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Northstar Polymers, LLC

3444 Dight Avenue So.

Minneapolis, MN 55406

Tel: 612.721.2911

Fax: 612.721.1009

E-Mail: info@northstarpolymers.com

 

 

Northstar Polymers, LLC is a member of Polyurethane Manufacturers Association.

 

Copy right reserved by Northstar Polymers, LLC 2000 - 2007.

 

 

 

 

 

MPC-W44A

Lower Viscosity, "bio-base" OOO Scale Gel

 

 MPC-W44A is one of our polyurethane gel formulations specifically designed for padding and cushioning application that requires Shore Durometer OOO scale hardness.  With this material, the user can obtain materials with good rebound characteristics and gradual compression deflection rates at the Shore OOO hardness range. 

 

This material contains bio-base renewable raw material.  The concentration of the renewable material can be above 40% by weight depending on the mixing ratio.  This may be classified as bio-base material in certain applications.  The material does not contain any plasticizer, which is known to leach out to have adverse effects to the plastic film encapsulation materials used in conjunction with the polyurethane gel materials. 

 

 This newly developed formula uses MPA-026 prepolymer, which has much lower viscosity than our current standard OOO scale gel material MPP-W43C.  Like other polyurethane gel formulations, this material is made in such way that the user can change the hardness and other physical property of cured part simply by changing the mixing ratio of the given components.  This allows users to make variety products with just one combination of part-A and part-B components.  The applications for this material include cushioning and padding parts for medical/semi-medical application, fiber optic cable encapsulation, novelty products, and many more.  

 

 

System Code:                       MPC-W44A

Part-A:                         MPC-026 (Isocyanate Prepolymer)

Part-B:                         PCA-054 (Curative/ Polyol Blend)

 

Typical Processing Conditions

 Processing Temperature:

Part-A:                         Room Temperature

Part-B:                         Room Temperature

Mold:                            Room Temperature

 

            Curing Pattern (For Room Temperature Process)

Pot life:                                  10 - 15 minutes at ambient temperature

Demolding:                            3 - 6 hours at ambient temperature

Complete Cure:                     3 - 5 days at ambient temperature

 Note: This curing data is the processing parameters of 1:5.316 mixing ratio at room temperature.  The curing rate may vary depending on the mixing ratio chosen for the process. The curing pattern can be modified by addition of a catalyst.

 

 

Mixing Ratios

 

This formulation is made in such way that the user can change the softness of the product by simply changing the mixing ratio of the components.   The following is a guidance to determine the mixing ratio for the softness. 

 

The below charts are reference for the hardness change of the cured gel made with various mixing ratios.  This chart is in Shore Durometer OOO scale.  The mixing ratio range 1: 6 and 1: 8 makes cured gel in Shore OOO range.  

 

 

 

The below chart is in Shore Durometer OO scale.   The mixing ratio range between 1:5 and 1:6 makes cured gel in Shore OO range.

 

 

Source Data:

Stoichiometry

NCO: OH

Weight Ratio

Part-A: Part-B

Volume Ratio

Part-A: Part-B

Hardness

1.00: 2.60

1.000: 5.316

1.000: 6.082

OO 24

1.00: 2.80

1.000: 5.724

1.000: 6.550

OO 14

1.00: 3.00

1.000: 6.133

1.000: 7.018

OO 6

1.00: 3.00

1.000: 6.133

1.000: 7.017

OOO 74-74

1.00: 3.20

1.000: 6.542

1.000: 7.485

OOO 70-70

1.00: 3.40

1.000: 6.951

1.000: 7.953

OOO 62 - 62

1.00: 3.60

1.000: 7.360

1.000: 8.421

OOO 54-54

1.00: 3.80

1.000: 7.769

1.000: 8.889

OOO 38-36

1.00: 4.00

1.000: 8.178

1.000: 9.357

OOO 34-31

 Note: The above data is based on our lab tests, and it is reference only.  The user must test the mixing ratio and yielding hardness for each application.  The product hardness can be controlled more accurately by the stoichiometric ratios.  However, in practice, you may use weight ratio or volume ratio for the parameter value to determine the target hardness unless you have a very narrow tolerance range for hardness.  You may need to adjust your mixing ratio according to the actual hardness produced from different lots of components in order to obtain more accurately consistent results. 

 Recommendations

The mixing ratio setting for your dispensing equipment is critical for determining the hardness of your products.  We recommend the mixing ratio is calibrated by dispensing the two components from the actual lines of the dispensing machine into cups, and use the weight ratio to check for accurate metering. 

This material is often encapsulated in coated cloth materials, polyurethane films, or other resilient materials. The surface of gel product is very sticky, and the gel can be cut or torn easily.  The encapsulation is essential for protection of the gel in some applications.  Please contact us for more information for encapsulation method.  For temporary handling, you may use talc powder to prevent it from sticking to the handlers or equipment.

Use of elevated temperature during the pouring process may cause shrinkage of this material.  Shrinkage will be a critical issue if you are pouring this material directly on a flexible film.  The shrinkage could cause significant wrinkling of the film or warping.  If excessive wrinkle or warping occurs, the processing temperature may need to be lowered and/or processing rate to be slowed.

