CN101875234A - Preparation process of polypropylene diaphragm for pressure filter - Google Patents
Preparation process of polypropylene diaphragm for pressure filter Download PDFInfo
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- CN101875234A CN101875234A CN201010132993XA CN201010132993A CN101875234A CN 101875234 A CN101875234 A CN 101875234A CN 201010132993X A CN201010132993X A CN 201010132993XA CN 201010132993 A CN201010132993 A CN 201010132993A CN 101875234 A CN101875234 A CN 101875234A
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Abstract
The invention relates to a preparation process of a polypropylene diaphragm for a pressure filter. The preparation process comprises the following steps of: step one, preparing a modified ethylene-octene in-situ copolymer elastomer for the diaphragm; step two, mixing the modified ethylene-octene in-situ copolymer elastomer, co-polypropylene and an auxiliary agent to prepare a finished product particle material, and preparing the finished product particle material into a blank diaphragm; and step three, baking and laminating the blank diaphragm with a main body core plate to form a polypropylene diaphragm filter plate for the pressure filter. The preparation process has the significant and substantial characteristics that: the polypropylene diaphragm prepared by the preparation process has good combination properties such as tensile strength, elongation at break, tenacity and the like when the blend ratio of a modified POE elastomer to PPRA130E is from 40/60 to 50/50; the preparation process can prepare a transparent polypropylene diaphragm, and can prepare diaphragms with different colors according to actual needs of customers; besides, the material utilization is reasonable to reduce wastes.
Description
[affiliated technical field]
The present invention relates to a kind of preparation technology who prepares polypropylene diaphragm, relate in particular to the preparation technology of a kind of filter press, the diaphragm good toughness of its preparation, intensity height with polypropylene diaphragm.
[background technology]
Existing filter press filter board diaphragm mainly adopts elastomeric material or polypropylene to add the material that excellent energy glue (EPDM) mixes generation.The diaphragm good toughness of rubber material, but intensity difference, and heatproof not, corrosion resistance is also poor, so the scope of application is restricted.Adopt polypropylene to add the diaphragm poor toughness that EPDM produces, intensity also not so good (because the compatibility between them is poor), diaphragm deformation or badly broken in the use, service life is short.
[summary of the invention]
The object of the present invention is to provide the preparation technology of a kind of filter press with polypropylene diaphragm, the diaphragm good toughness of its preparation, intensity height solve the problems referred to above that the prior art scheme exists.
The present invention solves the technical scheme that the prior art problem adopted: a kind of filter press is characterized in that: step 1 with the preparation technology of polypropylene diaphragm: the preparation diaphragm is with ethene improved-octene in-situ copolymerization thing elastomer (being modification POE elastomer); Step 2: ethene improved-octene in-situ copolymerization thing elastomer, COPP (PPR), auxiliary agent are mixed and made into the finished product pellet, the finished product pellet is made base diaphragm just; Step 3: first base diaphragm and the baking of main body central layer are fitted, form the filter press polypropylene diaphragm filter-plate.Material in the modification POE elastomer for preparing in the step 1 is even, so performance is also even.Carry out step 2 when operation, various material mixed meltings more even, the performance of the novel substance that modification POE elastomer and PPR produce under the effect of auxiliary agent is also even.Wherein, modification POE elastomer and PPR are respectively applied for toughness and the intensity that strengthens final products (diaphragm).The step of the selection of various stocks, the ratio of mixing, mixing and the uniformity coefficient that mixes play conclusive effect to the performance of final products (diaphragm).
As further improving and replenishing to technique scheme, the present invention adopts following technical measures: the operation of described step 1: by weight: the ethylene-octene in-situ copolymerization thing (POE) of 60-70 part, the COPP of 30-40 part, the first auxiliary agent of 0.6-10.2 part are mixed stirring, mediate to form diaphragm with ethene improved-octene in-situ copolymerization thing elastomer through mixing roll, extrude pelletizing through dual-screw-stem machine again, final drying.
