Rubber composition, seal containing rubber composition, adhesive material containing rubber composition, and method for manufacturing processed product of rubber composition

Abstract

To provide a rubber composition having transparency and adhesiveness, with which it becomes possible to carry out vulcanization processing by hydraulic press.SOLUTION: A rubber composition includes a synthetic rubber having transparency, and a plasticizer to be added to the synthetic rubber. The plasticizer is added in an amount of a range of 40-120 pts.wt with respect to 100 pts.wt of the synthetic rubber. The rubber composition has adhesiveness and transparency.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a rubber composition, a stamp containing the rubber composition, an adhesive material containing the rubber composition, and a method for producing a processed product of the rubber composition. [Background technology]

[0002] Conventionally, transparent and adhesive compositions have been known for use in daily necessities, industrial products, etc. Examples of this type of composition include polyvinyl chloride resin (PVC), as shown in Patent Document 1 below. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-217397 Summary of the Invention [Problem to be solved by the invention]

[0004] In the molding of PVC mentioned above, the PVC is generally melted, the molten resin is injected into a mold, and then cooled and molded. Because the molding target is resin, large-scale resin equipment is required. Furthermore, it is thought that there is no room for vulcanization processing using a hydraulic press.

[0005] Another example of the above-mentioned composition is liquid silicone (RTV). When RTV is used, its liquid nature makes it difficult to vulcanize using a hydraulic press. On the other hand, from the perspective of being able to vulcanize using a hydraulic press, the use of Millable low-hardness silicone, Millable transparent silicone, etc. is conceivable. However, Millable low-hardness silicone has adhesive properties, but is milky white and therefore not transparent. Furthermore, Millable transparent silicone has transparency but not adhesive properties. As such, with current technology, there is no product that has transparency and adhesive properties and can be vulcanized using a hydraulic press.

[0006] In view of the above, an object of the present invention is to provide a rubber composition that has transparency and adhesiveness and can be vulcanized using a hydraulic press, a stamp using the rubber composition, an adhesive material using the rubber composition, and a method for producing a processed product of the rubber composition. [Means for solving the problem]

[0007] As a result of extensive research, the inventors of the present invention have found for the first time that the above-mentioned technical problem can be solved by adding a plasticizer to a transparent synthetic rubber and adjusting the proportion of the plasticizer added appropriately. The technical means of the present invention for solving this technical problem is characterized by the following points.

[0008] The rubber composition of the present invention includes a transparent synthetic rubber and a plasticizer added to the synthetic rubber. The plasticizer is added in an amount ranging from 40 to 120 parts by weight per 100 parts by weight of the synthetic rubber. The rubber composition of the present invention is adhesive and transparent.

[0009] In the rubber composition of the present invention, the plasticizer includes one or more compounds selected from dimethyl phthalate (DMP), diethyl phthalate (DEP), dibutyl phthalate (DBP), di-2-ethylhexyl phthalate (DEHP), diisononyl phthalate (DINP), diisodecyl phthalate (DIDP), butyl benzyl phthalate (BBP), dioctyl terephthalate (DOTP), dioctyl adipate (DOA), diisononyl adipate (DINA), dioctyl azelate (DOZ), dioctyl sebacate (DOS), tricresyl phosphate (TCP), acetyl tributyl citrate (ATBC), and trimellittrioctyl (TOTM).

[0010] The stamp of the present invention contains the above-described rubber composition.

[0011] The adhesive material of the present invention contains the above-described rubber composition.

[0012] The method for producing a processed product of the rubber composition of the present invention is a method for producing a processed product by processing the above-mentioned rubber composition, and includes a process of vulcanizing the synthetic rubber to which at least the plasticizer has been added using a hydraulic press.

[0013] In the method for producing a processed product of a rubber composition of the present invention, the processed product is a stamp.

[0014] In the method for producing a processed product of a rubber composition of the present invention, the processed product is an adhesive material. [Effects of the Invention]

[0015] According to the present invention, it is possible to obtain a rubber composition that has transparency and adhesiveness and that can be vulcanized using a hydraulic press. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a perspective view of a rubber composition (millable type compound) according to an embodiment of the present invention. [Figure 2]2 is a perspective view and an enlarged view of a processed product (the seal surface of a stamp) produced by vulcanizing the rubber composition (Millable type compound) shown in FIG. 1 using a hydraulic press. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0018] The rubber composition according to an embodiment of the present invention includes a synthetic rubber and a plasticizer. The synthetic rubber may be any transparent rubber. For example, one or more rubbers selected from the group consisting of isoprene rubber, butadiene rubber, and ethylene propylene rubber may be used as the transparent synthetic rubber.

[0019] The plasticizer described above is a plasticizer added to the synthetic rubber described above. The plasticizer is added in a ratio of 40 to 120 parts by weight per 100 parts by weight of the synthetic rubber. By adding the plasticizer in this ratio, the rubber composition of this embodiment has adhesiveness and transparency.

