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Microcellular foam thermoplastic polyurethane material and preparation method thereof

A thermoplastic polyurethane and microcellular foaming technology, which is applied in the field of polymer foaming material preparation, can solve the problems of accelerating product aging speed, affecting product precision, product rupture, etc., achieving adjustable elastic strength, ensuring uniformity of pressure, The effect of good cushioning performance

Active Publication Date: 2016-07-13
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, chemical foaming technology is mostly used to prepare thermoplastic polyurethane porous materials. During the preparation process, a large amount of reaction products will be generated during the chemical reaction and stay inside the product, which will accelerate the aging speed of the product and reduce its service life; at the same time, the chemical The gas generated by the reaction will be released into the atmosphere after the foaming is completed, causing pollution to the environment; at the same time, the production efficiency of

Method used

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  • Microcellular foam thermoplastic polyurethane material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment provides a method for preparing a microcellular foamed thermoplastic polyurethane material, and the specific steps include:

[0032] (1) Use an injection molding machine to heat-melt 1000g of thermoplastic polyurethane granules to obtain a thermoplastic polyurethane sol; control the temperature of the barrel of the injection molding machine from the side of the hopper to the position of the nozzle to gradually rise in the temperature range of 160°C to 220°C High, so that the temperature of thermoplastic polyurethane particles rises steadily to achieve the purpose of uniform plasticization.

[0033] (2) Continuously introduce carbon dioxide supercritical foaming gas with a gas pressure of 4MPa into the thermoplastic polyurethane sol at a gas introduction speed of 40ccm / s for a duration of 2s, and use the injection molding machine for mixing to obtain a mixed gas Sol.

[0034] (3) When the temperature of the controllable molding mold is 20°C, inject the m...

Embodiment 2

[0037] This embodiment provides a method for preparing a microcellular foamed thermoplastic polyurethane material, and the specific steps include:

[0038](1) Use an injection molding machine to heat-melt 1000g of thermoplastic polyurethane particles to obtain a thermoplastic polyurethane sol; control the temperature of the barrel of the injection molding machine from the side of the hopper to the position of the nozzle to gradually rise in the temperature range of 180°C~220°C High, so that the temperature of thermoplastic polyurethane particles rises steadily to achieve the purpose of uniform plasticization.

[0039] (2) Continuously introduce nitrogen supercritical foaming gas with a gas pressure of 15MPa into the thermoplastic polyurethane sol at a gas introduction speed of 80ccm / s for a duration of 1s, and use the injection molding machine for mixing to obtain a mixed gas Sol.

[0040] (3) When the temperature of the controllable molding mold is 65°C, the mass of the mixe...

Embodiment 3

[0043] This embodiment provides a method for preparing a microcellular foamed thermoplastic polyurethane material, and the specific steps include:

[0044] (1) Use an injection molding machine to heat-melt 1000g of thermoplastic polyurethane particles to obtain a thermoplastic polyurethane sol; control the temperature of the barrel of the injection molding machine from the side of the hopper to the position of the nozzle to gradually rise in the temperature range of 160°C~210°C High, so that the temperature of thermoplastic polyurethane particles rises steadily to achieve the purpose of uniform plasticization.

[0045] (2) Continuously introduce a supercritical foaming gas composed of a mixture of carbon dioxide and nitrogen at a gas pressure of 23MPa into the thermoplastic polyurethane sol at a gas introduction rate of 50ccm / s for a duration of 0.5s, and use the injection molding machine to carry out Mixing to obtain a mixed aerosol.

[0046] (3) Control the temperature of t...

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Abstract

The invention provides a microcellular foam thermoplastic polyurethane material and a preparation method thereof. The method includes the steps of: firstly subjecting thermoplastic polyurethane particles to hot melting to obtain a thermoplastic polyurethane sol, then conducting mixing on the thermoplastic polyurethane sol and a supercritical foaming gas to form a mixed sol; and finally using a mold pressure controllable molding die to perform injection moulding treatment on the mixed gas sol so as to obtain the microcellular foam thermoplastic polyurethane material. The microcellular foam thermoplastic polyurethane material provided by the invention has the characteristics of environment-friendly and pollution-free preparation method, short and efficient preparation process, low preparation cost, high foam expansion and no chemical residue, high elastic strength and good cushioning performance.

Description

technical field [0001] The invention relates to the technical field of polymer foaming material preparation, in particular to a microcellular foaming thermoplastic polyurethane material and a preparation method thereof. Background technique [0002] Thermoplastic polyurethane is a new type of high molecular polymer material. Due to its good mechanical strength, it can be widely used in molding methods such as injection, calendering and dissolving into solution resin. At the same time, the thermoplastic polyurethane porous material prepared from thermoplastic polyurethane has excellent wear resistance, excellent ozone resistance, high hardness, high strength, good elasticity, low temperature resistance, good oil resistance and chemical resistance, and is widely used in Aerospace, car interior, sporting goods and medical equipment and other fields. [0003] At present, chemical foaming technology is mostly used to prepare thermoplastic polyurethane porous materials. During th...

Claims

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Application Information

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IPC IPC(8): B29C45/77B29C45/78C08J9/12
CPCB29C45/77B29C45/78B29C2945/76498B29C2945/76531C08J9/122C08J2203/06C08J2375/04
Inventor 王心超刘春太董斌斌韩健张娜曹伟王小峰申长雨
Owner ZHENGZHOU UNIV
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