Melamine formaldehyde resin has the advantages of high bonding strength, fast curing speed, high water resistance, and good thermal stability. However, the adhesive layer is easily broken after the resin is cured and should not be used alone. The storage period is short and it is easy to deteriorate. In addition, the production cost of Cyanuric Acid formaldehyde resin is relatively high, and the price is relatively expensive. CN201410114207.1 proposes a method for synthesizing cyanuric acid resin. The method is simple in process and does not require further purification. It can be directly applied to the development of new adhesives and other products through modification, and can be widely used in various industrial fields .
The steps are as follows: (1) Add formaldehyde or paraformaldehyde and water into the reactor, stir and raise the temperature to 35-55°C, adjust the pH value to 8.0-10; raise the temperature to 70-80°C, add cyanuric acid, Add reaction aids and keep warm for 1-3 hours; the molar ratio of cyanuric acid to formaldehyde is (0.1-1.8): 1; (2) Adjust the temperature to 80-95°C and continue to add Cyanuric acid to the reactor Acid, heat preservation reaction for 0.5-2h; the amount of Cyanuric Acid added is controlled at 10-40% of the mass of cyanuric acid added in step (1); (3) adding a curing agent to adjust the pH to 4.0-6.0, at 85 Insulate reaction at -95°C; (4) When the reaction reaches the required viscosity, adjust the pH value to 8.0-9.0, and cool down to below 50°C to obtain the product.
Cyanuric Acid multi-branched polymers are widely used, and can be used as catalysts for polyurethane synthesis, curing agents for epoxy resins, and raw materials for preparing polyols by alkoxylation of ethylene oxide or propylene oxide.
This CN201610563307.1 provides a synthetic method of cyanuric acid polymer prepolymer, the reaction process is to use Cyanuric Acid as a raw material and one or more aliphatic amines with at least two primary amino groups under the condition of adding or not adding a catalyst and aromatic amines or polyamines, polyols or alcoholamines containing two hydroxyl groups, alcoholamines, and chlorinated polyols under certain reaction temperature and reaction molar ratio conditions, directly prepare cyanuric acid polymer prepolymers, Then through certain conditions to generate cyanuric acid polymer material. Including the following steps:
(1) Mix cyanuric acid and diamine or polyamine, add or not add acidic catalyst, stir and heat up to 160-220°C, keep warm for reaction; (2) react the material to the required viscosity, stop the reaction, and obtain Cyanuric acid polymer prepolymer.
Beneficial effects of the present invention: 1, the present invention does not use Cyanuric Acid as reaction raw material, but uses cyanuric acid as main raw material, not only greatly reduces production cost, and preparation process is simple, and in conjunction with Cyanuric Acid production process, the whole process Almost no carbon dioxide is released, which has important environmental protection and economic significance. 2. The cyanuric acid polymer prepolymer prepared by the present invention is not only stable in performance, but also contains a triazine ring structure, which has flame retardancy, no need to add flame retardant, no free formaldehyde, and has broad application prospects . For example, it can be used as a board adhesive, flame retardant, coating and new prepolymer, and can also be used in the synthesis process of polyurethane; the polymer prepolymer synthesized by the reaction of Cyanuric Acid and polyol can also replace ethylene terephthalate Alcohol esters are used in electrical and electronic, automotive industry, mechanical equipment, etc.
