Dry one-step method for preparing glass fiber modified amino molding plastic

Abstract

The invention discloses a dry-type one-step method for preparing glass fiber modified amino molding plastic. The method comprises the following steps: preparing a dispersing agent, a lubricating agent and a coupling agent I into an aqueous solution A in proportion; the preparation method comprises the following steps: adding amino resin powder, inorganic filler, wood pulp cellulose, a release agent and pigment into a horizontal paddle stirrer according to a ratio, stirring, uniformly spraying the aqueous solution A into the horizontal paddle stirrer by using a spraying machine, and adding the treated glass fiber chopped strands; conveying the mixed materials into a hopper of a metering screw rod by using a spiral conveyor; starting a reciprocating single-screw mixing extruder, and sequentially starting an oil pump, a main machine screw, a lateral feeder screw and a metering screw; and after the materials are extruded and caked from the reciprocating single-screw mixing extruder, the conveying and granulating equipment is started. According to the method, the amino molding compound with excellent performance can be prepared, meanwhile, the preparation procedures of amino molding can be reduced, the production efficiency of the molding compound is greatly improved, and the energy consumption and the labor force are reduced.

Description

technical field [0001] The invention belongs to the technical field of plastic manufacturing, and in particular relates to a dry one-step method for preparing glass fiber modified amino molding compound. Background technique [0002] Amino molding compound is a kind of thermosetting plastic compounded by polycondensation of formaldehyde, urea and melamine resin and various additives. It has the advantages of easy molding, low molding shrinkage, high dimensional accuracy, and good processing performance. Its products have excellent heat resistance, flame retardancy and good mechanical strength. This material can be widely used in products closely related to daily life, such as: door handles, toilet covers, bathroom racks, computer keyboards, mice, fax telephones, ATM automatic teller machines, children's products, toys, chess and so on. The product has excellent electrical insulation, resistance characteristics and excellent insulation effect. It can strongly resist arc ligh...

AI Technical Summary

Problems solved by technology

[0003] The fibers used in amino molding compounds are mainly α-cellulose, and its products have high hardness and brittleness, but the strength, heat resistance and dimensional stability of the products cannot meet the requirements of high-performance electrical accessories and other fields.

However, the traditional amino molding compound production process has many processes, such as resin synthesis, kneading, drying, crushing, ball milling, sieving, etc., and granulation and other processes are required for injection plastics, and the production efficiency is low.

[0004] As the most widely used inorganic fiber, glass fiber can greatly improve the strength, heat resistance and dimensional stability of plastic products. In the field of thermosetting plastics, it is mostly used to strengthen thermosetting plastics such as epoxy, polyurethane, phenolic and unsaturated polyester. , but few reports have been used to reinforce aminoplasts

On the other hand, the traditional process uses twin-screw extrusion mixer to disperse glass fiber chopped strands to prepare glass fiber modified plastics, but for glass fiber modified amino molding compound, the traditional twin-screw extrusion process is not suitable

In the process of dispersing glass fiber chopped strands by the twin-screw extruder, a large amount of heat will be generated, and the temperature of the material will rise sharply, while the amino molding compound is sensitive to heat, and can be solidified and formed above 120 ° C. Using twin-screw extrusion When the glass fiber modified amino molding compound is prepared by the mixer, the final product often loses processing performance because the friction temperature is too high. In this case, the higher the glass fiber content, the more serious it is.