DOCSLIB.ORG

(19) United States (12) Patent Application Publication (10) Pub

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
(19) United States (12) Patent Application Publication (10) Pub US 20140178624A1 (19) United States (12) Patent Application Publication (10) Pub. No.: US 2014/0178624 A1 Tilford (43) Pub. Date: J 1111. 26, 2014 (54) BASE-MEDIATED HYDROPHOBING Publication Classi?cation COMPOSITIONS AND PROCESSES (5 1) Int. Cl. (71) Applicant: Georgia-Paci?c Gypsum LLC, Atlanta, C04B 11/00 (2006.01) GA (US) E04C 2/26 (2006.01) _ _ _ (52) US. Cl. (72) Inventorl Robert Wllllam Tllford, Stone CPC .. C04B 11/00 (2013.01); E04C 2/26 (2013.01) Mountaln, GA (US) USPC ............................ .. 428/67; 106/781; 106/678 (73) Assignee: Georgia-Paci?c Gypsum LLC, Atlanta, GA (US) (57) ABSTRACT (21) APP1~ NO-3 14/ 108,713 Water-resistant gypsum boards and compositions and meth _ _ ods for their manufacture are provided. The methods include (22) Flled' Dec“ 17’ 2013 forming a mixture of water, hydroxide, and siliconate, adding Related US. Application Data slloxane'to the mixture, adding calcmm sulfate hemi-hydrate to the mixture to form an aqueous slurry, cunng the aqueous (60) Provisional application No. 61/739,862, ?led on Dec. slurry under heat, drying the aqueous slurry, and forming a 20, 2012. water-resistant gypsum board. US 2014/0178624 A1 Jun. 26, 2014 BASE-MEDIATED HYDROPHOBING includes a gypsum core that is made of a mixture of calcium COMPOSITIONS AND PROCESSES sulfate hemi-hydrate, siloxane, hydroxide, and a ?brous mat at least partially penetrating a surface of the gypsum core. In CROSS-REFERENCE TO RELATED certain embodiments, the gypsum core also includes silicon APPLICATIONS ate. [0001] This application claims priority to US. Provisional [0009] In yet another aspect, a composition for the manu Application No. 61/739,862, ?led Dec. 20, 2012, which is facture of gypsum board is provided, including calcium sul incorporated herein by reference in its entirety. fate hemi-hydrate, hydroxide, and siloxane. In certain BACKGROUND embodiments, the composition also includes siliconate. [0002] The present invention relates generally to the ?eld of DETAILED DESCRIPTION gypsum boards, and more particularly to water-resistant gyp sum boards and methods for their manufacture. [0010] Disclosed herein are water-resistant gypsum boards [0003] Gypsum boards are commonly used as the exterior sheathing panels in building construction. Because sheathing and methods for their manufacture. As used herein, the term panels may be exposed to water or high humidity, gypsum “water-resistant” refers to the ability of a prefabricated gyp boards for these applications should be water-resistant to sum product, such as a gypsum board, to limit the uptake of reduce or eliminate: loss of board strength, microbiological water by the gypsum substrate and retain the dimensional growth, and delamination of facings. Accordingly, many stability and mechanical integrity of the product. For attempts have been made to improve the water-resistance of example, water resistance may be measured by the amount of the set gypsum that forms the gypsum boards, which has a water uptake by a gypsum product when immersed in water tendency to absorb water. for a set period. [0004] These attempts have included the incorporation of [0011] Gypsum boards are commonly made by mixing cal water-resistant additives such as metallic soaps, asphalts, cined calcium sulfate dihydrate, such as calcium sulfate siloxanes, and resins into the gypsum slurry, as well as coat hemi-hydrate, with water and any additives to form a slurry. ing ?nished gypsum boards with water-resistant ?lms or coat In the slurry, the calcined gypsum reacts with water to form ings. For example, one siloxane additive that has been used to calcium sulfate dihydrate, which may be formed and dried to improve the water-resistance of gypsum products is polym produce a fairly hard and rigid product referred to as set ethylhydrogensiloxane (PMHS). Generally, a small amount sum. of siloxane is added to the gypsum slurry before the board is formed and dried. It has been observed, however, that the [0012] The boards described herein utilize a siloxane addi siloxane frequently does not completely cure in a reasonable tive to impart water-resistance properties to the set gypsum. period of time