CN103113666B - Polypropylene composite material filter plate and preparation method thereof - Google Patents

Polypropylene composite material filter plate and preparation method thereof Download PDF

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Publication number
CN103113666B
CN103113666B CN201210553325.3A CN201210553325A CN103113666B CN 103113666 B CN103113666 B CN 103113666B CN 201210553325 A CN201210553325 A CN 201210553325A CN 103113666 B CN103113666 B CN 103113666B
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filter plate
graphite powder
graphite
temperature
polypropylene
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CN201210553325.3A
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CN103113666A (en
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汪统华
丁宏明
陈怀兵
徐东军
顾晶
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江苏苏东化工机械有限公司
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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

A kind of Polypropylene composite material filter plate and preparation method thereof

Technical field

The present invention relates to filter press filter board and manufacture field, be specifically related to one and 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

Now conventional filter press filter board material is made up of polypropylene and calcium carbonate, talcum powder or glass fibre etc., in the solid-liquid separation that the industries such as chemical industry are strong to high temperature, resistance to chemical attack especially, obviously apparent fitness value is strong, 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 used as filter press filter board material, due to graphite material, there is compared with other mineral based material the heat-resisting, corrosion-resistant of excellence and strengthen the property, because becoming the important source material of polypropylene composite materials.More existing researchs for graphite modified polypropylene material at present, exploitation and patent literature, explore and new product development as a kind of new material research, graphite modified polypropylene tubular reaction still is successfully utilized to substitute glassed steel reaction vessels, and research and development graphite modified polypropylene is as 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 it is obviously on the low side as performances such as its intensity of filter press filter board material, and still belong to blank for the graphite modified Reinforced Polypropylene new material research application aspect needed for filter press filter board, result in 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 be separated in its performance obviously not enough, have impact on its range of application, its work-ing life is shorter simultaneously, cost also increases greatly.

Summary of the invention

Making the deficiency of 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: polypropylene 50 ~ 80 parts, Graphite Powder 99 5 ~ 20 parts, 8 ~ 20 parts, glass fibre, surface treatment agent 1 ~ 3.6 part, unsaturated carboxylic acid and polyacrylic grafts phase solvent 0.4 ~ 7.4 part, maleic anhydride phase solvent 0.6 ~ 1.6 part, coupling agent 0.4 ~ 3 part, 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 comprise in rare earth aluminic acid fat composite coupler, titanate coupling agent, silane based coupling agents one or more.

Described oxidation inhibitor comprises one or both mixing in phenolic antioxidant, divalent.

The preparation method of a kind of Polypropylene composite material filter plate disclosed by the invention, comprises the following steps:

(1) each raw material is taken by mass fraction;

(2) Graphite Powder 99 is carried out high speed heat agitated heating, then surface treatment agent is dropped in Graphite Powder 99 and carry out discharging after surface treatment;

(3) glass fibre of drying carried out surface wet by maleic anhydride phase solvent and coupling agent and dry under 90 ~ 140 DEG C 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 successively and carry out high-speed stirring in high-speed mixer evenly form Property of Graphite/PP compound;

(5) glass fibre after drying in Property of Graphite/PP compound in step (4) and step (3) is carried out melting, shearing, mixing, homogenizing in an extruder, extrude and tie rod and cooling, obtain graphite modified Reinforced Polypropylene particle after pelletizing;

(6)) the graphite modified Reinforced Polypropylene particle of gained in step (5) is carried out preheating and drying, dried graphite modified Reinforced Polypropylene particle is carried out melt and extrudes, the melt extruded is positioned over insulation can inside holding;

(7) filter board mould press, forming mould are carried out preheating, melt of extruding through insulation in step (6) is dropped into filter board mould press and is pressed into the demoulding after filter plate blank, then filter plate blank is put into forming machine to cool, again the taking-up of filter plate blank is placed in warm water after carrying out the process of leveling stress ageging, and keeps flat at normal temperatures;

(8) filter plate blank is processed into 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 DEG C, and the time of Graphite Powder 99 high speed heat agitated is 10 ~ 20min; In Graphite Powder 99, throw in surface treatment agent when Graphite Powder 99 temperature reaches 85 ~ 120 DEG C, and keep high speed heat agitated state, carry out surface treatment when Graphite Powder 99 temperature reaches 85 ~ 135 DEG C, 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 DEG C, and extruded velocity is 250 ~ 350rpm.

