PVB (Polyvinyl Butyral) production equipment and production process for single-screw extrusion

Abstract

The invention discloses PVB (polyvinyl butyral) production equipment adopting single-screw extrusion and a production process. The PVB production equipment comprises a resin storage bin; a feeding hole of the double-screw premixing machine is connected with a discharging hole of the resin storage bin through a weight loss metering system I; a feeding hole of the horizontal material mixing machine is connected with a discharging hole of the double-screw pre-mixing machine, and a weighing sensor is arranged on the horizontal material mixing machine. According to the PVB production equipment and the production process for single-screw extrusion, the process is adopted for production, PVB resin powder, a plasticizer, an aqueous solution additive and the like are premixed, the whole process approximately needs more than 15 minutes, the resin powder and the liquid plasticizer are fully absorbed and uniformly dispersed, the performance of a PVB membrane is qualitatively improved, and the production efficiency is improved. The performance uniformity and balance are realized; meanwhile, a single-screw production process is adopted, forced feeding is adopted, stable extrusion can be achieved, the quality is reliable, the product is sound-proof and heat-proof, and improvement of the product quality is facilitated.

Description

technical field [0001] The invention relates to the technical field of automobile laminated glass, in particular to a single-screw extruded PVB production equipment and a production process. Background technique [0002] Laminated glass, also known as laminated glass, is composed of two or more pieces of glass with one or more layers of organic polymer interlayers sandwiched between them. After special high temperature pre-pressing (or vacuuming) and high temperature and high pressure processing, A composite glass product that permanently bonds the glass to the interlayer. Commonly used interlayer films for laminated glass are: PVB, SGP, EVA, PU, ​​etc. Automotive laminated glass usually adopts PVB interlayer. [0003] At present, all PVB film production processes in China are extruded by twin-screw extruders, and plasticizers are produced in the barrel injection process. In this process, the residence time in the extruder is very short after the plasticizer is injected, ...

AI Technical Summary

Problems solved by technology

In this process, due to the short residence time in the extruder after injection of the plasticizer, it is extruded to the screen changer—melt pump—filter—second melt pump—static mixer—in less than one minute. Die outlet, which will cause serious uneven dispersion between plasticizer (including other additives) and PVB resin; at the same time, studies have proved that PVB film produced by twin-screw extrusion process, even in the same product volume, Sampling and analysis at different locations, its physical and mechanical properties, and glass bonding performance are quite different

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