Food-grade modified silica gel for tobacco production equipment, application of food-grade modified silica gel and tobacco production equipment

Abstract

The invention relates to the technical field of tobacco production, in particular to food-grade modified silica gel for tobacco production equipment, application of the food-grade modified silica gel and the tobacco production equipment. The modified silica gel comprises a silica gel raw material and further comprises the following components in percentage by mass: 0.5%-0.8% of a silane coupling agent, 1%-2% of a cross-linking agent, 2%-5% of molybdenum disulfide, 7%-12% of flame-retardant fibers, 5%-15% of a toughening agent, 5%-12% of an anti-sticking agent and 3%-8% of a wear-resistant agent, and the wear-resistant agent is micron-sized wear-resistant powder. A sealing device and a cleaning device of the tobacco production equipment are prepared from the modified silica gel. The modified silica gel has good mechanical property and flame retardance, food-grade safety, long service life and good effect, and cigarettes produced by the equipment can keep good quality.

Description

Technical Field

[0001] The invention relates to the technical field of tobacco production, and in particular to food-grade modified silica gel for tobacco production equipment, and its application and tobacco production equipment. Background Art

[0002] In the production process of the tobacco industry, flat belt conveyors, climbing belt conveyors, lifting feeding conveyors, storage cabinets, material distribution carts, distribution cranes and other tobacco processing equipment all use sealing devices and cleaning devices. The sealing devices and cleaning devices of the tobacco conveyor belts are in direct contact with the belts and act on the conveyed materials for a long time. The use of sealing devices and cleaning devices made of new materials with high mechanical strength, food grade, flame retardant and high wear resistance is one of the important factors in reducing the risk of foreign matter mixing into tobacco materials, reducing equipment leakage and improving the smoking quality of cigarettes.

[0003] The sealing device and the cleaning device are made of silicone. During use, the sealing ring and the sealing edge strip in the sealing device seal the transmission belt to prevent tobacco leakage and jamming. The cleaning device can clean the material on the transmission belt. However, the existing silicone rubber has poor wear resistance and is easily worn and cracked by the squeeze and impact of the material, resulting in poor sealing and cleaning effects.

[0004] What is more serious is that the powdered or detached silicone rubber will be mixed into the tobacco leaves. Although existing technologies can screen and remove impurities in tobacco leaves, these methods are generally only effective for larger and more obvious impurities, and it is difficult to remove tiny silica gel particles or powder. Due to its low flame retardancy, it will burn with the cigarettes in the finished cigarettes, bringing bad smell and reducing the quality of tobacco.

[0005] At the same time, when the sealing device and the cleaning brush head are in use, the silicone rubber generates heat due to friction, and the silicone rubber with low flame retardancy may overheat and spontaneously combust when heated unevenly. Tobacco leaves are flammable substances, which may cause safety hazards in serious cases.

[0006] Existing flame retardant modifiers often contain halogens and cannot meet food grade standards. When used in tobacco machinery, harmful substances will be introduced into tobacco materials.

[0007] Therefore, there is currently no silicone material that can be specifically used for tobacco material transmission belt sealing devices and cleaning devices. Summary of the invention

[0008] The technical problem to be solved by the present invention is to provide food-grade modified silica gel for tobacco production equipment, application and tobacco production equipment.

[0009] The technical solution of the present invention to solve the above technical problems is as follows:

[0010] The food-grade modified silica gel for tobacco production equipment includes a silica gel raw material. Taking the mass of the silica gel raw material as 100%, the modified silica gel also includes: 0.5% to 0.8% of a silane coupling agent, 1% to 2% of a dipentadienyl vulcanizing agent, 2% to 5% of molybdenum disulfide, 7% to 12% of a flame retardant fiber, 5% to 15% of a toughening agent, 5% to 12% of an anti-sticking agent, and 3% to 8% of an anti-wear agent; the anti-wear agent is a micron-grade wear-resistant powder.

[0011] Based on the above technical solution, the present invention can also be improved as follows.

[0012] Furthermore, the mass percentage of the flame retardant fiber is greater than or equal to that of the micron-sized wear-resistant powder.

[0013] Furthermore, the flame retardant fiber is one or more of aramid fiber, carbon fiber, PBO, and PBI.

