Flame-resistant threaded incense column and preparation method thereof

Abstract

The invention belongs to the technical field of incense columns, and particularly relates to a flame-resistant threaded incense column and a preparation method thereof. The flame-resistant threaded incense column comprises the following components in parts by weight: 5-20 parts of coconut shell powder, 5-15 parts of carbon powder, 10-30 parts of sandalwood powder, 1-5 parts of cedar powder, 5-15 parts of bamboo powder, 3-8 parts of stearic acid modified silicon dioxide, 5-10 parts of elm bark powder, 5-10 parts of Indonesia nanmu sticky powder, 10-30 parts of a modified binder, 1-5 parts of polyfatty acid and 0.01-0.4 part of a mosquito repelling and killing agent. All the components in the flame-resistant threaded incense column interact with one another, so that the flame-resistant threaded incense column has better flame resistance, breaking resistance, compressive strength, flameout resistance and heat storage stability.

Description

Technical Field

[0001] The present invention belongs to the technical field of incense sticks, and particularly relates to a flame-resistant spiral incense stick and a preparation method thereof. Background Art

[0002] "Incense stick" generally refers to a form of spice, usually made from natural raw materials such as plants, trees, herbs, etc., shaped like a column, and used for incense burning, air freshening or in religious ceremonies. The spiral incense stick is a specially designed incense stick, named after its spiral appearance. When burning, it can release a long-lasting fragrance. At the same time, its unique appearance also makes it an incense product with both aesthetic and practical value.

[0003] The main components of incense sticks usually include: spices such as sandalwood, agarwood, cinnamon, ambergris, etc., which carry unique fragrances; plant materials such as bamboo, wood powder, etc., as the main supports of incense sticks; incense paste or incense powder, made by mixing spices and binders, which is convenient for solidification and burning. CN103816295A provides a formula for a health-care incense stick and a preparation method thereof. The prepared health-care incense stick has a mellow fragrance, is fresh and refreshing, can clear heat and dispel wind, cool the blood and dredge the meridians, soothe the mind and nourish the spirit, has an adjuvant therapeutic effect on heart diseases and neurasthenia, improves sleep quality, and has the effects of calming the nerves, relieving depression, beautifying the skin and reducing wrinkles after long-term use. However, it mainly uses Vietnamese Nhatrang agarwood, and the obtained incense stick has poor flame resistance, and the adhesiveness between the various components in the system is poor; CN104398126A provides a preparation process for an incense stick, which improves the toughness and burning performance of the incense stick by coating a polyvinyl alcohol coating on the outer wall of the incense stick blank, reduces incomplete combustion and the generation amount of carbon monoxide, increases the therapeutic effect on female health, and enhances the bactericidal and mood-soothing effects by sandalwood powder and camphor powder. At the same time, it avoids the scattering of incense ash and improves the ornamental value. However, a polyvinyl alcohol material is covered on the outer peripheral wall surface of the linear matrix, and its surface coating will reduce the anti-drop ability of the incense stick.

[0004] Therefore, there is an urgent need for a flame-resistant spiral incense stick with excellent flame resistance and drop resistance, and strong anti-extinguishing ability. Summary of the Invention

[0005] The object of the present invention is to provide a flame-resistant spiral incense stick and a preparation method thereof, which have excellent flame resistance and drop resistance, and strong anti-extinguishing ability.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] First aspect, a flame-resistant spiral incense stick, by weight, the flame-resistant spiral incense stick comprises the following components: 5-20 parts of coconut shell powder, 5-15 parts of carbon powder, 10-30 parts of sandalwood powder, 1-5 parts of cypress powder, 5-15 parts of bamboo powder, 3-8 parts of stearic acid-modified silica, 5-10 parts of elm bark powder, 5-10 parts of Indonesian nanmu adhesive powder, 10-30 parts of modified binder, 1-5 parts of polyfatty acid, 0.01-0.4 parts of mosquito repellent and insecticide.

[0008] In the flame-resistant spiral incense stick of the present invention, each component interacts with each other, so that the flame-resistant spiral incense stick has better flame resistance, drop resistance and anti-extinguishing ability.

[0009] In order to better improve the comprehensive performance of the flame-resistant spiral incense stick, preferably, by weight, the flame-resistant spiral incense stick comprises the following components: 10-15 parts of coconut shell powder, 8-12 parts of carbon powder, 15-20 parts of sandalwood powder, 2-3 parts of cypress powder, 8-12 parts of bamboo powder, 5-6 parts of stearic acid-modified silica, 6-7 parts of elm bark powder, 6-7 parts of Indonesian nanmu adhesive powder, 15-20 parts of modified binder, 3-4 parts of polyfatty acid, 0.02-0.06 parts of mosquito repellent and insecticide.

