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Thermoplastic polyurethane elastomer and preparation method thereof

A thermoplastic polyurethane and elastomer technology, which is applied in the field of polymer compounds and its preparation, can solve problems such as static mixers or filling machines are easy to block, TPU melt MI changes too much, and product quality in the production process is affected. Good color, uniform molecular weight distribution, and high recovery times

Inactive Publication Date: 2013-07-17
SHANGHAI HENGAN POLYURETHANE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] These two methods have their own advantages and disadvantages: when using a static mixer or filling machine, it often happens that the static mixer or filling machine is easily blocked, and due to insufficient shear force, the material is easily blocked at the dispersion port, resulting in shutdown of the production process; At the same time, the flow deviation of the metering pump causes the MI of the TPU melt in the process to change too much, resulting in uneven molecular weight distribution.
The process of using twin-screw high-speed rotation to uniformly disperse the material requires a fast screw speed, so that the residence time of the material in the extruder is very short, causing some materials to not completely react, and too high a speed will easily lead to the breakdown of TPU polymers. Decomposition, leading to quality loss
Therefore, the existing domestic processes all have these problems that seriously affect the production process and product quality.

Method used

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  • Thermoplastic polyurethane elastomer and preparation method thereof
  • Thermoplastic polyurethane elastomer and preparation method thereof
  • Thermoplastic polyurethane elastomer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4 and comparative example 1-2

[0028] Embodiment 1-4 and comparative example 1-2 adopt following raw material and auxiliary agent:

[0029] PTMEG1000 polytetrahydrofuran ether glycol, Mitsubishi, Japan, molecular weight 1000;

[0030] PBA 1000 Polyadipate-1,4-butylene glycol ester diol, Taiwan Yongchun, molecular weight 1000;

[0031] PBA 2000 Polyadipate-1,4-butylene glycol ester diol, Taiwan Yongchun, molecular weight 2000;

[0032] MDI 4,4-diphenylmethane diisocyanate, Japan NOU, molecular weight 250.26;

[0033] BDO 1,4-butanediol, Mitsubishi Chemical, molecular weight 90.12;

[0034] Dabco T-9 stannous octoate, gas chemical industry;

[0035] Irganox1010 tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester, Ciba Specialty Chemicals;

[0036] Irgafos168 tris(2,4-di-tert-butylphenyl) phosphite, Ciba Specialty Chemicals;

[0037] Tinuvin 329 2-(2′-hydroxy-5′-tertoctylphenyl)benzotriazole, Ciba Specialty Chemicals;

[0038] Tinuvin 292 bis(1,2,2,6,6-pentamethyl-4-piperid...

Embodiment 1

[0042] Component A uses PTMEG1000, the organic diisocyanate is MDI, and the small molecule diol is BDO. Heat them to 90°C, 60°C, and 45°C respectively, and add 20ppm of DABCO to A component T-9, 0.2wt% Irganox1010, 0.2wt% Irgafos168, 0.4wt% Tinuvin 329, 0.4wt% Tinuvin292, 0.4wt% Licowax C.

[0043] The above three components are introduced into the twin-screw pre-mixing unit with a temperature of 160°C and a speed of 400rpm through a metering pump and a flow meter at a ratio of 53.0wt%, 37.9wt%, and 9.1wt%, respectively, and then the temperature is 200°C, extruded by a reactive twin-screw extruder with a rotation speed of 200rpm, and finally synthesized thermoplastic polyurethane elastomer particles by underwater pelletizing.

Embodiment 2

[0045] Component A uses PBA1000, the organic diisocyanate is MDI, and the small molecule diol is BDO. Heat them to 90°C, 60°C, and 45°C respectively, and add 20ppm of DABCO to the A component T-9, 0.2wt% Irganox1010, 0.2wt% Irgafos168, 0.4wt% Tinuvin 329, 0.4wt% Tinuvin292, 0.4wt% Licowax C, 0.3wt% Staboxol P100.

[0046] The above three components are introduced into the twin-screw premixing unit at a temperature of 160°C and a speed of 400rpm through a metering pump and a flowmeter at a ratio of 53.0wt%, 37.9wt%, and 9.1wt%, respectively, and then passed through a temperature of 200 °C, extruded by a reactive twin-screw extruder with a rotational speed of 200rpm, and finally pelletized under water to synthesize thermoplastic polyurethane elastomer particles.

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Abstract

The invention relates to a thermoplastic polyurethane elastomer and a preparation method thereof. The preparation method comprises the following steps of: mixing polyester polyol, polyether polyol or a mixture of polyester polyol and polyether polyol, organic diisocyanate and micromolecular diol, inputting into a twin-screw premixing unit, shearing and dispersing in axial and radial directions ata high speed for 1 to 2 minutes to make the polymer have certain viscosity and molecular weight, pressing into a co-rotating reactive twin-screw extruder at the temperature of between 180 and 240DEG C, reacting for 2 to 3 minutes, and performing underwater granulation by using a granulator to obtain thermoplastic polyurethane elastomer particles. Compared with the prior art, the invention has a series of advantages that: production equipment investment is small, the process is simple, the process is controlled stably, and the prepared polyurethane elastomer has a few gel points, good appearance and color, good physical and mechanical properties, uniform molecular weight distribution and wide application prospect.

Description

technical field [0001] The invention relates to a polymer compound and a preparation method thereof, in particular to a thermoplastic polyurethane elastomer and a preparation method thereof. Background technique [0002] The mainstream route of the existing thermoplastic polyurethane elastomer production process is to form a polyurethane prepolymer at the initial stage of mixing with high molecular weight diols (including polyester polyols and polyether polyols) and organic diisocyanates and then combine them with quantitative low molecular weight The chain extension reaction of diols is carried out, and the isocyanate index is controlled between 0.95-1.05 to adjust the processability of the polymer. [0003] Domestic patent CN 1563133A uses a pouring machine to mix diol and isocyanic acid evenly at high speed, and then prepares Shore A50-80 soft TPU material through a twin-screw extruder; [0004] Patent CN1434066A discloses that the three-component material is directly in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08L75/06C08L75/08B29B9/06B29C47/92B29C48/92
CPCB29C48/04
Inventor 孙水升刘宝全付海龙顾国鑫
Owner SHANGHAI HENGAN POLYURETHANE CO LTD
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