Search

Poly(ESA-AA-SAS-HPA) w a s synthesized by solution polymerization from epoxy succinic acid (ESA), acrylic acid (AA), sodium allyl sulfonate (SAS) and hydroxypropyl acrylate (HPA). It was characterized by FT-IR, ¹H NMR, TG and DLS. The effects of chelating pH, temperature and additive mass fraction on the washing aid performance of Poly(ESA-AA-SAS-HPA) were investigated. The results show that, compared with sodium tripolyphosphate, it has good washing aid performance, with the chelating amount of 308.7 mg/g and the calcium dispersing power of 101.5 mg/g. Poly (ESA-AA-SAS-HPA) has good synergism with sodium dodecylbenzene sulfonate (LAS), which can reduce the surface tension of the system to 45 mN/m. [ABSTRACT FROM AUTHOR]

Copyright of New Building Materials / Xinxing Jianzhu Cailiao is the property of New Building Materials Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of New Building Materials / Xinxing Jianzhu Cailiao is the property of New Building Materials Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of New Building Materials / Xinxing Jianzhu Cailiao is the property of New Building Materials Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Surfactant Detergent & Cosmetics (1001-1803) is the property of China Surfactant Detergent & Cosmetics Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The high performance hexa-carbon polycarboxylate superplasticizer was synthesized with ethylene glycol monovinyl polyoxyethylene ether and acrylic acid as raw material by free radical polymerization in aqueous solution under the hydrogen peroxide-ferrous sulfate/ascorbic acid initiator system conditions. Initial fluidity and 1 h fluidity of cement paste were taken as response values respectively, the response surface optimization process formula based on Box-Behnken design was as follows: the ratio of acid to ether was 4.90,and the hydrogen peroxide, ferrous sulfate/ascorbic acid, mercaptopropionic acid and sodiumhydroxide dosage accounted for 0.89%, 0.18%, 0.44% and 1.05% of polyether mass, respectively. Through the performance test of the validation test, the results showed that the dispersity, slurry fluidity and fluidity retention of the hexa-carbon polycarboxylate superplasticizer were significantly improved compared with the commercial tetra-carbon and penta-carbon polycarboxylate superplasticizer prepared under these optimized conditions,and had better compatibility with Xinjiang local cement, sand, stone aggregate, which will have certain engineering application value. [ABSTRACT FROM AUTHOR]

Synthetic antifreeze type polycarboxylate superplasticizer in aqueous solution with HPEG, TPEG, Acrylic acid, 2-Hy-droxyethyl acrylate, Alcohol ether functional monomer, Amide small monomers under the action of H2O2-Vc as redox initiator and 3-Mercaptopropionic acid as chain transfer agent. The effects of reaction temperature, acid ether ratio,alcohol ether ratio and the amount of chain transfer agent MPA on the properties of antifreeze type polycarboxylate superplasticizer were analyzed. The optimum synthesis process was determined: The reaction temperature is 20°C,m(H2O2): m (polyether macromonomer) =0.005:1,m(H2O2): m (Vc) =3:1, acid ether ratio is 4.0,alcohol ether ratio is 4.0,chain transfer agent MPA accounts for 0.45% of the mass of macromonomer, the reaction time is 3h and the holding time is 1 h, the synthetic antifreeze type polycarboxylate superplasticizer has good dispersion performance, slump retention performance and frost resistance. The frost resistance is particularly excellent, which can not freeze and solidify at -40°C and has good fluidity. It is suitable for winter in severe cold areas. [ABSTRACT FROM AUTHOR]

This article analyzes the mechanism of action of polycarboxylic acid superplasticizer and clay, and summarizes the research on the tolerance of polycarboxylic acid superplasticizer at home and abroad in recent years briefly. The polycarboxylic acid can be designed and adjusted in the following ways to improve the tolerance of the polycarboxylic acid superplasticizer to clay: Increase the steric hindrance of the side chain. Introduce special functional groups or structures, such as sulfonic acid groups, phosphoric acid groups, amide groups, quaternary ammonium cations, etc. Introduce polyether without polyethylene glycol structure. These methods can weaken the clay's adsorption of polycarboxylic acid to a certain extent, thus showing its tolerance to clay. At the end of the article, the problems that still need to be solved in the current research are summarized, and the future research of polycarboxylate water-reducing agent in clay tolerance is prospected. [ABSTRACT FROM AUTHOR]

The polycarboxylate superplasticizer with low molecular weight was synthesized via catalytic chain transfer copolymerization of polyethylene glycol monomethyl methacrylate (MAPEG) and methacrylic acid (MA) in this paper. Gel permeation chro matograph (GPC) tests confirmed the molecular weight of the synthesized polycarboxylate superplasticizer was as low as 7710 and the conversion rate of MAPEG 92.8%. Then adsorption experiment found that the low molecular weight polycarboxylate superplasticizer could keep continuous adsorption onto the cement particles for a long time. Finally the mortar and concrete tests indicated the low molecular weight polycarboxylate superplasticizer had a viscosity-reducing capacity in cement based materials. Meanwhile it had a long fludity retention capactiy, could keep the low-middle slumps concrete stable for at least 2h. [ABSTRACT FROM AUTHOR]

