PRIMID HARDENER DY-552

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1. Property: Appearance: white or pale powder Volatile: ≤ 1.5% OH-Equi.: 82± 2g/eg Melting range: 124-129° C (by GB9284) 2. Application: DY-552 is a curing agent suitable for the production of outdoor-used polyester coatings. It has the characteristics of low toxicity, no irritant to skin and good weather durability. Thus it is a good alternative of TGIC. The chemical structure of DY-552 is ¨¡-hydroyxyalklamide. DY-552 can be cured with carboxylic polyester. The acid value ranges form 25-45 mgkOH/g. In order to minimize the yellowing, the appropriate resin should be preferred in formulation. A certain amount of a degassing additive is, however, generally recommended to prevent micro-pinholes due to the production of water in the cross-linking reaction. Typically cure schedules are required to develop full coating properties ranging from 5min at 200° C to 20min at 150° C, generally, 15min at 180° C is preferred. The reference formulation is shown in the following: PE: 600g DY-552 (Dongyuan): 3.1g DY-88 (Dongyuan): 10g BENZOE (Dongyuan): 4g R902 (TiO2, Dupont): 350g 3. Material: 1) PE: AV 35mgKOH/g, such as P955 (DSM); CC7630 (UCB); P9337T (Sino-French) 2) DY-88: leveling agent, polyacrylate with silica carrier 3) Machine: PLK46 (Buss). The extruding temperature: 110-120°C 4) Baking condition: 180/15min 5) Film thickness: 50-100μm 4. Storage: Keep ventilative and dry in normal temperature Prevent direct sunshine Keep it far away from hot and fire substance Use dustproof respirator and gloves for protection in operation Packing: Packaged in multi-ply paper bags N.W.: 25kg/bag The information herein is to the best of knowledge. As the using conditions are not under our control, no guarantees are given. For liability on our side, we refer to general standard items and conditions printed in the brochure.

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ZHAO QING DONG YUAN CHEMICAL CO.,LTD.

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