36results about How to "Control molar ratio" patented technology

The invention discloses a method for preparing semi-aromatic polyamide. The method adopts low temperature of 170 DEG C to 190 DEG C for dehydration firstly, and then adopts a method for temperature-raising and prepolymerization to prepare the semi-aromatic polyamide, thus avoiding the loss of diamine and being capable of accurately controlling the molar ratio of the dicarboxylic acids and the diamine, obtaining the polyamide with high intrinsic viscosity and improving the quality of semi-aromatic polyamide. By the prepolymerization reaction, the prepolymer which is measured in 96 percent of sulphuric acid with the temperature of 25 DEG C and has the intrinsic viscosity Eta of 0.06 to 0.3dl/g can be obtained. After viscosifying reaction, the intrinsic viscosity Eta of the semi-aromatic polyamide is 0.8 to 2.5 dl/g and the melting point of the semi-aromatic polyamide is 270 to 330 DEG C; the content of terminal carboxyl group is 15 to 80 mol/t; and the content of amino-terminated group is 15 to 80 mol/t.

The invention discloses a semi-aromatic polyamide and a preparation method thereof. The method of the invention uses the aromatic dicarboxylic acid and aliphatic diamine containing 4 to 14 carbon atoms as the raw materials in order to prepare the semi-aromatic polyamide and acquire a new structure of the semi-aromatic polyamide. The semi-aromatic polyamide is prepared by combining high purity semi-aromatic polyamide salt so the polyamine loss is avoided and the mole ratio of the dicarboxylic acid and the diamine can be accurately controlled so as to acquire the high viscosity semi-aromatic polyamide. The monomer is purified in the salifying process, so the melting point, the crystallinity and the mechanical property of the semi-aromatic polyamide are promoted. The pre-polymerized material which has a viscosity eta ranged from 0.06 to 0.3 dl/g tested in 96% sulfuric acid at 25 DEG C by performing the pre-polymerization reaction is acquired. After the tackifying reaction is performed, the viscosity eta of the semi-aromatic aromatic polyamide is ranged from 0.8 to 2.5 dl/g, the melting point of the semi-aromatic aromatic polyamide is ranged from 270 to 330 DEG C, the content of the end carboxyl is ranged from 15 to 80 mol/t and the content of the end amino is ranged from 15 to 80 mol/t.

The invention discloses a preparation method of columnar hexagonal potassium titanate, which belongs to the field of the chemical industry. The method comprises the steps of: a, uniformly mixing a -100 mesh titaniferous containing material and a potassium containing material according to a molar ratio of TiO2:K2O=4-7; b, placing the material mixed uniformly in the step a in an environment at 1100-1300 DEG C for sintering for 1-4 hours for adequate reaction of the material; and c, quickly cooling the sintered material in the step b, then adequately dissociating the cooled material by water at a constant temperature of 60-80 DEG C, and finally filtering and drying to obtain a columnar hexagonal potassium titanate product. The method provided by the invention is simple in process flow, easy to operate, low in cost and high in yield, and the prepared columnar hexagonal potassium titanate is large in draw ratio and high in purity, and is suitable for industrial production.

A preparation method of small-grain low-silica-content X zeolite includes mixing silicon-containing compound, sodium hydroxide, water and sulfuric acid solution or water soluble sulfate, stirring and adding aluminum-containing compound to obtain gel, adding the directing agent to the gel to obtain the mixture with the molar composition of (2.5-5.0)Na2O:Al2O3:(2.4-3.0) SiO2:(0.5-2.0)SO4<2->:(80-200)H2O, standing and crystallizing at 80-120 DEG C for 0.5-3.0 hours, water washing, filtering and drying. The obtained X zeolite has a crystal grain of 0.2-1.2 Mum, the molar ratio of silica/alumina is 2.07-2.3, and the crystallinity is more than 95%.

The invention relates to a star-shaped polyglutamic acid as well as injectable hydrogel and a preparation method thereof. According to the preparation method, firstly, polyamino beta-cyclodextrin is stereospecifically synthesized, secondly, a plurality of polymerization reaction initiation sites are introduced so as to initiate ring-opening polymerization of L-glutamate-N-carboxylic acid anhydride, and finally the L-glutamate-N-carboxylic acid anhydride subjected to ring-opening polymerization is modified to be used as a first component of hydrogel; meanwhile, modified polysaccharide polymer is used as a second component of the hydrogel, the two components are mixed according to a certain ratio, through chemical crosslinking of the Schiff base reaction, the star-polyglutamic acid hydrogel is obtained, and the gelation time is 7-300 s. The hydrogel is characterized by having an excellent apparent appearance, mechanical properties, biocompatibility and biodegradability; in addition, beta-cyclodextrin is used as a core of the star-shaped polyglutamic acid, so that additional stable crosslinking sites are provided, the improvement of the mechanical strength of the hydrogel is facilitated, and the loading and controlled release properties to hydrophobic drugs are improved. The hydrogel has a wide application prospect in the fields of drug controlled release, tissue engineering, regenerative medicine and the like.