[0014] Furthermore, the micron-sized wear-resistant powder is micron-sized silicon dioxide powder, micron-sized titanium oxide powder or a mixture of the two.

[0015] Furthermore, the particle size of the micron-grade wear-resistant powder ranges from 0.8 to 2 microns.

[0016] Furthermore, the silane coupling agent is γ-aminopropyltriethoxysilane, the toughening agent is one of polyester fiber and Kevlar fiber or a mixture of the two; and the anti-sticking agent is a mixture of one or more of PTFE, PFA, FEP and polysiloxane.

[0017] Furthermore, 0.5% of γ-aminopropyltriethoxysilane, 1.5% of dipentadienyl vulcanizer, 3% of molybdenum disulfide, 9% of PBI, 10% of the toughening agent, 8% of the anti-sticking agent, and 5% of the micron-sized wear-resistant powder; the toughening agent is a mixture of polyester fiber and Kevlar fiber, the anti-sticking agent is PTFE, the micron-sized wear-resistant powder is a mixture of micron-sized silica powder and micron-sized titanium oxide powder, and the particle size of the micron-sized wear-resistant powder is 1 micron.

[0018] The present invention also provides an application of the food-grade modified silica gel for tobacco production equipment as described above, wherein the food-grade modified silica gel is used to prepare a sealing device and / or a cleaning device of the tobacco production equipment.

[0019] The present invention also provides a tobacco production device, comprising a sealing device and a cleaning device, wherein the sealing device and / or the cleaning device are prepared by using the modified silica gel as described above.

[0020] Furthermore, the sealing device includes a sealing ring and / or a sealing edge strip, the cleaning device includes a brush head and / or bristles, and at least one of the sealing ring, the sealing edge strip, the brush head and the bristles is prepared using the modified silicone as described above.

[0021] The beneficial effects of the present invention are:

[0022] (1) The food-grade modified silica gel for tobacco production equipment of the present invention has a flame retardant fiber with a self-extinguishing effect, and the micron-level wear-resistant powder can make the modified silica gel have good wear resistance. At the same time, the micron-level wear-resistant powder can be evenly filled into the gaps of the flame retardant fiber, effectively improving the wear resistance of the modified silica gel, preventing it from falling off and powdering, and can effectively improve the overall thermal conductivity of the modified silica gel, preventing local overheating caused by friction, thereby further improving the flame retardant effect of the modified silica gel;

[0023] (2) The food-grade modified silica gel for tobacco production equipment of the present invention uses γ-aminopropyltriethoxysilane as a silane coupling agent, which can effectively improve the toughness and aging resistance of the modified silica gel while maintaining good flame retardancy;

[0024] (3) The food-grade modified silica gel for tobacco production equipment of the present invention, molybdenum disulfide has a good self-lubricating effect and a low friction coefficient, which can effectively prevent the modified silica gel from wearing and falling off during friction;

[0025] (4) The food-grade modified silica gel for tobacco production equipment of the present invention, the toughening agent can make the modified silica gel have good toughness and strength, further prevent wear, and the anti-sticking agent can effectively reduce the viscosity of the modified silica gel;

[0026] (5) The food-grade modified silica gel for tobacco production equipment of the present invention has no halogen in its components and can meet the food-grade standard;

[0027] (6) The tobacco production equipment of the present invention uses the modified silica gel of the present invention to prepare the sealing ring and the sealing edge strip, which has good wear resistance and can effectively prevent tobacco leaf leakage and jamming caused by wear or cracking;

[0028] (7) The tobacco production equipment of the present invention adopts the modified silica gel of the present invention to prepare the cleaning device, which can prevent tiny silica gel particles or powder from being mixed into tobacco leaves, and the modified silica gel has a good flame retardant effect and will not burn at the same time as the cigarette, thereby avoiding the bad smell that causes the reduction of tobacco quality;

[0029] (8) The tobacco production equipment of the present invention has high safety, long service life, good effect, and the quality of the produced cigarettes can be guaranteed, and has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the sealing ring structure of the present invention;

[0031] Figure 2 It is a schematic diagram of the structure of a cleaning brush with six equally divided brush heads in the flat belt cleaning brush of the present invention;

[0032] Figure 3 It is a schematic diagram of the structure of the spiral brush head cleaning brush in the flat belt cleaning brush of the present invention;

