Preparation method of anionic organic-solvent-free and emulsifier-free polyurethane microemulsion
An anionic, organic solvent technology, applied in the direction of adhesives, adhesive types, grafted polymer adhesives, etc., can solve problems such as insufficient hardness and tensile strength, poor stain resistance, and poor solvent resistance. Achieve the effects of short surface drying time, cost saving and high solid content
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Embodiment 1
[0022] 1) First, add 7 parts of polymer polyol to the dry reactor in parts by mass, and degas it in vacuum at 110°C for 2 hours, then pass in nitrogen, and cool down to 60°C;
[0023] 2) Next, add 8 parts of isocyanate monomer to the reactor under stirring, react for 1 hour, then add 10 parts of vinyl monomer, 3 parts of anionic hydrophilic chain extender and 0.005 parts of catalyst , continue to incubate at 60°C for 3 hours;
[0024] 3) Then, add 0.5 parts of functional monomer, react for 0.5 hours, then cool the system temperature to 30°C, then add 5 parts of alkali salt-forming agent and 80 parts of water, stir and disperse for 0.5 hours, and then heat up to 80°C;
[0025] 4) Finally, add 0.2 parts of the initiator aqueous solution, and continue the heat preservation reaction for 4 hours, that is, an anionic organic solvent-free and emulsifier-free polyurethane-polyacrylic acid microemulsion with yellowish bluish light is obtained. The average particle size of the prepared m...
Embodiment 2
[0035] 1) First, add 13 parts of polymer polyol to the drying reactor in parts by mass, and vacuum degassing at 112°C for 2 hours, then inject nitrogen, and cool down to 70°C;
[0036] 2) Next, add 8.5 parts of isocyanate monomer into the reactor under stirring, react for 1.5 hours, then add 13 parts of vinyl monomer mixture, 3 parts of anionic hydrophilic chain extender and 0.008 parts of Catalyst, continue to react at 70°C for 3.5 hours;
[0037] 3) Then, add 1 part of functional monomer, react for 1 hour, then cool the system temperature to 50°C, then add 3 parts of alkali salt-forming agent and 110 parts of water, stir and disperse for 0.5 hours, and then heat up to 80°C;
[0038] 4) Finally, add 0.5 parts of initiator aqueous solution and continue to keep warm for 3 hours to prepare a yellowish bluish anionic non-organic solvent-free emulsifier-free polyurethane-polyacrylic acid microemulsion. The average particle size of the prepared emulsion is 69.63 nm.
[0039] The...
Embodiment 3
[0048] 1) First, add 5 parts of polymer polyol to the drying reactor in parts by mass, and vacuum degassing at 114°C for 1.5 hours, then inject nitrogen, and cool down to 60°C;
[0049] 2) Next, add 7.5 parts of isocyanate monomer mixture to the reactor, react for 2 hours, then add 9 parts of vinyl monomer, 2.5 parts of anionic hydrophilic chain extender and 0.01 part of catalyst in sequence, continue Insulate and react at 60°C for 3 hours;
[0050] 3) Then, add 2 parts of functional monomer, react for 0.5 hours, then cool the system temperature to 40°C, then add 2.5 parts of alkali salt-forming agent and 75 parts of water, stir and disperse for 0.5 hours, and then heat up to 80°C;
[0051] 4) Finally, add 1 part of the aqueous solution of the initiator and continue the heat preservation reaction for 6 hours to obtain a yellowish bluish anionic non-organic solvent-free emulsifier-free polyurethane-polyacrylic acid microemulsion, and the average particle size of the prepared e...
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