CN103388184B - Spinning Process of Low Melting Point Polymer - Google Patents

Abstract

The invention provides a spinning process of a low-melting-point polymer, which comprises the following process flows of: s1: drying the polymer to ensure that the humidity is 1-20% and the temperature is 40-50 ℃; s2: adopting a melt spinning machine, melting for 5-10 minutes at the melting temperature of 200-300 ℃, converting the polymer into fluid, extruding the fluid by a screw, and spraying silk threads through a spinning nozzle, wherein the silk threads need to be cooled by an air duct of an industrial air conditioner to be reduced to-20 ℃; s3: leading the cooled silk thread into a silk dividing roller for stretching, then leading the silk thread into a cold roller, and stretching the silk thread 2-10 times through the silk dividing roller, wherein the stretching temperature is 20-40 ℃; s4: the winding head with the winding speed of 1000m/min-5000m/min is adopted during the yarn winding, and the temperature of the cold roll is 10-20 ℃ during the yarn winding. The spinning process of the low-melting-point polymer provided by the invention has simple and practical process flow, and can be used for spinning the polymer with the melting point of 50-70 ℃ into industrial-grade silk threads.

Description

Spinning Process of Low Melting Point Polymer

technical field

The invention relates to a spinning process, in particular to a low-melting point polymer spinning process.

Background technique

The existing low-melting point polymer spinning process usually uses polyester (PET), polyamide (PA), polyethylene (PE), propylene (PP) and the like as raw materials.

For polymers with a melting point of 50°C-70°C, due to their low melting point and low-temperature crystallization characteristics, the requirements for polymer spinning process control are relatively high. Especially for this low-melting thermoplastic polymer of polycaprolactone (PCL), its water absorption is very strong, and its fusing point is only 60 ℃-63 ℃, and the spinning process using it as raw material has not been reported yet.

Contents of the invention

The technical problem to be solved by the present invention is to provide a spinning process for low-melting polymers.

The present invention also provides a low-melting-point polymer spinning process, using polymer raw materials with a melting point of 50°C-70°C, through spinning equipment, to spin polymer filaments with a melting point of 50°C-70°C, which The process flow is as follows:

S1: Dry the polymer in vacuum, the humidity of the dried polymer is 1%-20%, and the temperature is 40°C-50°C; S2: Use a melt spinning machine, pour the dried polymer into the barrel, and use the melting temperature The temperature is 200℃-300℃, melting for 5-10 minutes, at this time, the polymer becomes fluid, extruded by the screw, and the silk is sprayed out through the spinneret, and the silk needs to be cooled by the air duct of the industrial air conditioner to reduce the temperature of the silk to - 20°C-20°C; S3: Lead the cooled thread to the splitting roller for stretching, and then lead it to the cooling roll, the thread can be stretched 2-10 times through the splitting roller, and the temperature during stretching is 20°C-40°C; S4: An industrial winding head is used for winding, the winding speed of the winding head is 1000m/min-5000m/min, and the temperature of the cold roll is 10°C-20°C during winding.

Further, the melting temperature is 200° C. for 5 minutes, the temperature during stretching is 20° C., and the temperature of the cooling roll is 10° C. during drawing.

Further, the melting temperature is 300° C. for 10 minutes, the temperature during stretching is 40° C., and the temperature of the cooling roll is 20° C. during drawing.

Further, the melting temperature is 250°C for 8 minutes, the stretching temperature is 30°C, and the cooling roll temperature is 15°C when drawing.

Further, the polymer is polycaprolactone.

Further, 100 parts of polycaprolactone, 0.1-1 part of toughening agent and 0.1-1 part of aging agent are uniformly mixed as raw materials for the spinning process.

