Combined nozzle, reactor and atomization polymerization method

Abstract

The invention relates to the technical field of nozzles, and discloses a combined nozzle, a reactor and an atomization polymerization method. Comprising a rotary atomization component and a cylindrical outer shell, and the rotary atomization component can rotate and is internally provided with an axial first material flow channel; the rotary atomization component is coaxially sleeved with the outer shell, a second material flow channel is formed between the inner wall of the outer shell and the peripheral wall of the rotary atomization component, and the discharging end of the second material flow channel and the discharging end of the first material flow channel are located at the same end of the combined nozzle; and a material A which is atomized and discharged through the material A flow channel and a material B which is atomized and discharged through the material B flow channel converge on respective discharge extension lines. The material easy to block can be arranged in the central rotary atomizing component, and the atomizing effect of the rotary atomizing component is further optimized through the material B pressure nozzle channel.

Description

Technical Field

[0001] The present invention relates to the technical field of nozzles, and particularly to a combined nozzle, a reactor, and an atomization polymerization method. Background Art

[0002] Existing atomizing nozzles are mainly divided into rotary atomizers and pressure atomizing nozzles. Among them, the rotary atomizer uses the centrifugal force of the rotating component to throw the material out at high speed and atomize it (as shown in the disclosure of CN116651637A). Since the mixed material needs to be premixed in the cavity before atomization, it is impossible to achieve uniform distribution of materials under the working conditions that require mixing of multiple materials, and the centrifugal rotation speed required for atomization by a single rotating component is relatively high. As Figure 13 shown, the pressure atomizing nozzle can achieve coaxial arrangement of multiple layers of nozzles and realize the mixing of related materials (as shown in the disclosure of CN202052655U), but for both internal and external materials, pressurized feeding is required. When a certain material is likely to precipitate in a solid state during the reaction process, it is easy to block the nozzle material flow channel. Summary of the Invention

[0003] The purpose of the present invention is to overcome the problem that the nozzle channel is easy to block in the prior art, and provide a combined nozzle, a reactor, and an atomization polymerization method. The present invention can arrange the easily blocked material in the central rotating atomization component, and further optimize the atomization effect of the rotating atomization component through the material B flow channel.

[0004] To achieve the above purpose, on the one hand, the present invention provides a combined nozzle, which includes a rotating atomization component and a cylindrical outer housing. The rotating atomization component can rotate and is internally provided with an axial material A flow channel; the outer housing is coaxially sleeved outside the rotating atomization component, and a material B flow channel is formed between the inner wall of the outer housing and the outer peripheral wall of the rotating atomization component. The discharge end of the material B flow channel and the discharge end of the material A flow channel are located at the same end of the combined nozzle;

[0005] Wherein, the material A atomized and discharged through the material A flow channel and the material B atomized and discharged through the material B flow channel intersect on the extension line of their respective discharges.

[0006] On the second aspect, the present invention provides a reactor, and the feeding part of the reactor is provided with the combined nozzle of the present invention.

[0007] On the third aspect, the present invention provides an atomization polymerization method, which uses the reactor of the present invention, and includes introducing material A into the material A flow channel of the combined nozzle and introducing material B into the material B flow channel, so that material A and material B intersect and contact on the extension line of their respective discharges to carry out a polymerization reaction.

[0008] Through the above technical scheme, the centrifugal force generated by the rotation of the rotary atomizing component of the present invention causes the materials in the material A flow channel and the material B flow channel to stretch into thin films respectively, and disperse the materials at their respective discharge ends and intersect and collide on the extension lines of their respective discharges, thereby further optimizing the atomization effect; and the present invention first sprays and atomizes material A and material B and then brings them into contact, thereby avoiding the problem of nozzle blockage; further, when performing an atomization polymerization operation, the material A flow channel and the material B flow channel respectively carry two kinds of liquids, and the use of the present invention can achieve a better polymerization effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a schematic cross-sectional structure diagram of a combined nozzle according to some embodiments of the present invention;

[0010] Figure 2 Schematic diagrams of cross-sectional structures of combined nozzles of other embodiments of the present invention;

[0011] Figure 3 Schematic diagrams of cross-sectional structures of combined nozzles of other embodiments of the present invention;

[0012] Figure 4 Schematic diagrams of cross-sectional structures of combined nozzles of other embodiments of the present invention;

[0013] Figure 5 yes Figure 4 Sectional view after cutting through the CC section;

