氧化镁活性对菱镁保温板的影响

Effect of magnesium oxide active on magnesite insulation board

以氧化镁、氯化镁和发泡剂为主要原料合成菱镁保温板,利用导热系数、抗压强度、抗折强度、体积密度、体积吸水率等技术对菱镁保温板进行分析。结果表明,菱镁保温板的抗折强度和抗压强度会随着氧化镁活性含量的增大而增大,当氧化镁活性含量大于60%时,耐冻融无气泡、空鼓、剥离现象,抗压强度≥0.40MPa,抗折强度≥0.20MPa,即满足保温板要求。综合考虑,氧化镁活性含量在60%～65%为最佳选择。

A magnesite insulation board synthesized from magne- sium oxide, magnesium chloride and foaming agent. The prod- ucts were charactered with thermal conductivity, compressive strength, bending strength, volume density, volume water ab- sorption. The results indicated that the compressive and flexur- al strength increased along with the increase of active content of magnesium oxide. When active content of magnesium oxide was more than 60% ,the board resistance to freezing and thawing, without air bubbles and hollowing and peeling phenomenons. The compressive strength ≥0.40 MPa and flexural strength ≥0.20 MPa, that meet the requirements of the insulation＇board. The optimum active content of magnesium oxide was 60-65%.