CN112391685B

CN112391685B - Molten resin defoaming method and spinning forming method

Info

Publication number: CN112391685B
Application number: CN201910738499.9A
Authority: CN
Inventors: 马永梅; 向前; 张京楠; 叶钢; 郑鲲; 曹新宇
Original assignee: Institute of Chemistry CAS
Current assignee: Institute of Chemistry CAS
Priority date: 2019-08-12
Filing date: 2019-08-12
Publication date: 2023-03-21
Anticipated expiration: 2039-08-12
Also published as: CN112391685A

Abstract

The invention discloses a molten resin defoaming method and a spinning forming method, wherein the defoaming method comprises the following steps: s1, feeding; s2, performing spinning treatment on the molten resin in a vacuum environment; and S3, defoaming the resin after spinning in a vacuum environment. The invention provides a method for defoaming molten resin, wherein the molten resin is sprayed into filaments through a spinning process, the specific surface area of the resin filaments is increased, bubbles are easy to escape from the surface or the interior of the resin filaments, and the defoaming effect is remarkable. The invention also provides a spinning forming method, and the defoamed resin is spun, so that the bubbles in the resin yarn are obviously reduced, and the quality of the resin yarn is obviously improved.

Description

Molten resin defoaming method and spinning forming method

Technical Field

The invention belongs to the field of resin spinning, and particularly relates to a molten resin defoaming method and a spinning forming method.

Background

The resin may be classified into a thermoplastic resin and a thermosetting resin. In the process of producing resin fibers, one of the most fundamental factors determining the quality of raw resin filaments depends on the deaeration effect of the spinning solution. The quality of the defoaming effect directly determines whether the later spinning process can be smoothly carried out. The spinning solution can have bubbles in the polymerization or conveying process, larger bubbles can cause the interruption, deformation, broken ends and the like of the spinning solution through the spinneret holes, smaller bubbles can remain in fibers through the spinneret holes to cause the fibers to have holes, and the fibers are easy to break to form broken filaments and broken filaments during drafting. When the deaeration is insufficient, the strength cannot be achieved, and the strength of the finished yarn is finally affected. Therefore, the air bubbles in the spinning solution must be removed completely before spinning. However, the spinning solution has high viscosity, and the bubbles are difficult to remove.

At present, thermosetting resin is in a liquid state before curing, the viscosity of the resin is relatively low, and defoaming treatment in spinning is mainly carried out by adopting a vacuum defoaming method or a vacuum stirring method.

The thermoplastic resin has the properties of softening by heating and hardening by cooling in a certain temperature range, does not generate chemical reaction, and can maintain the properties no matter how many times the heating and cooling are repeatedly carried out. The thermoplastic resin is: polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), polyamide (PA), polyoxymethylene (POM), polycarbonate (PC), thermoplastic Polyimide (TPI), polyphenylene oxide, polysulfone, rubber, and the like. The thermoplastic resin is simple in processing and forming, has good mechanical properties, and is a raw material very suitable for 3D printing.

The thermoplastic resin is heated to a temperature higher than the melting temperature to become molten resin, and the molten resin has high creep resistance due to high viscosity, for example, the thermal expansion coefficient of the thermoplastic polyimide resin is only 50 PPM/DEG C, so that the thermoplastic polyimide resin has high viscosity and good creep resistance, bubbles generated in the production and feeding processes of the resin are difficult to eliminate, and a common defoaming method of the thermoplastic resin, such as a vacuum or vacuum-stirring method, is adopted, and due to the ultrahigh viscosity of the thermoplastic resin, the binding force on the bubbles is strong, the bubble migration speed is slow, and the efficiency of removing the bubbles in the molten resin by the vacuum or vacuum-stirring method is very low. For example, the film defoaming technique is a method for forcibly coating a resin solution into a film by using a scraper or a louver by using the principle of a film evaporator so as to greatly increase the contact area between the resin and the vacuum and improve the evaporation effect, and is generally used for continuously defoaming high-viscosity resins at present. However, this method is not suitable for the molten resin, and the blade or the flap is difficult to coat the molten resin in a film form due to the high creep resistance of the molten resin, and the blade or the flap is easily stuck and agglomerated by the molten resin due to the high viscosity of the molten resin.

The present invention has been made in view of this point.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a molten resin defoaming method capable of effectively removing bubbles.

