US 8,263,703 B2 · One-component self-crosslinking reactive siloxane-terminated polypropylene oxide emulsion and process for preparing the same

Abstract

The present invention is related to an one component self-crosslinking reactive siloxane-terminated polypropylene oxide emulsion and a process for preparing the same. In the inventive process, using a reactive siloxane-terminated polypropylene oxide (SPPO) as raw material and a polyether-modified polysiloxane as protection colloid, a waterborne SPPO emulsion with excellent storage stability and freeze-thaw stability was prepared through phase inversion emulsification in the presence of composite emulsifying agent. And this process has some advantages such as low capital investment for equipment, simple procedure, easy operation and low production cost. And the obtained SPPO emulsion can be used as basic raw materials for the production of environmental friendly waterborne products such as paints, binders, sealing agents etc.

Claims22

Dependent claims

An one component self-crosslinking reactive siloxane-terminated polypropylene oxide emulsion, which comprises a reactive siloxane-terminated polypropylene oxide;

a composite emulsifying agent;
and optionally a lipophilic cosolvent and a protecting colloid dissolved in water, wherein the reactive siloxane-terminated polypropylene oxide has a weight average molecular weight of from 1500 to 150000, and the following schematic formula:
wherein, n is 0 or 1, m is an integer from 0 to 10, x is an integer from 1 to 50, y is an integer from 15 to 2000, R1 is methyl or ethyl, R2 is methyl or ethyl, R3 is methylene or —(CH2)3—, R4 is H or phenyl, R5 is methyl or H, G is
in which R6 is —(CH2)6—,

1 more element

A process for preparing an one component self-crosslinking reactive siloxane-terminated polypropylene oxide emulsion through phase inversion emulsification, wherein the reactive siloxane-terminated polypropylene oxide having a weight average molecular weight of from 1500 to 150000, and has the following schematic formula:

wherein, n is 0 or 1, m is an integer from 0 to 10, x is an integer from 1 to 50, y is an integer from 15 to 2000, R1 is methyl or ethyl, R2 is methyl or ethyl, R3 is methylene or —(CH2)3—, R4 is H or phenyl, R5 is methyl or H, G is
in which R6 is —(CH2)6—,
comprising the following steps:
a. adding the reactive siloxane-terminated polypropylene oxide and a composite emulsifying agent, optionally a lipophilic cosolvent and a protecting colloid, into a reactor, and mixing the same with stirring;
b. adding water into the mixture and further mixing with stirring;
and
c. after adding water, further stirring for a time to obtain the one component self-crosslinking reactive siloxane-terminated polypropylene oxide emulsion.

4 more elements

Dependencies are inferred from the claim text.

One-component self-crosslinking reactive siloxane-terminated polypropylene oxide emulsion and process for preparing the same

Life of this patent

One-component self-crosslinking reactive siloxane-terminated polypropylene oxide emulsion and process for preparing the same

Life of this patent

Abstract

Claims22