为了提高EPS保温材料的阻燃性能，向EPS中加入不同体积比的氯氧镁水泥（MOC），并对其性能进行研究。结果表明：EPS保温材料的力学性能随着MOC体积比的增加逐渐增大。随着MOC体积比的增加，EPS保温材料的干密度和导热系数不断增大，保温性能不断下降。纯EPS的极限氧指数（LOI）只有18.1%。随着MOC体积比的增加，EPS保温材料的LOI逐渐增大且燃烧更难，阻燃性能显著提高。当MOC体积比为9%时，EPS保温材料能够在短时间内自熄灭。随着MOC体积比的增加，EPS保温材料的燃烧性能等级从易燃的B₃级逐渐提高到不燃的A₂级。结合JG/T 536—2017中对EPS保温材料性能的要求，MOC的体积比为9%时，EPS保温材料的综合性能最优，此时EPS保温材料的抗压强度和抗拉强度分别为0.258 MPa和0.198 MPa，干密度为149 kg/m³，导热系数为0.055 3 W/（m·K），阻燃等级达到A₂级。

In order to improve the flame retardancy of EPS insulation materials, different volume ratios of magnesium oxychloride cement (MOC) were added to EPS and its properties were studied. The results show that the mechanical properties of EPS insulation materials gradually increase with the increase of MOC volume ratio. As the volume ratio of MOC increases, the dry density and thermal conductivity of EPS insulation materials continue to increase, indicating a continuous decrease in insulation performance. The limited oxygen index (LOI) of pure EPS is only 18.1%. As the MOC volume ratio increases, the LOI of EPS insulation material gradually increases and combustion becomes more difficult, significantly improving its flame retardancy. When the MOC volume ratio is 9%, EPS insulation material can self extinguish in a short period of time. As the volume ratio of MOC increases, the combustion performance level of EPS insulation materials gradually increases from flammable B₃ level to non flammable A₂ level. Based on the requirements for the performance of EPS insulation materials in JG/T 536—2017, when the volume ratio of MOC is 9%, the comprehensive performance of EPS insulation materials is optimal. At this time, the compressive strength and tensile strength of EPS insulation materials are 0.256 MPa and 0.198 MPa, respectively, with a dry density of 149 kg/m³, a thermal conductivity of 0.055 3 W/(m·K), and a flame retardant grade of A₂.