CN109275953B - Preparation method of fiber-based cigarette filter - Google Patents
Preparation method of fiber-based cigarette filter Download PDFInfo
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- CN109275953B CN109275953B CN201811484793.3A CN201811484793A CN109275953B CN 109275953 B CN109275953 B CN 109275953B CN 201811484793 A CN201811484793 A CN 201811484793A CN 109275953 B CN109275953 B CN 109275953B
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
- A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
- A24D3/02—Manufacture of tobacco smoke filters
- A24D3/0204—Preliminary operations before the filter rod forming process, e.g. crimping, blooming
- A24D3/0208—Cutting filter materials
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
- A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
- A24D3/02—Manufacture of tobacco smoke filters
- A24D3/0204—Preliminary operations before the filter rod forming process, e.g. crimping, blooming
- A24D3/0212—Applying additives to filter materials
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
- A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
- A24D3/06—Use of materials for tobacco smoke filters
- A24D3/067—Use of materials for tobacco smoke filters characterised by functional properties
Abstract
The invention relates to a preparation method of a fiber-based cigarette filter tip, and belongs to the technical field of cigarettes. Firstly, preprocessing rush fibers by adopting a mixed solution of isopropanol and water, then carrying out suction filtration treatment and freeze drying on the preprocessed rush fibers under the infiltration of a water/ethanol mixed solution of polyvinylpyrrolidone to obtain modified rush fibers, cutting the modified rush fibers into strip fibers with equal length, closely arranging the strip fibers into cylinders along the axial direction, pressing the strips by a filter rod forming machine, and coating the strips by filter tip forming paper to obtain the fiber-based cigarette filter tip. The filter tip prepared by the invention has a compact porous structure, has no obvious influence on the cigarette resistance, is natural and degradable in raw materials, combines physical pore interception and chemical complexing adsorption, and can effectively reduce harmful components of tar and smoke.
Description
Technical Field
The invention relates to a preparation method of a fiber-based cigarette filter tip, and belongs to the technical field of cigarettes.
Background
Pollution and health hazards caused by smoking have become an urgent problem to be solved in the world. Tobacco smoke is a mixture of 3800 compounds that are aerosols composed of volatile, semi-volatile, and non-volatile compounds in a gas phase. Smokers smoke because they are addicted to nicotine. However, besides nicotine, cigarette smoke contains various toxic compounds, so that smokers can suffer from cancer. Despite many years of effort in the development of cigarette filters both domestically and abroad, most cigarette filters are still made of cellulose acetate. However, the conventional cellulose acetate filter is not ideal for removing toxic compounds from smoke. To improve the removal efficiency, additives such as activated carbon, zeolite and even carbon nanotubes have been added to the filter to adsorb or decompose toxic substances in the smoke.
On the other hand, the production of acetate from high-quality cellulose resources such as broad-leaved trees is a complicated chemical production process and must produce a large amount of pollution. Today, the standards for cigarette quality and environmental protection in industrial production are increasing, which further drives efforts to improve the efficiency of removal of toxic compounds from smoke. Therefore, it is highly desirable to develop new filter materials as replacements for acetate fibers or polypropylene synthetic fibers.
The Chinese patent publication No. CN108158034A discloses that the publication date is 6 months and 15 days in 2018, and the invention name is: the invention relates to a preparation method of a composite aerogel type cigarette filter tip material, which takes sepiolite as a raw material, modifies the sepiolite and re-compounds other substances to finally obtain the composite aerogel type filter tip material. Its advantages are high adsorptive effect to harmful substances in cigarette, and high mechanical performance. However, the auxiliary materials required for compounding are special, so that the materials are difficult to obtain, the cost is too high, and in addition, the raw materials cannot be naturally degraded, so that the difficulty is increased for the adsorption post-treatment, and the application to the disposable cigarettes in the mainstream at present is difficult.
