If the resin is cationic it will flocculate or precipitate as curds. Processes of preparing water-soluble melamine-formaldehyde resins and products thereof Download PDF Info Publication number US2529856A. ... Chemical Resistance Melamine Formaldehyde Resin Powder , Melamine Phenolic Resin. 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 higher molecular weight, formaldehyde, and analkylol amine together and heating the mixture 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 '1, said polyhydroxy compound being present in an amount of from 10% to 50% of the total weight of the active materials, said formaldehyde being present in an amount of at least ten moles for each mole of melamine, said alkylol amine being present in at least an equimolecular quantity as the melamine. but as stated above, the presence of glycerine is required for maximum stability. 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. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) 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. Clemente Bretti, Concetta De Stefano, Gabriele Lando, Silvio Sammartano. 6. of melamine to formaldehyde to methanol … This article is cited by
A stable cationic resin obtained in accordance with claim 5. The methylol groups in the resins undergo esterification with alcohols, primarily n -butanol and methanol, to impart to them hydrophobic properties, solubility in organic solvents (during the preparation of varnishes), and the ability to combine with plasticizers. Herein, 5 types of MF based microcapsules were designed and synthesised with 4 … This latter cloudiness is due to the fact that polymerization has proceeded beyond the stage of water dispersibility and is to be avoided in the present process. Guo-Ying Zhao, Ling-Ling Mu, Latif Ullah, Meng Wang, Hong-Ping Li, Xin-Xin Guan. A second test which may be readily applied consists of adding bentonite to a solution of the resin. formaldehyde, polyhydroxy alcohol, and alkylol amine mixture first appears cloudy; as the reaction proceeds the mixture becomes clear and upon continued reaction it again becomes cloudy. The cationic nature of my resin may readily be demonstrated in either of two ways: By one method an 800 cc. In order to understand my invention more fully. The induction of bladder stones by terephthalic acid, dimethyl terephthalate, and melamine (2,4,6-triamino-s-triazine) and its relevance to risk assessment. Interfacial polymerization of cyanuric chloride and monomeric amines: pH resistant thin film composite polyamine nanofiltration membranes. of aqueous 5% resin solution are placed in the beaker. Quantities in excess of a ratio of twelve moles of formaldehyde per mole of melamine, while not deleterious to the product. Please reconnect, Authors & I do not know precisely how glycerine or other polyhydro'xy compound imparts stability to the resin. Synthesis of durable microcapsules for self-healing anticorrosive coatings: A comparison of selected methods. 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. A stable cationic resin obtained in accordance with claim 6. (Cl. It is believed that the speed of addition is dependent upon the efficiency of the distribution of the acid. Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Melamine-formaldehyde resins are amorphous white products that are readily soluble in water but insoluble in organic solvents. Despite the fact that the two main components of UF-resins are urea and formaldehyde, a broad variety of possible reactions and structures in the resins can be obtained. Commercially acceptable stability cannot be secured unless a ratio of at least about seven and one-half. The resin coalesces on the cathode quite readily. Get article recommendations from ACS based on references in your Mendeley library. The cathode is a rectangular piece of 40 mesh steel screen having the same dimensions as the anode. melamine formaldehyde resin water soluble from 106 Products. Understanding of Structure and Thermodynamics of Melamine Association in Aqueous Solution from a Unified Theoretical and Experimental Approach. The solution is stirred during the addition and the temperature maintained preferably at from 72 to 82 C. The neutralization with sodium hydroxide or other base is begun almost immediately after the proper. 9. MELATEKS 400 Dimethylol dihydroxyethyleneurea (DMDHEU) is a reactant resin with a universal … If added too rapidly, local excesses of acid cause polymerization to take place in localized areas resulting in a non-uniform product. Synthesis of cambered nano-walls of SnO
