Ethylene-propylene-diene monomer rubber for laser engraving, preparation equipment and preparation method of ethylene-propylene-diene monomer rubber

Abstract

The invention discloses an ethylene propylene diene monomer for laser engraving, a preparation device and a method thereof, and relates to the technical field of rubber.The ethylene propylene diene monomer for laser engraving comprises, by mass, 100 parts of ethylene propylene diene monomer; 20 to 60 parts of fumed silica; 3-5 parts of carbon black; 10 to 30 parts of aluminum hydroxide; 10 to 15 parts of paraffin oil; 2-5 parts of an anti-aging agent; 8-15 parts of zinc oxide; 0.5 to 2 parts of stearic acid; and 5-8 parts of a peroxide vulcanizing agent. Compared with the prior art, the drum-type vulcanized rubber sheet has the advantages of being good in fluidity, capable of meeting the production process of the drum-type vulcanized rubber sheet, low in compression set, high in laser engraving efficiency, clear in engraved pattern, low in engraved surface ashing degree and the like, objects can be conveniently placed, meanwhile, normal work of the internal mixer is prevented from being affected, meanwhile, the internal mixer is conveniently moved, and the working efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of rubber, in particular to ethylene propylene diene monomer rubber for laser engraving, a preparation device and a method thereof. Background Art

[0002] Laser engraving is based on CNC technology and uses laser as the processing medium. The physical transformation of the processing material into instant melting and vaporization under the irradiation of laser engraving can enable laser engraving to achieve the processing purpose. Laser engraving is to use laser technology to write words on objects. The words engraved by this technology have no scratches, the surface of the object is still smooth, and the words will not be worn.

[0003] Using laser ablation technology, rubber offset printing plates can be made by laser engraving. The principle is that during the laser irradiation of the polymer, the radiation energy absorbed by the rubber sheet is converted into heat energy, and the rubber sheet generates heat locally, causing its molecular chain to crack and be ablated to form the desired pattern. 193, 248 or 308nm lasers are often used as light sources for laser engraving. Laser engraving directly etches the set pattern on the rubber plate. In addition to producing some volatile decomposition products during the engraving process, no other pollutants are emitted. Only a ventilation system and an exhaust gas filtration system need to be set up.

[0004] With the rapid development of optoelectronic technology, the application scope of laser engraving technology is becoming more and more extensive, and the requirements for engraving accuracy are becoming higher and higher. The four most fundamental factors affecting laser engraving are: engraving speed, laser power, engraving accuracy, and materials. When using fixed-power laser engraving, the processing speed depends entirely on the rubber formula.

[0005] In the prior art, the quality of rubber prepared by the rubber formula is poor, which affects the engraving efficiency. Therefore, we propose an EPDM rubber for laser engraving, a preparation device and a method thereof to solve the above problems. Summary of the invention

[0006] The object of the present invention is to provide an EPDM rubber for laser engraving, a preparation device and a method thereof, so as to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: an EPDM rubber for laser engraving, wherein the EPDM rubber sheet for laser engraving has the following components in parts by mass: 100 parts of EPDM rubber; 20 to 60 parts of fumed silica; 3 to 5 parts of carbon black; 10 to 30 parts of aluminum hydroxide; 10 to 15 parts of paraffin oil; 2 to 5 parts of antioxidant; 8 to 15 parts of zinc oxide; 0.5 to 2 parts of stearic acid; and 5 to 8 parts of peroxide vulcanizer.

[0008] The raw materials include, by mass: 100 parts of EPDM rubber; 35 parts of fumed silica; 3 parts of carbon black; 20 parts of aluminum hydroxide; 12 parts of paraffin oil; 3.5 parts of antioxidant; 10 parts of zinc oxide; 1 part of stearic acid; and 6 parts of peroxide vulcanizing agent.

[0009] The raw materials include, by mass: 100 parts of EPDM rubber; 40 parts of fumed silica; 3.5 parts of carbon black; 20 parts of aluminum hydroxide; 13 parts of paraffin oil; 3.5 parts of antioxidant; 12 parts of zinc oxide; 1.5 parts of stearic acid; and 6.5 parts of peroxide vulcanizing agent.

