JP2019218413A - Rubber molding, sealant, automobile component, uncrosslinked rubber composition, and method for producing rubber molding - Google Patents

Abstract

To provide a method that can improve the hardness of a rubber molding, yet it can suppress the Mooney viscosity of an uncrosslinked rubber composition from increasing during its production, compared with the case of using carbon black.SOLUTION: A rubber molding at least contains a base material resin, and glass wool, the base material resin being a rubber component. In the rubber molding, the content of the glass wool is 1-100 pts.wt. relative to the base material resin 100 pts.wt. The rubber molding is a foamed rubber containing foam. An uncrosslinked rubber composition contains a base material resin, glass wool, and a crosslinker and/or foaming agent.SELECTED DRAWING: Figure 1

Description

  The present application relates to a rubber molded article, a sealing material, an automobile component, an uncrosslinked rubber composition, and a method for producing a rubber molded article.

  Rubber moldings have long been used for sealing materials such as joint seals, gaskets, weather strips for automobiles, and the like. Various fillers are added to the rubber molding according to the purpose. For example, when it is necessary to reinforce a rubber molded body, it is known to add a filler such as carbon black or silica (see Patent Document 1).

International Publication No. 96/17015

  Carbon black is widely used as a filler for rubber molded articles because it has a small specific gravity and is effective in improving compression set. By the way, various characteristics are required for the rubber molded article according to the use, and the kind and amount of the filler to be added are adjusted according to the use. When carbon black is used as the filler, the hardness of the rubber molded body can be increased by increasing the amount of the carbon black. However, when carbon black is added, the Mooney viscosity increases, so that there is a problem that it is difficult to extrude the mixed material from the nozzle when manufacturing a rubber molded product.

  The present application has been made to solve the above problems, and after extensive research, by including glass wool when producing a rubber molded article, while the hardness of the produced rubber molded article can be increased It was newly found that the increase in Mooney viscosity at the time of production as compared with carbon black was suppressed.

  That is, an object of the present invention is to provide a rubber molded product containing glass wool, a sealing material, an automobile component, an uncrosslinked rubber composition, and a method for producing a rubber molded product.

  The present application relates to a rubber molded product, a sealing material, an automobile component, an uncrosslinked rubber composition, and a method for producing a rubber molded product, which are described below.

(1) a base resin, and at least glass wool,
The base resin is a rubber component,
Rubber molding.
(2) The content of the glass wool is 1 to 100 parts by weight with respect to 100 parts by weight of the base resin.
The rubber molded article according to the above (1).
(3) The rubber molded article according to the above (1) or (2), wherein the rubber molded article is a foam rubber containing air bubbles.
(4) A sealing material comprising the rubber molded product according to (1) to (3).
(5) An automotive component comprising the rubber molded product according to (1) to (3).
(6) a base resin, and at least gross wool,
The base resin is a rubber component,
Uncrosslinked rubber composition.
(7) further comprising a crosslinking agent and / or a foaming agent;
The uncrosslinked rubber composition according to the above (6).
(8) a mixing step of mixing an uncrosslinked rubber composition containing at least a base resin, glazing wool, and a crosslinking agent;
A molding step of molding the uncrosslinked rubber composition mixed in the mixing step,
A crosslinking step of crosslinking the uncrosslinked rubber composition molded in the molding step,
At least
The base resin is a rubber component,
A method for producing a rubber molded body.
(9) The content of the glass wool is 1 to 100 parts by weight based on 100 parts by weight of the base resin.
The method for producing a rubber molded article according to the above (8).
(10) The uncrosslinked rubber composition further contains a foaming agent,
The method for producing a rubber molded article according to the above (8) or (9).

  By using glass wool as a filler, it is possible to suppress an increase in Mooney viscosity during production as compared with carbon black, and to obtain a rubber molded body having increased hardness.

FIG. 1 is a drawing substitute photograph, FIG. 1 (A) is a photograph of glass wool, and FIG. 1 (B) is a photograph of glass fiber.

  Hereinafter, embodiments of a rubber molded product, a sealing material, an automobile component, an uncrosslinked rubber composition, and a method for producing a rubber molded product will be described in detail.

