CN103113666A - Polypropylene composite material filter plate and preparation method thereof - Google Patents
Polypropylene composite material filter plate and preparation method thereof Download PDFInfo
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- CN103113666A CN103113666A CN2012105533253A CN201210553325A CN103113666A CN 103113666 A CN103113666 A CN 103113666A CN 2012105533253 A CN2012105533253 A CN 2012105533253A CN 201210553325 A CN201210553325 A CN 201210553325A CN 103113666 A CN103113666 A CN 103113666A
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Abstract
The invention relates to a polypropylene (PP) composite material filter plate which comprises the components in parts by weight as follows: 50-80 parts of polypropylene, 5-20 parts of graphite powder, 8-20 parts of glass fiber, 1-3.6 parts of surface treating agent, 0.4-7.4 parts of unsaturated carboxylic acid and polypropylene graft phase solvent, 0.6-1.6 parts of maleic anhydride phase solvent, 0.4-3 parts of coupler and 1-4 parts of antioxidant. The preparation method comprises the following steps of: firstly, carrying out surface treatment on graphite powder and glass fiber; then, mixing polypropylene, unsaturated carboxylic acid, polypropylene graft phase solvent, antioxidant and graphite powder after surface treatment at high speed to obtain a graphite/PP mixture; and then, extruding the graphite/PP mixture and dried glass fiber to obtain graphite modified and reinforced PP particles and drying the particles; and extruding, melting, pressing and machining the graphite modified and reinforced PP particles. The filter plate provided by the invention is good in heat resistance, excellent in pressure resistance, strong in chemical corrosion resistance and long in service life; and the application range of a filter press is expanded.
Description
Technical field
The present invention relates to filter press filter board and make the field, be specifically related to a kind ofly can be widely used in the industries such as chemical industry, environmental protection, metallurgy, polypropylene composite material filter plate of high temperature resistant, withstand voltage, fine corrosion resistance and preparation method thereof.
Background technology
Filter press filter board material commonly used is comprised of polypropylene and calcium carbonate, talcum powder or glass fibre etc. now, in strong solid-liquid separation, obviously apparent fitness value is not strong to high temperature, resistance to chemical attack especially in industries such as chemical industry, has the shortcomings such as maintenance cost is high, work-ing life is short.For this situation, the domestic polypropylene composite materials that begins one's study is as the filter press filter board material, compare with other mineral based material due to graphite material and have excellent heat-resistingly, corrosion-resistant and strengthen the property, thereby become the important source material of polypropylene composite materials.at present more existing researchs for the graphite modified polypropylene material, exploitation and patent literature, as a kind of novel material research and probe and new product development, successfully utilize graphite modified polypropylene tubular reaction still to substitute glassed steel reaction vessels, and the research and development graphite modified polypropylene is as the chemical reaction column plate, heat exchanger, scatterer etc., but only adopt graphite to make properties-correcting agent in these materials, make polyacrylic heat transfer, the performances such as conduction improve, but obviously on the low side as performances such as its intensity of filter press filter board material, and still belong to blank for the required graphite modified Reinforced Polypropylene novel material research application facet of filter press filter board, caused existing polypropylene filter plate in thermotolerance, erosion resistance with high pressure resistant all have higher requirements down carry out waste liquid or raw material solid-liquid pressure-filtering separate in its performance obviously not enough, affected its range of application, its work-ing life is shorter simultaneously, cost also increases greatly.
Summary of the invention
The deficiency of making filter press filter board in order to realize overcoming existing polypropylene material the invention provides that a kind of intensity is high, the polypropylene composite materials filter plate of excellent property and preparation method thereof.
The technical solution used in the present invention is:
A kind of polypropylene composite material filter plate, its composition comprises following component by mass: 50～80 parts of polypropylene, 5 ~ 20 parts of Graphite Powder 99s, 8 ~ 20 parts, glass fibre, 1～3.6 part of surface treatment agent, unsaturated carboxylic acid and 0.4～7.4 part of polyacrylic grafts phase solvent, 0.6～1.6 part of maleic anhydride phase solvent, 0.4～3 part of coupling agent, 1～4 part, oxidation inhibitor.
Described surface treatment agent comprises rare earth aluminic acid fat composite treating agent and titanic acid ester treatment agent.
