JP5939939B2 - Liquid absorbing rubber and porous rubber printed body - Google Patents

Description

  The present invention relates to a liquid absorbing rubber and a porous rubber printed body, and more particularly to a liquid absorbing rubber and a porous rubber printed body that absorb liquids such as water and oil.

  Patent Document 1 discloses a porous rubber printing body using a porous rubber having countless open cells as a printing body. The porous rubber printed body disclosed in Patent Document 1 is a master by kneading a rubber composition, 1 phr to 3 phr of carbon black, a water-soluble compound, a vulcanizing agent, a filler, and additives as necessary. The batch is obtained by vulcanizing the master batch and then removing the water-soluble compound.

JP 2003-237205 A

  However, in the invention disclosed in Patent Document 1, when carbon black is used, there is room for improvement in that carbon black is difficult to knead into the rubber composition and is difficult to roll-mold. In addition, the porous printed body using carbon black has a relatively small amount of ink consumption, which may cause fading of the seal stamp, so there is room for improvement in this respect as well.

  Then, this invention makes it a subject to provide the liquid absorption rubber and porous rubber printing body which were manufactured with the masterbatch using the substitute of carbon black.

  In order to solve the above problems, the liquid absorbent rubber of the present invention is obtained by vulcanizing a master batch kneaded after adding a plant fired body to a rubber composition.

  The plant fired body may be graphitized. The plant burned body can be any one of a burned soybean hull, a rapeseed meal burned body, a sesame meal burned body, a cottonseed meal burned body, a cotton hull burned body, a soybean shell burned body, and a cacao husk burned body.

  Moreover, the porous rubber printed body of the present invention includes the liquid absorbing rubber. The liquid-absorbing rubber is preferably used as a base layer located on the back surface of the top layer that has innumerable fine bubbles and has a stamped surface.

BEST MODE FOR CARRYING OUT THE INVENTION

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The liquid absorbent rubber according to the embodiment of the present invention is obtained by vulcanizing a master batch kneaded after adding a plant fired body or the like to a rubber composition. Specifically, in this embodiment, a water-soluble compound, a vulcanizing agent, a filler, a vulcanization aid, a vulcanization accelerator, a lubricant, and the like, which will be described below, may be appropriately added in addition to the plant fired body. it can.

  Natural rubber, styrene-butadiene rubber, acrylonitrile-butadiene rubber, chloroprene rubber, polyurethane rubber, acrylic rubber, ethylene-propylene-diene rubber, dimethyl silicone rubber, methyl phenyl silicone rubber, methyl vinyl silicone rubber, etc. are used as the rubber composition. it can.

  The type of the burned plant according to the present embodiment is not particularly limited. For example, the burned body of any one of soybean hulls, rapeseed meal, sesame meal, cottonseed meal, cotton hull, soybean hulls, cacao husk Can be used. Although a specific method for producing a plant fired body will be described later, when the conclusion is described first, the liquid absorbent rubber of the present embodiment has the advantage of being easy to roll-mold, and when applied to a porous printed body, There is an advantage that the amount of ink consumption can be relatively increased. As a secondary matter, there is an advantage that the absorption time of the liquid can be shortened depending on the firing temperature of the burned plant.

  Note that the liquid absorbent rubber of the present embodiment can be applied to a porous rubber printed body, and in such a case, the liquid absorption rubber can shorten the liquid absorption time, which means that the porous rubber printed body is manufactured. Therefore, the time until the stamping test performed thereafter can be shortened. As a result, the porous rubber printed body can be shipped in a short time.

  Here, as the porous rubber printed body, there is a single layer that does not distinguish between a two-layered one having a top layer that has innumerable fine bubbles and the engraving surface of which is engraved, and a base layer located on the back surface thereof. There are some layers. The liquid-absorbing rubber of this embodiment can be applied to both single-layer and double-layer porous rubber prints, and in the case of two layers, it can be applied to both the top layer and the base layer. . This is because the liquid-absorbing rubber of the present embodiment can be suitably used for the top layer from the surface of laser processing as described later, and can be suitably used for the base layer from the surface of its hardness. .

  In the case of a two-layer porous rubber printed body having a top layer and a base layer, the cell diameter of the base layer may be designed to be larger than the cell diameter of the top layer. This is because a stable ink supply from the base layer to the top layer becomes possible by capillary action. Further, the base layer and the top layer may be simply overlapped, or may be overlapped and vulcanized and integrated at an unvulcanized stage.

