68results about How to "High bulk density" patented technology

The invention relates to a method for preparing a lithium iron phosphate / carbon composite material of a lithium ion battery, which belongs to the technical field of lithium ion batteries. The method for preparing the lithium iron phosphate / carbon composite material of the lithium ion battery comprises the following steps of: 1) preparing a suspending graphene-dispersed aqueous solution system, namely, crushing graphite to 1 to 5 microns, adding the crushed graphite into distilled water or purified water, adding 0.1 to 5 percent of surfactant, heating with stirring the mixed solution to 180 to 250 DEG C in a sealing way, performing stirring for 2 to 6 hours and reducing the temperature; 2) crushing lithium iron phosphate to the particle size of 1 to 5 microns, adding the crushed lithium iron phosphate into the distilled water or the purified water, adding with stirring 0.01 to 1 percent of coupling agent, performing uniform stirring, adding the graphene-dispersed aqueous solution, and performing stirring and filtration; and 3) vacuum-drying solid powder obtained by the filtration, and calcinating the dried solid powder for 2 to 12 hours to obtain the graphene-coated lithium iron phosphate cathode material. The method has the advantages of simple process, high material performance, high conductivity, high bulk density, high compacted density and the like.

The utility model provides a kind of seed dressing device before peanut sowing, belong to peanut sowing technical field. Including seed dressing jar body, the periphery of seed dressing jar body is fixed with fixed frame, and the upper side of seed dressing jar body is provided with feed inlet, the side of fixed frame is fixed with extension frame, and the inside and outside of extension frame upper side and seed dressing jar body are jointly installed with even sprinkling irrigation mechanism. The utility model is by being provided with even sprinkling irrigation mechanism, personnel can pour peanut seed from feed inlet into seed dressing jar body in advance during operation, then personnel will need to mix seed dressing agent with a variety of raw materials and other liquids etc. in turn from feeding pipe into mixing cylinder, then start first motor to make first driving rod with periphery staggered distribution set of stirring rod to mix the above-mentioned variety of materials, after mixing and stirring are finished, personnel can start conveying pump body, and can be conveyed to sprinkling irrigation ring pipe frame and be sprayed by thus inside ring distribution set of sprinkling irrigation head under the guidance of first pipeline, second pipeline etc. component with seed dressing agent.

This invention relates to the field of catalysts, specifically to a polyethylene catalyst and its preparation method, as well as ultra-high molecular weight polyethylene and its preparation method. The method includes the following steps: (1) under diluent conditions, a magnesium halide precursor, an alcohol compound, and a first internal electron donor undergo a first contact reaction to obtain a first reaction solution; (2) a second internal electron donor is added to the first reaction solution to undergo a second contact reaction to obtain a second reaction solution; (3) a titanium precursor is added to the second reaction solution to undergo a third contact reaction to obtain a third reaction solution; (4) a haloalkane is added to the third reaction solution, followed by a third internal electron donor to undergo a fourth contact reaction. The catalyst prepared by this invention exhibits good catalytic performance.

The application relates to the technical field of special functional coating materials for lost foam casting, and particularly discloses a cast iron lost foam and universal coating for full mold casting and application thereof. The cast iron lost foam and universal coating for full mold casting comprises quartz powder, calcined bauxite, modified fly ash microbeads, microcrystalline graphite and an additive; the modified fly ash microbeads comprise fly ash and a composite coating layer coated on the surface of the fly ash, and the composite coating layer comprises aluminum oxide nanosheets and magnesium ion doped amorphous substances. Through functional design of key components, the coating can dynamically adjust its performance according to the temperature and chemical environment of the contact interface, can meet the high air permeability requirement of the lost foam process, can take into account the differentiated requirements of different cast iron materials on high-temperature strength, permeability resistance and interface purity, and can be compatible with both conventional negative pressure and non-negative pressure conditions, so that the universal coating is realized, and production management and supply chain processes are greatly simplified.