Described coupling agent comprises one or more in rare earth aluminic acid fat composite coupler, titanate coupling agent, silylation coupling agent.
Described oxidation inhibitor comprises one or both mixing in phenolic antioxidant, divalent sulfur compound.
The preparation method of a kind of polypropylene composite material filter plate disclosed by the invention comprises the following steps:
(1) take each raw material by mass fraction;
(2) Graphite Powder 99 is carried out high speed heat agitated heating, then surface treatment agent is dropped into and carry out discharging after surface treatment in Graphite Powder 99;
(3) glass fibre of drying is undertaken by maleic anhydride phase solvent and coupling agent that the surface is soaked and dries under 90～140 ℃ of hot air circulation;
(4) polypropylene, unsaturated carboxylic acid and polyacrylic grafts phase solvent, oxidation inhibitor and the Graphite Powder 99 of step (2) after surface treatment are added and carry out high-speed stirring in the high-speed mixer successively evenly form the Property of Graphite/PP compound;
(5) glass fibre after oven dry in Property of Graphite/PP compound in step (4) and step (3) is carried out melting, shearing, mixing, homogenizing in forcing machine, extrude and tie rod and cooling, pelletizing after obtain graphite modified Reinforced Polypropylene particle;
(6)) the graphite modified Reinforced Polypropylene particle with gained in step (5) carries out preheating and drying, dried graphite modified Reinforced Polypropylene particle is carried out melt extrude, and the melt of extruding is positioned over insulation in insulation can;
(7) filter board mould press, forming mould are carried out preheating, the melt of extruding through insulation in step (6) is dropped into the filter board mould press and is pressed into the demoulding after the filter plate blank, then the filter plate blank is put into forming machine cooling, again the filter plate blank is taken out be placed into flatten stress ageging in warm water and process after, and keep flat at normal temperatures;
(8) the filter plate blank is processed into the filter plate finished product.
In described step (2), Graphite Powder 99 carries out high speed heat agitated heating in high-speed mixer, and the temperature of Graphite Powder 99 high speed heat agitated heating is 60～90 ℃, and the time of Graphite Powder 99 high speed heat agitated is 10～20min; Throw in surface treatment agent when the Graphite Powder 99 temperature reaches 85～120 ℃ in Graphite Powder 99, and keep high speed heat agitated state, carry out surface treatment when the Graphite Powder 99 temperature reaches 85～135 ℃, the surface treatment time is 10～20min.
Described step (4) high speed churning time is 8～15 minutes.
In described step (5), the extrusion temperature of forcing machine is 170～250 ℃, and extruded velocity is 250～350rpm.
In described step (6), the preheating and drying temperature is 60～100 ℃, and the time is 24～48 hours; The melt extrusion temperature is 170～260 ℃, and extruded velocity is 800～1200rpm; The insulation can temperature is 80～150 ℃.
The pre-thermal recovery steam heating of forming mould of filter board mould press in described step (7), temperature is 30～80 ℃, and the forming pressure of filter board mould press is 10～20MPa, and the compacting dwell time is 0.5 ~ 2 hour; In described forming machine, be 72 ~ 96 hours cooling time; It is to carry out in the warm water of 40～80 ℃ that described leveling stress ageging is processed, and the treatment time is 72～96 hours; Describedly keep flat the time and be at least more than 120 hours.
