Polycondensation production technology of melamine moulding particles and melamine moulding powder

Abstract

The invention relates to a polycondensation production technology of melamine moulding particles and melamine moulding powder. The technology comprises the following steps: 1. in the slurry preparation phase, adding 55-65 parts of formaldehyde, 3-5 parts of thinner and 3-5 parts of water in a slurry reaction tank, heating and stirring, adjusting the pH value of slurry to 8.0-8.5 at 50 DEG C, adding 35-45 parts of melamine at 60 DEG C, heating for boiling to ensure the ratio of material to water to be 1:2, then performing cooling water circulation to reduce the temperature of material to 30-40DEG C, adding additives of which each accounts for 5-8 parts, stirring evenly, filtrating to prepare the desired slurry; 2. in the evaporation and polycondensation phase, adding the slurry in a vacuumwet pelletizing reaction tank, stirring at high speed, adding additives of which each accounts for 3-5% and 30-40% of auxiliary material, heating the materials to 70 DEG C to perform polymerization for 40min, breaking vacuum, reducing the temperature to 60 DEG C, discharging to obtain the finished melamine moulding particles; in addition, adding the melamine moulding particles in a grinder to grind to obtain the melamine moulding powder with the fineness of 80-100 meshes. The sealing production cycle is four hours, the charging powder yield is 60%, the water content of the finished product is3-5% and the cost of the finished product per ton is reduced by 500-900 RMB.

Description

technical field

[0001] The invention relates to a plastic production process, in particular to a production process of molding particles and molding powder. Background technique

[0002] Melamine molding granules and melamine molding powder are commonly used plastic basic raw materials, and are widely used in the manufacture of thermosetting plastics and rigid plastic structural parts. In recent years, due to the shortage of natural resources, the market demand for hard plastics has continued to expand, and the development prospects are good. At present, the production process of domestic melamine molding powder is to use formaldehyde and melamine as raw materials. It is pulped by integrating with wood pulp and dried in a mesh bag drying box to form a plate mold material, which is then crushed and ball milled to make a compact powder. Amine molding powder, the whole production process takes about 8 hours. This method is labor-intensive, consumes a lot of energy, pollutes t...