[0010] More preferably, by weight, the flame-resistant spiral incense stick comprises the following components: 12 parts of coconut shell powder, 10 parts of carbon powder, 18 parts of sandalwood powder, 2.5 parts of cypress powder, 10 parts of bamboo powder, 5.5 parts of stearic acid-modified silica, 6.5 parts of elm bark powder, 6.5 parts of Indonesian nanmu adhesive powder, 18 parts of modified binder, 3.5 parts of polyfatty acid, 0.03 parts of mosquito repellent and insecticide.

[0011] Coconut shell powder

[0012] Coconut shell powder is a fine powder made from coconut shells through processes such as grinding and crushing. In the production of incense sticks, coconut shell powder also plays an important role. Adding coconut shell powder to the incense stick can not only act as a binder to enhance the formability and stability of the incense stick, but also add a natural coconut fragrance to the incense stick, improving the aroma quality of the incense stick. At the same time, the natural properties of coconut shell powder also make the incense stick more environmentally friendly and safe during the burning process. The inventor of the present invention found that using coconut shell powder in the flame-resistant spiral incense stick of the present invention can better increase the drop resistance of the spiral incense stick, probably because the coconut shell itself has a high hardness and the structure of coconut shell powder is firm, making the final obtained spiral incense stick more durable.

[0013] Carbon powder

[0014] Carbon powder is a chemical powder specially used to improve combustion efficiency and temperature, which can increase the reaction speed of fuel and oxygen, so that the fuel burns more thoroughly. The carbon powder in the present invention, as a combustion aid for threaded incense sticks, can effectively promote the combustion process of incense sticks, making their combustion more stable and sufficient. By adjusting the proportion of carbon powder, the combustion speed of the incense stick can be controlled to ensure that it can continuously and evenly release fragrance during the combustion process; and the carbon powder produces less smoke when burning, which helps to reduce the pollution of indoor air when the incense stick burns and improve the use experience. At the same time, the carbon powder also has certain adsorption properties, which can adsorb and retain the aroma components of some incense stick raw materials, thereby continuously releasing aroma during the combustion process and improving the aroma quality of the incense stick. In the present invention, it is found that the amount of carbon powder is not the more the better. When the amount of carbon powder is too much, it will reduce the flame retardancy of the threaded incense stick, and at the same time, it will reduce the anti-extinguishing ability of the threaded incense stick when there is wind. It may be because the amount of carbon powder is large, the faster the speed after burning, and it will be more susceptible to the influence of wind when there is wind.

[0015] Sandalwood Powder

[0016] Sandalwood powder is usually a fine powder obtained by grinding and processing sandalwood. Sandalwood is a wood with a strong aroma and is widely used in spices and aromatherapy products. Sandalwood powder has a long history, especially in Asia, where sandalwood is known as the "king of spices". Its fragrance is sweet, warm, and smooth, and can soothe the nerves. It is often used in meditation, relaxation and other occasions to help purify the mind and improve concentration. It makes the spiral incense stick release a unique aroma after being ignited. Sandalwood powder can be combined with other spices to make incense sticks suitable for different occasions.

[0017] cypress wood powder

[0018] Cypress powder is a powder obtained by processing and grinding cypress trees. Cypress is a common conifer. Because of its hard wood and natural fragrance, it is widely used in various fields. Cypress has a unique aroma, fresh and slightly pine-like, giving people a sense of tranquility and calmness. It is often used in traditional crafts, medicinal and aromatherapy products. Cypress powder is mixed with spices such as sandalwood powder. Through different proportions, unique aromas are prepared to meet the preferences and occasions of different people. Whether it is used for meditation, yoga, or daily home use, cypress powder can add a natural and harmonious atmosphere to the incense sticks.

[0019] Bamboo powder

[0020] Bamboo powder is a fine powder obtained by processing and grinding bamboo. As a fast-growing plant, bamboo has natural antibacterial, antioxidant and other properties. Bamboo powder is also one of the indispensable raw materials in the production of incense sticks. Bamboo powder has a natural fresh aroma, which can refresh the mind and improve air quality. Adding an appropriate amount of bamboo powder to the incense stick can not only increase the combustion stability of the incense stick, but also make the aroma more gentle and lasting. At the same time, as a natural and environmentally friendly material, bamboo powder also conforms to the concept of modern people pursuing a green life.

[0021] Stearic acid modified silica

[0022] Preferably, the preparation method of the stearic acid modified silica includes: adding stearic acid to anhydrous ethanol and heating and mixing to obtain a stearic acid-ethanol solution; then adding silica to the stearic acid-ethanol solution for reflux reaction, filtering, washing the filter cake with water, and drying at room temperature to obtain stearic acid modified silica.

