Halogen-free flame-retardant engineering plastic and preparation method thereof
A technology of engineering plastics and conditions, applied in the field of engineering plastics, can solve the problems of toxic gas, suffocation and death, and large amount of smoke.
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[0014] The present invention provides a method for preparing halogen-free flame-retardant engineering plastics, wherein the preparation method includes:
[0015] 1) 1-oxyphospha-4-hydroxymethyl-2,6,7-trioxabicyclo[2,2,2]octane, phosphorus oxychloride, sodium dehydroacetate and acetonitrile were protected under nitrogen Under the conditions of 60-90°C, react for 5-7h, filter, and then dry at 60-100°C to obtain solid M1;
[0016] 2) In the presence of a solvent, mix the solid M1 obtained in step 1) with 4,4'-diaminodiphenylmethane under heating conditions and filter, and place the filter residue at 0-5°C to cool , to obtain precipitate M2;
[0017] 3) After mixing and melting polybutylene terephthalate, the precipitated M2 prepared in step 2), nylon fiber and toughening agent, after extrusion, cooling and pelletizing, the halogen-free flame-retardant engineering plastic.
[0018] The present invention reacts 1-oxyphospha-4-hydroxymethyl-2,6,7-trioxabicyclo[2,2,2]octane, phosp...
Embodiment 1
[0031] 1) 10g of 1-oxyphospha-4-hydroxymethyl-2,6,7-trioxabicyclo[2,2,2]octane, 2mL of phosphorus oxychloride, 5mL of dehydroacetic acid Sodium and 80 mL of acetonitrile were reacted at 60°C for 5 hours under nitrogen protection, filtered, washed with trichloroethane three times, and dried at 60°C for 10 hours to prepare Obtain solid M1;
[0032] 2) In the presence of 150 parts by weight of water, 10 parts by weight of the solid M1 prepared in step 1) is mixed with 4 parts by weight of 4,4'-diaminodiphenylmethane under heating conditions and filtered , the filter residue was washed with water for 3 times, cooled at 0°C, and then dried at 70°C to obtain precipitate M2;
[0033] 3) 100 parts by weight of polybutylene terephthalate, 10 parts by weight of the precipitate M2 prepared in step 2), 5 parts by weight of nylon fiber and 1 part by weight of the toughening agent are mixed and smelted, and then After extrusion, cooling and pelletizing, the halogen-free flame-retardant en...
Embodiment 2
[0035] 1) 10g of 1-oxyphospha-4-hydroxymethyl-2,6,7-trioxabicyclo[2,2,2]octane, 5mL of phosphorus oxychloride, 15mL of dehydroacetic acid Sodium and 120mL of acetonitrile were reacted at 90°C for 7 hours under nitrogen protection, filtered, washed with trichloroethane for 3 times, and dried at 100°C for 15 hours to prepare Obtain solid M1;
[0036] 2) In the presence of 200 parts by weight of water, 10 parts by weight of the solid M1 prepared in step 1) is mixed with 8 parts by weight of 4,4'-diaminodiphenylmethane under heating conditions and filtered , the filter residue was first washed with water for 3 times, cooled at 5°C, and then dried at 90°C to obtain precipitate M2;
[0037] 3) After the precipitation M2, the nylon fiber of 10 parts by weight and the toughening agent of 5 parts by weight are mixed and smelted by 100 parts by weight of polybutylene terephthalate, 20 parts by weight of the step 2), the After extrusion, cooling and pelletizing, the halogen-free flame-...
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