CN103432822A - Monofilament filter fabric for coal washing and preparation method thereof - Google Patents
Monofilament filter fabric for coal washing and preparation method thereof Download PDFInfo
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- CN103432822A CN103432822A CN2013104067010A CN201310406701A CN103432822A CN 103432822 A CN103432822 A CN 103432822A CN 2013104067010 A CN2013104067010 A CN 2013104067010A CN 201310406701 A CN201310406701 A CN 201310406701A CN 103432822 A CN103432822 A CN 103432822A
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Abstract
The invention relates to the field of the filter materials and in particular relates to a monofilament filter fabric for coal washing and a preparation method thereof. The monofilament filter fabric is prepared from the following raw materials by weight percent: 50-75% of high density polyethylene, 24.5-48% of polypropylene and 0.2-2% of white oil. The preparation method of the monofilament filter fabric comprises the following step of: forming primary filaments through extrusion, wherein the front-end heating temperature of an extruder used for extrusion ranges from 160 to 164 DEG C, while the middle-end heating temperature of the extruder ranges from 255 to 260 DEG C and the rear-end heating temperature of the extruder ranges from 255 to 275 DEG C; the heating temperature of a die head ranges from 260 to 280 DEG C; the extrusion speed ranges from 17 to 19 m/min. Compared with the monofilament filter fabric in the prior art, the monofilament filter fabric has the advantages that the breaking strength is obviously improved; no breakage is caused in the monofilament weaving process to affect the production efficiency of a waving machine; as a result, the production efficiency is improved and the economic benefit is increased; meanwhile the service life of the filter fabric is prolonged; in addition, the appearance of the filter fabric is also improved so that the competitive force of the product can be improved.
Description
Technical field
The present invention relates to the filtering material field, in particular to monofilament filter cloth and preparation method thereof for coal washing.
Background technology
In the coal washing process, while with vacuum filter, centrifuge, band filter or plate and frame filter etc., suspension being carried out to Separation of Solid and Liquid, mostly adopt filter cloth as filter medium.Wherein, monofilament filter cloth is to be weaved and formed by single synthetic fibers, has intensity large, is difficult for blocking, not broken yarn, stability is high, not yielding, and aperture is even, smooth surface, and filter cake is easily peeled off, the filter cloth easy cleaning, regeneration is easy, the advantages such as life-span length, development in recent years is rapid.
In correlation technique, coal washing generally adopts polypropylene material with monofilament filter cloth, by batching, extrudes, cooling, hot drawing-off, and water suction, the oiling rolling, sub-wire, warping, weave, and the technique of calendering is prepared from.
But, because the strength of filament of polypropylene material is low, in the process of utilizing monofilament to weave cotton cloth, single wire fracture easily appears, cause loom defects, and greatly reduce the production efficiency of loom, and then reduced production efficiency, increased production cost.
Summary of the invention
The object of the present invention is to provide special-purpose monofilament filter cloth of a kind of coal washing and preparation method thereof, to solve the above problems.
A kind of coal washing monofilament filter cloth is provided in an embodiment of the present invention, and described monofilament filter cloth is made by the raw material of following part by weight: high density polyethylene (HDPE) 50-75%, polypropylene 24.5-48%, white oil 0.2-2%.
Another coal washing monofilament filter cloth also is provided in embodiments of the invention, and described monofilament filter cloth is made by the raw material of following part by weight: high density polyethylene (HDPE) 50-75%, polypropylene 24.5-48%, white oil 0.2-2%, delustering agent 0.2-2%.
The third coal washing monofilament filter cloth also is provided in embodiments of the invention, and described monofilament filter cloth is made by the raw material of following part by weight: high density polyethylene (HDPE) 50-75%, polypropylene 24.5-48%, white oil 0.2-2%, the dark green 0.2-2% of titanium.
