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Continuous production process of thermoplastic polyurethane elastomer

A technology of thermoplastic polyurethane and production method, which is applied in the field of continuous production of two-stage extruder TPU, can solve the problem that the shear efficiency is not enough to completely prevent hard knots and gel particles, cannot meet the extrusion molding requirements, and the product uniformity is not enough and other problems, to achieve the effect of eliminating gelation phenomenon, good physical and mechanical properties, and improving heat energy utilization efficiency

Inactive Publication Date: 2007-08-22
烟台万华新材料科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional twin-screw extruder production equipment has some disadvantages while having the advantages mentioned above, mainly as follows: 1. This extrusion process is relatively simple, and the mixing and reaction are carried out at the same time, but in this way The homogeneity of the resulting product is not sufficient for many applications
2. The residence time of the material in the extruder is limited, so that some additives (especially inorganic solid additives) are not completely combined with the matrix, and they are extruded by the extruder when they reach better compatibility, which affects the Exercising the functions of additives
3. Although the kneading times of the traditional twin-screw reaction extruder can reach 7-15 times / s, or even higher, its shearing efficiency for the material is not enough to completely prevent the generation of hard knots and gel particles, and the obtained There will be some infusibles in the product during processing and molding, which cannot meet the requirements of extrusion molding
The design idea of ​​this extruder is novel, but it is specially designed for mica synthetic engineering materials. For the production of TPU, the design of this equipment is complicated, expensive, and the daily maintenance is also relatively cumbersome.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The production of embodiment 1, polyester type TPU 1570A

[0056] The polyester polyol stored in the mechanical tank, diisocyanate MDI (diphenylmethane diisocyanate) (storage temperature 43 ° C), chain extender BDO (1,4-butanediol) (storage temperature 60 ° C) , poured into the first extruder section of the two-stage extruder through the Bray pouring machine, the mixing head speed is 3600RPM, the temperature of the first heating zone of the first extruder section is controlled to 90°C, and the rest are heated The zone temperature is 170°C±5°C and the screw speed is controlled at 40Hz. The completely mixed and initially reacted materials are conveyed to the second extruder section of the double-stage extruder, and the control temperature of the second extruder section is: 180±5°C, 180±5°C, 175±5°C , 170±5℃, 170±5℃, 170±5℃, 170±5℃, 175±5℃, 170±5℃, 175±5℃, 180±5℃, 180±5℃, 185±5℃ . The screw control speed is 220RPM, and the granulation speed is 7. The product is dried a...

Embodiment 2

[0057] Embodiment 2, the production of polyether type TPU 8180A

[0058]The storage temperature of the polyether polyol PTMG (polyoxytetramethylene glycol, number average molecular weight 1000) stored in the mechanical tank is 90°C, the storage temperature of the diisocyanate MDI is 43°C, and the storage temperature of the chain extender BDO is 60°C. It is poured into the first extruder section of the double-stage extruder through the Bray pouring machine, the mixing head speed is 3600RPM, the temperature of the first heating zone of the first extruder section is controlled at 95°C, and the rest of the heating zones The temperature is 180±5°C, and the screw speed is controlled at 45Hz. The completely mixed and initially reacted materials are conveyed to the second extruder section of the two-stage extruder, and the control temperature of the second extruder section is 180±5°C, 180±5°C, 175±5°C, 170±5℃, 170±5℃, 170±5℃, 170±5℃, 175±5℃, 170±5℃, 175±5℃, 180±5℃, 180±5℃, 185±5℃. T...

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Abstract

The present invention is improved continuous production of thermoplastic polyurethane (TPU) elastomer in a double step extruder, and belongs to the field of polymer preparing technology. In the double step extruder comprising two connected extruders, polyol, chain expander and polyisocyanate are reacted to prepare TPU elastomer. The present invention has adjustable prolonged material detention period, and homogeneous product with excellent physical and mechanical performance.

Description

1. Technical field [0001] The invention relates to a two-stage extruder TPU continuous production method, in particular to the improvement of a TPU preparation machine-screw extruder, and belongs to the technical field of high molecular polymer preparation technology. 2. Background technology [0002] Thermoplastic polyurethane elastomer (TPU) is a kind of polyurethane product that can be plasticized by heating and can be dissolved by solvent. It also has excellent physical and mechanical properties and good processing performance, and is widely used in automotive parts, seals, medical appliances, cables, pipes, fire hoses, shoe materials and other fields. [0003] Thermoplastic polyurethane elastomers can be produced stepwise (eg by prepolymer metering process) or by simultaneous reaction of all components in one stage (eg by one-shot metering process). [0004] TPU can be produced continuously or discontinuously. The current method of continuous production of TPU is main...

Claims

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Application Information

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IPC IPC(8): C08G18/00B29C47/36B29C47/38B29C47/78B29B9/06B29B13/06B29C48/385B29C48/395B29C48/875
CPCB29C47/366B29C48/875B29C48/385
Inventor 王仁鸿傅桂华张生杨永清刘学栋赵玮王东青王淑静
Owner 烟台万华新材料科技有限公司
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