The invention has the beneficial effects as follows:
(1) the present invention adopts ultra micro Graphite Powder 99 material to glass fibre/polyacrylic composite strengthening modification, further strengthened the function of heat-resisting, mechanical property and the erosion resistance of filter plate, given in various degree filter plate and adapted to overall characteristic excellent under high temperature, high pressure, deep-etching condition;
(2) the present invention has adopted graphite material and the specific surface treatment mode of glass fibre, polypropylene in the combining main body alloy material, graphite, the characteristic of glass and surface effects, respectively Graphite Powder 99 and glass fibre are carried out surface treatment, rare earth clad aluminum acid esters is adopted in the Graphite Powder 99 surface treatment, the titanic acid ester surface treatment agent, maleic anhydride phase solvent and silane coupling agent or silane coupling agent and rare earth clad aluminum acid esters recombiner are adopted in the surface of glass fibre, the coupling agent that titanic acid ester is composite, because the rare earth in the rare earth composite coupler has unique outer shell structure and stronger coordination ability, not only has parents' coupled action, also have and inorganic graphite, glass fibre or organic polypropylene ligand form ionic linkage, improved the stability of main body organic materials, and at Aluminate, under the synergistic function of titanic acid ester or silane coupling agent and compatilizer, further improved inorganic materials graphite in alloy system, affinity between glass fibre GF and organic non-polar polypropylene, improved mutual linkage force, promoted the physical bond of interfacial chemistry bonding and Van der Waals force between Property of Graphite/PP/glass fibre, physical and chemical performance and the mechanical property of polypropylene composite material have been optimized,
(3) the present invention adopt that twin screw extruder extruding pelletization, single screw extrusion machine multistage mixingly melt extrude, the multistage aging treatment process such as stress relief after high-pressure molding technique and filter plate moulding, effectively eliminate owing to producing internal stress in polypropylene composite material filter plate forming process, guarantee stabilized structure, the excellent performance of filter plate, multiple with having stronger adaptive faculty under condition in temperature, pressure, chemical corrosion;
(4) high temperature resistant, the high-voltage performance of product of the present invention strengthens, and by larger raising, use range is wider than conventional filter plate for heat resistance, have stronger than existing filter press filter board chemical resistance, under comparatively high temps, elevated pressures condition, the filter plate long service life has reduced maintenance cost;
(5) cost performance of filter plate of the present invention is high, and recycling is fully accomplished pollution-free at links.
In sum, graphite modified reinforced polypropylene compound material of the present invention is compared with existing common filter plate, has high temperature resistant, resistance to chemical corrosion and excellent physical mechanical property.Under through the formula composition and preparation process condition optimized, the filter plate thermotolerance can reach 120～180 ℃, and tensile strength reaches 35～45MPa, flexural strength 40～52MPa, and shock strength is 10～14.8KJ/m
2, filter pressure 1～2.5MPa, its life-span can extend 1～3 year than existing filter plate, and makes pressure filter enlarge range of application.
Embodiment
Below by specific embodiment, further illustrate characteristics of the present invention.
Embodiment 1:
(1) batching: take each component raw material by following quality: (model is GFS-4 to the 13g Graphite Powder 99, 3 μ), 68g polypropylene (model is 045), (model is T738 or 988 to the 15g glass fibre, ), 2.8g model is the PP-g-MAH phase solvent of GP715, 1.2g maleic anhydride phase solvent, 2.4g surface treatment agent (the 1.2g model is that rare earth aluminic acid ester recombiner and the 1.2g model of DL-2 is the titanic acid ester of JTW-101), 0.6g model is the silane coupling agent of KH550, (model is the divalent sulfur compound that 1010 phenolic antioxidant and model are DSTP or DLTP to 3g oxidation inhibitor, the ratio of phenolic antioxidant and divalent sulfur compound is 1/1.5),
(2) first Graphite Powder 99 and glass fibre are carried out respectively surface treatment, Graphite Powder 99 is put into high-speed mixer carry out the heat agitated heating, the heat agitated Heating temperature is 80 ℃, the heat agitated time is 15min, when reaching 95 ℃, Graphite Powder 99 heat agitated time of arrival and Graphite Powder 99 temperature drop into surface treatment agent rare earth aluminic acid fat recombiner and titanic acid ester in order in Graphite Powder 99, and heat agitated together with Graphite Powder 99, the Graphite Powder 99 temperature that will drop into simultaneously after surface treatment agent rises to 110 ℃, makes Graphite Powder 99 discharging after at the temperature of 110 ℃, heat agitated 12min carries out surface treatment; Use maleic anhydride phase solvent and silylation liquid coupling agent to carry out the surface in dried glass fibre again and soak processing, and dry under 120 ℃ of hot air circulation; Then PP, unsaturated carboxylic acid added and mixed at normal temperatures 10 minutes in high-speed mixer successively with PP grafts compatilizer, oxidation inhibitor, surface treated Graphite Powder 99, forming graphite/PP compound;
