United Initiators ACH-80-AL3 1,1-Di(tert.-amylperoxy)cyclohexane 15667-10-4

Product Description.

• ACH-80-AL3 is a colorless flowable liquid containing approximately 80% w/w of 1,1-tert-butyl cyclohexyl peroxide desensitized by alkane hydrocarbons. This cyclohexyl peroxide is used as a cure initiator (free radical source) for unsaturated polyester resins.
• Main areas of application: Thermal compression molding of SMC or BMC in the temperature range of 130 - 150°C (266 - 302°F).

Technical data.

• Appearance: Colorless liquid
• Desensitizer: Alkyl hydrocarbons
• Content: approx. 80% w/w
• Active Oxygen (AO) content: approx. 8.8% w/w
• Density (20°C): approx. 0.90 g/cm³
• Viscosity (20°C): approx. 6.7 mPa-s
• Refractive index (20°C): approx. 1.441
• Key temperature (SADT): approx. 60°C / 140°F
• Refrigeration stability: approx. -20°C / -4°F
• Starting temperature: approx. 80°C / 176°F
• Recommended storage temperature: below 30°C / 86°F
• Period of validity after delivery: 6 months
• Standard Packaging: HDPE Drums, 35 lbs and 25 kg

Applications.

• Curing agent for unsaturated polyester resins in the temperature range of 120 - 160°C (248 - 320°F).
• Use rate: 0.5 - 2.5%.
• "Shelf life" (gel time of resin + peroxide) varies from weeks to months at room temperature depending on the resin type and is virtually unaffected by fillers and pigments, cobalt salts, or tertiary aromatic amines.
• By adding the inhibitor BC 500 with 0.1 - 0.31 TP3T, shelf life can be significantly extended.

Curing Properties.

• In the range of 75 - 90°C (167 - 194°F) ("start-up" temperature), the cure rate will not be high if the heat of reaction does not result in warming (e.g., in a hot mold).
• A truly short cure time of 1 - 3 minutes can only be achieved at temperatures above 115°C (239°F).
• The optimum temperature range for thermocompression molding is 125 - 150°C (257 - 302°F).
• ACH-80-AL3 provides improved surface properties for SMC parts.

Curing Process.

• Mainly used for hot press molding of sheet molding compound (SMC) or block molding compound (BMC).

Reactivity.

• ACH-80-AL3 reacted slightly faster than CH-80-AL in standard n-butylphenol polyester molding resin.

Decomposition products.

• Decomposition products that may be detected: tert-butyl alcohol, acetone, cyclohexanone, caprolactone, caprylic acid

Storage.

• Avoid heat, light, humidity and protect the product from impurities.
• Stay within safe temperature limits.

Disclaimer.

• The information and technical advice provided in the document reflects United Initiators' current knowledge and experience of products and applications based on its internal research and development.
• United Initiators makes no warranty with respect to the information provided as to the specific performance of the product, its suitability for a particular application, or complete instructions for use.
• United Initiators does not guarantee the performance of the products and shelf life, nor does it assume legal liability for the use of the products, including in relation to existing third party intellectual property rights, in particular patents.
• United Initiators reserves the right to make any changes based on technological advances or further developments.
• The use and application of our products based on technical recommendations is not under our control and is strictly at the user's own risk, who remains obliged to carefully inspect and test the incoming product to verify its suitability for the intended application.