Energy savings plus mechanical reinforcement and rheology control

2K Polybutadiene Encapsulants and Adhesives (Polyester)

Adhesives Formulation

Applicable Type

Epoxy Adhesives

Applicable Base Polymer

Polybutadienes

Applicable Industrial Sectors

Automotive , Electrical & Electronic Bonding

Applicable Base Polymer Properties

Polyurethanes are extensively and successfully used as adhesives and sealants, and they:

Have an excellent record of durability
Form tough bonds with high peel strength
Have better low temperature strength than other adhesives
Have exceptionally high strength at cryogenic temperatures
Have good chemical resistance, although not generally as good as epoxies or acrylics

Urethanes do not have high temperature resistance. Maximum upper use limits are about 150°C, and most formulations are used below 100°C.

Typical Formulation Ingredients

Phase

Ingredient

Parts by weight

Hyrdoxy terminated polybutadiene resin (Poly bd R45HTLO, Cray Valley)

xxxx

Maleinized polybutadiene (Ricon 131MA10, Cray Valley)

xxxx

Tertiary amine (AC-30, Anhydride and Chemicals Inc.)

xxx

Typical Properties

Properties

Hardness, Shore A

Tensile strength, psi

Dielectric constant, 25°C, 1 kHz

xxxx

Volume resistivity, 25°C, 1,000 Hz

xxxxx

Moisture vapor transmission, 10-3 metric perm-cm

xxx

Volume resistivity, 25°C, 1,000 Hz

xxxx

Processing

Resulting Properties

Poly bd R45HTLO is a hydroxyl terminated polybutadiene resin with a number average molecular weight of approximately 2800. Has primary, allylic alcohol groups that exhibit high reactivity in either condensation polymerization reactions or the preparation of derivatives. Exhibits low moisture permeability, resistance to aqueous acids and bases, low temperature flexibility and electrical insulation properties. Used in waterproof coatings and membranes. Possesses low color and high clarity.

Ricon 131MA10 acts as an amber colored liquid resin. It exhibits polybutadiene as a starting material and adds functional groups to this backbone. The functional groups that are added can react with epoxy, amines and hydroxyls. Its benefits include that the polybutadiene backbone improves the moisture resistance of the final product, liquid nature allows for easy mixing. It can be used in place of or in addition to anhydrides typically used in anhydride based epoxy systems.

Poly bd 605 is an epoxidized, hydroxyl terminated polybutadiene resin. It brings hydrophobicity, flexibility and water resistance to urethane applications. In addition, oxirane oxygen groups on the polymer backbone allow it to be used as the sole resin in epoxy formulations or in combination with bisphenol A or cycloaliphatic epoxy resin formulations, where 600E resin improves the flexibility and impact resistance. Possesses aqueous acid and base resistance and adhesion to a variety of substrates.

(Source: Yoo, T. and Chao, H., “Hydroxyl-Terminated Polybutadiene Liquid Resins for Adhesives Applications”, Adhesivesmag.com, January 6, 2017.)

Tips and Tricks

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx