136 results about "Chloroprene" patented technology

The invention provides a method for preparing squaric acid and a method for preparing a lithium supplement agent of lithium squarate. The method for preparing squaric acid comprises the steps of preparing an intermediate I, preparing an intermediate II and preparing squaric acid. The method for preparing the squaric acid is a novel squaric acid synthesis route, and the squaric acid is obtained through cycloaddition / substitution reaction of perchloroprene serving as an initial raw material and morpholine, hydrolysis / rearrangement reaction in a buffer system and acid hydrolysis reaction in sequence. The method for preparing squaric acid has the advantages of simple reaction steps, mild reaction conditions, high yield, low cost and the like. The invention also provides a method for preparing the lithium squarate lithium supplement agent, and the prepared squaric acid and lithium-containing alkali are blended in a solvent for reaction to generate the lithium squarate. The method for preparing the lithium squarate lithium supplement has the advantages of simple reaction steps, mild reaction conditions, high yield, low cost and the like.

An elastomeric article is formed from a blend of nitrile rubber and polychloroprene rubber. The elastomeric article can be a glove, such as a medical exam glove. The elastomeric article is softer than a conventional nitrile elastomeric article. The elastomeric article is formed from a blended rubber latex emulsion of nitrile and polychloroprene. The blended rubber latex emulsion may be free of sulfur and vulcanization accelerators.

An asphalt emulsion composition containing sulfur-copolymerized chloroprene, asphalt and water, a method for producing the same, and a latex composition for modifying asphalt, containing sulfur-copolymerized chloroprene and water.

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.

Provided is a rubber composition with which it is possible to obtain a vulcanized product and a vulcanized molded product having excellent wear resistance. According to the present invention, there is provided a rubber composition containing a chloroprene rubber, silica, a silane coupling agent, and a hydrate, the rubber composition containing 5-80 parts by mass of silica and 0.5-20 parts by mass or more of hydrate per 100 parts by mass of the chloroprene rubber, and the rubber composition containing 5-80 parts by mass of silica and 0.5-20 parts by mass of hydrate per 100 parts by mass of the chloroprene rubber. The content of a silane coupling agent is 0.5-15 parts by mass per 100 parts by mass of the silica, and the rubber composition satisfies at least one of the following conditions i) and ii): condition i) the rubber composition contains 3-methyl-thiazolidine-2-thione, and in the rubber composition, the content of 3-methyl-thiazolidine-2-thione is 0.5-15 parts by mass per 100 parts by mass of the chloroprene-based rubber, and the content of 3-methyl-thiazolidine-2-thione is 0.5-15 parts by mass per 100 parts by mass of the chloroprene-based rubber. The composition contains 0.1 to 3.0 parts by mass of 3-methyl-thiazolidine-2-thioketone; condition ii) the rubber composition contains a compound A and a compound B. The compound A is at least one compound selected from the group consisting of thiourea compounds, 3-methyl-thiazolidine-2-thione, and bis (5-mercapto-1, 3, 4-thiadiazol-2-yl) disulfides, and the compound B is at least one compound selected from the group consisting of thiourea compounds, 3-methyl-thiazolidine-2-thione, and bis (5-mercapto-1, 3, 4-thiadiazol-2-yl) disulfides. The compound B is at least one compound selected from the group consisting of thiuram-based compounds, sulfinamide-based compounds, thiazole-based compounds, guanidine-based compounds, benzimidazole-based compounds, N-phenyl-N-(trichloromethylthio) benzsulfonamide, and diazabicyclo-undecene-based compounds, and the content of the compound B is 100 parts by mass per 100 parts by mass of the chloroprene rubber. The rubber composition contains 0.1 to 3.0 parts by mass of a compound A and 0.01 to 3.0 parts by mass of a compound B.

The utility model discloses detection equipment for producing a chloroprene-phenolic adhesive, which relates to the technical field of adhesive detection and comprises a detection box and a plurality of heat conduction pipes, an electric heating wire is fixedly arranged on the inner wall of each heat conduction pipe, and a plurality of detection rods are fixedly arranged at the bottom of a push plate. Through the arrangement of the plurality of electric heating wires and the plurality of detection rods, the chloroprene-phenolic adhesive is added into the containing box, the plurality of electric heating wires can transfer heat to the interior of the containing box so as to heat the chloroprene-phenolic adhesive, the air cylinder is started to push the push plate and the plurality of detection rods to move downwards, and then the chloroprene-phenolic adhesive can be heated. The plurality of detection rods can be inserted into the chloroprene-phenolic adhesive, a user observes the adhesion state of the chloroprene-phenolic adhesive on the plurality of rod walls until the chloroprene-phenolic adhesive is not adhered to the detection rods along with the temperature rise, and the heat resistance of the chloroprene-phenolic adhesive can be detected.

