WO2018074465A1

WO2018074465A1 - Rubber molded body, sealant, automobile component, uncrosslinked rubber composition, and method for producing rubber molded body

Info

Publication number: WO2018074465A1
Application number: PCT/JP2017/037510
Authority: WO
Inventors: 鉦則藤田; 貴士南保
Original assignee: 鉦則藤田
Priority date: 2016-10-18
Filing date: 2017-10-17
Publication date: 2018-04-26
Also published as: JP2019218413A

Abstract

The present invention addresses the problem of suppressing the increase of the Mooney viscosity of an uncrosslinked rubber composition during production in comparison with a case where carbon black is used, while the hardness of the rubber molded body can be increased. Provided is a rubber molded body comprising at least a base resin and grass wool, the base resin being a rubber component.

Description

Rubber molded body, sealing material, automotive part, uncrosslinked rubber composition, and method for producing rubber molded body

The present application relates to a rubber molded body, a sealing material, an automotive part, an uncrosslinked rubber composition, and a method for producing the rubber molded body.

Rubber moldings have long been used for sealing materials such as joint seals, gaskets, and weather strips for automobiles. Various fillers are added to the rubber molded body depending on 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 moldings 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 body depending on the application, and the type and amount of filler to be added are adjusted depending on the application. When carbon black is used as a filler, the hardness of the rubber molded body can be increased by increasing the amount of addition. However, since the Mooney viscosity increases when carbon black is added, there is a problem that it is difficult to extrude the mixed material from the nozzle when manufacturing a rubber molded body.

The present application has been made to solve the above problems, and as a result of extensive research, it is possible to increase the hardness of the manufactured rubber molded body by including glass wool when manufacturing the rubber molded body. Thus, it has been newly found that the Mooney viscosity during production can be suppressed as compared with carbon black.

That is, this application aims at providing the manufacturing method of the rubber molding containing glass wool, a sealing material, the components for motor vehicles, an unbridged rubber composition, and a rubber molding.

The present application relates to a rubber molded body, a sealing material, an automotive part, an uncrosslinked rubber composition, and a method for producing a rubber molded body, which will be described below.

(1) includes at least a base resin and glass wool,
The base resin is a rubber component;
Rubber molded body.
(2) The glass wool content is 1 to 100 parts by weight with respect to 100 parts by weight of the base resin.
The rubber molding as described in said (1).
(3) The rubber molded body according to (1) or (2), wherein the rubber molded body is a foam rubber containing bubbles.
(4) A sealing material comprising the rubber molded body described in (1) to (3) above.
(5) An automotive part comprising the rubber molded body described in (1) to (3) above.
(6) includes at least a base resin and grouse 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, grouse 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,
Including at least
The base resin is a rubber component;
A method for producing a rubber molded body.
(9) The glass wool content is 1 to 100 parts by weight with respect to 100 parts by weight of the base resin.
The manufacturing method of the rubber molding as described in said (8).
(10) The uncrosslinked rubber composition further includes a foaming agent.
The manufacturing method of the rubber molding as described in said (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 with 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 body, a sealing material, an automotive part, an uncrosslinked rubber composition, and a method for producing the rubber molded body will be described in detail.

Rubber molded body
(1) A mixing step of mixing an uncrosslinked rubber composition containing at least a base resin, grouse wool, and a crosslinking agent,
(2) A molding step for 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,
It can manufacture with the manufacturing method containing at least. Below, each raw material is demonstrated.

<Rubber component>
The base resin is composed of a rubber component. If a rubber component is a component generally used for the rubber molding, there will be no restriction | limiting in particular. For example, ethylene-propylene rubber, that is, EPDM (rubber-like copolymer of ethylene, propylene and diene) or EPM (rubber-like copolymer of ethylene and propylene) can be mentioned. EPDM is a copolymer of ethylene, propylene, and a third component having an unsaturated bond in the side chain. Specifically, the third component is 5-ethylidene-2-norbornene (ENB). ENB-based EPDM, and DCP-based EPDM whose 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 in combination of two or more components.

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

Glass wool is manufactured by rotating a spinner having a large number of small holes of about 1 mm around it and jetting molten glass. This production process is generally called a centrifugal method, and fine glass wool of about 1 to 7 μm can be economically produced by adjusting the viscosity and rotation speed of molten glass. Glass wool can be produced by the above method, but a commercially available product may be used. The fiber length of 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, a glass wool fiber length crushed to about 300 μm to 50 mm may be used. Moreover, as a glass component for forming glass wool, components, such as well-known E glass, C glass, A glass, S glass, D glass, NE glass, T glass, H glass, Q glass, quartz glass, are mentioned. .

