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CN-121989542-A - Supercritical foaming thermoplastic polyurethane sheet and extrusion preparation device thereof

CN121989542ACN 121989542 ACN121989542 ACN 121989542ACN-121989542-A

Abstract

The invention discloses a supercritical foaming thermoplastic polyurethane sheet and an extrusion preparation device thereof, which relate to the technical field of polyurethane sheets, and comprise a three-layer composite material layer structure from top to bottom, namely a compact surface layer, a light core layer and a reinforced bottom layer, wherein the high-speed shearing, the pulse directional pushing and the dynamic mixing of raw materials are realized through a bionic premixing component and a preprocessing component, and then axial pulsation is generated by an electromagnetic driven extruder structure, the uniform nucleation and the growth of foam holes of the supercritical fluid are promoted, the foam hole structure and the mechanical property of the foaming sheet are optimized, three-layer independent feeding and co-extrusion molding are realized, and the gradient foaming polyurethane sheet with wear-resistant surface layer, buffer core layer and rebound bottom layer is prepared, and the comprehensive performance is excellent.

Inventors

  • SHI YING
  • LUO ZHENHUAN
  • XU XIAOJUN

Assignees

  • 东莞海博斯新材料科技有限公司
  • 广东海瑞斯新材料股份有限公司

Dates

Publication Date
20260508
Application Date
20260319

Claims (10)