Rush, a perennial herb, is usually dried in the sun and used as a medicine, and has the effects of clearing away heart-fire and inducing diuresis. In recent years, people find that a natural three-dimensional network structure exists in rush, and gradually begin to search for functions. Because the cigarette smoke contains micron-sized aerosol and the meshes inside the rush are mostly nano-sized, the rush is regarded as an ideal cigarette filter material.
The Chinese patent publication No. CN101347266B discloses a publication date of 2010, 12 months and 22 days, and has the invention name: the invention relates to a preparation method of a cigarette filter material, which takes rush as a raw material and forms cigarette adsorption particles through processes of loading treatment, drying, granulation and the like, thereby preparing the cigarette filter material. Its advantages are natural porous plant fibres as raw material, use of nano-class stereo netted structure to adsorb and intercept harmful substances, and low cost. But its adsorption mechanism mainly is physical adsorption, and adsorption effect for traditional filter tip promotes not greatly, and the granule does not possess the adhesion, easily leaks the granule after becoming the stick, and the practicality is not strong.
The Chinese patent publication No. CN2757604Y discloses a date of 2006, 2 months and 15 days, and has the name: the invention discloses a rush filter tip cigarette, which is characterized in that a small amount of strip rush is arranged in a cigarette filter tip in an axial direction to form a novel filter tip. Although the toxicity of cigarettes can be reduced, the rush is easy to break, the process of putting the rush into the filter stick is difficult, industrialization cannot be realized, physical adsorption is only carried out through a porous structure, the adsorption quantity of harmful substances in smoke is small, and the adsorption effect is poor.
At present, the action mechanism of the rush filter tip only stays in physical adsorption by utilizing a reticular structure, and although the action mechanism has good effect, the action mechanism is different from chemical adsorption generated by adding an additive, and is mainly reflected in the selectivity and the overall effect of adsorption.
Therefore, how to modify the rush, make it have multiple absorption concurrently at the filterable in-process of flue gas, promote the filter effect, and the finished product is stable, has the potentiality of industrialization, is current key problem.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for preparing a cigarette filter tip based on polyvinylpyrrolidone modified rush, so that smoke filtration and multiple adsorption are realized, and harmful substances such as tar in smoke are effectively reduced.
The preparation method of the fiber-based cigarette filter comprises the following steps:
preparation of washing solution
The washing liquid is prepared by uniformly mixing isopropanol and water and stirring, wherein the volume ratio of isopropanol to water is 98: 2-90: 10, the stirring speed is 50-600 r/min, and the stirring time is 1-10 min.
b preparation of modified solution
The method comprises the steps of putting polyvinylpyrrolidone into a mixed solution of ethanol and water, stirring and dissolving, and then carrying out defoaming treatment in a vacuum environment to obtain a modified solution, wherein the mass fraction of the polyvinylpyrrolidone is 3-10%, the volume ratio of the ethanol to the water is 95: 5-90: 10, the dissolving temperature is 40-80 ℃, the stirring speed is 50-600 r/min, the stirring time is 6-12 h, the vacuum degree in the vacuum environment is 0.05-0.1 MPa, and the defoaming treatment time is 8-12 h.
c pretreatment of rush
And (b) placing the juncus roemerianus into the washing liquid prepared in the step (a), carrying out ultrasonic treatment, and drying to obtain the pretreated juncus roemerianus, wherein the ultrasonic frequency is 20-60 kHz, the ultrasonic temperature is 10-35 ℃, the ultrasonic time is 15-20 min, the drying temperature is 40-60 ℃, and the drying time is 4-8 h.
