EPP particle surface modification vibration coating device

Abstract

The utility model relates to the technical field of high polymer material preparation, in particular to an EPP (Expanded Polypropylene) particle surface modification vibration coating device which comprises a stirring unit and a vibration mixing unit which are connected, wherein the stirring unit comprises a stirring tank and a heating sleeve arranged on the outer side of the stirring tank; the vibration mixing unit comprises a vibration box and a vibration motor connected with the vibration box; a first discharge hole in the lower part of the stirring tank is connected with a second feed hole in the upper part of the vibration box. According to the EPP particle surface modification vibration coating device provided by the utility model, the stirring unit is matched with the vibration mixing unit, so that the modification of the EPP particle surface is completed under the condition of not additionally introducing a base material, the modification process is simplified, and the modification cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of polymer material preparation, in particular to an EPP particle surface modification vibration coating device. Background Art

[0002] Expanded polypropylene material, abbreviated as EPP, is a new type of foam material that combines strength and environmental protection by lightweighting polypropylene material through foaming technology. Its unique closed bubble structure gives polypropylene foam material certain resilience and processing properties. In particular, the polypropylene foam beads produced by supercritical autoclave foaming technology have a unique bead-like appearance, which makes them have very good fluidity in the downstream molding process. Various special-shaped parts with structural strength can be obtained through mold design. Compared with general XPP, XPE, and foamed polyurethane, EPP material has an increasingly wide application market in industrial design due to its unique properties, and the market is also gradually expanding.

[0003] With the gradual development of the market, the functional requirements of EPP products are gradually increasing, such as the development needs of flame retardant, aging resistance, antistatic, conductive materials and other functions.

[0004] In order to meet the functional requirements of EPP products, it is often necessary to modify the surface of EPP particles. Among them, coating the surface of EPP particles with corresponding organic or inorganic powders is a commonly used modification method. Currently, the modification of EPP particles is usually achieved by introducing a shell layer by mixing the modifying substance with the corresponding substrate such as polypropylene and then coating it on the outside of the EPP particles.

[0005] This modification method requires the introduction of additional substrate, resulting in higher costs. Utility Model Content

[0006] In order to solve the problem in the prior art that an additional substrate needs to be introduced when modifying the surface of EPP particles, the utility model provides an EPP particle surface modification vibration coating device, which completes the modification of the EPP particle surface without the need for an additional substrate, simplifies the modification process, and reduces the modification cost, thereby solving the problem in the prior art that an additional substrate needs to be introduced when modifying the surface of EPP particles.

[0007] The technical solution adopted by the utility model to solve its technical problems is:

[0008] An EPP particle surface modification vibration coating device comprises a connected stirring unit and a vibration mixing unit; wherein,

[0009] The stirring unit includes a stirring tank and a heating jacket arranged outside the stirring tank;

[0010] The vibration mixing unit includes a vibration box and a vibration motor connected to the vibration box;

[0011] The first discharge port below the stirring tank is connected to the second feed port above the vibration box.

[0012] Optionally, a temperature measuring structure is provided in the stirring tank.

[0013] Optionally, the stirring unit further includes an electrostatic generator connected to the stirring tank.

[0014] Optionally, a lining is provided in the vibration box, and the material of the lining is nylon.

[0015] Optionally, a lining heating structure is provided in the vibration box.

[0016] Optionally, a conveying unit is further included that is connected downstream of the vibration mixing unit.

[0017] Optionally, the conveying unit comprises a conveyor belt and a collecting structure connected to each other.

[0018] Optionally, a plurality of grooves are provided on the conveyor belt.

[0019] Optionally, the width of the groove is 0.2-0.5 mm.

[0020] Optionally, the distance between adjacent grooves is 3-5 cm.

