CN1562442A - High density fibrous filter plate and manufacturing method - Google Patents

Abstract

The invention relates to a high-density fiber filter plate and its manufacturing method. The weight percent formula of the product is: sepiolite fiber 15-68; pulp fiber 25-84.3; adhesive 0.1-2; wet strength agent 0.5-3; Dry strength agent 0.1-2, the diameter of the sepiolite fiber is 10-100 μm, the length is 200-1000 μm; the pulp fiber is any one of inorganic fibers or plant fibers, or two or more pulp fibers mixed ; The adhesive is polyvinyl alcohol or epoxy resin; the wet strength agent is polyethyleneimine, polyamide epoxy resin or melamine; the dry strength agent is carboxymethyl cellulose or polyacrylamide. The manufacturing method includes: 1. preparing sepiolite fiber; 2. beating sepiolite fiber; 3. beating pulp fiber; 4. configuring mixed pulp; 5. papermaking and synthesis; 6. drying cylinder heating; 7. Shear forming and their associated process parameters. The filter plate of the invention has high porosity, large flux, good filtering effect, non-toxic sanitation and low manufacturing cost; the manufacturing method is simple, the operation is easy, conventional equipment is produced, and the implementation is convenient.

Description

High-density fiber filter plate and its manufacturing method

technical field

The invention relates to a fiber filter plate and its manufacturing method technology, specifically a high-density fiber filter plate with sepiolite fiber as a functional component and its manufacturing method technology. The international patent classification number is proposed to be Int.Cl7.B01D 29/00 .

Background technique

Fiber filter plate is an industrial material used for Newtonian fluid filtration, mainly used for filtering various fruit wine, liquor, beer, fruit juice, beverage, cooking oil, petroleum, health care liquid, etc. The existing fiber filter plates can generally be divided into two types: one is a filter plate made of synthetic fiber and plant fiber (such as wood fiber, grass fiber, etc.); the other is a filter plate made of asbestos and paper pulp. . The former has high cost, low filtration precision, small flux, and is easy to block (short service time); although the latter can reduce the cost, the filtration precision and flux are also not high, and the filtration effect is not good, especially asbestos products. The materials that are restricted by the state, if the liquid used for filtering by asbestos fiber filter board involves human or animal use, it will bring direct or potential harm.

Contents of the invention

Aiming at the deficiencies of the prior art, the main technical problem to be solved by the present invention is to provide a high-density fiber filter plate and its manufacturing method technology. The fiber filter plate has high porosity, large flux, good filtering effect, and is non-toxic and sanitary. The manufacturing cost is also low; the manufacturing method of the fiber filter plate has the advantages of simple method, easy operation, production and testing with conventional equipment, and convenient implementation.

The technical solution of the present invention to solve the technical problem of the high-density fiber filter plate product is: to design a high-density fiber filter plate, and its weight percentage formula is:

Sepiolite fiber 15-68;

Pulp fiber 25-84.3;

Adhesive 0.1-2;

Wet strength agent 0.5-3;

Dry strength agent 0.1-2,

The sepiolite fiber refers to a sepiolite fiber with a diameter of 10-100 μm and a length of 200-1000 μm; pulp fiber refers to any one of inorganic fibers or plant fibers, or a mixture of two or more pulps fiber; adhesive refers to polyvinyl alcohol or epoxy resin; wet strength agent refers to polyethyleneimine, polyamide epoxy resin or melamine; dry strength agent refers to carboxymethyl cellulose or polyacrylamide.

