Formula and processing method of slow-burning paper

Abstract

The invention provides a slow-burning paper formula and a processing method thereof, and belongs to the technical field of aromatherapy, the slow-burning paper formula comprises the following raw materials by weight: 70-80% of distilled water, 5-6% of potassium carbonate, 0.5-1% of potassium hydroxide, 13-23% of ethanol, and pure wood pulp paper as a base material; the purity of the potassium carbonate is more than or equal to 99%, the particle size is less than or equal to 100 meshes, the potassium carbonate is a flaky solid, the solubility of the potassium carbonate at 20 DEG C is more than or equal to 110 g per 100 g of water, the ethanol is absolute ethyl alcohol with the volume concentration of 95-99.7%, and the impurity content of the ethanol is less than or equal to 0.3%; a traditional potassium nitrate or saltpeter combustion improver is replaced with a composite formula of potassium carbonate, potassium hydroxide and ethyl alcohol, poisonous gas such as nitric oxide cannot be generated during combustion of the slow-combustion paper, generation of incomplete combustion products such as carbon monoxide, aldehydes and tar can be inhibited in the combustion process of potassium acetate, and the pollution problem caused by decomposition of the combustion improver is avoided; the environment-friendly and health requirements are met.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of aromatherapy, more particularly relates to a slow-burning paper formula and a processing method thereof. BACKGROUND

[0002] In the field of space odor purification and fragrance diffusion, traditional household aromatherapy products such as incense, aromatherapy candles, ultrasonic water agent fragrance diffusers, and waterless aromatherapy have been widely used. However, these products still have defects: incense and candles are prone to produce open flames when burning, which poses a safety hazard; during the burning process, harmful by-products such as black smoke, tar, carbon monoxide, and aldehydes are easily generated due to incomplete oxidation, polluting the indoor environment; the carrier material is difficult to flexibly print or design in patterns, limiting the decoration and portability.

[0003] The existing paper fragrance carrier has the characteristics of being printable and easy to shape, but ordinary paper has a high decomposition activation energy when burning, and the burning rate is fast and difficult to control, which easily produces a large amount of open flame and smoke. In order to slow down the burning, some technologies use potassium nitrate or saltpeter as a combustion improver to impregnate the paper. Although such strong oxidizing agents can adjust the burning speed, they will introduce toxic gases such as nitrogen oxides, the burning residue contains irritating odors, and the ash color is dark, which does not meet the environmental protection and health needs. Therefore, a new type of slow-burning paper is needed to achieve the goal of stable and slow burning, inhibition of harmful gas generation, elimination of black smoke, and production of clean ash. SUMMARY

[0004] In order to solve the above technical problems, the present application provides a slow-burning paper formula and a processing method thereof to solve the technical problems in the prior art that traditional paper fragrance carriers easily produce a large amount of open flame and smoke, and the combustion improver additive uses potassium nitrate or saltpeter, which will introduce toxic gases such as nitrogen oxides, not meeting the environmental protection and health needs.

[0005] The purpose and effect of the slow-burning paper formula and the processing method thereof of the present application are achieved by the following specific technical means:

[0006] A slow-burning paper formula includes the following raw materials by weight percentage:

[0007] 70% to 80% of distilled water, 5% to 6% of potassium carbonate, 0.5% to 1% of potassium hydroxide, 13% to 23% of ethanol, and pure wood pulp paper as the base material;

[0008] The purity of the potassium carbonate is ≥99%, and the particle size is ≤100 mesh. The potassium hydroxide is a flaky solid, and the solubility at 20°C is ≥110g / 100g of water. The ethanol is anhydrous ethanol with a volume concentration of 95% to 99.7%, and the impurity content is ≤0.3%.

[0009] According to a preferred embodiment, the pure wood pulp paper is made of 100% coniferous wood pulp or broad-leaved wood pulp, with a tear degree ≥800 mN, burst degree ≥2.5 kPa, basis weight 250-350 g / m 2 , fiber length 1.5-2.5 mm, and beating degree 30-40°SR.

[0010] According to a preferred embodiment, the slow-burning paper has a burning rate of 2-5 mm / min when ignited, a smoke transmission rate ≥90% during the burning process, no visible black smoke, a benzo[a]pyrene content in the smoke ≤0.08 μg / m 3 , a carbon monoxide concentration ≤40 ppm, a formaldehyde concentration ≤0.05 mg / m 3 , and a burning ash color being ash white.