  In this embodiment, an example in which soybean hulls are selected as the raw material of the plant burned body will be described. The burned soybean hulls and burned bodies such as rapeseed meal, sesame meal, cottonseed meal, cotton hull, soybean hull, cacao husk, etc. As will be described later, since the physical characteristics, electrical characteristics, and the like are similar, it is considered that the same effect can be obtained.

  Furthermore, the liquid absorption rubber of this embodiment contains various additives other than a plant baking body. Examples of the additive include water-soluble compounds such as fine powders such as salts and sugars.

  The salt here refers to an inorganic compound that is easily finely powdered, does not decompose and gasify at the rubber vulcanization temperature (about 110 ° C. to about 160 ° C.), and can be easily removed by water after heating. Specific examples thereof include metal salts such as sodium chloride, sodium sulfate, and sodium nitrate. These can be used alone or in combination.

  In addition, the sugar referred to here swells under the influence of heat during vulcanization and generates a trace amount of moisture as a gas. This gas acts as a kind of foaming agent and has a good effect on bubble formation. Suitable specific history includes monosaccharides such as pentose and hexose, disaccharides such as saccharose and maltose, polysaccharides such as starch and glycogen, and these can be used alone, It can also be used together. In particular, starch is preferably used as the sugar. This is because starch is excellent in solubility, and a powder having a uniform required particle size can be easily obtained and is inexpensive.

  As the water-soluble compound, a salt and a sugar may be used alone, or these may be used in combination. Whether to use a salt and a sugar alone or to use them together can be selected depending on the application. When these are used in combination, the blending weight ratio of the salt and sugar is preferably about 9: 1 to about 3: 1, particularly preferably about 4: 1.

  By setting such a blending weight ratio, it is possible to prevent generation of a large amount of moisture and carbon dioxide during vulcanization due to an excessive amount of sugar. The moisture or the like makes it difficult to control the bubbles in the rubber, and the bubbles may become non-uniform, so it is necessary to avoid them. In addition, if the amount of sugar is too large, the decomposition of the sugar itself proceeds so much that the mixture may not be molded in the mold. On the other hand, if the amount of sugar is too small, the sugar particles do not intervene properly between the salt particles, and the effect of adding the sugar cannot be sufficiently exhibited.

  Although the size of the metal salt depends on the type, it is usually preferable to use a metal salt of about 32 mesh to about 350 mesh (about 0.044 mm to about 0.498 mm). Further, the metal salt may be used in an amount of about 200 parts to about 1200 parts, preferably about 400 parts to about 600 parts, relative to 100 parts of rubber.

  On the other hand, although the size of the sugar depends on the type, it is usually preferable to use a sugar of about 150 mesh path (about 0.010 mm to about 0.103 mm). Moreover, the ratio of sugar used may be about 50 parts to about 300 parts, preferably about 100 parts to about 200 parts, with respect to 100 parts of rubber.

  Examples of the vulcanizing agent (crosslinking agent) according to this embodiment include sulfur-based vulcanizing agents such as precipitated sulfur, sulfur, selenium, tellurium and sulfur chloride, t-butyl cumyl peroxide, dicumyl peroxide, 2,5- Mention may be made of peroxides such as dimethyl-2,5-di- (t-butylperoxy) hexane and 1,3-bis (t-butylperoxy-i-propyl) benzene. Any of these can be used alone or in combination of two or more. The use ratio of the vulcanizing agent may be about 2 parts to about 5 parts with respect to 100 parts of rubber, and preferably about 3 parts to about 4 parts.

  As the filler according to the present embodiment, clay, talc, silica, mica, silicic acid, magnesium silicate, calcium silicate, calcium carbonate, magnesium carbonate, titanium dioxide, silicon oxide, antimony oxide, tin oxide, black iron oxide, red oxide Examples thereof include metal oxide-coated mica obtained by coating mica with iron or the like. Any of these can also be used alone or in combination of two or more. The use ratio of the filler may be about 0.1 part to about 60 parts with respect to 100 parts of rubber.

  Furthermore, in this embodiment, various additives can also be used as needed. For example, an effective amount of an amine-based antioxidant, a softener such as petrolatum or a plasticizer, a vulcanization aid such as zinc white, or a guanidine-based vulcanization accelerator can be added. Any of these can also be used alone or in combination of two or more.