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

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

The surface treatment of glass wool can be performed by dissolving the above silane coupling agent in a solvent and spraying and drying the 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%, and more preferably 0.24 wt%.

Glass wool may be surface treated with a lubricant. The lubricant is not particularly limited as long as it can be easily slipped into the rubber component when the glass wool is mixed with the rubber component. For example, a conventionally used lubricant such as silicon oil can be used, and calixarene is particularly preferable. Since silicone is an oil, it has poor affinity with the rubber component, but calixarene is a phenolic resin, so it improves slipping of glass wool while having excellent affinity with the rubber component. The rubber component can be filled while maintaining the 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, but for example, a plastic modifier nanodaX (registered trademark) manufactured by Nanodax Corporation 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 above silane coupling agent or lubricant, or may be treated with a silane coupling agent and a lubricant.

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

The glass wool content in the rubber molded body and the glass wool content in the mixing step of mixing the uncrosslinked rubber composition in the method for producing the rubber molded body are within a range where the hardness of the produced rubber molded body can be increased. If it is in, there will be no restriction | limiting in particular. As shown in Examples and Comparative Examples described later, the hardness increases as the glass wool content is increased. Therefore, since the hardness increases if glass wool is contained, the glass wool is 1 part by weight, 3 parts by weight, 5 parts by weight, 10 parts by weight, etc. with respect to 100 parts by weight of the base resin. What is necessary is just to contain the quantity from which the hardness of this is obtained. On the other hand, in comparison with carbon black, it is suppressed that the Mooney viscosity of the uncrosslinked rubber composition at the time of manufacture is high, but if the glass wool content is too high, the Mooney viscosity of the uncrosslinked rubber composition at the time of manufacture is high. 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 glass wool content in the rubber molded body and the glass wool content in the mixing step of mixing the uncrosslinked rubber composition in the rubber molded body manufacturing method are as described above, but before the mixing step is carried out. In the step of blending these various materials, an uncrosslinked rubber composition (masterbatch) containing more glass wool may be used. In a mixing process, it can be set as content of the expected glass wool in a mixing process by mixing the rubber component which does not contain a masterbatch and glass wool. The glass wool content of the uncrosslinked rubber composition used as the master batch is preferably as long as it can be contained in the rubber component as the base resin. The uncrosslinked rubber composition used as a masterbatch only needs to contain a rubber component as a base resin and glass wool, but may further contain 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. A typical example of the crosslinking agent is sulfur, but an organic peroxide can also be used. The addition amount of the crosslinking agent may be 0.1 to 5 parts by weight with respect to 100 parts by weight of the rubber component. When the content of the crosslinking agent is less than 0.1 parts by weight with respect to 100 parts by weight of the rubber component, the rubber component is not accurately crosslinked, and various physical properties of the resulting rubber molded article are deteriorated. On the other hand, when it exceeds 5 parts by weight, the degree of crosslinking is too high, which causes a decrease in various physical properties of the rubber molded body.

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

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

The addition amount of the foaming agent can be appropriately adjusted in consideration of the specific gravity of the foam rubber to be obtained, the amount of gas generated from the foaming agent, etc., but it should be 1-5 parts by weight with respect to 100 parts by weight of the rubber component. That's fine. If the content of the foaming agent is less than 1 part by weight with respect to 100 parts by weight of the rubber component, the effect of reducing the weight is difficult to obtain.

<Filler>
In various embodiments, the hardness of the rubber molded body produced by including glass wool is increased, but conventionally used fillers may be used in combination as long as the effects are 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. What is necessary is just to add a filler in the case of a mixing process.

<Other additives>
Further, the rubber molded body may contain other additives such as a softening agent, a crosslinking accelerator, a crosslinking accelerator, a processing aid, a thermoplastic resin, and a pigment as necessary. The softening agent is for facilitating kneading when the rubber component and the additive are mixed, and examples thereof include paraffinic oil. Examples of the crosslinking accelerator include thiuram, dithiocarbamine, thiazole, sulfenamide, and guanidine compounds. Examples of the crosslinking accelerating aid include zinc oxide. Examples of the processing aid include stearic acid. The thermoplastic resin is used to adjust the hardness of the rubber molded body, and examples thereof include polyethylene. In addition, resin components other than the base resin (rubber component) (thermoplastic resin, lubricant calixarene (thermosetting resin), film forming agent (thermosetting and photocurable resin)) in the rubber molded body When there is too much content, the function as a rubber molding will fall, such as a fall of elastic performance. Accordingly, when a resin component other than the base resin is added, the amount is desirably 30 parts by weight or less with respect to 100 parts by weight of the rubber component. These various additives may add only 1 type and can also mix 2 or more types. The additive may be added during the mixing step.

