Modified ammonium polyphosphate coated with silica-alumina hydrogel double layer and its application in flame retardant polypropylene

Abstract

The invention relates to silica-alumina hydrogel double-coated modified ammonium polyphosphate and an application thereof to inflaming retarding polypropylene. Double-coated modification is carried out on ammonium polyphosphate by silica gel and alumina gel so that the surface performance of ammonium polyphosphate and the inflaming retarding performance of the system are improved. According to the silica-alumina hydrogel double-coated modified ammonium polyphosphate, tetraethoxysilane, aluminum nitride and ammonium polyphosphate are utilized and absolute ethyl alcohol is used as a dispersant, and the materials are reacted to generate the silica-alumina hydrogel double-coated modified ammonium polyphosphate. The heat stability and the inflaming retarding performance of the modified ammonium polyphosphate and the unmodified ammonium polyphosphate are improved. The prepared silica-alumina hydrogel double-coated modified ammonium polyphosphate and polyamide 6 are cooperated to be commonly used as an expansion type fire retardant which is applied to inflaming retarding of a polypropylene material; and the extreme oxygen index, the UL-94 vertical combustion grade, the heat stability, the charcoal forming capability and the like of the obtained composite inflaming retarding polypropylene material are remarkably improved.

Description

technical field

[0001] The invention relates to a preparation method for double-coating and modifying ammonium polyphosphate with silica gel and aluminum gel and its application in flame-retardant polypropylene, which improves the flame-retardant performance of the system and belongs to the technical field of flame-retardant materials . Background technique

[0002] Polypropylene is widely used in many fields due to its excellent mechanical properties, low production cost and easy processing. However, as a polyolefin material, polypropylene is extremely flammable, and will produce molten droplets to spread flames and cause fires, so its application in electrical and electronic, building materials and other fields is greatly limited. Improving the flame retardancy of polypropylene remains a major challenge to extending its use in most applications and has been a research hotspot this year. One of the most effective ways to improve its flame retardancy is to add intumescent ...

Examples

Embodiment 1

[0024] Preparation method of silica-alumina hydrogel double-coated modified ammonium polyphosphate:

[0025] (1) Add 300g of ammonium polyphosphate, 450mL of absolute ethanol and 3g of surfactant (OP-10) into a 1000mL three-necked flask equipped with a reflux condensing device, a thermometer and a mechanical stirrer, and the three-necked flask is placed in a water bath Heat while stirring, raise the temperature to 50°C, adjust the pH value between 9.5 and 10.5 with ammonia water, stir for 20 minutes, and the stirring speed is 250r / min. Made into ammonium polyphosphate slurry.

[0026] (2) Prepare a solution with 30 g of tetraethyl orthosilicate and 45 mL of deionized water, and adjust the pH value between 9.5 and 10.5 with ammonia water. This solution was poured into the ammonium polyphosphate slurry, and the reaction was stirred for 120 minutes.

[0027] (3) 45g of aluminum nitrate and 60g of deionized water were formulated into a solution, and the pH value was adjusted bet...

Embodiment 2

[0032] The preparation method of the silica-alumina hydrogel double-coated modified ammonium polyphosphate is the same as that in Example 1.

[0033] Application of coated modified ammonium polyphosphate for flame retardant polypropylene:

[0034] 65 parts by weight of dry polypropylene, 5 parts by weight of polypropylene grafted maleic anhydride, 27 parts by weight of silica-alumina hydrogel double-layer coated modified ammonium polyphosphate and 3 parts by weight of polyamide 6 in a mixer After fully mixing in the medium, use a twin-screw extruder to knead and granulate. The temperature range of the extruder is 180-250°C (the lowest end temperature of the extruder is 180°C, and the highest end temperature is 250°C), and the screw speed is 150rpm. Finally, the masterbatch of composite flame-retardant polypropylene material is obtained. After the masterbatch is dried, it is injection molded into a standard test sample with an injection molding machine. The injection molding t...

Embodiment 3

[0036] The preparation method of the silica-alumina hydrogel double-coated modified ammonium polyphosphate is the same as that in Example 1.

