66results about How to "Guaranteed crystallinity" patented technology

The invention discloses a hydrocracking catalyst carrier and a preparation method thereof. The catalyst carrier comprises a modified Y-type molecular sieve, amorphous silica-alumina and alumina, wherein the modified Y-type molecular sieve is Y-type molecular sieve treated by mixed aqueous solution of an aluminum salt and an acid and by hydrothermal process. In the carrier, the modified Y-type molecular sieve has a high crystallinity, high silicon to aluminum ratio and proper total acidity and acid distribution and can form an acid component with the amorphous silica-alumina. Therefore, the carrier is particularly suitable for serving as a hydrocracking catalyst carrier to improve the activity of a hydrocracking catalyst and the selectivity of middle distillates.

The invention relates to ZSM-5 molecular sieve with small crystal grains and application thereof, mainly solving the technical problems that the silica-alumina molar ratio (SiO2/Al2O3) of ZSM-5 molecular sieves with small crystal grains is less than 200, and the traditional ZSM-5 molecular sieves have poor catalyst stability and short service life when used for reaction for preparing propylene from methanol in the prior art. The invention well solves the problems by the technical scheme that the ZSM-5 molecular sieve with small crystal grains, which has a crystal diameter less than 300 microns and a SiO2/Al2O3 molar ratio not less than 200, is used for reaction for preparing the propylene from the methanol. The invention can be used in industrial production for preparing the propylene from the methanol.

The invention relates to a method for preparing high-solid-content waterborne polyurethane. The method comprises the following steps of: (1) reacting sulfonate-containing sodium dimethyl isophthalate-5-sulfonate with excessive polylol for a while, and then, adding polyacid to react so as to synthesize hydroxyl-terminated polyester; and (2) using the synthesized waterborne polyester as a soft segment, using diisocyanate as a hard segment, adding water to disperse, and carrying out chain extension by using polyamine so as to obtain the high-solid-content waterborne polyurethane. According to the method, the dispersion is easy, a large amount of solvent is not required for being used, the cost is saved, the solvent removal is easy, and the solid content reaches over 50% while lower viscosity is kept, so that the constructability of adhesive liquid is improved, and the adhesive liquid is crystallizable and has better initial viscosity and better adhesive strength; and the used polyester is synthesized autonomously, the raw materials are all common, and the process is simple, so that the cost is saved, and the industrialization is facilitated.

The invention belongs to the technical field of biomass nanometer materials and discloses a nano-crystalline cellulose fiber high in carboxyl group content and preparation and application thereof. A preparation method comprises the steps of preheating fiber slurry for 0.5-1.5h with sodium periodate at the temperature of 50-60 DEG C; adding a sodium chlorite solution and acetum into the slurry to be reacted for 1-3h at the temperature of 30-50 DEG C, adding TEMPO, NaClO2 and NaClO, and performing microwave heating to the temperature of 55-65 DEG C to enable the mixture to be reacted for 1-3h; performing ultrasonic dispersion and freeze drying to obtain the nano-crystalline cellulose fiber high in carboxyl group content. According to the nano-crystalline cellulose fiber, hydroxyl at the positions of C2 and C3 of cellulose is oxidized into a formyl group which is oxidized into carboxyl by sodium chlorite, hydroxyl at the position of C6 is selectively oxidized into carboxyl through a TEMPO neutral oxidation system, and accordingly the total carboxyl group content of the fiber is greatly increased, and obtained products can be used for advanced treatment of waste water at the middle section of paper making.

