A low shrinkage modified polypropylene material and its production process and equipment

Abstract

The invention relates to the technical field of polypropylene material processing, and in particular to a low-shrinkage modified polypropylene material and a production process and equipment thereof, comprising a granulating mechanism, an extruding mechanism, a mixing mechanism and a bottom plate, wherein the mixing mechanism comprises a main mixing element, a plurality of auxiliary mixing elements, a barrel cover and a mixing barrel, wherein the main mixing element comprises a plurality of main mixing rods, a main mixing shaft and a main motor, wherein the auxiliary mixing element comprises a plurality of auxiliary mixing rods, an auxiliary mixing shaft and an auxiliary motor, wherein a feed pipe is arranged above the barrel cover, a plurality of first heating rods are arranged on the inner wall of the mixing barrel, and a discharge pipe is arranged below the mixing barrel. The production equipment of the present design integrates the mixing mechanism, the extruding mechanism and the granulating mechanism to form a compact and fully functional production line, wherein the integrated design reduces the number of times the raw materials are transferred between a plurality of independent devices, thereby reducing the variables and uncertainties that may occur during the transfer process.

Description

Technical Field

[0001] The invention relates to the technical field of polypropylene material processing, in particular to a low-shrinkage modified polypropylene material and a production process and equipment thereof. Background Art

[0002] Polypropylene (PP) is a crystalline polymer with a regular structure. It has the advantages of easy processing, high impact strength, good flexibility and electrical insulation, and good chemical resistance. It is widely used in the automotive industry, home appliances, electronics, packaging, building materials and furniture. However, PP also has some shortcomings, such as poor cold resistance, brittle fracture at low temperatures, large shrinkage, poor creep resistance, poor product dimensional stability and easy warping deformation.

[0003] The prior art patent CN107501771A discloses a low shrinkage modified polypropylene material and a preparation method thereof, which is prepared by mixing, extruding and granulating with 30-60 parts of polypropylene, 10-50 parts of polystyrene, 5-15 parts of maleic anhydride grafted polystyrene-ethylene-butylene-styrene block copolymer, 3-10 parts of maleic anhydride grafted ethylene-octene copolymer, 0-30 parts of inorganic filler, 0.1-1 parts of primary antioxidant, 0.1-1 parts of secondary antioxidant, 0.1-1 parts of light stabilizer and 0.5-1 parts of dispersant. The prior art uses polystyrene to reduce the shrinkage of the modified polypropylene material, and the addition of a corresponding toughening agent can also improve the toughness of the product.

[0004] However, in the above-mentioned prior art, since the mixing, extrusion and granulation processes of the low shrinkage modified polypropylene material processing are all independent equipment, there are more variables and uncertainties in the process of conveying the raw materials, which in turn affects the production quality. Summary of the invention

[0005] The object of the present invention is to provide a low shrinkage modified polypropylene material and a production process and equipment thereof, so as to solve the technical problem in the prior art that since the mixing, extrusion and granulation processes of the low shrinkage modified polypropylene material processing are all independent equipment, there are more variables and uncertainties in the process of conveying the raw materials, which in turn affects the production quality.

[0006] To achieve the above-mentioned purpose, the present invention provides a low-shrinkage modified polypropylene material production equipment, including a granulating mechanism, an extrusion mechanism, a mixing mechanism and a bottom plate, the mixing mechanism includes a main mixing element, a plurality of auxiliary mixing elements, a barrel cover and a mixing barrel, the main mixing element includes a plurality of main mixing rods, a main mixing shaft and a main motor, the auxiliary mixing element includes a plurality of auxiliary mixing rods, an auxiliary mixing shaft and an auxiliary motor, a feed pipe is arranged above the barrel cover, a plurality of first heating rods are arranged on the inner wall of the mixing barrel, a discharge pipe is arranged below the mixing barrel, the plurality of main mixing rods are arranged on the outside of the main mixing shaft, and the main mixing shaft is arranged at the output end of the main motor. , the main motor is arranged above the barrel cover, and a plurality of the main mixing rods extend into the mixing barrel, a plurality of the auxiliary mixing rods are arranged on the outside of the auxiliary mixing shaft, the auxiliary mixing shaft is arranged at the output end of the auxiliary motor, the auxiliary motor is arranged on the outside of the mixing barrel, and a plurality of the auxiliary mixing rods extend into the mixing barrel, the granulating mechanism is arranged at one end of the bottom plate, the granulating mechanism is also arranged at the discharge end of the extrusion mechanism, the extrusion mechanism is arranged in the middle of the bottom plate, the mixing barrel is fixedly connected to the bottom plate and is located at the other end of the bottom plate, and the discharge pipe is connected to the feed end of the extrusion mechanism.

