77 results about "Chloroprene" patented technology

Provided are a rubber composition capable of giving vulcanized molded objects having a satisfactory balance among oil resistance, freeze resistance, and flex fatigue resistance, and a vulcanizate and a vulcanized molded object which have a satisfactory balance among oil resistance, freeze resistance, and flex fatigue resistance.According to the present invention, there is provided a rubber composition including a chloroprene-based rubber and an epichlorohydrin-based rubber, wherein the rubber composition contains 5 to 95 parts by mass of the chloroprene-based rubber and 5 to 95 parts by mass of the epichlorohydrin-based rubber, per 100 parts by mass of rubbers contained in the rubber composition, and the chloroprene-based rubber has a content of an unsaturated nitrile monomer unit of less than 25% by mass.

A process for producing E-1,1,1,4,4,4-hexafluorobut-2-ene comprises contacting 1,1,2,4,4-pentachlorobuta-1,3-diene with hydrogen fluoride in the vapor phase in the presence of a fluorination catalyst. A process for producing Z-1,1,1,4,4,4-hexafluorobut-2-ene further comprises contacting E-1,1,1,4,4,4-hexafluoro-2-butene with chlorine in the presence of a catalyst to produce 2,3-dichloro-1,1,1,4,4,4-hexafluorobutane, followed by reaction with a base to produce 1,1,1,4,4,4-hexafluoro-2-butyne, and subsequently hydrogenating hexafluoro-2-butyne to produce Z-1,1,1,4,4,4-hexafluoro-2-butene.

The present invention relates to an aqueous dispersion at least containing at least one polychloroprene, at least one component selected from the group consisting of dilute silicic acid sol, a modified silica sol and mixtures thereof, at least one acrylic acid or a copolymer containing acrylic acid ester and optionally further additives, wherein the aqueous dispersion has a pH of 9.7 to 10.8. The invention also relates to a method for preparing the aqueous dispersion, to an adhesive composition at least containing the aqueous dispersion, to the use of the dispersion for preparing adhesive compositions, to the use of the dispersion for adhesively bonding foam substrates according to the spray coagulation method, to an adhesive composite containing at least one substrate and / or sheet material adhesively bonded using the aqueous dispersion, and to a method for producing a composite material, wherein at least two joining parts of the composite material are adhesively bonded using the aqueous dispersion.

Provided is a chloroprene-based latex product capable of reducing the occurrence of aggregates during storage and / or transport, which has been difficult with conventional chloroprene-based latex products.　The present invention provides a chloroprene-based latex product comprising a container and chloroprene-based latex filled in the container, wherein at least part of the inner surface of the container is composed of a resin, and the filling amount of the chloroprene-based latex is 90-100% relative to the maximum filling capacity of the container.

The invention relates to a preparation method of 2, 3-dichloro-1, 3-butadiene with low energy consumption and high yield. According to the invention, 2, 3, 4-trichloro-1-butene is used as a raw material, a dehydrochlorination agent and a phase transfer catalyst are added in batches to promote the reaction, through two-stage addition control, the generation of by-products is reduced, the contact concentration between the product 2, 3-dichloro-1, 3-butadiene monomers is reduced, and the self-polymerization reaction of the product is inhibited, so that the amount of the product is increased, and the production cost is reduced. The preparation method has the advantages of simple process, high stability, high product quality and high product yield, ensures the product quality and yield, improves the production efficiency, and reduces the production cost at the same time.

This invention provides a chloroprene-based block copolymer latex composition with high mechanical stability and low tendency to form aggregates when shear force is applied. Furthermore, when using the chloroprene-based block copolymer latex composition of this invention to prepare compositions for specific applications, compositions with excellent mechanical stability and low tendency to form aggregates when shear force is applied can be obtained (e.g., compositions for impregnation molding, compositions for coatings). According to this invention, a chloroprene-based block copolymer latex composition is provided, comprising a chloroprene-based block copolymer containing a polymer block (A) and a chloroprene-based polymer block (B), wherein the polymer block (A) contains monomer units from a monomer (A), and the monomer (A) is a monomer that, when homopolymerized, yields a polymer with a glass transition temperature of 80°C or higher. In the aforementioned chloroprene-based block copolymer latex composition, the total content of aromatic compounds having 7 to 10 carbon atoms is 0.020 to 0.240 parts by mass relative to 100 parts by mass of the solids component in the aforementioned chloroprene-based block copolymer latex composition.

