Organic Binders for Use in Brazing Pastes - QPAC®

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Poly(alkylene carbonates) are synthesized through the polymerization of carbon dioxide and epoxides. The products of their combustion are carbon dioxide and water vapor, which are non-toxic, non-flammable, and environmentally safe. They burn cleanly in any environment, oxidizing or inert. They are colorless, amorphous thermoplastic polymers with low glass transition temperatures.

QPAC Organic Binders for Brazing Applications

QPAC® is ideally suited for use as an organic binder in brazing pastes and solutions.

The Benefits of Using QPAC25 and QPAC40 Organic Binders

The benefits of using QPAC®25 and QPAC®40 organic binders include the following:

  • QPAC® is compatible with a variety of filler metals.
  • The viscosities and molecular weights of QPAC® can be custom-tailored for specific solution or paste requirements.
  • Both grades of QPAC® is naturally “tacky” and their degrees of plasticity can be adjusted as necessary.
  • Decomposition is complete through three phases: solid, liquid, and vapor.
  • Upon decomposition, QPAC® leaves very low ash residue with the complete burn-out of carbon.
  • QPAC® decomposes completely between 250°C - 300°C, which can be as much as 100°C below the decomposition temperatures of other binders.

Other QPAC25 and QPAC40 Organic Binder Applications

Applications of QPAC®25 and QPAC®40 organic binders includes:

  • Diamond Powder Bonding
  • High Energy Capacitors
  • Air Bag Inflator Propellants
  • Thick Film Inks
  • Die Attach Adhesives
  • Ceramic Fiber Processing

Properties of QPAC25 and QPAC40 Organic Binders

The properties of QPAC®25 and QPAC®40 organic binders are outlined in the following table.

QPAC®25 - PEC - poly(ethylene carbonate)

Density

1.42

Chemical formula

[CH2CH2OCO2]n or C3H4O3

Tensile strength

500 - 1,500 psi

Solvents

Methylene chloride, Chloroform, and 1,2-Dichloroethane

Tg

25°C

QPAC®40 - PPC - poly(propylene carbonate)

Density

1.26

Chemical formula

[CHCH3CH2OCO2]n or C4H6O3

Tensile strength

5,000 - 6,000 psi

Solvents

Methylene chloride, MEK, Acetone & Propylene carbonate

Tg

40°C

This information has been sourced, reviewed and adapted from materials provided by Empower Materials.

For more information on this source, please visit Empower Materials.

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