novolac precured sand patent . Patent EP0771935A1 - Proppants with fiber reinforced resin The coated substrate particles are also useful for sand control that is acting as a filter Resin coated proppants come in two types precured and curable A typical proppant resin is a phenolic novolac resin coating composition combined More details Get ...
A phenol-formaldehyde novolac resin having a low concentration of free phenol prepared by distilling residual phenol from a molten novolac resin and replacing at least a portion of the phenol with a solvent having a volatility equal to or less than phenol. Such modified novolac resins are suitable for the production of resin coated molding sands for shell molding and sand
US4413931A US06/230,618 US23061881A US4413931A US 4413931 A US4413931 A US 4413931A US 23061881 A US23061881 A US 23061881A US 4413931 A US4413931 A US 4413931A Authority US United States Prior art keywords resin particulate novolac resins sand Prior art date 1981-02-02 Legal status (The legal status is an assumption and is not a legal
US4581253A - Process for preparing pre-cured proppant charge - Google Patents. A process for preparing a proppant charge comprising individual sand particles coated with a pre-cured thermosettable...
US4443347A US06/494,548 US49454883A US4443347A US 4443347 A US4443347 A US 4443347A US 49454883 A US49454883 A US 49454883A US 4443347 A US4443347 A US 4443347A Authority US Unite
The invention relates to pre-coated sand which comprises crude sand, an adhesive, a curing agent and a coupling agent. The amount of the curing agent accounts for 40-60 percent of the total amount of the adhesive, the amount of the coupling agent accounts for 0.2-0.5 percent of the total amount of the adhesive, the amount of the adhesive accounts for 1-1.5 percent of the
The cure of resin compositions comprising a mixture of a resole type phenol aldehyde resin and a novolac type phenol formaldehyde resin is improved by employing resorcinol as all or part of the phenolic component in the novolac type resin. The resin compositions are particularly useful as binders for foundry sand.
The invention relates to a binder composition comprising a low molecular weight poly (orthomethylolated) phenolic compound which is combined with a phenol formaldehyde novolac resin and cured in the presence of alkali and an organic ester. Low and high density aggregates can be added to the binder to produce foundry or refractory articles. The binder can also be
When sand coated with the powdered phenol formaldehyde resin is placed in a subterranean formation, the Graham, et al. patent indicates, the heat of the formation causes the resin coating to melt and, ultimately, to cure while the coating is melted, coalescence occurs between the coatings on adjacent particles so that, after cure of the ...
A pre-cured proppant charge useful, for example, for propping a fracture in a subterranean formation is disclosed. The charge is made up of a large number of particles composed of a single substrate particle which can be silica sand, glass beads, or the like, coated with a thermoset resin. The thermoset resin is one which, when it is the resin coating on particles of a proppant
There is provided a process for the production of low temperature curable proppant particles. The process includes heating particles adding a resin to coat the particles with the resin partially curing the resin and adding 0.1-2.0 parts of surfactant per 100 parts of the particles.
US2566851A US789565A US78956547A US2566851A US 2566851 A US2566851 A US 2566851A US 789565 A US789565 A US 789565A US 78956547 A US78956547 A US 78956547A US 2566851 A US2566851 A US 2566851A Authority US United States Prior art keywords phenol resins resin formaldehyde aldehydes Prior art date 1947-12-03 Legal status
Mar 05, 1996 The optimal resole to novolac ratio was determined to be that embodied in sample 3, 1-1/2% resole to 1-1/2% novolac based on its high compressive strength and low persulfate consumption. EXAMPLE 2 The following example is a description of the production of a plant size experimental batch of resin for the outer coating of particles to be used as ...
U.S. Pat. No. 4,443,347 also describes a method for propping fractures in subterranean formations using proppants comprised of sand particles with a precured phenol formaldehyde resin coating. U.S. Pat. No. 3,929,191 to Graham et al. discloses a method for producing coated particles for use in treating subterranean formations.
Nov 14, 2017 Example 56 Hydrogel Coating of Sand Samples. Sand samples were prepared by placing 20 g of the samples prepared in Example 46 through Example 54 into small FlackTek jars. 0.6 g of the coating mixture prepared in Example 35 was added into each the jar. The contents were then mixed at 800 rpm for 1 minute using a FlackTek speed mixer.
Another suitable sand for the purposes of this invention is Ottawa sand, commercially available from U.S. Silica Company of Berkeley Springs, W. Va. A particularly preferred Arizona sand for application in this invention is size 20/40 Arizona sand, and a particularly preferred Ottawa sand is size 40/70 Ottawa sand.
