Non-woven fabric for preparing cigarette filter, preparation method thereof, and cigarette filter

Abstract

The present invention provides a non-woven fabric for making cigarette filters. The raw materials include cellulose acetate, polylactic acid fiber, and carbon fiber. The polylactic acid fiber is obtained by melt-blending a polylactic acid copolymer, modified nano-POSS, and cellulose diacetate, extruding to produce a masterbatch, and then melt-spinning. The high-strength non-woven fabric for making cigarette filters has a uniform appearance and consistent thickness, and exhibits excellent tensile properties, air permeability, filtration efficiency, filtration resistance, and smoke cooling effects.

Description

Technical Field

[0001] The present invention relates to the technical field of materials, in particular to a non-woven fabric for preparing a cigarette filter, a preparation method thereof, and a cigarette filter. Background Art

[0002] Smoking is a complex psychological and social behavior. It is particularly harmful to the respiratory tract, easily causing illnesses such as laryngitis, tracheitis, and emphysema. Smoke enters the mouth, passes through the throat, trachea, and bronchi, and enters the bloodstream. With growing concern about the health effects of smoking, toxic and carcinogenic compounds need to be separated and removed through adsorption. Research on tar reduction and harm reduction technologies for cigarette products has attracted significant attention within the tobacco industry.

[0003] Heat-not-burn (HTB) cigarettes offer advantages over conventional combustion cigarettes, such as reduced harm and toxicity. However, their unique structural characteristics also present new challenges. Currently available HNB cigarettes, when smoked, experience a noticeable burning and acrid sensation due to the dual cooling effects of the unburned cigarette and the smoke-filtering filter. This often manifests as discomfort in the mouth, throat, lungs, and respiratory tract, impacting the smoking experience and, to a certain extent, limiting their market adoption.

[0004] Therefore, there is an urgent need to develop a non-woven material that can be used in cigarette filters and can effectively reduce the temperature of smoke. Summary of the Invention

[0005] In view of this, the present invention provides a non-woven fabric for preparing cigarette filters, which has a certain cooling effect on the smoke transmission of non-burning cigarettes while meeting the strength requirements of rolled cigarette holders.

[0006] The invention provides a non-woven fabric for preparing cigarette filters. The raw materials include acetate fiber, polylactic acid fiber and carbon fiber. The polylactic acid fiber is obtained by melt spinning by melt blending and extruding polylactic acid copolymer, modified nano POSS and diacetyl cellulose to prepare master batch.

[0007] Preferably, the non-woven fabric raw material comprises 5 to 100 parts of acetate fiber, 1 to 100 parts of polylactic acid fiber and 1 to 30 parts of carbon fiber;

[0008] The fineness of the acetate fiber is 1 to 10 deniers; the fineness of the polylactic acid fiber is 1 to 3 deniers; and the diameter of the carbon fiber is 1 to 10 μm.

[0009] Preferably, the preparation method of the polylactic acid fiber includes:

[0010] A polylactic acid copolymer, modified nano-POSS, and cellulose diacetate are melt-blended and extruded to obtain a polylactic acid masterbatch; the polylactic acid masterbatch is melt-spun to obtain polylactic acid fibers; the spinning temperature is 210° C.; the winding speed is 2000 r / min, the drawing temperature is 85° C., and the drawing ratio is 3 times.

[0011] Preferably, the polylactic acid copolymer in the polylactic acid fiber is selected from one or more of poly L-lactic acid (PLLA), poly D-lactic acid (PDLA), poly D, L-lactide (PDLLA), polylactic acid-glycolic acid (PLGA), polylactic acid-caprolactone (PLA-PCL), and polylactic acid-trimethylene carbonate-glycolide (PLTG).

[0012] Preferably, the preparation method of the modified nano POSS comprises:

[0013] a) heating L-lactic acid under vacuum and dehydrating to obtain lactic acid oligomers;

[0014] b) dispersing nano POSS into a solvent, mixing with a lactic acid oligomer, reacting in vacuo, and washing and drying the reaction product;

[0015] The nano POSS is selected from one or more of octaphenyloctasilsesquioxane (O-POSS), dodecaphenylsilsesquioxane (DP-POSS), tetrasilanolphenylsilsesquioxane (Ph-POSS), aminopropylisobutylsilsesquioxane (A-POSS), octaaminophenylsilsesquioxane (OA-POSS), trisulfonic acid propylsilsesquioxane (TS-POSS) or octaaminopropylsilsesquioxane (OAS-POSS).