[0033] Figure 4 It is a schematic diagram of the structure of the flat belt strip brush of the present invention;

[0034] Figure 5 It is a schematic diagram of the structure of a cleaning brush with six equally divided brush heads in a textured climbing belt cleaning brush of the present invention;

[0035] Figure 6 It is a schematic diagram of the structure of the spiral brush head cleaning brush in the textured climbing belt cleaning brush of the present invention. DETAILED DESCRIPTION

[0036] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0037] The food-grade modified silica gel for tobacco production equipment of the present invention comprises a silica gel raw material. Taking the mass of the silica gel raw material as 100%, the modified silica gel further comprises: 0.5% to 0.8% of a silane coupling agent, 1% to 2% of a dipentadienyl vulcanizing agent, 2% to 5% of molybdenum disulfide, 7% to 12% of a flame retardant fiber, 5% to 15% of a toughening agent, 5% to 12% of an anti-sticking agent, and 3% to 8% of an anti-wear agent; the anti-wear agent is a micron-grade anti-wear powder.

[0038] The food-grade modified silica gel for tobacco production equipment of the present invention is added with flame-retardant fiber and micron-level wear-resistant powder at the same time. The flame-retardant fiber itself has a good self-extinguishing effect, and the micron-level wear-resistant powder can make the modified silica gel have good wear resistance. At the same time, the micron-level wear-resistant powder can be evenly filled into the gaps of the flame-retardant fiber, effectively improving the wear resistance of the modified silica gel, preventing it from falling off and powdering, and can effectively improve the overall thermal conductivity of the modified silica gel, preventing local overheating caused by friction, thereby further improving the flame retardant effect of the modified silica gel.

[0039] Preferably, the mass percentage of the flame retardant fiber is greater than or equal to the micron-sized wear-resistant powder; when the mass of the flame retardant fiber is less than the micron-sized wear-resistant powder, the micron-sized wear-resistant powder will be uneven, thereby reducing the heat dissipation of the modified silica gel. Although such modified silica gel has better mechanical properties, its flame retardancy will be greatly reduced and it is still not suitable for use in tobacco production equipment.

[0040] The amount of flame retardant fiber added should not be too much. Too much flame retardant fiber will make the modified silicone difficult to shape and increase the difficulty of preparation.

[0041] Preferably, the silane coupling agent is γ-aminopropyltriethoxysilane, which can effectively improve the toughness and aging resistance of the modified silica gel while maintaining good flame retardancy.

[0042] γ-aminopropyltriethoxysilane is also known as KH-550. In the prior art, there are many types of silane coupling agents, and the effects of different silane coupling agents vary greatly. For example, the toughness of adding coupling agent KH-846 is higher, but after friction, the heat generation of the modified silica gel is also higher, which is not conducive to the flame retardant effect. Silane coupling agents similar to KH-550 are KH-560 and KH-570, and the main functions of both are also toughening and improving strength. However, while toughening, it also leads to a decrease in flame retardant effect. KH-550 is generally used for surface treatment of glass products. It is not the strongest silane coupling agent in terms of toughening. However, since the modified silica gel of the present invention is particularly used in the sealing ring and cleaning device of tobacco production equipment, and the modified silica gel is usually not actively stretched, and the use environment is not an extreme environment, although there is a certain demand for toughness, it is also required to have good flame retardancy. Therefore, in the technical solution of the present invention, γ-aminopropyltriethoxysilane is selected as a coupling agent.

[0043] Molybdenum disulfide is also added to the modified silica gel of the present invention. Molybdenum disulfide has a good self-lubricating effect and a low friction coefficient, and can effectively prevent the modified silica gel from wearing and falling off during friction. Compared with ordinary lubricants, MoS2 has better chemical stability and lubricity, and can make the modified silica gel have good anti-aging performance.

[0044] The dipentadienyl vulcanizing agent of the invention has the functions of cross-linking, vulcanization and curing and meets the requirements of food grade.

[0045] Preferably, the flame retardant fiber is one or more of aramid fiber, carbon fiber, PBO, and PBI.

[0046] More preferably, the flame retardant fiber is PBI.

[0047] Preferably, the micron-sized wear-resistant powder is micron-sized silicon dioxide powder, micron-sized titanium oxide powder or a mixture of the two; using the above micron-sized wear-resistant powder as a wear-resistant agent can further improve the wear resistance of the modified silica gel.

