Preparation method of organic silicon fire retardant of organic silicon rubber wastes

Abstract

The invention discloses an organic silicon fire retardant of organic silicon rubber wastes. The organic silicon fire retardant comprises a raw material, a fire retardation synergy composition, a catalyst and an active phosphorus compound, and the raw material comprises 20-40 parts of the organic silicon rubber wastes, 30-40 parts of melamine, 20-30 parts of a silane coupling agent, 10-20 parts of a strong alkali and 20-40 parts of deionized water; and the fire retardation synergy composition comprises 6-8 parts of carbon nanotubes, 2-4 parts of a nanometer meso-porous molecular sieve, 3-5 parts of nanometer attapulgite, 4-6 parts of micrometer silicon nitride and 4-8 parts of micrometer silicon carbide. The organic silicon fire retardant based on the organic silicon rubber wastes has very good hydrophobic performance, and can be added to polypropylene in order to substantially improve the fire retardation performance of polypropylene.

Description

technical field [0001] The invention relates to the recycling field of organic silicon rubber waste, in particular to a method for preparing an organic silicon flame retardant from organic silicon rubber waste. Background technique [0002] Due to its outstanding high temperature resistance, oxidation resistance, aging resistance, weather resistance and low temperature flexibility, silicone rubber has an increasingly wide range of applications. However, its raw materials are expensive, and there are always wastes in the processing and application. Because these wastes are vulcanized at high temperature, the molecular chains are cross-linked, so they cannot be degraded naturally; if they are not handled properly, they will seriously pollute the environment. At present, how to recycle waste materials and reuse them rationally to achieve sustainable development of resources has attracted people's attention. [0003] At present, polymer materials and polymers have been widely ...

AI Technical Summary

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

In addition to endowing the substrate with excellent flame retardant properties, organosilicon flame retardants can also improve the processing performance and heat resistance of the substrate; however, due to the high price, the application is also limited

[0004] According to the British "Polymer Degradation and Stability" (Polymer Degradation and Stability, 90:523-534, 2005), the addition of 40% of the total mass of the system to the flame retardant polypropylene made of melamine ammonium sulfate and pentaerythritol In order to reach the UL-94V0 level, but due to the large amount of intumescent flame retardant added, the mechanical properties of the material such as tensile strength and breaking strength will decrease

[0005] According to the American Journal of Polymer Science (Journal of Polymer Science, part A: Polymerchemistry 42:6163-6173, 2004), when organic montmorillonite and intumescent flame retardants are synergistically flame-retardant polypropylene, when the mass of organic montmorillonite accounts for the system When the total mass percentage is 4%, the heat release rate of flame-retardant polypropylene can be significantly reduced; but as the content of organic montmorillonite increases (after more than 4%), the flame-retardant effect decreases due to agglomeration

[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.