CN102093599A - A high-performance magnetic rubber composition and its electromagnetic shielding gasket - Google Patents

Abstract

The invention discloses a high-performance magnetic rubber composition which is characterized by comprising the following raw materials in parts by weight: 40-60% of diene rubber, 30-50% of magnetic filling powder, 3-5% of an active agent, 0.8-1.2% of a vulcanizing agent, 0.7-2.0% of a vulcanization accelerator and 1-3% of a plasticizer. The invention also discloses a preparation method of the composition, which comprises the following steps: putting rubber into an open mill for mixing uniformly; (2) sequentially adding magnetic filling powder, an active agent and a softening plasticizer into the rubber subjected to uniform banburying, uniformly mixing, discharging rubber, and cooling; (3) and (3) recycling the cooled rubber mixture, then adding a vulcanizing agent and a vulcanization accelerator, vulcanizing, discharging and drying to obtain the high-performance magnetic rubber composition. The invention also discloses an electromagnetic shielding gasket prepared by the electromagnetic shielding gasket. The high-performance magnetic rubber composition provided by the invention has good performance, the method is simple and convenient, and the product has better applicability.

Description

A high-performance magnetic rubber composition and its electromagnetic shielding gasket

technical field

The invention relates to a rubber material and a product, in particular to a high-performance magnetic rubber composition, a preparation method and an electromagnetic shielding gasket prepared therefrom. the

Background technique

In the prior art, the materials used to prepare gaskets are generally plastic or rubber, but the plastic is relatively hard, the anti-bumper performance is not good, and the plastic wear resistance is poor; and the performance of the existing rubber materials cannot be directly adapted to the manufacturing requirements. Electromagnetic shielding gaskets for precision small electrical appliances and instruments with good strength, insulation, wear resistance, anti-aging, electromagnetic shielding and other properties. the

General small electrical appliances and instruments are connected together by many bolts, screws and other fasteners, which retain a lot of through holes, and these through holes often generate relatively large high-frequency electromagnetic leakage. At the same time, since the vibration of electrical appliances or instruments during installation and movement will affect their performance, in order to absorb shocks, rubber or plastic shock-absorbing pads are generally installed on the fasteners. The parts of these shock-absorbing pads in contact with the surface of the equipment They are all solid structures. The solid structure has high rigidity, small vibration frequency and amplitude, and cannot balance the vibration displacement of small electrical appliances and equipment during the moving process, resulting in relative sliding of its internal components. The number of times is too high, the performance is reduced, and its service life is affected. . the

However, the coefficient of friction between the existing gasket or sleeve and the surface of the equipment is large, and the resistance of the electrical appliances and equipment is relatively large during the installation process, and it is often difficult to move along the contact surface, but will increase the vibration amplitude during the movement process. Therefore, how to reduce The friction between the small gasket and the surface of the equipment has also become a technical problem that needs to be solved. the

Contents of the invention

The technical problem to be solved by the present invention is to provide a high-performance magnetic rubber composition with wear resistance, aging resistance, high electromagnetic shielding and high compressibility, its preparation method and the electromagnetic shielding compound prepared from the high-performance magnetic rubber composition. Gasket, the electromagnetic shielding gasket is suitable for electromagnetic shielding gaskets of small electrical appliances and instruments, which can effectively reduce the vibration amplitude and electromagnetic leakage of the connected small electrical appliances and instruments during installation, movement and use, and The utility model has the advantages of convenient installation and use, and simple manufacturing process. the

A high-performance magnetic rubber composition, which comprises the following raw materials in parts by weight: 40-60% of diene rubber, 30-50% of magnetic filler powder, 3-5% of active agent, 0.8-1.2% of vulcanizing agent, vulcanization Accelerator 0.7-2.0% and plasticizer 1-3%. the

The aforementioned high-performance magnetic rubber composition comprises the following raw materials in parts by weight: 45-55% of diene rubber, 35-45% of magnetic filler powder, 3.5-4.5% of active agent, 0.9-1.1% of vulcanizing agent, vulcanization Accelerator 0.8-1.5% and plasticizer 2-3%. the

The aforementioned high-performance magnetic rubber composition comprises the following raw materials in parts by weight: 47% of diene rubber, 45% of magnetic filler powder, 4.1% of active agent, 1.1% of vulcanizing agent, 0.8% of vulcanization accelerator and plasticizer 2 %. the

