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    Home > Coatings News > Paints and Coatings Market > Oily polyamine modified epoxy influence factor geometry

    Oily polyamine modified epoxy influence factor geometry

    • Last Update: 2021-01-06
    • Source: Internet
    • Author: User
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    epoxy resin has the characteristics of good adhesion, corrosion resistance, high strength and convenient processing, and is widely used. Usually with amines or anhydrides as curing agents, but its curing material brittleness, low impact resistance, easy cracking and other shortcomings hinder its application, it is necessary to strengthen epoxy resin. According to
    China Coatings Onlineexperts
    , the current epoxy resin toughening is mainly in epoxy resin formulation, add a certain amount of epoxy resin or curing agent can react with the active toughener; The early toughening of epoxy resins started with plasticizers and softeners. This method usually reduces the heat resistance, hardness, modality, dielecy of the material. Long-chain fattyamides are used as corrosion inhibitors, fabric finishing agents, lubricants and surfactants. A mixture of fatty acids and polyamine-generated amides is mixed with the epoxy-amine system, with a view to using the flexibility of the long fat chain and the active hydrogen of acetamide, which can react with the epoxy base to prepare epoxy resins with certain toughness. Recently, Hubei University School of Materials Science and Engineering, in a study using lysic acid and polyamine in a certain condition direct reaction to produce aamide-like substances, it is mixed with epoxy resin pre-reaction, so that the long chain in the form of chemical bonds connected to the epoxy resin network, thus better improve the normal temperature curing epoxy-amine curing system impact resistance, improve its toughness.
    does oily polyamine affect the performance of epoxy curing? The researchers first analyzed the characteristics of oily polyamine, and then examined the effects of oily polyamine dosing on the curing process. With the increase of the amount of oily polyamine, the gel time of epoxy-amine gradually increased, and the system viscosity was observed to be smaller in the experiment, which was caused by the isolation and dilution of the long fat chain caused by the dispersion of the additive oily polyamine in the epoxy-amine system. The effect of oily polyamine dosage on the impact strength of curing material can be seen from the relevant experimental diagram, the dosage of oily polyamine has a significant effect on the impact strength of curing material: in a certain range with the increase of oily polyamine dosage, the impact intensity has been significantly increased, at about 10% to achieve the best. However, as the dosing of oily polyamine continues to increase, the impact intensity begins to decrease, increasing to 20%, and the impact intensity decreases significantly. It is possible that too many oily polyamine additives greatly reduce the curing degree of the curing substance, and the heat resistance of the curing substance is also seriously reduced. Effect of oily polyamine dosing on the hardness of curing materials? The addition of oily polyamines did not change much in the hardness of the curing substance, but decreased slightly; With regard to the effect of oily polyamine dosing on the heat resistance of curing, the experiment shows that the addition of oily polyamine reduces the thermal deformation temperature of the curing body, possibly due to the formation of a sealing end between oily polyamine and part epoxy resin reaction, thus reducing the curing degree.
    Has never added and added 10% oily polyamine epoxy resin curing the thermal weight curve, it is better to know: the addition of oily polyamine increased the corresponding characteristic temperature of epoxy resin curing, speed up the thermal decomposition speed of epoxy resin curing, reduce the weight loss of curing residue. The experimental results show that adding oily polyamine can make the structure of epoxy resin curing material dense, which is beneficial to resist the influence of heat on the structure of resin skeleton (which coincides with the toughening effect), while the decrease of resin curing cross-chaining makes the resin curing material break down quickly at higher temperatures. In short, adding a certain amount of oily polyamine has little effect on the thermal stability of epoxy resin. In this study, the School of Materials Science and Engineering of Hubei University synthesized the epoxy resin toughener oily polyamine from ionic acid and triethylene tetamine, and studied the structure of oily polyamine and its effect on the curing properties of ethyl polyamine. The structure of oily polyamine was indicated by infrared spectroscopy, and the effect of oily polyamine on the impact resistance of oily polyamine was studied by the simple branch beam impact experimenter, and the change of the thermal stability of curing material was studied by using thermal deformer and thermal weight analyzer. The results show that the appropriate amount of oily polyamine can improve the impact resistance strength of the curing, the hardness of the curing material is not changed much, so that the temperature of thermal deformation is slightly reduced, so that the starting decomposition temperature is slightly higher. This is worthy of affirmation, especially the experiment of oily polyamine to extend the gel time of epoxy-amine, and the conclusion that the appropriate amount of oily polyamine can improve the impact resistance of the curing body, have little effect on the hardness of the curing body, and make the initial decomposition temperature of the curing slightly higher.
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