Synthesis method of solvent resistant solvent type urethane elastomer

A technology of polyurethane elastomer and synthesis method, which is applied in the field of preparation of solvent-resistant polyurethane elastomer, and can solve problems such as excessive swelling, low content of polyurethane formate, and performance degradation

Active Publication Date: 2008-02-27
SHANDONG INOV POLYURETHANE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Reduced performance due to excessive swelling affects application
[0003] Commonly used solvent-resistant polyurethane elastomers are synthesized from polyester polyols and isocyanates. Polyester polyols are synth

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Synthesis of polyester polyol: succinic acid: 55, ethylene glycol: 16, diethylene glycol: 29 to synthesize polyester polyol A. The specific steps are: add succinic acid and polyols into the reaction kettle to heat, and protect it with nitrogen gas. When the temperature rises to 140°C, water will be reacted, and the temperature at the top of the reflux tower will be controlled at 100°C to 102°C, and then the temperature of the kettle will be raised slowly. Heat to 160°C-180°C, keep warm for 2-3 hours, then raise the temperature to 220-230°C, when the water comes out, keep warm for 2 hours, take samples to measure the hydroxyl value, acid value, and moisture. Then start vacuuming, and the vacuum reaches the maximum (-0.095Mpa) in 4 hours. During the vacuum period, samples are taken at regular intervals to measure the hydroxyl value, acid value, and moisture. When each index is qualified, the temperature is lowered and the material is discharged to obtain the polyester pol...

Embodiment 2

[0018] According to the preparation method of embodiment 1.

[0019] Synthesis of polyester polyol: succinic acid: 50, ethylene glycol: 20, diethylene glycol: 25 glycerin: 5, synthetic polyester polyol B.

Embodiment 3

[0021] According to the preparation method of embodiment 1.

[0022] Synthesis of polyester polyol: succinic acid: 46, ethylene glycol: 30, propylene glycol: 21 trimethylolpropane: 3, synthetic polyester polyol C.

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Abstract

The invention discloses a synthesizing method of solvent resistant polyurethane elastomer, which is made of polyester polyol and diisocyanate step by step or in one step, wherein the polyester polyol is reacted by succinic acid and polyol to synthesize the solvent resistant polyurethane elastomer; the obtained polyurethane elastomer is soaked in the solvent such as alcohol, toluene, ditoluene, acetone, cyclohexanone, methyl ethyl ketone and so on for 48h with weight increasing rate less than 70%; the hardness scale of the solvent resistant polyurethane elastomer is within A0-95 degree, which is applied to make solvent resistant polyurethane printed rubber-covered roll, silk-screen printing blade and so on.

Description

technical field [0001] The invention belongs to a preparation method of a polyurethane elastomer, in particular to a preparation technology of a solvent-resistant polyurethane elastomer. Background technique [0002] Polyurethane is a polymer synthetic material with properties between rubber and plastic. It is characterized by a wide range of hardness adjustment. It has both the elasticity of rubber and the hardness of plastic. Polyurethane elastomers have excellent mechanical properties, wear resistance and rebound performance. But for the application that requires higher solvent resistance, it seems powerless. It is used for immersion in solvents such as acetone, butanone, toluene, and cyclohexanone for 48 hours, and its weight increase rate is greater than 100%. Reduced performance due to excessive swelling affects the application. [0003] Commonly used solvent-resistant polyurethane elastomers are synthesized from polyester polyols and isocyanates. Polyester polyols a...

Claims

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Application Information

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IPC IPC(8): C08G18/42C08G18/10C08K5/36
Inventor 陈海良李健陈伟宋淑芳
Owner SHANDONG INOV POLYURETHANE
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