[0014] Figure 6 yes Figure 4 Sectional view after cutting through the middle BB section;

[0015] Figure 7 This is a schematic diagram of material A passing through the port;

[0016] Figure 8 is a schematic diagram of a flow guide structure in some embodiments of the present invention;

[0017] Figure 9 are schematic diagrams of flow guide structures in other embodiments of the present invention;

[0018] Figure 10 are schematic diagrams of flow guide structures in other embodiments of the present invention;

[0019] Figure 11 are schematic diagrams of flow guide structures in other embodiments of the present invention;

[0020] Figure 12 yes Figure 8 Schematic diagram of the groove structure of the guide groove after the AA section is cut;

[0021] Figure 13It is a schematic structural diagram of a nozzle in the prior art.

[0022] Reference numerals

[0023] 1 Outer housing; 2 Rotating atomization member; 2.1 Straight pipe section; 2.2 Diverging section; 2.3 Baffle; 2.4 Stopper; 2.5 Top end; 2.6 Material A passage; 3 Flow guide groove of rotating atomization member; 4 Flow guide groove of outer housing; 5 Guide vane of rotating atomization member; 6 Guide vane of outer housing. Specific embodiments

[0024] The following will describe in detail the specific embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for explaining and understanding the present invention, and are not used to limit the present invention.

[0025] In the present invention, unless otherwise stated, the orientation terms such as "inner, outer" refer to the inner and outer of the contour of each component itself, and the terms "upper, lower, top, bottom" are usually used to describe the relative position relationship of each component with respect to the direction shown in the drawings.

[0026] The present invention discloses a combined nozzle, as Figures 1-12 shown, the combined nozzle includes a rotating atomization member 2 and a cylindrical outer housing 1. The rotating atomization member 2 can rotate and has an axial material A flow channel inside; the outer housing 1 is coaxially sleeved outside the rotating atomization member 2, and a material B flow channel is formed between the inner wall of the outer housing 1 and the outer peripheral wall of the rotating atomization member 2. The discharge end of the material B flow channel and the discharge end of the material A flow channel are located at the same end of the combined nozzle;

[0027] Among them, the centrifugal force generated by the rotation of the rotating atomization member causes the materials in the material A flow channel and the material B flow channel to each extend into a thin film, and are dispersed and discharged at their respective discharge ends and collide on the extension lines of their respective discharges, further optimizing the atomization effect, and having the advantage of reducing the rotation speed and power consumption of the rotating atomization member under the same atomization effect. In the present invention, the material A and the material B can be the same material or different materials. When applied to the occasion where the nozzle material flow channel is easily blocked due to solid precipitation during the reaction process, the present invention sprays and atomizes the material A and the material B first and then contacts them, which can avoid the problem of blocking the nozzle.

[0028] When the outlet cross-sectional area of the material is much smaller than the inlet cross-sectional area of the material, the outlet flow rate will be much greater than the inlet flow rate, and it is more conducive to realizing material atomization in the high-speed flow state. In some embodiments of the present invention, the upper opening of the material B flow channel forms a material B inlet, and the lower opening forms a material B outlet. Among them, the ratio of the cross-sectional area of the material B outlet to the cross-sectional area of the material B inlet is φ ≤ 50%, preferably φ ≤ 20%.

[0029] The present invention has no special requirements for the shape of the outer casing, which can be set as Figure 1 shown as a cylindrical section and a conical section connected to the bottom of the cylindrical section with a gradually decreasing diameter downward. In some embodiments of the present invention, an axial fluid cavity is formed in the rotary atomization member. The shape of the fluid cavity can be a waist drum shape or can be set as Figures 1-4 shown. The fluid cavity sequentially includes a straight pipe section 2.1, a transition section, and a gradually expanding section 2.2 with a gradually increasing diameter downward along the material flow direction. Among them, the connection between the straight pipe section 2.1 and the transition section forms a throat; a flow splitting structure is provided at the throat, and the flow splitting structure is used to guide the material A towards the inner wall direction of the material A flow channel.

[0030] In some embodiments of the present invention, the straight pipe section 2.1 is connected to the rotating member. The present invention has no special requirements for the rotating member, as long as it can achieve the rotation of the rotary atomization member 2 around its own central axis, such as a motor.

[0031] In some embodiments of the present invention, referring to Figures 1-4 , Figures 8-9 shown, the rotary atomization member includes an inner casing surrounding the formation of the fluid cavity, and the inner casing has a shape similar to that of the fluid cavity.

