Flame retardant based on organic silicon resin

Abstract

The invention discloses a flame retardant based on organic silicon resin. The flame retardant is prepared from the following raw materials in parts by weight: 30-50 parts of organic silicon resin, 20-40 parts of organic silicon elastomer, 10-20 parts of ammonium sulfide, 5-7 parts of tellurium dioxide, 1-5 parts of a silane coupling agent, 5-10 parts of sodium hydroxide, 80-120 parts of alcohol, 10-15 parts of magnesium hydroxide, 5-10 parts of diatomite, 5-15 parts of poly(phosphorus oxide), 40-60 parts of deionized water and 2-17 parts of a flame-retardant synergistic composition. The flame retardant based on organic silicon resin is very good in hydrophobic property, and capable of remarkably improving flame resistance, which reaches level UL-94 V-0, of polypropylene, and obviously improving mechanical performances (tensile strength, bending strength and impact strength) of the material; a limit oxygen index of the polypropylene can be higher than 38.5%.

Description

technical field [0001] The invention relates to the technical field of organosilicon flame retardants, in particular to an organosilicon resin-based flame retardant. Background technique [0002] At present, polymer materials and polymers have been widely used in industrial production and daily life. Most polymer materials Polymers are flammable and play a dominant role in combustible solid fires. Therefore, flame-retardant polymer materials have become a key research direction in the field of materials, and additive flame retardants are currently the most widely used. At present, the annual usage of additive flame retardants exceeds 1 million tons. Among them: (1) Although inorganic flame retardants such as magnesium hydroxide and aluminum hydroxide have both flame-retardant and smoke-suppressing effects and do not produce toxic and corrosive gases when burned, they are seriously affected due to the large amount of addition required. The physical, mechanical and processi...

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Problems solved by technology

Among them: (1) Although inorganic flame retardants such as magnesium hydroxide and aluminum hydroxide have both flame-retardant and smoke-suppressing effects and do not produce toxic and corrosive gases when burned, they are seriously affected due to the large amount of addition required. Physical, mechanical properties and processing properties of flame retardant materials

(2) Although organic halogen-based flame retardants have the characteristics of high flame retardant efficiency and high cost performance, their application fields have been limited because HX, which acts as a flame retardant, is a toxic and corrosive gas that is harmful to the environment and human body. , has gradually been eliminated

(3) Halogen-free flame retardant (IFR) has the advantages of low smoke and non-toxicity. IFR uses phosphorus, nitrogen, and carbon as the main core components, and it will produce a synergistic flame retardant effect when heated; the compound IFR is usually polyphosphoric acid Ammonium (APP) is used as the acid source, melamine (MEL) is used as the foaming agent, and pentaerythritol (PER) is used as the carbon forming agent. When exposed to high heat, a uniform and dense carbon foam layer can be formed, which can be used for heat insulation, oxygen insulation, and smoke suppression. , anti-droplet, has good flame retardant properties; but most of these flame retardants are hydrophilic, poor compatibility with polymer substrates, and the required addition amount is large, which affects the high flame retardant The physical properties of molecular materials and polymers, so they cannot meet the needs of polymer materials

[0005] The current disadvantage of silicone resin is that it has poor heat resistance and its surface is sticky after curing

[0006] In addition, although the flame retardant polymers containing nitrogen and phosphorus intumescent flame retardants or nitrogen and phosphorus intumescent flame retardants and flame retardant synergists prepared by the melt blending method have the characteristics of low smoke, non-toxicity and resistance to solvent droplets, However, the flame retardant effect is still not ideal, and the drop resistance needs to be improved, and the mechanical properties of the material such as tensile strength and breaking strength will decrease due to the large amount of flame retardant added, and the production cost is relatively high.

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