| 摘要 |
<p>A process is disclosed for forming bonded fibre and fibre products by utilisation of an improved process for neutralising the catalyst employed in forming the A stage phenol-aldehyde resin or condensate. This condensate is the actual bonding agent which, when incorporated in a diluted form in a binder composition and sprayed onto the fibres and subsequently heated in an oven, cures and bonds the fibres to one another. The condensate is a phenol-aldehyde condensate which is the result of reacting a phenol and an aldehyde in the presence of an alkali metal or alkaline earth metal hydroxide as catalyst to form an A stage or resole resin. The catalyst, once the reaction has been completed, is then neutralised, either before or after dilution, with an acidic lignosulphonate, or a liquor containing such material. An organic or mineral acid can be utilised in conjunction with the lignosulphonate, or lignosulphonate liquor, so as to avoid adding excessive amounts of lignosulphonate. The invention is also directed to the novel processes for forming the resin and binder composition disclosed.</p> |
