1. OBJETIVOS: PRINCIPALES:
Obtener resina compuesta de ureaformaldehido.
SECUNDARIOS:
Obtener una resina lo más resistente y formada posibles.
Determinar un rendimiento a distintas concentración y proporciones de nuestros reactivos, y así buscar las mejores condiciones para la obtención de una buena y apreciable resina.
Aprender Aprender los aspectos aspectos teóricos teóricos y reacciones de polimerización por condensación.
intetizar resinas fle!ibles y semirrí"idas por medio de la polimerización por condensación.
2. INTRODUCCIÓN: #as resinas urea-formaldehido, son resinas obtenidas mediante la reacción entre la urea y el formaldehido, catalizada por ácidos $ue conduce en una primera fase a compuestos $ue son metilolureas y lue"o estos reacción por condensación con liberación de a"ua #as metilolureas, como los productos de condensación de bajo peso molecular, son solubles en a"ua, por lo $ue las disoluciones acuosas concentradas permiten $ue se puedan moldear fácilmente, incluso su
“UNIVERSIDAD NACIONAL DE TRUJILLO”
CRISTALIZACION DE 1-NITRONAFTALENO
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mezcla con partículas de madera permite la obtención de tableros de maderas a"lomeradas. #a urea-formaldehído %&'(, tambi)n conocido como urea-metanal, llamado así por su vía de síntesis y estructura "eneral com*n, es una resina o plástico termoestable, hecho a partir de urea y formaldehído se calienta en presencia de una base d)bil, tales como amoníaco o piridina. +stas resinas se utilizan en adhesivos, acabados, D' %tableros de densidad media( y objetos moldeados. or sus "rupos amino en su estructura $uímica, constituye una de las resinas denominadas com*nmente como aminoplásticas.
3. FUNDAMENTO TEORICO A continuación continuación se hará una breve resea resea de la síntesis síntesis de de la &rea'ormaldehido/
3.1.- Urea: 0ompuesto cristalino incoloro, de fórmula 0O %123(3, con un punto de fusión fusión de de 453,6 70, &rea, tambi)n conocida como carbamida, carbonildiamida o ácido arbamídico, es el nombre del ácido carbónico de la diamida. 0uya fórmula $uímica $uímica es es %123(30O. +s una sustancia nitro"enada producida por al"unos seres vivos como medio de eliminación del amoníaco, el cuál es altamente tó!ico para ellos. +n los animales animales se se halla en la san"re san"re,, orina, bilis y sudor. #a urea se presenta como un sólido cristalino y blanco de forma esf)rica o "ranular. +s una sustancia hi"roscópica, es decir, $ue tiene la capacidad de absorber a"ua a"ua de de la atm atmósfera ósfera y presenta un li"ero olor a amoníaco. 0omercialmente la urea se presenta en pellets, "ránulos, o bien disuelta, dependiendo de la aplicación. e encuentra abundantemente en la orina de los humanos y otros mamíferos mamíferos.. +n cantidades menores, está presente en la san"re, en el hí"ado, en la linfa y en los fluidos serosos, y tambi)n en los e!crementos de los y muchos otros animales inferiores. +s soluble
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con amoniaco. #as temperaturas de reacción están comprendidas entre 45; y 4<; =0, y las presiones en 6> y 35> atm. #a reacción tiene lu"ar a trav)s del carbonato amónico.
3.2.- Metana ! F!r"a#e$%#!: 0ompuesto de carbono, hidró"eno hidró"eno y y o!í"eno o!í"eno de de fórmula 202O o 023O. 'ue descubierto en 4:?6 por el $uímico alemán Au"ust 8ilhelm von 2ofmann. +s el más simple de los aldehídos. A temperatura temperatura normal normal es un "as "as de de un olor penetrante. uede ser comprimido hasta el estado lí$uido@ estado lí$uido@ su punto de ebullición es -34 70. u preparación industrial re$uiere calentar aire aire seco seco y vapor de alcohol metílico en presencia de un catalizador, como el cobre cobre o o la plata. 1o obstante se han desarrollado procesos procesos más más directos sintetizando metanal a partir de monó!ido de carbono e hidró"eno. +n uno de estos procesos, se pasa esta mezcla por un catalizador a una temperatura entre 3>> y 5>> 70, a una presión presión de de 4>,3 atmósferas. +l metanal puro es muy reactivo y se polimeriza fácilmente. #a formalina es el nombre comercial de una solución $ue contiene un >B de metanal y un ?>B de a"ua, o de a"ua y alcohol metílico. e utiliza como desinfectante, insecticida, fun"icida y desodorante. +l formaldehído se emplea en la industria industria $uímica $uímica en "randes proporciones para sintetizar compuestos or"ánicos, especialmente en la fabricación de resinas sint)ticas. +studios recientes han revelado su naturaleza cancer í"ena. í"ena.
