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The latent epoxy coating crosslinking agent
2017-8-6 21:10:27
The latent epoxy coating crosslinking agent
Different kinds of latent epoxies are introduced according to the conditions of crosslinking, and the typical representative and properties of various latent epoxy-crosslinking agents are listed.
The so-called latent epoxy crosslinking agent is it cooperate with epoxy resin, have certain storage stability at room temperature, and in the heat, light, moisture and pressure conditions can quickly make epoxy cross-linking cross-linking cross-linking agent.
Compared with two-component epoxy resin system, sexual intercourse by the latent agent made from mixed with epoxy resin of one-component system, without the ingredients, simplifies the production and use process, help to prevent environmental pollution, improve product quality and automation production line, is epoxy crosslinking agent at home and abroad in recent years the focus of the research and development project.
Progress in the research of the latent agent of epoxy resin. Modified aliphatic amines, aromatic diamine, dicyandiamide, imidazoles, organic acid, organic hydrazide, lewis acid - amine complex compound and microcapsule type latent epoxy resin sexual coupling agent.
Epoxy resin is a kind of good adhesion, electrical insulation, chemical stability, thermosetting polymer materials, as adhesives, coatings and resin matrix composite materials, etc, are widely used in construction, machinery, electrical and electronic, aerospace and other fields. Epoxy crosslinking agent must be added when using, and carries on the crosslinking reaction under certain conditions, to generate the product of the three-dimensional network structure, will appear a variety of excellent performance, an epoxy material has actually use value.
Therefore crosslinking agent is indispensable in the application of epoxy resin and even plays a decisive role to some extent. Epoxy resin-potential coupler is a hot topic in the research of epoxy resin crosslinking agent at home and abroad in recent years.
Chinese name: Diethyl toluene diamine(DETDA)Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
Latent sexual intercourse agent, refers to the join the epoxy resin and its composition of one-component system have certain storage stability at room temperature, and in the heat, light, humidity, pressure and other conditions can quickly on the crosslinking reaction of the crosslinking agent, and compared the current widely used system of two-component epoxy resin, sexual intercourse by the latent agent made from mixed with epoxy resin of one-component epoxy resin system has simplified the operation process, to prevent the pollution of the environment, improve product quality, adapt to the modern large-scale industrialized production, etc.
Epoxy resin is an organic compound that contains two or more epoxies in the molecule, and their relative molecular weight is not high except for the individual. Because of the active epoxy groups in the molecular structure, they can be cross-linked with multiple types of crosslinking agents to form an insoluble polymer with three - to - mesh structures. The polymer compounds containing epoxids in the molecular structure are collectively referred to as epoxies. Latent sexual intercourse agent of epoxy resin research generally by physical and chemical means, the common use of low temperature and high temperature of crosslinker crosslinked activity is improved, mainly take the following two improved methods: one is to some high reactivity and the storage stability of crosslinking agent are closed, the reactivity of passivation; The second is to improve the reaction activity of the crosslinking agent with good storage stability and low reaction activity.
Eventually reach the crosslinking agent added to the epoxy resin at room temperature have certain storage stability, when in use by external conditions, such as light, heat will release activity of crosslinking agent, so as to achieve the aim of making quick crosslinked epoxy resin. This paper presents a basic overview of the research progress of epoxy resins.
Although there are many different kinds of epoxy resins, the crosslinking agent has its advantages and disadvantages, and it is difficult to be perfect. At present, the research on the latent agent of epoxy resin is mainly focused on dicyandiamide, mimidazol-type and aromatic diamine crosslinking agent.
In the future, the focus of the research on the development of epoxy resins is to solve the problem of water resistance, heat resistance and heat resistance of crosslinking products, so as to achieve the similar performance of the high-temperature crosslinking system. Secondly, how to further reduce the crosslinking temperature, shorten the time of crosslinking, and improve the efficiency and energy saving as much as possible. With the improvement of people's awareness of environmental protection, the research of low-toxicity and non-toxic environment-friendly epoxy resins is inevitable trend.
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