[0007] Wherein, a material guide seat is arranged at the inner bottom of the mixing barrel, and the inner side of the material guide seat has a conical surface.

[0008] Wherein, the auxiliary mixing shafts in the plurality of auxiliary mixing elements are arranged in an inclined shape around the outer side of the mixing barrel.

[0009] Wherein, the extrusion mechanism includes an extrusion cover, an auger and an extrusion barrel, the end face of the extrusion cover has an extrusion hole, one end of the extrusion barrel has an outlet end, the top of the extrusion barrel has an inlet end, and the other end of the extrusion barrel is provided with an extrusion motor, the extrusion cover is threadedly connected to the extrusion barrel and covers the outlet end, the auger is transmission-connected to the extrusion motor and is located at the output end of the extrusion motor and is also located in the extrusion barrel, the extrusion barrel is fixedly connected to the bottom plate and is located in the middle of the bottom plate, and the granulation mechanism is also arranged at the extrusion cover, and the discharge pipe is connected to the inlet end.

[0010] Wherein, a heat conducting plate is arranged on the inner wall of the extrusion barrel, and a conduction cavity is formed between the heat conducting plate and the extrusion barrel, and a plurality of second heating rods are arranged in the conduction cavity.

[0011] There are three groups of extrusion holes, each group has a plurality of holes, and the three groups of extrusion holes are arranged in sequence from bottom to top.

[0012] The present invention also provides a low shrinkage modified polypropylene material, which is processed by the low shrinkage modified polypropylene material production equipment as described above, and the low shrinkage modified polypropylene material is mixed with polypropylene, inorganic filler, dispersant, polystyrene, maleic anhydride grafted polystyrene-ethylene-butylene-styrene block copolymer, maleic anhydride grafted ethylene-octene copolymer, main antioxidant, auxiliary antioxidant and light stabilizer.

[0013] The present invention also provides a low shrinkage modified polypropylene material production process, which is applied to the low shrinkage modified polypropylene material production equipment described above, and comprises the following steps:

[0014] First, 30-60 parts of polypropylene, 0-30 parts of inorganic filler, and 0.5-1 part of dispersant are put into the mixing barrel, and then the temperature in the mixing barrel reaches 80-90° C. using the first heating rods, and then the main mixing element and the secondary mixing element are mixed for 3-8 minutes;

[0015] Then add 10-50 parts of polystyrene, 5-15 parts of maleic anhydride grafted polystyrene-ethylene-butylene-styrene block copolymer, 3-10 parts of maleic anhydride grafted ethylene-octene copolymer, 0.1-1 parts of primary antioxidant, 0.1-1 parts of auxiliary antioxidant, and 0.1-1 parts of light stabilizer and continue mixing for 3-8 minutes;

[0016] The mixed material is discharged into the extrusion barrel through the discharge pipe, and the temperature of each zone in the extrusion barrel reaches 180-210°C based on the plurality of the second heating rods, and then the extrusion motor is started, and the mixed material is extruded to the extrusion cover based on the auger, and then the mixed material is formed into long strips based on the extrusion holes on the extrusion cover, and finally the final low shrinkage modified polypropylene material is obtained by cutting through the granulation mechanism.

[0017] The invention discloses a low shrinkage modified polypropylene material and a production process and equipment thereof, comprising a granulating mechanism, an extruding mechanism, a mixing mechanism and a bottom plate, wherein the mixing mechanism comprises a main mixing element, a plurality of auxiliary mixing elements, a barrel cover and a mixing barrel, wherein the main mixing element comprises a plurality of main mixing rods, a main mixing shaft and a main motor, wherein the auxiliary mixing element comprises a plurality of auxiliary mixing rods, an auxiliary mixing shaft and an auxiliary motor, wherein a feed pipe is arranged above the barrel cover, a plurality of first heating rods are arranged on the inner wall of the mixing barrel, and a discharge pipe is arranged below the mixing barrel. The production equipment of the present design integrates the mixing mechanism, the extruding mechanism and the granulating mechanism to form a compact and fully functional production line, wherein the integrated design reduces the number of times the raw materials are transferred between a plurality of independent devices, thereby reducing the variables and uncertainties that may occur during the transfer process, and in this way effectively solves the technical problem that since the mixing, extruding and granulating processes of the low shrinkage modified polypropylene material are all independent devices, more variables and uncertainties are easily present in the process of transferring the raw materials, thereby affecting the production quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0019] Figure 1 It is a front view of the first embodiment of the present invention.

