CAJ | 학술논문

实验过程采用热压浸渍加入发泡剂方法制备发泡型SiO2气凝胶核/聚苯乙烯壳复合珠粒,当加入14份发泡剂珠粒在90℃、压力0.9 MPa条件下反应9 h制备得到发泡剂含量为7％左右的可发性复合珠粒。同时对其发泡成型的原理、工艺流程、影响因素及参数控制等进行了研究,实验结果表明,在蒸汽压力为0.4 MPa的条件下经40 s制备得到发泡倍率为20左右、密度为0.025 g/cm3的预发复合珠粒,再经过模塑蒸汽发泡,蒸汽压力0.35 MPa、通气时间180 s,最终制备出保温性能优异(导热系数可达0.026 W/( m·K))、力学性能良好的SiO2气凝胶核/聚苯乙烯壳复合保温板。
실험과정채용열압침지가입발포제방법제비발포형SiO2기응효핵/취분을희각복합주립,당가입14빈발포제주립재90℃、압력0.9 MPa조건하반응9 h제비득도발포제함량위7％좌우적가발성복합주립。동시대기발포성형적원리、공예류정、영향인소급삼수공제등진행료연구,실험결과표명,재증기압력위0.4 MPa적조건하경40 s제비득도발포배솔위20좌우、밀도위0.025 g/cm3적예발복합주립,재경과모소증기발포,증기압력0.35 MPa、통기시간180 s,최종제비출보온성능우이(도열계수가체0.026 W/( m·K))、역학성능량호적SiO2기응효핵/취분을희각복합보온판。
In the process of experiment, expandable SiO2 aerogel core/polystyrene shell beads were prepared by adding foaming agent and being impregnated in hot-pressing. Under the conditions of adding 14 phr foaming agent at 90 ℃ and reaction for 9 h at a pressure of 0. 9 MPa, the prepared expandable composite beads foaming agent content were about 7%. The process flow of foam molding was studied, including the influence factors and the parameters of control principle. The experimental results showed that the expandable beads’ density was 0. 025 g/cm3 and the foaming ratio reached 20. After the pre-foaming experiment, the pre-foaming beads can be used to prepare the insulation board at the conditions of 0. 35 MPa steam pressure and 180 s processing time in the foaming box. The final insulation boards’ thermal conductivity was down to 0. 026 W/( m · K ) and the boards had excellent mechanical properties too.