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Organic silicon-modified MDI(4,4-Diphenylmethane Diisocyanate)-TMP (Trimethoprim) type polyurethane emulsion

A polyurethane emulsion and silicone technology, applied in the chemical field, can solve the problems of insufficient water resistance and mechanical properties, hazards to the human body, residual free TDI monomer, etc., achieve high water resistance and stability, and reduce damage.

Inactive Publication Date: 2012-05-02
WUJIANG BEISHE SHENGYUAN TEXTILE PROD AUXILIARIES PLANT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, toluene diisocyanate (TDI) is mostly used as raw materials in China, but TDI is highly toxic, and there will be free TDI monomer residues in the application process, so it is harmful to the human body
And the general water-based polyurethane has insufficient water resistance and mechanical properties in textile printing and dyeing.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0006] The technical solutions of the present invention will be described in detail below in conjunction with the examples, but the protection scope of the present invention is not limited to the examples.

[0007]

[0008] In a reaction kettle filled with nitrogen and equipped with a stirrer and a reflux device, after adding ethyl acetate, add 40% (weight ratio) of MDI while stirring, and raise the temperature to about 45°C, and stir to dissolve completely. Add 20% (by weight) of TMP and a small amount of lithium oxide, heat to 70 ° C for 4 hours to obtain a prepolymerized product; then add 2% of side aminoethylpropyl polydimethylsiloxane oligomers and After reacting at ℃ for 30 minutes, add a small amount of sodium bisulfite, and react at 50℃ for 2 hours, and adjust the pH to 4.5, then add distilled water to emulsify for 20 minutes under rapid stirring to obtain silicone-modified waterborne MDI-TMP polyurethane lotion.

[0009] The silicone-modified water-based MDI-TMP pol...

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PUM

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Abstract

The invention discloses an organic silicon-modified MDI(4,4-Diphenylmethane Diisocyanate)-TMP(Trimethoprim) type polyurethane emulsion which is prepared by the following steps of: a, adding ethyl acetate and MDI into a reaction kettle filled with nitrogen gas; after the mixture is fully dissolved, adding TMP and a small amount of lithium oxide; heating to be 50-70DEG C and reacting for 1-4 hours to obtain a pre-polymerized product; b, adding a side-aminoethyl propyl polydimethylsiloxane oligomer in the pre-polymerized product obtained in the step a, raising the temperature to be 50-70DEG C and reacting for 30 minutes; and c, adding sodium bisulfite in the step b, reacting at 50DEG C for 1-2 hours, and finally, adjusting the pH value to be 4.5, adding distilled water by quickly stirring and emulsifying for 10-20 minutes. According to the silicon-modified MDI-TMP type polyurethane emulsion disclosed by the invention, due to the adoption of low-toxicity MDI, the content of free MDI is greatly reduced and thereby the hurt to human health is reduced; and meanwhile, waterborne polyurethane is modified by an organic silicon substance, so that the modified waterborne polyurethane has performances, such as high water resistance, stability and the like.

Description

technical field [0001] The invention belongs to the field of chemistry, in particular to modified polyurethane. Background technique [0002] Because water-washable polyurethane contains low volatile organic solvents, has good mechanical properties, strong adhesion, and strong moisture and water permeability, it is widely used in coatings, adhesives, and textile printing and dyeing industries. At present, toluene diisocyanate (TDI) is mostly used as raw materials in China, but TDI is highly toxic, and there will be free TDI monomer residues in the application process, so it is harmful to the human body. Moreover, the water resistance and mechanical properties of general water-based polyurethane in textile printing and dyeing are not enough. Contents of the invention [0003] Purpose of the invention: In view of the above-mentioned defects, the present invention provides a low-toxic MDI (4,4-diphenylmethane diisocyanate) raw material to prepare a silicone-modified water-ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/61C08G18/32C08G18/10
Inventor 钱华张林荣
Owner WUJIANG BEISHE SHENGYUAN TEXTILE PROD AUXILIARIES PLANT
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