The rubber molded body is formed into an expected shape by extruding while crosslinking the uncrosslinked rubber composition mixed in the mixing step at a predetermined temperature, or by forming it into a predetermined shape using a mold or the like and then heating it. be able to. That is, the molding step and the crosslinking step may be performed simultaneously or separately. Specific examples of the molding method include compression molding, injection molding, extrusion molding, extrusion laminate molding, calendar molding, injection molding, and transfer molding, but other methods may be used. Further, the rubber molded body can include glass wool only in an intended portion of the rubber molded body by co-extrusion of an uncrosslinked rubber composition containing glass wool and an uncrosslinked rubber composition not containing glass wool. . In that case, the hardness of a desired portion of one rubber molded body can be changed.

The specific use of the rubber molded body may be a product in which a rubber molded body has been conventionally used. For example, automotive parts, marine parts, civil engineering parts, medical parts, electric / electronic devices. It is suitably used for automotive 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 and adhesives.

Automotive parts include, for example, glass run channels, weatherstrip sponges, door opening trims, sealing materials, tires, grommets, automobile engine gaskets, electrical components or oil filter sealing materials; igniter HIDs or automotive hybrid IC potting materials Coating materials for automobile bodies, automobile window glass, engine control substrates; gaskets such as oil pans or timing belt covers, moldings, headlamp lenses, sunroof seals, and adhesives for mirrors. Examples of weather strip sponges include door weather strips, trunk weather strips, luggage weather strips, roof side rail weather strips, sliding door weather strips, ventilator weather strips, sliding roof weather strips, front window weather strips, rear window weather strips, Examples include a quarter window weather strip, a lock pillar weather strip, a door glass outer weather strip, and a door glass inner weather strip.

Ship parts include, for example, wiring connection branch boxes, electrical system parts or electric wire sealing materials; electric wires or glass adhesives.

Civil engineering building parts include, for example, joint joints for glass screens in commercial buildings, joints around glass with sashes, interior joints in toilets, washrooms or showcases, joints around bathtubs, and for prefabricated houses Sealant for building materials used for joints on outer wall expansion joints and sizing boards; Sealant for double-glazed glass; Sealant for civil engineering used for road repairs; Paints and adhesives for metal, glass, stone, slate, concrete or tile An adhesive sheet, a waterproof sheet, or a vibration-proof sheet.

Examples of medical parts include medical rubber stoppers, syringe gaskets, and decompression blood vessel rubber stoppers.

Examples of parts for electrical / electronic equipment include heavy electrical parts, weak electrical parts, electrical / electronic equipment circuits and circuit board sealing materials, potting materials, coating materials or adhesives; electric wire covering repair materials; electric wire joint parts insulation Examples include sealing materials; rolls for OA equipment; vibration absorbers; grommets; or gel or capacitor encapsulants.

Examples of parts for transport aircraft include parts such as automobiles, ships, airplanes, and railway vehicles.

Leisure parts include, for example, swimming members such as swimming caps, diving masks and earplugs; and gel cushioning members such as sports shoes and baseball gloves.

Anti-vibration rubber includes, for example, automotive anti-vibration rubber (engine mount, liquid seal 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, sliding bush, cushion strut bar, stopper, handle damper, radiator supporter or muffler hanger) , Anti-vibration rubber for railway (slab mat, ballast mat or track mat), anti-vibration rubber for industrial machinery (expansion joint, flexible Bull joint, bush, mount) and the like.

Examples of the sheet include a roofing sheet and a water stop sheet.

Various belts include power 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) Belt, V-type guided conveyor belt) and the like.

As the sealing material, for example, a sealing material for a refrigerator, a freezer, a washing machine, a gas meter, a microwave oven, a steam iron, and an electric leakage breaker is preferably exemplified. The sealing material refers to a material to be sealed (sealed or sealed). Further, in various industries such as machinery, electricity, chemistry, etc., a material used for the purpose of watertightness and airtightness of the joint portion and the contact portion is also a broad meaning sealing material.

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 resistance section, an electrical insulation component, a semiconductive component, a conductive component, a solar cell, or a television flyback transformer.

Examples of coating materials include various circuit elements such as high voltage thick film resistors or hybrid ICs; electrical insulation components; semiconductive components; conductive components; modules; printed circuits; ceramic substrates; diodes, transistors, bonding wires, etc. Examples thereof include a material for coating a buffer material; a semiconductive element; or an optical fiber for optical communication.