The rubber molding is
(1) a mixing step of mixing an uncrosslinked rubber composition containing at least a base resin, glazing wool, and a crosslinking agent;
(2) a molding step of molding the uncrosslinked rubber composition mixed in the mixing step,
(3) a crosslinking step of crosslinking the uncrosslinked rubber composition molded in the molding step,
At least. Hereinafter, each raw material will be described.

<Rubber component>
The base resin is composed of a rubber component. The rubber component is not particularly limited as long as it is a component generally used in a rubber molded article. For example, ethylene-propylene rubber, that is, EPDM (rubber-like copolymer of ethylene, propylene, and diene) or EPM (rubber-like copolymer of ethylene, propylene) may be used. EPDM is obtained by copolymerizing ethylene, propylene, and a third component having an unsaturated bond in a side chain. Specifically, the third component is composed of 5-ethylidene-2-norbonene (ENB) ENB-based EPDM and DCP-based EPDM in which the third component is exo-dicyclopentadiene (DCP), endo-dicyclopentadiene (EDCP), dicyclopentadiene (DCPD), or the like. Other rubber components include CR (chloroprene rubber), SBR (rubber-like copolymer of styrene and butadiene), NBR (butadiene acrylonitrile rubber), IIR (butyl rubber), IR (isoprene rubber), NR (natural rubber) , BR (butadiene rubber), RB (1,2-polybutadiene), ACM (acrylic rubber), CSM (chlorosulfonated polyethylene), Q (silicone rubber), FKM (fluoro rubber), U (urethane rubber) and the like. . The exemplified rubber components may be used alone, or two or more components may be used in combination.

<Glass wool>
The glass wool means a glass fiber having a fiber diameter of about 1 to 7 μm in a flocculent shape. FIG. 1A is a photograph of glass wool. On the other hand, glass fibers (glass long fibers) having a fiber diameter of 10 to 18 μm are also known (see FIG. 1B). Glass fiber is generally used as a chopped strand in which 50 to 200 fibers are collected and cut into a predetermined length. As shown in FIGS. 1 (A) and 1 (B), glass wool and glass fiber are completely different in the production method and the purpose of use.

  Glass wool is manufactured by spinning a spinner having a large number of small holes of about 1 mm around it at high speed to eject molten glass. This manufacturing process is generally called a centrifugal method, and by adjusting the viscosity and rotation speed of the molten glass, thin glass wool of about 1 to 7 μm can be economically manufactured. In addition, glass wool can be produced by the above method, but a commercially available product may be used. The fiber length of the glass wool is not particularly limited as long as it can be mixed and kneaded with the rubber component, but if the fiber length is too long, it becomes difficult to mix with the rubber component. Therefore, when mixing, glass wool having a fiber length of about 300 μm to 50 mm may be used. Examples of glass components for forming glass wool include known components such as E glass, C glass, A glass, S glass, D glass, NE glass, T glass, H glass, Q glass, and quartz glass. .

  Glass wool is an inorganic material. On the other hand, since the rubber component is an organic material, simply filling the glass component with the glass wool weakens the adhesiveness between the glass wool and the rubber component. Therefore, glass wool may be surface-treated with a silane coupling agent and then mixed with a rubber component.

  The silane coupling agent is not particularly limited as long as it has been conventionally used, and may be determined in consideration of the reactivity with the rubber component and the like. For example, silane coupling agents such as aminosilane, epoxysilane, allylsilane, and vinylsilane can be used. As these silane coupling agents, commercially available products such as Z series manufactured by Dow Corning Toray Co., Ltd., KBM series, KBE series manufactured by Shin-Etsu Chemical Co., Ltd., and JNC may be used.

  The silane coupling agent can be dissolved in a solvent and sprayed and dried on glass wool to perform surface treatment on glass wool. The weight percentage of the silane coupling agent with respect to the glass wool is 0.1 to 2.0 wt%, preferably 0.15 to 0.4 wt%, more preferably 0.24 wt%.

