High-temperature-resistant composite oil storage cotton and production method thereof
By modifying fiber cotton to form a micro/nanoporous structure, the problem of insufficient oil storage capacity of oil storage cotton is solved, achieving efficient oil storage and thermal stability, and reducing environmental pollution.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-07-18
- Publication Date
- 2026-03-24
AI Technical Summary
Existing oil storage cotton has insufficient oil storage and locking capacity, and its production process causes significant environmental pollution.
By modifying the fiber cotton with lignin, coating agents (beeswax or paraffin) and dopamine, a micro/nanoporous structure is formed through hydrogen bonding and covalent interactions, which improves the oil storage capacity and thermal stability of the oil storage cotton.
It enhances the oil absorption and storage capacity of the oil-absorbing cotton, improves the lifespan and vapor production of e-cigarettes, and reduces environmental pollution.
Abstract
Description
Technical Field
[0001] This invention relates to the field of electronic cigarette technology, and in particular to a high-temperature resistant composite oil-retaining cotton and its production method. Background Technology
[0002] Electronic cigarettes, also known as virtual cigarettes, vaporizers, or aerosol generators, primarily simulate the sensation of smoking to aid in smoking cessation or as a substitute for traditional cigarettes. To improve the airtightness of electronic cigarettes and prevent e-liquid leakage, they typically contain a reservoir cotton. The e-liquid is soaked in the reservoir cotton, which then transports it to the conductive wire for heating and atomization. Therefore, the reservoir cotton is a crucial component of electronic cigarettes.
[0003] The oil-absorbing and locking capacity of the oil-absorbing cotton is closely related to its lifespan and the flavor of e-cigarettes. The stronger the oil-absorbing and locking capacity, the longer the lifespan of the cotton, the greater the vapor production, and the better the flavor. At the same time, the chemical stability of the oil-absorbing cotton also significantly affects the flavor of e-cigarettes and human health. Currently, commonly used oil-absorbing cotton mainly uses PP, PET, PP+PE, or PET+PA materials, utilizing the amide bonds in PA to improve the oil-absorbing rate.
[0004] CN116172261A discloses a method for preparing antibacterial e-cigarette oil-absorbing cotton. The method involves blending an organic antibacterial agent with a hydrophilic polyester in a predetermined ratio to obtain an antibacterial hydrophilic polyester. Then, using a low-melting-point polyester as the sheath and the antibacterial hydrophilic polyester as the core layer, a shaped sheath-core structure fiber is prepared using a two-component melt spinning technique. The fiber is then melt-spun, cooled, shaped, and cut to obtain the oil-absorbing cotton. This method improves the antibacterial ability of the oil-absorbing cotton, reducing the health risks associated with bacterial growth in e-liquid. However, the melt spinning process required for this method is cumbersome.
[0005] CN114027562A discloses a double-layer composite oil-storing cotton and its production method. The method involves spirally winding multiple layers of cellulose fiber nonwoven fabric of a certain width around the inner layer of the oil-storing cotton tube. The through-holes in the outer layer of the oil-storing cotton are concentrically arranged with the through-holes in the inner layer tube. Although automated production is possible, the inner layer of oil-storing cotton prepared from nonwoven fabric is too tight in the hot wire, leading to poor flow and potentially causing the oil-storing cotton to burn out. Summary of the Invention
[0006] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is to enhance the oil absorption and storage capacity of oil storage cotton, while utilizing renewable biological resources in the production process of oil storage cotton to reduce environmental pollution.
[0007] To achieve the above objectives, the present invention adopts the following technical solution:
[0008] A method for producing high-temperature resistant composite oil storage cotton includes the following steps:
[0009] 1) Wash the cotton fibers with toluene and acetone, then ultrasonically wash and air dry;
[0010] 2) Heat lignin and coating agent at 80-120℃ for 20-40 minutes, cool to room temperature, add n-hexane and stir evenly to obtain a suspension, then add the dried fiber cotton from step 1), immerse at room temperature for 20-30 hours, wash, and dry to obtain high-temperature resistant composite oil storage cotton.
