News Details
Amide blocking chain extender
2017-2-21 11:57:04
Amide blocking chain extender, polyurea is by isocyanate prepolymer sealing side reaction with amino compounds components generated by the polymer, the technology due to the introduction of the highly reactive amino polyether and diamine chain extension agent, the reaction speed. It is for this reason, its high reactivity makes it difficult to get smooth surface of the coating in the process of spraying effect.
Amine react with isocyanate to produce urea, reactivity, besides is influenced by the structure of isocyanate is mainly influenced by amine structure, to solve problems reactivity, research and development with low chemical activity and can guarantee the stable performance of amine chain extender, is particularly important.
Isocyanate with relative reactivity of various active hydrogen compounds with minimal amide group, this paper adopts the methods of acyl of diamine extender chain agent ethylenediamine modified, synthesis of new amide blocking chain extender diacetyl ethylenediamine.
The main drugs. Ethylenediamine EDA, analysis of pure; Pure phosphoric acid and ice acetic acid analysis
The synthesis process. In a blender, thermometer, constant pressure drop funnel and reflux condenser pipe of four flask, first add 30. 00 g ethylenediamine, and then control the temperature under 80, add down in 50 min 90 g ice acetic acid and 0. 45 g a mixture of phosphoric acid. Overtime, four bottles of white smoke, produce lots of white solid. Add 2 h after heating reflux, and control the temperature in 120.
During the reactants into yellow viscous liquid. Back end, distilled from the reaction of water, return again, total reaction time of 3 h. After the reaction, pour out of the reactants, placed a period of time after weighing, grinding, the suction filter, washing, finally in 120 under the vacuum drying to constant weight, thoroughly remove residual acetic acid, get the product.
To add a certain amount of synthetic products in the beaker, add a small amount of distilled water at the same time, with a closed electric furnace for heating, heat saturated solution preparation. Slightly cooling after hot saturated solution, adding 1% ~ 5% (based on synthetic product quality than) around the decolorizing activated carbon. After adding activated carbon, shake well, make its uniform distribution in solution, then heated slightly boiling 5 ~ 10 min.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
The product is identical to Ethancure 100 and Lonza DETDA 80, DETDA is very effective polyurethane elastomer chain extender; also be used as polyurethane and epoxy resin curing agent, epoxy resin of an antioxidant, industrial oils and lubricants . In addition, also as intermediates in organic synthesis.Especially for the RIM (reaction injection molding), is important in the field of spray polyurea chain extender species. Also can be used for casting polyurethane elastomer (CPU) and a curing agent, epoxy curing agent, epoxy resin of antioxidants, lubricants and industrial oils other antioxidants.
The cloth's vacuum suction filter funnel, prior to the suction filter buchner funnel preheating, wet filter paper with a small amount of solvent. After being close to the filter paper into hot to filtrate, with very little hot solvent washing conical flask and activated carbon, etc. Let stand after incorporating the above smoke filtrate and washing liquid, natural cooling, crystalline precipitate slowly. A cloth's funnel to suction filtration of the mother liquor, and a small amount of solvent to washing of the crystal in the buchner funnel, finally will be dry crystal.
As is known to all, the isocyanate in the products, the activity of TDI is low, its NH2, - OH class product can be with the () to control the reaction speed of crosslinking, usually choose MOCA, 1, 4 - or BD, TMP is common. And more active in MDI, PPDI, NDI system, the industry is the need to select compounds containing - OH. This also has, the so-called "TDI/MOCA" series and "MDI/HQEE (or other compounds containing - OH) series.
HQEE and its ehrs as TDI (or is it to the polymers) crosslinking agent, is PU elastomer products in the industry, and have the patent. MDI/HQEE (or other compounds containing - OH) series, the adopted HQEE or its ehrs as crosslinking agent, PU elastomer was prepared by, its tensile strength, hardness, heat resistance and the related dynamic performance, etc., are compared with similar products (TDI, MDI) system as well.
Polyurethane elastomer because of its structural features, which has high strength, good elasticity, using a wide range of hardness and excellent wear resistance and low temperature performance, therefore they are widely used in machinery, coal, automobile, textile and other fields.
Polyurethane elastomers according to their processing methods can be classified as pouring, thermoplastic and mixed type three categories, and molded elastomer is the current domestic manufacturers, most products, most species yield larger polyurethane elastomer. Commonly used system of type casting polyurethane elastomer are mainly TDI and MDI system two kinds big.
