Chloroprene, method for producing chloroprene, chloroprene-based polymer, vulcanized molded article, adhesive composition, composition for forming dip molded article, and dip molded article

Abstract

To provide chloroprene utilizable as a raw material for synthetic rubbers while reducing loads on the environment, to provide a method for producing the chloroprene, and to provide a chloroprene rubber.SOLUTION: According to one aspect of the present invention, there is provided chloroprene, wherein the chloroprene contains a carbon atom derived from biomass.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to chloroprene, a method for producing chloroprene, a chloroprene-based polymer, a vulcanized molded product, an adhesive composition, a composition for forming a dip-molded product, and a dip-molded product. [Background technology]

[0002] In recent years, there has been an increasing demand for bioplastics in order to reduce the burden on the environment. As a bioplastic, biopolyethylene has been put on the market and is expected to contribute to reducing carbon dioxide emissions (see Patent Document 1). Currently, the types of bioplastics that can be produced are limited, and there is a demand for the development of compounds that can be used as raw materials for a wider range of bioplastics.However, there are not many known bio-derived compounds that can be used as raw materials for synthetic rubber. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-511634 A Summary of the Invention [Problem to be solved by the invention]

[0004] In view of the above circumstances, the present invention provides chloroprene that can be used as a raw material for synthetic rubber while reducing the burden on the environment, a method for producing chloroprene, and chloroprene rubber. [Means for solving the problem]

[0005] According to one aspect of the present invention, there is provided chloroprene, the chloroprene containing carbon atoms derived from biomass.

[0006] According to this embodiment, it is possible to supply chloroprene that can be used as a raw material for synthetic rubber while reducing the burden on the environment. DETAILED DESCRIPTION OF THE INVENTION

[0007] Hereinafter, embodiments of chloroprene, a method for producing chloroprene, and chloroprene rubber will be described. Various features shown in the following embodiments can be combined with each other.

[0008] <Chloroprene and chloroprene rubber> The chloroprene (2-chloro-1,3-butadiene) of this embodiment contains carbon atoms derived from biomass. The use of such chloroprene makes it possible to produce synthetic rubber (chloroprene rubber) while reducing the burden on the environment. This can contribute to the realization of a carbon-recycling society. The chloroprene polymer of the present embodiment is a polymer of the above-mentioned chloroprene. Use of such a chloroprene rubber can reduce the burden on the environment and contribute to the realization of a carbon-recycling society.

[0009] Such chloroprene is defined in ASTM D6866 14 The biomass degree measured by C isotope measurement is preferably about 0.01% to 100%, more preferably about 0.1% to 80%, and even more preferably about 1% to 60%. By setting the biomass degree at or below the upper limit, chloroprene, which is a raw material for synthetic rubber, can be supplied more cheaply. On the other hand, by setting the biomass degree at or above the lower limit, it is easier to contribute to the realization of a carbon-recycling society.

[0010] Here, the biomass ratio means the ratio of carbon atoms derived from biomass contained in chloroprene. This biomass ratio is calculated by dividing the radiocarbon ( 14 This can be determined by measuring the amount of C) contained in chloroprene. The same applies to metal carbides and acetylene. In this specification, the biomass degree is defined in ASTM D6866. 14 Accelerator Mass Spectrometry (AMS), a type of C isotope measurement method, was used to measure the total carbon atoms contained in chloroprene. 14 It is determined by measuring the percentage of carbon (percent modern carbon: pMC) and calculating the percentage (content) of carbon atoms derived from biomass. The carbon atoms derived from biomass are preferably carbon atoms derived from at least one of charcoal, carbonized pulp, carbonized lignin, carbonized coconut shells, carbonized bagasse, and carbonized sorghum. The advantages of using charcoal as biomass will be described in detail later.

[0011] <Chloroprene manufacturing method> The above-mentioned chloroprene can be produced, for example, by the following method for producing chloroprene. In the method for producing chloroprene according to the present embodiment, acetylene containing carbon atoms derived from biomass is dimerized, and then reacted with hydrogen chloride to obtain chloroprene. 1. Synthesis of acetylene First, acetylene containing carbon atoms derived from biomass is synthesized. This acetylene is preferably obtained through the steps of preparing a carbon source containing biomass and a metal source, heating the carbon source and the metal source in an electric furnace to obtain metal carbide, and reacting the metal carbide with water. This method allows acetylene to be obtained relatively easily and in high yield. Here, the metal carbide is a compound represented by the chemical formula: MC or MC2 (M is a metal atom). Each step will be described below.

[0012] <<Preparation process>> First, a carbon source containing biomass and a metal source are prepared. Examples of biomass include plant-derived biomass, animal-derived biomass, etc. These waste materials may be used alone or in combination of two or more types. Examples of plant-derived biomass include felled trees, sawdust generated at sawmills, wood chips, and branches; agricultural crops such as corn, sugarcane, wheat, rice, soybeans, rapeseed, and sorghum; agricultural residues such as rice straw, wheat straw, corn stalks and leaves, coconut shells, and bagasse (sugarcane pomace); grasses (herbaceous plants) such as switchgrass and miscanthus; algae such as seaweed and microalgae; pulp; lignocelluloses such as lignin; fruit peels, seeds, and vegetable oils. Examples of biomass derived from animals include manure from livestock (such as cows, pigs, and chickens), livestock by-products such as bones or organs of livestock, and animal oils.

