41 results about "Chloroprene Polymers" patented technology

The invention discloses a meteorologic balloon and a production method thereof. The raw materials consist of a solid raw material, an oily raw material and a gluey raw material; the solid raw material comprises the following components by weight: 0 to 0.30 portion of potassium hydroxide, 0 to 0.15 portion of casein, 0 to 0.10 portion of peregal O, 1.00 to 3 portions of sulfur, 1.00 to 2 portions of N-phenyl-2-naphthylamine, 1.00 to 2 portions of N-phenyl-N'-isopropyl-ursol, 1.50 to 3 portions of ethyl-phenyl-zinc dithiocarbamate, 0.20 to 5 portions of zinc oxide, and 5 to 30 portions of chloroprene polymer; the oily raw material is dioctyl sebacate, and the weight rate of the dioctyl sebacate is 5.00 to 10.0 portions; and the gluey raw material is centrifugally-concentrated natural latex, and the adding amount of the centrifugal concentrated natural latex is 100 portions. The weight of the meteorologic balloon is 1,600 to 1,700 grams, the length of the balloon body is 3.05 to 3.55 meters, the width of the ball handle is 10 to 11 centimeters, and the length of the ball handle is 12 to 16 centimeters. The meteorologic balloon can adapt to the requirement of probing high-altitude meteorological elements of more than 35,000 meters, has the advantages of good aging resistance, high blastoff height, long balloon service time and the like, and can effectively overcome the morning-evening difference.

Disclosed are a novel polychloroprene copolymer, a soapless polychloroprene latex, and a process for producing the copolymer or latex in a simple manner, which are intended to be used for the improvement in adhesion property and water resistance of a conventional polychloroprene adhesive or the improvement in oil resistance and adhesion property of a conventional styrene-butadiene block copolymer. A chloroprene block copolymer comprising a polymer (A) having the composition represented by the general formula (1) in the description and a chloroprene polymer (B), the polymer (A) being linked to one terminal or both termini of the chloroprene polymer (B), and the total amount of the 1,2-bond and the isomerized 1,2-bond in the chloroprene polymer (B) as measured by carbon-13 nuclear magnetic resonance spectrometry being 2.0 mol% or less; a soapless polychloroprene latex comprising an amphiphilic chloroprene copolymer having a hydrophobic chloroprene polymer and a hydrophilic oligomer or polymer having an acidic functional group attached to the hydrophobic chloroprene polymer and 2 wt% or less of an emulsifying agent; and a process for producing the chloroprene block copolymer or soapless polychloroprene latex.

The invention relates to a weather monitoring device, in particular to a new weather balloon, which comprises the following components by weight percent: 100 of centrifugal concentrated natural latex, 0.3 of casein, 0.3 of potassium hydroxide, 0.15 of peregal 0, 2 of sulphur, 1.5 of N-ethyl-N-phenyl dithiocarbamate zinc, 1 of N-phenyl-2-naphthylamine, 1.5 of zinc oxide, 1.5 of dibutyl sebacate, 1.5 of IR-550 polyisoprene latex, 0.05 of dispersing agent NF, 0.05 of borax, 0.3 of sodium butylnaphthalenesulfonate, 0.5 of sodium hexametaphosphate, 8 of dioctyl sebacate and 10 of chloroprene polymer. The new weather balloon provided by the invention has the advantages of high sounding altitude, long sounding time and wide application prospect.

The invention relates to a low-smoke and low-halogen shielded rubber-sheathed flexible cable for a coal mining machine. A low-smoke and low-halogen shielded rubber-sheathed flexible cable for coal mining machines, including a rubber sheath made of chloroprene polymer as the main material; zinc oxide or magnesium oxide, 2246 parts of anti-aging agent, protective agent, hard Fatty acid, paraffin wax, chlorinated paraffin wax, HZR-2 flame retardant, white carbon black, sunfast yellow, silane. The cable of the present invention is greatly reduced by burning rate (only about 20% of the original mining cable), and the amount of smoke and the amount of HCL gas released by the burning of the outer sheath rubber of itself are very low (about 10 %), which is only about 20% of the amount of smoke released by the combustion of the original flame-retardant mine cable. Release 10% of the volume of HCL gas. The concentration of smog HCL gas in the entire environmental space of the fire is even lower. From this point of view, it is a reliable guarantee to improve the safety and reliability of cables used in underground coal mines, reduce the degree of fire hazards, and prevent accidents caused by cables.