Modification of rush
Placing the rush subjected to pretreatment in the step c in a Buchner funnel, soaking the rush in the modified solution prepared in the step b for negative pressure suction filtration, then placing the rush in a refrigerator for prefreezing, transferring the prefreezed rush into a freeze dryer after prefreezing is finished, and performing vacuum freeze drying to obtain the modified rush, wherein the suction filtration negative pressure is 0.3-0.5 MPa, the suction filtration time is 3-5 min, the prefreezing temperature is-40 to-30 ℃, the prefreezing time is 6-12 h, the vacuum degree of vacuum freeze drying is 0.1-0.3 MPa, the vacuum freeze drying temperature is-55 to-40 ℃, and the vacuum freeze drying time is 6-12 h.
Preparation of e-fiber based cigarette filters
And d, cutting the corduroy modified in the step d into strips, wherein the length of each strip is 2-3 cm, tightly arranging the strips into cylinders along the axial direction, pressing the cylinders by a filter rod forming machine, and coating the cylinders by filter tip forming paper to obtain the fiber-based cigarette filter tip, wherein the fiber-based cigarette filter tip contains 20-30 modified strips of corduroy.
The average molecular weight of the polyvinylpyrrolidone is 80000-130000.
Due to the adoption of the technical scheme, the invention is technically characterized in that: the corduroy is modified by adopting polyvinylpyrrolidone, the polyvinylpyrrolidone is a water-soluble high-molecular polymer, is odorless, tasteless and nontoxic, has good cohesiveness, and has viscosity increased along with the increase of average molecular weight, so that the polyvinylpyrrolidone can be well attached to the outer wall of the corduroy. When the average molecular weight is moderate, the water can well permeate into the net structure in the rush, and the tissue structure and the appearance form of the water are completely kept by adopting a vacuum freeze drying method under the condition of not influencing the physical structure and the molecular structure of the polyvinylpyrrolidone, and the through or closed pore or network structure is formed while the solvent is dehydrated, so that the pore channel blockage caused by the local uneven viscosity of the solution can be effectively avoided. The molecular structure of the polyvinylpyrrolidone has strong polarity and easy-to-form hydrogen-bonded phthalocyanine groups, so that the polyvinylpyrrolidone can be combined with some polar small molecules, meanwhile, oxygen atoms and nitrogen atoms in the molecules are typical coordination atoms, the polyvinylpyrrolidone can generate complexes with a plurality of different compounds, and when the polyvinylpyrrolidone is contacted with mainstream smoke, the water solubility of harmful substances which are insoluble in water in smoke aerosol is enhanced, more harmful substances are dissolved in water vapor, so that the harmful substances are condensed to form hydrogel, and the hydrogel is intercepted by meshes in the rush, thereby achieving the effect of filtering the harmful substances.
The filter material adopts strip corduroy, because the inside three-dimensional network structure of corduroy itself, carries out vortex and interception to the flue gas through wherein, can increase the flue gas and detain filterable time in filterable, the adsorption effect can show the promotion. And the inner aperture of the strip rush is uniform, smoke passes through the strip rush in the axial direction, the flow rate is stable, and the influence on the cigarette resistance is small. Physical pore interception and chemical complexing adsorption are combined, so that a good filtering effect is achieved. The cigarette filter tip prepared by the invention can effectively reduce tar and other harmful components in smoke, the material is natural and degradable, the porous structure is compact and stable, and the cigarette filter tip has no obvious influence on the cigarette resistance.
Detailed Description
The present invention will be described in detail with reference to specific examples.
The preparation method comprises the following steps:
preparation of washing solution
The washing liquid is prepared by uniformly mixing isopropanol and water and stirring, wherein the volume ratio of isopropanol to water is 98: 2-90: 10, the stirring speed is 50-600 r/min, and the stirring time is 1-10 min.
b preparation of modified solution
The method comprises the steps of putting polyvinylpyrrolidone into a mixed solution of ethanol and water, stirring and dissolving, and then carrying out defoaming treatment in a vacuum environment to obtain a modified solution, wherein the mass fraction of the polyvinylpyrrolidone is 3-10%, the volume ratio of the ethanol to the water is 95: 5-90: 10, the dissolving temperature is 40-80 ℃, the stirring speed is 50-600 r/min, the stirring time is 6-12 h, the vacuum degree in the vacuum environment is 0.05-0.1 MPa, and the defoaming treatment time is 8-12 h.