[0032] In some embodiments of the present invention, as Figures 1-2 shown, the fluid cavity can be used as the material A flow channel. The flow splitting structure includes a flow splitting member, and the flow splitting member is set as a baffle 2.3 coaxially installed at the throat. The annular gap between the outer peripheral wall of the baffle 2.3 and the wall surface of the throat forms a material A passage 2.6. The material A entering the straight pipe section 2.1 is dispersed through the material A passage and enters the gradually expanding section 2.2 and is close to the wall surface of the gradually expanding section; further, the outer peripheral wall of the baffle 2.3 can be set as an inclined surface, so that the material A passage 2.6 forms a gradually narrowing opening along the material traveling direction. In this way, while guiding the material towards the cavity wall of the fluid cavity, the material traveling speed can be further increased.

[0033] In some other embodiments of the present invention, the outer peripheral wall of the baffle 2.3 is connected to the wall surface of the throat, and a plurality of axial through holes are circumferentially spaced and opened on the outer peripheral wall of the baffle. The axial through holes form the material A passage 2.6. Similarly, the axial through holes can also be set as a gradually narrowing opening along the material traveling direction.

[0034] In some embodiments of the present invention, the setting form of the axial through holes can be one of the three forms as Figure 7 shown. The included angle between the axial through holes and the central axis of the baffle 2.3 is γ, 0° < γ ≤ 60°, preferably 0° < γ ≤ 30°.

[0035] Considering the problem of energy loss during the movement of materials, in some embodiments of the present invention, preferably, the diversion structure includes the aforementioned diversion member and a pre-diversion member disposed on the diversion member. The conical body disposed on the top end surface of the baffle 2.3 forms the pre-diversion member. Specifically, for example, the outer peripheral wall of the baffle 2.3 can be set as an inclined surface. As shown in Figure 1 a conical body with a smaller upper part and a larger lower part is added to the shown baffle, or as shown in Figure 2 , the top end surface of the baffle can extend upward to form an entire conical body, having a smoother flow path. The setting of the diversion structure of the present invention enables material A to be secondarily diverted through the material A passing port after being primarily diverted by the pre-diversion member. It can be understood that the top end of the pre-diversion member can be subjected to a rounding treatment as shown in Figure 2 , and the present invention will not elaborate on this.

[0036] In the present invention, referring to the foregoing, the fluid cavity can directly serve as the material A flow channel, or can be in the setting form as shown in Figures 3-4 . In some embodiments of the present invention, a blocking block 2.4 is coaxially provided in the gradually expanding section 2.2 of the fluid cavity. The main body of the blocking block 2.4 is set as a conical body with a larger lower part and a smaller upper part. The annular gap between the outer wall of the conical body and the inner wall of the gradually expanding section 2.2 of the fluid cavity forms the material A flow channel. The setting of the diversion structure can be the setting of the aforementioned baffle 2.3 and the conical body located on the top end surface of the baffle 2.3. In this embodiment, the form of the material A passing port 2.6 can be as shown in Figure 6 .

[0037] In the present invention, referring to the foregoing, the pre-diversion member can be a conical body disposed on the top end surface of the baffle 2.3, or can be in the setting form as shown in Figure 3 . In some other embodiments of the present invention, the top end portion 2.5 of the blocking block 2.4 extends upward and penetrates through the baffle 2.3. The top end portion 2.5 forms a smooth conical top that tapers upward. The conical top forms the pre-diversion member. In this way, material A is fed from the straight pipe section 2.1, is primarily diverted by the conical top, and then is secondarily diverted through the material A passing port and discharged into the gap between the blocking block and the gradually expanding section 2.2.

[0038] In some embodiments of the present invention, as shown in Figures 3-4 , preferably along the flow direction of material A, the material A flow channel gradually moves away from the central axis of the combined nozzle, and the cross-sectional area of the material A flow channel gradually decreases. In this way, the speed of the material can be increased.

[0039] In some embodiments of the present invention, as shown in Figures 3-4 , the bottom end of the blocking block and the gradually expanding section have a common end surface. A plurality of arc-shaped narrow openings can be equally spaced along the circumferential direction of the material A flow channel on the common end surface. As shown in Figure 5 , these arc-shaped narrow openings form the material A discharge ports.

