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A polymer particle integrated foam molding process

A foam molding and polymer technology, applied in the field of polymer foam material preparation, can solve problems such as uneven distribution of molds, adhesion of foamed particles, etc., to solve the problem of poor welding, consistent particle temperature, and uniform internal welding. Effect

Active Publication Date: 2021-11-02
SHINCELL NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects that the foamed particles in the prior art will stick together in advance and be unevenly distributed in the mold, thereby providing an integrated foaming molding process of polymer particles

Method used

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  • A polymer particle integrated foam molding process
  • A polymer particle integrated foam molding process
  • A polymer particle integrated foam molding process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This embodiment provides a foam pretreatment device and a foam molding device.

[0037] Such as figure 1 Said, a foaming pretreatment device, wherein, the first extruder 101 and the second extruder 102 are twin-screw extruders, the outlets of which are respectively connected to the two feeding ports of the distributor 103, and the distribution A die head 104 is installed at the outlet of the device 103 and is connected with an underwater hot cutting granulation system 105 .

[0038] Such as figure 2 As shown, a foam molding device, wherein the upper mold 207 and the lower mold 209 are respectively installed on the upper hot plate 206 and the lower hot plate 210 of the hydraulic press, and are sealed by the sealing ring 208 through the hydraulic press. The steel cylinder 201 and the booster pump 204 are connected by a pipeline, and a steel cylinder intake valve 202 is installed on the pipeline between the two; the booster pump 204 and the air inlet 212 on the lower mo...

Embodiment 2

[0040] This embodiment provides an integrated foam molding process for polymer particles, wherein the material to be foamed is polypropylene resin (PP), comprising the following steps:

[0041](1) Add polypropylene resin (PP) with a number average molecular weight of 200,000 and a melting point of 160°C to the first extruder 101, and add PP with a number average molecular weight of 100,000 and a melting point of 140°C to the second extruder 102 Inside, the mass ratio of the two resins is 5:1, which are respectively melted by the screw in the extruder, and then extruded into the distributor 103. In the distributor 103, the PP with a melting point of 140°C is packaged with the PP with a melting point of 160°C. After that, it is extruded from the die head 104, and hot-cut and granulated in the underwater hot-cut granulation system 105. The granulation temperature is 80°C, and the polymerization of PP with a melting point of 160°C in the core and PP with a melting point of 140°C in...

Embodiment 3

[0044] This embodiment provides an integrated foam molding process for polymer particles, wherein the material to be foamed is polyether polyurethane elastomer (TPU), comprising the following steps:

[0045] (1) Add polyether polyurethane elastomer (TPU) with a number average molecular weight of 250,000 and a melting point of 153°C into the first extruder 101, and add TPU with a number average molecular weight of 170,000 and a melting point of 138°C into the second extruder In the extruder 102, the mass ratio of the two resins is 25:1. They are respectively melted by the screw in the extruder, and then extruded into the distributor 103. In the distributor 103, the ratio of TPU with a melting point of 138 ° C to that of TPU with a melting point of 153 ° C is realized. The coating of TPU is then extruded from the die head 104, and then hot-cut and granulated in the underwater hot-cut granulation system 105. The granulation temperature is 60°C, and the TPU with the melting point o...

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Abstract

The invention discloses an integrated foam molding process of polymer particles, which comprises the following steps: 1) preparing polymer particles coated with high melting point polymer resin by low melting point polymer resin; 2) foaming the polymer particles in one step Foam molding to obtain foamed products. The present invention prepares polymer particles with a core-shell structure coated with a low-melting-point high-molecular resin. During the foaming process, the foaming temperature is below the melting point of the core resin, so that the particle core can form foaming. Beads, and the foaming temperature is higher than the melting point of the shell resin, the surface is in a molten state, when the particles expand and squeeze each other, the shell resin in the molten state makes the particles weld together; at the same time, the particles are in the foaming process. In the fluidized state, all the particles have the same temperature to ensure that the particles will not be bonded in advance, and the internal welding is uniform when expansion occurs, so as to avoid filling defects.

Description

technical field [0001] The invention relates to the technical field of polymer foam material preparation, in particular to an integrated foam molding process of polymer particles. Background technique [0002] Using foaming technology to form a large number of bubbles inside the polymer material to form a polymer foam material with a porous structure is an effective means to achieve lightweight products and save materials. The existence of a large number of cells also endows the material with excellent thermal insulation, damping and buffering, noise reduction and sound absorption and other characteristics. Generally speaking, the higher the expansion ratio of the polymer foam material, the lighter the weight of the product, the more material is saved, and the better the performance of heat insulation and cushioning. Common high-magnification foaming products often have complex shapes and structures. However, there is currently no effective one-step foaming technology in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C44/34B29B9/12
CPCB29B9/12B29C44/3438
Inventor 张磊
Owner SHINCELL NEW MATERIAL CO LTD
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