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Preparation of Surface Coated Nano-Antimony Oxide with Melamine-Formaldehyde Resin and Study of Flame Retardant Property in Flexible PVC

Author: WangJuan
Tutor: LiZhiWei；LiXiaoHong
School: Henan University
Course: Materials Processing Engineering
Keywords: Flame retardants Antimony oxide Coated PVC Preparation Flame retardant properties
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 82
Quote: 0
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Abstract


The papers carry a melamine resin (also known as melamine-formaldehyde resin, referred to as the MF) coated nanometer antimony trioxide flame retardants and antimony pentoxide Preparation soft polyvinyl chloride (PVC), respectively, using X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FT-IR) and a variety of the modern characterization tests were characterized by means of the antimony oxide coated and uncoated. Coated front and rear of antimony trioxide and antimony pentoxide were added to soft PVC, composite thermal gravimetric analysis and oxygen index test, examine the amount of antimony oxide add the coated and uncoated soft PVC flame retardant performance and tensile strength. The main contents and results are as follows: 1. Coordination of the fluoride ions precipitate prepared antimony trioxide fluoride ion coordination prepared by precipitation of antimony trioxide, effects of ligand concentration the antimony ion concentration, temperature, the molecular weight of the modifier other polymorph of antimony trioxide and the influence of the particle size distribution to determine the optimum reaction conditions, and the amplification test. The results showed that the resulting product is a cubic crystal, and a mixed system of the orthorhombic type freon ion ligand; With the increase of the proportion of fluoride ions, the resulting product in the content of the cubic crystal growing orthorhombic type content constantly decreases; when n (F) / n (Sb) ≥ 1 the resultant Sb of 2 O 3 having a single cubic crystalline form, and thereafter with N (F) / n (Sb) continues to increase product polymorph no obvious change, it is determined that N (F) / n (Sb) = 1. Concentration of antimony ions mainly affects the particle size of the product, the concentration of the smaller particle size is smaller; consideration of production cost and efficiency, this concentration should not be too small, select antimony ion concentration of 0.025 mol / L; antimony oxide particle diameter of 200 nm.; while the temperature and the molecular weight of the modifying agent is mainly affect the range of the particle size distribution of the obtained antimony oxide, the lower the temperature the more narrow distribution; taking into account the energy consumption in the production process, to select the 30 ℃ appropriate. The polyethylene glycol 6000 has a larger mesh structure, the resulting product can the particle size distribution is narrowed. Melamine resin coated the Sb 2 O 3 Preparation of soft PVC with melamine resin the amplification experiment proceeds Sb 2 < / sub> O 3 surface coating, can be determined by XRD and TEM analysis of coated and uncoated product, melamine resin coated Sb 2 O 3 surface, and the thickness of the cladding layer can be regulated by adjusting the added amount of the prepolymer; coated and uncoated the Sb 2 O 3 of crystal form did not change significantly. Coated front and rear of the Sb 2 O 3 , respectively, added to the effects of soft PVC plastic, flame retardant properties and mechanical properties of PVC. The results showed that when the the MF-Sb 2 O 3 add the amount of up to 5% (by mass), soft PVC oxygen index increased from 23.8 to 30.0, to achieve the general resistance fuel requirements. Sb 2 O 3 the MF-Sb 2 O content of 25.2%, so soft PVC plastic Sb 2 O 3 actual content of only 1.26%; retardant efficiency equivalent to adding 3.55% Sb 2 O 3 , Sb 2 O 3 's consumption decreased by 64.5%. The Sb other added amount to achieve the same oxygen index 2 O 3 consumption were significantly lower dosage the oxygen index up 1% to 81.3%. It can be seen, achieve the same flame retardant properties, can greatly reduce the surface coated by Sb 2 O 3 Sb O 3 amount to reduce flame retardants possible impact on the environment, while saving antimony resources. Melamine resin coated the Sb 2 O 5 Preparation of soft PVC first oxidation reflux were prepared better dispersion, The Sb 2, a uniform distribution of particle diameter (10 ~ 20 nm) O 5 colloidal melamine resin, and then use its surface covering. XRD and TEM analysis of coated and uncoated product can be determined, melamine resins have been successfully coated in SB 2 O 5 surface, and the thickness of the cladding layer can be adjust the amount of prepolymer the and regulation; but the Coated Sb 2 O to 5 crystal form did not change significantly. Coated and uncoated Sb 2 O 5 were added to soft PVC plastic, the when the MF-Sb 2 O 5 < / sub> add 5% of soft PVC oxygen index increased from 23.8 to 28.3 to reach the general flame retardant requirements. MF-Sb 2 O 5 Sb 2 O 5 content of 34.2%, so PVC plastic in Sb 2 O 5 dosage of 1.7% in real terms; retardant effect is equivalent to adding 4.8% Sb 2 O 5 , Sb 2 O 5 's consumption decreased by 64.1%. In the other addition amount to achieve the same oxygen index Sb 2 O 5 added amount of both a decline of about 50%. This shows that to achieve the same flame retardant properties, surface coating can significantly reduce the Sb 2 O Sb 2 O 5 < sub> 5 amount; able to add the right amount of MF-Sb 2 O 5 increase the tensile strength of soft PVC. The reason is that the melamine resin, not only can enhance the Sb 2 O 5 particles with PVC substrate compatibility, while play to their flame-retardant features, the inorganic / efficient combination of organic flame retardants.

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