The application provides a 3D printing method for preparing a low-cost TA15 part based on a bimodal particle size distribution near-spherical powder and a high-performance low-cost TA15 part. The 3D printing method uses a bimodal particle size distribution near-spherical TA15 alloy powder with good uniformity as a raw material, improves the near-spherical powder bed density through bimodal grading of coarse powder and fine powder, and then prepares a low-cost high-performance TA15 part through an optimized selective laser melting (SLM) process parameter window suitable for bimodal distribution powder, thereby providing a more cost-effective preparation method for TA15 titanium alloy parts in aerospace.

The application discloses a production process of electroplating grade potassium pyrophosphate, which uses potassium carbonate and diaphosphorus pentoxide as raw materials, and adds a catalyst to react in a high-pressure reaction kettle. After the reaction is completed, water is added for dissolution, and the pH value of the slurry is controlled to be 9.0-10.0. After being filtered through a precision filter, the slurry is punched into a slurry storage tank, and the slurry storage tank is maintained at 75-95 DEG C. The slurry in the storage tank is punched into an evaporation and concentration device for concentration, and then the concentrated liquid is punched into a continuous crystallization device for continuous crystallization operation. After centrifugal treatment, the filtrate is recycled into the evaporation and concentration device. The potassium pyrophosphate crystals are subjected to vacuum drying treatment in a vacuum drying equipment, and then are packaged into finished products after being crushed and sieved. The potassium pyrophosphate crystals obtained by the application have high purity, less caking phenomenon, and stable and controllable product quality.

The invention discloses a temperature control method for processing graphite by using double plasma sources, and relates to the technical field of plasma material processing, in particular to a temperature control method for processing graphite by using double plasma sources, which comprises the following steps: adopting a cylindrical reactor, and arranging a plasma source I and a plasma source II up and down along the axial direction on two sides of the cylindrical reactor, and an outlet of the powder feeding mechanism directly faces a core high-temperature area of the plasma source I, so that graphite powder directly enters a heating area. The two sources are connected in series up and down to construct a continuous relay type high-temperature path. The center distance between the powder feeding port and the source I is limited not to exceed half of the outlet diameter of the reactor, the center distance between the two sources is 1-2.5 times of the outlet diameter, and the center distance between the source II and the outlet is larger than 5 times of the diameter; the flow of the second source is 1.2-1.8 times that of the first source, the temperature of the core area is maintained to be 8000-10000 K by adjusting the flow ratio, and the total power does not exceed 100 kilowatts. The total retention time of the graphite powder in a two-source high-temperature area is longer than 0.2 second, the diameter of an outlet of the reactor is 100-400 mm, the reactor is made of high-temperature-resistant stainless steel or graphite, and accurate control over the graphite treatment temperature is achieved.

This invention discloses a method for the biological drying of sludge, comprising the following steps: baking biomass materials, mixing the resulting baked product with sludge, biochar materials, and a conditioner for biological drying, thereby completing the sludge drying process. In this invention, by biologically drying the mixture of baked product, sludge, biochar materials, and conditioner, not only can the self-generated heat within the system be used to effectively dewater the sludge in a very short time, but the bioavailability of the microbial carbon source can also be improved, effectively reducing the generation of polluting gases. This method can effectively reduce the emission of polluting gases while achieving rapid dewatering. It has advantages such as simple process, low treatment cost, low energy consumption, high drying efficiency, good dewatering effect, low polluting gas production, and low content of toxic and harmful components in the dried product. It can solve the problems of biomass resource waste and pollution, achieve sludge reduction and resource utilization, and has high returns and good application prospects.