The invention discloses a hydrocracking catalyst, which comprises modified Y/Beta double micro-porous molecular sieve, modified Y molecular sieve, modified Beta molecular sieve as well as other carrier material and hydrogenation active components. Wherein the total silica-alumina mass ratio of the modified Y/Beta double micro-porous molecular sieve is 20.0 to 50.0, the BET specific surface area is 420 m<2>/g to 650 m<2>/g, the pore volume is 0.30 ml/g to 0.38 ml/g, and the infrared acidity is 0.65 mmol/g to 1.2 mmol/g. The catalyst preparation method adopts an impregnation method, and the modified Y/Beta double micro-porous molecular sieve is modified and processed with a firstly making up silicon and then roasting method. The hydrocracking catalyst has a higher service performance when being used in the heavy distillate oil hydrocracking, and can be used in various types of hydrogenation cracking process.

The invention discloses a preparation method of a high activity hydrocracking catalyst, which takes Y/Beta double micro-porous molecular sieve, Y type molecular sieve, Beta molecular sieve and the like, as acidic cracking material and adopts an impregnation method to prepare. Wherein various involved molecular sieves are mixed for modified processing, and the processing method is the processes of gas-phase making up silicon, hydrothermal treatment, ammonium and salt exchanging, ammonium and salt decomposing through roasting and the like. The preparation method has the advantages that hydrocracking catalyst prepared by the method has a higher reactivity and middle distillate oil selectivity, and the preparation method can be used in the heavy distillate oil hydrocracking process.

The invention provides a novel production technology for producing sodium fluoride and white carbon black in a co-production mode by using fluorosilicic acid. The fluorosilicic acid, water glass (sodium silicate) and sodium carbonate are used as main raw materials to produce high-purity silicon dioxide and sodium fluoride in the co-production mode, waste sodium fluoride mother liquor for producing the sodium fluoride is repeatedly used, waste water processing pressure of white carbon black enterprises and sodium fluoride enterprises is greatly relieved, cost of the raw materials of the sodium fluoride and the white carbon black is greatly reduced, and the revenue of the odium fluoride enterprises and the white carbon black enterprises is greatly improved.

The invention discloses an insulated and heat-conductive polybutylene terephthalate/polycarbonate composite material and a preparation method thereof. The insulated and heat-conductive polybutylene terephthalate/polycarbonate composite material comprises the following components in parts by weight: 20-50 parts of polybutylene terephthalate, 10-30 parts of polycarbonate, 20-70 parts of a heat-conductive filler, 0-2 parts of a transesterification inhibitor, 0.5-2 parts of a silane coupling agent and 0-2 parts of a lubricating agent. The insulated and heat-conductive polybutylene terephthalate/polycarbonate composite material has good heat-conducting property and mechanical property and excellent insulating property and can be applied to such parts with heat dissipating and insulating requirements as LED heat dissipating lamp holders or shells of other electronic and electric products.

The invention provides a white carbon black production process for producing sodium fluoride and co-producing cryolite by using fluorosilicic acid. The production process is used for producing sodium fluoride and co-producing high-purity silicon dioxide and cryolite by using fluorosilicic acid, sodium carbonate decahydrate and aluminum hydroxide as main raw materials. The white carbon black production process provided by the invention can be used for reducing the cost of sodium fluoride and cryolite raw materials and further improving the benefits of sodium fluoride production enterprises.

The invention relates to a method for synthesizing a titanium silicalite molecular sieve TS-1 for catalytic hydrogen peroxide oxidation. The method comprises the following steps of (1) uniformly mixing a titanium source with a silicon source through stirring, so as to obtain clear liquid; (2) mixing an organic template agent with the first clear liquid, hydrolyzing through drastic stirring till clear liquid is formed again, warming to remove glycol so as to obtain second clear liquid, wherein the pH is 11-14; (3) slowly dripping an ammonia solution of ammonium fluoride into the second clear liquid, and stirring while dripping, and finally obtaining clear mother liquid with the same pH as the second clear liquid; (4) crystallizing the clear mother liquid for 12-36 hours at 130-190 DEG C under autogenous pressure, then separating, drying and burning so as to obtain solid powder TS-1 molecular sieve. Compared with the prior art, the method has specific process steps, reduces the particlesize of the crystal due to introduction of fluoride, and improves the catalysis performance.

