Abstract:HDI-BPA phenolic resin is synthetised by bisphenol A formaldehyde phenolic resin (BPA phenolic resin) and hexamethylene diisocy-anate (HDI) under the catalysis of dibutyltin dilaurate (DBTDL). The chemical structure and molecular weight of HDI-BPA phenolic resin are characterize by FTIR, 1H NMR, GPC and organic element analysis. The results show that HDI-BPA phenolic resin is suc-cessfully prepared and its Mw is 3376. In addition, the effects of reaction temperature, reaction time, material ratio and amount of cata-lyst on the content of isocyanate and grafting ratio in the target product are discussed. The synthesis process of HDI-BPA phenolic resin is optimize by Box-Behnken Design (BBD) in response surface methodology by establishing a quadratic regression equation of isocyanate content and grafting ratio. The optimum conditions are as follows: a reaction temperature of 32 °C, a reaction time of 55 min, a ratio of m (BPA phenolic resin), m (HDI) and m (DBTDL) of 1∶4.759∶0.012. Under this condition, the content (mass fraction) of the isocyanate group in the final product is 25.51 %, and its graft ratio is 48.929 %. Finally, a HDI-BPA phenolic resin adhesive is prepare by adding a curing agent to the HDI-BPA phenolic resin. Its maximum adhesion is 283.69 N, which is 3.7 times higher than that of BPA phenolic resin adhesives, indicating that HDI modification can significantly improve the adhesion of BPA phenolic resin to low polarity leather substrates. At the same time, the contact angle of HDI-BPA phenolic resin adhesive is 93.5°, which shows good hydrophobic properties and water resistance.

Abstract:Cyclodextrin polymers (CDPs) have both the cavity structure characteristics of cyclodextrin of hydrophobic in the interior and hydrophilic in the exterior and the characteristics of polymer stability, which are kinds of functional polymer materials with great development potential. In this paper, the cyclodextrin polymers are classified according to their structural characteristics, and their synthesis methods are introduced in detail. The application research of cyclodextrin polymers in food, catalyst, cosmetic, environment, medicine, separation and analysis technology was described. Finally, the development of cyclodextrin polymers is prospected, which provides reference for the preparation and application of new cyclodextrin polymers in the future.

Abstract:2,5-furan dicarboxylate polyesters (FDCA polyesters) are bio-based polymers prepared by 2,5-furandicarboxylic acid as mainly intermediate which derived from renewable resources. In this review, the research progress of FDCA polyesters was introduced. The performances, synthetic methods, catalysts and copolymerization modification of FDCA polyesters were discussed. The glass transition temperatures (Tg), thermal stabilities, Young’s modulus and tensile strength of FDCA polyesters are similar to those of terephthalic acid (PTA) polyesters. FDCA polyesters also possess better CO2, O2 and H2O gas barrier prop-erties than PTA polyesters. FDCA polyesters have recently gained high interests due to their excellent properties, and may be potential substitute of PTA polyesters in many fields. However, FDCA polyesters lack of toughness, which significantly hinders its industry applications. Copolymerization was widely used to improve the mechanical properties of FDCA polyesters. In most cases, the copolymer’s elongations had been enhanced, however, the Young’s modulus and Tg declined rapidly simultaneously. It is still a chal-lenge and one of the most important subjects in FDCA copolymers to improve the elongations at break and achieve a higher Young’s modulus and a higher Tg at the same time.

Abstract:The double bond was introduced on the surface of the isocyanate functionalized graphene adsorbing silver ions by in-situ polymerization. Which will next be doped with the polyurethane-acrylate emulsion. And then silver-loaded graphene/polyurethane-acrylate (IGAH/WPUA) emulsion was prepared by ultraviolet curing. The structure and properties of the composites were characterized by FTIR, XPS, XRD, TEM, SEM, antibacterial properties, mechanical properties and electrical properties. Moreover, the effect of IGAH mass fraction and illumination time of composite was investigated. The results show that the performance tends to be stable when the IGAH mass fraction is 2% (based on the mass of WPUA). After washing 144 h, the antibacterial rate against Escherichia coli and Staphylococcus aureus can still reach 99.9% and 99.5%. The volume resistivity is 1.16×107 Ω·cm, and surface resistance is 3.75×108 Ω. These confirmed that the composite material has excellent antistatic property. T10% increases from 296.51 °C of pure WPUA to 308.50 °C.