The application relates to the technical field of admixtures for building materials, in particular to a special polycarboxylic water reducing agent for gypsum boards, which comprises the following steps: S1, preparing a multifunctional monomer mixed solution; S2, preparing an initiation system: dissolving polyether macromonomer and a chain transfer agent in part of water, placing the water in a reactor, heating to a preset temperature and keeping constant; S3, performing a gradient copolymerization reaction: under the constant temperature condition, synchronously and slowly adding the multifunctional monomer mixed solution and an oxidant aqueous solution into the initiation system; S4, performing aging and post-treatment: after the addition is completed, keeping constant temperature aging at the preset temperature, then reducing the temperature, and neutralizing with lye until the pH value is 6-7, so that the special polycarboxylic water reducing agent is obtained. The whole process does not need toxic and harmful raw materials such as formaldehyde and naphthalene, and conforms to the green chemistry direction. The problems of demolding difficulty and production line congestion caused by retardation are solved, and the mold turnover rate and the production line efficiency are significantly improved. Under a higher water reducing rate, lower porosity (non-bubble pore) and higher compactness can be obtained.

This invention discloses the contents of a Tibetan Artemisia capillaris capsule, which is prepared from the following raw and excipient materials in weight percentages: 55%–59% filler, 3%–6% flow aid, and the remainder being Tibetan Artemisia capillaris extract; the Tibetan Artemisia capillaris extract is an alcoholic extract of Tibetan Artemisia capillaris. The Tibetan Artemisia capillaris granules of this invention not only meet the quality requirements of the pharmacopoeia but also have low cost, making them suitable for large-scale industrial production.

The invention discloses an organic fertilizer composition taking fermented sludge as a matrix. The organic fertilizer composition is prepared from a sludge matrix, a structural auxiliary material and a functional biological agent, wherein the weight ratio of each component is as follows: 45-100 parts of the decomposed sludge, 15-50 parts of the structural auxiliary material and 0.1-2.0 parts of the functional biological agent; the water content of the sludge matrix is lower than 30%, the sludge matrix is sludge subjected to harmless fermentation treatment, and the functional biological agent comprises nitrogen fixation, phosphate solubilizing, potassium solubilizing and microbial flora; the structural auxiliary material is a mixture of agricultural organic waste and an inorganic mineral conditioner. Compared with the prior art, the organic fertilizer composition with the fermented sludge as the matrix and the processing technology of the organic fertilizer composition have the advantages that the harmless degree is high, the physical property is excellent, functional viable bacteria are rich, and efficient resource utilization of the sludge is achieved.

The present application relates to copper-chromium contact preparation technical field, specifically to a kind of copper-chromium contact material rapid hot-pressing sintering forming process, preparation method includes: S1, ball milling powder mixing, S2, mould pressing, S3, pad nest, S4, loading hot-pressing, S5, electrodeposition treatment;The present application can improve the bulk density of mixed powder by ball milling raw materials, which plays a polishing role on the sharp corners of metal powder particles, avoids the "bridge" phenomenon in the micro area during mould pressing process, and forms internal closed pores;Vacuum firing treated graphite paper is laid along the inner wall of graphite mould for hot-pressing sintering, which facilitates subsequent demoulding;The holding temperature is controlled at 900~980℃, to avoid copper powder melting and liquid penetration due to excessive temperature;The present application carries out electrodeposition treatment on copper-chromium contact material, which can make copper-chromium contact show better resistance to welding and heat resistance.

The utility model belongs to refractory material technical field, concretely relates to a novel white corundum clinker kiln car heat preservation system, including tunnel kiln and the square corundum brick layer, corundum castable layer, hollow ball castable layer and high alumina fibre blanket that set up on the kiln car, the high alumina fibre module is uniformly distributed in the kiln car top edge and tunnel kiln inner wall, work, the white corundum clinker that will be removed from the receiving car is placed on the kiln car, through the kiln car with white corundum clinker is transferred to tunnel kiln and is kept warm for a certain time, delays the heat loss of white corundum clinker, prolongs white corundum clinker cooling crystallization process, improves the bulk density of clinker, reduces the impurity content of white corundum, increases the content of alumina content, improves the use performance of white corundum in refractory products.

