A modified plastic preparation process and modified plastic

Abstract

The invention belongs to the field of plastic preparation, and in particular relates to a modified plastic preparation process and the modified plastic. The process comprises the following steps: step one: mixing and heating plastic and an additive to obtain a modified plastic raw material; step two: adding the modified plastic raw material into a preparation device; step three: extruding the modified plastic raw material to obtain a plastic strip; step four: granulating the plastic strip; step five: performing a circulation cooling process on the plastic particles; and step six: collecting and drying the plastic particles. The modified plastic comprises the following raw materials in parts by weight: 30 parts of polypropylene, 24 parts of polyvinyl chloride, 0.8 parts of coupling agent, 20 parts of glass fiber, 12.8 parts of carbon fiber, 0.4 parts of lubricant, 8 parts of polytetrafluoroethylene and 4 parts of low-density polyethylene. The process can perform circulation cooling on the prepared plastic particles to avoid adhesion of the plastic particles.

Description

Technical Field

[0001] The invention belongs to the field of plastic preparation, and in particular relates to a modified plastic preparation process and the modified plastic. Background Art

[0002] Modified plastics are intermediate products in the petrochemical industry chain. They refer to plastic products that are processed on the basis of general plastics and engineering plastics through filling, blending, reinforcement and other methods to improve their flame retardancy, strength, impact resistance, toughness and other properties.

[0003] Before modified plastics are prepared into products, they usually need to be made into plastic granules so that they can be processed into plastic products later. Plastic granules produced using conventional plastic granulation equipment are prone to the phenomenon of connected granules. The reason is that the extruded plastic strips are not cooled properly. Only the surface of the plastic strips is cooled and hardened, while the internal temperature is still high. After cutting, the cross-sections of the plastic particles collide with each other, which makes it easy for the particles to be connected. Summary of the invention

[0004] In view of this, the technical problem to be solved by the present invention is to provide a modified plastic preparation process and modified plastic, which can circulate and cool the prepared plastic particles to avoid adhesion of the plastic particles.

[0005] The present invention provides a process for preparing a modified plastic, comprising the following steps:

[0006] Step 1: Mix and heat the plastic and additive to obtain a modified plastic raw material;

[0007] Step 2: Adding the modified plastic raw material into the preparation device;

[0008] Step 3: Extruding the modified plastic raw material to obtain a plastic strip;

[0009] Step 4: granulating the plastic strips;

[0010] Step 5: Circulating cooling treatment of plastic particles;

[0011] Step 6: Collect and dry the plastic particles.

[0012] The preparation device comprises a water tank, a plurality of inclined baffles are fixedly connected in the water tank, a filter plate is fixedly connected in the water tank, a plurality of rectangular grooves are opened on the filter plate, a baffle is fixedly connected on the filter plate, a conveying screw is rotatably connected in the water tank, and a plurality of cutters are fixedly connected at the lower end of the conveying screw.

[0013] A conveying roller is rotatably connected inside the water tank, a first motor is fixedly connected outside the water tank, and the conveying roller is fixedly connected to the output shaft of the first motor.

[0014] The water tank is fixedly connected with an extrusion cylinder, a pressure plug is slidably connected in the extrusion cylinder, a discharge pipe is fixedly connected at the lower end of the pressure plug, a discharge head is fixedly connected to the discharge pipe, and a plurality of discharge holes are opened on the discharge head.

[0015] A mixing cylinder is fixedly connected to the water tank, a connecting pipe is fixedly connected between the mixing cylinder and the extrusion cylinder, and a one-way valve is fixedly connected inside the connecting pipe and the discharge pipe.

[0016] A rotating shaft is rotatably connected in the mixing barrel, a stirring paddle is slidably connected to the rotating shaft, a convex ridge for limiting the rotation of the stirring paddle is arranged on the rotating shaft, an elastic component is connected between the stirring paddle and the rotating shaft, and the stirring paddle contacts the inner wall of the mixing barrel.

[0017] The modified plastic comprises the following raw materials in parts by weight: 30 parts of polypropylene, 24 parts of polyvinyl chloride, 0.8 parts of coupling agent, 20 parts of glass fiber, 12.8 parts of carbon fiber, 0.4 parts of lubricant, 8 parts of polytetrafluoroethylene and 4 parts of low-density polyethylene. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0019] Figure 1 The present invention is a flow chart of a modified plastic preparation process;

[0020] Figure 2 and Figure 3 It is a schematic diagram of the overall structure of the preparation device;

[0021] Figure 4 It is the structural diagram of the water tank;

[0022] Figure 5 It is a structural cross-sectional view of the water tank;

[0023] Figure 6 It is a schematic diagram of the structure of the conveying screw;

[0024] Figure 7 It is a structural cross-sectional view of the extrusion cylinder;

[0025] Figure 8 It is the structural diagram of the lead screw;

[0026] Fig. 9 It is a schematic diagram of the structure of the stirring paddle;

[0027] Fig.10 Schematic diagram of the structure of the contact plate. DETAILED DESCRIPTION

[0028] The present invention is described in detail with reference to the accompanying drawings in the embodiments of the present invention.

