Study on Preparation of Novel Dicyclopentadiene Phenol Epoxy Resin Materials Based on Different Degrees of Polymerization

2021 ◽  
Vol 871 ◽  
pp. 222-227
Author(s):  
Shao Bo Ma ◽  
Zhao Xi ◽  
Gang Wang ◽  
Li Cheng ◽  
Wei Zhang
Keyword(s):  
Epoxy Resin ◽  
Curing Temperature ◽  
Process Conditions ◽  
Paper Briefly ◽  
Gel Time ◽  
Reaction Heat ◽  
Effects Of Temperature ◽  
Agent Structure ◽  
Temperature Time ◽  
Phenolic Epoxy Resin

This paper briefly describes the relevant properties of epoxy resin materials, and introduces the domestic and international progress of dicyclopentadiene (DCPD) phenolic epoxy resin. The process conditions of dicyclopentadiene phenol resin and epoxy resin were studied. Dicyclopentadiene phenol epoxy resin with different degrees of polymerization was prepared. The reaction heat was measured and the curing temperature, time and curing were analysed. The influence of factors such as the agent structure on the gel time and curing degree of DCPD phenol epoxy resin; the effects of temperature and time on the curing reaction of DCPD phenol epoxy resin were discussed.

Study on the Phenolic - Epoxy Resin System

2015 ◽  
Vol 1088 ◽  
pp. 439-443
Author(s):  
Yong Li Peng ◽  
Li Zeng
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Phenolic Resin ◽  
Oxygen Index ◽  
Gel Time ◽  
Service Characteristics ◽  
Low Viscosity ◽  
Epoxy Resin System ◽  
Ft Ir ◽  
Phenolic Epoxy Resin

By blending the different ratio of the low viscosity of bisphenol A type epoxy resin with low viscosity ammonia catalytic phenolic resin, the performance of the resin systems were investigated by the gel time, viscosity, mechanical properties, heat resistance, flame retardance. In addition, DSC was used to detect the thermal property, and FT-IR monitored the reactive process of phenolic-epoxy resin. When the phenolic resin was mixed with 5% epoxy resin, the results were as follow: the gel time of 121 s at 150°C, viscosity of 7760 mPa·s at 30°C, flexural strength of 83.3 MPa, impact strength of 6.9 kJ/m2, tensile strength of 20 MPa, heat deflection temperature of 148.5°C, oxygen index of 34.5% and the apparent cure activation energy of 94.2kJ/mol. The resin systems had higher service temperature, low viscosity, excellent mechanical properties and service characteristics, and it could meet the requirements of fast pultrusion process.

Preparation of Waterborne Epoxy Resin Emulsion

2013 ◽  
Vol 364 ◽  
pp. 627-630
Author(s):  
Ran Zhou Hao ◽  
Fei Yang Yun ◽  
Jiao Liu Xiao
Keyword(s):  
Bisphenol A ◽  
Epoxy Resin ◽  
Orthogonal Experiment ◽  
Hydroxyl Group ◽  
Waterborne Epoxy ◽  
Optimum Reaction ◽  
Ft Ir ◽  
Effects Of Temperature ◽  
Waterborne Epoxy Resin ◽  
Temperature Time

The hydrophilic carboxylic group was induced into the main chain of the bisphenol-A-type epoxy resin via alcoholysis reaction between the maleic anhydride and he secondary hydroxyl group of the bisphenol-A-type epoxy resin. Then a self-emulsifying type aqueous epoxy resin was developed. The chemical structure of the resultant was analyzed by FT-IR. The effects of temperature, time, ratio of reactants and neutralization temperature on the reaction were discussed. Then the optimum reaction condition was determined through orthogonal experiment design. The synthesized waterborne epoxy resin has favorable stability and water-dispersion.

