control device comprises a yarn inserting bobbin, a tension spring and a felt gasket.
Preferably, in the method for manufacturing the polyamide 56 dipped cord fabric with high residual dry heat shrinkage force, the white blank cord fabric in the step (3) sequentially passes through a dipping tank, a drying area, a hot stretching area and a heat setting area.
Preferably, the method for manufacturing the polyamide 56 dipped cord fabric with high residual dry heat shrinkage force comprises the step (3) of sequentially passing the white blank cord fabric through a drying zone, a dipping tank, a drying zone, a hot stretching zone and a heat setting zone.
Preferably, the manufacturing method of the polyamide 56 dipped cord fabric with high residual dry heat shrinkage force is adopted, wherein the temperature of the drying area is 105-160 ℃, and the single cord tension of the drying area is less than or equal to 3.0 mN/dtex; the temperature of the hot stretching area is 200-230 ℃, and the tension of a single cord of the hot stretching area is 6.0-11.0 mN/dtex; the temperature of the heat setting area is 200-230 ℃, and the tension of a single cord of the heat setting area is 4.5-8.0 mN/dtex.
Preferably, the method for manufacturing the polyamide 56 dipped cord fabric with high residual dry heat shrinkage force is used, wherein the dipping glue solution is resorcinol-formaldehyde-latex.
Preferably, the method for manufacturing the polyamide 56 dipped cord fabric with high residual dry heat shrinkage force is used, wherein the cord strength of the polyamide 56 dipped cord fabric is 6.5-8.0 cN/dtex; the residual dry heat shrinkage force at 2min is more than or equal to 4.0 mN/tex; the breaking elongation of the cord is 22-30%.
A polyamide 56 dipped cord fabric with high residual dry heat shrinkage force produced by the production method.
The invention has the advantages that: the manufacturing method of the polyamide 56 dipped cord fabric with high residual dry heat shrinkage force adopts a dipping process of drying by using extremely low drawing tension, high-power drawing heat treatment and proper retraction heat setting, the dipped cord fabric prepared by the method has high strength which can reach 6.5-8.0cN/dtex, the residual dry heat shrinkage force of 2min after heating for 180-15 min is more than 4.0mN/tex, the elongation at break of cord is 22-30%, and the flat spot phenomenon of tires can be improved or eliminated.
Detailed Description
The present invention will be further described with reference to the following specific examples.
Example 1
A manufacturing method of polyamide 56 dipped cord fabric with high residual dry heat shrinkage force uses 940dtex industrial raw polyamide 56 yarn with high strength to carry out twisting, weaving and dipping, and specifically comprises the following steps:
(1) twisting: twisting the polyamide 56 protofilament by using an ALLMA CC3 model direct twisting machine, and setting by referring to the process parameters in the table 1;
(2) weaving: weaving the twisted threads by using a PICANOL air jet loom, wherein the weaving reeding adopts a reed-line mode, the twisting bobbin creel controls the tension uniformity of the cloth surface by using a wire inserting spindle tension control device to weave white blank cord fabric, and the wire inserting spindle tension control device comprises a tension spring, a brake belt and a drum;
(3) gum dipping: performing single-bath dipping heat treatment on the white blank cord fabric by using RFL (resorcinol-formaldehyde-latex) dipping glue solution, wherein the dipping heat treatment comprises a drying area, a hot stretching area and a heat setting area; setting by referring to the dipping process parameters in the table 1, and obtaining the polyamide 56 dipped cord fabric with high residual dry heat shrinkage force after dipping.
Example 2:
a manufacturing method of polyamide 56 dipped cord fabric with high residual dry heat shrinkage force uses 940dtex industrial raw polyamide 56 yarn with high strength to carry out twisting, weaving and dipping, and specifically comprises the following steps:
(1) twisting: twisting polyamide 56 protofilaments by using an ALLMA CC3 model direct twisting machine, and setting according to the process parameters in the table 1;
(2) weaving: weaving the twisted threads by using a PICANOL air jet loom, wherein the weaving and reeding adopt a reed-one-line mode, a twisted thread bobbin creel controls the tension uniformity of the cloth surface by using a brake tension controller to weave white blank cord fabric, and the brake tension controller comprises a filament inserting bobbin, a tension spring and a felt pad;
(3) gum dipping: performing single-bath dipping heat treatment on the white blank cord fabric by using RFL (resorcinol-formaldehyde-latex) dipping glue solution, wherein the dipping heat treatment comprises a drying area, a hot stretching area and a heat setting area; setting by referring to the dipping process parameters in the table 1, and obtaining the polyamide 56 dipped cord fabric with high residual dry heat shrinkage force after dipping.