[0011] Further, preferably, the production method of the high-temperature resistant composite oil-storage cotton is as follows, by weight:
[0012] 1) Wash 1-5 parts of fiber cotton with toluene and acetone 2-5 times, then ultrasonically wash with water at 20-40KHz and 10-40℃ for 20-50 minutes, and air dry.
[0013] 2) Heat 1-3 parts of lignin and 2-8 parts of coating agent at 80-120℃ for 10-40 minutes, cool to room temperature, add 10-20 parts of n-hexane and stir evenly to obtain a suspension, then add the fiber cotton dried in step 1), place at room temperature for 20-30 hours, wash with water 2-4 times, and dry to obtain high temperature resistant composite oil storage cotton.
[0014] A further preferred embodiment is that the production method of the high-temperature resistant composite oil-storage cotton is as follows, by weight:
[0015] S1 Wash 1-5 parts of fiber cotton with toluene and acetone 2-5 times, then ultrasonically wash with water at 20-40KHz and 10-40℃ for 20-50 minutes, and then air dry.
[0016] S2: Heat 1-3 parts of lignin and 2-8 parts of coating agent at 80-120℃ for 10-40 minutes, cool to room temperature, add 10-20 parts of n-hexane and stir evenly to obtain a suspension; then add the fiber cotton dried in step S1, place at room temperature for 20-30 hours, wash with water 2-4 times, and dry.
[0017] S3 Dissolve 1-3 parts of dopamine hydrochloride in 10-20 parts of water and adjust the pH to 6-9 with Tris buffer solution; then add the dried cotton fibers from step S2, soak at room temperature for 20-30 hours, wash with water 2-4 times, and air dry.
[0018] S4. Place the dried fiber cotton from step S3 into 2-11 parts of isocyanate / toluene solution and react at room temperature for 20-40 minutes. Wash thoroughly with toluene and ethanol aqueous solution 1-4 times and dry to obtain high-temperature resistant composite oil storage cotton.
[0019] Preferably, the coating agent is either beeswax or paraffin.
[0020] Preferably, the thickness of the high-temperature resistant composite oil storage cotton is 1-10 mm.
[0021] Preferably, the fiber cotton is any one of polyethylene terephthalate, polyethylene terephthalate-polyamide copolymer, and polyethylene terephthalate-polylactic acid copolymer.
[0022] Since the oil storage capacity of oil-absorbing cotton is related to the synthetic material of the oil-absorbing cotton, even if polyamide is added to polyethylene terephthalate, the amide bonds in the polyamide match the polarity of the e-liquid and adsorb the e-liquid. However, after testing, the oil storage capacity of oil-absorbing cotton prepared by copolymer of polyamide and polyethylene terephthalate is still far from meeting people's needs.
[0023] Therefore, polyethylene terephthalate (PET) is modified with lignin and coating agents. Lignin or dopamine is then coated with beeswax or paraffin wax. Beeswax and paraffin wax provide low surface energy, reducing the adsorption of moisture from e-liquid and thus improving the e-liquid storage capacity of the cotton. Lignin itself has a three-dimensional structure. Lignin and beeswax / paraffin wax combine to form micro / nano-structures. The compounds of lignin and beeswax or paraffin wax are adsorbed onto the fiber cotton through hydrogen bonds. Even at high temperatures, as the beeswax or paraffin wax melts, the presence of lignin effectively supports the micro / nano-structure, thereby improving the thermal stability of the cotton and allowing it to maintain its hydrophobic and oleophilic properties for a long time.
[0024] Similarly, dopamine can form polydopamine in aqueous solution. Polydopamine can form a strongly adhesive coating on the surface of cotton fibers, thus creating a porous material and improving the oil storage capacity of the cotton.
[0025] The beneficial effects of this invention are:
[0026] Compared with existing technologies, the addition of beeswax and paraffin provides low surface energy for high-temperature resistant composite oil-absorbing cotton; while the addition of lignin can provide a three-dimensional structure. The compound synthesized by lignin and paraffin or beeswax is adsorbed onto polyethylene terephthalate through hydrogen bonds, while dopamine forms polydopamine, forming a strongly adhesive coating on polyethylene terephthalate, thereby improving the hydrophilic oil absorption capacity of the oil-absorbing cotton at high temperatures. Detailed Implementation
[0027] Parameters for using specific chemical substances, source:
[0028] The isocyanate / toluene solution is a mixture of 98g toluene diisocyanate and 2g toluene.
