Synthesis Of Derivatives Of Cyclotriphosphazene And Its Flame Retardant Application In Acrylate Resin

Acrylic resin is a kind of important resin material which possesses good properties. For example, it has outstanding physical and mechanical performance, water tolerance, weathering resistance, fatigue resistance and low cost. Hence, it’s widely used in engineering materials, electronics, electrical appliances, optical instrument, coatings, adhesives, etc. However, the flammability of acrylic resin which results in fire disaster limits its functional applications in some special fields. Therefore, many researchers have focused on improving the flame retardant of acrylic resin. Cyclotriphosphazene as a new kind of organic and inorganic hybrid material, is formed by alternating phosphorus and nitrogen atoms connected closed circular compound. It possesses outstanding flame-retardant abilities for its high content and synergetic flame-retardant abilities of nitrogen and phosphorus. Additionally, it doesn’t produce poisonous gas when burning.Cyclotriphosphazene can be distributed into additive type and reactive type according to substituent group. Additive type is widely used all kinds of polymer materials because of its convenience to use and excellent fire retardant efficiency. Hexaphenoxycyclotriphosphazene (HPCP) is synthesized by using hexachlorocyclotriphosphazene (HCCP), phenol and sodium hydride as raw materials. The product is characterized by FT-IR,’H-NMR,13C-NMR,31P-NMR, DSC, TGA. HPCP is applied in acrylicresin as fire retardant and the influence of HPCP’s content on thermal and fire retardant properties is investigaged. It turns out that when the addition of 20 mass% HPCP, the acrylic resin could reach UL-94 V-0 classification and its limiting oxygen index (LOI) value is increased from 17.5 to 32.2, and the residual mass up to 18.95% in air at 700℃, Mean HRR and THR are reduced to 43 kW/m2 and 42 MJ/m2, respectively.Additive flame retardant is easy to migrate and separate out in the matrix materials, resulting in the reduction of fire retardant abilities. Furthermore, additive flire retardant can’t compatible with polymer completely and influences physical performance of compound. So 2-allyl phenoxy-pentaphenoxycyclotriphosphazene (APPCP), as a novel reactive flame retardant, is synthesized by using HCCP, phenol, sodium hydride and 2-allyl phenoxy. The material obtained is characterized by FT-IR, 1H-NMR, TGA methords. APPCP is applied in acrylate resin as flame retardant and the effect of APPCP’s content on the thermal and flame-retardant properties is investigaged. It turns out that when the addition of 20 mass% APPCP, the acrylate resin could reach UL-94 V-0 classification and LOI value is increased from 17.5 to 34.5, and the residual mass up to 21.35% in air at 700℃, THR and TSR are reduced to 34 MJ/m2 and 585 m2/m2, respectively.This paper also discusses the method to improve the damping property of acrylic resin. Styrene-acrylic emulsion copolymer which side chains containing urea aldehyde group is prepared by using butyl acrylate (BA), styrene (St), methacrylic acid urea formaldehyde ethyl ester (MAAUFEE) as raw materials. Waterborne damping coatings are obtained by selecting styrene-acrylic emulsion as basic material mixed with filler, deionized water and additives. Styrene-acrylic emulsion copolymer is characterized by fourier transform infrared spectroscopy (FT-IR) and it’s proved that MAAUFEE has been accessed to the molecular chain. Waterborne damping coatings are tested by dynamic mechanical analysis (DMA). It turned out that emulsion copolymer can achieve the best performance when the molar ratio of St, BA and MAAUFEE is 86:86: 1. On that basis, adding 5.0wt% dioctyl phthalate and 10.0 wt% mica powder, coatings can reach the highest loss tangent 1.25.