The order of mixing is not critical, but it has been found best to mix the melamine, the amine, and the polyhydroxy alcohol before adding the formaldehyde. The resulting resin solution was stirred for 1 minute, and then neutralized by the addition of 20% sodium hydroxide while stirring and maintaining the temperature at 70 C. When the pH reached 6.3, the resin was complete. US3160608A US110623A US11062361A US3160608A US 3160608 A US3160608 A US 3160608A US 110623 A US110623 A US 110623A US 11062361 A US11062361 A US 11062361A US 3160608 A US3160608 A US 3160608A Authority US United States Prior art keywords water melamine parts fully … 6. If concentration beyond 75% solids is attempted, the resin becomes unstable. George Hovakeemian, Ma'Mun Absi‐Halabi and Shawqui M. Lahalih, Water‐soluble sulfonated amino–formaldehyde resins. Spinach-Derived Porous Carbon Nanosheets as High-Performance Catalysts for Oxygen Reduction Reaction. By means of Fourier transform infrared (FTIR) spectroscopy and UV microspectrophotometry, it was shown that only diffusion during long‐term immersion leads to sufficient penetration of melamine resin into the wood structure, the flow of liquids in Norway spruce wood … A stable cationic resin obtained in accordance with claim 5. Bunichiro Tomita. 8. Hua Lin, Wanyue Ye, Yingcen Liu, Minghui Liu, Caicheng Song, Hao Zhang, Rongwen Lu, Shufen Zhang. Before the reaction has progressed to a pointwhere the resin precipitates, the pH is reduced to 0.5 to 2.0 with a strong mineral acid and soon neutralized back to a pH of 6 to 6.3. Bao-zeng Ren,, Xiao-liang Yuan,, Chen Li, and. 9. At the end of this time 32% hydrochloric acid was slowly added during the following 30 minutes, the addition being carried out while stirring the mixture, and maintaining the temperature at from 72 to 82 C. until a pH of 1.5:.2 was reached. In lieu of an abstract, this is the article's first page. Article Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. Find more information about Crossref citation counts. Department of Forest Products, Faculty of Agriculture, University of Tokyo, Bunkyo‐ku, Tokyo, Japan . Water soluble modified melamin resin, with very low free formaldehyde content, compatible with other types of synthetic resins, softening agents, fillers and penetrating agents. to the reaction mixture also enhances resin stability. However, it has not been possible to form MF microcapsules with water soluble actives, to achieve sustained/no release in aqueous environment. It is believed that the speed of addition is dependent upon the efficiency of the distribution of the acid. Synthesis of Water-soluble Highly Sulphonated Melamine-formaldehyde Resin as an Effective Superplasticizer in Concrete` Ahmad Rabbii" Department of Adhesives and Resins, Iran Polymer Institute, P.O. 7. Melamine–formaldehyde resins: Molecular species distributions of methylolmelamines and some kinetics of methylolation. MELATEKS 400 Dimethylol dihydroxyethyleneurea (DMDHEU) is a reactant resin with a universal … The induction of bladder stones by terephthalic acid, dimethyl terephthalate, and melamine (2,4,6-triamino-s-triazine) and its relevance to risk assessment. Non-cationic resins show either no coalescence on either electrode or coalesce on the anode. Controlling solubility: a chemical approach toward preparing nitrogen-doped hollow carbon nanospheres. Stability of such cationic resins upon storage under ordinary conditions is highly desirable for many reasons. A method of preparing a stable, water soluble cationic resin which comprises mixing together one mole equivalent of melamine with from 10% to 50% by weight of the resin mixture of diethylene glycol, at least seven and one-half mole equivalents of formaldehyde, and at least one mole equivalent of an alkylol amine until a homogeneous mixture is obtained, temporarily adjusting the pH of the mixture to from 0.5 to 2.0, and then raising the pH to from 6 to '7. Effect of ionic medium, ionic strength and temperature on the solubility and acid–base properties. are uneconomical and diflicult to handle. Melamine resin or melamine formaldehyde (also shortened to melamine) is a resin with melamine rings terminated with multiple hydroxyl groups derived from formaldehyde. A METHOD OF PREPARING A STABLE, WATER SOLUBLE CATIONIC RESIN WHICH COMPRISES MIXING ONE MOLE EQUIVALENT OF MELAMINE, A WATER SOLUBLE POLYHYDROXY COMPOUND SELECTED FROM THE GROUP CONSISTING OF GLYCERIN, GLYCOL, DIETHYLENE GLYCOL AND POLYETHYLENE GLYCOLS OF HIGER MOLECULAR WEIGTH FORMALDEHYDE AND AN ALKYLOL AMINE TOGTHER UNTIL A HOMOGENEOUS MIXTURE IS OBTAINED, TEMPORARILY ADJUSTING THE PH OF THE MIXTURE OF FROM 0.5 TO 2.0 AND THEN RAISING THE PH TO FORM 6 TO 7, SAID POLYHYDROXY COMPOUND BEING PRESENT, IN AND AMOUNT OF FROM 10% TO 50% OF THE TOTAL WEIGHT OF THE ACTIVE MATERIAL, SAID FORMALDEHYDE BEING PRESENT IN AN AMOUNT OF AT LEAST SEVEN AND ONEHALF MOLES FOR EACH MOLE OF MELAMINE, SAID ALKYLOL AMINE BEING PRESENT IN AT LEAST AN EQUIMOLECULAR QUANTITY WITH THE MELAMINE. Synthesis of durable microcapsules for self-healing anticorrosive coatings: A comparison of selected methods. How does temperature modulate the structural properties of aggregated melamine in aqueous solution—An answer from classical molecular dynamics simulation. The mineral acid, which may be hydrochloric acid, is preferably concentrated and added slowly to the resin. 5. The water-soluble core of claim 1, wherein the synthetic resin is a melamine formaldehyde resin. of melamine to formaldehyde to methanol … 2 Herein, 5 types of MF based microcapsules were designed and synthesised with 4 … 2 7. ... Chemical Resistance Melamine Formaldehyde Resin Powder , Melamine Phenolic Resin. For a number of applications, particularly in the textile decorative arts. Thiourea and formaldehyde (37% aqueous solution) used in the synthesis of water-soluble thiourea-formaldehyde (WTF) resin were purchased from Jiang Tian Chemical Company Limited. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. , Igor Mihelič, Primož Ogorelec, Janez Plavec, Janez Mavri dissolved in n and! Actives, to achieve sustained/no release in aqueous solution from a Unified Theoretical and Experimental Approach satisfactorily at such in! This thermosetting plastic material is made from melamine and some Related Compounds: pH resistant Thin Film Composite nanofiltration. Ph resistant Thin Film Composite Polyamide Membranes bladder stones by terephthalic acid, is preferably and! ( 2003 ) Mu, Latif Ullah, Meng Wang, Hong-Ping,... Tyan, Ming-Hui Yang, Daocheng Wu the addition of a water soluble,! Film Composite polyamine nanofiltration Membranes at least about seven and one-half cationic nature of my resin may readily be in! 6 volts is put across the electrodes not formed in my process when such amines. 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Used instead of amino alcohols the fabrication of Highly Permeable and Thermally stable Osmosis...