CN102423141A - Preparation method of cigarette filter tip adopting electrostatic spinning acetate fiber membrane - Google Patents

Abstract

The present invention relates to a preparation method of a cigarette filter using an electrostatically spun cellulose acetate membrane, comprising: (1) dissolving cellulose diacetate in a mixed solution of acetone and dimethylacetamide, and performing electrostatic spinning to obtain a nano-cellulose acetate membrane; (2) pulling out the cellulose acetate bundle in the cigarette, laying the nano-cellulose acetate membrane between the filter and the cigarette along the cross-sectional direction of the filter, and then putting the previously pulled out cellulose acetate bundle into the cigarette, cutting off the filter portion that exceeds the tipping paper, and making an improved cigarette filter. The present invention uses electrostatic spinning technology to manufacture the nano-cellulose acetate membrane, and adding it to the cigarette filter can not only perfectly combine with the cigarette filter, but also enhance the filtering performance of the cigarette filter for harmful gases. At the same time, the operation is simple, the efficiency is relatively high, and the content of various harmful components is significantly reduced, and there is a good market prospect.

Description

A kind of preparation method of the cigarette filter tip adopting electrospinning cellulose acetate film

technical field

The invention belongs to the field of application of cellulose acetate membranes, in particular to a method for preparing a cigarette filter tip using electrospun cellulose acetate membranes.

Background technique

Electrospinning technology has a history of nearly 80 years. It was first filed in 1934 when Formhals applied for a patent for an electrospinning device for preparing polymer ultrafine fibers. Electrospinning is to charge the polymer solution or melt with high-voltage static electricity, and the charged polymer droplets form a Taylor cone at the apex of the capillary under the force of the electric field. When the electric field force is strong enough, the polymer droplets can overcome the surface tension to form a fine spray stream. The solvent evaporates during the spray process of the fine stream, and the product finally falls on the receiving device to form a fiber mat similar to a non-woven fabric. The fiber fineness obtained by electrospinning technology is in the nanometer range, and the collected fiber membrane has a felt-like structure, and the spun nanofiber membrane has various properties. Due to the extremely small fiber fineness, large specific surface area, etc., and the high porosity of the fiber membrane, it can be used in filter materials, biomedical engineering materials, composite materials and other fields. With the development in recent years, the application of nanofibrous membranes has attracted the attention of more and more researchers.

The tobacco industry rose 1,500 years ago. To some extent, it meets the needs of human social interaction, psychology and physiology. The number of smoking population and the trend of younger smoking groups continue to increase. Smoking occupies an important role in people's daily life. important position. Therefore, it has become a very important project to protect the health of smokers and consumers by reducing harmful components such as tar and nicotine in tobacco.

The content of harmful substances in cigarette smoke is an important indicator to measure the quality of cigarettes and their impact on human health. Harmful substances in cigarettes are produced in the process of dry distillation and thermal cracking when cigarettes are burned. Combustion conditions are related to many factors such as burning time, amount of burning material, filtering conditions, and flue gas dilution ratio. For details, see Dai Ya, Liu Shaoming, Fang Li, et al. Analysis of the tar content of cigarette smoke and the content of some representative carcinogens[J ]. Tobacco Science and Technology/Tobacco Chemistry, 2000(10): 16-17.

At present, reducing the content of harmful substances in cigarettes is mostly based on reducing the amount of harmful substances produced in cigarettes. By controlling the chemical components in the formula, adding tobacco flakes, using expanded shredded tobacco, combustion enhancers, changing cigarette specifications, reducing the amount of shredded tobacco, and reducing the amount of cigarettes The number of suction ports, etc.; to improve the efficiency of flue gas filtration by changing the structure of the filter tip, adding adsorption materials, etc. is rarely used. On the other hand, although acetate fiber used in cigarette filters has the advantages of good taste absorption, firm texture, high efficiency of trapping smoke tar, and beautiful configuration, it is widely used in the high-end tobacco industry, but for the cellulose acetate in a finished cigarette filter The amount of cellulose acetate is certain, which limits its filtering effect on harmful substances in the flue gas.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for preparing a cigarette filter using electrospun cellulose acetate membrane. In this method, nano-cellulose acetate membrane is added to the cigarette filter, which can not only perfectly combine with the cigarette filter, but also strengthen the cigarette filter. It has excellent filtration performance for harmful gases, and at the same time, it is easy to operate, relatively high in efficiency, and significantly reduces the content of various harmful components.

A kind of preparation method of the cigarette filter tip that adopts electrospinning cellulose acetate film of the present invention, comprises:

(1) dissolving cellulose diacetate in a mixed solution of acetone and dimethylacetamide, and carrying out electrospinning to obtain a nanometer cellulose acetate film;

(2) Pull out the cellulose acetate tow in the cigarette, lay the above-mentioned nano-cellulose acetate film between the filter tip and the cigarette along the cross-sectional direction of the filter, and then put the cellulose acetate tow that was pulled out into the cigarette , Cut off the part of the filter beyond the tipping paper to make an improved cigarette filter.