3.3.- Man&'a(t&ra #e A#$e)*+! #e Urea- F!r"a#e$%#! +l formaldehído, a la cantidad y concentración re$uerida, es descar"ado en el reactor. &na cantidad pesada de urea es aadida al caldero de reacción y lue"o la mezcla es calentada al punto de ebullición, al tiempo tiempo $ue $ue el catalizador de he!amina es "radualmente aadido. #a reacción diri"ida a la formación de urea formaldehído es una reacción de condensación $ue envuelve el desdoblamiento del a"ua durante la reacción, y la eliminación de a"ua de la mezcla. +l caldero de reacción es usualmente un contenedor
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suministrada para su calentamiento y enfriamiento. #a válvula de descar"a podría ser adecuada para permitir una rápida descar"a de la car"a de la resina viscosa. #a cubierta podría encerrar completamente la válvula de descar"a abierta para prevenir la creación de una baja temperatura temperatura la la cual solidificaría la resina de alta polimerización, por consi"uiente la prevención del contenido de la caldera al finalizar la reacción. Despu)s $ue la reacción ha sido procesada por dos horas y media, la concentración $ueda ajustada para un ;>B de contenido sólido. +l acetato de polivinilo es aadido para mejorar la calidad calidad del del uso en el contrachapado. ara usos especiales, ?;B de adhesivo de resina de urea formaldehído puede ser producida con la misma facilidad
3.,.- Rea((*!ne) "e(an*)"!) +cuaciones y mecanismos utilizados en la síntesis de &rea-'ormol, Cesonancia-'ormol y a$uelita.
Re)*na Urea-'!r"a#e$%#!.
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MATERIA PRIMA :
UREA PROPIEDADES
MATERIA MATERIA PRIMA: PRI MA:
FORMALDE0IDO PROPIEDADES
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REACTIVOS (*#! (!r$%#r*(!: +l ácido clorhídrico, ácido muriático, espíritu de sal, ácido marino, ácido de sal o todavía ocasionalmente llamado, ácido hidroclórico %por su e!tracción a partir de sal marina en Am)rica(, a"ua fuerte o salfumán %en +spaa(, es una disolución acuosa del "as cloruro de hidró"eno %20l(. +s muy corrosivo y ácido. e emplea com*nmente como reactivo $uímico y se trata de un ácido fuerte $ue se disocia completamente en disolución acuosa. &na disolución concentrada de ácido clorhídrico tiene un p2 inferior a 4@ una disolución de 20l >,4 da un p2 de 4 %0on > m# es suficiente para matar a un ser humano, en un litro de a"ua. Al disminuir el p2 provoca la muerte de todo el microbioma "astrointestinal, además de la destrucción de los tejidos "astrointestinales(. A temperatura temperatura ambiente, ambiente, el cloruro cloruro de hidró"eno hidró"eno es un "as "as li"eramente amarillo, corrosivo, no inflamable, más pesado $ue el aire, de olor fuertemente irritante. 0uando se e!pone al aire, el cloruro de hidró"eno forma vapores corrosivos densos de color blanco. +l cloruro de hidró"eno puede ser liberado por volcanes.
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atraz +rlenmeyer de 3;> ml robeta de 4> m#. +mbudo de ?>7 Easo $uímico de 3;> m#@ 4;> ml #una de reloj Earilla de a"itación ipeta de 4> m#
E&*4!):
omba al vacío +stufa
Mater*ae) #e "eta:
alanza semianalitica. cocina el)ctrica
Mater*ae) #e 4a4e 4!r(eana:
apel filtro +mbudo uchner
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TECNICAS UTILI5ADAS. 'iltración a presión reducida. ecado. esada con balanza. edida de lí$uidos por probeta. 0onfeccionar filtros. ao maría
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Baan(e e)te&*!"7tr*(! #e a rea((*8n:
Urea: 1mol
PM: 60.06 g/mo
PM: !0.0!1 g/mo
ALIMENTACI Formaldehido: 2moles
Baan(e #e "a)a: &rea/
'ormaldehido/
m=1 mol∗60.06
g 3 densidad : 0.8153 0.8153 g / cm mol
m=60.06 g m=2 moles∗30.031
v=
m 60.06 60.06 2 g = ρ g 0.8153
cm
3
g 60.062 g =60.062 mol
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3;11;21,
3;11;21,
1;11;21,
1;11;21,
< Se rea*98 a "&e)tra N=1
F e realizó la muestra 173
F e realizó la muestra 175
F e realizó la muestra 17
CARACTERISTICAS DE MUESTRA:
CARACTERISTICAS DE MUESTRA:
CARACTERISTICAS DE MUESTRA:
CARACTERISTICAS DE MUESTRA:
.- S!&(*8n #e 1n*tr!na'taen! #e &n (!n(entra(*8n #e 3>.? @.