[0013] Note that biomass may be used after separation using a specific method. For example, lignocellulosic biomass may be prepared as biomass, and insoluble matter containing lignin (lignin-containing components) may be separated and recovered from this lignocellulosic biomass using a dilute sulfuric acid method or a concentrated sulfuric acid method. Biomass may be used as a carbon source as is, or the carbonized product obtained after carbonization may be used as a carbon source. The fixed carbon content in the carbon source can be adjusted, for example, by controlling the temperature (carbonization temperature) when carbonizing the biomass. Specifically, the fixed carbon (carbon atom) content in the carbon source is preferably about 85% by mass or more, more preferably about 90% by mass or more, and even more preferably about 95% by mass or more, and may be 100% by mass. In this case, metal carbide with a reduced impurity content can be obtained in high yield. The fixed carbon content in the carbon source can be measured according to JIS M 8812:2006.

[0014] Among the above, non-edible biomass, particularly carbonized non-edible biomass, is preferred as biomass because the use of non-edible biomass eliminates the need to consider competition with food. In particular, the biomass preferably contains at least one of charcoal, pulp carbonized material, lignin carbonized material (lignin-containing component carbonized material), coconut shell carbonized material, bagasse carbonized material, and sorghum carbonized material, more preferably charcoal and / or pulp carbonized material, and even more preferably charcoal. Charcoal is readily available and easy to handle, and therefore has the advantage of being easily mixed uniformly with coke when used in combination with coke. Furthermore, charcoal and pulp carbonized material do not contain phosphorus compounds, or contain only small amounts of them, so the content of impurities such as calcium phosphide (metal phosphide) in the resulting metal carbide can be sufficiently reduced. Therefore, when such metal carbide is used to produce acetylene, the generation of toxic substances such as phosphine derived from the impurities can be effectively prevented, resulting in a high level of safety.

[0015] Among charcoal, it is preferable to use hard charcoal, since hard charcoal is less likely to be crushed when mixed with coke or in the subsequent heating step, making it easier to produce metal carbide more stably. Specific examples of charcoal include white charcoal, black charcoal, sawdust charcoal, industrial charcoal, etc. These charcoals may be used alone or in combination of two or more types. Specifically, it is preferable that a sample cut out from the carbon source to a size of 35 mm×35 mm×10 mm has a crushing strength of about 30 kgf or more as measured in accordance with JIS Z 8841:1993.

[0016] Briquettes and molded charcoal produced by burning briquettes can also be suitably used as carbon sources. Such briquettes can be obtained by pulverizing and sizing biomass using a pulverizer to obtain pulverized biomass, mixing the pulverized biomass and a binder in a mixer, and then molding the mixture in a molding machine. The crushing strength of these carbon sources is preferably about 30 kgf or more, more preferably about 35 kgf or more, and even more preferably about 40 kgf or more. The upper limit of the crushing strength of the carbon source is not particularly limited, but is about 60 kgf. The crushing strength of the carbon source can be, for example, about 30 kgf or more and 60 kgf or less. This makes it possible to suitably prevent collapse of the carbon source during charging or in an electric furnace.

[0017] Such carbon sources preferably have a volatile content of about 5% by mass or less, more preferably about 4% by mass or less, and even more preferably about 3% by mass or less, as measured in accordance with JIS M 8812:2006. The lower limit of the volatile content of the carbon source is not particularly limited, but is about 0.01% by mass. The volatile content of the carbon source can be, for example, about 0.01% by mass or more and about 5% by mass or less. This can suitably prevent the carbon source from burning during storage, etc. The content of phosphorus atoms in the carbon source is preferably about 200 ppm or less, more preferably about 150 ppm or less, about 100 ppm or less, about 60 ppm or less, about 50 ppm or less, and even more preferably about 40 ppm or less. In this case, even when the resulting metal carbide is used to produce acetylene, the generation of toxic substances such as phosphine can be sufficiently prevented, and safety can be further improved.

[0018] However, if the carbon source contains a small amount of phosphorus atoms, the odor of phosphorus compounds derived from calcium phosphide (metal phosphide) can be detected, making it possible to detect the leakage of highly flammable acetylene. This also improves safety. Specifically, the content of phosphorus atoms in the carbon source is preferably about 0.1 ppm or more, more preferably about 0.5 ppm or more, about 1 ppm or more, about 5 ppm or more, about 10 ppm or more, about 15 ppm or more, or about 20 ppm or more, more preferably about 25 ppm or more, and even more preferably about 30 ppm or more. The content of phosphorus atoms in the carbon source can be, for example, about 0.1 ppm or more and about 200 ppm or less.

[0019] The content of sulfur atoms in the carbon source is preferably 0.1% by mass (1000 ppm) or less, more preferably about 800 ppm or less, even more preferably about 600 ppm or less, particularly preferably about 400 ppm or less, and most preferably about 200 ppm or less. In this case, the generation of hydrogen sulfide can be suppressed, thereby improving safety. The generation of sulfur oxides can also be suppressed, thereby reducing corrosion and other problems in production equipment for metal carbide and bioplastics. The lower limit of the content of sulfur atoms in the carbon source is not particularly limited, but is about 50 ppm. The content of sulfur atoms in the carbon source can be, for example, about 50 ppm or more and 1000 ppm or less. The contents of phosphorus atoms and sulfur atoms in the carbon source can be measured in accordance with JIS M 8813:2004.

