52results about How to "Short melting range" patented technology

The invention relates to a method for refining a thiofide 2-mercaptobenzothiazole (M). The method is characterized in that an extraction method and an alkali dissolving and acid isolation method are creatively combined. The method comprises the following steps: crude thiofide M is extracted by using toluene for three times to remove resin impurities so as to obtain high-purity thiofide M; the thiofide M in the resin is purified by the alkali dissolving and acid isolation method; and the thiofideoluene is reclaimed by a distillation method. By adopting the processing, the thiofide M with high purity, high melting point and short melting period can be obtained.

The invention relates to a method for synthesizing dianhydride monomer, especially a method for synthesizing aryl diether dianhydride by condensation, hydrolysis, acidification, and dehydration. In the invention, catalyst is added in the process of condensation for improving the yield of product; the solid content is 10-20%, reaction temperature is 7-100C., and reaction time is 15-48 hours; and the solvent consumption is reduced for reducing the impurity in condensed product. And diether tetracid in the diether dianhydride treated by dehydration is removed by dehydration in toluene or acetic acid and acetic anhydride and high temperature dehydration in vacuum oven sequentially, and the targeted product processed by said method has melting range less than 1C. and high purity.

The invention discloses a method for directly extracting and purifying rubber vulcanization accelerator MBT granules by methylbenzene. The method comprises the following steps: heating 10-500g of rough MBT (impurities are mainly resin and intermediate products) the mass percentage of which is 40-70 percent to be at 200-250 DEG C, and than leading into a reactor with 100-2000ml of 20-50 DEG C distilled water, quickly cooling the MBT to 30-80 DEG C, discharging water out of the reactor and drying the obtained MBT granules; adding 1000-8000ml of methylbenzene in the reactor, heating to 40-60 DEG C, extracting for 50-200min at the stirring rate of 50-150 turns/min, filtering, drying and obtaining vulcanization accelerator MBT with content higher than 96 percent. The invention has the advantages that the method has simple process and easy industrialization and the obtained MBT has high purity and melting point and short melting range.

The invention provides a purification method of a rubber vulcanization accelerator MBT (2-mercaptobenzthiazole), which comprises the following steps: pulverizing a crude product MBT synthesized under high pressure, and putting the pulverized MBT in a high-pressure kettle, wherein the mass percent of MBT in the crude product MBT is 80-90%; sealing the high-pressure kettle, vacuumizing, and charging a nitrogen protective atmosphere; pressing carbon bisulfide which is 2-5 times by weight of the crude product MBT into the reaction kettle; after sealing, starting stirring, heating to 120-180 DEG C, and keeping the temperature for 0.5-2 hours; cooling the reaction kettle to room temperature at the rate of 0.5-3 DEG C/min in a jacket cooling mode, filtering, washing, and drying to obtain the vulcanization accelerator MBT of which the content is higher than 98%; and distilling to recover the filtered mother liquor which can be circularly used in the reaction stage, wherein the recovery rate is up to higher than 96%. The method has the advantage of simple process, and the purity of the prepared high-content MBT is up to higher than 98%; no waste water is generated in the refinement process; and the extractant carbon bisulfide used as the reaction raw material has the advantage of low energy consumption for recovery, and can be returned to the reaction stage for circular use.

The invention belongs to the technical field of powder paint, particularly relates to a compound curing agent used for polyester-type powder paint, and further discloses a production method and application of the compound curing agent used for the polyester-type powder paint. The compound curing agent used for the polyester-type powder paint is mainly produced by using trimesic acid,tris(2,3-epoxypropy)ester and diglycidyl terephthalate as main raw materials and selectively adding 1,2,4-benzenetricarboxylic acid,tris(2,3-epoxypropy)ester, hydroxy polyester resin, bicyclopentadiene dioxide and/or crystalline epoxy resin for mixing reaction. The compound curing agent used for the polyester-type powder paint has a good curing effect, the mechanical performance of a produced coating is stable,and meanwhile, the coating has good boiling-resistant performance; and when the compound curing agent used for the polyester-type powder paint and polyester resin are cured, the performance of a product of the compound curing agent used for the polyester-type powder paint and the polyester resin totally reaches curing effects of current TGIC and HAA curing agents, and the compound curing agent used for the polyester-type powder paint and an existing TGIC or HAA product can be mixed for use, so that the comprehensive performance is more excellent.

The invention discloses SnBiZn series low-temperature lead-free solder and a preparation method thereof and belongs to the technical field of low-temperature soft solder. The lead-free solder is composed of, by weight, 45.5-56.2% of Bi, 1.7-2.4% of Zn, and the balance Sn, wherein the weight percentage of Bi and Zn meets the relational expression b=0.0123a<2>-1.27a+34.652+c, a is the weight percentage of Bi, b is the weight percentage of Zn, and the value range of c is -0.2<=c<=0.2. The invention further discloses the preparation method of the lead-free solder. Solder alloy is eutectic or near-eutectic structures, the melting point is low, and the SnBiZn series low-temperature lead-free solder has excellent mechanical properties and solder joint reliability and is suitable for the field of low-temperature of soft solder.

The invention provides a 2-(3-amino-2-oxoindolin-3-yl)-3-hydroxyl-1,4-naphthoquinone derivative and a preparation method thereof, and belongs to the technical field of compound synthesis. The preparation method comprises the following steps: dissolving isatin derivative as shown in the formula (I), 2-hydroxyl-1,4-naphthoquinone as shown in the formula (II) and an ammonia source as shown in the formula (III) in a solvent; sufficiently stirring to react under a reflux state; tracking by TLC (thin layer chromatography) until the raw materials are completely reacted; cooling, performing suction filtering, and baking to obtain the target product. The preparation method has the advantages of mild reacting condition, simple operation, convenience in post-treatment and high yield which is over 98 percent at most and the melting range of the prepared product is short; the structures of corresponding compounds are certified by IR (infrared radiation), 1HNMR (1H nuclear magnetic resonance), 12CNMR (12C nuclear magnetic resonance) and ESI-MS (electrospray ionization mass spectrometry), and monocrystal can be cultured by a part of target products.

