Method for continuously extrauding super-high molecular-weight polytene composite material by double screw-rod

Abstract

The method for continuously extruding ultrahigh molecular weight polyethylene composite material by using extruder twin screw is characterized by that 100 portions of polyethylene whose molecular weight is 150-350 ten thousand, 10-30 portions of flow modifying agent, 10-20 portions of filling reinforcing agent, 0.2-5 portions of coupling agent, 0.1-5 portions of lubricating agent, 0.1-1 portions of nuclear-forming agent and 0.1-10 portions of fire-resisting agent are added into a high-speed mixing machine, mixing at 100-120 deg.C for 20-30 min. to obtain the ultrahigh molecular weight polyethylene composite granule (powder) material said material is added into a meshed equidirectional rotation extruder twi screw, and continuously formed in forming machine cylinder with 200-250 deg.c, then formed, cooled, drawn and cut to obtain the product.

Description

1. Technical field [0001] The invention relates to a method for continuously extruding polyethylene composite materials with interlocking co-rotating twin-screw rods, belonging to the field of polymer molding and processing. 2. Background technology [0002] Ultra-high molecular weight polyethylene is a thermoplastic engineering plastic with a viscosity average molecular weight greater than 1.5 million, which is polymerized by ethylene and butadiene under the action of a catalyst. This product has excellent comprehensive properties, such as wear resistance, low temperature resistance, and Corrosion, self-lubrication, anti-adhesion, impact resistance, etc. are the first in plastics, and are called "magic plastics". Because it has a much higher molecular weight than ordinary polymer materials, its melt viscosity is extremely high, its processing fluidity is extremely poor, and it is prone to melt fracture, so it is a difficult-to-form plastic. At present, there are three main...

AI Technical Summary

Problems solved by technology

At present, there are three main methods for processing ultra-high molecular weight polyethylene: molded into a certain shape, then heated and sintered to form a product, the product is dense, but the molding efficiency is extremely low; plunger-type push molding products can be formed into larger ultra-high Molecular weight polyethylene extruded products, but it is intermittent and the production efficiency is limited; the single screw extruder realizes continuous extrusion molding. This molding method makes the extrusion of ultra-high molecular weight polyethylene a continuous operation. Production The efficiency can be greatly improved, but the disadvantage is that the single-screw extruder does not convey the powder well, the mixing effect of the material is not strong enough, and the extrusion efficiency is still not very high.

Chinese patent 94107408 titled "Ultra-high molecular weight polyethylene pipe single-screw extrusion device", the purpose is to transform the ordinary single-screw extruder into UHMWPE pipes through screw structure modification, although it can make UHMW pipes Continuous, but its production efficiency and material mixing quality are still not ideal; Chinese patent 99114545 entitled "Enhanced wear-resistant ultra-high molecular weight polyethylene sheet and production method", the patent uses glass microspheres as a reinforced modification of ultra-high molecular weight polyethylene Adding a coupling agent and a compound dispersant to improve the surface hardness, wear resistance and rigidity of the product, but this patent still adopts the traditional molding and sintering molding method, intermittent production, and the production efficiency is relatively high. Low

Images