[0020] The ash content in the carbon source is preferably about 13% by mass or less, more preferably about 10% by mass or less, even more preferably about 5% by mass or less, and particularly preferably about 3% by mass or less. In this case, even if the ash is a compound that is reduced in an electric furnace, the amount is small, so that wasteful consumption of the carbon source and electricity can be suitably prevented or suppressed. It is also possible to reduce the number of times the work of periodically removing (cleaning) the reduced ash accumulated at the bottom of the electric furnace is required. Furthermore, it is also possible to improve the purity of calcium hydroxide, which is a by-product when acetylene is generated by reacting metal carbide with water. The lower limit of the ash content in the carbon source is not particularly limited and may be 0% by mass. The ash content in the carbon source can be, for example, about 0% by mass or more and 13% by mass or less. Here, ash refers to the inorganic residue that remains when a carbon source is completely combusted in air (usually at a temperature of about 550°C or higher and 800°C or lower). The ash content in the carbon source can be measured in accordance with JIS M 8812:2006.

[0021] On the other hand, examples of the metal source include alkaline earth metal oxides, alkaline earth metal carbonates, alkaline earth metal hydroxides, alkaline earth metal sulfates, alkaline earth metal chlorides, etc. These metal sources may be used alone or in combination of two or more. The metal source preferably contains an oxide of an alkaline earth metal, and more preferably contains calcium oxide. Calcium oxide (CaO) is an unstable substance obtained, for example, by thermal decomposition of calcium carbonate (CaCO) at approximately 900°C. Therefore, calcium oxide is suitable as a metal source due to its high reactivity. As the metal carbide, calcium carbide, barium carbide, and magnesium carbide are preferred.

[0022] <<Heating process>> Next, the mixture of the carbon source and the metal source is placed in an electric furnace (carbide electric furnace) and heated, whereby the carbon source and the metal source are reacted to obtain metal carbide. The heating temperature is not particularly limited, but is preferably about 1700°C to 2200°C, and more preferably about 1900°C to 2100°C. The heating time is also not particularly limited, but when the heating temperature is set as above, it is preferably about 2 minutes to 3 hours, and more preferably about 30 minutes to 1.5 hours. Heating under such heating conditions allows the reaction between the carbon source and the metal source to proceed sufficiently.

[0023] The heating atmosphere is preferably an argon atmosphere, which can prevent unnecessary combustion of carbon monoxide and hydrogen generated during the reaction between the carbon source and the metal source. The amount of the carbon source relative to 100 parts by mass of the metal source is preferably about 30 parts by mass to 400 parts by mass, more preferably about 50 parts by mass to 300 parts by mass, and even more preferably about 70 parts by mass to 200 parts by mass. By carrying out the reaction at such a ratio, the yield of metal carbide can be sufficiently increased. The carbon source and the metal source are preferably in particulate form, which increases the contact area between the carbon source and the metal source and improves the reaction efficiency between them.

[0024] The average particle size of the carbon source is not particularly limited, but is preferably about 8 mm or more and 50 mm or less, more preferably about 8 mm or more and 30 mm or less, and even more preferably about 8 mm or more and 10 mm or less. The average particle size of the metal source is not particularly limited, but is preferably about 8 mm or more and 50 mm or less, more preferably about 8 mm or more and 30 mm or less, and even more preferably about 8 mm or more and 10 mm or less. In this specification, the average particle size refers to the particle size (D50) at which the cumulative value in the volume-based cumulative particle size distribution obtained by laser diffraction scattering is 50%. The laser diffraction scattering method is measured in accordance with the method described in JIS Z 8825:2013 "Particle size analysis - Laser diffraction and scattering method."

[0025] When biomass is used as a carbon source and combined with coke, combustion of the biomass, which has a lower ignition temperature than coke, is initiated first, and the heat from this combustion is expected to promote the combustion of the coke. As a result, the heating temperature can be smoothly adjusted to the above range, where the reaction between the carbon source and the metal source proceeds smoothly. This effect is particularly pronounced when charcoal is used as a biomass. Charcoal has a high ratio of carbon atoms to hydrogen atoms, making it suitable for use in combination with coke. Charcoal is also preferred because it has lower electrical conductivity than coke and is less likely to cause electrical short circuits in an electric furnace. Furthermore, the use of charcoal has the advantage of preventing a significant increase in the manufacturing cost of metal carbide, since it does not require significant changes to the configuration of the electric furnace or the addition of new manufacturing equipment.

[0026] Prior to the heating (main heating), the mixture may be preheated at a temperature lower than the heating temperature described above. By performing such preheating, the amount of carbon source consumed in the main heating can be reduced and the yield of metal carbide can be further increased. Examples of fuels for preheating include charcoal, which has a low ignition temperature among substances contained in the carbon source, and electric furnace gas (a mixed gas of carbon monoxide and hydrogen) emitted during main heating. Using charcoal as the fuel for preheating allows for a smooth transition from preheating to main heating. On the other hand, using electric furnace gas as the fuel for preheating allows for effective use of energy while favorably preventing air pollution. In this heating step, the biomass content of the resulting metal carbide can be adjusted by changing the mixing ratio of biomass (charcoal) and coke. Therefore, the mass balance method can appropriately respond to fluctuations in demand by simply changing the mixing ratio of biomass and coke according to the demand for biomass.

[0027] Furthermore, the gas containing at least carbon monoxide and hydrogen produced in the electric furnace in this heating step may be recovered. That is, the method for producing chloroprene may further include a step of recovering the gas containing at least carbon monoxide and hydrogen produced in the electric furnace. The recovered carbon monoxide and hydrogen may be used, for example, as an energy source for converting calcium carbonate to calcium oxide or an energy source for converting metal carbide to acetylene, or may be used to convert them into carbon compounds. In the latter case, the method for producing chloroprene may further include a step of reacting at least carbon monoxide with hydrogen to obtain a carbon compound, thereby enabling effective utilization of gases generated in the metal carbide production process. Examples of the carbon compound include acrylic acid, olefins (jet fuel), and acetylene black.

