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haerdarkomposition foer karbamidharts, foerfarande foer framstaellning of haerdarkompositionen and anvaendning of this mechanical mixture with karbamidharts
haerdarkomposition foer karbamidharts, foerfarande foer framstaellning of haerdarkompositionen and anvaendning of this mechanical mixture with karbamidharts
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机译:脲树脂用硬化剂组合物,硬化剂组合物的制备方法以及该机械混合物与脲树脂的应用
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摘要
The invention relates to a pourable water-based hardener for urea resins. It comprises 1-25 wt-% of an acidifier, 10-60 wt-% of a filler, 0.5-10 wt-% of a consistency improver and 0-50 wt-% of a formaldehyde absorbing substance. The hardener composition has a dry-matter content of 35-85% and a viscosity of 2000-12,000 mPa.sec. Polyvinyl alcohol is a suitable consistency improver, and kaolin is a particularly advantageous filler. In the process for the preparation of a polyvinyl alcohol- containing hardener composition, the polyvinyl alcohol is dissolved in water, and the acidifier and the filler are then added at a temperature which is lower than the temperature at which the polyvinyl alcohol is dissolved. The hardener composition is particularly suitable for mechanical mixing with urea resins having a dry-matter content of 55-80 wt-% and a viscosity of 500-20,000 mPa.sec, especially when using a mixing technique that involves the fine distribution of the components on a joint assembly surface.
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