Abstract:Humic acid (HA) and starch (St) were used as raw materials, N,N'-Methylenebisacrylamide (MBAA) as cross-linking agent, Potassium persulfate/Sodium Hydrogen Sulfite (K2S2O8/NaHSO3) as the composite ini-tiator, and the humic acid/starch composite microspheres (CSM) were synthesized by inverse emulsion polymerization. Combining with response surface methodology, the effects of HA/St material ratio, K2S2O8/NaHSO3 dosage, MBAA dosage, composite emulsifier dosage and temperature on the adsorption properties of CSM were discussed. The results showed that the optimum technological conditions were as follows: m(HA): m(St)=1.51:1, K2S2O8/NaHSO3 dosage 0.6 g/0.6 g, MBAA dosage 0.6 g, composite emul-sifier dosage 1.2 g, temperature 50℃, oil-water volume ratio 3:1 and reaction time 3 h. Under these condi-tions, the removal rate of CSM for Cr(VI) (10 mg/L) reached 99.91%. The structure and morphology of CSM were characterized by FTIR and SEM. It was found that HA and St reacted successfully, CSM has regular shape and the surface was rough. The particle size distribution, crystallinity and thermal decompo-sition performance of CSM were measured by laser particle size analyzer, XRD and TGA. The results showed that the particle size distribution of CSM was uniform and the average volume diameter was 19.49μm, the crystallinity of CSM (compared with St) was reduced, and the thermal stability of CSM was good.

Abstract:In order to improve the mechanical properties of chitosan/zein composite film, chitosan solution was mixed with zein. Oleic acid (0%, 15%, 30%, 45% (w/w)) as plasticizer was added to the mixture. The particle size, zeta potential, static and dynamic rheological properties of the blend solution were analyzed. Then the effects of oleic acid on the barrier properties, mechanical properties and compatibility of the film were evaluated. The results showed that the particle size of the blend solution increased due to the addition of oleic acid. Compared with other treatments, the dispersivity of particle was better in the solution with 30% oleic acid. The value of PDI was 0.34 and particle size was 1307.5nm. With the increase of oleic acid content, the viscosity of blend solution decreased and the flow index increased. Elastic modulus and viscosity modulus of the solution increased. The mechanical properties of OA-30 film were improved. The tensile strength was up to 36.37 MPa, and the fracture elongation was up to 22.32% The barrier of membrane was enhanced. The water vapor transmittance and oxygen transmittance was reduced by 44.21% and 66.52%. OA-30 film was flat, and the chitosan and zein molecules had good compatibility. In summary, oleic acid modification improved the properties of chitosan/zein composite film.

Abstract:A series of novel fluorescent isomers were designed and synthesized by using 4-azafluoren-9-one (IP) as electron acceptor and carbazole as electron donor. The substitution position of carbazole on IP was adjusted to form IP-6-PhCz, IP-7-PhCz, IP-8-PhCz and IP-9-PhCz. The photoluminescent, electroluminescent and electrochemical properties of the four fluorescent dyes were characterized by UV absorption spectroscopy, fluorescence emission spectroscopy, electrochemical analysis. Experiment result shows that the substitution position of Cz on IP leads to different molecular conformation and determines the luminescent behavior of these isomers. The isomers IP-6-PhCz and IP-9-PhCz with larger torsion angles due to strong steric hindrance exhibited thermally activated delayed fluorescence (TADF) feature, while IP-7-PhCz and IP-8-PhCz emit only normal fluorescence. IP-7-PhCz showed higher photoluminescent quantum yields of 29% and realized the best performance with a maximum external quantum efficiency of 2.8% in organic light-emitting diode.

