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CN-122011489-A - Preparation process and device of modified polypropylene foaming material

CN122011489ACN 122011489 ACN122011489 ACN 122011489ACN-122011489-A

Abstract

The invention relates to the technical field of foaming materials, in particular to a preparation process and a device of a modified polypropylene foaming material, the method comprises the steps of sequentially filling polypropylene resin, a modifying auxiliary agent and a foaming agent into the double-screw extruder body through a filling port on the double-screw extruder body, and melting the polypropylene resin and plasticizing the modifying auxiliary agent and the foaming agent in a temperature range of 140-200 ℃ to form a homogeneous system. According to the invention, the polypropylene resin, the modifying additive and the foaming agent are directly injected into the double-screw extruder body to be combined with the input end of the underwater granulator for granulation, so that the modified polypropylene foaming particles can be continuously produced, the production time of the modified polypropylene foaming particles is greatly shortened, the production quality of the modified polypropylene foaming particles can be ensured by the continuous production mode, and the occurrence of different production quality of the modified polypropylene foaming particles is prevented.

Inventors

  • WANG WANSHENG
  • LI YINGQIANG

Assignees

  • 东莞亿轩新材料科技有限公司

Dates

Publication Date
20260512
Application Date
20260206

Claims (10)

  1. 1. A preparation process of a modified polypropylene foaming material is characterized in that polypropylene resin, a modifying additive and a foaming agent are sequentially filled into the inside of a double-screw extruder body (1) through a filling port on the double-screw extruder body (1), the polypropylene resin is melted in a temperature range of 140-200 ℃ and is plasticized with the modifying additive and the foaming agent to form a homogeneous system, the melted homogeneous polypropylene is extruded to the input end of an underwater granulator (2) through the output end of the double-screw extruder (1) under the pressure of 5-25MPa, plastic melt is cut into spherical beads through the underwater granulator (2), and the spherical beads are cooled and shaped in a water pipe of the underwater granulator (2) to obtain modified polypropylene foaming particles.
  2. 2. The preparation process of the modified polypropylene foaming material according to claim 1, wherein the length-diameter ratio of the double-screw extruder body (1) is 240:1, pentane physical foaming agent is injected into the fifth-sixth area in the middle of the double-screw extruder body (1) through a metering pump, the injection amount of the foaming agent is 2-15% of the weight of the polymer, the residence time of materials in a screw is controlled to be not more than 5 minutes, the composition components of the modified additive are polypropylene resin, silicate, a compatibility auxiliary agent and a coupling agent, wherein the silicate is one or more of montmorillonite, kaolin, moscow soil and talcum powder, the particle size is 800 ~ meshes, the compatibility auxiliary agent is maleic anhydride grafted polypropylene, the coupling agent is titanate coupling agent or silane coupling agent, the rotating speed of a cutter of an underwater granulator (2) is 800-1500rpm, the particle size of the modified polypropylene foaming particles is within a range of 0.8-1.5mm, and the temperature fluctuation range of cooling water is controlled to be within +2 ℃ through a circulation system of a cold water machine.
  3. 3. The process for preparing the modified polypropylene foaming material according to claim 2, wherein the temperatures of all the areas of the double-screw extruder body (1) are set to be 120 ℃ in one area, 140 ℃ in two areas, 160 ℃ in three areas, 180 ℃ in four areas, 190 ℃ in five areas, 195 ℃ in six areas, 200 ℃ in seven areas and 200 ℃ in a machine head, and the water content of the obtained modified polypropylene foaming particles is lower than 0.5% under the conditions of water pressure of 0.2-0.35MPa and water temperature of 50-70 ℃ in the underwater granulator (2).
  4. 4. The utility model provides a modified polypropylene foaming material's preparation facilities, its characterized in that, this preparation facilities is applicable to the preparation technology in claim 3, this preparation facilities includes twin-screw extruder body (1), the output of twin-screw extruder body (1) is equipped with under water granulator (2), the output of twin-screw extruder body (1) is equipped with extrudes hood (3), the input of under water granulator (2) is equipped with granulator head (4), be equipped with quick-operation joint (5) on granulator head (4), one side that quick-operation joint (5) is close to extrusion hood (3) is connected with extrusion hood (3), the inside of extrusion hood (3) is equipped with extrusion mechanism, the inside of granulator head (4) is equipped with granulator, the inside movable mounting of extrusion hood (3) has two movable rods (20), movable mounting has loose-leaf ring (19) on movable ring (19), be equipped with auxiliary mechanism on the loose-leaf ring (19).