[0020] Figure 2 The present invention Figure 1 Section view along line AA.

[0021] Figure 3 is a side view of a second embodiment of the present invention.

[0022] Figure 4 The present invention Figure 3 Cross-sectional view along line BB.

[0023] Figure 5 The present invention Figure 4 Sectional view along the CC line.

[0024] Figure 6 Schematic diagram of the structure of the extrusion cover in the second embodiment of the present invention.

[0025] Figure 7 It is a three-dimensional stereogram of the third embodiment of the present invention.

[0026] Figure 8 is a side view of a third embodiment of the present invention.

[0027] Fig. 9 The present invention Figure 8Sectional view along line DD.

[0028] Fig.10 The present invention is a flowchart of the steps of a production process of a low shrinkage modified polypropylene material.

[0029] 101-granulation mechanism, 102-extrusion mechanism, 103-bottom plate, 104-barrel cover, 105-mixing barrel, 106-main mixing rod, 107-main mixing shaft, 108-main motor, 109-secondary mixing rod, 110-secondary mixing shaft, 111-secondary motor, 112-feeding pipe, 113-first heating rod, 114-discharging pipe, 115-material guide seat, 116-conical surface, 201-extrusion cover, 202-auger, 203-extrusion barrel, 204-extrusion Exit hole, 205-export end, 206-inlet end, 207-extrusion motor, 208-heat conducting plate, 209-conduction chamber, 210-second heating rod, 301-cutter, 302-hydraulic cylinder, 303-bracket, 304-moving plate, 305-cutting plate, 306-inclined plate, 307-connecting rod, 308-C-shaped plate, 309-telescopic rod, 310-collecting box, 311-convex block, 312-connecting block, 313-convex groove, 314-connecting groove. DETAILED DESCRIPTION

[0030] Embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0031] First embodiment:

[0032] See also Figure 1-2 ,in Figure 1 is a front view of a first embodiment of the present invention, Figure 2 The present invention Figure 1 Section view along line AA.

[0033] The present invention provides a low-shrinkage modified polypropylene material production equipment, comprising a granulating mechanism 101, an extruding mechanism 102, a mixing mechanism and a bottom plate 103, wherein the mixing mechanism comprises a main mixing element, a plurality of auxiliary mixing elements, a barrel cover 104 and a mixing barrel 105, wherein the main mixing element comprises a plurality of main mixing rods 106, a main mixing shaft 107 and a main motor 108, wherein the auxiliary mixing element comprises a plurality of auxiliary mixing rods 109, an auxiliary mixing shaft 110 and an auxiliary motor 111, wherein a feed pipe 112 is arranged above the barrel cover 104, and an inner wall of the mixing barrel 105 is arranged There are a plurality of first heating rods 113, a discharge pipe 114 is arranged below the mixing barrel 105, a plurality of main mixing rods 106 are arranged outside the main mixing shaft 107, the main mixing shaft 107 is arranged at the output end of the main motor 108, the main motor 108 is arranged above the barrel cover 104, and a plurality of main mixing rods 106 extend into the mixing barrel 105, a plurality of auxiliary mixing rods 109 are arranged outside the auxiliary mixing shaft 110, and the auxiliary mixing shaft 110 is arranged at the output end of the auxiliary motor 111. The auxiliary motor 111 is arranged on the outside of the mixing barrel 105, and the plurality of auxiliary mixing rods 109 extend into the mixing barrel 105. The granulating mechanism 101 is arranged at one end of the bottom plate 103. The granulating mechanism 101 is also arranged at the discharge end of the extruding mechanism 102. The extruding mechanism 102 is arranged in the middle of the bottom plate 103. The mixing barrel 105 is fixedly connected to the bottom plate 103 and is located at the other end of the bottom plate 103. The discharge pipe 114 is connected to the feed end of the extruding mechanism 102. The main mixing rod 106 and the auxiliary mixing rod 109 of the present design are driven by the main motor 108 and the auxiliary motor 111 to stir the raw materials in the mixing barrel 105 to improve the mixing efficiency; the first heating rod 113 is arranged on the inner wall of the mixing barrel 105 to heat the raw materials and promote the mixing and reaction of the raw materials. The granulating mechanism 101, the extruding mechanism 102, the mixing mechanism and the bottom plate 103 together constitute a complete production equipment, which can realize the whole process from raw material mixing to final granulation.