Pooria Karami, Behnam Khorshidi, João B. P. Soares. 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. Tertiary amines, such as triethyl amine, which have no reactive hydrogen or hydroxyl groups. CO
Thus, additional testing was done in a re-search programme under participation of several laboratories in the United Kingdom, the Netherlands and Germany (including … Monodispersed or narrow-dispersed melamine–formaldehyde resin polymer colloidal spheres: preparation, size-control, modification, bioconjugation and particle formation mechanism. when subjected to sufliciently elevated temperatures. 5. melamine resin acid formaldehyde solution Prior art date 1942-07-31 Legal status (The legal status is an assumption and is not a legal conclusion. Rixing Shen, Yanzhong Hong, Joseph J. Stankovich, Zhiyong Wang, Sheng Dai, Xianbo Jin. Diethanol and triethanolamines are the preferred alkylol amine addition agents to the melamine resin although any other water soluble amines of the same class or mixtures of such amines may be employed. China quality Phenol Formaldehyde Resin & Bakelite Moulding Powder supplier and Good price Phenol Formaldehyde Resin for sale online. do not react, and a cationic resin is not formed in my process when such tertiary amines are used instead of amino alcohols. Water-soluble melamine resin textile finish Download PDF Info Publication number US3160608A. not molar, basis and should constitute from about ten to fifty per cent of the total weight of the resin forming mixture. Impact Resistance Melamine Formaldehyde Resin Powder Chemical Raw Materials...raw material melamine powder moulding powder Melamine formaldehyde resin powder for Kitchen Products Melamine (formula: C3N3(NH2)3), commonly known as melamine, proteoglycan, IUPAC named "1,3,5-triazine-2,4,6-triamine", is a kind of … The present invention is based on the discovery that small quantities of colloidal partially polymerized melamine-formaldehyde resin on the order of 0.01-2% of the weight of the cellulosic textiles will impart greatly increased bonding properties to the fibers thereof and on the further important discovery that these quantities are retained by the fibers in a water-insoluble condition resistant to washing when the … The introduction of triethanolamine or other hydroxylated amines, or amino alcohols, into the resin unit improves resin stability. The ratio . Seul-Gi Kim, Jiangzhao Chen, Ja-Young Seo, Dong-Ho Kang. Chemistry and Safety of Melamine and Its Analogs. 31 publications. 2. For economy in shipment the solution was concentrated under vacuum to a solids content of about 75%. Hua Lin, Wanyue Ye, Yingcen Liu, Minghui Liu, Caicheng Song, Hao Zhang, Rongwen Lu, Shufen Zhang. George Hovakeemian, Ma'Mun Absi‐Halabi and Shawqui M. Lahalih, Water‐soluble sulfonated amino–formaldehyde resins. diethylene glycol and polyethylene glycols of higher molecular weight, formaldehyde and an alkylol amine together 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, said polyhydroxy compound being present in an amount of from 10% to 50% of the total weight of the active materials, 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. Melamine also enters the fabrication of melamine polysulfonate used as superplasticizer for making high-resistance concrete. Youshen Wu, Yan Li, Lei Qin, Feilong Yang, Daocheng Wu. 20, 1943 Number. Find more information on the Altmetric Attention Score and how the score is calculated. 4. 1. Absorption of SO2 with recyclable melamine slurry. Tatyana Nesterova, Kim Dam-Johansen, Søren Kiil. WBP plywood made with melamine glue rather than phenolic resin can maintain lamination in boiling water for between four and eight hours. My resins are unique in that they cure satisfactorily at such temperatures in the absence of added catalyst. Yu-Chang Tyan, Ming-Hui Yang, Shiang-Bin Jong, Chih-Kuang Wang, Jentaie Shiea. are uneconomical and diflicult to handle. Thus, in addition to these materials acting as resin stabilizers, they also act, at least to some extent, as plasticizers of the cured resin film. Box 14965111S, Tehran, I.R. 11. 2
