Preparation method of reactive branched polyurethane polymeric dispersant
A polymer dispersant and branched polyurethane technology, which can be used in dyeing, textiles and papermaking, and can solve the problems of poor fiber feel
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Embodiment 1
[0037](1) 10.5 g of isofluorone diisocyanate 30g solvent tetrahydrofuran was added in three flasks, and the temperature was raised to 70 ° C, and 30 g of polyethylene glycol 1000 was slowly added to prepolymerize 2 h at 70 ° C. Synthetic waterborne polyurethane prepolymer. This process adds 3 to 4 drops of DBTDL as a reaction catalyst.
[0038](2) The temperature was further increased to 80 ° C, and 1.6 g of trimethylolpropane is suck 20 g of tetrahydrofuran, and in the reaction system, the branched reaction is carried out with the polyurethane prepolymer.
[0039](3) The system was then cooled to 60 ° C, weighing 2.5 g of 1- (3-aminopropyl) morpholine as an anchoring group reaction 2 h under 70 ° C for 2 h grafted to the branched urethane end.
[0040](4) Reactive group epoxopropanol 1 g was grafted to a polyurethane end, and the reactive branched polyurethane dispersant is synthesized, and its state is a micro-yellow solution.
[0041]The synthetic polyurethane dispersant vacuum was vacuum, a...
Embodiment 2
[0043](1) In the three flask, 13.3 g of isofluorone diisocyanate was added to 30 g of solvent tetrahydrofuran, and the temperature was raised to 70 ° C, and 2 g of polyethylene glycol 400 was slowly added to prepolymers at 70 ° C for 2 h. .
[0044](2) After the reaction was completed, the hydrophilic chain extender 2,2-dihydroxymethyl propacionic acid was added to the chain-chain reaction, the synthesis of aqueous polyurethane prepolymer, which was added 3 to 4 drops DBTDL as the reaction catalyst.
[0045](3) The temperature was further increased to 80 ° C, and 1.2 g of trihydroxymethane is weighed in 20 g of tetrahydrofuran, and in the reaction system, the reaction was branched with a polyurethane concentration.
[0046](4) The system was then cooled to 50 ° C, and 2.5 g of 1- (3-aminopropyl) morpholine was weighed as an anchoring group to react 2 h under 70 ° C for 2 h into the end of the branched urethane.
[0047](5) Finally, the reactive pentaerythritol trisatyl acrylate 4.0 g was grafte...
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