Surface deodorant as well as preparation method and application thereof

Abstract

The invention provides a surface deodorant as well as a preparation method and application thereof. The deodorant is prepared from the following components in percentage by mass: 0.5 to 6 percent of composite deodorant main agent, 0.5 to 3 percent of organic acid, 0.05 to 1 percent of natural plant extract, 0.1 to 0.5 percent of water-soluble zinc salt and the balance of deionized water, the composite deodorizing main agent is composed of any two components of a nonionic surfactant, a water-soluble high-molecular polymer, cyclodextrin or a derivative thereof, and a porous inorganic adsorption material. The preparation method comprises the following steps: dissolving the natural plant extract and the water-soluble zinc salt in part of the deionized water while stirring, then adding the composite deodorizing main agent and the balance of the deionized water, uniformly stirring at 55-65 DEG C, and finally adding the organic acid to adjust the pH value to 5.0-6.0. The deodorant is used for removing the peculiar smell of the bamboo pulp natural color living base paper. A plurality of functional components cooperate to improve the odor removal efficiency; a post-treatment mode is adopted to remove odor, the existing papermaking main process flow does not need to be changed, the operation is simple and convenient, and the investment cost is low; an electronic nose is introduced for objective quantitative analysis, and a reliable basis is provided for product quality control.

Description

Technical Field

[0001] This invention relates to the field of papermaking and environmentally friendly functional chemicals, specifically to a surface deodorizer, its preparation method, and its application. Background Technology

[0002] Bamboo fiber, as a high-quality and sustainable papermaking raw material, is increasingly widely used. However, compared to traditional wood pulp, unbleached household paper made from fresh bamboo often has a unique and relatively strong bamboo pulp odor. This odor originates from volatile organic compounds (such as terpenes, aldehydes, and lower fatty acids) contained in bamboo itself, as well as certain small molecules produced during the pulping process. Although some consumers consider this odor a symbol of naturalness and health, a large number of consumers still prefer to use odorless everyday paper. The presence of this odor limits the market acceptance and added value of bamboo pulp paper.

[0003] Existing technologies propose improving the paper-using experience by adding deodorizing agents composed of natural substances during the pulping or bleaching process. For example, Chinese patent CN111139687A discloses a method for preparing environmentally friendly antibacterial household paper, including the following steps: material preparation, pulping and mixing of materials, primary product formation, and finished product packaging; wherein, the "pulping and mixing of materials" step includes mixing and preheating waste bamboo leaves, broad-leaved wood and coniferous wood, pulping them until the freeness is 45-53°SR, obtaining primary pulp, and then adding the bactericide, toughening agent and deodorizing agent to the primary pulp one by one, and mixing and stirring evenly to obtain primary mixed wood pulp; the deodorizing agent includes the following raw materials by weight: 1-3 parts of coconut charcoal, 1-3 parts of natural aromatic oil, and 1-3 parts of wild plant extract essential oil. However, this patent adds coconut fiber charcoal as a deodorizing agent to the pulp used in the preparation of household paper. Since coconut fiber charcoal is a solid particle, it may cause uneven dispersion of the pulp and local aggregation during the paper forming process, resulting in problems such as color spots, uneven thickness, or reduced strength of the paper. Furthermore, natural aromatic oils and essential oils extracted from wild plants have strong volatility and will gradually evaporate over time, resulting in insufficient persistence and failing to truly solve the odor problem of bamboo pulp base paper.

[0004] Therefore, how to effectively remove the odor from bamboo pulp base paper without affecting the paper's performance has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of the above problems, the present invention provides a surface deodorizer, its preparation method and application, which can effectively remove the odor of bamboo pulp base paper without affecting the paper performance.

[0006] The technical solution adopted by this invention to solve its technical problem is:

[0007] The first aspect of the present invention provides a surface deodorizing agent, characterized in that, by mass percentage, it comprises the following components: 0.5% to 6% of a composite deodorizing agent, 0.5% to 3% of an organic acid, 0.05% to 1% of a natural plant extract, 0.1% to 0.5% of a water-soluble zinc salt, and the balance being deionized water; wherein the composite deodorizing agent is composed of any two components selected from nonionic surfactants, water-soluble polymers, cyclodextrins or their derivatives, and porous inorganic adsorbent materials, in a mass ratio of 1:1.