Abstract:2-[(2-aminoethyl)amino]-ethanesulfonic acid monosodium salt (AAS) was selected as hydrophilic chain extender. By the introduction of hydrophilic group into CA molecular through IPDI, under the catalysis of DBTDL, a kind of sulfonate waterborne cellulose acetate emulsion (SWCA) was prepared, and cast into a film. The structure and properties of SWCA and coating film were characterized by FTIR, nano-particle size analyzer, viscometer, TEM, SEM, contact angle measuring instrument, XRD and TGA. The effects of IPDI and AAS molar ratio on particle size, viscosity, surface morphology and water resistance of SWCA were investigated. The results demonstrated that when n(IPDI/AAS)=1.1, the emulsion was the most stable, and microscopic morphology was in oil-in-water (O/W) core-shell structure; the particle size and dispersion coefficient (PDI) of the emulsion were the smallest (128 nm and 0.112, respectively); Meanwhile, the apparent viscosity of the emulsion was 79.8 mP?s, and the resulting film was compact and smooth. When n(IPDI/AAS) ranged from 1.1 to 1.4, the film contact angle increased from (75.9??2?) to (110.2??2?) with the decrease of n(IPDI/AAS). In addition, microcrystalline or subcrystalline SWCA film was obtained after the modification. Compared with CA, the SWCA coating film has weaker crystallinity, and it has a microcrystalline or subcrystalline structure and has good heat resistance.

Abstract:A series of low-cost fluorine-containing co-polyimides CPI-1~CPI-4 are prepared using 2,2'-bis(trifluoromethyl)benzidine (TFMB),4,4'-Oxydianiline (ODA) and 3,3',4,4'-Diphenyl ether tetracar-boxylic acid dianhydride (ODPA) as monomers and m-cresol as a solvent. The structure of this series of fluorinated co-polyimides were characterized by infrared spectrometer, nuclear magnetic resonance spec-tromete. The series of fluorine-containing co-polyimides can be dissolved in organic solvents such as DMSO, DMAc and CHCl3 at room temperature, and have good solubility and film forming properties. The prepared film has excellent optical transparency, and the light transmittance at a wavelength of ultraviolet light of 400 nm is more than 70%.The series of fluorine-containing co-polyimides also have excellent thermal stability, the initial decomposition temperature is more than 500 ?C, the mass residual percentage at 800 ?C in N2 atmosphere is above 52%, and the glass transition temperature is in the range of 166-170 ?C.In addition,these kinds of the co-polyimide film prepared in the tensile strength of 89.8~105.3 MPa, an elastic modulus between 1.3 ~ 1.7 GPa, the elongation at break in the range of 9.7 to 18.4%, showing good mechanical properties.

Abstract:Manganese oxides are often used as catalysts or support materials for many catalytic reactions due to its many advantages, such as high activity, low toxicity, abundant resources and various synthesis methods. Herein，the recent progresses of manganese oxides catalysts for catalytic oxidation of HCHO have been summarized, the catalytic properties of single manganese oxides, doped manganese oxides and manganese oxide composites in the catalytic oxidation of formaldehyde were introduced, and the main factors that influence the catalytic properties have been reviewed in terms of morphology, structure and crystalline phase, as well as other factors. Besides, the reaction mechanisms for catalytic oxidation of for-maldehyde over some manganese oxides catalysts have also been summarized. It is indicated that future research of manganese oxides catalysts with high efficiency, economy and environmentally benign on ox-idation of HCHO should be improved the catalytic performance by increasing the number of active sites, constructing more defects, adding additives and doping modification.