[0016] Preferably, the volume-to-weight ratio of the L-lactic acid to the nano-POSS is 1 ml: (10-30) g;

[0017] The vacuum degree of the vacuum heating is 0.05-0.1 MPa, the heating temperature is 80-110°C for pre-dehydration, and the temperature is raised to 120-150°C for further dehydration;

[0018] The vacuum reaction comprises: removing the solvent under the conditions of a temperature of 60-90° C. and a vacuum degree of 0.05-0.1 MPa, and heating the temperature to 120-160° C. for reaction.

[0019] Preferably, the carbon fiber is a carbon fiber coated with polyacrylic acid;

[0020] The method for preparing the carbon fiber coated with polyacrylic acid comprises: spraying a polyacrylic acid solution on the carbon fiber by spraying to obtain the carbon fiber coated with polyacrylic acid.

[0021] The present invention provides a method for preparing a non-woven fabric for a cigarette filter, comprising the following steps:

[0022] A) opening and mixing acetate fiber, polylactic acid fiber and carbon fiber, and pre-combing;

[0023] B) The web is laid by cross-lapping, pre-needled in a needle loom, fixed by two front and back hydroentanglement passes, and then hot-rolled for finishing.

[0024] Preferably, the pre-combing parameters include: the speed of the cotton feeding roller is 0.4-0.5 r / min; the speed of the licker-in roller is 550-600 r / min; the speed of the cylinder is 550-580 r / min; the speed of the doffer is 7.5-8 r / min; the web outlet speed is 4-5 r / min;

[0025] The parameters of the spunlace include: the water pressure of the first spunlace is controlled at 5MPa, the water pressure of the second spunlace is 6.5MPa, and the production speed is 8m / min;

[0026] The hot rolling temperature is 150-180°C.

[0027] The present invention provides a cigarette filter, the raw material of which is the non-woven fabric described in any one of the above technical solutions.

[0028] Compared to existing technologies, the present invention provides a nonwoven fabric for making cigarette filters. The raw materials include cellulose acetate, polylactic acid fiber, and carbon fiber. The polylactic acid fiber is obtained by melt-blending a polylactic acid copolymer, modified nano-POSS, and cellulose diacetate, extruding to produce a masterbatch, and then melt-spinning. The high-strength nonwoven fabric for making cigarette filters has a uniform appearance and consistent thickness, and exhibits excellent tensile properties, air permeability, filtration efficiency, filtration resistance, and smoke cooling effects. DETAILED DESCRIPTION

[0029] The present invention provides a non-woven fabric for preparing a cigarette filter, a method for preparing the same, and a cigarette filter. Those skilled in the art can refer to the contents of this document and appropriately improve the process parameters to achieve the desired results. It should be noted that all similar substitutions and modifications are obvious to those skilled in the art and fall within the scope of protection of the present invention. The methods and applications of the present invention have been described through preferred embodiments, and relevant personnel can obviously modify or appropriately alter and combine the methods and applications herein without departing from the content, spirit, and scope of the present invention to implement and apply the technology of the present invention.

[0030] In this application, the term "and / or" describes the association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural.

[0031] In this application, "at least one" means one or more, and "more than one" means two or more. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items.

[0032] The invention provides a non-woven fabric for preparing cigarette filters. The raw materials include acetate fiber, polylactic acid fiber and carbon fiber. The polylactic acid fiber is obtained by melt spinning by melt blending and extruding polylactic acid copolymer, modified nano POSS and diacetyl cellulose to prepare master batch.

[0033] The non-woven fabric for the cigarette filter provided by the present invention comprises 5 to 100 parts of cellulose acetate fiber, 1 to 100 parts of polylactic acid fiber and 1 to 30 parts of carbon fiber as raw materials;

[0034] In a preferred embodiment, calculated by weight, it contains 5-60 parts of cellulose acetate fiber, 10-50 parts of polylactic acid fiber and 3-15 parts of carbon fiber; preferably, it contains 40 parts of cellulose acetate fiber, 40 parts of polylactic acid fiber and 12 parts of carbon fiber.