[0028] <<Acetylene production process>> Next, the metal carbide is reacted with water to produce acetylene. The amount of water added is preferably about 2 to 10 moles, more preferably about 2.5 to 5 moles, per mole of metal carbide, which allows the reaction between the metal carbide and water to proceed sufficiently. The temperature maintained during the reaction of metal carbide with water is preferably about 80° C. or higher and 200° C. or lower, and more preferably about 100° C. or higher and 180° C. or lower. By maintaining the reaction temperature within this range, evaporation of water can be suitably prevented and the reaction with the metal carbide can be allowed to proceed sufficiently.

[0029] The metal carbide may be in the form of a block, but is preferably in the form of particles. By using particulate metal carbide, the contact area with water can be increased, and as a result, the reaction between the metal carbide and water can proceed just right. In this case, the average particle size of the metal carbide is not particularly limited, but is preferably about 1 mm or more and 150 mm or less, and more preferably about 5 mm or more and 120 mm or less, which can further improve the above-mentioned effects.

[0030] The water that can be used includes, for example, tap water, distilled water, ion-exchanged water, pure water, ultrapure water, and RO water. Since the reaction between the metal carbide and water is an exothermic reaction, the generated heat may be recovered and used in the reaction between the carbon source and the metal source as described above. The slaked lime (calcium hydroxide) produced at this time can be suitably used as, for example, a cement admixture.

[0031] The metal carbide reacts with pure water to generate acetylene, and the content of sulfur atoms in the metal carbide is preferably about 100 ppm or less, more preferably about 90 ppm or less, even more preferably about 80 ppm or less, particularly preferably about 50 ppm or less, and may be 0 ppm. The metal carbide reacts with pure water to generate acetylene, and the content of phosphorus atoms in the metal carbide is preferably about 1 ppm or more and 320 ppm or less, more preferably about 5 ppm or more and 250 ppm or less, even more preferably about 10 ppm or more and 200 ppm or less, and particularly preferably about 20 ppm or more and 180 ppm or less. The metal carbide reacts with pure water to generate acetylene, and the ash content in the metal carbide is preferably about 10% by mass or less, more preferably about 8% by mass or less, even more preferably about 5% by mass or less, particularly preferably about 3% by mass or less, and may be 0% by mass.

[0032] 2. Dimerization of acetylene The acetylene is then dimerized to produce monovinylacetylene (MVA). The acetylene dimerization reaction (vinylation reaction) is usually carried out by continuously supplying acetylene gas at a predetermined rate to a predetermined amount of Nieuwland catalyst solution (a hydrochloric acid solution of cuprous chloride and ammonium chloride). The reaction temperature is preferably about 65°C or higher and 90°C or lower (specifically, about 72°C). Since the reaction rate is less than 5%, after the reaction is complete, the monovinylacetylene is separated from the acetylene by utilizing the difference in boiling points between the monovinylacetylene and acetylene.

[0033] 3. Chlorination of monovinylacetylene Next, monovinylacetylene is reacted with hydrogen chloride to obtain chloroprene. The chlorination reaction of monovinylacetylene is usually carried out in a toluene / water two-phase system by mixing a Nieuwland catalyst solution containing hydrogen chloride with a toluene solution containing monovinylacetylene. The reaction temperature is preferably about 30°C to 50°C (specifically, about 40°C). The reaction time is preferably about 30 minutes to 3 hours (specifically, about 1 hour). The reaction pressure is preferably normal pressure.

[0034] <Other methods for producing chloroprene> Chloroprene can also be synthesized by chlorinating butadiene containing carbon atoms derived from biomass, followed by dehydrochlorination. First, butadiene containing carbon atoms derived from biomass is synthesized. This butadiene can be obtained directly by microbial fermentation of biomass, or can be obtained by producing butanol by microbial fermentation of biomass and then subjecting the butanol to a dehydration reaction. The butadiene is then chlorinated by reaction with chlorine to obtain a mixture containing 1,4-dichloro-2-butene and 3,4-dichloro-1-butene.

[0035] The mixture is then heated in the presence of a catalyst to isomerize the 1,4-dichloro-2-butene and convert it to 3,4-dichloro-1-butene. Next, 3,4-dichloro-1-butene is dehydrochlorinated in an alkaline solution in the presence of a polymerization inhibitor to obtain chloroprene. The produced chloroprene is purified, for example, by distillation, to obtain high-purity chloroprene.

[0036] The chloroprene obtained as described above is usually polymerized by radical emulsion polymerization to obtain a chloroprene polymer (chloroprene rubber, chloroprene polymer), which is a polymer of chloroprene. For this polymerization, for example, rosin acid soap is used as an emulsifier and persulfate is used as a catalyst. The basic properties of the chloroprene rubber can be adjusted by the polymerization temperature and the molecular weight modifier. The vulcanized molded article of this embodiment includes a vulcanizate of a rubber composition, which contains the chloroprene polymer. The rubber composition may include a vulcanizing agent, a plasticizer, an antioxidant, a filler, a vulcanization accelerator, a vulcanization rate adjuster, a processing aid, a softener, a scorch inhibitor, etc. The vulcanized molded article is preferably a power transmission belt, a conveyor belt, a hose, a wiper, a dipped product, a sealing part, an adhesive, a boot, a rubber-coated fabric, a rubber roll, a vibration-proof rubber, or a sponge product.