Abstract:A compound N-[2-(Dimethylamino)ethyl]-2,2,2-trifluoroacetamide (NDAET) was obtained by acylation using ethyl trifluoroacetate and N,N-dimethylethylenediamine as raw materials.Then quaternization of NDAET with bromododecane to obtain a novel fluorinated quaternary ammonium salt surfactant (NDAET-12).The structure were characterized by FTIR，1 HNMR and 13 CNMR．The surface performance results showed that NDAET-12 had a high surface activity，the critical micelle concentration of the aqueous solution was 4.62?10-2mmol/L and the corresponding CMC surface tension was 24.78 mN/m.

Abstract:Abstract: Cytochrome P450s enzyme in Streptomyces roseochromogenes SIIA-1902 was used to convert prednisolone into 16α-hydroxy prednisolone by electron transfer of spouse (roseoredoxin and roseoredoxin reductase). The results showed that peroxides could replace the natural oxygen reduction pathway in a cycle known as the ‘peroxide shunt’. In a NaIO4 supported peroxide shunt reaction, the yield of 16α-hydroxy prednisolone was 23.3 mg/L, and the conversion rate of prednisolone was 12.9%. Under the same conditions, in a hydrogen peroxide supported peroxide shunt reaction, the yield of 16α-hydroxy prednisolone increased to 45.3 mg/L, and the conversion rate reached 25.1%. The peroxide shunt reaction conditions were further optimized. When the concentration of prednisolone was 0.5 mmol/L, the mass fraction of hydroxypropyl cyclodextrin was 0.2 mg/mL, and the molar ratio of prednisolone to hydrogen peroxide was 1:3, the yield of 16α-hydroxy prednisolone was up to 64.3 mg/L and the conversion rate of prednisolone was 35.7% after 24 h of reaction at pH 7.2 and 30℃. Key words：P450s; prednisolone; peroxide shunt reaction

Abstract:An endophytic strain creened from fresh cinnamon branch that can biotransform cinnamyl alcohol to synthesize natural 2-phenylethanol was identified as Sphingomonas and named Sphingomonas sp. Z45. The metabolic intermediates were traced by GC-MS, and the possible metabolic pathway was deduced as follows: cinnamyl alcohol was oxidized first, and then decarboxylated to phenylacetaldehyde, and the product 2-phenylethyl alcohol was obtained by hydrogenation reduction of phenylacetaldehyde. The effects of single factor experiment on the biotransformation system were investigated. The optimal reaction conditions were obtained as follows: initial pH = 7, 5% inoculum concentration, 20 mL medium in 150 mL flask, after 24 hours of cell culture, the substrate cinnamyl alcohol (2.5 g/L) was added, conversion temperature of 30 ℃, shaker speed 200 r/min, conversion time of 12 h. Under the optimal conditions, the conversion of cinnamon alcohol was 59.16% and the concentration of 2-phenylethanol was 1.48 g/L.

Abstract:Hydrocalumite was synthesized by the cleaning method and coprecipitation method, and then calcined at 400-800℃ to obtain a calcined hydrocalumite catalyst. The surface area, crystal structure, surface alkali strength and alkali amount were characterized by BET, XRD and CO2-TPD, respectively, and applied to the catalytic synthesis of glycerol monostearate (GMS). Among them, the surface of the calcined hydrocalumite strong base prepared by the clean method is relatively high, which has better catalytic performance, simple preparation process and high atomic utilization rate. Under the optimized reaction conditions of n (glycerol): n (methyl stearate) = 5.0:1, catalyst dosage 5% (based on the mass of fatty acid methyl ester), 200℃ and 5 h, the GMS content (periodic acid oxidation method) in the crude product was as high as 82.7%.

