WO2022113896A1 - ゴム組成物、該ゴム組成物の加硫物、および該ゴム組成物の加硫成形体 - Google Patents
ゴム組成物、該ゴム組成物の加硫物、および該ゴム組成物の加硫成形体 Download PDFInfo
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- WO2022113896A1 WO2022113896A1 PCT/JP2021/042561 JP2021042561W WO2022113896A1 WO 2022113896 A1 WO2022113896 A1 WO 2022113896A1 JP 2021042561 W JP2021042561 W JP 2021042561W WO 2022113896 A1 WO2022113896 A1 WO 2022113896A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L11/00—Compositions of homopolymers or copolymers of chloroprene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/14—Peroxides
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/54—Silicon-containing compounds
- C08K5/541—Silicon-containing compounds containing oxygen
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/54—Silicon-containing compounds
- C08K5/541—Silicon-containing compounds containing oxygen
- C08K5/5415—Silicon-containing compounds containing oxygen containing at least one Si—O bond
- C08K5/5419—Silicon-containing compounds containing oxygen containing at least one Si—O bond containing at least one Si—C bond
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/2224—Magnesium hydroxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/267—Magnesium carbonate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/006—Additives being defined by their surface area
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/54—Silicon-containing compounds
- C08K5/541—Silicon-containing compounds containing oxygen
- C08K5/5425—Silicon-containing compounds containing oxygen containing at least one C=C bond
Definitions
- Chloroprene-based rubber has excellent mechanical properties, ozone resistance, and chemical resistance, and is used in a wide range of fields such as automobile parts, adhesives, and various industrial rubber parts by taking advantage of its properties.
- the performance required for rubber parts has increased remarkably, and in addition to mechanical properties such as wear resistance and low heat generation in a dynamic environment, improvement of the vulcanization rate is also required to improve productivity. There is.
- Patent Document 1 As a technique for improving the brewing rate of rubber, as described in Patent Document 1, 5 to 200 parts by mass of silica and 1 part of silane coupling agent with respect to the mass of the silica with respect to 100 parts by mass of the diene rubber. 1 to 20% by mass of glycerin monofatty acid ester derived from a fatty acid having ⁇ 20% by mass and 8 to 24 carbon atoms and 0.1 to 10% by mass of a cyclic polysulfide represented by the following formula (1) with respect to the mass of the silica.
- a rubber composition characterized by blending by mass is known.
- the fraction of each monomer constituting the polymer is 100% by mass based on the total amount of all the monomers.
- 2-Chloro-1,3-butadiene (chloroprene) (C-1) 80-97% by mass and 2,3-dichloro-1,3-butadiene (C-2) 20-3% by mass.
- Copolymer or 2-chloro-1,3-butadiene (chloroprene) (C-1) 79.8-96.8% by mass, 2,3-dichloro-1,3-butadiene (C-2) 20- It is a copolymer composed of 3% by mass and 0.2 to 17% by mass of a monomer (C-3) copolymerizable with these, and the Mooney viscosity (ML1 + 4 (100 ° C.)) of the polymer is 100 to 100.
- chloroprene 2-chloro-1,3-butadiene
- C-2 2,3-dichloro-1,3-butadiene
- chloroprene-based vulcanized rubber polymer 100 parts by mass of chloroprene-based vulcanized rubber polymer in the range of 135, 0.5 to 6 parts by mass of acid receiving agent, 0.2 to 3 parts by mass of lubricant, 1 to 5 parts by mass of antioxidant, and 10 to 10 parts of carbon black. 120 parts by mass, 0.1 to 20 parts by mass of filler other than carbon black, 2 to 40 parts by mass of softener, 0.2 to 5 parts by mass of processing aid, 0.5 to 10 parts by mass of metal oxide, and addition.
- a composition for a chloroprene-based vulcanized rubber containing 0.5 to 5 parts by mass of a sulfurization accelerator is known.
- silica having more than 0 parts by mass and 100 parts by mass or less is used for a total of 100 parts by mass of rubber components containing two or more types of diene rubber.
- the diene rubber is divided into two or more phases having different glass transition temperatures, of which at least one phase has a continuous structure and at least one phase has a glass transition point of ⁇ 50 ° C. or higher. More than 80% by weight of the amount of silica per unit volume of the blended rubber is contained in at least one phase having a glass transition point of ⁇ 50 ° C. or higher, and the average aggregate aggregate area of silica contained in the phase is A rubber composition characterized by having a rubber composition of 2000 nm 2 or less is known.
- a rubber composition containing a chloroprene polymer is required to have various properties in a vulcanized product of the rubber composition, and is required to have wear resistance and low heat generation in a dynamic environment. It may be required to provide a highly productive vulcanized product having an excellent vulcanization rate.
- One aspect of the present invention is 100 parts by mass of chloroprene-based rubber, 20 to 80 parts by mass of silica, 1 part by mass or more of hydrate, less than 20 parts by mass, and 0.3 to 1.4 parts by mass of organic peroxide.
- the present invention relates to a rubber composition containing 0.5 to 15 parts by mass of a silane coupling agent having a double bond in the structure with respect to 100 parts by mass of the silica.
- the chloroprene-based rubber is a homopolymer of 2-chloro-1,3-butadiene, or at least one monomer selected from 2,3-dichloro-1,3-butadiene and acrylonitrile and 2-. Contains a copolymer with chloro-1,3-butadiene.
- the silane coupling agent having a double bond in the structure is vinyltrimethoxysilane, vinyltriethoxysilane, 3- (meth) acryloxyloxypropylmethyldimethoxysilane, 3- (meth) acryloxipropylmethyltri.
- the hydrate is a hydrate that releases H2O in a temperature range of 100 ° C to 250 ° C.
- the hydrate is at least one hydrate selected from a hydrotalcite compound represented by the following chemical formula (1), a hydrous salt, and a metal hydroxide.
- the hydrate is Mg 4.3 Al 2 (OH) 12.6 CO 3.3.5H 2 O, Mg 3 ZnAl 2 (OH) 12 CO 3.3H 2 O, Mg 4.5 Al. 2 (OH) 13 CO 3.3.5H 2 O, Mg 4.5 Al 2 (OH) 13 CO 3 , Mg 4 Al 2 (OH) 12 CO 3.3.5H 2 O, Mg 6 Al 2 ( OH) ) 16 CO 3.4H 2 O, Mg 5 Al 2 (OH) 14 CO 3.4H 2 O, Mg 3 Al 2 (OH) 10 CO 3. 1.7H 2 O Selected from hydrotalcite compounds It is at least one kind of hydrate.
- the organic peroxide is dicumyl peroxide, 1,4-bis [(t-butylperoxy) isopropyl] benzene, t-butyl ⁇ -cumyl peroxide, 2,5-dimethyl-2,5-bis. It is at least one organic peroxide selected from (t-butylperoxy) hexane and 2,5-dimethyl-2,5-bis (t-butylperoxy) hexin-3.
