{"id":6974,"date":"2024-05-27T01:11:56","date_gmt":"2024-05-27T01:11:56","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=6974"},"modified":"2026-04-28T10:42:29","modified_gmt":"2026-04-28T10:42:29","slug":"what-are-the-specific-applications-of-polyurethane-catalysts-in-several-typical-polyurethane-flexible-foams","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/fr\/what-are-the-specific-applications-of-polyurethane-catalysts-in-several-typical-polyurethane-flexible-foams\/","title":{"rendered":"Quelles sont les applications sp\u00e9cifiques des catalyseurs de polyur\u00e9thane dans plusieurs mousses souples de polyur\u00e9thane typiques ?"},"content":{"rendered":"<p><!-- lc-qa-start --><\/p>\n<p><strong>Quick answer:<\/strong> A practical additive decision starts with the exact defect: foam, poor wetting, craters, haze, or instability. The best product is usually the one that solves that defect with the safest compatibility window.<\/p>\n<p><!-- lc-qa-end --><\/p>\n<p>1\u3001Typique de la formule et de la performance de la mousse souple de PU de type poly\u00e9ther en bloc<\/p>\n<p>Alcool ternaire poly\u00e9ther 100pbw<\/p>\n<p>TDI80\/20 46,0pbw<\/p>\n<p>Catalyseur organique \u00e0 l'\u00e9tain 0,4pbw<\/p>\n<p>Catalyseur d'amine tertiaire 0,2pbw<\/p>\n<p>Stabilisateur de mousse organosilici\u00e9 1,0pbw<\/p>\n<p>Eau 3.6pbw<\/p>\n<p>Agent moussant auxiliaire 0~12pbw<\/p>\n<p>&nbsp;<\/p>\n<p>Performance :<\/p>\n<p>Densit\u00e9 de la mousse, kg\/m3 22,4<\/p>\n<p>R\u00e9sistance \u00e0 la traction, kpa 96,3<\/p>\n<p>Allongement, % 220<\/p>\n<p>R\u00e9sistance \u00e0 la d\u00e9chirure, N\/m 385<\/p>\n<p>Kit de compression, 50% 6<\/p>\n<p>90% 6<\/p>\n<p>Charge de la cavit\u00e9, kg<\/p>\n<p>(38cm\u00d735.6cm\u00d710cm)<\/p>\n<p>D\u00e9formation 25% 13,6<\/p>\n<p>65% 25.6<\/p>\n<p>Rebond de la balle, % 38<\/p>\n<p>&nbsp;<\/p>\n<p>Ces derni\u00e8res ann\u00e9es, afin de r\u00e9pondre aux besoins du march\u00e9, certaines entreprises ont tendance \u00e0 produire des mousses de faible densit\u00e9 (10kg\/m3 ou moins). Pour produire des mousses souples de tr\u00e8s faible densit\u00e9, il ne suffit pas d'augmenter l'agent gonflant et l'agent gonflant auxiliaire, mais il faut \u00e9galement que les agents tensioactifs et les catalyseurs \u00e0 base de silicone aient une stabilit\u00e9 relativement \u00e9lev\u00e9e pour pouvoir coop\u00e9rer.<\/p>\n<p>&nbsp;<\/p>\n<p>Production de mousse souple de tr\u00e8s faible densit\u00e9 formule de r\u00e9f\u00e9rence :<\/p>\n<p>&nbsp;<\/p>\n<p>Nom Densit\u00e9 moyenne Faible densit\u00e9 Densit\u00e9 ultra-faible<br \/>\nBo\u00eete continue bo\u00eete continue bo\u00eete bo\u00eete bo\u00eete bo\u00eete bo\u00eete<br \/>\nPolyol de poly\u00e9ther 100 100 100 100 100 100<br \/>\nEau 3,0 3,0 4,5 5,5 6,6<br \/>\nCatalyseur A-33 0,2 0,2 0,2 0,2 0,25 0,18<br \/>\nTensioactif \u00e0 base de silicium B-8110 1,0 1,2 1,1 1,9 3,8<br \/>\nOctoate de stanne 0,25 0,28 