The invention belongs to the technical field of chloroprene rubber preparation, and provides a method for preparing cold-resistant chloroprene rubber by changing the regularity of a chloroprene rubber molecular chain structure through monomer copolymerization. The preparation method comprises the following steps: adding a redox initiator at the emulsion polymerization temperature of 40 + / -0.2 DEG C to initiate a free radical emulsion copolymerization reaction, controlling the conversion rate of chloroprene monomers, adding a terminating agent to terminate the reaction when the polymerization degree is reached, removing unparticipated reaction monomers in the emulsion, acidizing and demulsifying latex, freezing and drum forming a film, and drying to obtain the high-cold-resistance chloroprene rubber emulsion. The technical innovation point of the chloroprene rubber is that the cold resistance of the chloroprene rubber is improved through copolymerization of chloroprene and unsaturated double-bond esters, and the defect that the performance of the chloroprene rubber is influenced by the difference of the use conditions of the chloroprene rubber is overcome. The poor cold resistance of common chloroprene rubber is improved, and the combination of excellent mechanical property and vulcanization property of the chloroprene rubber is maintained.

The invention discloses a synthesis method of a pimozide intermediate, and relates to the field of organic synthesis methods and electrochemical catalysis. The technical problem that in the prior art, non-activated olefin and aryl halide are efficiently coupled to generate 4, 4-bis (4-fluorobenzene) chlorobutane is solved. The method comprises the following steps: reducing a nickel catalyst through a constant current in an inert gas atmosphere by utilizing an electrochemical catalysis means, carrying out an oxidative addition reaction on the reduced nickel catalyst and aryl halide, then adding the reduced nickel catalyst to non-activated olefin, and carrying out a nickel migration reaction to form the aryl-shifted nickel compound intermediate. According to the method, the synthesis steps are greatly reduced, the reaction efficiency and selectivity are improved, especially when the pimozide intermediate is synthesized, the production cost can be remarkably reduced, the reaction time can be remarkably shortened, and higher industrial application potential is shown. The pimozide intermediate prepared by the invention is used in the field of chronic mental disorder treatment.

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 discloses waterborne polyurethane roller glue as well as a preparation method and application thereof. The waterborne polyurethane roller glue comprises the following components in parts by weight: 100 parts of a waterborne polyurethane dispersion, 15-35 parts of a plasticizer and 5-20 parts of a stabilizer aqueous solution, the waterborne polyurethane dispersion is prepared from the following raw materials in percentage by weight: 5 to 20 percent of aliphatic diisocyanate, 70 to 90 percent of polyol, 1 to 5 percent of a hydrophilic compound, 1 to 3 percent of a chain extender and 0.007 to 0.035 percent of an emulsifier, wherein the total weight of solid components is 100 percent. The waterborne polyurethane roller glue has the characteristics of good initial adhesion, good heat storage stability and vibration stability, no halogen, yellowing resistance, low odor, recyclability and the like, is mainly suitable for adhesion of porous base materials such as sponge mattresses and the like, and can replace the existing waterborne chloroprene rubber roller glue.

There is provided an adhesive agent exhibiting high adhesive strength to polyolefin. An adhesive agent contains a chloroprene copolymer latex containing a chloroprene copolymer (A) and a metal oxide (B). The chloroprene copolymer (A) is a copolymer of a monomer group containing chloroprene (A-1), α,β-unsaturated carboxylic acid (A-2), and 2,3-dichloro-1,3-butadiene (A-3). The chloroprene copolymer (A) has a tetrahydrofuran-soluble component soluble in tetrahydrofuran and the weight average molecular weight of the tetrahydrofuran-soluble component is 80000 or more and 140000 or less. When the amount of the metal oxide (B) based on 100 parts by mass of the chloroprene copolymer (A) is defined as Y part(s) by mass and the weight average molecular weight of the tetrahydrofuran-soluble component is defined as X, the content of the metal oxide (B) satisfies Formula: −1.2×X / 100000+1.6<Y<−4.2×X / 100000+5.7.

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 present invention provides a chloroprene-based block copolymer, a latex, a latex composition, and a rubber composition that can obtain a product having excellent tensile properties and good flexibility even without using a vulcanizing agent and a vulcanization accelerator. A chloroprene-based block copolymer contains 5 to 30% by mass of a polymer block (A) derived from a monomer that gives a polymer having a glass transition temperature of 80°C or higher upon homopolymerization; and 70 to 95% by mass of a chloroprene-based polymer block (B) having a chloroprene monomer unit and a polyfunctional monomer unit.

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).

The invention relates to the technical field of rubber composite materials, and particularly discloses an antioxidant impact-resistant rubber strip for a billiard table and a preparation method of the antioxidant impact-resistant rubber strip. The preparation method comprises the following steps: S1, adding the chloroprene rubber composition and the stearic acid into an internal mixer, and mixing for 30-60 seconds; adding white carbon black, mixing for 3-5 minutes, adding a vulcanizing agent and an accelerant, mixing, carrying out thin-passing, and carrying out vulcanization molding to obtain a rubber layer; and S2, the pretreated fiber cloth is attached to the surface of the rubber layer, thermal compounding is conducted, and the rubber strip is obtained. The rubber layer comprises the following raw materials in parts by mass: 100 parts of a chloroprene rubber composition, 1-2 parts of stearic acid, 40-50 parts of white carbon black, 3-5 parts of a vulcanizing agent and 1-2 parts of an accelerant. The chloroprene rubber composition comprises high Mooney chloroprene rubber, modified chloroprene rubber and low Mooney chloroprene rubber. The Mooney viscosity of the high Mooney chloroprene rubber is 110-130, and the Mooney viscosity of the low Mooney chloroprene rubber is 30-50.

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.