[0040] In some embodiments of the present invention, the ratio of the bottom area to the top area of the orifice 2.6 of Material A is φ', and φ' ≤ 50%, preferably φ' ≤ 20%.

[0041] In some embodiments of the present invention, the cavity formed by surrounding the outer housing is similar in shape to the rotary atomization member, and also sequentially includes a small-diameter lumen, a transition cavity, and a large-diameter lumen (or a gradually expanding cavity with a gradually increasing diameter from top to bottom) from top to bottom. The rotary atomization member is coaxially sleeved in the cavity formed by surrounding the outer housing, and each part is correspondingly arranged (the straight pipe section is located in the small-diameter lumen, the transition section is located in the transition cavity, and the gradually expanding section is located in the large-diameter lumen). The gap between the two forms a flow path for Material B. It can be understood that in order to enable Material A and Material B to intersect and collide on the extension line of their respective discharges, the flow paths for Material A and Material B in the large-diameter lumen intersect on the extension line along the material flow direction of each.

[0042] To further promote the atomization of the material, in some embodiments of the present invention, a guiding structure that spirally extends around the central axis of the combined nozzle is provided in the flow path for Material B. There are multiple guiding structures, and the multiple guiding structures are equally spaced circumferentially. In some embodiments of the present invention, it is preferred that the number m of the guiding structures ≥ 2, and more preferably 4 ≤ m ≤ 12.

[0043] The inventor found that when the included angle is too small, Material B lacks radial centrifugal force and the atomization degree is not sufficient. When the included angle is too large, Material B deviates too much radially and the mixing degree with Material A is not sufficient, which is not conducive to the progress of the atomization polymerization reaction. After research, in some embodiments of the present invention, it is preferred that the inlet end of the guiding structure is parallel to the central axis of the combined nozzle, and the included angle range between the outlet end of the guiding structure and the central axis of the combined nozzle is 0° to 60°, preferably 0° to 30°. In the present invention, the inlet end refers to the end that first contacts the material, and the other end is the outlet end.

[0044] In some embodiments of the present invention, the guiding structure is provided on the outer peripheral wall of the rotary atomization member 2 and / or the inner wall of the outer housing 1, and preferably the guiding structure is provided as a guiding groove and / or a guiding vane.

[0045] Specifically, the guiding structure is set to Form 1, where Form 1: As Figure 8 or Figure 10 shown, the guiding structure is set to a spirally extending guiding groove opened on the outer peripheral wall of the rotary atomization member 2 and / or the inner wall of the outer housing 1; the orthographic projection of the guiding groove on the longitudinal section of the outer housing 1 or the rotary atomization member 2 has an inverted conical inlet portion to form an inlet end (attached Figure 8 in 3.1 or attached Figure 10In 4.1), the small end of the inlet part spirally extends downward to the bottom of the outer casing or the rotary atomizing member 2 to form an outlet end. Among them, the angle between the outlet end 4.2 of the outer casing guiding groove 4 opened on the inner wall of the outer casing and the central axis of the outer casing is β, and the angle between the outlet end 3.2 of the rotary atomizing member guiding groove 3 located on the outer peripheral wall of the rotary atomizing member 2 and the central axis of the rotary atomizing member 2 is α, 0° < α or β ≤ 60°, preferably 0° < α or β ≤ 30°.

[0046] The present invention has no special requirements for the groove type of the guiding groove. In some embodiments of the present invention, such as Figure 12 shown, the guiding groove can be set as a rectangular groove, a dovetail groove or a U-shaped groove.

[0047] The guiding structure is set as form 2. Among them, form 2: such as Figure 9 or Figure 11 shown, the guiding structure is formed as a helically extending guiding vane provided on the outer peripheral wall of the rotary atomizing member 2 and / or the inner wall of the outer casing 1.

[0048] In some embodiments of the present invention, the positive projection of the guiding vane on the longitudinal section of the outer casing or the rotary atomizing member 2 has an upper short cone and a lower long cone connected by a large end. Among them, the small end of the upper short cone extends vertically upward to form an inlet end (attached Figure 9 in 5.1 or attached Figure 10 in 6.1), the small end of the lower long cone spirally extends downward to the bottom of the outer casing or the rotary atomizing member 2 to form an outlet end. Among them, the angle between the outlet end 6.2 of the outer casing guiding vane 6 opened on the inner wall of the outer casing and the central axis of the outer casing is β', and the angle between the outlet end 5.2 of the rotary atomizing member guiding vane 5 located on the outer peripheral wall of the rotary atomizing member 2 and the central axis of the rotary atomizing member 2 is α', 0° < α' or β' ≤ 60°, preferably 0° < α' or β' ≤ 30°.