Another object of the present invention is to provide a method for melt resin spinning molding.

In order to solve the technical problems, the invention adopts the technical scheme that: a method for defoaming molten resin comprises the following steps:

s1, feeding;

s2, performing spinning treatment on the molten resin in a vacuum environment;

and S3, defoaming the resin subjected to spinning in a vacuum environment.

Further, vacuum treatment is performed after feeding. The molten resin is fed and then subjected to a spinning treatment, and since the molten resin is in a vacuum environment after the spinning treatment, the temperature of the resin is lowered and the viscosity of the resin is high, the molten resin is spun into resin filaments. The resin filament is always in a vacuum environment, the specific surface area of the resin sprayed into the filament state is remarkably increased, the air bubbles exist on the surface or in the resin filament, the air bubbles are easily escaped from the surface or in the resin filament under the influence of the pressure difference between the inside and the outside of the resin during the period, and the vacuum defoaming effect is remarkable.

Further, in the step S2, the molten resin is ejected by a spinning method into a plurality of resin filaments.

Further, in the step S1, the resin is fed by driving the resin by means of an extruder; due to the fact that the resin is high in viscosity and good in creep resistance, resin feeding can be accelerated by means of an extruder.

Preferably, in the step S1, the resin is fed by driving the resin with a screw extruder.

Further, in the step S1, during the feeding, the resin is maintained or heated to a molten state by heating. Through heating the resin in the feeding process, the molten state of the resin can be kept through extrusion of the heating screw rod, preliminary deaeration is carried out, and the spinning treatment is facilitated.

A molten resin spinning forming method adopting any one of the above molten resin defoaming methods comprises a step S4 of spinning the resin defoamed by the defoaming method, cooling and shaping.

Further, in the step S4, the defoamed resin is extruded by a pushing method, and is spun into a resin filament by a single-hole or multi-hole spinning method. The spinning forming method extrudes the resin defoamed by the method into filaments or into bars, so that the bubbles in the filaments or the bars are obviously reduced, and the quality of finished products is obviously improved.

Further, the method also comprises a step S5 of winding the spinning. In the winding process, along with the winding resin yarns are more and more, the outer diameter of the winding coil is gradually increased, the winding linear speed is increased, the spinning speed is unchanged, and the resin yarns are easily tensioned and broken. The method can adopt a soft drive winding method, the maximum linear speed of the winding wire of the soft drive winding is less than the yarn outlet speed of the spinning, when the winding linear speed is increased, the winding linear speed of the soft drive winding is reduced, and the phenomenon that the resin yarn outlet is stretched and broken is avoided.

Further, in step S5, before the spinning is wound up, the spinning is subjected to online quality detection. The step S5 can be adopted to judge whether a large amount of bubbles in the filament affect the quality of the filament and judge the uniformity of the filament diameter.

Further, the spinning formation is performed in a vacuum environment.

After the technical scheme is adopted, compared with the prior art, the invention has the following beneficial effects.

The invention provides a method for defoaming molten resin, wherein the molten resin is jetted out to form filaments through a spinning process, the resin filaments are always in a vacuum environment, the specific surface area of the resin jetted to form the filaments is remarkably increased, the bubbles exist on the surface or in the resin filaments, and the bubbles are easily escaped from the surface or in the resin filaments under the influence of vacuum negative pressure during the period, so that the defoaming effect is remarkable. The invention also provides a spinning forming method, the resin is subjected to spinning treatment after defoaming treatment, the bubbles in the resin yarn are obviously reduced, and the quality of the resin yarn is obviously improved. Spinning forming is carried out in a vacuum environment, the oxygen and moisture content in the vacuum environment is greatly reduced, the resin is greatly prevented from undergoing degradation reaction, and the resin yarn is more stable in performance and better in quality.

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:

FIG. 1 is a schematic perspective view of a defoaming device and a spinning forming device according to the present invention;

FIG. 2 is a schematic view showing the structure of the deaeration device and the spinning forming device according to the present invention with the exterior separated from the interior;

FIG. 3 is a schematic view of the invention from another perspective of FIG. 2;

FIG. 4 is a schematic diagram of the feed module and spin module configurations of the present invention;

FIG. 5 is a schematic view of the spinning module of FIG. 4 from another perspective in accordance with the present invention;

fig. 6 is a schematic structural diagram of a heating cylinder and a second spinneret plate in the spinning forming device of the present invention.

