Praeparatio et characteres de polyurethane semi-rigidum spumam ad altus-perficientive automotive handrails.
Et brachia in intus in currus est momenti pars CAB, qui ludit partes propellentibus et trahens ostium et ponens brachium in persona in currus. In eventu de emergency, cum currus et Handrail occursum, Polyurethane mollis Handrail et mutatio Pp (Polypropylene), abs (PolyacryLonitrile - Butadiene, potest providere bonum elasticity et quiddam, ita reducendo bonum elasticitas et quiddam, ita reducendo iniuriam. Polyurethane mollis spuma handrails potest providere bonum manus sentire et pulcher superficiem textura, ita improving consolationem et pulchritudinem de cockpit. Ideo cum progressionem in eget industria et emendationem populi scriptor requisitis ad interiora materiae, commoda polyurethane mollis spuma in Books handrails sunt magis et manifestum.
Sunt tres species polyurethane mollis handrails: High molliter spumam, auto-casus spumam et semi-rigidum spumam. In exteriore superficies alta mollientia handrails tegitur PVC (polyvinyl chloride) cutis et interior est polyurethane altum mollitiam spumam. In auxilium de spumam est relative infirma, vires est relative humilis, et adhaesionem inter spumam et cutis est relative satis. Et auto-pelli handrail habet spumam core iacuit de cutis, humilis sumptus, excelsum integrationem gradu, et late in commercial vehiculis, sed difficile ad rationem robore superficiei et altiore consolatione. Semi-rigidum Armrest est operuit cum PVC cutis, cutis praebet bonum tactus et apparentia, et internum semi-rigidum spumam habet optimum sentire, impulsum resistentia, industria effusio et senescentem resistentia, ita et magis et late usus est in usu car intus.
In hac charta, in basic formula polyurethane semi-rigidum spuma pro automobile handrails est disposito, et sua emendationem studuit in hac basis.
Sectionalis
Principalis rudis materia
Polyether Polyol A (XL mg hydroxyl valorem ~ XL / g), polymer polyol B (Hydroxyl valorem XXV ~ XXX mg / g) Wanhua eget coetus Co., Ltd. Medi modified [Diphenylmethane Diisocyanate, W (NCO) XXV% ~ XXX%], composita catalyst, wetting dispersant (III), Antioxidant A: Ltd., Maitou, etc..; Wetting dispersant (agente I), wetting dispersant (agente II) byke eget. Et super rudis materiae sunt industriae gradus. PVC tunica pelle: Changshu Ruiua.
Pelagus apparatu et instrumentis
SDF-CD Type High-Mixer, Ar3202CN Type Electronic Libra, Aluminium Fingite (10cm × 10cm × 1CM, 10cm × 10CM × cliban, 101-4AB type electronic universae tensio machina, 501a type super thermostat.
Praeparatio basic formula et sample
In basic formula semi-rigido polyurethane spumam ostenditur in mensa I.
Preparation of the mechanical properties test sample: the composite polyether (A material) was prepared according to the design formula, mixed with the modified MDI in a certain proportion, stirred with a high-speed stirring device (3000r/min) for 3~5s, then poured into the corresponding mold to foam, and opened the mold within a certain time to obtain the semi-rigid polyurethane foam molded sample.
Preparation of the sample for bonding performance test: a layer of PVC skin is placed in the lower die of the mold, and the combined polyether and modified MDI are mixed in proportion, stirred by a high-speed stirring device (3 000 r/min) for 3~5 s, then poured into the surface of the skin, and the mold is closed, and the polyurethane foam with the skin is moulded within a certain time.
ERECTIC
Mechanica Properties: XL% Cld (compressive durum) secundum Iso-MMMCCCLXXXVI vexillum test; Tensile vires et elongatio ad confractus probata secundum Iso-MDCCXCVIII Latin; Scindite fortitudinem probata secundum Iso-(VIII) LXVII Latin. Bonding euismod: et electronic universae tensio apparatus est ad excorio cutis et spumam CLXXX ° secundum vexillum est.
Seneca euismod: test in damnum mechanica proprietatibus et vinculum proprietatibus post XXIV horas senescentis ad CXX ℃ secundum ad vexillum temperatus in OEM.
Results et disputationem
Mechanica res
Per mutantur Ratio polyether polyol et polymer polyol B in basic formula, in potentia diversis polyether dosis in mechanica proprietatibus semi-rigidum Polyurethane spumam exploratur, ut ostensum est in Tabula II.