or never completely cures. In these cases, the Upon curing the siloxane, it is believed that the polymers water resistance does not develop to a satisfactory level and crosslink to form a hydrophobic barrier. Curing of the silox the siloxane can be released as aVOC from the ?nished board. ane may be done thermally and/or with curing agents. In [0005] It has been determined that for such siloxane addi certain embodiments, the siloxane has the structure: tives to cure properly during the gypsum board manufacture process, they may be thermally cured or cured with a curing agent. For example, curing agents may include siliconates, such as potassium methyl siliconate or sodium methyl sili conate. When a thermal siloxane curing process only is used, it is critical that the temperature of the slurry reach curing temperature. Otherwise, the siloxane curing reaction may not be completed for sometime after manufacture. Curing agents must be provided in amounts that do not cure the siloxane too wherein R1 is H, halogen, alkyl, aryl, heteroaryl, cycloalkyl, rapidly and do not interfere with the rehydration and setting of haloalkyl, haloaryl, perhaloalkyl, or perhaloaryl, R2 is H, the gypsum during the board manufacturing process. halogen, alkyl, aryl, heteroaryl, cycloalkyl, haloalkyl, [0006] Accordingly, it would be desirable to provide haloaryl, perhaloalkyl, or perhaloaryl, and n is 1-100. For improved water-resistant gypsum boards utiliZing siloxanes, example, the siloxane may be poly(methylhydrogensiloxane) and methods and compositions for their manufacture. (PMHS), which has a single hydrogen atom directly bonded to the silicon atom in the backbone. The other substituent may SUMMARY be any alkyl group or halogen substituted alkyl chain. For example, PMHS may include XIAMETER 1107, which is [0007] In one aspect, a method is provided for making a water-resistant gypsum board. The method includes forming commercially available from Dow Corning Corporation a mixture of water, hydroxide, adding siloxane to the mixture, (Midland, Mich.), or BLUESIL WR 68, which is commer adding calcium sulfate hemi-hydrate to the mixture to form an cially available from Bluestar Silicones USA (East Brun aqueous slurry, curing the aqueous slurry under heat, drying swick, N.J.). the aqueous slurry, and forming a water-resistant gypsum [0013] Siliconate may be used as a curing agent for silox board. In certain embodiments, the mixture also includes ane-containing gypsum boards. It is believed that the basic siliconate. siliconate accelerates the curing process of the siloxane by [0008] In another aspect, water-resistant gypsum boards increasing the pH of the slurry containing the siloxane, are provided that are made from the methods described thereby catalyZing polymer crosslinking. In certain embodi herein. In one embodiment, a water-resistant gypsum board ments, a siliconate curing agent has the structure: US 2014/0178624 A1 Jun. 26, 2014 [0019] In certain embodiments, the hydroxide includes sodium hydroxide, potassium hydroxide, lithium hydroxide, or a combination thereof. The hydroxide may be a metal hydroxide. For example, the hydroxide may be sodium OM hydroxide, potassium hydroxide, lithium hydroxide, rubidium hydroxide, caesium hydroxide, francium hydrox ide, calcium dihydroxide, magnesium dihydroxide, beryl wherein R is H, halogen, alkyl, aryl, heteroaryl, cycloalkyl, lium dihydroxide, strontium dihydroxide, barium dihydrox haloalkyl, haloaryl, perhaloalkyl or perhaloaryl, and M, in ide, and radium dihydroxide or a combination thereof. For each occurrence independently, is sodium, potassium, or example, the hydroxide may be in solid form or in solution lithium. For example, the siliconate may be sodium methyl form. In one embodiment, a hydroxide solution may include siliconate, potassium methyl siliconate, or a combination hydroxide in an amount from about 10 to about 50 weight thereof. percent in water. For example, the hydroxide solution may [0014] It is generally believed that strong bases should not include hydroxide in an amount of about 20 weight percent in be used as curing agents because the higherpH interferes with water. the rehydration of the gypsum in the slurry and may be cor [0020] In certain embodiments, the siliconate has the struc rosive to the gypsum. However, because water chemistry may ture: vary based