  5. 5. The preparation device of modified polypropylene foaming material according to claim 4, wherein the extrusion mechanism comprises an extrusion disc (18), a plurality of extrusion holes are formed in the extrusion disc (18), the extrusion holes are communicated with the output end of the double-screw extruder body (1), the granulating mechanism comprises a driving rod (6), a cutter disc (7) and blades (8), the driving rod (6) is arranged on one side, close to the extrusion hood (3), of the granulating machine head (4), a fixed threaded rod (15) is arranged at one end, far away from the granulating machine head (4), of the driving rod (6), a fixed sleeve (12) is connected with the outer side of the fixed threaded rod (15), far away from the driving rod (6), of the fixed sleeve (12) is connected with the cutter disc (7), and a plurality of blades (8) are uniformly arranged on one side, far away from the driving rod (6), of the cutter disc (7).
  6. 6. The preparation device of the modified polypropylene foaming material according to claim 5, wherein a plurality of fixing holes (11) are uniformly formed in one side, close to a driving rod (6), of the cutter head (7), two fixing rods (9) are arranged on the outer side of the driving rod (6), a first slot (13) is formed in one end, close to the cutter head (7), of each fixing rod (9), a first electric telescopic rod (14) is arranged at the bottom end of the inner wall of each first slot (13), the telescopic end of each first electric telescopic rod (14) faces the cutter head (7), a plugging rod (10) is slidably mounted in the first slot (13), one end, close to the corresponding first electric telescopic rod (14), of each plugging rod (10) is connected with the telescopic end of each first electric telescopic rod (14), and one end, close to the cutter head (7), of each plugging rod (10) can be plugged into the fixing holes (11).
  7. 7. The preparation device of the modified polypropylene foaming material according to claim 6, wherein the inner wall of the extrusion hood (3) is provided with a movable sliding groove (21) close to the movable rod (20), the movable sliding groove (21) is internally provided with a movable sliding block (22) in a sliding manner, one side of the movable sliding block (22) close to the movable rod (20) is connected with the movable rod (20), the movable rod (20) is provided with a piezoresistive sensor (23), one side of the movable rod (20) close to the movable ring (19) is provided with a third slot (25), a rotary threaded rod (26) is rotatably arranged in the third slot (25), one end of the movable rod (20) is provided with a rotary motor (24), the output end of the rotary motor (24) movably penetrates through the end wall of the movable rod (20) and is connected with the rotary threaded rod (26), the movable block (27) is slidably arranged in the third slot (25), the rotary threaded rod (26) penetrates through the movable block (27), and one side of the movable block (27) close to the movable ring (19) is connected with the movable ring (19).
  8. 8. The preparation device of the modified polypropylene foaming material according to claim 7, wherein the auxiliary mechanism comprises a scraping plate (31), a displacement sliding groove (28) is formed in the inner wall of the movable ring (19), a plurality of displacement electric sliding blocks (29) are uniformly and slidably arranged in the displacement sliding groove (28), one side, facing the center of the movable ring (19), of the displacement electric sliding blocks (29) is connected with a first electric extension rod (30), the extension end of the first electric extension rod (30) faces the center direction of the movable ring (19), and the extension end of the first electric extension rod (30) is connected with the scraping plate (31).
  9. 9. The device for preparing the modified polypropylene foaming material according to claim 8, wherein a fourth groove (33) and a fifth groove (35) are formed on one side, facing the extrusion disc (18), of the scraper (31), a cleaning brush (34) is movably mounted in the fourth groove (33), and an inserting block (32) is slidably mounted in the fifth groove (35).
  10. 10. The preparation device of the modified polypropylene foaming material according to claim 9, wherein a first chute (37) is formed in the top and the bottom of the inner wall of the fourth slot (33), a first electric sliding block (38) is slidably mounted in the first chute (37), one side, close to the cleaning brush (34), of the first electric sliding block (38) is connected with the cleaning brush (34), a second electric extension rod (36) is mounted at the bottom end of the inner wall of the fifth slot (35), the extension end of the second electric extension rod (36) is far away from the bottom end of the inner wall of the fifth slot (35), and the extension end of the second electric extension rod (36) is connected with the plug-in block (32).