The invention provides a silicon-carbon composite material as well as an appearance evaluation standard and application thereof, and relates to the technical field of battery negative electrode materials. The silicon-carbon composite material comprises sphere-like silicon-carbon particles, and each sphere-like silicon-carbon particle comprises a silicon-carbon plane and a silicon-carbon transition cambered surface adjacent to the silicon-carbon plane; and the minimum value of the curvature of the cambered surface infinitesimal element of the silicon-carbon transition cambered surface at the joint of the silicon-carbon transition cambered surface and the silicon-carbon plane is 0. The material is of a sphere-like structure containing a plane and an adjacent transition cambered surface, the structure and a base body can form three-dimensional interlocking, mechanical binding force is enhanced, interface crack propagation is restrained, particles can be promoted to be directionally arranged to form regular and uniform slit-shaped channels / pores, the compression resistance and abrasion resistance of the material are improved, the stacking density is increased, and the contact area is increased. And the silicon-carbon composite material has excellent electrochemical performance. The shape evaluation standard represented by the polyhedron degree Q (0-1, the closer to 1, the closer to an ideal polyhedron) is provided, the problem that the shape of an existing polyhedral material lacks a unified evaluation standard is solved, a scheme is provided for similar polyhedral material evaluation, and material design, screening and application are promoted.

The invention provides an olefin polymerization catalyst as well as a preparation method and application thereof. The catalyst comprises titanium halide, magnesium halide and a diether electron donor compound; the magnesium halide is a reaction product of titanium halide and an olefin polymerization catalyst carrier comprising a composition shown as a formula (I), and in the formula (I), R1 is selected from C1-C14 alkyl or C3-C14 cycloalkyl; r2 and R3 are the same or different, and are respectively and independently selected from H, C1-C5 alkyl or C1-C5 halogenated alkyl; x is selected from halogen; m is 0.1-1.9, n is 0.1-1.9, and m + n = 2; c1 is selected from aminophenol compounds, 0 lt; q < = 0.5. When the olefin polymerization catalyst provided by the invention is used for olefin polymerization, the particle fluidity of the catalyst is obviously improved, the catalyst has good catalytic activity and good hydrogen regulation sensitivity, and a prepared polymer product has relatively high bulk density, wider molecular weight distribution and shorter falling time.

This invention relates to the field of sodium-ion battery technology, specifically disclosing a sodium iron pyrophosphate (NFPP) cathode material, its preparation method, and its application. The preparation method includes: using iron phosphate as the iron source, mixing it with a specific sodium source, phosphorus source, and composite carbon source; adjusting with deionized water; and then performing precision sand milling to control the slurry particle size D50 within 0.30~0.35 μm to ensure uniform elemental mixing; subsequently, spray drying is performed to obtain a precursor with high sphericity and narrow particle size distribution; finally, programmed sintering is carried out under an inert atmosphere to obtain the final product. This invention solves the problems of uneven elemental distribution, impurity phase formation, low material compaction density, and poor electrochemical performance in existing technologies through synergistic optimization of the entire process chain of sand milling-spray drying-sintering. The obtained NFPP material has a high-purity phase structure. The sodium iron pyrophosphate cathode material prepared by the method of this invention can achieve a 0.1C discharge specific capacity of 101 mA·hg. ‑1 The 1C discharge specific capacity can reach 93 mA·hg ‑1 It is suitable for the preparation of high-performance sodium-ion batteries.

This invention belongs to the field of new energy fuel cell technology, and specifically relates to an anode catalyst with anti-reverse polarity, its preparation method, slurry, and fuel cell. The catalyst includes a support and a Pt-Ru alloy and IrO2 supported on the support, wherein the support is a carbon material support; the particle size of the anti-reverse polarity anode catalyst is 3-5 nm. Addressing the technical deficiencies of existing anti-reverse polarity anode catalysts, this invention proposes an improved anti-reverse polarity anode catalyst. This catalyst uses a carbon material support with superior conductivity and mass transfer capacity compared to metal oxide supports such as TiO2, ZrO2, WO3-Mn, and Nb-TiO2. IrO2, which has high anti-reverse polarity performance, is co-supported with the metal active component Pt-Ru alloy on the carbon material support. The resulting anti-reverse polarity anode catalyst, when applied to a fuel cell, exhibits a reverse polarity time of 171 min and an electrode performance of 1.40 A / cm² after reverse polarity. 2 In addition, this anode catalyst also exhibits excellent resistance to CO poisoning.