In described step (6), preheating and drying temperature is 60 ~ 100 DEG C, and the time is 24 ~ 48 hours; Melt extrusion temperature is 170 ~ 260 DEG C, and extruded velocity is 800 ~ 1200rpm; Insulation can temperature is 80 ~ 150 DEG C.

In described step (7), the forming mould preheating of filter board mould press adopts steam heating, and temperature is 30 ~ 80 DEG C, 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, cooling time is 72 ~ 96 hours; The process of described leveling stress ageging carries out in the warm water of 40 ~ 80 DEG C, 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 enhance heat-resisting, the mechanical property of filter plate and the function of erosion resistance, impart filter plate in various degree and adapting to overall characteristic excellent under high temperature, high pressure, deep-etching condition;

(2) present invention employs graphite material and the specific surface treatment mode of glass fibre, polypropylene in combining main body alloy material, graphite, the characteristic of glass and surface effects, respectively surface treatment is carried out to Graphite Powder 99 and glass fibre, Graphite Powder 99 surface treatment adopts rare earth clad aluminum acid esters, titanic acid ester surface treatment agent, the surface of glass fibre adopts maleic anhydride phase solvent and silane coupling agent or silane coupling agent and rare earth clad aluminum acid esters recombiner, the coupling agent that titanic acid ester is composite, because the rare earth in rare earth composite coupler has unique outer shell structure and stronger coordination ability, not only there is parents' coupled action, also have and inorganic graphite, glass fibre or organic polypropylene ligand form ionic linkage, improve 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 improve inorganic materials graphite in alloy system, affinity between glass fibre GF and organic non-polar polypropylene, improve mutual linkage force, facilitate the physical bond of interfacial chemistry bonding and Van der Waals force between Property of Graphite/PP/glass fibre, optimize physical and chemical performance and the mechanical property of polypropylene composite material,

(3) the present invention adopt twin screw extruder extruding pelletization, single screw extrusion machine multistage mixingly to melt extrude, high-pressure molding technique and filter plate shaping after the multistage aging treatment process such as stress relief, effectively eliminate owing to producing internal stress in Polypropylene composite material filter plate forming process, guarantee the stabilized structure of filter plate, excellent performance, under temperature, pressure, the multiple condition of chemical corrosion, there is stronger adaptive faculty;

(4) high temperature resistant, the high-voltage performance of product of the present invention strengthens, and heat resistance is than conventional filter plate by larger improve, and use range is wider, have stronger than existing filter press filter board chemical resistance, under comparatively high temps, elevated pressures condition, filter plate long service life, reduces maintenance cost;

(5) cost performance of filter plate of the present invention is high, can recycling completely, accomplishes pollution-free at links.

In sum, graphite modified reinforced polypropylene compound material of the present invention, compared with existing common filter plate, has high temperature resistant, resistance to chemical corrosion and excellent physical mechanical property.Under the formula composition through optimizing and preparation process condition, filter plate thermotolerance can reach 120 ~ 180 DEG C, 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 expand range of application.

Embodiment

Below by specific embodiment, further illustrate feature of the present invention.

Embodiment 1:

(1) prepare burden: take each component raw material by following quality: (model is GFS-4 to 13g Graphite Powder 99, 3 μ), 68g polypropylene (model is 045), (model is T738 or 988 to 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 (1.2g model is the rare earth aluminic acid ester recombiner of DL-2 and 1.2g model is the titanic acid ester of JTW-101), 0.6g model is the silane coupling agent of KH550, 3g oxidation inhibitor (model be 1010 phenolic antioxidant and model be the divalent of DSTP or DLTP, the ratio of phenolic antioxidant and divalent is 1/1.5),

