瓦克硅烷改性聚合物STP E15

Product description

Structural formula:

CAS No.:

2

Trimethoxysilylpropylcarbamate-terminated polyether

Properties

GENIOSIL® STP-E 15 is a polyether-based silane

terminated polymer suitable as a binder in moisture  

curing formulations. It is a clear liquid with a slight but  

characteristic odor and differs to conventional silylated  

polymers due to its high reactivity. This is a direct  

consequence of the trimethoxysilyl group attached to  

the organic backbone. It hydrolyzes in the presence of  

moisture to finally form a stable siloxane network  

initiated by heavy metal or strong amine catalysis.  

Formulations are characterized by the following  

advantages:

Special features

- simple compounding with

conventional auxiliaries

- plasticizer free if desirable

- good mechanics

- rapid curing

- broad adhesion profile

Application

GENIOSIL® STP-E 15 is used as a reactive binder for  

adhesives, potting compounds and coatings. Curing  

takes place at ambient temperature in the presence of  

both moisture and catalyst. Depending on the  

formulation, either prepared as one-part or two-part  

systems, it will give 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.

Processing

GENIOSIL® STP-E 15 dissolves readily in standard  

organic solvents. It is virtually insoluble in aqueous  

media, and reacts slowly releasing methanol and  

forming a resinous deposit. Due to its reactive terminal  

groups GENIOSIL® STP-E 15 forms a skin following  

air exposure after 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-E 15 can be formulated by conventional methods  

and mixing processes. The formulation composition  

depends on the required property profile.

GENIOSIL® STP-E 15 can be formulated with a variety  

of fillers at high addition levels. The range starts with  

oxides, such as aluminum trihydroxide, quartz powders  

or pyrogenic silicas, and extends to coated and  

uncoated chalks.

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 type 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 type of stabilizer depends on application needs.

Curing of GENIOSIL® STP-E 15 requires a catalyst  

which can be organo-metallic or a strong base  

compound. Here dioctyl tin or titanium compounds  

have proven their suitability in the presence of an  

aminosilane such as GENIOSIL® GF 96. In particular,  

GENIOSIL® GF 95 can attain improved water  

resistance, which is further increased by the addition of  

epoxy silanes.

GENIOSIL® STP-E 15

HYBRID POLYMERTechnical data sheet for GENIOSIL® STP-E 15 / Version: 1.4 / Date of last alteration:

2 / 2

Surface Treatment

Always apply the formulation to clean and dry  

surfaces.

Storage

The 'Best use before end' date of each batch is shown  

on the product label.

Storage beyond the date specified on the label does  

not necessarily mean that the product is no longer  

usable. In this case however, the properties required  

for the intended use must be checked for  

assurance reasons.

Packaging

Information on available container sizes is obtainable  

from WACKER subsidiaries.

Safety notes

Comprehensive instructions are given in the  

corresponding Material Safety Data Sheets. They are  

available on request from WACKER subsidiaries or  

may be printed via WACKER web site  

//www.wacker.com.

Product data

Typical general characteristics

Inspection Method

Value

Polymer

Polypropylene glycol  

Reactive terminal groups

Trimethoxysilylpropylcarba

mate  

Flash point

ISO 2592

> 250 °C

Ignition temperature (liquids)

DIN 51794

390 °C

Density at 25 °C, at 1013 hPa

DIN 51757

1,0064 g/cm³

Viscosity, dynamic at 25 °C

DIN 51562

approx. 10000 mPa.s

Methoxy group content

approx. 0,50 - 0,70 mmol/g