.- olución de 4nitronaftaleno de un concentración de ,2.?
.- olución de 4nitronaftaleno de un concentración de 3>.?
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@.
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.- +!&"en &t**9a#!: 3 "
.- volumen utilizado/ 3
.- volumen utilizado/ 3
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"
"
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.- m)todo/
.- m)todo/
.- m)todo/
(r*)ta*9a(*8n #*)!&(*8n
(r*)ta*9a(*8n )!&t! )!+ente
(r*)ta*9a(*8n )!&t! )!+ente
.- )!+ente: "etan! @
.- solvente/ "etan!
.- solvente/ a(!$!
.- solvente/ a(!$!
@
*)!4r!4%*(!.
*)!4r!4%*(!.
.- 4e)! #e (r*)tae): .1
.- peso de cristales/
.- peso de cristales/
.- peso de cristales/
.2,
.11
.3
.- t*e"4!: ?? "*n
.- tiempo/ , "*n
.- tiempo/ ,? "*n
.- tiempo/ 1? "*n
.- te"4erat&ra:
.- temperatura/
.- temperatura/ ?
.- temperatura/ ?
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< Se rea*98 a "&e)tra N=?
F e realizó la muestra 17?
F e realizó la muestra 176
F e realizó la muestra 17:
CARACTERISTICAS DE MUESTRA:
CARACTERISTICAS DE MUESTRA:
CARACTERISTICAS DE MUESTRA:
CARACTERISTICAS DE MUESTRA:
.- S!&(*8n #e 1n*tr!na'taen! #e &n (!n(entra(*8n #e 3>.? @.
.- olución de 4nitronaftaleno de un concentración de ,2.?
.- olución de 4nitronaftaleno de un concentración de 3>.?
.- olución de 4nitronaftaleno de un concentración de
@.
@.
??.3@.
.- +!&"en &t**9a#!: 3 "
.- volumen utilizado/ 3
.- volumen utilizado/ 3
.- volumen utilizado/ 3
"
"
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.- m)todo/
.- m)todo/
.- m)todo/
(r*)ta*9a(*8n #*)!&(*8n
(r*)ta*9a(*8n )!&t! )!+ente
(r*)ta*9a(*8n )!&t! )!+ente
.- )!+ente: "etan! @
.- solvente/ "etan!
.- solvente/ a(!$!
.- solvente/ a(!$!
@
*)!4r!4%*(!.
*)!4r!4%*(!.
.- 4e)! #e (r*)tae): .1
.- peso de cristales/
.- peso de cristales/
.- peso de cristales/
.2,
.11
.3
.- t*e"4!: ?? "*n
.- tiempo/ , "*n
.- tiempo/ ,? "*n
.- tiempo/ 1? "*n
.- te"4erat&ra: , =C
.- temperatura/
.- temperatura/ ?
.- temperatura/ ?
, =C
=C
=C
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CARACTERISTICAS DE MUESTRA:
CARACTERISTICAS DE MUESTRA:
CARACTERISTICAS DE MUESTRA:
CARACTERISTICAS DE MUESTRA:
.- S!&(*8n #e 1n*tr!na'taen! #e &n (!n(entra(*8n #e 3>.? @.
.- olución de 4nitronaftaleno de un concentración de ,2.?
.- olución de 4nitronaftaleno de un concentración de 3>.?
.- olución de 4nitronaftaleno de un concentración de
@.
@.
??.3@.
.- +!&"en &t**9a#!: 3 "
.- volumen utilizado/ 3
.- volumen utilizado/ 3
.- volumen utilizado/ 3
"
"
"
.- "7t!#!: (r*)ta*9a(*8n )!&t! )!+ente
.- m)todo/
.- m)todo/
.- m)todo/
(r*)ta*9a(*8n #*)!&(*8n
(r*)ta*9a(*8n )!&t! )!+ente
(r*)ta*9a(*8n )!&t! )!+ente
.- )!+ente: "etan! @
.- solvente/ "etan!
.- solvente/ a(!$!
.- solvente/ a(!$!
@
*)!4r!4%*(!.
*)!4r!4%*(!.
.- 4e)! #e (r*)tae): .1
.- peso de cristales/
.- peso de cristales/
.- peso de cristales/
.2,
.11
.3
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los reactivos(. +n cada prueba $ue realizaremos la alimentación la esco"eremos nosotros de acuerdo a la cantidad de reactivos $ue contemos.