(2) first respectively surface treatment is carried out to Graphite Powder 99 and glass fibre, Graphite Powder 99 is put into high-speed mixer and carries out heat agitated heating, heat agitated Heating temperature is 80 DEG C, the heat agitated time is 15min, in Graphite Powder 99, surface treatment agent rare earth aluminic acid fat recombiner and titanic acid ester is dropped in order when Graphite Powder 99 heat agitated time of arrival and Graphite Powder 99 temperature reach 95 DEG C, and heat agitated together with Graphite Powder 99, rising to 110 DEG C by dropping into the Graphite Powder 99 temperature after surface treatment agent simultaneously, making Graphite Powder 99 heat agitated 12min at the temperature of 110 DEG C carry out discharging after surface treatment; Use maleic anhydride phase solvent and silylation liquid coupling agent to carry out surface wet process in dried glass fibre again, and dry under 120 DEG C of hot air circulation; Then PP, unsaturated carboxylic acid added successively with PP grafts compatilizer, oxidation inhibitor, surface treated Graphite Powder 99 in high-speed mixer and mix 10 minutes at normal temperatures, forming graphite/PP compound;

By above-mentioned graphite/PP compound and through surface wet and dry after glass fibre through twin screw extruder (Nanjing Rubber & Plastics Machinery Plant Co., Ltd., model is the shearing mixing discharge type twin screw extruder of the multifunctional building-block of SJSH-65) melting, shearing, mixing, homogenizing, to 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 feed zone 180 DEG C, all the other each section is 230 DEG C, and extruded velocity is 320rpm;

The graphite modified enhancing PP particulate material extruded by twin screw extruder is placed and is carried out preheating and drying in 36 hours at the temperature of 80 DEG C; Then single screw extrusion machine (Wuxi rubber and plastics machine Co., Ltd., Factory is used, 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 feed zone 230 DEG C, all the other sections 260 DEG C, extruded velocity 900rpm, the melt extruded is positioned in insulation can, and insulation can temperature controls at 125 DEG C; The melt compression moulding of single screw extrusion machine being extruded by filter board mould press, first mould is adopted and be steam heated to 55 DEG C, then the melt extruded is dropped into compression moulding in filter board mould press die, pressing process parameter is: filter plate forming pressure 18MPa, dwell time is 1.2 hours, filter plate base after compacting is taken out and puts into forming machine 96 hours, take out again and be placed in the warm water of 45 DEG C and carry out leveling stress ageging process 96 hours, then lie in lower 120 hours of Normal Environmental Temperature as filter plate work in-process;

Finally by above-mentioned through Wetted constructures, keep flat after filter plate work in-process, by machining center filter plate two sides to be processed and filter plate liquid in-out runner, equalizing port are processed into filter plate finished product.

After tested, filter plate salient features is: filter plate texturing temperature 178 DEG C, 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) prepare burden: take 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, the ratio of phenolic antioxidant and divalent for be 1/1.2);

(2) first respectively surface treatment is carried out to Graphite Powder 99 and glass fibre, Graphite Powder 99 is put into high-speed mixer and carries out heat agitated heating, heat agitated Heating temperature is 85 DEG C, the heat agitated time is 20min, in Graphite Powder 99, surface treatment agent rare earth aluminic acid fat recombiner and titanic acid ester is dropped in order when Graphite Powder 99 heat agitated time of arrival and Graphite Powder 99 temperature reach 90 DEG C, and heat agitated together with Graphite Powder 99, rising to 120 DEG C by dropping into the Graphite Powder 99 temperature after surface treatment agent simultaneously, making Graphite Powder 99 heat agitated 10min at the temperature of 120 DEG C carry out discharging after surface treatment; Use maleic anhydride phase solvent and silylation liquid coupling agent to carry out surface wet process in dried glass fibre again, and dry under 120 DEG C of hot air circulation; Then PP, unsaturated carboxylic acid added successively with PP grafts compatilizer, oxidation inhibitor, surface treated Graphite Powder 99 in high-speed mixer and mix 15 minutes at normal temperatures, forming graphite/PP compound;

By above-mentioned graphite/PP compound and the glass fibre through surface wet and after drying 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 feed zone 170 DEG C, all the other each section is 220 DEG C, and extruded velocity is 350rpm;

