知搜-全球专利检索

  1. 登录
  2. 注册
发明公开
CN108794715A 一种复合地板用磺甲基化木质素改性尿素－酚醛树脂胶黏剂的制备方法 无效 - 撤回

一种复合地板用磺甲基化木质素改性尿素－酚醛树脂胶黏剂的制备方法
摘要：
本发明公开了一种复合地板用磺甲基化木质素改性尿素‑酚醛树脂胶黏剂的制备方法，包括：第一步：将甲醛(F)溶液、苯酚(P)、磺甲基化木质素(SAL)、尿素(U)混合，其中SAL/(SAL+P)质量比为0～50％，F/(P+U+SAL)的摩尔比为0.70～0.85，加入一定量催化剂，升温至60℃以上反应30～100min；第二步：加入甲醛溶液和尿素，使F/(P+U+SAL)的摩尔比为1.03～1.13，用碱液控制温度在60～95℃反应50～100min；第三步：加入甲醛溶液和碱液，使体系中的F/(P+U+SAL)的摩尔比变为1.05～1.20，在70℃以上反应40～90min；第四步：加入尿素使F/(P+U+SAL)的最终摩尔比为0.95～1.66，用碱液将最终溶液PH调为12.5～13.5反应，至黏度达到要求。制备的复合木板用胶黏剂适用期大于90天，压制的实木复合地板胶合板强度符合II类胶合板要求，甲醛释放量符合E0级水平。
摘要（英）：

The invention discloses a preparation method of a sulfomethylated lignin modified urea-phenolic resin adhesive for a composite floor. The preparation method comprises the following steps: step 1: mixing a formaldehyde (F) solution, phenol (P), sulfomethylated lignin (SAL) and urea (U), wherein the mass ratio of SAL/(SAL+P) is 0 to 50 percent and the mol ratio of F/(P+U+SAL) is 0.70 to 0.85; addinga certain amount of a catalyst; raising the temperature to 60 DEG C or more and reacting for 30 to 100min; step 2: adding a formaldehyde solution and the urea to enable the mol ratio of the F/(P+U+SAL) to be 1.03 to 1.13; controlling the temperature to 60 to 95 DEG C by utilizing alkali liquid and reacting for 50 to 100min; step 3: adding the formaldehyde solution and the alkali liquid to changethe mol ratio of the F/(P+U+SAL) in a system to be 1.05 to 1.20; reacting for 40 to 90min at the temperature of 70 DEG C or more; step 4: adding the urea to enable the final mol ratio of the F/(P+U+SAL) to be 0.95 to 1.66; regulating the final solution pH (Potential of Hydrogen) to be 2.5 to 13.5 by utilizing the alkali liquid and reacting until the viscosity reaches the standards. The working life of the adhesive for a composite wood plate, prepared by the invention, is greater than 90 days; the strength of compacted solid-wood composite floor veneer boards meets the requirements of II type veneer boards; the releasing amount of the formaldehyde accords with the E0-grade level.

0/0