Method for production of hot-melt pressure-sensitive adhesive by twin-screw extruder

Abstract

The invention discloses a method for production of a hot-melt pressure-sensitive adhesive by a twin-screw extruder. Particularly, the method is implemented on the twin-screw extruder, raw materials of the hot-melt pressure-sensitive adhesive are divided into three types, each raw material is input into the twin-screw extruder respectively through a first feeding part, a second feeding part, and a third feeding part arranged on the twin-screw extruder, in an operation process of the twin-screw extruder, the hot-melt pressure-sensitive adhesive raw materials are subjected to hot melting and homogenization, thus extruding the hot-melt pressure-sensitive adhesive. The invention mainly has the following features that: (1) the method adopts continuous production with high production efficiency, which is about 2.5-3 times of that of traditional reaction kettles; (2) the production time is short, the time from adding of the raw materials into the twin-screw extruder to production of the hot-melt pressure-sensitive adhesive product is less than 5min, and even including cooling packaging, the time does not exceed 0.5h; and (3) the produced finished adhesive product has stable performance, because of a short production process, the molecular chain segment of a high molecular adhesive is not easy to fracture and age, so that the product performance can be good.

Description

technical field [0001] The invention relates to a method for producing adhesive products, in particular to a method for producing hot-melt pressure-sensitive adhesive by using a twin-screw extruder. Background technique [0002] Hot-melt pressure-sensitive adhesive is a kind of pressure-sensitive adhesive, which refers to a type of adhesive that is sensitive to pressure and can be bonded to the adherend with a little finger pressure, without the use of solvents or other auxiliary means. Hot-melt adhesive pressure-sensitive adhesive is a new type of adhesive tape made of synthetic rubber, resin and rubber oil mixed and heated into a molten state and then coated on paper, cloth or plastic film and other substrates. Its biggest advantage is that it is mainly used for all kinds of box sealing, box sealing, self-adhesive paper, label label, beverage bottle label, sealing aluminum foil, flexible packaging and other packaging and environmentally friendly paper pallets, etc., ad...

AI Technical Summary

Problems solved by technology

At present, most of the production of hot-melt pressure-sensitive adhesives is produced in batch-type reactors, and the production efficiency is low. Generally, it takes 3-4 hours to produce one kettle.

Due to the low production efficiency, the production cost of the hot-melt pressure-sensitive adhesive is relatively high; in the production process of the prior art hot-melt pressure-sensitive adhesive, due to the long time, the SIS resin and tackifying resin of its main raw material polymer are easy to Decomposition into small molecules affects the performance of the hot-melt pressure-sensitive adhesive, causing defects in the physical properties of the glue, making the product quality not stable enough, the performance deviation of different batches of hot-melt pressure-sensitive adhesive is large, and even irregular quality problems occur

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