The invention discloses general bonderite which is used before spray coating of a steel and aluminum combined shell body and by which phosphating films can be generated on the surfaces of steel and aluminum at the same time, and a preparation method of the general bonderite. The general bonderite is prepared by mixing a main agent, an additive No.1 and an additive No.2; the mass ratio of the main agent, the additive No.1 to the additive No.2 is 100:(3-8):(13-19); the main agent is prepared from the following raw materials in percentage by mass: 8 to 20 percent of phosphoric acid, 1 to 3 percent of room-temperature steel surface treatment agent, 0.5 to 2 percent of zinc oxide, 0.1 to 0.3 percent of 35 percent hydrogen peroxide, 0.6 to 2 percent of over 38 percent manganese carbonate, 2 to 4 percent of sodium carbonate, 4 to 7 percent of nickel nitrate of which Ni content is 20 percent, 0.1 to 0.2 percent of ferric nitrate and the balance of water; the additive No.1 is prepared from the following raw materials in percentage by mass: 40 to 70 percent of 40 percent silicofluoric acid, 3 to 5 percent of 50 percent hydrofluoric acid and the balance of water; and the additive No.2 is prepared from the following raw materials in percentage by mass: 30 to 70 percent of sodium nitrate and the balance of water.

The invention discloses a preparation method of palladium nano-clusters with the sizes being controllable. The method can be used for preparing the palladium nano-clusters of different sizes on a large scale. The method specifically comprises the steps that firstly, palladium chloride is dissolved into a trace amount of concentrated hydrochloric acid; secondly, an obtained mixture is added into anorganic solvent and stirred for a period of time; and thirdly, mercaptan ligands with different mole ratios are added for reaction, after one hour of reaction, sodium borohydride is added for reduction, and non-valent palladium nano particles are obtained. The sizes of the nano-clusters are controlled by changing the ratios of the ligands. The preparation method related by the invention is feasible and easy to operate, and the palladium nano particles of different sizes can be obtained by adjusting and controlling the ligands with the different mole ratios.

The invention discloses a synthesis process of a composite piperazine heavy metal chelating agent TDDP, which comprises the following steps: by using ethylenediamine and glyoxal as raw materials, carrying out a condensation reaction in the presence of a catalyst to generate dipiperazine; taking organic alkali tetramethyl guanidine as a catalyst, and reacting dipiperazine with carbon disulfide andsodium hydroxide to generate TDDP; and meanwhile, reacting ethylenediamine with carbon disulfide and sodium hydroxide to generate EDTC. Compared with the prior art, the beneficial effects of the invention are that: under a designed reaction condition, a solution obtained after dipiperazine is synthesized is used for preparing TDDP, excessive ethylenediamine reacts with carbon disulfide and sodiumhydroxide to generate another heavy metal precipitant EDTC; therefore, the prepared heavy metal chelating agent target product can obtain a removing agent with the function of removing heavy metal ions of a cyclic structure and a linear structure at the same time without secondary compounding, the application field is expanded, and the heavy metal ion removing effect is particularly obvious.

The invention relates to a method for directly producing 1,2-pentanediol through furfural hydrogenation. The method includes the step of conducting a hydrogenation reaction under certain reaction temperature and hydrogen pressure conditions with the presence of solvents with furfural as the raw material and amorphous alloy as the catalyst to generate 1,2-pentanediol through one step. The method has the advantages of being mild in catalytic reaction condition, low in catalyst preparing cost and simple in after-reaction catalyst separation; the problems are solved that in the existing process ofdirectly preparing 1,2-pentanediol through furfural hydrogenation, the preparing cost of noble metal catalysts is high, the reaction pressure of Cu-series catalysts is high, the requirements for devices and operation are high and existing catalysts are complicated to recover after reaction; the method has good industrial application prospects.

