Method for preparing easily-machined polyether type thermoplastic polyurethane elastomer

A thermoplastic polyurethane and polyether type technology is applied in the field of preparation of easy-to-process polyether thermoplastic polyurethane elastomers, which can solve the problems of low processing yield, cable bubbles, affecting the appearance of cables, etc., so as to reduce processing difficulty and absorb water. The effect of reducing the rate of water absorption and reducing the speed of water absorption

Inactive Publication Date: 2014-08-13
奥斯汀新材料(张家港)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Easy-to-process polyether-type thermoplastic polyurethane elastomer (TPU), used for extrusion processing of fire-fighting water pipes, pneumatic pipes, oil pressure pipes, cable sheaths, etc. At present, when domestic polyether-type TPU is processing extruded cables, polyether The existence of water in TPU and the carbon dioxide produced by the partial decomposition of the material during high-temperature extrusion processing will cause serious air bubbles to appear on the surface or inside of the cable, making it difficult to process normally, resulting in low processing yield and affecting the appearance of the cable. In severe cases, it will affect the later materials safety of use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In the reactor, add antioxidant 1010 accounting for 3‰ of polyether polyol quality, antioxidant 245 accounting for 2‰ of polyether polyol quality, stannous octoate accounting for 150ppm of polyether polyol quality, the number average molecular weight is 1000 PTHF polyether polyol, dehydration, stirring, melting and mixing at 85°C and -0.08~-0.1MPa vacuum for 6 hours, then put it into metering tank A, open metering tank A, stir and vacuumize to -0.085MPa, then stop the vacuum and Dry and fill with nitrogen to obtain component A for later use;

[0031] Melt diphenylmethane diisocyanate at 43.5°C and keep it warm for 4 hours, then vacuum pump it into metering tank B and fill it with dry nitrogen to obtain component B for use;

[0032] Melt 1,4-butanediol at 40°C and pump it into metering tank C with a vacuum pump, dehydrate at -0.08~-0.1MPa vacuum for 4 hours, then fill with dry nitrogen to obtain component C for use;

[0033] The three components A, B, and C are poured i...

Embodiment 2

[0036] In the reactor, add antioxidant 1010 accounting for 3‰ of polyether polyol quality, antioxidant 245 accounting for 2‰ of polyether polyol quality, stannous octoate accounting for 150ppm of polyether polyol quality, and the same number-average molecular weight as 1000 PTHF polyether polyol, dehydration, stirring, melting and mixing at 85°C and -0.08~-0.1MPa vacuum for 6 hours, then put it into metering tank A, open metering tank A, stir and vacuumize to -0.085MPa, then stop the vacuum and Dry and fill with nitrogen to obtain component A for later use;

[0037] Melt diphenylmethane diisocyanate at 43.5°C and keep it warm for 4 hours, then vacuum pump it into metering tank B and fill it with dry nitrogen to obtain component B for use;

[0038] Melt 1,4-butanediol at 40°C and pump it into metering tank C with vacuum, dehydrate at -0.08~-0.1MPa vacuum for 4 hours, and then fill with dry nitrogen to obtain component C for use;

[0039]The three components A, B, and C are pou...

Embodiment 3

[0042] In the reaction kettle, add antioxidant 1010 accounting for 3‰ of polyether polyol quality, antioxidant 245 accounting for 2‰ of polyether polyol quality, stannous octoate accounting for 150ppm of polyether polyol quality, and the number average molecular weight is 1000 PTHF polyether polyol, dehydrated, stirred, melted and mixed at 85°C and -0.08~-0.1MPa vacuum for 6 hours, then put it into metering tank A, open metering tank A to stir and vacuumize to -0.085MPa, then stop the vacuum And dry and fill with nitrogen to obtain component A for subsequent use;

[0043] Melt diphenylmethane diisocyanate at 43.5°C and keep it warm for 4 hours, then vacuum pump it into metering tank B and fill it with dry nitrogen to obtain component B for use;

[0044] Melt 1,4-butanediol at 40°C and pump it into metering tank C with vacuum, dehydrate at -0.08~-0.1MPa vacuum for 4 hours, and then fill with dry nitrogen to obtain component C for use;

[0045] The three components A, B, and C ...

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Abstract

The invention discloses a method for preparing easily-machined polyether type thermoplastic polyurethane elastomer (TPU). The method comprises the following steps: 1) adding polyether polyhydric alcohol, an antioxidant and a catalyst into a reaction kettle for fusion, mixing and dehydration for later use; 2) respectively filling three components, namely, the polyether polyhydric alcohol, a dihydric alcohol chain extender and diisocyanate into a double-screw rod extruder for reaction through a high-precision gear pump; and 3) respectively adding solid higher alkane wax and higher fatty amine into the double-screw rod extruder by using a high-precision loss-in-weight in the middle of the double-screw rod extruder, fusing and mixing with polyurethane elastomer melt, and chopping under water to obtain easily-machined polyether type thermoplastic polyurethane elastomer grains. By adopting the method disclosed by the invention, the drying requirement is lowered (a dehumidification drying machine is not needed) when the easily-machined polyether type thermoplastic polyurethane elastomer is subjected to extrusion machining, and the surface smoothness degree of the product and the product extrusion stability are improved.

Description

technical field [0001] The invention relates to a preparation method of a thermoplastic polyurethane elastomer, in particular to a preparation method of an easy-to-process polyether type thermoplastic polyurethane elastomer. Background technique [0002] Easy-to-process polyether-type thermoplastic polyurethane elastomer (TPU), used for extrusion processing of fire-fighting water pipes, pneumatic pipes, oil pressure pipes, cable sheaths, etc. At present, when domestic polyether-type TPU is processing extrusion cables, polyether The existence of water in TPU and the carbon dioxide produced by the partial decomposition of the material during high-temperature extrusion processing will cause serious air bubbles to appear on the surface or inside of the cable, making it difficult to process normally, resulting in a low rate of finished product and affecting the appearance of the cable. In severe cases, it will affect the later materials Safety of use. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/48C08L75/08C08L91/06
CPCC08G18/3206C08G18/4854C08G18/6674C08K5/1345C08L75/08C08L2203/202C08L2207/04C08L91/06
Inventor 汪泽恒杨廷廷艾玲陈海风
Owner 奥斯汀新材料(张家港)有限公司
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