The invention belongs to the technical field of preparation of polyester powder coatings, and particularly relates to a long-acting weather-resistant chlorine salt corrosion-resistant polyester powdercoating and a preparation method thereof. The powder coating comprises the following main raw materials in parts by weight: 530-560 parts of polyester resin, 45-60 parts of TGIC, 10-15 parts of triglycidyl trimellitate, 120-180 parts of titanium dioxide, 80-120 parts of barium sulfate, 8-12 parts of a brightening agent and 7-10 parts of leveling agent. The polyester resin used in the powder coating is good in linear structure, and excellent flowing performance is guaranteed; more trifunctional curing agents TGIC are used in the powder coating and matched with triglycidyl trimellitate with a low melting point and excellent water resistance to jointly serve as a low-temperature curing agent, the crosslinking density and water resistance of a coating film are further improved, and finally long-acting weather resistance and chlorine salt corrosion resistance are guaranteed. The final powder coating product can be used for low-temperature curing at 160 DEG C, and the prepared coating filmhas excellent long-acting weather resistance and chlorine salt corrosion resistance, and is especially suitable for infrastructure spraying of expressways, such as guardrails and bridges.

The invention discloses a preparation method of a fluorine layer-containing polyimide composite material and equipment for the method. The preparation method comprises the following steps: a polyimide thin film subjected to surface treatment passes through devices such as an unreeling system, a correcting device, and a corona treatment device, and passes through an extruding pouring system filled with a fluorine-containing material at a speed of 0.5-100m, and the fluorine-containing material is compounded to the polyimide thin film; and the polyimide thin film compounded by the fluorine-containing material enters a main molding system to further control the thickness of the fluorine-containing material and the fluorine-containing material is sintered on the surface of the polyimide thin film, so that the fluorine layer-containing polyimide thin film is prepared. According to the preparation method disclosed by the invention, multilayer compounding and single/double-sided compounding are realized, and composite materials with different thicknesses of fluorine layers can be prepared, the process is concise, and the precision and the efficiency are high.

The invention provides a hindered amine light stabilizer intermediate and a preparation method of a hindered amine light stabilizer. The hindered amine light stabilizer intermediate is 2-chloro-4,6-di(N-butyl-N-1,2,2,6,6-pentamethyl-4-piperidyl amino)-1,3,5-triazine, and the preparation method comprises the following steps: in the presence of hydrogen, carrying out hydrogenation substitution reaction on 1,2,2,6,6-pentamethyl-4-piperidone and n-butyl amine, carrying out substitution reaction on the obtained intermediate 1 and cyanuric chloride to obtain 2-chloro-4,6-di(N-butyl-N-1,2,2,6,6-pentamethyl-4-piperidyl amino)-1,3,5-triazine. Formaldehyde or formic acid does not need to be adopted in the preparation process, the method has the advantages of being small in environmental pollution and equipment corrosion, and after the method is used for reaction preparation of the hindered amine light stabilizer, the target product is high in purity, good in color and luster and short in meltingrange.

The invention discloses a modified PA11 material. The modified PA11 material comprises a PA11 resin, a filling agent, an antioxidant and a lubricating agent, wherein the PA11 resin is filled with nanometer minerals; the mechanical performance and the heat resistance of the PA11 material are outstanding while outstanding chemical resistance remains based on the small size effect of the nanometer minerals and the boundary adhering, in addition, the PA11 materials is resistant to blasting under high and low temperature, so that the PA11 material is applicable to high and low temperature environments. The invention further discloses a pipe and a preparation method thereof. The pipe is prepared from the modified PA11 material. The prepared pipe is outstanding in 65# cooling liquid resistance and is applicable to the high and low temperature environments.

The invention discloses a preparing method for a novel environment-friendly low-temperature alloy. The novel environment-friendly low-temperature alloy comprises elements including, by weight, 30-60 parts of tin, 18-32 parts of bismuth, 15-27 parts of antimony, 1.5-3.5 parts of copper, 0.8-1.7 parts of cobalt and 2.2-2.7 parts of manganese. The low-temperature alloy is good in ductility, the melting range is short, and the low-temperature alloy can be widely applicable to preparing of mother boards in various industries and is particularly used for manufacturing mother boards of copper pot artware or precision artware, the mother board manufacturing difficulty can be lowered, the manufacturing precision is improved, the manufacturing cost is low, and the preparing method is suitable for industrial production.

The invention belongs to the technical field of medicine synthesis processes, and particularly relates to a refining method of atorvastatin parent nucleus M4. The DCS reaction kettle system is adopted to adjust the pH value of the system, so that the target product M4 can be effectively prevented from being damaged under acid-base conditions, unknown impurities are reduced, and the refining qualification rate is increased. According to the method disclosed by the invention, inorganic salts such as potassium carbonate, potassium bicarbonate and potassium chloride in the atorvastatin mother nucleus M4 (namely a compound VI) crude product 1 synthesized by a convergence method can be removed in the pulping process, and a mixed solvent is utilized in the recrystallization process, so that impurities are effectively removed and reduced, and the refining yield is improved. The process disclosed by the invention is simple in post-treatment, large in productivity, and suitable for industrial production, and the obtained product is high in chemical purity, low in impurity content, high in melting point, short in melting range and good in stability, and the recovered solvent and the crystallization mother liquor can be recycled.