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Water-soluble MDI-TMP (Diphenylmethane Diisocyanate-Trimethylolpropane) polyurethane prepolymer

A polyurethane prepolymer and water-soluble technology, which is applied in the chemical field, can solve the problems of great harm to the human body, and achieve the effect of reducing damage and reducing the content of free TDI

Inactive Publication Date: 2012-04-11
WUJIANG BEISHE SHENGYUAN TEXTILE PROD AUXILIARIES PLANT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional water-soluble polyurethane is synthesized by TDI (toluene diisocyanate) and TMP (trimethylolpropane), but TDI is very harmful to the human body. The free TDI content of the TDI-TMP bridging agent produced in China More than 2~5%

Method used

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  • Water-soluble MDI-TMP (Diphenylmethane Diisocyanate-Trimethylolpropane) polyurethane prepolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Add 15 parts of ethyl acetate to a reaction kettle filled with nitrogen, then add 30 parts of MDI, raise the temperature to 50°C, stir at the same time until it is completely dissolved, add 15 parts of TMP, and raise the temperature to 70°C, the reaction 4 hours, then add 30 parts of sodium bisulfite, and finally add a small amount of phosphoric acid to adjust the pH to 6.

[0014] After testing, the technical indicators of the obtained MDI-TMP bridging agent are as follows: the appearance is a water-white transparent liquid at room temperature, the solid content is 56%, the viscosity is 1304mPa. s, the -NCO content is 11.0~11.5%, free TDI monomer The content is less than 0.05%.

Embodiment 2~3

[0016] The preparation process steps of Examples 2-3 are the same as those of Examples, except that the ratio of MDI to TMP added, end-capping agent, pH regulator and reaction parameters are different.

[0017]

[0018]

[0019] Table 1 is the ratio of MDI and TMP added in Examples 2 to 3, end-capping agent, pH regulator and reaction parameters.

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Abstract

The invention discloses water-soluble MDI-TMP (Diphenylmethane Diisocyanate-Trimethylolpropane) polyurethane prepolymer, which is prepared through the steps as follows: a, an organic solvent and MDI are added into an agitated reactor full of nitrogen or carbon dioxide, heated, stirred and dissolved; TMP is added into the liquid obtained through step a and heated for reaction for 1-4h to obtain a prepolymerized product; c, blocking agent is added into the prepolymerized product obtained in step b for reaction for 1-2h and finally the pH value is adjusted to 5-7. As harmfulless MDI is adopted, the contents of free TDI are greatly reduced, so that the harm on body health is reduced. Meanwhile, the water-soluble MDI-TMP (Diphenylmethane Diisocyanate-Trimethylolpropane) polyurethane prepolymer can also be used as a finishing agent used in the field of spinning.

Description

technical field [0001] The invention belongs to the field of chemistry, in particular to a water-soluble polyurethane prepolymer. Background technique [0002] Polyurethane has a wide range of uses, especially in the fields of synthetic fibers and textile finishing agents, because of its good mechanical properties, toughness, wear resistance, plumpness, and brightness, and can be cured at low temperature. Water-soluble polyurethane uses water as the medium, which is safe and non-flammable. It retains the excellent performance of traditional solvent-based polyurethane, and at the same time can give fabrics excellent softness, fullness, washability, wear resistance, good resilience, and smoothness. However, the traditional water-soluble polyurethane is synthesized by TDI (toluene diisocyanate) and TMP (trimethylolpropane), but TDI is very harmful to the human body. The free TDI content of the TDI-TMP bridging agent produced in China Mostly in 2~5%. Contents of the invention...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/80C08G18/76C08G18/32C08G18/10D06M15/564
Inventor 钱华张宁荣
Owner WUJIANG BEISHE SHENGYUAN TEXTILE PROD AUXILIARIES PLANT
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