0,35 0,36 0,40<br \/>\nAide-mousse 7,5 7,5 12,5 15,0 34,0<br \/>\nTDI80\/20 41,4 44,0 56,0 73,0 103,0<br \/>\nDensit\u00e9, kg\/m3 23,0 23,0 16,5 14,0 8,0<\/p>\n<p>Formule de mousse cylindrique :<\/p>\n<p>Poly\u00e9ther polyol de type EO\/PO (OH:56) 100pbw<\/p>\n<p>Eau 6.43pbw<\/p>\n<p>Agent gonflant MC 52,5pbw<\/p>\n<p>Tensioactif \u00e0 base de silicium L-628 6,50pbw<\/p>\n<p>Catalyseur A230 0,44pbw<\/p>\n<p>Octoate de stanne D19 0,85pbw<\/p>\n<p>Indice TDI80\/20 0,99<\/p>\n<p>Dosage 139pbw<\/p>\n<p>Densit\u00e9 de la mousse, kg\/m3 7,5<\/p>\n<p>&nbsp;<\/p>\n<p>2\u3001L'agent gonflant auxiliaire CO2 liquide pour la fabrication de mousse \u00e0 faible densit\u00e9<\/p>\n<p>Alcool ternaire poly\u00e9ther (Mn3000) 100 100<\/p>\n<p>Eau 4,9 5,2<\/p>\n<p>CO2 liquide 2,5 3,3<\/p>\n<p>Tensioactif \u00e0 base de silicium L631 1,5 1,75<\/p>\n<p>B8404<\/p>\n<p>Catalyseur aux amines A133 0,28 0,30<\/p>\n<p>Octoate de stanne 0,14 0,17<\/p>\n<p>Retardateur de flammes DE60F 0 14<\/p>\n<p>Indice TDI80\/20 110 112<\/p>\n<p>Densit\u00e9 de la mousse, kg\/m3 16 16<\/p>\n<p>&nbsp;<\/p>\n<p>Les formulations typiques de cheveux en machine sont les suivantes :<\/p>\n<p>Alcool ternaire poly\u00e9ther (Mn3000) 100pbw<\/p>\n<p>Eau 4.0pbw<\/p>\n<p>LCO2 4,0~5,5pbw<\/p>\n<p>Catalyst A33 0,25pbw<\/p>\n<p>Tensioactif \u00e0 base de silicium SC155 1,35pbw<\/p>\n<p>Octoate de stanne D19 0,20pbw<\/p>\n<p>Indice TDI80\/20 110<\/p>\n<p>Densit\u00e9 de la mousse, kg\/m3 14,0~16,5<\/p>\n<p>&nbsp;<\/p>\n<p>3\u3001Mousse souple de polyur\u00e9thane basse densit\u00e9 MDI compl\u00e8te<\/p>\n<p>La mousse moul\u00e9e flexible en PU est largement utilis\u00e9e dans la production de coussins de si\u00e8ges de voiture. L'objectif du d\u00e9veloppement est de r\u00e9duire la densit\u00e9 sans affecter les propri\u00e9t\u00e9s physiques.<\/p>\n<p>Formulation :<\/p>\n<p>Poly\u00e9ther hautement actif (OH:26~30mgKOH\/g) 80pbw<\/p>\n<p>Polym\u00e8re polyol (OH:23~27mgKOH\/g) 20pbw<\/p>\n<p>Agent de r\u00e9ticulation 0~3pbw<\/p>\n<p>Eau 4.0pbw<\/p>\n<p>Catalyseur aux amines A-33 2,8pbw<\/p>\n<p>Tensioactif \u00e0 base d'huile de silicone B8716 1,0pbw<\/p>\n<p>Indice MDI 90pbw<\/p>\n<p>&nbsp;<\/p>\n<p>Performance :<\/p>\n<p>Densit\u00e9 centrale de la mousse 34,5kg\/m3<\/p>\n<p>Duret\u00e9 ILD25% 15.0kg\/314cm2<\/p>\n<p>R\u00e9sistance \u00e0 la d\u00e9chirure 0,8kg\/cm<\/p>\n<p>R\u00e9sistance \u00e0 la traction 1,34kg\/cm2<\/p>\n<p>\u00c9longation 120%<\/p>\n<p>R\u00e9silience 62<\/p>\n<p>Compression permanente (s\u00e8che) 5.0%<\/p>\n<p>(humide) 13,5<\/p>\n<p>&nbsp;<\/p>\n<p>4\u3001Coussins de si\u00e8ge de voiture \u00e0 faible densit\u00e9, enti\u00e8rement MDI, respectueux de l'environnement<\/p>\n<p>Adoption d'un homologue pur du MDI : M50 - c'est-\u00e0-dire 4,4'MDI 50% 2,4'MDI 50% du produit, peut \u00eatre moussant \u00e0 temp\u00e9rature ambiante, am\u00e9liorer la fluidit\u00e9, r\u00e9duire la densit\u00e9 du produit, r\u00e9duire le