EPDM (Ethylene-Propylene-Diene Monomer) mold cleaning rubber for cleaning vulcanization mold as well as preparation method and preparation equipment thereof

Abstract

The invention discloses EPDM (Ethylene-Propylene-Diene Monomer) mold cleaning rubber for cleaning a vulcanization mold as well as a preparation method and preparation equipment of the EPDM mold cleaning rubber, and relates to the technical field of rubber. 20 to 60 parts of white carbon black; 5 to 15 parts of nano montmorillonite; 10 to 30 parts of triethanolamine; 5 to 10 parts of titanium dioxide; 2-5 parts of an anti-aging agent; 0.5 to 3 parts of oleamide; 3-7 parts of zinc oxide; 0.5 to 2 parts of stearic acid; 5-8 parts of a peroxide vulcanizing agent; the grade of the ethylene propylene diene monomer raw rubber is any one of Keltan 2650, KEP330 and EP4045M, and the nano montmorillonite is distributed in a lamellar orientation manner. The rubber material for the charging cable of the electric vehicle charging pile has excellent wear resistance, voltage resistance, aging resistance and cold resistance, is suitable for being used as the charging cable rubber material of the electric vehicle charging pile, prevents the material from jumping out during charging, improves the use safety, and can be selectively charged to the left side or the right side of a cavity of an internal mixer according to requirements.

Description

Technical Field

[0001] The invention relates to the technical field of rubber, in particular to an EPDM mold cleaning rubber for cleaning a vulcanization mold, a preparation method and a preparation device thereof. Background Art

[0002] During repeated use of rubber vulcanization molds, mold scale will be generated on the mold surface. Mold scale will not only affect the appearance of the product, but also cause the product dimensional accuracy to decrease as the scale layer thickens. Currently, the commonly used mold cleaning methods include polishing, mechanical sandblasting, acid cleaning, alkaline cleaning, dry ice cleaning, ultrasonic cleaning, laser cleaning and electrochemical cleaning.

[0003] In the existing technology, most of them need to raise and lower the temperature and disassemble the mold, which takes a long time to clean and will cause irreversible damage to the mold. For this reason, we propose an EPDM mold cleaning glue for cleaning vulcanized molds, a preparation method and a preparation equipment thereof to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide an EPDM mold cleaning rubber for cleaning vulcanization molds, a preparation method and a preparation device thereof, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: an EPDM mold cleaning rubber for cleaning vulcanization molds, wherein the raw materials thereof include, by weight: 100 parts of ethylene propylene rubber; 20 to 60 parts of white carbon black; 5 to 15 parts of nano-montmorillonite; 10 to 30 parts of triethanolamine; 5 to 10 parts of titanium dioxide; 2 to 5 parts of antioxidant; 0.5 to 3 parts of oleamide; 3 to 7 parts of zinc oxide; 0.5 to 2 parts of stearic acid; and 5 to 8 parts of peroxide vulcanizing agent.

[0006] Furthermore, 100 parts of EPDM rubber; 30 parts of white carbon black; 8 parts of nano-montmorillonite; 20 parts of triethanolamine; 6 parts of titanium dioxide; 3 parts of antioxidant; 1.5 parts of oleamide; 5 parts of zinc oxide; 1 part of stearic acid; and 6 parts of peroxide vulcanizing agent.

[0007] Furthermore, 100 parts of EPDM rubber; 40 parts of white carbon black; 12 parts of nano-montmorillonite; 25 parts of triethanolamine; 8 parts of titanium dioxide; 4 parts of antioxidant; 2 parts of oleamide; 5 parts of zinc oxide; 1.5 parts of stearic acid; and 6.5 parts of peroxide vulcanizing agent.

[0008] Furthermore, 100 parts of EPDM rubber; 40 parts of white carbon black; 12 parts of nano-montmorillonite; 30 parts of triethanolamine; 8 parts of titanium dioxide; 4 parts of antioxidant; 2 parts of oleamide; 6 parts of zinc oxide; 1 part of stearic acid; and 6.5 parts of peroxide vulcanizing agent.

[0009] Furthermore, the raw rubber grade of the EPDM rubber is any one of Keltan 2650, KEP330, and EP4045M, and the nano-montmorillonite is distributed in a lamellar orientation.

[0010] Furthermore, the peroxide curing agent is any one of dicumyl peroxide (DCP), bis(tert-butylperoxy)-p-diisopropylbenzene (BIPB), and 2,5-bis(tert-butyl)-2,5-dimethylhexane (DBPH).

