The preparation method and product of the aqueous polyurethane emulsion of water-soluble silk screen ink are peeled off in a kind of interim protection

The preparation method and product of the aqueous polyurethane emulsion of water-soluble silk screen ink are peeled off in a kind of interim protection

  • CN 103,980,453 B
  • Filed: 05/08/2014
  • Issued: 09/19/2017
  • Est. Priority Date: 05/08/2014
  • Status: Active Grant
First Claim
Patent Images

1. a kind of preparation method of the aqueous polyurethane emulsion of interim protection strippable water-soluble silk screen ink, it is characterised in that bagInclude following steps:

  • 1) raw material is weighed according to following percentage by weight:

    Polymer polyatomic alcohol 8~35%Isocyanates 3~20%Hydrophilic chain extender 0.3~3%Crosslinking agent 0.03~0.5%Chain extender 0.2~0.6%Catalyst 0.01~0.2%Antioxidant 0.01~0.2%Nertralizer 0.3~2.5%Solvent 0~50%Deionized water surplus;

    2) base polyurethane prepolymer for use as is prepared;

    The polymer polyatomic alcohol of precise and antioxidant are added and carried in agitator, the retort of thermometer, in 110 DEG C-120 DEG C, under vacuum -0.09MPa after 2 hours of dehydration, in logical N2Under protection, isocyanates and catalyst are added, in 60~90 DEG C are reacted 1~3 hour;

    Then in retort add hydrophilic chain extender, crosslinking agent, solvent, in 50~70 DEG C react 2~After 5 hours, 20~50 DEG C are cooled to, solvent dilution is added, obtains base polyurethane prepolymer for use as;

    3) aqueous polyurethane emulsion is prepared;

    Above-mentioned gained base polyurethane prepolymer for use as is all poured into high speed shear dispersion machine, under 800 r/min, add nertralizer andDeionized water mixture is emulsified, and adds chain extender and deionized water mixture carries out chain extension, obtain aqueous polyurethane breastLiquid;

    Gained aqueous polyurethane emulsion is sloughed into solvent under conditions of 0~60 DEG C and -0.1~-0.05MPa, that is, is used forThe aqueous polyurethane emulsion of strippable water-soluble silk screen ink for temporary protection;

    Described polymer polyatomic alcohol is polyether Glycols of the molecular weight 1000~4000;

    Described isocyanates includes isophorone diisocyanate, hexamethylene-diisocyanate or the one kind or many for hydrogenating MDIKind;

    Described hydrophilic chain extender is dicarboxyl half ester;

    Described crosslinking agent includes the trimethylolpropane of three-functionality-degree, the one or two of glycerine;

    The ethylenediamine of described chain extender including two degrees of functionality, butanediamine, the one or more of diamines;

    Described catalyst is dibutyl tin laurate, stannous octoate, the one or more of triethylene diamine;

    Described solventFor acetone;

    Described nertralizer is the one or more of ammoniacal liquor, NaOH or LiOH.

View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×