[0035] In a preferred embodiment, the fineness of the acetate fiber is 1 to 10 deniers; the fineness of the polylactic acid fiber is 1 to 3 deniers; and the diameter of the carbon fiber is 1 to 10 μm.

[0036] In a preferred embodiment, the cross section of the acetate fiber is Y-shaped; the cross section of the polylactic acid fiber is circular; and the cross section of the carbon fiber is circular.

[0037] The non-woven fabric for preparing cigarette filters provided by the present invention comprises polylactic acid fibers. The polylactic acid fibers of the present invention are obtained by melt spinning by melt blending and extruding polylactic acid copolymer, modified nano POSS and diacetyl cellulose to prepare master batches.

[0038] Specifically, the preparation method of the polylactic acid fiber includes:

[0039] The polylactic acid copolymer, modified nano-POSS and cellulose diacetate are mixed and melt-blended, and then extruded to obtain polylactic acid masterbatch; and the polylactic acid masterbatch is melt-spun to obtain polylactic acid fiber.

[0040] In a preferred embodiment, the mass ratio of polylactic acid copolymer, modified nano POSS, and cellulose diacetate is (50-105): (1-10): (1-20);

[0041] In a preferred embodiment, the mass ratio of polylactic acid copolymer, modified nano POSS, and cellulose diacetate is (62-80): (2-7): (5-10);

[0042] In a preferred embodiment, the mass ratio of polylactic acid copolymer, modified nano POSS, and cellulose diacetate is 70:5:8;

[0043] In a preferred embodiment, the polylactic acid fiber is obtained by melt spinning by melt blending and extruding poly (L-lactic acid) (PLLA), poly (D-lactic acid) (PDLA), modified nano POSS, and cellulose diacetate to prepare a masterbatch.

[0044] In a preferred embodiment, the polylactic acid fiber is obtained by melt spinning by melt blending and extruding 10 to 30 parts of poly (L-lactic acid) (PLLA), 40 to 75 parts of poly (D-lactic acid) (PDLA), 1 to 10 parts of modified nano-POSS, and 1 to 20 parts of cellulose diacetate to prepare a masterbatch.

[0045] Preferably, the polylactic acid fiber is obtained by melt spinning by melt blending and extruding 12 to 20 parts of poly (L-lactic acid) (PLLA), 50 to 60 parts of poly (D-lactic acid) (PDLA), 2 to 7 parts of modified nano-POSS, and 5 to 10 parts of cellulose diacetate to obtain a masterbatch;

[0046] More preferably, calculated by weight, the polylactic acid fiber is obtained by melt spinning by melt blending and extruding 16 parts of poly (L-lactic acid) (PLLA), 54 parts of poly (D-lactic acid) (PDLA), 5 parts of modified nano-POSS, and 8 parts of cellulose diacetate to prepare a masterbatch.

[0047] In a preferred embodiment, the preparation method of the polylactic acid fiber is as follows:

[0048] (1) By weight, 16 parts of poly (L-lactic acid) (PLLA), 30 parts of poly (D-lactic acid) (PDLA), 5 parts of modified nano-POSS, and 8 parts of cellulose diacetate were uniformly mixed, melt-blended and extruded through a twin-screw extruder to obtain a polylactic acid masterbatch, and vacuum-dried;

[0049] (2) The polylactic acid masterbatch in step (1) and 20 parts of poly (dextral lactic acid) (PDLA) slices are put into a high-speed mixer and mixed evenly. The mixture is spun through a circular spinneret on a melt spinning machine to obtain polylactic acid fibers.

[0050] The spinning temperature is 200-220° C., the winding speed is 1800-2100 m / min; the drawing temperature is 75-90° C., and the drawing ratio is 3-4 times.

[0051] In one embodiment, the spinning temperature is 210° C., the winding speed is 2000 m / min; the drawing temperature is 85° C., and the drawing ratio is 3 times.

[0052] The polylactic acid copolymer in the polylactic acid fiber of the present invention is selected from one or more of poly (L-lactic acid) (PLLA), poly (D-lactic acid) (PDLA), poly (D,L-lactide) (PDLLA), poly (lactic acid-glycolic acid) (PLGA), poly (lactic acid-caprolactone) (PLA-PCL), and poly (lactic acid-trimethylene carbonate-glycolide) (PLTG).