c pretreatment of rush
And (b) placing the juncus roemerianus into the washing liquid prepared in the step (a), carrying out ultrasonic treatment, and drying to obtain the pretreated juncus roemerianus, wherein the ultrasonic frequency is 20-60 kHz, the ultrasonic temperature is 10-35 ℃, the ultrasonic time is 15-20 min, the drying temperature is 40-60 ℃, and the drying time is 4-8 h.
Modification of rush
Placing the rush subjected to pretreatment in the step c in a Buchner funnel, soaking the rush in the modified solution prepared in the step b for negative pressure suction filtration, then placing the rush in a refrigerator for prefreezing, transferring the prefreezed rush into a freeze dryer after prefreezing is finished, and performing vacuum freeze drying to obtain the modified rush, wherein the suction filtration negative pressure is 0.3-0.5 MPa, the suction filtration time is 3-5 min, the prefreezing temperature is-40 to-30 ℃, the prefreezing time is 6-12 h, the vacuum degree of vacuum freeze drying is 0.1-0.3 MPa, the vacuum freeze drying temperature is-55 to-40 ℃, and the vacuum freeze drying time is 6-12 h.
Preparation of e-fiber based cigarette filters
And d, cutting the corduroy modified in the step d into strips, wherein the length of each strip is 2-3 cm, tightly arranging the strips into cylinders along the axial direction, pressing the cylinders by a filter rod forming machine, and coating the cylinders by filter tip forming paper to obtain the fiber-based cigarette filter tip, wherein the fiber-based cigarette filter tip contains 20-30 modified strips of corduroy.
The average molecular weight of the polyvinylpyrrolidone is 80000-130000.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Example one
The method comprises the following steps: mixing ethanol and water at a mass ratio of 90:10 to form a mixed solution, and stirring the mixed solution at the speed of 100r/min for 1min at room temperature to obtain a washing solution. Dissolving polyvinylpyrrolidone with average molecular weight of 80000 in 95:5 anhydrous ethanol/water mixed solution to form mixed solution with mass fraction of 3%, stirring the mixed solution at a speed of 50r/min for 8h in a water bath environment with the temperature of 50 ℃, and defoaming for 8h in an environment with the vacuum degree of 0.05MPa to obtain the modified solution. Immersing the rush fibers in a washing solution, carrying out ultrasonic treatment for 15min at 20kHz and 10 ℃, and then placing the rush fibers in a drying oven at 40 ℃ for drying for 4h to obtain the pretreated rush fibers. Placing the pretreated rush fibers in a Buchner funnel, performing suction filtration for 3min under the negative pressure of 0.3MPa under the infiltration of a modification solution, then placing the rush fibers in a refrigerator at the temperature of-40 ℃ for pre-freezing for 6h, taking out the rush fibers, and then placing the rush fibers in a freeze dryer at the vacuum degree of 0.1MPa and the temperature of-55 ℃ for vacuum freeze-drying for 6h to obtain the modified rush. Taking 30 modified strip-shaped rush fibers with the length of 2cm, closely and directionally arranging the modified strip-shaped rush fibers, pressing the rush fibers by a filter rod forming machine, and then coating the rush fibers by filter tip forming paper to obtain the fiber-based cigarette filter tip.