[0034] Among them, a material guide seat 115 is provided at the inner bottom of the mixing barrel 105, and the inner side of the material guide seat 115 has a conical surface 116. The inner side of the material guide seat 115 has a conical surface 116, which helps the raw materials to flow and mix better during the mixing process and facilitates discharge.

[0035] Secondly, the auxiliary mixing shafts 110 in the plurality of auxiliary mixing elements are arranged in an inclined manner around the outer side of the mixing barrel 105. This design can increase the stirring area and strength of the auxiliary mixing rods 109 on the raw materials, further improving the mixing efficiency.

[0036] When using the low shrinkage modified polypropylene material production equipment of this embodiment, the raw materials to be processed are fed into the mixing barrel 105 through the feed pipe 112 arranged above the barrel cover 104. At this time, the material guide seat 115 in the mixing barrel 105 helps to evenly distribute the raw materials. The first heating rod 113 in the mixing barrel 105 is started to heat the raw materials. At the same time, the main mixing element starts to work to preliminarily mix the heated raw materials. The main mixing rod 106 moves in the mixing barrel 105 with the rotation of the main mixing shaft 107 to promote uniform mixing of the raw materials. On the basis of preliminary mixing, The auxiliary mixing element also starts to work. The plurality of auxiliary mixing rods 109 are arranged in an inclined shape around the outer side of the mixing barrel 105. As the auxiliary mixing shaft 110 rotates, the auxiliary mixing rods 109 perform more detailed stirring and mixing in the mixing barrel 105 to ensure that the raw materials are fully mixed and evenly mixed. The fully mixed raw materials are discharged through the discharge pipe 114 and enter the feed end of the extrusion mechanism 102. The extrusion mechanism 102 extrude the mixed raw materials to form the required long strips of low shrinkage modified polypropylene material. Finally, the extruded material is cut into granules through the granulation mechanism 101 for subsequent use or processing.

[0037] Second embodiment:

[0038] Based on the first embodiment, please refer to Figure 3 to Figure 6 ,in Figure 3 is a side view of a second embodiment of the present invention, Figure 4 The present invention Figure 3 The cross-sectional view of the BB line. Figure 5 The present invention Figure 4 Cross-sectional view of the CC line, Figure 6 Schematic diagram of the structure of the extrusion cover in the second embodiment of the present invention.

[0039] The present invention provides a production device for a low-shrinkage modified polypropylene material. The extrusion mechanism 102 comprises an extrusion cover 201, an auger 202 and an extrusion barrel 203. The end surface of the extrusion cover 201 has an extrusion hole 204. One end of the extrusion barrel 203 has an outlet end 205. The upper part of the extrusion barrel 203 has an inlet end 206. The other end of the extrusion barrel 203 is provided with an extrusion motor 207. The extrusion cover 201 is threadedly connected to the extrusion barrel 203 and covers the outlet end 205. The auger 202 is transmission-connected to the extrusion motor 207 and is located at the extrusion motor 207. The output end of the extrusion barrel 203 is also located in the extrusion barrel 203, the extrusion barrel 203 is fixedly connected to the bottom plate 103 and is located in the middle of the bottom plate 103, and the granulation mechanism 101 is also arranged at the extrusion cover 201, the discharge pipe 114 is communicated with the inlet end 206, the auger 202 of the present design is driven by the extrusion motor 207 to extrude and convey the raw materials in the extrusion barrel 203 to realize the granulation pressure process, the extrusion hole 204 on the extrusion cover 201 is used to discharge the granulated product, and the arrangement of multiple groups of extrusion holes 204 can improve production efficiency.

