CN-121988252-A - PVB emulsion preparation device and method

CN121988252ACN 121988252 ACN121988252 ACN 121988252ACN-121988252-A

Abstract

The invention provides a PVB emulsion preparation device and a PVB emulsion preparation method, wherein the PVB emulsion preparation device comprises a reaction kettle body and a stirring unit; the stirring unit comprises a hollow shaft, a blade mounting seat, a stirring blade, a stress piece, a transmission screw rod, a reciprocating driving assembly and a driving mechanism. The invention forms a composite stirring structure capable of realizing the simultaneous rotation and axial reciprocation of the stirring blade by arranging the stirring unit composed of the hollow shaft, the blade mounting seat, the stirring blade, the stress piece, the transmission screw rod and other parts. The structural design ensures that fewer stirring blades can cover more ranges in the reaction kettle body, effectively improves the problem of stirring dead angles of the fixed stirring blades, ensures that materials in each area in the reaction kettle body can participate in effective circulation as much as possible, and remarkably improves the mixing uniformity and the reaction efficiency of PVB emulsion.

Inventors

PENG FENG
LUO JIANGHUAI
CHEN JIE
Luo Liangxuan

Assignees

成都龙成高新材料有限公司

Dates

Publication Date: 20260508
Application Date: 20260311

Claims (10)

1. The utility model provides a PVB emulsion preparation facilities, includes the reation kettle body and stirring unit, its characterized in that, stirring unit includes: The reaction kettle comprises a reaction kettle body, a hollow shaft, at least one avoidance channel, a plurality of guide rails and a plurality of guide rails, wherein the reaction kettle body is internally provided with the hollow shaft; The sliding guide structure is used for enabling the blade mounting seat to rotate along the hollow shaft and allowing the blade mounting seat to move along the axial direction of the hollow shaft; at least one stirring blade fixedly arranged on the blade mounting seat; The stress piece is fixedly arranged on the blade mounting seat and extends into the hollow shaft through the avoidance channel; The transmission screw rod is coaxially arranged in the hollow shaft; The reciprocating driving assembly is in threaded fit with the transmission screw rod and in transmission fit with the stress piece, and is used for converting the rotation motion of the transmission screw rod into axial movement and driving the blade mounting seat to move along the axial direction of the hollow shaft through the stress piece; And the driving mechanism is simultaneously connected with the hollow shaft and the transmission screw rod in a transmission way and is used for simultaneously driving the hollow shaft and the transmission screw rod to rotate.
2. The PVB emulsion preparation apparatus of claim 1 wherein the sliding guide structure comprises an axially extending projection disposed on the outer wall of the hollow shaft and a groove disposed on the inner wall of the blade mount; The groove is in sliding fit with the axially extending projection.
3. The apparatus for preparing a PVB emulsion of claim 1 wherein the reciprocating drive assembly comprises a first force application member and a second force application member in threaded engagement with the drive screw; The first force application piece and the second force application piece are circular and are respectively positioned above and below the stress piece, and the circumferential outer walls of the first force application piece and the second force application piece are in contact with the inner wall of the hollow shaft; the lower surface of the first force application piece is contacted with the upper surface of the force receiving piece, and the upper surface of the second force application piece is contacted with the lower surface of the force receiving piece.
4. The apparatus for preparing a PVB emulsion of claim 3 wherein a direction of rotation of said drive screw is opposite a direction of rotation of said hollow shaft.
5. The apparatus for preparing PVB emulsion of claim 3, wherein the first force application member and the second force application member are each provided with a through passage penetrating in an axial direction.
6. The apparatus of claim 5, wherein the portion of the force receiving member between the first force applying member and the second force applying member is provided with an auxiliary agitation structure.
7. The PVB emulsion preparation apparatus of claim 4 wherein the circumferential outer walls of the first force application member and the second force application member are each provided with a spiral flow guide structure extending in the axial direction; The spiral flow guide structure is used for guiding the material attached to the inner wall of the hollow shaft to flow along the axial direction when the force application part moves along the axial direction.
8. The PVB emulsion preparation apparatus of claim 1 wherein the drive mechanism comprises: the first transmission gear is fixedly arranged on the transmission screw rod; the second transmission gear is fixedly arranged on the hollow shaft; the output end of the driving motor is simultaneously connected with the first transmission gear and the second transmission gear in a transmission way.
9. The apparatus of claim 8, further comprising a controller electrically coupled to the drive motor for controlling the vane mount to move axially upward at a first speed and axially downward at a second speed; The first speed is greater than the second speed.
10. A method of preparing a PVB emulsion using the PVB emulsion preparation apparatus of claim 9, comprising the steps of: S10, dissolving materials, namely putting PVB resin and a solvent into a reaction kettle body, heating to a first preset temperature, preserving heat, stirring for a first preset time, and fully dissolving the PVB resin to obtain a solution; Step S20, alkali catalytic emulsification, namely sequentially adding a composite plasticizer and a composite emulsifier into the solution, stirring and uniformly mixing, dropwise adding alkali liquor, and reacting for a second preset time at a second preset temperature to obtain a primary emulsion; S30, shearing and emulsifying, namely adding acrylic ester core-shell emulsion into the primary emulsion, shearing and stirring at a rotating speed of 2500-3200rpm at a third preset temperature, and emulsifying for a third preset time to obtain composite emulsion; s40, thickening, namely adding a compound thickening agent into the composite emulsion, and stirring for at least 20min to obtain PVB emulsion; In the stirring process in the steps S10 to S40, the hollow shaft and the transmission screw rod are driven to synchronously rotate, so that the blade mounting seat and the stirring blade move along the axial direction of the hollow shaft while rotating along with the hollow shaft, wherein in the process of axially moving the blade mounting seat and the stirring blade, the blade mounting seat moves upwards along the axial direction at the first speed and moves downwards along the axial direction at the second speed.