[0049] Those skilled in the art can understand that the present invention is not limited to the above-mentioned guiding structure setting forms, and can also be a combination of form 1 and form 2. For example, a guiding groove is provided on the outer peripheral wall of the rotary atomizing member 2, and a guiding vane is provided on the inner wall of the outer casing 1; or a guiding groove is provided on the inner wall of the outer casing 1, and a guiding vane is provided on the outer peripheral wall of the rotary atomizing member 2, which should also fall within the protection scope of the present invention.

[0050] On the basis of the foregoing disclosure, the present invention provides a reactor, and the feeding part of the reactor is provided with the combined nozzle of the present invention. Other settings of the reactor, such as heating devices, pressure devices, etc., can be added according to different reaction types by using the structures and / or methods in the prior art. The present invention has no special requirements for this and will not be elaborated.

[0051] The present invention provides an atomization polymerization method based on the above disclosure. The atomization polymerization method adopts the reactor of the present invention, which has a reaction chamber, a feed part and a discharge part connected to the reaction chamber, the feed part is set as the combined nozzle of the present invention, and the heating method in the prior art is adopted to provide the reaction heat. The method includes introducing material A into the material A flow channel and introducing material B into the material B flow channel, so that material A and material B intersect and contact on the extension lines of their respective discharges to generate a polymerization reaction.

[0052] In some embodiments of the present invention, material A includes oxalic acid diester, and preferably material A includes one or more of dimethyl oxalate, diethyl oxalate, and di-n-propyl oxalate.

[0053] In some embodiments of the present invention, material B includes a diamine, and preferably material B includes one or more of 1,4-butanediamine, 1,5-pentanediamine, and 1,6-hexanediamine.

[0054] In some embodiments of the present invention, the outer edge linear velocity v of the rotary atomizing member 2.2 is ≥ 30 m / s, preferably 50 m / s ≤ v ≤ 150 m / s. It can be understood that the linear velocity v = πDω, where D is the diameter of the rotary atomizing member, ω is the angular velocity of the rotary atomizing member, see the above and attached Figures 1-4 In the present invention, the overall size of the rotary atomizing component gradually increases from the feed end to the discharge end, and the outer edge linear velocity here refers to the linear velocity at the point where the rotary atomizing component has the largest diameter.

[0055] In some embodiments of the present invention, the conditions of the polymerization reaction include: the temperature during atomization polymerization is room temperature to 150°C, and after obtaining polyoxalamide, solid phase polymerization is further performed, the polymerization temperature is 180 to 310°C, and the polymerization time is 1 to 18 hours. It should be noted that the reaction temperature range of the autoclave polymerization in the prior art is 220-350°C, and the reactor of the present invention improves the heat and mass transfer efficiency of the material and can reduce the temperature of the polymerization reaction to 180-310°C.

[0056] In some embodiments of the present invention, the feed molar ratio of material A to material B is 0.9 to 1.1.

[0057] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various specific technical features in any suitable manner. For example, the number of flow channels of the combined nozzle of the present invention is not limited to 2, but multiple material B flow channels can be added, and the multiple material B flow channels are stacked from the inside to the outside. In order to avoid unnecessary repetition, the present invention will not further explain various possible combinations. However, these simple modifications and combinations should also be regarded as the contents disclosed by the present invention, and all belong to the protection scope of the present invention.

Claims

1. A combined nozzle, characterized in that, The combined nozzle includes a rotary atomization member (2) and a cylindrical outer housing (1). The rotary atomization member (2) is rotatable and has an axial material A flow channel inside. The outer housing (1) is coaxially sleeved outside the rotary atomization member (2). A material B flow channel is formed between the inner wall of the outer housing (1) and the outer peripheral wall of the rotary atomization member (2). The discharge ends of the material B flow channel and the material A flow channel are located at the same end of the combined nozzle. Among them, material A atomized and discharged through the material A flow channel and material B atomized and discharged through the material B flow channel intersect on the extension lines of their respective discharges.

2. The combined nozzle according to claim 1, characterized in that, The ports at both ends of the material B flow channel are respectively formed as a material B inlet and a material B outlet. Among them, the ratio of the cross-sectional area of the material B outlet to the cross-sectional area of the material B inlet is φ ≤ 50%, preferably φ ≤ 20%.