  In addition, as a lubricant, polyethylene glycol, polypropylene glycol, polyethylene glycol / polypropylene glycol copolymer, polyethylene glycol alkyl ether, polypropylene glycol alkyl ether, polyvinyl alcohol, polyallylamine, paraffin, wax, higher fatty acid, fluorosurfactant, silicone An effective amount of a system surfactant, a nonionic surfactant or the like can also be added. Any of these can also be used alone or in combination of two or more.

  Further, an appropriate amount of organic synthetic fiber can be added. Organic synthetic fibers include polyethylene terephthalate fibers, polyacrylonitrile fibers, acrylic fibers, aliphatic polyamide fibers such as nylon 6, nylon 6/6, nylon 4/6, nylon 6/10, nylon 11, etc., polypropylene fibers, polyethylene Fiber, polyvinyl alcohol fiber, polyvinyl chloride fiber, polyvinylidene chloride fiber, polyurethane fiber, polyalkyl paraoxybenzoate fiber, polytetrafluoroethylene fiber, aramid fiber, wholly aromatic polyester fiber, poly-p-phenylenebenzobisthiazole fiber, Poly-p-phenylenebenzbisoxazole fiber, polybenzimidazole fiber, polyoxymethylene fiber, and the like can be used, and staples having a fiber length of about 0.2 mm to about 2 mm are used. Any of these can also be used alone or in combination of two or more. Further, it is preferable to use those organic synthetic fibers having a fineness of 0.1d to 100d.

  Next, a liquid absorbing rubber according to the present embodiment and a method for producing a porous rubber printed body using the same will be described. First, the manufacturing method of the plant baking body contained in the liquid absorption rubber of this embodiment is demonstrated to the case where soybean hulls are used as an example.

  Here, when edible oil or the like is produced using soybean as a raw material, a large amount of soybean hulls are generated. Most of these have been reused for livestock feed and agricultural fertilizers, but further uses have been explored. As a result of studying day and night from the viewpoint of ecology, it was found that as a further reuse of soybean hulls, the burned soybean hulls are beneficially used as an additive for liquid absorbent rubber. In addition, apart from whether it is a food residue or not, the manufacturing process in the case of using a material other than soybean hulls as the raw material of the burned plant may be the same as the process described below.

  FIG. 1 is a schematic production process diagram of a burned soybean hull according to the present embodiment. First, raw soybean hulls generated during the production of edible oil, etc. are set in a carbonization device, and the temperature is increased by about 2 [° C.] per minute in an inert gas atmosphere such as nitrogen gas or in vacuum, and 700 A predetermined temperature such as [° C.] to 1500 [° C.] (for example, 900 [° C.]) is reached. Then, a carbonization baking treatment is performed at an ultimate temperature for about 3 hours. As the carbonization apparatus, a stationary furnace, a rotary kiln, or the like can be used.

  In addition, in manufacturing each plant fired body, it is also a method to include a phenol resin such as a resol type phenol resin and then set it in a carbonization apparatus. When a resol type phenol resin or the like is mixed, the strength and carbon content of the burned soybean hull can be improved. However, it should be noted that the mixing itself is not always necessary for manufacturing the heat conducting member of the present embodiment.

  Subsequently, the burned soybean hull according to the present embodiment is selectively heated at a temperature of, for example, about 1500 [° C.] to 3000 [° C.] using a carbonization apparatus such as a stationary furnace or a rotary kiln. It can also be graphitized by baking soybean hulls or the like at an ultimate temperature for about 3 hours in an active gas atmosphere or in a vacuum.

  Next, after baking or graphitized soybean hulls are pulverized, they are sieved using, for example, a 106 μm square mesh. Through the sieving process, a burned soybean hull having a median diameter of, for example, about 4 μm to about 85 μm (for example, 60 μm) is obtained. In the present embodiment, a burned soybean hull was manufactured through the above steps. However, it is not essential to perform the carbonization firing treatment and the graphitization treatment separately, and these treatments may be performed in series.

  Under the above sieving conditions, about 80% of the whole baked product such as soybean hulls is 85 μm or less. In this case, the median diameter is, for example, about 30 μm to about 60 μm. Hereinafter, unless otherwise specified, the particle diameter of the burned soybean hulls will be described as the median diameter.