[0010] The raw materials include, by mass: 100 parts of EPDM rubber; 45 parts of fumed silica; 3.5 parts of carbon black; 25 parts of aluminum hydroxide; 15 parts of paraffin oil; 3.5 parts of antioxidant; 12 parts of zinc oxide; 1 part of stearic acid; and 6.5 parts of peroxide vulcanizing agent.

[0011] The raw materials include, by mass: 100 parts of EPDM rubber; 50 parts of fumed silica; 4 parts of carbon black; 30 parts of aluminum hydroxide; 15 parts of paraffin oil; 3.5 parts of antioxidant; 12 parts of zinc oxide; 1 part of stearic acid; and 7 parts of peroxide vulcanizing agent.

[0012] The EPDM raw rubber brand is any one of Keltan 2650, KEP240, and EP4045M, the fumed silica is AEROAIL R972, the antioxidant is composed of RD, MB, and ZMTI in proportion, and the peroxide vulcanizing agent is bis(tert-butylperoxide)-p-diisopropylbenzene BIPB.

[0013] A method for preparing EPDM rubber for laser engraving, characterized in that it specifically comprises the following steps:

[0014] S1, the first stage of mixing, ethylene propylene rubber, zinc oxide, stearic acid and antioxidant are put into an internal mixer, mixed for 30 seconds, and then white carbon black, carbon black, aluminum hydroxide and paraffin oil are added, and after mixing, the sheets are produced for standby use;

[0015] 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 the material sufficiently to obtain the EPDM rubber for laser engraving.

[0016] A preparation device for EPDM rubber for laser engraving comprises an internal mixer and a support leg arranged at the bottom of the internal mixer for supporting the internal mixer, a telescopic rod is arranged at the bottom of the internal mixer on one side of the support leg, a support plate is connected to the driving end of the telescopic rod, a roller passes through the support plate, the roller is connected to a rotating shaft for supporting the roller to rotate on the support plate, and a storage basket for placing items is arranged on the support plate.

[0017] The support legs are provided with at least four groups evenly distributed at the bottom corners of the internal mixer, the sum of the minimum length of the telescopic rod and the radius of the roller is smaller than the height of the support legs, and the maximum length of the telescopic rod is greater than the height of the support legs.

[0018] The support plate is provided with a through hole for the roller to rotate, the roller is provided with at least four groups evenly distributed on the support plate, the rotating shaft is arranged on the support plate, and the height of the storage basket is less than the minimum length of the telescopic rod.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. It has good fluidity, meets the production process of drum-type vulcanized rubber sheets, and has the advantages of low compression permanent deformation, high laser engraving efficiency, clear engraving patterns, and low graying degree of engraving surface.

[0021] 2. When the internal mixer needs to be moved, the telescopic rod is driven to extend and push the support plate downward. The support plate moves through the rotating shaft to make the roller follow and move downward. After the roller moves and touches the ground, the ground supports the roller and restricts the roller from moving further downward. The telescopic rod continues to extend to push the internal mixer upward, and the internal mixer drives the support legs to move. The support legs move and separate from the ground, pushing the internal mixer to move by rolling the rollers to contact the ground. After moving to the appropriate position, the above steps are reversed to make the support legs contact the ground and the rollers separate from the ground. Then the materials are added to the internal mixer for processing. The materials or other items can be placed in the storage basket to facilitate the placement of items and avoid affecting the normal operation of the internal mixer. At the same time, it is convenient to move the internal mixer and improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the present invention.

[0023] In the figure: 1. internal mixer; 2. support legs; 3. telescopic rod; 4. support plate; 5. roller; 6. rotating shaft; 7. storage basket. 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] The invention discloses an EPDM rubber for laser engraving. The EPDM rubber sheet for laser engraving has the following components in parts by mass: 100 parts of EPDM rubber; 20-60 parts of fumed silica; 3-5 parts of carbon black; 10-30 parts of aluminum hydroxide; 10-15 parts of paraffin oil; 2-5 parts of antioxidant; 8-15 parts of zinc oxide; 0.5-2 parts of stearic acid; and 5-8 parts of peroxide vulcanizing agent.