  Glass wool may be surface treated with a lubricant. The lubricant is not particularly limited as long as the glass wool is made to slide easily and is easily filled in the rubber component when the glass wool is mixed with the rubber component. For example, a conventionally used lubricant such as silicone oil can be used, but calixarene is particularly preferred. Silicone is an oil and has a poor affinity for the rubber component.However, calixarene is a phenolic resin, which improves the sliding of glass wool, while it has excellent affinity for the rubber component. It can be filled into the rubber component while maintaining its length.

  The surface treatment of glass wool is performed by spraying and drying a solution in which calixarene is dissolved on glass wool. The solution in which the calixarene is dissolved can be produced by a known production method. For example, a nanodaX plastic modifier nanodaX (registered trademark) may be used. The weight percentage of the plastic modifier nanodaX (registered trademark) with respect to glass wool is preferably 0.001 to 0.5 wt%, more preferably 0.01 to 0.3 wt%.

  Glass wool may be treated with the silane coupling agent or the lubricant, or may be treated with the silane coupling agent and the lubricant.

  In addition, the glass wool of the present invention may be used in addition to the above-mentioned surface treatment with a silane coupling agent and / or a lubricant, and may form a known film such as an epoxy resin, a vinyl acetate resin, a vinyl acetate copolymer resin, a urethane resin, and an acrylic resin. May be surface-treated with an agent. These film-forming agents can be used alone or in combination of two or more, and the weight percentage of the film-forming agent is preferably 5 to 15 times the silane coupling agent.

  The content of glass wool in the rubber molded product, and the content of glass wool in the mixing step of mixing the uncrosslinked rubber composition in the method for producing a rubber molded product, are within a range in which the hardness of the produced rubber molded product can be increased. There is no particular limitation as long as it is within. As shown in Examples and Comparative Examples described below, the hardness increases as the content of glass wool increases. Therefore, if glass wool is included, the hardness will be high, so that glass wool is expected to be at least 1 part by weight, at least 3 parts by weight, at least 5 parts by weight, at least 10 parts by weight, etc. with respect to 100 parts by weight of the base resin. The amount may be such that the hardness is obtained. On the other hand, in comparison with carbon black, the Mooney viscosity of the uncrosslinked rubber composition at the time of production is suppressed from being increased, but the Mooney viscosity of the uncrosslinked rubber composition at the time of production is too high when the content of glass wool is too large. Become. Therefore, the glass wool may be appropriately adjusted to 150 parts by weight or less, 100 parts by weight or less, 75 parts by weight or less, 50 parts by weight or less with respect to 100 parts by weight of the base resin.

  The content of glass wool in the rubber molded article, and the content of glass wool in the mixing step of mixing the uncrosslinked rubber composition in the method for producing a rubber molded article are as described above, but before the mixing step is performed. In the step of compounding the various materials, an uncrosslinked rubber composition (master batch) containing more glass wool may be used. In the mixing step, the desired glass wool content in the mixing step can be obtained by mixing the master batch and the rubber component containing no glass wool. The glass wool content of the uncrosslinked rubber composition used as the master batch is preferably as large as possible so long as it can be contained in the rubber component as the base resin. In addition, the uncrosslinked rubber composition used as the master batch may include the rubber component and the glass wool as the base resin, and may further include a crosslinking agent and / or a foaming agent as necessary. .

<Crosslinking agent>
The crosslinking agent is not particularly limited as long as the rubber component can be crosslinked, and a known crosslinking agent may be used. Crosslinking agents typically include sulfur, but organic peroxides can also be used. The amount of the crosslinking agent added may be 0.1 to 5 parts by weight based on 100 parts by weight of the rubber component. When the content of the crosslinking agent is less than 0.1 part by weight with respect to 100 parts by weight of the rubber component, the rubber component is not properly crosslinked, and various physical properties of the obtained rubber molded article are reduced. On the other hand, if it exceeds 5 parts by weight, the degree of crosslinking is too high, which causes a reduction in various physical properties of the rubber molded article.

  For crosslinking of the rubber component (crosslinking step), a normal pressure hot air heating furnace (HAV), a fluidized bed heating furnace (LCM), a microwave heating furnace (UHF), or the like may be used.