- the silica has an adsorption specific surface area of cetyltrimethylammonium bromide (CTAB) of 50 to 300 m 2 / g.
- CTAB cetyltrimethylammonium bromide
- Another aspect of the invention relates to the vulcanized product of the rubber composition described above.
- Another aspect of the present invention relates to a vulcanized molded product of the above-mentioned rubber composition.
- the rubber composition according to the present embodiment includes (1) 100 parts by mass of chloroprene-based rubber, (2) 20 to 80 parts by mass of silica, and (3) 1 part by mass or more and less than 20 parts by mass of hydrate. (4) A silane coupling agent containing 0.3 to 1.4 parts by mass of an organic peroxide and having a double bond in the structure (5) by 0.5 to 15 parts by mass with respect to 100 parts by mass of silica. Partly contained.
- the rubber composition according to the present embodiment it is possible to obtain a vulcanized product having excellent wear resistance and low heat generation in a dynamic environment as a vulcanized product obtained by vulcanizing the rubber composition. can.
- the present inventor uses a specific amount of silica as a filler, and uses a specific amount of a silane coupling agent having a double bond in the structure according to the amount of silica.
- an organic peroxide as a vulcanizing agent and using a hydrate instead of magnesium oxide or the like, the vulcanization rate can be improved at the same time as well as physical properties such as wear resistance and low heat generation. I found.
- a specific amount of silica is used as the filler
- a specific amount of a silane coupling agent having a double bond in the structure is used according to the amount of silica
- an organic peroxide is used as the vulcanizing agent.
- the following can be considered as a mechanism for simultaneously improving the vulcanization rate as well as physical properties such as wear resistance and low heat generation by using and further using a hydrate.
- the double bond portion and the rubber portion of the silane coupling agent react with each other, and the wear resistance, low heat generation property, and reinforcing property of the obtained vulcanizer are improved. ..
- the protection of silica by the silane coupling agent is carried out by its own hydrolysis and the condensation reaction between the hydrolyzate and silica. Therefore, by adding the hydrate during processing in the same manner as the silane coupling agent, the hydrated water ( H2O ) is released from the hydrate by the heat generated during the kneading, and this is released.
- the added water promotes the hydrolysis of the silane coupling agent, strengthens the protection against silica, and contributes to the improvement of reinforcing properties.
- H2O produced by the desorption of hydrated water and the chlorine capture reaction of hydrochloric acid generated from chloroprene-based rubber promotes the decomposition of organic peroxides. It is presumed that the brewing rate is improved.
- Chloroprene-based rubber contains a chloroprene polymer as a main component.
- the chloroprene polymer is a homopolymer of 2-chloro-1,3-butadiene (hereinafter referred to as chloroprene), a copolymer of chloroprene with another monomer copolymerizable with chloroprene, or these. It is a mixture of polymers.
- examples of other monomers copolymerizable with chloroprene include esters of acrylic acids such as methyl acrylate, butyl acrylate, and 2-ethylhexyl acrylate, methyl methacrylate, butyl methacrylate, and methacrylate.
- esters of methacrylic acid such as 2-ethylhexyl, hydroxy (meth) acrylates such as 2-hydroxyethyl (meth) acrylate, 2-hydroxymethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2,3-
- hydroxy (meth) acrylates such as 2-hydroxyethyl (meth) acrylate, 2-hydroxymethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2,3-
- dichloro-1,3-butadiene 1-chloro-1,3-butadiene, butadiene, isoprene, ethylene, styrene, acrylonitrile and the like.
- the other monomer copolymerizable with chloroprene preferably contains at least one monomer selected from 2,3-dichloro-1,3-butadiene and acrylonitrile.
- the amount of copolymerization of the other monomer is preferably 50 parts by mass with respect to 100 parts by mass of chloroprene.
- the amount is preferably 30 parts or less, more preferably 30 parts by mass or less.
- the chloroprene-based rubber according to one embodiment of the present invention is a homopolymer of 2-chloro-1,3-butadiene, or at least one single selected from 2,3-dichloro-1,3-butadiene and acrylonitrile. It is preferable to contain a copolymer of a weight and 2-chloro-1,3-butadiene. Further, the chloroprene-based rubber according to one embodiment of the present invention is at least selected from a homopolymer of 2-chloro-1,3-butadiene and / or 2,3-dichloro-1,3-butadiene and acrylonitrile.
- the chloroprene-based rubber according to the embodiment of the present invention may also be made of a homopolymer of 2-chloro-1,3-butadiene.
- the other monomer copolymerized with chloroprene is not limited to one type, and may be, for example, a copolymer of three or more types of monomers containing chloroprene. Further, the polymer structure of the polymer is not particularly limited.
- the chloroprene-based rubber is obtained by emulsion polymerization of a raw material monomer containing chloroprene as a main component in the presence of a polymerization reaction catalyst, a polymerization initiator, a chain transfer agent, etc., using rosin or the like as an emulsion dispersant. Be done.
- Examples of the catalyst for the polymerization reaction include inorganic peroxides such as potassium sulfate, ketone peroxides, peroxyketals, hydroperoxides, dialkyl peroxides, and organic peroxides such as diacyl peroxides. ..
- Examples of the catalytic activator include sodium sulfite, potassium sulfite, iron (II) oxide, anthraquinone, sodium ⁇ -sulphonate, formamidine sulphonic acid, L-ascorbic acid and the like.
- the polymerization initiator is not particularly limited, and known polymerization initiators generally used for emulsion polymerization of chloroprene monomers, such as potassium persulfate, ammonium persulfate, sodium persulfate, hydrogen peroxide, and t-butyl hydroperoxide, etc. Is used.
- the chain transfer agent is also not particularly limited, and those used for ordinary emulsion polymerization of chloroprene can be used. Specifically, long-chain alkyl mercaptans such as n-dodecyl mercaptan, t-dodecyl mercaptan, and n-octyl mercaptan, xanthogen compounds such as diisopropylxantogen disulfide and diethylxanthogen disulfide, iodoform, and benzyl1-pyrrole dithiocarbamate (also known as benzyl).
- long-chain alkyl mercaptans such as n-dodecyl mercaptan, t-dodecyl mercaptan, and n-octyl mercaptan
- xanthogen compounds such as diisopropylxantogen disulfide and diethylxanthogen disulf
- Cyanobut-2-yl-1-pyrrolecarbodithioate benzyl-1-imidazole dithiocarbamate (also known as benzyl-1-imidazolecarbodithioate), 2-cyanoprop-2-yl-N, N-dimethyldithiocarbamate, benzyl -N, N-diethyldithiocarbamate, cyanomethyl-1- (2-pyrrolidone) dithiocarbamate, 2- (ethoxycarbonylbenzyl) prop-2-yl-N, N-diethyldithiocarbamate, 1-phenylethyldithiobenzoate, 2 -Phenylprop-2-yldithiobenzoate, 1-acetic acid-1-yl-ethyldithiobenzoate, 1- (4-methoxyphenyl) ethyldithiobenzoate, benzyldithioacetate, ethoxycarbonyl
- the polymerization temperature of the chloroprene latex is not particularly limited, and can be generally in the range of 0 to 50 ° C., preferably 20 to 50 ° C., at which emulsion polymerization is carried out.