3. The combined nozzle according to claim 1, characterized in that, An axial fluid cavity is formed in the rotary atomization member. A flow splitting structure is arranged at the throat in the fluid cavity. The flow splitting structure is used to guide material A to diffuse towards the inner wall of the material A flow channel; and / or The fluid cavity sequentially includes a straight pipe section (2.1), a transition section, and a gradually expanding section (2.2) along the material flow direction. Preferably, the connection between the straight pipe section (2.1) and the transition section is formed as the throat; and / or Preferably, the straight pipe section (2.1) is connected to the rotating part.

4. The combined nozzle according to claim 3, wherein, The flow splitting structure includes a flow splitting part. The flow splitting part is arranged as a baffle (2.3) coaxially installed at the throat. The gap between the outer peripheral wall of the baffle (2.3) and the wall surface of the throat is formed as a material A passage (2.6); or The outer peripheral wall of the baffle (2.3) is connected to the wall surface of the throat, and a plurality of axial through holes are circumferentially spaced on the outer peripheral wall of the baffle. The axial through holes are formed as material A passages (2.6); Preferably, the flow splitting structure includes a flow splitting part and a pre-flow splitting part arranged on the flow splitting part. A cone body arranged on the top surface of the baffle (2.3) is formed as the pre-flow splitting part.

5. The combined nozzle according to claim 4, characterized in that, A blocking block (2.4) is coaxially arranged in the fluid cavity. The annular gap between the outer wall of the blocking block (2.4) and the inner wall of the fluid cavity is formed as the material A flow channel; Preferably, the top end (2.5) of the blocking block (2.4) extends upward and penetrates through the baffle (2.3). The top end (2.5) is an upwardly tapered conical top and is formed as the pre-flow splitting part; and / or Preferably, along the flow direction of material A, the cross-sectional area of the material A flow channel gradually decreases.

6. The combined nozzle according to claim 5, characterized in that, The ratio of the bottom area to the top area of the material A passage (2.6) is φ'. φ' ≤ 50%; preferably φ' ≤ 20%; and / or The included angle between the axial through hole and the central axis of the baffle (2.3) is γ, 0° < γ ≤ 60°, preferably 0° < γ ≤ 30°.

7. The combined nozzle according to claim 1, characterized in that, A guiding structure that spirally extends around the central axis of the combined nozzle is arranged in the material B flow channel. There are multiple guiding structures, and the multiple guiding structures are circumferentially spaced apart; Preferably, the number m of the guiding structures ≥ 2, more preferably 4 ≤ m ≤ 12; and / or Preferably, the inlet end of the flow guiding structure is parallel to the central axis of the combined nozzle, and the included angle between the outlet end of the flow guiding structure and the central axis of the combined nozzle ranges from 0° to 60°, preferably from 0° to 30°.

8. The combined nozzle according to claim 7, characterized in that, The flow guiding structure is arranged on the outer peripheral wall of the rotary atomization member (2) and / or on the inner wall of the outer casing (1). Preferably, the flow guiding structure is arranged as a flow guiding groove and / or a guiding vane.

9. A reactor, characterized in that, The feeding part of the reactor is provided with the combined nozzle according to any one of claims 1-8.

10. An atomization polymerization method, characterized in that, The atomization polymerization method uses the reactor according to claim 9, and includes introducing material A into the material A flow channel of the combined nozzle and introducing material B into the material B flow channel, so that material A and material B meet and contact on the extension line of their respective discharges to carry out a polymerization reaction.

11. The polymerization method according to claim 9, wherein Material A includes oxalic acid diester, preferably includes one or more of dimethyl oxalate, diethyl oxalate, and di-n-propyl oxalate; and / or Material B includes diamine, preferably includes one or more of 1,4-butanediamine, 1,5-pentanediamine, and 1,6-hexanediamine; and / or The outer edge linear velocity v of the rotary atomization member (2.2) is ≥ 30 m / s, preferably 50 m / s ≤ v ≤ 150 m / s; and / or The conditions of the polymerization reaction include: the temperature during atomization polymerization is room temperature to 150 °C, and after obtaining polyoxamide, solid-phase polymerization is further carried out, the polymerization temperature is 180-310 °C, and the polymerization time is 1-18 h; and / or The feeding molar ratio of material A to material B is 0.9-1.1.

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