Two-package curing type polyurethane paint and preparation thereof

A polyurethane coating and hardening technology, applied in polyurea/polyurethane coatings, coatings, textiles and papermaking, etc., can solve the problems of low TDI boiling point, unsuitable coatings, high viscosity of polyurethane coatings, etc., and achieve excellent tensile strength, Strong operability and good leveling effect

Inactive Publication Date: 2009-10-28
顾建荣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. TDI has low boiling point, high vapor pressure, high toxicity, poor safety and high cost;
[0005] 2. Polyurethane coating has high viscosity and poor leveling property, so it is not suitable for textile coating;
[0006] 3. The hardness of the formed polyurethane coating is not easy to adjust, so it cannot meet the needs of practical applications

Method used

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  • Two-package curing type polyurethane paint and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] According to the raw material formula of the two-liquid hardening type polyurethane coating of the present embodiment is:

[0020] 70 grams of polydihydrofuran ether diol (molecular weight 735), 60 grams of 1,4-butanediol, 158 grams of MDI, and 650 grams of dimethylformamide (DMF).

[0021] Polyurethane coatings are prepared as follows:

[0022] Add 70 grams of polydihydrofuran ether diol, 60 grams of 1,4-butanediol and 650 grams of DMF into a 2000 mL four-neck reactor, stir rapidly, heat to about 70 ° C, carry out under dry nitrogen, and gradually add MDI After reacting for about 1 hour, when it reaches the theoretical value of 158 grams, take a little reactant for FTIR spectral characteristic absorption peak test until the peak near 2270CM-1 disappears, which means the reaction is complete.

Embodiment 2

[0024] According to the raw material formula of the two-liquid hardening type polyurethane coating of the present embodiment is:

[0025] 70 grams of polydihydrofuran ether diol (molecular weight 700), 60 grams of 1,4-butanediol, 185 grams of MDI, and 700 grams of dimethylformamide (DMF).

[0026] Polyurethane coatings are prepared as follows:

[0027] Add 70 grams of polydihydrofuran ether diol, 60 grams of 1,4-butanediol and 650 grams of DMF into a 2000 mL four-neck reactor, stir rapidly, heat to about 70 ° C, carry out under dry nitrogen, and gradually add MDI , reacted for 1 hour, measured the viscosity of the system as 3500 (25°C), stopped adding MDI, and obtained the coating of this embodiment.

Embodiment 3

[0029] According to the raw material formula of the two-liquid hardening type polyurethane coating of the present embodiment is:

[0030] 70 grams of polydihydrofuran ether glycol (molecular weight 750), 60 grams of 1,4-butanediol, 185 grams of MDI, and 750 grams of DMF.

[0031] Polyurethane coatings are prepared as follows:

[0032] Add 70 grams of polydihydrofuran ether diol, 60 grams of 1,4-butanediol and 650 grams of DMF into a 2000 mL four-neck reactor, stir rapidly, heat to about 70 ° C, carry out under dry nitrogen, and gradually add MDI , reacted for 1 hour, measured the viscosity of the system as 20000 (25°C), stopped adding MDI, and obtained the coating of this embodiment.

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Abstract

The invention relates to a two-package curing type polyurethane paint and preparation thereof. The raw material system of the paint comprises a polyether polyol, a isocyanate, a small molecular chain expander and a solvent, wherein polydihydrofuran ether glycol with molecular weight between 700 to 1500 is used as the plyether polyol; methyl diphenylene diisocyanate is used as the isocyanate, 1,4-butanediol is used as the small molecular chain expander, dimethylformamide is used as the solvent. Weight proportion between the plyether polyol, the small molecular chain expander and the solvent is 1:0.7 - 0.85:8 - 15. Colloidal viscosity of the polyether polyol at 25 DEG C. is between 3000 and 2000cps. The paint is obtained by primarily charging DMF as the solvent, the polyether polyol and the chain expander into the reaction container simultaneously at one time, and then gradually charging the isocyanate for the reaction. By using MDI to substitute TDI for preparation of the polyurethane paint preparation, the invention is low in viscosity, great in levelability, easy for hardness adjustment, low in cost, safe and environment friendly in use.

Description

technical field [0001] The invention relates to a two-component hardening polyurethane coating composition especially suitable for textiles and a preparation method of the coating composition. Background technique [0002] Polyurethane is a polymer made of polyisocyanate and polyether polyol or polyester polyol or / and small molecule polyol, polyamine or water and other chain extenders or crosslinking agents. By changing the type and composition of raw materials, The shape and performance of the product can be greatly changed, and the final product can be obtained from soft to hard. Therefore, polyurethane is widely used in the manufacture of plastics, rubber, fibers, rigid and flexible foams, adhesives and coatings. As one of the important raw materials of polyurethane, isocyanates mainly include diphenylmethane diisocyanate (MDI) and toluene diisocyanate (TDI). [0003] At present, polyurethanes used as coatings include water-based polyurethanes and oil-based polyurethanes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/08D06M15/568
Inventor 顾建荣
Owner 顾建荣
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