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Anti-crystallization and high abrasion resistance modified monofilament and preparation method of industrial filter screen

A technology with high wear resistance and anti-crystallization, which is applied in the direction of single-component polyolefin artificial filament, drawing spinning, and melting of filament raw materials. Improve the non-stick and wear resistance, reduce the surface friction coefficient and improve the surface smoothness

Active Publication Date: 2017-11-07
厦门厦迪亚斯环保过滤技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chemical raw materials are indispensable and important raw materials in industrial production. Almost all industrial production is inseparable from chemical raw materials. The extraction and production of inorganic chemical raw materials mainly come from minerals. With the massive mining of minerals in recent years, the grade of ore is getting higher and higher. The lower and lower, the extraction of useful inorganic products in ores becomes more and more difficult, so industrial filters are becoming more and more important as a medium for filtering and separating mineral slurry, especially for non-ferrous metal industry, phosphoric acid industry and titanium dioxide industry. There is serious crystal scaling in the industrial filter screen, which causes the filter screen to be blocked, and the filter performance of the filter screen is gradually reduced, resulting in a serious decline in the production capacity and quality of the product. The performance is also deteriorated, and the whole filter will be scrapped after partial wear
At present, the monofilament material used in the filter screens on the market is mainly polypropylene (PP). The material is easy to crystallize in the pores of the filter screen, causing the pores of the filter screen to be blocked. At the same time, due to the poor wear resistance of the PP material, the reliable service life does not exceed One month, completely unable to meet the requirements of industry production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The method for preparing a modified monofilament with anti-crystallization and high wear resistance is characterized in that it comprises the following steps:

[0024] S1. The raw material of the filter screen is equipped according to the weight ratio.

[0025] The present embodiment selects raw material as follows:

[0026] Drawing grade polypropylene (PP), brand PPH-T03 (manufacturer: Hainan Petrochemical), melt index 2.17g / 10min, 800g;

[0027] Ethylene-tetrafluoroethylene copolymer (ETFE, also known as F40), Teflon grade 750 (manufacturer: DuPont, USA), melt index 25g / 10min, 200g.

[0028] S2. Blend and melt extrude monofilament, blend and melt the above-mentioned prepared raw materials in the extrusion screw and extrude monofilament. 290℃~300℃, metering section 300℃~310℃, die head 310℃~315℃;

[0029] S3. Hot drawing of monofilaments. The monofilaments extruded from the die in step S2 are cooled by water at 60° C. to 80° C. to obtain primary fibers, and then go t...

Embodiment 2

[0034] The preparation method of the modified monofilament with anti-crystallization and high wear resistance is the same as the first embodiment except step S3.

[0035] S3. Hot drawing of monofilaments. The monofilaments extruded from the die in step S2 are cooled by water at 60° C. to 80° C. to obtain primary fibers, and then go through two stages of hot drawing in sequence.

[0036] (1) Pre-drawing is carried out by hot water at 90°C, and the drafting ratio is 4.2 times.

[0037] (2) Secondary drafting by hot air at 140°C, the drafting ratio is 1.8 times.

[0038] The modified monofilaments prepared in the above-mentioned Examples 1 and 2 (respectively PP fluorine-modified silk 1#, PP fluorine-modified silk 2# and PP original silk were tested for wear resistance. The test process and results are as follows:

[0039] Test instrument: reciprocating wear tester, stroke 100mm, speed 30ind. / min, wear body is 60# gravel. The test data are shown in Table 1.

[0040] Table 1. A...

Embodiment 3

[0044] The preparation method of the anti-crystallization and high abrasion resistance industrial filter screen is characterized in that it comprises the following steps:

[0045] S1~S4 are the same as embodiment two.

[0046] S5. Weaving the filter screen, weaving the modified monofilament into a semi-finished filter screen on a heavy-duty loom according to the density and texture of the fabric;

[0047] S6. Heat setting of the filter screen, heat setting of the semi-finished filter screen at a temperature of 120°C to 150°C;

[0048] S7. Calendering and shaping, the semi-finished filter screen is heat-set and then heat-calendered under the calender, the temperature is 130°C-150°C, and the pressure is 4MPa-6MPa.

[0049] The industrial filter screen that present embodiment prepares carries out following test:

[0050] (1) Hydrophobicity detection

[0051] Test equipment: contact angle measuring instrument, test resolution 0.01°, test accuracy 0.1°.

[0052] Technical indic...

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Abstract

The invention discloses a preparation method of a modified monofilament with anti-crystallization and high wear resistance and an industrial filter screen, including the steps of raw material preparation, blending and extruding the monofilament, thermal drawing of the monofilament, heat setting and the like, and making full use of ETFE Excellent non-stickiness and hydrophobicity, so that the filtered material can be completely separated from the filter screen, thus avoiding the problem of crystallization of the material in the pores of the filter screen, and at the same time greatly improving the wear resistance of the filter screen.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a modified monofilament with anti-crystallization and high wear resistance and an industrial filter screen. Background technique [0002] Monofilament is a single filament with a large count produced by a porous spinneret in chemical fiber production. Monofilaments of different properties can be used to meet different needs, such as textiles, fishing nets, ropes, and industrial filters. Wait. [0003] Chemical raw materials are indispensable and important raw materials in industrial production. Almost all industrial production is inseparable from chemical raw materials. The extraction and production of inorganic chemical raw materials mainly come from minerals. With the massive mining of minerals in recent years, the grade of ore is getting higher and higher. The lower and lower, the extraction of useful inorganic products in ores becomes more and more difficult, so industrial f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/46D01F1/10D01D1/04D01D5/14D01D10/02D03D15/00D06C7/02D06C15/00
Inventor 张德成关太平
Owner 厦门厦迪亚斯环保过滤技术有限公司
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