Halogen-free flame retardant and preparation method thereof

Abstract

The invention relates to a halogen-free flame retardant and a preparation method thereof. The flame retardant is formed by combining one or two of the following three organic hypophosphite compounds containing triazine ring structures at any mass ratio. The preparation method of the halogen-free flame retardant comprises the following steps of adding triglycidyl isocyanurate and hypophosphite into a reaction vessel, taking ethanol, ethylene glycol or glacial acetic acid as a solvent, heating slowly and maintaining a reaction, conducting suction filtration, washing and drying after the reaction is finished, and obtaining the halogen-free flame retardant. The halogen-free flame retardant is prepared by taking hypophosphite and triglycidyl isocyanurate (TGIC) as main raw materials, and has the characteristics that the raw materials are easy to obtain, a process is simple and easy to run, and the production and the operation are safe. The prepared halogen-free flame retardant and a composition are good in thermostability and excellent in comprehensive property; various colors can be blended; the halogen-free flame retardant and the composition can be applied to flame retarding PBT (polybutylece terephthalate) engineering plastics, PA6 (polyamide6) or PET(polyethylene terephthalate) and the like, and are good in application prospect.

Description

Technical field [0001] The invention relates to a halogen-free flame retardant and a preparation method thereof, in particular to a halogen-free flame retardant of an organic phosphinate containing a triazine ring structure and a preparation method thereof. Background technique [0002] In recent years, the application of reinforced flame-retardant engineering plastic materials in electronic appliances and other industrial fields has increased. Its performance characteristics include: fast molding speed, excellent electrical properties, good chemical resistance, and high mechanical strength. Market application prospects. However, traditional flame-retardant reinforced engineering plastic materials all use bromine-based flame-retardant systems. The high amount of smoke and the release of toxic gases during combustion make them face increasingly stringent environmental and safety requirements. [0003] Since the two directives of WEEE and RoHS were successively issued, countries hav...

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Problems solved by technology

However, the traditional flame-retardant reinforced engineering plastic materials all use bromine-based flame-retardant systems, which cause high smoke generation and release of toxic gases during combustion, making them face increasingly stringent environmental protection and safety requirements.

[0003] Since the two directives of WEEE and RoHS were issued successively, countries have increased the development of halogen-free flame retardants, but halogen-free intumescent flame retardants still face many shortcomings, and the addition amount is still too high, and the compatibility with materials The precipitation problem caused by the poor still plagues the academic circles today

[0004] At present, the halogen-free reinforced flame-retardant engineering plastic materials are mainly red phosphorus flame-retardant materials. The biggest problem with red phosphorus flame-retardant engineering plastic materials is the color of the product, so that it can only be made into red or black parts, especially when the parts require light colors. Even when it is white, the red phosphorus flame-retardant reinforced engineering plastic material is powerless; and the red phosphorus flame-retardant reinforced engineering plastic is prone to spontaneous combustion of red phosphorus during the extrusion process, resulting in a large waste of raw materials; moreover, red phosphorus Flame retardants tend to release very toxic pH under oxidative conditions 3 Gas is a huge safety hazard to production workers and even consumers. Therefore, the market's call for halogen-free, red-phosphorus-free flame-retardant reinforced engineering plastic materials is even more urgent

[0005] At present, since Clariant launched the OP series of flame retardants, the flame retardants have made great progress in glass fiber reinforced nylon and polyester, but the high price of flame retardants makes the cost of halogen-free flame-retardant PBT materials High, which greatly limits the market promotion of halogen-free flame retardant reinforced engineering plastics

Moreover, OP series flame retardants also face the disadvantages of obvious loss of mechanical properties. In the competition with brominated flame retardant reinforced engineering plastic materials, if there is no mandatory promotion by laws and regulations, they will be completely at a disadvantage.

[0006] Recently, many companies and scholars have devoted themselves to the development of halogen-free flame retardants for glass fiber reinforced engineering plastics. There are two major problems in the flame retardants or flame retardant systems reported in many patents and literatures: first, the heat of flame retardants The stability is not high, and the flame retardant begins to decompose during extrusion processing, resulting in foaming and brittle extruded strips, and even spontaneous combustion; second, the mechanical properties of flame-retardant products are seriously lost, and many halogen-free flame-retardant The high dosage of additives leads to a considerable decrease in the rigidity and toughness of flame-retardant engineering plastic materials, which cannot meet the requirements of injection molded parts, and the application is even more out of the question.

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