With above-mentioned graphite/PP compound and the glass fibre after the surface is soaked and dried through twin screw extruder (Nanjing Rubber ﹠ Plastics Machinery Plant Co., Ltd., model is the mixing discharge type twin screw extruder of shearing of the multifunctional building-block of SJSH-65) melting, shearing, mixing, homogenizing, extrude, and tie rod and cooling, pelletizing form graphite modified enhancing PP particulate material, the expressing technique condition of twin screw extruder is: extrusion temperature is 180 ℃ of feed zones, all the other each sections are 230 ℃, and extruded velocity is 320rpm;
The graphite modified enhancing PP particulate material that twin screw extruder is extruded is placed at the temperature of 80 ℃ and was carried out preheating and drying in 36 hours; Then use single screw extrusion machine (Wuxi rubber and plastics machine Co., Ltd., Factory, model is the multistage mixed milling type single screw extrusion machine of SJ-90) graphite modified enhancing PP particulate material is melt extruded, single screw extrusion machine expressing technique condition is: extrusion temperature is 230 ℃ of feed zones, 260 ℃ of all the other sections, extruded velocity 900rpm, the melt of extruding is positioned in insulation can, and the insulation can temperature is controlled at 125 ℃; The melt compression moulding of single screw extrusion machine being extruded by the filter board mould press, first mould is adopted and be steam heated to 55 ℃, then the melt of extruding is dropped into compression moulding in filter board mould press mould, the pressing process parameter is: filter plate forming pressure 18MPa, dwell time is 1.2 hours, filter plate base after compacting is taken out put into forming machine 96 hours, take out again and flatten stress ageging in the warm water be placed into 45 ℃ and processed 96 hours, then lie in lower 120 hours of Normal Environmental Temperature as the filter plate work in-process;
At last with above-mentioned through ageing treatment, filter plate work in-process after keeping flat, by machining center, the filter plate two sides is processed and filter plate liquid in-out runner, equalizing port are processed into the filter plate finished product.
After tested, the filter plate salient features is: 178 ℃ of filter plate texturing temperatures, and tensile strength reaches 45MPa,, flexural strength 52MPa, shock strength is 13.5.8KJ/m
2, crack-free phenomenon under pressure 2MPa, pressurize withstand voltage test in 10 minutes.
Embodiment 2:
(1) batching: take the each component raw material by following quality: 5g Graphite Powder 99,84g polypropylene, 20g glass fibre, 7.4 g phase solvents, 0.6g maleic anhydride phase solvent, 1.0g surface treatment agent (0.5g rare earth aluminic acid ester recombiner and 0.5g titanic acid ester), 1.0g silane coupling agent, 3g oxidation inhibitor (phenolic antioxidant and divalent sulfur compound, the ratio of phenolic antioxidant and divalent sulfur compound for be 1/1.2);
(2) first Graphite Powder 99 and glass fibre are carried out respectively surface treatment, Graphite Powder 99 is put into high-speed mixer carry out the heat agitated heating, the heat agitated Heating temperature is 85 ℃, the heat agitated time is 20min, when reaching 90 ℃, Graphite Powder 99 heat agitated time of arrival and Graphite Powder 99 temperature drop into surface treatment agent rare earth aluminic acid fat recombiner and titanic acid ester in order in Graphite Powder 99, and heat agitated together with Graphite Powder 99, the Graphite Powder 99 temperature that will drop into simultaneously after surface treatment agent rises to 120 ℃, makes Graphite Powder 99 discharging after at the temperature of 120 ℃, heat agitated 10min carries out surface treatment; Use maleic anhydride phase solvent and silylation liquid coupling agent to carry out the surface in dried glass fibre again and soak processing, and dry under 120 ℃ of hot air circulation; Then PP, unsaturated carboxylic acid added and mixed at normal temperatures 15 minutes in high-speed mixer successively with PP grafts compatilizer, oxidation inhibitor, surface treated Graphite Powder 99, forming graphite/PP compound;
With above-mentioned graphite/PP compound and the glass fibre after the surface is soaked and dried through twin screw extruder melting, shearing, mixing, homogenizing, extrude, and tie rod and cooling, pelletizing form graphite modified enhancing PP particulate material, the expressing technique condition of twin screw extruder is: extrusion temperature is 170 ℃ of feed zones, all the other each sections are 220 ℃, and extruded velocity is 350rpm;
The graphite modified enhancing PP particulate material that twin screw extruder is extruded is placed at the temperature of 120 ℃ and was carried out preheating and drying in 24 hours; Then with single screw extrusion machine, graphite modified enhancing PP particulate material is melt extruded, single screw extrusion machine expressing technique condition is: extrusion temperature is 180 ℃ of feed zones, 210 ℃ of all the other sections, extruded velocity 800rpm, the melt of extruding is positioned in insulation can, and the insulation can temperature is controlled at 150 ℃; The melt compression moulding of single screw extrusion machine being extruded by the filter board mould press, first mould is adopted and be steam heated to 30 ℃, then the melt of extruding is dropped into compression moulding in filter board mould press mould, the pressing process parameter is: filter plate forming pressure 15MPa, dwell time is 2 hours, filter plate base after compacting is taken out put into forming machine 72 hours, take out again and flatten stress ageging in the warm water be placed into 50 ℃ and processed 72 hours, then lie in lower 150 hours of Normal Environmental Temperature as the filter plate work in-process;
At last with above-mentioned through ageing treatment, filter plate work in-process after keeping flat, adopt machining center that the filter plate two sides is processed and filter plate liquid in-out runner, equalizing port are processed into the filter plate finished product.
