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Modified aqueous polyurethane preparation method

A water-based polyurethane and modification technology, which is applied in the preparation field of modified water-based polyurethane, can solve the problems of unsatisfactory water resistance, mechanical properties and heat resistance, poor water resistance, mechanical properties and heat resistance, and restricting the application of polyurethane. Achieve the effects of low cost, improved tensile strength and acid and alkali resistance, and easy availability of raw materials

Inactive Publication Date: 2018-07-13
苏州浩洋聚氨酯科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With the development of water-based polyurethane, its application range continues to expand, but its shortcomings are becoming more and more obvious, such as poor water resistance, mechanical properties and heat resistance, which limit the application of polyurethane
[0004] One of the main ways to improve the water resistance, mechanical properties and heat resistance of polyurethane is cross-linking modification. However, after the existing cross-linking agent is modified, the water resistance, mechanical properties and heat resistance are not ideal, and the preparation steps are relatively complex. Complicated, harsh reaction conditions, difficult to achieve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The preparation method of modified waterborne polyurethane comprises the following steps:

[0020] (1) Under vacuum conditions, dissolve 0.04mol / L N-(2-aminoethyl)-sodium taurine sulfonate and 0.02mol polyethylene glycol in 200ml DMSO, and react at 50°C for 1.5h to obtain Prepolymer solution;

[0021] (2) Add 0.02mol chain extender diethylene glycol and catalyst dibutyltin dilaurate to the prepolymer solution obtained in step (1) at 40°C, and after reacting for 1 hour, add the basic reagent triethylene glycol The amine is neutralized to neutral, and 10ml of water is added for emulsification to obtain a polyurethane emulsion;

[0022] (3) 100 ml of trimethylol trimethacrylate DMSO solution with a concentration of 0.2 mol / L was added dropwise to the polyurethane emulsion obtained in step (2) under stirring conditions to obtain the modified water-based polyurethane.

Embodiment 2

[0024] The preparation method of modified waterborne polyurethane comprises the following steps:

[0025] (1) Under vacuum conditions, dissolve 0.06mol N-(2-aminoethyl)-sodium taurine sulfonate and 0.024mol polyethylene glycol in 200ml chloroform, and react at 55°C for 3h to obtain a prepolymer solution;

[0026] (2) Add 0.024mol chain extender dimethylolpropionic acid and catalyst dibutyltin dilaurate to the prepolymer solution obtained in step (1) at 48°C, and after reacting for 2 hours, add alkaline reagent three Ethylamine is neutralized to neutrality, and 12ml of water is added for emulsification to obtain a polyurethane emulsion;

[0027] (3) 67 ml of trimethylol trimethacrylate DMSO solution with a concentration of 0.3 mol / L was added dropwise to the polyurethane emulsion obtained in step (2) under stirring conditions to obtain the modified water-based polyurethane.

Embodiment 3

[0029] The preparation method of modified waterborne polyurethane comprises the following steps:

[0030] (1) Under vacuum conditions, dissolve 0.08mol N-(2-aminoethyl)-sodium taurine sulfonate and 0.027mol polyethylene glycol in DMF, and react at 60°C for 4h to obtain a prepolymer solution ;

[0031] (2) Add 0.027mol chain extender dimethylolpropionic acid and catalyst stannous octoate to the prepolymer solution obtained in step (1) at 55°C, and after reacting for 3 hours, add basic reagent triethylamine Neutralize to neutral, and add 16ml of water to emulsify to obtain polyurethane emulsion;

[0032] (3) 50 ml of trimethylol trimethacrylate DMSO solution with a concentration of 0.4 mol / L was added dropwise to the polyurethane emulsion obtained in step (2) under stirring conditions to obtain the modified water-based polyurethane.

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PUM

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Abstract

The invention discloses a modified aqueous polyurethane preparation method, which comprises: (1) dissolving sodium N-(2-aminoethyl)-aminoethanesulfonate and polyethylene glycol in an organic solvent under a vacuum condition, and carrying out a reaction for 1.5-4 h at a temperature of 50-60 DEG C to obtain a prepolymer solution; (2) adding a chain extender and a catalyst to the prepolymer solutionobtained in the step (1) at a temperature of 40-55 DEG C, carrying out a reaction for 1-3 h, adding an alkaline agent, neutralizing to achieve a neutral state, adding water, and emulsifying to obtaina polyurethane emulsion; and (3) adding a trimethylol trimethacrylate solution to the polyurethane emulsion obtained in the step (2) in a dropwise manner under stirring to obtain the modified aqueouspolyurethane. According to the present invention, the preparation method has characteristics of mild condition and easy achieving, and the prepared modified aqueous polyurethane has advantages of goodwater resistance, good mechanical property and good heat resistance.

Description

technical field [0001] The invention relates to the field of polyurethane preparation, in particular to a preparation method of modified water-based polyurethane. Background technique [0002] Polyurethane is used for rollers, conveyor belts, hoses, auto parts, shoe soles, synthetic leather, wires and cables, and medical artificial organs, etc. Soft foams are used as pads for vehicles, homes, and clothing, and rigid foams are used for heat insulation , Sound absorption, packaging, insulation and low-foaming synthetic wood, coatings for advanced vehicles, furniture, wood and metal protection, pool dams and building anti-seepage materials, and fabric coatings. Adhesives have good adhesion to metals, glass, ceramics, leather, fibers, etc. In addition, polyurethane can also be made into emulsion, magnetic materials, etc. [0003] With the development of water-based polyurethane, its application range continues to expand, but its shortcomings are becoming more and more obvious,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/67C08G18/48C08G18/38C08G18/34C08G18/32C08G18/12
CPCC08G18/4833C08G18/12C08G18/3857C08G18/3206C08G18/673C08G18/348
Inventor 周建颜玉荣
Owner 苏州浩洋聚氨酯科技有限公司