  The median diameter was measured using a laser diffraction particle size distribution analyzer SALD-7000 manufactured by Shimadzu Corporation. In this embodiment, a burned soybean hull having a median diameter of, for example, 30 μm to about 60 μm, and a selectively burned soybean hull obtained by selectively further pulverizing to obtain a burned soybean hull having a minimum median diameter of approximately 1 μm.

  The fine pulverization referred to in this specification means pulverization so that the median diameter of the material before pulverization is lowered by about one digit order. Therefore, for example, if the median diameter before pulverization is 30 μm, it means pulverization to be 3 μm. However, the fine pulverization does not mean that the median diameter before fine pulverization is strictly reduced by about an order of magnitude, but is pulverized so that the median diameter before fine pulverization is, for example, 1/5 to 1/20. Including. In the present embodiment, pulverization was performed in such a manner that the median diameter after pulverization is 1 μm when the median diameter is minimum.

  Next, component analysis by the ZAF quantitative analysis method was performed on the burned soybean hulls thus produced. For C, H, and N elements, component analysis by organic elemental analysis was also performed. In addition, the baking temperature was about 900 [° C.], and the median diameter was within the range of about 30 μm to about 60 μm. In addition, component analysis was also performed on each baked product of rapeseed meal, sesame meal, cottonseed meal, cotton hull, and cacao husk produced in the process shown in FIG.

  As an analysis result, it can be evaluated that the ratio of the organic elements contained in each plant fired body is the same. This seems to be caused by the fact that soybean hulls and rapeseed meal are both plants. Still, the burned rapeseed meal, sesame meal, and cottonseed meal have a commonality of oil cake, so “N” is relatively large, and the increase rate of “C” before and after firing is relatively high. Is low.

  On the other hand, the same results were obtained for the burned bodies of soybean hulls and cotton hulls because of the commonality of the hulls. Specifically, “N” is relatively small, and “C” before and after baking. The rate of increase is relatively high. On the other hand, the cacao husk fired body is similar in that “N” is relatively small compared to the burned soybean hull, but the increase rate of “C” before and after firing is relatively low. I can say that. Focusing on “C”, cotton hull is the highest (about 83%) and sesame meal is the lowest (about 63%).

  Next, each raw material containing the plant fired body produced by the above steps is put into a kneader and kneaded to obtain a master batch. Next, the shape is adjusted with a calendar roll or a press to create an unvulcanized sheet.

  Then, the sheeted master batch is put into a mold and heated and vulcanized at a temperature of about 80 ° C. to 160 ° C. for about 10 minutes to about 2 hours. As the heating means, for example, electric heating or steam heating can be used. Next, the vulcanized product is taken out from the mold, and the water-soluble compound is washed out while repeatedly compressing and expanding using cold water or hot water. Thereby, a porous rubber sheet having open cells is obtained. If this porous rubber sheet is cut into an appropriate size, a liquid absorbing rubber can be obtained.

  Next, when the liquid absorbing rubber is used for the top layer, after engraving the printing surface using a carbon dioxide laser processing machine or a YAG laser processing machine, it may be used after being cut into an appropriate size. On the other hand, when liquid absorbing rubber is used for the base layer, it may be used after being cut into an appropriate size.

  In the case of a two-layer porous rubber printed body having a base layer and a top layer, the base layer and the top layer, which are overlapped at the unvulcanized stage, are vulcanized and integrated, and then the top layer side Then, the stamping surface is engraved using a carbon dioxide gas laser processing machine or a YAG laser processing machine and then cut into an appropriate size for use.

  Hereinafter, the porous rubber printed body of the example of the present invention will be described in more detail. However, it should be noted that the present invention is not limited to these examples.

  Softening consisting of about 100 parts synthetic rubber (NBR), about 3.5 parts sulfur, about 5 parts zinc white, about 5 parts vulcanization accelerator, liquid rubber (low polymerized NBR molecular weight), petrolatum, DBP, etc. About 30 parts, about 50 parts of burned soybean hulls fired at a firing temperature of about 900 ° C., about 28 parts of silica, about 2 parts of anti-aging agent, about 200 mesh to about 350 mesh (about 0.044 mm) To about 0.074 mm) sodium chloride and about 150 to about 250 mesh (about 0.062 mm to about 0.103 mm) starch, and then knead them into a masterbatch. Produced (Example 1).