The operation of described step 2: by weight: the second auxiliary agent of the ethene improved-octene in-situ copolymerization thing elastomer of 55-65 part that step 1 is made, the COPP of 35-45 part, 0.1-0.5 part mixes and stirs, extrude through dual-screw-stem machine, repressed back forms base diaphragm just.Material after the fusion (transparency material) can be simplified production process if extrude directly compression moulding of back from dual-screw-stem machine, and reduces after the material cooling energy that heating and melting compacting is again consumed.But, operation so perfectly, because, in actual applications, sometimes the client need select the diaphragm of different colours for use, needs to add color masterbatch, if directly add in the dual-screw-stem machine, then need more dual-screw-stem machine, and the actual amount of diaphragm material is not easy control, in addition, needs the more dual-screw-stem machine of configuration, and dual-screw-stem machine purchasing price costliness will significantly increase the production cost of enterprise.
Therefore, the operation of described step 2 can also comprise: after dual-screw-stem machine is extruded, cooling earlier, pelletizing forms the finished product pellet, the finished product pellet is detected, after qualified, again the finished product pellet is melt extruded through single-screw machine, keep the temperature of extrudate, transfer to compacting, cooling and shaping in the hydraulic press again, form base transparent membrane just.Sometimes the client need select the diaphragm of different colours for use, and finished product pellet and color masterbatch are added the single-screw machine mixed melting, again by hydraulic press compression moulding.Because single-screw machine declines to a great extent than the purchase cost of dual-screw-stem machine, also reduced enterprise's production cost.
When the finished product pellet is sent into the single-screw machine fusion, not only can produce the septum pellucidum diaphragm, but also can in single-screw machine, add color masterbatch and pellet mixed melting, extrude colored extrudate.
The operation of described step 2 also comprises: described base diaphragm is just milled to specific thickness through the disk plate-milling machine.Because the diaphragm of hydraulic press compression moulding is base just, rough surface can't be directly and main body central layer baking subsides, by the system of milling of disk plate-milling machine, makes the surface (comprise and dry by the fire veneer and sealing surface) of diaphragm smooth smooth.
By weight, described first auxiliary agent comprises: the compatilizer of 1-2 part, described compatilizer are graft polypropylene.Compatilizer makes POE and full and uniform being fused together of PPR, produces the POE elastomer of novel substance modification.
By weight, described second auxiliary agent comprises: the lubricant of 0.1-0.5 part, described lubricant are paraffin or stearic acid.
The draw ratio of described dual-screw-stem machine is (30-35): 1, and barrel temperature is controlled at 170 ℃-200 ℃, and rotating speed is 140r/min-180r/min.Lubricant makes the material surface that produces after the fusion smooth, and reduces the friction to equipment, the service life of improving equipment.
The draw ratio of described single-screw machine is (28-33): 1, and barrel temperature is controlled at 170 ℃-200 ℃, and rotating speed is 30r/min-70r/min; The pressure of described hydraulic press is 400t-600t, suppress through hydraulic press, baking veneer on the described base diaphragm just is 28.5mm-29.5mm to the distance of sealing surface, filtering area in the diaphragm comprises two respectively with baking veneer and the corresponding filtering surface of sealing surface with stand on the filter post (or cry filter beans) of a filtering surface at least, and the distance between two filtering surfaces is 5.5mm-6.5mm; After the disk plate-milling machine milled system, the baking veneer was 23.6mm-24.4mm to the distance of sealing surface with first base diaphragm.
The outstanding substantive distinguishing features that the present invention has: the polypropylene diaphragm that adopts this preparation technology to make, when modification POE elastomer/when the PPRA130E blending ratio is 40/60 to 50/50, good combination properties such as hot strength, elongation rate of tensile failure, hardness, toughness; Adopt this preparation technology can make transparent polypropylene diaphragm, also can be prepared into versicolor diaphragm, and reasonable utilization of materials cuts the waste according to client's actual needs.
