scholarly journals Studies on the Stability, the Acid Resistance, the Alkali Resistance and the Hard Water Resistance of the Fatty Amide -N-Methyl Sulfonic Acid Natrium Salt Solutions

1957 ◽  
Vol 6 (2) ◽  
pp. 83-87
Author(s):  
Tokuzio Yoshizaki
Keyword(s):  
Sulfonic Acid ◽  
Water Resistance ◽  
Acid Resistance ◽  
Hard Water ◽  
Fatty Amide ◽  
Alkali Resistance ◽  
Salt Solutions ◽  
The Stability

The Molding Study of Polyimide Polishing Film

2008 ◽  
Vol 375-376 ◽  
pp. 288-292
Author(s):  
Xiao Cun Xu ◽  
Zhe Jun Yuan
Keyword(s):  
Water Resistance ◽  
Acid Resistance ◽  
Alkali Resistance ◽  
Substrate Thickness ◽  
Molding Method ◽  
Polyimide Substrate ◽  
Grinding Tool ◽  
Film Making ◽  
Scanning Electron ◽  
Made In

The polyimide polishing film is a kind of soft polishing films with polyimide substrate and abrasive cement. It isn't replaced by other grinding tool because of its acid resistance, alkali resistance, water-resistance, oil resistance, heat-resistance et al. The paper focuses on ascertaining the minimal substrate thickness of polishing film, selecting molding method and molding technology. Applying the skim coating processes, and using a self-made, film making device, a lab-level, making process of polyimide polishing film is developed, and the polyimide polishing films are made in a lab. Then, study the polishing films form and analyze the molding performances with scanning electron microscope, and get an effect rule of the consistency of polyamides adhesive and abrasive to polyimide polishing films form and the appropriate consistency of polyamides adhesive finally.

scholarly journals A Superhydrophobic, Antibacterial, and Durable Surface of Poplar Wood

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1885
Author(s):  
Xinyu Wu ◽  
Feng Yang ◽  
Jian Gan ◽  
Zhangqian Kong ◽  
Yan Wu
Keyword(s):  
Stearic Acid ◽  
Antibacterial Properties ◽  
Alkali Resistance ◽  
Poplar Wood ◽  
X Ray Diffraction ◽  
X Ray ◽  
Different Temperatures ◽  
Acid And Alkali Resistance ◽  
The Stability

The silver particles were grown in situ on the surface of wood by the silver mirror method and modified with stearic acid to acquire a surface with superhydrophobic and antibacterial properties. Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and X-ray energy spectroscopy (XPS) were used to analyze the reaction mechanism of the modification process. Scanning electron microscopy (SEM) and contact angle tests were used to characterize the wettability and surface morphology. A coating with a micro rough structure was successfully constructed by the modification of stearic acid, which imparted superhydrophobicity and antibacterial activity to poplar wood. The stability tests were performed to discuss the stability of its hydrophobic performance. The results showed that it has good mechanical properties, acid and alkali resistance, and UV stability. The durability tests demonstrated that the coating has the function of water resistance and fouling resistance and can maintain the stability of its hydrophobic properties under different temperatures of heat treatment.

Effect of surface acidity on the catalytic activity and deactivation of supported sulfonic acids during dehydration of methanol to DME

2020 ◽  
Vol 44 (39) ◽  
pp. 16810-16820
Author(s):  
Rosanna Viscardi ◽  
Vincenzo Barbarossa ◽  
Daniele Mirabile Gattia ◽  
Raimondo Maggi ◽  
Giovanni Maestri ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Sulfonic Acid ◽  
Water Resistance ◽  
Surface Acidity ◽  
Acid Catalyst ◽  
Acid Sites ◽  
Sulfonic Acids ◽  
Effect Of Surface

Superiorty of the supported sulfonic acid catalyst in terms of the water resistance and efficiency of the acid sites compared to the commercial reference.

Enhancing the stability and water resistance of CsPbBr3 perovskite nanocrystals by using tetrafluoride and zinc oxide as protective capsules

2020 ◽  
Vol 55 (23) ◽  
pp. 9739-9747
Author(s):  
Pengjie Song ◽  
Bo Qiao ◽  
Dandan Song ◽  
Jingyue Cao ◽  
Zhaohui Shen ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Water Resistance ◽  
Perovskite Nanocrystals ◽  
The Stability

Lithium Doping Y2O3: A Highly Efficient Solid Base Catalyst for Biodiesel Synthesis with Excellent Water Resistance and Acid Resistance

2019 ◽  
Vol 149 (9) ◽  
pp. 2433-2443 ◽  
Author(s):  
Pingbo Zhang ◽  
Xuan Chen ◽  
Chengguang Yue ◽  
Mingming Fan ◽  
Pingping Jiang ◽  
...  
Keyword(s):  
Water Resistance ◽  
Acid Resistance ◽  
Solid Base ◽  
Base Catalyst ◽  
Solid Base Catalyst ◽  
Lithium Doping ◽  
Highly Efficient ◽  
Biodiesel Synthesis

scholarly journals Preparation and Characterization of Soap-Free Vinyl Acetate/Butyl Acrylate Copolymer Latex

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 865 ◽  
Author(s):  
Yifu Zhang ◽  
Wenkai Bei ◽  
Zhiyong Qin
Keyword(s):  
Thermal Stability ◽  
Glass Transition ◽  
Vinyl Acetate ◽  
Butyl Acrylate ◽  
Water Resistance ◽  
Latex Film ◽  
Acrylate Copolymer ◽  
The Stability ◽  
Polymerization Method