The invention provides a method for rapidly removing chloride ions in wastewater by using a bismuth-based metal organic framework material. According to the method, soluble bismuthate and non-toxic organic acid are utilized to form a porous bismuth-based metal organic framework material as a dechlorination reagent, the bismuth-based MOFs material is added into chlorine-containing wastewater, the pH value and stirring time of the wastewater are adjusted, the molar ratio of bismuth ions to chloride ions is controlled, and qualified filtrate with low-concentration chlorine content and a bismuth oxychloride product are obtained after filtration.

The invention provides a modified titanium dioxide photocatalysis material. The modified titanium dioxide photocatalysis material comprises titanium dioxide and doping elements, and the doping elements comprise Fe, Ce, B, Ni, V, Co, La and Nd; and a molar ratio of Fe to V is 0.01-10:1, and a molar ratio of Ce to Co is 0.1-10:1. The invention also provides a preparation method of the modified titanium dioxide photocatalysis material, a photocatalysis glass containing the modified titanium dioxide photocatalysis material, and a preparation method of the photocatalysis glass. The modified titanium dioxide photocatalysis material has a very good photocatalysis effect on formaldehyde, amines and toluene.

The invention relates to a method for directly producing 1,2,6-hexanetriol by performing hydrogenation on 5-hydroxymethylfurfural. The method comprises the following steps: adopting 5-hydroxymethylfurfural as a raw material under the existence of the solvent, taking amorphous alloy as catalyst, performing hydrogenation under a certain reaction temperature and hydrogen pressure condition, generating 1,2,6-hexanetriol through one-step method. The method disclosed by the invention has the advantages of being high in hexanetriol yield, mild in reaction condition, low in catalyst preparation cost and simple in separation after reaction, and has good industrial application prospect.

The invention relates to a novel preparation process of a synthetic fatting agent and a device, and aims at achieving the effects that according to the provided process, the sulfonation degree of a final product can be automatically controlled, and the provided device can realize the continuous production of products. The preparation process of the novel synthetic fatting agent has the technical scheme that the novel preparation process of the synthetic fatting agent is performed according to the following steps of (1) synthesizing an oleic acid glycol monoester and diester mixture; (2) measuring the density of an esterification product by an automatic control system; (3) continuously inputting an oleic acid glycol ester mixture into a sulfonator for taking a diaphragm type sulfonation reaction; and (4) obtaining a leather fatting agent product, wherein tail gas is absorbed by a tail gas treatment system. A novel production device of the synthetic fatting agent comprises an esterification reactor, an organic material pump, a back pressure valve, a sulfonation reactor and a gas-liquid separator, wherein the esterification reactor is provided with an oleic acid inlet and a glycol inlet; a measuring instrument is also arranged in a connecting pipeline arranged between the organic material pump and the back pressure valve; and a data converter is communicated with the measuring instrument and a raw material pump.

The invention provides an anti-fouling textile finishing method. The method includes steps: subjecting textiles to corona treatment; adding butyl titanate, oxalic acid and sodium dihydrogen phosphateinto an ethyl alcohol and water mixed solvent, performing hermetical heating reaction, cooling to the room temperature, soaking the treated textiles, adopting a twice-soaking twice-dewatering process,and drying; soaking the treated textiles into water-repellent oil-repellent finishing agent solution, adopting a twice-soaking twice-dewatering process, drying and baking. Compared with the prior art, the anti-fouling textile finishing method has advantages that great water and oil repelling effects are achieved, fouling is prevented, high firmness of a waterproof layer and high light degradation efficiency are realized, and the self-cleaning performance is improved; in addition, a preparation method is simple and low in cost.

The invention discloses a preparation method of an LATP solid electrolyte, and relates to the technical field of lithium ion secondary battery solid electrolyte preparation, the preparation method comprises the following steps: S1, adding TiOSO4 into deionized water, mixing to prepare a TiOSO4 aqueous solution, adjusting the pH value, and preparing the TiOSO4 aqueous solution with the adjusted pH value for later use; S2, adding NaF into deionized water to prepare a NaF aqueous solution for later use; S3, adding H3PO4 into deionized water to prepare an H3PO4 aqueous solution for later use; S4, adding deionized water, NaF and H2SO4 into a reaction kettle, preparing and heating a mixed bottom water solution, adding a TiOSO4 solution, a NaF solution and a H3PO4 solution into the mixed bottom water solution at the same time, conducting solid-liquid separation, washing and drying prepared solids, and preparing Ti3 (PO4) 3 solid powder; and S5, adding an AlPO4 solid and a Li3PO4 solid into the Ti3 (PO4) 3 solid powder, mixing, sintering, crushing and sieving to obtain the LATP solid electrolyte.