The technical solution of the present invention to solve the technical problem of the manufacturing method of the high-density fiber filter plate is: to design a manufacturing method of the high-density fiber filter plate, including the following process:

1. Preparation of sepiolite fiber: superfinely crush the selected sepiolite ore particles, and obtain the sepiolite fiber with a diameter of 10-100 μm and a length of 200-1000 μm after wind screening;

2. Sepiolite fiber beating: first heat the above-mentioned sepiolite fiber, the temperature range is 30-220°C, and the heating time is 1-3h; then use a standard beater to break it up for 2-5min, and then beat it with a beater for 5 minutes -10min, the beating degree is 60-90°SR, and the beating concentration is 1-3%;

3. Pulp fiber beating: Disperse the pulp fiber with a standard breaker for 20-50 minutes, and then beat it with a beater for 20-50 minutes. The beating degree is 10-50°SR, and the beating concentration is 2-4%;

4. Configure mixed pulp: in the mixing box, first put the pulp fiber pulp, then put the sepiolite fiber pulp, add water and stir, at the same time, put the adhesive, wet strength agent and The dry strength agent is put into the pulp mixing box in sequence, and is configured into a mixed pulp;

5. Copying and synthesis: the mixed pulp is sent to the fourdrinier machine for copying, and the process conditions are:

Speed 0.5-2m/min;

Copy width 250-550mm;

The online copying concentration is 0.2-2%;

Wet paper composite thickness 4-8mm;

The working surface is in the shape of net flower;

6. Drying cylinder heating:

The temperature of the drying cylinder is between 50-150°C, and the total drying time is 2-4 hours, of which

The initial temperature is 50-80°C, and the time is 0.5-1 hour;

Raise the temperature to 80-150°C for 1-2 hours; then lower the temperature to 80°C and keep it warm at 60-80°C for 0.5-1 hour;

Forming thickness is 3-6mm;

7. Shear forming: Cut the dried high-density fiber filter plate into shape as required.

The high-density fiber filter plate formula of the present invention adopts appropriate proportion of sepiolite fiber, which is a kind of natural non-metallic ore, non-toxic, tasteless, without any radioactive elements, and the fiber filter plate made of it , when used in the filtration of various Newtonian fluids involving humans or animals, there is no direct or indirect risk of harm. It is a modern filter material that provides necessary and critical conditions for clean or green production. The filtration accuracy of the fiber filter plate of the present invention is 0.1-50 μm, the filtration pressure is ≤5×10 ⁵ Pa, the filtration accuracy is higher or better than the prior art, and the cost is low, which is about 70% of the prior art, and the strength also meets the relevant requirements. According to industry regulations, it is especially suitable for the use of filter equipment such as filters with supporting mechanisms, plate and frame machines or presses.

Various materials in the manufacturing method of the fiber filter plate of the present invention are designed with heating activation treatment and high-temperature disinfection process, so it can ensure that the fiber filter plate does not contain any toxic substances, is safe and hygienic, and is completely suitable for the filtration production involving liquids for human use . The manufacturing method of the fiber filter plate of the present invention has no special requirements on the equipment used, and can use current common equipment and instruments, so it has the advantages of simplicity, convenience, easy operation and convenient implementation.

Detailed ways

The present invention will be further described below in conjunction with embodiment:

The weight percent formula of a kind of high-density fiber filter plate (hereinafter referred to as filter plate) designed by the present invention is:

Sepiolite fiber 15-68;

Pulp fiber 25-84.3;

Adhesive 0.1-2;

Wet strength agent 0.5-3;

Dry strength agent 0.1-2

The sepiolite fiber refers to a sepiolite fiber with a diameter of 10-100 μm and a length of 200-1000 μm; pulp fiber refers to any one of inorganic fibers or plant fibers, or a mixture of two or more pulps fiber; adhesive refers to polyvinyl alcohol or epoxy resin; wet strength agent refers to polyethyleneimine (PEI), polyamide epoxy resin (PAE) or melamine; dry strength agent refers to carboxymethylcellulose or polypropylene amide (PAM).

The filter plate formulations of the prior art do not contain any sepiolite fibers and therefore do not have the efficacy provided by the sepiolite fibers. The reason why the sepiolite fiber content of the filter plate of the present invention is selected as 10-65% is through a large number of experimental studies, because the content of the sepiolite fiber will directly affect the filtration accuracy and strength of the filter plate of the present invention. Generally speaking, if the content of sepiolite fiber is high, the filtration accuracy of the filter plate will be higher, and the flexibility of the filter plate will be better, but if the content is too high, the strength of the filter plate will be weakened, so the content of sepiolite fiber should be controlled within a reasonable range. There are two types of sepiolite: α-type sepiolite and β-type sepiolite. α-type sepiolite is a fibrous substance, which becomes sepiolite fiber after crushing. The β-type sepiolite is granular after crushing. The filter plate of the present invention needs to use α-type sepiolite. The said sepiolite fiber refers to the product obtained after proper pulverization of α-type sepiolite.