<Blowing agent>
When the rubber molded body is manufactured as a foamed rubber containing air bubbles, a foaming agent may be added during the mixing step. Various chemical blowing agents can be used as the blowing agent. Specifically, 4,4′-oxybisbenzenesulfonylhydrazide (OBSH), azodicarbonamide (ADCA), and N, N′-dinitrosopentamethylenetetramine (DPT), which are organic decomposition-based blowing agents, are used. be able to. These foaming agents may be used alone or in a combination of two or more.

  The amount of the foaming agent to be added can be appropriately adjusted in consideration of the specific gravity of the obtained foamed rubber, the amount of gas generated from the foaming agent, and the like. Just fine. When the content of the foaming agent is less than 1 part by weight with respect to 100 parts by weight of the rubber component, it is difficult to obtain the effect of weight reduction, and when it is more than 5 parts by weight, physical properties such as strength are reduced.

<Filler>
In various embodiments, the hardness of the rubber molded body manufactured by including glass wool is increased, but a conventionally used filler may be used in combination as long as the effect is not impaired. Examples of the filler include carbon black, silica, calcium carbonate, calcium silicate, magnesium oxide, aluminum oxide, barium sulfate, talc, mica, and silytin. These fillers may be used alone or in combination of two or more. The filler may be added during the mixing step.

<Other additives>
In addition, the rubber molded article may further contain other additives such as a softening agent, a crosslinking accelerator, a crosslinking accelerator, a processing aid, a thermoplastic resin, a pigment, and the like, if necessary. The softener is for facilitating kneading at the time of mixing the rubber component and the additive, and examples thereof include a paraffinic oil. Examples of the crosslinking accelerator include thiuram-based, dithiocarbamine-based, thiazole-based, sulfenamide-based, and guanidine-based compounds. Examples of the crosslinking promotion assistant include zinc oxide. Examples of the processing aid include stearic acid and the like. The thermoplastic resin is used to adjust the hardness of the rubber molded body, and includes polyethylene and the like. In addition, resin components other than the base resin (rubber component) (thermoplastic resin, lubricant calixarene (thermosetting resin), film-forming agent (thermosetting, photosetting resin)) in the rubber molded product If the content is too large, the function as a rubber molded body, such as a decrease in elasticity, is reduced. Therefore, when a resin component other than the base resin is added, the content is desirably 30 parts by weight or less based on 100 parts by weight of the rubber component. One of these various additives may be added alone, or two or more of them may be mixed. The additives may be added during the mixing step.

  The rubber molded body is extruded while crosslinking the uncrosslinked rubber composition mixed in the mixing step at a predetermined temperature, or formed into a predetermined shape using a mold or the like, and then heated to form a desired shape. be able to. That is, the molding step and the cross-linking step may be performed simultaneously or separately. Specific examples of the molding method include, for example, compression molding, injection molding, extrusion molding, extrusion laminate molding, calendar molding, injection molding, and transfer molding, but other methods may be used. In addition, the rubber molded product can be made to contain glass wool only in the intended portion of the rubber molded product by co-extrusion of an uncrosslinked rubber composition containing glass wool and an uncrosslinked rubber composition containing no glass wool. . In that case, the hardness of the desired portion of one rubber molded body can be changed.

  As a specific application of the rubber molded article, any product in which a rubber molded article is conventionally used may be used. For example, parts for automobiles, parts for ships, parts for civil engineering and construction, parts for medical use, electric / electronic devices. Parts, transportation equipment and leisure parts, hoses (radiator hoses, heater hoses, etc.), anti-vibration rubber, sheets, various belts, various packings, sealing materials, potting materials, coating materials, adhesives and the like.

  Automotive parts include, for example, glass run channel, weather strip sponge, door opening trim, sealant, tire, grommet, automobile engine gasket, electrical component or oil filter sealing material; igniter HID or automotive hybrid IC potting material Coating materials for automobile bodies, automotive window glasses, engine control boards; gaskets such as oil pans or timing belt covers, moldings, headlamp lenses, sunroof seals, and adhesives for mirrors. Examples of the weather strip sponge include a door weather strip, a trunk weather strip, a luggage weather strip, a roof side rail weather strip, a sliding door weather strip, a ventilator weather strip, a sliding roof weather strip, a front window weather strip, a rear window weather strip, Examples include quarter window weather strips, lock pillar weather strips, door glass outer weather strips, and door glass inner weather strips.

