37results about How to "Simple production process and equipment" patented technology

The invention discloses an aliphatic superplasticizer and a preparation method thereof. According to the invention, a molecular structure with high water reducing rate and good slump retaining performance can be obtained mainly by performing condensation reaction on aldehyde and ketone under strong alkaline catalysis, performing sulfomethylation reaction on carbonylation alpha site and introducingsulfonyl, and controlling the optimal mixing proportion, and meanwhile, a cement activating agent is added in the later period so as to improve the performance of the concrete and improve the strength of the concrete, thus obtaining the novel superplasticizer with excellent performance. According to the preparation method disclosed by the invention, reaction is performed at a relatively low temperature, a heat source is not needed, production process equipment is simple, production is steady and quick, yield is high and investment is low; by using low-cost industrial byproduct, namely sodiumsulfite, material cost is lowered; and by adopting high-efficiency tail gas purifying and recycling method and device, emission without the three wastes is achieved, not only is environment improved,but also raw material consumption and production cost are lowered.

Disposable plaster tableware, including chopsticks, spoons, lunch boxes, cups, bowls, plates. It is mainly made of gypsum and water-soluble adhesives through tableware molding technology. It includes the following raw materials in percentage by weight: 60-97% of gypsum powder, 3-40% of water-soluble adhesive, and the water-soluble adhesive is selected from polyvinyl alcohol resin, starch, gelatin, modified polyethylene, organic silicon A combination of one or two or more binders. In addition, 25-40% of water accounting for the total weight of the gypsum powder and the water-soluble binder is added. Its utensils have a waterproof coating on the surface. Gypsum chopsticks raw materials: gypsum powder 71-84%, polyvinyl alcohol resin 4-15%, starch 3-7%, talcum powder 3-7%, fiber 0-8%; add water accounting for 30% of the total weight of the above raw materials . The gypsum chopsticks of the present invention are free from bending and deformation, comfortable to the touch, practical and hygienic, and can be made into high, medium and low grade varieties. Gypsum is an edible natural non-toxic and harmless raw material with low manufacturing cost. It will not cause pollution and damage to the environment after being used and discarded.

The invention discloses a preparation method for 2-phenylpropionic acid. The preparation method is characterized by comprising a 2-phenyl-2-cyano methyl propionate preparation stage, a 2-phenyl propionitrile preparation stage and a 2-phenylpropionic acid preparation stage, wherein the 2-phenyl-2-cyano methyl propionate preparation stage comprises: mixing benzyl cyanide, dimethyl carbonate, methylbenzene and sodium methoxide to obtain a mixture, heating the mixture to 20-100 DEG C, controlling the pressure to 0.5-6MPa and carrying out thermal-insulation reaction for 1-10 hours; after the reaction is ended, steaming out a byproduct methanol under the normal pressure, cooling the mixture to 35 DEG C, dropwise adding dimethyl sulfate DMS at constant speed by controlling the temperature to 35-85 DEG C, and carrying out the thermal-insulation reaction for 1-10 hours at 45-105 DEG C after the dropwise-adding is ended; cooling to 35 DEG C, adding water, stirring, dissolving, and layering; desolventizing to recycle toluene, thereby obtaining compound ester; and carrying out basic hydrolysis reaction and acidification reaction to finally prepare a finished product, wherein the purity of the finished product is high, and the yield of the finished product is higher than 92%. Besides, the production process disclosed by the invention adopts simple equipment and is low in production cost.

The invention provides a preparation method of nanoscale zirconia ceramic powder for spraying. The preparation method provided by the invention comprises the following steps of ingredient ball milling, atomization drying, sieving gradation, dry-pressing molding, sintering compaction, crushing polishing, autogenous grinding trimming, and screening detection. The preparation method provided by the invention has the advantages that nanoscale yttria-stabilized zirconia ceramic powder for spraying is directly prepared by high temperature ceramic preparation and crushing and through high-temperature sintering at a temperature of 1500 to 1600 DEG C in preparation, ZrO2 has a yttria-stabilized zirconia (YSZ) crystal structure or a yttria-partially stabilised zirconia (PYSZ) crystal structure at ahigh temperature, in other word, ZrO2 comprises monoclinic crystals and cubic crystals; the YSZ crystal structure or the PYSZ crystal structure has high strength, high toughness, good wear resistance, good high temperature resistance, good corrosion resistance, high rigidity, no magnetic conductivity and an electrical insulating property; the nanoscale zirconia ceramic powder obtained by the preparation method has density of 6.00g / cm<3>, Moh's hardness of 9, compressive strength of 1170Mpa and good thermal shock resistance; and through granulator-based autogenous grinding trimming, the nanoscale zirconia ceramic powder obtained by the preparation method has volume density of 1.15 to 1.45g / m<2> (min)% and good fluidity.