- the final polymerization rate of the chloroprene-based rubber obtained in the above-mentioned polymerization step is not particularly limited, but is preferably arbitrarily adjusted within the range of 30 to 100%.
- the polymerization may be stopped by adding a polymerization inhibitor that stops the polymerization reaction when the desired conversion rate is reached.
- the polymerization terminator is not particularly limited, and commonly used ones can be used. Specifically, there are thiodiphenylamine, 4-tert-butylcatechol, 2,2-methylenebis-4-methyl-6-tert-butylphenol and the like.
- the unreacted monomer is removed from the polymerization solution obtained by the polymerization step.
- the method is not particularly limited, and for example, there is a steam stripping method. After that, the pH is adjusted, and a chloroprene-based rubber is obtained through conventional steps such as freeze-coagulation, washing with water, and hot air drying.
- Silica Silica is added to the rubber composition as a filler and is not particularly limited, but for example, wet silica (hydrous silicic acid), dry silica (anhydrous silicic acid), and colloidal silica are used. be able to. In the rubber composition of the present invention, the use of wet silica is particularly preferable.
- silica having a CTAB (cetyltrimethylammonium bromide) adsorption specific surface area of 50 to 300 m 2 / g, particularly 80 to 250 m 2 / g.
- CTAB cetyltrimethylammonium bromide
- Examples of silica include NipSil (nip seal) AQ (CTAB adsorption specific surface area 187 m 2 / g) manufactured by Tosoh Silica Co., Ltd.
- the CTAB adsorption specific surface area of silica is a value obtained by measuring the amount of CTAB adsorbed on the silica surface according to JIS K6217-3: 2001 "Part 3: How to obtain the specific surface area-CTAB adsorption method". be.
- the amount of silica added is 20 to 80 parts by mass, preferably 30 to 70 parts by mass, and more preferably 40 to 60 parts by mass with respect to 100 parts by mass of the chloroprene rubber.
- the amount of silica added can be, for example, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80 parts by mass, and any two of the numerical values exemplified here. It may be within the range between the two.
- the hydrate preferably has a structure in which H2O is released during, for example, kneading and vulcanization.
- the hydrate is more preferably a hydrate that releases H2O in a temperature range of 100 ° C to 250 ° C, and a hydrate that releases H2O in a temperature range of 100 ° C to 150 ° C. Is more preferable.
- the reaction between the silane coupling agent and silica is promoted, and good physical properties and vulcanization rate can be obtained.
- the hydrate is not particularly limited, and those used in commercially available rubber compositions can be used.
- hydrotalcite compounds represented by the following chemical formula (1), hydrous salts, and metal hydroxides can be used. Can be used.
- M 2+ At least one divalent metal ion selected from Mg 2+ , Zn 2+ , etc.
- M 3+ At least one trivalent metal ion selected from Al 3+ , Fe 3+ , etc.
- Ann ⁇ CO 3 2- , Cl ⁇ , At least one anion selected from NO 3 - etc.
- X 0 ⁇ X ⁇ 0.33 Can be.
- Hydrotalcite compounds include Mg 4.3 Al 2 (OH) 12.6 CO 3.3.5H 2 O, Mg 3 ZnAl 2 (OH) 12 CO 3.3H 2 O, Mg 4.5 Al 2 (Mg 4.5 Al 2 ). OH) 13 CO 3 ⁇ 3.5H 2 O, Mg 4.5 Al 2 (OH) 13 CO 3 , Mg 4 Al 2 (OH) 12 CO 3 ⁇ 3.5H 2 O, Mg 6 Al 2 (OH) 16 CO 3.4H 2 O, Mg 5 Al 2 (OH) 14 CO 3.4H 2 O, Mg 3 Al 2 (OH) 10 CO 3.1.7H 2 O , etc. are mentioned , and Mg 4. 3 Al 2 (OH) 12.6 CO 3.3H 2 O, Mg 3 ZnAl 2 (OH) 12 CO 3.3H 2 O.
- hydrous salt Al 2 O 3.3H 2 O, Al 2 O 3 ⁇ H 2 O, Na 2 SO 4 ⁇ 10H 2 O, CaSO 4.2H 2 O, NaHCO 3 ⁇ Na 2 CO 3.2H 2 O, Examples thereof include silyl 4.7H 2 O, and Al 2 O 3.3H 2 O is particularly preferable.
- hydroxide examples include Ca (OH) 2 , Al (OH) 3 , Mg (OH) 2 , Zn (OH) 2 , and the like, and Mg (OH) 2 is particularly preferable.
- the amount of the hydrate added is 1 part by mass or more and less than 20 parts by mass, preferably 2 parts by mass or more and less than 20 parts by mass, and more preferably 4 to 10 parts by mass with respect to 100 parts by mass of the chloroprene rubber. It is a mass part.
- the amount of hydrate added is, for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, and 19 parts by mass. It may be within the range between any two of the numerical values exemplified here. By using the hydrate in this range, a rubber composition having excellent wear resistance and low heat generation can be obtained.
- Organic peroxide is added to the rubber composition as a sulfide aid and is not particularly limited, but for example, dicumyl peroxide, benzoyl peroxide, 1, 1 -Bis (t-butylperoxy) -3,5,5-trimethylcyclohexane, diisobutyryl peroxide, cumylperoxyneodecanoate, di-n-propylperoxydicarbonate, diisopropylperoxydicarbonate, di- sec-butyl peroxydicarbonate, 1,1,3,3-tetramethylbutylperoxyneodecanoate, di (4-t-butylcyclohexyl) peroxydicarbonate, di (2-ethylhexyl) peroxydi Carbonate, t-hexyl peroxyneodecanoate, t-butylperoxyneodecanoate, t-butylperoxyneohept
- dicumyl peroxide, 1,4-bis [(t-butylperoxy) isopropyl] benzene, t-butyl ⁇ -cumyl peroxide, 2,5-dimethyl-2,5-bis (t-butylperoxy) ) Hexane, 2,5-dimethyl-2,5-bis (t-butylperoxy) Hexane-3 is preferably at least one selected, and particularly preferably 1,4-bis [(t-butylperoxy). ) Isopropyl] benzene.
- the amount of the organic peroxide added is 0.3 to 1.4 parts by mass, preferably 0.4 to 1.3 parts by mass, and particularly preferably 0.4 to 0.4 parts by mass with respect to 100 parts by mass of the chloroprene-based rubber. 1.2 parts by mass.
- the amount of the organic peroxide added is, for example, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2. , 1.3, 1.4 parts by mass, and may be within the range between any two of the numerical values exemplified here.