[description of drawings]
Fig. 1 is for making the cross-sectional structure schematic diagram of diaphragm among the present invention.
Fig. 2 is the graph of a relation of modification POE elastomer different amounts of the present invention to special-purpose POE elastomer and PPRA130E co-mixing system mechanical performance.
[specific embodiment]
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Embodiment: a kind of filter press is with the preparation technology of polypropylene diaphragm, step 1: the preparation diaphragm is with ethene improved-octene in-situ copolymerization thing elastomer (being modification POE elastomer); Step 2: ethene improved-octene in-situ copolymerization thing elastomer (being modification POE elastomer), COPP (PPR), auxiliary agent are mixed and made into the finished product pellet, the finished product pellet is made base diaphragm just; Step 3: first base diaphragm and the baking of main body central layer are fitted, form the filter press polypropylene diaphragm.To adopt the general trade mark be the material of PPRA130E to COPP in the preparation process.
The operation of step 1: by weight: the ethylene-octene in-situ copolymerization thing (POE) of 60-70 part, the COPP (PPR) of 30-40 part, the first auxiliary agent of 0.6-10.2 part are mixed stirring, mediate to form diaphragm with ethene improved-octene in-situ copolymerization thing elastomer through mixing roll, extrude pelletizing through dual-screw-stem machine again, final drying.By weight, the first auxiliary agent comprises: the compatilizer of 1-2 part.Generally, compatilizer is a graft polypropylene.By the interpolation of compatilizer, POE and PPR are fused together very uniformly, improved the elastomeric combination property of modification POE.
The operation of step 2: by weight: the second auxiliary agent of the ethene improved-octene in-situ copolymerization thing elastomer (being modification POE elastomer) of 55-65 part that step 1 is made, the COPP (PPR) of 35-45 part, 0.1-0.5 part mixes and stirs, extrude through dual-screw-stem machine, repressed back forms base diaphragm just.By weight, the second auxiliary agent comprises: the lubricant of 0.1-0.5 part.Lubricant is paraffin or stearic acid.Lubricant makes the material surface that produces after the fusion smooth, and reduces the friction to equipment, the service life of improving equipment.After dual-screw-stem machine is extruded, can enter hydraulic press compression moulding at once, help reducing the configuration of equipment on the one hand, also need not cut down the consumption of energy in addition to heating again after the final fused mass cooling.But, the customer demand that has, needs are produced the diaphragm of different colours, then need the material after the fusion from dual-screw-stem machine is added pigment, because dual-screw-stem machine output is big, wayward output is easy to generate the waste of material.Therefore, step 2 is increased following operation: after dual-screw-stem machine is extruded, cooling earlier, pelletizing forms the finished product pellet, the finished product pellet is detected, after qualified, again the finished product pellet is melt extruded through single-screw machine, keep the temperature of extrudate, transfer to compacting, cooling and shaping in the hydraulic press again, form base diaphragm just.Also can, the material pelletizing cooling of coming out from dual-screw-stem machine, again by the single-screw machine fusion, at this moment, can but add pigment (can certainly not add pigment, specifically decide) in the single-screw machine according to actual conditions.When needing to add pigment, when the finished product pellet is sent into the single-screw machine fusion, in single-screw machine, add color masterbatch and pellet mixed melting, extrude colored extrudate.Colored extrudate is after hydraulic press compression moulding.