[0023] In the present invention, it is found that adding stearic acid modified silica can better control the burning rate of the incense stick. And it is found that when adding unmodified silica, although the burning rate of the incense stick can be controlled to a certain extent, the effect is not obvious. It is speculated that it may be because the stearic acid chain segment in the stearic acid modified silica helps the components in the system to be evenly dispersed, so as to enhance the flame resistance and stably bond under the action of the modified binder, making the combustion process more uniform, thus enhancing the flame resistance. At the same time, the mutual adsorption with components such as carbon powder can control the burning rate, making the burning of the incense stick more uniform and continuous, and silica, especially stearic acid modified silica, can better increase the compressive strength.

[0024] Preferably, the average particle size of the silica is 5-6 microns. The silica can be obtained commercially, for example, purchased from Yuanmeng Silicon Industry Co., Ltd. in Bo'ai County, with the model of 160H.

[0025] Preferably, when preparing the stearic acid modified silica, the mass ratio of anhydrous ethanol to stearic acid is 100:(1-2).

[0026] Preferably, when preparing the stearic acid modified silica, the mass ratio of the stearic acid to the silica is 1:(0.8-1).

[0027] Preferably, when preparing the stearic acid modified silica, the mixing conditions include: the temperature is 30-35°C and the time is 20-30 min.

[0028] Preferably, when preparing the stearic acid modified silica, the reflux reaction conditions include: the temperature is 80-85°C and the time is 2-3 h.

[0029] Elm bark powder

[0030] The elm bark powder is a powder made from the bark of the elm tree through drying, grinding and other treatments. It has certain natural characteristics. The elm bark powder is rich in natural resin and sticky substances, which can enhance the adhesion and hardness of the incense stick, making the incense stick less likely to break. The use of the elm bark powder in the present invention can not only increase the flame retardancy of the incense stick, but also increase its stability and sustainability during combustion; at the same time, the elm bark powder itself also has a light fragrance, which can be integrated with spices such as sandalwood and cypress to add a unique charm to the incense stick.

[0031] Indonesian nanmu glue powder

[0032] Indonesian Phoebe Sticky Powder is a wood powder produced by processing Indonesian Phoebe trees. The aroma it emits makes it suitable for use as a spice and can also be used as a filler in incense sticks.

[0033] Modified binder

[0034] The binder in the incense stick, also known as the adhesive, plays a vital role in the incense making process. It not only affects the shaping and stability of the incense stick, but also affects the performance and aroma release of the incense stick when it burns. The binder is an indispensable component in the production of incense sticks. It can bind various incense powders together to form a stable incense stick structure. Without the binder, the incense powder cannot be effectively shaped, and the incense stick cannot be made. The binder currently used in incense sticks is generally a cellulose binder or a rubber powder. Preferably, the modified binder is an N-methyl-N-dodecylbenzylamine modified binder.

[0035] Preferably, the binder in the modified binder is selected from at least one of red yew gum powder, sesbania powder, methyl cellulose, carboxymethyl cellulose and guar gum.

[0036] More preferably, the binder in the modified binder is a combination of red yew gum powder, sesbania powder and guar gum.

[0037] More preferably, the weight ratio of the red gypsum gum powder, sesbania powder and guar gum is 1:(0.5-0.7):(0.1-0.15).

[0038] Red stone vine gum powder (also called red vine gum powder or rattan gum powder) is a natural gum material extracted from red stone vine (or similar rattan plants). Red stone vine gum powder is mainly extracted from the bark, branches and other parts of the red stone vine plant; Red stone vine gum powder contains natural gum and has good adhesion properties.

[0039] Sesbania powder (also called "Sesbania seed powder" or "Sesbania root powder") is a powder made from the roots of Sesbania (a plant).

[0040] Guar gum is a natural polysaccharide mainly extracted from guar beans.

[0041] Preferably, the preparation method of the N-methyl-N-dodecylbenzylamine modified binder comprises: mixing the binder with water at room temperature for 20-30 minutes, then adding N-methyl-N-dodecylbenzylamine (CAS No. 68397-57-9) and continuing stirring for 1-2 hours, and finally freeze-drying to obtain the modified binder.

[0042] Preferably, when preparing the modified N-methyl-N-dodecylbenzylamine modified binder: the mass ratio of the binder to water is (1-2):100; the mass ratio of the N-methyl-N-dodecylbenzylamine to the binder is (0.2-0.3):1.

[0043] Preferably, when preparing the modified N-methyl-N-dodecylbenzylamine modified binder: the freeze-drying conditions include: a temperature of -40°C to -30°C and a time of 12-36 hours.