- the rubber composition according to the embodiment of the present invention is used to improve the dispersibility of silica in the rubber and the reinforcing effect between the rubber and the silica.
- a silane coupling agent having a double bond in the structure of 0.5 to 15 parts by mass with respect to 100 parts by mass of silica is used.
- the content of the silane coupling agent having a double bond in the structure is preferably 0.5 to 15 parts by mass, more preferably 0.5 to 10 parts by mass with respect to 100 parts by mass of silica. preferable.
- the content of the silane coupling agent having a double bond in the structure is, for example, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 2, 3, 4, 5, 6 , 7, 8, 9, 10, 11, 12, 13, 14, and 15 parts by mass, and may be within the range between any two of the numerical values exemplified here.
- the silane coupling agent having a double bond in the structure is not particularly limited except that it has a double bond in the structure, and those used in commercially available rubber compositions can be used, for example, vinyl-based.
- vinyl-based coupling agents, methacrylic-based coupling agents, and acrylic-based coupling agents are preferable from the viewpoint of processability and reinforcing effect.
- the silane coupling agent having a double bond in the structure is more preferably having a (meth) acrylic group in the structure, and even more preferably having a methacrylic group.
- silane coupling agent having a double bond in the structure examples include vinyltrimethoxysilane, vinyltriethoxysilane, p-styryltrimethoxysilane, 3-acryloxypropyltrimethoxysilane, and 3- (metha).
- ) Acryloxypropylmethyldimethoxysilane, 3- (meth) acryloxypropylmethyltrimethoxysilane, 3- (meth) acryloxypropylmethyldiethoxysilane, 3- (meth) acryloxipropylmethyltriethoxysilane can.
- Silane is preferred.
- the rubber composition according to the embodiment of the present invention may also contain a silane coupling agent having no double bond in the structure.
- the content of the silane coupling agent having no double bond in the structure can be 0.5 to 15 parts by mass with respect to 100 parts by mass of silica. Further, the content of the silane coupling agent having no double bond in the structure is preferably smaller than the content of the silane coupling agent having a double bond in the structure.
- the content of the silane coupling agent having a double bond in the structure is high. It is preferably 50 parts by mass or more, more preferably 70 parts by mass or more, and even more preferably 90 parts by mass or more.
- the rubber composition according to one embodiment of the present invention may not contain a silane coupling agent having no double bond in the structure.
- a filler such as carbon black, a reinforcing material, a processing aid, an antiaging agent, or the like may be added as long as the effect of the present invention is not impaired.
- filler and the reinforcing material examples include carbon black, clay, talc, and calcium carbonate.
- the blending amount of these fillers and reinforcing materials can be added within a range that does not impair the heat resistance, and is preferably in the range of 5 to 100 parts by mass with respect to 100 parts by mass of the rubber composition.
- processing aid examples include fatty acids such as stearic acid, paraffin-based processing aids such as polyethylene, fatty acid amides, and the like, and up to 0.5 to 5 parts by mass can be added to 100 parts by mass of the rubber composition.
- anti-aging agent general anti-aging agents such as amine-based, imidazole-based, carbamic acid metal salt, phenol-based, and wax can be used.
- the antiaging agent species having a large effect of improving heat resistance include amine-based 4,4'-bis ( ⁇ , ⁇ -dimethylbenzyl) diphenylamine and octylated diphenylamine.
- 4,4'-bis ( ⁇ , ⁇ -dimethylbenzyl) diphenylamine has a great effect of improving heat resistance.
- the plasticizer is not particularly limited as long as it is a plasticizer compatible with chloroprene-based rubber, but for example, vegetable oils such as rapeseed oil, phthalate-based plasticizers, DOS, DOA, ester-based plasticizers, and ether-ester-based plasticizers.
- vegetable oils such as rapeseed oil, phthalate-based plasticizers, DOS, DOA, ester-based plasticizers, and ether-ester-based plasticizers.
- the amount of the plasticizer added is preferably 0 to 50 parts by mass with respect to 100 parts by mass of the rubber composition.
- the rubber composition according to one embodiment of the present invention is measured using an oscillation discreometer (No. 292 lotus reometer, manufactured by Toyo Seiki Seisakusho Co., Ltd.) in accordance with the Japan Rubber Association standard SRIS3102-1977.
- the vulcanization rate (T90-T10) calculated by measuring the vulcanization time (T90) at 160 ° C. ⁇ 60 minutes is preferably 25 minutes or less, more preferably 24 minutes or less. Even more preferably, it is 23 minutes or less.
- the rubber composition is obtained by kneading the above-mentioned compound at a temperature equal to or lower than the vulcanization temperature thereof.
- the kneading device include a mixer, a Banbury mixer, a kneader mixer, and a double roll.
- the vulcanized molded product of the rubber composition can be obtained by molding the above-mentioned rubber composition into various desired shapes and then vulcanizing it, or by vulcanizing the rubber composition and then molding it into various shapes. It is a thing.
- a method for molding a vulcanized molded product from a rubber composition there are methods such as press molding, extrusion molding, and calender molding.
- the temperature at which the rubber composition is vulcanized may be appropriately set according to the composition, and is usually in the range of 140 to 220 ° C, preferably 160 to 190 ° C. Further, the vulcanization time may be appropriately set depending on the composition and shape of the rubber composition, and is usually carried out in the range of 10 minutes to 60 minutes.
- the vulcanized molded product is obtained by vulcanizing and molding the above-mentioned rubber composition, has a good vulcanization rate, and is excellent in wear resistance and low heat generation.
- the vulcanized molded product according to the embodiment of the present invention has a ⁇ V of 80 mm 3 or less in an aclon wear test (1000 times wear, wear volume ⁇ V, unit: mm 3 ) according to JIS K 6264-2: 2019. It is preferably 76 mm 3 or less, and even more preferably 70 mm 3 or less.
- the vulcanized molded product is obtained by press-vulcanizing the rubber composition according to the embodiment of the present invention under the conditions of 160 ° C. ⁇ 40 minutes, and has a diameter of 63.6 mm, a thickness of 12.7 mm, and a center hole 12. It can be a vulcanized molded product of 0.7 mm.
- the vulcanized molded article according to the embodiment of the present invention conforms to JIS K 6265: 2019, and generates heat measured under the conditions of 40 ° C., strain of 0.175 inches, load of 55 pounds, and frequency of 1,800 times per minute.
- the amount ( ⁇ T) is preferably 35 ° C. or lower, more preferably 35 ° C. or lower, more preferably 33 ° C. or lower, still more preferably 30 ° C. or lower.
- the vulcanized molded product is obtained by press-vulcanizing the rubber composition according to the embodiment of the present invention under the conditions of 160 ° C. ⁇ 40 minutes to form a columnar body having a diameter of 15 mm and a height of 25 mm. Can be done.