 Component Data:

 Part-A 

Product Code: 

MPC-026

Description:

Isocyanate terminated prepolymer extended with polyether polyol

%NCO:

16.0 % +, - 0.5%

Equivalent Weight

263

Specific Gravity:

1.137

Physical State at 25 C ( 77 F):

Liquid (dark amber to brown color)

Viscosity at 25 C (77 F):

2000 3000 cps

Storage: 

Store in an airtight container in a dry indoor storage area at room temperature.  The material is highly sensitive to moisture.  After using the content, immediately inject dry nitrogen gas or argon gas into the container to purge and blanket the top space before storing.  Avoid high humidity areas.  The recommended storage temperature is 72 100 F. 

Part-A component has a small amount of sediment at the bottom of the container.  This is a bi-product we cannot avoid making or remove. We do not expect this to affect physical properties of the products significantly; however the product appearance will be affected with the dark color if the sediment enters into your product.  You can blend in this sediment each time you batch (this will make your product look more consistently darker), or you can avoid by not using it at the bottom of the container.

 Part-B 

Product Code: 

PCA-054

Description:

Curing agent based on a blend of polyether polyols and additives

Equivalent Weight:

537

Specific Gravity:

0.993

Physical State at 25 C ( 77 F):

Liquid (clear with yellow tint)

Viscosity at 25 C (77 F)

400 1000 cps

Storage: 

Store in an airtight container in a dry indoor storage area at room temperature.  The material is hygroscopic, and absorption of excess moisture can cause issues when processed. Avoid high humidity areas.  For long-term storage, inject dry nitrogen gas or argon gas into the container to blanket the material.  The storage temperature should be 65 95 F

 Part-B component is consisted of several polyols and additives.  These components may be separate into layers during storage.  It is recommended that the content of part-B container should be agitated to re-blend the constituent before dispensing. 

 

 

Handling Information:

 

Safety:

 

The component materials are industrial-grade chemicals.  Please keep them in a secure place and prevent access from any unauthorized individual.  The personnel who handle these materials need to read the Material Safety Data Sheet (MSDS) for detail information on the safety and handling of the materials.  The MSDS for each component is sent with the material shipment. 

 

When you are using this material, please be sure to operate in a wide-open area with good air movement, or in a well-ventilated area. Wear rubber gloves, long sleeves, and protective eyeglasses to prevent skin/eye contact of the material.  When your operation involves heating or spraying of the material, we recommend, in addition to the above, installation of a proper dynamic ventilation system and/or using a proper respirator to prevent inhalation of the fume.  

 

Direct contact of polyurethane raw materials to skin/eye, as well as ingestion may lead to health problems.  No eating or smoking should be permitted at the working area.  The operator should wash hands well with soap and water after handling the materials.  Please refer to the Material Safety Data Sheet for each component for the detailed health information.

 

Storage:

 

Part-A component (prepolymer) contains isocyanate component, which is very much sensitive to moisture.  If it is left in air, part-A component will react with atmospheric moisture and will be ruined.  This reaction is non-reversible.  Soon after opening a can and dispensing the content, nitrogen gas or negative-40-degree-due-point dry air needs to be injected to the container to blanket the material.  Silica gel or calcium chloride desiccant filter should be installed to 55 gallon drum-vent for your drum dispensing system.  The storage temperature should be at a room temperature between 72 and 100 F.

 

Part-B component may be hygroscopic.  If the material is exposed to ambient air, it may absorb moisture. Moisture contaminated part-B material may become source of degradation or excessive bubbles in the product.  Avoid exposure of the material to air.  Purging the top space in the container with nitrogen gas or negative-40-degree-due-point dry air is also recommended to prevent moisture contamination of part-B. The storage temperature should be at a room temperature between 65 and 95 F.  Store the containers in a dry indoor space.

 

 

 

For any questions, please contact Northstar Polymers.

 

Tel:          612-721-2911 Ext 119

Fax:          612-721-1009

Web Site:     http://www.northstarpolymers.com

E-Mail:       info@northstarpolymers.com

 

Notice: All of the statements, recommendations, suggestions, and data concerning the subject material are based on our laboratory results, and although we believe the same to be reliable, we expressly do not represent, warrant, or guarantee the accuracy, completeness, or reliability of same, or the material or the results to be obtained from the use thereof, neither do we warrant that any such use, either alone or in combination with other materials, shall be free of the rightful claim of any third party by way of INFRINGEMENT or the like, and NORTHSTAR POLYMERS DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, OF MERCHANTABILITY and FITNESS FOR A PARTICULAR PURPOSE.

 

 

Revised 6/8/10

 

Processing Instructions for Test Mix

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For any questions, please feel free to contact us:

 

Northstar Polymers, LLC

3444 Dight Avenue South

Minneapolis, MN 55406

Tel: 612.721.2911

Fax: 612.721.1009

E-Mail: info@northstarpolymers.com