Generally, through the first base diaphragm of hydraulic press compression moulding, the surface is more coarse, can't stick together with the baking of main body central layer at once, and therefore, the operation of step 2 also comprises: described base diaphragm is just milled to specific thickness through the disk plate-milling machine.The pressure of hydraulic press is that (conventional pressure is 500t to 400t-600t, t is ton), suppress through hydraulic press, just the baking veneer on the base diaphragm is 28.5mm-29.5mm (regular situation is 29mm) to sealing surface apart from a, filtering area in the diaphragm comprises two respectively with baking veneer 1 and sealing surface 4 corresponding filtering surfaces 2 with stand on the filter post 3 (or cry and filter beans) of a filtering surface 2, and the distance b between two filtering surfaces 2 is 5.5mm-6.5mm (regular situation is 6mm); After the disk plate-milling machine milled system, baking veneer 1 was 23.6mm-24.4mm (regular situation is 24mm) to sealing surface 4 apart from a with first base diaphragm.As shown in Figure 1.Above-mentioned numeral has only specifically been given an example and has been produced a kind of size of specification diaphragm, and the application not only protects above-mentioned size, and the diaphragm of other sizes adopts this preparation technology, can produce the diaphragm with quality equally.
The draw ratio of dual-screw-stem machine is (30-35): 1 (regular situation is 32: 1), barrel temperature are controlled at 170 ℃-200 ℃, and rotating speed is 140r/min-180r/min (regular situation is 150r/min).The draw ratio of single-screw machine is (28-33): 1 (regular situation is 30: 1), barrel temperature are controlled at 170 ℃-200 ℃, and rotating speed is 30r/min-70r/min (regular situation is 50r/min).
To the diaphragm that adopts above-mentioned preparation technology to make, further discuss:
The compressive resistance of diaphragm test: get PPRA130E and modification POE elastomer is made the finished product pellet, melt extrude with single screw extrusion machine, extrusion capacity is 18kg, the die cavity that is transferred to the X800 mould is interior with the compression molding of 500t hydraulic press, the baking veneer is controlled at 29mm ± 0.5mm to sealing surface apart from a, and the distance b between two filtering surfaces is 6mm.Behind the cooling and shaping, will dry by the fire veneer milling to 24mm to sealing surface apart from a with the disk plate-milling machine.Process 4 diaphragms (being numbered P1, P2 and P3, P4) altogether, paste into two blocks of polypropylene (PP) membrane filter plate with the baking of main body central layer respectively again and use in order to proof strength.
With 4 diaphragms (being numbered E1, E2 and E3, E4) of above-mentioned same method processing (adopting PPRA130E and EPDM elastomer configuration preparation diaphragm), paste into two PP membrane filter plates with the baking of main body central layer respectively again and use in order to proof strength.
Above sample P P membrane filter plate is carried out the single face look press test, it the results are shown in following table 1:
Table 1
| The diaphragm numbering | The flexibilizer title | Diaphragm thickness | Pressure when breaking | Test(ing) medium |
| ??P1、P2 | ??POE | ??6mm | ??2.50MPa | Water |
| ??P3、P4 | ??POE | ??6mm | ??2.58MPa | Water |
[0028]
| ??E1、E2 | ??EPDM | ??6mm | ??1.82MPa | Water |
| ??E3、E4 | ??EPDM | ??6mm | ??1.85MPa | Water |
As technique scheme is further proved, transparent polypropylene diaphragm correlated performance to be tested, its test result is hot strength 18.3～24.3Mpa (being undertaken by GB/T528-1998); Bending strength 28.3～30.5Mpa; Elongation at break 〉=500% (being undertaken) by GB/T528-1998; Notched Izod impact strength 500～750J/m; 98～105 ℃ of heat distortion temperatures.Main test apparatus: durometer, Shao Shi A, Shanghai perilous peak film machinery plant; The HD-10 thickness gauge, Shanghai chemical machine factory; Tensile testing machine, AI-1000M, high ferro Science and Technology Co., Ltd..The air pressure automatic clinical microtome, GT-7016-AR, High Speed Rail Testing Instruments Co., Ltd.
