摘要:
A fluororubber composition includes a polyol-crosslinkable fluororubber, a crosslinking accelerator, a polyol crosslinking agent and calcium hydroxide, with the crosslinking accelerator having a specific weight ratio relative to the polyol crosslinking agent, and is heat treated under specific conditions to give a low-friction fluororubber crosslinked product that is well balanced and excellent in properties such as low frictional properties, low tackiness and low resilience properties and that is favorably employed as rubber vibration insulators and impact-absorbing stoppers represented by HDD stoppers.
摘要:
A polyol-crosslinkable fluororubber composition comprises 100 parts by weight of polyol-crosslinkable fluororubber; 0.5 to 10 parts by weight of a perfluoroalkane represented by the general formula F(CF2)2nF (n: 5˜30), a 1H-perfluoroalkane represented by the general formula F(CF2)mH (m: 10˜30), or a mixture thereof; 0.5 to 2 parts by weight of basic magnesium aluminum hydroxycarbonate hydrate; and 1 to 5 parts by weight of an acid acceptor compound excluding Ca compounds. The fluororubber composition can simultaneously attain improvement in preservation stability of compounds, prevention of compounds from adhesion at the time of kneading, short-time vulcanization, improvement of mold releasability at the time of vulcanization molding, prevention of contamination with metal ions and reduction in adhesiveness of crosslinking products due to increase of crosslinking density without substantially impairing the normal state physical properties or compression set characteristics and further advantage-ous properties inherent in the fluororubber, and contains no calcium compounds causing contamination of HDD.
摘要:
A fluororubber composition includes a polyol-crosslinkable fluororubber, a crosslinking accelerator, a polyol crosslinking agent and calcium hydroxide, with the crosslinking accelerator having a specific weight ratio relative to the polyol crosslinking agent, and is heat treated under specific conditions to give a low-friction fluororubber crosslinked product that is well balanced and excellent in properties such as low frictional properties, low tackiness and low resilience properties and that is favorably employed as rubber vibration insulators and impact-absorbing stoppers represented by HDD stoppers.
摘要:
A polyol-crosslinkable fluororubber composition comprises 100 parts by weight of polyol-crosslinkable fluororubber; 0.5 to 10 parts by weight of a perfluoroalkane represented by the general formula F(CF2)2nF (n: 5˜30), a 1H-perfluoroalkane represented by the general formula F(CF2)mH (m: 10˜30), or a mixture thereof; 0.5 to 2 parts by weight of basic magnesium aluminum hydroxycarbonate hydrate; and 1 to 5 parts by weight of an acid acceptor compound excluding Ca compounds. The fluororubber composition can simultaneously attain improvement in preservation stability of compounds, prevention of compounds from adhesion at time of kneading, short-time vulcanization, improvement of mold releasability at the time of vulcanization molding, prevention of contamination with metal ions and reduction in adhesiveness of crosslinking products due to increase of crosslinking density without substantially impairing the normal state physical properties or compression set characteristics and further advantage-ous properties inherent in the fluororubber, and contains no calcium compounds causing contamination of HDD.
摘要:
Disclosed is an acrylic rubber composition comprising, based on 100 parts by weight of carboxyl group-containing acrylic rubber, 0.05 to 5 parts by weight of a diurethane compound represented by the general formula: R2(SO2)m(CH2)nOCONHR1NHCOO(CH2)n(SO2)mR2 (R1: a divalent organic group; R2: when it is in a carbamate structure form, a group that decomposes by the action of a basic vulcanization accelerator; n: 0, 1, or 2; and m: 0 or 1), 0.3 to 3 parts by weight of a diaminodiphenyl ether-based compound, and 0.08 to 1.2 parts by weight of an N-containing heterocyclic compound; the composition being free from 1,3-o-tolylguanidine. This acrylic rubber composition allows high-speed vulcanization, without using 1,3-di-o-tolylguanidine generating o-toluidine, and has excellent scorch stability. Furthermore, the vulcanization-molded product of the acrylic rubber composition can sufficiently satisfy compression set characteristics required for sealing parts.