[0037] The adhesive composition of this embodiment contains a chloroprene polymer latex, and this chloroprene polymer latex contains the above-mentioned chloroprene polymer. The adhesive composition may also contain a solvent, a metal oxide, a tackifier resin, an antioxidant, etc. The viscosity of the adhesive composition is preferably adjusted to about 3500 mPa·S or more and 4500 mPa·S or less. The composition for forming a dip-molded body of the present embodiment contains a chloroprene polymer latex, and the chloroprene polymer latex contains the above-mentioned chloroprene polymer. The composition for forming a dip-molded body may also contain a metal oxide, a heteroaromatic ring compound, an antioxidant, etc. The dip-molded article of this embodiment is a molded product of the above-mentioned composition for forming a dip-molded article. Such a dip-molded article is preferably an industrial or general household glove, a medical glove, a balloon, a catheter, or a boot. Furthermore, it may be provided in the following aspects.

[0038] (1) Chloroprene containing carbon atoms derived from biomass.

[0039] (2) In the chloroprene described in (1) above, the chloroprene specified in ASTM D6866 14 Chloroprene having a biomass content of 0.01% or more and 100% or less as measured by C isotope measurement.

[0040] (3) The chloroprene according to (1) or (2) above, wherein the carbon atom derived from biomass is a carbon atom derived from at least one of charcoal, carbonized pulp, carbonized lignin, carbonized coconut shell, carbonized bagasse, and carbonized sorghum.

[0041] (4) A method for producing chloroprene, comprising dimerizing acetylene containing a carbon atom derived from biomass, and then reacting the dimer with hydrogen chloride to obtain the chloroprene described in any one of (1) to (3).

[0042] (5) The method for producing chloroprene according to (4) above, wherein the acetylene is obtained through a step of preparing a carbon source containing biomass and a metal source, a step of heating the carbon source and the metal source in an electric furnace to obtain a metal carbide, and a step of reacting the metal carbide with water.

[0043] (6) The method for producing chloroprene according to (5) above, wherein the content of phosphorus atoms in the carbon source is 200 ppm or less.

[0044] (7) The method for producing chloroprene according to (6) above, wherein the content of the phosphorus atoms is 0.1 ppm or more.

[0045] (8) The method for producing chloroprene according to any one of (5) to (6) above, wherein the ash content in the carbon source is 13 mass % or less.

[0046] (9) The method for producing chloroprene according to any one of (5) to (8) above, wherein the content of sulfur atoms in the carbon source is 0.1 mass % or less.

[0047] (10) The method for producing chloroprene according to any one of (5) to (9) above, wherein the carbon source has a volatile content of 5 mass% or less as measured in accordance with JIS M 8812:2006.

[0048] (11) The method for producing chloroprene according to any one of (5) to (10) above, wherein the content of fixed carbon in the carbon source is 85 mass % or more.

[0049] (12) The method for producing chloroprene according to any one of (5) to (11) above, wherein the biomass contains at least one of charcoal, carbonized pulp, carbonized lignin, carbonized coconut shell, carbonized bagasse, and carbonized sorghum.

[0050] (13) The method for producing chloroprene according to any one of (5) to (12) above, wherein a sample cut out from the carbon source to a size of 35 mm × 35 mm × 10 mm has a crushing strength of 30 kgf or more as measured in accordance with JIS Z 8841:1993.

[0051] (14) The method for producing chloroprene according to any one of (5) to (13) above, wherein the metal source contains an oxide of an alkaline earth metal.

[0052] (15) The method for producing chloroprene according to any one of (5) to (14) above, further comprising a step of recovering a gas produced in the electric furnace and containing at least carbon monoxide and hydrogen.

[0053] (16) The method for producing chloroprene according to (15) above, further comprising the step of reacting at least the carbon monoxide with the hydrogen to obtain a carbon compound.

[0054] (17) The method for producing chloroprene according to any one of (5) to (16) above, wherein the biomass is pulverized and sized using a pulverizer to obtain pulverized biomass, the pulverized biomass and a binder are mixed using a mixer and then molded using a molding machine to obtain briquettes, and the briquettes are used as the carbon source.

[0055] (18) The method for producing chloroprene according to any one of (5) to (16) above, further comprising the steps of: preparing lignocellulosic biomass as the biomass; separating and recovering a lignin-containing component from the lignocellulosic biomass; carbonizing the lignin-containing component to obtain a carbonized lignin-containing component; and using the carbonized lignin-containing component as the carbon source.

[0056] (19) A chloroprene polymer, which is a polymer of the chloroprene described in any one of (1) to (3) above.

[0057] (20) A vulcanized molded article, comprising a vulcanizate of a rubber composition, the rubber composition containing the chloroprene-based polymer described in (19) above.

[0058] (21) The vulcanized molded article according to (20) above, which is a transmission belt, a conveyor belt, a hose, a wiper, a dipping product, a sealing part, an adhesive, a boot, a rubber-coated fabric, a rubber roll, a vibration-proof rubber, or a sponge product.

[0059] (22) An adhesive composition comprising a chloroprene polymer latex, the chloroprene polymer latex containing the chloroprene polymer described in (19) above.

[0060] (23) A composition for forming a dip-molded body, comprising a chloroprene polymer latex, the chloroprene polymer latex containing the chloroprene polymer described in (19) above.

[0061] (24) A dip-molded body, which is a molded product of the composition for forming a dip-molded body according to (23) above. Of course, this is not the case.

[0062] Finally, while various embodiments of the present disclosure have been described, they are presented as examples and are not intended to limit the scope of the invention. The novel embodiments may be embodied in various other forms, and various omissions, substitutions, and modifications may be made without departing from the spirit of the invention. Such embodiments and modifications are intended to be included within the scope and spirit of the invention, as well as within the scope of the inventions and their equivalents as defined in the claims. [Example]

[0063] Chloroprene, a method for producing chloroprene, and chloroprene rubber will be described in more detail below using the following examples and comparative examples, but the invention is not limited to these examples.