Under the load of 2.16 kg and at the temperature of 190 DEG C, the melt index is 600-2500 g / 10 min, the molecular mass distribution is 1.2-1.8, the melting point is 90-135 DEG C, the crystallinity is 50-90%, the true density is 0.930-0.970 g / cm < 3 >, the branching degree is 0-1.0 mol%, the bulk density is 0.30-0.55 g / cm < 3 >, and the average particle size is 200-1000 mm. An alkane solvent with the boiling point being 5-55 DEG C or a mixed alkane solvent with the saturated vapor pressure being 20-150 KPa at the temperature of 20 DEG C is used as a polymerization solvent, a single-active-center catalyst is used as a main catalyst, aluminoxane, modified aluminoxane, alkyl aluminum or halogenated alkyl aluminum is used as a cocatalyst, the polymerization temperature is 70-100 DEG C, the temperature difference in a kettle is smaller than 2.0 DEG C, the polymerization pressure is 1.0-4.2 MPa, and the reaction time is 1-2 hours. A process for the preparation of a reactor slurry polymerization of a feedstock comprising ethylene, hydrogen, and / or a comonomer. The preparation method is simple and easy to control, and the obtained powdery polyethylene is high in melt index, adjustable and controllable in average particle size, true density, melting point, crystallinity and the like, and narrow in particle size distribution.

This invention provides a (Hf,Zr,Ta,Ti)B2-SiC ceramic powder and its preparation method, belonging to the field of high-entropy boride ceramics technology. This invention uses excess B4C powder to ensure more complete reaction of the metal oxide powder, forming a single-phase (Hf,Zr,Ta,Ti)B2 ceramic powder without impurity formation. Using SiC powder as a filler phase further improves both the density and bulk density of the (Hf,Zr,Ta,Ti)B2-SiC ceramic powder. Spray granulation further enhances the flowability of the (Hf,Zr,Ta,Ti)B2-SiC ceramic powder, ensuring that the resulting (Hf,Zr,Ta,Ti)B2-SiC ceramic powder, when coated using plasma spraying technology, achieves a high density of the (Hf,Zr,Ta,Ti)B2-SiC ceramic coating.

The application provides a method for preparing lithium iron phosphate from iron hydroxyl phosphate and ferrous oxalate. The ferrous sulfate is purified to form a ferrous sulfate solution. Hydrogen peroxide, phosphoric acid, ammonium dihydrogen phosphate solution and ammonia water are sequentially added to the solution to form a mixed slurry. The mixed slurry is heated and kept warm, and then washed with water and filtered under pressure to form an iron hydroxyl phosphate precursor with different iron and phosphorus ratios. The iron hydroxyl phosphate precursor is dried by flash evaporation and sintered at high temperature and then crushed to obtain an iron hydroxyl phosphate precursor with different iron and phosphorus ratios and different specific surface areas. The iron hydroxyl phosphate precursor is crushed and mixed to obtain an iron hydroxyl phosphate product. The high-iron and low-iron ratio iron hydroxyl phosphate is mixed with ferrous oxalate, lithium phosphate, lithium carbonate and ammonium dihydrogen phosphate in a certain proportion, and a carbon source and an additive are added to form a mixture. The mixture is subjected to a series of processes such as ball milling, sand milling, spray drying, sintering, crushing, screening, batching and packaging to obtain a lithium iron phosphate product.

