苯丙/SiO_2改性UF胶制备及其对胶合板性能的影响

Preparation of urea-formaldehyde resin modified by styrene-acrylic-SiO_2 and its influence on plywood properties

为提高胶合板性能,以苯丙/Si O2作为改性剂,通过物理共混的方法制备了改性脲醛树脂(UF)胶。研究了苯丙/Si O2改性剂添加量和改性UF胶施胶量对胶合板胶合强度和阻燃性能的影响。结果表明:随着改性剂添加量和施胶量的增加,胶合板的胶合强度和阻燃性能提高明显,但过量的改性剂添加量和施胶量会使胶合强度和阻燃性能有所下降,当施胶量为220 g/m2,改性剂添加量为15%时,制备的胶合板性能较佳,胶合强度为1.63 MPa,热释放总量为12.7 MJ/m2,释烟总量为213.79 m2/m2。

In order to improve the performance of plywood,a novel urea-formaldehyde（ UF） resin was prepared through physical blending with styrene-acrylic-SiO2 as modifier. The influences of modifier content and glue spreading content on bonding strength and flame retardancy properties of plywood were investigated. The results showed that both properties were improved with the increasing of styrene-acrylic-SiO2 content and glue spreading content except for excessive addition. When the addition of styrene-acrylic-SiO2 reached 15% and the spreading content of UF resin was 220 g / m^2,the samples exhibited optimal performance with bonding strength of 1. 63 MPa,total heat release of 12. 7 MJ / m^2 and total smoke release of213. 79 m^2/ m^2.