[0026] The raw rubber brand of EPDM is any one of Keltan 2650, KEP240 and EP4045M, the fumed silica is AEROAIL R972, the antioxidant is composed of RD, MB and ZMTI in proportion, and the peroxide curing agent is bis(tert-butylperoxide)-p-diisopropylbenzene BIPB.

[0027] Example 1

[0028] The raw materials include, by mass: 100 parts of EPDM rubber; 35 parts of fumed silica; 3 parts of carbon black; 20 parts of aluminum hydroxide; 12 parts of paraffin oil; 3.5 parts of antioxidant; 10 parts of zinc oxide; 1 part of stearic acid; 6 parts of peroxide curing agent;

[0029] The raw rubber brand of EPDM is any one of Keltan 2650, KEP240 and EP4045M, the fumed silica is AEROAIL R972, the antioxidant is composed of RD, MB and ZMTI in proportion, and the peroxide curing agent is bis(tert-butylperoxide)-p-diisopropylbenzene BIPB.

[0030] Example 2

[0031] The raw materials include, by mass: 100 parts of EPDM rubber; 40 parts of fumed silica; 3.5 parts of carbon black; 20 parts of aluminum hydroxide; 13 parts of paraffin oil; 3.5 parts of antioxidant; 12 parts of zinc oxide; 1.5 parts of stearic acid; 6.5 parts of peroxide curing agent;

[0032] The raw rubber brand of EPDM is any one of Keltan 2650, KEP240 and EP4045M, the fumed silica is AEROAIL R972, the antioxidant is composed of RD, MB and ZMTI in proportion, and the peroxide curing agent is bis(tert-butylperoxide)-p-diisopropylbenzene BIPB.

[0033] Example 3

[0034] The raw materials include, by mass: 100 parts of EPDM rubber; 45 parts of fumed silica; 3.5 parts of carbon black; 25 parts of aluminum hydroxide; 15 parts of paraffin oil; 3.5 parts of antioxidant; 12 parts of zinc oxide; 1 part of stearic acid; 6.5 parts of peroxide curing agent;

[0035] The raw rubber brand of EPDM is any one of Keltan 2650, KEP240 and EP4045M, the fumed silica is AEROAIL R972, the antioxidant is composed of RD, MB and ZMTI in proportion, and the peroxide curing agent is bis(tert-butylperoxide)-p-diisopropylbenzene BIPB.

[0036] Example 4

[0037] The raw materials include, by mass: 100 parts of EPDM rubber; 50 parts of fumed silica; 4 parts of carbon black; 30 parts of aluminum hydroxide; 15 parts of paraffin oil; 3.5 parts of antioxidant; 12 parts of zinc oxide; 1 part of stearic acid; 7 parts of peroxide curing agent;

[0038] The raw rubber brand of EPDM is any one of Keltan 2650, KEP240 and EP4045M, the fumed silica is AEROAIL R972, the antioxidant is composed of RD, MB and ZMTI in proportion, and the peroxide curing agent is bis(tert-butylperoxide)-p-diisopropylbenzene BIPB.

[0039] A method for preparing EPDM rubber for laser engraving, characterized in that it specifically comprises the following steps:

[0040] S1, the first stage of mixing, ethylene propylene rubber, zinc oxide, stearic acid and antioxidant are put into an internal mixer, mixed for 30 seconds, and then white carbon black, carbon black, aluminum hydroxide and paraffin oil are added, and after mixing, the sheets are produced for standby use;

[0041] 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 the material sufficiently to obtain the EPDM rubber for laser engraving.