[0037] Application of coated modified ammonium polyphosphate for flame retardant polypropylene:

[0038] 65 parts by weight of dry polypropylene, 5 parts by weight of polypropylene grafted maleic anhydride, 24 parts by weight of silica-alumina hydrogel double-layer coated modified ammonium polyphosphate and 6 parts by weight of polyamide 6 in a mixer After fully mixing in the medium, use a twin-screw extruder to knead and granulate. The temperature range of the extruder is 180-250°C (the lowest end temperature of the extruder is 180°C, and the highest end temperature is 250°C), and the screw speed is 150rpm. Finally, the masterbatch of composite flame-retardant polypropylene material is obtained. After the masterbatch is dried, it is injection molded into a standard test sample with an injection molding machine. The injection molding t...

technical field

[0001] The invention relates to a preparation method for double-coating and modifying ammonium polyphosphate with silica gel and aluminum gel and its application in flame-retardant polypropylene, which improves the flame-retardant performance of the system and belongs to the technical field of flame-retardant materials . Background technique

[0002] Polypropylene is widely used in many fields due to its excellent mechanical properties, low production cost and easy processing. However, as a polyolefin material, polypropylene is extremely flammable, and will produce molten droplets to spread flames and cause fires, so its application in electrical and electronic, building materials and other fields is greatly limited. Improving the flame retardancy of polypropylene remains a major challenge to extending its use in most applications and has been a research hotspot this year. One of the most effective ways to improve its flame retardancy is to add intumescent ...

Examples

Embodiment 1

[0024] Preparation method of silica-alumina hydrogel double-coated modified ammonium polyphosphate:

[0025] (1) Add 300g of ammonium polyphosphate, 450mL of absolute ethanol and 3g of surfactant (OP-10) into a 1000mL three-necked flask equipped with a reflux condensing device, a thermometer and a mechanical stirrer, and the three-necked flask is placed in a water bath Heat while stirring, raise the temperature to 50°C, adjust the pH value between 9.5 and 10.5 with ammonia water, stir for 20 minutes, and the stirring speed is 250r / min. Made into ammonium polyphosphate slurry.

[0026] (2) Prepare a solution with 30 g of tetraethyl orthosilicate and 45 mL of deionized water, and adjust the pH value between 9.5 and 10.5 with ammonia water. This solution was poured into the ammonium polyphosphate slurry, and the reaction was stirred for 120 minutes.

[0027] (3) 45g of aluminum nitrate and 60g of deionized water were formulated into a solution, and the pH value was adjusted bet...

Embodiment 2

[0032] The preparation method of the silica-alumina hydrogel double-coated modified ammonium polyphosphate is the same as that in Example 1.

[0033] Application of coated modified ammonium polyphosphate for flame retardant polypropylene:

[0034] 65 parts by weight of dry polypropylene, 5 parts by weight of polypropylene grafted maleic anhydride, 27 parts by weight of silica-alumina hydrogel double-layer coated modified ammonium polyphosphate and 3 parts by weight of polyamide 6 in a mixer After fully mixing in the medium, use a twin-screw extruder to knead and granulate. The temperature range of the extruder is 180-250°C (the lowest end temperature of the extruder is 180°C, and the highest end temperature is 250°C), and the screw speed is 150rpm. Finally, the masterbatch of composite flame-retardant polypropylene material is obtained. After the masterbatch is dried, it is injection molded into a standard test sample with an injection molding machine. The injection molding t...

Embodiment 3

[0036] The preparation method of the silica-alumina hydrogel double-coated modified ammonium polyphosphate is the same as that in Example 1.

[0037] Application of coated modified ammonium polyphosphate for flame retardant polypropylene:

[0038] 65 parts by weight of dry polypropylene, 5 parts by weight of polypropylene grafted maleic anhydride, 24 parts by weight of silica-alumina hydrogel double-layer coated modified ammonium polyphosphate and 6 parts by weight of polyamide 6 in a mixer After fully mixing in the medium, use a twin-screw extruder to knead and granulate. The temperature range of the extruder is 180-250°C (the lowest end temperature of the extruder is 180°C, and the highest end temperature is 250°C), and the screw speed is 150rpm. Finally, the masterbatch of composite flame-retardant polypropylene material is obtained. After the masterbatch is dried, it is injection molded into a standard test sample with an injection molding machine. The injection molding t...

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