[0064] 1. Preparation of raw materials <Carbon source> White charcoal: Kishu Binchotan, manufactured by South Sky Nara charcoal: Charcoal manufactured by Yachi Forestry Co., Ltd. Sawdust charcoal: "Sawdust Binchotan" manufactured by Pearl Metal Co., Ltd. Palm kernel shells: PKS (Palm Kernel Shells) manufactured by EneLab Japan Bagasse: Dried bagasse manufactured by Bagasse Garden Co., Ltd. Anthracite: Vietnamese Hon Gay coal Wood chips: Komeri Natural Season Blend Smoking Chips (Value Pack) The white charcoal, Nara black charcoal, sawdust charcoal and anthracite were each crushed and sieved to an average particle size of about 10 mm before use. <Calcium source (metal source)> Calcium oxide: 99.9% calcium oxide, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd. <Barium source (metal source)> Barium carbonate: 99.9% barium carbonate, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.

[0065] 2. Production of metal carbides, acetylene and chloroprene Example 1 First, 111 parts by mass of white charcoal as a carbon source and 155 parts by mass of calcium oxide as a calcium source were mixed to obtain a mixture so that the amount of fixed carbon charged was 100 parts by mass. Next, this mixture was placed in a multipurpose high-temperature furnace (Fuji Denpa Kogyo Co., Ltd., "Hi-Multi Series") and heated at 2000°C for 1 hour while flowing argon at a rate of 7 L / hr. This produced calcium carbide. The average particle size of the resulting calcium carbide was 10 mm. Then, 2.5 moles of distilled water was added to 1 mole of calcium carbide to produce acetylene, while the reaction temperature was maintained at 120°C.

[0066] Next, acetylene gas was continuously supplied at a rate of 15.0 L / min to 2000 mL of Nieuwland catalyst solution with a copper concentration of 8.6 mol / L to carry out the dimerization reaction. The resulting acetylene / monovinylacetylene mixed gas was cooled to -20°C, and monovinylacetylene was separated and recovered. Next, a solution was prepared by dissolving 5.0 mol / L of hydrogen chloride in a Niewland catalyst solution with a copper concentration of 8.6 mol / L. Then, 1000 mL of a toluene solution containing 16% by volume of monovinylacetylene was added to 2000 mL of this solution, and the reaction was carried out at normal pressure and 40°C for 1 hour. This produced chloroprene.

[0067] Example 2 Calcium carbide, acetylene and chloroprene were obtained in the same manner as in Example 1, except that 133 parts by mass of black charcoal was used as the carbon source. Example 3 Calcium carbide, acetylene and chloroprene were obtained in the same manner as in Example 1, except that 111 parts by mass of sawdust charcoal was used as the carbon source.

[0068] Example 4 Calcium carbide, acetylene and chloroprene were obtained in the same manner as in Example 1, except that 56 parts by mass of white charcoal and 59 parts by mass of anthracite were used as the carbon source. Example 5 Calcium carbide, acetylene and chloroprene were obtained in the same manner as in Example 1, except that 11 parts by mass of white charcoal and 106 parts by mass of anthracite were used as the carbon source.

[0069] Example 6 Calcium carbide, acetylene and chloroprene were obtained in the same manner as in Example 1, except that 1 part by mass of white charcoal and 116 parts by mass of anthracite were used as the carbon source.

[0070] Example 7 Coconut shells were placed in a multipurpose high-temperature furnace (Fuji Denpa Kogyo Co., Ltd., "High Multi Series") and heated at 800°C while flowing argon at a rate of 7 L / hr until the fixed carbon reached 90% by mass, yielding coconut shell charcoal. Next, 111 parts by mass of coconut shell charcoal and 195 parts by mass of calcium oxide as a calcium source were mixed to obtain a mixture. This mixture was then placed in a multipurpose high-temperature furnace and heated at 2000°C for 1 hour while flowing argon at a rate of 7 L / hr. This yielded calcium carbide. The resulting calcium carbide was then used to produce acetylene and chloroprene in the same manner as in Example 1.

[0071] Example 8 Bagasse was placed in a multipurpose high-temperature furnace (Fuji Denpa Kogyo Co., Ltd., "High Multi Series") and heated at 800°C while flowing argon at a rate of 7 L / hr until the fixed carbon content reached 90% by mass, yielding bagasse char. Next, 111 parts by mass of the bagasse char was mixed with 195 parts by mass of calcium oxide as a calcium source to obtain a mixture. This mixture was then placed in a multipurpose high-temperature furnace and heated at 2000°C for 1 hour while flowing argon at a rate of 7 L / hr. This yielded calcium carbide. The resulting calcium carbide was then used to produce acetylene and chloroprene in the same manner as in Example 1.

[0072] Example 9 The bagasse charcoal obtained in Example 8 was pulverized using a disk mill to obtain bagasse charcoal powder (pulverized bagasse charcoal) with an average particle size of 350 μm. Next, 100 parts by mass of the bagasse charcoal powder and 8 parts by mass of asphalt binder were mixed in a batch mixer until the moisture content reached 7% by mass. This mixture was then molded at a linear pressure of 10 kN / cm using a double-roll molding machine with recesses measuring 34.8 mm x 30 mm x 9.4 mm to obtain bagasse charcoal briquettes. After measuring the crushing strength, 111 parts by mass of the bagasse charcoal briquettes were mixed with 195 parts by mass of calcium oxide as a calcium source to obtain a mixture. This mixture was then placed in a multipurpose high-temperature furnace and heated at 2000 °C for 1 hour while flowing argon at a rate of 7 L / hr. This produced calcium carbide. The resulting calcium carbide was then used to produce acetylene and chloroprene in the same manner as in Example 1.