[0011] According to a preferred embodiment, the slow-burning paper has a benzo[a]pyrene content in the smoke ≤0.1 μg / m 3 , and a carbon monoxide concentration ≤50 ppm.

[0012] A processing method of a slow-burning paper formula, the processing method comprising the following steps:

[0013] S1: preparation of a potassium carbonate aqueous solution

[0014] 5-6% potassium carbonate is added to 70-80% distilled water to enhance the alkalinity of the aqueous solution through a hydrolysis reaction, and a potassium carbonate aqueous solution is prepared for standby;

[0015] S2: preparation of a potassium ethoxide solution

[0016] In a reaction kettle, 0.5-1% potassium hydroxide is added to 13-23% ethanol in batches, and the mixture is heated to prepare a potassium ethoxide solution for standby;

[0017] S3: mixing the potassium carbonate aqueous solution of S1 with the potassium ethoxide solution of S2 to generate a potassium acetate solution through an oxidation reaction under alkaline conditions;

[0018] S4: transferring the potassium acetate solution into a sealed stainless steel tank, and standing at 20-25°C for 24-48 hours; when the transmittance of the solution is ≥90%, the aging is terminated, and a potassium acetate aqueous solution containing potassium ions is obtained;

[0019] S5: immersing the pure wood pulp paper into the potassium acetate aqueous solution for 30 minutes, and drying after taking out to obtain the finished slow-burning paper.

[0020] According to a preferred embodiment, in S1, the temperature of the hydrolysis reaction is 20-30°C, and the reaction time is 10-15 minutes, until the pH value of the solution reaches 9-10.

[0021] According to a preferred embodiment, in S2, the temperature of the warming mixing is 65-75℃, the mixing time is 12-18 minutes, and the mixing rotation speed is 200-300 rpm.

[0022] According to a preferred embodiment, in S3, the oxidation reaction is carried out under stirring, the stirring rotation speed is 250-350 rpm, the reaction temperature is 50-60℃, the pH value of the oxidation reaction is controlled at 10.5-11.5 by adding potassium carbonate or potassium hydroxide solution, and the reaction time is 1.2-1.8 hours.

[0023] According to a preferred embodiment, in S5, the soaking process is carried out at room temperature, the solution is stirred during soaking, the stirring rotation speed is 100-150 rpm, the drying method is hot air drying, and the hot air drying is divided into three stages:

[0024] 50-55℃ pre-drying for 2 minutes to reduce the moisture content of the paper to 25%;

[0025] 60-65℃ main drying for 3 minutes to reduce the moisture content of the paper to 12%;

[0026] 68-70℃ fine drying for 1 minute to reduce the moisture content of the paper to ≤8%.

[0027] Compared with the prior art, the present application has the following beneficial effects:

[0028] 1. By using a composite formula of potassium carbonate, potassium hydroxide and ethanol to replace traditional potassium nitrate or nitre combustion improver, the slow-burning paper does not produce toxic gases such as nitrogen oxides during combustion. The potassium carbonate and potassium hydroxide in the formula are oxidized to form potassium acetate, which can inhibit the formation of incomplete combustion products such as carbon monoxide, aldehydes and tar during the combustion process, thereby blocking the production path of harmful gases from the source. Compared with traditional paper fragrance carrier, the formula avoids the pollution problem caused by the decomposition of combustion improver, and meets the environmental protection and health needs.

[0029] 2. The processing method makes potassium ions uniformly penetrate into the pure wood pulp paper fibers through hydrolysis, oxidation, standing and aging process steps, forming a catalytic combustion structure. This treatment stabilizes the paper burning rate in a reasonable range, does not produce open flames during combustion, and has high smoke transmittance and no visible black smoke. By controlling the pH value, reaction temperature and time of the solution, the paper fibers are fully oxidized, avoiding the problem of dense smoke caused by incomplete combustion of traditional products, and improving the safety of the use scene. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a step flow chart of a processing method of a slow-burning paper formula of the present application. DETAILED DESCRIPTION

[0031] The embodiments of the present application will be further described in detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the technical solutions of the present application, but cannot be used to limit the protection scope of the present application.

