A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Low-surface-tension shrinkage-reducing type polycarboxylate superplasticizer
The invention relates to a low-surface-tension shrinkage-reducing polycarboxylate superplasticizer. A specific preparation method for the polycarboxylate superplasticizer comprises the following steps: adding methacrylic acid and an emulsifier OP-10 into a container, conducting reacting for 4 hours, carrying out reduced-pressure distillation, and conducting cooling for later use; weighing an aqueous solution of an initiator, adding the aqueous solution of the initiator into a container containing an allyl polyoxyethylene ether macromonomer, conducting stirring and heating for 10 minutes, adding an aqueous solution of a chain transfer agent, preserving heat, supplementing the aqueous solution, carrying out cooling, and adjusting the pH value of a reactant to 7 by using a NaOH solution with a concentration of 45%, so as to obtain the low-surface-tension shrinkage-reducing type polycarboxylate superplasticizer. The low-surface-tension shrinkage-reducing type polycarboxylate superplasticizer can improve the rheological property and the working performance of concrete, and has good dispersing performance at the same time. According to the invention, the gas-liquid surface tension of the concrete can be substantially reduced, and the pore structure of hardened cement slurry can be improved so as to slow down the evaporation speed of water in internal pores, reduce capillary tension generated due to the water loss of capillary pores, achieve low shrinkage effect, and realizes good consistency between a result and surface tension.
一种低表面张力、减缩型聚羧酸减水剂，具体按照以下步骤实施：将甲基丙烯酸、乳化剂OP‑10加入容器中，反应4h，减压蒸馏、冷却备用；称取引发剂水溶液加入盛有烯丙基聚氧乙烯醚大单体的容器中，搅拌加热10min，并加入链转移剂水溶液，保温后，补充待冷却后用浓度45%的NaOH溶液将反应物的pH值调至中性，即得到低表面张力、减缩型聚羧酸减水剂。本发明能够改善混凝土流变性能和工作性能，同时具有良好的分散性能；本发明能够大幅度降低混凝土气‑液的表面张力和改善硬化水泥浆体的孔结构，从而减缓了内部孔隙中水分蒸发速度，降低由于毛细孔失水而产生的毛细管张力，从而实现低收缩作用，其结果和表面张力有很好的一致性。
Low-surface-tension shrinkage-reducing type polycarboxylate superplasticizer
The invention relates to a low-surface-tension shrinkage-reducing polycarboxylate superplasticizer. A specific preparation method for the polycarboxylate superplasticizer comprises the following steps: adding methacrylic acid and an emulsifier OP-10 into a container, conducting reacting for 4 hours, carrying out reduced-pressure distillation, and conducting cooling for later use; weighing an aqueous solution of an initiator, adding the aqueous solution of the initiator into a container containing an allyl polyoxyethylene ether macromonomer, conducting stirring and heating for 10 minutes, adding an aqueous solution of a chain transfer agent, preserving heat, supplementing the aqueous solution, carrying out cooling, and adjusting the pH value of a reactant to 7 by using a NaOH solution with a concentration of 45%, so as to obtain the low-surface-tension shrinkage-reducing type polycarboxylate superplasticizer. The low-surface-tension shrinkage-reducing type polycarboxylate superplasticizer can improve the rheological property and the working performance of concrete, and has good dispersing performance at the same time. According to the invention, the gas-liquid surface tension of the concrete can be substantially reduced, and the pore structure of hardened cement slurry can be improved so as to slow down the evaporation speed of water in internal pores, reduce capillary tension generated due to the water loss of capillary pores, achieve low shrinkage effect, and realizes good consistency between a result and surface tension.
一种低表面张力、减缩型聚羧酸减水剂，具体按照以下步骤实施：将甲基丙烯酸、乳化剂OP‑10加入容器中，反应4h，减压蒸馏、冷却备用；称取引发剂水溶液加入盛有烯丙基聚氧乙烯醚大单体的容器中，搅拌加热10min，并加入链转移剂水溶液，保温后，补充待冷却后用浓度45%的NaOH溶液将反应物的pH值调至中性，即得到低表面张力、减缩型聚羧酸减水剂。本发明能够改善混凝土流变性能和工作性能，同时具有良好的分散性能；本发明能够大幅度降低混凝土气‑液的表面张力和改善硬化水泥浆体的孔结构，从而减缓了内部孔隙中水分蒸发速度，降低由于毛细孔失水而产生的毛细管张力，从而实现低收缩作用，其结果和表面张力有很好的一致性。
Low-surface-tension shrinkage-reducing type polycarboxylate superplasticizer
一种低表面张力、减缩型聚羧酸减水剂
TANG YAOHUA (author) / WANG GUANGYAN (author) / XIANG XINJIAO (author) / TANG HONGWEI (author)
2021-06-18
Patent
Electronic Resource
Chinese
IPC:
C08F
MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
,
Makromolekulare Verbindungen, erhalten durch Reaktionen, an denen nur ungesättigte Kohlenstoff-Kohlenstoff-Bindungen beteiligt sind
/
C04B
Kalk
,
LIME
/
C08K
Verwendung von anorganischen oder nichtmakromolekularen organischen Stoffen als Zusatzstoffe
,
USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES AS COMPOUNDING INGREDIENTS
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