Study on Processing Properties of Epoxy Resin System in VARI

2012 ◽  
Vol 463-464 ◽  
pp. 704-707
Author(s):  
Chen Hui Zhao ◽  
Guang Cheng Zhang ◽  
Wei Min Sun ◽  
Ai Hua Shi
Keyword(s):  
Epoxy Resin ◽  
Low Cost ◽  
Curing Temperature ◽  
Resin System ◽  
Gel Time ◽  
Advanced Composite ◽  
Advanced Composite Materials ◽  
Epoxy Resin System ◽  
Processing Properties ◽  
Cast Plate

As a low cost moulding technology, VARI is widely used to produce advanced composite materials. At the same time, the particularity of VARI process make it have particular requirements on resin system. Epoxy resin system attracts extensive attention because of its good process performance. Curing reaction and rheological behavior of epoxy resin system were studied by DSC and viscosity experiments. The results showed that resin viscosity decreased from 2600 mPa•S at 15°C to 600mPa•S at 40°C . Viscosity of resin system rose about 0.5Pa•s within the first 2h. Gel time shortened dramatically when the temperature exceed 60°C. the curing temperature is 60°C be based on DSC curve and gel time-temperature curve. Resin cast plate of epoxy resin system has good mechanical properties of compression strength.

scholarly journals Rheological Behavior of Isothermal Cured Epoxy/1,4-Diaminobenzene Systems

2018 ◽  
Vol 11 (1) ◽  
Author(s):  
Salah N. Farhan ◽  
Muataz H. Ismael ◽  
Ayad Dari Jaafar
Keyword(s):  
Epoxy Resin ◽  
Rheological Behavior ◽  
Reaction Rates ◽  
Curing Temperature ◽  
Curing Agent ◽  
Resin System ◽  
Gel Time ◽  
Epoxy Resin System

A novel curing agent (1,4-diaminobenzene) was used to enhance behavior of the epoxy resin system. The effect of the curing agent content (12 to 21 wt%) subjected to the isothermal curing temperatures at 80 °C to 110 °C were performed. Results indicate that the gel time was effected slightly on the viscosity when the curing temperature was higher than 90 °C and curing material consist over from 18wt %. These results explain that reaction rates caused by higher curing temperature.

EFFECTS OF TEMPERATURE-TIME COMBINATIONS ON DONENESS AND YIELDS OF WATER-COOKED BROILER THIGHS

1975 ◽  
Vol 40 (1) ◽  
pp. 129-132 ◽  
Author(s):  
C. E. LYON ◽  
B. G. LYON ◽  
A. A. KLOSE ◽  
J. P. HUDSPETH
Keyword(s):  
Effects Of Temperature ◽  
Temperature Time

Study on Extracting Potassium from Potassium Feldspar with Molten Salt Leaching Method

2012 ◽  
Vol 524-527 ◽  
pp. 1078-1081
Author(s):  
Jian Guo Song ◽  
Xin Zhi Wang ◽  
Shao Dan Xiao ◽  
Wei Liu
Keyword(s):  
Reaction Time ◽  
Molten Salt ◽  
Potassium Feldspar ◽  
Process Conditions ◽  
Temperature Reaction ◽  
Optimal Process ◽  
Potash Feldspar ◽  
Salt Leaching ◽  
Effects Of Temperature

This article aims to study the technology of extracting potassium from potassium feldspar with molten salt leaching method and to analyze the effects of temperature, reaction time and other factors on extracting potassium, concluding the optimal process conditions of extracting potassium with molten leaching method from potash feldspar.

Preparation and properties of novel sulfonic graphene oxide–epoxy resin nanocomposites by resin transfer molding process

2016 ◽  
Vol 51 (9) ◽  
pp. 1197-1208 ◽  
Author(s):  
Wei Li ◽  
Hongyu Li ◽  
Xinguo Yang ◽  
Wei Feng ◽  
Hongyun Huang
Keyword(s):  
Graphene Oxide ◽  
Impact Strength ◽  
Epoxy Resin ◽  
Curing Temperature ◽  
Flexural Property ◽  
Oxide Content ◽  
Molding Process ◽  
One Pot ◽  
Epoxy Resin Nanocomposites ◽  
The Impact

This paper reported a facile one-pot strategy for fabrication of sulfonic graphene oxide–epoxy resin nanocomposites. The rheological and thermal properties were employed to characterize the viscosity and the curing temperature of epoxy resin. Fourier transform infrared spectra for sulfonic graphene oxide and nanocomposites indicated that the sulfonic graphene oxide contains chemical cross-linking responsible for better interactions with the epoxy resin. The state of dispersion was evaluated at different scales by still picture camera and scanning electron microscopy (SEM). Tensile property tests indicated that the tensile strength and elasticity modulus of sulfonic graphene oxide–epoxy resin nanocomposites decreased slowly with increasing of sulfonic graphene oxide content. The critical flexural property and impact strength of epoxy resin filled with sulfonic graphene oxide nanocomposites were measured. The content, size, and dispersion state of sulfonic graphene oxide were examined. It was found that the content of sulfonic graphene oxide has greater impact on both flexural property and impact strength of nanocomposites compared with other conditions. For instance, the impact strength increased by 113.0% and the flexural strength and modulus increased by 39.3% and 55.7% using 1 wt.% sulfonic graphene oxide as compared to neat epoxy resin.