[0029] A modified plastic preparation process comprises the following steps:

[0030] Step 1: Mix and heat the plastic and additive to obtain a modified plastic raw material;

[0031] Step 2: Adding the modified plastic raw material into the preparation device;

[0032] Step 3: Extruding the modified plastic raw material to obtain a plastic strip;

[0033] Step 4: granulating the plastic strips;

[0034] Step 5: Circulating cooling treatment of plastic particles;

[0035] Step 6: Collect and dry the plastic particles.

[0036] See also Figure 4-5 , shows a schematic diagram of an embodiment of the present invention in which the prepared plastic particles can be cyclically cooled to avoid adhesion of the plastic particles, and further,

[0037] The preparation device includes a water tank 101, in which a plurality of inclined baffles 102 are fixedly connected by bolts, a filter plate 103 is fixedly connected by bolts, a plurality of rectangular grooves 104 are opened on the filter plate 103, a baffle 105 is welded and fixedly connected to the filter plate 103, a conveying screw 106 is rotatably connected to the water tank 101 through a bearing, and a plurality of cutters 107 are fixedly connected to the lower end of the conveying screw 106 by bolts.

[0038] First, cold water is injected into the water tank 101, and then the staff passes the extruded plastic strips into the water tank 101. Multiple plastic strips are conveyed downward along the inclined surface in the water tank 101. Multiple inclined baffles 102 are used to separate the plastic strips, thereby preventing the plastic strips from sticking together. When the multiple plastic strips are conveyed to the gap between the filter plate 103 and the water tank 101, the staff controls the conveying screw 106 to rotate, and the conveying screw 106 drives the multiple cutters 107 to rotate, thereby being able to cut and granulate the multiple plastic strips. The filter plate 103 and the water tank 101 cooperate to limit the multiple plastic strips, thereby preventing the multiple cutters 107 from rotating to cut the plastic strips, causing the plastic strips to swing randomly and failing to achieve the cutting function. The manufactured plastic particles float in the water, which has the effect of cooling the plastic particles, thereby avoiding the phenomenon of adhesion. When the cutter 107 rotates, it can accelerate the movement of the plastic particles in the water, further avoiding adhesion between the plastic particles.

[0039] When the conveying screw 106 rotates, it cooperates with the water tank 101 to convey the prepared plastic particles together with the water upward. Since the height of the baffle 105 is lower than the height of the water tank 101, the plastic particles and water can be discharged between the filter plate 103 and the baffle 105. Since a plurality of rectangular grooves 104 are provided on the filter plate 103, water can pass through the filter plate 103 and generate a circulation effect through the conveying screw 106, so that the water in the water tank 101 can be recycled, thereby achieving the effect of circulating cooling of the plastic particles, and the plastic particles are collected between the filter plate 103 and the baffle 105. Finally, by removing the bolts on the filter plate 103, the filter plate 103 and the baffle 105 can be pulled out, thereby achieving the purpose of taking out the plastic particles.

[0040] See also Figure 4 , showing a schematic diagram of an embodiment of the present invention that can play a role in conveying plastic strips, further,

[0041] A conveying roller 108 is rotatably connected to the water tank 101 via a bearing, and a first motor 109 is fixedly connected to the outside of the water tank 101 via bolts. The conveying roller 108 is fixedly connected to the output shaft of the first motor 109 via a coupling.

[0042] The first motor 109 can be started to drive the conveying roller 108 to rotate. When the conveying roller 108 rotates, friction is generated between the conveying roller 108 and the plastic strip, thereby playing a role in conveying the plastic strip and preventing the plastic strip from being stuck in the water tank 101.

[0043] See also Figure 6-7 , showing a schematic diagram of an embodiment of the present invention in which a modified plastic raw material can be made into a plastic strip, further,

[0044] An extrusion cylinder 201 is fixedly connected to the water tank 101 by bolts. The extrusion cylinder 201 is an internal hollow structure. A pressure plug 202 is slidably connected inside the extrusion cylinder 201. A discharge pipe 203 is welded and fixedly connected to the lower end of the pressure plug 202. A discharge head 204 is fixedly connected to the discharge pipe 203 by bolts. The discharge head 204 is provided with multiple discharge holes.