The invention provides a process of producing sodium hydrogenfluoride by using fluosilicic acid. Sodium hydrogenfluoride is produced and high purity silicon dioxide is co-produced by taking fluosilicic acid, sodium carbonate and hydrogen fluoride as main raw materials. According to the process provided by the invention, the quality of the sodium hydrogenfluoride product can be improved, the cost of the raw material sodium hydrogenfluoride can be lowered and the benefit of the sodium hydrogenfluoride production enterprise can be enhanced.

The invention relates to a hydrothermal synthesis method of a 4A molecular sieve. The hydrothermal synthesis method is characterized in that a ratio of water to sodium is not more than 25, and mechanochemical treatment is carried out. The preparation method of the 4A molecular sieve improves the solid phase yield of the hydrothermal synthesized 4A molecular sieve, guarantees the phase purity of the 4A molecular sieve, reduces the amount of water and the emission of wastewater, and also reduces the device and personnel investment.

The invention belongs to the field of material preparation, and discloses a photoanode material based on a covalent organic framework as well as a preparation method and application of the photoanode material. The material comprises a cocatalyst, and thecovalent organic framework based on a triazine structure; the cocatalyst and the covalent organic framework based on the triazine structure are stacked layer by layer to form a two-dimensional layered structure, and preferably, the cocatalyst is MoS2. The covalent organic framework material based on the triazine structure has high crystallinity, high specific surface area and good chemical stability, can serve as an excellent heterogeneous photocatalyst due to the fact that the content of the N component is rich and the visible light absorption property is high; and in addition, the covalent organic framework material is combined with the cocatalyst, the cocatalyst and the covalent organic framework (TTZ-COF) based on the triazine structure are stacked layer by layer to form the two-dimensional layered structure; and the two-dimensional layered structure is used as the photoanode material, so that the light utilization rate of the photoanode material can be effectively improved, and the efficiency of photolysis of water is ensured.

The invention provides a high-fluidity and high-gloss polypropylene composition and a preparation method thereof. The high-fluidity and high-gloss polypropylene composition provided by the invention comprises block co-polypropylene, a nucleating agent, an antioxidant and an acid acceptor, wherein the block co-polypropylene contains ethylene propylene rubber. The high-fluidity and high-gloss polypropylene composition provided by the invention has high glossiness, high fluidity, rigidity and toughness, has the advantages of elegance and attractiveness of ABS, and can be used in the fields of household appliance shells, automobile ornaments and the like.

The invention relates to a preparation method of a moisture-curable polyurethane hot melt adhesive for textile compounding. The preparation method comprises the following steps: stirring and mixing apolyol mixture composed of 5.3-10 parts of phthalic anhydride polyester polyol, 5-13.1 parts of sebacic acid polyester polyol, 12.5-16.6 parts of adipic acid polyester polyol and 24.3-37.9 parts of polyether polyol with 0.03-0.05 part of antioxidant, and carrying out vacuum dehydration; (2) cooling to 75-95 DEG C, adding 14.3-22.7 parts of 4, 4 '-diphenylmethane diisocyanate and 0.3-0.5 part of acatalyst, and stirring for reaction under the conditions that the vacuum degree is less than or equal to 100Pa and the reaction temperature is 85-90 DEG C; (3) adding 0.3-0.5 part of a chain extender,and continuously reacting under the conditions that the vacuum degree is less than or equal to 100Pa and the temperature is 85-90 DEG C; and (4) discharging and sealing, and curing at normal temperature for at least one day to obtain the moisture-curable polyurethane hot melt adhesive for textile compounding.

