胶原蛋白基木材胶黏剂的制备及表征

Preparation and Characterization of Collagen based Wood Adhesive

摘要:

以制革废弃物提取的胶原蛋白水解物为原料，端异氰酸酯基聚氨酯预聚体为交联剂，通过控制胶原蛋白水解物中氨基与聚氨酯预聚体中异氰酸酯基的物质的量之比合成5种不同配方的木材胶黏剂，通过FTIR、XRD、TGA、GPC、固含量、耐水性等测定方法对其性能和结构进行了检测。结果表明：聚氨酯预聚体成功地改性胶原蛋白水解物，经改性后的胶黏剂的相对分子质量明显增大，结晶度明显降低，热稳定性显著提高，且当氨基与异氰酸酯基物质的量之比为1:1时，其耐水性最好，湿态剪切强度可达1.08 MPa（≥0.7 MPa），满足GB/T9846.3—2004标准中Ⅲ类胶合板的使用要求；且当n（—NH2）：n（—NCO）=1:1时胶黏剂的稳定性最佳，其固含量也最高，达到38.16%。

Abstract:

A collagen based adhesive was prepared by using polyurethane prepolymer as the cross-linking agent, and collagen hydrolyzate derived from tanned leather wastes as the raw material. Five different wood adhesive formulations were obtained through controlling the molar rate of the amino group and the isocyanate group. The properties and structure were measured by solid content, water resistance and modern instrument characterization. The relative molecular mass of modified adhesives was obviously increased, the crystallinity was obviously reduced and the thermal stability is improved significantly after modification. The results indicated that the water resistance was the best when the molar rate was 1:1 and the wet shear strength could reach to 1.08MPa(≥0.7MPa), which met the requirement of GB/T9846.3-2004. The solid content (38.16%) and the stability of Formulation 2 adhesive were also the optimal.