Rubber and plastic comparison modification POE elastomer and polypropylene (PP) co-mixing system Effect on Performance
This test is a continuous phase with modification POE elastomer, with PPRA130E is decentralized photo, test the performance of different rubber and plastics than blend compound system, be variable with modification POE elastomer and PPRA130E in the basic recipe, in Fig. 2, modification POE elastomer different amounts is to the influence of special-purpose POE elastomer and PPRA130E co-mixing system mechanical performance:
As seen from Figure 2, with the increase gradually of modification POE elastomer consumption, the hot strength of compound system reduces gradually.And elongation rate of tensile failure increases.This is that blend intensity is just big more because in co-mixing system, the hot strength of polypropylene itself and hardness play humidification just than higher in system, so the polypropylene consumption is big more, and hardness is just high more; And modification POE is a kind of toughness material as rubber phase, plays toughening effect in system, and hot strength is lower.Therefore when modification POE elastomer/when the PPRA130E blending ratio was 40/60 to 50/50, co-mixing system had better comprehensive performance.
Claims (10)
1. a filter press is characterized in that: step 1 with the preparation technology of polypropylene diaphragm: the preparation diaphragm is with ethene improved-octene in-situ copolymerization thing elastomer; Step 2: ethene improved-octene in-situ copolymerization thing elastomer, COPP, auxiliary agent are mixed and made into the finished product pellet, the finished product pellet is made base diaphragm just; Step 3: first base diaphragm and the baking of main body central layer are fitted, form the filter press polypropylene diaphragm filter-plate.
2. a kind of filter press according to claim 1 preparation technology of polypropylene diaphragm, the operation that it is characterized in that described step 1: by weight: the ethylene-octene in-situ copolymerization thing of 60-70 part, the COPP of 30-40 part, the first auxiliary agent of 0.6-10.2 part are mixed stirring, mediate to form diaphragm with ethene improved-octene in-situ copolymerization thing elastomer through mixing roll, extrude pelletizing through dual-screw-stem machine again, final drying.
3. a kind of filter press according to claim 1 and 2 preparation technology of polypropylene diaphragm, the operation that it is characterized in that described step 2: by weight: the second auxiliary agent of the ethene improved-octene in-situ copolymerization thing elastomer of 55-65 part that step 1 is made, the COPP of 35-45 part, 0.1-0.5 part mixes and stirs, extrude through dual-screw-stem machine, repressed back forms base diaphragm just.
4. a kind of filter press according to claim 3 preparation technology of polypropylene diaphragm, the operation that it is characterized in that described step 2 also comprises: after dual-screw-stem machine is extruded, cooling earlier, pelletizing forms the finished product pellet, the finished product pellet is detected, after qualified, again the finished product pellet is melt extruded through single-screw machine, keep the temperature of extrudate, transfer to compacting, cooling and shaping in the hydraulic press again, form base diaphragm just.
5. a kind of filter press according to claim 4 is with the preparation technology of polypropylene diaphragm, when it is characterized in that the finished product pellet sent into the single-screw machine fusion, also adds color masterbatch and pellet mixed melting in single-screw machine, extrudes colored extrudate.
6. a kind of filter press according to claim 5 is characterized in that the operation of described step 2 also comprises: described base diaphragm is just milled to specific thickness through the disk plate-milling machine with the preparation technology of polypropylene diaphragm.
7. a kind of filter press according to claim 2 preparation technology of polypropylene diaphragm, it is characterized in that: by weight, described first auxiliary agent comprises: the compatilizer of 1-2 part, described compatilizer are graft polypropylene.
8. a kind of filter press according to claim 3 preparation technology of polypropylene diaphragm, it is characterized in that: by weight, described second auxiliary agent comprises: the lubricant of 0.1-0.2 part, described lubricant are paraffin or stearic acid.
9. a kind of filter press according to claim 3 preparation technology of polypropylene diaphragm is characterized in that: the draw ratio of described dual-screw-stem machine is (30-35): 1, and barrel temperature is controlled at 170 ℃-200 ℃, and rotating speed is 140r/min-180r/min.