After tested, the filter plate salient features is: 168 ℃ of filter plate texturing temperatures, and tensile strength reaches 42MPa,, flexural strength 45MPa, shock strength is 12. 5KJ/m
2, flawless under pressure 1.6MPa, the pressurize withstand voltage test of 15 minutes.
Embodiment 3:
(1) batching: take the each component raw material by following quality: 20g Graphite Powder 99,52g polypropylene, 10g glass fibre, 1.4g phase solvent, 0.6g maleic anhydride phase solvent, 3.6g surface treatment agent (rare earth aluminic acid ester recombiner 2.3g and titanic acid ester 1.3g), 0.4g silane coupling agent, 1g oxidation inhibitor (phenolic antioxidant 0.4g and divalent sulfur compound 0.6g);
(2) first Graphite Powder 99 and glass fibre are carried out respectively surface treatment, Graphite Powder 99 is put into high-speed mixer carry out the heat agitated heating, the heat agitated Heating temperature is 90 ℃, the heat agitated time is 20min, when reaching 100 ℃, Graphite Powder 99 heat agitated time of arrival and Graphite Powder 99 temperature drop into surface treatment agent rare earth aluminic acid fat recombiner and titanic acid ester in order in Graphite Powder 99, and heat agitated together with Graphite Powder 99, the Graphite Powder 99 temperature that will drop into simultaneously after surface treatment agent rises to 120 ℃, makes Graphite Powder 99 discharging after at the temperature of 120 ℃, heat agitated 15min carries out surface treatment; Use maleic anhydride phase solvent and silylation liquid coupling agent to carry out the surface in dried glass fibre again and soak processing, and dry under 120 ℃ of hot air circulation; Then PP, unsaturated carboxylic acid added and mixed at normal temperatures 8 minutes in high-speed mixer successively with PP grafts compatilizer, oxidation inhibitor, surface treated Graphite Powder 99, forming graphite/PP compound;
With above-mentioned graphite/PP compound and the glass fibre after the surface is soaked and dried through twin screw extruder melting, shearing, mixing, homogenizing, extrude, and tie rod and cooling, pelletizing form graphite modified enhancing PP particulate material, the expressing technique condition of twin screw extruder is: extrusion temperature is 230 ℃ of feed zones, all the other each sections are 250 ℃, and extruded velocity is 280rpm;
The graphite modified enhancing PP particulate material that twin screw extruder is extruded is placed at the temperature of 60 ℃ and was carried out preheating and drying in 24 hours; Then with single screw extrusion machine, graphite modified enhancing PP particulate material is melt extruded, single screw extrusion machine expressing technique condition is: extrusion temperature is 250 ℃ of feed zones, 260 ℃ of all the other sections, extruded velocity 1000rpm, the melt of extruding is positioned in insulation can, and the insulation can temperature is controlled at 80 ℃; The melt compression moulding of single screw extrusion machine being extruded by the filter board mould press, first mould is adopted and be steam heated to 80 ℃, then the melt of extruding is dropped into compression moulding in filter board mould press mould, the pressing process parameter is: filter plate forming pressure 20MPa, dwell time is 0.5 hour, filter plate base after compacting is taken out put into forming machine 84 hours, take out again and flatten stress ageging in the warm water be placed into 45 ℃ and processed 72 hours, then lie in lower 180 hours of Normal Environmental Temperature as the filter plate work in-process;
At last with above-mentioned through ageing treatment, filter plate work in-process after keeping flat, by machining center, the filter plate two sides is processed and filter plate liquid in-out runner, equalizing port are processed into the filter plate finished product.
