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发明公开
CN107236500A 木质素磺酸盐改性尿素-酚醛树脂的制备方法 无效 - 撤回

木质素磺酸盐改性尿素-酚醛树脂的制备方法
摘要：
本发明公开了一种木质素磺酸盐改性尿素‑酚醛树脂及其制备方法，上述尿素‑酚醛(PUF)树脂的制备方法包括：第一步，将苯酚(P)、木质素磺酸盐(LS)、第一批醛(F1)及第一批尿素(U1)加入到反应器中，升温至60～90℃反应30～100min；第二步，加入第二批醛(F2)和尿素(U2)，并通过滴加第一批碱液，控制反应温度升高至60～95℃，反应50～100min；第三步，加入第三批醛(F3)，并通过滴加第二批碱液，控制反应温度60～95℃反应40～90min；第四步，加入第三批尿素(U3)，通过加入第三批碱液，控制反应温度60～95℃，反应30～120min，调节pH值至12.5～13.5，测定粘度至一定范围内，冷却出料。
摘要（英）：

The invention discloses a lignosulfonate-modified phenol-urea-formaldehyde (PUF) resin and a preparation method thereof. The preparation method of the PUF resin comprises the following steps: 1. adding phenol (P), lignosulfonate (LS), a first batch of formaldehyde (F1) and a first batch of urea (U1) into a reactor, and heating the materials to 60-90 DEG C to perform a reaction for 30-100 minutes; 2. adding a second batch of formaldehyde (F2) and a second batch of urea (U2), dropwisely adding a first batch of alkali liquor to control the reaction temperature to increase to 60-95 DEG C, and performing a reaction for 50-100 minutes; 3. adding a third batch of formaldehyde (F3), dropwisely adding a second batch of alkali liquor to control the reaction temperature at 60-95 DEG C, and performing a reaction for 40-90 minutes; and 4. adding a third batch of urea (U3), adding a third batch of alkali liquor to control the reaction temperature at 60-95 DEG C, performing reaction for 30-120 minutes, regulating the pH value to 12.5-13.5, and performing cooling and discharging after measuring that the viscosity is within a certain range.

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