Description

PVB emulsion preparation device and method Technical Field The invention relates to the technical field of reaction kettles for preparing PVB (polyvinyl butyral) emulsion, in particular to a PVB emulsion preparation device and method. Background The statements in this section merely provide background information related to the present disclosure and may not constitute prior art. PVB emulsion (also called as polyvinyl butyral emulsion) is an important polymer material, and the building energy-saving heat-insulating material (such as a heat-insulating PVB film), the building energy-saving sound-insulating material (such as a sound-insulating PVB film and composite sound-insulating glass) and the like which are further prepared from the PVB emulsion have wide application prospects in the field of building energy conservation, and higher requirements are put forward on the quality of the PVB emulsion. In the related art, the PVB emulsion preparation process is generally performed in a reaction kettle, and materials required for preparing PVB are fully mixed and condensation reaction is completed through a stirring unit of the reaction kettle. In the preparation process of PVB emulsion, the mixing uniformity, the reaction efficiency and the quality stability of the final product of the PVB emulsion are directly influenced by the stirring effect. The reaction kettle for preparing the PVB emulsion is mainly designed to be fixed by adopting stirring blades, and the fixed stirring blades can only stir in a fixed stirring area, so that stirring dead angles are easily formed in the reaction kettle in an area away from the stirring blades, and materials at the stirring dead angles are difficult to participate in effective circulation in the PVB emulsion preparation process, so that partial reaction is insufficient, and the mixing uniformity of the PVB emulsion is affected. To above-mentioned problem, a simple solution is to increase more stirring vane, covers more stirring district through the multilayer stirring vane that sets up along the reation kettle axial, but this kind of scheme can show the effective volume that occupies in the reation kettle, reduces the material loading, reduces production efficiency, leads to reation kettle inner structure complicacy, residual risk to rise simultaneously, influences product batch stability. Disclosure of Invention In view of the foregoing, it is a first object of the present invention to provide a PVB emulsion preparation apparatus, which at least overcomes the above-mentioned problems caused by the fixed design of stirring blades or the addition of more stirring blades in the known reaction kettle for preparing PVB emulsion. A second object of the present invention is to provide a method for preparing PVB emulsion using the PVB emulsion preparation apparatus described above. The aim of the invention is achieved by the following technical scheme: in a first aspect, the invention provides a PVB emulsion preparation device, which comprises a reaction kettle body and a stirring unit; the stirring unit includes: The reaction kettle comprises a reaction kettle body, a hollow shaft, at least one avoidance channel, a plurality of guide rails and a plurality of guide rails, wherein the reaction kettle body is internally provided with the hollow shaft; The sliding guide structure is used for enabling the blade mounting seat to rotate along the hollow shaft and allowing the blade mounting seat to move along the axial direction of the hollow shaft; at least one stirring blade fixedly arranged on the blade mounting seat; The stress piece is fixedly arranged on the blade mounting seat and extends into the hollow shaft through the avoidance channel; The transmission screw rod is coaxially arranged in the hollow shaft; The reciprocating driving assembly is in threaded fit with the transmission screw rod and in transmission fit with the stress piece, and is used for converting the rotation motion of the transmission screw rod into axial movement and driving the blade mounting seat to move along the axial direction of the hollow shaft through the stress piece; And the driving mechanism is simultaneously connected with the hollow shaft and the transmission screw rod in a transmission way and is used for simultaneously driving the hollow shaft and the transmission screw rod to rotate. Optionally, the sliding guide structure includes an axially extending protrusion disposed on an outer wall of the hollow shaft, and a groove disposed on an inner wall of the blade mount; The groove is in sliding fit with the axially extending projection. Optionally, the reciprocating driving assembly comprises a first force application member and a second force application member which are in threaded fit with the transmission screw rod; The first force application piece and the second force application piece are circular and are respectively positioned above and below the stress piece, and the circumferential o