- High surface area metal salt templated carbon aerogels via a simple subcritical drying route: Preparation and CO2 uptake properties
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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.
- Masika, Eric,Mokaya, Robert
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Read Online
- Plasticization and thermal behavior of hydroxyl and nitrogen rich group-containing tung-oil-based ester plasticizers for PVC
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Hydroxyl and nitrogen rich group-containing tung-oil-based ester (GEHTMA-1, GEHTMA-2, GEHTMA-3 and GEHTMA-4) plasticizers were successfully synthesized from tung-maleic anhydride and utilized to plasticize poly(vinyl chloride) (PVC). In comparison to petroleum-based plasticizers (e.g. DOTP), the mechanical test shows that bio-based GEHTMA-3 displays better mechanical properties, which means that GEHTMA-3 could endow PVC resins with well-balanced properties of flexibility and strength. With the addition of GEHTMA-3 into DOTP, PVC/DOTP/GEHTMA-3 exhibits better mechanical properties, plasticization performance, migration resistance and thermal stability compared with the PVC/DOTP system. Above all, PVC/28DOTP/12GEHTMA-3 shows the highest tensile strength and elongation of 32.19 MPa and 345.20%, respectively. PVC/32DOTP/8GEHTMA-3 displays the best thermal stability. The superior performance is attributed to the molecular interaction of GEHTMA-3 and DOTP with PVC. The interaction originates from the simultaneous introduction of hydroxyl, epoxy, benzene ring, ester and nitrogen rich groups into GEHTMA-3 structures. Besides, GEHTMA-3 presented good miscibility with PVC resins, particularly when a mixture of DOTP and GEHTMA-3 was used. In addition, possible plasticization of the PVC/DOTP/GEHTMA-3 system was presented.
- Wang, Mei,Song, Xianghai,Jiang, Jianchun,Xia, Jianling,Ding, Haiyang,Li, Mei
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p. 2422 - 2431
(2018/02/19)
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- Method for improving acyl methyl melamine methylol content method
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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.
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Paragraph 0021-0044
(2017/08/08)
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- LIQUID CRYSTAL ALIGNING AGENT, LIQUID CRYSTAL ALIGNMENT FILM, LIQUID CRYSTAL DISPLAY, COMPOUND, AND PROCESS FOR PRODUCING THE COMPOUND
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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 form the liquid crystal aligning film capable of keeping good liquid crystal aligning performance and electric character and good weathering resistance even though after long time continuous driving and also preventing the residual DC voltage from increasing. 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).
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Paragraph 0211-0212
(2020/11/25)
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- LIQUID CRYSTAL ALIGNING AGENT, LIQUID CRYSTAL ALIGNMENT FILM AND LIQUID CRYSTAL DISPLAY DEVICE
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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).
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Paragraph 0207-0208
(2021/01/07)
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- NOVEL GEMINI SURFACTANTS AND THEIR USE
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Disclosed herein are gemini surfactants, and methods for making and using these gemini surfactants. These gemini surfactants may be incorporated in paints and coatings to provide hydrophilic and/or self-cleaning properties. Surfactants are compounds composed of both hydrophilic and hydrophobic or lipophilic groups. In view of their dual hydrophilic and hydrophobic nature, surfactants tend to concentrate at the interfaces of aqueous mixtures; the hydrophilic part of the surfactant orients itself towards the aqueous phase and the hydrophobic part orients itself away from the aqueous phase.
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Paragraph 0116-0118
(2015/06/18)
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- MULTI-FUNCTIONAL ACRYLATES
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Disclosed herein are derivatives of phenolic and melamine compounds, methods of making these derivatives, and methods of using them. The compounds include phenolic and melamine compounds with multi-functional acrylate groups, polyethylene glycol and amino groups. The compounds may be cured to form resins that may be used in a variety of applications, such as paints, hydrogels, polyacrylate super absorbent polymers (SAPs), adhesives, composites, sealants, fillers, fire retardants, crosslinking agents, and the like.
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Paragraph 0048
(2014/09/03)
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- Green regioselective azidolysis of epoxides catalyzed by multi-site phase-transfer catalyst
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A facile synthesis of 1,2-azidoalcohols from their epoxides using α,α',α''-N-hexakis(triethylammoniummethylene chloride)-melamine as amulti-site phase-transfer catalyst in water was developed. By this eco-friendly and highly atom-economic method, a variety of 1,2-azidoalcohols was obtained in high yields with excellent regioselectivity and in short reaction times. Application of this six-site PTC in the ring opening of epoxides by cyanide, acetate and chloride anions was also studied. The catalyst can be recovered after completion of the reaction and can be recycled without affecting the catalytic property.
- Kiasat, Ali Reza,Mirzajani, Roya,Shalbaf, Haji,Tabatabaei, Tahereh,Fallah-Mehrjardi, Mehdi
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scheme or table
p. 594 - 599
(2010/07/02)
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- Continuous process for production of methylol melamines and use thereof for production of highly etherified melamine resins
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The object of the present invention is a novel continuous process for the production of methylol melamines, especially of hexamethylol melamine and of a mixture of higher methylol melamines, wherein a continuous synthesis from a formaldehyde solution and melamine is combined with a continuous drying of the resulting product mixture, whereby a product in the form of a powdery material with a low content of free formaldehyde and water is obtained. Simultaneously, the invention also relates to a process for the production of highly etherified melamine resins based on hexamethylol melamine produced by a process according to the present invention and to the use of hexamethylol melamine produced by a process according to the present invention in a process of the production of highly etherified melamine resins. Particularly, the invention relates to a process of the production of hexamethoxymethylol melamine (HMMM), hexabutoxymethylol melamine (HBMM) and mixed ethers of C1-C5 alkohols on the basis of hexamethylol melamine produced by a process according to the invention.
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Page/Page column 6-7
(2008/06/13)
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- Reaction products of melamine and derivatives thereof
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Reaction products of the reactants comprising a) an intermediate reaction product of melamine and formaldehyde; and b) at least one compound of formula I RX(EO)n(PO)m(BO)pH??(I) wherein R is a substituted or unsubstituted, saturated or unsaturated, organic group having from 4 to 36 carbon atoms; X is —O—, —S—, or —NR1— where R1 is hydrogen or a C1-C8 alkyl group; n is a number of from 0 to 100; m is a number of from 0 to 50; and p is a number of from 0 to 50; provided that the sum of n, m, and p is at least 1; wherein the EO represents the residue of ethylene oxide, PO represents the residue of propylene oxide, and BO represents the residue of butylene oxide; and wherein the EO, PO, and BO groups when present can be in random and/or block distribution and can be in any order with respect to the X group; wherein the above reaction products are useful as low foaming surfactants and/or as defoaming agents.
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