The adhesive in the filter plate formula of the present invention can increase the binding force between the fibers, thereby increasing the strength of the filter plate; the wet strength agent is selected in the formula to consider that the working environment of the filter plate is in the liquid, and the sepiolite is soaked in water. The reason why the intensity will become lower. In order to ensure the working strength of the filter plate in the liquid, a wet strength agent is added in the design. Too much wet strength agent is a waste, too little will not achieve the above effect, and a reasonable ratio should be designed; in the same way, the dry strength agent selected in the formula is to make the filter plate maintain a certain strength after drying. The content ratio should also be reasonable.

A further feature of the filter plate of the present invention is that a retention and drainage aid and a sedimentation agent are also designed in the formula. The role of adding retention and drainage aids is to further enhance the filtration function of the filter plate, and the role of adding a precipitant is to further increase the binding force of the wet plate fibers. The retention and drainage aid refers to polyacrylamide or polyamide (PPE); the precipitation agent refers to aluminum sulfate. The present invention has added the retention and drainage aid and the weight percent formula after the precipitating agent is:

Sepiolite fiber 15-64;

Pulp fiber 25-83.7;

Adhesive 0.1-2;

Wet strength agent 0.5-3;

Dry strength agent 0.1-2;

Retention and drainage aid 0.5-2;

Precipitant 0.1-2.

Filter plate manufacturing method of the present invention comprises following process:

1. Preparation of sepiolite fiber: superfinely pulverize the selected α-type sepiolite ore particles, and use the method of first screening and then winnowing to obtain the sea foam with a diameter of 10-100 μm and a length of 200-1000 μm. Foam fiber;

2. Sepiolite fiber beating: first heat the above-mentioned sepiolite fiber, the temperature range is 30-220°C, and the heating time is 1-3h; then use a standard beater to break it up for 2-5min, and then beat it with a beater for 5 minutes -10min, the beating degree is 60-90°SR, and the beating concentration is 1-3%; the beating degree of sepiolite fiber should not be too low, otherwise the fiber will be cut off;

3. Pulp fiber beating: Disperse the pulp fiber with a standard breaker for 20-50 minutes, and then beat it with a beater for 20-50 minutes. The beating degree is 10-50°SR, and the beating concentration is 2-4%;

4. Configure mixed pulp: in the mixing box, first put the pulp fiber pulp, then put the sepiolite fiber pulp, add water and stir evenly, at the same time, put the adhesive and wet strength agent in the stated proportion and dry strength agent into the slurry mixing box in order to configure a mixed slurry;

5. Copying and synthesis: the mixed pulp is sent to the fourdrinier machine for copying, and the process conditions are:

Speed 0.5-2m/min;

Copy width 250-550mm;

The online copying concentration is 0.2-2%;

Wet paper composite thickness 4-8mm;

The working surface is in the shape of net flower;

6. Drying cylinder heating:

The temperature of the drying cylinder is between 50-150°C, and the total drying time is 2-4 hours, of which

The initial temperature is 50-80°C, and the time is 0.5-1 hour;

Raise the temperature to 80-150°C, and the time is 1-2 hours; hold the temperature at 70-100°C, and the time is 0.5-1 hour;

Forming thickness is 3-6mm;

7. Cutting and forming: cut and shape the dried fiber filter plate according to the requirements. For example, the sepiolite high-density fiber filter plate of the present invention can be cut into a square plate of 200×200, 300×300, 400×400 or 500×500mm, or a circular plate with a diameter of φ=200-400mm, or Plates, etc. that meet the shape requirements of various filters with support mechanisms.

