CN106192581A - Quantitative filter paper and preparation method thereof at a slow speed - Google Patents

Abstract

The present invention provides one quantitative filter paper at a slow speed, is three-decker from the face that flows to of filter paper to effluent face, and the intermediate layer of described three-decker is counted by weight, including 20 40 parts of softwood pulps, the hardwood pulp of 20 40 parts and 10 30 parts of bamboo pulps；The described surface layer that flows to is counted by weight, including 20 40 parts of softwood pulps, the cotton of short staple oar of 30 80 parts and 20 40 parts of Herba Poae Sphondylodis slurries, described outflow surface layer is counted by weight, including 20 40 parts of hardwood pulps, 20 40 parts of Herba Poae Sphondylodis slurries of cotton of short staple oar of 30 80 parts；Described softwood pulp, hardwood pulp, cotton of short staple oar, Herba Poae Sphondylodis slurry soak with Fluohydric acid. and hydrochloric acid mixed solution respectively, then neutralize through alkali, finally clean obtain with the exchanged pure water of ion or distilled water.This at a slow speed quantitative filter paper filter paper there is absorbent properties are good, length in service life, wet strength are good, compressive strength the is high feature of filtration.

Description

Quantitative filter paper and preparation method thereof at a slow speed

Technical field

The present invention relates to filter paper technical field, be specifically related to one quantitative filter paper and preparation method thereof at a slow speed.

Background technology

Quantitative filter paper, namely quantitative analysis filter paper, after calcination, residual ash is little, and analysis result is nearly free from shadowRing, be suitable to make precise quantitative analysis；The amount of ash is produced less than 0.0009% after ashing.But existing quantitative filter paper uses singleThe wood pulp of one is as raw material, for this Single Fiber material, in order to improve filtering accuracy will reduced bore, thus can increaseFiltration resistance, shortens physical life；In order to reduce filtration resistance, increase the service life it is necessary to hole diameter enlargement, but can reduceFilter precision, so being difficult to the regulation by microscopic void to balance the performance parameter such as filtering accuracy and filtration resistance；Additionally suchThe poor water resistance of quantitative filter paper, it is run-down that the filtration through the short time is just easily caused paper.

Summary of the invention

For the deficiencies in the prior art, the present invention provides and a kind of filters that absorbent properties are good, length in service life, water-tolerant,The quantitative filter paper at a slow speed that compressive strength is high, the rate of filtration is fast, present invention also offers the preparation method of this quantitative filter paper at a slow speed.

For realizing goal of the invention, the technical scheme that the present invention takes is:

Quantitative filter paper at a slow speed, is three-decker from the face that flows to of filter paper to effluent face, the intermediate layer of described three-deckerCount by weight, including 20-40 part softwood pulp, the hardwood pulp of 20-40 part and 10-30 part bamboo pulp；Described flows to faceLayer is counted by weight, starches including 20-40 part softwood pulp, the cotton of short staple oar of 30-80 part and 20-40 part Herba Poae Sphondylodis, describedFlowing out surface layer to count by weight, the cotton of short staple oar 20-40 part Herba Poae Sphondylodis including 20-40 part hardwood pulp, 30-80 part is starched；InstituteSoftwood pulp, hardwood pulp, cotton of short staple oar, bamboo pulp, Herba Poae Sphondylodis slurry use Fluohydric acid. respectively and the hydrochloric acid mixed solution stated soak, then warpAlkali neutralizes, and pure water or distilled water that finally use ion is exchanged are cleaned and obtained.

As preferably, the described alpha-cellulose content in quantitative filter paper at a slow speed is 98%-99%.