on manufacturing conditions, weak bases may not raise the pH of the slurry to the level necessary to completely cure the siloxane. Without being bound by a particular theory, Applicants believe certain siloxanes require a pH of 9 or above to cure. Water may have a pH of aron 6-8. Thus, the addition of a relatively small amount of a weak base to the OM gypsum slurry containing a siloxane may not be effective to cause the pH adjustment necessary to cure the siloxane. [0015] Applicant has surprisingly found that hydroxides, wherein R is H, halogen, alkyl, aryl, heteroaryl, cycloalkyl, such as sodium hydroxide, potassium hydroxide, lithium haloalkyl, haloaryl, perhaloalkyl, or perhaloaryl; and M, in hydroxide, or combinations thereof, may replace or be used in each occurrence independently, is sodium, potassium, or combination with current curing agents, without causing cor lithium. For example, the siliconate may be sodium methyl rosion of the gypsum or interfering with its rehydration. siliconate, potassium methyl siliconate,
Load more

Recommended publications
  • Chemical Names and CAS Numbers Final
    Chemical Abstract Chemical Formula Chemical Name Service (CAS) Number C3H8O 1‐propanol C4H7BrO2 2‐bromobutyric acid 80‐58‐0 GeH3COOH 2‐germaacetic acid C4H10 2‐methylpropane 75‐28‐5 C3H8O 2‐propanol 67‐63‐0 C6H10O3 4‐acetylbutyric acid 448671 C4H7BrO2 4‐bromobutyric acid 2623‐87‐2 CH3CHO acetaldehyde CH3CONH2 acetamide C8H9NO2 acetaminophen 103‐90‐2 − C2H3O2 acetate ion − CH3COO acetate ion C2H4O2 acetic acid 64‐19‐7 CH3COOH acetic acid (CH3)2CO acetone CH3COCl acetyl chloride C2H2 acetylene 74‐86‐2 HCCH acetylene C9H8O4 acetylsalicylic acid 50‐78‐2 H2C(CH)CN acrylonitrile C3H7NO2 Ala C3H7NO2 alanine 56‐41‐7 NaAlSi3O3 albite AlSb aluminium antimonide 25152‐52‐7 AlAs aluminium arsenide 22831‐42‐1 AlBO2 aluminium borate 61279‐70‐7 AlBO aluminium boron oxide 12041‐48‐4 AlBr3 aluminium bromide 7727‐15‐3 AlBr3•6H2O aluminium bromide hexahydrate 2149397 AlCl4Cs aluminium caesium tetrachloride 17992‐03‐9 AlCl3 aluminium chloride (anhydrous) 7446‐70‐0 AlCl3•6H2O aluminium chloride hexahydrate 7784‐13‐6 AlClO aluminium chloride oxide 13596‐11‐7 AlB2 aluminium diboride 12041‐50‐8 AlF2 aluminium difluoride 13569‐23‐8 AlF2O aluminium difluoride oxide 38344‐66‐0 AlB12 aluminium dodecaboride 12041‐54‐2 Al2F6 aluminium fluoride 17949‐86‐9 AlF3 aluminium fluoride 7784‐18‐1 Al(CHO2)3 aluminium formate 7360‐53‐4 1 of 75 Chemical Abstract Chemical Formula Chemical Name Service (CAS) Number Al(OH)3 aluminium hydroxide 21645‐51‐2 Al2I6 aluminium iodide 18898‐35‐6 AlI3 aluminium iodide 7784‐23‐8 AlBr aluminium monobromide 22359‐97‐3 AlCl aluminium monochloride
    [Show full text]
  • 6.2 Electron Configuration and the Periodic Table
    CK-12 Chemistry - Intermediate Quizzes and Tests Donald Calbreath, Ph.D. Say Thanks to the Authors Click http://www.ck12.org/saythanks (No sign in required) www.ck12.org AUTHOR Donald Calbreath, Ph.D. To access a customizable version of this book, as well as other interactive content, visit www.ck12.org CK-12 Foundation is a non-profit organization with a mission to reduce the cost of textbook materials for the K-12 market both in the U.S. and worldwide. Using an open-source, collaborative, and web-based compilation model, CK-12 pioneers and promotes the creation and distribution of high-quality, adaptive online textbooks that can be mixed, modified and printed (i.e., the FlexBook® textbooks). Copyright © 2015 CK-12 Foundation, www.ck12.org The names “CK-12” and “CK12” and associated logos and the terms “FlexBook®” and “FlexBook Platform®” (collectively “CK-12 Marks”) are trademarks and service marks of CK-12 Foundation and are protected by federal, state, and international laws. Any form of reproduction of this book in any format or medium, in whole or in sections must include the referral attribution link http://www.ck12.org/saythanks (placed in a visible location) in addition to the following terms. Except as otherwise noted, all CK-12 Content (including CK-12 Curriculum Material) is made available to Users in accordance with the Creative Commons Attribution-Non-Commercial 3.0 Unported (CC BY-NC 3.0) License (http://creativecommons.org/ licenses/by-nc/3.0/), as amended and updated by Creative Com- mons from time to time (the “CC License”), which is incorporated herein by this reference.
