54 results about "Chloroprene" patented technology

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.

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 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.

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 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.

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 invention discloses a method for detecting hexachlorobutadiene in a water body, and belongs to the technical field of electrochemical sensing detection. According to the method, thiophene is used as a functional monomer, hexachlorobutadiene is used as a template molecule, a molecularly imprinted membrane solution containing hexachlorobutadiene is polymerized to the surface of a working electrode through an electrochemical polymerization method, and hexachlorobutadiene in a water body is determined through a differential pulse voltammetry method. The method has the advantages of high sensitivity, low detection limit, short detection time and the like.

[Problem] To provide: a method for producing waste-derived chloroprene that can be used as a raw material for synthetic rubber, while reducing the environmental burden thereof; and a method for producing chloroprene rubber. [Solution] One aspect of the present invention provides a method for producing chloroprene, said method comprising: a preparation step for preparing a fixed carbon source that contains a waste combustion residue; a generation step for generating a chloroprene precursor from the fixed carbon source; and a conversion step for converting the chloroprene precursor into chloroprene.

The invention discloses a water-based self-healing type non-curing rubber asphalt waterproof coating and a preparation method thereof, and belongs to the technical field of building waterproof materials. The invention discloses a non-cured waterproof coating which comprises the following components in parts by weight: 3300-3500 parts of anionic emulsified asphalt, 450-550 parts of anionic neoprene latex (511A type), 950-1050 parts of acrylate emulsion (515 type), 110-130 parts of a self-healing functional aid group, 4-8 parts of caustic soda No.3 and 3-7 parts of a wetting agent. The non-cured waterproof coating has the advantages of low VOC emission, good low-temperature toughness and strong compatibility with coiled materials, and solves the problems that the existing non-cured waterproof coating has excessive VOC and is not easy to crack, and the service life of the non-cured waterproof coating is prolonged. The problems that indoor air quality and human health are affected, low-temperature toughness is poor, application in cold regions is limited, compatibility with coiled materials is insufficient, and water is prone to permeating and flowing on an interface to form water channeling are solved.

The invention relates to the technical field of adhesives, in particular to a flame-retardant adhesive and a preparation method thereof. The flame-retardant adhesive is prepared from the following components in parts by weight: 60 to 80 parts of silicon-phosphorus co-modified epoxy resin, 1.5 to 3.5 parts of polychloroprene, 1.6 to 3.2 parts of C9 petroleum resin, 1.2 to 3.2 parts of phenolic resin, 1.3 to 3.1 parts of hydrogenated rosin, 11.0 to 13.0 parts of an emulsifier, 0.05 to 0.15 part of magnesium oxide, 15 to 22 parts of composite flame-retardant filler, 76.3 to 83.6 parts of a diluent, 3 to 8 parts of a toughening agent, 10 to 15 parts of a curing agent and 0.5 to 2 parts of an accelerant, the composite flame-retardant filler is a micro-nano composite particle with a core-shell structure, the core is modified ammonium polyphosphate, the shell layer is porous nano silicon dioxide wrapping the core-shell structure, and a carbon nanotube and a layered double hydroxide nanosheet are loaded in the shell layer. According to the flame-retardant adhesive provided by the invention, the flame retardance of the adhesive is improved, and the resin is endowed with good flame retardance through silicon-phosphorus synergistic modification.

Provided are a chloroprene-based polymer latex composition capable of yielding an adhesive composition having excellent initial adhesive strength and freeze stability, and an adhesive composition comprising the same. According to the present invention, there is provided a chloroprene-based polymer latex composition comprising a chloroprene-based polymer and a nonionic emulsifier, wherein the chloroprene-based polymer latex composition comprises 0.005 to 0.40 parts by mass of the nonionic emulsifier with respect to 100 parts by mass of the chloroprene-based polymer, and the chloroprene-based polymer has an average particle size of 80 to 160 nm and a toluene insoluble content of 30% by mass or less.

The invention relates to a method for synthesizing squaric acid, which comprises the following steps of: (1) reacting alkyl vinyl ether, trichloroacetyl chloride and zinc to obtain 2, 2-dichloro-3-alkoxy cyclobutanone; (2) carrying out a chlorination reaction on the 2, 2-dichloro-3-alkoxy cyclobutanone and chlorine gas to obtain 2, 2, 4, 4-tetrachloro-3-alkoxy cyclobutanone, and carrying out a chlorination reaction on the 2, 2-dichloro-3-alkoxy cyclobutanone and chlorine gas to obtain 2, 2, 4, 4-tetrachloro-3-alkoxy cyclobutanone; (3) the 2, 2, 4, 4-tetrachloro-3-alkoxy cyclobutanone and alkali are subjected to an elimination reaction, and 2, 4, 4-trichloro-3-alkoxy cyclobutene-1-one is obtained; and (4) carrying out a hydrolysis reaction on the 2, 4, 4-trichloro-3-alkoxy cyclobutene-1-ketone, so as to obtain the squaric acid. The synthesis method provided by the invention can avoid the use of a forbidden raw material perchloro-1, 3 butadiene, also has lower energy consumption, and can meet the requirements of green and clean production.

The present invention provides a chloroprene-based block copolymer, a chloroprene-based block copolymer latex, a chloroprene-based block copolymer latex composition, a rubber composition, and a chloroprene-based block copolymer that can be obtained to produce a dipping molded article with high flexibility and low tensile permanent strain. [Solution] According to the present invention, a chloroprene-based block copolymer is provided, comprising a polymer block (A) and a chloroprene-based polymer block (B), wherein the polymer block (A) comprises monomer units derived from monomer (A), and monomer (A) is a monomer from which a polymer with a glass transition temperature of 80°C or higher can be obtained during homopolymerization; the chloroprene-based polymer block (B) comprises chloroprene monomer units, polyfunctional monomer units, and unsaturated nitrile monomer units; and the chloroprene-based block copolymer has a nitrogen content of 0.10 to 0.90% by mass as measured by combustion.

A rubber composition includes a chloroprene-based rubber, 5 to 80 parts by mass of silica, 0.5 to 15 parts by mass a silane coupling agent, and 0.5 to less than 20 parts by mass of a hydrate. The rubber composition satisfies at least one of (i) and (ii): (i) the rubber composition includes 0.1 to 3.0 parts by mass of 3-methyl-thiazolidine-2-thione; (ii) the rubber composition includes 0.1 to 3.0 parts by mass of compound A that is at least one of a thiourea-based compound, 3-methyl-thiazolidine-2-thione, and di(5-mercapto-1,3,4-thiadiazol-2-yl) disulfide; and 0.01 to 3.0 parts by mass of compound B that is at least one of a thiuram-based compound, a sulfenamide-based compound, a thiazole-based compound, a guanidine-based compound, a benzimidazole-based compound, N-phenyl-N-(trichloromethylthio)benzenesulfonamide, and a diazabicycloundecene-based compound.