  1. 1. A supercritical foaming thermoplastic polyurethane sheet is characterized in that the polyurethane sheet adopts a three-layer composite material layered structure from top to bottom, and is respectively a compact surface layer, a light core layer and a reinforced bottom layer; The compact surface layer is prepared by taking 100 parts of polyether type TPU as a matrix and adding 1.8% of catalyst DMCHA, 1.0% of catalyst T-120.03% of shear thickening fluid, 0.2% of nucleating agent nano silicon dioxide, and 0.3% of antioxidant and anti-yellowing agent; The light core layer is prepared by taking 100 parts of polyether type TPU as a matrix and adding 2.0% of catalyst DMCHA, 3.0% of catalyst T-120.05% of shear thickening fluid, 0.5% of nucleating agent nano silicon dioxide, and 0.3% of antioxidant and anti-yellowing agent; The reinforcing bottom layer is prepared by taking 100 parts of polyether type TPU as a matrix and adding 2.2% of catalyst DMCHA, 2.0% of catalyst T-120.04% of shear thickening fluid, 0.3% of nucleating agent nano silicon dioxide, and 0.3% of antioxidant and anti-yellowing agent.
  2. 2. The extrusion preparation device for the supercritical foaming thermoplastic polyurethane sheet is characterized by comprising an extrusion frame (1), wherein an extruder (2) is fixedly arranged at the top of the extrusion frame (1) through bolts, an extrusion sheet port (3) is fixedly arranged at a discharge port at the front side of the extruder (2), a bionic premixing component (4) is fixedly arranged at a feed port at the top of the extruder (2), the feed port at the top of the bionic premixing component (4) is fixed with a discharge port of a pretreatment component (5), a feed cylinder (6) is fixedly inserted into the feed port at the top of the pretreatment component (5), and a control cabinet (7) with a control function is fixedly arranged on the side surface of the extrusion frame (1) through bolts.
  3. 3. The supercritical foaming thermoplastic polyurethane sheet and the extrusion preparation device thereof according to claim 2 are characterized in that the bionic premixing component (4) comprises a mounting cylinder (41) fixedly mounted at a feed inlet of an extruder (2), a flow distribution disc (42) with a flow distribution function is fixedly mounted at an upper cylinder opening and a lower cylinder opening of the mounting cylinder (41), blanking pipes (43) and extrusion components (44) are distributed between the upper and lower flow distribution discs (42) of the mounting cylinder (41) in a staggered mode, side valves of the extrusion components (44) are connected with a gas ring (45) through connecting pipes, the blanking pipes (43) are concentrically arranged with through holes formed in the flow distribution disc (42), and a programmable controller (46) for providing electric energy for the extrusion components (44) is fixedly mounted on the inner wall of the mounting cylinder (41) through bolts.
  4. 4. The supercritical foaming thermoplastic polyurethane sheet and the extrusion preparation device thereof according to claim 3 are characterized in that the extrusion assembly (44) comprises a rubber tube (441) fixedly arranged between two groups of flow distribution plates (42), one-way valves (442) with a flow guiding function are fixedly arranged at the upper end and the lower end of the side face of the rubber tube (441), a plurality of groups of elastic rings (443) are distributed on the surface of the rubber tube (441) at equal intervals from top to bottom, electromagnetic springs (444) are fixedly arranged in the elastic rings (443), the side face of the electromagnetic springs (444) and the surface of the elastic rings (443) are fixedly connected with a relay (445), and detection pieces (446) with a data acquisition function are integrally arranged at the top of the relay (445).
  5. 5. The supercritical foaming thermoplastic polyurethane sheet and the extrusion preparation device thereof according to claim 4 are characterized in that the pretreatment component (5) comprises a premixing barrel (51) fixedly arranged at a feed inlet at the top of a mounting barrel (41), a servo motor (52) with a driving function is fixedly arranged on the side surface of the premixing barrel (51) through bolts, a transmission shaft of the servo motor (52) is fixedly inserted into a center hole of a sun wheel of the planetary gear set (53), a shearing shaft (54) is fixedly inserted into the center of a planet wheel of the planetary gear set (53), a star wheel tooth ring of the planetary gear set (53) is fixedly arranged on the side surface of a rotational flow frame (55), and a diversion component (56) is fixedly arranged on the inner wall of the rotational flow frame (55).
  6. 6. The supercritical foaming thermoplastic polyurethane sheet and the extrusion preparation device thereof according to claim 5 are characterized in that the connecting plate body of the cyclone frame (55) is specifically composed of a U-shaped plate (551) and a sealing air plate (552) fixed on the side face of the U-shaped plate (551), air holes are formed in the inner wall of the right side frame body of the cyclone frame (55), a hard air pipe (561) is fixedly inserted into the air holes, the hard air pipe (561) is fixedly connected to an air outlet of a rotary joint (562), and the rotary joint (562) is fixedly arranged at an opening on the side face of the premixing barrel (51).
  7. 7. The supercritical foaming thermoplastic polyurethane sheet and the extrusion preparation device thereof according to claim 6 are characterized in that conical air holes (5521) with a flow guiding effect are formed in the sealing air plate (552), piston plates (5522) are slidably arranged in the conical air holes (5521), elastic bodies (5523) with a resetting effect are fixedly arranged on the side surfaces of the piston plates (5522), and the elastic bodies (5523) are fixedly arranged on the inner sides of rubber sleeves (5524) through connecting rods.
  8. 8. The supercritical foaming thermoplastic polyurethane sheet and the extrusion preparation device thereof according to claim 7 are characterized in that a hollow shaft body (21) is rotatably arranged in the extruder (2), a limiting groove (25) is formed in the shaft body of the hollow shaft body (21), a connecting block (23) is slidably arranged in the limiting groove (25), the connecting block (23) is fixedly arranged on the outer annular wall of a coil block (24) and the inner annular wall of a screw plate (22), the screw plate (22) is slidably arranged on the inner wall of the pipe body of the extruder (2), a permanent magnet shaft (27) is slidably arranged at the center of the coil block (24), a plurality of groups of coil blocks (24) are slidably arranged in the hollow shaft body (21), and a telescopic sleeve (26) is arranged between the two adjacent groups of coil blocks (24).
  9. 9. The supercritical foaming thermoplastic polyurethane sheet and the extrusion preparation device thereof according to claim 8, wherein a plurality of groups of permanent magnets for magnetic field driving are arranged in the permanent magnet shaft (27).
  10. 10. The supercritical foaming thermoplastic polyurethane sheet and extrusion preparation device thereof according to claim 9, wherein the detection piece (446) is an industrial camera with visual sensing function.