The graphite modified enhancing PP particulate material extruded by twin screw extruder is placed and is carried out preheating and drying in 24 hours at the temperature of 120 DEG C; 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 feed zone 180 DEG C, all the other sections 210 DEG C, extruded velocity 800rpm, the melt extruded is positioned in insulation can, and insulation can temperature controls at 150 DEG C; The melt compression moulding of single screw extrusion machine being extruded by filter board mould press, first mould is adopted and be steam heated to 30 DEG C, then the melt extruded is dropped into compression moulding in filter board mould press die, pressing process parameter is: filter plate forming pressure 15MPa, dwell time is 2 hours, filter plate base after compacting is taken out and puts into forming machine 72 hours, take out again and be placed in the warm water of 50 DEG C and carry out leveling stress ageging process 72 hours, then lie in lower 150 hours of Normal Environmental Temperature as filter plate work in-process;

Finally by above-mentioned through Wetted constructures, keep flat after filter plate work in-process, adopt machining center to process filter plate two sides and filter plate liquid in-out runner, equalizing port are processed into filter plate finished product.

After tested, filter plate salient features is: filter plate texturing temperature 168 DEG C, 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) prepare burden: take 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 0.6g);

(2) first respectively surface treatment is carried out to Graphite Powder 99 and glass fibre, Graphite Powder 99 is put into high-speed mixer and carries out heat agitated heating, heat agitated Heating temperature is 90 DEG C, the heat agitated time is 20min, in Graphite Powder 99, surface treatment agent rare earth aluminic acid fat recombiner and titanic acid ester is dropped in order when Graphite Powder 99 heat agitated time of arrival and Graphite Powder 99 temperature reach 100 DEG C, and heat agitated together with Graphite Powder 99, rising to 120 DEG C by dropping into the Graphite Powder 99 temperature after surface treatment agent simultaneously, making Graphite Powder 99 heat agitated 15min at the temperature of 120 DEG C carry out discharging after surface treatment; Use maleic anhydride phase solvent and silylation liquid coupling agent to carry out surface wet process in dried glass fibre again, and dry under 120 DEG C of hot air circulation; Then PP, unsaturated carboxylic acid added successively with PP grafts compatilizer, oxidation inhibitor, surface treated Graphite Powder 99 in high-speed mixer and mix 8 minutes at normal temperatures, forming graphite/PP compound;

By above-mentioned graphite/PP compound and the glass fibre through surface wet and after drying 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 feed zone 230 DEG C, all the other each section is 250 DEG C, and extruded velocity is 280rpm;

The graphite modified enhancing PP particulate material extruded by twin screw extruder is placed and is carried out preheating and drying in 24 hours at the temperature of 60 DEG C; 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 feed zone 250 DEG C, all the other sections 260 DEG C, extruded velocity 1000rpm, the melt extruded is positioned in insulation can, and insulation can temperature controls at 80 DEG C; The melt compression moulding of single screw extrusion machine being extruded by filter board mould press, first mould is adopted and be steam heated to 80 DEG C, then the melt extruded is dropped into compression moulding in filter board mould press die, pressing process parameter is: filter plate forming pressure 20MPa, dwell time is 0.5 hour, filter plate base after compacting is taken out and puts into forming machine 84 hours, take out again and be placed in the warm water of 45 DEG C and carry out leveling stress ageging process 72 hours, then lie in lower 180 hours of Normal Environmental Temperature as filter plate work in-process;

Finally by above-mentioned through Wetted constructures, keep flat after filter plate work in-process, by machining center filter plate two sides to be processed and filter plate liquid in-out runner, equalizing port are processed into filter plate finished product.

After tested, filter plate salient features is: filter plate texturing temperature 148 DEG C, and tensile strength reaches 38MPa, flexural strength 43MPa, and shock strength is 10. 5KJ/m 2, flawless under pressure 1.3MPa, the pressurize withstand voltage test of 10 minutes.

Embodiment 4:

(1) prepare burden: take 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);

(2) first respectively surface treatment is carried out to Graphite Powder 99 and glass fibre, Graphite Powder 99 is put into high-speed mixer and carries out heat agitated heating, heat agitated Heating temperature is 80 DEG C, the heat agitated time is 18min, in Graphite Powder 99, surface treatment agent rare earth aluminic acid fat recombiner and titanic acid ester is dropped in order when Graphite Powder 99 heat agitated time of arrival and Graphite Powder 99 temperature reach 90 DEG C, and heat agitated together with Graphite Powder 99, rising to 90 DEG C by dropping into the Graphite Powder 99 temperature after surface treatment agent simultaneously, making Graphite Powder 99 heat agitated 15min at the temperature of 90 DEG C carry out discharging after surface treatment; Use maleic anhydride phase solvent and silylation liquid coupling agent to carry out surface wet process in dried glass fibre again, and dry under 130 DEG C of hot air circulation; Then PP, unsaturated carboxylic acid added successively with PP grafts compatilizer, oxidation inhibitor, surface treated Graphite Powder 99 in high-speed mixer and mix 8 minutes at normal temperatures, forming graphite/PP compound;