    [Show full text]
  • United States Patent [191 [11] 3,807,956 Morin [45] Apr
    United States Patent [191 [11] 3,807,956 Morin [45] Apr. 30, 1974 [54] MODIFIED BIURET REAGENT FOR GLASS STORAGE AND METHOD Primary Examiner—Morris O. Wolk [75] Inventor: Leo G. Morin, Miami, Fla. Assistant Examiner—-R. E. Serwin Attorney, Agent, or Firm-Fisher, Christen & Sabol [73] Assignee: The First National Bank of Miami, Miami, Fla. [22] Filed: Aug. 30, 1972 [21} Appl. No.: 284,880 [57] CT [52] US. Cl. ......... .. 23/230 B, 23/230 R, 23/253 R, A modi?cation of the biuret reagent with zirconium 252/408 and reduced alkalinity to make the reagent suitable [51] Int. Cl. ......................................... .. G0ln 33/16 for storage in glass is disclosed. The performance of [58] Field of Search .................. .. 23/230 B; 252/408 the modi?ed reagent in measuring protein is not re duced. [56] References Cited UNITED STATES PATENTS 11 Claims, No Drawings 3,310,382 3/1967 Kingsley .......................... .. 23/230 B 3,807,956 , 1 2 MODIFIED BIURET REAGENT FOR GLASS Such biuret reagents often contain other non STORAGE AND METHOD essential ingredients, and this invention covers such bi— uret reagents. The biuret reagents often contain copper chelating agents,~such' as sodium potassium tartrate, ci BACKGROUND OF THIS INVENTION trates and ethylenediamine tetracetic acid, and ingredi 1. Field of 'this Invention ents, such as potassium iodide. The biuret reagent also This invention relates to a modi?cation of the biuret contains surfactants, such as the Tritons, e.g., Triton reagent so that it may be stored in glass. X-lOO and Triton X-l55, sodium salts of high molecu 2.
    [Show full text]
  • (12) United States Patent (10) Patent No.: US 7,892,351 B1 Kirkpatrick Et Al
    US007892351B1 (12) United States Patent (10) Patent No.: US 7,892,351 B1 Kirkpatrick et al. (45) Date of Patent: Feb. 22, 2011 (54) COMPOSITION OF MATERIALS AND 6,554,894 B2 * 4/2003 Styronet al. ................ 106,705 PROCESSES FOR MAKING 6,932,344 B1 8/2005 Soto BORONCITRATES TO CREATE CEMENTS 7,125,944 B2 10/2006 Yamashita et al. WITH FIELD ADJUSTABLE SET TIMES 7,179,453 B1* 2/2007 Montgomery ..... ... 424/73 7,236,290 B1* 6/2007 Zhang et al. ................ 359,296 7,503.974 B2 3/2009 Mintz et al. (76) Inventors: William D. Kirkpatrick, 1431 S. Ocean 2008/0282938 A1 11/2008 Cifuentes et al. Blvd. #64, Lauderdale by the Sea, FL (US) 33062-7302: Carole W. FOREIGN PATENT DOCUMENTS Kirkpatrick, 1431 S. Ocean Blvd. #64, Lauderdale by the Sea, FL (US) WO WO 02/26458 A1 4/2002 33062-73O2 OTHER PUBLICATIONS JP 592 19377 Asahi Chemical Co. (Feb. 10, 1984) Machine transla (*) Notice: Subject to any disclaimer, the term of this tion into English.* patent is extended or adjusted under 35 JP 2005 179091 (Jul. 7, 2005) Kushihaashi et al., abstract only.* U.S.C. 154(b) by 0 days. JP 2005 179091 (Jul. 7, 2005) Kushihashi et al. Machine translation into English.* (21) Appl. No.: 12/504,192 JP 02051457 A (Feb. 21, 1990) Sasagawa et al., abstract only.* JP 02051457 A (Feb. 21, 1990) Sasagawa et al. Machine translation (22) Filed: Jul. 16, 2009 into English.* Note: All non-patent documents with asterisk were cited in related Related U.S.