[0011] A method for preparing EPDM mold cleaning glue for cleaning vulcanization molds specifically comprises the following steps:

[0012] S1, the first stage of mixing, put the EPDM rubber into the internal mixer, mix for 30 seconds, then add white carbon black, zinc oxide, stearic acid, antioxidant, triethanolamine, oleamide, mix and produce sheets for standby use;

[0013] S2, the second stage of mixing, adding the vulcanizing agent to the material mixed in the previous stage, mixing for the second time, mixing thoroughly, mixing again after cleaning, dispersing sufficiently and discharging the glue to obtain EPDM mold cleaning glue for cleaning the vulcanization mold.

[0014] A preparation device for EPDM mold cleaning glue for cleaning vulcanization molds, including an internal mixer, the internal mixer is arranged on a base, the internal mixer is provided with a feeding device, the feeding device is used to assist in feeding into the internal mixer, the feeding device includes a silo, the lower end of the silo is connected with a feeding port 1 and a feeding port 2 for connecting to the internal mixer, the silo is rotatably provided with a rotating shaft, and the rotating shaft is connected with a horizontal plate for temporarily storing materials.

[0015] Furthermore, the inner bottom of the silo is a triangular structure, and the feed port 1 and the feed port 2 are used to input the material on the horizontal plate into the internal mixer.

[0016] Furthermore, the rotating shaft is connected to a motor, and the rotating shaft motor is arranged on the outer wall of the silo. The rotating shaft is used to drive the horizontal plate to rotate, and the horizontal plate is a concave-shaped structure.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. It has excellent wear resistance, excellent voltage resistance, good aging resistance and good cold resistance, and is suitable for use as a rubber compound for charging cables of electric vehicle charging piles.

[0019] 2. Pour the material onto the horizontal plate, then cover the silo with a lid, and then drive the motor. The motor drives the shaft to rotate, and the shaft rotates to rotate the horizontal plate to dump the material. The material enters the internal mixer through feed port 1 or feed port 2. Feed materials are added to different positions of the internal mixer through feed port 1 and feed port 2. After covering the lid, add materials to the internal mixer to avoid material jumping out during addition, thereby improving the safety of use. At the same time, it is possible to choose to add materials to the left or right side of the internal mixer cavity according to needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the feeding device in the present invention;

[0022] Figure 3 This is a schematic diagram comparing the appearance of a product before and after mold cleaning using the EPDM mold cleaning rubber for cleaning vulcanization molds of the present invention.

[0023] In the figure: 1. internal mixer; 2. base; 3. feeding device; 31. silo; 32. feeding port 1; 33. feeding port 2; 34. rotating shaft; 35. cross plate. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] An EPDM mold cleaning rubber for cleaning a vulcanization mold, wherein the raw materials include, by weight: 100 parts of ethylene propylene rubber; 20-60 parts of white carbon black; 5-15 parts of nano-montmorillonite; 10-30 parts of triethanolamine; 5-10 parts of titanium dioxide; 2-5 parts of antioxidant; 0.5-3 parts of oleamide; 3-7 parts of zinc oxide; 0.5-2 parts of stearic acid; 5-8 parts of peroxide vulcanizing agent;

[0026] The raw rubber grade of EPDM is any one of Keltan 2650, KEP330 and EP4045M. The nano-montmorillonite is distributed in a lamellar orientation with an interlayer spacing of about 1 nm. The peroxide curing agent is any one of diisopropylbenzene peroxide (DCP), bis(tert-butylperoxide)-p-diisopropylbenzene (BIPB) and 2,5-bis(tert-butyl)-2,5-dimethylhexane (DBPH). Keltan 2650, KEP330 and EP4045M rubber are selected as the main materials of the rubber compound, and the ethylene content and Mooney content are relatively low. The final product is guaranteed to have a relatively high fluidity, and can better clean molds with complex structures. At the same time, EPDM Compared with natural rubber, styrene-butadiene rubber, etc., it has better heat resistance and can meet the online cleaning function of molds with higher vulcanization temperatures; white carbon black is added to the formula to ensure the strength of the rubber, and the rubber is easy to remove after cleaning the mold without remaining in the mold; triethanolamine is used as a cleaning agent in the formula; nano-montmorillonite has a very high specific surface area, which can better absorb the gas generated by cleaning mold scale, avoid corrosion of the mold and protect the health of the operator; oleamide can form a protective film on the mold surface to reduce the degree of mold scale accumulation during subsequent use; adding antioxidants and using a peroxide vulcanization system can further improve the heat resistance of the rubber.