By above-mentioned graphite/PP compound and the glass fibre through surface wet and after drying 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 DEG C, and extruded velocity is 350rpm;

The graphite modified enhancing PP particulate material extruded by twin screw extruder is placed and is carried out preheating and drying in 45 hours at the temperature of 110 DEG C; 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 DEG C of each section of extrusion temperature, extruded velocity 950rpm, the melt extruded is positioned in insulation can, and insulation can temperature controls at 110 DEG C; The melt compression moulding of single screw extrusion machine being extruded by filter board mould press, first mould is adopted and be steam heated to 58 DEG C, then the melt extruded is dropped into compression moulding in filter board mould press die, pressing process parameter is: filter plate forming pressure 10MPa, dwell time is 1.4 hours, filter plate base after compacting is taken out and puts into forming machine 95 hours, take out again and be placed in the warm water of 50 DEG C and carry out leveling stress ageging process 95 hours, then lie in lower 170 hours of Normal Environmental Temperature as filter plate work in-process;

Finally by above-mentioned through Wetted constructures, keep flat after filter plate work in-process, by machining center filter plate two sides to be processed and filter plate liquid in-out runner, equalizing port are processed into filter plate finished product.

After tested, filter plate salient features filter plate texturing temperature 168 DEG C, 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) prepare burden: take 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 are (phenolic antioxidant 1.5g and divalent 2.5 g);

(2) first respectively surface treatment is carried out to Graphite Powder 99 and glass fibre, Graphite Powder 99 is put into high-speed mixer and carries out heat agitated heating, heat agitated Heating temperature is 80 DEG C, the heat agitated time is 15min, in Graphite Powder 99, surface treatment agent rare earth aluminic acid fat recombiner and titanic acid ester is dropped in order when Graphite Powder 99 heat agitated time of arrival and Graphite Powder 99 temperature reach 90 DEG C, and heat agitated together with Graphite Powder 99, rising to 90 DEG C by adding the Graphite Powder 99 temperature after surface treatment agent simultaneously, making Graphite Powder 99 heat agitated 10min at the temperature of 90 DEG C carry out discharging after surface treatment; Use maleic anhydride phase solvent and silylation liquid coupling agent to carry out surface wet process in dried glass fibre again, and dry under 90 DEG C of hot air circulation; Then PP, unsaturated carboxylic acid added successively with PP grafts compatilizer, oxidation inhibitor, surface treated Graphite Powder 99 in high-speed mixer and mix 9 minutes at normal temperatures, forming graphite/PP compound;

By above-mentioned graphite/PP compound and the glass fibre through surface wet and after drying 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 feed zone 200 DEG C, all the other each section is 250 DEG C, and extruded velocity is 350rpm;

The graphite modified enhancing PP particulate material extruded by twin screw extruder is placed and is carried out preheating and drying in 45 hours at the temperature of 75 DEG C; 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 feed zone 230 DEG C, all the other sections 260 DEG C, extruded velocity 950rpm, the melt extruded is positioned in insulation can, and insulation can temperature controls at 130 DEG C; The melt compression moulding of single screw extrusion machine being extruded by filter board mould press, first mould is adopted and be steam heated to 56 DEG C, then the melt extruded is dropped into compression moulding in filter board mould press die, pressing process parameter is: filter plate forming pressure 10MPa, dwell time is 1.4 hours, filter plate base after compacting is taken out and puts into forming machine 95 hours, take out again and be placed in the warm water of 50 DEG C and carry out leveling stress ageging process 95 hours, then lie in lower 170 hours of Normal Environmental Temperature as filter plate work in-process;

Finally by above-mentioned through Wetted constructures, keep flat after filter plate work in-process, by machining center filter plate two sides to be processed and filter plate liquid in-out runner, equalizing port are processed into filter plate finished product.

