Abstract: The present invention relates to a printing device and a printing method. The combination mode between materials in an additive manufacturing process is improved. A calculation unit is used for controlling an A pole unit and a B pole unit to be in contact with the materials, to form an energized circuit. The surface temperature of phase change material in the material between the A pole unit and the B pole unit is greater than or equal to a preset temperature so that the materials at a distance can be simultaneously combined.

Abstract: A process and a device for continuous flow side-chain alkylation which relate to the technical field of organic synthesis. In this process and the device for continuous flow side-chain alkylation, an ibuprofen raw material is prepared with alkylbenzene as a raw material. This raw material alkylbenzene is easily available and has a low cost, and is suitable for scale-up production. Moreover, an entire preparation process adopts continuous chemical synthesis, and a reaction time of each stage can be precisely controlled, which is beneficial to control a total reaction time and reduce an amount of impurities produced. In this way, a purity and a yield of the ibuprofen raw material are improved. In summary, a continuous synthesis method for side-chain alkylation of alkylbenzene provided by the present disclosure shows a low cost and a high yield.

Abstract: Disclosed are an iron-based catalyst and its application catalytic diene polymerization. The iron-based catalyst provided by the present application includes iron-containing organic compounds, alkyl aluminum compounds and isocyanide-containing organic compounds, and the molar ratio between the iron element of the iron-containing organic compounds, the alkyl aluminum compounds and the isocyanide-containing organic compounds is 1:(5˜100):(0.5˜100). The iron-based catalyst system of the present application can initiate polymerization of diene with high activity at high temperature by using isocyanide-containing organic compounds as an electron donor and alkyl aluminum compounds as a co-catalyst.

Abstract: Disclosed is a method of adjusting the molecular weight of syndiotactic 1,2-polybutadiene prepared using an iron-based catalyst. In the present application, when an iron-based catalyst catalyzes the polymerization of butadiene to prepare syndiotactic 1,2-polybutadiene, alpha-olefins are added as a molecular weight regulator, and a chain transfer effect is achieved through competitive adsorption. At the same time, since alpha-olefins are stable to iron-based catalysts, cannot be initiated to polymerize, and are easy to separate from butadiene, they have a significant effect on molecular weight regulation and do not have a significant effect on activity, making it possible to prepare syndiotactic 1,2-polybutadiene thermoplastic elastomers with number average molecular weights ranging from 3,000-250,000. The syndiotactic 1,2-polybutadiene rubber prepared by the present application has better processability.

Abstract: A system and method for determining a critical suspension speed of an impeller in a solid-liquid stirred tank belongs to the technical field of critical speed determination. A relationship is established between a voltage of a measurement electrode and a solid-liquid suspension state to avoid the problems of strong subjectivity and large deviation appearing in existing critical suspension speed determination based on empirical formulas and human eye observation. An electrode voltage ratio is taken as a determination criterion, which is only related to a spatial density of solid particles in a liquid phase.

Abstract: For the defects that manual adhesive tape pasting is low in efficiency and high in cost, and it is difficult to automatically paste adhesive tapes at specified positions of inner and outer surfaces of an item according to a certain length through a handheld box sealer and an adhesive tape seal pasting mechanism, a cantilever type plane automatic adhesive tape pasting device is invented. A liftable two-stage telescopic cantilever adhesive tape pasting head structure, a roller type automatic adhesive tape feeding structure, an adjustable fixed-length cutting structure and a roller type pasting structure are adopted for the device to achieve the automatic adhesive tape pasting on inner and outer side planes of an item. After the item needing adhesive tape pasting is positioned, the pasting process is completely automatically conducted without manual participation, the labor intensity is reduced, the labor efficiency is improved.

Abstract: An online measurement device for crystal size and shape in a high-solid-content crystallization process includes a solution amplifier, a measurement device, a peristaltic pump, a crystallization kettle, a dilution device and a solution storage tank. A crystal-containing solution is arranged in the crystallization kettle; an inner wall of the solution amplifier is smooth, one end is an amplification end, and the other end is a contraction end. The contraction end is communicated with one end of the solution storage tank and one end of the crystallization kettle. The amplification end is communicated with the dilution device and the peristaltic pump. The peristaltic pump is communicated with the other end of the crystallization kettle. The solution amplifier, the peristaltic pump and the crystallization kettle form a complete passage through a pipeline. A measurement instrument of the measurement device is arranged at the outer side of the solution amplifier.