After tested, the filter plate salient features is: 148 ℃ of filter plate texturing temperatures, and tensile strength reaches 38MPa, flexural strength 43MPa, shock strength is 10. 5KJ/m
2, flawless under pressure 1.3MPa, the pressurize withstand voltage test of 10 minutes.
Embodiment 4:
(1) batching: take the each component raw material by following quality: 20g Graphite Powder 99,84g polypropylene, 20g glass fibre, 4.4g phase solvent, 1.6g maleic anhydride phase solvent, 3g surface treatment agent (1.5g rare earth aluminic acid ester recombiner and 1.5g titanic acid ester), 1g silane coupling agent, 4g oxidation inhibitor (1.6g phenolic antioxidant and 2.4g divalent sulfur compound);
(2) first Graphite Powder 99 and glass fibre are carried out respectively surface treatment, Graphite Powder 99 is put into high-speed mixer carry out the heat agitated heating, the heat agitated Heating temperature is 80 ℃, the heat agitated time is 18min, when reaching 90 ℃, Graphite Powder 99 heat agitated time of arrival and Graphite Powder 99 temperature drop into surface treatment agent rare earth aluminic acid fat recombiner and titanic acid ester in order in Graphite Powder 99, and heat agitated together with Graphite Powder 99, the Graphite Powder 99 temperature that will drop into simultaneously after surface treatment agent rises to 90 ℃, makes Graphite Powder 99 discharging after at the temperature of 90 ℃, heat agitated 15min carries out surface treatment; Use maleic anhydride phase solvent and silylation liquid coupling agent to carry out the surface in dried glass fibre again and soak processing, and dry under 130 ℃ of hot air circulation; Then PP, unsaturated carboxylic acid added and mixed at normal temperatures 8 minutes in high-speed mixer successively with PP grafts compatilizer, oxidation inhibitor, surface treated Graphite Powder 99, forming graphite/PP compound;
With above-mentioned graphite/PP compound and the glass fibre after the surface is soaked and dried through twin screw extruder melting, shearing, mixing, homogenizing, extrude, and tie rod and cooling, pelletizing form graphite modified enhancing PP particulate material, the expressing technique condition of twin screw extruder is: each section of extrusion temperature is 230 ℃, and extruded velocity is 350rpm;
The graphite modified enhancing PP particulate material that twin screw extruder is extruded is placed at the temperature of 110 ℃ and was carried out preheating and drying in 45 hours; Then with single screw extrusion machine, graphite modified enhancing PP particulate material is melt extruded, single screw extrusion machine expressing technique condition is: equal 220 ℃ of each section of extrusion temperature, extruded velocity 950rpm, the melt of extruding is positioned in insulation can, and the insulation can temperature is controlled at 110 ℃; The melt compression moulding of single screw extrusion machine being extruded by the filter board mould press, first mould is adopted and be steam heated to 58 ℃, then the melt of extruding is dropped into compression moulding in filter board mould press mould, the pressing process parameter is: filter plate forming pressure 10MPa, dwell time is 1.4 hours, filter plate base after compacting is taken out put into forming machine 95 hours, take out again and flatten stress ageging in the warm water be placed into 50 ℃ and processed 95 hours, then lie in lower 170 hours of Normal Environmental Temperature as the filter plate work in-process;
At last with above-mentioned through ageing treatment, filter plate work in-process after keeping flat, by machining center, the filter plate two sides is processed and filter plate liquid in-out runner, equalizing port are processed into the filter plate finished product.
After tested, 168 ℃ of filter plate salient features filter plate texturing temperatures, tensile strength reaches 39MPa,, flexural strength 44MPa, shock strength is 10. 5KJ/m
2, flawless under pressure 1.5MPa, the pressurize withstand voltage test of 10 minutes.
