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Preparation method for aqueous polyurethane-polyurea dispersion

A water-based polyurethane and dispersion technology, which is applied in the preparation of chemical dispersion systems and the preparation of water-based polyurethane-polyurea water dispersions, can solve the problems of system viscosity increase, failure to emulsify normally, environmental pollution, etc., and achieve stability and mechanical properties Good, stable and controllable reaction process, simple process

Inactive Publication Date: 2012-02-15
惠州市汉诺新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, in the preparation process of water-based polyurethane-polyurea dispersion, the raw materials are required to be fully dehydrated, and contact with water is strictly prohibited during the production process, otherwise the viscosity of the system will increase and cannot be emulsified normally, which will seriously lead to gelation during the prepolymerization process, and during the production process Need to add a certain amount of co-solvent, such as acetone, butanone, dimethylformamide, methyl pyrrolidone, a certain amount of VOC will be released during production or use, causing environmental pollution

Method used

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  • Preparation method for aqueous polyurethane-polyurea dispersion
  • Preparation method for aqueous polyurethane-polyurea dispersion
  • Preparation method for aqueous polyurethane-polyurea dispersion

Examples

Experimental program
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Effect test

Embodiment 1

[0033] 2000ml three-neck flask, equipped with thermometer, stirring, water bath and stirring device. Add 791g deionized water to the three-necked flask under ice-water bath conditions, add 50g JEFFAMINE M-2070 (polyether monoamine, average relative molecular weight 2000, EO / PO=31 / 10) under stirring conditions, stir and dissolve into a uniform solution, and then Add 16g of sodium lauryl sulfate, and control the temperature of the system at 0°C to 2°C; then weigh 200g of GE-220 (polyether polyol, with an average relative molecular weight of about 2000, and a hydroxyl value of 54.5 to 57.5mg KOH / g) and 40g of iso Phortone diisocyanate was mixed evenly, added into a three-necked flask, stirred rapidly for 10 minutes under ice-water bath conditions, and the temperature of the system was controlled at 0°C to 2°C to obtain a light blue transparent microemulsion. Then, under low-speed stirring, add 0.1g organic bismuth catalyst (Neobi 200, metal bismuth content 19.3-20.7%), slowly hea...

Embodiment 2

[0035] 2000ml three-neck flask, equipped with thermometer, stirring, water bath and stirring device. Add 740g deionized water to the three-necked flask under ice-water bath conditions, add 50g JEFFAMIN ED-600 (polyether diamine, average relative molecular weight 600, EO / PO molar ratio = 9 / 3.6) under stirring conditions, stir and dissolve into a uniform solution , add 10g of sodium lauryl sulfate, and control the temperature of the system at 0°C to 2°C; then weigh 180g of polyoxypropylene glycol (PPG, with an average relative molecular weight of about 2000, and a hydroxyl value of 106 to 118mgKOH / g) and 31.5g Mix hexamethylene-1,6-diisocyanate evenly, add it into a three-necked flask, stir rapidly for 10 minutes in an ice-water bath, and control the temperature of the system at 0°C to 1°C to obtain a light blue transparent microemulsion. Then, under low-speed stirring, add 0.1 g of dibutyltin laurate and 0.1 g of organic bismuth catalyst (Neobi 200, metal bismuth content 19.3 t...

Embodiment 3

[0037]2000ml three-neck flask, equipped with thermometer, stirring, water bath and stirring device. Add 405g of deionized water to the three-necked flask under ice-water bath conditions, add 30g of JEFFAMIN ED-900 (polyether diamine, average relative molecular weight 900, EO / PO molar ratio = 12.5 / 6.0) under stirring conditions, and stir to dissolve into a uniform solution , add 10g sodium dodecylbenzenesulfonate (analytically pure, active ingredient content ≥ 95%), and control the temperature of the system at 0°C to 2°C; then weigh 76g refined castor oil and 30.2g 4,4'-isocyanate ring Hexyl ester methane (MDA, purity ≥ 99.5%) was mixed evenly, added to a three-necked flask, stirred rapidly for 10 minutes under ice-water bath conditions, and the system temperature was controlled at 0°C to 2°C to obtain a light blue transparent microemulsion. Then, under low-speed stirring, add 0.1g organic bismuth-type catalyst (Neobi 200, metal content 19.3-20.7), slowly raise the temperature ...

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Abstract

The invention discloses a preparation method for aqueous polyurethane-polyurea dispersion and aims at providing a method for producing polyurethane-polyurea without using cosolvents and solvents in the process of preparation. The method comprises the following steps: 1) weighing water with a mass percent of 60 to 80%, adding the weighed water into a reactor, then adding polyetheramine with a mass percent of 1 to 5%, uniformly mixing the two, adding an anionic surfactant with a mass percent of 0.5 to 2%, and carrying out stirring to realize uniform mixing; 2) weighing polymer polyol with a mass percent of 10 to 25% and polyisocyanate with a mass percent of 2 to 8%, and uniformly mixing the two; 3) adding a substance obtained in step 2) into a substance obtained in step 1), and carrying out stirring to realize uniform mixing; 4) adding an organo-metallic catalyst with a mass percent of 0.001 to 0.1% into a substance obtained in step 3), and allowing an obtained mixture for reaction with stirring for 2 to 6 hours at a temperature of 40 to 80 DEG C so as to produce the aqueous polyurethane-polyurea dispersion. The invention belongs to the technical field of preparation of a chemical disperse system.

Description

technical field [0001] The invention relates to a dispersion system, in particular to a method for preparing a water-based polyurethane-polyurea water dispersion, and belongs to the technical field of chemical dispersion system preparation. Background technique [0002] The traditional way of preparing water-based polyurethane is to prepolymerize alcohols, polyols and diisocyanates containing carboxyl hydrophilic groups in a small amount of high-boiling point organic solvents as co-solvents, and then neutralize them with tertiary amines. The polymer has an ionic type, so it has hydrophilicity. Dilute the ionic prepolymer with an appropriate amount of solvent, disperse it in water for emulsification and chain extension reaction, and obtain a water-based polyurethane-polyurea dispersion or a multi-component polyurea dispersion. Alcohol and diisocyanate prepolymerization reaction, add a large amount of low boiling point solvent, carry out chain extension emulsification with hyd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/50C08G18/40C08G18/48C08G18/42C08G18/44C08G18/62C08G18/67C08G18/58C08G18/64
Inventor 张卫东吕钱江
Owner 惠州市汉诺新材料有限公司
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