Oil Absorption Value Research Articles

PREPARATION AND CHARACTERIZATION OF TiO2/SERICITE COMPOSITE MATERIAL WITH FAVORABLE PIGMENTS PROPERTIES

A unique method of preparing TiO2/sericite composite particles material was investigated by coating anatase TiO2 on the surface of sericite via chemical precipitation method. The results of X-ray diffraction, scanning electron microscope, infrared spectra and X-ray photoelectron spectroscopy indicated that TiO2 coated uniformly on the surface of sericite, and Si-O-Ti chemical bonds are formed during the thermal treatment process. The hiding power of Ti/SE-CPM composite is up to 85% of TiO2 white pigments, and the oil absorption value was equal to TiO2 white pigments. All these data demonstrated that the obtained Ti/SE-CPM samples have similar excellent properties compared with anatase TiO2 white pigments. Therefore, this study provides a feasible way of reducing the usage of TiO2 while maintaining similar pigment properties, which, of course, will reduce the cost, protect our environment and has a potential application in large-scale production of white pigments.

EFFECTS OF FILLERS ON PROPERTIES OF ONE-PART POLYURETHANE SEALANTS WITH PRESENCE OF A LATENT CURING AGENT

In this study, the effects of fillers on the technological properties of polyurethane sealants and the physical and mechanical properties of air moisture curing sealants are investigated. The sequence of loading the components in the dissolver, factoring in the presence of a latent curing agent, is demonstrated. It was found that when filling within 20-80 parts weight per 100 parts weight of the pre-polymer, the general complex of physical and mechanical properties remains high. With the introduction of mineral dispersed filler, the tear strength increases, but the relative elongation at break decreases. The increase in the tensile strength occurs up to a certain limit, after which there is a decrease in the strength of the sealant. It was shown that based on the oil absorption value of the fillers, the type and the amount of a filler for the sealant can be evaluated, as oil absorption directly depends on the particle size, surface area and particle shape of the filler. It was observed that for maintaining high physical and mechanical properties of the composite and the optimum viscosity of the sealant, it is preferable to combine two kinds of fillers with different oil absorption. It was established that the application of fillers with high and low oil absorption has a positive effect on the technological and performance properties of sealants. The filler with high oil absorption contributes to the thixotropy of the sealant, while the filler with low oil absorption allows to form a more highly filled composite while preserving the high strength characteristics.

Morphologies and Properties of PET Nano Porous Luminescence Fiber: Oil Absorption and Fluorescence-Indicating Functions.

A polyethylene terephthalate nano porous luminescence fiber (PNPLF) was prepared through electrospun technology. The SEM and TEM images show that the surfaces of the fibers are covered with pores. The diameter of the fiber is 250-500 nm, and the diameter of the pores is 20-180 nm. The water and oil contact angles of PNPLF are 135° and 27°, respectively. The oil absorption value of the as-prepared PNPLF achieves 135 g/g and has a good oil absorption function. The as-prepared PNPLF has good luminescence properties and fluorescent-indicating function. Even trace amounts of oil can also cause obvious change of fluorescence intensity of PNPLF which has a good stability from 20 °C to 70 °C. The breaking stress of yarn of PNPLF reaches 117cN. Furthermore, the good mechanical properties and thermal properties of PNPLF provide important basic conditions for their wide applications.

