High-hardness thermoplastic polyurethane foaming coiled material and semi-continuous preparation method thereof

A thermoplastic polyurethane, high-hardness technology, applied in the field of new polyurethane, can solve the problems of difficult to effectively control the cell size, easy to escape, damage to the surface quality of the foamed material of the extruded foamed TPU material cell shape, etc., to achieve large-scale Continuous production, stable continuous temperature rise and foaming, the effect of suppressing the desorption phenomenon

Active Publication Date: 2022-05-10
ZHEJIANG HUANLONG NEW MATERIAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of continuous extrusion foaming, there is a problem that high-pressure fluid is easy to escape at high temperature, which leads to the problems of large cell size, wide cell size distribution, open cell structure and difficult to effectively control the cell size of the foamed material. At the same time, , the skin of the foamed material has defects such as air lines and waves
High-hardness TPU melt processing is very difficult. When using supercritical fluid to continuously extrude high-hardness TPU foam materials, higher requirements are placed on the torque of the extrusion equipment and the accuracy of temperature control in different regions, which makes the processing difficult and will also Further damage the cell morphology of the extruded foamed TPU material and the surface quality of the foamed material

Method used

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  • High-hardness thermoplastic polyurethane foaming coiled material and semi-continuous preparation method thereof
  • High-hardness thermoplastic polyurethane foaming coiled material and semi-continuous preparation method thereof
  • High-hardness thermoplastic polyurethane foaming coiled material and semi-continuous preparation method thereof

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Embodiment 1

[0039] An embodiment of the high-hardness thermoplastic polyurethane foaming coil described in the present invention, the preparation method of the high-hardness thermoplastic polyurethane foaming coil described in this embodiment is as follows:

[0040] (1) After 100 parts of high-hardness thermoplastic polyurethane 1, 3 parts of lubricant and 0.3 part of antioxidant are sequentially dried, pre-mixed, twin-screw continuous extrusion, calendered and rolled, a precursor thermoplastic polyurethane roll with a thickness of 3mm is obtained material; the temperature of the extruder from the feeding port to the fourth temperature zone is set to 199°C, 204°C, 210°C, 215°C, and 216°C in sequence, and the temperature of the calender is controlled by 10°C circulating water, and the roller distance is 1.4mm. The temperature of the die head of the extruder is 213±0.2°C, and the temperature is controlled separately by heat conduction oil.

[0041] (2) Put the precursor thermoplastic polyur...

Embodiment 2～4

[0045] The embodiment of the high-hardness thermoplastic polyurethane foaming coil of the present invention, the difference between embodiment 2-4 and embodiment 1 is only that the high-hardness thermoplastic polyurethane used is different, respectively high-hardness thermoplastic polyurethane 2-4, the fourth The temperatures in the temperature zones are 215°C, 216°C, and 218°C, respectively, and the die head temperatures of the extruder are 213±0.2°C, 214±0.2°C, and 216±0.2°C, respectively, and the heat transfer oil is used to control the temperature separately.

Embodiment 5

[0047] The embodiment of the high-hardness thermoplastic polyurethane foam coil in the present invention, the difference between this embodiment and the embodiment 1 is that it is stored at a low temperature of -18° C. and then stored at a low temperature of 0° C. for 6 hours.

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Abstract

The invention discloses a high-hardness thermoplastic polyurethane foaming coiled material and a preparation method thereof, and relates to the technical field of novel polyurethane. The semi-continuous preparation method of the high-hardness thermoplastic polyurethane foaming coiled material comprises the following steps: (1) uniformly mixing high-hardness thermoplastic polyurethane, low-hardness thermoplastic polyurethane (if any) and an auxiliary agent, and carrying out melt extrusion, calendering and rolling to obtain a precursor thermoplastic polyurethane coiled material; (2) dipping the precursor thermoplastic polyurethane coiled material in a high-pressure fluid, and carrying out low-temperature gas locking and low-temperature storage; and (3) heating, foaming, cooling and rolling to obtain the high-hardness thermoplastic polyurethane foamed coiled material. The hardness of the high-hardness thermoplastic polyurethane is 55-90 HD, and the flowing point of the high-hardness thermoplastic polyurethane is 190-208 DEG C; the hardness of the low-hardness thermoplastic polyurethane is less than 55 HD; the thickness of the precursor thermoplastic polyurethane coiled material ranges from 0.5 mm to 3 mm. The thermoplastic polyurethane foaming coiled material prepared by the method disclosed by the invention not only has higher hardness, but also has a good foam structure.

Description

technical field [0001] The invention relates to the technical field of novel polyurethane, in particular to a high-hardness thermoplastic polyurethane foaming coil and a preparation method thereof. Background technique [0002] Soft elastomer foam materials such as ethylene vinyl acetate (EVA) foam, polyurethane (PU) foam, polyvinyl chloride (PVC) foam, silicon foam, rubber foam, etc. have light weight, soft texture, good toughness, and high resilience. The advantages of elastic and compressible rebound have been widely used in sports protection, foam leather, heat insulation, sound absorption, cushioning packaging, shock absorption and other fields. PU elastomer micro-foaming material has excellent shock absorption, fatigue resistance, and low compression set performance, and has been used in the fields of high-speed rail shock pads and other fields. High-hardness elastomer foam materials such as PU elastomer hard foam have excellent wear resistance and low compression set...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/12C08L75/04C08K5/09C08K5/134
CPCC08J9/122C08J9/0061C08J9/0023C08J2203/06C08J2375/04C08J2475/04
Inventor 翟文涛
Owner ZHEJIANG HUANLONG NEW MATERIAL SCI & TECH
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