The soap-free emulsion of vinyl acetate (VAc)/butyl acrylate (BA) copolymer was prepared by a semi-continuous and pre-emulsification polymerization method, using ammonium sulfate allyloxy nonylphenoxy poly(ethyleneoxy) (10) ether (DNS-86) as a reactive emulsifier. The effects of DNS-86 on the stability of the emulsion and the properties of the latex film were investigated. The infrared spectrum, thermal stability, glass transition temperature and micromorphology of latex were also studied. The results showed that the emulsion had the best stability and the conversion rate reached a maximum of 98.46% when the DNS-86 amount was 4 wt % of the total amount of monomers. Compared with the PVAc latex synthesized with octylphenol polyoxyethylene ether (10) (OP-10), the latex prepared with DNS-86 has higher thermal stability and ionic stability, whereas the latex film has better water resistance.

Improving coating properties of shellac–epoxidised-novolac blends with melamine formaldehyde resin

2017 ◽  
Vol 46 (2) ◽  
pp. 92-99 ◽  
Author(s):  
Mohammad Fahim Ansari ◽  
Gautam Sarkhel
Keyword(s):  
Metal Surfaces ◽  
Water Resistance ◽  
Coating Material ◽  
Alkali Resistance ◽  
Formaldehyde Resin ◽  
Coating Properties ◽  
Melamine Formaldehyde ◽  
Novolac Resin ◽  
Content Type ◽  
Melamine Formaldehyde Resin

Purpose The purpose of this study is to improve the coating properties of shellac–epoxidised novolac blends by treatment with melamine formaldehyde resin (MF) at ambient temperature for its use as a coating material. Design/methodology/approach Epoxidised-novolac resin was synthesised by epoxidation of novolac resin with epichlorohydrin. Novolac resin was synthesised by reaction of phenol with formaldehyde in acidic medium. Shellac was blended with the epoxidised-novolac resin in solution in varying ratios and treated the blends with MF resin in fixed ratio. Coating properties of the treated compositions were studied using a standard procedure. The compositions were characterised with Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA) and scanning electron microscopic (SEM) spectroscopy. Findings Treatment of shellac–epoxidised-novolac blends with MF resin improved water and alkali resistance of the blends, besides enhancing gloss. Gloss in all the blends was uniformly increased on treatment with MF resin. Water resistance of the blends tremendously improved after treatment with MF resin. Contact angle of the blends against water increased while decreased against ethylene glycol and dioxane. The compositions were more resistant to polar solvent than non-polar ones, suggesting that the compositions shifted to hydrophobic (lipophilic) nature on treatment with the MF resin. Research limitations/implications A specified concentration of MF resin was used in the study. Different concentrations of the MF resin can also be tried for treatment of shellac–epoxidised-novolac blends to see the effect of the resin on the blends. Practical implications Treatment of shellac–epoxidised-novolac blend with MF resin improved the coating properties of the blends. The formulation SeNB-64 is the best with high gloss, good impact, scratch hardness and water resistance, and hence can be used as coating material for metal surfaces. Originality/value Blending of shellac with epoxidised-novolac resin and treatment of the blends with the MF resin was done for the first time. The formulation SeNB-64 can be used as coating material for metal surfaces.

Studies in bile salt solutions. IV. Rile salt catalysis and inhibition of ester hydrolysis

1984 ◽  
Vol 37 (9) ◽  
pp. 1881 ◽  
Author(s):  
CJ O'Conner ◽  
RG Wallace
Keyword(s):  
Acetylsalicylic Acid ◽  
Bile Salt ◽  
Bile Salts ◽  
Ester Hydrolysis ◽  
Diethyl Acetal ◽  
Salt Solutions ◽  
Phenyl Salicylate ◽  
The Stability ◽  
Ph Range

The reactivity of 4-nitrophenyl acetate has been examined in solutions of mono-, di-, and tri-hydroxy- cholanates and their taurine and glycine conjugates. The effect of cholate solutions on the stability of acetylsalicylic acid, phenyl salicylate and benzaldehyde diethyl acetal has also been determined. At the bile salt concentrations and in the pH range of the duodenum, bile salts do not significantly influence the stability of these compounds.

Study on Acrylic Emulsion Adhesive Modified by Double Siloxane

2013 ◽  
Vol 395-396 ◽  
pp. 367-370
Author(s):  
Cai Hua Gao ◽  
Wen Lu Guo ◽  
Zhi Ming Jin
Keyword(s):  
Thermal Stability ◽  
Comparative Study ◽  
Heat Resistance ◽  
Chemical Process ◽  
Water Resistance ◽  
Orthogonal Experiment ◽  
Acrylic Emulsion ◽  
Macroscopic Properties ◽  
The Stability ◽  
Thermal Stability Of

The acrylic emulsion adhesive was modified by D4 and KH570 with chemical process, and we can get the modified product successfully via the best technology parameter which was confirmed by orthogonal experiment. The structure of acrylic was characterized by FTIR, while there was a comparative study on the macroscopic properties and thermal stability of the unmodified and modified product. The results showed that when m(D4):m(KH570) was 2:1, the dosage of emulsifier was 3.0%, the dosage of KPS was 4.0%, the monomer(soft and hard) ratio was 1:1, the stability of the acrylic emulsion adhesive modified by double siloxane was good, and its viscosity, water resistance, heat resistance were improved greatly.

Sign in / Sign up

Export Citation Format

Share Document