Preparation of ground calcium carbonate-based TiO2 pigment by a two-step coating method

A two-step coating method for preparing ground calcium carbonate-based TiO2 pigment (GCTD) was proposed and studied in this paper. The tetraethoxysilane (TEOS, C8H20O4Si) was selected as Si source. Aqueous ammonia was used as precipitant in the first coating step while titanyl sulfate (TiOSO4·2H2O) was used as Ti source in the second step. The Energy dispersive spectrometer (EDS) and X-ray fluorescence (XRF) results prove that SiO2 is coated on the surface of ground calcium carbonate (GCC) particles successfully. The X-ray diffraction (XRD) and transmission electron microscopy (TEM) results demonstrate that the coated SiO2 is in the form of amorphous. The EDS, XRD, TEM and Scanning electron microscope (SEM) results show that TiO2 is coated on the surface of SiO2 coated GCC (SiO2@GCC) and TiO2 particles are composed of mixed crystal of anatase and rutile. The hiding power of obtained GCTD is significantly improved compared with ordinary composite TiO2 pigment (CTD) and close to that of anatase TiO2 (ATD). The whiteness and lightness of this GCTD are just slightly decreased compared to that of CTD and ATD. Nevertheless, its oil absorption value is some higher than that of ATD but lower than that of CTD.

Preparation of TiO2-coated barite composite pigments by the hydrophobic aggregation method and their structure and properties

We obtained hydrophobic barite (BaSO4) and rutile titanium dioxide (TiO2) particles (as raw materials) by organic surface modification. Subsequently, TiO2-coated barite composite pigments were prepared via the hydrophobic aggregation of heterogeneous particles in a water medium. The pigment properties of the TiO2-coated barite composite pigments were characterized and evaluated by determining their hiding power, oil absorption value and whiteness. The optical properties were determined by obtaining their UV-vis diffuse reflectance spectra and using the CIE-L*a*b* method. The morphology and bonding properties were investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and infrared spectroscopy (IR). The results show the similarity between the composite pigment and pure rutile TiO2: when the mass ratio of rutile TiO2 in the composite pigment was 60%, the hiding power of the TiO2-coated barite composite pigment was 90.81% of that of pure rutile TiO2. Moreover, the surfaces of the barite particles were uniformly and firmly coated by TiO2, with a hydrophobic association occurring between the hydrophobic carbon chains on the surfaces of barite and TiO2 particles.

Super-hydrophobic graphene coated polyurethane (GN@PU) sponge with great oil-water separation performance

The graphene/polyurethane (GN@PU) sponge was prepared via simple dip-coating PU sponges in graphene aqueous suspension containing cellulose nanowhiskers (CNWs), where CNWs played a vital role to facilitate the uniform graphene sheets coated on the skeletons of polyurethane sponge (PU). The super-hydrophobic GN@PU sponge was obtained by optimizing the ratio of GN and CNWs to choose the final coating suspensions of GN/CNWs mixture or pure graphene. The GN@PU sponge showed densely packed graphene sheets, contributing super-hydrophobicity to the sponge with water contact angle of 152° and a large lubricating oil absorption value of 31gg−1. The elasticity, mechanical durability, thermal and chemical stability were all found to be improved after coating with the thin GN layers. Moreover, the GN@PU sponges possess outstanding recyclability and stability since no decline in absorption efficiency was observed after more than 100 cycles.

新型牙膏用SiO<sub>2</sub>颗粒的制备和性能表征

以水合硅酸钠为硅源、硫酸为沉淀剂和硫酸钠为分散剂，经过两次沉淀法制备了SiO2颗粒，测量了产物的应用性能，并利用SEM、FTIR、TG和XRD对产物的形貌结构进行了表征。结果表明：经二次沉淀制备的SiO2产物吸水量46.8 mL/20g、吸油量3.42 mL/g、铜片磨损值180，可用作牙膏中的增稠剂兼摩擦剂；SEM表征显示二次沉淀SiO2比一次沉淀SiO2表面疏松，FTIR分析显示SiO2特征峰明显，XRD说明产物是非晶态无定形结构，TG和XRD分析表明产物SiO2的纯度很高。 Novel SiO2 particles were made by two-step chemical precipitation method using sodium silicate as precursor, H2SO4 as precipitator and Na2SO4 as dispersant. Morphologies and structures of these products were characterized by means of SEM, FTIR, TG and XRD. The water absorption capacity of novel SiO2 is 46.8 mL/20 g, the oil absorption value is 3.42 mL/g, and the copper abrasion value is 180, accounting for the product can be used both as thickening agent and abrasive in toothpaste. Results of SEM demonstrated the surface of particles made by two-step is rougher than that of particles made by one-step. FITR analysis showed the characteristic peaks of SiO2 are obviously. XRD indicated the novel SiO2 is amorphous structure, and TG and XRD revealed that they are high purity.

