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vinnapas® ll 8588: the new additive for room ... - Wacker Chemie

vinnapas® ll 8588: the new additive for room ... - Wacker Chemie

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The shift from open-mold to infusion<br />

processes reduces emissions and increases<br />

productivity. However surface<br />

defects are often a major problem<br />

especia<strong>ll</strong>y at faster curing rates.<br />

WACKER’s <strong>new</strong> low-profile <strong>additive</strong><br />

VINNAPAS ® LL <strong>8588</strong> efficiently compensates<br />

shrinkage and thus prevents<br />

fiber print-through.<br />

A New Class of PVAc-Copolymers<br />

VINNAPAS ® LL <strong>8588</strong> is a block-type<br />

copolymer of styrene, butyl acrylate and<br />

vinyl acetate with hard and soft segments.<br />

This constitutes a completely <strong>new</strong><br />

class of block-type PVAc-copolymers<br />

and at <strong>the</strong> same time a <strong>new</strong> class of low-<br />

profile <strong>additive</strong>s specifica<strong>ll</strong>y designed <strong>for</strong><br />

low and <strong>room</strong>-temperature composite<br />

processes.<br />

Efficient Compensation of Shrinkage<br />

VINNAPAS ® LL <strong>8588</strong> efficiently compensates<br />

shrinkage of unsaturated polyesters,<br />

DCPD resins and vinyl ester resins, thus<br />

improving <strong>the</strong> surface quality and certain<br />

mechanical properties of fiber rein<strong>for</strong>ced<br />

laminates.<br />

Tailor-Made Additive <strong>for</strong> Infusion<br />

Processes<br />

The low solution viscosity makes it an<br />

ideal product <strong>for</strong> vacuum infusion and<br />

RTM processes. In contrast to conventional<br />

low-profile <strong>additive</strong>s, VINNAPAS ®<br />

LL <strong>8588</strong> does not require elevated curing<br />

temperatures. Depending on <strong>the</strong> resin,<br />

it can even be used successfu<strong>ll</strong>y at<br />

temperatures significantly below <strong>room</strong><br />

temperature e.g. 10 °C.<br />

VINNAPAS ® is a registered trademark of<br />

<strong>Wacker</strong> <strong>Chemie</strong> AG.<br />

Low Water Uptake of Final<br />

Composite Part<br />

VINNAPAS ® LL <strong>8588</strong> induces isolated<br />

microvoids; <strong>the</strong>re<strong>for</strong>e <strong>the</strong> water uptake<br />

of <strong>the</strong> final composite parts is low.<br />

CREATING TOMORROW’S SOLUTIONS<br />

COMPOSITE INDUSTRy I LOW-PROFILE ADDITIVE I VINNAPAS ® LL <strong>8588</strong><br />

VINNAPAS ® LL <strong>8588</strong>: ThE NEW ADDITIVE<br />

FOR ROOM TEMPERATURE PROCESSES<br />

VINNAPAS ® LL <strong>8588</strong>: Typical General Characteristics<br />

Viscosity, 10% in ethyl acetate [mPas]* 2.0 – 3.0<br />

Volatiles [wt %] < 1<br />

Molecular weight SEC [g/mol] ~ 60,000<br />

Tg (DSC) [°C] Tg1~ 42 °C, Tg2~ 67 °C<br />

Viscosity, 40% in styrene [mPas]** 300<br />

*ASTM D 445-06 [mPas] ** Brookfield RVT, 23 °C, 20 RPM<br />

SEM studies show homogeneously distributed isolated microvoids induced by VINNAPAS ® LL <strong>8588</strong><br />

At a Glance:<br />

Unique Properties of VINNAPAS ® LL <strong>8588</strong><br />

• Segmented polymer structure leads to<br />

self-organization in bulk and solution<br />

• Low viscosity and low water uptake<br />

• Exce<strong>ll</strong>ent shrinkage compensation during<br />

<strong>room</strong>-temperature curing <strong>for</strong> UP resins,<br />

DCPD resins and <strong>for</strong> vinyl esters<br />

• Improved surface quality in vacuum<br />

infusion processes


Example Formulation <strong>for</strong> VINNAPAS ® LL <strong>8588</strong> in Infusion Resins<br />