Description

Preparation process and device of modified polypropylene foaming material Technical Field The invention relates to the technical field of foaming materials, in particular to a preparation process and a device of a modified polypropylene foaming material. Background The modified polypropylene foaming material is a light, high-strength, heat-insulating and environment-friendly polymer foam material prepared by performing physical or chemical modification on common polypropylene (PP) to improve the body strength, the thermal stability and the foaming performance of the PP, and then performing a foaming process. The traditional modified polypropylene foaming material production process needs to use a reaction kettle to carry out pressure maintaining operation on raw materials, the raw materials still need to be transferred from the inside of the reaction kettle after the reaction is finished, then the production and processing of the next step are carried out, the intermittent processing mode can not only increase the production time of products, but also can cause different product quality in a batch processing mode, the modified polypropylene particles can be continuously produced by combining a double-screw extruder with an underwater granulator, the underwater granulator can be used for cutting the modified polypropylene, the condition that the modified polypropylene foaming particles adhere to the blades exists, the cutting quality of the blades to the modified polypropylene foaming material can be influenced if the blades are stopped, the manual cleaning of staff is increased, and the production speed of the modified polypropylene foaming particles is influenced. Disclosure of Invention The invention aims to solve the defects in the prior art and provides a preparation process and a device of a modified polypropylene foaming material. In order to achieve the above purpose, the present invention adopts the following technical scheme: A preparation process of modified polypropylene foaming material comprises sequentially filling polypropylene resin, a modifying additive and a foaming agent into the twin-screw extruder body through a filling port on the twin-screw extruder body, melting the polypropylene resin in a temperature range of 140-200 ℃ and plasticizing the modifying additive and the foaming agent to form a homogeneous system, extruding the molten homogeneous polypropylene to the input end of an underwater pelletizer through the output end of the twin-screw extruder under the pressure of 5-25MPa, cutting a plastic melt into spherical beads through the underwater pelletizer, and cooling and shaping the spherical beads in a water pipe of the underwater pelletizer to obtain modified polypropylene foaming particles. Preferably, the length-diameter ratio of the double-screw extruder body is 240:1, pentane physical foaming agent is injected into the fifth-sixth area in the middle of the double-screw extruder body through a metering pump, the injection amount of the foaming agent is 2-15% of the weight of the polymer, the residence time of materials in the screw is controlled to be not more than 5 minutes, the components of the modified auxiliary agent are polypropylene resin, silicate, compatible auxiliary agent and coupling agent, wherein the silicate is one or more of montmorillonite, kaolin, moscow and talcum powder, the particle size is 800 ~ meshes, the compatible auxiliary agent is maleic anhydride grafted polypropylene, the coupling agent is titanate coupling agent or silane coupling agent, the rotating speed of a cutter of an underwater granulator is 800-1500rpm, the particle size of modified polypropylene foaming particles is within the range of 0.8-1.5mm, and the temperature fluctuation range of cooling water is controlled to be within +2 ℃ through a circulating system of a cold water machine. Preferably, the temperatures of all the areas of the body of the twin-screw extruder are set to be 120 ℃ in one area, 140 ℃ in two areas, 160 ℃ in three areas, 180 ℃ in four areas, 190 ℃ in five areas, 195 ℃ in six areas, 200 ℃ in seven areas and 200 ℃ in a machine head, and the water content of the obtained modified polypropylene foaming particles is lower than 0.5% under the conditions of water pressure of 0.2-0.35MPa and water temperature of 50-70 ℃ in an underwater granulator. The utility model provides a modified polypropylene foaming material's preparation facilities, this preparation facilities is applicable to foretell preparation process, and this preparation facilities includes the twin-screw extruder body, the output of twin-screw extruder body is equipped with the granulator under water, and the output of twin-screw extruder body is equipped with extrudes the hood, and the input of granulator under water is equipped with the granulator head, is equipped with quick-operation joint on the granulator head, and one side that quick-operation joint is close to the extruder hood is connected with the