[0020] The proportion of the plasticizer added may be in the range of 40 parts by weight or more and 120 parts by weight or less, and the range may be selected from, for example, 40 to 50 parts by weight, 50 to 60 parts by weight, 60 to 70 parts by weight, 70 to 80 parts by weight, 80 to 90 parts by weight, 90 to 100 parts by weight, 100 to 110 parts by weight, and 110 to 120 parts by weight.

[0021] The plasticizer in this embodiment may be any plasticizer capable of imparting tackiness to the rubber composition. For example, the plasticizer may include one or more compounds selected from the group consisting of dimethyl phthalate (DMP), diethyl phthalate (DEP), dibutyl phthalate (DBP), di-2-ethylhexyl phthalate (DEHP), diisononyl phthalate (DINP), diisodecyl phthalate (DIDP), butyl benzyl phthalate (BBP), dioctyl terephthalate (DOTP), dioctyl adipate (DOA), diisononyl adipate (DINA), dioctyl azelate (DOZ), dioctyl sebacate (DOS), tricresyl phosphate (TCP), acetyl tributyl citrate (ATBC), and trimellittrioctyl (TOTM).

[0022] In the rubber composition according to the embodiment of the present invention, a filler and / or a crosslinking agent may be added to the synthetic rubber in addition to the plasticizer. The filler may include, for example, one or more compounds selected from dry silica, wet silica, and magnesium carbonate.

[0023] The crosslinking agent may include one or more compounds selected from the group consisting of peroxyketal, dialkyl peroxide, peroxyester, diacyl peroxide, peroxydicarbonate, and hydroperoxide. The proportions of the filler and crosslinking agent added may be adjusted as appropriate depending on the application, performance, ease of processing, etc. of the rubber composition.

[0024] The rubber composition according to the embodiment of the present invention may be in the form of a millable compound, for example. In this case, the synthetic rubber described above is first introduced into a predetermined mixer, such as a rolling mill or an internal mixer, and the mixer is operated for several minutes to allow the synthetic rubber to blend. Next, the plasticizer, filler, and crosslinker, each in the specified proportions, are gradually introduced into the same mixer. After the entire amount has been introduced, the mixer is continued to operate, mixing the synthetic rubber, plasticizer, filler, and crosslinker. Then, upon completion of the mixing, the rubber composition is removed from the mixer. Through this series of processes, the rubber composition can be produced as a millable compound.

[0025] As shown in Fig. 1, the rubber composition 100 produced through the above-described series of processes has transparency and adhesiveness. Furthermore, the rubber composition 100 can maintain a solid shape such as a roughly plate-like shape as a millable compound. The shape, properties, etc. of the millable compound-like rubber composition 100 may be adjusted depending on the processing mode, such as molding.

[0026] Various processed products can be manufactured using the millable compound rubber composition 100 as a raw material. The processed product may have any shape and any use as long as it can be molded by a predetermined molding method. More specifically, the processed product may be, for example, a stamp, an adhesive material, etc. In this case, the stamp and the adhesive material each contain the rubber composition 100.

[0027] The method of processing a rubber composition according to an embodiment of the present invention to manufacture a processed product includes a process of vulcanizing synthetic rubber to which at least a plasticizer has been added using a hydraulic press. Here, the "synthetic rubber to which at least a plasticizer has been added" may be the above-mentioned "Millable-type compound rubber composition 100" itself. The addition of a filler and a crosslinking agent to the "synthetic rubber to which at least a plasticizer has been added" is optional. Other additives may also be added to the "synthetic rubber to which at least a plasticizer has been added."

[0028] More specifically, first, a mold for a hydraulic press is heated, and the above-mentioned "Millable compound rubber composition 100" is poured into the cavity of the mold. The shape of this cavity follows the shape of the workpiece. After pouring, the "Millable compound rubber composition 100" in the cavity is vulcanized using a hydraulic press. Then, the hydraulic press is completed, and the workpiece is removed from the mold. Through this series of processes, a workpiece made from the rubber composition can be manufactured.

[0029] 2, the processed product 200 manufactured through the above-described series of processes has undergone vulcanization, and therefore retains its shape according to the mold and has elasticity. Furthermore, the processed product 200 is made from the millable compound rubber composition 100, and therefore has transparency and adhesiveness.

[0030] 2 is the seal surface of a stamp, in which case the hydraulic press die may be designed to conform to the shape of the seal surface of the stamp. Alternatively, if the workpiece is an adhesive material, the hydraulic press die may be designed to conform to the shape of the adhesive material (for example, a flat plate shape).

[0031] <Effects of the embodiment> As described above, the rubber composition according to the embodiment of the present invention contains a transparent synthetic rubber and a plasticizer added to the synthetic rubber. The plasticizer is added in an amount ranging from 40 to 120 parts by weight per 100 parts by weight of the synthetic rubber. The rubber composition according to the embodiment of the present invention is adhesive and transparent.

