Transparent silicone rubber reciprocating two-stage mixing extruder complete set of equipment

Abstract

The invention discloses a set of equipment for a transparent silicone rubber reciprocating two-stage mixing extruder. Liquid raw materials and additives are stirred and mixed evenly by screws in the barrel of the first-stage twin-screw extruder, and flow into No. 1 Cooling in the tubular cooling device; the cooled first mixed colloid is fed into the screw mixing and conveying device, and the screw mixing and conveying device is connected with the silicon dioxide ultrafine powder supply metering system, and the measured silicon dioxide and The first mixed colloid is pre-mixed and fed to the second-stage reciprocating single-screw extruder to prepare the second mixed colloid; the outflow is pressurized by the melt metering pump and then enters the No. 2 tubular cooling device for cooling; The cooled second mixed colloid flows into the automatic quantitative sub-packing and packing system.

Description

technical field [0001] The invention relates to a set of equipment for a transparent silicone rubber reciprocating double-stage mixing and extruding machine. Background technique [0002] In recent years, silicone sealants have been developed faster and faster. At present, about 80% of the building curtain walls in China use silicone sealants, and they are also widely used in automobiles, electronics, and machinery industries. During the curing process of the silicone sealant, the crosslinking agent reacts with the base polymer to form a network Si-O-Si skeleton structure. The bond energy of Si-O-Si is higher than that of ultraviolet rays, and it can still ensure good adhesion and toughness under ultraviolet irradiation. Compared with other mechanical sealants, it has excellent high and low temperature resistance and weather resistance. At present, the common process of producing silicone sealant in China is to use a reactor to heat, stir, and mix silica gel, crosslinking ...

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Problems solved by technology

[0003] The disadvantages of this traditional production process are: using manual weighing, it is easy to cause dust pollution during the weighing process, and the measurement accuracy is unstable; the particle size of fumed silica is small (10-20nm), and the specific surface area is large (150 -200m 2 / g), it is very easy to be suspended in the air, so it is difficult to directly add to the colloid, and it is difficult to meet the process requirement of 15%. quality; the dispersing effect of fumed silica is not sufficient, and transparent neutral or acidic sealants cannot be produced; the production method is intermittent, the output is low, and efficient continuous production cannot be formed

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