The invention discloses a catalyst carrier for olefin polymerization, which is obtained by contact reaction of metal magnesium powder, mixed alcohol, an initiator and an aluminum-containing compound, and the molar ratio of the mixed alcohol to the metal magnesium powder is 2-40; the molar ratio of the initiator to the metal magnesium powder is 0.001-2, and the molar ratio of the aluminum-containing compound to the metal magnesium powder is 0.01-0.1; in percentage by weight, the content of halogenated alkoxy in the catalyst carrier for olefin polymerization is 0.5-30%, and the content of aluminum element is 0.001-10%. The invention also discloses a preparation method of the catalyst carrier for olefin polymerization. The catalyst carrier for olefin polymerization provided by the invention has excellent form and larger specific surface area, and the internal structure of generated alkoxy magnesium particles is more compact, so that the formed carrier particles are not easy to break, the bulk density of a polymer is improved, and the requirement of high activity of a catalyst loaded by the alkoxy magnesium carrier is met.

The application discloses a doped modified lead metaniobate-based high-temperature piezoelectric ceramic and a preparation method thereof. The doped modified lead metaniobate-based high-temperature piezoelectric ceramic has a general formula of PbNb2O6+x mol% Nb2O5+y wt% Sc2O3+z wt% SrCO3+delta mol% Ta2O5; wherein x=0-8, y=0-0.8, z=0-1, and delta=0-12. The application solves the problems of sintering difficulty, low density and low piezoelectric coefficient of pure PbNb2O6 by adding excess Nb2O5; on the basis, Sc 3+ , Sr 2+ , and Ta 5+ ions are doped in sequence, so that the piezoelectric performance of the PbNb2O6-based piezoelectric ceramic is continuously improved while the high Curie temperature is ensured.

Provided is a curable composition that can, when cured, form a cured product having adhesiveness and adhesion to an adherend at excellent levels. The curable composition contains a polyorganosilsesquioxane and one of (A) a compound represented by Formula (X); and (B) a polymerization stabilizer, where Formula (X) is expressed as follows: wherein r1 represents an integer from 4 to 20; L represents a group containing epoxy, oxetanyl or vinyl ether group; R11 and R12 each represent an optionally substituted hydrocarbon group; s1 represents an integer from 1 to 3; t1 represents an integer from 0 to 2, where s1 plus t1 equals 3; and R13 and R14 are selected from hydrogen and an optionally substituted hydrocarbon group. The polyorganosilsesquioxane has a number-average molecular weight of 1000 to 3000 and a molecular-weight dispersity of 1.0 to 3.0, includes a constitutional unit represented by Formula (1), has a ratio of a constitutional unit represented by Formula (I) to a constitutional unit represented by Formula (II) of 5 or more, and has a total proportion of the constitutional unit

The application discloses a preparation method and application of low-carbon magnesite-carbon brick, relates to the technical field of low-carbon magnesite-carbon brick preparation, and comprises the following component materials: 69-73 parts of fused magnesite, 3-7 parts of zirconia, 3.5-7.5 parts of graphite powder, 2.8-3.4 parts of phenolic resin, 2.5-4 parts of a functional additive and 1-2 parts of nanometer materials; the nanometer materials can be added to enhance the strength and toughness of the matrix, can also fill the pores of the fused magnesite and the zirconia, realize the close packing of particles, and reduce the apparent porosity of the material; the zirconia can be added to provide a solid, stable and non-shrinking skeleton support for the brick body, and guarantee the high-temperature stability; the functional additive can be added to optimize the phase composition under high temperature, enhance the thermal shock resistance and wear resistance of the brick body, and ensure that the low-carbon magnesite-carbon brick can still maintain good structural integrity and use reliability under high temperature and complex working conditions.

The application discloses a kind of sodium iron silicate negative materials and preparation method thereof.The method uses phosphating by-product silicon slag as silicon source, uses iron salt and sodium salt as raw material, uses template agent and solvent as auxiliary, and obtains the irregular spherical particle sodium iron silicate negative material by sol-gel method combined with stepwise heating calcination process.The application realizes high-value utilization of phosphating solid waste, and the prepared material has stable structure and exhibits high reversible capacity and excellent cycle stability when used as sodium-ion battery negative material.The method is simple, green and environmentally friendly, and low in cost, suitable for industrial production.

