Introduction to the Characteristics and Uses of Polymerized Rosin
Jun 20, 2024
① Name and Properties
- English Name: Polymerized Rosin
- Alternative English Names: Rosin, Polymerised
- CAS Number: 65997-05-9
- Physical Properties: Yellow-brown amorphous solid. Polymerized rosin is primarily composed of dimers, along with a mixture of rosin and rosin hydrocarbons. It is characterized by light color, high softening point, non-crystallinity, high acid value, low hot water-soluble content, good oil solubility, and light lead acetate discoloration. Dimers account for 20% to 50% and are relatively stable, resisting oxidation. It is soluble in organic solvents such as toluene, gasoline, petroleum ether, chloroform, and dichloroethane.
Properties |
Target Values (Spec Limits)
|
Type
|
PR 90 |
PR 115 |
PR 140 |
Appearance
|
Yellow Transparent Solid |
Color Gardner
|
≤7 |
≤10
|
≤10 |
Softening Point (R&B)°C
|
88-93 |
110-120 |
135-145 |
Acid Value, mgKOH/g
|
≤165 |
≥145 |
≥140 |
Density (20°C, abt., g/cm³)
|
1.08-1.1 |
1.08-1.1 |
1.08-1.1 |
② Chemical Formula or Molecular Formula and Structural Formula
- Molecular Formula: C40H60O4 (Note: This is a simplified or representative molecular formula, as polymerized rosin is a mixture, so the specific structure may vary depending on the degree of polymerization.)
③ Physical and Chemical Properties and Quality Indicators
- Softening Point: 90 to 120°C (This is the temperature range at which polymerized rosin begins to flow when heated.)
- Acid Value: 150 mg KOH/g (This is a measure of the acidic component content in polymerized rosin, typically expressed as the milligrams of potassium hydroxide required to neutralize 1 gram of the sample.)
- Other Quality Indicators: See the provided table.
④ Main Applications
- As a Tackifying Resin: Used in hot-melt, pressure-sensitive, and solvent-based adhesives to enhance adhesion and provide reinforcement effects.
- Improving Bonding Strength: Enhances the heat sensitivity of adhesive tapes and improves bonding strength.
- Reducing Product Costs: Can partially replace other costlier resins, such as terpene resin and petroleum resin.
- EVA Hot-Melt Adhesive: Provides optimal comprehensive performance when used in EVA hot-melt adhesives. The usage amount is typically optimized based on specific applications and desired properties, but 50% usage is often recommended, or 120 parts by mass for maximum peel strength.
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