[0053] The modified nano POSS described in the present invention is a polylactic acid copolymer modified nano POSS.

[0054] The preparation method of modified nano POSS of the present invention comprises:

[0055] a) vacuum heating and dehydration of L-lactic acid to obtain lactic acid oligomers; the vacuum degree of the vacuum heating is 0.05-0.1 MPa, the heating temperature is 80-110° C. for pre-dehydration, and the temperature is raised to 120-150° C. for further dehydration.

[0056] b) dispersing nano-POSS in a solvent, mixing with lactic acid oligomers, and reacting in vacuum, washing and drying the reaction product. The vacuum reaction comprises removing the solvent at a temperature of 60-90° C. and a vacuum degree of 0.05-0.1 MPa, and heating to 120-160° C. for reaction.

[0057] According to the present invention, L-lactic acid is added to a reactor, the vacuum degree is adjusted to 0.05-0.1 MPa, the reactor is heated to 80-110° C. for pre-dehydration, and the temperature is raised to 120-150° C. for further dehydration to obtain lactic acid oligomers.

[0058] In a preferred embodiment, the volume-weight ratio of the L-lactic acid to the nano-POSS is 1 ml: (10-30) g; preferably, the volume-weight ratio of the L-lactic acid to the nano-POSS is 1 ml: (15-25) g; more preferably, the volume-weight ratio of the L-lactic acid to the nano-POSS is 1 ml: 18 g.

[0059] The nano POSS is selected from one or more of octaphenyl octasilsesquioxane (O-POSS), dodecaphenyl silsesquioxane (DP-POSS), tetrasilanolphenyl silsesquioxane (Ph-POSS), aminopropyl isobutyl silsesquioxane (A-POSS), octaaminophenyl silsesquioxane (OA-POSS), trisulfonic acid propyl silsesquioxane (TS-POSS) or octaaminopropyl silsesquioxane (OAS-POSS); more preferably, the nano POSS is octaaminophenyl silsesquioxane (OA-POSS, purchased from Shanghai Hanhong Technology Co., Ltd.).

[0060] The carbon fiber described in the present invention is carbon fiber coated with polyacrylic acid.

[0061] The method for preparing the carbon fiber coated with polyacrylic acid comprises: spraying a polyacrylic acid solution on the carbon fiber by spraying to obtain the carbon fiber coated with polyacrylic acid.

[0062] The preparation method of the polyacrylic acid solution of the present invention comprises the following steps: stirring and dissolving polyacrylic acid and ethanol to obtain the polyacrylic acid solution.

[0063] In a preferred embodiment, the weight-to-volume ratio of the polyacrylic acid to the ethanol in step (1) is 1 g:(10-30) ml; preferably, the weight-to-volume ratio of the polyacrylic acid to the ethanol is 1 g:25 ml.

[0064] In a preferred embodiment, the weight ratio of the polyacrylic acid solution to the carbon fiber is (0.005-0.0015):1; preferably, the weight ratio of the polyacrylic acid solution to the carbon fiber is 0.012:1.

[0065] The present invention does not limit the spraying method, and it can be any method known to those skilled in the art.

[0066] The present invention provides a method for preparing a non-woven fabric for a cigarette filter, comprising the following steps:

[0067] A) opening and mixing acetate fiber, polylactic acid fiber and carbon fiber, and pre-combing;

[0068] B) The web is laid by cross-lapping, pre-needled in a needle loom, fixed by two front and back hydroentanglement passes, and then hot-rolled for finishing.

[0069] The preparation method of the non-woven fabric for cigarette filters provided by the present invention first opens and mixes acetate fiber, polylactic acid fiber and carbon fiber, and then pre-combs them on a cotton-type carding machine; in a preferred embodiment, the basic parameters of the carding are set as follows: the speed of the cotton feeding roller is 0.4-0.5 r / min; the speed of the licker-in roller is 550-600 r / min; the speed of the cylinder is 550-580 r / min; the speed of the doffer is 7.5-8 r / min; and the web outlet speed is 4-5 r / min; then the fiber web is combed again before being fixed on a GSA-500 carding machine, and the basic parameters are set as follows: feeding 2-3 Hz, doffer 10-15 Hz, and cylinder 15-25 Hz.

