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1.发明名称壳型用无氮木氮可溶酚醛类酚醛树脂的制造方法2.专利申请范围苯酚甲醛树脂是一种具有羟甲基反应基的可溶性酚醛树脂,并且具有溶解于溶剂的缩合度。在制造时,用克分子比为0.50～0.70在缓慢反应条件下,制造成为40%～60%的固态可溶性酚醛树脂,再加入酸木素60～40%进行混合溶解,此酸木素是采用接技法使其不含有硫化物及其它杂质的高纯度酸木素,通过混合溶解而成为一种不含有乌洛托品等氮化物的酸化剂,作为壳型用无氮木素可溶性酚醛树脂。
1. Method for producing nitrogen-free wood nitrogen-soluble phenolic novolak phenolic resin for shell type 2. Patent application The phenol formaldehyde resin is a soluble phenolic resin having a methylol reactive group and has a degree of condensation in a solvent . At the time of manufacture, the solid soluble phenolic resin which is 40% -60% is manufactured under the slow reaction condition with the molar ratio of 0.50-0.70, and mixed and dissolved by adding 60-40% of acid lignin, High-tech acid lignin, which is free of sulfides and other impurities, is mixed and dissolved to form an acidifier that does not contain nitrides such as hexamine, as nitrogen-free lignin soluble phenolic resin for shell type.