[0008] In the composite deodorizing agent, nonionic surfactants encapsulate hydrophobic odor molecules into micelles through solubilization; water-soluble polymers adsorb or entangle odor molecules through polar groups on their molecular chains; cyclodextrins or their derivatives encapsulate odor molecules through unique hydrophobic cavities; and porous inorganic adsorbent materials adsorb odor molecules through their large specific surface area and porous structure. This invention achieves a synergistic effect through the combination of multiple functional components in the composite deodorizing agent, resulting in a more comprehensive and efficient removal of complex volatile organic compounds from bamboo pulp odors. Furthermore, organic acids are used to adjust the system pH to slightly acidic (pH=5.0~6.0), neutralizing some alkaline odor components and synergizing with the composite deodorizing agent. Natural plant extracts can assist in regulating odor perception while providing a certain degree of antibacterial protection. Trace amounts of zinc ions in water-soluble zinc salts can inhibit microbial growth and prevent secondary odors from developing during storage.

[0009] Furthermore, the nonionic surfactant is selected from at least one of Tween-20 and Tween-80.

[0010] Furthermore, the water-soluble polymer is selected from at least one of polyvinylpyrrolidone, hydroxypropyl methylcellulose, and modified starch.

[0011] Furthermore, the cyclodextrin or its derivative is selected from at least one of hydroxypropyl-β-cyclodextrin and β-cyclodextrin.

[0012] Furthermore, the porous inorganic adsorbent material is selected from at least one of food-grade diatomaceous earth and fumed silica.

[0013] Furthermore, the organic acid is citric acid or tartaric acid.

[0014] Furthermore, the natural plant extract is aloe vera extract or tea polyphenols.

[0015] Furthermore, the water-soluble zinc salt is selected from at least one of zinc gluconate, zinc lactate, zinc amino acid, and zinc sulfate.

[0016] A second aspect of the present invention provides a method for preparing a surface deodorizing agent, comprising the following steps:

[0017] S1. Under stirring conditions, the natural plant extract and water-soluble zinc salt are dissolved in a portion of deionized water to form a first solution; wherein the amount of the deionized water is 30% to 50% of the total deionized water mass;

[0018] S2. Add the composite deodorizing agent to the first solution, add the remaining deionized water, and stir continuously at 55~65℃ until the system is evenly dispersed;

[0019] S3. Add the organic acid to the dispersion system obtained in step S2, and adjust the pH value of the system to 5.0~6.0 to obtain a surface deodorizer.

[0020] A third aspect of the present invention provides an application of a surface deodorizer in removing odors from unbleached bamboo pulp base paper, wherein the surface deodorizer is applied to the surface of the unbleached bamboo pulp base paper by spraying and then dried at a temperature of 55-65°C; wherein the amount of the surface deodorizer used is 10%-50% of the mass of the unbleached bamboo pulp base paper.

[0021] This invention also provides a method for evaluating the deodorization effect of a surface deodorizer in removing the odor from bamboo pulp-based household paper. The method uses an electronic nose to objectively and quantitatively evaluate the deodorization effect, and includes the following steps:

[0022] (1) Sample preparation: Odorless household paper was selected as the reference sample, and bamboo pulp unbleached household paper treated with the surface deodorizing agent was used as the test sample.

[0023] (2) Signal acquisition: The odor characteristic signals of the reference sample and the test sample are acquired using an electronic nose;

[0024] (3) Data processing: Analyze the odor feature signals and calculate the odor similarity index (S) or Euclidean distance (ED) between the test sample and the reference sample.

[0025] (4) Effect judgment: Evaluate the S value and ED value. If the calculated S ≥ 85% or ED ≤ 5.0, the deodorization effect of the bamboo pulp natural color household paper is judged to meet the standard.