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

In addition to the above, rubber moldings are used for automobile cups and seals (master cylinder piston cups, wheel cylinder piston cups, constant velocity joint boots, pin boots, dust covers, piston seals, packings, O-rings, diaphragms, dam window shields, Door mirror bracket, seal head lamp, seal cowl top), industrial sealing material (capacitor packing, O-ring, packing), foam (hose protection sponge, cushion sponge, heat insulation sponge, insulation pipe), covered electric wire, Electric wire joints, electrical insulation parts, semiconductive rubber parts, OA equipment rolls (charging rolls, transfer rolls, developing rolls, paper feed rolls), industrial rolls (iron rolls, paper rolls, printing electric rolls), anode caps , Plastic 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 with reference to examples, but these examples are provided merely for reference of specific embodiments. These illustrations are not meant to limit or limit the scope of the invention.

[Raw material and compounding ratio]
The raw materials and blending ratios of the rubber molded bodies produced 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 "JSR SL552"
<Filler>
・ Carbon black: "Asahi # 60" manufactured by Asahi Carbon
Glass wool: Glass wool was produced by a centrifugal method. The fiber diameter was about 2-6 μm. The surface treatment of glass wool was performed by spraying a solution containing a silane coupling agent from a binder nozzle onto glass wool fiberized 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 with respect to glass wool was 0.24 wt%. The glass wool was dried at 150 ° C. for 1 hour and then pulverized to an average fiber length of 850 μm by a cutter mill.

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

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

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

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

[Evaluation methods]
The rubber molded body was evaluated by hardness. The uncrosslinked rubber composition was evaluated by Mooney viscosity. The measuring method of hardness and Mooney viscosity is as follows.
<Hardness>
Measured according to JIS K6253 A type.
<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.

The measured hardness values are listed in Tables 1 to 3, and the measured Mooney viscosity values are listed in Tables 1 and 2.

As shown in Examples 1 to 5 and Comparative Example 1 in Table 1, the hardness of the produced rubber molded body could be increased by increasing the glass wool content. 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 is contained, the Mooney viscosity when a rubber molded body having substantially the same hardness as Comparative Example 2 is obtained is about 24.2 to 24.4. Thus, the value was significantly lower than when the hardness was increased only with carbon black. And as shown in Example 5, when glass wool was included so as to have the same Mooney viscosity as in Comparative Example 2, the hardness of the obtained rubber molded body was compared with the case where the hardness was increased with carbon black alone. Can be significantly higher. From the above results, by using glass wool as a filler, the hardness is increased while suppressing the Mooney viscosity of the uncrosslinked rubber composition at the time of production from being significantly higher than when only carbon black is contained. It was confirmed that an obtained rubber molded body was obtained. Conventionally, in order to suppress the increase in Mooney viscosity while increasing the hardness, the rubber component selection range has been narrowed because the type and blending ratio of the rubber component have been adjusted. However, the selection range of the rubber component can be expanded by using glass wool as a filler.

Moreover, although the rubber component of Table 1 is SBR, as shown in Table 2 and Table 3, the rubber | gum produced by containing glass wool also in EPDM and silicone rubber widely used as a rubber component of a rubber molding. 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, it was possible to suppress the Mooney viscosity of the uncrosslinked rubber composition from becoming extremely high even when the glass wool content was increased, as in SBR. .

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

Claims

Including at least a base resin and glass wool,
The base resin is a rubber component;
Rubber molded body.
The glass wool content is 1 to 100 parts by weight with respect to 100 parts by weight of the base resin.
The rubber molded body according to claim 1.
The rubber molded body according to claim 1 or 2, wherein the rubber molded body is a foam rubber containing bubbles.
A sealing material comprising the rubber molded body according to claim 1.
An automotive part comprising the rubber molded body according to claim 1.
Including at least base resin and grouse wool,
The base resin is a rubber component;
Uncrosslinked rubber composition.
Further comprising a crosslinking agent and / or a foaming agent,
The uncrosslinked rubber composition according to claim 6.
A mixing step of mixing an uncrosslinked rubber composition containing at least a base resin, grouse 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,
Including at least
The base resin is a rubber component;
A method for producing a rubber molded body.
The glass wool content is 1 to 100 parts by weight with respect to 100 parts by weight of the base resin.
The manufacturing method of the rubber molding of Claim 8.
The uncrosslinked rubber composition further comprises a foaming agent;
The manufacturing method of the rubber molding of Claim 8 or 9.