The two kinds of rigid polyurethane(PU) foams were prepared with respectively adding the refined alkali lignin and alkali lignin modified by 3-chloro-1,2-epoxypropane to be instead of 15% of the polyether glycol in we...The two kinds of rigid polyurethane(PU) foams were prepared with respectively adding the refined alkali lignin and alkali lignin modified by 3-chloro-1,2-epoxypropane to be instead of 15% of the polyether glycol in weight.The indexes of mechanical performance, apparent density, thermal stability and aging resistance were separately tested for the prepared PU foams.The results show that the mechanical property, thermal insulation and thermal stability for PU foam with modified alkali lignin are excellent among two kinds of PU foams and control samples.The additions of the refined alkali lignin and modified alkali lignin to PU foam have little effect on the natural aging or heat aging resistance except for decreasing hot alkali resistance apparently.Additionally, the thermal conductivity of modified alkali lignin PU foam is lowest among two kinds of PU foams and control samples.The alkali lignin PU foam modified by 3-chloro-1,2-epoxypropane could be applied in the heat preservation field.展开更多
A bi-component alcoholysis agent containing propylene glycol(PG)and ethanolamine(ETA)was used to catalyst the degradation of the waste polyurethane rigid foam.The oligomer polyols obtained through degradation were use...A bi-component alcoholysis agent containing propylene glycol(PG)and ethanolamine(ETA)was used to catalyst the degradation of the waste polyurethane rigid foam.The oligomer polyols obtained through degradation were used as raw materials to produce recycled polyurethane rigid foam composites with lignin as reinforcing filler.The effect of alcoholysis mass ratio on degradation was investigated by analyzing the viscosity,hydroxyl content and chemical structure of the degradation products.The effect of lignin addition on the properties of regenerated polyurethane rigid foam were investigated by analyzing water absorption rate,compressive strength,porosity,thermal stability,thermal conductivity coefficient,morphology and thermal stability of the recycled polyurethane rigid foam.Results show that different mass ration of PG to ETA significantly affects the degradation of waste polyurethane rigid foam.Besides,only with the addition of appropriate amount of lignin,the regenerated polyurethane rigid foam composites can meet the Chinese national standard“rigid polyurethane foam for building thermal insulation”(GB/T21558-2008).At this point,the composite is with good mechanical and thermal prperties,including high compressive strength,excellent thermal insulation performance,complete cell morphology and good thermal stability.展开更多
以偏苯三酸酐、乙二醇或1,3-丁二醇为原料,单丁基氧化锡为催化剂,成功合成出多官能高羟值的偏苯三酸酐-乙二醇聚酯多元醇(TEPES)、偏苯三酸酐-1,3-丁二醇聚酯多元醇(TBPES)。结果显示,TE-PES的羟值、数均官能度(fn)及重均官能度(fw)分别...以偏苯三酸酐、乙二醇或1,3-丁二醇为原料,单丁基氧化锡为催化剂,成功合成出多官能高羟值的偏苯三酸酐-乙二醇聚酯多元醇(TEPES)、偏苯三酸酐-1,3-丁二醇聚酯多元醇(TBPES)。结果显示,TE-PES的羟值、数均官能度(fn)及重均官能度(fw)分别为400.0mg KOH/g、6.55、7.31,TBPES的羟值、fn及fw分别为357.2mg KOH/g、5.87、6.49,且TB-PES的分子量分布较TEPES窄。1 H NMR谱与TGA分析表明,在反应过程中二元醇与偏苯三酸酐之间不仅存在单羟基的酯化反应,也存在双羟基的酯化反应;TBPES低温热稳定性比TEPES好,而其高温热稳定性不如后者。以聚醚多元醇GR-835G、TEPES、TB-PES、多亚甲基多苯基多异氰酸酯PM-200为主要原料,制备出多种不同复配多元醇体系的60kg/m3表观密度的PU硬泡。相比单一的GR-835G体系,TEPES与GR-835G的复配体系对PU硬泡压缩模量的改善有利,且其改善效果要好于TBPES与GR-835G的复配体系。同时,TEPES的掺入会损耗一定的压缩强度,而TBPES的掺入能使压缩性能整体都有提高。展开更多
基金The key project of "11th Five-Year Plan" in Heilongjiang Province (No. GB06B501-3)
文摘The two kinds of rigid polyurethane(PU) foams were prepared with respectively adding the refined alkali lignin and alkali lignin modified by 3-chloro-1,2-epoxypropane to be instead of 15% of the polyether glycol in weight.The indexes of mechanical performance, apparent density, thermal stability and aging resistance were separately tested for the prepared PU foams.The results show that the mechanical property, thermal insulation and thermal stability for PU foam with modified alkali lignin are excellent among two kinds of PU foams and control samples.The additions of the refined alkali lignin and modified alkali lignin to PU foam have little effect on the natural aging or heat aging resistance except for decreasing hot alkali resistance apparently.Additionally, the thermal conductivity of modified alkali lignin PU foam is lowest among two kinds of PU foams and control samples.The alkali lignin PU foam modified by 3-chloro-1,2-epoxypropane could be applied in the heat preservation field.
文摘A bi-component alcoholysis agent containing propylene glycol(PG)and ethanolamine(ETA)was used to catalyst the degradation of the waste polyurethane rigid foam.The oligomer polyols obtained through degradation were used as raw materials to produce recycled polyurethane rigid foam composites with lignin as reinforcing filler.The effect of alcoholysis mass ratio on degradation was investigated by analyzing the viscosity,hydroxyl content and chemical structure of the degradation products.The effect of lignin addition on the properties of regenerated polyurethane rigid foam were investigated by analyzing water absorption rate,compressive strength,porosity,thermal stability,thermal conductivity coefficient,morphology and thermal stability of the recycled polyurethane rigid foam.Results show that different mass ration of PG to ETA significantly affects the degradation of waste polyurethane rigid foam.Besides,only with the addition of appropriate amount of lignin,the regenerated polyurethane rigid foam composites can meet the Chinese national standard“rigid polyurethane foam for building thermal insulation”(GB/T21558-2008).At this point,the composite is with good mechanical and thermal prperties,including high compressive strength,excellent thermal insulation performance,complete cell morphology and good thermal stability.
文摘以偏苯三酸酐、乙二醇或1,3-丁二醇为原料,单丁基氧化锡为催化剂,成功合成出多官能高羟值的偏苯三酸酐-乙二醇聚酯多元醇(TEPES)、偏苯三酸酐-1,3-丁二醇聚酯多元醇(TBPES)。结果显示,TE-PES的羟值、数均官能度(fn)及重均官能度(fw)分别为400.0mg KOH/g、6.55、7.31,TBPES的羟值、fn及fw分别为357.2mg KOH/g、5.87、6.49,且TB-PES的分子量分布较TEPES窄。1 H NMR谱与TGA分析表明,在反应过程中二元醇与偏苯三酸酐之间不仅存在单羟基的酯化反应,也存在双羟基的酯化反应;TBPES低温热稳定性比TEPES好,而其高温热稳定性不如后者。以聚醚多元醇GR-835G、TEPES、TB-PES、多亚甲基多苯基多异氰酸酯PM-200为主要原料,制备出多种不同复配多元醇体系的60kg/m3表观密度的PU硬泡。相比单一的GR-835G体系,TEPES与GR-835G的复配体系对PU硬泡压缩模量的改善有利,且其改善效果要好于TBPES与GR-835G的复配体系。同时,TEPES的掺入会损耗一定的压缩强度,而TBPES的掺入能使压缩性能整体都有提高。
