GENIOSIL® STP-E30
Dimethoxy(methyl)silylmethylcarbamat-terminierter Polyether
- CAS编号 611222-18-5
特性
Name:000010064GENIOSIL® STP-E30 ist ein silanterminiertes Polymer auf Polyetherbasis, das sich als Bindemittel in feuchtigkeitshärtenden Formulierungen eignet. Es ist eine klare Flüssigkeit mit einem leichten, aber charakteristischen Geruch und unterscheidet sich von herkömmlichen silanterminierten Polymeren durch seine hohe Reaktivität. Dies ist eine direkte Folge der strukturellen Nähe des Stickstoffatoms zum Siliziumatom in der Dimethoxy(methyl)silyl-methylcarbamat-Gruppe (Alpha-Effekt). Es hydrolysiert in Gegenwart von Feuchtigkeit und bildet schließlich ein stabiles Siloxannetzwerk, das durch eine selbstständig ablaufende Katalyse im Gegensatz zu Schwermetall Katalysatoren initiiert wird. Die Formulierungen zeichnen sich durch die folgenden Vorteile aus:
einfache Compoundierung mit
herkömmlichen Hilfsmitteln
frei von Weichmachern, falls erwünscht
zinnfrei
transparente Systeme
gute Mechanik
schnelle Aushärtung
breites Haftungsprofil
lange Lagerfähigkeit
GENIOSIL® STP-E30的特殊性能
- 不含异氰酸酯
- 不含有机锡催化剂
- 专为低模量透明配方设计的聚合物
- 形成的粘结剂具有耐酸性，可抵御雨水侵蚀
GENIOSIL® STP-E30 dissolves readily in standard organic solvents. It is virtually insoluble in aqueous media, and reacts slowly releasing methanol and forming a resinous deposit. Despite its highly reactive terminal groups, uncatalyzed GENIOSIL® STP-E30 is stable in air for several days. However, its reactivity with water or atmospheric humidity must be taken into account during storage and processing, since the material will slowly start to condense. GENIOSIL® STP-E30 can be formulated by conventional methods and mixing processes. Its formulation composition depends on the required property profile. GENIOSIL® STP-E30 can be formulated with a variety of fillers. The range starts with oxides, such as aluminum hydroxide, quartz powders or pyrogenic silica, and extends to coated and uncoated chalks. The type and amount depends on the mechanical needs as well the desired thixotropy. Water scavengers can be added to stabilize the formulations against premature curing as this is moisture-curing technology. Therefore exclusion of moisture during compounding and storage is necessary. GENIOSIL® XL 10 or GENIOSIL® XL 70 are particularly suitable scavengers. Any kind of plasticizer can be used to further lower the viscosity as well as to impact elongation values. It has been observed, that polypropylene glycol types give better mechanical performance whereas aromatic plasticizers like trimellitates or phthalates yield good adhesion values. Antioxidants, UV- and light-stabilizers are mandatory to ensure durable sealants and adhesives. The amount and kind of stabilizer depends on application needs. Curing of GENIOSIL® STP-E30 requires a catalyst that does not necessarily have to be organo-metallic. However dioctyl tin may be used if required. Catalysis can also be accelerated with titanium compounds, as well as inorganic (phosphoric) or organic (tartaric) acids. Primarily, we recommend using an amine catalyst, and adjusting the skin-formation time by varying the amount of aminosilane used. GENIOSIL® GF 9 and GENIOSIL® GF 95 have proven particularly advantageous here. In particular, GENIOSIL® GF 95 can attain improved water resistance, which is further increased by the addition of epoxy silanes. Surface Treatment Always apply the formulation to clean and dry surfaces.
GENIOSIL® STP-E30 is used as a reactive binder for sealants and adhesives, potting compounds and coatings. Curing takes places at ambient temperature in the presence of both moisture and catalyst. Depending on the formulation, either prepared as one-part or two-part systems, shows good adhesion to a wide variety of substrates even without pretreatment. The low glass transition temperature allows stable mechanical properties over a wide temperature range.