531-18-0Relevant articles and documents
High surface area metal salt templated carbon aerogels via a simple subcritical drying route: Preparation and CO2 uptake properties
Masika, Eric,Mokaya, Robert
, p. 17677 - 17681 (2013)
We describe a very simple method for the formation of high surface area carbon aerogels from melamine-formaldehyde resins, via metal salt (CaCl 2) templating, wherein subcritical drying is used and no activation is required. The metal salt acts as a porogen to generate carbon aerogels with surface area of up to 1100 m2 g-1, which exhibit significant CO2 uptake of up to 2.2 mmol g-1 at 298 K and 1 bar. The Royal Society of Chemistry.
Method for improving acyl methyl melamine methylol content method
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Paragraph 0021-0044, (2017/08/08)
The invention relates to a method of increasing the hydroxymethyl content of hexahydroxymethyl melamine. The method concretely comprises the following steps: (1) according to the molar ratio of melamine, formaldehyde and water to be 1 to (6-7) to (30-35), adding the amount of the water into a reaction kettle, regulating the rotary speed of a stirrer of the reaction kettle to be 80-120rpm, adding the amount of the formaldehyde, raising the temperature, regulating the temperature to be 45-50 DEG C, adding the amount of the melamine, stirring for 10-30 minutes, keeping the temperature to be 55-60 DEG C, wherein in the whole process, a pH value of a reaction system to be 8.3-8.4 is kept by using a buffer liquid, and the buffer liquid is a sodium carbonate-sodium bicarbonate buffer liquid; (2) after the melamine in the reaction system is completely dissolved, lowering the stirring speed of the reaction kettle to 50-70rpm, and keeping reaction for 2-3h; and (3) stopping stirring, standing for crystallization for 1-1.5h, carrying out air pump filtration separation, removing a waste liquid, and drying to obtain the finished hexahydroxymethyl melamine. According to the method disclosed by the invention, the hydroxymethyl content of the hexahydroxymethyl melamine achieves 59-61 percent.
LIQUID CRYSTAL ALIGNING AGENT, LIQUID CRYSTAL ALIGNMENT FILM AND LIQUID CRYSTAL DISPLAY DEVICE
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Paragraph 0207-0208, (2021/01/07)
The invention provides a liquid crystal aligning agent, a liquid crystal aligning film, a liquid crystal display element, a compound and a manufacture method of the compound. The liquid crystal aligning agent can be used as the forming material of the liquid crystal aligning film and has excellent performance suitable for printing; completely satisfy the properties as the liquid crystal display element required by the practicality aspect such as: vertical aligning property, voltage keeping rate and weathering resistance and also easily peel off when the product has defect. The liquid crystal aligning agent contains (A) at least one polymer selected from a group consisting of a polyamic acid and a polymide and (B) a compound represented by the formula (1).
