Epoxy resin curing agent and preparation method thereof

Abstract

The invention discloses epoxy resin curing agent and a preparation method thereof. The epoxy resin curing agent comprises the following components in percentage by mass: 40 to 50 percent of phenylcarbinol, 30 to 45 percent of isophorone diamine, 10 to 20 percent of epoxy resin, 0.1 to 1 percent of anti-scratch wax, and 1 to 5 percent of an accelerating agent. The method for preparing the epoxy resin curing agent comprises the following steps of: adding proper phenylcarbinol and isophorone diamine into a reaction kettle; uniformly stirring the phenylcarbinol and isophorone diamine, and adding the epoxy resin into the reaction kettle; stirring and heating with steam until the temperature of the reaction liquid is 60 to 75 DEG C; keeping on reaction for 2 hours, and adding the anti-scratch wax and the accelerating agent Schiff base into the reaction kettle; and uniformly dispersing, cooling and subpackaging. By the mode, the invention can provide the epoxy resin curing agent with high hardness and good weather resistance, which is excellent in self-leveling effect when being mixed with an epoxy self-leveling host, good in coating weather resistance after being cured, and high in hardness.

Description

Technical field: [0001] The invention relates to the field of epoxy resin curing agents, in particular to an epoxy resin curing agent with high hardness and good weather resistance and a preparation method thereof. Background technique: [0002] Epoxy resin is widely used in civil construction, electronic appliances, aerospace, automotive machinery and other fields, and is an important part of national production. China is currently the world's largest producer of epoxy resin, accounting for 37.1% of the world's output. However, epoxy resin is an amorphous viscous liquid, which is plastic when heated, has no obvious melting point, becomes soft and gradually melts and becomes sticky when heated, is insoluble in water, and will not harden itself, so it has almost no independent use value. Only when the curing agent reacts to form an infusible polymer with a three-dimensional network structure can it be applied. When a certain amount of curing agent is added, it will gradually...

AI Technical Summary

Problems solved by technology

[0003] Commonly used epoxy resin curing agents are divided into basic curing agents and acidic curing agents, and basic curing agents mainly include aliphatic diamines and polyamines, alicyclic amines, aromatic polyamine compounds and modified polyethers Amines and aromatic compounds as curing agents have better film hardness, but the weather resistance of the film is not good. Aliphatic polyamines have better weather resistance, but they are easy to absorb moisture and cause the film to whiten or produce oily stains; polyether amine and The epoxy main agent is cured to form a film coating that is more flexible and less hard

[0004] The currently used polyamine curing agents such as diethylenetriamine and triethylenetetramine compounds are easy to volatilize, have a strong smell, and cause great harm to the environment; aromatic amine curing agents such as m-phenylenediamine and epoxy main agent are cured to form a film Poor weather resistance, prone to yellowing, can not be used outdoors or places with strong sunlight; the coating formed by curing polyetheramine curing agent and epoxy main agent is soft, and the epoxy resin coating film is not resistant Grinding, so the use time will not be longer, and the appearance effect will be poorer after a longer use time