[0021] The beneficial effects of the utility model are:

[0022] The EPP particle surface modification vibration coating device provided by the utility model completes the modification of the EPP particle surface without the need for additional introduction of a substrate through the cooperation of a stirring unit and a vibration mixing unit, thereby simplifying the modification process and reducing the modification cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is a schematic structural diagram of the EPP particle surface modification vibration coating device in the present utility model;

[0025] Figure 2 It is a simplified structural diagram of the EPP particle surface modification vibration coating device in the utility model.

[0026] In the figure: 1-stirring unit; 11-stirring tank; 111-first discharge port; 112-temperature measuring structure; 113-first feed port; 12-heating jacket; 2-vibration mixing unit; 21-vibration box; 211-second feed port; 212-third feed port; 213-second discharge port; 22-vibration motor; 3-transmission unit; 31-conveyor belt; 311-groove; 32-collection structure. DETAILED DESCRIPTION

[0027] The present invention will now be described in further detail. The embodiments described below are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort shall fall within the scope of protection of the present invention.

[0028] In the description of this utility model, it should be understood that the terms "first" and "second" are used only to simplify the description and should not be understood to indicate or imply relative importance, or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0029] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" the first feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above," "above," and "above" the second feature includes the first feature being directly above or obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" the second feature includes the first feature being directly below or obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0031] In order to solve the problem that an additional substrate needs to be introduced when modifying the surface of EPP particles in the prior art, the present invention provides an EPP particle surface modification vibration coating device, see Figure 1 、 Figure 2As shown, the device includes a connected stirring unit 1 and a vibration mixing unit 2; wherein the stirring unit 1 is used to store the coating powder, and the coating powder is added to the vibration mixing unit 2 to complete the coating of the EPP particles in the vibration mixing unit 2; specifically, the stirring unit 1 includes a stirring tank 11, and a heating jacket 12 arranged on the outside of the stirring tank 11; the stirring tank 11 is used to store the coating powder. In order to ensure the coating effect, the heating jacket 12 is preferably provided on the outside of the stirring tank 11 so that the coating powder in the stirring tank 11 can be heated by the heating jacket 12. The specific heating temperature depends on the coating powder and the EPP particles to be coated; this application The coating powder is preferably an inorganic powder, and the coating powder is preferably heated to a temperature of 140-150°C, so that when the heated coating powder is mixed with the EPP particles to be coated, the temperature of the coating powder can cause a certain amount of softening and melting on the surface of the polypropylene particles, thereby allowing the coating powder to enter the surface of the particle cortex, so that it can better play a coating role; in order to ensure that the coating powder is heated evenly to improve the uniformity of the coating, the utility model preferably provides a stirring structure (not shown in the figure) in the stirring tank 11, wherein the stirring structure can select the corresponding existing technology according to the performance of the coating powder, for example, the stirring structure in patents such as application numbers 202310048087.9, 201720244115.4, and 202420209206.4 can be selected.

[0032] The vibration mixing unit 2 can use an existing vibration screen or other device; in order to fully mix and coat the coating powder and the EPP particles, the utility model preferably includes a vibration box 21 and a vibration motor 22 connected to the vibration box 21; the EPP particles to be coated are placed in the vibration box 21, and the vibration box 21 is vibrated by the vibration motor 22 to fully mix the coating powder and the EPP particles to achieve coating.

[0033] Specifically, the present invention preferably provides a feed port above the stirring tank 11, which is recorded as the first feed port 113, so that the coating powder can be added to the stirring tank 11 through the first feed port 113; a discharge port is provided below the stirring tank 11, which is recorded as the first discharge port 111, and the first discharge port 111 is communicated with the vibration box 21, so that the coating powder can be transported to the vibration box 21 through the first discharge port 111; the present invention preferably provides a feed port above the vibration box 21, which is recorded as the second feed port 211, and the first discharge port 111 is connected to the second feed port 211 above the vibration box 21, so that the coating powder can be transported to the vibration box 21 through the second feed port 211. In addition, the utility model preferably provides a third feed port 212 on the side of the vibration box 21, through which the EPP particles to be coated are transported to the vibration box 21; a second discharge port 213 is also provided on the side of the vibration box 21 opposite to the third feed port 212, so that the coated EPP particles are output from the second discharge port 213.

