MY102695A - Process for the preparation of urea-formaldehyde resins. - Google Patents
Process for the preparation of urea-formaldehyde resins.Info
- Publication number
- MY102695A MY102695A MYPI87002022A MYPI19872022A MY102695A MY 102695 A MY102695 A MY 102695A MY PI87002022 A MYPI87002022 A MY PI87002022A MY PI19872022 A MYPI19872022 A MY PI19872022A MY 102695 A MY102695 A MY 102695A
- Authority
- MY
- Malaysia
- Prior art keywords
- urea
- mixture
- formaldehyde
- added
- temperature
- Prior art date
Links
- 238000000034 method Methods 0.000 title abstract 3
- 229920001807 Urea-formaldehyde Polymers 0.000 title abstract 2
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 abstract 12
- 239000000203 mixture Substances 0.000 abstract 7
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 abstract 5
- 239000004202 carbamide Substances 0.000 abstract 5
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 238000010992 reflux Methods 0.000 abstract 1
- 229920005989 resin Polymers 0.000 abstract 1
- 239000011347 resin Substances 0.000 abstract 1
- 239000007787 solid Substances 0.000 abstract 1
Landscapes
- Phenolic Resins Or Amino Resins (AREA)
Abstract
UREA- FORMALDEHYDE RESINS WHICH MAY BE CURED TO GIVE PRODUCTS HAVING A LOW TOTAL EXTRACTABLE FORMALDEHYDE CONTENT ARE PREPARED BY THE FOLLOWING PROCESS: (i) AQUEOUS 30- 50% FORMALDEHYDE AND UREA ARE MIXED IN A FORMALDEHYDE: UREA MOLAR RATIO OF 2- 3:1 AT pH 6- 11, (ii) THIS MIXTURE IS HEATED TO AT LEAST 50?C, PREFERABLY TO AT LEAST OR ORGANIC ACIDIS ADDED TO BRING THE MIXTURE TO pH 0.5- 3.5, (iv) THE MIXTURE IS HEATED AT A TEMPERATURE BETWEEN 80?C, AND THE REFLUX TEMPERATURE, PREFERABLY FOR 15 MINUTES TO 1 HOUR, (v)KEEPING THE TEMPERATURE AT OR ABOVE 80?C, A BASE IS ADDED TO BRING THE MIXTURE TO pH 6.5- 9 AND (vi) UREA IS ADDED UNTIL THE FORMALDEHYDE: UREA MOLAR RATIO IS WITHIN THE RANGE 0.8- 1.8:1.IN A MODIFICATION OF THE PROCESS SOLID PARTICULATE RESINS ARE OBTAINED BY REACTING THE MIXTURE FROM STEP (v) WITH UREA AT A pH BELOW 7 TO INCREASE THE VISCOSITY THEREOF, ADDING A BASE UNTIL THE MIXTURE REACHES A pH OF 6.5- 9 AND DEHYDRATING THE RESULTING MIXTURE.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8615805A GB2192005B (en) | 1986-06-27 | 1986-06-27 | Process for the preparation of urea-formaldehyde resins |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| MY102695A true MY102695A (en) | 1992-09-30 |
Family
ID=79730921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| MYPI87002022A MY102695A (en) | 1986-06-27 | 1987-09-28 | Process for the preparation of urea-formaldehyde resins. |
Country Status (1)
| Country | Link |
|---|---|
| MY (1) | MY102695A (en) |
-
1987
- 1987-09-28 MY MYPI87002022A patent/MY102695A/en unknown
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