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Integrated foaming molding process for polymer particles

A foam molding and polymer technology, applied in the field of polymer foam material preparation, can solve the problems of foamed particles sticking, uneven distribution of molds, etc., achieve uniform particle temperature, solve the problem of poor welding, and easy to achieve.

Active Publication Date: 2019-08-16
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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  • Integrated foaming molding process for polymer particles
  • Integrated foaming molding process for polymer particles
  • Integrated foaming molding process for polymer particles

Examples

Experimental program
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Effect test

Embodiment 1

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

[0037] like figure 1 As described above, a foaming pretreatment device, wherein the first extruder 101 and the second extruder 102 are both twin-screw extruders, and their outlets 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] like 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 the cylinder intake valve 202 is installed on the pipeline between the two; the booster pump 204 and the air inlet 212 on the low...

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 foaming molding process for polymer particles. The method comprises the following steps of (1) preparing polymer particles with high-melting-point macromolecule resin coated by low-melting-point macromolecule resin; and (2) carrying out one-step foaming molding on the polymer particles to obtain a foamed product. The polymer particles with the high-melting-point macromolecule resin coated by the low-melting-point macromolecule resin and of a core-shell structure is prepared, in the foaming process, the foaming temperature is below the melting point of thecore resin, so that the core of the particles can form foaming beads, the foaming temperature is higher than the melting point of the shell resin, the surface is in a molten state, and when the particles are expanded and mutually extruded, the shell resin in the molten state enables the particles to be welded together; meanwhile, the particles are in a fluidized state in the foaming process, the temperatures of all the particles are consistent, the particles are ensured not to be bonded in advance, the internal welding is uniform and consistent when expansion occurs, and filling defects are avoided.

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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IPC IPC(8): B29C44/34B29B9/12
CPCB29B9/12B29C44/3438
Inventor 张磊
Owner SHINCELL NEW MATERIAL CO LTD
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