[0034] During the operation of the EPP particle surface modification vibration coating device, the coating powder in the stirring tank 11 is heated to a preset temperature by the heating jacket 12, and then the heated coating powder is sprayed onto the EPP particles in the vibration box 21 through the first discharge port 111 and the second feed port 211. At the same time, the vibration box 21 is driven to vibrate by the vibration motor 22. During the vibration process, the coating powder is fully in contact with the EPP particles to complete the coating. At the same time, the coated EPP particles are moved toward the second discharge port 213 by vibration to complete the transmission of the coated EPP particles.

[0035] The EPP particle surface modification vibration coating device provided by the utility model completes the modification of the EPP particle surface without the need for additional introduction of a substrate through the cooperation of a stirring unit 1 and a vibration mixing unit 2, thereby simplifying the modification process and reducing the modification cost.

[0036] The preferred vibration motor 22 of the present invention is a reciprocating motor. The reciprocating motor is used to fully vibrate the box body and provide power for the particles in the box body to move forward.

[0037] In order to facilitate the control of the amount of coating powder, the present invention preferably adopts a pulsed discharge method at the first discharge port 111 of the stirring tank 11 to accurately discharge the powder to prevent the accumulation of powder inside the vibration box 21 and affect the coating efficiency of the particles.

[0038] In order to facilitate temperature control, a temperature measuring structure 112 is preferably provided in the stirring tank 11. The temperature measuring structure 112 may be a box thermometer or a temperature sensor to achieve real-time monitoring of the temperature.

[0039] In addition, with the gradual development of the market, the functional requirements of EPP products are also gradually increasing, especially for conductive materials, which have great application prospects in the fields of electronic packaging, electromagnetic shielding, and wave absorption. According to the surface resistance of the material, conductive materials can be simply divided into high conductive materials (surface resistance <10 4 Ω) and semi-conductive materials (surface resistance between 10 4 Ω-10 9 Ω), highly conductive materials are often used in the field of electromagnetic shielding, which can effectively reduce the scattering of electromagnetic waves in space and achieve the effect of radar "stealth". Semi-conductive materials are often used in the equipment packaging industry. Taking advantage of their low surface resistance, they can quickly disperse the charges generated on the surface of the product, preventing the irreversible damage to the surface of the product caused by concentrated electron discharge.

[0040] Traditional conductive foamed polypropylene beads often achieve the conductive effect by stacking conductive carbon black in the system to create the required conductive pathways. The conductive properties exhibited by different conductive carbon black stacking ratios vary to a certain extent. Although the conductive properties of traditional conductive foamed polypropylene beads are relatively stable, their product color can only be a single black due to the introduction of conductive carbon black, which to some extent limits the application of conductive foamed polypropylene materials.

[0041] Based on this, in order to solve the problem that the conductive foamed polypropylene beads in the prior art are single black in color, the conductive foamed polypropylene beads can be obtained by modifying the EPP surface by introducing conductive inorganic substances.

[0042] Specifically, the conductive inorganic powder can be sprayed onto the vibration box 21 through the stirring tank 11 in the present invention to coat the EPP particles in the vibration box 21; in order to obtain conductive foamed polypropylene particles, the stirring unit 1 of the present invention preferably also includes an electrostatic generator (not shown in the figure) connected to the stirring tank 11, so that the inorganic conductive powder inside can be positively charged by connecting the stirring tank 11 to the high-voltage electrostatic generator, and then the positively charged inorganic conductive powder can be used to coat the EPP particles to obtain conductive polypropylene particles.