- the chloroprene monomer is dispensed 20 seconds after the start of polymerization, the split flow rate is adjusted by an electromagnetic valve based on the change in the calorific value of the refrigerant for 10 seconds after the start of polymerization, and the flow rate is readjusted every 10 seconds thereafter. I went continuously. When the polymerization rate with respect to the total amount of the chloroprene monomer and the acrylonitrile monomer became 50%, 0.02 part by mass of phenothiazine, which is a polymerization inhibitor, was added to terminate the polymerization. Then, the unreacted monomer in the reaction solution was removed under reduced pressure to obtain a chloroprene-acrylonitrile copolymer latex.
- the above-mentioned polymerization rate [%] of the chloroprene-acrylonitrile copolymer latex was calculated from the dry mass of the chloroprene-acrylonitrile copolymer latex when it was air-dried. Specifically, it was calculated from the following formula (A).
- solid content concentration means the concentration of solid content excluding volatile components such as solvent (water), volatile chemicals, and raw materials by heating 2 g of sampled chloroprene-acrylonitrile copolymer latex at 130 ° C. [Mass%].
- the “total charge amount” is the total amount [g] of the raw materials, reagents and solvent (water) charged in the polymerization can from the start of the polymerization to a certain time.
- the “evaporation residue” is the mass [g] of the chemicals and raw materials charged from the start of polymerization to a certain time, which remain as solids together with the polymer without volatilizing under the condition of 130 ° C.
- the “monomer charging amount” is the total amount [g] of the monomers initially charged in the polymerization can and the monomers divided from the start of the polymerization to a certain time.
- the “monomer” here is the total amount of chloroprene and acrylonitrile.
- Polymerization rate ⁇ [(total charge amount x solid content concentration / 100) -evaporation residue] / monomer charge amount ⁇ x 100 ... (A)
- the pH of the above-mentioned chloroprene-acrylonitrile copolymer latex is adjusted to 7.0 using acetic acid or sodium hydroxide, and then the chloroprene-acrylonitrile copolymer latex is freeze-coagulated on a metal plate cooled to -20 ° C.
- the sheet was obtained by emulsifying and breaking. After washing this sheet with water, it was dried at 130 ° C. for 15 minutes to obtain a solid chloroprene-acrylonitrile copolymer rubber (chloroprene-acrylonitrile copolymer).
- a TSK guard column HHR-H was used as a pre-column, and three HSKgelGMHHR-H were used as an analysis column, and the sample pump pressure was 8.0 to 9.5 MPa, the flow rate was 1 mL / min, and the mixture was discharged at 40 ° C. Detected with a refractometer.
- the weight average molecular weight (Mw) of the chloroprene-acrylonitrile copolymer rubber is 473 ⁇ 10 3 g / mol
- the number average molecular weight (Mn) is 138 ⁇ 10 3 g / mol
- the molecular weight distribution (Mw / Mn) is 3. It was 0.4.
- the content of the monomer unit of acrylonitrile contained in the chloroprene-acrylonitrile copolymer rubber was calculated from the content of nitrogen atoms in the chloroprene-acrylonitrile copolymer rubber. Specifically, the content of nitrogen atoms in 100 mg of chloroprene-acrylonitrile copolymer rubber was measured using an element analyzer (Sumigraph 220F: manufactured by Sumika Chemical Analysis Service, Inc.), and the monomer unit of acrylonitrile was measured. The content was calculated. The content of the monomer unit of acrylonitrile was 9.9% by mass.
- the above elemental analysis was performed as follows.
- the electric furnace temperature is set to 900 ° C for the reaction furnace, 600 ° C for the reduction furnace, 70 ° C for the column, and 100 ° C for the detector, 0.2 mL / min for oxygen gas as the combustion gas, and 80 mL / min for helium gas as the carrier gas. Flowed.
- the calibration curve was prepared using aspartic acid (10.52%) having a known nitrogen content as a standard substance.
- Example 1 Manufacturing of rubber composition
- Chloroprene rubber polymer 1 The above-mentioned chloroprene-acrylonitrile copolymer rubber
- Chloroprene polymer 2 Chloroprene rubber (monoprene polymer of chloroprene), "S-40V” manufactured by Denka Co., Ltd.
- Silica CTAB adsorption specific surface area 187 m 2 / g "Nipsil AQ” manufactured by Tosoh Silica Co., Ltd.
- Carbon Black Carbon Black (FEF): Made by Asahi Carbon Co., Ltd.
- Silane coupling agent 1 3-methacryloxypropyltrimethoxysilane "KBM-503" manufactured by Shin-Etsu Chemical Co., Ltd.
- Silane coupling agent 2 Vinyl trimethoxysilane "KBM-1003" manufactured by Shin-Etsu Chemical Co., Ltd.
- Hydrotalcite 1 Chemical formula Mg 4.3 Al 2 (OH) 12.6 CO 3.3.5H 2 O "DHT-4A” manufactured by Kyowa Chemical Industry Co., Ltd.
- Hydrotalcite 2 Chemical formula Mg 3 ZnAl 2 (OH) 12 CO 3.3H 2 O "ZHT-4A” manufactured by Kyowa Chemical Industry Co., Ltd.
- Magnesium oxide "Kyowa Mag (registered trademark) 150" manufactured by Kyowa Chemical Industry Co., Ltd.
- Organic Peroxide 1 1,4-Bis [(t-Butyl Peroxy) Isopropyl] Benzene NOF CORPORATION "Perbutyl (Registered Trademark) P"
- Organic peroxide 2 2,5-dimethyl-2,5-bis (t-butylperoxy) hexin-3 NOF CORPORATION
- Product name "Perhexin (registered trademark) 25B”
- Plasticizer Polyester ester type "ADEKA Sizer (registered trademark) RS-700” manufactured by ADEKA Corporation
- Processing aid Stearic acid
- Stearic acid 50S manufactured by NEW JAPAN CHEMICAL CO., LTD.
- Heat-resistant anti-aging agent 4,4'-bis ( ⁇ , ⁇ -dimethylbenzyl) diphenylamine "Nocrack (registered trademark) CD” manufactured by Ouchi Shinko Kagaku Kogyo Co., Ltd.
- the obtained rubber composition was press-vulcanized under the conditions of 160 ° C. ⁇ 40 minutes to prepare a vulcanized molded product having a diameter of 63.6 mm, a thickness of 12.7 mm, and a center hole of 12.7 mm.
- the obtained vulcanized molded product was subjected to an aclon wear test (wear 1000 times, wear volume ⁇ V, unit: mm 3 ) in accordance with JIS K 6264-2: 2019. Those showing a value of 80 mm 3 or less were judged to be good. The results are shown in Tables 1 and 2.
- the obtained rubber composition was press-vulcanized under the conditions of 160 ° C. ⁇ 40 minutes to prepare a columnar vulcanized molded product having a diameter of 15 mm and a height of 25 mm.