The invention provides a low-solid-content and temperature-resistant single-component chloroprene rubber adhesive and a preparation method thereof. The single-component chloroprene rubber adhesive comprises modified chloroprene rubber, tackifying resin, an acid absorbent, an auxiliary agent and a solvent, the modified chloroprene rubber is prepared through an emulsion polymerization method, 2-chloro-1, 3-butadiene is used as a main monomer, a small amount of 2-hydroxyethyl acrylate is introduced for copolymerization, and hydroxyl functional groups are introduced into rubber molecules; by controlling the molar ratio of the two monomers, the polarity and the heat resistance of the system are improved, and meanwhile, good processability is considered; the tackifying resin is terpene phenol resin prepared by reacting alpha-pinene and phenol, and the initial adhesion and compatibility of the adhesive are further improved; the obtained single-component chloroprene rubber adhesive has the advantages of being low in solid content, good in construction performance, excellent in heat resistance and storage stability and the like, and is suitable for the field of electronic, electrical and industrial bonding.

There is provided a method for producing chlorofluorobutane (CFB) by forming chlorinated butadiene by dimerizing trichloroethylene (TCE) and fluorinating hydrogen atoms of the chlorinated butadiene. Trichloroethylene (TCE) is dimerized by using a dimer represented by the following formula (1) as a solvent and in the presence of a free radical generating agent at a temperature of 100° C. or higher. Hexachlorobutadiene (C4Cl6) is produced from the above dimer by chlorination and dehydrochlorination reaction, and further, the chlorofluorobutane (CFB) is produced by fluorinating the hexachlorobutadiene.

To provide a chloroprene-based polymer latex composition capable of providing a dip-molded body excellent in flexibility and excellent in tensile strength at break. According to the present invention, there is provided a chloroprene-based polymer latex composition comprising: a chloroprene-based polymer latex (A), a metal oxide (B), a vulcanization accelerator (C), sulfur (D), and a heteroaromatic ring compound (E), wherein: a toluene-insoluble content of a chloroprene-based polymer rubber obtained by freeze-drying the chloroprene-based polymer latex (A) is 50 to 95% by mass; the chloroprene-based polymer latex composition comprises 0.3 to 15.0 parts by mass of the metal oxide (B), 0.02 to 1.50 parts by mass of the vulcanization accelerator (C), 0.01 to 0.75 parts by mass of the sulfur (D), and 0.1 to 10.0 parts by mass of the heteroaromatic ring compound (E), with respect to 100 parts by mass of a solid content of the chloroprene-based polymer latex (A); the vulcanization accelerator (C) comprises at least one selected from a group consisting of a thiuram-based vulcanization accelerator, a dithiocarbamate-based vulcanization accelerator, a thiourea-based vulcanization accelerator, a guanidine-based vulcanization accelerator, a xanthate-based vulcanization accelerator, and a thiazole-based vulcanization accelerator; and the heteroaromatic ring compound (E) is represented by general formula (1).

The invention provides application of a methyl methacrylate monomer and a butyl acrylate monomer as composite grafting monomers to improvement of grafting efficiency in preparation of emulsion type grafted chloroprene rubber from chloroprene monomers. According to the environment-friendly high-grafting-efficiency chloroprene rubber provided by the invention, through composite grafting monomer type selection, initiation-regulation system collaborative design and process optimization, double improvement of grafting efficiency and environmental friendliness is realized. MMA and BA are selected as composite grafting monomers, so that the adhesive property and the toughness are considered; a potassium persulfate and methyl ether sulfinic acid low-temperature redox initiation system is adopted, so that the reaction energy consumption is reduced, and the initiation efficiency is improved; then, a dispersant naphthalene sulfonic acid formaldehyde condensate sodium salt is introduced to accurately regulate and control the reaction process, and side reaction is inhibited; a non-sulfur regulator is further matched to improve the storage stability, solvent-free environment-friendly production is realized by taking water as a medium in the whole process, and the product can be directly used for preparing a water-based adhesive or solid rubber and is suitable for multiple fields of shoe materials, automobiles, buildings, industrial sealing and the like.