  Examples of the marine component include a wiring connection branch box, a sealing material for an electric system component or an electric wire, and an adhesive for an electric wire or glass.

  Examples of parts for civil engineering construction include, for example, a joint joint of a glass screen method for a commercial building, a joint around a glass between a sash, an interior joint in a toilet, a washroom or a showcase, a joint around a bathtub, and a prefabricated house. Sealants for building materials used for outer wall expansion joints and sizing board joints; Sealants for double glazing; Sealants for civil engineering used for road repair; Paints and adhesives for metals, glass, stone, slate, concrete or tile An adhesive sheet, a waterproof sheet or an anti-vibration sheet.

  Examples of the medical part include a medical rubber stopper, a syringe gasket, and a rubber stopper for a reduced-pressure blood vessel.

  Examples of electric / electronic equipment parts include heavy electric parts, light electric parts, sealing materials, potting materials, coating materials or adhesive materials for circuits and boards of electric / electronic devices; repair materials for electric wire coatings; insulation of electric wire joint parts. Sealing materials; rolls for OA equipment; vibration absorbers; grommets; or encapsulating materials for gels or capacitors.

  Examples of parts for transport aircraft include parts for automobiles, ships, aircraft, railway vehicles, and the like.

  Examples of leisure components include swimming members such as swimming caps, diving masks, and ear plugs; and gel buffer members such as sports shoes and baseball gloves.

  Examples of the anti-vibration rubber include, for example, anti-vibration rubber for automobiles (engine mount, liquid-tight engine mount, damper pulley, chain damper, carburetor mount, torsional damper, strut mount, rubber bush, bumper rubber, helper rubber, spring seat, Shock absorber, air spring, body mount, bumper guard, muffler support, rubber coupling, center bearing support, rubber for clutch, differential mount, suspension bush, slide bush, cushion strut bar, stopper, handle damper, radiator supporter or muffler hanger) , Railway anti-vibration rubber (slab mat, ballast mat or track mat), industrial machinery anti-vibration rubber (expansion joint, flexi Le joint, bush, mounted) and the like.

  Examples of the sheet include a roofing sheet and a waterproof sheet.

  Various belts include transmission belts (V-belts, flat belts, toothed belts, timing belts), transport belts (light transport belts, cylindrical belts, rough top belts, transport belts with flanges, transport with U-shaped guides) Belts, transport belts with V-shaped guides) and the like.

  Suitable examples of the sealing material include sealing materials for refrigerators, freezers, washing machines, gas meters, microwave ovens, steam irons, and earth leakage breakers. Note that the sealing material refers to a material for sealing (sealing). Further, in various industries such as machinery, electricity, and chemistry, materials used for the purpose of watertightness and airtightness of joints and contact portions are also sealing materials in a broad sense.

  Examples of the potting material include a material for potting a transformer high-voltage circuit, a printed circuit board, a high-voltage transformer with a variable resistor, an electrical insulating component, a semiconductive component, a conductive component, a solar cell, or a flyback transformer for a television.

  Examples of the coating material include various circuit elements such as a high-voltage thick film resistor or a hybrid IC; an electrical insulating component; a semiconductive component; a conductive component; a module; a printed circuit; a ceramic substrate; A material for coating a buffer material; a semiconductive element; or an optical fiber for optical communication.

  As the adhesive, for example, an adhesive for a cathode ray tube wedge, a neck, an electrically insulating component, a semiconductive component, or a conductive component is preferably exemplified.