Example two
The method comprises the following steps: mixing ethanol and water at a mass ratio of 91:9, and stirring the mixed solution at room temperature at a speed of 50r/min for 3min to obtain a washing solution. Dissolving polyvinylpyrrolidone with the average molecular weight of 90000 in an absolute ethyl alcohol/water mixed solution of 94:6 to form a mixed solution with the mass fraction of 5%, stirring the mixed solution at the speed of 100r/min for 6 hours in a water bath environment at the temperature of 40 ℃, and defoaming for 9 hours in an environment with the vacuum degree of 0.06MPa to obtain a modified solution. Immersing the rush fibers in a washing solution, carrying out ultrasonic treatment for 16min at 30kHz and 15 ℃, and then placing the rush fibers in a 45 ℃ oven for drying for 5h to obtain the pretreated rush fibers. Placing the pretreated rush fibers in a Buchner funnel, performing suction filtration for 3.5min under the negative pressure of 0.35MPa under the infiltration of a modification solution, then placing the rush fibers in a refrigerator at the temperature of-37 ℃ for prefreezing for 7h, taking out the rush fibers, and then placing the rush fibers in a freeze dryer at the vacuum degree of 0.15MPa and the temperature of-50 ℃ for vacuum freeze-drying for 7h to obtain the modified rush. Taking 28 modified strip-shaped rush fibers with the length of 2.5cm, closely and directionally arranging the rush fibers, pressing the rush fibers by a filter rod forming machine, and coating the rush fibers by filter tip forming paper to obtain the fiber-based cigarette filter tip.
EXAMPLE III
The method comprises the following steps: and (3) mixing ethanol and water according to a mass ratio of 93:7 to form a mixed solution, and stirring the mixed solution at the room temperature at a speed of 70r/min for 4min to obtain the washing liquid. Dissolving polyvinylpyrrolidone with average molecular weight of 80000 in 93:7 anhydrous ethanol/water mixed solution to form mixed solution with mass fraction of 6%, stirring the mixed solution at a speed of 200r/min for 7h in a water bath environment with the temperature of 60 ℃, and defoaming for 10h in an environment with the vacuum degree of 0.07MPa to obtain the modified solution. Immersing the rush fibers in a washing solution, carrying out ultrasonic treatment for 17min at 40kHz and 20 ℃, and then placing the rush fibers in a 50 ℃ drying oven for drying for 6h to obtain the pretreated rush fibers. Placing the pretreated rush fibers in a Buchner funnel, performing suction filtration for 4min under the negative pressure of 0.4MPa under the infiltration of a modification solution, then placing the rush fibers in a refrigerator at the temperature of minus 36 ℃ for pre-freezing for 8h, taking out the rush fibers, and then placing the rush fibers in a freeze dryer at the vacuum degree of 0.2MPa and the temperature of minus 45 ℃ for vacuum freeze-drying for 8h to obtain the modified rush. Taking 27 modified strip-shaped rush fibers with the length of 2.2cm, closely and directionally arranging the rush fibers, pressing the rush fibers by a filter rod forming machine, and coating the rush fibers by filter tip forming paper to obtain the fiber-based cigarette filter.
Example four
The method comprises the following steps: and (2) mixing ethanol and water according to a mass ratio of 95:5 to form a mixed solution, and stirring the mixed solution at the speed of 200r/min for 5min at room temperature to obtain the washing liquid. Dissolving polyvinylpyrrolidone with average molecular weight of 100000 in 95:5 anhydrous ethanol/water mixed solution to form mixed solution with mass fraction of 7%, stirring the mixed solution at the speed of 300r/min for 9h in the water bath environment with the temperature of 65 ℃, and defoaming for 8.5h in the environment with the vacuum degree of 0.08MPa to obtain the modified solution. Immersing the rush fibers in a washing solution, performing ultrasonic treatment for 18min at 45kHz and 25 ℃, and then drying in an oven at 55 ℃ for 7h to obtain the pretreated rush fibers. Placing the pretreated rush fibers in a Buchner funnel, performing suction filtration for 4.5min under the negative pressure of 0.45MPa under the infiltration of a modification solution, then placing the rush fibers in a refrigerator at the temperature of-35 ℃ for pre-freezing for 9h, taking out the rush fibers, and then placing the rush fibers in a freeze dryer at the vacuum degree of 0.25MPa and the temperature of-40 ℃ for vacuum freeze-drying for 9h to obtain the modified rush. Taking 25 modified strip-shaped rush fibers with the length of 2.3cm, closely and directionally arranging the rush fibers, pressing the rush fibers by a filter rod forming machine, and coating the rush fibers by filter tip forming paper to obtain the fiber-based cigarette filter tip.
