钢琴桦木胶合板用的胶黏剂改性制备及性能

Modified Preparation and Performance Test of Adhesive for Piano Birch Plywood

为提高钢琴桦木胶合板用胶黏剂的性能,以大豆粕或棉籽粕作为蛋白基,以尿素、制丝废水、水溶性PAE树脂作为改性材料,制备一种钢琴桦木胶合板用的黏胶材料,并对其性能进行测试。结果表明:与大豆粕作为蛋白基时相比,棉籽粕蛋白基黏胶材料的固含量、黏度得到改善,胶合强度较优;尿素可以使黏胶材料固含量、胶合强度提高,黏度减小,其中,尿素改性棉籽粕黏胶材料固含量为23.70%(质量分数),黏度为1 891 mPa·s,干胶合强度为1.308 MPa,湿胶合强度为0.525 MPa;当使用尿素和16%复合改性剂制备棉籽粕黏胶材料时,固含量为23.85%(质量分数),黏度为950 mPa·s,干、湿胶合强度分别为1.558、0.941 MPa,符合国标Ⅱ类胶合板标准,且热稳定性良好。综上,改性制备得到的胶黏剂可用于钢琴桦木胶合板,且具有一定的环保性。

In order to reduce the cost of adhesive for piano birch plywood and improve its environmental friendliness,soybean meal or cottonseed meal was used as the protein base,and urea,silk wastewater,and water-soluble PAE resin were used as modified materials to prepare adhesive materials for piano birch plywood,and multiple experiments were conducted.The results showed that,compared with soybean meal as the protein base,the solid content and viscosity of cottonseed meal protein based adhesive materials were improved,and the bonding strength was better;Urea could increase the solid content and bonding strength of adhesive materials,while reducing viscosity.Among them,urea modified cottonseed meal adhesive material had a solid content of 23.70%(mass fraction),a viscosity of 1891 mPa·s,a dry bonding strength of 1.308 MPa,and a wet bonding strength of 0.525 MPa;When using urea and 16%composite modifier to prepare cottonseed meal adhesive material,the solid content was 23.85%(mass fraction),the viscosity was 950 mPa·s,and the dry and wet bonding strengths were 1.558 MPa and 0.941 MPa,respectively,which meet the national standard for Class II plywood and have good thermal stability.In summary,this adhesive material has a good application effect in piano birch plywood and is worth promoting.