Supercritical fluid micro-foaming screw rod mixing device and method

A supercritical fluid and screw mixing technology, which is applied in the field of polymer processing and molding machinery, can solve problems such as low efficiency, hole blockage, and inability to uniformly distribute supercritical fluid, so as to improve mixing dispersion, rapid and uniform distribution, and improve mixing uniformity. the effect of the effect

CN111823535AActive Publication Date: 2020-10-27QINGDAO UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-10-27

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Abstract

The invention discloses a supercritical fluid micro-foaming screw rod mixing device and method, and belongs to the technical field of polymer processing and forming machines. The supercritical fluid micro-foaming screw rod mixing device comprises a device barrel and a micro-foaming screw rod driven by a power device; the micro-foaming screw rod is provided with a screw rod center blind hole and supercritical fluid supplying holes; the open end of the screw rod center blind hole is connected with a gas conveying opening of a supercritical fluid generator; and the multiple supercritical fluid supplying holes are evenly distributed in the circumferential direction of the micro-foaming screw rod, one ends of the supercritical fluid supplying holes communicate with the screw rod center blind hole, and the other ends of the supercritical fluid supplying holes communicate with a space between the micro-foaming screw rod and the device barrel. The method adopts the device, a supercritical fluid conducts circumferential gas injection from the interior of the micro-foaming screw rod to a polymer melt, and thus the supercritical fluid in an initial state is circumferentially and evenly dispersed in the polymer melt; and in addition, the micro-foaming screw rod is provided with a grooved multiple thread structure with a turbulence nail, and the mixing homogenization capacity of the screw rod is improved.
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Description

technical field

[0001] The invention belongs to the technical field of polymer processing and molding machinery, and in particular relates to a supercritical fluid micro-foaming screw mixing device and method. Background technique

[0002] with supercritical CO 2 or N 2 The micro-foaming technology, which is a physical foaming agent, is becoming more and more popular all over the world due to its advantages of high dimensional stability, low residual stress, and light weight, and is widely used in the fields of injection molding and extrusion molding. Micro-foam molding requires filling the melt with a supercritical fluid foaming agent, and the supercritical fluid must be uniformly dispersed in the polymer melt to form a polymer / supercritical fluid homogeneous system. Polymer / supercritical fluid homogeneous system is the key stage of micro-foaming molding. This process directly affects the subsequent cell nucleation and growth. Therefore, the mixing and homogenization abil...

Examples

Embodiment Construction

[0035]The implementation mode of the present invention is illustrated by specific specific examples below, and those who are familiar with this technology can easily understand other advantages and effects of the present invention from the contents disclosed in this description. Obviously, the described embodiments are a part of the present invention. , but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0036] Terms such as "front", "rear", "left", "right", "inner", "outer", and "middle" quoted in this specification are only for the convenience of description, not for Limiting the practicable scope of the present invention, and the change or adjustment of the relative relationship shall also be regarded as the practicable scope of the present invention without substantive changes in the technical...