10. a kind of filter press according to claim 6 preparation technology of polypropylene diaphragm is characterized in that: the draw ratio of described single-screw machine is (28-33): 1, and barrel temperature is controlled at 170 ℃-200 ℃, and rotating speed is 30r/min-70r/min; The pressure of described hydraulic press is 400t-600t, suppress through hydraulic press, baking veneer on the described base diaphragm just is 28.5mm-29.5mm to the distance of sealing surface, filtering area in the diaphragm comprises two respectively with baking veneer and the corresponding filtering surface of sealing surface with stand on the filter post of each filtering surface, and the distance between two filtering surfaces is 5.5mm-6.5mm; After the disk plate-milling machine milled system, the baking veneer was 23.6mm-24.4mm to the distance of sealing surface with first base diaphragm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010132993A CN101875234B (en) | 2010-03-26 | 2010-03-26 | Preparation process of polypropylene diaphragm for pressure filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010132993A CN101875234B (en) | 2010-03-26 | 2010-03-26 | Preparation process of polypropylene diaphragm for pressure filter |
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| CN101875234A true CN101875234A (en) | 2010-11-03 |
| CN101875234B CN101875234B (en) | 2012-10-10 |
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| CN201010132993A Expired - Fee Related CN101875234B (en) | 2010-03-26 | 2010-03-26 | Preparation process of polypropylene diaphragm for pressure filter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109575500A (en) * | 2018-11-30 | 2019-04-05 | 河南大张过滤设备有限公司 | A kind of bi-material layers height rebound diaphragm |
| CN110041604A (en) * | 2018-01-16 | 2019-07-23 | 中夏新能源（上海）有限公司 | A kind of diaphragm, preparation method and diaphragm pump |
| CN111450585A (en) * | 2020-04-08 | 2020-07-28 | 杭州天惠实业有限公司 | Preparation process of polypropylene diaphragm core plate for filter press |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0142173A2 (en) * | 1983-11-16 | 1985-05-22 | Mitsubishi Plastics Industries Limited | Diaphragm for a filter press |
| JPS60238109A (en) * | 1984-05-11 | 1985-11-27 | Mitsubishi Plastics Ind Ltd | Preparation of composite diaphragm for filter press |
| CN2225886Y (en) * | 1995-05-09 | 1996-05-01 | 济南化工机械总厂 | Polypropylene diaphragm filter press |
-
2010
- 2010-03-26 CN CN201010132993A patent/CN101875234B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0142173A2 (en) * | 1983-11-16 | 1985-05-22 | Mitsubishi Plastics Industries Limited | Diaphragm for a filter press |
| JPS60238109A (en) * | 1984-05-11 | 1985-11-27 | Mitsubishi Plastics Ind Ltd | Preparation of composite diaphragm for filter press |
| CN2225886Y (en) * | 1995-05-09 | 1996-05-01 | 济南化工机械总厂 | Polypropylene diaphragm filter press |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110041604A (en) * | 2018-01-16 | 2019-07-23 | 中夏新能源（上海）有限公司 | A kind of diaphragm, preparation method and diaphragm pump |
| CN109575500A (en) * | 2018-11-30 | 2019-04-05 | 河南大张过滤设备有限公司 | A kind of bi-material layers height rebound diaphragm |
| CN111450585A (en) * | 2020-04-08 | 2020-07-28 | 杭州天惠实业有限公司 | Preparation process of polypropylene diaphragm core plate for filter press |
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| Publication number | Publication date |
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| CN101875234B (en) | 2012-10-10 |
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Address after: 311115 west side of No. 1-1 Guo Fu Road, Pingyao Town, Yuhang District, Hangzhou, Zhejiang. Patentee after: Hangzhou Hengda Chemical Machinery Co.,Ltd. Address before: 311200 Zhejiang province Hangzhou Yuhang bottle kiln industrial area (New 104 National Road) Hangzhou Hengda Chemical Machinery Factory Patentee before: Hangzhou Hengda Chemical Machinery Factory |
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Granted publication date: 20121010 |