[0048] Preferably, the micron-sized wear-resistant powder is a mixture of silicon dioxide powder and micron-sized titanium oxide powder, and has a particle size ranging from 0.8 to 2 microns.

[0049] Further preferably, the particle size D of the micron-sized wear-resistant powder is 97 0.9~1.1 microns.

[0050] Preferably, the toughening agent is one of polyester fiber and Kevlar fiber or a mixture of the two; the use of the above toughening agent can make the modified silica gel have good toughness and strength, and further prevent wear.

[0051] Preferably, the anti-sticking agent is a mixture of one or more of PTFE, PFA, FEP, and polysiloxane; the use of the above anti-sticking agent can effectively reduce the viscosity of the modified silica gel.

[0052] Preferably, the food-grade modified silica gel of the present invention, based on the mass of the silica gel raw material as 100%, the mass percentage of each component is 0.5% of silane coupling agent, 1.5% of cross-linking agent, 3% of molybdenum disulfide, 9% of PBI, 10% of toughening agent, 8% of anti-sticking agent, and 5% of wear-resistant agent; the food-grade modified silica gel with this ratio has good wear resistance, toughness, aging resistance and self-lubricating properties, and also has the best flame retardancy. At the same time, after long-term friction, there is almost no falling off and powdering of silica gel particles, thereby ensuring the quality of tobacco leaves.

[0053] Preferably, the silica gel raw material is silica gel masterbatch.

[0054] The food-grade modified silica gel of the present invention is prepared by:

[0055] S1. Mixing and reacting a silica gel raw material, a silane coupling agent, and a dipentadienyl vulcanizing agent under heating and a protective atmosphere to obtain a first material.

[0056] S2, mixing the first material with a toughening agent and an anti-sticking agent under heat preservation conditions, and then mixing with molybdenum disulfide to obtain a second material.

[0057] S3. After the second material and the flame-retardant fiber are evenly mixed, add the micron-grade wear-resistant powder, continue mixing until evenly dispersed, pour into a mold, and extrude into shape.

[0058] Preferably, the extrusion molding pressure is 280-320 kg.

[0059] Preferably, in the above preparation method of the present invention, the temperature and protective atmosphere can adopt conventional conditions, the temperature is generally 100-280° C., and the protective atmosphere is nitrogen.

[0060] The sealing device and cleaning device of the invention comprise a sealing ring of a transmission belt, a sealing edge pressure strip, a flat belt cleaning brush, a flat belt strip brush and a patterned climbing belt cleaning brush.

[0061] Specifically, the sealing ring of the tobacco material transmission belt is as follows Figure 1As shown, the sealing ring is made of the modified silica gel of the present invention.

[0062] like Figure 2 and 3 As shown, the flat belt cleaning brush includes a cleaning brush with a six-equally divided brush head and a cleaning brush with a spiral brush head, and the brush heads of both are prepared using the modified silica gel of the present invention.

[0063] like Figure 4 As shown, the brush head of the flat belt strip brush is also prepared using the modified silica gel of the present invention.

[0064] like Figure 5 and 6 As shown, the cleaning brush for the climbing belt with patterns includes a cleaning brush with a six-equal brush head and a cleaning brush with a spiral brush head, and the brush heads of the two cleaning brushes include brush strips and bristles, which are arranged at intervals. The brush strips and bristles are both made of the modified silica gel of the present invention.

[0065] The present invention is illustrated below by means of specific examples.

[0066] Example 1

[0067] This embodiment adopts the method of the present invention to prepare food-grade modified silica gel, and its components are: based on the mass of the silica gel raw material as 100%, it also includes the following components: 0.5% of γ-aminopropyltriethoxysilane, 1.5% of bis(25-pentyl) vulcanizer, 3% of molybdenum disulfide, 9% of PBI, 10% of toughening agent, 8% of anti-sticking agent, and 5% of wear-resistant agent.

[0068] The toughening agent in this embodiment is a mixture of polyester fiber and Kevlar fiber, and the mass ratio of the two is 1:1; the anti-sticking agent is PTFE.