The diene rubber is natural rubber and styrene-butadiene rubber, which constitute a soft rubber material; or natural rubber and high-styrene rubber, which constitute a hard rubber material. the

The magnetic filling powder is superfine nickel-cadmium aluminum/nickel-graphite composite powder, wherein the weight percentage of each component is Ni: 60-80%, Cr: 10-15%, Al: 5-10%, and C is the balance amount; the active agent is one of zinc oxide, stearic acid or A accelerator or any combination thereof; the vulcanization accelerator is one of DM, D, TT, CZ, TT or ACP-300 or its Any combination; the plasticizer is naphthenic oil. the

A kind of preparation method of described high-performance magnetic rubber composition, it comprises the steps:

(1) Put the rubber into the open mixer and mix evenly;

(2) Add magnetic filling powder, active agent and softening plasticizer in sequence to the evenly mixed rubber, discharge the rubber after mixing evenly, and cool;

(3) Refining the cooled rubber mixture, adding a vulcanizing agent and a vulcanization accelerator, vulcanizing, sheeting, and drying to obtain a high-performance magnetic rubber composition. the

An electromagnetic shielding gasket prepared from the high-performance magnetic rubber composition is characterized in that it is prepared from the high-performance magnetic rubber composition material, and the composition includes the following raw materials in parts by weight: diene rubber 40-60%, magnetic filling powder 30-50%, active agent 3-5%, vulcanizing agent 0.8-1.2%, vulcanization accelerator 0.7-2.0% and plasticizer 1-3%; it includes a rubber body and setting An adhesive layer on its upper surface, and the bottom of the rubber body has a notch inward; the shape of the notch is cylindrical, and its inner diameter is 1/4 to 3/4 of the diameter of the lower surface of the rubber body , and its depth is 1/4 to 3/4 of the thickness of the rubber body. the

The rubber body includes a hard rubber layer arranged at the bottom and a soft rubber layer arranged at the top, and the hard rubber layer and the soft rubber layer are bonded together by vulcanization or adhesive; The notch is arranged at the lower part of the soft rubber layer and runs through the hard rubber layer. the

The thickness of the soft rubber layer is 4-8 mm, and the thickness of the hard rubber layer is 1-2 mm. the

The rubber body is in the shape of a truncated cone, and the diameter of the upper surface is larger than the diameter of the lower surface. the

The advantages of the present invention are that the high-performance magnetic rubber composition has good hardness, wear resistance and aging resistance, and its preparation method is simple and easy, and the upper surface of the electromagnetic shielding gasket prepared by using the high-performance magnetic rubber composition The adhesive layer can be easily adhered to the bottom surface of the metal or plastic body, so that it is suitable for different types of material bodies; at the same time, because the rubber layer that constitutes the rubber body has good plastic deformation properties, the air in the notch After being pressed, the right amount is discharged, so that the suction force between the present invention and the contact surface of the support is greater; at the same time, the hard rubber layer that constitutes the rubber body directly contacts the contact surface, and because its surface is smoother, the friction between it and the contact surface The coefficient is small, and the bottom area is also reduced after opening the notch, so the sliding friction between it and the contact surface is small, and the body is easier to move. the

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. the

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of the present invention;

Fig. 2 is the bottom view of Fig. 1;

Fig. 3 is a sectional view of A-A section in Fig. 2 . the

Detailed ways

Embodiment 1: Referring to Table 1, a high-performance magnetic rubber composition comprises the following raw materials in parts by weight: 40-60% of diene rubber, 30-50% of magnetic filler powder, 3-5% of active agent, 0.8-1.2% vulcanizing agent, 0.7-2.0% vulcanization accelerator and 1-3% plasticizer. Wherein, when the diene rubber is natural rubber or high-styrene rubber, it constitutes a hard high-performance magnetic rubber composition. The magnetic filling powder is superfine nickel-cadmium aluminum/nickel-graphite composite powder, wherein the weight percentage of each component is Ni: 60-80%, Cr: 10-15%, Al: 5-10%, and C is the balance amount; ultra-fine standard is that the average diameter of the powder is 50-200 nanometers; the active agent is one of zinc oxide, stearic acid or A accelerator or any combination thereof; the vulcanization accelerator is DM, D , TT, CZ, TT or ACP-300 or any combination thereof; the plasticizer is naphthenic oil. Specifically, refer to the components and weight ratios listed in column 3 of Table 1. the

