Chemicals Phenolic Resole Resin . Note: Please be cautious and check with your supplier if this product is for virus protection purposes and if the coronavirus (COVID-19) will affect your order. Trade Assurance. Built-in order protection service in alibaba.com. Product quality .
Download Citation | Research on Synthesizing Phenylic Phenolic Resin of Foundry Binder System | Resin in the foundry polyurethane binder is asked to be phenylic phenolic resin.The composition of ...
Sep 14, 2018· An Eco Friendly Alternative To Phenol Formaldehyde Resin. The present invention relates to eco-freindly resins, which may be used as substitute for phenolic resins comprising soy and CNSL in defined ratio. Further the use of soy and CNSL in defined ratio provides soy CNSL resin, which has high binding capacity.
A resin for coating sand and a resin-coated sand produced therefrom wherein the resin is prepared by incorporating furan into a phenolic novolak resin. In the preferred practice, the resin is produced by reaction of furfuryl alcohol with a phenolic compound at an acid pH to give a furfuryl-phenolic intermediate in a first step, and then, in a second step, reacting the furfuryl-phenolic ...
HAI's newest Phenolic Cold Box resin, Carbophen, is a water based phenolic resin system cured using CO2 gas. ... All Foundry Resin totes utilize a Cam-Lock fitting system for Part 1 and Part 2 totes. All Part 1 resins are 2" fittings, totes have white corners.
Jun 22, 2017· 5733952 Foundry binder of phenolic resole resin, polyisocyanate and epoxy resin Expired Oct 18, 95 Mar 31, 98 [C08K, B22C, C08L] 5354788 Dialdehyde modified phenolic foundry sand core binder resins, processes for making same, and process for preparing foundry cores and molds employing same Expired Sep 10, 93 Oct 11, 94 [B22C]
A phenolic resin binder useful for hot coating foundry sand and comprising a mixture of a solid resol phenolic resin and a lubricant is provided in the form of beads or rods of diameter of about 0.5 to 7 mm and a length of about 0.5 to 30 mm.
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A process for making sand cores or molds is disclosed; the completed cores and molds as well as a binder for holding the sand particles together. The resin binder is used in the process and in the finished product comprising lignin dissolved in a suitable solvent reacted on or cured with an isocyanate material. Curing can be accomplished by the use of an amine along with a catalyst if desired.
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The phenolic resin patented under 797 is a component of the foundry sand binders patented under 579 and 392. The 797 patent (entitled "Phenolic Resins Containing Benzylic Ether Linkages And Unsubstituted Para Positions"), issued in 1969, claims a phenol formaldehyde resin.
Фенольная Смола Для Тормозной Колодки,Тормозная Подкладка,Фенол-формальдегидная Смола, Find Complete Details about Фенольная Смола Для Тормозной Колодки,Тормозная Подкладка,Фенол-формальдегидная Смола,Фенольная Смола Завод ...
sand, 1-2% of phenolic resin is added during molding as part I, the acidic agent i.e. aldehyde is added in between 40-45% of weight of phenolic resin. The curing agent required for this system is a strong sulfonic acid type, however, phosphoric acids is not able to permit fast curing of phenolic resins at the rate required for foundry applications.
Refractory shaped articles are prepared by heating refractory mixes comprised of refractory particles and a liquid phenolic resole resin having a methylol group index of about 0.8 or less and a free moisture content of about 8 weight percent or less.
The present invention relates a reactive tertiary amine catalyst used in a phenolic urethane cold box process. Through the use of a reactive tertiary amine, the problems associated with vaporous amine waste streams can be eliminated. Some typical reactive tertiary amine catalysts that are useful in the present invention include 1-dimethylamino-2-propanol (DMA2P), monoethanolamine and ...
Patent 04252700 - Resin binder for foundry sand cores and molds > Claims. 1. In a solid phenolic resin composition for binding sand in a foundry sand core or mold prepared by mixing solid novolac and solid resole resin particles, wherein said resole is produced by the reaction comprising condensation of a phenol and a formaldehyde source in the ...
At the present time for modification of phenolic resins is widely used etherification of phenolic hydroxyl groups with the aim of increasing their resistance to thermal-oxidative effects. ... binders for foundry molds, abrasive and frictional materials, of phenolic antioxidants, etc. ... According to this patent from 3 moles of phenol and 1 ...
formaldehyde novolac resins for foundry *Yan Shi . , Ph. D., senior experimentalist. Her research focus is mainly on materials science and molecular spectroscopy. She has published more than . 15 papers and has been awarded 3 invention patents of China. E-mail: [email protected]. Received: 2015-09-07; Accepted: 2016-03-15 *Yan Shi . 1
Use of phenolic resins in the foundry industry. Since about 1948, Phenolic resins are used as organic binders in the so called Croning or Shell Molding Process (invented 1943 by Johannes Croning) for series production of lost molds. In this process, sand is coated with about 2% phenolic novolac and cured at 250-280°C in the presence of ...
A process for preparing modified phenolic resole resins providing improved binders for refractories and foundry cores and molds. The resins are prepared by treating a phenol with a molar excess of aldehyde in the presence of an alkaline catalyst followed by further reaction at a pH below 7 in the presence of a catalyst which promotes formation of ortho-ortho benzylic ether bridges between the ...
Essentially a Cold Setting Foundry Resin, the two-component liquid binder system (An Ester Cured Phenolic No-Bake System) offers solutions to some problems faced by many. ASTASET: Water-soluble, alkaline, phenol-formaldehyde polymer. ASTACURE: Blend of organic esters and resins. A series of hardeners/co-reactants are available which provides ...
Curatives for phenolic novolacs. Patent number 5,648,404; Issue date Jul 15, 1997; Borden Inc. Arthur Harry Gerber C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Oct 25, 1985· Finding that the British Patent described reacting novolac resins with highly reactive divalent materials 35 to produce soluble, fusible polymers which may be employed "as binders for sand (foundry resins)", the court concluded that the British Patent disclosed the use of phenolic urethanes as foundry binders. 36 The court also found that U.S ...
A process for making foundry cores and molds is disclosed as well as the core and molds which are produced as well as a sand binder. The binder is a resin which includes a lignin dissolved in a suitable solvent reacted and/or cured with an isocyanate material. The lignin used contains no more than 2% sodium ions. A polyether polyol may be added which has a functionality of greater than 3 and ...
What is claimed is: 1. A method for producing a urethane foundry binder which resists water-based coatings comprising the steps of: mixing together a polyhydroxy phenolic resole resin, at least one polyisocyanate, an epoxy resin having an epoxy functionality of at least two and soluble in the mixture, and a from about 0.1 to about 25 weight percent of paraffinic oil to form a mixture.
We claim: 1. A resin coated sand for shell molding foundry applications comprising foundry aggregates coated with phenolic resin and aromatic compounds, said aromatic compounds are selected from either or both of the following generic formulae: ##STR11## where m, n, x and y are integers and the range of aromatic compounds is about 0.5 to about 40 parts by weight aromatic compounds to 100 parts ...
The Spreparation of such resins is well-known and BO a LMM/1 531yr has been described, for example, in U.S. Patent No. 3,485,797. The phenols employed in the formation of the phenolic resin are generally any of the monohydric phenols which are used to prepare phenolic resins. Exemplary phenols include phenol itself and the cresols.
Justia - Patents - Patents and Patent Application Resources. Abstract: A foundry binder comprising furfuryl alcohol and hexaalkoxymethylmelamine is disclosed. The binder is substantially anhydrous. In using the binder it is substantially free of formaldehyde odor in the fabrication of the binder, in the production of sand shapes, and in metal foundry pouring operations.