Abstract: Disclosed are a high temperature blasting resistance isotactic polybutene alloy and a preparation method thereof. The isotactic polybutene alloy of the present invention comprises 1-40% of isotactic polypropylene in parts by mass, 0.1-10% of a polypropylene-polybutene-1 block copolymer in parts by mass, 35-95.9% of isotactic polybutene-1 of a medium molecular weight in parts by mass, and 3-15% of isotactic polybutene-1 of a high molecular weight in parts by mass. The alloy material is prepared using a method of segmented polymerization of propylene polymerization, high hydrogen content butene polymerization and low hydrogen content butene polymerization. The prepared isotactic polybutene alloy has excellent high temperature blasting resistance and high temperature hydrostatic pressure, is high in vicat softening temperature, and is applicable to pressure pipes.

Abstract: The present invention discloses a synthesis method of lactide by confinement effect catalysis of crystalline porous polymer material, wherein the method comprising: (I) synthesis of catalyst; (II) synthesis of lactide by confinement effect catalysis; and (III) purification of lactide. In the present invention, a yield of L-lactide by catalysis of L-lactic acid by crystalline polymers is as high as 85.6%, which is 10% higher than the yield of lactide by H-? molecular sieve reported in documents currently available; it is easy to prepare the crystalline porous polymer material catalyst, which is environmental friendly, has a high yield and is recyclable, for consecutive 7 times the catalysis yield is maintained to be higher than 70%, and catalysis yield conservation rate is far higher than catalysis effects of catalysts reported in documents currently available.

Abstract: The present disclosure relates to the technical field of preparation of syndiotactic 1,2-polybutadiene (s-PB), in particular to a catalytic system and use thereof, and a preparation method of s-PB. In the present disclosure, the catalytic system includes an iron-containing organic compound, an azodicyano compound, an organoaluminum compound, and a free radical scavenger; where an iron element in the iron-containing organic compound, the azodicyano compound, the organoaluminum compound, and the free radical scavenger have a molar ratio of 1:(0.5-10):(5-100):(1-1000); and the free radical scavenger is selected from the group consisting of a sterically hindered phenol, a sterically hindered amine, and a phosphorus-containing antioxidant. The catalytic system can prepare the s-PB with a high activity at a high temperature, and the s-PB has a melting point of 60° C. to 130° C. with an extremely low gel content or even no gelation.

Abstract: Disclosed is a method for preparing a carbon material, comprising applying a voltage to an electrically conductive medium to form an electrically conductive path in an oxygen-free environment containing a carbon source and a catalyst to obtain the carbon material, wherein the electrically conductive medium includes a solid substrate or a liquid-phase electrically conductive system; under the condition that the electrically conductive medium is the liquid-phase electrically conductive system, the carbon material is obtained in the liquid-phase electrically conductive system; and under the condition that the electrically conductive medium is the solid substrate, the carbon material is obtained on a surface of the solid substrate.

Abstract: A process and a device for continuous flow side-chain alkylation which relate to the technical field of organic synthesis. In this process and the device for continuous flow side-chain alkylation, an ibuprofen raw material is prepared with alkylbenzene as a raw material. This raw material alkylbenzene is easily available and has a low cost, and is suitable for scale-up production. Moreover, an entire preparation process adopts continuous chemical synthesis, and a reaction time of each stage can be precisely controlled, which is beneficial to control a total reaction time and reduce an amount of impurities produced. In this way, a purity and a yield of the ibuprofen raw material are improved. In summary, a continuous synthesis method for side-chain alkylation of alkylbenzene provided by the present disclosure shows a low cost and a high yield.

Abstract: The present disclosure belongs to the technical field of chemical separation and purification, and in particular relates to a purification method and device for continuous distillation and separation of an ibuprofen intermediate raw material. The purification method comprises the following steps: carrying out a primary distillation on synthetic liquid to obtain a primary material and recovered 4-methyl-1-pentene, then carrying out a second-stage distillation on the primary material to obtain a second-stage material and a recovered crude toluene product; and carrying out a third-stage distillation on the second-stage material to obtain isobutyl benzene and a recovered crude n-butylbenzene product. Embodiment results show that the purification method provided by the present disclosure is high in product recovery rate and high in product purity, the purity of isobutyl benzene is up to 99.99 wt %, the recovery rate is up to 99.9 wt %, the impurity content is not higher than 50 ppm.

Abstract: The present disclosure provides an active zinc-based catalyst and a preparation method thereof, and use in catalyzing a rearrangement reaction of ibuprofen. The active zinc-based catalyst includes a carbon-based fiber material and nano-zinc oxide supported on a fiber surface of the carbon-based fiber material. The active zinc-based catalyst is introduced with the carbon-based fiber material, and the carbon-based fiber material is capable of increasing a specific surface area of the catalyst, thereby improving a dispersion degree of zinc oxide, increasing the number of catalytic active sites, and significantly improving a catalytic activity. Meanwhile, due to a certain mechanical strength, the carbon-based fiber material is capable of improving a mechanical strength of the catalyst, making the catalyst exist stably in ketal fluid, maintaining a stable morphology of the catalyst, and avoiding or inhibiting reduction of the catalytic active sites, thereby ensuring a catalytic stability.