Abstract:A novel green process was developed for the recovery of N,N-dimethylformamide (DMF) from the acid-containing DMF solution by adding dimethylamine into the acid-containing DMF system during the “primary distillation-continuous reaction-secondary distillation” process, with N,N-dimethylacetamide (DMAC) produced as by-product. The laboratory research and the pilot-scale test were carried out. The results show: dimethylamine can break the interaction between DMF and acetic acid; the crude DMF with purity of 95% and no acid was produced during the primary distillation process, and the recovery of DMF was about 80%; the acid reacted with dimethylamine, producing DMF and DMAC, with a conversion of 96%, and the concentration of acid in the mixture was reduced to 1.4% after the reaction; the distillate with 47% DMF and the residue with 97.7% DMAC were obtained from the reaction mixture in the secondary distillation process.

Abstract:The solid acid catalyst was prepared by co-pyrolysis semi-coke with waste rubber powder and long-flame coal in Naomaohu , Xinjiang after two steps of phosphoric acid-hydrothermal coupling activation and sulfonation treatment. The conversion rate of acetic acid in the ethanol acetate esterification reaction was used as the catalytic performance index, and the effects of activation conditions and sulfonation conditions on the catalytic performance of the solid acid prepared were investigated. The results showed that the activated semi-coke obtained by activation of phosphoric acid mass fraction of 48.73%, activation temperature of 448K and activation time of 3h was sulfonated at sulfonation temperature of 423K and sulfonation time of 1 hour to obtain a solid acid catalyst. The acid amount of the solid acid catalyst is 7.2 mmol/g, wherein —SO3H is 1.30 mmol/g;The solid acid catalyst mass fraction was 9.5%, the volume ratio of ethanol to glacial acetic acid was 2:1, the reaction time was 30min, the conversion rate of glacial acetic acid was up to 81.98%.

Abstract:By the incorporation of 2,2,6,6-tetramethylpiperidineoxyl (TEMPO) radicals into 2,5-dibromobenoic acid, and further reacted with 1,3,5-triethynylbenzene through Sononashira coupling reaction, a TEMPO radical decorated conjugated microporous polymer (CMP), named CMP-3-TEMPO, was successfully synthesized. The chemical composition and structural information of CMP-3-TEMPO are characterized by SEM, XRD, FT-IR, and EPR spectra. CMP-3-TEMPO enables selective oxide a broad range of primary and secondary aromatic alcohols, and heteroatom aromatic alcohols to their corresponding aldehydes and ketones with conversion at the range of 70-100% under mild aerobic conditions (80ºC, normal atmospheres). However, the catalytic activity of CMP-3-TEMPO was significantly decreased after three catalytic cycles. The partial decomposition of CMP-3-TEMPO and the leakage of TEMPO radicals from inner might be responsible for the decreased catalytic activity.

Abstract:ZrO2 carriers with different crystalline phase structures were prepared, including monoclinic phase (m-ZrO2), tetragonal phase (t-ZrO2) and amorphous phase (a-ZrO2), then Cu/m-ZrO2, Cu/t-ZrO2, and Cu/a-ZrO2 catalysts were prepared by sedimentation method and applying for synthesis of iminodiacetic acid by dehydrogenation of diethanolamine to testing theirs performance. The structures of the catalysts were characterized by XRD, Nitrogen-physical adsorption desorption, XPS, H2-TPR and CO2-TPD. The results show that Cu/ m-ZrO2 catalysts interface is more conducive to the stable existence of Cu+/Cu0, with more alkaline sites and better oxidation resistance. In the dehydrogenation reaction of diethanolamine, Cu/m-ZrO2 catalyst had better performance, the reaction time was reduced from 5 h to 2.5 h, and the yield of iminodiacetic acid was 97.64%.

Abstract:A series of porous MoS2/Fe-g-C3N4 heterojunction composites were fabricated and their photocatalytic performance for hydrogen evolution via water splitting under visible light irradiation were measured. The 3% MoS2/Fe-g-C3N4 showed excellent photocatalytic performance and recyclability, and the rate of hy-drogen production reached to 48.2 μmol•/h which is 5.47 times of pure g-C3N4. The physicochemical properties of materials were also investigated by XRD, FTIR, SEM, TEM and XPS and the optical proper-ties were tested by PL and UV-vis. The results showed that the crystallinity of Fe-g-C3N4 decreased greatly and the Fe doped materials presented a porous structure with larger specific surface area. Furthermore, the MoS2/Fe-g-C3N4 materials showed more visible light absorption and faster electron-hole separation which was mainly because the newly-formed heterojunction.