As preferably, the most quantification of 80 ± 4.0g/m², flow to the quantification of 30 ± 2g/m of surface layer², intermediate layer is 20 ± 1g/m², outflow surface layer is 30 ± 2g/m²。

The invention still further relates to the processing technology of above-mentioned quantitative filter paper at a slow speed, the technological means taked is:

The preparation method of a kind of quantitative filter paper at a slow speed, comprises the steps:

1) by described softwood pulp, hardwood pulp, bamboo pulp, cotton of short staple oar and Herba Poae Sphondylodis slurry respectively with Fluohydric acid. and hydrochloric acidMixed liquid dipping, then neutralize through alkali, pure water or distilled water that finally use ion is exchanged are cleaned and are obtained slurry；

2) preparation flows to surface layer, softwood pulp, cotton of short staple oar and Herba Poae Sphondylodis slurry defiberizing machine is carried out by dosageDiscongesting, then polish online through double disc refiner and obtain pulp, slurry degree is 21-24 ° of SR, and slurry is placed in many laminar flows oarOne layer in case is shaped by forming net drainage, obtains flowing to surface layer；

3) prepare intermediate layer slurry, dredge by the softwood pulp of dosage, hardwood pulp and bamboo pulp defiberizing machineSolving, then polish online through double disc refiner and obtain pulp, slurry degree is 21-24 ° of SR；

4) surface layer slurry is flowed out in preparation, enters by dosage hardwood pulp, cotton of short staple oar and Herba Poae Sphondylodis slurry defiberizing machineRow is discongested, then polishes online through double disc refiner and obtain pulp, and slurry degree is 21-24 ° of SR；

5) by step 3) the intermediate layer slurry that obtains is also placed in step 2) in many laminar flows oar case, by its slurry stream slowlyEntering to flowing to surface layer and carry out liquid-solid composite, then drainage and formation obtains two-layer composite bed；

6) by step 4) the effluent face slurry that obtains is also placed in step 2) in many laminar flows oar case, by its slurry stream slowlyThe two-layer composite bed entered to drying carries out liquid-solid composite, and then drainage and formation obtains three layers of composite bed, is dried.

The layer being obtained fiber filter paper by the method does not has obvious interface, layer to be to twine completely with the fiber of interlayer with interlayerAround weave in, being even difficult to define the position of each layer, whole fiber filter paper is a structure completed.The intensity of paper byMany factors determines, most important factor is fibrous binding force, and in fibrous binding force, Hydrogen bonding forces plays very importantEffect, the filter paper obtained by the method, layer and interlayer more likely by even level hydrone and fiber formed fiber-water-The loosely connected hydrogen bonded of fiber, this Hydrogen bonding forces layer combines with fiber with the fiber of interlayer, make layer withInterlayer has intensity, so that the intensity enhancing of whole fiber filter paper, all controls the beating degree of three layers at 21-24 ° simultaneouslySR, it is ensured that the pore size control of whole quantitative filter paper at a slow speed, at 1～3 micron, meets often filtration 100 milliliters and is not more than 120 secondsRequirement.

Detailed description of the invention

The invention is further illustrated by the following examples, but the present invention is not limited solely to following example.

Embodiment 1

Quantitative filter paper at a slow speed, is three-decker from the face that flows to of filter paper to effluent face, the intermediate layer of described three-deckerCount by weight, including 20 parts of softwood pulps, the hardwood pulp of 40 parts and 10 parts of bamboo pulps；Described flows to surface layer by weightNumber meter, including 20 parts of softwood pulps, the cotton of short staple oar of 30 parts and 20 parts of Herba Poae Sphondylodis slurries, described outflow surface layer is by weightMeter, including 20 parts of hardwood pulps, the cotton of short staple oar of 30 parts and 20 parts of Herba Poae Sphondylodis slurries；Described softwood pulp, hardwood pulp, bamboo pulpCotton of short staple oar and Herba Poae Sphondylodis slurry soak with Fluohydric acid. and hydrochloric acid mixed solution respectively, then neutralize through alkali, finally exchanged with ionPure water or distilled water are cleaned and are obtained, and the described alpha-cellulose content in quantitative filter paper at a slow speed is 98%.