EXAMPLE five
The method comprises the following steps: and (3) mixing ethanol and water according to a mass ratio of 96:4 to form a mixed solution, and stirring the mixed solution at the speed of 300r/min for 6min at room temperature to obtain the washing liquid. Dissolving polyvinylpyrrolidone with average molecular weight of 110000 in anhydrous ethanol/water mixed solution with the weight percentage of 92:8 to form mixed solution with the mass percentage of 8%, stirring the mixed solution at the speed of 400r/min for 10h in a water bath environment with the temperature of 70 ℃, and defoaming for 9.5h in an environment with the vacuum degree of 0.09MPa to obtain modified solution. Immersing the rush fibers in a washing solution, performing ultrasonic treatment at 50kHz and 30 ℃ for 19min, and then placing the rush fibers in a 60 ℃ drying oven for drying for 8h to obtain the pretreated rush fibers. Placing the pretreated rush fibers in a Buchner funnel, performing suction filtration for 5min under the negative pressure of 0.5MPa under the infiltration of a modification solution, then placing the rush fibers in a refrigerator at the temperature of minus 34 ℃ for pre-freezing for 10h, taking out the rush fibers, and then placing the rush fibers in a freeze dryer at the vacuum degree of 0.3MPa and the temperature of minus 50 ℃ for vacuum freeze-drying for 10h to obtain the modified rush. Taking 24 modified strip-shaped rush fibers with the length of 2.6cm, closely and directionally arranging the rush fibers, pressing the rush fibers by a filter rod forming machine, and coating the rush fibers by filter tip forming paper to obtain the fiber-based cigarette filter tip.
EXAMPLE six
The method comprises the following steps: and (3) mixing ethanol and water according to a mass ratio of 97:3, and stirring the mixed solution at the speed of 400r/min for 8min at room temperature to obtain the washing liquid. Dissolving polyvinylpyrrolidone with the average molecular weight of 120000 in 91:9 anhydrous ethanol/water mixed solution to form 9% mixed solution, stirring the mixed solution at the speed of 500r/min for 11h in a water bath environment at the temperature of 75 ℃, and defoaming the mixed solution for 11h in an environment with the vacuum degree of 0.06MPa to obtain the modified solution. Immersing the rush fibers in a washing solution, carrying out ultrasonic treatment for 20min at 55kHz and 35 ℃, and then placing the rush fibers in a drying oven at 40 ℃ for drying for 7.5h to obtain the pretreated rush fibers. Placing the pretreated rush fibers in a Buchner funnel, performing suction filtration for 3min under the negative pressure of 0.3MPa under the infiltration of a modification solution, then placing the rush fibers in a refrigerator at the temperature of-32 ℃ for pre-freezing for 11h, taking out the rush fibers, and then placing the rush fibers in a freeze dryer at the vacuum degree of 0.1MPa and the temperature of-42 ℃ for vacuum freeze-drying for 11h to obtain the modified rush. Taking 22 modified strip-shaped rush fibers with the length of 2.8cm, closely and directionally arranging the rush fibers, pressing the rush fibers by a filter rod forming machine, and coating the rush fibers by filter tip forming paper to obtain the fiber-based cigarette filter tip.