Description

Supercritical foaming thermoplastic polyurethane sheet and extrusion preparation device thereof Technical Field The invention relates to the technical field of polyurethane sheets, in particular to a supercritical foaming thermoplastic polyurethane sheet and an extrusion preparation device thereof. Background The existing thermoplastic polyurethane foaming sheet material mostly adopts a single homogeneous structure, is difficult to meet the multiple performance requirements of surface wear resistance, core layer buffering, bottom layer rebound and the like, and is characterized in that the multilayer composite design can realize functional gradientization, but the existing preparation device still has the defects in the aspects of uniform mixing of a multiphase system, accurate regulation and control of supercritical fluid cells, stable forming of multilayer coextrusion interfaces and the like, is easy to cause the problems of uneven cell structure, poor interlayer binding force and the like, and limits the high-end application of the thermoplastic polyurethane foaming sheet material. Disclosure of Invention Accordingly, in order to solve the above-mentioned drawbacks, the present invention provides a supercritical foaming thermoplastic polyurethane sheet and an extrusion preparation device thereof. The invention is realized in such a way that a supercritical foaming thermoplastic polyurethane sheet is constructed, wherein the polyurethane sheet adopts a three-layer composite material layered structure from top to bottom and is respectively a compact surface layer, a light core layer and a reinforced bottom layer; The compact surface layer is prepared by taking 100 parts of polyether type TPU as a matrix and adding 1.8% of catalyst DMCHA, 1.0% of catalyst T-120.03% of shear thickening fluid, 0.2% of nucleating agent nano silicon dioxide, and 0.3% of antioxidant and anti-yellowing agent; The light core layer is prepared by taking 100 parts of polyether type TPU as a matrix and adding 2.0% of catalyst DMCHA, 3.0% of catalyst T-120.05% of shear thickening fluid, 0.5% of nucleating agent nano silicon dioxide, and 0.3% of antioxidant and anti-yellowing agent; The reinforcing bottom layer is prepared by taking 100 parts of polyether type TPU as a matrix and adding 2.2% of catalyst DMCHA, 2.0% of catalyst T-120.04% of shear thickening fluid, 0.3% of nucleating agent nano silicon dioxide, and 0.3% of antioxidant and anti-yellowing agent. The extrusion preparation device for the supercritical foaming thermoplastic polyurethane sheet comprises an extrusion frame, wherein an extruder is fixedly arranged at the top of the extrusion frame through bolts, an extrusion sheet port is fixedly arranged at a discharge port at the front side of the extruder, a bionic pre-mixing assembly is fixedly arranged at a feed inlet at the top of the extruder, the feed inlet at the top of the bionic pre-mixing assembly is fixedly connected with a discharge port of a pre-processing assembly, a charging barrel is fixedly inserted at the feed inlet at the top of the pre-processing assembly, and a control cabinet with a control function is fixedly arranged on the side surface of the extrusion frame through bolts. The bionic premixing assembly comprises an installation cylinder fixedly installed at a feed inlet of an extruder, a flow distribution disc with a flow distribution function is fixedly installed at an upper cylinder opening and a lower cylinder opening of the installation cylinder, a discharging pipe and an extrusion assembly are distributed between the upper flow distribution disc and the lower flow distribution disc of the installation cylinder in a staggered mode, a valve on the side face of the extrusion assembly is connected with a gas ring through a connecting pipe, the discharging pipe is concentrically arranged with a through hole arranged on the flow distribution disc, and a programmable controller for providing electric energy for the extrusion assembly is fixedly installed on the inner wall of the installation cylinder through bolts. The extrusion assembly comprises a rubber tube fixedly arranged between two groups of flow distribution plates, wherein one-way valves with a flow guiding function are fixedly arranged at the upper end and the lower end of the side face of the rubber tube body, a plurality of groups of elastic rings are distributed on the surface of the rubber tube body from top to bottom at equal intervals, electromagnetic springs are fixedly arranged in the elastic rings, the side face of each electromagnetic spring and the surface of each elastic ring are fixedly connected with a relay, and a detection piece with a data acquisition function is integrally arranged at the top of the relay. The pretreatment assembly comprises a premixing barrel fixedly arranged at a feed inlet at the top of the installation barrel, a servo motor with a driving function is fixedly arranged on the side face of the premixing barr