The present application relates to the technical field of preparation of tritium breeder, in particular to a method for batch preparation of Li2TiO3 tritium breeding microspheres and rich phase structure by centrifugal granulation, comprising the following steps: S1, Li2TiO3 ceramic powder is pretreated by spray granulation, then sprayed with a solution of xanthan gum for granulation, and sieved to obtain a green body; S2, the green body is added into a centrifugal granulator, and a second binder solution is sprayed at the same time, so that Li2TiO3 microsphere seeds with a preset diameter are generated by centrifugal granulation; S3, then the second binder solution is sprayed while lithium-containing ceramic powder is added for granulation and bonding; S4, the process of S3 is repeated until ceramic microsphere green bodies with the required diameter are obtained; S5, then deionized water is sprayed in the granulator and continues to roll for 3-8 min; S6, the ceramic microspheres obtained in S5 are dried at constant temperature and humidity, degummed, and sintered. The method can realize batch preparation of high-lithium-content tritium breeding microspheres with single-phase structure or multi-phase structure.

The present application relates to the technical field of biomass thermo-chemical conversion and carbon removal, and particularly relates to a continuous pyrolysis biochar production sealing system and method, which comprises a feeding assembly, a pyrolysis main furnace and a discharging assembly; a feeding screw in the feeding assembly is provided with a variable-pitch compression structure to form a mechanical bolt seal section in a feeding cylinder; a discharging cylinder in the discharging assembly is upwardly inclined and cooperates with a discharging screw to form a granular carbon seal section in the discharging cylinder; the sum of effective lengths of the mechanical bolt seal section and the granular carbon seal section is not less than an effective stroke length of an internal reaction zone of the pyrolysis main furnace; the discharging assembly can further comprise a jacketed cylinder structure, a hollow screw shaft, a cooling liquid conveying device and a rotary joint to continuously cool the high-temperature biochar. The present application can improve the sealing capacity and operation stability of the pyrolysis main furnace on both sides under the continuous pyrolysis working condition.

This invention provides a method for preparing high bulk density potassium peroxymonosulfate composite salt. Through multi-dimensional process optimization including multi-point feeding and neutralization, ultrasonic action, crystal guiding agent, heating-heating-heating-cooling, and drying-mixing-sieving, the bulk density of PMS is synergistically improved, and the overall performance of the final product is superior to that of the prior art.

This invention discloses a method for purifying 2,5-furandicarboxylic acid (FDCA), belonging to the field of chemical technology. The purification method includes the following steps: crude 2,5-furandicarboxylic acid is subjected to alkali dissolution, oxidation, acidification, stirring, pulping, washing, and drying to obtain pure 2,5-furandicarboxylic acid. In the acidification crystallization process and the pulping and washing process, by selecting appropriate conditions such as the acidification reaction temperature, the oxygen content of the oxidation gas, the pulping and washing temperature, and the pulping and washing time, the purity of the obtained FDCA can reach 99.99%. Moreover, no organic solvents are used, meeting the requirements of polymerization-grade products. Furthermore, and more importantly, the FDCA product obtained by this invention has excellent particle characteristics, high flowability, and high bulk density, which is highly beneficial for downstream polymerization reactions and also facilitates the packaging and transportation of the FDCA product.

The application discloses PET matte master batches, a preparation method and application thereof, and belongs to the field of functional material modification. Barium sulfate is used as an extinction agent, the volume density of the barium sulfate is large, the barium sulfate can be well mixed with resin, the problem of layered mixing is solved, the color of the barium sulfate itself is white, and the color of the master batch is not affected. Moreover, the barium sulfate is compounded with organic modified layered silicate to produce a synergistic effect, the light transmittance is effectively improved, a high light transmittance, high haze and high gloss film product is successfully prepared, and the film product can be applied to high-end industries.