[0044] At present, the binder used in incense sticks is generally a cellulose binder or glue powder. However, it is found in the system of the present invention that the final powder bonding effect is not good when glue powder is used alone, and the obtained incense stick is easy to break and fall. The modified red stone rattan gum powder, field sesbania powder and guar gum used in the present invention as a binder can increase the bonding effect of the powder and increase the fall resistance of the incense stick. This may be because the red stone rattan gum powder can better bond the various plant powders, and the field sesbania powder has good dispersibility and porosity, and can interact with stearic acid-modified silica to be dispersed in the system. Guar gum can make the system more stable when preparing incense sticks. The interaction between the three makes the components better bonded to form a more stable incense stick. In addition, the modified binder can further increase the flame retardancy and compressive strength of the incense stick. It is speculated that this is because the modified binder can form an adhesive film in the system. This adhesive film protective film not only has good adhesion, but also can control the burning speed, making the mosquito coil burn more stably, while reducing the decomposition rate of the mosquito repellent at high temperature.

[0045] Poly fatty acids

[0046] Polyfatty acids are a type of fatty acids containing multiple double bonds (ie, unsaturated bonds) in their molecular structure. Preferably, the polyfatty acids are selected from at least one of octadecane unsaturated fatty acid dimers, palmitic acid dimer acid, and linoleic acid dimer acid.

[0047] In the present invention, it was unexpectedly discovered that when a small amount of polyfatty acids were added to the system, the flameout resistance of the incense sticks could be better increased. This may be because the polyfatty acids were dispersed in the system and had a stabilizing combustion-supporting effect. The inventors of the present invention also unexpectedly discovered that they could reduce the decomposition of the insect repellent at high temperatures. It is speculated that this is because their interaction with the insect repellent can reduce the decomposition of the insect repellent at high temperatures.

[0048] Insect repellent

[0049] The main function of the insect repellent is to repel or kill mosquitoes. Adding a small amount of the insect repellent in the present invention can make the incense stick in the present invention have a certain ability to repel mosquitoes. The specific type of the insect repellent is not particularly limited, and it can be any specific insect repellent in the art, such as transfluthrin, ES-bioallethrin, etc.

[0050] In a second aspect, the present invention provides a method for preparing the flame-resistant threaded incense stick according to the first aspect of the present invention, the preparation method comprising:

[0051] (1) mixing coconut shell powder, carbon powder, sandalwood powder, cedarwood powder, bamboo powder, stearic acid-modified silica, elm bark powder, Indonesian nanmu sticky powder and a modified binder, grinding the mixture, and passing through a 500-800 mesh sieve to obtain a powder, then adding 0.5-0.8 times the weight of water to mix the mixture, and finally adding polyfatty acid and a mosquito repellent to mix the mixture to obtain a mixture;

[0052] (2) extruding and shaping the mixture to obtain a primary incense stick;

[0053] (3) Drying the incense sticks to a moisture content of ≤5% to obtain flame-resistant spiral incense sticks.

[0054] There is no particular limitation on the mixing in step (1) of the present invention, as long as the components can be mixed evenly. The present invention will not elaborate on this.

[0055] The extrusion and molding method in step (2) of the present invention can be any operation method in the art, for example, the mixture is transferred to an automatic incense beating machine, and the automatic incense beating machine is used to extrude it into a cylindrical incense stick, and then the cylindrical incense stick is sent to an embossing machine to be pressed into a spiral incense stick.

[0056] Compared with the prior art, the present invention has at least the following beneficial effects:

[0057] 1. Good flame resistance: can better prolong the burning time of threaded incense sticks;

[0058] 2. Good drop resistance: not easy to break or lose powder;

[0059] 3. Strong flameout resistance: It is not easy to flame out by itself during the combustion process, and it is not easy to flame out even in strong wind;

[0060] 4. Good heat storage stability: It has better safety and mosquito repellent effect during use, can continuously and stably repel mosquitoes, and is not easily affected by large temperature fluctuations in terms of its performance.

[0061] 5. High compressive strength: It is not easily damaged during transportation, storage or use. Specific implementation manners

[0062] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0063] In the following examples and comparative examples, the sources of raw materials are as follows:

[0064] Coconut shell powder was purchased from Zhuoye Mineral Products Processing Factory in Lingshou County;

[0065] Carbon powder was purchased from Zhuoye Mineral Products Processing Factory in Lingshou County;

[0066] Sandalwood powder was purchased from Xingzhou Mineral Products Processing Factory in Lingshou County;

[0067] Cypress powder was purchased from Xingzhou Mineral Products Processing Factory in Lingshou County;

[0068] Bamboo powder was purchased from Jianshi Mineral Powder Factory in Lingshou County;

[0069] Elm bark powder was purchased from Weinan Dongjiang Tiancheng Industry Co., Ltd.;

[0070] Indonesian nanmu adhesive powder was purchased from Shijiazhuang Hongmeng Perfume Industry Co., Ltd.;

[0071] Red stone rattan gum powder was purchased from Weinan Dongjiang Tiancheng Industry Co., Ltd.;

[0072] Sesbania powder was purchased from Jiangsu Caiwei Biotechnology Co., Ltd.;

[0073] Guar gum was purchased from Jiangsu Caiwei Biotechnology Co., Ltd.