Embodiment 5:
(1) batching: take the each component raw material by following quality: 13g Graphite Powder 99,68g polypropylene, 15g glass fibre, 2.8g phase solvent, 1.2g maleic anhydride phase solvent, 2.4g surface treatment agent (rare earth aluminic acid ester recombiner 1.2g and 1.2g titanic acid ester), 0.6g silane coupling agent, 4g oxidation inhibitor (phenolic antioxidant 1.5g and divalent sulfur compound 2.5 g);
(2) first Graphite Powder 99 and glass fibre are carried out respectively surface treatment, Graphite Powder 99 is put into high-speed mixer carry out the heat agitated heating, the heat agitated Heating temperature is 80 ℃, the heat agitated time is 15min, when reaching 90 ℃, Graphite Powder 99 heat agitated time of arrival and Graphite Powder 99 temperature drop into surface treatment agent rare earth aluminic acid fat recombiner and titanic acid ester in order in Graphite Powder 99, and heat agitated together with Graphite Powder 99, the Graphite Powder 99 temperature that will add simultaneously after surface treatment agent rises to 90 ℃, makes Graphite Powder 99 discharging after at the temperature of 90 ℃, heat agitated 10min carries out surface treatment; Use maleic anhydride phase solvent and silylation liquid coupling agent to carry out the surface in dried glass fibre again and soak processing, and dry under 90 ℃ of hot air circulation; Then PP, unsaturated carboxylic acid added and mixed at normal temperatures 9 minutes in high-speed mixer successively with PP grafts compatilizer, oxidation inhibitor, surface treated Graphite Powder 99, forming graphite/PP compound;
With above-mentioned graphite/PP compound and the glass fibre after the surface is soaked and dried through twin screw extruder melting, shearing, mixing, homogenizing, extrude, and tie rod and cooling, pelletizing form graphite modified enhancing PP particulate material, the expressing technique condition of twin screw extruder is: extrusion temperature is 200 ℃ of feed zones, all the other each sections are 250 ℃, and extruded velocity is 350rpm;
The graphite modified enhancing PP particulate material that twin screw extruder is extruded is placed at the temperature of 75 ℃ and was carried out preheating and drying in 45 hours; Then with single screw extrusion machine, graphite modified enhancing PP particulate material is melt extruded, single screw extrusion machine expressing technique condition is: extrusion temperature is 230 ℃ of feed zones, 260 ℃ of all the other sections, extruded velocity 950rpm, the melt of extruding is positioned in insulation can, and the insulation can temperature is controlled at 130 ℃; The melt compression moulding of single screw extrusion machine being extruded by the filter board mould press, first mould is adopted and be steam heated to 56 ℃, then the melt of extruding is dropped into compression moulding in filter board mould press mould, the pressing process parameter is: filter plate forming pressure 10MPa, dwell time is 1.4 hours, filter plate base after compacting is taken out put into forming machine 95 hours, take out again and flatten stress ageging in the warm water be placed into 50 ℃ and processed 95 hours, then lie in lower 170 hours of Normal Environmental Temperature as the filter plate work in-process;
At last with above-mentioned through ageing treatment, filter plate work in-process after keeping flat, by machining center, the filter plate two sides is processed and filter plate liquid in-out runner, equalizing port are processed into the filter plate finished product.
After tested, 155 ℃ of filter plate salient features filter plate texturing temperatures, tensile strength reaches 42.5MPa, flexural strength 44MPa, shock strength is 10 .1KJ/m
2, the withstand voltage pressure of single face reaches 1.41MPa.
Above embodiment is all concrete exemplary applications of the present invention, for a person skilled in the art, makes the protection domain that simple replacement all belongs to claim of the present invention on the basis of above-described embodiment.
Claims (10)
1. polypropylene composite material filter plate, its composition comprises following component by mass: 50～80 parts of polypropylene, 5 ~ 20 parts of Graphite Powder 99s, 8 ~ 20 parts, glass fibre, 1～3.6 part of surface treatment agent, unsaturated carboxylic acid and 0.4～7.4 part of polyacrylic grafts phase solvent, 0.6～1.6 part of maleic anhydride phase solvent, 0.4～3 part of coupling agent, 1～4 part, oxidation inhibitor.
2. a kind of polypropylene composite material filter plate according to claim 1, it is characterized in that: described surface treatment agent comprises rare earth aluminic acid fat composite treating agent and titanic acid ester treatment agent.
3. a kind of polypropylene composite material filter plate according to claim 1, it is characterized in that: described coupling agent comprises one or more in rare earth aluminic acid fat composite coupler, titanate coupling agent, silylation coupling agent.