Example 3:
a manufacturing method of polyamide 56 dipped cord fabric with high residual dry heat shrinkage force uses 1400dtex industrial raw polyamide 56 yarn with high strength to carry out twisting, weaving and dipping, and specifically comprises the following steps:
(1) twisting: twisting polyamide 56 protofilaments by using an ALLMA CC3 model direct twisting machine, and setting according to the process parameters in the table 1;
(2) weaving: weaving the twisted threads by using a PICANOL air jet loom, wherein the weaving and reeding adopt a reed-one-line mode, a twisting bobbin creel controls the tension uniformity of the cloth surface by using a brake tension controller to weave white blank cord fabric, and the filament inserting spindle tension control device comprises a filament inserting bobbin, a tension spring and a felt pad;
(3) gum dipping: performing single-bath dipping heat treatment on the white blank cord fabric by using RFL (resorcinol-formaldehyde-latex) dipping glue solution, wherein the dipping heat treatment comprises a drying area, a hot stretching area and a heat setting area; setting by referring to the dipping process parameters in the table 1, and obtaining the polyamide 56 dipped cord fabric with high residual dry heat shrinkage force after dipping.
Comparative example 1:
a manufacturing method of polyamide 56 dipped cord fabric with high residual dry heat shrinkage force uses 940dtex industrial raw silk of high-strength polyamide 56 to carry out twisting, weaving and dipping, and comprises the following steps:
(1) twisting: twisting the polyamide 56 protofilament by using an ALLMA CC3 model direct twisting machine, and setting by referring to the process parameters in the table 1;
(2) weaving: weaving the twisted threads by using a PICANOL air jet loom, wherein the weaving reeding adopts a reed-line mode, the twisting bobbin creel controls the tension uniformity of the cloth surface by using a wire inserting spindle tension control device to weave white blank cord fabric, and the wire inserting spindle tension control device comprises a tension spring, a brake belt and a drum;
(3) gum dipping: performing single-bath dipping heat treatment on the white blank cord fabric by using RFL (resorcinol-formaldehyde-latex) dipping glue solution, wherein the dipping heat treatment comprises a drying area, a hot stretching area and a heat setting area; setting the dipping process parameters according to the table 1, and obtaining the polyamide 56 dipped cord fabric after dipping.
Comparative example 2:
a manufacturing method of polyamide 56 dipped cord fabric with high residual dry heat shrinkage force uses 940dtex industrial raw polyamide 56 yarn with high strength to carry out twisting, weaving and dipping, and specifically comprises the following steps:
(1) twisting: twisting polyamide 56 protofilaments by using an ALLMA CC3 model direct twisting machine, and setting according to the process parameters in the table 1;
(2) weaving: weaving the twisted threads by using a PICANOL air jet loom, wherein the weaving and reeding adopt a reed-one-line mode, a twisted thread bobbin creel controls the tension uniformity of the cloth surface by using a brake tension controller to weave white blank cord fabric, and the brake tension controller comprises a filament inserting bobbin, a tension spring and a felt pad;
(3) gum dipping: performing single-bath dipping heat treatment on the white blank cord fabric by using RFL (resorcinol-formaldehyde-latex) dipping glue solution, wherein the dipping heat treatment comprises a drying area, a hot stretching area and a heat setting area; setting the dipping process parameters according to the table 1, and obtaining the polyamide 56 dipped cord fabric after dipping.