The present invention relates to a water-based adhesive (1) consisting of one or more a) polychloroprene latex, b) polymer latex, c) tackifier, d) optional auxiliary components, and water, wherein the one or more - polymer latex b) is free of chlorinated compounds and comprises at least one polymerized (meth)acrylate monomer, styrene and / or diene monomer, wherein the polymer latex b) has a glass transition temperature Tg of between -50°C and +50°C, - tackifier c) is in the form of an aqueous dispersion and based on terpene phenolic resin, rosin, rosin ester, or any combination thereof, and - optional auxiliary components d) which are selected from a specific group. Claimed also is a process to manufacture the adhesive (1), a process to bond two substrates (2) with the adhesive (1), a bonded article (3) comprising a first and second substrate (2) being bonded together with the adhesive (1).

To provide a 2,3-dichloro-1,3-butadiene solution which has storage stability and is excellent in terms of polymerizability during polymer synthesis.SOLUTION: The present invention specifically provides a 2,3-dichloro-1,3-butadiene solution which contains 2,3-dichloro-1,3-butadiene, wherein: the concentration of a polymerization inhibitor in the 2,3-dichloro-1,3-butadiene solution is more than 100 ppm and less than 3,000 ppm; the 2,3-dichloro-1,3-butadiene solution contains n types of solvents; n is an integer of 1 or more; and when δk is the solubility parameter of the solvent k, γk is the hydrogen bond parameter of the solvent k, and Ck is the mass ratio of the solvent k to the total mass of the solvents contained in the 2,3-dichloro-1,3-butadiene solution, formulae (1) and (2) are satisfied.

The invention provides full-environment-friendly low-temperature-resistant chloroprene rubber, and belongs to the technical field of rubber. The problem that existing rubber is poor in low temperature resistance and heat resistance is solved. The formula of the all-environment-friendly low-temperature-resistant chloroprene rubber consists of the following substances (by weight): 95-115 parts of CR chloroprene rubber; 3.6 to 6.4 parts of ZnO (zinc oxide); 1.2 to 2.5 parts of MgO; 1.8 to 2.4 parts of SA stearic acid; 0.6 to 1.3 parts of dispersing agent; 1.2 to 2.1 parts of a 405 anti-aging agent; 1.2 to 2.2 parts of an MB anti-aging agent; 15 to 24 parts of 68 polyol ester base oil; 45 to 62 parts of 68 silica; 6 to 12 parts of N774 carbon black; and 1.25 to 1.85 parts of a rubber accelerator. The full-environment-friendly low-temperature-resistant chloroprene rubber has the advantages of good low-temperature resistance, good heat resistance and good aging resistance.

The present invention discloses a folding capsule for an anesthesia machine and its injection molding process, relating to the technical field of folding capsules. The folding capsule for an anesthesia machine comprises the following raw materials in parts by weight: 50 parts natural rubber latex, 50 parts chloroprene latex, 1-3 parts stabilizer, 1-2 parts sodium p-styrene sulfonate aqueous solution, 3-5 parts nano-silica suspension, 2-3 parts antioxidant, 5-8 parts toughening agent, 5-10 parts sulfur, 4-8 parts zinc oxide, 5-10 parts accelerator, and 3-6 parts peregal O-20. The folding capsule prepared by the present invention has good tensile strength, aging resistance, and tear resistance.

A toothed belt is provided with: a belt main body having a plurality of teeth provided at a constant pitch on the inner circumference of the belt; a core wire embedded in the belt main body; and a tooth cloth that is provided on the inner peripheral side of the belt body and covers the plurality of tooth parts, the tooth cloth having a tooth cloth body comprising a woven fabric, a knitted fabric, or a non-woven fabric, and a crosslinked product of an uncrosslinked rubber composition impregnated on the inner peripheral side of the belt of the tooth cloth body, the non-crosslinked rubber composition contains a non-crosslinked rubber component and a low-friction-coefficient agent, the content of the low-friction-coefficient agent is 130-200 parts by mass per 100 parts by mass of the rubber component, and the rubber component is at least one selected from the group consisting of hydrogenated nitrile rubber (H-NBR), ethylene propylene diene monomer (EPDM), and chloroprene rubber (CR).

The application discloses a waxless pad for single-side polishing and planarization of a wafer and a preparation process thereof, and belongs to the technical field of the waxless pad.The waxless pad for single-side polishing and planarization of the wafer comprises a base disc and an adsorption layer, the adsorption layer is clamped on the base disc, the base disc is made of the following materials in parts by weight: modified epoxy resin 30-40 parts, carbon fiber 10-30 parts, filler 10-20 parts and curing agent 20-30 parts, and the adsorption layer is made of polyurethane foaming material.The application solves the problem that the existing polishing with large resistance is easy to wear.The waxless pad for single-side polishing and planarization of the wafer and the preparation process thereof are used for modifying the epoxy resin by using liquid chlorobutadiene-hydroxyethyl methacrylate copolymer, improving the toughness of the epoxy resin, and adding lignin sulfonate in the modified epoxy resin, so that the waxless pad has strong anti-adsorption property and reduces adsorption or adhesion of the waxless pad to polishing liquid.

