DE437646C - Process for the production of condensation products - Google Patents
Process for the production of condensation productsInfo
- Publication number
- DE437646C DE437646C DEI0016615D DEI0016615D DE437646C DE 437646 C DE437646 C DE 437646C DE I0016615 D DEI0016615 D DE I0016615D DE I0016615 D DEI0016615 D DE I0016615D DE 437646 C DE437646 C DE 437646C
- Authority
- DE
- Germany
- Prior art keywords
- production
- condensation
- condensation products
- formaldehyde
- parts
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G12/00—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08G12/02—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes
- C08G12/04—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds
- C08G12/10—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds with acyclic compounds having the moiety X=C(—N<)2 in which X is O, S or —N
- C08G12/12—Ureas; Thioureas
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Phenolic Resins Or Amino Resins (AREA)
Description
Verfahren zur Herstellung von Kondensationsprodukten. Das Patent ¢i6252 betrifft ein Verfahren zur Herstellung von Kondensationsprodukten aus Harnstoff oder dessen Derivaten und Formaldehyd oder dessen Polymeren durch Kondensation in Gegenwart oder Abwesenheit von Kondensationsmitteln, bei dem man im Verlauf des Kondensationsvorganges kurzwellige Strahlen einwirken läßt.Process for the production of condensation products. The patent ¢ i6252 relates to a process for the production of condensation products from urea or its derivatives and formaldehyde or its polymers by condensation in Presence or absence of condensing agents, in which one in the course of the Condensation process lets short-wave rays act.
Es wurde nun gefunden, daß es auch von Vorteil ist, die kurzwelligen Strahlen nach erfolgter Kondensation, also während des Rei-'fungsprozesses, sei es nur in diesem Stadium oder außerdem schon während des Kondensationsvorganges, zur Einwirkung zu bringen. Hierdurch wird nicht nur der Reifungsprozeß beschleunigt, sondern es werden auch Trübungen der ganzen Masse oder stellenweise Flekken, die manchmal auftreten, vermieden oder in kurzer Zeit beseitigt.It has now been found that it is also advantageous to use the short-wave Rays after condensation has taken place, i.e. during the ripening process it only at this stage or also during the condensation process, to take effect. This not only speeds up the ripening process, but there are also opacities of the whole mass or spots in places which sometimes occur, avoided or eliminated in a short period of time.
Beispiel. In eine q.o° warme Mischung von 5 Teilen 8oprozentiger Ameisensäure und 3oo Teilen 3oprozentigem Formaldehyd läßt man unter Bestrahlung mit einer Quarzquecksilberlampe eine auf 75° angewärmte Lösung von 6o Teilen Harnstoff in 6ö Teilen Wasser einfließen. Man nimmt die Reaktion in einem für ultraviolettes Licht durchlässigen Quarzglasgefäß vor, oder man kann auch die Lichtquelle in den Reaktionsraum selbst einführen. Die Lösung kommt sehr rasch zum Sieden und wird ungefähr 1/4 Stunde unter Rückfluß im Kochen gehalten. Dann wird unter vermindertem Druck bei ¢o° so lange Wasser und überschüssiger Formaldehyd abgetrieben, bis die zurückbleibende Lösung sirupdick geworden ist, diese wird sodann in geeignete Formen gegossen.Example. In a q.o ° warm mixture of 5 parts of 8% formic acid and 300 parts of 3% formaldehyde are left under irradiation with a quartz-mercury lamp a solution, warmed to 75 °, of 60 parts of urea in 60 parts of water is poured in. The reaction is taken in a quartz glass vessel that is permeable to ultraviolet light before, or you can introduce the light source into the reaction space itself. the Solution comes to the boil very quickly and is about 1/4 hour under reflux in the Kept cooking. Then under reduced pressure at 0 ° for so long water and Excess formaldehyde is driven off until the remaining solution is syrupy has become, this is then poured into suitable molds.
Während der nun folgenden Härtung an der Luft läßt man ebenfalls ultraviolettes Licht einwirken. Anfänglich öfters auftretende Trübungen und Flecken im Glase werden vermieden oder wenigstens schneller beseitigt, als wenn die Bestrahlung mit der Quarzquecksilberlampe unterbleibt.During the curing in air that now follows, ultraviolet rays are also left in Act on light. At first, there will be cloudiness and stains in the glass avoided or at least eliminated more quickly than if the irradiation with the Quartz-mercury lamp is omitted.
Eine nach einem der bekannten Verfahren ohne Anwendung der Quecksilberlampe hergestellte Platte aus Harnstoff-Formaldehyd-Glas zeigt gewöhnlich in den ersten Tagen der Härtung eine rasch zunehmende weiße Trübung, die das anfangs glasklare Produkt undurchsichtig macht und erst nach längerer Zeit wieder verschwindet, wenn die Platte dem Tageslicht ausgesetzt wird.One by one of the known methods without the use of the mercury lamp made of urea-formaldehyde glass usually shows in the first Days of hardening a rapidly increasing white cloudiness, which is initially crystal clear Makes the product opaque and only disappears again after a long time if the plate is exposed to daylight.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEI0016615D DE437646C (en) | 1923-01-31 | 1924-11-18 | Process for the production of condensation products |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEI0008196D DE416252C (en) | 1923-01-31 | 1923-01-31 | Process for the production of condensation products |
DEI0016615D DE437646C (en) | 1923-01-31 | 1924-11-18 | Process for the production of condensation products |
Publications (1)
Publication Number | Publication Date |
---|---|
DE437646C true DE437646C (en) | 1926-11-25 |
Family
ID=6994346
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEI0016615D Expired DE437646C (en) | 1923-01-31 | 1924-11-18 | Process for the production of condensation products |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE437646C (en) |
-
1924
- 1924-11-18 DE DEI0016615D patent/DE437646C/en not_active Expired
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