A preparation method of the foregoing high-performance magnetic rubber composition, which comprises the steps of: (1) putting rubber into an open mill and mixing uniformly; (2) sequentially dropping magnetic filling powder, active (3) Re-mill the cooled rubber mixture, then add vulcanizing agent and vulcanization accelerator, vulcanize, release, and dry to obtain high-performance magnetic rubber combination. the

Specifically, in this example, quantitative amounts of natural rubber (NR) and high styrene rubber (HS/860) were sequentially taken, put into an open mill with a roll pitch adjusted to 0.1 mm wide, and kneaded to knead evenly Put the composite rubber into the banbury mixer, add stearic acid after 2 minutes of banburying, add A additives after 20s, add zinc oxide after another 20s, and put 2/3 of the filler (ultrafine Talc powder and N330 high wear-resistant carbon black) and naphthenic oil accounting for 1/3 of the total amount of added oil, after banburying for 5 minutes, add the remaining 1/3 of the total filler (ultrafine talc powder and N330 high wear-resistant Carbon black) and 2/3 of the total amount of naphthenic oil, after mixing for 5 minutes, discharge the rubber, and then re-mill the rubber material after cooling, add vulcanization accelerators (DM, D, TT) and sulfur, mix evenly and then release the film; Dried to obtain a hard high-performance magnetic rubber composition. the

Set the temperature of the upper mold of the vulcanizer to 180±10°C, the temperature of the lower mold to 170±10°C, the curing time to 60-100s, the oil pressure to 180-200T, and set one exhaust to twice. Then cut and weigh the rubber material according to the discharge length and place it on the mold according to the discharge method. Press the manual/automatic button of the machine to close the mold. The machine will automatically complete the work. After vulcanization is completed, lift the mold manually/automatically and take it out with an air gun product. Remove the burr from the vulcanized product. the

The high-performance magnetic rubber composition prepared by the above method can be baked at 200° C. for 2 hours and still maintain the same structural properties, and has good aging resistance and high temperature performance. the

Prepared by using the aforementioned high-performance magnetic rubber composition material, the composition includes the following raw materials in parts by weight: 40-60% of diene rubber, 30-50% of magnetic filler powder, 3-5% of active agent, and 0.8% of vulcanizing agent. ～1.2%, vulcanization accelerator 0.7～2.0% and plasticizer 1～3%; It includes a rubber body and an adhesive layer arranged on its upper surface, and the bottom of the rubber body has a concave inward mouth; the shape of the notch is cylindrical, its inner diameter is 1/4 to 3/4 of the diameter of the lower surface of the rubber body, and its depth is 1/4 to 3/4 of the thickness of the rubber body. the

Embodiment 2: a kind of high-performance magnetic rubber composition and preparation method provided by the present embodiment, it is basically the same as embodiment 1, and its difference is that, this high-performance magnetic rubber composition comprises the following weight ratio Raw materials: 45-55% of diene rubber, 35-45% of magnetic filling powder, 3.5-4.5% of active agent, 0.9-1.1% of vulcanizing agent, 0.8-1.5% of vulcanization accelerator and 2-3% of plasticizer. When the diene rubber is natural rubber and styrene-butadiene rubber, a soft high-performance magnetic rubber composition is formed. Specifically, refer to the components and weight ratios listed in column 4 of Table 1. the

The difference of its preparation method is that it comprises the following steps: get natural rubber (NR) and styrene-butadiene rubber (SBR) by the ratio shown in table 1 and put into the roller pitch and adjust to 0.1mm wide open mill, mixing, Put the evenly masticated compound rubber into the internal mixer, add stearic acid after 2 minutes of internal mixing, add zinc oxide after 20 seconds, and add fillers (light calcium and N774 carbon black) that account for 2/3 of the total amount added after 20 seconds ) and 1/3 naphthenic oil accounting for the total amount of added oil, and after banburying for 5 minutes, add the remaining 1/3 of the total filler (ultrafine talcum powder and N330 high wear-resistant carbon black) and 2/3 of the total amount Naphthenic oil, after mixing for 5 minutes, discharge the rubber, and then re-mill the rubber material after cooling, add vulcanization accelerator (ACP-300, CZ, TT) and sulfur, mix evenly and then release the film to obtain a soft high-performance magnetic rubber composition. the