In the figure: 1. a feeding module 11, a feeding hole 12 and a first extruder; 2. a spinneret module 21, a first spinneret plate 22 and spinneret holes; 3. a defoaming module; 4. a vacuum chamber 41, a feeding window 42, an observation port 43, a material taking port 44, a vacuum insertion port 45 and a vacuum pumping port; 5. a spinning module 51, a second extruder 52, a heating cylinder 53 and a second spinneret plate; 6. the soft transmission winding module 61, the magnetic drive operating lever 62 and the soft transmission winding machine; 7. quality detection module, 71, optical microscope.

It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 to 3, the molten resin defoaming method and the spin molding method according to the present invention can be realized by the defoaming device and the spin molding according to the present invention, and the spin molding device includes a molten resin defoaming device. The defoaming device comprises a feeding module 1, a spinning module 2, a defoaming module 3 and a vacuum chamber 4. The spinning forming device comprises the defoaming device and at least a spinning module 5.

The defoaming method and the spinning forming method are suitable for thermoplastic resins which have high melting point, high viscosity and good creep resistance, and are particularly suitable for thermoplastic resins with ultrahigh viscosity and higher creep resistance, such as polyimide and the like.

Example one

The embodiment provides a method for defoaming molten resin, which comprises the following steps:

s1, feeding;

s2, performing spinning treatment on the molten resin in a vacuum environment;

and S3, defoaming the resin after spinning in a vacuum environment.

Further, vacuum treatment is performed after feeding. The molten resin is then subjected to a spinning process, and since the molten resin is in a vacuum room temperature environment after the spinning process, the molten resin is spun into resin filaments due to the decrease in resin temperature and the high viscosity of the resin. The resin filament is always in a vacuum environment, the specific surface area of the resin sprayed into the filament state is remarkably increased, the air bubbles exist on the surface or in the resin filament, the air bubbles are easily escaped from the surface or in the resin filament under the influence of the pressure difference between the inside and the outside of the resin during the period, and the vacuum defoaming effect is remarkable.

In the step S1, the feeding process is performed in a vacuum environment. In the step S2, the molten resin is ejected by a spinning method into a plurality of resin filaments. The molten resin is treated by a spinning method, and the molten resin can be sprayed into a plurality of resin filaments by a spinneret plate. In the step S1, the resin is driven by adopting an extruder to feed, and due to the fact that the resin is high in viscosity and good in creep resistance, the resin can be fed quickly by adopting the extruder. Preferably, in the step S1, the resin is heated and fed by using a heating screw extruder.

In the step S1, the resin is maintained or heated to a molten state by heating during the feeding. By heating the resin in the feeding process, the thermoplastic resin in a molten state can be added in the feeding process, and the molten state of the resin can be kept by heating, so that the spinning treatment is facilitated; it is also possible to add the thermoplastic resin in a solid state at the time of feeding, and the solid resin is heated to a molten state. For example, when a thermoplastic polyimide resin in a solid state is fed, the temperature of the heated screw extruder may be set to 350 to 380 ℃ to heat and melt the resin. And feeding and spinning by an extruder in the feeding process.

A molten resin spinning forming method adopting any one of the above molten resin defoaming methods comprises a step S4 of spinning the resin defoamed by the defoaming method, cooling and shaping. In the step S4, the defoamed resin is heated to a molten state, and the resin is extruded in a pushing manner and spun into resin filaments in a single-hole or multi-hole spinning manner. The filament diameter of the resin can be adjusted. The spinning forming method extrudes the resin defoamed by the method into filaments or into bars, so that the bubbles in the filaments or the bars are obviously reduced, and the quality of finished products is obviously improved.

Further, the method also comprises a step S5 of winding the spinning. In the step S5, winding may be performed by a soft transmission winding method. In the rolling process, along with rolling resin silk is more and more, the external diameter of rolling line ball also crescent, the linear velocity grow of rolling, and the play silk speed this moment can not accelerate, will go out the silk and tighten the fracture easily. The method can adopt a soft drive winding method, the maximum linear speed of the winding wire of the soft drive winding is smaller than the yarn outlet speed of the spinning, when the linear speed of the winding becomes large, the linear speed of the winding is reduced by the soft drive winding in a friction slipping mode, and the phenomenon that the resin yarn outlet is broken by stretching is avoided.

