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METHOD FOR THE PRODUCTION OF UREA FORMALDEHYDE RESIN PAPERS WITH IMPROVED COLD ADHESIVE FORCED FOR SPATCHPLANT PRODUCTION

机译：用分水岭生产用改良的冷胶强制性生产尿素甲醛树脂纸的方法

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Prodn. of urea-formaldehyde resin adhesives comprises first precondensing urea and HCHO in a molar ratio of 1:1.8-2.2 at 100-140 degrees C and elevated pressure in the presence of 0.5-5 wt.% (based on urea) of an acid (esp. HCOOH) for 10-100 min. to form a precondensate with a predetermined viscosity. The precondensate is neutralised or made weakly basic and condensn. is continued at 40-80 degrees C while adding urea until the final urea-HCHO molar ratio is 1:1.3-1.8. Water is opt. removed to obtain the required solids content. The adhesives are esp. useful for the mfr. of wood chipboard. They have good cold bonding properties, allowing continuous board prodn. by cold pressing to form a self-supporting rough board, which can then be passed for hot pressing without a support.

机译：产品脲醛树脂粘合剂的组成部分包括：首先在100-140摄氏度和0.5-5 wt％（基于尿素）的酸存在下，以1：1.8-2.2的摩尔比和1：1.8-2.2的比例将尿素和HCHO预缩合。尤其是HCOOH）10-100分钟。形成具有预定粘度的预缩合物。预冷凝物被中和或弱碱化和冷凝。在添加尿素的同时在40-80℃下继续进行，直到最终尿素-HCHO的摩尔比为1：1.3-1.8。选择水。去除以获得所需的固体含量。粘合剂特别是。对mfr有用。刨花板。它们具有良好的冷粘合性能，可连续生产木板。通过冷压形成自支撑的毛坯板，然后将其通过而无需支撑即可进行热压。

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公开/公告号DD139946A3

专利类型
公开/公告日1980-01-30

原文格式PDF
申请/专利权人 DRECHSEL HENRY;HOERINGKLEE WALTER;MITTAG LISA;NEUMANN REINER;OEHLER KURT;ROESSING PETER;SCHICHT RUDOLF;
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申请/专利号DD19750190419
发明设计人 DRECHSEL HENRY;HOERINGKLEE WALTER;MITTAG LISA;NEUMANN REINER;OEHLER KURT;ROESSING PETER;SCHICHT RUDOLF;
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申请日1975-12-22
分类号C09J3/16;
国家 DD
入库时间 2022-08-22 18:36:23

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