[0073] Example 10 Wood chips were hydrolyzed using concentrated sulfuric acid, and then the residue was collected by filtration. The resulting residue was washed with hot water at 80°C, followed by acetone, ethyl acetate, and toluene to obtain wood chip-derived lignin. The obtained wood chip-derived lignin was then placed in a multipurpose high-temperature furnace (Fuji Denpa Kogyo Co., Ltd., "High Multi Series") and heated at 800°C while flowing argon at a rate of 7 L / hr until the fixed carbon reached 90% by mass, thereby obtaining wood chip-derived lignin carbonized material. Next, 111 parts by mass of the wood chip-derived lignin carbonized material and 195 parts by mass of calcium oxide as a calcium source were mixed to obtain a mixture. Next, this mixture was placed in a multipurpose high-temperature furnace and heated at 2000°C for 1 hour while flowing argon at a rate of 7 L / hr. This produced calcium carbide. The obtained calcium carbide was then used to obtain acetylene and chloroprene in the same manner as in Example 1.

[0074] Example 11 The wood chip-derived lignin obtained in Example 10 was heated at 300°C to obtain wood chip-derived lignin semi-carbonized material. 100 parts by mass of the wood chip-derived lignin semi-carbonized material and 8 parts by mass of asphalt binder were mixed in a batch mixer to obtain wood chip-derived lignin semi-carbonized pellets. The wood chip-derived lignin semi-carbonized pellets were then placed in a multipurpose high-temperature furnace (Fuji Denpa Kogyo Co., Ltd., "High Multi Series"), and heated at 800°C under a reduced pressure of 10 Pa at 20 MPa using a press until the fixed carbon reached 90% by mass, thereby obtaining wood chip-derived lignin molded charcoal. Next, 111 parts by mass of the wood chip-derived lignin molded charcoal and 195 parts by mass of calcium oxide as a calcium source were mixed to obtain a mixture. This mixture was then placed in a multipurpose high-temperature furnace and heated at 2000°C for 1 hour while flowing argon at a rate of 7 L / hr. This produced calcium carbide. Thereafter, acetylene and chloroprene were obtained in the same manner as in Example 1 using the obtained calcium carbide.

[0075] Example 12 A mixture was obtained by mixing 111 parts by mass of the wood chip-derived lignin carbonized material obtained in Example 10 with 411 parts by mass of barium carbonate as a barium source. This mixture was then placed in a multipurpose high-temperature furnace and heated at 1550°C for 1 hour while flowing argon at a rate of 7 L / hr. This produced barium carbide. The resulting barium carbide was then used to produce acetylene and chloroprene in the same manner as in Example 1.

[0076] (Comparative Example) Calcium carbide, acetylene and chloroprene were obtained in the same manner as in Example 1, except that 118 parts by mass of anthracite was used as the carbon source.

[0077] 3. Measurement 3-1. Measurement of biomass level The biomass carbon sources used in each of the Examples and Comparative Examples, and the metal carbides, acetylene, and chloroprene obtained in each of the Examples and Comparative Examples were each measured by accelerator mass spectrometry (AMS) in accordance with ASTM D6866, and the biomass degree was calculated according to the following formula. Biomass content (%) = biomass carbon source, metal carbide, acetylene or chloroprene 14 Mass of C / Mass of all carbon atoms in biomass carbon source, metal carbide, acetylene, or chloroprene × 100

[0078] 3-2. Measurement of phosphorus and sulfur atom contents in biomass carbon sources and anthracite The contents of phosphorus atoms and sulfur atoms (phosphorus content and sulfur content) in the biomass carbon source and the anthracite were measured in accordance with JIS M 8813:2004. 3-3. Measurement of carbon atom (fixed carbon) content in biomass carbon sources and anthracite The carbon atom content (fixed carbon content) in the biomass carbon source and anthracite was measured in accordance with JIS M 8812:2006.

[0079] 3-4. Measurement of ash content in biomass carbon sources The ash content in the biomass carbon source (ash content) was measured according to JIS M 8812:2006. 3-5. Measurement of crushing strength of biomass carbon sources The biomass carbon source was molded into a sample measuring 35 mm x 35 mm x 10 mm, and the crushing strength of this sample was measured in accordance with JIS Z 8841:1993.

[0080] 3-6. Measurement of phosphorus atom content in metal carbide Acetylene gas was generated from the metal carbide according to JIS K 1901:2003. The phosphine content in the acetylene gas (phosphine content) was measured according to JIS K 1901:2003. The phosphorus atom content in the metal carbide (phosphorus content) was calculated from the phosphine content in the acetylene as follows.

number

[0081] 3-7. Measurement of sulfur atom content in metal carbide Acetylene gas was generated from the metal carbide in accordance with JIS K 1901:2003. The hydrogen sulfide content in the acetylene gas (hydrogen sulfide content) was measured in accordance with JIS K 1901:2003. The content of sulfur atoms in the metal carbide (sulfur content) was calculated from the hydrogen sulfide content in the acetylene as follows.

