CS252749B1 - Means for binding formaldehyde free from agglomerated materials and processes for its production - Google Patents

Means for binding formaldehyde free from agglomerated materials and processes for its production Download PDF

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CS252749B1
CS252749B1 CS862249A CS224986A CS252749B1 CS 252749 B1 CS252749 B1 CS 252749B1 CS 862249 A CS862249 A CS 862249A CS 224986 A CS224986 A CS 224986A CS 252749 B1 CS252749 B1 CS 252749B1
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urea
formaldehyde
composition
production
agglomerated materials
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CS862249A
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Czech (cs)
Slovak (sk)
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CS224986A1 (en
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Alexander Hespodarik
Olga Kriskova
Juraj Kubin
Svetozar Katuscak
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Alexander Hespodarik
Olga Kriskova
Juraj Kubin
Svetozar Katuscak
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Publication of CS252749B1 publication Critical patent/CS252749B1/en

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  • Chemical And Physical Treatments For Wood And The Like (AREA)

Abstract

Prostriedok pozostáva z kondenzačného produktu monomérnych, oligomérnych alebo polymérnych glykolov a močoviny v molárnom pomere 1:1 až 1:4. Podstata sposobu výroby prostriedku spočívá v tom, že glykoly s močovinou sa zlúčia pri pH 3 až 7, teplote 20 až 90 °C po dobu 240 minút.The composition consists of a condensation product of monomeric, oligomeric or polymeric glycols and urea in a molar ratio of 1:1 to 1:4. The essence of the method of producing the composition is that glycols and urea are combined at a pH of 3 to 7, a temperature of 20 to 90 °C for 240 minutes.

Description

(54) Prostriedok na viazanie formaldehydu uvofňujúceho sa z aglomerovaných materiálov a sposob jeho výroby(54) Means for binding formaldehyde released from agglomerated materials and methods for its production

22

Prostriedok pozostáva z kondenzačného produktu monomérnych, oligomérnych alebo polymérnych glykolov a močoviny v molárnom pomere 1:1 až 1:4. Podstata sposobu výroby prostriedku spočívá v tom, že glykoly s močovinou sa zlúčia pri pH 3 až 7, teplote 20 až 90 °C po dobu 240 minút.The composition consists of a condensation product of monomeric, oligomeric or polymeric glycols and urea in a molar ratio of 1: 1 to 1: 4. The essence of the process for the preparation of the composition is that the urea glycols are combined at pH 3-7 at 20-90 ° C for 240 minutes.

Vynález rieši prostriedok na viazanie formaldehydu uvolňujúceho sa z aglomerovaných materiálov a spósob jeho výroby.The present invention provides a means for binding formaldehyde released from agglomerated materials and a process for producing the same.

Aglomerované materiály na báze dřeva ako drevotrieskové, pilinové, pazderové a iné došky sa s výhodou vyrábajú za použitia močovino-formaldehydových lepidiel. Použitie lepidiel na tejto báze má za následok uvoíňovanie zdraviu škodlivého formaldehydu počias výroby, ďalšieho spracovania i užívania dosák, čo je dané chemickou podstatou používaných močovino-formaldehydových lepidiel. Za účelom zníženia úniku formaldehydu z aglomerovaných materiálov lepených močovino-formaldehydovými lepidlami boli zavedené rózne modifikácie popísaných lepidiel. Úpravy lepidiel sú buď viazané na použitie pre tieto účely ťažko dostupných látok ako je melamín a rezorcín, alebo riešía problém iba čiastočne, modifikáciou přípravkami na báze močoviny, například AO CSSR č. 179 159 sa týká prostriedku na viazanie formaldehydu v močovino-formaldehydových lepidlách a spósobu jeho výroby, AO ČSSR č. 179 158 rieši trieskovú došku a spósob jej výroby, AO CSSR č. 167 432 popisuje spósob výroby aglomerovanýcih dosáik a AO ČSSR 234 437 rieši hygienicky nezávadné aglomerované došky a spósob ich výroby. Iným postupom na zníženie úniku formaldehydu z aglomerovaných materiálov je ich dodatečná úprava, pri ktorej sa vyhotovené došky ošetria látkou reagujúcou s formaldehydom. K tomuto účelu sa používá amoniak a jeho soli, například AO ČSSR 248 973, ktorá rieši prípravok redukujúci únik formaldehydu. Popísanú dodatočnú úpravu dosák riešía aj patenty NSR DOS 2 903 524 a DOS 2 804 514. Uvedené zásahy do technologie výroby aglomerovaných dosák sice znižujú intenzitu úniku formaldehydu z nich, nezaručujú však zábranu proti dodatečnému úniku formaldehydu, ktorý sa tvoří v dósledku hydrolýzy močovino-formaldehydových lepidiel. Prostriedky doteraz používané na dodatočné ošetrenie dosák nemajú dostatočnú schopnosť reagovat s formaldehydom za rovnovážnej vlhkosti dosák, pri ktorej sa dalej spracovávajú a používajú ako výrobky.Agglomerated wood-based materials such as chipboard, sawdust, shovel and other thatch are preferably produced using urea-formaldehyde adhesives. The use of adhesives on this basis results in the release of harmful formaldehyde during the manufacture, further processing and use of the boards, which is due to the chemical nature of the urea-formaldehyde adhesives used. In order to reduce the leakage of formaldehyde from agglomerated materials bonded with urea-formaldehyde adhesives, various modifications of the described adhesives have been introduced. Adhesive treatments are either bound to use for these purposes hardly available substances such as melamine and resorcinol, or only partially solve the problem by modification with urea-based formulations such as AO CSSR no. No. 179,159 relates to a composition for binding formaldehyde in urea-formaldehyde adhesives and to a process for its production, AO ČSSR no. 179 158 solves the thatch and method of its production, AO CSSR no. 167 432 describes a process for the production of agglomerated slabs and AO ČSSR 234 437 deals with hygienically harmless agglomerated thatch and a method of their production. Another method for reducing formaldehyde leakage from agglomerated materials is post-treatment by treating the finished thatch with a formaldehyde-reactive substance. For this purpose, ammonia and its salts are used, for example AO CSR 248 973, which solves a formaldehyde leakage reducing agent. The described additional treatment of the boards is also solved by the patents of German Patent DOS 2 903 524 and DOS 2 804 514. Although the above mentioned interventions in the production technology of agglomerated boards reduce the intensity of formaldehyde leakage, they do not prevent further leakage adhesives. The compositions hitherto used for post-treatment of slabs do not have sufficient ability to react with formaldehyde at equilibrium moisture of the slabs in which they are further processed and used as products.