[0026] This invention abandons the traditional method of evaluating odor removal effectiveness through subjective smelling. Instead, it employs an electronic nose for objective testing. A commercially available, odorless wood pulp household paper, confirmed by an authoritative olfactory evaluation panel, serves as the baseline sample. Bamboo pulp household paper treated with a surface deodorizer is used as the test sample. Both the baseline and test samples are tested with the electronic nose under identical conditions. The odor removal effect of the surface deodorizer is then quantified by comparing the odor similarity index (S) or Euclidean distance (ED) on the odor characteristic spectrum between the baseline and test samples. Generally, an odor similarity index (S) of 85% or higher, or an Euclidean distance (ED) of less than 5.0, is considered to meet the commercially odorless requirement.

[0027] This invention also provides an application of a surface deodorizer in removing odors from finished cream-coated paper products. The surface deodorizer is compounded with cream and then applied to the paper surface. During the production of cream-coated paper products, the cream can trigger the bamboo pulp smell in the base paper. This invention uses a surface deodorizer compounded with cream to remove the odor from the finished cream-coated paper products.

[0028] Compared with the prior art, the technical solution of this application has at least the following beneficial effects:

[0029] The surface deodorizer provided by this invention achieves a synergistic effect through the scientific compounding of multiple functional components, significantly improving deodorization efficiency and durability. The composite deodorizing main agent can be composed of two components with different mechanisms, offering diverse choices. This not only broadens the range of raw material selection but also further enhances the odor removal effect and system stability through multi-mechanism synergy, thereby expanding the applicable scenarios and performance limits of the deodorizer. In terms of application, this invention uses a post-treatment method to deodorize bamboo pulp unbleached base paper or cream paper products without altering the existing papermaking process. It boasts strong process adaptability, is easy to integrate into production lines, and offers advantages such as simple operation and low investment costs. Furthermore, this invention introduces an electronic nose for objective quantitative analysis when evaluating the deodorization effect, freeing the deodorization effect from traditional subjective descriptions and providing measurable, comparable, and highly persuasive scientific evidence for product quality control. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0031] The term "comprising" as used in this application is an open-ended inclusion, meaning "including but not limited to". The term "according to" means "at least in part according to". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment". Definitions of other terms will be given in the description below.

[0032] Example 1

[0033] The first aspect of this invention provides a surface deodorizer, which, by mass percentage, consists of the following components: 0.5% of a compound deodorizing agent, 0.5% of citric acid, 0.05% of aloe vera extract, 0.1% of zinc gluconate, and the balance being deionized water; wherein the compound deodorizing agent is composed of Tween-80 and polyvinylpyrrolidone (PVP) in a mass ratio of 1:1.

[0034] A second aspect of this invention provides a method for preparing a surface deodorizing agent, comprising the following steps:

[0035] S1. Under stirring conditions, aloe vera extract and zinc gluconate are dissolved in a portion of deionized water, and stirring is started at a speed of 300 rpm to form a first solution; wherein, the amount of the portion of deionized water used is 30% of the total deionized water mass;

[0036] S2. Add the compound deodorizing agent to the first solution, add the remaining deionized water, and stir continuously in a 55°C water bath until the system is evenly dispersed.

[0037] S3. Add citric acid to the dispersion system obtained in step S2 and adjust the pH value of the system to 5.0 to obtain a surface deodorizer.

[0038] The third aspect of the present invention provides an application of a surface deodorizer in removing odors from bamboo pulp natural color household paper. The surface deodorizer is applied to the surface of the bamboo pulp natural color household paper by spraying and then dried at a temperature of 55°C. The amount of surface deodorizer used is 50% of the mass of the bamboo pulp natural color household paper.

[0039] Example 2

[0040] The first aspect of this invention provides a surface deodorizing agent, which, by mass percentage, consists of the following components: 2% of a compound deodorizing agent, 2% of tartaric acid, 0.5% of tea polyphenols, 0.3% of zinc lactate, and the balance being deionized water; wherein the compound deodorizing agent is composed of Tween-20 and hydroxypropyl methylcellulose in a mass ratio of 1:1.

