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Preparation process of polypropylene physical foaming composite board

A physical foaming and preparation technology, applied in the field of polypropylene foaming, can solve the problems of low preparation efficiency, uneven mixing of molten liquid and supercritical CO2, low efficiency of composite boards, etc., and achieve the effect of enhancing uniformity

Inactive Publication Date: 2019-11-05
CHONGQING VOCATIONAL INST OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: the preparation efficiency of the existing gap-type PP physical foaming method is low, while the molten liquid and supercritical CO2 mixed by continuous extrusion foaming are not uniform, and the foaming performance is poor, which leads to the failure of the composite board. Preparation is either inefficient or performs poorly

Method used

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  • Preparation process of polypropylene physical foaming composite board
  • Preparation process of polypropylene physical foaming composite board
  • Preparation process of polypropylene physical foaming composite board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Such as Figure 1-Figure 3 As shown, the preparation process of polypropylene physical foam composite board includes the following steps:

[0042] Step 1: Add polypropylene granules to the reactor through feed port 3;

[0043] Step 2: feed supercritical CO2 into the reactor through vent 4;

[0044] Step 3: stirring to form a saturated molten liquid;

[0045] Step 4: Open the discharge valve 20, open the cylinder 7 to push the push plate 9 to move downward and inject the saturated molten liquid into the extrusion device 18, and at the same time, the screw 14 under the stirring shaft enters the discharge under the drive of the push plate 9 port 5 and screw extrude the saturated molten liquid at the discharge port 5.

[0046] The semi-continuous extrusion of polypropylene is realized by using the reaction kettle and the extrusion device 18, which not only realizes the sufficient mixing of polypropylene and supercritical CO2 to form a polypropylene-CO2 saturated system, bu...

Embodiment 2

[0055] The difference between this embodiment and Embodiment 1 is that an upper roll and a lower roll are arranged at the die outlet of the extrusion device 18, and the upper roll and the lower roll are coated with decorative surface materials, and the polypropylene foam board comes out of the mold Finally, use the waste heat to directly coat the decorative surface. Because the compatibilizer is added to the polypropylene, the composite of the polypropylene foam board and the decorative surface can be realized without glue, which is highly efficient, non-toxic and safe.

Embodiment 3

[0057] In the preparation process of polypropylene physical foam composite board, the reaction kettle includes a kettle body 1, a cover body 2, a stirring device, a feed port 3, a vent port 4 and a discharge port 5, and the cover body 2 is provided with The feeding port 3 and the ventilation port 4, the bottom of the kettle body 1 is provided with a discharge port 5, the discharge port 5 is provided with a discharge valve 20, and the interlayer of the kettle body 1 is provided with a heating element 6, The inside of the kettle body 1 is provided with a push plate 9, the diameter of the push plate 9 is smaller than the inner diameter of the kettle body 1, and the push plate 9 is rotatably connected with the push rod 8 and passes through the cover body 2 and the cylinder 7 connected, the stirring device includes a stirring motor 10, a stirring shaft and a stirring paddle 13, the stirring shaft includes an inner shaft 11 and an outer shaft 12, the inner shaft 11 and the outer shaf...

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Abstract

The invention discloses a preparation process of a polypropylene physical foaming composite board, and solves the problems of either low efficiency or poor performance of preparation of composite boards due to the fact that the existing gap type PP physical foaming method has low preparation efficiency, molten liquid obtained by continuous extrusion foaming and supercritical CO2 are not uniformlymixed and foaming performance is poor. The preparation process comprises the following steps: step 1, adding polypropylene particles to a reactor; step 2, introducing supercritical CO2; step 3, performing stirring to form saturated molten liquid; step 4, opening a discharge valve, opening an air cylinder to push a push plate to move downward and press the saturated molten liquid into an extrusiondevice, enabling a screw below a stirring shaft to enter a discharge port under drive of the push plate, and spirally extruding the saturated molten liquid at the discharge port. The preparation process has the advantages of semi-continuous extrusion, stable discharge, high production efficiency and the like.

Description

technical field [0001] The invention relates to the technical field of polypropylene foaming, in particular to a preparation process of a polypropylene physical foaming composite board. Background technique [0002] Polymer foaming material refers to a resin material with a large number of micropores inside the matrix. Compared with unfoamed materials, it has low density, high strength, stiffness and fatigue strength, and greatly prolongs fatigue life. It can be used as cushioning materials, insulating materials, energy storage Materials, catalysts and their carriers are widely used in the fields of aviation, automobiles and environmental protection. [0003] PP foaming materials are favored by people because of their advantages such as high service temperature, high impact strength, environmental friendliness and low cost. A few developed countries have mastered the mature technology of PP foaming and completed industrialization. Foaming methods can be divided into physica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C44/34B29C44/36B29C44/52B29B7/16B29B7/26B29K23/00
CPCB29B7/16B29B7/26B29C44/3442B29C44/36B29C44/52B29K2023/12
Inventor 张媛周皓
Owner CHONGQING VOCATIONAL INST OF ENG
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