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来源于木材、麦草、竹子和蔗渣的木质素磺酸钠与三聚氰胺、甲醛和焦亚硫酸钠合成出磺化木质素三聚氰胺甲醛超塑化剂(LSMF)。系统研究了LSMF对砂浆减水率、抗压强度、抗折强度和加速碳化深度等应用性能的影响。结果表明,使用麦草基木质素磺酸钠合成出磺化度3.663 mmol/g,特性黏度7.24 mL/g的LSMF对砂浆的减水增强性能最好。当LSMF掺量为0.7%时,砂浆减水率为21.1%。硬化砂浆28 d加速碳化深度为13 mm,空白砂浆为34.5 mm。掺加LSMF后,硬化砂浆28 d抗压强度和抗折强度分别比空白砂浆提高37%和18%。LSMF超塑化剂为木质素高效利用提供了一种新的思路。
Sulfonated lignin melamine formaldehyde superplasticizer (LSMF) was synthesized from sodium lignosulfonate derived from wood, wheat straw, bamboo and bagasse with melamine, formaldehyde and sodium metabisulfite. The effects of LSMF on the application properties of mortar such as water-reducing rate, compressive strength, flexural strength and accelerated carbonation depth were systematically studied. The results showed that the LSMF with the degree of sulfonation of 3.663 mmol / g and the intrinsic viscosity of 7.24 mL / g was the best for reducing the water loss of mortar using wheat straw sodium ligninsulfonate. When the content of LSMF is 0.7%, the water-reducing rate of mortar is 21.1%. Hardened mortar 28 d accelerated carbonation depth 13 mm, blank mortar 34.5 mm. After adding LSMF, the compressive strength and flexural strength of hardened mortar increased by 37% and 18% respectively compared with blank mortar for 28 d. LSMF superplasticizer provides a new idea for efficient use of lignin.