Popísané nedostatky súčasného stavu odstraňuje prostriedok na viazanie formaldehydu uvolňujúceho sa z aglomerovaných materiálov podfa vynálezu, ktorého podstata spočívá v tom, že pozostáva z kondenzačného produktu monomérnych, aligomérnych aleibo polymérnych glykolov a močoviny v molárnom pomere 1:1 až 1:4. Podstata spósobu výroby spočívá v tom, že sa vo vodnom prostředí zlúčia monomérne, oligomérne alebo polymérne glykoly s močovinou v molárnom pomere 1:1 až 1: 4 pri pH 3 až 7, teplote 20 až 90 °C po dobu 20 až 240 minút.The described drawbacks of the present state of the art overcome the formaldehyde-binding agent released from the agglomerated materials of the invention, which consists of the condensation product of monomeric, alligomeric or polymeric glycols and urea in a molar ratio of 1: 1 to 1: 4. The essence of the process is to combine monomeric, oligomeric or polymeric glycols with urea in a molar ratio of 1: 1 to 1: 4 at a pH of 3 to 7 at 20 to 90 ° C for 20 to 240 minutes in an aqueous medium.

Vyšší účinok vynálezu sa prejavuje v tom, že prostriedok je dlhodobe aktívny a znižuje únik formaldehydu z drevotrieskových dosák až o 95 %. Prostriedok připravený spósobom podlá vynálezu aktivně reaguje s formaldehydom vo formě vodného roztoku a v stave vzduchosuchom. Výhody spósobu výroby prostriedku sú v tom, že je ho možné připravil jednoduchou technológiou z dostupných surovin.The greater effect of the invention is manifested in the fact that the composition is long-term active and reduces the leakage of formaldehyde from particle board by up to 95%. The composition prepared by the process of the invention actively reacts with formaldehyde in the form of an aqueous solution and in the air-dry state. The advantages of the method of making the composition are that it can be prepared by simple technology from available raw materials.

Příklad 1 hmot. dielov monoetylénglykolu, 880 hmot. dielov vody a 60 hmot. dielov močoviny sa zmieša v uvedenom poradí, pH sa upraví na 7 a za stálého miešania pri teplote 20 °C sa kondenzuje 60 minút. Takto připravený prostriedok obsahuje 10 % hmot. sušiny. V stávajúcej formě je stabilný a bez ďalšej úpravy použitelný na elimináciu dodatečného uvolňovania formaldehydu z aglomerovaných materiálov.Example 1 wt. parts by weight of monoethylene glycol, 880 wt. parts of water and 60 wt. parts of urea are mixed in that order, the pH is adjusted to 7 and condensed for 60 minutes with stirring at 20 ° C. The composition thus prepared contains 10 wt. solids. In its present form it is stable and usable without further treatment to eliminate the additional release of formaldehyde from the agglomerated materials.