[0027] Example 1

[0028] The raw materials include, by weight: 100 parts of EPDM rubber, 30 parts of white carbon black, 8 parts of nano-montmorillonite, 20 parts of triethanolamine, 6 parts of titanium dioxide, 3 parts of antioxidant, 1.5 parts of oleamide, 5 parts of zinc oxide, 1 part of stearic acid and 6 parts of peroxide vulcanizing agent.

[0029] Example 2

[0030] The raw materials include, by weight: 100 parts of EPDM rubber, 40 parts of white carbon black, 12 parts of nano-montmorillonite, 25 parts of triethanolamine, 8 parts of titanium dioxide, 4 parts of antioxidant, 2 parts of oleamide, 5 parts of zinc oxide, 1.5 parts of stearic acid and 6.5 parts of peroxide vulcanizer.

[0031] Example 3

[0032] The raw materials include, by weight: 100 parts of EPDM rubber, 40 parts of white carbon black, 12 parts of nano-montmorillonite, 30 parts of triethanolamine, 8 parts of titanium dioxide, 4 parts of antioxidant, 2 parts of oleamide, 6 parts of zinc oxide, 1 part of stearic acid and 6.5 parts of peroxide vulcanizing agent.

[0033] A method for preparing EPDM mold cleaning glue for cleaning vulcanization molds, specifically comprising the following steps:

[0034] S1, the first stage of mixing, put the EPDM rubber into the internal mixer, mix for 30 seconds, then add white carbon black, zinc oxide, stearic acid, antioxidant, triethanolamine, oleamide, mix and produce sheets for standby use;

[0035] S2, the second stage of mixing, adding the vulcanizing agent to the material mixed in the previous stage, mixing for the second time, mixing thoroughly, mixing again after cleaning, dispersing sufficiently and discharging the glue to obtain EPDM mold cleaning glue for cleaning the vulcanization mold.

[0036] Mixing in stages and ensuring the mixing temperature can ensure the volatilization of low molecular weight substances and the safety of processing.

[0037] Table 1 shows the names and proportions of the EPDM mold cleaning rubber raw materials in Examples 1 to 3

[0038]

[0039] Table 2 shows the mixing time of Examples 1 to 3.

[0040]

[0041] Table 3 shows the physical property test results of the EPDM mold cleaning adhesives prepared in Examples 1 to 3.

[0042]

[0043] From Table 3 and Figure 3 It can be seen that the EPDM mold cleaning rubber prepared in Examples 1 to 3 of the present invention has the characteristics of good fluidity, high strength, good heat resistance, and good mold cleaning effect, and can meet the needs of online mold cleaning of high-temperature vulcanization molds.

[0044] It has the characteristics of good fluidity, high strength, good heat resistance and good mold cleaning effect, and can meet the needs of online mold cleaning of high-temperature vulcanization molds.

[0045] A preparation device for EPDM mold cleaning glue for cleaning vulcanization molds, including an internal mixer 2, the internal mixer 2 is arranged on a base 1, the internal mixer 2 is provided with a feeding device 3, the feeding device 3 is used to assist in feeding into the internal mixer 2, the feeding device 3 includes a silo 31, the lower end of the silo 31 is connected to a feeding port 1 32 and a feeding port 2 33, the top is used to connect the internal mixer 2 and the silo 31, a rotating shaft 34 is rotatably provided on the silo 31, the rotating shaft 34 is connected to a horizontal plate 35 for temporarily storing materials, the inner bottom of the silo 31 is a triangular structure, the bottom of the feeding port 1 32 and the feeding port 2 33 are respectively connected to the left and right sides of the cavity of the internal mixer 2, and are used to input the materials on the horizontal plate 35 to the left and right sides of the cavity of the internal mixer 2, respectively, the rotating shaft 34 is connected to a motor with a brake, the rotating shaft 34 motor is arranged on the outer wall of the silo 31, the rotating shaft 34 is used to drive the horizontal plate 35 to rotate, and the horizontal plate 35 is a concave structure.

[0046] The material is poured onto the transverse plate 35, and then a lid (not shown in the attached figure) is used to cover the silo 31. Then the motor is driven, and the motor drives the shaft 34 to rotate. The shaft 34 rotates to rotate the transverse plate 35 to dump the material. The material enters the internal mixer 2 through the feed port 1 32 or the feed port 2 33. The material is added to different positions of the internal mixer 2 through the feed port 1 32 and the feed port 2 33. After the lid is closed, the material is added to the internal mixer 2 to avoid the material jumping out during the addition, thereby improving the safety of use. At the same time, the material can be added to the left or right side of the cavity of the internal mixer 2 according to the needs.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An EPDM mold cleaning rubber for cleaning vulcanization molds, characterized in that: The raw materials include, by weight: 100 parts of EPDM rubber; 20-60 parts of white carbon black; 5-15 parts of nano-montmorillonite; 10-30 parts of triethanolamine; 5-10 parts of titanium dioxide; 2-5 parts of antioxidant; 0.5-3 parts of oleamide; 3-7 parts of zinc oxide; 0.5-2 parts of stearic acid; and 5-8 parts of peroxide vulcanizer.