[0069] The micron-sized wear-resistant powder of this embodiment is a mixture of silicon dioxide powder and micron-sized titanium oxide powder, and the particle size of the powder is D 97 0.9 to 1 micron.

[0070] Example 2

[0071] This embodiment adopts the method of the present invention to prepare food-grade modified silica gel, and its components are: based on the mass of the silica gel raw material as 100%, it also includes the following components: 0.8% of γ-aminopropyltriethoxysilane, 2% of bis(25-pentyl) vulcanizer, 2% of molybdenum disulfide, 10% of PBI, 15% of toughening agent, 5% of anti-sticking agent, and 7% of wear-resistant agent.

[0072] The toughening agent in this embodiment is polyester fiber, and the anti-sticking agent is PFA.

[0073] The micron-grade wear-resistant powder in this embodiment is silicon dioxide powder, and the particle size of the powder is D 97 1 to 1.1 microns.

[0074] Example 3

[0075] This embodiment adopts the method of the present invention to prepare food-grade modified silica gel, and its components are: based on the mass of the silica gel raw material as 100%, it also includes the following components: 0.7% of γ-aminopropyltriethoxysilane, 1% of dipentadienyl vulcanizer, 5% of molybdenum disulfide, 7% of PBI, 5% of toughening agent, 12% of anti-sticking agent, and 3% of wear-resistant agent.

[0076] The toughening agent in this embodiment is Kevlar fiber, and the anti-sticking agent is polysiloxane.

[0077] The micron-sized wear-resistant powder in this embodiment is micron-sized titanium oxide powder, and the particle size of the powder is D 97 1 to 1.1 microns.

[0078] Comparative Example 1

[0079] The difference between this comparative example and Example 1 is that magnesium hydroxide flame retardant is used instead of PBI, and other components are the same.

[0080] Comparative Example 2

[0081] The difference between this comparative example and Example 1 is that no micron-grade wear-resistant powder is added, and other components are the same.

[0082] Comparative Example 3

[0083] The difference between this comparative example and Example 1 is that KH-846 is used instead of γ-aminopropyltriethoxysilane, and the particle size of the micron-grade wear-resistant powder used is D 97 Larger than 5 microns.

[0084] The modified silica gels of the above examples and comparative examples were tested for mechanical properties, flame retardancy and anti-aging properties. The specific testing methods are as follows:

[0085] (1) Mechanical property test: According to GB / T 528-1998 standard, the tensile strength and elongation at break of each modified silica gel were tested at 25°C and 50% relative humidity.

[0086] (2) Anti-aging performance test: The modified silica gel of each embodiment and comparative example was heat aged at 300° C. for 72 h. After the treatment, the mechanical properties were tested again to examine the changes in the mechanical properties.

[0087] The test results are shown in Table 1.

[0088] Table 1 Test results of mechanical properties and anti-aging properties of modified silica gel in various embodiments and comparative examples

[0089]

[0090]

[0091] Flame retardant performance test: According to GB / T 10707-2008 standard, the limiting oxygen index test is carried out on each modified silica gel sample of the same size. According to UL 94-2009 standard, the vertical combustion test is carried out on each modified silica gel sample of the same size.

[0092] (2) The results of the flame retardant performance test are shown in Table 2.

[0093] Table 2 Flame retardant properties test results of modified silica gel in various embodiments and comparative examples

[0094] Polar oxygen index % UL-94 Example 1 35.8％ V-0 Example 2 36.1％ V-0 Example 3 35.1％ V-0 Comparative Example 1 28.1％ V-1 Comparative Example 2 31.2％ V-0 Comparative Example 3 30.1％ V-1

[0095] It can be seen from the above test results that the modified silica gels of Examples 1 to 3 all have good mechanical properties and flame retardant properties. After the flame retardant fiber is replaced by magnesium hydroxide flame retardant in Comparative Example 1, the mechanical properties, anti-aging properties and flame retardant effects of the modified silica gel are significantly reduced, indicating that conventional flame retardants cannot meet the needs of tobacco machinery. Comparative Example 2 does not use micron-level wear-resistant powder, resulting in a significant reduction in mechanical properties and anti-aging properties. Although the flame retardant property of the modified silica gel is better, it still cannot meet the needs of tobacco machinery. The mechanical properties and anti-aging properties of Comparative Example 3 are better, but the micron-level wear-resistant powder has a large particle size, resulting in uneven heat dissipation, so that its flame retardancy does not meet the requirements.

