Recently, a professional calculation guide for epoxy resin curing agent dosage was officially released, providing scientific proportioning basis for manufacturers in chemical, building materials and other fields, and effectively solving product quality problems caused by improper curing agent dosage. The guide details the calculation logic of two mainstream curing agents: amine-based and anhydride-based, filling the gap of practical guidance in the industry. The guide clarifies that the dosage calculation of amine-based curing agents is based on the reaction between active hydrogen of amino groups and epoxy groups, using the formula W＝(M/ Hn)×E. It is necessary to accurately obtain three key parameters: curing agent molecular weight, number of active hydrogen atoms and epoxy resin epoxy value. Taking ethylenediamine curing E-44 epoxy resin as an example, the calculation shows that 6~7g of curing agent is required per 100g of resin, and the actual dosage needs to be increased by more than 10% to make up for volatilization loss. For anhydride-based curing agents, the guide provides the formula W＝A E·E·K, with K value taking the industry empirical data of 0.85. Taking epoxy resin with an epoxy value of 0.43 combined with phthalic anhydride as an example, the theoretical calculated dosage is about 54g per 100g of resin. Experts specially remind that the actual dosage of curing agent needs to be higher than the theoretical value, but excessive dosage will cause the resin to become brittle, so the range must be strictly controlled. It is reported that the deviation of curing agent dosage is a key factor affecting the strength and toughness of epoxy resin products. The release of this guide will help enterprises reduce the cost of proportioning trial and error and improve production efficiency. The guide also emphasizes that the calculation is based on the pure curing agent standard, and the actual dosage needs to be converted and adjusted according to the purity. At present, this calculation method has been pilot applied in many chemical enterprises, and the product qualification rate has increased by more than 15% compared with before, providing technical support for the high-quality development of the industry.
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