The embodiment of the present invention also provides the preparation method of monofilament filter cloth of the coal washing in a kind of above-described embodiment, comprise: extrude and obtain spun filament, the described front end heating-up temperature that obtains spun filament step extruder used of extruding is 160-164 ℃, the middle-end heating-up temperature is 255-260 ℃, the rear end heating-up temperature is 255-275 ℃, the die head heating-up temperature is 260-280 ℃, and extruded velocity is 17-19m/min.
Monofilament filter cloth and preparation method thereof for the coal washing of the above embodiment of the present invention, by selecting above-mentioned raw materials and passing through aforesaid operations, the monofilament filter cloth of the high density polyethylene (HDPE) obtained and polypropylene blending, combine the advantage of high density polyethylene (HDPE) and polypropylene, shortcoming while having avoided both each comfortable making monofilament filter cloths, with the monofilament filter cloth in correlation technique, compare, the monofilament filter cloth ultimate strength of high density polyethylene (HDPE) and polypropylene blending is significantly improved, thereby can not rupture and affect the production efficiency of loom in the woven process of monofilament, improved production efficiency, increased economic benefit,
Simultaneously, the ultimate strength increase due to filter cloth, obtained prolongation the service life of filter cloth; In addition, outside perception also is improved, and has improved the competitiveness of product.
The specific embodiment
The embodiment of the present invention provides a kind of coal washing monofilament filter cloth, and wherein, monofilament filter cloth can be made by the raw material of following part by weight:
One, high density polyethylene (HDPE) 50-75%, polypropylene 24.5-48%, white oil 0.2-2%;
Two, high density polyethylene (HDPE) 50-75%, polypropylene 24.5-48%, white oil 0.2-2%, the dark green 0.2-2% of titanium;
Three, high density polyethylene (HDPE) 50-75%, polypropylene 24.5-48%, white oil 0.2-2%, delustering agent 0.2-2%.
The monofilament filter cloth that the embodiment of the present invention provides is in preparation process, the front end heating-up temperature of extruding extruder used is 160-164 ℃, and the middle-end heating-up temperature is 255-260 ℃, and the rear end heating-up temperature is 255-275 ℃, the die head heating-up temperature is 260-280 ℃, and extruded velocity is 17-19m/min.
In the present invention, by by high density polyethylene (HDPE), polypropylene, white oil is mixed with the coal washing monofilament filter cloth, after batching in extruder, to high density polyethylene (HDPE), the mixture of polypropylene and white oil carries out progressively high-temperature heating, high density polyethylene (HDPE) and polyacrylic temperature are raise gradually, when extruding the stage gradually in molten condition, and the rearrangement between two quasi-molecules occurs, white oil is as a kind of oil soluble material, when the polyethylene generation intermolecular rearrangement of the high density polyethylene (HDPE) of molten state and molten state, make the molecular structure after high density polyethylene (HDPE) and polypropylene are reset more firm, obtain the monofilament filter cloth of high density polyethylene (HDPE) and polypropylene blending.
While also comprising the dark green organic dyestuff of titanium in raw material, the monofilament filter cloth that obtains high density polyethylene (HDPE) and polypropylene blending presents green.In addition, except the titanium viridescent can be used as the preparation of organic dyestuff for the monofilament filter cloth of high density polyethylene (HDPE) and polypropylene blending, can also select the organic dyestuff of other any one colors.
While in raw material, also comprising delustering agent, the monofilament filter cloth that obtains high density polyethylene (HDPE) and polypropylene blending can improve the optical reflection performance on monofilament filter cloth surface, reduces the transparency of monofilament filter cloth, increases the whiteness of monofilament filter cloth.