By adopting the spinning process of the low-melting polymer provided by the invention, the technological process is simple and practical, and the polymer having a melting point of 50°C-70°C can be spun into industrial-grade silk.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

Fig. 1 schematically shows the spinning equipment given in the embodiment example of the present invention.

detailed description

The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

Example 1

In this embodiment, a kind of spinning equipment is provided, including a melt spinning machine 1, a spinneret 2, an industrial air conditioner and its air duct 3, a splitting device 4 and a spinning device 7, and the splitting device 4 is provided with a splitting The roll 5 and the cold roll 6 are provided with a winding head 8 on the wire-receiving device 7 . The material becomes a fluid after being melted by the melt spinning machine 1, extruded by the screw, and the silk thread is sprayed out through the spinneret 2, and the thread enters the air duct 3, and the air duct 3 is refrigerated by the industrial air conditioner, and the temperature is 0°C-15°C; The material comes out from the air channel 3, passes through the splitting roller 5 and the cooling roller 6, and reaches the winding head 8 for winding.

This embodiment also provides a low-melting point polymer spinning process, using polymer raw materials with a melting point of 50°C-70°C, through the above spinning equipment, to spin polymer filaments with a melting point of 50°C-70°C , its technological process is as follows:

S1: Dry the polymer in vacuum. After drying, the humidity of the polymer is 1%-20%, and the temperature is 40°C-50°C. The time depends on the performance of the dryer. In this way, the dried polymer can reach the spinning grade. ;

S2: Using melt spinning machine 1, pour the dried polymer into the material barrel, adopt a melting temperature of 200°C, and melt for 5 minutes. At this time, the polymer becomes fluid, extruded through the screw, and sprayed through the spinneret 2 Out of the silk thread, adjust the metering pump to control the thickness of the thread; the silk thread needs to be cooled by the air duct 3 of the industrial air conditioner to reduce the temperature of the thread to -20°C-20°C;

S3: Lead the cooled silk thread to the splitting roller 5 for stretching, and then lead it to the cooling roller 6. The thread can be stretched 2-10 times through the splitting roller 5, which can increase the strength and toughness of the thread. 20°C, oiling is required during the stretching process;

S4: Industrial winding head 8 is used for winding. The speed of winding head 8 must be consistent with the speed of splitting roller 5 and cooling roller 6. The winding speed is 1000m/min-5000m/min to avoid The temperature of the cold roll 6 is 10°C when the wire is cut, and the finished product is stored at 0°C-50°C after the wire is collected.

Example 2

In the embodiment of the present invention, a low-melting-point polymer spinning process is provided, using polymer raw materials with a melting point of 50°C-70°C, through the above-mentioned spinning equipment, to spin polymer filaments with a melting point of 50°C-70°C , its technological process is as follows:

S1: Dry the polymer in vacuum. After drying, the humidity of the polymer is 1%-20%, and the temperature is 40°C-50°C. The time depends on the performance of the dryer. In this way, the dried polymer can reach the spinning grade. ;

S2: Using melt spinning machine 1, pour the dried polymer into the material barrel, adopt a melting temperature of 300°C, and melt for 10 minutes. At this time, the polymer becomes fluid, extruded through the screw, and sprayed through the spinneret 2 Out of the silk thread, adjust the metering pump to control the thickness of the thread; the thread needs to be cooled by the air duct 3 of the industrial air conditioner, so that the temperature of the thread will drop to -20°C-20°C;

S3: Lead the cooled silk thread to the splitting roller 5 for stretching, and then lead it to the cooling roller 6. The thread can be stretched 2-10 times through the splitting roller 5, which can increase the strength and toughness of the thread. 40°C, oiling is required during the stretching process;

S4: Industrial winding head 8 is used for winding. The speed of winding head 8 must be consistent with the speed of splitting roller 5 and cooling roller 6. The winding speed is 1000m/min-5000m/min to avoid The temperature of the cold roll 6 is 20°C when the wire is cut, and the finished product is stored at 0°C-50°C after the wire is collected.