When the improved formula is used in the manufacturing method of the filter plate of the present invention, the added retention and drainage aids and sedimentation agents are used in the process (4) to configure the mixed slurry. The specific process is that after putting the adhesive, wet strength agent and dry strength agent in the stated proportions into the slurry mixing box in sequence, then put the retention and drainage aids and sedimentation aids in the stated proportions into the slurry mixing box in sequence In the box, it is configured as a mixed slurry. The rest of the process is the same as before.

The technical content not specified in the method of the present invention is all the same as the existing technology of manufacturing fiber filter plates, and those skilled in the art can implement it without creative work.

Provide specific embodiments of the present invention below:

Example 1

The formula of the filter plate is (% by weight): sepiolite fiber 30, pulp fiber 65, adhesive polyvinyl alcohol 2, wet strength agent polyethyleneimine 2 and dry strength agent polyacrylamide 1. Its manufacturing method is:

1. Preparation of sepiolite fiber: Superfinely pulverize the selected sepiolite ore particles with a pulverizer, and obtain 300g of sepiolite fiber with a diameter of 10 μm and a length of 200 μm after wind screening;

2. Sepiolite fiber beating: first heat the above-mentioned sepiolite fiber, the heating temperature is 220°C, the heating time is 3 hours, it is dispersed in a standard beater for 3 minutes, and it is beaten in a VALLEY beater for 10 minutes. The beating concentration is 3% (i.e. adding 10Kg of water), the beating degree is 90 ° SR, and the sepiolite fiber pulp is obtained;

3. Pulp fiber beating: use 700g of kapok fiber to break up in a standard breaker for 30 minutes, then use a VALLEY beater to beat for 30 minutes, the beating concentration is 3% (that is, add water 23Kg), the beating time is 30 minutes, and the beating degree is 30°SR;

4. Configure the mixed pulp: put the above-mentioned kapok fiber pulp and sepiolite fiber pulp into the pulp mixing tank in sequence, add 66Kg of water, stir evenly, the pulp concentration is 1%, and then put the adhesive polyvinyl alcohol in turn 500g, stir; add 500g of wet strength agent polyethylenimine, stir; add 300g of dry strength agent polyacrylamide; configure as a mixed slurry.

5. Papermaking and synthesis: the mixed pulp is sent to fourdrinier machine for papermaking, and the process conditions are: speed 1m/min, papermaking width 400mm, papermaking concentration 1% on the Internet, paper synthesis, and synthetic thickness (wet paper) is 5mm , The front side is pasted with textured paper 0.2mm thick;

6. Drying cylinder heating: the temperature of the drying cylinder is controlled between 50-120°C, and the total drying time is 3.5 hours, of which the initial temperature is 50°C, and the heating time is 0.5 hours; when the temperature is raised to 120°C, the heating time is 2 Hours; after the temperature is naturally lowered to 80°C, the holding time is 1 hour, and the molding thickness is 4mm;

7. Shearing and forming: shape the dried filter plate and cut it into a sepiolite high-density fiber filter plate of 300×300mm and thickness of 4mm±(0.5mm).

After testing, the filtration accuracy of the sepiolite high-density fiber filter plate is 0.3-0.5 μm, and the filtration pressure is ≤5×10 ⁵ Pa.

Example 2

The formula of the filter plate is (% by weight): sepiolite fiber 19, pulp fiber 75, adhesive polyvinyl alcohol 1.5, wet strength agent polyamide epoxy resin 2, dry strength agent carboxymethyl cellulose 1, retention and drainage aid Agent polyamide 1, precipitant aluminum sulfate 0.5. Its manufacturing method is:

1. Preparation of sepiolite fiber: the selected sepiolite ore particles are ultra-finely crushed with a pulverizer, and 200g of sepiolite fiber with a diameter of 10 μm and a length of 200 μm is obtained after wind screening;

2. Sepiolite fiber beating: first heat the above-mentioned sepiolite fiber, the heating temperature is 100°C, the heating time is 2 hours, it is dispersed in a standard beater for 4 minutes, and it is beaten in a VALLEY beater for 10 minutes. The beating concentration is 2% (i.e. adding 10Kg of water), the degree of beating is 80 ° SR, and the sepiolite fiber pulp is obtained;

