Plastic of phenolic aldehyde mould in no ammonia type, and manufacturing method

Abstract

This invention relates to a method for preparing ammonia-free phenol formaldehyde molding material. The ammonia-free phenol formaldehyde molding material comprises: acid-catalyzed thermoplastic phenol formaldehyde resin 20-50%, curing agent 10-45%, curing accelerator 0.5-4%, organic filler 10-40%, and inorganic filler 10-40%, and lubricant 1-3%. The curing agent is at least one of melamine formaldehyde resin and urea formaldehyde resin. The curing agent is at least one of melamine formaldehyde resin and urea formaldehyde resin. The curing accelerator is at least one of MgO, Mg (OH) 2, CaO and Ca (OH) 2. The organic filler is fiber powder of at least one of wood, bamboo, cotton and hemp. The inorganic filler is at least one of CaCO3, talcum, mica, quartz and asbestos powder. The lubricant is at least one of stearic acid, zinc stearate and ethylene stearamide. The method has such advantages as simple process and low cost. The product has such advantages as no free ammonia, stable quality and long storage period, and can be used to manufacture instrument components.

Description

technical field [0001] The invention relates to a phenolic molding compound, in particular to a method for manufacturing an ammonia-free phenolic molding compound by a two-step method. Background technique [0002] Ammonia-free phenolic molding compound is an important molding material for manufacturing instrument structures. It can avoid the corrosion of metal parts caused by free ammonia in ordinary phenolic molding compound components, and is of great significance for improving the reliability and service life of instruments. [0003] Ordinary phenolic molding compounds are generally produced by a two-step process (also known as dry process). It can be solidified and formed, so it is called two-step method), adding various fillers and additives, and compounding by heating roll pressing or screw extrusion. Because the two-step production process is simple, the technical requirements are not high, the manufacturing cost is low, and the product storage period is long, it is...

AI Technical Summary

Problems solved by technology

However, the quality control in the synthesis process of thermosetting liquid phenolic resin and the drying process of molding compound manufacturing is difficult and the technical requirements are high, and the thermosetting liquid phenolic resin contains a large amount of free aldehyde, which will volatilize in large quantities during the production process, which is harmful to the workplace. Both the environment and the external environment cause pollution; in addition, the product stability of the one-step method is poor and the storage period is short

These disadvantages make the production cost of one-step products too high and uncompetitive