Formaldehyde-reduced dispersion of microcapsules made from melamine-formaldehyde resin

Formaldehyde-reduced dispersion of microcapsules made from melamine-formaldehyde resin

  • CN 101,205,310 B
  • Filed: 12/06/2007
  • Issued: 09/19/2012
  • Est. Priority Date: 12/06/2006
  • Status: Active Grant
First Claim
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1. method for preparing dispersion of microcapsules;

  • Comprise;

    under the pH of 3-6.5;

    In the presence of protective colloid;

    With trimeric cyanamide;

    formaldehyde;

    the mol ratio of methyl alcohol is that the melamine formaldehyde resin dispersed therein of 1;

    3.0;

    2.0 to 1;

    6.0;

    4.0 part methylization has condensation in the water of the water-fast material basically that forms the capsule core;

    Under 20-50 ℃

    temperature, form microcapsule in advance, and solidify capsule wall down in>

    50 ℃

    to 100 ℃

    then, wherein in solidification process, adding calcium salt/trimeric cyanamide weight ratio is 20;

    1 to 1;

    20 the calcium salt and the mixture of trimeric cyanamide.

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