  In addition to the above, rubber moldings are used for automobile cup and seal materials (master cylinder piston cup, wheel cylinder piston cup, constant velocity joint boot, pin boot, dust cover, piston seal, packing, O-ring, diaphragm, dam windshield, Door mirror brackets, seal head lamps, seal cowl tops), industrial seal materials (capacitor packing, O-rings, packing), foams (hose protection sponges, cushion sponges, heat insulating sponges, insulation pipes), coated electric wires, Wire joints, electrical insulation parts, semiconductive rubber parts, OA equipment rolls (charging rolls, transfer rolls, developing rolls, paper feed rolls), industrial rolls (iron making rolls, paper making rolls, printing wire rolls), anode caps ,plug Cap, ignition cable, lamp socket cover, terminal cover, wiper blade, various tubes (vacuum tube, tire tube), air spring, shoe sole, shoe heel, tire sidewall, is suitably used in applications such as fabric coatings.

  Hereinafter, the present invention will be described by way of examples, which are provided merely for reference of specific embodiments. These examples are not meant to limit or limit the scope of the invention.

[Raw material and compounding ratio of rubber molded body]
The raw materials and compounding ratios of the rubber molded bodies manufactured in the examples and comparative examples are as shown in Tables 1 to 3. The raw materials used are as follows.

Table 1 (Examples 1 to 5 and Comparative Examples 1 and 2, rubber component: SBR)
<Rubber component>
・ “JSR SL552” manufactured by JSR
<Filler>
・ Carbon black: “Asahi # 60” manufactured by Asahi Carbon Co., Ltd.
-Glass wool: Glass wool was manufactured by a centrifugal method. The fiber diameter was about 2-6 μm. The surface treatment of the glass wool was performed by spraying a solution containing a silane coupling agent from a binder nozzle onto fiberized glass wool from a spinner. The aminosilane coupling agent S330 (manufactured by JNC) was used as the silane coupling agent, and the weight percentage of the silane coupling agent to glass wool was 0.24 wt%. The glass wool was dried at 150 ° C. for 1 hour, and then crushed by a cutter mill to an average fiber length of 850 μm.

<Oil>
・ Sansen 450 manufactured by Nippon Sun Oil Co., Ltd.
<Crosslinking agent>
・ Sulfur: Tsurumi Chemical Industry's “Kinka-In Fine Powder Sulfur 200mesh”
<Processing aid>
Stearic acid: "Lunac S-50V" manufactured by Kao Corporation
<Crosslinking accelerator>
・ Zinc oxide: “3 types of zinc oxide” manufactured by Sakai Chemical Industry Co., Ltd.
<Crosslinking accelerator>
・ Dibenzothiazyl sulfide (MBTS): “Noxeller DM” manufactured by Ouchi Shinko Chemical Industry Co., Ltd.
-N-cyclohexyl-2-benzothiazolylsulfenamide (CBS): "Noxeller CZ" manufactured by Ouchi Shinkagaku Kogyo Co., Ltd.
・ Zinc dibutyldithiocarbamate (ZnBDC): “Noxeller BZ” manufactured by Ouchi Shinko Chemical Industry Co., Ltd.

Table 2 (Examples 6 to 10 and Comparative Example 3, rubber component: EPDM)
<Rubber component>
・ “EPT4045” manufactured by Mitsui Chemicals, Inc.
<Oil>
・ Idemitsu Kosan “Diana Process Oil PW-90”
<Crosslinking accelerator>
・ Dipentamethylenethiuram tetrasulfide (DPTT): “Noxeller TRA” manufactured by Ouchi Shinko Chemical Co., Ltd.
-MBTS and ZnBDC are the same as Table 1.
<Filler>, <Crosslinking agent>, <Crosslinking aid>, <Processing aid> are the same as in Table 1.

Table 3 (Examples 11 to 14 and Comparative Example 4, rubber component: silicone (VMQ))
<Rubber component>
・ "TSE2277U" manufactured by Momentive Performance Materials Japan
<Crosslinking agent>
・ 2,5-dimethyl 2,5-di-tert-butylperoxyhexane: “TC-8” manufactured by Momentive Performance Materials Japan
<Filler>
-Glass wool is the same as in Table 1.

[Method for producing rubber molded article]
The raw materials shown in Tables 1 to 3 were mixed at the ratios shown in Tables 1 to 3 using an open roll to produce an uncrosslinked rubber composition (mixing step). Next, the uncrosslinked rubber composition was heated at 180 ° C. for 10 minutes using a press machine to produce a sheet having a thickness of 2 mm (a molding step and a crosslinking step).

