改性豆粕胶黏剂压制稻草板的研究

利用改性豆粕胶黏剂压制稻草板，可以有效缓解木材资源紧张的情况；采用正交实验方法考察了施胶量、热压时间、热压温度对不同配方改性的豆粕胶黏剂压制的稻草板的主要物理力学性能的影响，检测了稻草板的静曲强度和内结合强度；应用旋转粘度计，测定醋丙乳液改性豆粕胶黏剂的黏度。结果表明：改性豆粕胶黏剂的黏度均处于3000～8000 mPa·s范围内。在施胶量为30%时，利用稻草粒径在1.0～20 mm范围内的稻草刨花所压制出的稻草刨花板的静曲强度为14.23 MPa，内结合强度为0.43 MPa，其强度符合GB/T 21723—2008的要求。可见，施胶后的草片接触角明显减小，施加改性豆粕胶的稻草疏水性减弱；施胶后稻草的浸润性显著增强，稻草刨花彼此之间能形成良好的胶接效果。

Study on Modified Soybean Meal Adhesive for Pressing Straw Board

Using the modified soybean meal adhesive to press straw board can effectively alleviate the shortage of wood resources. The effects of sizing amount, hot pressing time and hot pressing temperature on the main physical and mechanical properties of the straw board pressed with different formulations of modified soybean meal adhesive were investigated by orthogonal experiment, and the static bending strength and internal bonding strength of straw board were tested. The viscosity of soybean paste adhesive modified by vinyl acetate emulsions was determined by rotating viscometer. The results showed that the viscosity of modified soybean meal adhesive was in the range of 3000–8000 mPa∙s. When the sizing amount is 30%, the static bending strength and internal bonding strength of the rice straw particleboard are 14.23 MPa and 0.43 MPa respectively when the size of rice straw particleboard is in the range of 1.0–20 mm. The strength of the rice straw particleboard meets the requirements of GB/T 21723—2008. The contact angle was measured by measuring angle method. After sizing, the contact angle of straw decreased significantly, which indicated weakened hydrophobicity of the straw. The wettability of rice straw increased significantly after sizing, which indicated that rice straw shavings could bonding effectively with each other.