Method for preparing high-toughness high-strength polypropylene material through in-situ compatibilization
The invention relates to a method for preparing high-toughness high-strength polypropylene material through in-situ compatibilization. The method comprises the steps of uniformly mixing polypropylene, ethylene-octylene copolymer, grafted polar monomers and initiators in a mixer, then uniformly mixing superfine inorganic mineral powder, surface treating agents, dispersion lubricating agents and antioxidants in a mixer, adding the mixtures into an extruder separately, reacting and mixing at 170-230 DEG C, extrusion granulating, and carrying out post-devolatilization on the materials in a drum tackifying machine, wherein a vacuum pump is started to carry out primary devolatilization during the extrusion process. According to the method, modified fillers and auxiliaries are added in the polypropylene grafting reaction extruding process, the method belongs to the in-situ compatibilization process for improving the toughness and the strength, the traditional process in which the polypropylene grafted polymer is firstly prepared and then secondary modification is carried out is simplified, the cost is saved and the dispersion uniformity of the fillers and the compatibility with base resin are ensured. 1. An in-situ compatibilization, high toughness and high strength polypropylene material preparation method, characterized in that the method comprises the following steps: Step one: the polypropylene, ethylene-octene copolymer, grafted polar monomer and initiator are mixed in the blender, the parts by weight of each component of: Polypropylene 100 Ethylene-octene copolymer 5-10 Graft polar monomer 1-5 Initiator 0.2-1.0; Step two: the powdered ore superfine inorganic , surface treating agent, dispersing lubricant and anti-oxidant are mixed in the blender, the parts by weight of each component of: Inorganic mineral powder 10-30 Dispersing lubricant 0.1-0.5 Antioxidant 0.1-0.4 Surface treating agent 0.1-0.5; Step three: the step one the spout front from the extrusion of a mixture of, the mixture of the second step from the extrusion machine side animal feed port are respectively added to the extruder, the extrusion temperature is and the 170-230 [...] after mixing reaction under the process conditions, extrusion granulation, to obtain the in-situ compatibilization, high toughness and high strength polypropylene material. 2. An in-situ compatibilization, high toughness and high strength polypropylene material preparation method according to Claim 1, characterized in that in the extrusion process, the vacuum pump is opened, the vacuum degree of the extrusion machine to -0.08 MPa, under these conditions the material preliminary devolatilization; at the same time after extrusion granulation, at a pressure of 130 Pa, devolatilization temperature is 80 the process conditions [...] , tackifying of the rotary drum the material later in the devolatilization treatment. 3. the grafted polar monomer is a norbornene--like anhydride, maleic anhydride, glycidyl methacrylate, butyl methacrylate, hydroxyethyl methacrylate, methyl methacrylate in one or several of the hybrid. 4. An in-situ compatibilization, high toughness and high strength polypropylene material preparation method according to Claim 1, characterized in that the initiator is oxide initiator, selection 2, 5-dimethyl -2, 5-bis (T-butyl peroxy) hexane, double-two-four-[ double (2, 4-dichloro-benzoyl) peroxide, too oxidizes two (4-methyl benzoyl), cumyl peroxide, di (T-butyl peroxide isopropyl) benzene, 1, 1-di-tert-butyl methyl -3, 5, 5-trimethyl cyclohexane in one or several of the hybrid. 5. An in-situ compatibilization, high toughness and high strength polypropylene material preparation method according to Claim 1, characterized in that the inorganic powder is calcium carbonate, nano-talc powder, nano-magnesium hydroxide, nano-hydroxide, nanometer polynite, nanometer wollastanite, nanometer kaolin in one or several of the hybrid. 6. An in-situ compatibilization, high toughness and high strength polypropylene material preparation method according to Claim 1, characterized in that the surface treatment agent is 3-triethoxy silyl-1-propylamine, γ-aminopropyl triethoxy silane, γ-glycidoxy propyl trimethoxy silane, γ-(methacryloxyl acyl oxide) propyl trimethoxysilane, stearic acid, a titanate, aluminate, in the caldron one or several kind of mixed. 7. An in-situ compatibilization, high toughness and high strength polypropylene material preparation method according to Claim 1, characterized in that the dispersing lubricant is ethylene bis-stearamide, PE xerochrysum, montanic acid , calcium stearate, stearic acid in one or several of the hybrid. 8. An in-situ compatibilization, high toughness and high strength polypropylene material preparation method according to Claim 1, characterized in that the anti-oxidant is anti-oxidant and phosphorous acid esters of hindered phenol anti-oxidant compound anti-oxidant, anti-oxidant and phosphorous acid esters of hindered phenol antioxidant weight ratio is 1 : 0.3-1: 0.7.