Comparative example 3:
a manufacturing method of polyamide 56 dipped cord fabric with high residual dry heat shrinkage force uses 1400dtex industrial raw polyamide 56 yarn with high strength to carry out twisting, weaving and dipping, and specifically comprises the following steps:
(1) twisting: twisting polyamide 56 protofilaments by using an ALLMA CC3 model direct twisting machine, and setting according to the process parameters in the table 1;
(2) weaving: weaving the twisted threads by using a PICANOL air jet loom, wherein the weaving and reeding adopt a reed-one-line mode, a twisting bobbin creel controls the tension uniformity of the cloth surface by using a brake tension controller to weave white blank cord fabric, and the filament inserting spindle tension control device comprises a filament inserting bobbin, a tension spring and a felt pad;
(3) gum dipping: performing single-bath dipping heat treatment on the white blank cord fabric by using RFL (resorcinol-formaldehyde-latex) dipping glue solution, wherein the dipping heat treatment comprises a drying area, a hot stretching area and a heat setting area; setting the dipping process parameters according to the table 1, and obtaining the polyamide 56 dipped cord fabric after dipping.
Comparative example 4:
a manufacturing method of polyamide 66 dipped cord fabric uses 940dtex industrial precursor of high-strength polyamide 66 (chinlon 66) to carry out twisting, weaving and dipping, and specifically comprises the following steps:
1) twisting, namely twisting the nylon 66 protofilament by using an ALLMA CC3 model direct twisting machine, and setting according to the process parameters in the table 1;
2) weaving, namely weaving the twisted threads by using a PICANOL air jet loom, wherein the weaving and reeding adopt a reed-one-line mode, and the twisting bobbin creel controls the tension uniformity of the cloth surface by using a wire inserting spindle tension control device to weave white blank cord fabric. The tension control of the wire inserting spindle comprises a wire inserting bobbin, a tension spring and a felt gasket;
3) dipping, using RFL (resorcinol-formaldehyde-latex) dipping glue solution to carry out single-bath dipping heat treatment on the white blank cord fabric, wherein the dipping heat treatment comprises a drying area, a hot stretching area and a heat setting area; setting the dipping technological parameters according to the table 1, and obtaining the polyamide 66 dipped cord fabric after dipping.
Comparative example 5:
a manufacturing method of polyamide 66 dipped cord fabric uses 1400dtex industrial raw filament of high-strength polyamide 66 (chinlon 66) to carry out twisting, weaving and dipping, and specifically comprises the following steps:
the specific production process comprises the following steps:
1) twisting, namely twisting the nylon 66 protofilament by using an ALLMA CC3 model direct twisting machine, and setting according to the process parameters in the table 1;
2) weaving, namely weaving the twisted threads by using a PICANOL air jet loom, wherein the weaving and reeding adopt a reed-one-line mode, a twisting bobbin creel controls the tension uniformity of the cloth surface by using a brake tension controller to weave white blank cord fabric, and the wire inserting spindle tension control device comprises a wire inserting bobbin, a tension spring and a felt gasket;
3) dipping, using RFL (resorcinol-formaldehyde-latex) dipping glue solution to carry out single-bath dipping heat treatment on the white blank cord fabric, wherein the dipping heat treatment comprises a drying area, a hot stretching area and a heat setting area; setting the dipping technological parameters according to the table 1, and obtaining the polyamide 66 dipped cord fabric after dipping.
And (3) performance testing: the dipped fabrics manufactured in examples 1 to 3 and comparative examples 1 to 5 were tested according to the following test methods:
1. the fiber density test method comprises the following steps: measured according to the method of GB/T14343.
2. The method for testing the strength, strength and elongation at break of the cord thread comprises the following steps: the determination was carried out according to FZT 54013, GB/T9101. Cord strength is the ratio of cord strength to the true linear density of the cord.
3. Dry heat shrinkage force test method: the heat treatment temperature (180 + -1) ° c, heat treatment time 15 minutes later, the heat source was removed while continuing to maintain the test cord shrinkage force for 2 minutes, resulting in a dry heat shrinkage force of 15 minutes and a residual dry heat shrinkage force of 2 minutes, as determined by the ASTM-D5591 method.