[0070] The web is laid in a cross-lapping manner, fed into a needle loom for pre-needling, and fixed using two front and back hydroentanglement passes. The parameters of the hydroentanglement include: the water pressure of the first pass is controlled at 5MPa, the water pressure of the second pass is 6.5MPa, and the production speed is 8m / min.

[0071] The spunlace mixed nonwoven fabric is dried and hot-rolled on both sides to obtain the high-strength nonwoven fabric for making cigarette filters. The hot rolling temperature is 150-180°C, preferably 155-170°C.

[0072] In a preferred embodiment, the basic carding parameters are set as follows: the speed of the cotton feeding roller is 0.45 r / min; the speed of the licker-in roller is 590 r / min; the speed of the cylinder is 570 r / min; the speed of the doffer is 7.5 r / min; and the web outlet speed is 4.3 r / min; then the fiber web is combed again before being fixed by the GSA-500 carding machine, and the basic parameters are set as follows: feed 2.1 Hz, doffer 14 Hz, and cylinder 20 Hz. The web is cross-laid and enters the needle loom for pre-needling, and then passes through the hydroentanglement system. During the hydroentanglement, the water pressure of the first hydroentanglement is controlled at 5 MPa, the water pressure of the second hydroentanglement is 6.5 MPa, and the production speed is 8 m / min; the hydroentangled mixed non-woven fabric is dried and then hot-rolled at a temperature of 170°C.

[0073] The present invention provides a cigarette filter, the raw material of which is the non-woven fabric described in any one of the above technical solutions.

[0074] The present invention also provides a cigarette comprising the cigarette filter described in the above technical solution.

[0075] The present invention also provides the use of the high-strength non-woven fabric for preparing cigarette filters in preparing cigarette or non-burning cigarette filters.

[0076] Compared with the prior art, the present invention has the following beneficial effects:

[0077] (1) The high-strength non-woven fabric used to prepare cigarette filters of the present invention has good appearance uniformity and consistent thickness, and has excellent tensile properties, air permeability, filtration efficiency, filtration resistance, and smoke cooling effect.

[0078] (2) POSS is an inorganic core composed of a silicon-oxygen skeleton alternately connected by Si-O, and is a polyhedral oligomeric silsesquioxane with regular structural units. The present invention modifies nano-POSS by polylactic acid copolymer and then adds it to polylactic acid fiber, which not only greatly improves the mechanical strength but also solves the compatibility of nano-POSS particles.

[0079] (3) The polylactic acid fiber of the present invention is low in cost and can be completely biodegraded, which is environmentally friendly; the spinning performance is good, the quality of the yarn bundle is stable, and the polylactic acid fiber has excellent flexibility and good mechanical strength.

[0080] (4) Acetate fiber and polylactic acid fiber are green and environmentally friendly fibers, which are biodegradable. The non-woven fabrics made by the carding, needling, hydroentanglement and hot rolling processing methods have a three-dimensional filtering space and have a certain filtering efficiency for smoke. At the same time, the polylactic acid fiber and carbon fiber provided by the present invention are mixed with acetate fiber, which greatly improves the tensile strength of the non-woven fabric without affecting the three-dimensional requirements inside the material.

[0081] (5) Polylactic acid fiber has a certain phase change in the smoke temperature range of non-combustible cigarettes, and carbon fiber has strong heat conduction and heat absorption capabilities. Adding polylactic acid fiber and carbon fiber to acetate fiber has a certain cooling effect on the smoke transmission of non-combustible cigarettes, does not affect the smoking experience, and is conducive to market promotion.

[0082] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. Some or all of the steps can be executed in parallel or sequentially. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0083] The numerical ranges and parameters used in this disclosure are presented as precisely as possible to represent the relevant numerical values ​​of the specific embodiments. However, any numerical value inherently and inevitably contains standard deviations resulting from individual testing methods. Therefore, unless otherwise expressly stated, it should be understood that all numerical ranges or specific data used in this disclosure are subject to reasonable deviation within a certain range, for example, within 1% or 0.5%.

[0084] Some cases are described in the embodiments and comparative examples of the present invention, wherein the embodiments illustrate certain implementations of the present invention. However, this does not mean that the effects of the present invention can only be achieved in these cases.

[0085] The chemical reactions of the present invention are carried out in suitable solvents that are compatible with the chemical transformations of the present invention and the reagents and materials required. To obtain the compounds of the present invention, it may sometimes be necessary for those skilled in the art to modify or select synthetic steps or reaction schemes based on existing embodiments.