3. Pulp fiber beating: use 400g of wood pulp fiber and 400g of straw pulp fiber to break up for 40 minutes in a standard breaker, and then beat for 40 minutes with a VALLEY beater. , beating degree 40°SR;

4. Configure mixed pulp: Put the two kinds of pulp obtained above, kapok fiber pulp and sepiolite fiber pulp, into the slurry mixing tank one after another, add 16Kg of water, stir evenly, the pulp concentration is 1%, and then put the adhesive polyvinyl alcohol in turn 200g, stir; put in 200g of wet strength agent polyamide epoxy resin, stir; put in 200g of dry strength agent carboxymethyl cellulose; put in 200g of retention and drainage aid polyamide; put in 200g of precipitant aluminum sulfate, configure into a mixed slurry.

5. Papermaking and synthesis: the mixed pulp is sent to fourdrinier machine for papermaking, the process conditions are: speed of vehicle 2m/min, papermaking width 450mm, online papermaking concentration 1.5%, paper synthesis, synthesis thickness (wet paper) is 5.3 mm, front textured paper 0.2mm thick;

6. Drying cylinder heating: The temperature of the drying cylinder is controlled between 50-120°C, and the total drying time is 2 hours, of which the initial temperature is 70°C, and the heating time is 0.5 hours; when the temperature is raised to 130°C, the heating time is 1 Hours; after the temperature is naturally lowered to 70°C, the holding time is 0.5 hours, and the molding thickness is 5mm;

7. Shearing and forming: shape the dried filter plate and cut it into a sepiolite high-density fiber filter plate with a thickness of 5mm±(0.5mm) of 400×400mm.

After testing, the filtration precision of the sepiolite high-density fiber filter plate is 0.5-1 μm, and the filtration pressure is ≤5×10 ⁵ Pa.

Example 3

The formula of the filter plate is (weight%): sepiolite fiber 65, pulp fiber 28, adhesive epoxy resin 2, wet strength agent melamine 3, dry strength agent polyacrylamide 2.

The manufacturing method of fiber filter plate is:

1. Preparation of sepiolite fiber: Superfine crush the selected sepiolite ore particles with a pulverizer, and obtain 700g of sepiolite fiber with a diameter of 10 μm and a length of 200 μm after wind screening;

2. Sepiolite fiber beating: first heat the above-mentioned sepiolite fiber, the heating temperature is 50°C, the heating time is 2 hours, it is dispersed in a standard beater for 3 minutes, and it is beaten in a VALLEY beater for 5 minutes. The beating concentration is 1% (i.e. adding 70Kg of water), the degree of beating is 85 ° SR, and the sepiolite fiber slurry is obtained;

3. Pulp fiber beating: Use 300g of wood pulp fiber, break it in a standard breaker for 20 minutes, and then use a VALLEY beater to beat it for 50 minutes. SR;

4. Configure the mixed pulp: Put the above-mentioned kapok fiber pulp and sepiolite fiber pulp into the slurry mixing tank one after another, add 122.5Kg of water, stir evenly, the pulp concentration is 0.5%, and then put the adhesive epoxy in turn Add 200g of resin and stir; put in 500g of wet strength agent melamine and stir; put in 200g of dry strength agent polyacrylamide; configure it into a mixed slurry.

5. papermaking and synthesis: the mixed pulp is sent to fourdrinier machine for papermaking, the process conditions are: speed of vehicle 0.5m/min, papermaking width 350mm, online papermaking concentration 0.5%, paper synthesis, synthesis thickness (wet paper) is 4.5mm, front textured paper 0.15mm thick;

6. Drying cylinder heating: The temperature of the drying cylinder is controlled between 80-150°C, and the total drying time is 4 hours, of which the initial temperature is 80°C, and the heating time is 1 hour; when the temperature is raised to 150°C, the heating time is 2 hours. Hours; after the temperature is naturally lowered to 80°C, the holding time is 1 hour, and the molding thickness is 4mm;

7. Shearing and forming: shape the dried filter plate and cut it into a sepiolite high-density fiber filter plate of 300×300mm and thickness of 4mm±(0.5mm).

