Preparation method of reactive branched polyurethane polymeric dispersant
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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
Inactive Publication Date: 2021-05-11
JIANGNAN UNIV
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[0005] The above polyurethane dispersants all have good dispersion properties, but after printing, it is still necessary to add an adhesive to fix the fabric on the fiber, resulting in poor fiber feel
Method used
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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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Abstract
The invention discloses a preparation method of a reactive branched polyurethane polymeric dispersant, which comprises the steps of (1) putting phorone diisocyanate into a three-neck flask, heating to the temperature of 65-75 DEG C in an oil bath pan, and adding polyethylene glycol to react to synthesize a polyurethane prepolymer; (2) raising the temperature to 75-85 DEG C, and adding 2,2-dimethylolpropionic acid to carry out chain extension reaction; (3) after the chain extension reaction is completed, adding a branched structural monomer, keeping the temperature at 75-85 DEG C, and carrying out a branching reaction; (4) after the branching reaction is finished, reducing the temperature to 50-60 DEG C, grafting an anchoring group at the tail end of the polyurethane, and keeping the end capping rate at 50-75%; and (5) controlling the temperature at 50 DEG C, further grafting a reactive group, and completely blocking the isocyanate group. According to the invention, the polyurethane dispersant is designed into a branched structure on the basis of the polyurethane dispersant, and then a reactive group is introduced to the tail end, so that the self-crosslinking effect can be realized, and the color fixation effect can be achieved without adding an adhesive.
Description
Technical field[0001]The present invention is a technical field of functional polyurethane aid, and more particularly to a method of preparing a reactive branched polyurethane polymer dispersant.Background technique[0002]The organic pigment has the advantages of good photosensitive, high transparency, high color saturation, and strong fiber applicability, and has been widely used in the textile printing industry. However, when the discrete performance of the organic pigment, the solubility is poor, when the solid particles are introduced into the aqueous medium, due to the toner, Van Dehua, hydrogen bonding force, the pigment particles are prone to agglomeration, so in order to improve the efficiency of solid particles in water, The stability of reinforcing dispersion is usually introduced into the dispersant. The polymer dispersant has received wide attention in the past few decades due to its prominent dispersibility and stability. With respect to the small molecule dispersant, th...
Claims
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