[0043] Specifically, the present invention preferably inserts the electrostatic generator into the stirring tank 11 through a contact rod (oblique insertion type), directly contacting the conductive inorganic powder in the stirring tank 11. At the same time, the entire inner wall of the stirring tank 11 is insulated, so that the electrostatic generator generates a strong electric field through a high-voltage power supply and electrodes, so that the conductive inorganic powder is positively charged.

[0044] In order to improve the stability of the coating, the present invention further preferably provides an inner lining in the vibration box 21, and the material of the inner lining is nylon, so that the polypropylene particles can contact and rub with the nylon lining, so that the polypropylene particles are negatively charged, so that when the negatively charged polypropylene particles are mixed with the positively charged electromechanical conductive powder, the coating stability of the product can be better improved.

[0045] In order to improve the coating effect, the utility model preferably provides a lining heating structure in the vibration box 21 to keep the lining at a certain temperature, thereby ensuring that the coating powder can enter the surface of the EPP particle cortex during the coating process, so that it can better play a coating role; the utility model preferably maintains the lining temperature at 120°C during operation.

[0046] Furthermore, the preferred EPP particle surface modification vibration coating device of the present invention also includes a conveying unit 3 connected downstream of the vibration mixing unit 2. Specifically, the second discharge port 213 is preferably connected to the conveying unit 3 to facilitate the conveying of the coated EPP particles through the conveying unit 3.

[0047] The preferred conveying unit 3 of the present invention includes a connected conveyor belt 31 and a collecting structure 32, wherein one end of the conveyor belt 31 is connected to the second discharge port 213, and the other end is connected to the collecting structure 32, so that the coated EPP particles are conveyed to the collecting structure 32 for storage through the conveyor belt 31.

[0048] In order to remove excess powder, the utility model preferably provides a plurality of grooves 311 on the conveyor belt 31 so that the uncoated powder can be screened out during the conveying process.

[0049] In order to ensure the powder screening effect, the present invention preferably has a width of the groove 311 of 0.2-0.5 mm, and further preferably has a distance between adjacent grooves 311 of 3-5 cm.

[0050] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the scope of the technical concept of this utility model. The technical scope of this utility model is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. A vibration coating device for surface modification of EPP particles, characterized in that: It comprises a stirring unit (1) and a vibration mixing unit (2) connected to each other; wherein, The stirring unit (1) comprises a stirring tank (11) and a heating jacket (12) arranged outside the stirring tank (11); The vibration mixing unit (2) comprises a vibration box (21) and a vibration motor (22) connected to the vibration box (21); The first discharge port (111) below the stirring tank (11) is connected to the second feed port (211) above the vibration box (21).

2. The EPP particle surface modification vibration coating device according to claim 1, characterized in that: A temperature measuring structure (112) is provided in the stirring tank (11).

3. The EPP particle surface modification vibration coating device according to claim 1, characterized in that: The stirring unit (1) further comprises an electrostatic generator connected to the stirring tank (11).

4. The EPP particle surface modification vibration coating device according to claim 1, characterized in that: The vibration box (21) is provided with an inner lining, and the material of the inner lining is nylon.

5. The EPP particle surface modification vibration coating device according to claim 4, characterized in that: A lining heating structure is provided in the vibration box (21).

6. The EPP particle surface modification vibration coating device according to any one of claims 1 to 5, characterized in that: It also includes a transmission unit (3) connected downstream of the vibration mixing unit (2).

7. The EPP particle surface modification vibration coating device according to claim 6, characterized in that: The conveying unit (3) comprises a conveyor belt (31) and a collecting structure (32) connected to each other.

8. The EPP particle surface modification vibration coating device according to claim 7, characterized in that: A plurality of grooves (311) are provided on the conveyor belt (31).

9. The EPP particle surface modification vibration coating device according to claim 8, characterized in that: The width of the groove (311) is 0.2-0.5 mm.

10. The EPP particle surface modification vibration coating device according to claim 9, characterized in that: The distance between adjacent grooves (311) is 3-5 cm.

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