[0096] In addition, the Shore A hardness of the modified silica gel of Examples 1 to 3 of the present invention is 68A to 77A. The cleaning device prepared by the modified silica gel can achieve complete cleaning while causing minimal wear to the belt of PVC\PE material, and is particularly suitable for tobacco machinery.

[0097] The modified silicone materials obtained in the above embodiments and comparative examples were prepared into transmission belt sealing rings, sealing rib strips, flat belt cleaning brushes, flat belt strip brushes and textured climbing belt cleaning brushes, and these devices were used to process tobacco leaves of the same batch and type. After a total of 30 days of use, the leakage and jamming of the transmission belts were observed, and the wear of the sealing rings, sealing rib strips and each brush head was observed. The observation results are shown in Tables 3 and 4.

[0098] It should be noted that the wear conditions are divided into three levels: level one means no wear can be seen with the naked eye, level two means slight wear can be seen with the naked eye, and level three means obvious wear can be seen with the naked eye.

[0099] Table 3 Comparison of the wear of the sealing rings and sealing rib strips prepared by the modified silica gel of each embodiment and comparative example and the leakage and jamming of the material during the belt feeding process after 30 days of use

[0100] Leakage Card material Wear grade Example 1 none none Level 1 Example 2 none none Level 1 Example 3 none none Level 1 Comparative Example 1 have none Level 2 Comparative Example 2 have have Level 2 Comparative Example 3 none none Level 1

[0101] It can be seen from Table 3 that the sealing rings and sealing rib strips prepared by the modified rubber of Examples 1 to 3 of the present invention still had no leakage or jamming during the belt feeding process after 30 days of use, and no wear was observed. However, the modified silica gel of Comparative Examples 1 and 2 had poor mechanical properties, resulting in poor sealing, leakage and jamming problems, and slight wear. The modified silica gel of Comparative Example 3 had good mechanical properties and could meet the requirements, but as shown in the above test results, it had poor flame retardancy and could not be applied to tobacco machinery.

[0102] Table 4 Comparison of the flat belt cleaning device and the textured climbing belt cleaning device prepared from the modified silica gel of each embodiment and the comparative example after 30 days of use

[0103]

[0104] It can be seen from Table 4 that the cleaning devices prepared by the modified rubber of Examples 1 to 3 of the present invention, whether flat belt cleaning devices or textured climbing belt cleaning devices, have no wear after 30 days of use. However, the modified silica gel of Comparative Examples 1 and 2 has poor mechanical properties and obvious wear.

[0105] The cleaning brush needs to clean the material and needs to frequently come into contact with the belt, so it is more prone to wear than the sealing ring. Although the modified silica gel of comparative example 3 has better mechanical strength than the modified silica gel of comparative examples 1 and 2, so that it can meet the requirements of the sealing ring, when it is prepared as a cleaning brush, it has obvious self-wear, and the wear level of the textured climbing belt cleaning device is higher, indicating that the wear is relatively serious and its mechanical strength is still difficult to meet the requirements.

[0106] After cleaning with the cleaning devices prepared with the modified rubber of Examples 1 to 3 of the present invention, no material remains on the belt surface, and no obvious wear is observed on the belt surface. Although the cleaning devices of Comparative Examples 1 and 2 do not show obvious wear on the belt surface, there is material residue after cleaning, indicating that the mechanical strength of both is poor and it is difficult to achieve a good cleaning effect. Although Comparative Example 3 can also achieve no-residue cleaning and no obvious wear on the belt, as mentioned above, the modified silica gel of Comparative Example 3 still has obvious wear itself, which cannot meet the requirements of the cleaning brush and cannot be applied to tobacco machinery.

[0107] Since the particles and powders of modified silica gel that fall off after wear are light in weight and small in size, it is difficult to detect whether they are mixed into tobacco leaves by conventional devices. Therefore, in order to investigate the influence of the slight wear of modified rubber on the quality of cigarettes, the present invention also conducted a sensory evaluation on the burning odor of cigarettes produced by the above-mentioned devices, and the results are shown in Table 5.

