FORFARANDE FOR FRAMSTELLNING AV ETT LIM AV UREAFORMALDEHYDHARTS, SULFITLUT OCH VATTEN

摘要

A method for the manufacture of an adhesive product suitable for use in the manufacture of wood particle board and other wood products which adhesive product includes a large proportion of the spent liquor from the sulfite pulping of lignocellulose and is readily applicable to the manufacture of particle boards using conventional apparatus and methods, and leads to the production of glued wood products of commercially acceptable properties, which meet the commercial standards for such products. According to the invention the manufactured adhesive product consists of 50-90 parts by weight of urea formaldehyde resin solids and from 10-50 parts by weight of the spent liquor dry solids basis. The adhesive product also contains as a key component from 0.2 to 4.0% by weight of ammonium ion (expressed as NHu) on a sulfite spent liquor solids basis.