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Polymer dispersion with nanoscale polyurea particles dispersed in polyether

A technology of dispersion liquid and polyether, which is applied in the field of dispersion liquid of polyurea particles in polyols, and can solve problems such as polyurethane incompatibility and product incompatibility

Active Publication Date: 2020-03-10
DOW GLOBAL TECH LLC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This can lead to severe incompatibility of its products which, in turn, lead to severe incompatibility of polyurethanes made using the products

Method used

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  • Polymer dispersion with nanoscale polyurea particles dispersed in polyether
  • Polymer dispersion with nanoscale polyurea particles dispersed in polyether

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0062] A flask equipped with a stirrer, thermocouple, addition funnel condenser, and nitrogen line was charged with ethylene oxide-terminated poly(oxypropylene) diol having a molecular weight of about 4000. Under nitrogen, triethylenetetramine was added to the diol. Bring the temperature to 30°C and start venting nitrogen. Subsequently, the polymeric MDI product having an isocyanate functionality of 3.0 is added over a period of 3 to 10 minutes. The amounts of triethylenetetramine and polyisocyanate are selected together so that (1) their combined weight is 10% by weight of the diol and (2) provide about 1.05 to 1.2 amino groups per isocyanate group. The polyisocyanate was added slowly to minimize exothermic temperature rise. The reactor contents were stirred for approximately one hour after the polyisocyanate addition was complete, and then heated to 60° C. for 2 to 4 hours. A small amount of aminobutanol is then added to consume any remaining isocyanate groups and introdu...

example 2

[0065] Example 2 - An ethylene oxide terminated poly(oxypropylene) glycol having a molecular weight of about 4000 was charged to a flask equipped with a stirrer, thermocouple, addition funnel condenser, and nitrogen line. 3,5-Bis(methylthio)-2,4-diaminotoluene was added to the diol under nitrogen. Bring the temperature to 30°C and start venting nitrogen. Subsequently, the polymeric MDI product having an isocyanate functionality of 3.0 is added over a period of 3 to 10 minutes. The amounts of diamine and polyisocyanate are selected together so that (1) their combined weight is 5% by weight of the diol, and (2) provide about 1.05 to 1.2 amino groups per isocyanate group. The polyisocyanate was added slowly to minimize exothermic temperature rise. The reactor contents were stirred for about one hour after the polyisocyanate addition was complete, and then heated to 35°C for 2 to 4 hours. A small amount of aminobutanol is then added to consume any remaining isocyanate groups an...

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Abstract

The present invention relates to dispersions of polyurea particles prepared by reacting polyisocyanate compounds with co-reactants comprising at least one polyamine dispersed simultaneously in a matrix polyether. The polyisocyanate or polyamine, or both, has a functionality of at least 2. Highly preferred co-reactants are aromatic diamines substituted with alkylthio groups, such as 3,5-bis(methylthio)-2,4-toluenediamine. The dispersion has very small particles which promote storage stability.

Description

technical field [0001] The invention relates to a process for preparing a dispersion of polyurea particles in polyols suitable for producing elastic polyurethane foams. Background technique [0002] Dispersions of polyurea particles in polyols are well known materials. It is commonly referred to as "PHD polyol". It is commonly used in the preparation of polyurethane foams. Dispersed particles can help open the cells of the elastic foam. It can also increase the load-bearing properties of the foam and, in some cases, improve fire resistance. [0003] PHD polyols are produced by reacting polyisocyanate compounds with amines or hydrazides while dispersing the material in the polyol. Polyisocyanate reacts with amino or hydrazide groups to form polyurea polymer particles, which are dispersed in polyol to form the continuous phase. [0004] A small amount of polyol molecules can also react. In this way, an amount of polyol can become "grafted" to the dispersed polyurea parti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/48C08G18/66C08G18/76C08G18/08C08G18/32C08G18/40
CPCC08G18/4841C08G18/6674C08G18/7664C08G18/0876C08G18/10C08G18/3228C08G18/324C08G18/409C08G18/3271C08G18/4833C08G18/7671
Inventor H·沈R·C·埃文
Owner DOW GLOBAL TECH LLC