[0042] Keltan 2650, KEP240, and EP4045M rubbers are selected as the main materials of the rubber compound. Their low Mooney ratio can ensure the high fluidity of the final product and better meet the process of calendering and vulcanizing rubber sheets on a drum vulcanizer. At the same time, their low ethylene content is beneficial to improving the elasticity of the product. Fumed silica is added to the formula to provide the rubber compound with good elasticity and low pressure deformation. Its loose and porous structure can significantly increase the ablation rate of polymers, reduce the laser power required at the same engraving speed, improve the clarity of the engraved pattern, and improve the efficiency of laser engraving. Due to the high viscosity of carbon black and silica, the engraving efficiency of the product is improved. Wax oil is easy to burn, and its dosage should not be too large, otherwise the clarity of the engraved pattern will be reduced due to continued ablation under the laser; aluminum hydroxide will hydrolyze at high temperature, which can reduce the smoke generated during the engraving process and improve the processing environment; at the same time, its loose and porous structure can also improve the efficiency of laser engraving; adding zinc oxide is to utilize its higher thermal conductivity to improve the thermal conductivity of the vulcanized rubber, increase the ablation rate, and further accelerate the efficiency of laser engraving; adding antioxidants and using peroxide vulcanization system can further improve the heat resistance of the rubber and ensure the clarity of the engraved pattern.

[0043] Table 1 shows the components of each ingredient in Examples 1-4

[0044]

[0045] Table 2 shows the mixing time of Examples 1-4.

[0046]

[0047] Table 3 is the test results of physical properties of rubber products of Examples 1-4

[0048]

[0049] From Table 3 and Figure 1 It can be seen that the rubber products of Examples 1 to 4 of the present invention have good fluidity, meet the production process of drum-type vulcanized rubber sheets, and have the advantages of low compression permanent deformation, high laser engraving efficiency, clear engraving patterns, and low graying degree of engraved surface.

[0050] A preparation device for EPDM rubber for laser engraving, comprising an internal mixer 1 and a support leg 2 arranged at the bottom of the internal mixer 1 for supporting the internal mixer 1, a telescopic rod 3 is arranged at the bottom of the internal mixer 1 on one side of the support leg 2, a support plate 4 is connected to a driving end of the telescopic rod 3, a roller 5 is passed through the support plate 4, the roller 5 is connected to a rotating shaft 6 for supporting the roller 5 to rotate on the support plate 4, a storage basket 7 for placing items is arranged on the support plate 4, at least four groups of support legs 2 are arranged evenly distributed at the bottom corners of the internal mixer 1, the size of the support plate 4 is smaller than the size of the space enclosed by the four groups of support legs 2, the sum of the minimum length of the telescopic rod 3 and the radius of the roller 5 is smaller than the height of the support leg 2, the maximum length of the telescopic rod 3 is greater than the height of the support leg 2, a through hole for the roller 5 to rotate is arranged on the support plate 4, at least four groups of rollers 5 are arranged evenly distributed on the support plate 4, the rotating shaft 6 is arranged on the support plate 4, and the height of the storage basket 7 is smaller than the minimum length of the telescopic rod 3

[0051] When it is necessary to move the internal mixer 1, the telescopic rod 3 is driven to extend and push the support plate 4 downward. The support plate 4 moves through the rotating shaft 6 to make the roller 5 move downward with it. After the roller 5 moves and contacts the ground, the ground supports the roller 5 and restricts the roller 5 from continuing to move downward. The telescopic rod 3 continues to extend to push the internal mixer 1 to move upward, and the internal mixer 1 drives the supporting legs 2 to move. The supporting legs 2 move and separate from the ground, pushing the internal mixer 1 to move by rolling and contacting the ground through the rollers 5. After moving to a suitable position, the above steps are reversed to make the supporting legs 2 contact the ground and the rollers 5 separate from the ground. Then the materials are added to the internal mixer 1 for processing, and the materials or other items can be placed in the storage basket 7, which is convenient for placing items and avoids affecting the normal operation of the internal mixer 1. At the same time, it is convenient to move the internal mixer 1, thereby improving work efficiency.

[0052] 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 rubber for laser engraving, characterized in that: The composition of the EPDM rubber sheet for laser engraving is as follows in parts by mass: 100 parts of EPDM rubber; 20-60 parts of fumed silica; 3-5 parts of carbon black; 10-30 parts of aluminum hydroxide; 10-15 parts of paraffin oil; 2-5 parts of antioxidant; 8-15 parts of zinc oxide; 0.5-2 parts of stearic acid; and 5-8 parts of peroxide vulcanizing agent.