Patent EP2295482A1 - Manufacturing method for phenolic novolac ... 16 Mar 2011 ... The present invention relates to a production process for a phenols novolac resin and a resin-coated sand prepared by using the phenols...
Apr 19, 2018 The major conclusions from the NMR analysis are 1. At 150 F exposure test temperature, the companys curable and precured phenolic novolac RCPs showed very low total leachant levels, measuring at 0.08% by weight. The commercially available PU RCPs showed leachants up to 0.15% by weight. 2.
The precured proppant comprises free-flowing sand particles coated with the thermoset, phenolic resin thereon the thermoset, phenolic resin coating being one which, when it is the coating on the particles of a proppant charge, produces a charge wherein at least one of the Permeability Ratio thereof throughout a closure stress range of about ...
PDF Understanding the failure mechanisms of resin-coated proppants under extreme environments facilitates the development of stronger proppants for...
The present invention relates to coated particulate matter wherein the particles are individually coated with a first set of one or more layers of a curable resin, for example, a combination of phenolic/furan resin or furan resin or phenolic-furan-formaldehyde terpolymer, on a proppant such as sand, and the first set of layers is coated with a second set of one or more layers of a
A proppant comprises a particle and a polymeric coating disposed about the particle. The polymeric coating comprises the reaction product of a novolac polyol, an isocyanate, and an azole. The novolac polyol has a number average molecular weight of from about 200 to about 1000 g/mol. A method of form
Five Star Epoxy Novolac Coating is a two component system consisting of premeasured containers of resin and hardener and is available as a 2.5 gallon unit yielding coverage of approximately 200 sq. feet at 20 mil thickness.
Leaching studies on Novolac resin-coated proppants-performance, stability, product safety, and environmental health considerations ... tions has been described in the patent literature.7 The possibility of leaching, by aqueous carrier fluids, of crosslinkers and hard- ... during the coating process on the sand substrate and the other
Five Star Epoxy Novolac Coating is a two-component system consisting of premeasured containers of resin and hardener. It is available as a 3.9 gallon It is available as a 3.9 gallon (14.7 liter) unit yielding coverage of approximately 415 sq. ft. 15 mils (38.8 sq. m. 380 microns), 310 sq. ft. 20 mils (29.0 sq. m. 510 microns),
A novolac resin (Example 1) and a solid resole resin were added and mulled with the silica sand for 40 seconds. 450 g. of water (in which a predetermined amount of hexamine, if required, is dissolved) was added, and mulling was continued until the sand particles were crushed.
Sep 24, 2009 Patent application title PARTICLES FOR USE AS PROPPANTS OR IN GRAVEL PACKS, METHODS FOR MAKING AND USING THE SAME Inventors Avis Lloyd McCrary Robert R. McDaniel John W. Green Liang Xu Agents HEXION SPECIALTY CHEMICALS, INC. Assignees Origin STAFFORD, TX US IPC8 Class AC08F246FI USPC Class 427487
Mar 18, 2010 A curable resin coating is applied to a sand substrate by first applying 0.75 grams of a coupling agent (A-1100) to a 1000 gram sample of sand while applying constant agitation. A liquid resole (OWR-262E) at the concentration of 3 grams is then added to the sand/coupling agent mixture (starting 15 seconds after the addition of the coupling agent).
Jun 23, 2016 In this study on the curing dynamics of phenol-formaldehyde novolac resins (PFNR) and hexamethylene tetramine (HMTA), two typical commercial PFNR were selected as examples and the curing reactions of the resins with HMTA were studied by differential scanning calorimetry (DSC). Based on the data calculated by the Kissinger equation and the Crane
May 01, 2015 As shown in Table 2, the specific gravity of ceramic is 3.60 and sand is 2.69 therefore, ceramic is 33.8% more dense than sand. The settling velocity for ceramic proppant, as shown by Cutler et al. (1985), however, is 65% higher than sand. RCPs are significantly lighter than conventional proppants and exhibit high compressive strength.
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coated on the surface with a novolac resin containing curative for use as a proppant, gravel pack, or for sand control.7 The phenolic novolacs do not harden upon heating but remain soluble and fusible unless a hardener (crosslinking agent) is present.7 Appropriate crosslinking agents include hexamethylenetetramine, paraformaldehyde ...
Application of polymers for coating of proppant in hydraulic fracturing of subterraneous formations A comprehensive review
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In one such application is a solid Novolac resin is used to coat a suitable molding mixture for use in the production of moulds and cores as follows solid Novolac resin, usually in the form of plates, added to pre-heated sand (200-400F) (93-204C) in a suitable production device for coating at a temperature above the melting point of the ...