Because high density polyethylene (HDPE) non-refractory, therefore, the temperature heated in extruder can not be too high, but, can not be too low, because polyacrylic fusing point is high, temperature is low polypropylene can not melting, therefore, in the present invention, the front end heating-up temperature of extruding extruder used is 160-164 ℃, the middle-end heating-up temperature is 255-260 ℃, the rear end heating-up temperature is 255-275 ℃, the die head heating-up temperature is 260-280 ℃, make polypropylene and high density polyethylene (HDPE) can be good at melting, can not make high density polyethylene (HDPE) transition melting form liquid simultaneously yet, operation is extruded in impact.In addition, when extruded velocity is 17-19m/min, the spun filament even thickness obtained and powerful high.
The present invention is by selecting above-mentioned raw materials and passing through aforesaid operations, the monofilament filter cloth of the high density polyethylene (HDPE) obtained and polypropylene blending, combine the advantage of high density polyethylene (HDPE) and polypropylene, shortcoming while having avoided both each comfortable making monofilament filter cloths, with the monofilament filter cloth in correlation technique, compare, the monofilament filter cloth ultimate strength of high density polyethylene (HDPE) and polypropylene blending is significantly improved, thereby can not rupture and affect the production efficiency of loom in the woven process of monofilament, improve production efficiency, increased economic benefit; Simultaneously, the ultimate strength increase due to filter cloth, obtained prolongation the service life of filter cloth; In addition, outside perception also is improved, and has improved the competitiveness of product.
Further, spun filament cooling and shaping temperature is 35-46 ℃, and the stroke of spun filament is 50-55cm.In the embodiment of the present invention, the cooling and shaping of spun filament is usingd water as medium, and temperature is too low, easily causes spun filament cooling rapidly, can reduce cooling effect, makes powerful the reduction, if excess Temperature can not well be realized the effect of cooling and shaping.The stroke of spun filament also can have influence on the effect of cooling and shaping.
Further, described hot drawing-off comprises hot drawing-off 1 and hot drawing-off 2, and the temperature of described hot drawing-off 1 is 95-97 ℃, and draw ratio is 4.18-4.58, and the temperature of described hot drawing-off 2 is 98-99 ℃, and draw ratio is 7.51-10.21.In the embodiment of the present invention, adopt twice drawing-off, different from the single drawing-off.Adopt hot water as the drawing-off medium, at higher temperature, can make high density polyethylene (HDPE) and polyacrylic mixture that intermolecular rearrangement more easily occurs in drafting process, therefore, the present invention, when adopting hot water as medium, adopts high-temperature water.Adopt the mode of twice drawing-off simultaneously, compare with the single drawing-off, the first drawing-off of twice drawing-off can adopt less draw ratio, avoids the process of resetting between the saboteur, and the silk that makes to obtain is powerful low.
Further, described calendering adopts the drum-type calender, its calendering temperature 150-180 ℃, and drum rotation speed is 5-10m/min.Under this condition, the monofilament filter cloth surfacing obtained, presentation quality is high.
The monofilament filter cloth that the embodiment of the present invention provides specifically can be prepared as follows:
Step 1, take raw material, mixes and stir.
Step 2, the compound that step 1 is obtained is poured in the screw extruder feed bin, make its at high temperature melting, wherein extruder front end heating-up temperature is 160-164 ℃, the middle-end heating-up temperature is 255-260 ℃, the rear end heating-up temperature is 255-275 ℃, and the die head heating-up temperature is 260-280 ℃, and extruded velocity is 17-19m/min.Obtain spun filament.
Step 3 is carried out spun filament coolingly in 35-46 ℃ of cold rinse bank, and wherein, the stroke of spun filament in cold rinse bank is 50-55cm.
Step 4, adopt five (rubber cylinder) drafting machine spun filament that step 3 is cooling to carry out twice drawing-off, and regulating the drafting machine revolution is 83-173.63m/min.At first carry out hot drawing-off 1 in the hot water storgae of 96 ℃, draw ratio is 4.18-4.58, then in 98 ℃ of hot water storgaes, carries out hot drawing-off 2, and draw ratio is: 7.51-10.21.
