大豆蛋白胶黏剂用于竹柳中密度纤维板试验

A experiment on Salix discolor medium density fiberboard bonded with soybean protein adhesive

以大豆蛋白胶为胶黏剂,分别采用剥皮和未剥皮的竹柳枝桠材制备中密度纤维板。探讨了枝桠材树皮与木质部的比例和纤维得浆率,研究了树皮含量、施胶量和板材密度对竹柳纤维板物理力学性能的影响,优化了板材的制备工艺参数,并与脲醛树脂胶制备的剥皮竹柳中密度纤维板进行性能对比分析。结果表明:竹柳枝桠材的树皮含量达30.5%,其纤维得浆率比剥皮枝桠材低约4%;纤维板的性能随着密度和施胶量的增加而明显提高;剥皮竹柳所制纤维板的性能优于未剥皮的,未剥皮竹柳所制纤维板在密度为0.80 g/cm3,施胶量为16%时,其物理力学性能可满足GB/T 11718—2009的要求;而剥皮竹柳所制纤维板在密度为0.75 g/cm3,施胶量为14%时即可达到国标要求;大豆蛋白胶所制纤维板性能略低于脲醛树脂所制纤维板,但基本可以满足国标要求。

Peeled or unpeeled branches of Salix discolor were employed to produce medium density fiberboard （MDF） bon- ded with soybean protein adhesive. The ratio of bark to xylem of branches and fiber pulp yield and explored. The effects of bark and adhesive contents and board density on the physical and mechanical properties of S. discolor MDF were studied. The processing parameters in MDF manufacturing were optimized, and the properties of S. discolor MDF bonded with soy- bean protein adhesive were compared with those of peeled S. discolor MDF bonded with urea-formaldehyde （UF） adhesive. The results showed that the bark content was 30.5% for unpeeled S. discolor branches, which contributed to an approxi- mate 4% drop of fiber pulp yield compared with that of peeled ones. The performance of MDF improved significantly with the increasing of board density and adhesive consumption. The properties of MDF made of unpeeled branches fiber were better than those made of peeled branches fiber. The physical and mechanical properties of MDF made of unpeeled bran- ches fiber could meet the technical requirements of GB/T 11718-2009 when the density was 0.80 g/cm^3 and the adhesive consumption was 16%. Meanwhile, MDF made of peeled branches could meet the requirements of national standard with a density and adhesive consumption as low as 0.75 g/cm^3 and 14% , respectively. Although inferior to UF adhesive, soybean protein adhesive proved to be qualified in MDF manufacturing with respect to national standard.