Formaldehyde scavenger for urea-formaldehyde glue and technique for producing the same

Formaldehyde scavenger for urea-formaldehyde glue and technique for producing the same

  • CN 101,486,887 A
  • Filed: 07/08/2008
  • Published: 07/22/2009
  • Est. Priority Date: 07/08/2008
  • Status: Active Application
First Claim
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1. , formaldehyde scavenger for urea-formaldehyde glue and production technique thereof mainly solve urea-formaldehyde glue adherent material and reduce the problem that formaldehyde discharges in hot pressing or other technological processs, the aldehyde technology of falling in the plywood production process also belongs to this field, this method comprises:

  • with nitrogenous compound such as various ammonium salt or urea and phosphoric acid under different mol ratio 90-145 ℃

    down the post-reacted product of reaction 0.01-10 hour (polymerization or non-polymeric phosphamide and composition thereof) dilute with water or need not water-reducible condition under, join in the urea-formaldehyde glue of different process preparation, be used for the bonding of various sheet materials and material, according to normal glue-applying technique, when impregnation and solidifying agent together add, the said composition of moisture 0.001-70% joins in the urea glue in the ratio of glue amount 0.001-60%, it is less to influence set time of virgin rubber, also synthetic polymer phosphate amine and composition dehydration back thereof can be pulverized, the solid pulverized mated formation with wood shavings or sawdust or fiber and other material maybe the solid of pulverizing is sprayed onto on the wood shavings, before mating formation wood shavings are dehumidified, make wherein water content less than 8%, applying glue hot pressing again can be produced the various artificial boards that reach the requirement of E0 level.WhereinThe consumption 0.01%-60% of the non-purifying mixture of method synthetic is all right compound in this component in accordance with regulationsS-WAT, magnesium sulfite, ammonium sulphite 0.001-5%Ammonium phosphate, ammonium sulfate, ammonium chloride (0.002-6%,Urea 0.01-6%Band side chain or not branched monobasic or polyphenol 0-8%Sodium lignosulfonate 0.0001-13%Polyacrylamide 0.001-10%Glucose 0.001-10%

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