Room temperature solution spray synthesis of Bismuth Vanadate nanopigment and its utilization in formulation of industrial OEM coatings

High performance Bismuth Vanadate (BiVO4) nanopigment was synthesised in patented solution spray reactor using precursor Bi(NO3)3·5H2O and NaVO4 as precipitant in presence of Tween-80 surfactant. The functional group, crystal structure, morphology and size of BiVO4 nanopigment was analysed by FTIR, XRD, FESEM and Particle Size Analyser. Spherical particles of monoclinic BiVO4 nanopigment of average particle size 70–100 nm were obtained. Pigment properties such as oil absorption value, colour strength, opacity of BiVO4 nanopigment were determined. Robust industrial OEM coatings were formulated using BiVO4 nanopigment and acrylic polyol, melamine formaldehyde resin as polymeric binders. Physical, mechanical and chemical resistance properties of coatings were evaluated.

The Effect of Hydrated Calcium Silicate Powder on the Three Main Indexes of Asphalt

The ball mill and the organic modifier were used to modify the powder of hydrated calcium silicate. Then the modified powders were characterization by oil absorption value, IR, SEM etc. Hydrated calcium silicate powders modified before and after were added to the asphalt and the three major indexes of asphalt were tested. The results show that the oil absorption activities of calcium silicate powder decrease obviously, the oil absorption value decreased 80%. IR spectra show that the hydrated calcium silicate powder adsorbed on the surface modifier, the modified powder morphology was changed. With the increase of powder content, the penetration increases, the ductility decreases. The softening point of asphalt mixed with unmodified powder increases with the increase of powder mixed with modified powder asphalt softening point of 4% to reach the maximum, and then began to decrease.

重晶石粉末表面偶联剂改性和表征

利用自制的钛酸酯偶联剂，采用干法改性工艺，对天然重晶石表面进行改性研究，测试了改性前后重晶石吸油量、接触角、活化指数等性能指标，通过对比发现改性后重晶石表面性能有了明显改变，达到了从亲水性向疏水性的转变。粒径分布结果表明改性后颗粒未发生明显团聚现象，而通过扫描电子显微镜、热重和傅里叶变换红外光谱分析表征，观察到颗粒形貌，失重率及表面状态的变化，验证了其改性后偶联剂与重晶石的表面键合作用，并由此为基础探讨了其改性机理。 Natural barite powder was modified with the method of surface coating by self-made titanate coupling agent. The effect of modification was evaluated by the oil absorption value, contact angle, activation index, and particle size distribution. By comparison, there is significant change on the surface performance of barite after modification, from hydrophility to hydrophobicity. No obvious aggregation of particles was found by the result of particle size distribution. Through the characterization of FTIR, SEM, and thermal analysis, the change of morphology, weight loss ratio, and surface state were observed. These results verified the chemical bonding between the titanate coupling agent and the surface of barite after modification. Based on the results, the modification mechanism was discussed.

Preparation and Characterization of Barite/TiO2Composite Particles

To make full use of barite mineral and obtain a kind of composite particles material which has the property of both barite and TiO2, the composite particles material with TiO2coated on the surface of barite particle was prepared by the method of TiOSO4solution chemical hydrolysis and precipitation to form hydrolysis composite, removing the impurities of hydrolysis composite, drying, and calcination in this study. The results were evaluated by the covering power of composites. Composite structure and properties were characterized by means of XRD, SEM, FTIR, and XPS. The results showed that the surface of barite had been coated with rutile TiO2uniformly and compactly and the hiding power value and oil absorption value of the composite powder were 18.50 g/m2and 15.5 g/100 g, respectively, which had similar pigment performances to TiO2. The results also showed that it was mainly the strong chemical bond between barite and TiO2that combined them firmly in barite/TiO2composite particle (B/TCP).

