A compound amino molding compound particle granulation process and equipment

Abstract

The invention relates to the technical field of amino molding plastics production, and provides a granulation process for composite amino molding plastics, which is characterized in that it comprises the following steps: ① raw material preparation: preparing amino molding powder and feed liquid; ② powdering: mixing amino molding The plastic powder is put into the granulator, and the amino molding powder is beaten into a suspended state with a stirring device, and the suspension height is 35-50cm; ③Spray granulation: Spray the material liquid spray evenly from top to bottom above the amino molding powder, At the same time, a cutting knife is used in the powder-mist mixing area to carry out rotary cutting and granulation, and its corresponding granulation equipment is disclosed. The invention greatly shortens the granulation time, improves the production capacity, has low equipment energy consumption, high particle uniformity, and the reaction The activity, particle size and molding time of the resin are controllable.

Description

technical field [0001] The invention relates to the technical field of amino molding compound production, in particular to a composite amino molding compound particle granulation process and equipment. Background technique [0002] Amino molding compound, commonly known as electric jade powder, is made by adding other fillers, release agents, curing agents, pigments, etc. to amino resin as a matrix, and undergoes a certain plasticization process. Due to the low price of raw materials, simple production process, easy environmental protection, bright color, smooth appearance, odorless and tasteless, self-extinguishing and arc resistance, heat resistance, flame retardant, low smoke, stable product size, good electrical insulation and easy Coloring and other advantages, so it is widely used in electronics, electrical appliances, automobiles, machinery, household utensils and other industries (especially melamine plastics). [0003] There are three kinds of granulation processes...

AI Technical Summary

Problems solved by technology

[0003] There are three kinds of granulation processes for amino molding compound particles in the prior art: the first one is a one-step method, that is, the wood pulp is cut into small pieces, and an appropriate amount of melamine, formaldehyde, zinc stearate, titanium dioxide, and urethane are added to the reaction kettle. Raw materials such as tropin are stirred and reacted at a certain temperature and time, and the water is extracted by negative pressure to obtain granular amino molding compound. This process generally takes 3.5 hours, and a large motor of 120kW is required to drive the stirring knife to react, which consumes a lot of energy. The production capacity is low, and the invention patent application with the application number 201410002732.4 has announced a method for the rapid production of amino molding plastics. Formaldehyde solution, urea, melamine, additives, caustic soda, filling materials and other materials are input into the vacuum granulation reactor integrated machine. Polymerization, kneading, dispersion, and drying are completed in one step, and the whole process is completed in two hours. However, the granules prepared by this method have the disadvantages that product performance, color, and moisture are difficult to control, and the yield is low, and the energy consumption of the equipment is high.

[0004] The second is the two-step method, that is, the powdery amino molding compound is extruded by twin-screws to obtain flat strips, and then crushed and ball-milled into granular small pieces, but the flow properties of the particles obtained by this method are uncontrollable, and the viscosity is low. When it is high, it is easy to choke the equipment, high energy consumption, low production capacity, and the granular product is granular with poor uniformity

[0005] The third is spray granulation. For example, the utility model patent application number 201120054654.4 discloses a spray granulation fluidized bed dryer with a knife, and the air distribution chamber, granulation drying chamber and settling chamber are arranged in sequence from bottom to top. , the two sides of the lower part of the granulation drying chamber are symmetrically equipped with multiple knife combinations, spray guns, and powder circulation return ports, which are suitable for rough fermentation liquid, fermented yeast liquid and Other components, as well as large-scale continuous one-step granulation and drying of liquid materials such as monosodium glutamate mother liquor, spherical calcium chloride, large-grain urea, and salinomycin, but the spray guns of this equipment are set on both sides of the knife combination, and the material liquid passes through The spray gun is sprayed into fine droplets, and the high-speed mechanical rotation force of the knife set in the parallel direction stirs and breaks the material. The contact between the material and the knife is not sufficient in this granulation method, and the granulation uniformity is poor.

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