- the calorific value ( ⁇ T) of the obtained vulcanized molded product was measured in accordance with JIS K 6265: 2019 under the conditions of 40 ° C., strain of 0.175 inches, load of 55 pounds, and frequency of 1,800 times per minute. .. Those showing a value of 35 ° C. or lower were regarded as acceptable. The results are shown in Tables 1 and 2.
- the rubber composition of the present invention improves the vulcanization rate, wear resistance, and low heat generation. Since the vulcanized molded product has these properties, it can be suitably used as a molded product for rubber roll applications and the like.
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Abstract
Description
好ましくは、前記構造中に二重結合を有するシランカップリング剤が、ビニルトリメトキシシラン、ビニルトリエトキシシラン、3-(メタ)アクリロキシプロピルメチルジメトキシシラン、3-(メタ)アクリロキシプロピルメチルトリメトキシシラン、3-(メタ)アクリロキシプロピルメチルジエトキシシラン、3-(メタ)アクリロキシプロピルメチルトリエトキシシランから選ばれる少なくとも1種のシランカップリング剤である。
好ましくは、前記水和物が、100℃~250℃の温度領域において、H2Oを放出する水和物である。
好ましくは、前記水和物が、下記化学式(1)で表されるハイドロタルサイト化合物、含水塩、金属水酸化物から選ばれる少なくとも1種の水和物である。
[M2+ 1-xM3+ x(OH)2]x+[An- x/n・mH2O]x-
(M2+: Mg2+、Mn2+、Fe2+、Co2+、Ni2+、Cu2+、Zn2+から選ばれる少なくとも一つの2価金属イオン M3+:Al3+、Fe3+、Cr3+、Co3+、In3+から選ばれる少なくとも一つの3価金属イオン An-:OH-、F-、Cl-、Br-、NO3 -、CO3 2-、SO4 2-、Fe(CN)6 3-、CH3COO-から選ばれる少なくとも一つのアニオン X:0<X≦0.33)
好ましくは、前記有機過酸化物がジクミルパーオキサイド、1,4-ビス[(t-ブチルパーオキシ)イソプロピル]ベンゼン、t-ブチルα-クミルペルオキシド、2,5-ジメチルー2,5-ビス(t-ブチルパーオキシ)ヘキサン、2,5-ジメチル-2,5-ビス(t-ブチルペルオキシ)ヘキシン-3から選ばれる少なくとも1種の有機過酸化物である。
好ましくは、前記シリカのセチルトリメチルアンモニウムブロマイド(CTAB)吸着比表面積が50~300m2/gである。
本実施形態に係るゴム組成物は、(1)クロロプレン系ゴム100質量部と、(2)シリカ20~80質量部と、(3)水和物を1質量部以上、20質量部未満と、(4)有機過酸化物0.3~1.4質量部とを含有し、(5)構造中に二重結合を有するシランカップリング剤をシリカ100質量部に対して0.5~15質量部含有する。
クロロプレン系ゴムは、クロロプレン重合体を主成分とするものである。クロロプレン重合体は、2-クロロ-1,3-ブタジエン(以下、クロロプレンと記す。)の単独重合体、若しくは、クロロプレンと共重合可能な他の単量体とクロロプレンとの共重合体、又はこれら重合体の混合物である。ここで、クロロプレンと共重合可能な他の単量体としては、例えば、アクリル酸メチル、アクリル酸ブチル、アクリル酸2-エチルヘキシルなどのアクリル酸のエステル類、メタクリル酸メチル、メタクリル酸ブチル、メタクリル酸2-エチルヘキシルなどのメタクリル酸のエステル類、2-ヒドロキシエチル(メタ)アクリレート、2-ヒドロキシメチル(メタ)アクリレート、2-ヒドロキシプロピル(メタ)アクリレートなどのヒドロキシ(メタ)アクリレート類、2,3-ジクロロ-1,3-ブタジエン、1-クロロ-1,3-ブタジエン、ブタジエン、イソプレン、エチレン、スチレン、アクリロニトリルなどがある。クロロプレンと共重合可能な他の単量体としては、2,3-ジクロロ-1,3-ブタジエン及びアクリロニトリルから選ばれる少なくとも1種の単量体を含むことが好ましい。
クロロプレン系ゴムは、ロジンなどを乳化分散剤として用いて、重合反応の触媒、重合開始剤、連鎖移動剤などの存在下で、クロロプレンを主成分とする原料単量体を乳化重合することにより得られる。
シリカは、充填材としてゴム組成物に添加するものであり、特に制限するものではないが、例えば、湿式シリカ(含水ケイ酸)、乾式シリカ(無水ケイ酸)、コロイダルシリカを使用することができる。本発明のゴム組成物では、特に湿式シリカの使用が好ましい。
水和物は、例えば混練作業および加硫時にH2Oが放出される構造のものが好ましい。水和物は、100℃~250℃の温度領域において、H2Oを放出する水和物であることがより好ましく、100℃~150℃の温度領域において、H2Oを放出する水和物であることがより好ましい。これにより、シランカップリング剤とシリカの反応が促進され良好な物性や加硫速度を得ることができる。
[M2+ 1-xM3+ x(OH)2]x+[An-x/n・mH2O]x- (1)
M2+:Mg2+、Zn2+などから選ばれる少なくとも一つの2価金属イオン
M3+:Al3+、Fe3+などから選ばれる少なくとも一つの3価金属イオン
An-:CO3 2-、Cl―、NO3 -などから選ばれる少なくとも一つのアニオン
X:0<X≦0.33
とすることができる。