4. Twist testing method: reference is made to the GB/T14345 method.
The process parameters are shown in Table 1:
TABLE 1 Process parameters of a method for manufacturing a polyamide 56 dipped cord fabric with high residual dry heat shrinkage
Examples 1-2, comparative examples 1-2 and comparative example 4, the product properties obtained are as follows:
TABLE 2 product indexes of polyamide 56 dipped cord fabric and nylon 66 cord fabric with high residual dry heat shrinkage
Example 3, comparative example 3 and comparative example 5, the product properties obtained are as follows in table 3:
TABLE 3 product indexes of polyamide 56 dipped cord fabric and nylon 66 cord fabric with high residual dry heat shrinkage
The manufacturing method of the polyamide 56 dipped cord fabric with high residual dry heat shrinkage force adopts a dipping process of drying by using extremely low drawing tension, high-power drawing heat treatment and proper retraction heat setting, the dipped cord fabric prepared by the method has high strength which can reach 6.5-8.0cN/dtex, the residual dry heat shrinkage force of 2min after heating for 180-15 min is more than 4.0mN/tex, the elongation at break of the cord is 22-30%, and the flat spot phenomenon of a tire can be improved or eliminated.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. A manufacturing method of polyamide 56 dipped cord fabric with high residual dry heat shrinkage force is characterized by comprising the following steps:
(1) twisting: twisting the polyamide 56 fiber on a straight twisting machine to prepare a twisted wire;
(2) weaving: weaving the twisted threads by a weaving machine, and controlling the uniformity of the cloth surface by a filament inserting spindle tension control device to prepare white blank cord fabric;
(3) gum dipping: and (3) carrying out gum dipping and heat treatment on the white blank cord fabric for 2-10 min by using gum dipping glue solution to obtain the polyamide 56 gum dipping cord fabric with high residual dry heat shrinkage force.
2. The method for producing a polyamide 56 dipped cord fabric with high residual dry heat shrinkage as claimed in claim 1, wherein the polyamide 56 fiber in the step (1) is an industrial high tenacity fiber, and the fiber strength is 8.0 to 9.0 cN/dtex.
3. The method for manufacturing the polyamide 56 dipped cord fabric with high residual dry heat shrinkage as claimed in claim 1, wherein the twist degree of the twisted yarn in the step (1) is 330-.
4. The method for manufacturing the high residual dry heat shrinkable polyamide 56 dipped cord fabric as claimed in claim 1, wherein said step (2) is carried out by a reeding method of a reed wire, and the yarn twisting bobbin creel controls the uniformity of the cloth surface tension by a yarn inserting spindle tension control device, said yarn inserting spindle tension control device comprises a yarn inserting bobbin, a tension spring and a felt gasket.
5. The method for manufacturing the high residual dry heat shrinkable polyamide 56 dipped cord fabric as claimed in claim 1, wherein said step (3) of the white blank cord fabric is sequentially passed through a dipping tank, a drying zone, a hot stretching zone and a heat setting zone.
6. The method for manufacturing the polyamide 56 dipped cord fabric with high residual dry heat shrinkage force as claimed in claim 1, wherein the white blank cord fabric of the step (3) sequentially passes through a drying zone, a dipping tank, a drying zone, a hot stretching zone and a heat setting zone.
7. The method for manufacturing the high residual dry heat shrinkable polyamide 56 dipped cord fabric as claimed in claim 5 or 6, wherein the temperature of said drying zone is 105 ℃ and 160 ℃, and the single cord tension of said drying zone is less than or equal to 3.0 mN/dtex; the temperature of the hot stretching area is 200-230 ℃, and the tension of a single cord of the hot stretching area is 6.0-11.0 mN/dtex; the temperature of the heat setting area is 200-230 ℃, and the tension of a single cord of the heat setting area is 4.5-8.0 mN/dtex.
8. The method of claim 1, wherein the dip is resorcinol-formaldehyde-latex.
9. The method for producing a polyamide 56 dipped cord fabric with high residual dry heat shrinkage as claimed in claim 1, wherein the cord strength of the polyamide 56 dipped cord fabric is 6.5 to 8.0 cN/dtex; the residual dry heat shrinkage force at 2min is more than or equal to 4.0 mN/tex; the breaking elongation of the cord is 22-30%.
10. A polyamide 56 dipped cord fabric having a high residual dry heat shrinkage force produced by the production method according to any one of claims 1 to 9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113668076A (en) * | 2021-08-13 | 2021-11-19 | 亚东工业（苏州）有限公司 | Method for manufacturing cord fabric by utilizing bio-based chinlon 56 |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112647310B (en) | 2022-09-27 |
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