[0032] According to the above configuration, a relatively large amount of plasticizer is added to a transparent synthetic rubber. As a result, the rubber composition has adhesiveness in addition to the transparency inherent in the synthetic rubber, and also exhibits a millable compound shape. This millable compound can be vulcanized using a hydraulic press. Therefore, the rubber composition has transparency and adhesiveness, and can be vulcanized using a hydraulic press.

[0033] In the rubber composition according to the embodiment of the present invention, the plasticizer includes one or more compounds selected from dimethyl phthalate (DMP), diethyl phthalate (DEP), dibutyl phthalate (DBP), di-2-ethylhexyl phthalate (DEHP), diisononyl phthalate (DINP), diisodecyl phthalate (DIDP), butyl benzyl phthalate (BBP), dioctyl terephthalate (DOTP), dioctyl adipate (DOA), diisononyl adipate (DINA), dioctyl azelate (DOZ), dioctyl sebacate (DOS), tricresyl phosphate (TCP), acetyl tributyl citrate (ATBC), and trimellittrioctyl (TOTM).

[0034] According to the above configuration, the properties of the rubber composition can be targeted by selecting and using a plasticizer or by blending a plurality of selected plasticizers. Furthermore, a general-purpose compound can be used as the plasticizer. Therefore, a rubber composition having the targeted properties can be easily produced.

[0035] The rubber composition according to the embodiment of the present invention is included in a stamp. For example, the transparency and adhesiveness inherent in the rubber composition can be imparted to the stamp surface of the stamp. Therefore, vermilion ink or ink can be easily adhered to the stamp surface, and the adhesion can be easily recognized regardless of the color. Furthermore, the stamp can be made to be appropriately easy to press.

[0036] The rubber composition according to the embodiment of the present invention is included in an adhesive material. This allows, for example, an adhesive material for vibration damping to be imparted with the transparency and adhesiveness inherent in the rubber composition. This makes it easier for the adhesive material to adhere to an object to which it is attached, and because it is transparent, it can be attached to the object inconspicuously.

[0037] A method for manufacturing a workpiece by processing a rubber composition according to an embodiment of the present invention includes a process of vulcanizing synthetic rubber containing at least a plasticizer in a hydraulic press. This allows for easy and efficient molding of a workpiece having a shape that conforms to the mold of the hydraulic press. In particular, since vulcanization is possible during pressing, appropriate elasticity can be easily and efficiently imparted to the workpiece.

[0038] In a method for manufacturing a processed product by processing a rubber composition according to an embodiment of the present invention, the processed product is a stamp. This allows the stamp to be easily and efficiently molded as the processed product. In particular, since vulcanization is possible during pressing, appropriate elasticity can be easily and efficiently imparted to the stamp.

[0039] In the method for manufacturing a processed product by processing a rubber composition according to an embodiment of the present invention, the processed product is an adhesive material. This allows the adhesive material to be easily and efficiently molded as the processed product. In particular, since vulcanization processing is possible during pressing, appropriate elasticity can be easily and efficiently imparted to the adhesive material.

[0040] The above-described embodiments disclosed herein are to be considered as illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0041] 100...Rubber composition 200…Processed product

Claims

1. a transparent synthetic rubber; a plasticizer added to the synthetic rubber; Including, The plasticizer is A rubber composition added in a ratio of 40 to 120 parts by weight relative to 100 parts by weight of the synthetic rubber, Adhesive and transparent Rubber composition.

2. The rubber composition according to claim 1, The plasticizer is The composition contains one or more compounds selected from the group consisting of dimethyl phthalate (DMP), diethyl phthalate (DEP), dibutyl phthalate (DBP), di-2-ethylhexyl phthalate (DEHP), diisononyl phthalate (DINP), diisodecyl phthalate (DIDP), butyl benzyl phthalate (BBP), dioctyl terephthalate (DOTP), dioctyl adipate (DOA), diisononyl adipate (DINA), dioctyl azelate (DOZ), dioctyl sebacate (DOS), tricresyl phosphate (TCP), acetyl tributyl citrate (ATBC), and trimellittrioctyl (TOTM). Rubber composition.

3. A stamp comprising the rubber composition according to claim 1 or 2.

4. An adhesive material comprising the rubber composition according to claim 1 or 2.

5. A method for processing the rubber composition according to claim 1 or 2 to produce a processed product, comprising: The process includes vulcanizing the synthetic rubber to which at least the plasticizer has been added in a hydraulic press. A method for producing a processed product of a rubber composition.

6. The manufacturing method according to claim 5, The processed product is It is a seal A method for producing a processed product of a rubber composition.

7. The manufacturing method according to claim 5, The processed product is It is an adhesive A method for producing a processed product of a rubber composition.

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