[0040] Among them, a heat conducting plate 208 is provided on the inner wall of the extrusion barrel 203, and a conduction cavity 209 is formed between the heat conducting plate 208 and the extrusion barrel 203, and a plurality of second heating rods 210 are provided in the conduction cavity 209. The heat conducting plate 208 and the second heating rods 210 together constitute a heating system for heating the raw materials during the extrusion process to ensure the plasticity and fluidity of the raw materials, thereby obtaining a better granulation effect.

[0041] Secondly, the number of the extrusion holes 204 is three groups, each group has a plurality of holes, and the three groups of extrusion holes 204 are arranged in sequence from bottom to top.

[0042] When using the low shrinkage modified polypropylene material production equipment of this embodiment, the auger 202 of this design is driven by the extrusion motor 207 to extrude and convey the raw materials in the extrusion barrel 203 to realize the granulation pressure process. The extrusion holes 204 on the extrusion cover 201 are used to discharge the granulated products. The setting of multiple groups of extrusion holes 204 can improve production efficiency. The heat conduction plate 208 and the second heating rod 210 together constitute a heating system for heating the raw materials during the extrusion process to ensure the plasticity and fluidity of the raw materials, thereby obtaining a better granulation effect.

[0043] Third embodiment:

[0044] Based on the second embodiment, please refer to Figure 7 to Figure 9 ,in Figure 7is a three-dimensional stereogram of a third embodiment of the present invention, Figure 8 is a side view of a third embodiment of the present invention, Fig. 9 The present invention Figure 8 Sectional view along line DD.

[0045] The present invention provides a production device for a modified polypropylene material with a low shrinkage rate. The granulation mechanism 101 comprises a plurality of cutters 301, two hydraulic cylinders 302, a bracket 303 and a movable plate 304. A plurality of cutting plates 305 are arranged on the inner side of the bracket 303. An inclined plate 306 is arranged at one end of the cutting plate 305. A connecting rod 307 is arranged at the output end of the hydraulic cylinder 302. The plurality of cutters 301 are respectively fixedly connected to the corresponding connecting rods 307 and are located between the two connecting rods 307 and directly above the corresponding cutting plates 305. Each group of extrusion holes 204 is located between the corresponding cutters 301 and the cutting plates 305. The two hydraulic cylinders 302 are respectively fixedly connected to the bracket 303 and are symmetrically arranged above the bracket 303. The bracket 303 is fixedly connected to the movable plate 304 and is located above the movable plate 304. The movable plate 304 is arranged at one end of the bottom plate 103, and the plurality of cutting plates 305 are all in contact with the extrusion cover 201. The connecting rod 307 is pushed by the hydraulic cylinder 302, thereby driving the cutter 301 to perform cutting action. This design can provide a stable and powerful cutting force to ensure that the polypropylene material can be cut into particles evenly and efficiently. The design of the cutting plate 305 can assist the cutting process to ensure a smooth cutting surface. At the same time, the cooperation between the cutter 301 and the cutting plate 305 can reduce material waste during the cutting process. The design of the inclined plate 306 helps to guide the material particles after cutting to slide smoothly, avoid the accumulation of particles inside the equipment, and thus improve production efficiency.

[0046] The granulation mechanism 101 also includes a C-shaped plate 308 and a collecting box 310. The C-shaped plate 308 is fixedly connected to the movable plate 304 and is located above the movable plate 304. The collecting box 310 is slidably connected to the movable plate 304 and is in contact with the top of the movable plate 304, and is also attached to the inner side of the C-shaped plate 308. The design of the C-shaped plate 308 provides a stable positioning structure for the collecting box 310, and also helps to guide the cut material particles into the collecting box 310. The collecting box 310 can be easily slid out and into the equipment, which is convenient for collecting and cleaning the cut material particles and improving the convenience of operation.

[0047] Two convex blocks 311 and a connecting block 312 are arranged below the movable plate 304, and the connecting block 312 is driven by the telescopic rod 309. The upper end surface of the base plate 103 has a convex groove 313 and a connecting groove 314, and the convex block 311 is located in the convex groove 313, and the connecting block 312 is located in the connecting groove 314. This design ensures the stability and accuracy of the movable plate 304 on the base plate 103. At the same time, the connecting block 312 is driven by the telescopic rod 309, and the position of the movable plate 304 can be easily adjusted, so as to increase the distance between the bracket 303 and the extrusion barrel 203, and then facilitate the replacement of the extrusion cover 201 to meet the cutting requirements of materials of different sizes or shapes.