[0074] Dimer of octadecenoic acid was purchased from Sinopharm Chemical Reagent Co., Ltd.;

[0075] Dimer of palmitic acid was purchased from Sinopharm Chemical Reagent Co., Ltd.;

[0076] Dimer of linoleic acid was purchased from Sinopharm Chemical Reagent Co., Ltd.

[0077] Example 1

[0078] This embodiment provides a flame-resistant spiral incense stick. By weight, the flame-resistant spiral incense stick comprises the following components: 15 parts of coconut shell powder, 8 parts of carbon powder, 15 parts of sandalwood powder, 2 parts of cypress powder, 8 parts of bamboo powder, 5 parts of stearic acid-modified silica, 6 parts of elm bark powder, 6 parts of Indonesian nanmu adhesive powder, 15 parts of modified binder, 3 parts of polyfatty acid, and 0.02 part of mosquito repellent and insecticide;

[0079] The preparation method of the stearic acid-modified silica comprises: adding stearic acid to absolute ethanol and heating and mixing to obtain a stearic acid-ethanol solution; then adding silica to the stearic acid-ethanol solution for reflux reaction, filtering, washing the filter cake with water, and drying at room temperature to obtain stearic acid-modified silica; wherein, the average particle size of the silica is 6 microns, purchased from Yuanmeng Silicon Industry Co., Ltd., Bo'ai County, with the model of 160H; the mass ratio of absolute ethanol to stearic acid is 100:1; the mass ratio of stearic acid to silica is 1:0.8; the mixing conditions include: temperature of 30°C and time of 30 min; the reflux reaction conditions include: temperature of 83°C and time of 3 h;

[0080] The modified binder is an N-methyl-N-dodecylbenzylamine modified binder; the binder in the modified binder is a combination of red rattan gum powder, sesbania powder and guar gum, and their weight ratio is 1:0.5:0.1;

[0081] The preparation method of the N-methyl-N-dodecylbenzylamine modified binder comprises: mixing the binder and water at room temperature for 25 minutes, then adding N-methyl-N-dodecylbenzylamine (CAS No. 68397-57-9) and continuing to stir for 1.5 hours, and finally performing freeze-drying to obtain the modified binder; wherein, the mass ratio of the binder to water is 1.5:100; the mass ratio of N-methyl-N-dodecylbenzylamine to the binder is 0.25:1; the freeze-drying conditions include: temperature of -35°C and time of 24 hours;

[0082] The polyfatty acid is selected from the dimer of unsaturated fatty acid with 18 carbon atoms;

[0083] The mosquito repellent and insecticide is transfluthrin (CAS No.: 118712-89-3);

[0084] The preparation method of the flame-resistant spiral incense stick comprises:

[0085] (1) Mixing coconut shell powder, carbon powder, sandalwood powder, cypress powder, bamboo powder, stearic acid-modified silica, elm bark powder, Indonesian nanmu adhesive powder and modified binder, grinding, passing through a 600-mesh sieve to obtain a powder, then adding 0.5 times the weight of water for mixing, and finally adding polyfatty acid and mosquito repellent and insecticide for mixing to obtain a mixture;

[0086] (2) Transfer the mixture to an automatic incense stick making machine, and use the machine to extrude it into cylindrical stick incense. Then, send the cylindrical stick incense into a corrugating machine to press it into a preliminary spiral incense column product.

[0087] (3) Dry the above-mentioned preliminary incense product until the moisture content reaches 2.37 wt%, and then a flame-resistant spiral incense column is obtained.

[0088] Example 2

[0089] This example provides a flame-resistant spiral incense column. By weight, the flame-resistant spiral incense column comprises the following components: 15 parts of coconut shell powder, 12 parts of carbon powder, 20 parts of sandalwood powder, 3 parts of cypress powder, 12 parts of bamboo powder, 6 parts of stearic acid-modified silica, 7 parts of elm bark powder, 7 parts of Indonesian nanmu adhesive powder, 20 parts of modified binder, 4 parts of polyfatty acid, and 0.06 part of mosquito repellent and insecticide.

[0090] The preparation method of the stearic acid-modified silica comprises: adding stearic acid to anhydrous ethanol and heating and mixing to obtain a stearic acid-ethanol solution; then adding silica to the stearic acid-ethanol solution for reflux reaction, filtering, washing the filter cake with water, and drying at room temperature to obtain stearic acid-modified silica; wherein, the average particle size of the silica is 6 microns, purchased from Yuanmeng Silicon Industry Co., Ltd., Bo'ai County, with the model of 160H; the mass ratio of anhydrous ethanol to stearic acid is 100:2; the mass ratio of stearic acid to silica is 1:1; the mixing conditions include: temperature of 35°C and time of 20 min; the reflux reaction conditions include: temperature of 83°C and time of 2 h.