有機過酸化物は、加硫助剤としてゴム組成物に添加するものであり、特に制限するものではないが、例えば、ジクミルパーオキサイド、ベンゾイルパーオキサイド、1,1-ビス(t-ブチルパーオキシ)-3,5,5-トリメチルシクロヘキサン、ジイソブチリルパーオキサイド、クミルパーオキシネオデカノエート、ジ-n-プロピルパーオキシジカーボネート、ジイソプロピルパーオキシジカーボネート、ジ-sec-ブチルパーオキシジカーボネート、1,1,3,3-テトラメチルブチルパーオキシネオデカノエート、ジ(4-t-ブチルシクロへキシル)パーオキシジカーボネート、ジ(2-エチルヘキシル)パーオキシジカーボネート、t-ヘキシルパーオキシネオデカノエート、t-ブチルパーオキシネオデカノエート、t-ブチルパーオキシネオヘプタノエート、t-ヘキシルパーオキシピバレート、t-ブチルパーオキシピバレート、ジ(3,5,5-トリメチルヘキサノイル)パーオキサイド、ジラウロイルパーオキサイド、1,1,3,3-テトラメチルブチルパーオキシ-2-エチルヘキサノエート、ジコハク酸パーオキサイド、2,5-ジメチル-2,5-ジ(2-エチルヘキサノイルパーオキシ)ヘキサン、t-ヘキシルパーオキシ-2-エチルヘキサノエート、ジ(4-メチルベンゾイル)パーオキサイド、t-ブチルパーオキシ-2-エチルヘキサノエート、ジ(3-メチルベンゾイル)パーオキサイド、ベンゾイル(3-メチルベンゾイル)パーオキサイド、ジベンゾイルパーオキサイド、1,1-ジ(t-ブチルパーオキシ)-2-メチルシクロヘキサン、1,1-ジ(t-ヘキシルパーオキシ)-3,3,5-トリメチルシクロヘキサン、1,1-ジ(t-ヘキシルパーオキシ)シクロヘキサン、1,1-ジ(t-ブチルパーオキシ)シクロヘキサン、2,2-ジ(4,4-ジ-(t-ブチルパーオキシ)シクロへキシル)プロパン、t-ヘキシルパーオキシイソプロピルモノカーボネート、t-ブチルパーオキシマレイン酸、t-ブチルパーオキシ-3,5,5-トリメチルヘキサノエート、t-ブチルパーオキシラウレート、t-ブチルパーオキシイソプロピルモノカーボネート、t-ブチルパーオキシ2-エチルヘキシルモノカーボネート、t-ヘキシルパーオキシベンゾエート、2,5-ジ-メチル-2,5-ジ(ベンゾイルパーオキシ)ヘキサン、t-ブチルパーオキシアセテート、2,2-ジ-(t-ブチルパーオキシ)ブタン、t-ブチルパーオキシベンゾエート、n-ブチル4,4-ジ-(t-ブチルパーオキシ)バレレート 、1,4-ビス[(t-ブチルパーオキシ)イソプロピル]ベンゼン、ジ-t-ヘキシルパーオキサイド、2,5-ジメチル-2,5-ジ(t-ブチルパーオキシ)ヘキサン、t-ブチルクミルパーオキサイド、ジ-t-ブチルパーオキサイド、p-メンタンヒドロパーオキサイド、2,5-ジメチル-2,5-ビス(t-ブチルペルオキシ)ヘキシン-3、ジイソプロピルベンゼンヒドロパーオキサイド 、1,1,3,3-テトラメチルブチルヒドロパーオキサイド、クメンヒドロパーオキサイド、t-ブチルヒドロパーオキサイドなどがある。この中でも、ジクミルパーオキサイド、1,4-ビス[(t-ブチルパーオキシ)イソプロピル]ベンゼン、t-ブチルα-クミルペルオキシド、2,5-ジメチルー2,5-ビス(t-ブチルパーオキシ)ヘキサン、2,5-ジメチル-2,5-ビス(t-ブチルペルオキシ)ヘキシン-3から選ばれる少なくとも1種であることが好ましく、特に好ましくは1,4-ビス[(t-ブチルパーオキシ)イソプロピル]ベンゼンである。
本発明の一実施形態に係るゴム組成物には、ゴム中へのシリカの分散性やゴムとシリカ間の補強効果を向上させるために、シリカ100質量部に対し0.5~15質量部の構造中に二重結合を有するシランカップリング剤を用いる。構造中に二重結合を有するシランカップリング剤の含有量は、シリカ100質量部に対して、0.5~15質量部とすることが好ましく、0.5~10質量部とすることがより好ましい。構造中に二重結合を有するシランカップリング剤の含有量は、例えば、0.5、0.6、0.7、0.8、0.9、1、2、3、4、5、6、7、8、9、10、11、12、13、14、15質量部とすることができ、ここで例示した数値の何れか2つの間の範囲内であってもよい。構造中に二重結合を有するシランカップリング剤をこの範囲で用いることにより、必要で十分な効果が得られるとともに、スコーチの発生を抑制することができる。
ゴム組成物には、本発明の効果を阻害しない範囲でカーボンブラックといった充填材や補強材、加工助剤、老化防止剤などを添加しても良い。
ゴム組成物は、上述の化合物をその加硫温度以下の温度で混練することで得られるものである。混練装置としては、ミキサー、バンバリーミキサー、ニーダーミキサー、二本ロールなどがある。
ゴム組成物の加硫成形体は、上述のゴム組成物を所望する各種の形状に成形された後に加硫したり、ゴム組成物を加硫した後に各種の形状に成形したりして得られるものである。ゴム組成物から加硫成形体を成形する方法は、プレス成形、押出成形、カレンダー成形などの方法がある。
加熱冷却ジャケットと攪拌機を備えた内容積3リットルの重合缶に、クロロプレン単量体24質量部、アクリロニトリル単量体24質量部、ジエチルキサントゲンジスルフィド0.5質量部、純水200質量部、ロジン酸カリウム(ハリマ化成株式会社製)5.00質量部、水酸化ナトリウム0.40質量部、βナフタレンスルホン酸ホルマリン縮合物のナトリウム塩(花王株式会社製)2.0質量部を添加した。重合開始剤として過硫酸カリウム0.1質量部を添加し、重合温度40℃にて窒素気流下で乳化重合を行った。クロロプレン単量体は、重合開始20秒後から分添し、重合開始からの10秒間の冷媒の熱量変化を元に分添流量を電磁弁で調整し、以降10秒毎に流量を再調節することで連続的に行った。クロロプレン単量体及びアクリロニトリル単量体の合計量に対する重合率が50%となった時点で重合停止剤であるフェノチアジン0.02質量部を加えて重合を停止させた。その後、減圧下で反応溶液中の未反応単量体を除去することでクロロプレン-アクリロニトリル共重合体ラテックスを得た。
重合率={[(総仕込み量×固形分濃度/100)-蒸発残分]/単量体の仕込み量}×100 ・・・(A)
Mw=8.42×106、1.09×106、7.06×105、4.27×105、1.90×105、9.64×104、3.79×104、1.74×104、2.63×103
(ゴム組成物の製造)
表1又は表2に記載の成分と、可塑剤10質量部と、加工助剤1質量部と、耐熱老化防止剤3質量部と、を8インチオープンロールで混練することにより実施例及び比較例のゴム組成物を得た。
クロロプレンゴム重合体1:上述のクロロプレン-アクリロニトリル共重合ゴム
クロロプレン重合体2:クロロプレンゴム(クロロプレンの単独重合体)、デンカ株式会社製「S-40V」
シリカ:CTAB吸着比表面積187m2/g 東ソー・シリカ株式会社製「Nipsil AQ」
カーボンブラック:カーボンブラック(FEF):旭カーボン株式会社製 製品名「旭#60」
シランカップリング剤1:3-メタクリロキシプロピルトリメトキシシラン 信越化学工業株式会社製「KBM-503」
ハイドロタルサイト2:化学式 Mg3ZnAl2(OH)12CO3・3H2O 協和化学工業株式会社製 「ZHT-4A」
酸化マグネシウム:協和化学工業株式会社製「キョーワマグ(登録商標)150」
有機過酸化物1:1,4-ビス[(t-ブチルパーオキシ)イソプロピル]ベンゼン 日本油脂株式会社製 「パーブチル(登録商標)P」
有機過酸化物2:2,5-ジメチル-2,5-ビス(t-ブチルペルオキシ)ヘキシン-3 日本油脂株式会社製 製品名「パーヘキシン(登録商標)25B」
可塑剤:ポリエーテルエステル系 株式会社ADEKA製「アデカサイザー(登録商標)RS-700」
加工助剤:ステアリン酸 新日本理化株式会社製「ステアリン酸50S」
耐熱老化防止剤:4,4'-ビス(α、α-ジメチルベンジル)ジフェニルアミン 大内新興化学工業株式会社製「ノクラック(登録商標)CD」