Copyright of New Building Materials / Xinxing Jianzhu Cailiao is the property of New Building Materials Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Clean Coal Technology is the property of Clean Coal Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of New Building Materials / Xinxing Jianzhu Cailiao is the property of New Building Materials Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of New Building Materials / Xinxing Jianzhu Cailiao is the property of New Building Materials Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

TPEG polyether was used to synthesize the slump-preserving polycarboxylate water-reducing agent P -1, and its structure and performance were analyzed. The best parameters for testing the molecular mass of the slump retention type polycarboxylate water reducing agent P-1 by gel chromatography were studied, and the storage stability of the slump-preserving polycarboxylate water-reducing agent P-1 was investigated. The results show that the structure of the slump retention type polycarboxylate water reducing agent P-1 is in line with expectations, and its properties of cement paste and concrete are better than those of the commercially available slump retention type polycarboxylate water reducing agents P-2 and P-3. When using gel chromatography to test the molecular mass of the slump retention type polycarboxylate water reducing agent P-1, selecta 0.1 mol/L sodium nitrate solution containing 0.05% sodium azide for flow, and the flow rate should be (0.8~1.0) mL/min. The sensitivity of the detector should be 8~16. It is recommended that the sample dissolving time is 1 min. The slump-preserving polycarboxylate water-reducing agent P-1 has good stability in molecular mass and concrete performance after being placed at room temperature for 6~12 months. [ABSTRACT FROM AUTHOR]

In this paper, slump-preserving polycarboxylate superplasticizer (GPEG-PCE) was synthesized by free radical copoly merization reaction by ethylene glycol monovinyl polyethylene glycol ether (GPEG), acrylic acid, hydroxyethyl acrylate, and the redox system is hydrogen peroxide/E51 and molecular mass regulator mercappropylic acid (MPA). Discuss the effect of raw material ratio and synthesis process on its performance. The test results showed that the best reaction process parameters of GPEG-PCE are: the initial temperature is 20 °C, the ratio of acid to ether is 1.6, the ratio of ester to ether is 3.6, and the amount of initiator (H2O2) and molecular weight regulator (MPA) are 0.40% and 0.63% of macromonomer, respectively. The reaction time is 1 h. The synthesized GPEG-PCE has better dispersibility and slump retention than the slump-retaining polycarboxylate superplasticizer synthesized by HPEG/TPEG polyether monomer. GPEG-PCE and ordinary polycarboxylate superplasticizer are compounded and applied to concrete in a certain proportion, which can make the concrete slumps slightly increased within 3 h. [ABSTRACT FROM AUTHOR]

Copyright of New Building Materials / Xinxing Jianzhu Cailiao is the property of New Building Materials Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of New Building Materials / Xinxing Jianzhu Cailiao is the property of New Building Materials Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of New Building Materials / Xinxing Jianzhu Cailiao is the property of New Building Materials Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Surfactant Detergent & Cosmetics (1001-1803) is the property of China Surfactant Detergent & Cosmetics Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The polycarboxylate and polyoxyethylene ether phosphate composite system is beneficial to improve the physical stability of pesticide aqueous suspensions. In this study, tebuconazole 430 g/L suspension concentrate (SC) was selected as the research object. The micelle hydrodynamic diameter of the polycarboxylate dispersant 850 and the polyoxyethylene ether phosphate dispersant 601p composite system and their effects on the viscosity, zeta potential, specific absorbance and rheological properties of tebuconazole were studied in detail. The results showed that the dispersion stability of tebuconazole SC prepared using 601p alone was higher than that using 850. And the stabilities of tebuconazole SC prepared by the above mentioned two composite systems were significantly higher than that of the single dispersant. Further studies demonstrated that the proportion of dispersant system also had influence on the physical stability of tebuconazole SC. When m(850) : m(601p) = 1 : 1, the micelle dynamic diameter of the composite dispersant is stable, and the prepared tebuconazole SC has the best dispersion stability. Specifically it exhibited a relatively small viscosity, and the zeta potential is –40.8 mV. [ABSTRACT FROM AUTHOR]

This work investigated the design and conversion of a research-based comprehensive chemistry experiment in laboratory. The preparation and characterization of carboxylate vanadyl complex is a routine synthetic method in the scientific research on bio-inorganic chemistry. Through the study and optimization all the steps of the experiment which uses the aromatic carboxylic acid to react with the vanadium raw materials, the best experiment conditions, the most efective handling methods and the appropriate reaction time were obtained. The experiment could satisfy the requirements of the stability and reproducibility in teaching experiment. And the carboxylate vanadyl complex products were characterized by the infra-red spectrum (IR) and thermogravimetric analysis (TGA). Through this comprehensive experiment, the students could consolidate the principle of complex preparation, understand and grasp the working principle and operation skiil of the rotary evaporator, microwave oven, infrared spectroscopy and thermogravimetric analyzer, and develop their comprehensive ability including the related chemical basic knowledge, experimental operation, instrument analysis and relevant scientific literacy and research ability. [ABSTRACT FROM AUTHOR]