[0091] The modified binder is an N-methyl-N-dodecylbenzylamine modified binder; the binder in the modified binder is a combination of red rattan gum powder, sesbania powder and guar gum, and their weight ratio is 1:0.7:0.15.

[0092] The preparation method of the N-methyl-N-dodecylbenzylamine modified binder comprises: mixing the binder with water at room temperature for 30 minutes, then adding N-methyl-N-dodecylbenzylamine (CAS No. 68397-57-9) and continuing to stir for 1 hour, and finally performing freeze-drying to obtain the modified binder; wherein, the mass ratio of the binder to water is 2:100; the mass ratio of N-methyl-N-dodecylbenzylamine to the binder is 0.3:1; the freeze-drying conditions include: temperature of -40°C and time of 12 h.

[0093] The polyfatty acid is selected from palmitic acid dimer acid.

[0094] The mosquito repellent and insecticide is transfluthrin (CAS No.: 118712-89-3).

[0095] The preparation method of the flame-resistant spiral incense column comprises:

[0096] (1) Mix coconut shell powder, carbon powder, sandalwood powder, cypress powder, bamboo powder, stearic acid modified silica, elm bark powder, Indonesian nanmu adhesive powder with a modified binder, grind them, sieve through 800 mesh, and then add 0.8 times the weight of water for mixing. Finally, add polyfatty acid and mosquito repellent and insecticide for mixing to obtain a mixture;

[0097] (2) Transfer the mixture to an automatic incense making machine, and use the automatic incense making machine to extrude it into cylindrical stick incense. Then, send the cylindrical stick incense into a corrugating machine to press it into a spiral incense column primary product;

[0098] (3) Dry the above-mentioned primary incense product to a moisture content of 2.41 wt%, and then a flame-resistant spiral incense column is obtained.

[0099] Example 3

[0100] This example provides a flame-resistant spiral incense column. By weight, the flame-resistant spiral incense column includes the following components: 12 parts of coconut shell powder, 10 parts of carbon powder, 18 parts of sandalwood powder, 2.5 parts of cypress powder, 10 parts of bamboo powder, 5.5 parts of stearic acid modified silica, 6.5 parts of elm bark powder, 6.5 parts of Indonesian nanmu adhesive powder, 18 parts of modified binder, 3.5 parts of polyfatty acid, 0.03 part of mosquito repellent and insecticide;

[0101] The preparation method of the stearic acid modified silica includes: adding stearic acid to anhydrous ethanol and heating for mixing to obtain a stearic acid-ethanol solution; then adding silica to the stearic acid-ethanol solution for reflux reaction, filtering, washing the filter cake with water, and drying at room temperature to obtain stearic acid modified silica; among them, the average particle size of silica is 6 microns, purchased from Yuanmeng Silicon Industry Co., Ltd., Bo'ai County, with the model of 160H; the mass ratio of anhydrous ethanol to stearic acid is 100:1.5; the mass ratio of stearic acid to silica is 1:0.9; the mixing conditions include: temperature is 33 °C, time is 25 min; the reflux reaction conditions include: temperature is 82 °C, time is 2.5 h;

[0102] The modified binder is an N-methyl-N-dodecylbenzylamine modified binder; the binder in the modified binder is a combination of red rattan gum powder, sesbania powder and guar gum, and their weight ratio is 1:0.6:0.12;

[0103] The preparation method of the N-methyl-N-dodecylbenzylamine modified binder includes: mixing the binder with water at room temperature for 20 minutes, then adding N-methyl-N-dodecylbenzylamine (CAS No. 68397-57-9) and continuing to stir for 2 hours, and finally performing freeze-drying to obtain the modified binder; among them, the mass ratio of the binder to water is 1:100; the mass ratio of N-methyl-N-dodecylbenzylamine to the binder is 0.2:1; the freeze-drying conditions include: temperature is -30 °C, time is 36 hours;

[0104] The polyfatty acid is selected from linoleic acid dimer acid;

[0105] The mosquito repellent and insecticide is transfluthrin (CAS No.: 118712-89-3);

[0106] The preparation method of the flame-resistant spiral incense stick includes:

[0107] (1) Mix coconut shell powder, carbon powder, sandalwood powder, cypress powder, bamboo powder, stearic acid-modified silica, elm bark powder, Indonesian nanmu adhesive powder and modified binder, then grind and sieve through 800 meshes to obtain powder material. After that, add 0.6 times the weight of water for mixing, and finally add polyfatty acid and mosquito repellent and insecticide for mixing to obtain a mixture;

[0108] (2) Transfer the mixture to an automatic incense-making machine, and make it into a cylindrical stick incense through extrusion by the automatic incense-making machine. Then send the cylindrical stick incense into a corrugating machine to press it into a spiral incense stick primary product;

[0109] (3) Dry the above-mentioned primary incense product to a moisture content of 2.50 wt%, and then the flame-resistant spiral incense stick is obtained.