  Further, in comparison with Example 1, with respect to the burned soybean hulls, instead of the addition amount of about 50 parts, as the addition amount of about 100 parts, other conditions are the same as in Example 1, A master batch was prepared (Example 2).

  Furthermore, the manufacturing conditions of the burned soybean hulls were changed to the firing temperature of about 3000 ° C., and the graphitized burned soybean hull was used. Manufactured (Examples 3 and 4)

Subsequently, the master batch according to each example was formed into a flat sheet having a thickness of about 5 mm using a calendar roll. Next, the sheets were accommodated in a smooth mold. Next, a pressure of about 200 kg / cm ² was applied to sandwich between the hot plates, and vulcanized at a temperature of about 100 ° C. for about 60 minutes.

  Thereafter, after each vulcanization, each was released from mold, washed thoroughly with water until sodium chloride and starch were completely removed, and then dehydrated and dried to produce a liquid absorbent rubber. Then, in order to check the suitability as the top layer, the liquid absorbing rubber is cut into an appropriate size after performing a desired engraving with a YAG laser processing machine, and engraved in order to see the suitability as a base layer. It cut | disconnected to the appropriate size, without performing.

  Table 1 shows, for each of Examples 1 to 4, the ease of roll forming when producing a liquid absorbent rubber, the hardness of the liquid absorbent rubber, the ink consumption by the porous rubber print, the specifics by the liquid absorbent rubber. It is a table | surface which shows evaluation results, such as an absorption time of a simple liquid. In addition, it replaces with a burned soybean hull for reference, and also added what added 50 parts of commercially available two types of carbon black to Table 1 (comparative examples 1 and 2) for reference. . Moreover, for easy understanding, the firing temperature of the burned soybean hulls and the content of the rubber composition in Examples 1 to 4 are also shown.

  As shown in Table 1, when the porous rubber printing bodies of Examples 1 to 4 and the porous rubber printing bodies of Comparative Examples 1 and 2 are compared for roll molding, all of Examples 1 to 4 are mixed. Good kneadability and easy to mold. On the other hand, those of Comparative Examples 1 and 2 had slightly poor kneadability, so that it was difficult to knead carbon black into the rubber composition, and roll molding was difficult.

  Next, when the porous rubber printed bodies of Examples 1 to 4 and the porous rubber printed bodies of Comparative Examples 1 and 2 are compared in terms of hardness, it can be seen that Examples 1 to 4 are relatively lower. This indicates that the porous rubber printed bodies of Examples 1 to 4 are softer than the porous rubber printed bodies of Comparative Examples 1 and 2. Since it is recommended that the base layer of the porous rubber printed body has a hardness of about 5 to 30, the porous rubber printed body of Examples 1 to 4 can be suitably used as the base layer, in particular. I understand.

  For the measurement of hardness, place the porous rubber print body to be tested on a hard, rigid flat surface and hold the E-type hardness meter so that the push needle is perpendicular to the measurement surface of the porous rubber print body. Then, the measurement was performed by bringing the test piece into close contact with the test piece measurement surface as quickly as possible so that no impact was applied to the pressure surface and reading the scale. This measuring method is based on JIS K 6253.

  Next, regarding the processability with a YAG laser, the porous rubber printed bodies of Examples 1 to 4 and Comparative Examples 1 and 2 were both excellent. Also, the processing speed with the YAG laser was almost the same. Therefore, regarding laser processing for engraving, it can be said that there is no significant difference between the porous rubber printed bodies of Examples 1 to 4 and the porous rubber printed bodies of Comparative Examples 1 and 2, and both are suitable for the top layer. Can be used.

  Next, regarding the ink consumption, the porous rubber printed bodies of Examples 1 to 4 and the porous rubber printed bodies of Comparative Examples 1 and 2 are compared. A large amount of ink consumption exceeding 350 mg was confirmed. On the other hand, for the porous rubber prints of Comparative Examples 1 and 2, Comparative Example 2 was able to confirm a large amount of ink consumption as in Examples 1 to 4, but Comparative Example 1 was Only a small amount of ink consumption could be confirmed. From this point of view, even in the case of porous rubber prints using carbon black, if carbon black is selected, it may be good in terms of ink consumption.