Baan(e e)te&*!"7tr*(! #e a rea((*8n:
Urea: 0.019mol
PM: 60.06 g/mo
PM: !0.0!1 g/mo
ALIMENTACI Formaldehido: 0.038
Baan(e #e "a)a:
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3. +n nuestra nuestra primera primera muestra muestra hemos hemos ele"ido ele"ido una una alimentación alimentación de de >.>4< moles de urea $ue reaccionaran con >.>5: moles de formaldehido@ pero como el formaldehido es li$uido en su estado natural@ trabajaremos en función a su volumen $ue es i"ual a 4.5<<6 ml. 5. &na vez vez calculados calculados las cantidade cantidades s a utilizar utilizar procedemos procedemos a pesar pesar y medir medir respectivamente la urea y formaldehido %procurar $ue la medición sea la más precisa posible para obtener mejores rendimientos(.
. #ue"o procede procedemos mos a colocar colocar los 4.4 4.4 " de de urea en un vaso de precipitación precipitación de 3;> ml@ y le a"re"amos 4.5<<6 ml de formaldehido. rocedemos a a"itar la solución hasta lo"rar $ue la urea, $ue inicialmente esta en "ranitos, se disuelva. Genemos $ue tener en cuenta $ue el p2 se manten"a entre ;-6.
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?. &na vez vez disuelto disuelto toda la urea procedemos procedemos a a"re"ar a"re"ar unas "otitas de de 20l concentrado para lo"rar la formación de la resina más rápidamente. %notamos $ue al momento de a"re"ar el 20l la solución instantáneamente tiende a aumentar su temperatura hasta un apro!imando de 56 a > 70(. 6. Ay mismo mismo tenemos tenemos $ue tener tener listo nuestro e$uipo e$uipo de filtración filtración por "ravedad "ravedad debido a $ue la mayor parte del lí$uido tiende a convertirse en sólido. :. &na vez vez filtrada nuestra mescla@ procedem procedemos os a colocar colocar el papel papel filtro filtro en una luna de reloj y lo llevamos a la estufa para secarlo. <. #ue"o de de unos 4> 4> a 4; min retiramos la luna de de reloj y procedemos procedemos a pesar pesar nuestra resina urea-formaldehido. 4>. 0on el peso obtenido teóricamente $ue es 3.3:354: " y el peso real de 3.43 procedemos encontrar nuestro B de rendimiento/
rendiminento =
2.12 g
∗100
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M&e)tra N= 2: Pr!(e#*"*ent! e4er*"enta: 4. #o primero primero $ue $ue tenemos tenemos $ue hacer es es nuestro nuestro balance balance este$uiom)t este$uiom)trico rico para saber cuántos "ramos tanto de urea como de formaldehido utilizaremos +n cada prueba $ue realizaremos la alimentación la esco"eremos nosotros de acuerdo a la cantidad de reactivos $ue contemos.
Baan(e e)te&*!"7tr*(! #e a rea((*8n:
Urea: 0.12mol
PM: 60.06 g/mo
PM: !0.0!1 g/mo
ALIMENTACI Formaldehido: 0.2%
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E(&a(*8n a &t**9ar: rendiminento =
greales ∗100 gteoricos
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rendiminento =
13.50 g 14.41464
g
∗100
rendiminento = 93.655
P!)*Ge) err!re): +l principal error $ue nos hemos podido dar cuenta, es $ue a la hora $ue la mezcla está lle"ando a los <;70 tiende a burbujear, lo cual hace $ue
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utilizaremos +n cada prueba $ue realizaremos la alimentación la esco"eremos nosotros de acuerdo a la cantidad de reactivos $ue contemos.
Baan(e e)te&*!"7tr*(! #e a rea((*8n:
Urea: 0.01&mol
PM: 60.06
PM: !0.0!1
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3. +n esta esta tercera tercera muestra muestra reduciremos reduciremos nuestra alimentación@ alimentación@ hasta hasta lo"rar lo"rar encontrar las condiciones esenciales para obtener una resina de buena calidad y obtener el mejor rendimiento posible.
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6. &na vez vez disuelto disuelto toda la urea procedemos procedemos a a"re"ar a"re"ar unas "otitas de de 20l concentrado para lo"rar la formación de la resina más rápidamente.
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M&e)tra N= ,: Pr!(e#*"*ent! e4er*"enta:
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E(&a(*8n a &t**9ar: rendiminento
greales
∗100
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#o primero $ue tenemos $ue hacer es hacer nuestro balance este$uimetrico para saber cuántos "ramos tanto de urea como de formaldehido utilizaremos % el balance nos ayuda para hallar el porcentaje de cada uno de los reactivos(
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rendiminento =
greales ∗100 gteoricos
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