[0045] The staff mixes the modified plastic raw material with the additives, heats them to a liquid state, and then adds them into the extrusion barrel 201. By controlling the plunger 202 to slide downward, pressure is generated inside the extrusion barrel 201, so that the plastic raw material is extruded through the discharge head 204. Multiple discharge holes can discharge the plastic raw material in the form of strips, and the prepared plastic strips can be automatically discharged into the water tank 101 for cooling.

[0046] See also Figure 6-7 , shows a schematic diagram of an embodiment of the present invention capable of extracting plastic raw materials into the extrusion cylinder 201, and further,

[0047] The mixing cylinder 301 is fixedly connected to the water tank 101 by bolts, a connecting pipe 205 is fixedly connected between the mixing cylinder 301 and the extrusion cylinder 201 by welding, and a one-way valve is fixedly connected inside the connecting pipe 205 and the discharge pipe 203 by bolts.

[0048] The mixing barrel 301 is used to store mixed plastic raw materials. When there is a lack of plastic raw materials in the extrusion barrel 201, the plunger 202 slides upward, and the one-way valve in the connecting pipe 205 opens, and the one-way valve in the discharge pipe 203 closes, so that the extrusion barrel 201 can extract the plastic raw materials in the mixing barrel 301 through the connecting pipe 205. When preparing plastic strips, the plunger 202 slides downward, and the one-way valve in the connecting pipe 205 closes, and the one-way valve in the discharge pipe 203 opens, so that the plastic raw materials in the extrusion barrel 201 can be extruded through the discharge pipe 203.

[0049] See also Figure 9-10 , showing a schematic diagram of an embodiment of the present invention in which a plastic raw material can be stirred, further,

[0050] A rotating shaft 401 is rotatably connected to the mixing barrel 301 through a bearing, and a stirring paddle 402 is slidably connected to the rotating shaft 401. A convex ridge for limiting the rotation of the stirring paddle 402 is provided on the rotating shaft 401. An elastic component is connected between the stirring paddle 402 and the rotating shaft 401, and the stirring paddle 402 contacts the inner wall of the mixing barrel 301.

[0051] The staff adds the plastic raw materials into the mixing barrel 301, and then drives the stirring paddle 402 to rotate by controlling the rotating shaft 401, thereby stirring the plastic raw materials and fully mixing the various plastic raw materials, so that the prepared modified plastic particles have consistent performance. Since the stirring paddle 402 is in contact with the inner wall of the mixing barrel 301, the stirring paddle 402 can continuously scratch the inner wall of the mixing barrel 301 when rotating, thereby preventing the plastic raw materials from adhering to the inner wall of the mixing barrel 301, which will cause difficulty in cleaning after long-term accumulation.

[0052] See also Figure 9-10 , showing a schematic diagram of an embodiment of the present invention capable of controlling the effect of the stirring paddle 402 moving up and down, further,

[0053] The elastic component includes a spring 404, the upper end of the spring 404 is welded and fixedly connected to the rotating shaft 401, the upper end of the stirring paddle 402 is fixedly connected to the contact plate 403 by bolts, a plurality of protrusions are provided on the contact plate 403, and the plurality of protrusions are integrally formed with the contact plate 403, the contact plate 403 is welded and fixedly connected to the lower end of the spring 404, a contact rod 405 is fixedly connected to the mixing barrel 301 by bolts, and the conveying screw 106 is fixedly connected to the lower end of the rotating shaft 401.

[0054] When the rotating shaft 401 rotates, the rotating shaft 401 also drives the stirring paddle 402 to rotate, and the stirring paddle 402 drives the contact plate 403 to rotate. The multiple protrusions on the contact plate 403 can continuously come into contact with the contact rod 405, and cooperate with the elastic effect of the spring 404, so that the stirring paddle 402 can continue to slide up and down on the rotating shaft 401. The stirring paddle 402 moves up and down when rotating, which can enhance the stirring effect on the plastic raw material and further improve the uniformity of the plastic raw material.

[0055] See also Figure 8 , shows a schematic diagram of an embodiment of the present invention capable of controlling the rotation of the rotating shaft 401, further,

[0056] The mixing barrel 301 is rotatably connected to a lead screw 302 via a bearing, and the rotating shaft 401 is fixedly connected to the lower end of the lead screw 302 via bolts.

[0057] The rotation of the lead screw 302 is controlled to drive the rotating shaft 401 to rotate.

[0058] See also Figure 2-10 , showing the intention of the embodiment according to the present invention that can drive the lead screw 302 to rotate, further,

[0059] The mixing barrel 301 is fixedly connected to the second motor 304 by bolts, the lead screw 302 is fixedly connected to the output shaft of the second motor 304 by a coupling, the lead screw 302 is threadedly connected to the lifting sleeve 303, and the pressure plug 202 is fixedly connected to the lifting sleeve 303 by bolts.