[0029] Lignin, CAS: 9005-53-2.
[0030] Fiber cotton, weight 80-200 g / m 2 Item number HS300019, from Dongguan Hengxin Textile Co., Ltd.
[0031] Commercially available oil storage cotton, product number 005, density 180g / cm³ 3 This comes from Shenzhen Xinguangjie Technology Co., Ltd.
[0032] Tris buffer solution, pH 9.00, 0.05 mol / L.
[0033] Example 1
[0034] A method for producing high-temperature resistant composite oil storage cotton is as follows:
[0035] 1) Wash 3g of fiber cotton three times with toluene and acetone in sequence, then add it to a beaker containing 200mL of distilled water and sonicate at 40KHz and 25℃ for 40min, then air dry.
[0036] 2) Add 2g of lignin to a 200mL beaker containing 5g of beeswax, heat at 100℃ for 30min, then add 22mL of n-hexane and stir until a suspension is obtained. Then add the fiber cotton dried in step 1), immerse at 25℃ for 24h, wash with distilled water 3 times, and dry to obtain a high-temperature resistant composite oil storage cotton with a thickness of 6mm.
[0037] Example 2
[0038] A method for producing high-temperature resistant composite oil storage cotton is as follows:
[0039] 1) Wash 3g of fiber cotton three times with toluene and acetone in sequence, then add it to a beaker containing 200mL of distilled water and sonicate at 40KHz and 25℃ for 40min, then air dry.
[0040] 2) Add 2g of lignin to a 200mL beaker containing 5g of paraffin, heat at 100℃ for 30min, then add 22mL of n-hexane and stir until a suspension is obtained. Then add the fiber cotton dried in step 1), immerse at 25℃ for 24h, wash with distilled water 3 times, and dry to obtain a high-temperature resistant composite oil storage cotton with a thickness of 6mm.
[0041] Example 3
[0042] A method for producing high-temperature resistant composite oil storage cotton is as follows:
[0043] S1 Wash 3g of fiber cotton three times with toluene and acetone in sequence, then add it to a beaker containing 200mL of distilled water and ultrasonically wash it at 40KHz and 25℃ for 40min, and then air dry it.
[0044] S2 Add 2g of lignin to a 200mL beaker containing 5g of paraffin, heat at 100℃ for 30min, then add 22mL of n-hexane and stir until homogeneous to obtain a suspension; then add the fiber cotton dried in step S1, immerse at 25℃ for 24h, wash 3 times with distilled water, and air dry.
[0045] S3 Dissolve 2gkg of dopamine hydrochloride in 15mL of distilled water, adjust the pH to 8 with Tris buffer solution, add the dried cotton fibers from step S2, immerse in the solution at 25℃ for 24h, wash with distilled water 3 times, and air dry.
[0046] S4. Place the dried fiber cotton from step S3 into a solution containing 7 mL of isocyanate / toluene, react at 25°C for 30 min, then wash thoroughly three times with a toluene and ethanol aqueous solution, and dry to obtain a high-temperature resistant composite oil storage cotton with a thickness of 6 mm.
[0047] Compare with Example 1
[0048] A method for producing high-temperature resistant composite oil storage cotton is as follows:
[0049] S1 Wash 3g of fiber cotton three times with toluene and acetone in sequence, then add it to a beaker containing 200mL of distilled water, and ultrasonically wash it for 40min at 40KHz and 25℃, and then air dry.
[0050] S2 Dissolve 2g of dopamine hydrochloride in 15mL of distilled water, adjust the pH to 8 with Tris buffer solution, add the dried cotton fibers from step S1, immerse at 25℃ for 24h, and wash 3 times with distilled water.
[0051] S3. Place the dried fiber cotton from step S2 into a solution containing 7 mL of isocyanate / toluene, react at 25°C for 30 min, then wash thoroughly three times with a toluene and ethanol aqueous solution, and dry to obtain a high-temperature resistant composite oil storage cotton with a thickness of 6 mm.
