Device and method for preparing pre-foamed microcapsules

Abstract

The invention provides a device and method for preparing pre-foamed microcapsules. The device comprises (1) a feeding device, (2) a foaming device, wherein the foaming device sequentially comprises afeeding area, a dispersing area, a preheating area, a heating area and a cooling area in the transverse direction, the feeding area, the dispersing area, the preheating area, the heating area and thecooling area comprise integrally continuous shaftless screw structures, the feeding device is arranged in the feeding area, and the interior of the feeding device is communicated with the interior ofthe feeding area, (3) an in-cylinder blower device which is arranged in the dispersing area, wherein the interior of the in-cylinder blower device is communicated with the interior of the dispersing area, and (4) a collecting device which is arranged in the cooling area, wherein the interior of the collecting device is communicated with the interior of the cooling area. According to the preparation method, the foamable microcapsules can be effectively prevented from being bonded with one another in the heating foaming process, so that the non-caking pre-foaming microcapsules can be efficientlyand controllably prepared.

Description

technical field [0001] The invention belongs to the field of chemical machinery, and relates to a device for preparing pre-foaming microcapsules and a method for preparing pre-foaming microcapsules using the device. Background technique [0002] Pre-foamed microcapsules are a kind of foamable microcapsules that are heated. Once the foaming agent in the capsule shell is heated, the foaming agent evaporates to generate internal pressure. At the same time, as the capsule shell softens, the microcapsules foam. The diameter is usually increased by about 2 to 5 times and the prepared density is 0.015-0.3Kg / m 3 The core-shell structure polymer microcapsule filler has a diameter of 10 to 500um. [0003] Foamable microcapsules are microcapsules with a core-shell structure synthesized by suspension polymerization, which are composed of an airtight shell and a foaming agent sealed inside. capsule. As a lightweight filler, pre-foamed microcapsules are widely used in industrial fields...

AI Technical Summary

Problems solved by technology

[0006] CN105396524B provides a kind of foamed microcapsule preparation device; Said device can effectively prevent microcapsule foaming agent from agglomerating in the foaming process by setting adding turbulent flow device, setting open cylinder structure and arc converging section, but Its production efficiency is low, operability is poor, equipment utilization rate is low, and the production process of pre-expanded microcapsules in different temperature ranges cannot be adjusted at any time

[0007] US5342689 has described the method for preparing pre-expanded microcapsules, wherein microcapsules are mixed with surface barrier coating to prevent agglomeration in foaming step, but solid processing aid, consumption is very high, makes in controlling microcapsule foaming degree of difficulty

[0008] CN105150494A proposes a kind of equipment and method for continuously preparing pre-foaming microcapsules, which well solves the problems of bridging, clogging and poor fluidity of raw materials during feeding, wherein twin-screws are used to realize the continuous preparation of pre-foaming of filter cake Microcapsules, but there are problems such as high operating temperature and microcapsules are prone to sticking to rollers

[0009] CN100429061C proposes a method for preparing foamed thermoplastic microspheres by filling foamed microspheres into a foaming device. The foaming device has a hollow body that surrounds the rotary feeder, and the outer surface of the rotary feeder One or more scrapers are set between the diameter and the inner diameter of the hollow body, which can prevent the accumulation of the microsphere layer in the foaming equipment, but the equipment is bulky, the feeding procedure is complicated, and the equipment loss rate is high, especially the inner scraper Easy to wear, unable to operate continuously for a long time, and the agglomeration of foamed microspheres has not been completely resolved

[0010] The method and device mentioned in the above-mentioned patent are to further heat and foam the foamable microcapsules to prepare pre-foamed microcapsules, but in the complete foaming process of the foamable microcapsules, due to the high temperature required for complete foaming will The problem of agglomeration caused by the thin thermoplastic shell of the microcapsule becoming soft and sticking together, the problem of agglomeration and insufficient foaming when the foaming microcapsule is heated by the device and method of the above-mentioned patent cannot be solved

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