Příklad 2 hmot. dielov monoetylénglykolu, 320 hmot. dielov vody a 120 hmot. dielov močoviny sa zmieša v uvedenom poradí, pH sa upraví na 5 a za stálého miešania pri teplote 50 °C sa kondenzuje po dobu 120 minút. Po skončení reakcie sa prostriedok ochladí na 20 až 25 °C. Takto připravený prostriedok má obsah sušiny 29 % hmot. a je použitelný ako v příklade 1.Example 2 wt. parts by weight of monoethylene glycol, 320 wt. parts of water and 120 wt. parts of urea are mixed in that order, the pH is adjusted to 5 and condensed for 120 minutes with stirring at 50 ° C. After completion of the reaction, the composition is cooled to 20-25 ° C. The composition thus prepared has a dry matter content of 29% by weight. and is applicable as in Example 1.

Příklad 3Example 3

106 hmot. dielov dietylénglykolu, 800 hmot. dielov vody a 120 hmot. dielov močoviny sa zmieša v uvedenom poradí, pH sa upraví na 3 a za stálého miešania pri teplote 30 °C sa kondenzuje po dobu 90 minút. Po ukončení reakcie sa prostriedok ochladí na teplotu 20 až 25 °C. Takto připravený prostriedok obsahuje 18,7 % hmot. sušiny a je použitelný ako v příklade 1.106 wt. parts by weight of diethylene glycol, 800 wt. parts of water and 120 wt. parts of urea are mixed in that order, the pH is adjusted to 3 and condensed for 90 minutes with stirring at 30 ° C. After completion of the reaction, the composition was cooled to 20-25 ° C. The composition thus prepared contains 18.7 wt. and is applicable as in Example 1.

Příklad 4Example 4

106 hmot. dielov dietylénglykolu, 350 hmot. dielov vody a 240 hmot. dielov močoviny sa zmieša v uvedenom poradí, pH sa upraví na 6 a za stálého miešania pri teplote 60 °C sa kondenzuje po dobu 180 minút. Po skončení reakcie sa prostriedok ochladí na 20 až 25 °C. Takto připravený prostriedok má obsah sušiny 39,2 % hmot. a je použitelný ako' v příklade 1.106 wt. parts by weight of diethylene glycol, 350 wt. parts of water and 240 wt. parts of urea are mixed in that order, the pH is adjusted to 6 and condensed for 180 minutes with stirring at 60 ° C. After completion of the reaction, the composition is cooled to 20-25 ° C. The composition thus prepared has a dry matter content of 39.2% by weight. and is usable as in Example 1.

Příklad 5Example 5

300 hmot. dielov polyetylénglykolu o molekulovej hmotnosti 1 000, 3 100 hmot. dielov vody a 72 hmot. dielov močoviny zmiešame v uvedenom poradí, pH sa upraví na 6 a za stálého1 miešania pri teplote 50 °C sa kondenzuje po dobu 120 minút. Po ukončení reak252749 cie sa prostriedok ochladí na 20 až 25 °C. Takto připravený prostriedok obsahuje 10 % hmot. sušiny a je použitelný ako v příklade 1.300 wt. parts by weight of polyethylene glycol having a molecular weight of 1,000, 3,100 wt. parts of water and 72 wt. We mix the components urea, respectively, adjusted to pH 6, and 1 with continued stirring at 50 ° C was condensed for 120 minutes. After completion of the reaction, the composition is cooled to 20-25 ° C. The composition thus prepared contains 10 wt. and is applicable as in Example 1.

Prostriedok na viazanie formaldehydu a sposob jeho výroby podfa vynálezu je použitelných v drevárskom a nábytkárskom priemysle na elimináciu dodatečného uvofňovania formaldehydu z aglomerovaných materiálov.The formaldehyde binder and process for its preparation according to the invention are useful in the wood and furniture industry to eliminate the additional release of formaldehyde from agglomerated materials.

Claims (3)

PREDMETSUBJECT Prostriedok na viazanie formaldehydu uvofňujúceho sa z aglomerovaných materiálov, najma na báze dřeva, vyznačujúci sa tým, že pozostáva z kondenzačného produktu monomérnych, oligomérnych alebo polymérnych glykolov a močoviny v molárnom pomere 1 : 1 až 1 : 4.A composition for binding formaldehyde released from agglomerated materials, in particular wood based, characterized in that it consists of a condensation product of monomeric, oligomeric or polymeric glycols and urea in a molar ratio of 1: 1 to 1: 4. YNÁLEZUINVENTION It 2. Sposob výroby prostriedku podfa bodu 1, vyznačujúci sa tým, že sa vo vodnom prostředí zlúčia monomérne, oligomérne alebo polymérne glykoly s močovinou v molárnom pomere 1:1 až 1:4 pri pH.2. A process for the preparation of the composition according to claim 1, characterized in that monomeric, oligomeric or polymeric glycols are combined in the aqueous medium with urea in a molar ratio of 1: 1 to 1: 4 at pH. 3 až 7, teplote 20 až 90 °C po dobu 20 až 240 minút.3 to 7, 20 to 90 ° C for 20 to 240 minutes.
CS862249A 1986-04-01 1986-04-01 Means for binding formaldehyde free from agglomerated materials and processes for its production CS252749B1 (en)

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