The volume ratio of acetone and dimethylacetamide in the step (1) is 2:1.

The electrospinning process parameters in the step (1) are an applied voltage of 15kV, a receiving distance of 20cm, a solution flow rate of 0.5ml/h, and a mass percent concentration of cellulose diacetate of 9%.

Nanofibrous membranes spun using electrospinning have the following advantages:

(1) It has a larger specific surface area: the smaller the particle size, the larger the specific surface area; because the surface particles lack the coordination of adjacent atoms, the surface energy increases and is extremely unstable, and it is easy to combine with other atoms, showing a strong Active, easy to absorb harmful gases in cigarettes.

(2) High porosity: due to the thinner nanofibers formed, the pores of the nanofiber membrane are small and the porosity is high, which increases its own interception effect on particles and has super filtering performance.

(3) Light and thin, easy to cut: The electrospun nanofiber membrane is very light and thin, which can minimize its influence on the suction resistance; at the same time, it can be cut into various shapes for easy sampling.

Beneficial effect

Compared with other fibers, the cellulose acetate used in the present invention has the advantages of non-toxicity, good hygroscopicity, degradability and better adsorption performance. Electrospinning technology is used to manufacture nano-cellulose acetate film, which is added to cigarette filters. , not only can be perfectly combined with cigarette filters, but also can enhance the filtering performance of cigarette filters for harmful gases. At the same time, it is easy to operate, relatively high in efficiency, and can obviously reduce the content of various harmful components. It has a good market prospect.

Description of drawings

Fig. 1 is the schematic diagram of electrospinning of the present invention; Wherein, 1 is a pressurizing device, 2 is a polymer solution, 3 is a Taylor cone, 4 is a high voltage generating device, 5 is a jet unstable point, and 6 is a receiving device;

Fig. 2 is a schematic diagram of nano-cellulose acetate membrane loading of the present invention.

Detailed ways

Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

Example 1

(1) dissolving cellulose diacetate in a mixed solution of acetone and dimethylacetamide (volume ratio 2:1), and performing electrospinning to obtain a nanometer cellulose acetate film;

(2) Pull out the cellulose acetate tow in the cigarette, lay the above-mentioned nano-cellulose acetate film between the filter tip and the cigarette along the cross-sectional direction of the filter, and then put the cellulose acetate tow that was pulled out into the cigarette , Cut off the part of the filter beyond the tipping paper to make an improved cigarette filter.

Spinning processing parameters: the applied voltage is 15kV, the receiving distance is 20cm, the solution flow rate is 0.5ml/h, and the mass percent concentration of CA (cellulose acetate) is 9%. At this concentration, a 9ml solution volume of nano-cellulose acetate membrane was spun. Add the spun film to the cigarette filter with the addition amount of 10mg/piece according to the method shown in Figure 2, and use the British cerulean company SM45020 channel linear smoking machine to test the cigarette, according to the industry standard YC/T30-1996 of the People's Republic of China, YC /T29-1996 method to determine the content of TPM (tripropylene glycol methyl ether), CO (carbon monoxide), Nicotin (nicotine) and Water (moisture). The experimental data obtained are as follows:

(1) The test results of the suction resistance of the sample

Draw resistance Blank Contrast Smoke Test sample smoke (add filter material) maximum value 1.197 1.958 minimum value 1.052 1.188 Average 1.115 1.375 standard deviation 0.03 0.173

(2) Test and analysis results of filtration efficiency of total particulate matter

(3) Conventional flue gas analysis

Through the analysis of experimental data, it can be seen that after adding the nano-cellulose acetate membrane, the filtration efficiency of the cigarette filter is greatly improved (the filtration efficiency of the 9ml solution sample is increased from 39.71% to 51.14%), and the reduction effect on various harmful components is also very obvious.

Claims (3)

1. preparation method who adopts static to spin the cigarette filter of cellulose acetate film comprises:

(1) cellulose diacetate is dissolved in the mixed solution of acetone and dimethylacetylamide, carries out electrostatic spinning, get the nanometer cellulose acetate film;

(2) diacetate fiber in the cigarette is extracted; Above-mentioned nanometer cellulose acetate film is laid between filter tip and the cigarette along the filter tip cross-sectional direction; The diacetate fiber that to originally extract is again put into cigarette, clips the filter tip part that exceeds tipping paper, processes through improved cigarette filter.

2. a kind of preparation method who adopts static to spin the cigarette filter of cellulose acetate film according to claim 1 is characterized in that: the acetone in the said step (1) and the volume ratio of dimethylacetylamide are 2: 1.

3. a kind of preparation method who adopts static to spin the cigarette filter of cellulose acetate film according to claim 1; It is characterized in that: the electrostatic spinning process parameter in the said step (1) is for applying voltage 15kV; Receiving range 20cm; Solution flow rate 0.5ml/h, the mass percent concentration of cellulose diacetate are 9%.

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