    [Show full text]
  • Occo to Exchangabe Cations -- Na Ca
    USOO732675OB1 (12) United States Patent (10) Patent No.: US 7,326,750 B1 Isik et al. (45) Date of Patent: Feb. 5, 2008 (54) EXPANDED NANOCLAYS AND METHOD OF OTHER PUBLICATIONS PRODUCING SUCH EXPANDED NANOCLAYS Abstract Only—Sidheswaran et al., “Intercalation of Salts of Fatty Acids into Kaolinite” Clays and Clay Minerals; vol. 38 (1); Feb. (76) Inventors: Kivanc Isik, Kurtulus 2014, Sok. Ulker 1990; pp. 29-32. Apt. No:1/9, Aydin (TR) 09020; Abstract Only—Grigor'eva et al.; “Mechanochemical Synthesis Gokhan Andi, 1722 Cambridge Rd., of Dispersed Composites with Layer Structure from Kaolinite and Ann Arbor, MI (US) 48104 Some Organic and Inorganic Acids:IR Study Inorganic Materials; vol. 32 (2): 1996; pp. 194-199. (*) Notice: Subject to any disclaimer, the term of this Chou et al.: “Unusual Intercalation of Cationic Smectite Clays with patent is extended or adjusted under 35 Detergent-Ranged Carboxylic Ions' Macromolecular Rapid Com U.S.C. 154(b) by 0 days. munications; vol. 26 (23); Dec. 2, 2005; pp. 1841-1845. (21) Appl. No.: 11/548,748 * cited by examiner (22) Filed: Oct. 12, 2006 Primary Examiner Jerry A. Lorengo Assistant Examiner Shuangyi Abu-Ali (51) Int. Cl. (74) Attorney, Agent, or Firm—IP Authority, LLC; Ramraj C08 3/34 (2006.01) Soundararajan B32B5/16 (2006.01) C09K 3/00 (2006.01) (57) ABSTRACT (52) U.S. Cl. ...................... 524/445; 524/446; 428/328; 51.6/101 (58) Field of Classification Search ............ 106/287.17 A method of producing nanoclays comprising the steps of See application file for complete search history. preparing a first intercalant alkali Salt of a carboxylic acid, (56) References Cited adding the first intercalant to a Swelled clay at a temperature of at least 50° C.
    [Show full text]
  • 1 This Is a Generic Chemistry 134 Syllabus. Specific Dates and Times
    This is a generic Chemistry 134 Syllabus. Specific dates and times will be given in a handout at the beginning of the term. Class Syllabus Summer II 2011 CHE 134 General Chemistry II Name: R.H. Langley Email: [email protected] Website: www.faculty.sfasu.edu/langleyricha Phone: (936) 468-3606 Office Hours: MW afternoons Class meeting time and place: 10:15-12:10 MTWR, NM132 Course Requirements: The student is expected to report to class on time, work homework problems in a timely basis, and take all quizzes and exams. Note: Chemistry 134L is a co-requisite for this course. You must enroll in Chemistry 134L, unless you already have credit for the course, and if you drop either co-requisite course, you must drop them both. This may have unforeseen consequences if dropping four hours drops you below the minimum of 12 hours required to be a full- time student. In addition, dropping both courses will count as two of your allowed course drops. The consequences may include loss of financial aid and student discounts on insurance. Note: Various announcements may be emailed to you throughout the term; it is your responsibility to check your email periodically. Attendance Policy: See SECTION V I. TEXT AND MATERIALS: N.J. Tro, Chemistry A Molecular Approach, Pearson/Prentice Hall, Upper Saddle River, NJ, 2008; additional material may be available on the instructor’s website. II. POINTS AVAILABLE: 4 Exams (1 hour long, 100 points each) 400 points 1 Final (2 hours long, 200 points) 200 points Unannounced Quizzes ??? points 600 points 1) The term "Final" refers only to the final exam.
