DE968367C - Process for the production of shaped bodies from shredded wood - Google Patents
Process for the production of shaped bodies from shredded woodInfo
- Publication number
- DE968367C DE968367C DEB23545A DEB0023545A DE968367C DE 968367 C DE968367 C DE 968367C DE B23545 A DEB23545 A DE B23545A DE B0023545 A DEB0023545 A DE B0023545A DE 968367 C DE968367 C DE 968367C
- Authority
- DE
- Germany
- Prior art keywords
- production
- shaped bodies
- shredded wood
- wood
- formaldehyde
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N1/00—Pretreatment of moulding material
- B27N1/006—Pretreatment of moulding material for increasing resistance to swelling by humidity
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Phenolic Resins Or Amino Resins (AREA)
Description
AUSGEGEBEN AM 6. FEBRUAR 1958ISSUED FEBRUARY 6, 1958
B23545 Ib/381B23545 Ib / 381
Zusa,tz zum Patent 921Addition to patent 921
Das Hauptpatent 921 051 betrifft ein Verfahren zur Herstellung von Formkörpern aus zerkleinertem Holz, bei dem man zerkleinertes Holz mit Lösungen von niedermolekularen Kondensationsprodukten aus mehrwertigen Urethanen und Formaldehyd imprägniert, trocknet und dabei härtet und nach Aufbringung eines Bindemittels zu Formkörpern verpreßt.The main patent 921 051 relates to a method for the production of moldings from shredded wood, in which shredded wood is mixed with solutions of low molecular weight condensation products from polyvalent urethanes and formaldehyde impregnates, dries and hardens in the process and, after application of a binder, to form molded articles pressed.
Es wurde nun gefunden, daß man zu gleich guten Ergebnissen kommt, wenn man das Imprägnieren des zerkleinerten Holzes, vorzugsweise Holzspäne, mit Lösungen von niedermolekularen Kondensationsprodukten aus mehrwertigen Urethanen und Formaldehyd und danach die Aufbringung eines Bindemittels, ohne die bei dem Verfahren des Hauptpatents vorgesehene Zwischenhärtung durchzuführen, vornimmt.It has now been found that equally good results are obtained if the impregnation is carried out of the chopped up wood, preferably wood chips, with solutions of low molecular weight condensation products from polyvalent urethanes and formaldehyde and then the application of a binder, without the process of the Perform the intermediate hardening provided for in the main patent.
1000 g auf 6% Feuchtigkeit vorgetrocknete Holzspäne werden mit 60 g einer 5o°/oigen Lösung eines niedermolekularen Kondensationsproduktes aus 1,4-Butandioldiurethan und Formaldehyd durch möglichst feine Zerstäubung benetzt und nach guter Durchmischung in bekannter Weise mit 250 g einer 50°/oigen wäßrigen Lösung eines Harnstoffharzes, wie es üblicherweise zur Herstellung von Spanplatten verwendet wird, bedüst. Die so vor-1000 g of wood chips pre-dried to 6% moisture are mixed with 60 g of a 50% solution of a low molecular weight condensation product of 1,4-butanediol diurethane and formaldehyde wetted by atomization as fine as possible and after thorough mixing in a known manner with 250 g a 50% aqueous solution of a urea resin, as it is usually used for the production of Chipboard is used. The so pre-
709 875/43709 875/43
behandelten Späne werden bei 1300 zu Spanplatten verpreßt. Die Prüfung der erhaltenen Spanplatten ergibt nach vollständiger Aushärtung der Harze eine Zunahme der Dicke der Platten um 12 0Zo infolge Quellung nach 24stündiger Lagerung unter Wasser bei 200.treated chips are pressed at 130 0 to chipboard. The test of the chipboard obtained shows, after the resins have fully cured, an increase in the thickness of the boards by 12 0 Zo owing to swelling after storage under water at 20 0 for 24 hours.
Eine auf gleiche Weise, jedoch ohne die Vorbehandlung mit dem niedermolekularen Kondensationsprodukt von 1,4-Butandiol diurethan und Formaldehyd hergestellte Spanplatte ergibt bei der gleichen Wasserlagerungsprüfung eine Zunahme der Dicke um 25%. Die Wichte der Platten beträgt in beiden Fällen 0,65.One in the same way, but without the pretreatment with the low molecular weight condensation product Particle board produced from 1,4-butanediol diurethane and formaldehyde results in the same water immersion test shows an increase in thickness of 25%. The weight of the plates is in both cases 0.65.