Abstract: The present disclosure belongs to the technical field of chemical separation and purification, and in particular relates to a purification method and device for continuous distillation and separation of an ibuprofen intermediate raw material. The purification method comprises the following steps: carrying out a primary distillation on synthetic liquid to obtain a primary material and recovered 4-methyl-1-pentene, then carrying out a second-stage distillation on the primary material to obtain a second-stage material and a recovered crude toluene product; and carrying out a third-stage distillation on the second-stage material to obtain isobutyl benzene and a recovered crude n-butylbenzene product. Embodiment results show that the purification method provided by the present disclosure is high in product recovery rate and high in product purity, the purity of isobutyl benzene is up to 99.99 wt %, the recovery rate is up to 99.9 wt %, the impurity content is not higher than 50 ppm.

Abstract: A system for a deep-sea planktonic microorganism in-situ concentration, temperature maintaining and pressure maintaining sampling is provided and includes a sampling cylinder body with double layer structures, the sampling cylinder body is provided with a plug-shaped inner cavity, the plug-shaped inner cavity is provided with a transfer water outlet and a water inlet connected to a water inlet component, the plug-shaped inner cavity is connected to an end cover, the plug-shaped inner cavity is connected to a filter part, the sampling cylinder body is provided with a sampling water outlet, the sampling water outlet is respectively connected to a pressure maintaining device and a water outlet pipe, a temperature maintaining material layer and a temperature control component are connected between the double layer structures, and the temperature control component is electrically connected to a controller. The system can complete sampling on the premise of maintaining in-situ pressure of samples.

Abstract: The present disclosure provides an active zinc-based catalyst and a preparation method thereof, and use in catalyzing a rearrangement reaction of ibuprofen. The active zinc-based catalyst includes a carbon-based fiber material and nano-zinc oxide supported on a fiber surface of the carbon-based fiber material. The active zinc-based catalyst is introduced with the carbon-based fiber material, and the carbon-based fiber material is capable of increasing a specific surface area of the catalyst, thereby improving a dispersion degree of zinc oxide, increasing the number of catalytic active sites, and significantly improving a catalytic activity. Meanwhile, due to a certain mechanical strength, the carbon-based fiber material is capable of improving a mechanical strength of the catalyst, making the catalyst exist stably in ketal fluid, maintaining a stable morphology of the catalyst, and avoiding or inhibiting reduction of the catalytic active sites, thereby ensuring a catalytic stability.

Abstract: The present disclosure belongs to the field of energy materials, and relates to a preparation method of a solid electrolyte, in particular to a method for forming a membrane by using an electrolyte to activate a porous powder material prepared by in-situ polymerization of a polymer on the surfaces of cellulose nanocrystals, and then hot-pressing. According to the technical solution of the present disclosure, cellulose nanocrystals are used as templates, the powder material with a porous structure is prepared by in-situ polymerization growth of the polymer on the surfaces of the cellulose nanocrystals, a small amount of electrolyte is used to activate the powder, and the solid electrolyte is prepared by hot-pressing membrane formation. The solid electrolyte prepared by the present disclosure has excellent electrochemical performance and mechanical performance, and a broad application prospect.

Abstract: Disclosed is a system and a method for electrospinning superfine fiber bundling, belonging to the technical field of artificial fiber manufacturing, and comprises a spinning nozzle and a bundling disk which are coaxially arranged; the spinning nozzle is arranged at an upper part of the bundling disk; the bundling disk is connected with a motor through a coupling; the motor rotates to drive the bundling disk to rotate; a guide groove is also arranged outside the bundling disk; a center of the bundling disk is provided with a shaft; the insulated outer ring, the central conductive ring, the insulated inner ring and the shaft are fixed by bonding or thermal compounding; inner and outer edges of the central conductive ring are smooth circular arc rounded corners; an inner edge of the insulated outer ring and an outer edge of the insulated inner ring are corresponding smooth rounded corners.

Abstract: The present invention relates to a printing device and a printing method. The combination mode between materials in an additive manufacturing process is improved. A calculation unit is used for controlling an A pole unit and a B pole unit to be in contact with, the materials, to form an energized circuit. The surface temperature of phase change material in the material between the A pole unit and the B pole unit is greater than or equal to a preset temperature so that the materials at a distance can be simultaneously combined.