DE1796313C3 - Use of aqueous solutions of sulfite-modified, non-thermosetting melamine resins as an additive to plaster of paris - Google Patents
Use of aqueous solutions of sulfite-modified, non-thermosetting melamine resins as an additive to plaster of parisInfo
- Publication number
- DE1796313C3 DE1796313C3 DE19681796313 DE1796313A DE1796313C3 DE 1796313 C3 DE1796313 C3 DE 1796313C3 DE 19681796313 DE19681796313 DE 19681796313 DE 1796313 A DE1796313 A DE 1796313A DE 1796313 C3 DE1796313 C3 DE 1796313C3
- Authority
- DE
- Germany
- Prior art keywords
- solution
- melamine
- sulfite
- resin
- modified
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 229920000877 Melamine resin Polymers 0.000 title claims description 16
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Inorganic materials [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 title claims description 10
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 title claims description 9
- 239000011507 gypsum plaster Substances 0.000 title claims description 9
- 229920001187 thermosetting polymer Polymers 0.000 title claims description 9
- 239000000654 additive Substances 0.000 title claims description 4
- 230000000996 additive Effects 0.000 title claims description 4
- 239000007864 aqueous solution Substances 0.000 title claims 5
- 229920005989 resin Polymers 0.000 claims description 21
- 239000011347 resin Substances 0.000 claims description 21
- JDSHMPZPIAZGSV-UHFFFAOYSA-N Melamine Chemical group NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims description 7
- 238000009833 condensation Methods 0.000 claims description 6
- 230000005494 condensation Effects 0.000 claims description 6
- WSFSSNUMVMOOMR-UHFFFAOYSA-N formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000004640 Melamine resin Substances 0.000 claims description 4
- WNROFYMDJYEPJX-UHFFFAOYSA-K Aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L Calcium hydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 2
- 239000000920 calcium hydroxide Substances 0.000 claims description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 2
- 238000010992 reflux Methods 0.000 claims description 2
- 239000000243 solution Substances 0.000 claims 15
- LSNNMFCWUKXFEE-UHFFFAOYSA-M bisulfite Chemical group OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 claims 5
- 239000003513 alkali Substances 0.000 claims 2
- 238000010438 heat treatment Methods 0.000 claims 2
- 238000000034 method Methods 0.000 claims 2
- ODGAOXROABLFNM-UHFFFAOYSA-N Polynoxylin Chemical compound O=C.NC(N)=O ODGAOXROABLFNM-UHFFFAOYSA-N 0.000 claims 1
- 229920001807 Urea-formaldehyde Polymers 0.000 claims 1
- 229910052783 alkali metal Inorganic materials 0.000 claims 1
- -1 alkali metal sulfite Chemical class 0.000 claims 1
- 150000001412 amines Chemical class 0.000 claims 1
- 229910052925 anhydrite Inorganic materials 0.000 claims 1
- 239000004566 building material Substances 0.000 claims 1
- 239000008098 formaldehyde solution Substances 0.000 claims 1
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 claims 1
- 229910052602 gypsum Inorganic materials 0.000 claims 1
- 239000010440 gypsum Substances 0.000 claims 1
- 150000007974 melamines Chemical class 0.000 claims 1
- 239000011148 porous material Substances 0.000 claims 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 239000011575 calcium Substances 0.000 description 4
- 229910052791 calcium Inorganic materials 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxyl anion Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating Effects 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Description
(iii) die gemäß (ii) erhaltene Lösung auf einen pH-45 Wert von 8 bis 11 einstellt und 1 bis 3 h unter Rückfluß erhitzt.(iii) adjusts the solution obtained according to (ii) to a pH-45 value of 8 to 11 and for 1 to 3 h below Heated to reflux.
Ein Zusatz von Calciumhydroxid oder Aluminiumhydroxid zum Stuckgips erweist sich dabei als beson-An addition of calcium hydroxide or aluminum hydroxide to the plaster of paris proves to be particularly
50 ders vorteilhaft. Eine bevorzugte Ausführungsform der Erfindung besteht daher in der Verwendung der50 ders advantageous. A preferred embodiment of the invention therefore consists in the use of
Die Erfindung betrifft die Verwendung von wäß- obigen Melaminharzlösungen zusammen mit Calciumtigen
Lösungen sulfitmodifizierter, nicht wärmehärt- hydroxid oder Aluminiumhydroxid,
barer Melaminharze als Zusatz zu Stuckgips zur Er- Bevorzugt verwendet werden solche Melaminharzhöhung
der Temperaturbeständigkeit von daraus her- 55 lösungen, die eine Viskosität von 16 cp bei 200C aufgestellten
Formkörpern. weisen.The invention relates to the use of aqueous above melamine resin solutions together with calcium-containing solutions of sulfite-modified, non-thermosetting hydroxide or aluminum hydroxide,
Such Melaminharzhöhung the temperature resistance are Barer melamine resins used as an additive to plaster of Paris to ER- Preferably, solutions of manufacturing thereof 55 which has a viscosity of cp 16 at 20 0 C prepared moldings. point.
