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Preparation method of thermoplastic polyurethane

A thermoplastic polyurethane and diisocyanate technology, applied in the field of thermoplastic polyurethane preparation, can solve problems such as complex thermoplastic polyurethane methods, and achieve the effects of eliminating quality fluctuation, simple and reliable preparation process, and satisfying the requirements of quality stability

Inactive Publication Date: 2013-09-04
ARCHITECTURAL ENG INST GENERAL LOGISTICS DEPT P L A
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the complex deficiency of the existing method for preparing thermoplastic polyurethane, the present invention provides a method for preparing thermoplastic polyurethane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: first 1000 kilograms of polytetrahydrofuran polyols, 517 kilograms of diphenylmethane diisocyanate and 99.7 kilograms of butanediol chain extenders are added to a reactor, such as a twin-screw reaction extruder, while adding an organotin catalyst 30ppm (relatively Polytetrahydrofuran polyol), after the reaction, it is directly extruded from the twin-screw to granulate.

[0013] According to the quality requirements of the product (melt index 3 ~ 5g / 10min), set the channel of the time-melt strength rheological curve, that is, set the curve of the product with a melt index of 3g / 10min as the upper limit, and set the product with a melt index of 5g / 10min This curve is set as the lower limit. In the production process, if the rheological curve formed by time and melt strength is lower than the lower limit, the screw speed is reduced from 170 rpm to 120 rpm to return the rheological curve to the channel.

Embodiment 2

[0014] Embodiment 2: first 500 kilograms of polytetrahydrofuran polyols, 275 kilograms of diphenylmethane diisocyanate and 49.9 kilograms of butanediol chain extenders are added to a reactor, such as a twin-screw reaction extruder, while adding an organotin catalyst 30ppm (relatively Polytetrahydrofuran polyol), after the reaction, it is directly extruded from the twin-screw to granulate.

[0015] According to the quality requirements of the product (melt index 16 ~ 18g / 10min), set the channel of the time-melt strength rheological curve, that is, set the upper limit of the curve for the product with a melt index of 16g / 10min, and set the product with a melt index of 18g / 10min This curve is set as the lower limit. In the production process, if the rheological curve formed by time and melt strength is lower than the lower limit, the amount of catalyst can be increased from 30ppm to 50ppm to make the rheological curve return to the channel.

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Abstract

The invention discloses a preparation method of thermoplastic polyurethane for solving the technical problem that existing methods for preparing thermoplastic polyurethane are complex. The technical scheme is as follows: the method comprises the following steps of: adding long-chain polyhydric alcohols, diisocyanate and a low molecular weight diol chain extender in percentage by weight into a reactor, and meanwhile, adding an organic metal compound catalyst according to quality of long-chain polyhydric alcohols; and after reaction, directly extruding and prilling from the reactor. Technical parameters are adjusted by change of flow curve formed by set temperature, time or pressure and torque, melt strength or viscosity, so that the flow curve returns to a permitted fluctuation range so as to realize higher stability of TPU molecular weight and distribution of TPU in the preparation process. Therefore, mixing treatment in the later stage is not required, and quality fluctuation of products in a same batch or different batches prepared by the existing preparation methods for preparing TPU is eliminated, so that the demand on the quality stability of TPU by downstream clients is met, and the preparation process is simple and reliable.

Description

technical field [0001] The invention relates to a method for preparing polyurethane, in particular to a method for preparing thermoplastic polyurethane. Background technique [0002] The instability of continuous production of thermoplastic polyurethane (hereinafter referred to as TPU) is a difficult problem in the industrial production of TPU. This kind of production instability is mainly manifested in different batches or even within the same batch. The molecular weight, flow point, melt index and processing temperature of TPU produced at different times fluctuate greatly, causing processing difficulties for downstream customers. [0003] The document "Patent Publication No. CN101050262A Chinese Invention Patent" discloses a thermoplastic polyurethane elastomer production process, which is characterized in that a homogenization silo is added after the drying and curing system, and different batches of TPU particles are blended and homogenized Reduce the difference in phys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/32C08G18/08
Inventor 李忠东马彦周长城王兆军
Owner ARCHITECTURAL ENG INST GENERAL LOGISTICS DEPT P L A
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