Castor Oil Polyol Emulsions for Polymer Cement Viscosity
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Solution Overview
Problem
The preparation of polymer cements from castor oil emulsions and methylenediphenyl diisocyanate (MDI) is hindered by the high viscosity of castor oil emulsions and the need for additional reaction steps to form ricinoleic acid/monoepoxide adducts, which still contain OH groups that increase viscosity and react with MDI under basic conditions.
Innovation Solution
Low-viscosity emulsions are prepared from castor oil and monoepoxides, where the monoepoxide reacts with ring opening to form glycol and provide OH groups under polymer cement formation conditions, enabling efficient reaction with MDI and cement to form polymer cements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If castor oil emulsions are used for polymer cement preparation, then the desired chemical reactivity with MDI is achieved, but the viscosity is too high for optimal processing
Solution Approach 1:
A reactive diluent containing no OH groups is introduced as an intermediary substance. This diluent reduces the viscosity of the castor oil emulsion without containing OH groups that would increase viscosity through hydrogen bonding. Under the basic reaction conditions of polymer cement formation, the diluent forms free OH groups in situ that then react with MDI for crosslinking, thus achieving both low viscosity during processing and desired reactivity during curing.
2Productivity
If ricinoleic acid/monoepoxide adducts are prepared to reduce viscosity, then the viscosity is lower than pure castor oil, but an additional reaction step is required
Solution Approach 1:
Instead of pre-forming ricinoleic acid/monoepoxide adducts in a separate reaction step, the patent uses a reactive diluent that directly mixes with the castor oil emulsion in its original state. The diluent contains no OH groups initially, allowing simple mixing without preliminary reaction steps, yet becomes reactive in situ under the basic conditions of polymer cement formation.
3Force
If reactive diluents containing no OH groups are used, then viscosity is reduced, but OH groups must form under basic conditions which then react with MDI
Solution Approach 1:
The reactive diluent is designed to self-generate the necessary OH groups under the basic reaction conditions already present in the polymer cement formation process. The diluent contains no OH groups initially, providing low viscosity, but automatically forms free OH groups in situ when exposed to the basic conditions, which then react with MDI for crosslinking. This eliminates the need for separate OH group introduction steps or additional reagents.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution results in stable, low-viscosity emulsions that can be effectively reacted with MDI and cement to produce polymer cements with improved processability and water resistance, suitable for applications like floor coatings.
Implementation Method 1
the monoepoxide reacts with ring opening to give the corresponding glycol and thus provide the required OH groups
Implementation Method 2
forms free OH groups which then react with the MDI with crosslinking
Implementation Method 3
low-viscosity emulsions having the desired properties, which can be reacted with MDI and cement to give polymer cements, can be prepared from castor oil and monoepoxides
Data Source
AI summary
A polyol emulsion of castor oil and monoepoxides is combined with methylenediphenyl diisocyanate (MDI) and cement to produce a polymer cement.