[0110] Comparative Example 1

[0111] The difference between this comparative example and Example 1 is that the weight part of carbon powder is 35 parts.

[0112] Comparative Example 2

[0113] The difference between this comparative example and Example 1 is that stearic acid-modified silica is replaced by carbon powder, that is, the carbon powder is 13 parts and the stearic acid-modified silica is 0 part.

[0114] Comparative Example 3

[0115] The difference between this comparative example and Example 1 is that stearic acid-modified silica is replaced by silica, the average particle size of the silica is 6 microns, it is purchased from Yuanmeng Silicon Industry Co., Ltd., Bo'ai County, and the model is 160H.

[0116] Comparative Example 4

[0117] The difference between this comparative example and Example 1 is that polyfatty acid is replaced by oxalic acid (CAS No. is 144-62-7).

[0118] Comparative Example 5

[0119] The difference between this comparative example and Example 1 is that the binder in the modified binder is red rattan tree gum powder.

[0120] Comparative Example 6

[0121] The difference between this comparative example and Example 1 is that the binder in the modified binder is sesbania powder.

[0122] Comparative Example 7

[0123] The difference between this comparative example and Example 1 is that the binder in the modified binder is guar gum.

[0124] Comparative Example 8

[0125] The difference between this comparative example and Example 1 is that the modified binder is replaced with an unmodified binder, that is, the unmodified binder is a combination of red rattan gum powder, sesbania powder and guar gum, and their weight ratio is 1:0.5:0.1.

[0126] Performance Test

[0127] 1. Place the flame-retardant spiral incense stick in a thermostatic and humid box at a temperature of 25±2°C and a relative humidity of 65% for 24 hours, then take it out and vertically insert it into the incense burner. Use a pen to draw two lines on the flame-retardant spiral incense stick to be tested, with a distance of at least 10 cm between the lines, and light it in a windless environment; start timing when the flame reaches the first line and stop timing when it reaches the second line, and calculate the burning speed, with the unit of min / cm.

[0128] 2. Compressive strength: Use a pressure strength tester to measure the pressure readings at 2 cm from the head, the middle, and 2 cm from the tail of the flame-retardant spiral incense stick respectively, and calculate their average value. Measure three times and take the minimum value as the measurement result.

[0129] 3. Drop resistance: Freely drop the flame-retardant spiral incense stick from a height of 1.5 m (a total of 10 times). If the mosquito coil does not show breakage, cracking, or damage and the average damage rate is less than 0.5%, it is recorded as qualified, otherwise it is unqualified; among them, the damage rate = (the mass of the incense stick before dropping - the mass of the incense stick after dropping) / the mass of the incense stick before dropping * 100%.

[0130] 4. Flameout resistance: Place the flame-retardant spiral incense stick in a thermostatic and humid box at a temperature of 26±2°C and a relative humidity of 65% for 24 hours, then take it out and vertically insert it into the incense burner. Light it in a windless environment and blow it with a fan at the first gear for 10 s every 5 minutes. During this period, if it does not go out, it is qualified, otherwise it is unqualified.

[0131] 5. Thermal storage stability: Determine the mass fraction w1 of transfluthrin in the flame-retardant spiral incense stick. Place the flame-retardant spiral incense stick in a constant temperature oven at 54±2°C for 14 days, and within 24 hours, use liquid chromatography to determine the mass fraction w2 of transfluthrin, and calculate the relative decomposition rate of the mass fraction of transfluthrin. The decomposition rate = (w1 - w2) / w1 * 100%.

[0132] The test results are shown in Table 1.

[0133] Table 1: Test Results

[0134]

[0135]