In gleicher Weise, wie vorstehend für Spanplatten beschrieben, kann man auch Sperrholz herstellen. Plywood can also be produced in the same way as described above for chipboard.
An ,Stelle des Kondensationsproduktes aus i,4-Butandioldiurethan und Formaldehyd kann man auch ein durch Erhitzen etwa äquivalenter Mengen 1,4-Butandiol mit Harnstoff bis zur Bildung von etwa 40 bis 70% Diurethan und Umsetzen der erhaltenen Schmelze mit Formaldehyd hergestelltes niedermolekulares Kondensationsprodukt verwenden. An Stelle von 1,4-Butandiol kann man in gleicher Weise auch 1,6-Hexandiol als Ausgangsstoff verwenden.Instead of the condensation product of i, 4-butanediol diurethane and formaldehyde, one can also a by heating approximately equivalent amounts of 1,4-butanediol with urea until the formation of about 40 to 70% diurethane and reacting the resulting melt with formaldehyde Use low molecular weight condensation product. Instead of 1,4-butanediol, one can use in Use 1,6-hexanediol as a starting material in the same way.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEB23545A DE968367C (en) | 1952-12-28 | 1952-12-28 | Process for the production of shaped bodies from shredded wood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEB23545A DE968367C (en) | 1952-12-28 | 1952-12-28 | Process for the production of shaped bodies from shredded wood |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE968367C true DE968367C (en) | 1958-02-06 |
Family
ID=6961211
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEB23545A Expired DE968367C (en) | 1952-12-28 | 1952-12-28 | Process for the production of shaped bodies from shredded wood |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE968367C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1157374B (en) * | 1958-03-05 | 1963-11-14 | H Saastamoinen Oy Fa | Method of making fire-resistant plywood |
-
1952
- 1952-12-28 DE DEB23545A patent/DE968367C/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1157374B (en) * | 1958-03-05 | 1963-11-14 | H Saastamoinen Oy Fa | Method of making fire-resistant plywood |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE2026093B2 (en) | Process for the production of compressed wood panels | |
| DE1008703B (en) | Process for sizing glass fibers | |
| DE3328020A1 (en) | WOOD CHIPBOARD AND ADHESIVE RESIN SYSTEM FOR THE PRODUCTION OF WOOD CHIPBOARDS | |
| DE968367C (en) | Process for the production of shaped bodies from shredded wood | |
| DE2444002A1 (en) | METHOD FOR MANUFACTURING CHIPBOARD | |
| DE539475C (en) | Process for the production of infusible synthetic masses | |
| DE3321928C2 (en) | ||
| DE968649C (en) | Process for the production of shaped bodies from shredded wood | |
| DE813771C (en) | Process for the production of molded bodies, in particular building boards | |
| EP0016327B1 (en) | Latent hardener for aminoplast resins, process for its preparation and aminoplast resins containing same | |
| DE1453411C3 (en) | Process for the production of hot-pressed moldings | |
| DE594619C (en) | Braking or friction bodies | |
| DE958868C (en) | Method of making a glass mat laminate | |
| DE713676C (en) | Process for the manufacture of hardened molded plastics | |
| DE807643C (en) | Process for the production of molded bodies, in particular building boards | |
| DE2014175C3 (en) | Process for the production of arylene phenol-formaldehyde polycondensates and molding material on the basis of the resins mentioned | |
| DE2448472A1 (en) | PROCESS FOR THE PREPARATION OF SOLUTIONS OF HARDABLE UREA-FORMALDEHYDE RESINS | |
| DE538323C (en) | Process for the production of elastic masses from condensation products | |
| DE1303355C2 (en) | METHOD AND DEVICE FOR MANUFACTURING CHIPBOARD | |
| DE920987C (en) | Manufacture of molded fibrous bodies containing binders | |
| DE932633C (en) | Process for the production of rubber-like plastics | |
| DE737520C (en) | Filler for plastics and synthetic resin compounds | |
| DE875268C (en) | Method of manufacturing layered pressed fabrics | |
| DE885160C (en) | Process for the production of composite and pressed bodies from lignin-containing materials, in particular wood | |
| DE2200909C3 (en) | Process for the production of the edges and lower plate of skis made of wood as well as other wood products |