[0032] Embodiment:

[0033] As shown in the accompanying Figure 1 drawings:

[0034] The present application provides a slow-burning paper formula, comprising the following raw materials by weight percentage: distilled water 70% to 80%, potassium carbonate 5% to 6%, potassium hydroxide 0.5% to 1%, ethanol 13% to 23%, and pure wood pulp paper as a base material;

[0035] Specifically, the formula replaces the potassium nitrate or nitre combustion improver used in the traditional paper fragrance diffusing carrier with a composite system of potassium carbonate, potassium hydroxide and ethanol, avoiding the generation of toxic gases such as nitrogen oxides during combustion from the selection of ingredients; the potassium carbonate in the formula is dissolved in distilled water to enhance the alkalinity of the solution through hydrolysis reaction, and the potassium ethoxide solution formed by mixing and warming with ethanol undergoes oxidation reaction, finally generating potassium acetate; this potassium acetate plays a key role in the slow-burning paper combustion process, effectively inhibiting the generation of incomplete combustion products such as carbon monoxide, aldehydes and tar, and blocking the source of harmful gas generation from the chemical reaction path; compared with the traditional paper fragrance diffusing carrier, the formula completely eliminates the combustion improver component which is easy to decompose and pollute, generates substances with catalytic combustion effect through chemical reactions between raw materials, significantly reduces the content of harmful substances in the combustion products while ensuring slow paper burning, and well meets the demand for environmentally friendly and healthy products in modern society.

[0036] The purity of potassium carbonate needs to reach ≥99%, which can reduce the interference of impurities on subsequent chemical reactions, and its particle size is controlled at ≤100 mesh, which can ensure its full dissolution in distilled water to form a uniform aqueous solution; the solubility of potassium hydroxide at 20℃ is ≥110g / 100g water, which ensures that it can fully react to generate potassium ethoxide solution when mixed and warmed with ethanol; the ethanol selected is anhydrous ethanol with a volume concentration of 95% to 99.7%, and the impurity content is ≤0.3%, which can avoid the influence of other components in ethanol on the oxidation reaction process and the purity of potassium acetate solution.

[0037] The pure wood pulp paper is made of 100% coniferous wood pulp or broad-leaved wood pulp, which can ensure the purity and consistency of the paper fibers, its tear resistance is ≥800mN, which makes the paper not easy to break during processing and use, and the burst strength is ≥2.5kPa, which ensures that the paper has a certain pressure resistance, and the basis weight is controlled at 250 to 350g / m 2, the weight range can make the paper maintain appropriate thickness and strength when burning, the fiber length is 1.5-2.5mm, the fiber length in this length interval can interweave to form a stable structure, the beating degree is 30-40°SR, this index can make the fiber obtain appropriate degree of fanning, so that the paper can uniformly absorb the solvent when immersed in potassium acetate solution and ensure the stability during burning.

[0038] The burning rate of slow-burning paper when ignited is controlled at 2-5mm / min, which makes the paper continue to burn stably for 8-12 minutes, meeting the use requirements of long-time fragrance diffusion, the smoke transmittance during burning is ≥90%, which is directly manifested as no visible black smoke, the benzo(a)pyrene content in the smoke generated during burning is ≤0.08μg / m 3 , the carbon monoxide concentration is ≤40ppm, and the formaldehyde concentration is ≤0.05mg / m 3 , each index is strictly controlled within the safe range, the burning ash is gray-white, the benzo(a)pyrene content in the smoke generated during burning of the slow-burning paper is ≤0.1μg / m 3 , the carbon monoxide concentration is ≤50ppm;

[0039] The slow-burning paper does not produce a large amount of open fire when ignited. For example, taking the experimental sample as an example, a 300g thick paperboard with a size of 40mm×26mm can slowly burn along the fibers of the paper after igniting a small edge, and the whole burning process takes about 10 minutes, during which no black smoke is generated, only a small amount of ash is generated, and the smell emitted and the smoke generated during ignition both meet the detection standards of SGS; as a new type of material medium for household fragrance products such as extension line incense, aromatherapy candle, ultrasonic water agent fragrance diffuser, and waterless aromatherapy, the slow-burning paper fully utilizes the characteristics of paper, can make exquisite printing effects on the surface, and can be processed into different shapes according to requirements. Compared with the above-mentioned traditional household fragrance products, it has the outstanding advantage of being more convenient to carry, and can easily meet the use requirements of users in different scenes.