The vulcanization process, specifically, is to set the temperature of the upper die of the hot press molding machine at 185±10°C, the temperature of the lower die at 168±10°C, the vulcanization time at 180-280S, and the hydraulic pressure of 100-150T. The gas is set to 5 times, and the secondary exhaust is set to 3 times. Put the hard glue prepared in Example 1 that has been disassembled on the bottom of the mold and press it tightly (to avoid air bubbles and uneven layering), then cut it according to the length of the discharge and weigh the glue of the soft glue layer according to the row The material is placed on the mold, press the manual/automatic button of the machine to close the mold, the machine automatically completes the work, after vulcanization is completed, lift the mold manually/automatically, and take out the product with the air gun. Remove the burr from the vulcanized product, and evenly coat the surface with a rubber surface treatment agent, and then move it to the adhesive machine for adhesive after drying. Put the lower piece of the product backed with glue in the die for punching to make the finished product of the present invention. the

The electromagnetic shielding gasket prepared by the above-mentioned high-performance magnetic rubber composition material provided in this embodiment, see Figure 1 to Figure 3, a kind of hard and soft high-performance magnetic rubber composition material prepared by the above-mentioned embodiment 1 and 2 The manufactured electromagnetic shielding gasket for small electrical appliances such as computer cases and monitors and instruments and equipment includes a truncated rubber body 1 and an adhesive layer 2 arranged on its upper surface, and the rubber body 1 There is a notch 3 at the bottom; the shape of the notch 3 is cylindrical, the inner diameter of the notch 3 is 1/4 to 3/4 of the diameter of the lower surface of the rubber body, and the depth of the notch 3 is 1/4 of the thickness of the rubber body 1 /4 to 3/4; the rubber body 1 includes a hard rubber layer 4 arranged at the bottom, and a soft rubber layer 5 arranged at the top, the hard rubber layer 4 and the soft rubber layer 5 are bonded together by vulcanization; the notch 3 is set on the hard rubber layer 4; the thickness of the soft rubber layer 5 is greater than the thickness of the hard rubber layer 4. Preferably, the thickness of the soft rubber layer is 4-8 mm, and the thickness of the hard rubber layer is 1-2 mm. Specifically, in this embodiment, the thickness of the hard rubber layer 4 is 1.5 mm, and the thickness of the soft rubber layer 5 is 6.5 mm. The entire electromagnetic shielding gasket is in the shape of a truncated cone, the diameter of the upper surface is larger than the diameter of the lower surface, the diameter of the upper surface is 34.5mm, and can be arbitrarily selected from 32.5 to 36.5mm, the diameter of the lower surface is 32.5mm, and the diameter of the notch 3 is 19.5mm , and can be arbitrarily selected from 16.5 to 22.5mm, the depth of the notch 3 is 1/2 of the height of the entire rubber body, and can be arbitrarily selected from 1/3 to 2/3, and the adhesive tape on the upper surface is selected to have Adhesive paper of a certain thickness. In this embodiment, it adopts a truncated circular structure, which can increase the bonding area on the upper surface, increase the bonding force, reduce the friction force between it and the contact surface, and increase the appearance. the

In other embodiments, the rubber body 1 can also be cylindrical; the hard rubber layer 4 and the soft rubber layer 5 can also be bonded together by an adhesive, or the hard rubber layer 4 and the soft rubber layer 5 can be bonded together. The bonding layer arranged between the soft rubber layers 5 is bonded together, and the bonding layer is gummed paper. As an improvement of the present invention, it is also possible to place the hard rubber layer on the upper part of the rubber body and the soft rubber layer on the lower part. the

Embodiment 3: A kind of high-performance magnetic rubber composition, preparation method and electromagnetic shielding gasket prepared thereof provided by this embodiment are basically the same as Embodiment 1 or 2, and the difference is that the high-performance magnetic rubber composition The material comprises the following raw materials in parts by weight, which are the components and weight ratios listed in column 5 of Table 1. the

Embodiment 4: A kind of high-performance magnetic rubber composition, preparation method and electromagnetic shielding gasket prepared thereof provided by this embodiment are basically the same as Embodiment 1 or 2, and the difference is that the high-performance magnetic rubber composition The material comprises the following raw materials in parts by weight, which are the components and weight ratios listed in column 6 of Table 1. the

Example 5: A high-performance magnetic rubber composition, preparation method and electromagnetic shielding gasket prepared by this example are basically the same as those in Example 1 or 2, except that the high-performance magnetic rubber composition The material comprises the following raw materials in parts by weight, which are the components and weight ratios listed in the 7th column of Table 1. the