[0060] Start the second motor 304, and control the second motor 304 to drive the screw 302 to rotate. Controlling the screw 302 to rotate forward and reverse can respectively drive the lifting sleeve 303 to move up and down, thereby driving the plunger 202 to slide up and down, thereby realizing the function of extracting or squeezing the plastic raw material. At the same time, the reciprocating rotation of the stirring paddle 402 can improve the stirring effect.

[0061] When the lead screw 302 drives the conveying screw 106 to reverse, the conveying screw 106 starts to convey the plastic particles downward, and can prevent the plastic particles from naturally sinking and getting stuck in the gap between the conveying screw 106 and the mixing barrel 301 after the conveying screw 106 stops rotating.

[0062] The modified plastic comprises the following raw materials in parts by weight: 30 parts of polypropylene, 24 parts of polyvinyl chloride, 0.8 parts of coupling agent, 20 parts of glass fiber, 12.8 parts of carbon fiber, 0.4 parts of lubricant, 8 parts of polytetrafluoroethylene and 4 parts of low-density polyethylene.

Claims

1. A process for preparing modified plastics, characterized in that: The following steps are involved: Step 1: Mix and heat the plastic and additive to obtain a modified plastic raw material; Step 2: Adding the modified plastic raw material into the preparation device; Step 3: Extruding the modified plastic raw material to obtain plastic strips; Step 4: granulating the plastic strips; Step 5: Circulating cooling treatment of plastic particles; Step 6: Collect and dry the plastic particles; The preparation device comprises a water tank (101), a plurality of inclined baffles (102) are fixedly connected in the water tank (101), a filter plate (103) is fixedly connected in the water tank (101), a plurality of rectangular grooves (104) are formed on the filter plate (103), a baffle (105) is fixedly connected to the filter plate (103), a conveying screw (106) is rotatably connected in the water tank (101), and a plurality of cutters (107) are fixedly connected at the lower end of the conveying screw (106); a conveying roller (108) is rotatably connected in the water tank (101), a first motor (109) is fixedly connected outside the water tank (101), and the conveying roller (108) The water tank (101) is fixedly connected to the output shaft of the first motor (109); an extrusion cylinder (201) is fixedly connected to the water tank (101); a pressure plug (202) is slidably connected inside the extrusion cylinder (201); a discharge pipe (203) is fixedly connected to the lower end of the pressure plug (202); a discharge head (204) is fixedly connected to the discharge pipe (203); a plurality of discharge holes are provided on the discharge head (204); a mixing cylinder (301) is fixedly connected to the water tank (101); a connecting pipe (205) is fixedly connected between the mixing cylinder (301) and the extrusion cylinder (201); the connecting pipe (205) is fixedly connected to the discharge pipe (203); A one-way valve is provided; a rotating shaft (401) is rotatably connected inside the mixing barrel (301); a stirring paddle (402) is slidably connected to the rotating shaft (401); a convex ridge for limiting the rotation of the stirring paddle (402) is provided on the rotating shaft (401); an elastic component is connected between the stirring paddle (402) and the rotating shaft (401); the stirring paddle (402) contacts the inner wall of the mixing barrel (301); the elastic component comprises a spring (404); the upper end of the spring (404) is fixedly connected to the rotating shaft (401); the upper end of the stirring paddle (402) is fixedly connected to a contact plate (403); a plurality of protrusions are provided on the contact plate (403); The contact plate (403) is fixedly connected to the lower end of the spring (404); the mixing barrel (301) is fixedly connected to a contact rod (405); the conveying screw (106) is fixedly connected to the lower end of the rotating shaft (401); the mixing barrel (301) is rotatably connected to a lead screw (302); the rotating shaft (401) is fixedly connected to the lower end of the lead screw (302); the mixing barrel (301) is fixedly connected to a second motor (304); the lead screw (302) is fixedly connected to an output shaft of the second motor (304); a lifting sleeve (303) is threadedly connected to the lead screw (302); and the pressure plug (202) is fixedly connected to the lifting sleeve (303).

2. The modified plastic prepared by the modified plastic preparation process according to claim 1, characterized in that: The modified plastic comprises the following raw materials in parts by weight: 30 parts of polypropylene, 24 parts of polyvinyl chloride, 0.8 parts of coupling agent, 20 parts of glass fiber, 12.8 parts of carbon fiber, 0.4 parts of lubricant, 8 parts of polytetrafluoroethylene and 4 parts of low-density polyethylene.

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