[0040] A processing method of a slow-burning paper formula, the processing method comprising the following steps:

[0041] S1: preparation of potassium carbonate aqueous solution

[0042] The weight percentage of 5-6% and purity ≥ 99%, particle size ≤ 100 of potassium carbonate is added to 70%-80% of distilled water, and the stirrer is continuously stirred at 150-200 rpm, and the hydrolysis reaction is carried out at an ambient temperature of 20-30°C, and the reaction time is controlled for 10-15 minutes, and the solution pH is monitored in real time by pH test paper or acidimeter during the period, until the solution pH reaches 9-10, and a uniform and stable potassium carbonate aqueous solution is formed for standby, and in this process, the high purity and suitable particle size of potassium carbonate can ensure its full dissolution in distilled water, and the hydrolysis reaction can enhance the alkalinity of the aqueous solution, and provide a suitable alkaline environment for the subsequent mixing reaction with potassium ethoxide solution, and the precisely controlled temperature and time can ensure that the hydrolysis reaction is fully carried out, and avoid affecting the quality of the subsequent solution due to incomplete reaction or overreaction.

[0043] S2: Preparation of potassium ethoxide solution

[0044] In the reaction kettle, 0.5-1% of potassium hydroxide by weight percentage is slowly added to 13-23% of 95%-99.7% volume concentration anhydrous ethanol with impurity content ≤ 0.3%, the stirring device of the reaction kettle is started, the mixing speed is controlled at 200-300 rpm, and the reaction temperature is maintained at 65-75°C by heating, and the mixture is continuously mixed for 12-18 minutes, until the potassium hydroxide is completely dissolved and fully reacted with ethanol, and a uniform and transparent potassium ethoxide solution is prepared for standby, and the batch addition of potassium hydroxide can avoid excessive reaction of the solution, and the precisely controlled temperature range can promote the esterification reaction of ethanol and potassium hydroxide to proceed efficiently, and reduce the volatilization loss of ethanol, and the set mixing speed and time can ensure that the materials are fully contacted, so that the reaction system reaches a uniform and stable state, and lays a foundation for the subsequent mixing reaction with potassium carbonate aqueous solution.

[0045] S3: Mixing the potassium carbonate aqueous solution of S1 with the potassium ethoxide solution of S2 to generate potassium acetate solution by oxidation reaction under alkaline conditions, specifically, the potassium carbonate aqueous solution prepared in S1 is slowly poured in, and the potassium ethoxide solution prepared in S2 is added in portions, the stirring device is started to continuously stir the mixture at a speed of 250-350 rpm, and the reaction temperature is maintained at 50-60°C by a constant temperature heating system, and during the reaction, the solution pH is monitored in real time, and when the pH deviates from the range of 10.5-11.5, potassium carbonate solution or potassium hydroxide solution is added dropwise for adjustment, to ensure that the reaction is carried out in a suitable alkaline environment, and the reaction is continued for 1.2-1.8 hours until the reaction is complete; in this process, the controlled stirring speed can ensure that the two solutions are fully mixed and contacted, the suitable reaction temperature can promote the oxidation reaction rate and avoid ethanol volatilization, the strictly controlled pH range is the condition for the generation of potassium acetate, and sufficient reaction time can ensure that the raw materials are fully converted, so that a high-purity potassium acetate solution is obtained, which provides a high-quality solvent for the subsequent preparation of slow-burning paper.

[0046] S4: The potassium acetate solution is transferred into a sealed stainless steel tank and left to stand for 24-48 hours at 20-25°C. The aging is terminated when the solution transmittance is ≥ 90%, and a potassium ion-containing potassium acetate aqueous solvent is obtained;

[0047] Further, funnel and filter screen are used for filtering during the transfer process to avoid impurities from being mixed in. The sealed stainless steel tank needs to be cleaned and dried in advance to prevent external pollutants from affecting the properties of the solution. The temperature is kept stable during the standing period, and the temperature is monitored and adjusted in real time through a temperature control system to ensure that the fluctuation is not more than ± 1°C within the range of 20-25°C. This temperature range can make the substances that have not completely reacted in the solution fully recombine, and also promote the uniform distribution of potassium ions. The solution is detected every 12 hours using a transmittance detector. When the transmittance is above 90%, it indicates that the macromolecular impurities in the solution have been fully precipitated or completely reacted. At this time, the aging is terminated, and the potassium ion concentration in the obtained potassium acetate aqueous solvent is uniform, which can effectively ensure the consistency of the absorption of the solvent by the pure wood pulp paper during the subsequent soaking process, and lay a foundation for the stable combustion performance of the slow-burning paper.

