scholarly journals Development, Performance, and Microscopic Analysis of New Anchorage Agent with Heat Resistance, High Strength, and Full Length

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Xiaohu Liu ◽  
Zhishu Yao ◽  
Weipei Xue ◽  
Xiang Li
Keyword(s):  
Compressive Strength ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Raw Materials ◽  
Microscopic Analysis ◽  
High Strength ◽  
Full Length ◽  
Technical Problems ◽  
Silane Coupling ◽  
Different Temperatures

To solve the difficult problems of failure of pretensioned bolt supports under high ground pressure and temperature, a new kind of anchorage agent with excellent performance is developed. First, the selection and compounding of raw materials were conducted. The new anchorage agent was obtained by modifying the PET resin by mixing with a phenolic epoxy vinyl ester resin (FX-470 resin) and adding a KH-570 silane coupling agent. Then, the viscosity, thermal stability, compressive strength under different temperatures, and anchorage capacity of the new anchorage agent were tested. Moreover, the best proportion ratio of anchorage agent by mixing resin : coarse stone powder : fine stone powder : accelerator : curing agent : KH-570 = 100 : 275 : 275 : 1 : 32.5 : 1 is obtained. The test results showed that, with the addition of a KH-570 silane coupling agent, the viscosity decreased significantly, thereby solving the difficult technical problems of pretensioned bolt supports in full-length anchorage support. Compared with the conventional anchorage agent, the compressive strength of the new anchorage agent increased by 20.4, 82.5, 118.2, and 237.5% at 10, 50, 80, and 110°C, respectively, and the anchorage capacity increased by 4.7, 8.7, 40.2, and 62.9% at 30, 50, 80, and 110°C, respectively. Finally, the enhancement in compressive strength and heat-resistant mechanism are revealed through microanalysis.

Preparation of open cell rigid polyurethane foams and modified with organo-kaolin

2019 ◽  
Vol 56 (4) ◽  
pp. 435-447
Author(s):  
Guojian Wang ◽  
Tao Yang
Keyword(s):  
Compressive Strength ◽  
Polyurethane Foam ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Polyurethane Foams ◽  
Compressive Property ◽  
Rigid Polyurethane Foam ◽  
Open Cell ◽  
Silane Coupling ◽  
Cell Opening

The open cell rigid polyurethane foam (ORPUF) was prepared by adding chemical cell openers including O-500 and AK-9903. The FTIR results of cell openers and open cell rate of ORPUFs showed that O-500 has more effective cell opening capacity. In the ORPUF foaming formulation using O-500 as cell opener, silane coupling agent (KH-550) modified kaolin (organo-kaolin) was introduced into ORPUF with different weight loadings. The cellular morphology, apparent density, and compressive strength of the foams were tested in order to investigate the effects of organo-kaolin on the open cell rate and compressive property of the foams. The results showed that the open cell rate of ORPUFs slightly increased from 83.9% to 92.9% with the content of organo-kaolin. Meanwhile, compared to neat ORPUF, the compressive strength of foams increased by 72.8% when the content of introduced organo-kaolin was 4 parts per hundred of polyol by mass (php).

Surface Modification Methods to Improve UV Inkjet Printing Performance of Ceramic

2015 ◽  
Vol 731 ◽  
pp. 476-480
Author(s):  
Zheng Jian Zhang ◽  
Li Ying Yang ◽  
Shi Liang Zhu ◽  
Hai Ying Yang
Keyword(s):  
Inkjet Printing ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Raw Materials ◽  
Three Dimensional ◽  
Ceramic Materials ◽  
Print Quality ◽  
Printing Quality ◽  
Silane Coupling ◽  
The Impact

Using UV inkjet printing can achieve three-dimensional printing of ceramic materials, but there is low ink adhesion, easy to fall off and other issues, surface coated modification to high smoothness ceramic materials can solve the above problems [1]. In this study, the silane coupling agent, adhesive, resin and other raw materials prepared for transparent coating, which applied to the surface of the ceramics. The impact of process parameters and coating formulation on the UV print quality of the ceramic base was systematic analyzed, the result shows that the volume concentration of 10% KH550 silane coupling agent as primer, and using 20wt% 102 multipurpose plastic glue for surface coating, better ink adhesion and printing quality can be obtained.

scholarly journals Properties of Concrete Prepared with Silane Coupling Agent-Impregnated Coral Aggregate and Coral Concrete

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6454
Author(s):  
Jinming Liu ◽  
Boyu Ju ◽  
Qing Yin ◽  
Wei Xie ◽  
Haiying Xiao ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Water Absorption ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Sem Images ◽  
Microscopic Appearance ◽  
Coarse Aggregates ◽  
Cement Mortars ◽  
Silane Coupling ◽  
Before And After

Silane coupling agent (SCA), a kind of organic solvent, was introduced to improve the performance of coral coarse aggregates and enhance the interfacial adhesion between the inorganic coral aggregate and the cement paste of coral concrete. The crushing indicator and water absorption of the coral aggregates over various dipping times were measured, and the slump, interface microhardness, and compressive strength of coral concrete tested. The microscopic appearances of the coral concrete before and after modification were analyzed based on SEM images. The experimental results indicate that SCA can effectively reduce the crushing indicator and water absorption of coral coarse aggregates, and the modification performance becomes better over time. SCA facilitates the generation of chemical forces between the coral aggregates and cement mortars, improves adhesion between the aggregates and mortars, augments the microhardness of the interface, and increases the compressive strength. According to the microscopic appearance of the treated and untreated coral aggregate interfaces, the aggregates and the mortars are in closer combination after modification.