[0086] All solvents used in the present invention are commercially available and can be used without further purification. The reaction is generally carried out in anhydrous solvent under inert nitrogen.

[0087] To further illustrate the present invention, a non-woven fabric for preparing a cigarette filter, a preparation method thereof, and a cigarette filter provided by the present invention are described in detail below with reference to examples.

[0088] Example 1

[0089] The high-strength non-woven fabric raw material used to prepare the cigarette filter in this embodiment includes 40 parts of cellulose acetate fiber, 40 parts of polylactic acid fiber and 12 parts of carbon fiber; the polylactic acid fiber is obtained by melt spinning by melt blending and extruding polylactic acid copolymer, modified nano POSS and diacetate cellulose to prepare masterbatch.

[0090] The fineness of the acetate fiber is 3 deniers; the fineness of the polylactic acid fiber is 2 deniers; and the diameter of the carbon fiber is 7 μm.

[0091] The cross section of the acetate fiber is Y-shaped; the cross section of the polylactic acid fiber is circular; and the cross section of the carbon fiber is circular.

[0092] The processing method for preparing the high-strength non-woven fabric for cigarette filters comprises the following steps:

[0093] (1) opening and mixing acetate fiber, polylactic acid fiber and carbon fiber according to parts by weight, and then pre-combing them on a cotton carding machine;

[0094] (2) Using cross-laying method to lay the net;

[0095] (3) Enter the needle loom for pre-needling, and use two-pass front and back water spunlace to fix the net;

[0096] (4) The high-strength non-woven fabric for preparing cigarette filters is obtained by performing two hot rolling processes on the front and back sides.

[0097] The basic carding parameters are set as follows: the speed of the cotton feed roller is 0.45 r / min; the speed of the licker-in roller is 590 r / min; the speed of the cylinder is 570 r / min; the speed of the doffer is 7.5 r / min; and the web outlet speed is 4.3 r / min. The fiber web is then combed again before being fixed by a GSA-500 carding machine. The basic parameters are set as follows: feed 2.1 Hz, doffer 14 Hz, and cylinder 20 Hz. A cross-lapping method is used, and the web enters the needling machine for pre-needling. Then, it passes through the hydroentanglement system. The water pressure of the first hydroentanglement is controlled at 5 MPa, and the water pressure of the second hydroentanglement is 6.5 MPa. The production speed is 8 m / min. The hydroentangled mixed non-woven fabric is dried and then hot-rolled at a temperature of 170°C to obtain the high-strength non-woven fabric for preparing cigarette filters.

[0098] The weight of the nonwoven fabric prepared in this embodiment is 145 g / m 2 , thickness is 0.45mm.

[0099] The preparation method of the polylactic acid fiber is as follows:

[0100] (1) By weight, 16 parts of poly (L-lactic acid) (PLLA), 30 parts of poly (D-lactic acid) (PDLA), 5 parts of modified nano-POSS, and 8 parts of cellulose diacetate were uniformly mixed, melt-blended and extruded through a twin-screw extruder to obtain a polylactic acid masterbatch, and vacuum-dried;

[0101] (2) The polylactic acid masterbatch in step (1) and 20 parts of poly (dextral lactic acid) (PDLA) slices are put into a high-speed mixer and mixed evenly. The mixture is spun through a circular spinneret on a melt spinning machine to obtain polylactic acid fibers. The spinning temperature is 210° C. and the winding speed is 2000 m / min. The drawing temperature is 85° C. and the drawing ratio is 3 times.

[0102] The preparation method of the polylactic acid copolymer modified nano POSS is as follows:

[0103] (1) L-lactic acid was added to the reactor, the vacuum degree was adjusted to 0.08 MPa, and the reactor was heated to 100°C for pre-dehydration for 1 hour, and then the temperature was raised to 130°C for further dehydration for 2 hours to obtain lactic acid oligomers.

[0104] (2) Dispersing nano-octaaminophenylsilsesquioxane in dioxane, adding the lactic acid oligomer in step (1), then removing the solvent at a temperature of 80° C. and a vacuum degree of 0.1 MPa, heating to 140° C. and reacting for 2 h. After the reaction is completed, washing the product with dichloromethane and vacuum drying to obtain lactic acid oligomer-modified nano-POSS, wherein the volume-to-weight ratio of the L-lactic acid to the octaaminophenylsilsesquioxane is 1 ml:18 g.

