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    Home > Coatings News > Paints and Coatings Market > Coating knowledge: Decoration master shares the description of epoxy resin curing agent

    Coating knowledge: Decoration master shares the description of epoxy resin curing agent

    • Last Update: 2020-04-03
    • Source: Internet
    • Author: User
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    Core tips: a variety of brands of epoxy curing agent will have their own characteristics, understand the description of epoxy curing agent, can make better use of these curing agents Generally, epoxy curing agents have their own brand names Of course, due to trade secrets and other reasons, manufacturers usually keep these brand names secret Senior decoration master will share the basic structure of some epoxy curing agents with you today D-8 ketoaldehyde epoxy compound and aliphatic polyamine adduct, low viscosity, moderate curing speed, coating application period factory The coating is convenient, and the formed coating has good corrosion resistance, but the color is darker T - 31 change Shenyang steel structure fireproof coating construction expert punde Building Fire Engineering Co., Ltd Recommended introduction: since its establishment, Shenyang punde Construction Fire Engineering Co., Ltd has cultivated a group of professional construction teams with excellent equipment, rich experience and serious responsibility with advanced and scientific management methods and strict engineering quality assurance and after-sales service system It has undertaken a number of fire system installation projects, which has been praised by customers Every idea and special requirement of you will be fully considered by us and fully realized in the construction technology, which will become the cornerstone of our successful long-term development We are looking forward to your invitation, to provide you with quality services and high-quality technical support! All construction coatings have passed ISO9001 Paint Home News: all kinds of brands of epoxy curing agents have their own characteristics Understanding the description of epoxy curing agents can make better use of these curing agents Generally, epoxy curing agents have their own brand names Of course, due to trade secrets and other reasons, manufacturers usually keep these brand names secret Senior decoration master will share the basic structure of some epoxy curing agents with you today D-8 ketoaldehyde epoxy compound and aliphatic polyamine adduct, low viscosity, moderate curing speed, coating application period factory The coating is convenient, and the formed coating has good corrosion resistance, but the color is darker T-31 modified amino phenol formaldehyde amine adduct has the advantages of high viscosity, fast curing speed and underwater curing But the coating is brittle 591 ා diethylenetriamine acrylonitrile copolymer (B Cyanoethylation), light yellow liquid, low toxicity, low heat release, long service life, need heating curing, curing conditions: 80 ℃, 12h; dosage 20-25% Gy-051 condensed amine light brown liquid, dosage 12-14%, curing conditions: room temperature, 48 hours 590 m-phenylenediamine and epoxyphenylphenyl ether condensate brown black liquid, softening point below 20 ℃, dosage of 15-20%, can be cured at room temperature 701 phenol formaldehyde hexanediamine condensate 25-35%, room temperature curing 4-8h The amount of 702 phenol formaldehyde m-phenylenediamine condensate is 23-35%, and it is cured at room temperature for 4-8h The amount of 703 × phenol formaldehyde ethylenediamine condensate was 36-42% and cured at room temperature for 4-8h 706 × curing agent: triisopropanol titanate brown liquid, 20-30%, curing: 100 ℃, 1 h; 142 ℃, 2 h 120 × ethylenediamine and diethylenetriamine react with ethylene oxide in the presence of a small amount of water The volatility and toxicity of viscous liquid are more than 10003 times less than that of ethylenediamine The adduct of 16-18% 593 diethylenetriamine and butyl glycidyl ether with viscosity of 0.2 Pa.s at 25 ℃ curable quickly at room temperature has high activity and low toxicity The epoxy resin cured rapidly at room temperature has good flexibility The dosage is 23-25%, the exothermic reaction with epoxy resin is mild, and the service life is about 1 hour 70 ා anhydrides are synthesized from butadiene and maleic anhydride with low toxicity and volatility The dosage is 70-80% The curing condition is 150 ℃, 4H Liquid anhydrides produced in Tianjin Jindong chemical plant Light yellow liquid, low viscosity 647 MAH is synthesized from dicyclopentadiene and maleic anhydride The dosage of light yellow liquid is 80-90% Curing conditions: 150-160 ℃, 8h Tianjin Jindong chemical factory 308 maleic anhydride modified by tung oil The dosage is 100-200% The cured product is soft, has good elongation and poor heat resistance Curing conditions: 100-120 ℃, 6-10h The room temperature of 704 ා 2-methylimidazole and propylene oxide butyl ether adduct is brown red viscous liquid, the epoxy resin is cured rapidly at 80-120 ℃, the adduct of 10% 705 ා 2-methylimidazole and propylene oxide isooctyl ether is brown red viscous liquid at room temperature, the epoxy resin is cured rapidly at 80-120 ℃, and the amount of 15% epoxy resin curing agent is determined 1 Calculation of the amount of amine curing agent The calculation method of the amount of amine curing agent is based on the interaction of an active hydrogen and an epoxy group on the amino group The amount of various primary amines and secondary amines is calculated as follows: w = (M / HN) × e formula: W - mass of amine curing agent required for each 100g of epoxy resin, G; m - molecular weight of amine curing agent; HN - number of active hydrogen atom on amine group in curing agent molecule; e - epoxy value of epoxy resin For example: use ethylenediamine as curing agent to cure E-44 epoxy resin, and calculate the amount of ethylenediamine required for each loog epoxy resin Solution: the molecular formula of ethylenediamine is h2n-ch2-nh2, the molecular weight of ethylenediamine is m = 60, the active hydrogen atom number of ethylenediamine is HN = 4, the epoxy value of E-44 epoxy resin is e = 0.40 ~ 0.47, then Wmax = 60 / 4 × 0.47 = 7.05 (g), wmin = 60 / 4 × 0.40 = 6 (g), that is, 6 ~ 7g ethylenediamine curing agent is needed for every 100g E-44 epoxy resin In fact, with the size of amine molecules, reaction capacity and volatilization, it is generally more than 10% more than the theoretical value 2 Calculation of the amount of anhydrides curing agent the amount of anhydrides curing agent is usually calculated by the following formula: w = AE · e · K formula: W - the mass of anhydrides curing agent required for every 100g of epoxy resin, G; Hall of fame: celebrities take you to feel their driving life Ma Yun, Ren Zhiqiang, Li Jiacheng, Liu Chuanzhi, Shi Yuzhu, AE - the molar mass of anhydrides, kg / mol; K -- amount of anhydride required per mole of epoxy group, mol Empirical data, which varies from 0.5 to 1.1, is generally 0.85 For example: for 100g epoxy resin with epoxy value of 0.43, if PA is used as its hardener, how much is appropriate? Solution: the molecular formula of PA is: its molecular weight M = 148 e = 0.43, empirical value k = 0.85, so the appropriate dosage is: w = 148 × 0.43 × 0.85 × 54.1 (g) That is to say, 100g epoxy resin with epoxy value of 0.43 and 54G phthalic anhydride are suitable as curing agent The actual usage is also higher than the theoretical calculation There are two reasons why the amount of curing agent is generally higher than the theoretical calculation value: first, there will be volatilization loss in the process of preparation and operation; second, it is not easy to mix evenly with resin However, when the amount of hardener is too large, it will cause the resin chain to stop growing, reduce the molecular weight of the hardener, and make the cured resin brittle The above calculated values refer to the pure curing agent, i.e 100% content When the purity is not reached, conversion adjustment shall be carried out The above content is the main content of epoxy resin curing agent shared by decoration master and you today Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,
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