A kind of isosorbide-based antibacterial self-healing polyurethane and its preparation method and application
An isosorbide, self-healing technology, applied in the field of polyurethane, achieves the effects of strong controllability of material properties, simple process, and increased environmental protection characteristics
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[0057] Another aspect of the embodiments of the present invention also provides a method for preparing the aforementioned isosorbide-based antibacterial self-healing polyurethane, which includes: in a protective atmosphere, making polydithiol, with isosorbide groups The chain extender, isocyanate, catalyst and organic solvent are reacted in a uniformly mixed reaction system to obtain the isosorbide-based antibacterial self-healing polyurethane.
[0058] In some more specific embodiments, the preparation method specifically includes:
[0059] In a protective atmosphere, uniformly mix polydithiol, chain extenders with isosorbide groups, isocyanates, catalysts, and organic solvents to form the uniformly mixed reaction system, and maintain the reaction in the uniformly mixed reaction system The concentration of the substance is 10-50wt%;
[0060] And, reacting the homogeneously mixed reaction system at 25-100° C. for 1-24 hours, and then post-processing to obtain the isosorbide-b...
Embodiment 1
[0076] In a glove box filled with 99.999% Ar, add fresh 1,5-pentanedithiol with 1,4-cyclohexanedimethanol divinyl ether to the reactor containing azobisisobutyronitrile and THF Carry out copolymerization, settle in methanol and wash several times, then carry out vacuum drying to obtain polydithiol with thioether bond and non-planar ring structure; then this polydithiol is mixed with isophorone diisocyanate, Dibutyltin, small molecule diol with isosorbide structure and tetrahydrofuran are poured into a three-neck reactor equipped with a mechanical stirrer for one-step reaction. Wherein, [polydithiol] / [small molecule diol with isosorbide structure]=1 / 99 (mass ratio), the number average molecular weight of polydithiol is 500g / mol, dibutyltin dilaurate accounts for the reaction 0.1wt% of the total mass of the substance, the molar ratio of ([hydroxyl group]+[thiol group]) to isocyanate group is 0.5:1, the concentration of all reactants is 10wt%, and the reaction temperature is 25°C...
Embodiment 2
[0085] In a glove box filled with 99.999% Ar, add fresh 1,5-pentanedithiol with 1,4-cyclohexanedimethanol divinyl ether to the reactor containing azobisisobutyronitrile and THF Copolymerize, settle in methanol and wash several times, then vacuum dry to obtain polydithiol with thioether bond and non-planar ring structure. Then pour this polydithiol, isophorone diisocyanate, dibutyltin dilaurate, small molecular diol with isosorbide structure and tetrahydrofuran into a three-neck reactor equipped with a mechanical stirrer for one-step reaction . Wherein, [polydithiol] / [small molecule diol with isosorbide structure]=50 / 50 (mass ratio), the number average molecular weight of polydithiol is 500g / mol, dibutyltin dilaurate accounts for the reaction 0.1wt% of the total mass of the substance, the molar ratio of ([hydroxyl group]+[thiol group]) to isocyanate group is 0.5:1, the concentration of all reactants is 10wt%, and the reaction temperature is 25°C. The time is 1h. Finally, the...
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