Further, in step S5, before the spinning is wound up, the spinning is subjected to online quality detection. In the step S5, the optical microscope is adopted to record the video of the output silk in real time, the optical microscope can be used to grasp the output silk in real time by controlling the measuring software, the computer automatically measures the diameter of the output silk, and the quality of the output silk can be judged whether a large number of bubbles influence the quality of the output silk by comparing the diameter and the size of the output silk.

The method for spinning and molding the molten resin, which is described in any one of the above, is carried out in a vacuum environment. When the molten resin is spun, the heating temperature for heating the resin to a molten state is high, and the resin is easily subjected to degradation reaction with oxygen and moisture in the air at a high temperature during spinning, so that the performance of the resin is reduced. Therefore, the spinning forming is carried out in a vacuum environment, the oxygen and moisture content in the vacuum environment is greatly reduced, the resin is greatly prevented from undergoing a degradation reaction, and the resin yarn has more stable performance and better quality.

Example two

As shown in fig. 1 to fig. 3, the embodiment provides a defoaming device, which includes a feeding module 1 and a spinning module 2 connected to the feeding module 1; the defoaming module 3 is used for defoaming resin, and the defoaming module 3 is arranged below the spinning module 2; and the vacuum chamber 4 is internally provided with the spinning module 2 and the defoaming module 3. The vacuum chamber 4 in this embodiment is connected to a vacuum pump (not shown) through a vacuum port 45 to draw air in the vacuum chamber 4, thereby creating a vacuum atmosphere.

Further, the feeding module 1 is arranged outside the vacuum chamber 4, the feeding module 1 is connected with the spinning module 2, after molten resin is fed, the first extruder 12 and the molten resin form a closed space, a vacuum pump is started to pump vacuum, and the spinning module 2 and the defoaming module 3 can obtain a vacuum environment.

The deaeration module 3 includes a hollow chamber, the deaeration module 3 set up in spout a module 2 below, molten resin through spout a module 2 and be erupted under the effect of feed module 1 or vacuum pressure differential, because molten resin is in room temperature ambient temperature after spouting from spout a module 2 and reduce and resin viscosity is high, resin temperature reduces slightly, therefore molten resin is spouted into the resin filament, falls in the hollow chamber. The resin filament is sprayed into the hollow cavity from the beginning and is always in a vacuum environment, the specific surface area of the resin sprayed into the filament state is remarkably increased, the air bubbles exist on the surface or in the resin filament, the air bubbles are easily escaped from the surface or in the resin filament under the influence of negative pressure in the vacuum cavity in the period, and the defoaming effect is remarkable.

Further, the feed module 1 is arranged within the vacuum chamber 4. The vacuum chamber 4 comprises a feeding window 41 and an observation port 42, the feeding window 41 is matched and sealed with the vacuum chamber 4, and the observation port 42 is used for observing the defoaming condition of the resin; preferably, the material feeding window 41 is arranged at a position where the vacuum chamber 4 is adjacent to the feeding module 1, the material feeding window 41 is opened during material feeding, the material feeding window 41 is sealed with the vacuum chamber 4, and then a vacuum pump is opened to vacuumize through the vacuumizing port 45. The observation port 42 may be provided at a position where the vacuum chamber 4 and the defoaming module 3 are adjacent to each other.

By arranging the observation port 42 on the vacuum chamber 4, the vacuum chamber 4 can be arranged at a position adjacent to the feeding module 1 or the spinning module 2 as required, so that the condition in the defoaming process can be conveniently observed.

As shown in fig. 4, the feeding module 1 comprises a feeding port 11 and a first extruder 12, wherein the feeding port 11 is arranged at one end of the first extruder 12, the feeding port 11 is communicated with the first extruder 12, and the other end of the first extruder 12 is connected with the spinning module 2; preferably, the first extruder 12 is a pipeline, and the inner diameter of the first extruder 12 close to the spinning module 2 is not more than the inner diameter of the first extruder 12 close to the feed port 11. The material enters the first extruder 12 from the feed inlet 11, and the molten resin is conveyed to the spinning module 2, the spinning module 2 is in the vacuum chamber 4, and the molten resin can be sucked into the spinning module 2 through the action of the first extruder 12.

