Method for purifying triglycidyl isocyanurate

Abstract

The invention relates to a method for purifying triglycidyl isocyanurate. The purification method comprises the following steps: adding a triglycidyl isocyanurate TGIC crude product into a reaction device with a distillation solvent recovery system, heating to 95-100 DEG C, and preserving heat; the method comprises the following steps: adding water into a reaction device with a solvent distillation and recovery system, heating until boiling, distilling off part of water, and dissolving a triglycidyl isocyanurate TGIC crude product in water to form a homogeneous mixed solution; cooling and separating out crystals; filtering and cleaning to obtain cleaned crystals; and drying to obtain the product. According to the purification method, the effective recovery rate of TGIC exceeds 95%; the TGIC quality is high, the epoxy equivalent is 99.5-100.6 g / mol, ECH residues, ethanol residues and methanol residues are all lower than 10 ppm, and the chlorine content is lower than 0.06%. The purification method greatly improves the antianaphylaxis and environmental protection property of the TGIC product.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular to a method for purifying triglycidyl isocyanurate. Background technique [0002] Triglycidyl isocyanurate (TGIC) is a heterocyclic polyepoxy compound with excellent heat resistance, weather resistance, light resistance, corrosion resistance, chemical resistance and mechanical properties, mainly used for carboxyl-containing The curing agent for polyester and carboxylic acrylic resin powder coatings can also be used in the manufacture of electrical insulating material laminates, printed circuits, various tools, adhesives, plastic stabilizers, etc. [0003] At present, the mainstream process for the industrial production of TGIC is a process route in which isocyanuric acid, epichlorohydrin (ECH) and caustic soda are used as raw materials. TGIC synthesized by the traditional process, considering that the product is obtained by cooling and crystallizing from methanol solvent, the resid...

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Problems solved by technology

Although this patented method can effectively avoid containing methanol in the product, the following problems still exist in this patented method: (1) due to the poor solubility of ethanol to sodium chloride salt, the chloride ion content in the TGIC product must be higher than the traditional method; (2) Since TGIC has a higher solubility in ethanol, if ethanol is used as a crystallization solvent, the yield of TGIC will inevitably decrease; (3) 48-630ppm of ECH residues still exist in the TGIC product obtained by the patented method

Although this patent method avoids the use of methanol, so that the methanol content in the product is 0, there are still the following problems: (1) directly using ECH as the crystallization solvent will inevitably increase the residual amount of ECH in the product; (2) ECH has a relatively strong dissolving ability for TGIC , part of the TGIC must be dissolved in the crystallization mother liquor, so that the yield decreases; (3) although organic bases are used as catalysts, it is impossible to completely avoid the residue of by-product sodium chloride salt

However, this method does not effectively remove methanol, and the addition of entrainer will inevitably introduce entrainer residue

In addition, the chlorine content of the TGIC product obtained by this method is still relatively high, ranging from 0.11% to 0.18%. not particularly high

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