TDI system generally with aromatic diamine extender chain agent (MOCA and DMTDA) elastomer was, MDI system commonly used alcohol chain extender (BDO and HQEE) elastomer is generated. In the process of production, TDI, MOCA toxicity is larger, the generated products and chlorine element, so this kind of elastomer is limited by some areas and some use in the field of, instead of the system of MDI polyurethane products.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Amine react with isocyanate to produce urea, reactivity, besides is influenced by the structure of isocyanate is mainly influenced by amine structure, to solve problems reactivity, research and development with low chemical activity and can guarantee the stable performance of amine chain extender, is particularly important.
Isocyanate with relative reactivity of various active hydrogen compounds with minimal amide group, this paper adopts the methods of acyl of diamine extender chain agent ethylenediamine modified, synthesis of new amide blocking chain extender diacetyl ethylenediamine.
The main drugs. Ethylenediamine EDA, analysis of pure; Pure phosphoric acid and ice acetic acid analysis
The synthesis process. In a blender, thermometer, constant pressure drop funnel and reflux condenser pipe of four flask, first add 30. 00 g ethylenediamine, and then control the temperature under 80, add down in 50 min 90 g ice acetic acid and 0. 45 g a mixture of phosphoric acid. Overtime, four bottles of white smoke, produce lots of white solid. Add 2 h after heating reflux, and control the temperature in 120.
During the reactants into yellow viscous liquid. Back end, distilled from the reaction of water, return again, total reaction time of 3 h. After the reaction, pour out of the reactants, placed a period of time after weighing, grinding, the suction filter, washing, finally in 120 under the vacuum drying to constant weight, thoroughly remove residual acetic acid, get the product.
To add a certain amount of synthetic products in the beaker, add a small amount of distilled water at the same time, with a closed electric furnace for heating, heat saturated solution preparation. Slightly cooling after hot saturated solution, adding 1% ~ 5% (based on synthetic product quality than) around the decolorizing activated carbon. After adding activated carbon, shake well, make its uniform distribution in solution, then heated slightly boiling 5 ~ 10 min.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
The product is identical to Ethancure 100 and Lonza DETDA 80, DETDA is very effective polyurethane elastomer chain extender; also be used as polyurethane and epoxy resin curing agent, epoxy resin of an antioxidant, industrial oils and lubricants . In addition, also as intermediates in organic synthesis.Especially for the RIM (reaction injection molding), is important in the field of spray polyurea chain extender species. Also can be used for casting polyurethane elastomer (CPU) and a curing agent, epoxy curing agent, epoxy resin of antioxidants, lubricants and industrial oils other antioxidants.
The cloth's vacuum suction filter funnel, prior to the suction filter buchner funnel preheating, wet filter paper with a small amount of solvent. After being close to the filter paper into hot to filtrate, with very little hot solvent washing conical flask and activated carbon, etc. Let stand after incorporating the above smoke filtrate and washing liquid, natural cooling, crystalline precipitate slowly. A cloth's funnel to suction filtration of the mother liquor, and a small amount of solvent to washing of the crystal in the buchner funnel, finally will be dry crystal.
As is known to all, the isocyanate in the products, the activity of TDI is low, its NH2, - OH class product can be with the () to control the reaction speed of crosslinking, usually choose MOCA, 1, 4 - or BD, TMP is common. And more active in MDI, PPDI, NDI system, the industry is the need to select compounds containing - OH. This also has, the so-called "TDI/MOCA" series and "MDI/HQEE (or other compounds containing - OH) series.
HQEE and its ehrs as TDI (or is it to the polymers) crosslinking agent, is PU elastomer products in the industry, and have the patent. MDI/HQEE (or other compounds containing - OH) series, the adopted HQEE or its ehrs as crosslinking agent, PU elastomer was prepared by, its tensile strength, hardness, heat resistance and the related dynamic performance, etc., are compared with similar products (TDI, MDI) system as well.
Polyurethane elastomer because of its structural features, which has high strength, good elasticity, using a wide range of hardness and excellent wear resistance and low temperature performance, therefore they are widely used in machinery, coal, automobile, textile and other fields.
Polyurethane elastomers according to their processing methods can be classified as pouring, thermoplastic and mixed type three categories, and molded elastomer is the current domestic manufacturers, most products, most species yield larger polyurethane elastomer. Commonly used system of type casting polyurethane elastomer are mainly TDI and MDI system two kinds big.
TDI system generally with aromatic diamine extender chain agent (MOCA and DMTDA) elastomer was, MDI system commonly used alcohol chain extender (BDO and HQEE) elastomer is generated. In the process of production, TDI, MOCA toxicity is larger, the generated products and chlorine element, so this kind of elastomer is limited by some areas and some use in the field of, instead of the system of MDI polyurethane products.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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