Provided is a method for producing a chloroprene graft copolymer latex containing no organic solvent and exhibiting high adhesive strength even for soft polyvinyl chloride. A method for producing a chloroprene graft copolymer latex includes a chloroprene polymerization step of giving a chloroprene polymer latex and a graft copolymerization step of giving a chloroprene graft copolymer latex. The chloroprene polymerization step is a step of subjecting at least chloroprene (A-1) of chloroprene (A-1) and a monomer (A-2) copolymerizable with chloroprene (A-1) to emulsion radical polymerization. The graft copolymerization step is a step of adding, to the chloroprene polymer latex, a (meth)acrylate (B) and an organic peroxide (C) having an octanol/water partition coefficient of −2.0 or more and 3.0 or less to subject the chloroprene polymer to graft copolymerization with the (meth)acrylate (B) at a temperature of 10° C. or more and 40° C. or less.

An object of the invention is to provide a chloroprene polymer composition resistant to discoloration under heat or light. Provided is a chloroprene rubber composition, prepared by carrying out emulsion polymerization in the presence of 0.5 to 7.0 parts by mass of a rosin acid salt as emulsifier and terminating the emulsion polymerization by addition of a polymerization inhibitor and a phosphorus- or phenol-based compound as antioxidant. It is possible according to the invention to obtain a chloroprene polymer composition superior in discoloration resistance under heat or light. The chloroprene polymer composition according to the present invention can be used favorably for adhesion of cloths, leathers, foamed sheets, papers, woods, shoe parts, and others.

A chloroprene 'activity'/controllable radical polymerization method is used for preparing polychloroprene controllable in molecular weight and narrow in molecular weight distribution. RAFT (reversible addition-fragmentation chain transfer) reagents serve as chain transfer agents to be used for chloroprene polymerization at the temperature of 30-70 DEG C, so that living polymerization of the chloroprene is realized. The molecular size of a polymerization product is adjusted by changing feed ratio of raw materials or controlling polymerization time, so that the chloroprene polymer molecular weight is accurately controlled, polymer is narrow in molecular weight distribution (PDI 1.4), and the actual molecular weight of the polymer is consistent with the theoretical polymer. A molecular chain of the chloroprene polymer generated in polymerization has an active end of an RAFT capped structure, and accordingly, the chloroprene polymer can continue to serve as macromolecular chain transfer agents and continue to transfer and initiate polymerization of a second monomer to prepare a block polymer.

Provided are a vulcanizate of a chloroprene rubber composition containing carbon black that generates a smaller amount of heat when used and a method for producing the same by a simpler and more convenient method. First, an unvulcanized rubber composition at least containing a chloroprene polymer and carbon black is vulcanization-molded, to give a semivulcanized molded article having a cure characteristic value, as determined by the method specified in JIS K6300-2: 2001, in the range of t₁₀ to t₈₀. Then, the semivulcanized molded article obtained by semivulcanized film-forming step is additionally vulcanized in the state as it is deformed entirely and the deformation is removed, to give vulcanizate in a desired shape.

The present invention relates to the use of a cyclic ketal, 2-methyl-2-ethyl-1,3-dioxolane as a solvent in adhesives, as well as an adhesive composition comprising said ketal. 2-Methyl-2-ethyl-1,3-dioxolane has high solubilization power of the polychloroprene polymer, forming solutions having high viscosity and having suitable drying time after application of a film onto a surface. Due to the good technical performance, the adhesive composition made according to the present invention is well accepted in the market, finding use to substitute compositions containing toluene or other aromatic and oxygenated solvents.

A chloroprene latex composition wherein the gel content of the chloroprene polymer is from 3 to 40 wt %, and the weight average molecular weight of the sol content is at least 400,000, and a chloroprene latex is presented which is excellent in the initial adhesive performance and normal adhesive performance and which has a good balance of heat resistance, water resistance, etc. with the adhesive properties.

An isoprene-based polymer latex composition includes a chloroprene polymer latex (A) and an isoprene polymer latex (B), in which the chloroprene polymer has a z-average particle size of 180 nm or greater and smaller than 300 nm, and a tetrahydrofuran-insoluble fraction of 80 to 99% by mass; the chloroprene polymer latex (A) is (1) a copolymer latex of chloroprene (A-1) and 2,3-dichloro-1,3-butadiene (A-2-1), or (2) a copolymer latex of the above (A-1) and (A-2-1), and another monomer (A-2-2); and the copolymer is obtained by copolymerization in which the ratio of 2,3-dichloro-1,3-butadiene (A-2-1) is 5.0 to 30.0% by mass relative to the total amount of the monomer components chloroprene (A-1) and 2,3-dichloro-1,3-butadiene (A-2-1) of 100% by mass. The isoprene-based polymer latex composition's quality is maintained, and the properties after cross-linking of a molded product obtained by dipping a dipping former into the composition multiple times do not deteriorate.