The Effect of PMMA Thickness on Thermal Bone Necrosis around Acetabular Sockets

1994 ◽  
Vol 208 (1) ◽  
pp. 45-51 ◽  
Author(s):  
I C Revie ◽  
M E Wallace ◽  
J F Orr
Keyword(s):  
Layer Thickness ◽  
Hip Replacement ◽  
Curing Temperature ◽  
In Vitro Experiments ◽  
Bone Necrosis ◽  
Maximum Thickness ◽  
Cement Layer ◽  
Temperature Time

One aim of custom acetabular hip replacement sockets is to achieve fixation through a uniform cement layer of selected thickness. In vitro experiments demonstrate that curing temperatures are determined by cement thickness and position relative to the socket rim. A maximum thickness of 7 mm is indicated by interpretation of curing temperature-time relationships in terms of predicted bone necrosis. It is concluded that the results contribute to the establishment of an optimum cement layer thickness, but other factors require investigation to complement this work to gain further understanding of the problem.

scholarly journals THE INFLUENCE OF PROCESS CONDITIONS ON GROUND COAL SLAG AND BLAST FURNACE SLAG BASED GEOPOLYMER PROPERTIES

2020 ◽  
Vol 35 (4) ◽  
pp. 15-20
Author(s):  
Quyen V. Trinh ◽  
Gábor Mucsi ◽  
Thai V. Dang ◽  
Ly P. Le ◽  
Van H. Bui ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Particle Density ◽  
Curing Temperature ◽  
Process Conditions ◽  
Ph Values ◽  
Specimen Density ◽  
Coal Slag ◽  
Furnace Slag

In this study, the material characterization of Vietnamese ground coal slag and ground granulated blast furnace slag (GGBFS), such as particle size distribution, chemical composition, bulk density and particle density are shown. The geopolymer specimens were prepared by mixing an 80 m/m% mass of solid materials (ground coal slag and GGBFS in a different ratio) with 20 m/m % of a 10M NaOH alkaline activator. A systematic experimental series was carried out in order to optimize the preparation process. In that series, the heat curing temperature was 60°C for 6 hours, and then selected specimens were heat treated at a high temperature (1000 °C) for 1 hour. After 7 days of ageing, the physical properties of the geopolymer (compressive strength, specimen density) were measured. Also, after 180 days of ageing, the pH values of water in the geopolymer leaching preparation were determined. The results show that the geopolymer can be used for refractory applications due to its good heat resistance properties. However, geopolymers that were heated at 1000 °C had lower compressive strength, specimen density and pH values of water containing the geopolymer than those that were cured at 60 °C.

scholarly journals Precipitation of Germanium from Sulphate Solutions Containing Tin and Indium Using Tannic Acid

2019 ◽  
Vol 9 (5) ◽  
pp. 966 ◽  
Author(s):  
Michał Drzazga ◽  
Andrzej Chmielarz ◽  
Grzegorz Benke ◽  
Katarzyna Leszczyńska-Sejda ◽  
Magdalena Knapik ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Tannic Acid ◽  
Process Conditions ◽  
Influence Of Temperature ◽  
Temperature Time

The precipitation of tannin complex of germanium from sulfuric solutions obtained after dross leaching was investigated. The tested solutions contained mainly zinc, germanium, indium, and tin. The influence of temperature, time, amount of added tannic acid and its purity was determined. The application of pure tannic acid allowed the precipitation of >99% of germanium and decreased its concentration in a solution <0.015 g/dm3. It required ca. 11–13 g of pure tannic acid per each 1 g of dissolved germanium. The preferred process conditions for Ge precipitation using powder tannic acid were 90 °C, 90 min, whereas for 20% aq. solution—5 min. It was found that 40% to 50% of tin coprecipitated at these conditions. Therefore, a detinning operation using hydrogen peroxide was proposed. It allowed the removal of >99% Sn and reduced its concentration in the solution below 0.025 g/dm3.

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