高柔性隔热软木复合材料的制备与性能

摘要

The cork composite (RC16) is prepared by using one-component moisture curing polyurethane (U030) as cork adhesive,and the cork composite exhibits excellent mechanical properties and flexibility,and its density is 0.40g/cm3.The effect of adhesive content,moisture content in cork granules,and curing condition on the thermal insulation property,flexibility,and mechanical properties of the RC16 cork was investigated.The results show that:the synthetic adhesive U030 has good compatibility and adhesion with cork granules,which can wrap the cork granules completely and distribute evenly;the mechanical properties of the cork composite exhibit first increasing and then decreasing with increasing moisture content in cork granules,and the maximum value is reached at 7.0％;with the increase of U030 content,each performance of the RC16 cork show rising firstly,and then towards a stabilizing trend,but the thermal conductivity increases correspondingly,so when U030 content is 30％,the comprehensive performance of composite is the best;the optimum curing condition of the RC16 cork is defined:curing temperature is 110℃ and curing time is 1.5h.RC16 exhibits good heat resistance,which can bear 800℃ ablation within 20s.%以单组分湿固化的聚氨酯(U030)作为胶黏剂制备的软木复合材料(RC16),密度为0.40g/cm3,具有优异的柔韧性和力学性能.考察了胶黏剂的含量、软木粒子的含水率、固化条件等因素对RC16软木隔热性能、柔韧性及力学性能的影响.结果表明:合成的胶黏剂U030与软木粒子之间具有良好的相容性和粘接性,可完全包裹软木粒子且分散均匀;材料的力学性能随着软木粒子含水率的增加呈现先提高后降低的趋势,在7.0％时达到最大值;随着U030含量的增加,RC16软木的各项性能均呈现先上升后趋于稳定的趋势,但其热导率也相应提高,当U030含量为30％时材料的综合性能最佳;确定RC16软木的最佳固化工艺条件为:固化温度110℃,固化时间1.5h;RC16软木具有良好的耐热性,可在20s内承受800℃高温烧蚀.