The invention relates to an anti-aging meteorological balloon and a production method thereof. Raw materials of the meteorological balloon include a solid raw material, an oily raw material and an adhesive raw material. The adhesive raw material includes 100 parts by weight of centrifugation-concentrated natural latex. The solid raw material comprises 0.05-0.6 part by weight of an aqueous solutioningredient, 4.5-15 parts by weight of an aqueous dispersion ingredient, and 5-30 parts by weight of chloroprene polymer, wherein the aqueous dispersion ingredient includes 1-2 parts of an antioxidantwingstay L and 1-2 parts of an antiozonant JMT-OZ. The meteorological balloon weighs 2900-3300 g, the length of the balloon body is 4.2-5 m, the width of the handle is 16-19 cm, and the length of thehandle is 12-16 cm. The meteorological balloon can detect meteorological factors of the upper air which is no lower than 40000 m, is excellent in aging resistance, high in lift-off height, and long in service time, and has ozone aging resistance.

A rubber latex containing a graft copolymer and a surfactant, the rubber latex being such: that the graft copolymer has a chloroprene polymer chain, and a graft chain including structural units derived from an ethylenic unsaturated carboxylic acid, the graft chain being bonded to the chloroprene polymer chain; and the molar ratio of the oxygen atom content to the chlorine atom content in the graft copolymer is 0.04-1.

Provided is a technology for producing a sulfur-modified chloroprene rubber which has excellent compression set and excellent wear resistance, while being reduced in heat generation. Provided is a sulfur-modified chloroprene rubber composition that is obtained by having a sulfur-modified chloroprene rubber, which contains at least a sulfur-modified chloroprene polymer and an emulsifying agent, contain a sulfenamide which may have an arbitrary substituent in an amount of 0.0005-0.01 part by mass per 100 parts by mass of the sulfur-modified chloroprene rubber.

A sulfur-modified chloroprene polymer latex includes an emulsifier and a sulfur-modified chloroprene polymer obtained by modifying a chloroprene polymer (A) with sulfur (B), wherein the sulfur amount Y in the sulfur-modified chloroprene polymer and the z-average particle size X of the sulfur-modified chloroprene polymer satisfy formulae (1) to (3) (formula (1): 0.10<Y<0.60; formula (2): 120<X<320; and formula (3): Y<0.0025X−0.20), the total amount of a chloroprene monomer (A-1) and a monomer (A-2) copolymerizable with the chloroprene monomer which constitute the chloroprene polymer is 100 parts by mass, the amount of sulfur (B) contained in the sulfur-modified chloroprene polymer is Y parts by mass, and the z-average particle size of the sulfur-modified chloroprene polymer is X nm. The sulfur-modified chloroprene polymer latex composition can also include a metal oxide (C), a cross-linking accelerator (D), and an antioxidant (E).

The present invention relates to a method for producing a chloroprene polymer latex, comprising: adding (B) a sodium. salt of a naphthalene sulfonate formaldehyde condensate and. (C) sodium dodecylbenzenesulfonate to a monomer solution that contains (A-1) 2-chloro-1,3-butadiene (chloroprene) or a monomer solution that contains (A-1) 2-chloro-1,3-butadiene (chloroprene) and (A-2-1) 2,3-dichloro-1,3-butadiene, and performing polymerization. Consequently, the present invention enables the production of a chloroprene polymer latex which is suppressed in aggregates that are generated during the production of a chloroprene polymer latex having a high solid content.

The invention belongs to the technical field of chloroprene rubber preparation, provides a preparation method of a chloroprene and methyl methacrylate copolymer, and aims to solve the problem that two monomers of chloroprene and methyl methacrylate (MMA) are difficult to polymerize, wherein MMA is introduced into polychloroprene in a chloroprene emulsion polymerization process, so that the purpose of modification by using a second monomer is achieved. According to the method, a chloroprene monomer and MMA are copolymerized, the MMA is introduced into polychloroprene macromolecules in a polymerization reaction stage, the chloroprene monomer is partially homopolymerized at low temperature to form a structure based on polychloroprene, then the system is heated to 70-80 DEG C, and an oil-soluble initiator is added, so that the MMA is initiated to react, and finally a product modified by the MMA is obtained. According to the invention, the obtained product takes a chloroprene polymer macromolecular structure as a main body, and an MMA polymer is introduced, so that the product has higher affinity when being in contact with cotton, leather, PVC (Polyvinyl Chloride) and the like so as to obtain better adhesive property.