[0105] The carbon fiber is prepared by coating polyacrylic acid on the surface of the carbon fiber as follows:

[0106] (1) adding polyacrylic acid and ethanol to a reactor, stirring and dissolving, and obtaining a polyacrylic acid solution; wherein the weight volume ratio of the polyacrylic acid to the ethanol is 1 g:25 ml;

[0107] (2) Spraying the polyacrylic acid solution onto the carbon fiber and drying it to obtain the carbon fiber surface coated with polyacrylic acid, wherein the weight ratio of the polyacrylic acid solution to the carbon fiber is 0.012:1.

[0108] Example 2

[0109] The only difference from Example 1 is that the high-strength non-woven fabric used to prepare the cigarette filter contains 50 parts of cellulose acetate fiber, 30 parts of polylactic acid fiber and 12 parts of carbon fiber.

[0110] Example 3

[0111] The only difference from Example 1 is that the high-strength non-woven fabric used to prepare the cigarette filter contains 30 parts of cellulose acetate fiber, 50 parts of polylactic acid fiber and 12 parts of carbon fiber.

[0112] Comparative Example 1

[0113] The only difference from Example 1 is that the polylactic acid fiber in the high-strength non-woven fabric for preparing cigarette filters is obtained by melt spinning by melt blending and extruding polylactic acid copolymer, nano octaaminophenylsilsesquioxane, and cellulose diacetate to prepare a masterbatch.

[0114] Comparative Example 2

[0115] The only difference from Example 1 is that the polylactic acid fibers in the high-strength non-woven fabric for preparing cigarette filters are obtained by melt spinning after polylactic acid copolymers are melt blended and extruded to prepare master batches.

[0116] Comparative Example 3

[0117] The only difference from Example 1 is that the carbon fibers in the high-strength non-woven fabric used to prepare cigarette filters are not coated with polyacrylic acid on the surface of the carbon fibers.

[0118] Comparative Example 4

[0119] The only difference from Example 1 is that the polylactic acid fiber in the high-strength non-woven fabric used to prepare cigarette filters is obtained by melt spinning after melt blending and extrusion of polylactic acid copolymer to obtain masterbatch; the carbon fiber is not coated with polyacrylic acid on the surface of the carbon fiber.

[0120] Comparative Example 5

[0121] The only difference from Example 1 is that the high-strength non-woven fabric used to prepare the cigarette filter contains only 50 parts of cellulose acetate fiber and 52 parts of polylactic acid fiber, and no carbon fiber.

[0122] Performance Testing

[0123] 1. Physical properties were measured according to Y / CT 152-2001.

[0124] 2. The tensile properties test was carried out according to GB / T 14337-2008 “Test method for tensile properties of chemical staple fibers”.

[0125] 3. The filter tip was tested for its cooling effect on non-combustion cigarette smoke (filter tip length: 25 mm, circumference: 22 mm). Simulated smoking was performed using the Canadian High Intensity (HCI) smoking pattern, as specified in the national standard GB / T19609-2004, with the following puff parameters: puff volume: 55 mL / L, puff frequency: 30 seconds, and puff duration: 2 seconds.

[0126] Table 1

[0127] sample Filtration efficiency (%) Longitudinal strength (N) Transverse strength (N) Example 1 48.5 71 68 Example 2 45.1 67 65 Example 3 43.6 68 65 Comparative Example 1 43.0 60 54 Comparative Example 2 40.2 56 43 Comparative Example 3 43.1 64 59 Comparative Example 4 40.0 49 40 Comparative Example 5 39.3 47 32

[0128] From the data in Table 1, it can be seen that the nonwoven fabric for filter material of non-combustion cigarette has excellent tensile properties and filtration efficiency. There is a significant difference between the effects of the embodiment and the comparative example.

[0129] Table 2 Cooling effect of non-burning cigarette smoke

[0130]

[0131]

[0132] From the above data, it can be seen that the non-woven fabric of the present invention has good air permeability and its tensile strength can meet the tensile requirements of subsequent processing. At the same time, its use as a non-combustion cigarette filter material has a good cooling effect on non-combustion cigarettes, meeting the requirements of cigarette materials.