[0041] A second aspect of this invention provides a method for preparing a surface deodorizing agent, comprising the following steps:

[0042] S1. Under stirring conditions, tea polyphenols and zinc lactate are dissolved in a portion of deionized water, and stirring is started at a speed of 300 rpm to form a first solution; wherein, the amount of the portion of deionized water used is 40% of the total mass of deionized water;

[0043] S2. Add the compound deodorizing agent to the first solution, add the remaining deionized water, and stir continuously in a 60°C water bath until the system is evenly dispersed;

[0044] S3. Add tartaric acid to the dispersion system obtained in step S2 and adjust the pH value of the system to 5.5 to obtain a surface deodorizer.

[0045] The third aspect of the present invention provides an application of a surface deodorizer in removing odors from bamboo pulp natural color household paper. The surface deodorizer is applied to the surface of the bamboo pulp natural color household paper by spraying, and then dried at a temperature of 60°C. The amount of surface deodorizer used is 30% of the mass of the bamboo pulp natural color household paper.

[0046] Example 3

[0047] The first aspect of this invention provides a surface deodorizing agent, which, by mass percentage, is composed of the following components: 6% of a compound deodorizing agent, 3% of citric acid, 1% of aloe vera extract, 0.5% of zinc amino acids, and the balance being deionized water; wherein the compound deodorizing agent is composed of modified starch and hydroxypropyl-β-cyclodextrin in a mass ratio of 1:1.

[0048] A second aspect of this invention provides a method for preparing a surface deodorizing agent, comprising the following steps:

[0049] S1. Under stirring conditions, aloe vera extract and zinc amino acids are dissolved in a portion of deionized water, and stirring is started at a speed of 300 rpm to form a first solution; wherein, the amount of the portion of deionized water used is 50% of the total deionized water mass;

[0050] S2. Add the compound deodorizing agent to the first solution, add the remaining deionized water, and stir continuously in a 65°C water bath until the system is evenly dispersed.

[0051] S3. Add citric acid to the dispersion system obtained in step S2 and adjust the pH value of the system to 6.0 to obtain a surface deodorizer.

[0052] The third aspect of the present invention provides an application of a surface deodorizer in removing odors from bamboo pulp natural color household paper. The surface deodorizer is applied to the surface of the bamboo pulp natural color household paper by spraying, and then dried at a temperature of 65°C. The amount of surface deodorizer used is 10% of the mass of the bamboo pulp natural color household paper.

[0053] Example 4

[0054] The first aspect of this invention provides a surface deodorizing agent, which, by mass percentage, consists of the following components: 2% of a compound deodorizing agent, 2% of citric acid, 0.5% of aloe vera extract, 0.3% of zinc sulfate, and the balance being deionized water; wherein the compound deodorizing agent is composed of β-cyclodextrin and food-grade diatomaceous earth in a mass ratio of 1:1.

[0055] A second aspect of this invention provides a method for preparing a surface deodorizing agent, comprising the following steps:

[0056] S1. Under stirring conditions, aloe vera extract and zinc sulfate are dissolved in a portion of deionized water, and stirring is started at a speed of 300 rpm to form a first solution; wherein, the amount of the portion of deionized water used is 40% of the total deionized water mass;

[0057] S2. Add the compound deodorizing agent to the first solution, add the remaining deionized water, and stir continuously in a 65°C water bath until the system is evenly dispersed.

[0058] S3. Add citric acid to the dispersion system obtained in step S2 and adjust the pH value of the system to 5.5 to obtain a surface deodorizer.

[0059] The third aspect of the present invention provides an application of a surface deodorizer in removing odors from bamboo pulp natural color household paper. The surface deodorizer is applied to the surface of the bamboo pulp natural color household paper by spraying, and then dried at a temperature of 65°C. The amount of surface deodorizer used is 30% of the mass of the bamboo pulp natural color household paper.