  However, with respect to the porous rubber prints of Comparative Examples 1 and 2, when the carbon black content in the rubber composition was taken as 100 parts, it was found that they were extremely reduced to 116 mg and 160 mg, respectively. Therefore, regarding the porous rubber printed bodies of Comparative Examples 1 and 2, it is considered that the selection of carbon black must be strictly performed when it is desired to relatively increase the carbon black content relative to the rubber composition.

The ink consumption was measured as follows. First, the porous rubber printed body to be measured was a cylindrical shape having a thickness of 5 mm and a diameter of 9.5 mm. In this case, the area under the printing surface is about 25 mm ² . As the ink, an oily pigment-based vermilion ink having a viscosity of about 700 mPa · s was saturated and impregnated into a porous rubber printing body, and the ink consumption was measured after continuous printing on fine paper 5000 times. It can be considered that the greater the ink consumption, the more ink is ejected per stamping, and the higher the foamability. If the ink consumption is 300 mg or more, it can be determined that the continuous foaming property is good.

  Next, the ink absorption time was measured. As the ink, a pigment having a high viscosity of about 500 mPa · S to about 2000 mPa · S (about 20 ° C. to about 30 ° C.) was used. Here, after placing a pad impregnated with ink (ink occluding body) in a petri dish filled with ink and placing the porous rubber printed body on the pad, the entire porous rubber printed body is impregnated with ink. Was measured.

  In each of the examples and comparative examples, a porous rubber printing body having a size of 9.5 mm × 9.5 mm × 5.0 mm was used, and the ink was an oil pigment vermilion ink / viscosity of about 700 mPa · s. As the ink occlusion body, a sintered body (porous body) made of a formalin condensate of polyvinyl alcohol was used. Further, this measurement was performed 20 times at a temperature of about 20 ° C. and a humidity of about 65%, and Table 1 shows an average value of these.

  In the case of the porous rubber printed bodies of Examples 1 and 2 and Comparative Examples 1 and 2, the ink absorption completion of any of the comparative examples could not be confirmed even after 2000 minutes. In contrast, in the case of the porous rubber printed body of Example 3, the completion of ink absorption could be confirmed in 1620 minutes. Furthermore, in the case of the porous rubber printed body of Example 4, the completion of ink absorption could be confirmed in only 90 minutes. From this, it can be said that if the burning temperature of the burned soybean hulls is relatively high, the ink absorption can be shortened.

  As described above, in the present specification, the case where the liquid absorbing rubber is mainly applied to the porous rubber printed body has been described as an example. However, the use of the liquid absorbing rubber of the present embodiment is not limited to this. For example, it can be applied as a rubber for absorbing surplus lubricating oil disposed around a so-called Gunpla in which lubricating oil is added to resin. From the same point of view, the liquid absorbing rubber of the present embodiment can also be used around the sliding portion or rotating portion where the lubricant is used. Specifically, it can be used in the vicinity of a guide rail or motor around an elevator such as an elevator or escalator, around a sliding member for a lubricating device, around a motor of office equipment such as a copying machine, printer, or facsimile.

  Moreover, the liquid absorption rubber of this embodiment can be used also for an oil-absorbing filler, for example. The oil-absorbing filler is used for a variable displacement piston pump used as a hydraulic pressure generation source of a hydraulic circuit. Specifically, the heat-resistant resin film provided on the sliding contact surface between the cradle and the receiving part contains an oil-absorbing filler, and the liquid-absorbing rubber of the present embodiment is used as the oil-absorbing filler. Can do.

  Furthermore, the liquid absorbing rubber of the present embodiment can be applied to a belt such as a belt drive. Specific examples include V-ribbed belts used for automobiles, flat belts used for pulleys, round belts, V-belts used for transmissions, and the like.

It is a typical manufacturing process figure of the soybean hull baking body which concerns on embodiment of this invention.

Claims (4)

A porous rubber printing body comprising a liquid absorbing rubber obtained by vulcanizing a master batch kneaded after adding a plant fired body to a rubber composition. The porous rubber printed body according to claim 1, wherein the plant fired body is graphitized. The plant burned body is any one of a burned soybean hull, a rapeseed meal burned body, a sesame meal burned body, a cottonseed meal burned body, a cotton hull burned body, a soybean shell burned body, and a cacao husk burned body. 2. The porous rubber printed body according to 2 . The liquid absorbing rubber, cellular rubber printing material according to claim 1, wherein used as a base layer positioned on the back of the top layer seal face have a myriad of fine bubbles is engraved.