密度板的制作中工艺和流程!需要添加粘合剂吗? 添加什么粘合剂?

2025年04月05日 09:58
有3个网友回答
网友(1):

无甲醛粘合剂醋酸乙烯酯共聚物无皂乳液聚合交联网络纤维板分散保护剂

聚乙烯醇为分散保护剂,通过醋酸乙烯酯与丙烯酸丁酯进行无皂乳液共聚合,并加入功能性单体丙烯酸,形成自交联的水基乳液胶粘剂,再加入乙二醛作为外交联剂,使大分子在成膜过程中形成网状结构,以提高分子聚合物的粘接强度及耐水性研究了乳液聚合的影响因素以及乳液和乳胶膜的相关性能,测定了聚醋酸乙烯酯共聚物的结构与性能关系为了进一步提高聚醋酸乙烯酯乳液的耐水性能,将聚醋酸乙烯共聚乳液与自制脲醛树脂进行了复配,并对其的耐水性等性能进行了相应的研究 研究结果表明 1通过向聚合体系中引入高分子分散保护剂PVA,并与丙烯酸类单体共聚,采用无皂乳液聚合制得稳定的醋酸乙烯酯丙烯酸酯共聚物乳液 2无皂乳液聚合制备醋酸乙烯丙烯酸酯共聚物乳液的较佳工艺采用延迟加料法m醋酸乙烯m丙烯酸丁酯m丙烯酸=631,w碳酸氢钠=0.5-0.8%w引发剂=1.5%~1.8%,wPVA=6%~7%,反应时间5~6h,反应温度70~75℃,反应体系pH值为5.0~6.0 3硬软单体配比为1.51~21范围内,乳胶膜的成膜性能较好,同时胶粘强度较高丙烯酸丁酯的加入,使乳胶膜的耐水性随之增强,乳胶膜的拉伸强度随之减小,同时断裂伸长率随之增大 4通过液体在乳胶膜表面与水接触角大小的变化,表明共聚乳液具有一定的耐水性,加入外交联剂后,乳液分子发生了交联反应,从而使胶粘剂耐水性有很大提高 5FT-IR证实了PVAc-BA-AA中各单体单元的存在乳液流变性能测定表明乳液为非牛顿流体,有剪切变稀的特点TEM测定乳液粒子呈的球形,颗粒表面光滑,粒子分布较为均一,经测量计算乳胶粒平均粒径为200nmDSC测定共聚物玻璃化转变温度为23.2℃,表明有很好的耐寒性 6将聚醋酸乙烯酯共聚乳液用于木材的粘接方面,强度大于9MPa,表明有很强的粘接强度 以上研究表明通过无皂乳液聚合制备聚醋酸乙烯酯共聚物乳液的方法是成功的,该方法能够制备出具有无乳化剂、乳胶粒分布较为均一、表面光滑洁净的乳液乳胶膜的耐水性、耐寒性、力学性能以及表面性能较好该乳液作为纤维板工业上具有较好的应用效果

网友(2):

大多数的工厂用脲醛胶,里面含有甲醛,但是现在的工艺可以把甲醛的含量降到了很低,达到了国家规定的环保要求(E1级),甚至有的公司还达到了CARB P2阶段(E0)的要求!
E1级规定游离甲醛含量≤9mg/100g
E0级甲醛含量≤3mg/100g
(另一种计算标准:E1级≤1.5mg/L,E0≤0.5mg/L)

网友(3):

大多添加“尿筌胶”做粘合剂。

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