Preferably, the first extruder 12 is a screw heating extruder, the material enters a screw rod gap of the screw heating extruder from the feed port 11, and the molten resin is conveyed to the spinning module 2 by virtue of a shearing force generated by the screw rod in a spiral motion. By arranging the screw heating extruder, the shearing force generated by the screw heating extruder in the spiral motion can provide larger force for the molten resin to pass through the spinning module 2, so that the molten resin can more easily pass through the spinning module 2 to form resin filaments.

Further, the spinning module 2 includes a first spinning plate 21, at least one spinning hole 22 is formed in the first spinning plate 21, and the first spinning plate 21 is connected to the first extruder 12.

The diameter of the spinneret orifice 22 can be 0.1-5mm. The molten resin is jetted into the filament through the spinneret orifice 22 in the vacuum chamber 4, the air bubbles in the filament are sucked out through the pressure difference between the inside and the outside of the filament, the air bubbles in the resin are obviously reduced, and the defoaming effect is remarkable.

The defoaming module 3 comprises a funnel-shaped hollow chamber, one side of the funnel opening of the hollow chamber is opposite to the spinning module 2 and is used for containing the spinning yarns generated by the spinning module 2.

EXAMPLE III

As shown in fig. 1 to 6, the present embodiment provides a spin forming apparatus, which includes the defoaming device of the second embodiment, and further includes a spinning module 5 for spin forming the resin after being defoamed by the defoaming device.

Further, the spinning module 5 comprises a heating cylinder 52 arranged below the defoaming module 3, and one end of the heating cylinder 52 is connected with the defoaming module 3; the second extruder 51 is arranged above the defoaming module 3, is matched with the hollow cavity of the defoaming module 3, and reciprocates in the heating cylinder 52 along the axial direction of the second extruder 51; and a second spinning plate 53, wherein the second spinning plate 53 is connected to the other end of the heating cylinder 52. In the invention, one end of the heating cylinder 52 is connected with the defoaming module 3, so that the resin defoamed by the defoaming device can directly enter the heating cylinder 52 to be reheated to a molten state, the hollow chamber of the defoaming module 3 is funnel-shaped, one side of the funnel opening of the hollow chamber is opposite to the spinning module and is used for containing the spinning generated by the spinning module 2, the hollow chamber is opposite to the second extruder 51, the second extruder 51 penetrates through the hollow chamber of the defoaming device and extends into the heating cylinder 52 to reciprocate, the structural design is simple and compact, and the resin defoamed in the defoaming device can be directly extruded to the heating cylinder 52 to be heated to the molten state and then extruded to be filaments by the second spinneret plate 53.

The second extruder 51 may be a piston extruder, and extrudes the defoamed resin into filaments or into bars, so that the bubbles in the filaments or bars are obviously reduced, and the quality of the finished product is obviously improved.

Preferably, the second spinneret 53 has a spinneret hole, and the second extruder 51 extrudes the molten resin in the heating cylinder 52 at the second spinneret 53, and the resin is extruded through the second spinneret 53 into monofilaments or single rods, which can be used as a raw material for 3D printing. The aperture size of the spinneret orifice of the second spinneret plate 53 is larger than or equal to the aperture size of the spinneret orifice 22 of the first spinneret plate 21 of the defoaming device.

Further, the device also comprises a soft transmission winding module 6 which is arranged on a spinning line below the spinning module 5. The flexible transmission winding module 6 comprises a magnetic drive operating lever 61 and a flexible transmission winding machine 62, and the resin yarn from the spinning module 5 is clamped by the magnetic drive operating lever 61 and is dropped onto the flexible transmission winding machine 62 to be wound. The position of the magnetic drive operating rod is adjustable. In the winding process, along with the increasing of the resin yarns wound on the winding machine, the outer diameter of the winding coil is gradually increased, the rotating speed of the winding machine is unchanged, the winding linear speed is increased, the yarn discharging speed of the spinning module 5 is not increased at the moment, and the discharged yarns are easily tensioned and broken. And a soft transmission winding machine 62 is adopted, the maximum linear speed of the winding wire of the soft transmission winding machine 62 is smaller than the wire outlet speed of the spinning module 5, when the winding linear speed is increased, a transmission belt on the soft transmission winding machine 62 slips with a transmission shaft, the transmission belt does not rotate any more, the winding linear speed is reduced, and the phenomenon that the resin wire outlet is broken by stretching is avoided.