    [Show full text]
  • (12) United States Patent (10) Patent No.: US 9.222,913 B2 Deschamps Et Al
    US009222913B2 (12) United States Patent (10) Patent No.: US 9.222,913 B2 Deschamps et al. (45) Date of Patent: Dec. 29, 2015 (54) ANALYSIS AND ASSAY OF GLYCATED FOREIGN PATENT DOCUMENTS HAEMOGLOBINS BY CAPILLARY ELECTROPHORESIS, BUFFER EP 1659 398 A1 5, 2006 COMPOSITIONS AND KITS FOR JP 6-5O2244 3, 1994 CAPLLARY ELECTROPHORESS (Continued) (75) Inventors: Gérald Deschamps, Ury (FR); Frédéric OTHER PUBLICATIONS Robert, Mennecy (FR); Denis Simonin, Evry (FR) Margo P. Cohen, Rex S. Clements, Measuring Glycated Proteins: Clinical and Methodological Aspects, Diabetes Technology & Thera (73) Assignee: SEBIA, Lisses (FR) peutics, vol. 1, No. 1, pp. 57-70 (1996).* (*) Notice: Subject to any disclaimer, the term of this (Continued) patent is extended or adjusted under 35 U.S.C. 154(b) by 199 days. Primary Examiner — J. Christopher Ball (21) Appl. No.: 12/827,795 Assistant Examiner — Maris R. Kessel (74) Attorney, Agent, or Firm — Birch, Stewart, Kolasch & (22) Filed: Jun. 30, 2010 Birch, LLP (65) Prior Publication Data US 2011 FOOOO788A1 Jan. 6, 2011 (57) ABSTRACT The invention relates to a method for analysis by capillary (30) Foreign Application Priority Data electrophoresis of glycated haemoglobins comprising at least Jul. 1, 2009 (FR) ...................................... O9 O322O one globin chain comprising a glucose residue bound to the amino acid in the N-terminal position, contained in a biologi (51) Int. Cl. cal sample, said method comprising using a buffer composi G0IN 27/447 (2006.01) tion comprising at least one compound which is capable of (52) U.S. Cl. specifically complexing glucose residues of one or several CPC ................................ G0IN 2744747 (2013.01) glycated haemoglobin(s) and of providing said glycated hae moglobin(s)with several negative electric charges at an alka (58) Field of Classification Search line pH.
