Preparation method of thermoplastic polyurethane elastomer

A thermoplastic polyurethane and elastomer technology, applied in the field of polymer preparation, can solve the problems of heat transfer efficiency reduction, side reactions, prolonging operation time, etc., and achieve the effect of prolonging the prefabrication time

Inactive Publication Date: 2020-12-04
周开
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when the existing prepolymer method is used to produce polyurethane elastomers, due to the relatively active diisocyanate (MDI), in the production of the prepolymer, the wall of the reaction kettle is seriously bonded, and cleaning is difficult, which reduces the heat transfer efficiency and prolongs the operating time. At the same time, due to the side reaction of the diisocyanate (MDI) prepolymer sticking to the wall, the content ratio of -NCO and OH is disrupted, so that the physical properties of the TPU can not meet the original requirements.

Method used

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  • Preparation method of thermoplastic polyurethane elastomer
  • Preparation method of thermoplastic polyurethane elastomer
  • Preparation method of thermoplastic polyurethane elastomer

Examples

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preparation example Construction

[0036] like Figure 1-Figure 5 Shown, the preparation method of a kind of thermoplastic polyurethane elastomer of the present invention, this method comprises the steps:

[0037] S1: Melt the polymer polyester diol (PES) and add the same amount to the two material tanks A, heat to the required material temperature of 100-120°C, and vacuum dehydrate for 2-3 hours under low-speed stirring to make the water content ≤ 0.05%, ready for use after releasing the vacuum and venting nitrogen;

[0038] S2: Melt the diisocyanate (MDI) and add the same amount to two reaction kettles 1, heat it in a water bath to the required temperature of 45-52°C, and degas it under vacuum for 30-45 minutes under low-speed stirring to make it meet the requirements. Vacuum and pass nitrogen for standby; heat the diisocyanate in the reactor 1 by means of water bath flow heating, which can improve the efficiency of vacuum degassing of diisocyanate after heating;

[0039] S3: Add low-molecular-weight diol (...

Embodiment approach

[0043] As an embodiment of the present invention, the stirring drive mechanism includes a stirring shaft 41, a U-shaped stirring frame 42, a stirring column 43, a spiral stirring bar 44, a scraper blade 45 and an electric telescopic rod 46; the stirring shaft 41 is rotated and inserted In the inner kettle body 3, and the top of the stirring shaft 41 extends out of the outer kettle body 2 and is connected to the output end of the drive motor, and the driving motor is fixed to the top of the outer kettle body 2; the outer wall of the stirring shaft 41 is evenly fixed in the circumferential direction A plurality of U-shaped stirring racks 42, and the inner wall of the vertical bar 421 of the U-shaped stirring rack 42 is provided with a plurality of stirring columns 43; the ends of a plurality of said stirring columns 43 are all provided with a spiral stirring bar 44; The outer wall vertical direction of straight bar 421 is provided with scraper blade 45, and scraper blade 45 and t...

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Abstract

The invention belongs to the technical field of polymer preparation, and particularly relates to a preparation method of a thermoplastic polyurethane elastomer. The method comprises the following steps: S1, melting polymer polyester diol (PES), equivalently adding the molten PES into two material tanks A, carrying out heating to a required material temperature of 100-120 DEG C, removing vacuum, and introducing nitrogen for later use; S2, melting diisocyanate (MDI), equivalently adding molten MDI into the two reaction kettles, carrying out heating to 45-52 DEG C in a water-bath flowing manner,carrying out vacuum degassing for 30-45 minutes under low-speed stirring, removing vacuum, and introducing nitrogen for later use, wherein diisocyanate in the reaction kettles is heated in the water bath flowing heating manner, so the vacuum degassing efficiency of the heated diisocyanate is improved; and S3, conveying stock solutions prepared in the steps S1 and S2 and various solvents to a pouring head, carrying out uniform primary mixing under high-speed stirring, conveying the obtained mixture to a double-screw reaction extruder, carrying out further uniform mixing and a chemical reaction,and carrying out granulation and screening to prepare the thermoplastic polyurethane elastomer.

Description

technical field [0001] The invention belongs to the technical field of polymer preparation, in particular to a preparation method of thermoplastic polyurethane elastomer. Background technique [0002] Polyurethane elastomer (TUP) refers to a type of elastomeric polymer containing more carbamate functional groups (NH-CO-O-) on the main chain of the macromolecule, and is a typical multi-block copolymer. It has many advantages such as good wear resistance, wide hardness range, high strength, high elongation, large load support capacity, good shock absorption effect, good low temperature resistance and excellent oil and weather resistance. Compared with rubber materials, polyurethane elastomers have a series of advantages such as wear resistance, tear resistance, ozone resistance, cut resistance, high load capacity, pourable, potting, wide hardness range, transparent or translucent; and plastic In comparison, polyurethane elastomers have the advantages of not being brittle, wea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/42C08G18/32B01J19/20
CPCB01J19/20C08G18/3206C08G18/4238C08G18/664
Inventor 周开曹方芹
Owner 周开
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