Abstract:The acetylation modification of blackcurrant fruit polysaccharide (BP) was carried out by using acetic anhydride. The acetylated polysaccharides with low, medium and high degrees of substitution including ABP-1 (DS = 0.14±0.02) , ABP-2 (DS = 0.28±0.02) and ABP-3 (DS = 0.55±0.01) , were selected to study the effects of acetylation modification on the structural characteristics (monosaccharide composition and morphological features) and bioactivities of BP. FT-IR analysis and GC analysis confirmed that the acetylation modification had no effect on the main structure of BP, and ABP-1, ABP-2, ABP-3 contained the same monosaccharide species (galacturonic acid, rhamnose, arabinose, xylose, mannose, glucose, galactose) as those of BP but at different molar ratios. The Congo red test showed that the acetylated polysaccharides and BP had no triple helix structure, SEM analysis indicated that the surface morphology of acetylated polysaccharides was different from that of BP. The activity test results showed that the acetylated polysaccharides had strong free radical (DPPH·, OH·, O2-·) scavenging ,α-amylase and α-glucosidase inhibitory activities. The order was: BP < ABP-1 < ABP-2 < ABP-3 < positive control（Vc or acarbose）. The results of α-glucosidase inhibition kinetics showed that the inhibitory effects of BP and acetylated polysaccharides on α-amylase were reversible and exhibited a competitively inhibitory process.

Abstract:A thermoplastic fluorescent polyurethane was prepared by using polycarbonate diol (PCDL) and hexamethylene diisocyanate (HDI) as main raw materials, 1,4-butanediol (BDO) and fluorescent molecule diol N, N-dihydroxyl phenylaniline-β-terpyridine (TPPDA) as a chain extender. And the fluorescent polymer electrolyte was prepared by blending thermoplastic fluorescent polyurethane with lithium difluoromethane sulfonimide (LiTFSI). The structure, optical properties, mechanical properties, thermal stability and electrochemical properties of the prepared electrolyte were tested using a Fourier transform infrared spectrometer, a fluorescence spectrometer, a tensile tester, a synchronous thermal analyzer, an electrochemical workstation, and a battery tester. Studies have shown that as the mass fraction of lithium ion (LiTFSI) in the film increases, the fluorescence intensity increases; when the mass fraction of lithium salt is 30%, the tensile strength reaches 4.5 MPa, and the conductivity reaches 1.03?10-4 S/cm. The half-cell assembled with a fluorescent polyurethane electrolyte membrane with a lithium salt mass fraction of 30% did not undergo significant oxidative decomposition within 2 to 4.5 V, and the full battery of the specific discharge capacity reached 165 mA?h/g and 111 mA?h/g at 0.2 C and 1 C current density respectively at 80℃ and it exhibited good rate performance.

