Bio-Base Mold-Making Urethane Materials

Introduction

Northstar Polymers has developed bio-base mold-making materials, which contain more than 40% of renewable materials derived from agricultural products.  The physical properties of these materials are comparable to near-100% petroleum based materials used in this application.  In comparison with the petroleum derived materials, the prices are very competitive, and more importantly, the prices are very stable.  The contained renewable materials include refined soybean oil polyols, whose major raw material is soybeans grown in the United States.    

The formulations are designed to give important characteristics as a mold-making material.  The properties of the formulations include:

• Two-part casting system
• Liquid at room temperature
• Low viscosity of the mixture to create fine resolution
• Allows relatively long pot-life
• Cures within overnight for demolding hardness
• Yields the ideal hardness range for mold materials for concrete products
• Less susceptible to atmospheric moisture in operation

Property Comparisons with the Standard Mold-Making Materials

Our lab tests indicate that these bio-base mold-making materials compare very well against existing petroleum base materials.  The following is the typical properties of the new Bio-Base formulations as well as the standard mold-making materials at two different hardness ranges. 

65A Durometer

        Processing Data of 65A Durometer Bio-Base Formulation

Mixing ratio:                              A:B = 1: 1.50 by volume (1: 1.29 by weight)

Pot Life:                                   About 18 minutes

Demolding:                                16 hours (overnight) at room temperature

Hardness in 24 hours:                55- 45 A

Complete Curing:                       3 days

Hardness in 3 days:                   70 - 62 A

Renewable source materials:  47% by weight

80A Durometer

Processing Data of 85A Durometer Bio-Base Formulation

Mixing ratio:                              A:B = 1: 1.20 by volume (1: 1.04 by weight)

Pot Life:                                   about 20 minutes

Demolding:                                16 hours (overnight) at room temperature

Hardness in 24 hours:                70 – 55A

Complete Curing:                       3 days

Hardness in 3 days:                   85 – 75 A

Renewable source materials:  40% by weight

For any questions, please contact Northstar Polymers.

Tel:                   612-721-2911.

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.            

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