{"id":142955,"date":"2022-12-16T12:30:20","date_gmt":"2022-12-16T10:30:20","guid":{"rendered":"https:\/\/concentrol.com\/mould-release-agents-for-cold-curing-polyurethane-foam\/"},"modified":"2022-12-16T12:33:42","modified_gmt":"2022-12-16T10:33:42","slug":"desemmotllants-per-a-escuma-de-poliureta-de-curat-en-fred","status":"publish","type":"post","link":"https:\/\/hosting175685eu-cp704.wordpresstemporal.com\/ca\/desemmotllants-per-a-escuma-de-poliureta-de-curat-en-fred\/","title":{"rendered":"Desemmotllants per a escuma de poliuret\u00e0 de curat en fred"},"content":{"rendered":"

[vc_row][vc_column][vc_column_text uncode_shortcode_id=\u00bb178244″]El poliuret\u00e0 \u00e9s un material<\/span> pl\u00e0stic<\/b> que es caracteritza per estar format per cadenes polim\u00e8riques m\u00e9s o menys entrecreuades, donant materials des de molt tous fins a completament r\u00edgids.<\/span><\/p>\n

Est\u00e0 compost per una fam\u00edlia de pol\u00edmers molt vers\u00e0til, ja que tenen m\u00faltiples aplicacions molt diferents entre si, per exemple, en pintures, fibres, adhesius reactius en base aigua, <\/span>solvent o solvent-less,<\/span><\/i> escumes modelades o en continu, t\u00e8xtil, dispersions aquoses per a m\u00faltiples aplicacions, etc.<\/span><\/p>\n

Aquests pol\u00edmers es formen a partir de reaccions exot\u00e8rmiques de polimeritzaci\u00f3 dels dos components principals: l’Isocianat i el Poliol.<\/span><\/p>\n

Per regla general, els materials reactius (poliol i isocianat) s’introdueixen al motlle a trav\u00e9s d’una bugada o injecci\u00f3 premesclada a alta o baixa pressi\u00f3, formant en pocs minuts la pe\u00e7a que, despr\u00e9s de ser desemmotllada, deixa el motlle lliure per repetir de nou tot el proc\u00e9s. La pe\u00e7a resultant reprodueix tots els detalls del motlle, ja que l’escuma de poliuret\u00e0 s’expandeix i omple tot l’espai buit del motlle, obtenint aix\u00ed la forma desitjada de la pe\u00e7a.<\/span><\/p>\n

 <\/p>\n

Escuma flexible de poliuret\u00e0 de curat en fred<\/b><\/p>\n

Amb aquest proc\u00e9s productiu es produeixen escumes per a seients, respatllers, i reposacaps per a autom\u00f2bils i altres mitjans de transport com avions, autobusos o trens. Tamb\u00e9 es poden fer peces per a mobiliari i per al sector del descans.<\/span><\/p>\n

Aquest tipus de producci\u00f3 cada cop \u00e9s el m\u00e9s escollit pels fabricants, perqu\u00e8 <\/span>no requereix tant consum energ\u00e8tic <\/b>com el curat en calent.<\/span><\/p>\n

Els motlles d’aquesta escuma flexible poden ser des d’alumini fins a fusta passant per acer inoxidable o resina epoxi. En instal\u00b7lacions d’emmotllament d’escuma per a sectors importants, com automoci\u00f3 o mobiliari, solen tenir els motlles d’acer o alumini, mentre que a pa\u00efsos o sectors amb escassa tecnologia o amb nivells d’acceptaci\u00f3 i qualitat m\u00e9s relaxats, es poden fer servir materials com la resina epoxi o la fusta.<\/span><\/p>\n

El motlle \u00e9s un factor determinant posat cadascun t\u00e9 un <\/span>desemmotllant<\/b> adequat; a la producci\u00f3 d’escuma flexible desemmotllada amb producte base aigua o h\u00edbrid, si entra en contacte amb superf\u00edcies f\u00e8rriques, apareixeran signes d’oxidaci\u00f3 a curt o mitj\u00e0 termini.<\/span><\/p>\n

El tipus d’instal\u00b7lacions de l’escuma flexible de curat en fred pot ser molt variada, com ara carrusels en moviment o motlles fixos, amb barreja de components a alta o baixa pressi\u00f3. El tipus d’injecci\u00f3 implica, en el cas de l’alta pressi\u00f3, una entrada dels components barrejats m\u00e9s r\u00e0pidament i molt poc perfeccionats, m\u00e9s lentament i m\u00e9s perfeccionats en baixa pressi\u00f3. La bugada a alta pressi\u00f3 interactua amb el <\/span>desemmotllant <\/b>molt m\u00e9s que la barrejada a baixa pressi\u00f3.<\/span><\/p>\n

Cal destacar que la baixa pressi\u00f3 est\u00e0 desapareixent, ja que genera residu de dissolvent de neteja en procedir a l’eliminaci\u00f3 de restes de poliuret\u00e0 despr\u00e9s de cada bugada. En alta pressi\u00f3, l’operaci\u00f3 \u00e9s autonetejant sense necessitat de dissolvent.<\/span><\/p>\n