The most quantification of 80 ± 4.0g/m², flow to the quantification of 30 ± 2g/m of surface layer², intermediate layer is 20 ± 1g/m², flow out surface layerIt is 30 ± 2g/m²。

The invention still further relates to the processing technology of above-mentioned quantitative filter paper at a slow speed, the technological means taked is:

The preparation method of a kind of quantitative filter paper at a slow speed, comprises the steps:

1) by described softwood pulp, hardwood pulp, bamboo pulp, cotton of short staple oar and Herba Poae Sphondylodis slurry respectively with Fluohydric acid. and hydrochloric acidMixed liquid dipping, then neutralize through alkali, pure water or distilled water that finally use ion is exchanged are cleaned and are obtained slurry；

2) preparation flows to surface layer, softwood pulp, cotton of short staple oar and Herba Poae Sphondylodis slurry defiberizing machine is carried out by dosageDiscongesting, then polish online through double disc refiner and obtain pulp, slurry degree is 21-24 ° of SR, and slurry is placed in many laminar flows oarOne layer in case is shaped by forming net drainage, obtains flowing to surface layer；

3) prepare intermediate layer slurry, dredge by the softwood pulp of dosage, hardwood pulp and bamboo pulp defiberizing machineSolving, then polish online through double disc refiner and obtain pulp, slurry degree is 21-24 ° of SR；

4) surface layer slurry is flowed out in preparation, enters by dosage hardwood pulp, cotton of short staple oar and Herba Poae Sphondylodis slurry defiberizing machineRow is discongested, then polishes online through double disc refiner and obtain pulp, and slurry degree is 21-24 ° of SR；

5) by step 3) the intermediate layer slurry that obtains is also placed in step 2) in many laminar flows oar case, by its slurry stream slowlyEntering to flowing to surface layer and carry out liquid-solid composite, then drainage and formation obtains two-layer composite bed；

6) by step 4) the effluent face slurry that obtains is also placed in step 2) in many laminar flows oar case, by its slurry stream slowlyThe two-layer composite bed entered to drying carries out liquid-solid composite, and then drainage and formation obtains three layers of composite bed, is dried.

Embodiment 2

Quantitative filter paper at a slow speed, is three-decker from the face that flows to of filter paper to effluent face, the intermediate layer of described three-deckerCount by weight, including 40 parts of softwood pulps, the hardwood pulp of 20 parts and 30 parts of bamboo pulps；Described flows to surface layer by weightNumber meter, including 40 parts of softwood pulps, the cotton of short staple oar of 80 parts and 40 parts of Herba Poae Sphondylodis slurries, described outflow surface layer is by weightMeter, including 40 parts of hardwood pulps, the cotton of short staple oar of 30 parts and 40 parts of Herba Poae Sphondylodis slurries；Described softwood pulp, hardwood pulp, bambooSlurry, cotton of short staple oar and Herba Poae Sphondylodis slurry soak with Fluohydric acid. and hydrochloric acid mixed solution respectively, then neutralize through alkali, finally exchanged with ionPure water or distilled water clean obtain, the described alpha-cellulose content in quantitative filter paper at a slow speed is 99%.

As preferably, the most quantification of 80 ± 4.0g/m², flow to the quantification of 30 ± 2g/m of surface layer², intermediate layer is 20 ± 1g/m², outflow surface layer is 30 ± 2g/m²。

The invention still further relates to the processing technology of above-mentioned quantitative filter paper at a slow speed, the technological means taked is:

The preparation method of a kind of quantitative filter paper at a slow speed, comprises the steps:

1) by described softwood pulp, hardwood pulp, bamboo pulp, cotton of short staple oar and Herba Poae Sphondylodis slurry respectively with Fluohydric acid. and hydrochloric acidMixed liquid dipping, then neutralize through alkali, pure water or distilled water that finally use ion is exchanged are cleaned and are obtained slurry；