Preparation of nanosized anatase TiO2-coated illite composite pigments by Ti(SO4)2 hydrolysis

Illite/TiO2 composite pigments were prepared through hydrolysis of titanium sulfate on the surface of illite particles. Some factors that influence the coating process of TiO2 were investigated in single-factor tests, and the whiteness and oil absorption value of coating products were tested. With optimized coating conditions, the whiteness and oil absorption of illite/TiO2 composite pigments can reach to 95.73% and 31.35g/100g, respectively. The crystalline phases and surface morphology of the coating products were characterized by X-ray diffraction and scanning electron microscopy. In addition, the precipitated mechanism of anatase was investigated by X-ray photoelectron spectroscopy. The results showed that the microstructure of TiO2 coating on illite substrate was mainly anatase. The uniform and dense TiO2 layers were anchored to the surface of illite by forming Ti–O–Si bond.

Preparation and mechanism of TiO2-coated illite composite pigments

TiO2-coated illite composite pigments were prepared by hydrolyzing Ti(SO4)2 on the surface of illite substrates and the products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), zeta potential analysis, and X-ray photoelectron spectroscopy (XPS), respectively. Density functional theory calculations of the energetic stability and electronic structure of illite, calcined illite, and TiO2-coated illite were used to analyze the chemical activity and bonding position between the anatase film and the illite particles. The results demonstrate that calcined illite is more suitable for metatitanic acid coating. Moreover, the surface of illite substrates is continuously coated with anatase and a chemical interaction could occur between the anatase film and the illite substrates. The whiteness, hiding power, and oil absorption value of the compound pigment are 95.73%, 97.55%, and 33.82 g/100 g, respectively.

Synthesis and characterization of fly ash-zinc oxide nanocomposite

Fly ash, generated in thermal power plants, is recognized as an environmental pollutant. Thus, measures are required to be undertaken to dispose it in an environmentally friendly method. In this paper an attempt is made to coat zinc oxide nano-particles on the surface of fly ash by a simple and environmentally friendly facile chemical method, at room temperature. Zinc oxide may serve as effective corrosion inhibitor by providing sacrificial protection. Concentration of fly ash was varied as 5, 10 and 15 (w/w) % of zinc oxide. It was found that crystallinity increased, whereas particle size, specific gravity and oil absorption value decreased with increased concentration of fly ash in zinc oxide, which is attributed to the uniform distribution of zinc oxide on the surface of fly ash. These nanocomposites can potentially be used in commercial applications as additive for anticorrosion coatings.

Study on a New-Type Antibacterial White Carbon Black

Bamboo vinegar and sulfuric acid are used as acidifier and the method of precipitation is adopted to synthesize the antibacterial white carbon black. Orthogonal experiment was carried out to investigate the influence of reaction temperature, the amount of bamboo vinegar, additive amount of polyethylene glycol, the concentration of sodium silicate and amount of priming water on the oil absorption value of white carbon black. The analysis of orthogonal experimental results shows that influence of temperature, amount of priming water and the additive amount of PEG on oil absorption value is extremely remarkable. The influence of the amount of bamboo vinegar is remarkable, but the concentration of sodium silicate is indistinctive. It is verified through experiments that the specific surface area and oil absorption value of product is high, and its antibacterial effect is good.

