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比较了面粉、膨润土及其用量对脲醛(UF)树脂胶粘剂的pH值、固含量、固化时间和胶合强度的影响,探讨了膨润土用作胶粘剂填料的可行性。研究结果表明:随着膨润土用量的增加,UF树脂胶粘剂的pH值、固化时间和固含量呈递增趋势,游离甲醛含量明显下降;随着面粉用量的增加,UF树脂胶粘剂的固含量和固化时间呈递增趋势(但增幅比膨润土体系小),pH值有所降低;用添加膨润土的UF树脂胶粘剂生产的胶合板,当w(膨润土)≤20%、施胶量为280～300 g/m2时,胶合板的湿态胶合强度(1.69 MPa)比面粉体系(1.53 MPa)和纯UF树脂胶粘剂体系(1.09 MPa)的高,其湿态胶合强度能达到GB 9 846-1988的标准,而干态胶合强度则远高于GB 9 846-1988标准。
The effects of flour, bentonite and their dosage on the pH value, solid content, curing time and bonding strength of UF resin adhesive were compared. The feasibility of using bentonite as adhesive filler was also discussed. The results showed that with the increase of the amount of bentonite, the pH value, curing time and solid content of UF resin adhesive showed an increasing trend, and the content of free formaldehyde decreased obviously. With the increase of flour content, the solid content and curing time of UF resin adhesive were The increasing tendency (but less than that of bentonite system) was the decrease of pH value. The plywood produced by UF resin adhesive with bentonite had the best performance when the content of w (bentonite) was less than 20% and the sizing amount was 280-300 g / (1.69 MPa) is higher than the flour system (1.53 MPa) and pure UF resin adhesive system (1.09 MPa), the wet gluing strength can reach the standard of GB 9 846-1988, while the dry gluing strength Much higher than the GB 9 846-1988 standard.