After testing, the filtration accuracy of the sepiolite high-density fiber filter plate is 0.1-0.3 μm, and the filtration pressure is ≤5×10 ⁵ Pa.

Claims (4)

1. high-density fiber filter, its percentage by weight prescription is:

Sepiolite fibre 15-68;

Paper pulp fiber 25-84.3;

Adhesive 0.1-2;

Wet strength agent 0.5-3;

Drying strengthening agent 0.1-2

Described sepiolite fibre is meant that diameter is that 10-100 μ m, length are the sepiolite fibre of 200-1000 μ m;

Paper pulp fiber be meant in inorfil or the string any, the paper pulp fiber of two or more mixing;

Adhesive is meant polyvinyl alcohol or epoxy resin;

Wet strength agent is meant polymine (PEI), daiamid epoxy resin (PAE) or melamine;

Drying strengthening agent is meant carboxymethyl cellulose or polyacrylamide (PAM).

2. high-density fiber filter according to claim 1 is characterized in that also containing in the described prescription retention and drainage aid agent and precipitating reagent, and its percentage by weight prescription is:

Sepiolite fibre 15-64;

Paper pulp fiber 25-83.7;

Adhesive 0.1-2;

Wet strength agent 0.5-3;

Drying strengthening agent 0.1-2

Retention and drainage aid agent 0.5-2;

Precipitating reagent 0.1-2.

Described retention and drainage aid agent is meant polyacrylamide or polyamide (PPE); Described precipitating reagent is meant aluminum sulfate.

3. manufacture method according to the described high-density fiber filter of claim 1 comprises following technical process:

(1) produces sepiolite fibre:, after the pneumatic jig choosing, produce to such an extent that described diameter is that 10-100 μ m, length are the sepiolite fibre of 200-1000 μ m with the sepiolite ore particle ultra-fine grinding of choosing;

(2) sepiolite fibre making beating: above-mentioned sepiolite fibre is heated temperature range 30-220 ° of C, warm-up time 1-3h earlier; Break up 2-5min with the standard dispersing device again, with the beater 5-10min that pulls an oar, beating degree is 60-90 ° of SR thereafter, and beating consistency is 1-3%;

(3) paper pulp fiber making beating: paper pulp fiber is broken up 20-50min with the standard dispersing device, and with the beater 20-50min that pulls an oar, beating degree is 10-50 ° of SR again, and beating consistency is 2-4%;

(4) configuration mixes slurry: in stuff box, put into described paper pulp fiber slurry earlier, put into described sepiolite fibre slurry again, add water and stir, simultaneously, the adhesive of described ratio, wet strength agent and drying strengthening agent are put into stuff box in order, be configured to mix slurry;

(5) manufacture paper with pulp with synthetic: send fourdrinier to manufacture paper with pulp in the described slurry that mixes, process conditions are:

Speed of a motor vehicle 0.5-2m/min;

Copy wide 250-550mm;

The concentration 0.2-2% that manufactures paper with pulp surfs the Net;

The l Water Paper page or leaf synthesizes thickness 4-8mm;

Working face becomes net flower shape;

(6) drying cylinder is heated:

Dryer temperature is controlled between 50-150 ℃, and oven dry total time is 2-4 hour, and wherein initial temperature 50-80 ℃, the time is 0.5-1 hour;

Promote 80-150 ℃ of temperature, the time is 1-2 hour; Be cooled to 80 ℃ and insulation then, holding temperature 60-80 ℃, the time is 0.5-1 hour;

Molding thickness is 3-6mm;

(7) shear forming: shear shaping on request.

4. according to the manufacture method of the described high-density fiber filter of claim 3, it is characterized in that described technical process (4) configuration mixes in the sizing process, after the adhesive of described ratio, wet strength agent and drying strengthening agent are put into stuff box in order, again the retention and drainage aid agent of the described ratio of claim 2 and precipitating reagent are put into stuff box in order, be configured to mix slurry.