Preparation and Property Characterization of Talc/Phthalocyanine Blue Composite Powder

To improve the dispersion of phthalocyanine blue powder, decrease its consumption and increase the use value of talc, TPBCP (Talc / Phthalocyanine Blue Composite Powder) was prepared by liquid phase mechanochemical method. By means of paint performance test, scanning electron microscopy (SEM) and fourier transform infrared spectroscopy (FT-IR), the properties and microstructure of composite powder were characterized. The hiding power and oil absorption value of talc/phthalocyanine blue composite powder were 12.88 g/m2 and 32.50 g/100g respectively, and the International Commission on Illumination (CIE) colorimetric data L, a, and b were 44.95, 1.65 and -17.18 respectively. It was equivalent for the hiding power of composite powder to 77.6% of that of pure phthalocyanine blue with a equivalent CIE. The formation of TPBCP was marked by phthalocyanine blue particles uniformly coated on talc surface. The results showed that TPBCP had similar performances with phthalocyanine blue and could instead of phthalocyanine blue to be applied in several fields.

Study on Preparation and Properties of Precipitated Silica

In this paper silica are made in the production line and its properties are investigated. It shows that the content of SiO2 of BSZ1 is 90.24%, its specific surface area of BET is 204.70m2/g, its CTAB is 240m2/g, its oil absorption value of DBP is 2.82cm3/g, and its particle size of D50 is 5.71μm. The content of SiO2 of BSZ2 is 94.16%, its specific surface area of BET is 245.07m2/g, its CTAB is 212m2/g, its oil absorption value of DBP is 2.86cm3/g, and its particle size of D50 is 2.82μm. The content of SiO2 of BSZ3 is 92.43%, its specific surface area of BET is 355.90m2/g, its CTAB is 273m2/g, its oil absorption value of DBP is 2.70cm3/g, and its particle size D50 is 5.71μm. BSZ2 and BSZ3 are amorphous state with silanol groups on their surfaces, and they are the spherical particle with some irregular granules. BSZ1 and BSZ2 are good application in rubber as reinforcing agent.

Effect of Coupling Agent Modify Filler on the Electrical Properties of Sheet Molding Compounds

This text have studied the effect of electrical properties of sheet molding compound (SMC), by adding different amount of Aluminum hydroxide powder which was modified by titanate coupling agent. By testing oil absorption value, we can obtain the optimum dosage of coupling agent. The results showed that oil absorption value of the powder can reach minimum when the dosage of coupling agent was 2% .After the modification of aluminum hydroxide powder, the biggest amount of filled powder will increase and the volume resistivity can improve approximately 30%. When the same amount of Aluminum hydroxide powder was added, dielectric constant and dielectric loss of the modified products is less than that of unmodified.

Preparation of titanium dioxide compound pigments based on kaolin substrates

Titanium dioxide compound pigments were prepared by hydrolysis of tetrabutyl titanate on the surface of kaolin substrates. The coating processes were investigated by various factors in single-factor tests, and the products were tested by oil absorption value and whiteness. The results show that the optimum compound pigments reach a whiteness of 94.0% and an oil absorption value of 35.5 mL/100 g. The products were further characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and zeta potential analyzer. The XRD analysis indicates that the microstructure of the coating on a kaolin substrate is mainly anatase. Transmission electron microscopy images clearly reveal that the layer of TiO2 consists of randomly oriented small particles with no agglomeration outside the kaolin surface.

Surface Modification of Basic Magnesium Sulfate Whiskers

Surface modification was conducted on the basic magnesium sulfate whiskers (MSW) using sodium stearate. The modification performance was evaluated by comparing the activation index, oil absorption value, rest angle, and dispersibility in polypropylene (PP) resin prior to and after treatment. It was found that the surface properties of the whiskers were improved by sodium stearate modification. In particular, the improvement in the dispersibility in PP was significant. Surface characterization was conducted using scanning electron microscopy (SEM), thermogravimetric-differential scanning calorimetry (TG-DSC) and fourier transform infrared spectroscopy (FTIR) for the raw and modified whiskers. The results indicated the co-existence of both chemical and physical adsorptions of sodium stearate on the surfaces of MSW.