[0060] Example 5

[0061] The first aspect of this invention provides a surface deodorizing agent, which, by mass percentage, is composed of the following components: 2% of a composite deodorizing agent, 2% of citric acid, 0.5% of aloe vera extract, 0.3% of zinc gluconate, and the balance being deionized water; wherein the composite deodorizing agent is composed of Tween-80 and fumed silica in a mass ratio of 1:1.

[0062] A second aspect of this invention provides a method for preparing a surface deodorizing agent, comprising the following steps:

[0063] S1. Under stirring conditions, aloe vera extract and zinc gluconate are dissolved in a portion of deionized water, and stirring is started at a speed of 300 rpm to form a first solution; wherein, the amount of the portion of deionized water used is 40% of the total deionized water mass;

[0064] S2. Add the compound deodorizing agent to the first solution, add the remaining deionized water, and stir continuously in a 65°C water bath until the system is evenly dispersed.

[0065] S3. Add citric acid to the dispersion system obtained in step S2 and adjust the pH value of the system to 5.5 to obtain a surface deodorizer.

[0066] The third aspect of the present invention provides an application of a surface deodorizer in removing odors from bamboo pulp natural color household paper. The surface deodorizer is applied to the surface of the bamboo pulp natural color household paper by spraying, and then dried at a temperature of 65°C. The amount of surface deodorizer used is 30% of the mass of the bamboo pulp natural color household paper.

[0067] Example 6

[0068] The first aspect of this invention provides a surface deodorizing agent, which, by mass percentage, consists of the following components: 3% of a compound deodorizing agent, 1.5% of citric acid, 0.5% of aloe vera extract, 0.2% of zinc gluconate, and the balance being deionized water; wherein the compound deodorizing agent is composed of Tween-20 and β-cyclodextrin in a mass ratio of 1:1.

[0069] A second aspect of this invention provides a method for preparing a surface deodorizing agent, comprising the following steps:

[0070] S1. Under stirring conditions, aloe vera extract and zinc gluconate are dissolved in a portion of deionized water, and stirring is started at a speed of 300 rpm to form a first solution; wherein, the amount of the portion of deionized water used is 40% of the total deionized water mass;

[0071] S2. Add the compound deodorizing agent to the first solution, add the remaining deionized water, and stir continuously in a 65°C water bath until the system is evenly dispersed.

[0072] S3. Add citric acid to the dispersion system obtained in step S2 and adjust the pH value of the system to 5.5 to obtain a surface deodorizer.

[0073] The third aspect of the present invention provides an application of a surface deodorizer in removing odors from bamboo pulp natural color household paper. The surface deodorizer is applied to the surface of the bamboo pulp natural color household paper by spraying, and then dried at a temperature of 65°C. The amount of surface deodorizer used is 30% of the mass of the bamboo pulp natural color household paper.

[0074] Example 7

[0075] The first aspect of this invention provides a surface deodorizing agent, which, by mass percentage, consists of the following components: 3% of a compound deodorizing agent, 1.5% of citric acid, 0.5% of aloe vera extract, 0.2% of zinc gluconate, and the balance being deionized water; wherein the compound deodorizing agent is composed of polyvinylpyrrolidone (PVP) and hydroxypropyl-β-cyclodextrin in a mass ratio of 1:1.

[0076] A second aspect of this invention provides a method for preparing a surface deodorizing agent, comprising the following steps:

[0077] S1. Under stirring conditions, aloe vera extract and zinc gluconate are dissolved in a portion of deionized water, and stirring is started at a speed of 300 rpm to form a first solution; wherein, the amount of the portion of deionized water used is 40% of the total deionized water mass;

[0078] S2. Add the compound deodorizing agent to the first solution, add the remaining deionized water, and stir continuously in a 65°C water bath until the system is evenly dispersed.

[0079] S3. Add citric acid to the dispersion system obtained in step S2 and adjust the pH value of the system to 5.5 to obtain a surface deodorizer.

