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Process for the preparation of solutions of urea-formaldehyde resins for the impregnation and coating of carrier webs for coating the surface of wood- based panels

机译:用于浸渍和涂覆用于涂覆人造板表面的载体纤维网的脲醛树脂溶液的制备方法

摘要

A method for the preparation of hardenable urea-formaldehyde resins for use in impregnating and coating carrier webs wherein urea and formaldehyde are first reacted in the presence of an aminosulfonic acid and ammonia, additional aminosulfonic acid is added and the mixture is further reacted to adjust the viscosity of the solution and then additional ammonia and urea are added to the reaction mixture and the mixture is further reacted to adjust the viscosity thereof, and wherein a polymer formed from the monomers of the formula ##STR1## in which R.sup.1 =H or CH.sub.3,PPR.sup.2 =O,PPR.sup.3 =OH, NH.sub.2, OC.sub.n H.sub.2n+1 wherein n is a whole number from 1 to 4, OC.sub.m H.sub.2m OH wherein m is a whole number from 1 to 6, or OC.sub.m H.sub.2m OC.sub.n H.sub.2n+1, orPPR. sup.2 and R.sup.3 are both N,P Pis added in the form of an emulsion or dispersion.PPThe product obtained by this process is particularly useful for coating wood-based panels in both short-cycle as well as multi-daylight presses.
机译:一种用于浸渍和涂覆载体纤维网的可硬化脲醛树脂的制备方法,其中首先使脲和甲醛在氨基磺酸和氨的存在下反应,加入额外的氨基磺酸,并使混合物进一步反应以调节溶液的粘度,然后将另外的氨和尿素加入到反应混合物中,并使混合物进一步反应以调节其粘度,并且其中聚合物由式## STR1 ##的单体形成,其中R.sup。 1 = H或CH.sub.3,

R补充2 = O,

R补充3 = OH,NH.2,OCn H 2n + 1其中n是1到4的整数,OCm H.sub.2m OH其中m是1到6的整数,或OCm H.m.2m OCn H 2n + 1或

R。 sup.2和R.sup.3均为N,

以乳液或分散体的形式加入。

通过此方法获得的产品特别适用于涂布木质基短周期印刷机和多日印刷机中的面板。

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