[Evaluation method]
The rubber molded body was evaluated by hardness. The uncrosslinked rubber composition was evaluated by Mooney viscosity. The methods for measuring the hardness and Mooney viscosity are as follows.
<Hardness>
The measurement was performed according to JIS K6253 type A.
<Mooney viscosity>
Mooney viscosity was measured according to JIS K6300-1. For the measurement, the uncrosslinked rubber composition obtained in the mixing step was measured at 125 ° C. using MVM11 manufactured by M & K.

  Tables 1 to 3 show the measured hardness values, and Tables 1 and 2 show the measured Mooney viscosity values.

  As shown in Examples 1 to 5 and Comparative Example 1 in Table 1, by increasing the content of glass wool, the hardness of the produced rubber molded body could be increased. Further, as shown in Comparative Examples 1 and 2, when carbon black was contained as a filler, the hardness was increased by increasing the content, but the Mooney viscosity was also significantly increased. On the other hand, as shown in Examples 1 and 2 and Comparative Example 2, when glass wool was contained, the Mooney viscosity when a rubber molded body having almost the same hardness as Comparative Example 2 was obtained was about 24.2 to 24.4. The value was significantly lower than when the hardness was increased only with carbon black. Then, as shown in Example 5, when glass wool was contained so as to have almost the same Mooney viscosity as that of Comparative Example 2, the hardness of the obtained rubber molded product was compared with the case where the hardness was increased by carbon black alone. Significantly higher. From the above results, by using glass wool as a filler, compared to the case where only carbon black is contained, while suppressing that the Mooney viscosity of the uncrosslinked rubber composition during production is significantly increased, the hardness is increased. It was confirmed that the obtained rubber molded body was obtained. Conventionally, in order to suppress the increase in Mooney viscosity while increasing the hardness, the type and the mixing ratio of the rubber component were adjusted, so that the selection range of the rubber component was narrowed. However, by using glass wool as the filler, the selection range of the rubber component can be expanded.

  The rubber component in Table 1 is SBR, but as shown in Tables 2 and 3, a rubber prepared by including glass wool in EPDM and silicone rubber, which is widely used as a rubber component of a rubber molded product. It was confirmed that the hardness of the molded body could be increased. Further, as shown in Table 2, even when EPDM was used as the rubber component, the Mooney viscosity of the uncrosslinked rubber composition could be prevented from being significantly increased even when the content of glass wool was increased, similarly to SBR. .

  By using glass wool as a filler, the hardness of the produced rubber molded article can be increased, but the increase in the Mooney viscosity of the uncrosslinked rubber composition at the time of production can be suppressed as compared with the case where carbon black is used. Therefore, it is useful in the field of rubber molded articles.

Claims (10)

Base resin, and at least including glass wool,
The base resin is a rubber component,
Rubber molding. The content of the glass wool is 1 to 100 parts by weight, based on 100 parts by weight of the base resin,
The rubber molded product according to claim 1.   The rubber molded product according to claim 1 or 2, wherein the rubber molded product is a foamed rubber containing air bubbles.   A sealing material comprising the rubber molded product according to claim 1.   An automotive component comprising the rubber molded product according to claim 1. Base resin, and, at least including grouse wool,
The base resin is a rubber component,
Uncrosslinked rubber composition. Further comprising a crosslinking agent and / or a foaming agent;
An uncrosslinked rubber composition according to claim 6. Mixing step of mixing an uncrosslinked rubber composition containing at least a base resin, glaous wool, and a crosslinking agent,
A molding step of molding the uncrosslinked rubber composition mixed in the mixing step,
A crosslinking step of crosslinking the uncrosslinked rubber composition molded in the molding step,
At least
The base resin is a rubber component,
A method for producing a rubber molded body. The content of the glass wool is 1 to 100 parts by weight, based on 100 parts by weight of the base resin,
A method for producing a rubber molded article according to claim 8. The uncrosslinked rubber composition further comprises a foaming agent,
A method for producing a rubber molded body according to claim 8.