139results about How to "Promote esterification reaction" patented technology

The invention relates to a preparation method of cellulose acetate propionate, belonging to technical field of cellulose modification. The preparation method of cellulose acetate propionate comprises the following steps of: taking cellulose as a raw material, activating by a mixed solution of acetic anhydride and propionic anhydride, adding acetic acid and propionic acid solvents and a solid super acidic catalyst for esterification, after esterification, filtering to remove the catalyst, adding waste acid water for hydrolyzing, settling out by waste acid water, and finally obtaining the cellulose acetate propionate by steps of filtering, washing, drying and the like. The production process is simple to operate, the solid super acidic catalyst substitutes the concentrated sulfuric acid catalyst and can be cyclically used for many times, thus alleviating the problem of serious corrosion of the original process equipment. The waste acid water generated in the reaction process only contains acetic acid and propionic acid without sulfuric acid and can be fully recovered and cyclically used, thus decreasing the tension in environmental protection, realizing zero discharge and greatly reducing the production cost. The cellulose acetate propionate prepared by the method has fine toughness, heat stability and compatibility, thus being extensively used.

The invention relates to a wood-plastic composite material and a preparation method thereof, belonging to the field of molecular materials. The wood-plastic composite material comprises the following raw materials in parts by weight: 80-110 parts of plant fiber, 50-90 parts of grafting plastic, 0.2-5 parts of catalyst, 0.2-2 parts of antioxidant and 0.3-3 parts of lubricant, wherein the catalyst is selected from one or more of sodium hydrogen sulfate, potassium hydrogen sulfate, ammonium dihydrogen phosphate, sodium dihydrogen phosphate, ammonium polyphosphate and SO4<2-> / MxOy type solid super-strong acid. According to the invention, the performance advantages of the plant fiber and the grafting plastic are used; and the esterification reaction between the plant fiber and the grafting plastic is promoted through a method of adding the catalyst, and the interface compatibility of the plant fiber and the grafting plastic is improved, thus enhancing the mechanical performance of the wood-plastic composite material.

The invention relates to the field of concrete, and particularly discloses concrete utilizing industrial solid waste and a preparation method of the concrete, and the concrete utilizing the industrial solid waste is prepared from the following raw materials in parts by weight: 260-270 parts of cement; 45-55 parts of fly ash; 35-45 parts of mineral powder; 710-720 parts of fine sand; 990-1000 parts of broken stone; 10-12 parts of a water reducing agent; 140-160 parts of water; and 100-150 parts of modified waste polyurethane particles; wherein the modified waste polyurethane particles are obtained by coating the surfaces of waste polyurethane particles with modified slurry and curing, and the modified slurry is prepared from cement, a cement accelerator, plant fibers and water. The concrete has the advantage that the thermal insulation property and compressive strength of the concrete are improved.

The invention relates to a process of producing a cellulose carbamate fiber filament, and belongs to the technical field of cellulose carbamate fiber production. Through specific cellulose activation, cellulose carbamate preparation, cellulose carbamate solution preparation, and spinning steps, a complete cellulose carbamate fiber filament producing process having a high degree of completion is formed. A prepared spinning stock solution has good spinnability, a final product has good performance, the process is particularly suitable for industrial large-scale production, and the production cost, the production efficiency and product quality are all taken into account.