2. The EPDM mold cleaning rubber for cleaning vulcanization molds according to claim 1, characterized in that: The raw materials include, by weight: 100 parts of EPDM rubber, 30 parts of white carbon black, 8 parts of nano-montmorillonite, 20 parts of triethanolamine, 6 parts of titanium dioxide, 3 parts of antioxidant, 1.5 parts of oleamide, 5 parts of zinc oxide, 1 part of stearic acid and 6 parts of peroxide vulcanizing agent.

3. The EPDM mold cleaning rubber for cleaning vulcanization molds according to claim 1, characterized in that: The raw materials include, by weight: 100 parts of EPDM rubber, 40 parts of white carbon black, 12 parts of nano-montmorillonite, 25 parts of triethanolamine, 8 parts of titanium dioxide, 4 parts of antioxidant, 2 parts of oleamide, 5 parts of zinc oxide, 1.5 parts of stearic acid and 6.5 parts of peroxide vulcanizer.

4. The EPDM mold cleaning rubber for cleaning vulcanization molds according to claim 1, characterized in that: The raw materials include, by weight: 100 parts of EPDM rubber, 40 parts of white carbon black, 12 parts of nano-montmorillonite, 30 parts of triethanolamine, 8 parts of titanium dioxide, 4 parts of antioxidant, 2 parts of oleamide, 6 parts of zinc oxide, 1 part of stearic acid and 6.5 parts of peroxide vulcanizing agent.

5. The EPDM mold cleaning rubber for cleaning vulcanization molds according to claims 1-4, characterized in that: The EPDM raw rubber brand is any one of Keltan 2650, KEP330, and EP4045M, and the nano-montmorillonite is distributed in a lamellar orientation.

6. The EPDM mold cleaning rubber for cleaning vulcanization molds according to claims 1-4, characterized in that: The peroxide curing agent is any one of dicumyl peroxide (DCP), bis(tert-butylperoxy)-p-diisopropylbenzene (BIPB), and 2,5-bis(tert-butyl)-2,5-dimethylhexane (DBPH).

7. A method for preparing an EPDM mold cleaning rubber for cleaning a vulcanization mold according to any one of claims 1 to 4, characterized in that: The specific steps include: S1, the first stage of mixing, put the EPDM rubber into the internal mixer, mix for 30 seconds, then add white carbon black, zinc oxide, stearic acid, antioxidant, triethanolamine, oleamide, mix and produce sheets for standby use; S2, the second stage of mixing, adding the vulcanizing agent to the material mixed in the previous stage, mixing for the second time, mixing thoroughly, mixing again after cleaning, and dispersing thoroughly to obtain the EPDM mold cleaning glue for cleaning the vulcanization mold.

8. A preparation device for the EPDM mold cleaning rubber for cleaning vulcanization molds according to any one of claim 7, comprising an internal mixer (2), the internal mixer (2) being arranged on a base (1), characterized in that: The internal mixer (2) is provided with a feeding device (3), and the feeding device (3) is used to assist in feeding materials into the internal mixer (2). The feeding device (3) comprises a silo (31), and the lower end of the silo (31) is connected with a first feeding port (32) and a second feeding port (33) for connecting to the internal mixer (2). The silo (31) is rotatably provided with a rotating shaft (34), and the rotating shaft (34) is connected with a horizontal plate (35) for temporarily storing materials.

9. The preparation equipment of EPDM mold cleaning rubber for cleaning vulcanization molds according to claim 8, characterized in that: The inner bottom of the silo (31) is a triangular structure, and the first feed port (32) and the second feed port (33) are used to feed the material on the transverse plate (35) into the internal mixer (2).

10. The preparation equipment of EPDM mold cleaning rubber for cleaning vulcanization molds according to claim 8, characterized in that: The rotating shaft (34) is connected to a motor, and the rotating shaft (34) motor is arranged on the outer wall of the silo (31). The rotating shaft (34) is used to drive the transverse plate (35) to rotate, and the transverse plate (35) is a concave-shaped structure.

Images