Step 5, according to the conventional method of this area, utilize the spun filament absorbent drying after the absorption fan for water counter extensioin.Use the high speed absorption fan for water, connect 2 water-absorbing cylinders and at the upper and lower two side faces of monofilament, it is absorbed water.Both can make to the spun filament cooling and shaping by absorbent drying, guarantee strength of filament; Can remove moisture again, prepare for the back monofilament adds spinning oil.
Step 6, according to the conventional method of this area, connect coiled body by dried spun filament, splashes into the spinning oil rolling, obtains the monofilament axle;
Step 7, according to the conventional method of this area, be placed on spun filament on the sub-wire machine and be divided into 64 monofilament.
Step 8, the conventional method according to this area, be rolled onto monofilament on loom shaft with sectional warper.
Step 9, weave cotton cloth with increasing the weight of the oar rapier loom, and weavy grain adopts five piece three (satin), and lower machine is through close 491/10cm, 139/10cm of filling density.
Step 10, adopt the calendering of drum-type calender to monofilament filter cloth, and wherein, temperature is 170 ℃, and drum rotation speed is 10 m/mins.
Below by specific embodiment, the present invention is described in further detail.
The monofilament filter cloth of the high density polyethylene (HDPE) that the embodiment of the present invention provides and polypropylene blending, according to the regulation of GB/T3923.1-1997 textile fabric tensile property, the ultimate strength of the monofilament filter cloth that embodiment 1-12 and Comparative Examples are provided is tested.
The coal washing that embodiment 1-4 provides is as shown in table 1 with material, weight and the ultimate strength of monofilament filter cloth.
Material, weight and the ultimate strength of monofilament filter cloth for the coal washing that table 1 embodiment 1-4 provides
Execute the preparation process of the monofilament filter cloth that routine 1-4 provides as mentioned above, just process conditions are different, and it is as shown in table 2 that embodiment 1-4 prepares the process conditions of monofilament filter cloth.
Table 2 embodiment 1-4 prepares the process conditions of monofilament filter cloth
The strength of filament of the high density polyethylene (HDPE) that embodiment 1-4 provides and polypropylene blending can reach 59-63cN/tex, not there will be the situation of single wire fracture while utilizing it to weave cotton cloth, loom can be produced smoothly, weave cotton cloth and compare with use polypropylene material monofilament, the production efficiency of loom improves greatly, has reduced production cost.
The coal washing that embodiment 5-8 provides is as shown in table 3 with material, weight and the ultimate strength of monofilament filter cloth.
Material, weight and the ultimate strength of monofilament filter cloth for the coal washing that table 3 embodiment 5-8 provides
Execute the preparation process of the monofilament filter cloth that routine 5-8 provides as mentioned above, just process conditions are different, and it is as shown in table 4 that embodiment 5-8 prepares the process conditions of monofilament filter cloth.
Table 4 embodiment 5-8 prepares the process conditions of monofilament filter cloth
The strength of filament of the high density polyethylene (HDPE) that embodiment 5-8 provides and polypropylene blending can reach 60-63cN/tex, not there will be the situation of single wire fracture while utilizing it to weave cotton cloth, loom can be produced smoothly, weave cotton cloth and compare with use polypropylene material monofilament, the production efficiency of loom improves greatly, has reduced production cost; Simultaneously, monofilament filter cloth is green, makes the surperficial perception of filter cloth better, more can attract the consumer.
The coal washing that embodiment 9-12 provides is as shown in table 5 with material, weight and the ultimate strength of monofilament filter cloth.
Material, weight and the ultimate strength of monofilament filter cloth for the coal washing that table 5 embodiment 9-12 provides
Execute the preparation process of the monofilament filter cloth that routine 9-12 provides as mentioned above, just process conditions are different, and it is as shown in table 6 that embodiment 9-12 prepares the process conditions of monofilament filter cloth.