The invention discloses a method for after-treating polylactic acid and molding products thereof, which comprises the following steps of: crystallizing the polylactic acid and the molding products thereof at the temperature of above glass transition temperature and below thermal decomposition temperature for the first time; and crystallizing the polylactic acid and the molding products thereof atthe temperature above the glass transition temperature and below the thermal decomposition temperature for the second time, wherein the second crystallization temperature is higher than the first crystallization temperature. The polylactic acid or the molding products are obtained by a special two-time crystallization process; and compared with the molding products prepared by the common crystallization method through a heat treatment process, the molding products prepared by the method have higher transparency and heat resistance so as to be widely applied to the fields of packing materials and the like.

The invention discloses COF/CS aerogel, a preparation method and application thereof. According to the COF/CS aerogel disclosed by the invention, the COF/CS aerogel comprises a COF nano particle and a chitosan aerogel network which are cross-linked together through 1, 3, 5-trialdehyde-2, 4, 6-phloroglucinol, and the COF nano particle is a TpPa-SO3H nano particle. The invention relates to application of COF/CS aerogel in treatment of wastewater containing sulfonamides. The prepared COF/CS aerogel is good in water stability and contains sulfonic acid groups with strong affinity with sulfamerazine (SMR), so that various sulfonamides in a water body can be removed, and the COF/CS aerogel has a good application prospect in the field of wastewater treatment.

The invention relates to the technical field of polyethylene resin, in particular to polyethylene resin for hollow products as well as a composition and a preparation method of the polyethylene resin. The weight-average molecular weight of the polyethylene resin for the hollow product is 180000-320000, the density is 0.950-0.970 g/cm < 3 >, the melt mass flow rate under the load of 21.6 kg is 8-18 g/10 min, the crystallinity is 65-90%, the ESCR is not less than 600 h, and the tensile strength is 24-28 MPa; according to the preparation method, under the action of a chromium-containing catalyst, ethylene is taken as a polymerization monomer, 1-butene is taken as a comonomer, and polymerization is carried out so as to obtain the product. According to the polyethylene resin for the hollow product, the content of short branched chains is increased, the environmental stress cracking resistance is greatly improved, and meanwhile, the density and rigidity of the material are guaranteed; the invention also provides a composition of the composition, which has high environmental stress cracking resistance and maintains high rigidity and toughness. The invention also provides a preparation method thereof.

The invention provides a synthesis method of a defective zeolite molecular sieve rich in hydroxyl nests. The synthesis method comprises the following steps: mixing an inorganic silicon source and an organic silicon source which serve as a mixed silicon source with an aluminum source and an OSDA template agent to obtain sol, and crystallizing; and filtering, drying and roasting the obtained solid to obtain the defective zeolite molecular sieve rich in hydroxyl nests. The organic silicon source is alkylsiloxane. Alkylsiloxane is introduced in the process of constructing a framework of the molecular sieve, part of Si-C bond connection is formed, then C is burnt out in the roasting process of the molecular sieve, so that a single T-site framework point defect of the molecular sieve is formed, the hydroxyl nests are formed, the point defect almost has no influence on the crystallinity of the material, and the integrity of the molecular sieve framework is maintained to a great extent; and in the synthesis process, the defect degree of the molecular sieve can be relatively accurately controlled by controlling the variety and content of alkylsiloxane, so that the defect type zeolite molecular sieve rich in hydroxyl nests is obtained.

The invention belongs to the technical field of chemical synthesis, and particularly relates to a single-component polyurethane hot melt adhesive for a synthetic leather surface as well as a preparation method and application of the single-component polyurethane hot melt adhesive. According to the hot melt adhesive for the synthetic leather surface, polyester polyol is added, the crystallinity ofthe adhesive in the later period is guaranteed, and the softness of the adhesive is guaranteed through the combined action of polyether polyol and isocyanate; the hard segment strength of the whole adhesive system is regulated and controlled through the addition amount of isocyanate. The hot melt adhesive has the characteristics of no toxicity, no pollution, low energy consumption, convenience inconstruction and environmental protection; and the synthetic leather surface is wear-resistant, scratch-resistant, acid-base-resistant, solvent-resistant and high in mechanical strength.