[0052] Compare with Example 2
[0053] A method for producing high-temperature resistant composite oil storage cotton is as follows:
[0054] S1 Wash 3g of fiber cotton three times with toluene and acetone in sequence, then add it to a beaker containing 200mL of distilled water, and ultrasonically wash it for 40min at 40KHz and 25℃, and then air dry.
[0055] S2 Add 2g of lignin to a 200mL beaker containing 22mL of n-hexane and stir until well mixed. Then add the dried fiber cotton from step S1, immerse it at 25℃ for 24 hours, wash it three times with distilled water, and dry it.
[0056] S3 Dissolve 2g of dopamine hydrochloride in 15mL of distilled water, adjust the pH to 8 with Tris buffer solution, add the dried cotton fibers from step S2, immerse in the solution at 25℃ for 24h, wash three times with distilled water, and air dry.
[0057] S4. Place the dried fiber cotton from step S3 into a solution containing 7 mL of isocyanate / toluene, react at 25°C for 30 min, then wash thoroughly three times with a toluene and ethanol aqueous solution, and dry to obtain a high-temperature resistant composite oil storage cotton with a thickness of 6 mm.
[0058] Compare with Example 3
[0059] A method for producing high-temperature resistant composite oil storage cotton is as follows:
[0060] S1 Wash 3g of fiber cotton three times with toluene and acetone in sequence, then add it to a beaker containing 200mL of distilled water and ultrasonically wash it at 40KHz and 25℃ for 40min, and then air dry it.
[0061] S2 Add 5g of paraffin to a 200mL beaker containing 22mL of n-hexane and stir until dissolved. Then add the dried fiber cotton from step S1 and immerse it at 25℃ for 24 hours. Wash it three times with distilled water and then dry it.
[0062] S3 Dissolve 2g of dopamine hydrochloride in 15mL of distilled water, adjust the pH to 8 with Tris buffer solution, add the dried cotton fibers from step S2, immerse in the solution at 25℃ for 24h, wash with distilled water 3 times, and air dry.
[0063] S4. Place the dried fiber cotton from step S3 into a solution containing 7 mL of isocyanate / toluene, react at 25°C for 30 min, add [unclear text], heat at 100°C for 30 min, cool to 25°C, and then wash thoroughly three times with toluene and ethanol aqueous solution. After drying, a high-temperature resistant composite oil-storage cotton with a thickness of 6 mm is obtained.
[0064] Test Example 1
[0065] Oil storage capacity test of oil storage cotton
[0066] Weigh out a high-temperature resistant composite oil-absorbing cotton, denoted as m0, and soak it in e-liquid for 1 hour. Place the oil-absorbing cotton on the surface of degreased cotton, then fix the degreased cotton on a shaker and shake at a frequency of 1500 r / min for 10 minutes. The mass of the oil-absorbing cotton after shaking is taken as the saturated oil-absorbing capacity, denoted as m1. The saturated unit adsorption capacity of the oil-absorbing cotton is the mass of e-liquid saturated per unit mass of oil-absorbing cotton, calculated using the following formula:
[0067] Saturated unit oil storage capacity = (m1 - m0) / m0
[0068] The oil-absorbing cotton was subjected to two parallel tests, and the average saturated unit oil storage capacity was used to characterize the oil-absorbing cotton's ability to store tobacco oil.
[0069] Table 1 Oil Storage Capacity
[0070] sample Oil storage capacity (g / mL) Example 1 8.85 Example 2 8.34 Example 3 10.27 Compare with Example 1 8.28 Compare with Example 2 9.93 Compare with Example 3 8.82 Commercially available oil storage cotton (PET material) 6.23
[0071] Test Example 1 shows that, compared with Control Examples 1-3, the oil-absorbing cotton modified by adding coating agents, lignin, and dopamine hydrochloride has better oil-absorbing capacity. The high-temperature resistant composite oil-absorbing cotton in Example 3 has a better oil-absorbing effect than Examples 1-2 and Control Examples 1-3. This may be because paraffin and lignin form a micro / nanoporous structure with the fiber cotton through hydrogen bonding. These porous structures can improve the adsorption of e-liquid. Simultaneously, polydopamine forms covalent and non-covalent interactions on the surface of the fiber cotton. The main components of e-liquid include propylene glycol, glycerin, and nicotine. Propylene glycol and glycerin molecules contain hydroxyl groups, which are highly polar; nicotine contains a pyridine ring, which is also polar. The dopamine-modified oil-absorbing cotton surface contains abundant polar groups, which can promote the adsorption of e-liquid.