[0136] From the above performance test results, it can be seen that the various components in Examples 1-3 interact with each other, making the flame-retardant spiral incense stick have better flame resistance, drop resistance, compressive strength, flame extinction resistance and heat storage stability. In particular, the comprehensive performance of Example 3 is the most prominent. In the comparative examples, because the necessary technical solutions are not adopted, their performance in the corresponding performance tests is significantly worse than that of the examples. Specifically, in Comparative Example 1, when the amount of carbon powder is too large, it will reduce the flame resistance of the spiral incense stick and at the same time reduce the flame extinction resistance of the spiral incense stick when there is wind; in Comparative Example 2, when stearic acid-modified silica is replaced with carbon powder, the flame resistance of the spiral incense stick is significantly reduced and the compressive strength is reduced to a certain extent; in Comparative Example 3, when unmodified silica is used to replace stearic acid-modified silica, although the burning rate of the incense stick can be controlled to a certain extent, the drop resistance and compressive strength of the obtained incense stick are poor; in Comparative Example 4, without polyfatty acid, the flame extinction resistance of the finally obtained incense stick is unqualified and the heat storage stability is poor; in Comparative Examples 5-7, red stone rattan gum powder, sesbania powder, and guar gum are used separately as binders for modification to obtain modified binders, and the drop resistance of the finally obtained incense sticks is unqualified and the heat storage stability is poor. It can be concluded that the modified red stone rattan gum powder, sesbania powder and guar gum in the system of the present invention can synergistically increase the drop resistance and heat storage stability of the incense stick better; in Comparative Example 8, the binder is not modified, and the flame resistance and heat storage stability of the finally obtained incense stick are poor, further indicating that the modified binder in the present invention can further increase the flame resistance and heat storage stability of the incense stick. The above experimental results further prove the importance of the technical solutions defined in the present invention for its technical effects.

[0137] The above is the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle described in the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A flame-resistant threaded incense stick, characterized in that: The flame-resistant threaded incense column comprises the following components by weight: 5-20 parts of coconut shell powder, 5-15 parts of carbon powder, 10-30 parts of sandalwood powder, 1-5 parts of cedar powder, 5-15 parts of bamboo powder, 3-8 parts of stearic acid-modified silicon dioxide, 5-10 parts of elm bark powder, 5-10 parts of Indonesian nanmu sticky powder, 10-30 parts of modified adhesive, 1-5 parts of polyfatty acid and 0.01-0.4 parts of mosquito repellent.

2. The flame-resistant threaded incense stick according to claim 1, characterized in that: The flame-resistant threaded incense column comprises the following components by weight: 10-15 parts of coconut shell powder, 8-12 parts of carbon powder, 15-20 parts of sandalwood powder, 2-3 parts of cedar powder, 8-12 parts of bamboo powder, 5-6 parts of stearic acid modified silica, 6-7 parts of elm bark powder, 6-7 parts of Indonesian nanmu sticky powder, 15-20 parts of modified adhesive, 3-4 parts of polyfatty acid, and 0.02-0.0.06 parts of mosquito repellent.

3. The flame-resistant threaded incense stick according to claim 1 or 2, characterized in that: The preparation method of stearic acid-modified silicon dioxide comprises: adding stearic acid to anhydrous ethanol, heating and mixing to obtain a stearic acid-ethanol solution; then adding silicon dioxide to the stearic acid-ethanol solution for reflux reaction, filtering, washing the filter cake with water, and drying at room temperature to obtain the stearic acid-modified silicon dioxide.

4. The flame-resistant threaded incense stick according to claim 3, characterized in that: The average particle size of the silicon dioxide is 5-6 microns; the mass ratio of anhydrous ethanol to stearic acid is 100:(1-2); and the mass ratio of stearic acid to silicon dioxide is 1:(0.8-1).

5. The flame-resistant threaded incense stick according to claim 3, characterized in that: The mixing conditions include: temperature of 30-35° C., time of 20-30 min; the reflux reaction conditions include: temperature of 80-85° C., time of 2-3 h.

6. The flame-resistant threaded incense stick according to claim 1 or 2, characterized in that: The modified binder is an N-methyl-N-dodecylbenzylamine modified binder; the binder in the modified binder is selected from at least one of red stone vine gum powder, sesbania powder, methyl cellulose, carboxymethyl cellulose and guar gum.

7. The flame-resistant threaded incense stick according to claim 6, characterized in that: The binder in the modified binder is a combination of red stone vine gum powder, sesbania powder and guar gum.

8. The flame-resistant threaded incense stick according to claim 7, characterized in that: The weight ratio of the red stone vine gum powder, sesbania powder and guar gum is 1: (0.5-0.7): (0.1-0.15).

9. The flame-resistant threaded incense stick according to claim 1 or 2, characterized in that: The poly fatty acid is selected from at least one of octadecane unsaturated fatty acid dimer, palmitic acid dimer acid and linoleic acid dimer acid.

10. A method for preparing the flame-resistant threaded incense stick according to any one of claims 1 to 9, characterized in that: The preparation method comprises: (1) mixing coconut shell powder, carbon powder, sandalwood powder, cedarwood powder, bamboo powder, stearic acid-modified silica, elm bark powder, Indonesian nanmu sticky powder and a modified binder, grinding the mixture, and passing through a 500-800 mesh sieve to obtain a powder, then adding 0.5-0.8 times the weight of water to mix the mixture, and finally adding polyfatty acid and a mosquito repellent to mix the mixture to obtain a mixture; (2) extruding and shaping the mixture to obtain a primary incense stick; (3) Drying the incense sticks to a moisture content of ≤5% to obtain flame-resistant spiral incense sticks.

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