Embodiment 6: A high-performance magnetic rubber composition provided in this embodiment, its preparation method and the electromagnetic shielding gasket prepared therefrom are basically the same as those in Embodiment 1 or 2, except that the high-performance magnetic rubber composition The material comprises the following raw materials in parts by weight, which are the components and weight ratios listed in the 8th column of Table 1. the

The above-mentioned embodiments of the present invention do not list the components and weight ratios of the high-performance magnetic rubber composition one by one. According to needs, the specific values of each component can be selected arbitrarily within the scope of the present invention. the

As described in the above-mentioned embodiments of the present invention, other high-performance magnetic rubber compositions obtained by using the same or similar components, methods and structures, preparation methods and electromagnetic shielding gaskets prepared therefrom are all within the protection scope of the present invention . the

Table 1 (components and their weight percentages)

Claims (10)

1. A high-performance magnetic rubber composition, characterized in that it comprises the following raw materials in parts by weight: 40-60% of diene rubber, 30-50% of magnetic filler powder, 3-5% of active agent, vulcanizing agent 0.8-1.2%, vulcanization accelerator 0.7-2.0% and plasticizer 1-3%. 2. The high-performance magnetic rubber composition according to claim 1, characterized in that it comprises the following raw materials in parts by weight: 45-55% of diene rubber, 35-45% of magnetic filler powder, 3.5-45% of active agent 4.5%, vulcanizing agent 0.9-1.1%, vulcanization accelerator 0.8-1.5% and plasticizer 2-3%. 3. The high-performance magnetic rubber composition according to claim 1, characterized in that it comprises the following raw materials in parts by weight: 47% of diene rubber, 45% of magnetic filler powder, 4.1% of active agent, 1.1% of vulcanizing agent, Vulcanization accelerator 0.8% and plasticizer 2%. 4. The high-performance magnetic rubber composition according to claim 1, characterized in that: said diene rubber is natural rubber and styrene-butadiene rubber, forming a soft high-performance magnetic rubber composition. 5. The high-performance magnetic rubber composition according to claim 1, characterized in that: said diene rubber is natural rubber and high-styrene rubber, constituting a hard high-performance magnetic rubber composition. 6. The high-performance magnetic rubber composition according to claim 4 or 5, characterized in that: the magnetic filler powder is ultrafine nickel-cadmium-aluminum/nickel-graphite composite powder, wherein the weight percent of each component is Ni: 60-80%, Cr: 10-15%, Al: 5-10%, and C is the balance; the active agent is one of zinc oxide, stearic acid or A accelerator or any combination thereof; the The vulcanization accelerator is one of DM, D, TT, CZ, TT or ACP-300 or any combination thereof; the plasticizer is naphthenic oil. 7. a method for preparing the high-performance magnetic rubber composition described in one of claims 1-5, is characterized in that, it comprises the steps: (1) Rubber is put into an open mill and mixed evenly; (2) Put magnetic filling powder, activator and softening plasticizer into the rubber which is uniformly mixed in banburying, discharge the rubber after mixing uniformly, and cool; (3) Refining the cooled rubber mixture, adding a vulcanizing agent and a vulcanization accelerator, vulcanizing, sheeting, and drying to obtain a high-performance magnetic rubber composition. 8. An electromagnetic shielding gasket prepared by the high-performance magnetic rubber composition according to claim 1, characterized in that, it is prepared by using the high-performance magnetic rubber composition material, and the composition comprises the following parts by weight Raw materials: 40-60% of diene rubber, 30-50% of magnetic filling powder, 3-5% of active agent, 0.8-1.2% of vulcanizing agent, 0.7-2.0% of vulcanization accelerator and 1-3% of plasticizer; It includes a rubber body and an adhesive layer arranged on its upper surface, and the bottom of the rubber body has a notch inward; the shape of the notch is cylindrical, and its inner diameter is 1 of the diameter of the lower surface of the rubber body /4 to 3/4, and its depth is 1/4 to 3/4 of the thickness of the rubber body. 9. The electromagnetic shielding gasket according to claim 8, characterized in that: the rubber body includes a hard rubber layer arranged at its lower part, and a soft rubber layer arranged at its upper part, the hard rubber layer The rubber layer and the soft rubber layer are bonded together by vulcanization or adhesive; the notch is arranged at the lower part of the soft rubber layer and runs through the hard rubber layer. 10. The electromagnetic shielding gasket according to claim 9, characterized in that: the thickness of the soft rubber layer is 4-8 mm, and the thickness of the hard rubber layer is 1-2 mm.

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