poids du v\u00e9hicule, est un produit tr\u00e8s prometteur :<\/p>\n<p>Formulation :<\/p>\n<p>Poly\u00e9ther polyol hautement actif (OH:28mgKOH\/g) 95pbw<\/p>\n<p>310 additifs* 5pbw<\/p>\n<p>Dabco 33LV 0,3pbw<\/p>\n<p>Dabco 8154 0,7pbw<\/p>\n<p>Tensioactif \u00e0 base de silicium B4113 0,6pbw<\/p>\n<p>A-1 0,1pbw<\/p>\n<p>Eau 3.5pbw<\/p>\n<p>M50 50pbw<\/p>\n<p>Indice d'isocyanate 88<\/p>\n<p>&nbsp;<\/p>\n<p>Propri\u00e9t\u00e9s physiques :<\/p>\n<p>Dur\u00e9e du tirage au sort 62<\/p>\n<p>Temps de mont\u00e9e (s) 98<\/p>\n<p>Densit\u00e9 de la bulle libre, kg\/m3 32,7<\/p>\n<p>D\u00e9viation de la charge de compression, kpa:40% 1.5<\/p>\n<p>Allongement, % 180<\/p>\n<p>R\u00e9sistance \u00e0 la d\u00e9chirure, N\/m 220<\/p>\n<p>Note : *310 additifs : nous avons vendu un agent de croissance sp\u00e9cial pour les cha\u00eenes.<\/p>\n<p>&nbsp;<\/p>\n<p>5\u3001Mousse PU haute r\u00e9silience, confort de conduite<\/p>\n<p>R\u00e9cemment, les propri\u00e9t\u00e9s physiques des coussins de si\u00e8ge en mousse sont rest\u00e9es inchang\u00e9es, mais les gens sont assis dans la voiture pendant une longue p\u00e9riode sans fatigue, pas de mal des transports, coussin de si\u00e8ge de haute qualit\u00e9. Apr\u00e8s des recherches, les organes internes du corps humain, en particulier l'estomac et d'autres organes dans la fr\u00e9quence d'environ 6Hz, si elle est caus\u00e9e par la r\u00e9sonance, provoquera la r\u00e9gurgitation, le vomissement et d'autres ph\u00e9nom\u00e8nes.<\/p>\n<p>En g\u00e9n\u00e9ral, la transmissibilit\u00e9 des vibrations de la mousse \u00e0 haute r\u00e9silience \u00e0 6 Hz est de 1,1~1,3, c'est-\u00e0-dire que lorsque le v\u00e9hicule roule, non seulement elle ne s'affaiblit pas, mais elle augmente, et certains produits formul\u00e9s peuvent amortir les vibrations jusqu'\u00e0 0,8~0,9. Nous recommandons maintenant une formule de produit dont la transmissibilit\u00e9 des vibrations \u00e0 6 Hz est de 0,5~0,55.<\/p>\n<p>Formulation :<\/p>\n<p>Polyol de poly\u00e9ther hautement actif (Mn6000) 100pbw<\/p>\n<p>Tensioactif \u00e0 base de silicium, SRX-274C 1,0pbw<\/p>\n<p>Catalyseur d'amine tertiaire, Minico L-1020 0,4pbw<\/p>\n<p>Catalyseur d'amine tertiaire, Minico TMDA 0,15pbw<\/p>\n<p>Eau 3.6pbw<\/p>\n<p>Isocyanate pr\u00e9polym\u00e8re (NCO%=29,7%)<\/p>\n<p>INDEX 100<\/p>\n<p>Propri\u00e9t\u00e9s physiques :<\/p>\n<p>Densit\u00e9 totale, kg\/m3 48,0<\/p>\n<p>25%ILD, kg\/314cm2 19,9<\/p>\n<p>R\u00e9silience, % 74<\/p>\n<p>50% r\u00e9sistance \u00e0 la compression (s\u00e8che) 1,9<\/p>\n<p>(humide) 2,5<\/p>\n<p>Transmission des vibrations \u00e0 6 Hz 0,55<\/p>\n<p>&nbsp;<\/p>\n<p>6\u3001Mousse visco\u00e9lastique ou \u00e0 faible rebond<\/p>\n<p>La mousse de PU dite \u00e0 rebond lent fait r\u00e9f\u00e9rence \u00e0 la d\u00e9formation de la mousse par des forces ext\u00e9rieures, la mousse ne reprend pas imm\u00e9diatement sa forme initiale, mais se r\u00e9tablit lentement, et il n'y a pas de d\u00e9formation r\u00e9siduelle de la surface de la mousse. Elle poss\u00e8de d'excellentes propri\u00e9t\u00e9s d'amortissement, d'insonorisation, d'\u00e9tanch\u00e9it\u00e9 et autres. Elle peut \u00eatre utilis\u00e9e dans la pr\u00e9vention du bruit des moteurs de voiture, dans les moquettes, dans les jouets pour enfants et dans les oreillers m\u00e9dicaux.