2. The EPDM rubber for laser engraving according to claim 1, characterized in that: The raw materials include, by mass: 100 parts of EPDM rubber; 35 parts of fumed silica; 3 parts of carbon black; 20 parts of aluminum hydroxide; 12 parts of paraffin oil; 3.5 parts of antioxidant; 10 parts of zinc oxide; 1 part of stearic acid; and 6 parts of peroxide vulcanizing agent.

3. The EPDM rubber for laser engraving according to claim 1, characterized in that: The raw materials include, by mass: 100 parts of EPDM rubber; 40 parts of fumed silica; 3.5 parts of carbon black; 20 parts of aluminum hydroxide; 13 parts of paraffin oil; 3.5 parts of antioxidant; 12 parts of zinc oxide; 1.5 parts of stearic acid; and 6.5 parts of peroxide vulcanizing agent.

4. The EPDM rubber for laser engraving according to claim 1, characterized in that: The raw materials include, by mass: 100 parts of EPDM rubber; 45 parts of fumed silica; 3.5 parts of carbon black; 25 parts of aluminum hydroxide; 15 parts of paraffin oil; 3.5 parts of antioxidant; 12 parts of zinc oxide; 1 part of stearic acid; and 6.5 parts of peroxide vulcanizing agent.

5. The EPDM rubber for laser engraving according to claim 1, characterized in that: The raw materials include, by mass: 100 parts of EPDM rubber; 50 parts of fumed silica; 4 parts of carbon black; 30 parts of aluminum hydroxide; 15 parts of paraffin oil; 3.5 parts of antioxidant; 12 parts of zinc oxide; 1 part of stearic acid; and 7 parts of peroxide vulcanizing agent.

6. The EPDM rubber for laser engraving according to claim 1, characterized in that: The EPDM raw rubber brand is any one of Keltan 2650, KEP240, and EP4045M, the fumed silica is AEROAILR972, the antioxidant is composed of RD, MB, and ZMTI in proportion, and the peroxide vulcanizing agent is bis(tert-butylperoxide)-p-diisopropylbenzene (BIPB).

7. A method for preparing EPDM rubber for laser engraving according to any one of claims 1 to 5, characterized in that: The specific steps include: S1, the first stage of mixing, ethylene propylene rubber, zinc oxide, stearic acid and antioxidant are put into an internal mixer, mixed for 30 seconds, and then white carbon black, carbon black, aluminum hydroxide and paraffin oil are added, and after mixing, the sheets are produced 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 the material sufficiently to obtain the EPDM rubber for laser engraving.

8. A preparation device for EPDM rubber for laser engraving according to any one of claims 1 to 5, comprising an internal mixer (1) and a support leg (2) arranged at the bottom of the internal mixer (1) for supporting the internal mixer (1), characterized in that: A telescopic rod (3) is provided at the bottom of the internal mixer (1) on one side of the support leg (2); a driving end of the telescopic rod (3) is connected to a support plate (4); a roller (5) passes through the support plate (4); the roller (5) is connected to a rotating shaft (6) for supporting the roller (5) to rotate on the support plate (4); and a storage basket (7) for placing articles is provided on the support plate (4).

9. The preparation device of EPDM rubber for laser engraving according to claim 8, characterized in that: The support legs (2) are provided with at least four groups evenly distributed at the bottom corners of the internal mixer (1); the sum of the minimum length of the telescopic rod (3) and the radius of the roller (5) is less than the height of the support legs (2); and the maximum length of the telescopic rod (3) is greater than the height of the support legs (2).

10. The preparation device of EPDM rubber for laser engraving according to claim 8, characterized in that: The support plate (4) is provided with a through hole for the roller (5) to rotate, the roller (5) is provided with at least four groups evenly distributed on the support plate (4), the rotating shaft (6) is arranged on the support plate (4), and the height of the storage basket (7) is less than the minimum length of the telescopic rod (3).

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