Acid and Alkali Resistance of Partially Acetylated Cotton Fabrics

1957 ◽  
Vol 27 (5) ◽  
pp. 400-411 ◽  
Author(s):  
Edith Honold ◽  
Esmond J. Keating ◽  
Evaid L. Skau
Keyword(s):  
Cotton Fabrics ◽  
Alkali Resistance ◽  
Acid And Alkali Resistance

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.

Application of Inorganic Ceramic Membrane in Wastewater Treatment I: Process Research and Parameter Optimization

2013 ◽  
Vol 454 ◽  
pp. 158-162 ◽  
Author(s):  
Guo Yi Li ◽  
Xiao Hui Wang ◽  
Yan Jie Wei
Keyword(s):  
Ceramic Membrane ◽  
High Strength ◽  
Research Direction ◽  
Research Field ◽  
Alkali Resistance ◽  
Future Research ◽  
Chemical Additives ◽  
Mechanical Metallurgy ◽  
Acid And Alkali Resistance ◽  
Automation Control

Inorganic ceramic membrane has been one of the hottest research field both in environmental protection and materials, as it has so much advantages, such as, high-temperature-resistance ,acid and alkali-resistance , adequate distribution of aperture , steady chemical property , high strength , large flux, long lifetime, anti-pollution, simple structure, small footprint, few corollary equipment, easy installation, no chemical additives, high separating efficiency, high degree of automation control and so on. Some application on environmental progress in the field of inorganic ceramic membrane technology applied in treatment of food industry wastewater, mechanical metallurgy wastewater and petrochemical wastewater was summarized in this paper, and the existent problems and the future research direction was discussed.

scholarly journals Enhancement the Properties of Construction Urea Composition with Polymer Additive

2021 ◽  
Vol 2 (2) ◽  
pp. 1-8
Author(s):  
Arslanov Islom Kimsanovich
Keyword(s):  
Structure Formation ◽  
Building Materials ◽  
Chemical Resistance ◽  
Adhesive Bond ◽  
Alkali Resistance ◽  
Scientific Article ◽  
Strength Increase ◽  
Polymer Additive ◽  
Water Binding ◽  
Acid And Alkali Resistance

This scientific article provides physicochemical studies where the addition of a gel polymer has a positive effect on the process of structure formation. The presence of chemical bonds between the components, a change in the morphology of the structure, a decrease in microporosity, an increase in the density and thermal stability of the urea composition are shown. Polymer composite materials are used as chemically resistant coatings, polymer mortars and polymer concretes. Along with such valuable properties as incombustibility, colorlessness, good miscibility with water, etc., urea resins and compositions based on them have a number of disadvantages. The object of the study is a carbamide composition with a quartz filler and an addition of a gel polymer, its structure formation and chemical resistance. The methodological basis of the study is the polystructural theory of composite building materials (CBM) and the modeling of the study of the chemical resistance of the urea composition in aggressive conditions. The issues of finding effective water-binding additives and studying their effect on structure formation, properties and technology of urea compositions remain relevant and require additional research. It is shown that with the optimal content of the gel-polymer additive in the composition of 0.13% of the filler weight, the compressive strength and specific impact strength increase by 17; 13% and shrinkage is reduced by 7%. It was found that due to the enhancement of the adhesive bond between the components and the improvement of the pore structure under the action of the gel-polymer additive, the chemical resistance of the urea composition with quartz filler increases. So, water, acid and alkali resistance are 0.75; 0.80 and 0.85 and which, respectively, are 6, 7 and 7 points higher than the reference composition.

scholarly journals Isolation of Xylanase Producing Strains, Optimization of Fermentation Conditions and Research on Enzymatic Properties

2021 ◽  
Vol 12 (2) ◽  
pp. 1
Author(s):  
Ji Huilong ◽  
Gao Xin ◽  
WU Wenxuan ◽  
Ma Zhuang ◽  
Qing Qing
Keyword(s):  
Enzyme Activity ◽  
Specific Activity ◽  
Ph Value ◽  
Fermentation Broth ◽  
Sodium Dodecyl ◽  
Alkali Resistance ◽  
Initial Ph ◽  
Acid And Alkali Resistance ◽  
Optimal Reaction Temperature ◽  
Optimization Of Fermentation

In this study, we successfully isolated a strain of Aspergillus oryzae TR08, which produced xylanase secreted to the outside of the cell productively. The enzyme activity and specific activity in the fermentation broth of this strain reached peak values of 451 IU/mL and 1963 IU/mg after 156 h of fermentation. A single factor experiment was designed, and it was found that the strain was adjusted to the initial pH of the fermentation broth to 7.5 in a shaker at 180 rpm and 32 °C. After 156 h of fermentation, the enzyme activity reached a maximum of 1264 IU/mL. The optimal reaction temperature and pH value of the xylanase were 55 °C and 7.5, respectively, and it had excellent acid and alkali resistance and a wide pH activity range. The xylanase was increased the catalytic activity by 15% in 0.25 mM Fe3+, and the biological activity of the enzyme was not affected in the sodium dodecyl sulfate environment.

scholarly journals In situ formation of Fe3O4/N-doped carbon coating on the surface of carbon fiber with improved electromagnetic wave-absorption property