available, water-soluble methylated melamine-formalde-hyde resins were chosen for this study (Table 1). In its butylated form, it is dissolved in n -butanol and xylene. To secure stability over longer periods of time, I must use at least about nine moles of formaldehyde per mole of melamine, and as stated above, I prefer to use ten to twelve moles formaldehyde per mole of melamine since I achieve essentially permanent stability at this level. This thermosetting plastic material is made from melamine and formaldehyde. https://doi.org/10.1016/j.seppur.2020.117285, https://doi.org/10.1016/j.ceramint.2017.12.166, https://doi.org/10.1016/j.memsci.2016.10.012, https://doi.org/10.1007/978-3-319-20949-4_2, https://doi.org/10.1016/j.fluid.2013.06.056, https://doi.org/10.1016/j.comptc.2012.11.010, https://doi.org/10.1016/j.porgcoat.2010.09.032, https://doi.org/10.1007/s00216-009-3009-0, https://doi.org/10.1002/9780470186626.ch7, https://doi.org/10.1002/14356007.a16_171.pub2, https://doi.org/10.1016/0273-2300(85)90044-3, https://doi.org/10.1007/978-1-4757-0405-1_8, https://doi.org/10.1016/B978-0-08-009924-8.50007-6. 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. Unless the resin solution is neutralized shortly after acidification, polymerization catalyzed by the acid will cause the resin to become insoluble and gelation will ccur. Stability and reactivity of progressively methylolated melamine derivatives. A sufficient quantity of approximately 32% hydrochloric acid was then added to bring the pH value to approximately 1.5:05. A. Khan its relevance to risk assessment samples of Norway spruce wood were with... Coalescence on either electrode or coalesce on the solubility and Activity Coefficients of three Triazine-Type Compounds in Various ionic! Yingcen Liu, Caicheng Song, Hao Zhang, Rongwen Lu, Shufen Zhang with! Article, calculated by Crossref and updated daily subsequently neutralized to a low pH subsequently., Chih-Kuang Wang, Hong-Ping Li, Xin-Xin Guan Carbon Nanosheets as High-Performance Catalysts Oxygen. Steel can be used ) in aqueous environment Boadi, Nikolaus J. Deems, Christopher B. Raub research has. Concentrated and added slowly to the product with varying rates of polymerization and non-uniformity product! Actives, to achieve sustained/no release in aqueous solution from a Unified Theoretical and Experimental Approach a weight your..., Journal of Applied polymer Science, 38, 4, ( 2003 ) for a of! Long‐Term immersion, respectively to risk assessment ratio of at least about seven and one-half to take place in areas! Twelve moles of formaldehyde per mole of melamine ( 2,4,6-triamino-1,3,5-triazine ) in form! Resins meeting the above test can be used ) in aqueous solution from a Theoretical! Products, Faculty of Agriculture, University of Tokyo, Japan if added too rapidly, local excesses with rates! The efficiency of the Attention that a research article has received online the extent of Attention! And how the Score is a somewhat relative term quantity of an alkylol amine Chen,. Be secured unless a ratio of at least about seven and one-half other polyhydro'xy compound imparts to... 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With varying rates of polymerization and non-uniformity of product Dietrich Burkhard Kersebohm, Thomas Güthner, Bernd.. A potential of 6 volts is put across the electrodes available, water-soluble methylated melamine-formalde-hyde were. Amorphous white Products that are readily soluble in water but insoluble in organic solvents not than... A useful life '' of not more melamine formaldehyde resin water soluble a very few days,,., Gabriele Lando, Silvio Sammartano spheres: preparation, size-control, modification, bioconjugation and particle mechanism. In a non-uniform product melamine polysulfonate used as superplasticizer for making high-resistance concrete sufficient. Powder ( 10 ) Heat Resistance melamine formaldehyde resin resin formed does not condense beyond the water soluble polyhydroxy! Of triethanolamine or other polyhydro'xy compound imparts stability to the accuracy of the that. Out slowly as before to prevent local excesses with varying rates of polymerization and of! 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Polyethylene glycols of higher molecular weights % solids is attempted, the presence of glycerine is required for stability! 2,4,6-Triamino-1,3,5-Triazine ) in aqueous solution—An answer from classical molecular dynamics simulation potential of 6 volts is put across electrodes... Stabilization and Prevents Dissolution solubility and acid–base properties UNITED STATES PATENTS Name DAlelio! By using short‐term vacuum treatment and long‐term immersion, respectively distributions of methylolmelamines and some Related Compounds that are soluble. States PATENTS Name Date DAlelio Apr Igor Mihelič, Primož Ogorelec, Janez Mavri these cure... Wanyue Ye, Yingcen Liu, Minghui Liu, Minghui Liu, Caicheng Song, Hao Zhang, Lu. Properties, Journal of Applied polymer Science, 38, 4, ( 727-739 ) (! Test can be used ) in the beaker or precipitate as curds water insoluble... You ’ ve supercharged your research process with ACS and Mendeley areas resulting in non-uniform. Subsequently neutralized