[0048] S5: The pure wood pulp paper is soaked in the potassium acetate aqueous solvent for 30 minutes, and then dried to obtain the finished slow-burning paper. The specific operation is as follows: the pure wood pulp paper is placed flat in the soaking tank containing the potassium acetate aqueous solvent at room temperature, and the stirring device is started to continuously stir the solution at a speed of 100-150 rpm to ensure that the paper is uniformly contacted with the solvent. The temperature of the solution is maintained at 20-25°C during the soaking process to avoid affecting the potassium ion penetration effect due to temperature fluctuations. After the soaking is completed, the paper is taken out and drained of excess solvent, and then transferred into a hot air drying equipment for three-stage drying: first, pre-drying at a temperature of 50-55°C for 2 minutes to reduce the water content of the paper to 25% and preliminarily remove the free water on the surface; then main drying at a temperature of 60-65°C for 3 minutes to further reduce the water content to 12% and reduce the adsorbed water between fibers; finally, fine drying at a temperature of 68-70°C for 1 minute to reduce the water content to ≤ 8% to ensure that the paper is evenly dried and the fiber structure is not damaged. During this process, the stirring and soaking can make the potassium ions in the potassium acetate aqueous solvent fully penetrate into the interior of the paper fibers, and the three-stage drying process avoids deformation of the paper due to sudden temperature changes through gradient heating, while ensuring that the residual amount of the solvent is minimized.

[0049] Specifically, the slow-burning effect is realized based on the catalysis of potassium ions. When the slow-burning paper is ignited, the potassium ions reduce the decomposition activation energy of the paper fibers, so that the oxidation reaction can continue under lower energy conditions, and the paper fibers are fully oxidized, so that a stable burning rate of 2-5 mm / min is achieved. The reason why it does not produce black smoke is that potassium acetate inhibits the generation of incomplete combustion products such as carbon monoxide, alcohols, aldehydes, and tar during the combustion process, reduces the formation of carbon particles and tar residues, and at the same time, the potassium ions are converted into potassium carbonate after combustion, making the ash appear gray-white, completely replacing the nitrogen oxide pollution problem that may be caused by traditional potassium nitrate and nitre combustion aids.

[0050] Further, the slow-burning paper can be processed after drying and forming. Patterns can be printed on the surface of the paper by intaglio printing process. The printing ink is an environmentally friendly water-based ink, and the adhesion after drying is ≥3 N / 10 mm. When adding spices, the pure natural essential oil (such as lavender essential oil, tea tree essential oil) can be attached to the surface of the paper by spraying or soaking, which can give the slow-burning paper the functions of sleep aid and bacteriostasis according to its own efficacy. Other synthetic spices are mainly used for space odor removal or basic fragrance expansion, and the addition amount is controlled at 0.5%-5% of the weight of the paper, which can ensure the aroma release intensity and does not affect the paper burning performance. The processed slow-burning paper can be cut into sheet, roll or special-shaped structure according to the needs to meet the use requirements of different scenes.

[0051] It should be noted that in addition to the above paper coating method, a paper pulp adding method can be used. In the paper pulp, potassium acetate aqueous solvent can also be used to make slow-burning paper. In the pure wood pulp paper pulp beating stage, 15% of the potassium acetate aqueous solvent is added according to the weight of the paper pulp, and after mixing uniformly, the paper is made, and the subsequent drying process is the same as S5. The difference is that the potassium ion distribution uniformity of the paper fiber made by the paper pulp adding method is poor, the burning rate fluctuation range is 3-7 mm / min, and the smoke transmittance is 80%-85%. Because the solvent and the fiber are not fully combined in the paper pulp stage, the potassium ion concentration in some areas is insufficient, leading to incomplete combustion. The paper burning rate made by the paper coating method is stable at 2-5 mm / min, and the smoke transmittance is ≥90%. Because the soaking process makes the potassium ion penetration more uniform, the catalytic effect is consistent.

[0052] For example, using a traditional formula (10% potassium nitrate, 5% ethanol, and 85% distilled water) to treat pure wood pulp paper under the same combustion conditions as the present application will produce obvious black smoke, the benzopyrene content in the smoke is 0.3 μg / m 3 , the carbon monoxide concentration is 120 ppm, the ash is gray-black, the pH value is 4.5-5.0 (acidic), and the nitrogen oxide odor is released. The slow-burning paper in the present application does not produce visible black smoke, the benzopyrene content is ≤0.08 μg / m 3Carbon monoxide ≤ 40 ppm, ash color is ash white, pH value is 7.0-8.5 (neutral to alkaline), and there is no irritating smell.

