| abstract |
The invention discloses a kind of preparation methods of non-ion aqueous polythiourethane, include the following steps：Liquid polysulfide rubber, hydrophilic dihydric alcohol are mixed with isocyanates, reaction synthesis terminal isocyanate group polysulfide modified polyurethane prepolymer；Terminal isocyanate group polysulfide modified polyurethane prepolymer and small molecule chain extender, crosslinking agent are carried out chain extending reaction and obtain isocyanate group polysulfide modified polyurethane；Isocyanate group polysulfide modified polyurethane is emulsified to obtain non-ion aqueous polythiourethane dispersion.Liquid polysulfide is introduced into polyurethane structural and improves polymer performance by the present invention, by polythiourethane Water-borne modification, to improve the environmental-protecting performance of aqueous polyurethane, and expands it and uses field.The non-ion aqueous polythiourethane of gained of the invention can be used with anions and canons resin mixture, adhesive force, wearability, flexibility, density, resistant of high or low temperature, resistance to ozone, oil resistivity are good, it is wet, gas permeability is low, especially acid and alkali-resistance, electrolyte resistance are excellent. |