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allnex to Participate in FOCUS 2019

1 мая 2019 г Trade Show

ALPHARETTA, (April 30, 2019) - allnex, a leading supplier of specialty chemicals, offering a broad range of coating resins, additives and crosslinkers for use on wood, metal, plastic and other surfaces, is pleased to announce our participation in FOCUS (Future of Coatings Under Study) taking place May 9, 2019 in Plymouth, MI.

For 43 years the FOCUS conference has provided a forum to discuss the most pressing issues affecting the coatings industry. FOCUS 2019 will continue to highlight coatings and factory improvements with respect to applying today’s latest coating technologies to automotive bodies and add-on parts.

At the allnex stand, our experts will be on-hand to discuss our extensive product lines used in the Automotive Coatings segment, including:

  • Resins for Clearcoats, Sag Control Agents, Basecoats, Plastic Parts, Primers and Electrocoat
  • Additives for Anti-Crater, Adhesion, Color Stability, Improved Appearance, Aluminum Flake Optimization, Orange Peel and Edge Coverage

In addition, allnex is also proud to have a speaking engagement at the show.  

Title: Modified Acrylic Polyol for Adhesion to Polyolefin Plastics

Date/Time: Thursday, May 9, 10:25-11:05am
Speaker: Dr. Gautam Haldankar, Technical Service & Business Development Manager
Abstract: The amount of plastic that is used in automobiles has gone up steadily during last two decades. Increased fuel efficiency and reduced-cost are both significant drivers for the increased use of plastic parts. Among the various types of plastics, thermoplastic olefin (TPO) is the most cost effective and hence increased use of TPO is observed in auto exterior as well as auto interior. TPO being a very low energy surface, makes it challenging for conventional coatings to adhere to this substrate. Traditionally chlorinated polyolefin resin (CPO) is applied as a separate coating step, and is used as an adhesion promoter or “tie-coat” allowing subsequent coating layers to adhere to the plastic. The CPO contains non-polar (olefin) and polar domains (typically chlorine or anhydride moieties) which serve as anchoring groups for adhesion to both the plastic itself and subsequent coating layers. Alternatively, flame or corona treatment is done to the TPO surface adding needed polarity allowing adhesion for the subsequent coating layers.  The CPO “tie-coat” and flame / corona treatment are separate steps that must be done to allow conventional coatings to adhere to TPO.

To avoid these extra steps in the plastic coating process, acrylic resin is blended with CPO resin which can then be applied directly to TPO. This offers cost savings due to step elimination (time and material) but with some drawbacks. The storage stability of the acrylic / CPO blend is short owing to the highly disparate polarities of the CPO (highly apolar olefin domains) and the acrylic resin which has medium polarity. This causes the two polymers to phase separate in the space of only a few days resulting in the poor storage stability. In addition, the preferred solvents for CPO are toluene and xylene, which are both HAPs solvents and Prop 65 listed.

To improve stability and eliminate HAPs solvents, a Next-Generation CPO-Acrylic was developed. This new system gives more balanced polarity and improved interaction between the two phases allowing the storage stability of the resin and paint to be enhanced substantially.  Additionally, the need for HAPs solvents like toluene and xylene have been eliminated to make it more environmental friendly. The data generated shows that the adhesive properties to TPO with this Next-Generation system are superior. The Next-Generation CPO-Acrylic contains hydroxyl functionality allowing the formulation of 2K coatings.  We demonstrate here the use of this Next-Gen product in both 1K and 2K coating systems both showing good adhesion to TPO and 2K formulation giving improved chemical resistance even with relatively low crosslink density.

Join us at FOCUS – we look forward to seeing you there!