And a material taking port 43 is arranged at the position of the vacuum chamber 4 opposite to the soft transmission rolling module 6 and used for taking out the rolled resin wire from the vacuum chamber 4. The bottom of the vacuum chamber 4 is provided with a plurality of vacuum aerial sockets 44 for connecting the circuits inside and outside the vacuum chamber 4.

Further, the device also comprises a spinning quality online detection module 7 which is arranged on a yarn outlet route between the spinning module 5 and the soft transmission module 6. The vacuum chamber 4 is provided with an observation port 42 on a wire outlet line, and the online quality detection module 7 is arranged outside the observation port 42 of the vacuum chamber 4. The on-line quality detection module 7 comprises an optical microscope 71 and measurement software (not shown in the figure), the optical microscope 71 can record a video of the outgoing filament in real time, the optical microscope 71 can be used for capturing the outgoing filament in real time by controlling the measurement software, the measurement software automatically measures the diameter of the outgoing filament, and whether a large number of bubbles influence the quality of the outgoing filament can be judged by comparing the diameter and the size of the outgoing filament.

Further, the spin forming apparatus is disposed in the vacuum chamber 4. When the molten resin is spun, the heating temperature for heating the resin to a molten state is high, and the resin is easily subjected to degradation reaction with oxygen and moisture in the air at a high temperature during spinning, so that the performance of the resin is reduced. Therefore, the spinning forming device is arranged in the vacuum chamber 4, the oxygen and moisture content in the vacuum chamber 4 is greatly reduced, the possibility of degradation reaction is reduced, and the quality of the resin yarn is better. For example, when the heating temperature of the thermoplastic polyimide is as high as 350 ℃ or higher during heating and melting, the resin is likely to undergo a degradation reaction with moisture and oxygen in the air, and the performance of the resin is deteriorated, and the feeding module 1, the defoaming module 3, and the spinning module 5 are disposed in the vacuum chamber 4, whereby the degradation reaction of the resin can be prevented.

The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in any way, and although the present invention has been disclosed in the preferred embodiment, it is not intended to limit the present invention, and those skilled in the art can make various changes and modifications to the equivalent embodiment without departing from the scope of the present invention.

Claims

1. A method for spinning and molding molten resin is characterized in that: spinning and forming are carried out through a spinning device, the spinning device comprises a feeding module, a spinning module, a defoaming module, a spinning module, a soft transmission rolling module and a vacuum chamber, and the spinning module, the defoaming module, the spinning module and the soft transmission rolling module are arranged in the vacuum chamber;

the defoaming module comprises a hollow cavity arranged below the spinning module;

the spinning module comprises a heating cylinder, a second extruder and a second spinneret plate, the heating cylinder is arranged below the defoaming module, and one end of the heating cylinder is connected with the hollow cavity of the defoaming module; the second extruder penetrates through the hollow cavity of the defoaming device and extends into the heating cylinder to do reciprocating motion; the second spinneret plate is connected with the other end of the heating cylinder; the soft transmission winding module is arranged on a spinning outlet line below the spinning module;

the method comprises the following steps:

s1, feeding;

s2, performing spinning treatment on the molten resin in a vacuum environment;

s3, defoaming the resin after spinning in a vacuum environment;

s4, spinning the defoamed resin in a vacuum environment, cooling and shaping;

s5, winding the spinning in a vacuum environment, and using the spinning as a raw material for 3D printing;

in the step S4, the defoamed resin is extruded by a pushing method and spun into resin filaments by a single-hole or multi-hole spinning method.

2. A molten resin spinning forming method according to claim 1, characterized in that: and vacuumizing after feeding.

3. A molten resin spinning method according to claim 1 or 2, characterized in that: in the step S2, the molten resin is ejected by a spinning method into a plurality of resin filaments.

4. A molten resin spinning forming method according to claim 1, characterized in that: in the step S1, the resin is fed by driving the resin by means of an extruder.

5. The melt resin spinning forming method according to claim 4, wherein: in the step S1, the resin is fed by driving the resin with a screw extruder.

6. A molten resin spinning forming method according to claim 4, characterized in that: in the step S1, the resin is maintained or heated to a molten state by heating during the feeding.

7. A melt resin spinning forming method according to claim 1, characterized in that: and step S5, performing online quality detection on the spinning before the spinning is wound.