Esmentar tamb\u00e9 l’\u201cescuma viscoel\u00e0stica\u201d, molt coneguda a la ind\u00fastria del descans, si b\u00e9 t\u00e9 aplicacions en peces per a autom\u00f2bil. Es tracta d’escuma flexible de curat en fred la principal caracter\u00edstica del qual \u00e9s la seva adaptaci\u00f3 al cos, facilitant el descans als matalassos fabricats amb aquest material.<\/span><\/p>\n

S’anomena tamb\u00e9 \u201cmemory foam\u201cdoncs sempre recupera, de manera pausada, la seva forma original. Els desemmotlladors per a aquest tipus d’escuma han de compensar l’efecte tipus \u201cventosa\u201d que s’origina en ser una escuma de porus tancat i de capacitat d\u2019enganxat en la seva superf\u00edcie. Se sol treballar en un ampli marge de temperatura, depenent del client i la seva formulaci\u00f3, entre ambient i 65 \u00b0C.<\/span><\/p>\n

\u00a0<\/span><\/p>\n

Tractaments posteriors al desemmotllament i propietats superficials necess\u00e0ries segons dest\u00ed de la pe\u00e7a<\/b><\/p>\n

En moltes de les peces es requereix tacte antisoroll, per evitar el so que es produeix entre l’escuma i la carcassa met\u00e0l\u00b7lica en asseure’ns o moure’ns sobre el seient.<\/span><\/p>\n

Habitualment se soluciona aplicant a posteriori, despr\u00e9s del desemmotllament, un producte d’acabat gras i color blau, per veure si on s’ha pintat, a la superf\u00edcie on resideix el problema de soroll (hi ha solucions de productes que es detecten per UV i no necessiten el color blau).<\/span><\/p>\n

Dins aquests productes antisoroll hi ha formulacions de diferents caracter\u00edstiques per cobrir totes les necessitats de mercat i normatives existents. El que ha de fer el desemmotllant, \u00e9s facilitar l’enfonsament de les peces aportant, en la mesura del possible, un tacte suau i lliscant. Actualment, s’aconsegueix a base de porus petit i uniforme, i amb l’ajuda d’algun lliscant superficial incorporat al mateix producte, si b\u00e9 no es pot donar un tacte molt suau pel fet que els productes per a aquest fi solen donar dubtes d’irregularitats o atacs superficials.<\/span><\/p>\n

Els seients dels cotxes actuals solen portar sensors de detecci\u00f3 de pres\u00e8ncia, per avisar de cordar-se el cintur\u00f3. Tamb\u00e9 en gammes m\u00e9s altes porten de s\u00e8rie napes calefactores per escalfar el seient en \u00e8poques fredes. Aix\u00f2 implica que la pe\u00e7a desemmotllada ha de permetre que a la seva superf\u00edcie s’enganxin perfectament els tractaments autoadhesius que porten les peces esmentades. El cas del sensor de pres\u00e8ncia \u00e9s particularment important, ja que es considera un element de seguretat i ha de quedar perfectament adherit.<\/span><\/p>\n

Els desemmotllants s\u00f3n productes que intervenen en gran manera en el proc\u00e9s productiu de les peces d’escuma de poliuret\u00e0. Per aix\u00f2, Concentrol investiga constantment noves propietats i formulacions que s’adaptin a les noves necessitats de la ind\u00fastria. La reducci\u00f3 del VOC, l’eliminaci\u00f3 del <\/span>descrostat<\/span><\/i> o el desenvolupament de productes a base d’aigua per a tota mena d’aplicacions s\u00f3n un repte constant per a l’equip t\u00e8cnic de la nostra empresa qu\u00edmica.<\/span>[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column width=\u00bb1\/1″][vc_button border_width=\u00bb0″ link=\u00bburl:https%3A%2F%2Fconcentrol.com%2Fwp-content%2Fuploads%2F2022%2F12%2FCAT_espuma-pu-curat-fred_compressed.pdf|target:_blank\u00bb uncode_shortcode_id=\u00bb490600″]Descarregar infografia[\/vc_button][vc_column_text uncode_shortcode_id=\u00bb134518″]

CAT_espuma-pu-curat-fred_compressed<\/a><\/div>[\/vc_column_text][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

[vc_row][vc_column][vc_column_text uncode_shortcode_id=\u00bb178244″]El poliuret\u00e0 \u00e9s un material pl\u00e0stic que es caracteritza per estar format per cadenes polim\u00e8riques m\u00e9s o menys entrecreuades, […]<\/p>\n","protected":false},"author":24,"featured_media":142927,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"categories":[127],"tags":[922,923],"class_list":["post-142955","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-desemmotllantsrb","tag-cardboard-ca","tag-paper-ca"],"acf":[],"yoast_head":"\nDesemmotllants per a escuma de poliuret\u00e0 de curat en fred<\/title>\n<meta name=\"description\" content=\"Concentrol - Chemical Solutions\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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