[0133] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A non-woven fabric for preparing a cigarette filter, characterized in that: The raw materials include acetate fiber, polylactic acid fiber and carbon fiber; the polylactic acid fiber is obtained by melt spinning by melt blending polylactic acid copolymer, modified nano POSS and diacetyl cellulose to prepare masterbatch; The preparation method of the modified nano POSS comprises: a) heating L-lactic acid in vacuum and dehydrating it to obtain lactic acid oligomers; b) dispersing the nano-POSS in a solvent, mixing with the lactic acid oligomer, reacting in vacuum, and washing and drying the reaction product; The volume-to-weight ratio of the L-lactic acid to the nano-POSS is 1 ml: (10-30) g; The vacuum degree of the vacuum heating is 0.05-0.1 MPa, the heating temperature is 80-110°C for pre-dehydration, and the temperature is raised to 120-150°C for further dehydration; The vacuum reaction comprises: removing the solvent under the conditions of a temperature of 60-90° C. and a vacuum degree of 0.05-0.1 MPa, and heating the temperature to 120-160° C. for reaction; The carbon fiber is a carbon fiber coated with polyacrylic acid; The method for preparing the carbon fiber coated with polyacrylic acid comprises: spraying a polyacrylic acid solution on the carbon fiber by spraying to obtain the carbon fiber coated with polyacrylic acid.

2. The nonwoven fabric according to claim 1, characterized in that The non-woven fabric raw material includes 5 to 100 parts of acetate fiber, 1 to 100 parts of polylactic acid fiber and 1 to 30 parts of carbon fiber; The fineness of the acetate fiber is 1 to 10 deniers; the fineness of the polylactic acid fiber is 1 to 3 deniers; and the diameter of the carbon fiber is 1 to 10 μm.

3. The nonwoven fabric according to claim 1, wherein The preparation method of the polylactic acid fiber comprises: A polylactic acid copolymer, modified nano-POSS, and cellulose diacetate are melt-blended and extruded to obtain a polylactic acid masterbatch; the polylactic acid masterbatch is melt-spun to obtain polylactic acid fibers; the spinning temperature is 210° C.; the winding speed is 2000 r / min, the drawing temperature is 85° C., and the drawing ratio is 3 times.

4. The nonwoven fabric according to claim 3, characterized in that The polylactic acid copolymer in the polylactic acid fiber is selected from one or more of poly (L-lactic acid) (PLLA), poly (D-lactic acid) (PDLA), poly (D,L-lactide) (PDLLA), poly (lactic acid-glycolic acid) (PLGA), poly (lactic acid-caprolactone) (PLA-PCL), and poly (lactic acid-trimethylene carbonate-glycolide) (PLTG).

5. The nonwoven fabric according to claim 3, characterized in that The nano POSS is selected from one or more of octaphenyloctasilsesquioxane (O-POSS), dodecaphenylsilsesquioxane (DP-POSS), tetrasilanolphenylsilsesquioxane (Ph-POSS), aminopropylisobutylsilsesquioxane (A-POSS), octaaminophenylsilsesquioxane (OA-POSS), trisulfonic acid propylsilsesquioxane (TS-POSS) or octaaminopropylsilsesquioxane (OAS-POSS).

6. A method for preparing a nonwoven fabric for a cigarette filter according to any one of claims 1 to 5, characterized in that: The steps include: A) opening and mixing acetate fiber, polylactic acid fiber and carbon fiber, and pre-carding; B) The web is laid by cross-lapping, pre-needled in a needle loom, fixed by two front and back hydroentanglement passes, and then hot-rolled for finishing.

7. The preparation method according to claim 6, characterized in that The pre-carding parameters include: the speed of the cotton feeding roller is 0.4~0.5 r / min; the speed of the licker-in roller is 550~600 r / min; the speed of the cylinder is 550~580 r / min; the speed of the doffer is 7.5~8 r / min; the web outlet speed is 4~5 r / min; The parameters of the spunlace include: the water pressure of the first spunlace is controlled at 5MPa, the water pressure of the second spunlace is 6.5MPa, and the production speed is 8m / min; The hot rolling temperature is 150-180°C.

8. A cigarette filter, characterized in that: The raw material comprises the nonwoven fabric according to any one of claims 1 to 5.

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