上述のゴム組成物について、日本ゴム協会標準規格SRIS3102-1977に準拠して、オシレーションディスクレオメータ(No.292ロータスレオメータ、株式会社東洋精機製作所製)を用いて160℃×60分における加硫時間(T90)を測定し、加硫速度(T90-T10)を算出した。結果を表1、表2に示す
得られたゴム組成物を、160℃×40分の条件でプレス加硫して、直径63.6mm、厚さ12.7mm、中心孔12.7mmの加硫成形体を作製した。得られた加硫成形体について、JIS K 6264-2:2019に準拠してアクロン摩耗試験(1000回摩耗、摩耗体積ΔV、単位:mm3)を行った。80mm3以下の値を示したものを良好であると判断した。結果を表1、表2に示す
得られたゴム組成物を、160℃×40分の条件でプレス加硫して、直径15mm、高さ25mmの円柱状の加硫成形体を作製した。得られた加硫成形体について、JIS K 6265:2019に準拠し、40℃、歪み0.175インチ、荷重55ポンド、振動数毎分1,800回の条件で発熱量(ΔT)を測定した。35℃以下の値を示したものを合格とした。結果を表1、表2に示す。
Claims (10)
- クロロプレン系ゴム100質量部と、
シリカ20~80質量部と、
水和物1質量部以上20質量部未満と、
有機過酸化物0.3~1.4質量部と、
前記シリカ100質量部に対して構造中に二重結合を有するシランカップリング剤0.5~15質量部と、
を含有する、ゴム組成物。 - 前記クロロプレン系ゴムが2-クロロ-1,3-ブタジエンの単独重合体、又は、2,3-ジクロロ-1,3-ブタジエン及びアクリロニトリルから選ばれる少なくとも1種の単量体と2-クロロ-1,3-ブタジエンとの共重合体を含む、請求項1記載のゴム組成物。
- 前記構造中に二重結合を有するシランカップリング剤が、ビニルトリメトキシシラン、ビニルトリエトキシシラン、3-(メタ)アクリロキシプロピルメチルジメトキシシラン、3-(メタ)アクリロキシプロピルメチルトリメトキシシラン、3-(メタ)アクリロキシプロピルメチルジエトキシシラン、3-(メタ)アクリロキシプロピルメチルトリエトキシシランから選ばれる少なくとも1種のシランカップリング剤である請求項1又は2に記載のゴム組成物。
- 前記水和物が、100℃~250℃の温度領域において、H2Oを放出する水和物である請求項1~3のいずれか一項に記載のゴム組成物。
- 前記水和物が、下記化学式(1)で表されるハイドロタルサイト化合物、含水塩、金属水酸化物から選ばれる少なくとも1種の水和物である請求項1~4のいずれか一項に記載のゴム組成物。
[化1]
[M2+ 1-xM3+ x(OH)2]x+[An- x/n・mH2O]x-
(M2+: Mg2+、Mn2+、Fe2+、Co2+、Ni2+、Cu2+、Zn2+から選ばれる少なくとも一つの2価金属イオン M3+:Al3+、Fe3+、Cr3+、Co3+、In3+から選ばれる少なくとも一つの3価金属イオン An-:OH-、F-、Cl-、Br-、NO3 -、CO3 2-、SO4 2-、Fe(CN)6 3-、CH3COO-から選ばれる少なくとも一つのアニオン X:0<X≦0.33) - 前記水和物が、Mg4.3Al2(OH)12.6CO3・3.5H2O、Mg3ZnAl2(OH)12CO3・3H2O、Mg4.5Al2(OH)13CO3・3.5H2O、Mg4.5Al2(OH)13CO3、Mg4Al2(OH)12CO3・3.5H2O、Mg6Al2(OH)16CO3・4H2O、Mg5Al2(OH)14CO3・4H2O、Mg3Al2(OH)10CO3・1.7H2Oで表されるハイドロタルサイト化合物から選ばれる少なくとも1種の水和物である請求項5に記載のゴム組成物。
- 前記有機過酸化物がジクミルパーオキサイド、1,4-ビス[(t-ブチルパーオキシ)イソプロピル]ベンゼン、t-ブチルα-クミルペルオキシド、2,5-ジメチルー2,5-ビス(t-ブチルパーオキシ)ヘキサン、2,5-ジメチル-2,5-ビス(t-ブチルペルオキシ)ヘキシン-3から選ばれる少なくとも1種の有機過酸化物である請求項1~6のいずれか一項に記載のゴム組成物。
- 前記シリカのセチルトリメチルアンモニウムブロマイド(CTAB)吸着比表面積が50~300m2/gである請求項1~7のいずれか一項に記載のゴム組成物。
- 請求項1~8のいずれか一項に記載のゴム組成物の加硫物。
- 請求項1~8のいずれか一項に記載のゴム組成物の加硫成形体。
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| CN202180079403.8A CN116529302A (zh) | 2020-11-26 | 2021-11-19 | 橡胶组合物、该橡胶组合物的硫化物、以及该橡胶组合物的硫化成型体 |
| US18/033,612 US20230365791A1 (en) | 2020-11-26 | 2021-11-19 | Rubber composition, vulcanized object obtained from said rubber composition, and vulcanized molded object obtained from said rubber composition |
| KR1020237021285A KR102835237B1 (ko) | 2020-11-26 | 2021-11-19 | 고무 조성물, 고무 조성물의 가황물 및 고무 조성물의 가황 성형체 |
| EP21897870.8A EP4253466B1 (en) | 2020-11-26 | 2021-11-19 | Rubber composition, vulcanized object obtained from said rubber composition, and vulcanized molded object obtained from said rubber composition |
| JP2022565299A JP7570431B2 (ja) | 2020-11-26 | 2021-11-19 | ゴム組成物、該ゴム組成物の加硫物、および該ゴム組成物の加硫成形体 |
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| EP4253466B1 (en) | 2024-10-02 |
| US20230365791A1 (en) | 2023-11-16 |
| JP7570431B2 (ja) | 2024-10-21 |
| EP4253466A1 (en) | 2023-10-04 |
| CN116529302A (zh) | 2023-08-01 |
| EP4253466A4 (en) | 2024-04-24 |
| JPWO2022113896A1 (ja) | 2022-06-02 |
| KR20230109180A (ko) | 2023-07-19 |
| KR102835237B1 (ko) | 2025-07-18 |
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