Preparation method of cation-type waterborne polyurethane wool anti-felting emulsion

Preparation method of cation-type waterborne polyurethane wool anti-felting emulsion

  • CN 104,878,604 A
  • Filed: 05/08/2015
  • Published: 09/02/2015
  • Est. Priority Date: 05/08/2015
  • Status: Active Application
First Claim
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1. a cation-type water-thinned polyurethane felt proofing emulsion preparation method, is characterized in that, carries out according to following step:

  • (1) aqueous polyurethane prepolymerization reaction;

    by the polyether polyol of metering at 100 ~ 120 DEG C, dewater 1 ~ 2 hour under (9.99 ×

    104Pa) vacuum, regulate pre-polymerization temperature to 70 ~ 85 DEG C, the isophorone diisocyanate (IPDI) and the organotin catalysts that add metering react 2 ~ 3 hours, and always mol ratio that is diisocyanate based and total hydroxyl is 1.25 ~ 1.50.Period does tracking and measuring isocyanate group (-NCO) content, stops this reacting when-NCO reaches theoretical value 5.0 ~ 9.0%;

    (2) hydrophilic chain extending reaction;

    the cationic hydrophilic monomer slowly dripping metering in the reactor in 40 ~ 55 DEG C of chain extending reactions 1 ~ 2 hour, and adds appropriate solvent according to system viscosity and reduces viscosity;

    (3) end capping reaction;

    add the end-capping reagent of metering after chain extending reaction in 40 ~ 70 DEG C of reactions 1 ~ 2 hour in reactor, and to free-NCO content tracing detection, stop reaction when remaining-NCO% reaches theoretical value 1.2 ~ 1.5%;

    (4) neutralization reaction;

    be cooled to 30 ~ 50 DEG C after end capping reaction and add appropriate neutralizer neutralize in reactor, make degree of neutralization be 80 ~ 160%;

    (5) emulsion reaction;

    the solid content according to 20 ~ 40% at the uniform velocity adds deionized water in reactor, and high speed shear emulsification decompression distillation desolvation after 0.5 ~ 1.5 hour, finally obtained the shrinkproof emulsion of terminated-type cation water-borne polyurethane.

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