<\/p>\n<p>Exemple de formule :<\/p>\n<p>Poly\u00e9ther hautement actif (OH34) 40~60pbw<\/p>\n<p>Polym\u00e8re poly\u00e9ther (OH28) 60~40 pbw<\/p>\n<p>Agent de liaison crois\u00e9e ZY-108* 80~100 pbw<\/p>\n<p>L-580 1,5 pbw<\/p>\n<p>Catalyseur 1,8~2,5 pbw<\/p>\n<p>Eau 1,6~2,2 pbw<\/p>\n<p>Indice d'isocyanate** 1,05 pbw<\/p>\n<p>Note : *ZY-108, compos\u00e9 de poly\u00e9ther multifonctionnel de faible poids mol\u00e9culaire<\/p>\n<p>**PM-200 et MDI-100 liqu\u00e9fi\u00e9 sont des produits Wanhua.<\/p>\n<p>Propri\u00e9t\u00e9s physiques :<\/p>\n<p>Densit\u00e9 de la mousse, kg\/m3 150~165<\/p>\n<p>Duret\u00e9, Shore A 18~15<\/p>\n<p>R\u00e9sistance \u00e0 la d\u00e9chirure, kN\/m 0,87~0,76<\/p>\n<p>Allongement, % 90~130<\/p>\n<p>R\u00e9silience, % 9~7<\/p>\n<p>D\u00e9lai de r\u00e9cup\u00e9ration, sec 7~10<\/p>\n<p>&nbsp;<\/p>\n<p>7\u3001Flexural fatigue resistance million times polyether type self-skinned microcellular foam<\/p>\n<p>La mousse peut \u00eatre appliqu\u00e9e aux semelles de chaussures en PU et aux volants.<\/p>\n<p>Exemple :<\/p>\n<p>Daltocel\u00aeF-435 31,64 pbw<\/p>\n<p>Arcol\u00ae34-28 10,0 pbw<\/p>\n<p>Daltocel\u00aeF-481 44,72 pbw<\/p>\n<p>Arcol\u00ae2580 3.0 pbw<\/p>\n<p>Glycol 6,0 pbw<\/p>\n<p>Catalyseur Dabco EG 1,8 pbw<\/p>\n<p>A-1 0,3 pbw<\/p>\n<p>Dabco\u00ae1027 0,3 pbw<\/p>\n<p>Tensioactif \u00e0 base de silicium DC-193 0,3 pbw<\/p>\n<p>L1 412T 1,5 pbw<\/p>\n<p>Eau 0,44 pbw<\/p>\n<p>MDI modifi\u00e9<\/p>\n<p>Suprasec\u00ae2433 71 pbw<\/p>\n<p>&nbsp;<\/p>\n<p>Propri\u00e9t\u00e9s physiques :<\/p>\n<p>Densit\u00e9 de la mousse : environ 0,5 g\u2215cm3<\/p>\n<p>\u03b2-d\u00e9flexion de la courroie, KCS entre 35 et 50, tr\u00e8s bon<\/p>\n<p>&nbsp;<\/p>\n<p>8\u3001Mousse \u00e0 haute r\u00e9silience, retardatrice de flammes et \u00e0 faible \u00e9mission de fum\u00e9e<\/p>\n<p>Avec le d\u00e9veloppement rapide de l'\u00e9conomie nationale, divers d\u00e9partements ont des exigences de plus en plus \u00e9lev\u00e9es en mati\u00e8re de produits en mousse ignifuge, en particulier l'aviation, les voitures, les bus \u00e0 grande vitesse, les canap\u00e9s domestiques, etc., qui n\u00e9cessitent tous des produits en mousse ignifuge, \u00e0 faible teneur en fum\u00e9es, \u00e0 faible toxicit\u00e9 ou non-toxicit\u00e9.<\/p>\n<p>Les auteurs et leurs coll\u00e8gues ont d\u00e9velopp\u00e9 un grade ignifuge (indice d'oxyg\u00e8ne 28 ~ 30%), la densit\u00e9 de la fum\u00e9e est tr\u00e8s faible (l'indice international est de 74, ce produit n'est que de 50 environ), et le rebond de la mousse reste inchang\u00e9, la flamme produisant de la fum\u00e9e blanche.