[0048] When using the low shrinkage modified polypropylene material production equipment of this embodiment, the extruded material strip contacts the multiple cutting plates 305 located on the movable plate 304, and these cutting plates 305 are in conflict with the extrusion cover 201. In preparation for cutting, the two hydraulic cylinders 302 are started, and their output ends push the connecting rod 307 to move downward. Since the cutter 301 is fixed on the connecting rod 307, the cutter 301 also moves downward. As the cutter 301 moves downward, the long strip of low shrinkage modified polypropylene material located between the cutter 301 and the cutting plate 305 is cut off, and the inclined plate 306 guides the cut material particles into the collection box 310.

[0049] The present invention also provides a low shrinkage modified polypropylene material, which is processed by the low shrinkage modified polypropylene material production equipment as described above, and the low shrinkage modified polypropylene material is prepared by stirring and mixing silicate cement, light fine sand, hydroxypropyl methylcellulose, silane-modified polyurethane resin, rubber powder, water repellent, polymer short fibers, water reducing agent and an appropriate amount of water.

[0050] In this embodiment, due to the interaction between silane-modified polyurethane resin, rubber powder, polymer short fibers, hydroxypropyl methylcellulose, etc., they can penetrate into the surface layer of the tile veneer and form a dense network structure with other components of the mortar, which has high strength and long-lasting adhesion, making it difficult for free calcium hydroxide in the grouting mortar to penetrate, making it difficult for the ceramic tile to fall off, and having excellent waterproof performance.

[0051] Based on the third embodiment, please refer to Fig.10 ,in Fig.10 The present invention is a flowchart of the steps of a production process of a low shrinkage modified polypropylene material.

[0052] The present invention also provides a low shrinkage modified polypropylene material production process, which is applied to the low shrinkage modified polypropylene material production equipment described above, and comprises the following steps:

[0053] S1: First, 30-60 parts of polypropylene, 0-30 parts of inorganic fillers, and 0.5-1 parts of dispersants are placed in the mixing barrel 105, and then the temperature in the mixing barrel 105 reaches 80-90° C. using the first heating rods 113, and then the main mixing element and the secondary mixing element are mixed for 3-8 minutes;

[0054] S2: Add 10-50 parts of polystyrene, 5-15 parts of maleic anhydride grafted polystyrene-ethylene-butylene-styrene block copolymer, 3-10 parts of maleic anhydride grafted ethylene-octene copolymer, 0.1-1 parts of primary antioxidant, 0.1-1 parts of auxiliary antioxidant, and 0.1-1 parts of light stabilizer and continue mixing for 3-8 minutes;

[0055] S3: The mixed material is discharged into the extrusion barrel 203 through the discharge pipe 114, and the temperature of each zone in the extrusion barrel 203 reaches 180-210°C based on the plurality of second heating rods 210, and then the extrusion motor 207 is started, and the mixed material is extruded to the extrusion cover 201 based on the auger 202, and then the mixed material is formed into a long strip based on the extrusion hole 204 on the extrusion cover 201, and finally the final low shrinkage modified polypropylene material is obtained by cutting through the granulation mechanism 101.

[0056] What is disclosed above is only one or more preferred embodiments of the present application, and cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiments and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A low shrinkage modified polypropylene material production equipment, characterized in that: The invention comprises a granulating mechanism, an extruding mechanism, a mixing mechanism and a bottom plate, wherein the mixing mechanism comprises a main mixing element, a plurality of auxiliary mixing elements, a barrel cover and a mixing barrel, wherein the main mixing element comprises a plurality of main mixing rods, a main mixing shaft and a main motor, wherein the auxiliary mixing element comprises a plurality of auxiliary mixing rods, an auxiliary mixing shaft and an auxiliary motor, wherein a feed pipe is arranged above the barrel cover, a plurality of first heating rods are arranged on the inner wall of the mixing barrel, a discharge pipe is arranged below the mixing barrel, the plurality of main mixing rods are arranged on the outside of the main mixing shaft, the main mixing shaft is arranged at the output end of the main motor, and the main motor is arranged above the barrel cover. , and a plurality of the main mixing rods extend into the mixing barrel, a plurality of the auxiliary mixing rods are all arranged on the outside of the auxiliary mixing shaft, the auxiliary mixing shaft is arranged at the output end of the auxiliary motor, the auxiliary motor is arranged on the outside of the mixing barrel, and a plurality of the auxiliary mixing rods extend into the mixing barrel, the granulating mechanism is arranged at one end of the bottom plate, the granulating mechanism is also arranged at the discharge end of the extrusion mechanism, the extrusion mechanism is arranged in the middle of the bottom plate, the mixing barrel is fixedly connected to the bottom plate and is located at the other end of the bottom plate, and the discharge pipe is connected to the feed end of the extrusion mechanism.