Non potest esse ex eventus in mensa II quod ratio Polyether polyol ad polymer polyol B habet a significant effectus in mechanica proprietatibus polyurethane spumam. Cum polyether polymer polyol Polyol B crescit, elongatio ad confractus crescit, in compressor duritiam decrescit ad quantam et tensile vires et sciderit vires mutare parum. Molecular torquem Polyurethane maxime consistit mollis segmentum et durum segmentum, mollis segmentum a polyol et dura segmentum ex carbamate vinculum. De una parte, relativum Molecular pondus et hydroxyl valorem duorum polyols diversis, in alia manu, Polymer Polyol B est a polyether polyol in acryonitrile et austeribus, et torques, cum Polymer, et in Mycene Moleculares, cum Polymer, quod est in Molyculares, quod est in Flendiness in Femin spumam. Cum polyether polyol A est LXXX partes et polymer polyol B est X partes, comprehensive mechanica proprietatibus in spumam sunt meliora.
Bonding proprietas
Ut a uber cum magno torcular Frequency, Handrail et significantly reducere consolationem partium si spumam et cutis cortices, ita et in vinculo perficientur polyurethane spumam et cutis est. De ex supradicto investigationis, diversis madefecissem dispersants addita temptare adhaesionem proprietatibus spumam et cutem. Eventus sunt ostensum est in mensa III.
It can be seen from Table 3 that different wetting dispersants have obvious effects on the peeling force between the foam and the skin: Foam collapse occurs after the use of additive 2, which may be caused by excessive opening of the foam after the addition of additive 2; Post usum additives I et III, et exuentes robur in blank sample habet quaedam incremento, et ex nudaveritis robur in II de blank est de XXV% altior quam de blank est de blank. Differentia inter additive I et additive III est maxime causatur per differentiam in wentability composita materia super superficiem. In generali, ut aestimare ad widyctily liquidi in solidum, in contactus angulus est momenti modularis ut metiretur superficiem wettability. Ideo contactus angulus inter compositum et cutis post addendo super duo madefecissimo dispersants et probata, et eventus sunt ostensum est in Figura I.
Potest videri potest a figure I, quod in contactus angulus blank sample est maximum, quod est XXVII ° et contactus angulus auxilia III est minima, quae non solum XII °. This shows that the use of additive 3 can improve the wettability of the composite material and the skin to a greater extent, and it is easier to spread on the surface of the skin, so the use of additive 3 has the greatest peeling force.
Senescit res
Handrail products sunt pressed in car, frequency de solis nuditate est princeps, et senescit perficientur est alius maximus perficientur quod Polyurethane semi-rigidum Handrail spuma habet considerare. Ideo et senescit perficientur de basic formula temptavit et emendationem studium fuit ferri ex, et eventus fuerunt ostensum est in mensa IV.
Per comparet notitia in mensa IV, quod potest inveniri quod mechanica proprietatibus et vinculum proprietatibus in basic formula sunt significantly minuatur post scelerisque senescit in CXX ℃, post densitatem (idem deorsum) is XIII% XVI%; In perficientur damna 24h senescit est XXIII% ~ XXVI%. Est quod calor senescentis proprietas ex basic formula non est bonum, et calor senescentis proprietas originalis formulae potest manifesto melius addendo a classis antioxidant ad formulam. Sub eadem experimentalis conditiones post additionem antioxidant a, damnum variis proprietatibus post 12h erat VII% ~ VIII%, et damnum de variis proprietatibus post 24h erat XIII% ~ XVI%. The decrease of mechanical properties is mainly due to a series of chain reactions triggered by chemical bond breakage and active free radicals during the thermal aging process, resulting in fundamental changes in the structure or properties of the original substance. De una parte, declines in vincula perficientur est debitum ad declines in mechanica proprietatibus de spumam se, in alia manu, quia PVC cutis continet numerus plasticizers et plasticizer in superficiem durante processus of thermal oxygeni in superficiem durante processus of thermal oxygeni in superficiem durante processus of thermal oxygeni in superficie durante processus of thermal oxygeni in superficiem durante processus in PLSTMAL COMMENTUM in superficiem durante processus of thermal oxygeni in superficiem durante processus of thermal oxygeniensis senescit. Et addition of antioxidants potest amplio eius scelerisque senescentis proprietatibus, maxime quod antioxidants potest eliminare nuper generatae liberum radicalis, mora vel inhibere oxidatio processus of Polymer, ita ut ponere in proprietatibus Polymer.
Comprehensive perficientur
Ex praedicta results, optimal formula disposito et eius variis proprietatibus aestimari. In perficientur formula comparatur cum eo de communi Polyurethane princeps resillandi Handrail spumam. Eventus sunt ostensum est in mensa V.
Sicut potest videri a mensa V, in perficientur optimal semi-rigidum polyurethane spumam formula est quaedam commoda super basic et generales formulae, quod est practicus et idoneam ad applicationem altus-handrails.
Conclusio
Adjusting moles polyether et eligens qualified madefecissem dispersant et antioxidant potest dare semi-rigidum Polyurethane spuma bonum mechanica proprietatibus, optimum calor senescentis proprietatibus et sic in. Ex optimis perficientur de spumam, hoc summus perficientur polyurethane semi-rigidum spuma uber potest applicari ad automotive quiddam materiae ut handrails et instrumentum tables.
Post tempus: Jul, 25-2024