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Method for preparing water-borne functional polyurethane elastic emulsion

A polyurethane elastic and water-based polyurethane technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as difficult long-term stable dispersion, achieve enhanced water resistance, high strength and weather resistance, and solve the effect of easy agglomeration

Inactive Publication Date: 2010-08-11
ZHEJIANG UNIV
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Problems solved by technology

However, inorganic nanoparticles have high activity, are easy to agglomerate, and are difficult to disperse stably for a long time, which has become an urgent problem to be solved in nano-modification synthesis

Method used

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  • Method for preparing water-borne functional polyurethane elastic emulsion

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Embodiment Construction

[0016] The present invention is further described by examples below.

[0017] In the present invention, at first adopt traditional acetone method to prepare aqueous polyurethane dispersion, its process is as follows:

[0018] React isocyanate with polyether diol E220 at 50°C for 2 hours, then raise the temperature to 75°C, and add chain extenders such as diethylenetriamine and dimethylolpropionic acid to extend the chain; then add trimethylolpropane During the reaction, add acetone to adjust the viscosity; after reacting for 2 hours, adjust the pH value to about 7 with triethylamine; then add pure water to the reaction product, stir and emulsify, remove acetone, and finally obtain a water-based polyurethane dispersion.

[0019] The preparation method of aqueous functionalized polyurethane elastic emulsion comprises the following steps:

[0020] (1) Slowly add the mixed solution of butyl titanate and absolute ethanol to the acidic aqueous solution under the condition of a stir...

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Abstract

The invention relates to a polyurethane emulsion synthesizing technology and aims to provide a method for preparing water-borne functional polyurethane elastic emulsion. The method comprises the following steps: slowly adding mixed solution of tetrabutyl titanate and absolute ethyl alcohol into acid aqueous solution with stirring to obtain hydrated titanium ion solution; slowly adding the hydrated titanium ion solution into newly prepared water-borne polyurethane dispersion under the conditions of stirring and temperature rise to obtain titanium dioxide nanoparticle in-situ modified water-borne polyurethane dispersion after reaction for a period of time; and complexing the titanium dioxide nanoparticle in-situ modified water-borne polyurethane dispersion and silicone-acrylic emulsion in a certain proportion, and uniformly stirring the mixture to obtain the water-borne functional polyurethane elastic emulsion. The method of the invention solves the problems of easy agglomeration and difficult dispersion in nano powder modification, and endows polyurethane (paint) with higher strength and weather resistance at the same time. In addition, performance, such as water resistance and yellowing resistance, can be further enhanced by adding a proper amount of silicone-acrylic emulsion into the polyurethane dispersion.

Description

technical field [0001] The invention relates to polyurethane emulsion synthesis technology, in particular to a preparation method of water-based functionalized polyurethane elastic emulsion. Background technique [0002] Water-based polyurethane coatings have low toxicity, non-combustibility, no pollution to the environment, energy saving, and safety. They can combine the advantages of polyurethane coatings such as high hardness, strong adhesion, abrasion resistance, and flexibility with the low VOC of water-based coatings. It has become a development trend. One of the fastest coating varieties, it has been widely used in leather, furniture, building walls and other fields. Water-based polyurethane emulsion is the core raw material for the preparation of polyurethane coatings. At present, water-based polyurethane emulsion has high cost, single function, poor water resistance and easy yellowing. At present, the use of nanotechnology to upgrade and transform traditional indus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/04C08L75/08C08L33/04C08K3/22C09D175/04C09D175/08C09D133/04C09D7/12
Inventor 盛建松杨辉樊先平詹树林
Owner ZHEJIANG UNIV
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