number

[0082] 3-8. Measurement of ash content in metal carbide Calcium hydroxide was obtained by reacting 100 parts by mass of calcium carbide from Examples 1 to 11 and Comparative Example with 58 parts by mass of pure water. The obtained calcium hydroxide was dried at 150°C until the water content was 0.1% by mass or less. The purity of the calcium hydroxide was measured in accordance with JIS K 8575:2025. Barium hydroxide was obtained by reacting 100 parts by mass of the barium carbide of Example 12 with 30 parts by mass of pure water. The obtained barium hydroxide was dried at 150°C until the water content was 0.1% by mass or less. The purity of the barium hydroxide was measured according to JIS K 1417-1992. The ash content in the metal carbide was calculated from the purity of calcium hydroxide or the purity of barium hydroxide measured as described above as follows.

number

[0083] The results are shown in Tables 1 and 2 below. [Table 1]

[0084] [Table 2]

[0085] As shown in Tables 1 and 2, it was confirmed that acetylene and chloroprene that reflect the biomass degree of the metal carbide can be produced. Furthermore, it was confirmed that acetylene and chloroprene with a biomass degree according to the mass balance can be produced. Furthermore, when the chloroprene obtained in each of the Examples and Comparative Examples is used to produce chloroprene rubber, it is possible to produce chloroprene rubber to the same extent.

Claims

1. Chloroprene, Chloroprene, which contains carbon atoms derived from biomass.

2. The chloroprene according to claim 1, Specified in ASTM D6866 １４ Chloroprene having a biomass ratio of 0.01% or more and 100% or less as measured by C isotope measurement.

3. The chloroprene according to claim 1, Chloroprene, wherein the biomass-derived carbon atom is a carbon atom derived from at least one of charcoal, carbonized pulp, carbonized lignin, carbonized coconut shell, carbonized bagasse, and carbonized sorghum.

4. A method for producing chloroprene, comprising: A method for producing chloroprene, comprising dimerizing acetylene containing a carbon atom derived from biomass and then reacting the dimer with hydrogen chloride to obtain the chloroprene according to any one of claims 1 to 3.

5. The method for producing chloroprene according to claim 4, The method includes the steps of: providing a carbon source including biomass and a metal source; a step of heating the carbon source and the metal source in an electric furnace to obtain a metal carbide; and reacting the metal carbide with water.

6. The method for producing chloroprene according to claim 5, The method for producing chloroprene, wherein the content of phosphorus atoms in the carbon source is 200 ppm or less.

7. The method for producing chloroprene according to claim 6, The method for producing chloroprene, wherein the content of phosphorus atoms is 0.1 ppm or more.

8. The method for producing chloroprene according to claim 5, The method for producing chloroprene, wherein the carbon source has an ash content of 13 mass% or less.

9. The method for producing chloroprene according to claim 5, The method for producing chloroprene, wherein the content of sulfur atoms in the carbon source is 0.1 mass% or less.

10. The method for producing chloroprene according to claim 5, The method for producing chloroprene, wherein the carbon source has a volatile content of 5 mass% or less as measured in accordance with JIS M 8812:2006.

11. The method for producing chloroprene according to claim 5, The method for producing chloroprene, wherein the content of fixed carbon in the carbon source is 85 mass% or more.

12. The method for producing chloroprene according to claim 5, The method for producing chloroprene, wherein the biomass includes at least one of charcoal, carbonized pulp, carbonized lignin, carbonized coconut shell, carbonized bagasse, and carbonized sorghum.

13. The method for producing chloroprene according to claim 5, A sample cut out from the carbon source to a size of 35 mm x 35 mm x 10 mm has a crushing strength of 30 kgf or more as measured in accordance with JIS Z 8841:1993.

14. The method for producing chloroprene according to claim 5, The method for producing chloroprene, wherein the metal source comprises an oxide of an alkaline earth metal.

15. The method for producing chloroprene according to claim 5, The method for producing chloroprene further comprises a step of recovering a gas produced in the electric furnace and containing at least carbon monoxide and hydrogen.

16. The method for producing chloroprene according to claim 15, The method for producing chloroprene further comprises a step of reacting at least the carbon monoxide with the hydrogen to obtain a carbon compound.

17. The method for producing chloroprene according to claim 5, The biomass is pulverized and sized using a pulverizer to obtain pulverized biomass, the pulverized biomass and a binder are mixed using a mixer, and then molded using a molding machine to obtain briquettes, and the briquettes are used as the carbon source.

18. The method for producing chloroprene according to claim 5, A method for producing chloroprene, comprising: preparing lignocellulosic biomass as the biomass; separating and recovering lignin-containing components from the lignocellulosic biomass; carbonizing the lignin-containing components to obtain lignin-containing component carbonized materials; and using the lignin-containing component carbonized materials as the carbon source.

19. A chloroprene-based polymer, A chloroprene-based polymer, which is a polymer of the chloroprene according to any one of claims 1 to 3.

20. A vulcanized molded article, a vulcanizate of the rubber composition, A vulcanization molded article, wherein the rubber composition contains the chloroprene polymer according to claim 19.

21. The vulcanized molded article according to claim 20, The vulcanized molded article is a transmission belt, a conveyor belt, a hose, a wiper, a dipping product, a sealing part, an adhesive, a boot, a rubber-coated fabric, a rubber roll, a vibration-proof rubber, or a sponge product.

22. An adhesive composition comprising: Contains chloroprene polymer latex, An adhesive composition, wherein the chloroprene polymer latex contains the chloroprene polymer according to claim 19.

23. A composition for forming a dip-molded body, Contains chloroprene polymer latex, A composition for forming a dip-molded body, wherein the chloroprene polymer latex contains the chloroprene polymer according to claim 19 .

24. A dip-molded body, A dip-molded body, which is a molded product of the composition for forming a dip-molded body according to claim 23.

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