Polyester type large-aperture filtration sponge for ceramic filter and preparation method of large-aperture filtration sponge

A technology of filter sponge and ceramic filtration, applied in the field of polyester sponge, can solve the problems such as affecting the thoroughness and quality of the foaming nucleation reaction, large grid gap, and lack of macroporous filter sponge.

Pending Publication Date: 2019-02-26
湖北世丰新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. Because the existing chemical methods and formulas cannot obtain stable macroporous filter sponges. As we all know, the larger the pore size of the sponge, the larger the grid gap in the process of forming it to the limit sponge pore size, and the grids connecting the grids The linker is fragile, resulting in a large amount of collapse and shrinkage of the sponge before it ente

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Obtain a polyester sponge with a PPI value of 7

[0030] 1) Adjust the head pressure to 2.5-3.5kg, adjust the raw material injection pressure to 10-20kg;

[0031] 2), 100 parts of polyester polyols with a hydroxyl value of 60 mgKOH / g, 55.25 parts of isocyanates with an Index value of 120, 3.8 parts of water, 1.5 parts of silicone oil, and 1.2 parts of catalysts are delivered to the foaming machine head by metering pumps;

[0032] 3), each raw material is carried out to vacuumize respectively (all materials of various raw materials are all vacuumized), and the vacuum pressure is minus one atmospheric pressure;

[0033] 4) Mix the raw materials in the machine head;

[0034] 5) After high-speed stirring, the material is evenly distributed on the conveyor belt on the foaming production line;

[0035] 6) Carry out gel reaction during the transmission process of the continuous foaming production line, solidify and form to obtain flexible polyurethane foam, and then cut it i...

Embodiment 2

[0038] Obtain a polyester sponge with a PPI value of 8

[0039] 1), each raw material is carried out to vacuumize respectively (all materials of various raw materials are all vacuumized), and the vacuum pressure is minus one atmospheric pressure;

[0040] 2), 100 parts of polyester polyols with a hydroxyl value of 60 mgKOH / g, 55.25 parts of isocyanates with an Index value of 120, 3.8 parts of water, 1.5 parts of silicone oil, and 1.2 parts of catalysts are delivered to the foaming machine head by metering pumps;

[0041] 3), adjust the head pressure to 2-3kg, adjust the raw material injection pressure to 10-20kg;

[0042] 4), mixing each raw material in the reactor;

[0043] 5) After high-speed stirring, the material is evenly distributed on the conveyor belt on the foaming production line;

[0044] 6) Carry out gel reaction during the transmission process of the continuous foaming production line, solidify and form to obtain flexible polyurethane foam, and then cut it into ...

Embodiment 3

[0047] Obtain a polyester sponge with a PPI value of 15

[0048] 1) Vacuumize 50% of the materials in each raw material respectively. The vacuum pressure is minus one atmosphere; The heads are responsible for 50% of the materials required for the reaction. One of the heads is vacuumed, and the other is not operated, so that 50% of the materials can be vacuumed, and the remaining materials are not vacuumed.

[0049] 2), 100 parts of polyester polyols with a hydroxyl value of 60 mgKOH / g, 55.25 parts of isocyanates with an Index value of 120, 3.8 parts of water, 1.5 parts of silicone oil, and 1.2 parts of catalysts are delivered to the foaming machine head by metering pumps;

[0050] 3) Adjust the head pressure to 1-2.5kg, and adjust the raw material injection pressure to 20-35kg;

[0051] 4), mixing each raw material in the reactor;

[0052] 5) After high-speed stirring, the material is evenly distributed on the conveyor belt on the foaming production line;

[0053] 6) Carry ...

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PUM

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Abstract

The invention provides polyester type large-aperture filtration sponge for a ceramic filter sheets and a preparation method of the large-aperture filtration sponge, belongs to the technical field of polyester sponge, and solves the technical problems of relatively small aperture of the conventional polyester sponge and the like. The preparation method of the polyester sponge comprises the following steps: conveying polyester polyol, isocyanate, water, silicone oil and a catalyst to a foaming machine head through a metering pump; adjusting a machine head pressure and a raw material spraying pressure; respectively vacuuming the various raw materials; mixing the various raw materials in a reaction kettle; after the raw materials are stirred at a high speed, uniformly distributing the materials on a conveyor belt of a foaming production line; performing gel reaction in a conveying process of the continuous foaming production line, solidifying and molding the materials to obtain polyurethane flexible foam plastic, and then cutting the plastic into a specified size on line; performing meshing treatment on the cut polyester sponge to obtain the polyester sponge having a PPI value between7 and 15. The preparation method has the advantage of obtaining the large-aperture polyester sponge.

Description

technical field [0001] The invention belongs to the technical field of polyester sponge, and relates to a polyester type coarse-pore filter sponge used for ceramic filters and a preparation method thereof. Background technique [0002] Polyether sponge is made by polymerizing and foaming polyether and isocyanate under the action of various additives. Compared with other sponge products such as polyether, the foam molding of polyester sponge has always been a difficult point in the field of sponge production. Based on its toughness and uniform voids, it is widely used in the skeleton of ceramic filters. [0003] Polyester sponge has a parameter called PPI, that is, the number of holes in the sponge per inch. During the application of ceramic filters, different types of filter media and different filtration flow rates require different grid gap requirements, corresponding to On the polyester sponge, the PPI requirements of the polyester sponge are different. For the PPI of th...

Claims

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Application Information

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IPC IPC(8): C08G18/42C08J9/08C08J9/36B01D39/04C08L75/06
CPCB01D39/04C08G18/42C08J9/08C08J9/36C08J2375/06
Inventor 曹凯
Owner 湖北世丰新材料有限公司
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