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    • 75. 发明授权
    • Phenolic resin and process for making same
    • 酚醛树脂及其制备方法
    • US3839251A
    • 1974-10-01
    • US26712572
    • 1972-06-28
    • GEORGIA PACIFIC CORP
    • BORNSTEIN L
    • C08G8/00B27N3/02C08G8/10C08G51/24
    • C08G8/10
    • A resin suitable for use in the caulless system of composition board manufacture is prepared by a controlled reaction of phenol with formaldehyde in the presence of small amounts of sodium hydroxide catalyst. One mole of phenol is reacted with from about 2.5 to 3.5 moles of formaldehyde in the presence of caustic soda catalyst to form a first stage resin having a viscosity of 150 300 cps at 77*F. Additional phenol in the range of 0.25 moles to 0.5 moles per mole of phenol in the initial reaction is then added as a second stage and the resin is again reacted to a viscosity of 150 to 750 centipoises. The amount of phenol added is that amount necessary to impart to particles of wood coated with the resin sufficient tack to cause them to adhere to each other and form a sheet of sufficient structural integrity and firmness to normal transfer operations in the caulless system of particle board manufacture. The resin has a pH of about 8.5 to about 10. Its cure may be accelerated by adding about 2 - 4 percent resorcinol formaldehyde resin.
    • 通过苯酚与甲醛在少量氢氧化钠催化剂存在下的受控反应制备适用于组合物板制造无腐蚀性体系的树脂。 在苛性钠催化剂存在下,1摩尔酚与约2.5至3.5摩尔甲醛反应,形成在77°F下粘度为150-300cps的第一级树脂。在0.25摩尔至0.25摩尔 然后在初始反应中加入0.5摩尔/摩尔苯酚作为第二阶段,并且树脂再次反应至150至750厘泊的粘度。 添加的苯酚的量是赋予树脂涂覆的木材的足够粘性所必需的量,使得它们彼此粘附,并且在刨花板的无残留体系中形成具有足够的结构完整性和坚固的正常转移操作的片材 制造。 树脂的pH为约8.5至约10.其固化可通过加入约2-4%的间苯二酚甲醛树脂来加速。