The invention discloses a high-strength heat-resistant adhesive based on polybrominated dichlorobutadiene and a preparation method of the high-strength heat-resistant adhesive. A polymerization unit of the high-strength heat-resistant adhesive is composed of the following structure: [-CHBr-C (Cl) = C (Cl)-CHBr-] n, the preparation method of the polybrominated dichlorobutadiene polymer comprises the following steps: S1, enabling 2, 3-dichloro-1, 3-butadiene and bromine to react at the temperature of-20 DEG C to-10 DEG C, so as to generate a 1, 4-dibromo-2, 3-dichloro-2-butene monomer; and S2, carrying out polymerization reaction on the 1, 4-dibromo-2, 3-dichloro-2-butene monomer at the temperature of 50 to 80 DEG C in the presence of a catalyst, so as to obtain the polybrominated dichlorobutadiene polymer. The glass transition temperature (Tg) of the adhesive matrix resin, namely polybrominated dichlorobutadiene, is as high as 115 DEG C or above, and is far higher than that of a traditional chloroprene adhesive (generally Tg lt; 0 DEG C). The technical bottleneck that the strength of the traditional chloroprene rubber adhesive is sharply attenuated in an environment of over 80 DEG C is fundamentally solved.

To provide a chloroprene-based polymer capable of yielding a dip-molded article that has sufficient tensile strength at break and flexibility, and that can maintain flexibility even after long-term storage. According to the present invention, there is provided a chloroprene-based polymer comprising a chloroprene monomer unit and a 2,3-dichloro-1,3-butadiene monomer unit, wherein the chloroprene-based polymer contains 12 to 30% by mass of the 2,3-dichloro-1,3-butadiene monomer unit with respect to 100% by mass of a total of the chloroprene monomer unit and the 2,3-dichloro-1,3-butadiene monomer unit, the chloroprene-based polymer has a toluene-insoluble content of 60 to 87% by mass, a low-temperature hardness change ΔH1 of a test dip-molded article is 29 or less, wherein the test dip-molded article is obtained by molding a test chloroprene-based polymer latex composition comprising the chloroprene-based polymer by a dip coagulation method and heat-drying a molded body resulting therefrom at 130°C for 30 minutes; the low-temperature hardness change ΔH1 is represented by HB1-HA1; HA1 represents a Shore hardness measured at 23°C using the durometer type A after heat-treating the test dip-molded article at 70°C for 30 minutes and then stacking the test dip-molded article to a thickness of 6.00 ± 0.20 mm, and HB1 represents a Shore hardness measured at -10°C using the durometer type A after heat-treating the test dip-molded article at 70°C for 30 minutes, further storing the test dip-molded article at -10°C for 168 hours, and then stacking the test dip-molded article to a thickness of 6.00 ± 0.20 mm, and a ratio RB / RA is 0.10 or more and 0.70 or less, wherein the ratio RB / RA is a ratio of a total peak area RB of abietic acid, neoabietic acid, palustric acid, levopimaric acid, and salts thereof to a total peak area RA of dehydroabietic acid, pimaric acid, isopimaric acid, dihydroabietic acid, and salts thereof, obtained from a gas chromatography analysis of an extract extracted from the test dip-molded article with an ethanol and toluene azeotropic mixture specified in JIS K 6229.

An elastomeric article (20) and a process for forming an elastomeric article are provided. The elastomeric article includes a body (26) having a first side and a second side opposite the first side. The body is formed from an elastomeric material including polyurethane, nitrile rubber, styrene-butadiene rubber, isobutylene-isoprene rubber, polychloroprene, polyisoprene, natural rubber, or a combination thereof. The first side includes a uniform surface (22). The second side includes a surface (24) having an embossed shape (32) extending therefrom in a direction opposite the first side of the body.

