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Preparation process of polypropylene diaphragm core veneer for filter press

A preparation process, polypropylene technology, applied in applications, household components, filtration and separation, etc., can solve problems such as poor viscosity and temperature resistance, and achieve the effects of reducing waste, reasonable material utilization, and good overall performance.

Inactive Publication Date: 2020-07-28
杭州天惠实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the defects of poor viscosity between the polypropylene diaphragm core plate and the diaphragm sheet in the prior art and the lack of temperature resistance, the present invention provides a preparation process of the polypropylene diaphragm core plate for filter press, through which The polypropylene diaphragm core plate obtained by the preparation process has the advantages of good toughness, high strength, high temperature resistance, and good adhesion with the diaphragm sheet, and solves the above-mentioned problems existing in the existing technical solutions

Method used

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  • Preparation process of polypropylene diaphragm core veneer for filter press
  • Preparation process of polypropylene diaphragm core veneer for filter press
  • Preparation process of polypropylene diaphragm core veneer for filter press

Examples

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preparation example Construction

[0026] A preparation process of polypropylene diaphragm core plate for filter press. Step one: preparing the diaphragm core plate using maleic anhydride modified copolymer polypropylene (ie modified grafted polypropylene); step two: modifying maleic anhydride Co-polypropylene and co-polypropylene (PPR) are mixed to make finished pellets, and the finished pellets are made into a primary core board; Step 3: Drying and bonding the primary core board and the diaphragm to form a polymer for the filter press Propylene membrane filter plate. In the preparation process, the copolymer polypropylene adopts the material of the general brand PPR4220.

[0027] The process of step one: according to weight parts: 98-99 parts of copolymerized polypropylene, 1-1.98 parts of maleic anhydride, 0.02 parts of A additives are mixed and stirred uniformly, and then extruded and pelletized by a twin-screw machine, and finally dried and packed Bag preservation. In parts by weight, the first aid includes...

Embodiment 1

[0042] A preparation process of polypropylene diaphragm core plate for filter press includes the following steps:

[0043] Step 1: In parts by weight: 98 parts of copolymerized polypropylene, 1.98 parts of maleic anhydride, and 0.02 parts of dicumyl peroxide are mixed and stirred evenly, and then heated and melted by a twin-screw machine, extruded and pelletized, and finally dried and bagged save;

[0044] The length-diameter ratio of the twin-screw machine is 30:0.8, the temperature of the barrel is controlled at 180℃, and the speed is 160r / minr / min.

[0045] Step 2: After being extruded by a twin-screw machine, cool and pelletize to form finished pellets. Test the finished pellets. After passing the test, parts by weight: 10 parts of modified maleic anhydride obtained in step 1 Graft modified copolymer polypropylene and 90 parts of copolymer polypropylene are mixed and stirred, and then melted and extruded with a single screw extruder. The extrusion volume is 40kg. The temperature...

Embodiment 2

[0049] A preparation process of polypropylene diaphragm core plate for filter press includes the following steps:

[0050] Step 1: In parts by weight: 99 parts of copolymerized polypropylene, 1 part of maleic anhydride, 0.02 part of dicumyl peroxide are mixed and stirred evenly, then heated by a twin-screw machine, extruded and pelletized, and finally dried and bagged save;

[0051] The length to diameter ratio of the twin-screw machine is 35:1.5, the barrel temperature is controlled at 220°C, and the speed is 220r / min.

[0052] Step 2: After being extruded by a twin-screw machine, it is cooled and pelletized to form finished pellets. The finished pellets are tested. After passing the test, parts by weight: 20 parts of modified maleic anhydride obtained in step 1 Graft modified copolymerized polypropylene and 80 parts of copolymerized polypropylene were mixed and stirred, and then melted and extruded with a single screw extruder. The extrusion volume was 40kg. The temperature of the...

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Abstract

The invention relates to the field of filter materials, in particular to a preparation process of a polypropylene diaphragm core veneer for a filter press. The preparation process comprises the following steps: 1, preparing maleic anhydride grafted modified co-polypropylene for the diaphragm core veneer; 2, mixing maleic anhydride grafted modified polypropylene and co-polypropylene to prepare finished granules, and preparing an initial blank diaphragm core veneer from the finished granules; and 3, drying and bonding the diaphragm core veneer and a diaphragm sheet to form a polypropylene diaphragm filter plate for the filter press. The method overcomes the defects of poor adhesion and no temperature resistance of the polypropylene diaphragm core veneer and the diaphragm sheet in the prior art, and the polypropylene diaphragm core veneer prepared by the method has the beneficial effects of good toughness, high strength, high temperature resistance and good adhesion to the diaphragm sheet.

Description

Technical field [0001] The invention relates to a preparation process for preparing a polypropylene diaphragm core board, in particular to a preparation process for a polypropylene diaphragm core board for a filter press. Background technique [0002] Generally, the filter plate of a filter press uses a combination of a diaphragm filter plate and a chamber filter plate. The chamber filter plate is a solid structure, and the diaphragm filter plate is composed of a membrane and a core plate to form an internal chamber structure. [0003] The diaphragm filter plate is composed of two diaphragms and a core plate. The external medium (water or compressed air, etc.) is introduced into the cavity between the core plate and the diaphragm, so that the diaphragm swells and affects the diaphragm filter plate and the chamber filter plate. Composed of the filter cavity is compressed for better separation and higher solid content. Among them, the diaphragm is the main moving part, and repeated ...

Claims

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Application Information

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IPC IPC(8): B01D25/12C08F255/02C08F222/06B29B9/06B29C48/395B29C48/40B29C48/625B29C48/92
CPCB01D25/001B01D25/215B29B9/06B29L2031/14B29C48/397B29C48/40B29C48/625B29C48/92B29C2948/9258B29C2948/92704C08F255/02C08F222/06
Inventor 黄明宋慧杰
Owner 杭州天惠实业有限公司
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