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Application of DMBA and DMPA

Comparison of main properties between DMBA and DMPA polyurethane emulsion

Categories:Application of DMBA and DMPA
Author:
Origin:
Time of issue:2019-09-20
Views:3

(Summary description)Comparison of main properties between DMBA and DMPA polyurethane emulsion

Comparison of main properties between DMBA and DMPA polyurethane emulsion

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Comparison of main properties between DMBA and DMPA polyurethane emulsion

(Summary description)Comparison of main properties between DMBA and DMPA polyurethane emulsion

Categories:Application of DMBA and DMPA
Author:
Origin:
Time of issue:2019-09-20
Views:3

Information

Authors: Zeng Jun, Wang Wusheng, Ruan Deli and Zhong Feng (Applied Chemistry Research Center of Anhui University, Science Enrollment Fine Chemical Plant of Anhui University)

Abstract: by using DMBA and DMPA as the hydrophilic monomers, polyurethane emulsions were prepared, their properties of emulsion and film were compared, and the reasons were discussed, so as to provide reference for industrial production.

The following performance comparisons were carried out:

1. Solubility comparison of DMBA and DMPA

It is found that the dissolution behavior of DMBA and DMPA in polymer polyols is less affected by the relative molecular weight of polymer polyols, but the dissolution temperature of DMBA and DMPA is quite different. The dissolution temperature of DMPA is 145-150 C, which is lower than this temperature, and then precipitates slowly. The dissolution temperature of DMBA is 80 C. Once it dissolves, no precipitation occurs at lower temperature. This is because the melting point of DMBA is lower (= 108-113 C), while that of DMPA is higher (= 175-188 C).

2. comparison of polyurethane emulsion properties

DMBA and DMPA polyurethane emulsion were characterized by solid content, pH, viscosity, thermal stability and emulsion appearance. The results are as follows:

number	Solid content（%）	pH	viscosity（m Pa.s）	thermal stability（60℃×72h）	Emulsion appearance
A-10 A-15 A-20	25.2 25.1 25.4	8.1 8.2 8.4	4.2 5.1 5.7	Non Gel Non Gel Non Gel	White, with a small amount of precipitation translucent Transparent pan-blue light
B-10 B-15 B-20	25.3 25.2 25.0	8.2 8.3 8.4	4.4 6.0 6.2	Non Gel Non Gel Non Gel	Milky white translucent Transparent pan-blue light

Note: A and B represent DMPA and DMBA respectively; 10, 15 and 20 represent 1.0%, 1.5% and 2.0% carboxyl content respectively; formula: hard segment content is 48%.

3. Comparison of reaction activity between DMBA and DMPA;

4. comparison of mechanical properties of polyurethane emulsion film;

5. polyurethane emulsion film comparison of water resistance, chemical resistance and low temperature resistance;

By comparing these properties, it is considered that 2,2-dihydroxymethyl butyric acid has the following characteristics:

(1) The dissolution temperature in polyether or polyester polyols is low, generally about 80 C, and has nothing to do with the relative molecular weight of the polymer polyols, so it is convenient for homogeneous reaction.

(2) The reaction time of polyurethane in DMBA system can be shortened by experiment and infrared spectrum analysis.

(3) Polyurethane film prepared by DMBA has high strength and high elasticity

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Next: Carboxylic acid type hydrophilic chain extenderDMBA、DMPA

Previous: Study on Synthesis and properties of solvent-free waterborne polyurethane

Next: Carboxylic acid type hydrophilic chain extenderDMBA、DMPA

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