    [Show full text]
  • EDEXCEL INTERNATIONAL GCSE (9 –1) Change to Subject CHEMISTRY Student Book Content All Jim Clark, Steve Owen, Rachel Yu Proof
    2017 ©Pearson part. in or whole Jim Clark, Steve Owen, Rachel Yu Rachel Owen, Jim Clark, Steve Student Book CHEMISTRY GCSE(9 INTERNATIONAL EDEXCEL in included eBook distribution or circulation resale, for Not discretion. publisher at change to subject content all –1) proof, Uncorrected 2017 ©Pearson part. in or Student Book CHEMISTRY GCSE(9 INTERNATIONAL EDEXCEL whole Rachel Yu Rachel Steve Owen Jim Clark in distribution or circulation resale, for Not discretion. publisher at change to subject content all –1) proof, Uncorrected CONTENTS 2017 ©Pearson part. in or INDEX GLOSSARY APPENDICES CHEMISTRY ORGANIC UNIT 4: ENERGETICS UNIT 3: CHEMISTRY INORGANIC UNIT 2: PRINCIPLESOFCHEMISTRY UNIT 1: INTRODUCTION whole in distribution or circulation resale, for Not discretion. publisher at change to subject content all proof, 334 327 319 254 206 140 Uncorrected 02 VI v 2017 ©Pearson part. in or in trains thatlevitate abovethetracks. in trains used thatare superconductors development ofthesenewmaterials, forinstancehigh-temperature involvedinthe chemistsare Inorganic properties. fornewmaterials withexciting searching always scientistsare of themostimportant materials thatweuseineveryday life.However, some metalsandtheseare are Table and theircompounds.MostoftheelementsinPeriodic chemistsasaguideto understandingthebehaviourofelements principle usedbyinorganic unifying Table isthegreat Periodic andtheyformahugevarietyofcompounds.The different very oftheseelementsare compoundsformedbycarbon.Theproperties organic form, except andthecompoundsthey Table
    [Show full text]
  • Magnesium Hydroxide - Wikipedia, the Free Encyclopedia
    Magnesium hydroxide - Wikipedia, the free encyclopedia http://en.wikipedia.org/wiki/Magnesium_hydroxide Magnesium hydroxide From Wikipedia, the free encyclopedia Magnesium hydroxide is an inorganic compound with Magnesium hydroxide the chemical formula Mg(OH)2. As a suspension in water, it is often called milk of magnesia because of its milk-like appearance. The solid mineral form of IUPAC name magnesium hydroxide is known as brucite. Magnesium hydroxide Other names Magnesium hydroxide is a common component of Milk of Magnesia antacids and laxatives; it interferes with the absorption Identifiers [2] of folic acid and iron. Magnesium hydroxide has low CAS number 1309-42-8 solubility in water, with a K of 1.5×10−11; all of PubChem 14791 sp RTECS OM3570000 magnesium hydroxide that does dissolve does number dissociate. Since the dissociation of this small amount Properties of dissolved magnesium hydroxide is complete, Molecular Mg(OH) 2 magnesium hydroxide is considered a strong formula electrolyte. Its low solubility makes it a weak base. Molar mass 58.3197 g/mol Appearance White solid Density 2.3446 g/cm3 Melting point Contents 350 °C (decomp.) Solubility in 1.2 mg/100 mL 1 History water 2 Preparation Solubility 1.5×10-11 3 Uses product, K sp 4 Biological metabolism Refractive 1.559[1] index (n ) 5 References D Thermochemistry Std enthalpy –925 kJ/mol of History formation Δ Ho In 1829, Sir James Murray used a fluid magnesia f 298 Standard 63 J K–1 mol–1 preparation of his own design to treat the Lord molar Lieutenant of Ireland, the Marquis of Anglesey.
    [Show full text]
  • SCIENCE 10 a TEACHING RESOURCE Iii Activity 38: Matching Data, Graphs, and Words
    Qu D es i s I n ti c ves o o n , tig v e a S t r e, ! CIE N CE 1 0 AA TTEEAACCHINHINGG RRESESOOURURCCEE SCIENCE 10 Website References Website references contained within this document are provided solely as a convenience and do not constitute an endorsement by the Department of Education of the content, policies, or products of the referenced website. The department does not control the referenced websites and is not responsible for the accuracy, legality, or content of the referenced websites or for that of subsequent links. Referenced website content may change without notice. School boards and educators are required under the department’s Public School Network Access and Use Policy to preview and evaluate sites before recommending them for student use. If an outdated or inappropriate site is found, please report it to [email protected]. Science 10: A Teaching Resource © Crown copyright, Province of Nova Scotia, 2012 Prepared by the Department of Education The contents of this publication may be reproduced in part provided the intended use is for non-commercial purposes and full acknowledgment is given to the Nova Scotia Department of Education. Where this document indicates a specific copyright holder, permission to reproduce the material must be obtained directly from that copyright holder. Photographs and student text and artwork may not be extracted or reused. Cataloguing-in-Publication Data Main entry under title. Science 10 / Nova Scotia. Department of Education. English Program Services. ISBN: 978-1-55457-459-9 1. Science—Study and teaching—Handbooks manuals, etc. I.
    [Show full text]