[0108] The specific method of the above test is to evaluate the tobacco production equipment after it has been used for 30 days. Specifically, 10 cigarettes produced by each group are selected for scoring and the average value is taken. Since this test mainly examines the effect of modified silica gel on odor, only the pleasure, concentration, impurities, irritation, aftertaste and burning properties related to it are evaluated.

[0109] Table 5 Sensory evaluation results

[0110]

[0111] From the above results, it can be seen that the sealing device and cleaning device prepared by using the modified silica gel of Examples 1 to 3, due to the good mechanical properties and flame retardancy of the modified silica gel, are almost not mixed into the tobacco leaves. Even if there may be a slight wear, it does not participate in the burning of the cigarette, and has almost no effect on the quality of the cigarette. Therefore, the total score of the sensory evaluation of the prepared cigarette is high. However, the modified silica gel of Comparative Examples 1 to 3 is prone to slight wear and powdering during use. After these silica gel components are mixed into the tobacco leaves, they will participate in the burning of the cigarette due to their low flame retardancy, resulting in a low total score of the sensory evaluation of the cigarette, indicating that the quality of the cigarette is seriously affected.

[0112] In the present invention, it should be noted that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0113] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0114] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0115] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. Food grade modified silica gel for tobacco production equipment, characterized in that: The modified silica gel comprises silica gel raw materials. Taking the mass of the silica gel raw materials as 100%, the components of the modified silica gel further include: 0.5% to 0.8% of silane coupling agent, 1% to 2% of dipentadienyl vulcanizing agent, 2% to 5% of molybdenum disulfide, 7% to 12% of flame retardant fiber, 5% to 15% of toughening agent, 5% to 12% of anti-sticking agent, and 3% to 8% of wear-resistant agent; the wear-resistant agent is micron-grade wear-resistant powder.

2. The food-grade modified silica gel for tobacco production equipment according to claim 1, characterized in that: The mass percentage of the flame retardant fiber is greater than or equal to that of the micron-sized wear-resistant powder.

3. The food-grade modified silica gel for tobacco production equipment according to claim 1, characterized in that: The flame retardant fiber is one or more of aramid fiber, carbon fiber, PBO, and PBI.

4. The food-grade modified silica gel for tobacco production equipment according to claim 3, characterized in that: The micron-sized wear-resistant powder is micron-sized silicon dioxide powder, micron-sized titanium oxide powder or a mixture of the two.

5. The food-grade modified silica gel for tobacco production equipment according to claim 4, characterized in that: The particle size of the micron-grade wear-resistant powder ranges from 0.8 to 2 microns.

6. The food-grade modified silica gel for tobacco production equipment according to any one of claims 1 to 5, characterized in that: The silane coupling agent is γ-aminopropyltriethoxysilane, the toughening agent is one of polyester fiber and Kevlar fiber or a mixture of the two; the anti-sticking agent is a mixture of one or more of PTFE, PFA, FEP and polysiloxane.

7. The food-grade modified silica gel for tobacco production equipment according to any one of claims 1 to 5, characterized in that: 0.5% of γ-aminopropyltriethoxysilane, 1.5% of bis(25-pentyl)sulfurizer, 3% of molybdenum disulfide, 9% of PBI, 10% of the toughening agent, 8% of the anti-sticking agent, and 5% of the micron-sized wear-resistant powder; the toughening agent is a mixture of polyester fiber and Kevlar fiber, the anti-sticking agent is PTFE, the micron-sized wear-resistant powder is a mixture of micron-sized silicon dioxide powder and micron-sized titanium oxide powder, and the particle size of the micron-sized wear-resistant powder is 1 micron.

8. An application of the food-grade modified silica gel for tobacco production equipment according to any one of claims 1 to 7, characterized in that: The food-grade modified silica gel is used to prepare the sealing device and / or cleaning device of the tobacco production equipment.

9. A tobacco production device, characterized in that: The invention comprises a sealing device and a cleaning device, wherein the sealing device and / or the cleaning device are prepared by using the modified silica gel as described in any one of claims 1 to 7.

10. A tobacco production device according to claim 9, characterized in that: The sealing device includes a sealing ring and / or a sealing edge strip, and the cleaning device includes a brush head and / or bristles. At least one of the sealing ring, the sealing edge strip, the brush head and the bristles is prepared using the modified silica gel as described in any one of claims 1 to 7.

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