EXAMPLE seven
The method comprises the following steps: and (2) mixing ethanol and water according to a mass ratio of 98:2, and stirring the mixed solution at the speed of 600r/min for 10min at room temperature to obtain the washing liquid. Dissolving polyvinylpyrrolidone with the average molecular weight of 130000 in an absolute ethyl alcohol/water mixed solution with the mass fraction of 10% to form a mixed solution, stirring the mixed solution at the speed of 600r/min for 12 hours in a water bath environment with the temperature of 80 ℃, and defoaming for 12 hours in an environment with the vacuum degree of 0.1MPa to obtain a modified solution. Immersing the rush fibers in a washing solution, carrying out ultrasonic treatment for 20min at 60kHz and 35 ℃, and then placing the rush fibers in a 50 ℃ drying oven for drying for 5.5h to obtain the pretreated rush fibers. Placing the pretreated rush fibers in a Buchner funnel, performing suction filtration for 4min under the negative pressure of 0.4MPa under the infiltration of a modification solution, then placing the rush fibers in a refrigerator at the temperature of minus 30 ℃ for pre-freezing for 12h, taking out the rush fibers, and then placing the rush fibers in a freeze dryer at the vacuum degree of 0.2MPa and the temperature of minus 52 ℃ for vacuum freeze-drying for 12h to obtain the modified rush. Taking 20 modified strip-shaped rush fibers with the length of 3cm, closely and directionally arranging the rush fibers, pressing the rush fibers by a filter rod forming machine, and then coating the rush fibers by filter tip forming paper to obtain the fiber-based cigarette filter tip.
Claims (2)
1. A preparation method of a fiber-based cigarette filter is characterized by comprising the following steps: the preparation method comprises the following steps:
preparation of washing solution
Uniformly mixing isopropanol and water, and stirring to prepare a washing liquid, wherein the volume ratio of the isopropanol to the water is 98: 2-90: 10, the stirring speed is 50-600 r/min, and the stirring time is 1-10 min;
b preparation of modified solution
Placing polyvinylpyrrolidone into a mixed solution of ethanol and water, stirring and dissolving, and then performing defoaming treatment in a vacuum environment to obtain a modified solution, wherein the mass fraction of the polyvinylpyrrolidone is 3-10%, the volume ratio of the ethanol to the water is 95: 5-90: 10, the dissolving temperature is 40-80 ℃, the stirring speed is 50-600 r/min, the stirring time is 6-12 h, the vacuum degree of the vacuum environment is 0.05-0.1 MPa, and the defoaming treatment time is 8-12 h;
c pretreatment of rush
B, placing rush into the washing liquid prepared in the step a, performing ultrasonic treatment, and drying to obtain pretreated rush, wherein the ultrasonic frequency is 20-60 kHz, the ultrasonic temperature is 10-35 ℃, the ultrasonic time is 15-20 min, the drying temperature is 40-60 ℃, and the drying time is 4-8 h;
modification of rush
Placing the rush subjected to pretreatment in the step c in a Buchner funnel, soaking the rush in the modified solution prepared in the step b for negative pressure suction filtration, then placing the rush in a refrigerator for prefreezing, transferring the prefreezed rush into a freeze dryer after prefreezing is finished, and performing vacuum freeze drying to obtain the modified rush, wherein the suction filtration negative pressure is 0.3-0.5 MPa, the suction filtration time is 3-5 min, the prefreezing temperature is-40 to-30 ℃, the prefreezing time is 6-12 h, the vacuum degree of vacuum freeze drying is 0.1MPa, the vacuum freeze drying temperature is-55 to-40 ℃, and the vacuum freeze drying time is 6-12 h;
preparation of e-fiber based cigarette filters
And d, cutting the corduroy modified in the step d into strips, wherein the length of each strip is 2-3 cm, tightly arranging the strips into cylinders along the axial direction, pressing the cylinders by a filter rod forming machine, and coating the cylinders by filter tip forming paper to obtain the fiber-based cigarette filter tip, wherein the fiber-based cigarette filter tip contains 20-30 modified strips of corduroy.
2. The method of making a fiber-based cigarette filter according to claim 1, wherein: the average molecular weight of the polyvinylpyrrolidone is 80000-130000.
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