Modified flame-retardant polypropylene composite material and preparation method thereof
A technology of flame-retardant polypropylene and composite materials, which is applied in the field of flame-retardant polymer materials, can solve the problems of fast flame propagation, difficulty in extinguishing, and high calorific value, and achieves simple and easy preparation methods, excellent flame-retardant properties and mechanical properties. performance effect
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Embodiment 1
[0028] The performance of each component in this example is as follows: polypropylene (PP) melt index 10g / min; intumescent flame retardant (IFR) pH value is 4.5; organic montmorillonite (OMMT) is sodium-based montmorillonite, pH The value is 5.5, the particle size is 400 mesh, and the content of montmorillonite is 90% (wt%); the pH value of cetyltrimethylammonium bromide (CTAB) is 5.5, and the content of free amine is 0.3% (wt%) .
[0029] The preparation method of the modified flame-retardant polypropylene composite material is as follows:
[0030] (1) Add 0.6 parts of cetyltrimethylammonium bromide dropwise to 2 parts of organic montmorillonite suspension, stir and heat up to 80 °C for polymerization intercalation reaction for 24 hours; then filter, wash, and then Vacuum dry at 60°C to constant weight; finally grind and sieve to obtain modified nano-montmorillonite;
[0031] (2) Dry 70 parts of polypropylene at 100°C for 10 hours;
[0032] (3) Add dry polypropylene, modif...
Embodiment 2
[0036] The performance of each component in this example is as follows: Polypropylene (PP) melt index 30g / min, intumescent flame retardant (IFR) pH value is 5;
[0037] Organic montmorillonite (OMMT) is sodium-based montmorillonite, with a pH value of 6, a particle size of 800 mesh, and a montmorillonite content of 95% (wt%); cetyltrimethylammonium bromide (CTAB) The pH value is 6.5, and the free amine content is 0.2% (wt%).
[0038] The preparation method of the modified flame-retardant polypropylene composite material is as follows:
[0039] (1) Add 0.2 parts of cetyltrimethylammonium bromide dropwise to 1 part of organic montmorillonite suspension, stir and heat up to 60 °C for polymerization intercalation reaction for 26 hours; then filter, wash, and Vacuum dry at 40°C to constant weight; finally grind and sieve to obtain modified nano-montmorillonite;
[0040] (2) Dry 60 parts of polypropylene at 80°C for 2 hours;
[0041] (3) Add dry polypropylene, modified nano-montm...
Embodiment 3
[0045] The performance of each component in this example is as follows: polypropylene (PP) melt index 50g / min; intumescent flame retardant (IFR) pH value is 5.5; organic montmorillonite (OMMT) is sodium-based montmorillonite, pH The value is 6.5, the particle size is 1600 mesh, and the content of montmorillonite is 100% (wt%); the pH value of cetyltrimethylammonium bromide (CTAB) is 6.5, and the content of free amine is 0.1% (wt%) .
[0046] The preparation method of the modified flame-retardant polypropylene composite material is as follows:
[0047] (1) Add 5 parts of cetyltrimethylammonium bromide dropwise to 10 parts of organic montmorillonite suspension, stir and heat up to 100 °C for polymerization intercalation reaction for 22 hours; then filter, wash, and then Vacuum dry at 80°C to constant weight; finally grind and sieve to obtain modified nano-montmorillonite;
[0048] (2) Dry 90 parts of polypropylene at 120°C for 10 hours;
[0049](3) Add dry polypropylene, modi...
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