<\/p>\n<p>Exemple de formule :<\/p>\n<p>YB-3081 poly\u00e9ther ignifuge 50 pbw<\/p>\n<p>Poly\u00e9ther hautement actif (OH34) 50 pbw<\/p>\n<p>Tensioactif organosilici\u00e9 B 8681 0,8~1,0 pbw<\/p>\n<p>Eau 2,4~2,6 pbw<\/p>\n<p>DEOA 1,5~3 pbw<\/p>\n<p>Catalyseur A-1 etc. 0,6~1,1 pbw<\/p>\n<p>Indice d'isocyanate 1,05<\/p>\n<p>&nbsp;<\/p>\n<p>Propri\u00e9t\u00e9s physiques :<\/p>\n<p>Densit\u00e9 de la mousse, kg\/m3 \u226550<\/p>\n<p>R\u00e9sistance \u00e0 la compression, kPa 5,5<\/p>\n<p>R\u00e9sistance \u00e0 la traction,kPa 124<\/p>\n<p>R\u00e9silience, % \u226560<\/p>\n<p>D\u00e9formation par compression, 75% \u22648<\/p>\n<p>Indice d'oxyg\u00e8ne, OI% \u2265 28<\/p>\n<p>Densit\u00e9 de fum\u00e9e \u226450<\/p>\n<p>&nbsp;<\/p>\n<p>9\u3001L'eau comme agent gonflant, mousse \u00e0 peau int\u00e9grale respectueuse de l'environnement<\/p>\n<p>Les pays \u00e9trangers ont compl\u00e8tement interdit l'agent gonflant HCFC-141b, l'agent gonflant du syst\u00e8me CP est inflammable, le prix de l'agent gonflant du syst\u00e8me HFC-245fa, HFC-365mfc est \u00e9lev\u00e9, il est difficile de l'accepter, la seule solution est de synth\u00e9tiser une mousse \u00e0 peau int\u00e9grale respectueuse de l'environnement avec de l'eau comme agent gonflant. Dans le pass\u00e9, les producteurs de PU nationaux et \u00e9trangers n'ont pr\u00eat\u00e9 attention qu'\u00e0 la modification du poly\u00e9ther et de l'isocyanate, de sorte que la mousse constitu\u00e9e de la couche superficielle n'est pas claire et pr\u00e9sente une densit\u00e9 \u00e9lev\u00e9e.<\/p>\n<p>Un groupe de formulations est maintenant recommand\u00e9, qui se caract\u00e9rise par<\/p>\n<p>Le polyol poly\u00e9ther de base reste inchang\u00e9, en utilisant le Mn5000 ou 6000 conventionnel.<br \/>\nL'isocyanate reste inchang\u00e9 et il est possible d'utiliser du C-MDI, du PAPI ou du MDI modifi\u00e9.<br \/>\nL'utilisation d'additifs sp\u00e9ciaux SH-140 permet de r\u00e9soudre les probl\u00e8mes suivants -<br \/>\nFormule de base :<\/p>\n<p>Terpolyol de poly\u00e9ther hautement actif Mn5000 65pbw<br \/>\nSH-140* 35pbw<br \/>\nAgent de croissance de la cha\u00eene : 1,4-butanediol 5pbw<br \/>\nAgent de r\u00e9ticulation : Glyc\u00e9rol 7pbw<br \/>\nOuvreur de pores : K-6530 0,2~0,5pbw<br \/>\nCatalyseur A-2 1,2~1,3pbw<br \/>\nP\u00e2te colorante quantit\u00e9 mod\u00e9r\u00e9e<br \/>\nEau 5pbw<br \/>\nMR-200 45pbw<br \/>\nNote : *SH-140 est notre produit.<\/p>\n<p>&nbsp;<\/p>\n<p>Propri\u00e9t\u00e9s physiques :<\/p>\n<p>Densit\u00e9 globale de la mousse 340~350kg\/m3<\/p>\n<p>Produit : Surface lisse, cro\u00fbte claire, faible densit\u00e9.<\/p>\n<p><!-- lc-commercial-start --><\/p>\n<h2>How buyers usually evaluate coating and ink additives<\/h2>\n<p>Additive selection is usually most effective when the team defines the defect first and then screens compatibility, dosage range, and process stage. That is often much more reliable than choosing only by chemistry family or by a single dramatic lab result.