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Thermoplastic polyurethane (TPU based on polybutadiene soft chain segment) composite and its preparation method

A technology of thermoplastic polyurethane and composition, which is applied in the field of manufacturing thermoplastic polyurethane materials, can solve the problems that the polymer is not tough enough to cut and accept mechanical performance tests, poor initial mechanical performance, etc.

Inactive Publication Date: 2000-03-01
BAYER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has been found that polyurethane cast from a mixture of MDI, polybutadiene diol and 1,4 butanediol according to the prepolymer method has very poor initial mechanical properties
Even after prolonged high-temperature post-cure (18h, 110°C), the polymer was not tough enough to be cut and tested for mechanical properties

Method used

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Examples

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preparation example Construction

[0007] The preparation of the polyolefin of the present invention involves reacting a chain transfer agent with a cyclic olefin in the presence of a catalyst to produce the desired polyolefin.

[0008] In particular, the polyolefin is hydroxyl-functionalized polybutadiene (HFPB), which is prepared by the "ring-opening metathesis polymerization" ("ROMP") method (Grubbs et al., US Patent 5,750,815).

[0009] The synthesis of HFPB requires a chain transfer agent (CTA), which acts to add functionalities (hydroxyl groups) to the polymer chain ends. The use of CTA depends on the type of ROMP catalyst used. In the present invention, the most preferred chain transfer agent is 1,4-diacetoxy-2-butene. Correspondingly, this chain transfer agent works only in combination with ruthenium-based metathesis catalysts and has a significant effect on the viscosity of polybutadiene diols.

[0010] In the present invention, preferred cyclic olefins are cyclobutene and cyclooctadiene, and the mos...

example 1

[0028] Preparation of 7.0% NCO prepolymer: commercially available materials PolyBD R45M (2501 g) and MDI (997.2) were used as raw materials, and stirred at 87° C. overnight. Subsequently, the prepolymer was reacted with 1,4-butanediol (252.5 g) at 90°C to extend the molecular chain, poured into molds, and cured at 90°C overnight. The generated polyurethane based on R45HT was placed in a melt index analyzer at 205° C. and measured under the condition of loading a 10 kg mass weight on the cylinder. The polyurethane did not flow, but coking occurred due to the presence of crosslinks in the polyurethane.

example 2

[0030]Preparation of 7.0% NCO prepolymer: HFPB (317.25 g) and MDI (130.50 g) were used as raw materials, and stirred at 87° C. overnight. Subsequently, the prepolymer (326.6 g) was reacted with 1,4-butanediol (23.4 g) at 90°C to extend the molecular chain, poured into a mold and cured at 90°C overnight. The resulting sample disc was soft and cheese-like. The mechanical properties of this material could not be determined. The polyurethane was placed in a melt index analyzer, and measured at 205°C under the condition of loading a 10kg mass weight on the cylinder. The polyurethane flows easily under the stated conditions (MFI=8 g / 10 min).

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PUM

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Abstract

A process for making a thermoplastic polyurethane material comprising the steps of casting an NCO-terminated prepolymer with 1,4-butanediol to form a casting composition; extruding the casting composition to form at least one strand of a polyurethane elastomer; pelletizing the at least one strand of said polyurethane elastomer to form at least one pellet; and processing the at least one pellet to form a thermoplastic article.

Description

Background of the invention [0001] Polyurethanes based on polybutadiene soft segments with a functionality of 2.0 are disclosed in Yokelson et al. (US Patent 5,589,543). However, Yokelson et al. do not disclose the use of polyurethane as a thermoplastic. Commercially available hydroxyl-terminated polybutadiene is used to formulate a variety of polyurethane resins and adhesives for casting. However, since these polybutadienes have a functionality greater than 2.0, they form thermoset polyurethane materials. Polyurethanes based on such polybutadiene cannot be processed as thermoplastics (extrusion or injection molding). Hydroxy-terminated polybutadiene having a functionality of 2.0 is disclosed in Chung et al. US Patent 5,247,023, Grubbs et al. US Patent 5,750,815, and Nubel et al. US Patents 5,512,635, 5,559,190, 5,519,101 and 5,403,904. However, this polybutadiene has not been used to make thermoplastic polyurethane materials. [0002] The polyurethane elastomer produced b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29B9/00C08G18/08C08G18/10C08G18/22C08G18/32C08G18/62C08G18/70
CPCC08G18/6204C08G18/10C08G18/0895C08G18/3206C08G18/70
Inventor R·P·泰勒J·C·陈K·W·海德E·H·荣松U·W·弗兰兹M·A·彼德斯
Owner BAYER CORP
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