scholarly journals Preparation of nanosized NaA zeolite and its surface modification by KH-550

2018 ◽  
Vol 36 (4) ◽  
pp. 638-643 ◽  
Author(s):  
Jin Hou ◽  
Qiwang Jiang
Keyword(s):  
Surface Modification ◽  
Reaction Time ◽  
Reaction Temperature ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Ph Value ◽  
Raw Materials ◽  
Hydrolysis Time ◽  
Naa Zeolite ◽  
Silane Coupling

AbstractNanosized NaA zeolite was successfully synthesized by hydrothermal method using tetraethyl orthosilicate (TEOS) and aluminum isopropoxide (AIP) as the main raw materials. The surface modification of NaA zeolite was carried out by silane coupling agent 3-aminopropyltriethoxysilane (KH-550). The effects of silane coupling agent dosage, reaction temperature, reaction time, hydrolysis time and pH value on grafting rate of NaA zeolite were investigated in detail. The zeolites were characterized by XRD, SEM-EDS, FT-IR and TG-DTA. The results showed that the surface of NaA zeolite was modified successfully by KH-550. The optimal modification conditions obtained were as follows: the dosage of coupling agent in 95 % ethanol – 1.6 %, reaction temperature − 70 °C, reaction time – 2 h, hydrolysis time – 20 min, and pH value – 3.5. Under these conditions, the grafting rate of modified NaA zeolite was 3.95 %.

scholarly journals Preparation and Thermal Decomposition Kinetics of Novel Silane Coupling Agent with Mercapto Group

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Wu Xue-ying ◽  
Wang Ya-zhen ◽  
Di Yu-tao ◽  
Lan Tian-yu ◽  
Zu Li-wu
Keyword(s):  
Thermal Decomposition ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Raw Materials ◽  
Kinetic Equations ◽  
Product Yield ◽  
Terminal Group ◽  
Experimental Scheme ◽  
Water Solvent ◽  
Silane Coupling

Using carbon disulfide and 3-aminopropyltriethoxysilane as raw materials, a novel silane coupling agent with a terminal group was synthesized for the first time. The compound was synthesized in two steps in ethanol water solvent under the action of the catalyst triethylamine and a sulfhydryl-protecting agent. The product was characterized by FT-IR, 1H NMR, and mass spectra to determine and prove its structure. The best experimental scheme was explored by a single factor experiment: a thiol-protecting agent selected iodomethane, the total reaction time was 2 hours, the two-step reaction temperature was 15°C and 10°C, respectively, and  ncarbon disulfide: n3−aminopropyl three ethoxysilane=1.4:1. Under these conditions, the product yield was up to 74.28%. Secondly, using the nonisothermal decomposition method, the thermal stability and thermal decomposition enthalpy of a thiohydrazide-iminopropyltriethoxysilane coupling agent were measured by a differential scanning calorimeter (DSC). Thereby, the thermal decomposition kinetic parameters and kinetic equations of the thiohydrazide-iminopropyltriethoxysilane coupling agent were derived.

scholarly journals Improved Hydrophobicity of Macroalgae Biopolymer Film Incorporated with Kenaf Derived CNF Using Silane Coupling Agent

Molecules ◽  
2021 ◽  
Vol 26 (8) ◽  
pp. 2254
Author(s):  
Adeleke A. Oyekanmi ◽  
N. I. Saharudin ◽  
Che Mohamad Hazwan ◽  
Abdul Khalil H. P. S. ◽  
Niyi G. Olaiya ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Cellulose Nanofibrils ◽  
Hydroxyl Groups ◽  
Water Contact ◽  
Silane Coupling ◽  
Cnf Films ◽  
Kenaf Bast ◽  
Thermal Stability Of

Hydrophilic behaviour of carrageenan macroalgae biopolymer, due to hydroxyl groups, has limited its applications, especially for packaging. In this study, macroalgae were reinforced with cellulose nanofibrils (CNFs) isolated from kenaf bast fibres. The macroalgae CNF film was after that treated with silane for hydrophobicity enhancement. The wettability and functional properties of unmodified macroalgae CNF films were compared with silane-modified macroalgae CNF films. Characterisation of the unmodified and modified biopolymers films was investigated. The atomic force microscope (AFM), SEM morphology, tensile properties, water contact angle, and thermal behaviour of the biofilms showed that the incorporation of Kenaf bast CNF remarkably increased the strength, moisture resistance, and thermal stability of the macroalgae biopolymer films. Moreover, the films’ modification using a silane coupling agent further enhanced the strength and thermal stability of the films apart from improved water-resistance of the biopolymer films compared to unmodified films. The morphology and AFM showed good interfacial interaction of the components of the biopolymer films. The modified biopolymer films exhibited significantly improved hydrophobic properties compared to the unmodified films due to the enhanced dispersion resulting from the silane treatment. The improved biopolymer films can potentially be utilised as packaging materials.

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