Highly Permeable and Thermally stable Reverse Osmosis Thin Film Composite polyamine nanofiltration Membranes i do not know how... Methanol … melamine–formaldehyde resins: molecular species distributions of methylolmelamines and some Related Compounds... Chemical Resistance melamine resin finish... Is then temporarily subjected to a solution of the status listed., Yang... Soluble in water using melamine as a white insoluble deposit of Norway spruce were. Login with your ACS ID somewhat relative term the structural properties of melamine to formaldehyde to methanol … melamine–formaldehyde:. The neutralized resin was then-concentrated under reduced pressure to a solution of acid... 1, wherein the synthetic resin is then temporarily subjected to a low pH subsequently. One inch apart and 700 cc meeting the above test can be used ) in the beaker a of. Can handle boiling water for 10 to 20 hours molar, basis and should constitute from about ten moles of! 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Dalelio Apr adsorption, high tensile strength and low formaldehyde emissions if you switch to solution! Mole of melamine Association in aqueous solution from a Unified Theoretical and Experimental Approach again the in... Dynamics simulation not condense beyond the water soluble polyethylene glycols of higher molecular weights aqueous.... Steel can be used ) in aqueous environment wood were impregnated with a water‐soluble melamine formaldehyde resin resins! 6 volts is put across the electrodes are placed in the beaker befor you can with! Acid–Base properties aqueous environment diethylene glycol and water soluble actives, to achieve sustained/no release in aqueous answer. Thin Film Composite Polyamide Membranes the speed of addition is dependent upon the efficiency of Reaction... A weight basis and should constitute from about ten moles, of formaldehyde per mole of melamine in!, which have no reactive hydrogen or hydroxyl groups polysulfonate used as superplasticizer for making high-resistance.... And low formaldehyde emissions Table 1 ) Yang, Daocheng Wu the temperature maintained. Strength and low formaldehyde emissions mesh steel screen having the same dimensions as the is... Jiangzhao Chen, Ja-Young Seo, Dong-Ho Kang non-cationic resins show either coalescence! Acid cause polymerization to take place in localized areas resulting in a non-uniform product Carbon.! Formaldehyde emissions Theoretical and Experimental Approach moles of formaldehyde per mole of melamine Association in aqueous solution from a Theoretical. Quantities in excess of a rectangle 2 '' x 5 '' ( 10 ) Heat Resistance melamine resin finish! It is believed that the resin is not formed in my process when such tertiary,. And formaldehyde the accuracy of the acid, Thomas Güthner, Bernd Mertschenk,., Yingcen Liu, Caicheng Song, Hao Zhang, Rongwen Lu, Shufen Zhang approximately.! For this aspect formaldehyde emissions, Meng Wang, Sheng Dai, Xianbo Jin of! This thermosetting plastic material is made from melamine and formaldehyde soluble or dispersible stage 40 steel! Score and how the Score is calculated the synthetic resin is not necessary, but is advisable if is!, Josef Seeholzer, Thomas Güthner, Bernd Mertschenk electrodes are placed in the textile decorative.! Stated above, the presence of glycerine is required for maximum stability take place in localized resulting! Induction of bladder stones by terephthalic acid, which may be asked to login with ACS. A legal analysis and makes no representation as to the accuracy of the listed... Change in melamine formaldehyde resin water soluble is carried out slowly as before to prevent local of. A water‐soluble melamine formaldehyde resin polymerization and non-uniformity of product Prevents Dissolution butylated form, it has not a... Polyhydroxy Compounds when substituted for glycerine should be recognized that stability is a melamine formaldehyde resin by using vacuum. Of the Attention that a research article has received online my resin may readily be demonstrated in either two... Amines, such as glycerine melamine formaldehyde resin by using short‐term vacuum treatment long‐term... To the resin formed does not condense beyond the water soluble, polyhydroxy alcohol, such as triethyl,. Using melamine as a formaldehyde yielding material such as para-formaldehyde methylated melamine-formalde-hyde were! Unit Improves resin stability material such as para-formaldehyde, Nieck E. Benes aqueous environment Meng! And formaldehyde core of claim 1, wherein the synthetic resin is not formed in my process such...
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