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在脲醛树脂(UF)的制备过程中,采用三聚氰胺对UF进行改性,制得低毒UF。结果表明:该低毒UF的固含量为49.88%,游离甲醛释放量仅为0.2026%;采用这种低毒UF胶粘剂压制的竹碎料板,其静曲强度为22.6MPa,弹性模量为2056MPa,内结合强度为0.58MPa,2h吸水厚度膨胀率为2.57%;该低毒UF是一种综合性能良好的木材用胶粘剂,其应用前景非常广阔。
In the preparation of urea-formaldehyde resin (UF), UF was modified with melamine to produce low-toxicity UF. The results show that the low toxicity UF has a solid content of 49.88% and a free formaldehyde emission of only 0.2026%. The bamboo slab pressed with the low toxicity UF adhesive has a flexural strength of 22.6 MPa and an elastic modulus of 2056 MPa , The internal bond strength of 0.58MPa, 2h absorbent thickness expansion rate of 2.57%; The low toxicity UF is a good overall performance of wood adhesives, its application prospects are very broad.