2) preparation flows to surface layer, softwood pulp, cotton of short staple oar and Herba Poae Sphondylodis slurry defiberizing machine is carried out by dosageDiscongesting, then polish online through double disc refiner and obtain pulp, slurry degree is 21-24 ° of SR, and slurry is placed in many laminar flows oarOne layer in case is shaped by forming net drainage, obtains flowing to surface layer；

3) prepare intermediate layer slurry, dredge by the softwood pulp of dosage, hardwood pulp and bamboo pulp defiberizing machineSolving, then polish online through double disc refiner and obtain pulp, slurry degree is 21-24 ° of SR；

4) surface layer slurry is flowed out in preparation, enters by dosage hardwood pulp, cotton of short staple oar and Herba Poae Sphondylodis slurry defiberizing machineRow is discongested, then polishes online through double disc refiner and obtain pulp, and slurry degree is 21-24 ° of SR；

5) by step 3) the intermediate layer slurry that obtains is also placed in step 2) in many laminar flows oar case, by its slurry stream slowlyEntering to flowing to surface layer and carry out liquid-solid composite, then drainage and formation obtains two-layer composite bed；

6) by step 4) the effluent face slurry that obtains is also placed in step 2) in many laminar flows oar case, by its slurry stream slowlyThe two-layer composite bed entered to drying carries out liquid-solid composite, and then drainage and formation obtains three layers of composite bed, is dried.

Embodiment 3

Quantitative filter paper at a slow speed, is three-decker from the face that flows to of filter paper to effluent face, the intermediate layer of described three-deckerCount by weight, including 30 parts of softwood pulps, the hardwood pulp of 20 parts and 20 parts of bamboo pulps；Described flows to surface layer by weightNumber meter, including 30 parts of softwood pulps, the cotton of short staple oar of 60 parts and 35 parts of Herba Poae Sphondylodis slurries, described outflow surface layer is by weightMeter, including 40 parts of hardwood pulps, the cotton of short staple oar of 50 parts and 30 parts of Herba Poae Sphondylodis slurries；Described softwood pulp, hardwood pulp, bambooSlurry, cotton of short staple oar and Herba Poae Sphondylodis slurry soak with Fluohydric acid. and hydrochloric acid mixed solution respectively, then neutralize through alkali, finally exchanged with ionPure water or distilled water clean obtain, the described alpha-cellulose content in quantitative filter paper at a slow speed is 98%.

As preferably, the most quantification of 80 ± 4.0g/m², flow to the quantification of 30 ± 2g/m of surface layer², intermediate layer is 20 ± 1g/m², outflow surface layer is 30 ± 2g/m²。

The invention still further relates to the processing technology of above-mentioned quantitative filter paper at a slow speed, the technological means taked is:

The preparation method of a kind of quantitative filter paper at a slow speed, comprises the steps:

1) by described softwood pulp, hardwood pulp, bamboo pulp, cotton of short staple oar and Herba Poae Sphondylodis slurry respectively with Fluohydric acid. and hydrochloric acidMixed liquid dipping, then neutralize through alkali, pure water or distilled water that finally use ion is exchanged are cleaned and are obtained slurry；

2) preparation flows to surface layer, softwood pulp, cotton of short staple oar and Herba Poae Sphondylodis slurry defiberizing machine is carried out by dosageDiscongesting, then polish online through double disc refiner and obtain pulp, slurry degree is 21-24 ° of SR, and slurry is placed in many laminar flows oarOne layer in case is shaped by forming net drainage, obtains flowing to surface layer；

3) prepare intermediate layer slurry, dredge by the softwood pulp of dosage, hardwood pulp and bamboo pulp defiberizing machineSolving, then polish online through double disc refiner and obtain pulp, slurry degree is 21-24 ° of SR；

4) surface layer slurry is flowed out in preparation, enters by dosage hardwood pulp, cotton of short staple oar and Herba Poae Sphondylodis slurry defiberizing machineRow is discongested, then polishes online through double disc refiner and obtain pulp, and slurry degree is 21-24 ° of SR；

5) by step 3) the intermediate layer slurry that obtains is also placed in step 2) in many laminar flows oar case, by its slurry stream slowlyEntering to flowing to surface layer and carry out liquid-solid composite, then drainage and formation obtains two-layer composite bed；

6) by step 4) the effluent face slurry that obtains is also placed in step 2) in many laminar flows oar case, by its slurry stream slowlyThe two-layer composite bed entered to drying carries out liquid-solid composite, and then drainage and formation obtains three layers of composite bed, is dried.

