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A kind of preparation method of TPU expanded beads and product thereof

A technology for foaming beads and particles, applied in the field of thermoplastic polyurethane elastomer foam materials, can solve the problems of unstable density of TPU foam beads, uneven cell size, low production efficiency, etc. Achieve the effect of reducing equipment investment, improving performance and high production efficiency

Active Publication Date: 2022-04-19
MIRACLL CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is that the density of TPU foamed beads in the current TPU foamed beads production technology is unstable, the cell size is uneven, the equipment investment is high, the space is large, and the production efficiency is low.

Method used

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  • A kind of preparation method of TPU expanded beads and product thereof
  • A kind of preparation method of TPU expanded beads and product thereof
  • A kind of preparation method of TPU expanded beads and product thereof

Examples

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preparation example Construction

[0054] The technological process and system of the preparation method of TPU expanded beads of the present invention are as figure 1 shown, including steps:

[0055] (1) Continuously add the TPU particles 1 and water 2 into the reaction kettle 3 after metering respectively, and stir to form a uniform suspension;

[0056] (2) Measure above-mentioned suspension and foaming agent 6 respectively, and transport to three-way mixing valve 8 to form mixture in pipeline 5,16 by pump 4,7 respectively; , flow valve 19, flow indicator controller 20 for metering control;

[0057] (3) above-mentioned mixture is delivered in the heat exchanger 9, be warmed up to foaming temperature;

[0058] (4) The mixture that reaches the foaming temperature is transported to the multi-stage impregnation container 11 through the pipeline 10, and the foaming agent is gradually impregnated into the inside of the TPU particles, and finally reaches the dissolution balance;

[0059] The multi-stage immersion...

Embodiment 1

[0065] A preparation method of TPU foam beads, comprising the steps of:

[0066] (1) Measure the polyether-type TPU particles 1 and water 2 with a Shore hardness of 75A and a Tm of 160°C through a weight-loss feeding system and a liquid flow meter, respectively, and control the mass ratio of polyether-type TPU particles 1 and water 2 to 1:1, and then continuously added to the 200L reactor 3, and set the stirring speed of the reactor to 45Hz, so that the above TPU particles and water form a uniform suspension;

[0067] (2) The above-mentioned suspension is transported to the three-way mixing valve 8 through the pipeline 5 according to the mass flow rate of 150g / s by the pump 4, and the foaming agent carbon dioxide 6 is transported to the three-way mixing valve by the pump 7 according to the mass flow rate of 15g / s. Pass the mixing valve 8 and mix with the suspension to form a mixture;

[0068] (3) Transport the above-mentioned mixture to the heat exchanger 9 to raise the tempe...

Embodiment 2

[0073] A preparation method of TPU foam beads, comprising the steps of:

[0074] (1) Measure the polyester TPU particles 1 and water 2 with a Shore hardness of 95A and a Tm of 200°C through a weight-loss feeding system and a liquid flow meter, respectively, and control the mass ratio of polyester TPU particles 1 and water 2 to 1:5, and then continuously added to the 200L reactor 3, and set the stirring speed of the reactor to 45Hz, so that the above-mentioned TPU particles and water form a uniform suspension;

[0075] (2) The above-mentioned suspension is transported to the three-way mixing valve 8 through the pipeline 5 according to the mass flow rate of 1500g / s by the pump 4, and the blowing agent nitrogen 6 is transported to the three-way mixing valve by the pump 7 according to the mass flow rate of 125g / s. Pass the mixing valve 8 and mix with the suspension to form a mixture;

[0076] (3) Transport the above-mentioned mixture to the heat exchanger 9 to raise the temperatu...

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Abstract

The invention discloses a preparation method of TPU foam beads and products thereof. The preparation method comprises steps: (1) respectively metering the TPU particles and water into the reaction kettle continuously, and stirring to form a uniform suspension; (2) separately metering the above suspension and foaming agent, respectively The mixture is transported to the mixing place by a pump; (3) the above-mentioned mixture is transported to a heat exchanger, and the temperature is raised to the foaming temperature; (4) the mixture reaching the foaming temperature is transported to a multi-stage immersion vessel through a pipeline, and foamed The agent is gradually impregnated into the inside of the TPU particles, and finally reaches the dissolution equilibrium; (5) the TPU particles with the foaming agent dissolution balance are continuously discharged into the receiving tank through the orifice plate at the end of the pipeline connected to the outlet of the multi-stage impregnation container for foaming, and the foaming agent is obtained. TPU foam beads. The density of the TPU foamed beads is 0.1~0.3g / cm 3 , the difference between the largest size and the smallest size of the cell is not more than 20 μm.

Description

technical field [0001] The invention relates to the technical field of thermoplastic polyurethane elastomer foaming materials, in particular to a preparation method of TPU foaming beads and a product thereof. Background technique [0002] Polymer foam materials are usually based on plastic, rubber or thermoplastic elastomer, and a large number of bubbles are formed inside the matrix material by physical or chemical methods. It has a series of advantages such as low density, heat insulation, high specific strength, and cushioning. It has a wide range of applications in packaging, industry, agriculture, transportation, military industry, aerospace industry and daily necessities. Thermoplastic polyurethane elastomer (TPU for short) has a wide range of hardness, excellent wear resistance, mechanical strength, water resistance, oil resistance, chemical corrosion resistance, mold resistance, environmental friendliness, and recyclability. Molded foam products can be obtained by fi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C44/34B29C35/02B29C44/60C08J9/12C08J9/14C08J9/18C08J9/228
CPCB29C44/3415B29C44/3442B29C44/34B29C44/60B29C35/02C08J9/18C08J9/228C08J9/122C08J9/141C08J2375/08C08J2375/06C08J2375/04C08J2203/06C08J2203/14
Inventor 王光阜张生宋红玮杨冲冲王仁鸿
Owner MIRACLL CHEM
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