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Thermoplastic polyurethane foaming bead particle and preparation method thereof

A thermoplastic polyurethane and foaming bead technology, which is applied in the field of new materials, can solve the problems of increasing post-processing steps-separation and drying, difficulty in obtaining high-rate foaming beads, and long heating time for materials. The effect of fast core speed and high foaming ratio

Active Publication Date: 2018-09-07
常州晟润新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the common autoclave impregnation method also has some problems. Due to the poor thermal conductivity of the material, in order to achieve a uniform temperature of the material in the autoclave, it is usually necessary to add a dispersant-suspension (mainly water), which causes the material to be heated. Long time, high energy consumption, increased post-treatment process - separation and drying, reducing production efficiency
Usually, when the high-pressure reactor impregnation method is used to prepare elastomer foam beads, it is often difficult to obtain high-magnification foam beads. At the same time, with the increase of foam ratio, the cell diameter increases and the mechanical properties decrease.

Method used

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  • Thermoplastic polyurethane foaming bead particle and preparation method thereof
  • Thermoplastic polyurethane foaming bead particle and preparation method thereof
  • Thermoplastic polyurethane foaming bead particle and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation method of polyurethane foam beads is as follows:

[0027] (1) Select 100 parts of foaming grade polyether thermoplastic polyurethane (designation HF4080A), the resin MVR is 40ml / 10min (5kg weight at 200°C), melt and extrude through a single-screw extruder, and granulate into 100 grains. 2.9±0.1g of resin particles to be expanded are dried for later use.

[0028] (2) Heat the granules to be expanded to above 135°C within 15 minutes through the screw conveying heating equipment, and transport them to the high-pressure reactor. The high-pressure reactor is kept at a constant temperature of 155°C. The pressure is 12MPa, and the pressure is maintained for 45 minutes.

[0029] (3) First release the pressure of the supercritical fluid in the kettle to 7MPa, control the pressure relief rate to 120MPa / s, and keep the pressure for 90s; then, release the pressure of the supercritical fluid in the kettle to 0, and control the pressure relief rate to 50MPa / s, Produ...

Embodiment 2

[0032] The preparation method of polyurethane foam beads is as follows:

[0033] (1) Select 60 parts of foaming-grade polyether-type thermoplastic polyurethane (brand HF4080A), 40 parts of foaming-grade polyester-type thermoplastic polyurethane (brand HF3085A), and the MVR of both resins is 40ml / 10min (5kg weight at 200°C) ), melted and extruded by a single-screw extruder, granulated into resin particles to be expanded with a weight of 3.8 ± 0.1g, and dried for subsequent use.

[0034] (2) Heat the particles to be expanded to above 115°C within 15 minutes through the screw conveying heating equipment, and transfer them to the high-pressure reactor. The high-pressure reactor is kept at a constant temperature of 135°C. The pressure is 8MPa, and the pressure is maintained for 45 minutes.

[0035] (3) First, the supercritical fluid in the kettle is depressurized to 7MPa, and the pressure relief rate is controlled to be 50MPa / s, and the pressure is maintained for 180s; then, the s...

Embodiment 3

[0038] The preparation method of polyurethane foam beads is as follows:

[0039] (1) Select 100 parts of foaming grade polyether thermoplastic polyurethane (brand name HF4080F), resin MVR is 20ml / 10min (5kg weight at 200°C), melt and extrude through a single-screw extruder, and granulate into 100-grain weight 3.2±0.1g of resin particles to be expanded are dried for later use.

[0040] (2) Use special screw-type heat-soaking equipment to heat the desired particles to above 115°C within 10 minutes, and transport them to the high-pressure reactor. The high-pressure reactor is kept at a constant temperature of 135°C. The pressure is 10MPa, and the pressure is maintained for 15 minutes.

[0041](3) First, the supercritical fluid in the kettle is depressurized to 7MPa, and the pressure relief rate is controlled to be 120MPa / s, and the pressure is maintained for 90s; then, the supercritical fluid in the kettle is depressurized to 0, and the pressure relief rate is controlled to be 5...

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Abstract

The invention discloses a thermoplastic polyurethane foaming bead particle and a preparation method thereof. The preparation method comprises the following steps of (1) extruding a foaming-level thermoplastic polyurethane resin composition, and granulating, so as to form the to-be-foamed particles with uniform shape and weight; (2) uniformly heating the to-be-foamed particles by screw conveying heating equipment to approximate the foaming temperature, conveying into a constant-temperature high-pressure reaction kettle, filling supercritical fluid, permeating and swelling to reach dispersion balance, so as to form a polymer-supercritical fluid homogeneous system; (3) controlling the pressure release speed in the system, and foaming and swelling the to-be-foamed particles, so as to form thefoaming bead particle with special structure. The preparation method has the advantages that the production process is clean and environmentally friendly, the efficiency is higher, the prepared foaming bead particle has light specific weight and high mechanical property, and the thermoplastic polyurethane foaming bead particle can be applied to the fields of package, shoes, sports articles and thelike.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a thermoplastic polyurethane foamed bead and a preparation method thereof. Background technique [0002] Traditional foamed beads such as expandable polystyrene (EPS), expandable polyethylene (EPE), expandable polyolefin (EPO), etc., can no longer meet the needs of high-performance fields due to their low heat resistance. application, and the traditional foaming process often uses organic solvents, chlorofluorocarbons and other foaming agents, which seriously pollute the environment and products. [0003] Supercritical fluid foaming technology, the foaming process is clean, and will not pollute the environment and foamed products. Therefore, supercritical fluid foaming technology has attracted more and more attention from the society. The viscosity and diffusion coefficient of supercritical fluid (SCF, supercritical fluid) are close to gas, while the density an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/18C08J9/12B29B13/02C08L75/08C08L75/06
CPCB29B13/02C08J9/122C08J9/18C08J2203/06C08J2203/08C08J2205/048C08J2375/08C08J2475/06
Inventor 李巍徐强顾唯开于民栋
Owner 常州晟润新材料科技有限公司
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