DCPD resin* 60 parts<br />

VINNAPAS ® LL <strong>8588</strong>** 10 parts<br />

Styrene 30 parts<br />

Butanox M 50 1 part<br />

*pre-accelerated resin<br />

** 10 parts solid LPA added<br />

It is important to adjust <strong>the</strong> ratio resin: styrene: LPA and <strong>the</strong> peroxide to <strong>the</strong> specific resin used.<br />

Typical Characteristics of 1-Component Resin Mixture (Example Formulation)<br />

Viscosity 180 mPas<br />

cure Tmax < 30 °C<br />

Expansion 5%<br />

Color Stark white<br />

Left: pure DCPD resin, right: example <strong>for</strong>mulation with VINNAPAS ® LL <strong>8588</strong>. The stark white color<br />

indicates efficient shrinkage compensation.<br />

Example Formulations with Three Different Commercial Resins<br />

Volume shrinkage [%]<br />

12<br />

10<br />

8<br />

6<br />

4<br />

2<br />

0<br />

-2<br />

-4<br />

Resin without LPA Resin + PS Resin + PVAc Resin + VINNAPAS ® LL <strong>8588</strong><br />

Vinyl ester resin Maleic UP resin<br />

DCPD infusion resin Expansion with VINNAPAS ® LL <strong>8588</strong><br />

<strong>Wacker</strong> <strong>Chemie</strong> AG, 81737 München, Germany, Tel. +49 89 6279-1741, Fax +49 89 6279-1770,<br />

info@wacker.com<br />

CREATING TOMORROW’S SOLUTIONS<br />

Significant Improvement of Surface<br />

Quality<br />

In a vacuum-infusion lab test, pure DCPD<br />

resin and an example <strong>for</strong>mulation of DCPD<br />

resin with VINNAPAS ® LL <strong>8588</strong> were<br />

compared. While <strong>the</strong> pure DCPD showed<br />

a massive fiber print-through, <strong>the</strong> example<br />

<strong>for</strong>mulation was impressive with no or very<br />

little fiber print-through.<br />

White gelcoat without skin or barrier coat.<br />

Rein<strong>for</strong>cement: 1 surface veil + 2 layers CSM +<br />

3 layers fabric. Surface veil: HP-P25EF 30 g/m 2 ;<br />

CSM: HP-MP 450 E 450 g/m 2 , fabric: HP-T 750 P<br />

0°/-45 °/+45 ° 750 g/m 2 , total glass content 42%<br />

in both final parts, ~ 50% in laminate<br />

The data presented in this in<strong>for</strong>mation sheet are in accordance with <strong>the</strong> present state of our knowledge but do not absolve <strong>the</strong> user from carefu<strong>ll</strong>y checking a<strong>ll</strong> supplies immediately<br />

on receipt. We reserve <strong>the</strong> right to alter product constants within <strong>the</strong> scope of technical progress or <strong>new</strong> developments. The recommendations made in this in<strong>for</strong>mation sheet should<br />

be checked by preliminary trials because of conditions during processing over which we have no control, especia<strong>ll</strong>y where o<strong>the</strong>r companies’ raw materials are also being used. The<br />

in<strong>for</strong>mation provided by us does not absolve <strong>the</strong> user from <strong>the</strong> obligation of investigating <strong>the</strong> possibility of infringement of third parties’ rights and, if necessary, clarifying <strong>the</strong> position.<br />

Recommendations <strong>for</strong> use do not constitute a warranty, ei<strong>the</strong>r express or implied, of <strong>the</strong> fitness or suitability of <strong>the</strong> product <strong>for</strong> a particular purpose. 6983e/02.13

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