Aus der DL-PS 28 836 ist ein Verfahren zur Ver- Das folgende Beispiel erläutert die Erfindung,
gütung von faserverstärkten Gipsplatten oder gips-From DL-PS 28 836 is a method for the The following example explains the invention,
treatment of fiber-reinforced plasterboard or plasterboard
haltigen Fo.mkörpern bekannt, bei dem mit einem Beispiel
vorkondensierten Präparat aus Melaminharz und 60containing Fo.mkkörern known in which with an example
precondensed preparation made of melamine resin and 60
Formaldehyd eine Oberflächenbehandlung des zu ver- In Anlehnung an DIN 1168 (Baugipse, FassungFormaldehyde is a surface treatment of the material to be used. Based on DIN 1168 (building plaster, version
gütenden Gegenstands mit nachfolgender Hitze- März 1955) wurden aus Stuckgips je 6 ProbekörperGood object with subsequent heat - March 1955) were made of stucco 6 test pieces each
härtung vorgenommen wird. Bei dem eingesetzten 4 χ 4 χ 16 cm hergestellt und bei 4O0C bis zurhardening is carried out. Manufactured at the used 4 χ 4 χ 16 cm and at 4O 0 C up to
Melaminharz handelt es sich um ein hitzehärtbares Gewichtskonstanz getrocknet. Nach Erreichen derMelamine resin is a thermosetting constant weight dried. After reaching the
Harz, das auf den zu vergütenden Gipsgegenstand 65 Gewichtskonstanz wurde bei je 3 Probekörpern dieResin, which was applied to the plaster of paris to be remunerated 65 weight constant with 3 test specimens the
nachträglich aufgebracht wird. Im übrigen betrifft Druckfestigkeit bestimmt. Je 3 Probekörper wurdenis applied subsequently. Otherwise, it relates to compressive strength. 3 test specimens each were
dieses Verfahren eine Methode zur Aushärtung des 3 Stunden bei 200°C gelagert und anschließend diethis method is a method of curing the 3 hours stored at 200 ° C and then the
eineesetzten Vorkondensats. Druckfestigkeit bestimmt.a set pre-condensate. Determined compressive strength.
Herstellung der HarzlösungPreparation of the resin solution
700 Gewichtsteile 30%iges Formalin werden mit as Natronlauge bis zum Erreichen eines pH-Wertes von 4,5 und anschließend mit 294 Gewichtsteilen Melamin versetzt. Danach wird auf 80° C erwärmt, bis sich eine klare Lösung bildet. Die Lösung wird weitere 30 Min. lang auf einer Temperatur von 800C gehalten (Vorkondensation), dann auf 450C abgekühlt und mit 222 Gewichtsteilen Na2S2O6 versetzt. Anschließend wird mit 332 Gewichtsteiien Wasser verdünnt, mit Natronlauge ein pH-Wert von 10,5 eingestellt und die Lösung 2 h bei 8O0C erwärmt. Nach Abkühlen auf 50° C wird die Lösung mit einem Gemisch aus 2116 Gewichtsteilen Wasser und 70 Gewichtsteilen konz. Schwefelsäure versetzt. Hierauf wird das Reaktionsgemisch 5 h auf 50° C gehalten (saure Kondensation) und dann mit Natronlauge auf einen pH-Wert von 8,5 eingestellt. Die alkalische, mit Vorkondensation hergestellte Harzlösung vom pH-Wert 8,5 wird noch 1 h unter Rückfluß erhitzt. Die Viskosität der Lösung beträgt dann bei 200C 16 cP (Brookfield Rot. Visk., 20 U/min, Spindel Nr. 1), der pH-Wert 6,7.As sodium hydroxide solution is added to 700 parts by weight of 30% formalin until a pH value of 4.5 is reached, and then 294 parts by weight of melamine are added. It is then heated to 80 ° C. until a clear solution forms. The solution is kept at a temperature of 80 ° C. for a further 30 minutes (precondensation), then cooled to 45 ° C. and 222 parts by weight of Na 2 S 2 O 6 are added. Water is then diluted with 332 Gewichtsteiien, adjusted with sodium hydroxide to a pH of 10.5 and the solution heated at 8O h 2 0 C. After cooling to 50 ° C, the solution is concentrated with a mixture of 2116 parts by weight of water and 70 parts by weight. Sulfuric acid added. The reaction mixture is then kept at 50 ° C. for 5 hours (acidic condensation) and then adjusted to a pH of 8.5 with sodium hydroxide solution. The alkaline resin solution with a pH of 8.5, prepared with precondensation, is refluxed for a further hour. The viscosity of the solution is then 16 cP at 20 ° C. (Brookfield Rot. Visc., 20 rpm, spindle no. 1), the pH value 6.7.
pH-Wert und Viskosität einer derartigen Lösung bleiben über Monate praktisch gleich.The pH value and viscosity of such a solution remain practically the same for months.
Claims (4)
von 8 bis 11, zusammen mit Calciumhydroxid oder3. Use of aqueous sulfite solutions - reaction of formaldehyde with M3lamin and a modified, non-thermosetting melamine 30 alkali metal sulfite, the solution of a non-thermosetting resin, the water-soluble resin for 1 to 3 hours after condensation. These melamine resins are heated at a pH of the resin solution
from 8 to 11, together with calcium hydroxide or
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19681796313 DE1796313C3 (en) | 1968-03-11 | Use of aqueous solutions of sulfite-modified, non-thermosetting melamine resins as an additive to plaster of paris |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19681796313 DE1796313C3 (en) | 1968-03-11 | Use of aqueous solutions of sulfite-modified, non-thermosetting melamine resins as an additive to plaster of paris |
Publications (3)
Publication Number | Publication Date |
---|---|
DE1796313A1 DE1796313A1 (en) | 1972-08-10 |
DE1796313B2 DE1796313B2 (en) | 1976-01-29 |
DE1796313C3 true DE1796313C3 (en) | 1976-09-30 |
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