A kind of preparation method of high elastic thermoplastic polyurethane foamed particles and molded body

A thermoplastic polyurethane and foamed particle technology, applied in the field of preparation of thermoplastic polyurethane foamed particles, can solve the problems of restricting large-scale preparation of foamed materials, high saturation pressure and temperature pressure relief rate, etc., and achieves easy industrial production, shrinkage rate and the like. Low, simple and easy-to-use effect

Active Publication Date: 2019-06-28
MAOTAI FUJIAN SOLES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN 103642200 A has reported the method for preparing foamed thermoplastic polyurethane beads by adopting the rapid pressure relief method of high-pressure reactor, but the rapid pressure relief method generally needs higher saturation pressure and temperature and a very high pressure relief rate, which is harmful to pressure vessels, stirring There are high requirements for pressure relief valves and pressure relief valves, which limit the industrialization of large-scale preparation of foaming materials by rapid pressure relief methods.

Method used

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  • A kind of preparation method of high elastic thermoplastic polyurethane foamed particles and molded body
  • A kind of preparation method of high elastic thermoplastic polyurethane foamed particles and molded body
  • A kind of preparation method of high elastic thermoplastic polyurethane foamed particles and molded body

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Effect test

Embodiment 1

[0033] In the present embodiment, thermoplastic polyurethane selects German BASF Elastollan® polyurethane TPU 1185 A10, and the preparation method of this thermoplastic polyurethane expanded particle comprises the following steps:

[0034] (1) Inject thermoplastic polyurethane particles (BASF TPU 1185 A10, Germany) into a single screw, and melt-extrude to prepare thermoplastic polyurethane particles with a diameter of 1 mm and an aspect ratio of 2.0;

[0035] (2) Put the thermoplastic polyurethane particles into the autoclave, and feed the high-pressure mixed fluid formed by mixing CO2 and chloroform at a pressure of 5.0MPa, so that the high-pressure mixed fluid reaches saturation in the thermoplastic polyurethane particles, and the saturation temperature is 70°C. obtain saturated thermoplastic polyurethane particles;

[0036] (3) Put the saturated thermoplastic polyurethane particles into a continuous hot air channel at a temperature of 185° C. to foam for 120 seconds to obta...

Embodiment 2

[0041] In the present embodiment, thermoplastic polyurethane selects German BASF Elastollan® polyurethane TPU 1185 A10, and the preparation method of this thermoplastic polyurethane expanded particle is basically the same as the preparation method in embodiment 1, and difference is:

[0042] In step (2), the pressure of the high-pressure mixed fluid is 9.0MPa, and the saturation temperature is 50°C;

[0043] In step (3), the saturated thermoplastic polyurethane particles are placed in a continuous hot air channel at a temperature of 160° C. for foaming for 180 seconds to obtain thermoplastic polyurethane micro-foamed particles.

[0044] The thermoplastic polyurethane micro-expanded particles have a 100% closed-cell structure, and the cell size is 130-170 μm. The density of the thermoplastic polyurethane microcellular particles is 0.163 / cm3.

[0045] The above foamed thermoplastic polyurethane particles were molded and manufactured, the specific process was the same as that in...

Embodiment 3

[0048] In the present embodiment, thermoplastic polyurethane selects German BASF Elastollan® polyurethane TPU 1185 A10, and the preparation method of this thermoplastic polyurethane expanded particle is basically the same as the preparation method in embodiment 1, and difference is:

[0049] In step (2), the pressure of the high-pressure mixed fluid is 0.5MPa, and the saturation temperature is 170°C;

[0050] In step (3), the saturated thermoplastic polyurethane particles are placed in a continuous hot air channel at a temperature of 220° C. for foaming for 40 seconds to obtain thermoplastic polyurethane micro-foamed particles.

[0051] The thermoplastic polyurethane micro-foamed particles have a 100% closed-cell structure, and the cell size is 120-170 μm. The thermoplastic polyurethane microcellular particles had a density of 0.183 g / cm3.

[0052] The above foamed thermoplastic polyurethane particles were molded and manufactured, the specific process was the same as that in ...

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Abstract

The invention discloses a method for preparing high-resilience thermoplastic polyurethane foamed particles and a molded body thereof. Thermoplastic polyurethane particles are placed in an autoclave, injected high-pressure mixed fluid is one or two of CO2, N2, HFC and HCFC, one or two of chloroform, ethanol, methanol, acetone, anone, butanone, pyridine, N-methyl pyrrolidone, N,N-dimethylformamide and N,N-dimethyl acetamide serve as an organic cosolvent, and the high-pressure mixed fluid is enabled to be in a saturated state in the thermoplastic polyurethane particles and then is placed in hot air for foaming, thereby obtaining the thermoplastic polyurethane foamed particles, of which foamed pore structures are uniform and are closed-pore structures. The thermoplastic polyurethane foamed particle molded body, which is light in weight, high in resilience and controllable in shape size and has good mechanical properties, can be obtained through injecting the thermoplastic polyurethane foamed particles in a mold and adjusting mold pressing temperature and pressure so as to soften heated surfaces of the foamed particles.

Description

technical field [0001] The invention relates to the technical field of preparation of polyurethane foaming materials, in particular to a method for preparing thermoplastic polyurethane foaming particles and a method for preparing foamed particle moldings by using the thermoplastic polyurethane foaming particles. Background technique [0002] Thermoplastic polyurethane (TPU) is a partially crystalline material and belongs to the category of thermoplastic elastomers. It has both the high elasticity of rubber and the molding processability of plastics. It has excellent comprehensive properties, especially high strength, good elasticity, and good environmental resistance. It is widely used in Automobile industry, shoe industry, packaging, construction and other fields. [0003] Moldable foam beads of thermoplastic polyurethane have been disclosed in WO2007082838. However, the reported foamed thermoplastic polyurethane beads have disadvantages such as large cell structure size, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/12C08L75/04
Inventor 卢鑫丁思博罗显发曾建伟金校红
Owner MAOTAI FUJIAN SOLES CO LTD
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