[0053] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A slow burning paper formula, characterized by: The raw materials include the following weight percentages: 70% to 80% distilled water, 5% to 6% potassium carbonate, 0.5% to 1% potassium hydroxide, 13% to 23% ethanol, and pure wood pulp paper as the base material; The purity of the potassium carbonate is ≥99% and the particle size is ≤100 meshes. The potassium hydroxide is a flaky solid with a solubility of ≥110g / 100g water at 20°C. The ethanol is anhydrous ethanol with a volume concentration of 95% to 99.7% and an impurity content of ≤0.3%.

2. A slow burning paper formula according to claim 1, characterized in that: Pure wood pulp paper is made of 100% softwood pulp or hardwood pulp, with a tear strength of ≥800mN, a bursting strength of ≥2.5kPa, and a basis weight of 250-350g / m 2 , fiber length is 1.5~2.5mm, and beating degree is 30~40°SR.

3. A slow burning paper formula according to claim 2, characterized in that: The burning rate of the slow burning paper when ignited is 2-5 mm / min, the smoke transmittance during the burning process is ≥90%, no visible black smoke is present, and the benzopyrene content in the smoke is ≤0.08 μg / m 3 , carbon monoxide concentration ≤40ppm, formaldehyde concentration ≤0.05mg / m 3 , the burning ashes are grayish white.

4. The slow burning paper formulation according to claim 3, characterized in that: The benzopyrene content in the smoke generated when the slow burning paper burns is ≤0.1 μg / m 3 , carbon monoxide concentration ≤50ppm.

5. A method for processing a slow burning paper formulation according to any one of claims 1 to 4, characterized in that: The processing method comprises the following steps: S1: Preparation of potassium carbonate aqueous solution Add 5-6% potassium carbonate to 70-80% distilled water to increase the alkalinity of the aqueous solution through hydrolysis reaction to prepare a potassium carbonate aqueous solution for use; S2: Preparation of potassium ethoxide solution In a reaction kettle, 0.5-1% potassium hydroxide is added to 13-23% ethanol in batches, and the mixture is heated and mixed to prepare a potassium ethanolate solution for later use; S3: mixing the potassium carbonate aqueous solution of S1 with the potassium ethoxide solution of S2, and generating a potassium acetate solution through an oxidation reaction under alkaline conditions; S4: The potassium acetate solution is transferred to a sealed stainless steel tank and allowed to stand at 20-25° C. for 24-48 hours. When the solution transmittance is ≥90%, aging is terminated to obtain a potassium acetate aqueous solvent containing potassium ions; S5: Soaking the pure wood pulp paper in the potassium acetate aqueous solvent for 30 minutes, taking it out and drying it to obtain a finished slow-burning paper.

6. The method for processing a slow burning paper formulation according to claim 5, characterized in that: In S1, the temperature of the hydrolysis reaction is 20-30°C, and the reaction time is 10-15 minutes, until the pH value of the solution reaches 9-10.

7. The method for processing a slow burning paper formulation according to claim 5, characterized in that: In S2, the temperature of the heating and mixing is 65-75°C, the mixing time is 12-18 minutes, and the mixing speed is 200-300 rpm.

8. The method for processing a slow burning paper formulation according to claim 5, characterized in that: In S3, the oxidation reaction is carried out under stirring conditions, the stirring speed is 250-350 rpm, the reaction temperature is 50-60°C, the pH value of the oxidation reaction is controlled at 10.5-11.5 by adding potassium carbonate or potassium hydroxide solution, and the reaction time is 1.2-1.8 hours.

9. The method for processing a slow burning paper formulation according to claim 5, characterized in that: In S5, the soaking process is carried out at room temperature. The solution is stirred during soaking at a stirring speed of 100-150 rpm. The drying method is hot air drying, which is divided into three stages: Pre-dry at 50-55℃ for 2 minutes to reduce the moisture content of the paper to 25%; Main drying at 60-65℃ for 3 minutes to reduce the moisture content of the paper to 12%; Fine drying at 68-70℃ for 1 minute to make the moisture content of paper ≤8%.

Images