Example 3

In the embodiment of the present invention, a low-melting-point polymer spinning process is provided, using polymer raw materials with a melting point of 50°C-70°C, through the above-mentioned spinning equipment, to spin polymer filaments with a melting point of 50°C-70°C , its technological process is as follows:

S1: Dry the polymer in vacuum. After drying, the humidity of the polymer is 1%-20%, and the temperature is 40°C-50°C. The time depends on the performance of the dryer. In this way, the dried polymer can reach the spinning grade. ;

S2: Using melt spinning machine 1, pour the dried polymer into the material barrel, adopt a melting temperature of 250°C, and melt for 8 minutes. At this time, the polymer becomes fluid, extruded through the screw, and sprayed through the spinneret 2 Out of the silk thread, adjust the metering pump to control the thickness of the thread; the silk thread needs to be cooled by the air duct 3 of the industrial air conditioner to reduce the temperature of the thread to -20°C-20°C;

S3: Lead the cooled silk thread to the splitting roller 5 for stretching, and then lead it to the cooling roller 6. The thread can be stretched 2-10 times through the splitting roller 5, which can increase the strength and toughness of the thread. 30°C, oiling is required during the stretching process;

S4: Industrial winding head 8 is used for winding. The speed of winding head 8 must be consistent with the speed of splitting roller 5 and cooling roller 6. The winding speed is 1000m/min-5000m/min to avoid The temperature of the cold roll 6 is 15°C when the wire is cut, and the finished product is stored under the condition of 0°C-50°C after the wire is collected.

Example 4

In this embodiment, a spinning process of a low-melting polymer is provided, using polycaprolactone with a melting point of 60°C-63°C as a raw material, and spinning a polymer with a melting point of 60°C-63°C through the above-mentioned spinning equipment filament.

Compared with Example 1, polycaprolactone as a raw material has stronger water absorption, so 100 parts of polycaprolactone raw materials are used to mix evenly with 0.1-1 part of toughening agent and 0.1-1 part of aging agent, so that Polycaprolactone modified.

It can be seen from the above description that the spinning process of the low-melting point polymer provided by the present invention achieves the following technical effects: the process flow is simple and practical, and the polymer with a melting point of 50°C-70°C can be spun into industrial-grade silk.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (6)

1. a spinning technique for low melting point polymer, is characterized in that, with the polymer raw material of fusing point 50 DEG C-70 DEG C, by spinning equipment, spin out the polymer filaments that fusing point is 50 DEG C-70 DEG C, its technological process is as follows:

S1: by polymer vacuumize, the humidity of dry post-consumer polymer is 1%-20%, temperature 40 DEG C-50 DEG C; S2: adopt melt spinning machine, pour dried polymer into charging basket, melt temperature is adopted to be 200 DEG C-300 DEG C, melting 5-10 minute, now polymer fluidify, through Screw Extrusion, crosses spinning head ejection silk thread, silk thread need cool through the air channel of industrial air-conditioning, makes silk thread temperature reduce to-20 DEG C-20 DEG C; S3: cooled silk thread is imported point roll dies and stretches, then import cold roller, can by draw wire 2-10 doubly through point roll dies, and during stretching, temperature is 20 DEG C-40 DEG C; S4: the winding head adopting industry when receiving silk, the winding speed of winding head is 1000m/min-5000m/min, and the temperature receiving cold roller during silk is 10 DEG C-20 DEG C.

2. the spinning technique of low melting point polymer as claimed in claim 1, it is characterized in that, described melt temperature is 200 DEG C, melting 5 minutes, and during described stretching, temperature is 20 DEG C, and the temperature receiving described cold roller during silk is 10 DEG C.

3. the spinning technique of low melting point polymer as claimed in claim 1, it is characterized in that, described melt temperature is 300 DEG C, melting 10 minutes, and during described stretching, temperature is 40 DEG C, and the temperature receiving described cold roller during silk is 20 DEG C.

4. the spinning technique of low melting point polymer as claimed in claim 1, it is characterized in that, described melt temperature is 250 DEG C, melting 8 minutes, and during described stretching, temperature is 30 DEG C, and the temperature receiving described cold roller during silk is 15 DEG C.

5. the spinning technique of the low melting point polymer as described in claim 1 or 4, is characterized in that, described polymer is polycaprolactone.

6. the spinning technique of low melting point polymer as claimed in claim 5, it is characterized in that, described spinning technique raw material adopts 100 parts of polycaprolactones to mix with the flexibilizer of 0.1 part-1 part and 0.1 part-1 part aging dose.