4. a kind of polypropylene composite material filter plate according to claim 1, it is characterized in that: described oxidation inhibitor comprises one or both mixing in phenolic antioxidant, divalent sulfur compound.
5. the preparation method of a kind of polypropylene composite material filter plate according to claim 1 comprises the following steps:
(1) take each raw material by mass fraction;
(2) Graphite Powder 99 is carried out high speed heat agitated heating, then surface treatment agent is dropped into and carry out discharging after surface treatment in Graphite Powder 99;
(3) glass fibre of drying is undertaken by maleic anhydride phase solvent and coupling agent that the surface is soaked and dries under 90～140 ℃ of hot air circulation;
(4) polypropylene, unsaturated carboxylic acid and polyacrylic grafts phase solvent, oxidation inhibitor and the Graphite Powder 99 of step (2) after surface treatment are added and carry out high-speed stirring in the high-speed mixer successively evenly form the Property of Graphite/PP compound;
(5) glass fibre after oven dry in Property of Graphite/PP compound in step (4) and step (3) is carried out melting, shearing, mixing, homogenizing in forcing machine, extrude and tie rod and cooling, pelletizing after obtain graphite modified Reinforced Polypropylene particle;
(6)) the graphite modified Reinforced Polypropylene particle with gained in step (5) carries out preheating and drying, dried graphite modified Reinforced Polypropylene particle is carried out melt extrude, and the melt of extruding is positioned over insulation in insulation can;
(7) filter board mould press, forming mould are carried out preheating after, the melt of extruding through insulation in step (6) is dropped into the filter board mould press and is pressed into the demoulding after the filter plate blank, then the filter plate blank is put into forming machine cooling, again the filter plate blank is taken out be placed into flatten stress ageging in warm water and process after, and keep flat at normal temperatures;
(8) the filter plate blank is processed into the filter plate finished product.
6. the preparation method of polypropylene composite material filter plate according to claim 5, it is characterized in that: in described step (2), Graphite Powder 99 carries out high speed heat agitated heating in high-speed mixer, the temperature of Graphite Powder 99 high speed heat agitated heating is 60～90 ℃, and the time of Graphite Powder 99 high speed heat agitated is 10～20min; Throw in surface treatment agent when the Graphite Powder 99 temperature reaches 85～120 ℃ in Graphite Powder 99, and keep high speed heat agitated state, carry out surface treatment when the Graphite Powder 99 temperature reaches 85～135 ℃, the surface treatment time is 10～20min.
7. the preparation method of polypropylene composite material filter plate according to claim 5, it is characterized in that: described step (4) high speed churning time is 8～15 minutes.
8. the preparation method of polypropylene composite material filter plate according to claim 5 is characterized in that: in described step (5), the extrusion temperature of forcing machine is 170～250 ℃, and extruded velocity is 250～350rpm.
9. the preparation method of polypropylene composite material filter plate according to claim 5 is characterized in that: in described step (6), the preheating and drying temperature is 60～100 ℃, and the time is 24～48 hours; The melt extrusion temperature is 170～260 ℃, and extruded velocity is 800～1200rpm; The insulation can temperature is 80～150 ℃.
10. the preparation method of polypropylene composite material filter plate according to claim 5, it is characterized in that: the pre-thermal recovery steam heating of forming mould of filter board mould press in described step (7), temperature is 30～80 ℃, the forming pressure of filter board mould press is 10～20MPa, and the compacting dwell time is 0.5 ~ 2 hour; In described forming machine, be 72 ~ 96 hours cooling time; It is to carry out in the warm water of 40～80 ℃ that described leveling stress ageging is processed, and the treatment time is 72～96 hours; Describedly keep flat the time and be at least more than 120 hours.
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| CN104231443A (en) * | 2014-10-14 | 2014-12-24 | 景津环保股份有限公司 | High temperature resistant polypropylene filter plate and preparation method thereof |
| CN105482248A (en) * | 2015-12-09 | 2016-04-13 | 重庆可益荧新材料有限公司 | Polypropylene composite material, and preparation method and applications thereof |
| CN106268096A (en) * | 2016-10-18 | 2017-01-04 | 合肥海宝节能科技有限公司 | The manufacture method of the filter screen of cleaner unit |
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| CN106633396A (en) * | 2016-12-15 | 2017-05-10 | 蒋建华 | Modified polypropylene composite material and preparation method thereof |
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