<\/p>\n<ul>\n<li><strong>Start from the defect, not the additive name:<\/strong> wetting loss, crater, microfoam, and instability often need different solutions even inside the same formula.<\/li>\n<li><strong>Check compatibility at the intended dosage:<\/strong> the strongest additive can still be the wrong commercial choice if it narrows the process window too much.<\/li>\n<li><strong>Review the stage of use:<\/strong> some products are most useful during grind, while others matter more during let-down, filling, or final application.<\/li>\n<li><strong>Balance cure or film quality with defect control:<\/strong> the right additive fixes the problem without sacrificing adhesion, gloss, or appearance.<\/li>\n<\/ul>\n<h3>Recommended product references<\/h3>\n<ul>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/fr\/product\/chlumiaf-094\/\">CHLUMIAF 094<\/a>:<\/strong> A balanced defoamer reference for waterborne coatings and many general foam-control screens.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/fr\/product\/chlumiaf-3062\/\">CHLUMIAF 3062<\/a>:<\/strong> Useful when printing-ink and UV-ink compatibility matter in the defoaming screen.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/fr\/product\/chlumiaf-3037\/\">CHLUMIAF 3037<\/a>:<\/strong> A stronger process-defoaming option when persistent foam survives harsher conditions.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/fr\/product\/chlumiwe-3280\/\">CHLUMIWE 3280<\/a>:<\/strong> A strong wetting-agent reference for inks, coatings, and difficult substrate wetting.<\/li>\n<\/ul>\n<h3>FAQ for buyers and formulators<\/h3>\n<p><strong>Why does an additive that looks powerful in a beaker sometimes fail in production?<\/strong><br \/>Because shear, temperature, substrate, and the full formula can all change the way the additive performs under real process conditions.<\/p>\n<p><strong>Should the most aggressive additive always be preferred?<\/strong><br \/>Not usually. The best additive is the one that solves the real defect while preserving the broadest safe operating window.<\/p>\n<p><!-- lc-commercial-end --><\/p>","protected":false},"excerpt":{"rendered":"<p>1\u3001Typical formula and performance of block polyether type PU soft foam Polyether ternary alcohol 100pbw TDI80\/20 46.0pbw Organic tin catalyst 0.4pbw Tertiary amine catalyst 0.2pbw Organosilicon foam stabiliser 1.0pbw Water<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[114],"tags":[],"class_list":["post-6974","post","type-post","status-publish","format-standard","hentry","category-catalysts-chemical-auxiliary-agents"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.3.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What are the specific applications of polyurethane catalysts in several typical polyurethane flexible foams? 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