Flame-retardant sheet molding compound, its preparation method, flame-retardant fiber-reinforced composite material pressed therefrom, and its preparation method
A sheet molding compound, flame-retardant technology, applied in chemical instruments and methods, compounds of group 5/15 elements of the periodic table, phosphorus organic compounds, etc., can solve the problems of thickening and flame retardancy of ordinary vinyl resins , to achieve the effect of improving flame retardancy and improving flame retardancy
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[0078] Step 3, the preparation of vinyl SMC resin
[0079] The polycarboxy compound prepared by step 2 is mixed with the vinyl resin according to a predetermined ratio, and the vinyl SMC resin is prepared; in parts by weight, its components are as follows:
[0080] Step 4. Preparation of sheet molding compound
[0081] Carry out and sheet preparation according to following formula and parts by weight,
[0082] Resin part:
[0083] 60-70 parts of vinyl SMC resin prepared in step 3
[0084] Anti-shrinkage agent 20-40 parts
[0085] Inhibitor 0.1-0.3 parts
[0086] Initiator 1.5-3 parts
[0087] Release agent 5-10 parts
[0088] Thickener 3-5 parts
[0089] Filling 20-70 parts
[0090] Fiber part:
[0091] Reinforced fiber 70-120 parts
[0092] Put the resin prepared according to the above formula into the mixing equipment, stir evenly to obtain a resin paste, impregnate the resin paste and reinforcing fibers on the sheet unit, and then make a sheet through pressing and...
Embodiment 1
[0100] Step 1: Ring-opening reaction of monoalkyl phosphates to monoepoxides
[0101] 10mol monomethyl phosphate (R is -CH 3 ) and 20mol butyl glycidyl ether were added to a ceramic kettle and stirred at ambient temperature for 0.5h.
[0102] The second step: the introduction of double bonds and carboxyl functional groups
[0103] Continue to add 20mol maleic anhydride in the ceramic kettle of the first step, raise the temperature to 90°C, stir for 5h, and obtain the polycarboxylate compound containing phosphorus and double bonds (R 1 for C 4 h 9 O-), the molecular weight of the compound is 536g / mol, and the phosphorus content is 5.78%.
[0104] The third step: mix the compound prepared in the first step and the second step with a commercially available epoxy vinyl resin (Shanghai Huachang Company, MFE-711) in a weight ratio of 2:8 to prepare a vinyl SMC resin.
[0105] Step 4: Prepare the sheet according to the following formula and parts by weight:
[0106] 60 parts of...
Embodiment 2
[0117] Step 1: Ring-opening reaction of monoalkyl phosphates to monoepoxides
[0118] 10mol monobutyl phosphate (R is -C 4 h 9 ) and 20mol epichlorohydrin were added to the ceramic kettle and stirred at ambient temperature for 0.5h.
[0119] The second step: the introduction of double bonds and carboxyl functional groups
[0120] Continue to add 20mol maleic anhydride to the first ceramic kettle, raise the temperature to 120°C, stir for 0.5h,
[0121] Polycarboxylates containing phosphorus and double bonds (R 1 for CH 2 Cl-), the molecular weight of this compound is 530g / mol, and the phosphorus content is 5.85%.
[0122] Step 3: Mix the compounds prepared in the first and second steps with commercially available polyurethane vinyl resin (Ureplu-1119 from Nantong Matech Co., Ltd.) at a weight ratio of 4:8 to prepare vinyl SMC resin.
[0123] Step 4: Prepare the sheet according to the following formula and parts by weight:
[0124] 70 parts of vinyl SMC resin prepared in ...
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