[0072] Test Example 2
[0073] Thermal stability test of oil storage cotton
[0074] Weigh 100g each of the composite oil-storing cotton prepared in Examples 1-3 and Control Examples 1-3. Cut the cotton samples into multiple 1×1cm square pieces using scissors. Measure the weight loss of the oil-storing cotton using a thermogravimetric analyzer. Under nitrogen protection, heat the cotton to 550℃ at a heating rate of 10℃ / min. T5 represents the temperature at which a 5% mass loss occurs. The high-temperature resistance of polyethylene terephthalate is characterized by comparing T5 values. The results are shown in Table 2.
[0075] Table 2 High Temperature Resistance Test
[0076] sample <![CDATA[T5℃]]> Example 1 298 Example 2 295 Example 3 324 Compare with Example 1 301 Compare with Example 2 302 Compare with Example 3 296 Commercially available oil storage cotton (PET material) 256
[0077] A comparison of Examples 1-3 and Control Examples 1-3 reveals that the oil-storing cotton modified by adding a coating agent, lignin, and dopamine hydrochloride exhibits better thermal stability. The high-temperature resistant composite oil-storing cotton of Example 3 demonstrates better oil storage performance compared to Examples 1-2 and Control Examples 1-3. This may be because lignin itself has a three-dimensional structure, and lignin compounds are bonded to the surface of the fiber cotton via hydrogen bonds. Dissolving the high-temperature resistant composite oil-storing cotton requires a higher temperature to disrupt the three-dimensional structure and hydrogen bond bonding. Similarly, dopamine forms polydopamine, which interacts with both covalent and non-covalent forces on the fiber cotton surface. Disrupting these interactions requires higher energy. Furthermore, paraffin wax provides protection to the surface of the oil-storing cotton, and its melting also requires endothermic reaction. Therefore, the oil-storing cotton prepared in Example 3 exhibits better thermal stability.
Claims
1. A method for producing high-temperature resistant composite oil-storage cotton, characterized in that, The steps include the following, in parts by weight: S1 Wash 1-5 parts of fiber cotton with toluene and acetone 2-5 times, then ultrasonically wash with water at 20-40KHz and 10-40℃ for 20-50 minutes, and then air dry. S2 Heat 1-3 parts of lignin and 2-8 parts of paraffin at 80-120℃ for 10-40 minutes, cool to room temperature, add 10-20 parts of n-hexane and stir evenly to obtain a suspension. Then add the fiber cotton dried in step S1, place at room temperature for 20-30 hours, wash with water 2-4 times, and dry. S3 Dissolve 1-3 parts of dopamine hydrochloride in 10-20 parts of water, adjust the pH to 6-9 with Tris buffer solution, add the dried fiber cotton from step S2, soak at room temperature for 20-30 hours, wash with water 2-4 times, and dry. S4 Place the dried fiber cotton from step S3 into 2-11 parts of isocyanate / toluene solution, react at room temperature for 20-40 minutes, wash thoroughly with toluene and ethanol aqueous solution 1-4 times, and dry to obtain high temperature resistant composite oil storage cotton. The fiber cotton is any one of polyethylene terephthalate, polyethylene terephthalate-polyamide copolymer, and polyethylene terephthalate-polylactic acid copolymer.
2. The production method of high-temperature resistant composite oil-storage cotton as described in claim 1, characterized in that: The thickness of the high-temperature resistant composite oil storage cotton is 1-10mm.
3. A high-temperature resistant composite oil storage cotton, characterized in that: It is prepared by the production method according to any one of claims 1-2.