The technical specification of quantitative filter paper at a slow speed that above-described embodiment prepares is as shown in the table:

Claims (4)

1. Quantitative filter paper the most at a slow speed, it is characterised in that be three-decker from the face that flows to of filter paper to effluent face, described three-deckerIntermediate layer count by weight, including 20-40 part softwood pulp, the hardwood pulp of 20-40 part and 10-30 part bamboo pulp；DescribedThe surface layer that flows to count by weight, including 20-40 part softwood pulp, the cotton of short staple oar of 30-80 part and 20-40 part Herba Poae SphondylodisSlurry, described outflow surface layer is counted by weight, including 20-40 part hardwood pulp, cotton of short staple oar 20-40 part dragon of 30-80 partMoss is starched；Described softwood pulp, hardwood pulp, bamboo pulp, cotton of short staple oar, Herba Poae Sphondylodis slurry are respectively with Fluohydric acid. and hydrochloric acid mixed solutionSoak, then neutralize through alkali, finally clean with the exchanged pure water of ion or distilled water and obtain.
2. Quantitative filter paper at a slow speed the most according to claim 1, it is characterised in that the described alpha fibre in quantitative filter paper at a slow speedCellulose content is 98%-99%.
3. Quantitative filter paper at a slow speed the most according to claim 1, it is characterised in that the most quantification of 80 ± 4.0g/m², flow to surface layer fixedAmount is 30 ± 2g/m², intermediate layer is 20 ± 1g/m², outflow surface layer is 30 ± 2g/m²。
4. 4. the preparation method of the quantitative filter paper at a slow speed as described in claims 1 to 3 is arbitrary, it is characterised in that include walking as followsRapid:

   1) by described softwood pulp, hardwood pulp, bamboo pulp, cotton of short staple oar and Herba Poae Sphondylodis slurry respectively by Fluohydric acid. and mixed in hydrochloric acidImmersion is steeped, then neutralizes through alkali, finally cleans with the exchanged pure water of ion or distilled water and obtains slurry；

   2) preparation flows to surface layer, softwood pulp, cotton of short staple oar and Herba Poae Sphondylodis slurry defiberizing machine is discongested by dosage,Polishing online through double disc refiner and obtain pulp, slurry degree is 21-24 ° of SR, is placed in by slurry in many laminar flows oar caseOne layer shaped by forming net drainage, obtain flowing to surface layer；

   3) prepare intermediate layer slurry, discongest by the softwood pulp of dosage, hardwood pulp and bamboo pulp defiberizing machine, thenPolishing online through double disc refiner and obtain pulp, slurry degree is 21-24 ° of SR；

   4) surface layer slurry is flowed out in preparation, dredges by dosage hardwood pulp, cotton of short staple oar and Herba Poae Sphondylodis slurry defiberizing machineSolving, then polish online through double disc refiner and obtain pulp, slurry degree is 21-24 ° of SR；

   5) by step 3) the intermediate layer slurry that obtains is also placed in step 2) in many laminar flows oar case, by its slurry flowing into slowlyFlowing to surface layer and carry out liquid-solid composite, then drainage and formation obtains two-layer composite bed；

   6) by step 4) the effluent face slurry that obtains is also placed in step 2) in many laminar flows oar case, by its slurry flowing into slowlyThe two-layer composite bed of drying carries out liquid-solid composite, and then drainage and formation obtains three layers of composite bed, is dried.