Abstract:Titanium pillared montmorillonite (Ti-MMT) was prepared by sol-gel method using sodium montmorillonite (Na-MMT) and tetrabutyl titanate as matrix materials. The Ti-MMT were characterized by XRD, FTIR and SEM. Then, the effects of different adsorption conditions on the adsorption of Ni2+ and Mn2+ on Ti-MMT were investigated, and the effect of pH on Zeta potential and adsorption was emphatically analyzed. The mechanism of Ti-MMT adsorption of Ni2+ and Mn2+ was investigated. The results show that Ti-MMT has a large interplanar spacing (d001=2.94 nm); pH has a great influence on adsorption, and the removal rate of Ni2+ and Mn2+ increases with the increase of initial pH. At pH=7, the dosage of Ti-MMT is 5 g/L, the initial mass concentration of Ni2+ is 50 mg/L, and the adsorption time is 120 min at 318 K, Ni2+ adsorption capacity can reach 9.46 mg/g, and the removal rate can reach 94.59%. At pH=7, the dosage of Ti-MMT is 9 g/L, the initial mass concentration of Mn2+ is 50 mg/L, and the adsorption time is 180 min at 318 K, Mn2+ adsorption capacity can reach 4.82 mg/g, and the removal rate can reach 86.73%. In addition, Ti-MMT adsorption of both ions is more consistent with Temkin isotherm adsorption, and the pseudo-second-order kinetics model. The adsorption process is controlled by liquid membrane diffusion and intra-particle diffusion, and ion exchange chemisorption is dominant. Thermodynamic analysis shows that the adsorption of Ni2+ by Ti-MMT belongs to the process of spontaneous endothermic entropy increase, while Mn2+ belongs to the non-spontaneous process of increasing endothermic entropy.

Abstract:A series of YBO3 samples were obtained by hydrothermal method. The microstructures, morphologies and optical properties of the samples were characterized by XRD, SEM, TEM, XPS and UV-Vis. The photocurrent and electrochemical impedance experimental were researched with CHI660E electro-chemical system and the photocatalytic activities of the samples were tested with the photocatalytic degradation of RhB. Results demonstrate that the YBO3 microspheres were self-assembled by nanosheets. Compared with the YBO3 microparticles, redshift phenomenon appears at the absorption edge for YBO-85 with the formation of nanosheets structure. Meantime, the YBO3 microspheres have strong absorption in the ultraviolet range, higher photocurrent and less carrier migration resistance. So, YBO3 microspheres can exhibit a excellent activity to photodegrade RhB under UV light irradiation. The degradation rate of RhB can reach 90.9% under 40 min irradiation time.

Abstract:Abstract:The aluminum nitrate and sodium aluminate solution were used as mainly raw materials, after adding some additive, aluminum hydroxide seed crystal was prepared in the method of neutralization. The sub-micron aluminum hydroxide was prepared by precipitation after the seed crystal was added to sodium aluminate solution. When the additive was acetic acid, the neutralization temperature was 60℃, the stir-ring speed was 400r/min, and the beginning temperature of precipitation was 60℃, the final temperature was 55℃, the total precipitation time were 48 hours, the dosage of seed crystal were 2-3%, the sub-micron aluminum hydroxide with narrow particle size distribution(D50 is about 1.8μm, D90＜3.5μm) , suitable BET(BET＜5.0m2/g) and completely morphology was prepared. Compared with the EVA retardant alu-minum hydroxide from foreign country, the particle size distribution, BET, oil absorption and morphology of both products were similar. So the aluminum hydroxide prepared in test had a chance to replace the for-eign products.

Abstract:Lignin-modified polyoxyethylene ether monomer (KL-TPEG) was prepared from lignin and unsaturated polyoxyethylene ether. A series of lignin-based polycarboxylic acid water reducers PCE-Ls with different lignin content were prepared from KL-TPEG. The structure of PCE-Ls was characterized, and the properties of PCE-Ls and PCE-B were tested by dispersibility, rheology and compressive strength of concrete. The results showed that PCE-Ls had good surface activity and air entraining properties, and the 5min foam height was >50mm, much higher than that of PCE-B 20mm. The surface tension is only 36.01 mN/m when the mass concentration is 50 g/L. Compared with the traditional Polycarboxylic Water Reducer PCE-B, the dispersion of PCE-Ls is not much different, but the initial fluidity of PCE-Ls is higher than 300 mm; the slump of PCE-Ls dispersed concrete is more than 110 mm, which has better and easier performance. The fitting model shows that PCE-Ls dispersed cement paste has lower yield stress, better stability and lower plastic viscosity.