https://iopscience.iop.org/article/10.1088/2053-1591/abcc2d/pdf

Preparation of aniline trimer modified graphene oxide new composite coating and study on anticorrosion performance

Preparation and electrochemical performance of activated carbon microspheres from recycled novolak phenol formaldehyde

In this experiment, terephthalyl alcohol was used as a modifier to modify phenol under both acidic and alkaline conditions to obtain modified phenols with different molecular structures. Subsequently, the modified phenols reacted with paraformaldehyde in an alkaline environment. After foaming and curing, a modified phenolic foam with high heat aging resistance was obtained. The molecular structure was characterized via Fourier transform infrared spectrometry (FT-IR) and nuclear magnetic resonance spectroscopy (13C NMR). The results showed that two different structures of phenolic resin can be successfully prepared under different conditions of acid and alkali. The modified phenolic foam was tested by thermogravimetric analysis. In addition, the modified phenolic foam was tested for mass change rate, dimensional change rate, powdering rate, water absorption rate, and compressive strength before and after aging. The results show that the modified phenolic foam has excellent performance. After heat aging for 24 h, the mass loss rate of the modified phenolic foam obtained by acid catalysis was as low as 4.5%, the pulverization rate was only increased by 3.2%, and the water absorption of the modified phenolic foam increased by 0.77%, which is one-third that of the phenolic foam. Compared with the phenolic foam, the modified phenolic foam shows good heat aging resistance.

https://www.mdpi.com/2073-4360/11/8/1267/pdf

The Preparation and Properties of Terephthalyl-Alcohol-Modified Phenolic Foam with High Heat Aging Resistance

The invention belongs to the technical field of preparation of silicon steel insulating coatings and particularly relates to preparation and application of an environment-friendly insulating coating solution for oriented silicon steel. Based on the total mass, the coating solution comprises the following components by mass percent: 23-26% of an aluminium dihydrogen phosphate solution, 13-17% of zinc dihydrogen phosphate, 5-6% of boric acid, 20-25% of silica sol, 3.5-4.5% of fumed silica and the balance of water. The oriented silicon steel is coated with the environment-friendly insulating coating solution and then subjected to baking and high-temperature sintering, so that a coating is formed, and the formed coating has high interlayer resistance, meets the demand on insulation performance, and has favorable adhesiveness, surface mechanical property and processability.

Preparation and application of environment-friendly insulating coating solution for oriented silicon steel

The invention provides a non-toxic and environmental-protection oriented electrical steel insulating coating layer; the coating layer is prepared from the following components by the mass percentage: 15-40% of metal magnesium dihydrogen phosphate; 25-45% of zinc phosphate; 0.1-1% of sodium tetraborate; 3-10% of colloidal silica; 5-12% of nano TiO2; 15-35% of organic resin; 0.2-3% of a nonionic surfactant; the balance deionized water. The insulating coating layer provided by the invention has bright and dense surface, does not contain harmful chromium elements, also has good insulating property, adhesion power, punching property and weldability, ensures uniform coating layer and good corrosion resistance and oxidation resistance, and has the lamination factor greater than 98.6%.

Non-toxic and environmental-protection oriented electrical steel insulating coating layer

The invention relates to a chromium-free insulating paint for oriented silicon steel and a preparation method thereof. The technical scheme is as follows: the chromium-free insulating paint for oriented silicon steel is composed of 15-35 wt% of organic mixed resin, 10-30 wt% of silica sol, 0.2-2.5 wt% of aluminum dihydrogen phosphate, 0.1-4.0 wt% of inorganic buffering agent, 0.5-7.0 wt% of silane coupling agent, 0.1-1.0 wt% of assistant, 0.1-0.5 wt% of alkylphenol polyoxyethylene and the balance of water. The preparation method comprises the following steps: sequentially adding the silane coupling agent and assistant into the organic mixed resin under stirring conditions to obtain an organic emulsion; sequentially adding the aluminum dihydrogen phosphate, silica sol and alkylphenol polyoxyethylene into water, and stirring until the aluminum dihydrogen phosphate is completely dissolved, thereby obtaining an inorganic emulsion; and mixing the organic emulsion and inorganic emulsion, and stirring to obtain the chromium-free insulating paint for oriented silicon steel. The chromium-free insulating paint for oriented silicon steel has the characteristics of high stability, excellent adhesiveness, excellent corrosion resistance and excellent insulativity.

Chromium-free insulating paint for oriented silicon steel and preparation method thereof

Study on the preparation of carbon nanotubes by iron modified phenolic resin pyrolysis

Belonging to the field of phenolic resin technplogy, the invention discloses modified phenolic resin capable of producing in-situ graphene and a preparing method thereof. This preparing method produces phenolic resin intermediate by mixing phenolic compounds, aldehyde compounds and acidic catalysts, and then adjusts PH between 6. 0-8. 0 to get modified water-holding phenolic resin by adding glycine or aminopolycanboxylic acid plus transition metal ions; after vacuum heating, adding ethanol or ethylene glycol to adjust viscosity, and then finally to obtain the modified phenolic resin which can produce in-situ graphene. This preparing method is easy and with mild operation condition allowing transition metal ions to be modified onto resins without the introduction of impurities, on the promise of a high generation rate which can be 0.1wt%-10wt% of in-situ graphene produced by the modified phenolic resin in low temperature.

Modified phenolic resin capable of producing in-situ graphene and preparing method thereof

The use of formaldehyde and phenol as raw materials, under the acidic catalyst, the high temperature polymerization produces a thermoplastic phenolic resin. At low temperatures, modified nickel sulfate is added to synthesize Ni-modified thermoplastic phenolic resin, and carbonization is carried out at high temperature. The effects of carbonization temperature, carbonization heating rate and nickel doping amount on the carbonization product are investigated. Experiments have shown that the optimal conditions for the Ni-modified thermoplastic phenolic resin. The molar ratio of formaldehyde to phenol is 0.85, oxalic acid accounts for 2% of the mass of phenol. The reaction temperature is 100° C. The reaction time is 2 h. The molar ratio of iminodiacetic acid to phenol is 0.03, and the molar ratio of nickel sulfate to phenol is 0.04. The combined temperature is 60°C and the chelating time is 40 minutes. The pyrolytic carbon of the nickel modified phenolic resin is characterized by field emission electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results show that the best carbonization temperature is 10 °C/min at 1100°C for 3 h, and a large number of carbon nanotubes are formed in the pyrolytic carbon.

https://iopscience.iop.org/article/10.1088/1757-899X/423/1/012080/pdf

Synthesis and carbonization of nickel-modified thermoplastic phenolic resin

Study on preparation and corrosion resistance of graphene oxide modified polyurethane resin

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