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A kind of preparation method of star polyurethane elastomer

A technology of polyurethane elastomer and body, applied in the field of polyurethane elastomer and its preparation, can solve the problems of low material strength and complicated synthesis process of star-shaped polyurethane, and achieve better mechanical properties, efficient and controllable synthesis, and short production cycle Effect

Active Publication Date: 2019-07-12
山西泰宝科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of complex star-shaped polyurethane synthesis process and low material strength, and firstly provide a star-shaped polyurethane elastomer

Method used

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  • A kind of preparation method of star polyurethane elastomer
  • A kind of preparation method of star polyurethane elastomer
  • A kind of preparation method of star polyurethane elastomer

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preparation example Construction

[0022] A preparation method of a star polyurethane elastomer, comprising the following two methods:

[0023] Bulk one-step method: Add macromolecular diols, small molecular polyols or macromolecular polyols (functionality > 2), and chain extenders into the reaction vessel, stir at 70-130°C for 0.5-3 hours, Add diisocyanate, continue to stir for 1-10min, pour it into a material tray, put it in an oven at 100-140℃ for vulcanization for 4-24h, make the polymerization reaction complete, cool down, take it out, and obtain a star-shaped polyurethane elastomer;

[0024] Bulk prepolymerization method: Add macromolecular diols, small molecular polyols or macromolecular polyols, and diisocyanate into the reaction vessel, stir at 70-130°C for 1-6h to make a prepolymer; then Stir the prepolymer at 70-120°C and add a chain extender, pour the solution into the prepared mold when it is viscous, and press and vulcanize at 110-130°C for 10-60 minutes when it is gelled; finally, put The obtain...

Embodiment 1

[0042] Add 98.5 parts of polypropylene glycol with a number average molecular weight of 1000, 0.3 parts of polypropylene ether triol with a number average molecular weight of 300, and 75 parts of diphenylmethane diisocyanate into a three-necked flask, slowly heat to 70°C and stir for 3 hours to prepare prepolymer. Then control the prepolymer at 70-75°C, add 18 parts of butanediol under stirring, pour the solution into the prepared mold when it is viscous, and mold it at 120°C for 40 minutes when it gels. Finally, the obtained sample was placed in an oven at 110°C for post-curing for 20 hours. The tensile strength of the star polyurethane elastomer is 28.1MPa, and the elongation at break is 496%.

Embodiment 2

[0044] Add 95.5 parts of polypropylene glycol with a number average molecular weight of 1000, 0.9 parts of polypropylene ether triol with a number average molecular weight of 300, and 75 parts of diphenylmethane diisocyanate into a three-necked flask, slowly heat to 80°C and stir for 2 hours to prepare prepolymer. Then control the prepolymer at 80-85°C, add 18 parts of butanediol under stirring, pour the solution into the prepared mold when it is viscous, and mold it at 120°C for 40 minutes when it gels. Finally, the obtained sample was placed in an oven at 110°C for post-curing for 20 hours. The star-shaped polyurethane elastomer has a tensile strength of 38.7 MPa and an elongation at break of 510%.

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Abstract

The invention belongs to the technical field of polyurethane elastomers and preparation thereof and particularly relates to a method for preparing a star-shaped polyurethane elastomer through a simple bulk polymerization method. A simple body one-step method or a bulk prepolymerization method is adopted, occurrence of cross-linking reaction is avoided by regulating the proportion and molecular weight of polyols, efficient controllable synthesis of the thermoplastic star-shaped polyurethane is implemented, and thus the star-shaped polyurethane elastomer with the improved mechanical properties is obtained. Due to the adoption of the bulk prepolymerization method, the star-shaped polyurethane complex in structure can be obtained by two steps at most, raw materials are easy to obtain and cheap, requirements for a device are low, because the star-shaped polyurethane elastomer not only is simple to operate, short in preparation cycle and high in efficiency, but also can reduce device investment, and the production cost is reduced. The process for preparing the star-shaped polyurethane elastomer belongs to the bulk polymerization method, a shortcoming of preparation through a solvent in the prior art is overcome, no catalyst is used, and thus the production process is green and environmentally friendly and favorable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of polyurethane elastomers and their preparation, and in particular relates to a method for preparing star-shaped polyurethane elastomers through a simple bulk polymerization method. Background technique [0002] Thermoplastic polyurethane elastomer (TPU) refers to a type of elastomeric polymer containing more carbamate functional groups (-NH-CO-O-) on the main chain of the macromolecule. By changing the type and composition of raw materials, it can The shape and performance of the product can be greatly changed, and the final product can be obtained from soft to hard. The unique structure of polyurethane elastomer endows it with excellent elasticity, wear resistance, high tear strength, large elongation and wide hardness range. In addition, it has good vibration damping effect, large load capacity and excellent resistance to organic solvents. . The linear TPU has low melt strength, insufficient mechanical...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/42C08G18/48C08G18/66C08G18/12C08G18/32
CPCC08G18/12C08G18/4018C08G18/4202C08G18/4238C08G18/4277C08G18/4812C08G18/4825C08G18/4829C08G18/4854C08G18/6611C08G18/6674C08G18/6677C08G18/3206C08G18/3243
Inventor 党海春李振中田晓康谭小琪李廷廷刘佳楠刘超慧冯娟
Owner 山西泰宝科技有限公司
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