The technology parameters of P-RC APMP process of the triploid of populus tomentosa and the comparison of P-RC APMP with one and two stage of pretreatment were investigated in this paper. The results showed that in th...The technology parameters of P-RC APMP process of the triploid of populus tomentosa and the comparison of P-RC APMP with one and two stage of pretreatment were investigated in this paper. The results showed that in the chemical pretreatment the charge of NaOH and H2O2 were the main factors that affected the pulp qualities. The charge of NaOH, especially in the first stage of chemical pretreatment, was related to pulp strength. The charge of H2O2 contributed much to brightness of the resultant pulp. In addition, the ratio of NaOH to H2O2 and the distribution of chemicals in the first and second stage of impregnation also affected the pulp qualities. The comparison of one-stage P-RC APMP pulp and two-stage P-RC APMP pulp illustrated that the two-stage pulp had better brightness and breaking length, lower light scatting coefficient and展开更多
This study examines the development of loose-fill thermal insulation materials derived from annual plant residues,such as wheat straw,water reeds,and corn stalks,processed using the chemimechanical pulping(CMP)techniq...This study examines the development of loose-fill thermal insulation materials derived from annual plant residues,such as wheat straw,water reeds,and corn stalks,processed using the chemimechanical pulping(CMP)technique.The chopped plants were soda-cooked for 30 min,varying NaOH concentration(2%–8%on a dry basis of biomass),and mechanically refined using different disc types.The CMPprocess enhances the homogeneity and stability of defibratedmaterial,yielding improved insulation properties compared to untreated chopped rawmaterials.Chemical analysis revealed that CMP increases cellulose content and reduces lignin levels,enhancing water retention and vapor diffusion properties.Settlement tests confirmed that CMP materials are more resistant to compaction under vibration,maintaining long-term performance.Additionally,the CMP enables the production of lightweight materials that require less resource consumption while achieving comparable thermal insulation performance.The investigated biobased materials offer a sustainable alternative to conventional insulation,with competing thermal conductivity values(0.041-0.046 W/mK)at the settlement-resistant bulk density level of 60 kg/m^(3).The thermal conductivity of CMP materials remains minimally affected.However,the resulting fibers demonstrate significant advantages in stability and material efficiency.This highlights its suitability for loose-fill applications to improve the sustainability of the construction.Using renewable plant residues,CMP-based insulation materials align with circular economy principles and contribute to environmental sustainability.This research underscores the potential of CMP materials to reduce greenhouse gas emissions,optimize resource use,and promote eco-friendly building practices.展开更多
文摘The technology parameters of P-RC APMP process of the triploid of populus tomentosa and the comparison of P-RC APMP with one and two stage of pretreatment were investigated in this paper. The results showed that in the chemical pretreatment the charge of NaOH and H2O2 were the main factors that affected the pulp qualities. The charge of NaOH, especially in the first stage of chemical pretreatment, was related to pulp strength. The charge of H2O2 contributed much to brightness of the resultant pulp. In addition, the ratio of NaOH to H2O2 and the distribution of chemicals in the first and second stage of impregnation also affected the pulp qualities. The comparison of one-stage P-RC APMP pulp and two-stage P-RC APMP pulp illustrated that the two-stage pulp had better brightness and breaking length, lower light scatting coefficient and
基金funded by the LatvianCouncil of Science,the project“Investigation of Eco-Friendly Thermal Insulation Materials from Sustainable and Renewable Industrial Crops Residuals,”number lzp-2021/1-0599.
文摘This study examines the development of loose-fill thermal insulation materials derived from annual plant residues,such as wheat straw,water reeds,and corn stalks,processed using the chemimechanical pulping(CMP)technique.The chopped plants were soda-cooked for 30 min,varying NaOH concentration(2%–8%on a dry basis of biomass),and mechanically refined using different disc types.The CMPprocess enhances the homogeneity and stability of defibratedmaterial,yielding improved insulation properties compared to untreated chopped rawmaterials.Chemical analysis revealed that CMP increases cellulose content and reduces lignin levels,enhancing water retention and vapor diffusion properties.Settlement tests confirmed that CMP materials are more resistant to compaction under vibration,maintaining long-term performance.Additionally,the CMP enables the production of lightweight materials that require less resource consumption while achieving comparable thermal insulation performance.The investigated biobased materials offer a sustainable alternative to conventional insulation,with competing thermal conductivity values(0.041-0.046 W/mK)at the settlement-resistant bulk density level of 60 kg/m^(3).The thermal conductivity of CMP materials remains minimally affected.However,the resulting fibers demonstrate significant advantages in stability and material efficiency.This highlights its suitability for loose-fill applications to improve the sustainability of the construction.Using renewable plant residues,CMP-based insulation materials align with circular economy principles and contribute to environmental sustainability.This research underscores the potential of CMP materials to reduce greenhouse gas emissions,optimize resource use,and promote eco-friendly building practices.