Provided are a rubber asphalt emulsion that can exhibit higher aggregate grip when combined with aggregate, and a chloroprene latex that can provide such a rubber asphalt emulsion. The chloroprene latex includes a polymer that contains a structural unit derived from a chloroprene monomer and a structural unit derived from a second monomer other than the chloroprene monomer, the second monomer being a monomer that has a crystallization temperature, a glass transition temperature, or a melting point of 80°C or higher when homopolymerized, the content of the structural unit derived from the second monomer in the polymer being 3 to 10 parts by mass for every 100 parts by mass of the total amount of structural units that make up the polymer, and the z-average particle diameter of the polymer being 150 nm or less.

An asphalt composition contains asphalt and a chloroprene-based polymer, wherein a content of the chloroprene-based polymer is 5 parts by mass or more and 20 parts by mass or less based on 100 parts by mass of asphalt solid content, and a tetrahydrofuran insoluble content of the chloroprene-based polymer is 20% by mass or more and 90% by mass or less. A method for producing an asphalt composition includes mixing an asphalt emulsion and a chloroprene latex so that the chloroprene latex is 5 parts by mass to 20 parts by mass based on 100 parts by mass of asphalt solid content in the asphalt emulsion in terms of solid content, wherein a tetrahydrofuran insoluble content of the chloroprene-based polymer is 20% by mass or more and 90% by mass or less.

The application discloses a method for determining the content of polychlorobenzene and polychlorobutadiene in ambient air, which comprises the following steps: (1) using a composite adsorption tube to adsorb and collect target substances in air, and then pressurizing and sealing the composite adsorption tube after the collection is completed; (2) placing the composite adsorption tube with the adsorbed target substances in a thermal desorption instrument to perform primary thermal desorption, and then introducing the target substances into a gas chromatography mass spectrometry analysis system after secondary focusing by a cold trap for analysis; the target substances are polychlorobenzene and polychlorobutadiene. The method can realize synchronous and accurate qualitative and quantitative analysis of wide-boiling-point chlorine-containing organic substances in a complex environmental matrix.

A process for producing E-1,1,1,4,4,4-hexafluorobut-2-ene comprises contacting 1,1,2,4,4-pentachlorobuta-1,3-diene with hydrogen fluoride in the vapor phase in the presence of a fluorination catalyst. A process for producing Z-1,1,1,4,4,4-hexafluorobut-2-ene further comprises contacting E-1,1,1,4,4,4-hexafluoro-2-butene with chlorine in the presence of a catalyst to produce 2,3-dichloro-1,1,1,4,4,4-hexafluorobutane, followed by reaction with base to produce 1,1,1,4,4,4-hexafluoro-2-butyne, and subsequently hydrogenating hexafluoro-2-butyne to produce Z-1,1,1,4,4,4-hexafluoro-2-butene.

This invention relates to a method for synthesizing squaric acid, the method comprising the following steps: (1) reacting alkyl vinyl ether, trichloroacetyl chloride, and zinc to obtain 2,2-dichloro-3-alkoxycyclobutanone; (2) subjecting 2,2-dichloro-3-alkoxycyclobutanone to chlorination with chlorine to obtain 2,2,4,4-tetrachloro-3-alkoxycyclobutanone; (3) subjecting 2,2,4,4-tetrachloro-3-alkoxycyclobutanone to elimination reaction with a base to obtain 2,4,4-trichloro-3-alkoxycyclobuten-1-one; and (4) subjecting 2,4,4-trichloro-3-alkoxycyclobuten-1-one to hydrolysis to obtain the squaric acid. The synthesis method provided by this invention avoids the use of the prohibited raw material perchloro-1,3-butadiene and has lower energy consumption, meeting the needs of green and clean production.

The present invention relates to a water-based adhesive (1) for bonding foamed organic substrates with a reduced content of polychloroprene latex, consisting of one or more a) polychloroprene latex, b) polymer latex binder, 5 c) tackifier, d) optional auxiliary components, and water, wherein the one or more - polymer latex binder b) is free of chlorinated compounds and comprises at least one polymerized (meth)acrylate monomer, styrene and / or diene monomer, wherein the polymer latex binder b) 10 has a glass transition temperature Tg of between -50°C and +50°C, - tackifier c) is in the form of an aqueous dispersion and based on terpene phenolic resin, rosin, rosin ester, or any combination thereof, and - optional auxiliary components d) which are selected from a specific 15 group. Claimed also is a process to manufacture the adhesive (1), a process to bond two substrates (2) with the adhesive (1), a bonded article (3) comprising a first and second substrate (2) being bonded together with the adhesive (1).