Table 6 embodiment 9-12 prepares the process conditions of monofilament filter cloth
The strength of filament of the high density polyethylene (HDPE) that embodiment 9-12 provides and polypropylene blending can reach 60-63cN/tex, not there will be the situation of single wire fracture while utilizing it to weave cotton cloth, loom can be produced smoothly, weave cotton cloth and compare with use polypropylene material monofilament, the production efficiency of loom improves greatly, has reduced production cost; Simultaneously, in embodiment 9-12, the material that delustering agent can select titanium dioxide etc. to brighten.Delustering agent is produced to monofilament filter cloth as one of raw material, can improve the optical reflection performance on monofilament filter cloth surface, reduce the transparency of monofilament filter cloth, increase the whiteness of monofilament filter cloth.Make the presentation quality of monofilament filter cloth of gained better, more can attract the consumer.
Comparative Examples: a kind of polypropylene monofilament filter cloth is comprised of the material of following weight parts: polypropylene 100g.
The polypropylene monofilament filter cloth that Comparative Examples provides is prepared according to the technological means of this area routine.
The detection method of the ultimate strength of polypropylene monofilament is with the detection method of embodiment 1-12.The ultimate strength of this Comparative Examples polypropylene monofilament is: 50cN/tex.Because the strength of filament of polypropylene material is low, in utilizing its process of weaving cotton cloth, single wire fracture easily appears, cause loom defects, thereby reduce the production efficiency of loom, and then reduce production efficiency, increase production cost.
The polypropylene monofilament filter cloth provided with Comparative Examples is compared, the monofilament filter cloth ultimate strength of the high density polyethylene (HDPE) that embodiment of the present invention 1-12 provides and polypropylene blending obviously improves, can meet the requirement of loom to strength of filament, can not cause occurring the situation of single wire fracture in the process of weaving cotton cloth, thereby improved the production efficiency of equipment, improve production efficiency, reduced production cost.
Wherein, in embodiment 1,6,10, high density polyethylene (HDPE) and polypropylene molecular rearrangement effect under molten condition is best, given full play to the high density polyethylene (HDPE) mechanical strength good, the characteristics that environmental stress crack resistance is good, with the resistant to elevated temperatures characteristics of polypropylene, with the monofilament filter cloth of polythene material, compare, improved the hardness of filter cloth, surface is not easy to occur fold, with the monofilament filter cloth of polypropylene material, compares, improved the ultimate strength of monofilament, loom can be produced smoothly, improved the production efficiency of loom, improved economic benefit.And the monofilament filter cloth that embodiment 6 provides has color, in the embodiment of the present invention, because high density polyethylene (HDPE) and polypropylene are blended under heated condition, intermolecular rearrangement has occurred, in the process of resetting, with fuel-bound, make the monofilament obtained there is the color of fuel, thereby improved the presentation quality of monofilament filter cloth, improved the competitiveness of product in market; In like manner, in the raw material of embodiment 10, owing to having increased delustering agent, therefore, the monofilament filter cloth obtained is whiter, and presentation quality is better, has improved the competitiveness of product in market.
The monofilament filter cloth that embodiment of the present invention 1-12 and Comparative Examples are provided is for the solid-liquid separation process of coal washing process, the automatic chamber-type press filter of separation equipment XMZ1250-U; Separation condition is: sealed normal temperature high voltage filters.Found that, under identical filter condition, carry out conventional filter operation according to conventional technological requirement, method, be 1600-2000 hour the service life of the monofilament filter cloth of the high density polyethylene (HDPE) that embodiment of the present invention 1-12 provides and polypropylene blending, and be 1200 hours the service life of the polypropylene monofilament filter cloth that Comparative Examples provides.Visible, meeting under the prerequisite of filtering requirement, the high density polyethylene (HDPE) that the embodiment of the present invention provides and polypropylene blending monofilament filter cloth are than the long service life of polypropylene monofilament filter cloth.