2. The low shrinkage modified polypropylene material production equipment according to claim 1, characterized in that: The inner bottom of the mixing barrel is provided with a material guide seat, and the inner side of the material guide seat has a conical surface.

3. The low shrinkage modified polypropylene material production equipment according to claim 2, characterized in that: The auxiliary mixing shafts in the plurality of auxiliary mixing elements are arranged in an inclined manner around the outer side of the mixing barrel.

4. The low shrinkage modified polypropylene material production equipment according to claim 3, characterized in that: The extrusion mechanism comprises an extrusion cover, an auger and an extrusion barrel, the end face of the extrusion cover is provided with an extrusion hole, one end of the extrusion barrel is provided with an outlet end, the upper part of the extrusion barrel is provided with an inlet end, the other end of the extrusion barrel is provided with an extrusion motor, the extrusion cover is threadedly connected to the extrusion barrel and covers the outlet end, the auger is transmission-connected to the extrusion motor and is located at the output end of the extrusion motor and is also located in the extrusion barrel, the extrusion barrel is fixedly connected to the bottom plate and is located in the middle of the bottom plate, and the granulation mechanism is also provided at the extrusion cover, and the discharge pipe is communicated with the inlet end.

5. The low shrinkage modified polypropylene material production equipment according to claim 4, characterized in that: A heat conducting plate is disposed on the inner wall of the extrusion barrel, and a conduction cavity is formed between the heat conducting plate and the extrusion barrel, wherein a plurality of second heating rods are disposed in the conduction cavity.

6. The low shrinkage modified polypropylene material production equipment according to claim 5, characterized in that: The number of the extrusion holes is three groups, the number of each group is a plurality, and the three groups of extrusion holes are arranged in sequence from bottom to top.

7. A low shrinkage modified polypropylene material, produced by the low shrinkage modified polypropylene material production equipment as claimed in claim 1, characterized in that: The low shrinkage modified polypropylene material is prepared by mixing polypropylene, inorganic filler, dispersant, polystyrene, maleic anhydride grafted polystyrene-ethylene-butylene-styrene block copolymer, maleic anhydride grafted ethylene-octene copolymer, primary antioxidant, auxiliary antioxidant and light stabilizer.

8. A process for producing a low shrinkage modified polypropylene material, applied to the low shrinkage modified polypropylene material production equipment as claimed in claim 6, characterized in that: The steps include: First, 30-60 parts of polypropylene, 0-30 parts of inorganic filler, and 0.5-1 part of dispersant are put into the mixing barrel, and then the temperature in the mixing barrel reaches 80-90° C. using the first heating rods, and then the main mixing element and the secondary mixing element are mixed for 3-8 minutes; Then add 10-50 parts of polystyrene, 5-15 parts of maleic anhydride grafted polystyrene-ethylene-butylene-styrene block copolymer, 3-10 parts of maleic anhydride grafted ethylene-octene copolymer, 0.1-1 parts of primary antioxidant, 0.1-1 parts of auxiliary antioxidant, and 0.1-1 parts of light stabilizer and continue mixing for 3-8 minutes; The mixed material is discharged into the extrusion barrel through the discharge pipe, and the temperature of each zone in the extrusion barrel reaches 180-210°C based on the plurality of the second heating rods, and then the extrusion motor is started, and the mixed material is extruded to the extrusion cover based on the auger, and then the mixed material is formed into long strips based on the extrusion holes on the extrusion cover, and finally the final low shrinkage modified polypropylene material is obtained by cutting through the granulation mechanism.

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