摘要翻译:公开了一种丙烯酸类橡胶组合物,其包含基于100重量份的含羧基的丙烯酸橡胶,0.05至5重量份由通式R2(SO2)m(CH2)nOCONHR1NHCOO(CH2)表示的二氨基甲酸酯化合物, n(SO 2)m R 2(R 1:二价有机基团; R 2:当其为氨基甲酸酯结构形式时,通过碱性硫化促进剂的作用分解的基团; n:0,1或2; m:0 或1),0.3〜3重量份的二氨基二苯醚系化合物和0.08〜1.2重量份的含N杂环化合物; 该组合物不含1,3-邻甲苯胍。 该丙烯酸橡胶组合物不使用产生邻甲苯胺的1,3-二邻甲苯胍,能够进行高速硫化,具有优异的焦烧稳定性。 此外,丙烯酸橡胶组合物的硫化成型品可以充分满足密封部所需的压缩变形特性。
摘要:
Providing an NBR composition substantially free of containment of an insolubilized substance-generating causative substance so as to prevent generation of an insolubilized substance due to extraction by a fuel while which composition is excellent in ozone resistance, ejectability from kneader, and which composition realizes a first compression set and a second compression set which are both 46% or less. An NBR composition including a polymer obtained by mixing an acrylonitrile-butadiene rubber (NBR) with polyvinyl chloride (PVC), wherein the NBR composition is obtained without blending an insolubilized substance-generating causative substance, or, in case of blending, by blending an insolubilized substance-generating causative substance at an upper limit of 0.15 parts by weight or less, into 100 parts by weight of the polymer having a PVC content of 15.70 to 17.50 wt %.
摘要:
Providing an NBR composition substantially free of containment of an insolubilized substance-generating causative substance so as to prevent generation of an insolubilized substance due to extraction by a fuel while which composition is excellent in ozone resistance, ejectability from kneader, and which composition realizes a first compression set and a second compression set which are both 46% or less. An NBR composition including a polymer obtained by mixing an acrylonitrile-butadiene rubber (NBR) with polyvinyl chloride (PVC), wherein the NBR composition is obtained without blending an insolubilized substance-generating causative substance, or, in case of blending, by blending an insolubilized substance-generating causative substance at an upper limit of 0.15 parts by weight or less, into 100 parts by weight of the polymer having a PVC content of 15.70 to 17.50 wt %.
摘要:
[Object] To provide a fluororubber-based sealing material which is excellent in sealing properties under high/low temperature load and is capable of sealing at a temperature of not higher than −40° C. even when gas oil (diesel fuel) is used.[Means for Solving] A fluororubber-based sealing material obtained by crosslinking a composition for a fluororubber-based sealing material, said composition comprising 100 parts by weight of a fluorine-containing copolymer which contains 64 to 69% by weight of fluorine, has a crosslinking site derived from a bromine-containing compound and/or an iodine-containing compound and is capable of being crosslinked by a peroxide, 0.5 to 6 parts by weight of an organic peroxide and 1 to 10 parts by weight of a polyfunctional monomer, wherein the fluorine-containing copolymer in the composition for a fluororubber-based sealing material is a fluororubber polymer obtained by copolymerizing (a) VDF, (b) TFE, (c) FMVE, (d) FMMVE and (e) brominated/iodinated unsaturated fluorohydrocarbon.
摘要:
An equivalent circuit for a coil incorporated in a circuit simulator is a model of an equivalent circuit for a coil included in a circuit simulator for analysis of an electrical device including a coil forming a magnetic circuit. The equivalent circuit of a coil included in an electric motor or other electrical device is preferably comprised of a resistance component (R), induced voltage component (−dΦ/dt), and inductance component (L). The equivalent circuit of the inductance component is provided with a current source, a voltage extractor for extracting the voltage across the terminals of this current source, a current generator for determining the value of the current of the current source based on the value of the voltage output by this voltage extractor, and a current-carrying path connected in parallel to the current source and carrying a regenerative current at the time of off operation. By the above configuration, an electrical device including a coil can be analyzed and the iterative calculation at the time of handling nonlinear characteristic data becomes unnecessary. An actual model can be realized with variable values of the inductance element.
摘要:
Solid foodstuffs, such as cheese-like foodstuffs, are prepared from soybean protein, casein, oils and/or fats and water by first intimately mixing the soybean protein with water to entirely wet or hydrate the soybean protein prior to or separately from melting the casein by heating the system to an elevated temperature with agitation. In spite of the agitation with heating, the solid foodstuffs produced by the method have a smooth body which is free from a sandy feeling, dryness and crumbling and also has an excellent melting feeling to the tongue and mouth.