After tested, filter plate salient features filter plate texturing temperature 155 DEG C, tensile strength reaches 42.5MPa, flexural strength 44MPa, and shock strength is 10 .1KJ/m 2, the resistance to pressure pressure of one side reaches 1.41MPa.

Above embodiment is all embody rule examples of the present invention, for a person skilled in the art, the basis of above-described embodiment is made the protection domain that simple replacement all belongs to the claims in the present invention.

Claims (1)

1. the preparation method of a Polypropylene composite material filter plate, its composition comprises following component by mass: Graphite Powder 99 13g, 045 polypropylene 68g, T738 or 988 glass fibre 15g, model is the PP-g-MAH compatilizer 2.8g of GP715, maleic anhydride compatilizer 1.2g, the surface treatment agent 2.4g be made up of the titanic acid ester 1.2g of model to be the rare earth aluminic acid ester recombiner 1.2g of DL-2 and model be JTW-101, model is the silane coupling agent 0.6g of KH550, model is the oxidation inhibitor 3g that mixes with 1/1.5 ratio of phenolic antioxidant and the model divalent that is DSTP or DLTP of 1010,
First respectively surface treatment is carried out to Graphite Powder 99 and glass fibre, Graphite Powder 99 is put into high-speed mixer and carries out heat agitated heating, heat agitated Heating temperature is 80 DEG C, the heat agitated time is 15min, in Graphite Powder 99, surface treatment agent rare earth aluminic acid ester recombiner and titanic acid ester is dropped in order when Graphite Powder 99 heat agitated time of arrival and Graphite Powder 99 temperature reach 95 DEG C, and heat agitated together with Graphite Powder 99, rising to 110 DEG C by dropping into the Graphite Powder 99 temperature after surface treatment agent simultaneously, making Graphite Powder 99 heat agitated 12min at the temperature of 110 DEG C carry out discharging after surface treatment; Use maleic anhydride compatilizer and silylation liquid coupling agent to carry out surface wet process in dried glass fibre again, and dry under 120 DEG C of hot air circulation; Then polypropylene, unsaturated carboxylic acid added successively with Graft Polypropylene compatilizer, oxidation inhibitor, surface treated Graphite Powder 99 in high-speed mixer and mix 10 minutes at normal temperatures, forming Property of Graphite/PP compound;
By above-mentioned Property of Graphite/PP compound and the glass fibre through surface wet and after drying through twin screw extruder melting, shearing, mixing, homogenizing, extrude, and tie rod and cooling, pelletizing form graphite modified Reinforced Polypropylene particulate material, the expressing technique condition of twin screw extruder is: extrusion temperature is feed zone 180 DEG C, all the other each section is 230 DEG C, and extruded velocity is 320rpm;
The graphite modified Reinforced Polypropylene particulate material extruded by twin screw extruder is placed and is carried out preheating and drying in 36 hours at the temperature of 80 DEG C; Then with single screw extrusion machine, graphite modified Reinforced Polypropylene particulate material is melt extruded, single screw extrusion machine expressing technique condition is: extrusion temperature is feed zone 230 DEG C, all the other sections 260 DEG C, extruded velocity 900rpm, the melt extruded is positioned in insulation can, and insulation can temperature controls at 125 DEG C; The melt compression moulding of single screw extrusion machine being extruded by filter board mould press, first mould is adopted and be steam heated to 55 DEG C, then the melt extruded is dropped into compression moulding in filter board mould press die, pressing process parameter is: filter plate forming pressure 18MPa, dwell time is 1.2 hours, filter plate base after compacting is taken out and puts into forming machine 96 hours, take out again and be placed in the warm water of 45 DEG C and carry out leveling stress ageging process 96 hours, then lie in lower 120 hours of Normal Environmental Temperature as filter plate work in-process;
Finally by above-mentioned through Wetted constructures, keep flat after filter plate work in-process, by machining center filter plate two sides to be processed and filter plate liquid in-out runner, equalizing port are processed into filter plate finished product.
CN201210553325.3A 2012-12-19 2012-12-19 Polypropylene composite material filter plate and preparation method thereof CN103113666B (en)

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