The model of raw materials used in the embodiment of the present invention, equipment and originate as shown in table 7.
Raw materials used in table 7 embodiment 1-12 and Comparative Examples, equipment
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a coal washing monofilament filter cloth, is characterized in that, described monofilament filter cloth is made by the raw material of following part by weight: high density polyethylene (HDPE) 50-75%, polypropylene 24.5-48%, white oil 0.2-2%.
2. coal washing monofilament filter cloth according to claim 1, is characterized in that, described monofilament filter cloth is made by the raw material of following part by weight: high density polyethylene (HDPE) 75%, polypropylene 24.5%, white oil 0.5%.
3. a coal washing monofilament filter cloth, is characterized in that, described monofilament filter cloth is made by the raw material of following part by weight: high density polyethylene (HDPE) 50-75%, polypropylene 24.5-48%, white oil 0.2-2%, the dark green 0.2-2% of titanium.
4. coal washing monofilament filter cloth according to claim 3, is characterized in that, described monofilament filter cloth is made by the raw material of following part by weight: high density polyethylene (HDPE) 70%, polypropylene 28.7%, white oil 0.8%, titanium viridescent 0.5%.
5. a coal washing monofilament filter cloth, is characterized in that, described monofilament filter cloth is made by the raw material of following part by weight: high density polyethylene (HDPE) 50-75%, polypropylene 24.5-48%, white oil 0.2-2%, delustering agent 0.2-2%.
6. coal washing monofilament filter cloth according to claim 5, is characterized in that, described monofilament filter cloth is made by the raw material of following part by weight: high density polyethylene (HDPE) 72%, polypropylene 36%, white oil 0.5%, delustering agent 1.5%.
7. the preparation method of monofilament filter cloth for the described coal washing of claim 1-6 any one, comprise and extrude the step that obtains spun filament, it is characterized in that, the described front end heating-up temperature that obtains spun filament step extruder used of extruding is 160-164 ℃, the middle-end heating-up temperature is 255-260 ℃, the rear end heating-up temperature is 255-275 ℃, and the die head heating-up temperature is 260-280 ℃, and extruded velocity is 17-19m/min.
8. the preparation method of monofilament filter cloth for coal washing according to claim 7 also comprises after extruding and it is characterized in that the step of cooling and shaping that the temperature of described cooling and shaping is 35-46 ℃, and the stroke of described spun filament is 50-55cm.
9. the preparation method of monofilament filter cloth for coal washing according to claim 8, also comprise the step of hot drawing-off after cooling and shaping, it is characterized in that, described hot drawing-off comprises hot drawing-off 1 and hot drawing-off 2, the temperature of described hot drawing-off 1 is 95-97 ℃, draw ratio is 4.18-4.58, and the temperature of described hot drawing-off 2 is 98-99 ℃, and draw ratio is 7.51-10.21.
10. the preparation method of monofilament filter cloth for coal washing according to claim 9 also comprises after cooling and shaping and it is characterized in that the step of calendering that described calendering adopts the drum-type calender, its calendering temperature 150-180 ℃, and drum rotation speed is 5-10m/min.
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| CN107297102A (en) * | 2017-06-29 | 2017-10-27 | 江苏灵氟隆环境工程有限公司 | A kind of preparation method of high-strength corrosion-resisting industrial filter cloth |
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| CN109023647A (en) * | 2018-08-22 | 2018-12-18 | 安徽利思达网业有限公司 | A kind of preparation method of the wear-resisting monofilament filter cloth of filtering high temperature liquid |
| CN109778334A (en) * | 2019-01-24 | 2019-05-21 | 鸡西市恒润滤布有限公司 | A kind of coal washing monofilament filter cloth and preparation method thereof |
| CN115874333A (en) * | 2022-07-20 | 2023-03-31 | 江苏三元环保科技有限公司 | Manufacturing process of dust removal filter material |
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| CN103432822B (en) | 2015-12-23 |
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