RSC Advances ◽  
2020 ◽  
Vol 10 (51) ◽  
pp. 30443-30450
Author(s):  
Qilong Sun ◽  
Yue Ji ◽  
LiFen He ◽  
Xiaoyun Long
Keyword(s):  
Carbon Fiber ◽  
Carbon Coating ◽  
High Strength ◽  
Alkali Resistance ◽  
Wave Absorption ◽  
Military Equipment ◽  
Acid And Alkali Resistance ◽  
Absorbing Material ◽  
In Situ Formation

Carbon fiber is an absorbing material with high strength, acid and alkali resistance, high temperature resistance, flexibility, and processability and plays an important role in the electromagnetic (EM) wave absorption of civil buildings and military equipment.

scholarly journals Polymer Coating Effects: Study of Material Properties and Architectural Application Characteristics of Aluminum Template

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 240
Author(s):  
Fei Shuo Hung
Keyword(s):  
Building Materials ◽  
Salt Water ◽  
Salt Spray ◽  
Alkali Resistance ◽  
The Novel ◽  
Partition Walls ◽  
Acid And Alkali Resistance ◽  
Application Characteristics ◽  
Template Substrate ◽  
Resistance Tests

In construction process, the formwork must be in contact with concrete to help the concrete solidify and fix the shape. Coating the formwork with a polymer can prolong its service life by reducing the amount of concrete sticking to the mold. Herein, an aluminum template substrate was coated with polyvinylidene difluoride (PVDF) or polyurethane (PU). Aluminum template material analysis was conducted, polymer film thickness was measured, and weather, moisture, pollution, salt spray, abrasion, impact, and acid and alkali resistance tests were conducted, as were tensile, bending, adhesion, hardness, and salt water resistance tests. Cement adhesion resistance was repeatedly tested. The experimental results indicated that the PVDF-coated template was superior. The novel PVDF Aluminum template exhibited high corrosion resistance and can be used in building materials, for example, in ceilings, partition walls, curtain walls, roof panels, and roof trusses. For reference, it can also be applied to ship structures and seaside and wind power generation projects.

scholarly journals A Novel Basalt Flake Epoxy Resin Coating Modified by Carbon Nanotubes

Coatings ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 714
Author(s):  
Luo ◽  
Wang ◽  
Ma ◽  
Wang ◽  
Liu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Tensile Strength ◽  
Epoxy Resin ◽  
Alkali Resistance ◽  
Comprehensive Properties ◽  
Marine Industry ◽  
Interfacial Compatibility ◽  
Acid Environment ◽  
Acid And Alkali Resistance ◽  
New Type

As a new type of anticorrosive material, basalt flakes (BFs) have been widely used in the marine industry due to their good acid and alkali corrosion resistance and dispersion stability. In this work, the effect of carbon nanotubes (CNTs) addition on properties improvement of basalt flake epoxy resin (CNT-BF/EP) coating was studied. Firstly, 0–0.7 wt.% acidified CNTs was used to modify the surface of the BFs and the CNT-BF/EP coating was successfully prepared. Experimental results showed that the performance of the interfacial compatibility, the tensile strength, and acid and alkali resistance of the CNT-BF/EP coating were significantly improved with the addition of the CNTs. Particularly, the CNT-BF/EP coating achieved the best comprehensive properties (tensile strength increased to 30.3 MPa, surface weight loss rate of only 1.0 wt.% in the acid environment for 480 h, and water absorption of only 1.1 wt.% after 480 h) when the CNTs addition reached 0.5 wt.%. This work suggests a feasible way to enhance the mechanical properties and chemical durability of the basalt flakes coating.

Preparation and Desorption Performance of Gelatin Microspheres

2013 ◽  
Vol 664 ◽  
pp. 609-613
Author(s):  
Xue Chuan Wang ◽  
Xiao Li Hao ◽  
Tao Tao Qiang
Keyword(s):  
Adsorption Process ◽  
Crosslinking Agent ◽  
Alkali Solution ◽  
Raw Material ◽  
Alkali Resistance ◽  
Regeneration Ability ◽  
Gelatin Microspheres ◽  
Desorption Process ◽  
Acid And Alkali Resistance ◽  
Regeneration Effect

A novel microspheres adsorbent was prepared by the emulsion-congealed crosslinking method. The gelatin was as raw material and glutaraldehyde was as the crosslinking agent. The product was characterized by AFM, Zeta Potential Tester and SEM. These results showed that there were some irregular protuberances and grooves on the surface of gelatin microspheres. The relative surface roughness namely Ra was equal to 2.469E+01nm. The isoelectric point of gelatin microspheres was 3.2. Their morphology was almost not affected by treatment of the acid and alkali, and the performance of the acid and alkali resistance was superior. The result of desorption experiment showed that the regeneration ability of gelatin microspheres was stronger in the alkali solution than that in the distilled water. The optimum desorption temperature was 30°C. The desorption process got to balance for 80min. The desorption rate got to 88% in the alkali solution and regeneration effect was obvious. The result of the second-adsorption experiment showed that the desorbed adsorbent which was used in the second-adsorption experienced the same as the first-adsorption process. And the saturated adsorption capacity changed a little. So the gelatin microspheres can be recycled.

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