[0080] The third aspect of the present invention provides an application of a surface deodorizer in removing odors from bamboo pulp natural color household paper. The surface deodorizer is applied to the surface of the bamboo pulp natural color household paper by spraying, and then dried at a temperature of 65°C. The amount of surface deodorizer used is 30% of the mass of the bamboo pulp natural color household paper.

[0081] Comparative Example 1

[0082] The main deodorizing agent used was Tween-80 with a mass fraction of 2%, and the other experimental conditions were the same as in Example 1.

[0083] Comparative Example 2

[0084] The main deodorizing agent used was polyvinylpyrrolidone (PVP) with a mass fraction of 2%, and the other experimental conditions were the same as in Example 1.

[0085] Performance Evaluation: This invention also provides a method for evaluating the deodorizing effect of a surface deodorizer in removing the odor from unbleached bamboo pulp base paper. The surface deodorizers obtained in Examples 1-6 and Comparative Examples 1-2 are sprayed onto the surface of the unbleached bamboo pulp base paper. The amount of surface deodorizer used is 30% of the mass of the unbleached bamboo pulp base paper. Odor analysis and objective quantitative evaluation are performed using electronic nose technology, and the results are compared with untreated bamboo pulp base paper and commercially available odorless reference samples. The specific steps include:

[0086] (1) Sample preparation:

[0087] Preparation of reference samples: Commercially available mainstream brands of pure wood pulp household paper that has been confirmed to be odorless were selected as reference samples (R);

[0088] Sample preparation: Take 100% fresh bamboo pulp unbleached household paper from the same batch with a distinct bamboo pulp odor, cut it into 10cm×10cm standard samples, and spray them with the surface deodorizers prepared in Examples 1-7 and Comparative Examples 1-2, as well as deionized water. The spraying amount is strictly controlled at 30% of the mass of the standard sample. Then, dry the samples in a 60℃ oven for 30 minutes and place them in a constant temperature and humidity chamber at 23℃ and 50%RH (relative humidity) for 24 hours to equilibrate. Test samples treated with the surface deodorizers in Examples 1-6 (E1, E2, E3, E4, E5, E6, E7), test samples treated with the surface deodorizers in Comparative Examples 1-2 (D1, D2), and test samples treated with deionized water (E0) are obtained respectively.

[0089] (2) Signal acquisition:

[0090] The reference sample (R) and all test samples (E1-E7, D1-D2, E0) were sealed in dedicated 500mL sampling bottles. Each sample was prepared in triplicate. The headspace gas and sensor signal were collected sequentially using a PEN3 portable electronic nose (AIRSENSE, Germany) with 10 different metal oxide sensors. The odor characteristic signals of the reference sample (R) and all test samples (E1-E7, D1-D2, E0) were collected respectively.

[0091] The electronic nose test conditions were as follows: sample headspace generation temperature 40℃, incubation time 30 minutes, injection flow rate 400mL / min, data acquisition time 60 seconds, and the stable response value at the 55th second was taken as the characteristic data. Then, the response values ​​of the 10 sensors of the electronic nose were combined to form the odor characteristic signal of the sample.

[0092] (3) Data processing:

[0093] Principal component analysis (PCA) was used to reduce the dimensionality of the odor feature signals of the reference sample (R) and all test samples (E1-E7, D1-D2, E0) to obtain the odor fingerprints of the reference sample (R) and all test samples (E1-E7, D1-D2, E0). The Euclidean distance (ED) between the odor fingerprints of the test samples (E1-E7, D1-D2, E0) and the odor fingerprint of the reference sample (R) was calculated, as well as the odor similarity index (S) between the odor fingerprints of the test samples (E1-E7, D1-D2, E0) and the odor fingerprint of the reference sample (R) was calculated.

[0094] In this step, Euclidean distance (ED) is used to directly quantify the spatial difference in odor characteristics between two samples. The smaller the value, the closer the odors are. The odor similarity index (S) is obtained by the built-in algorithm of the electronic nose system (such as the inverse normalization of Euclidean distance or the proximity calculation with the reference sample in PCA space). The range is 0~100%. The higher the value, the more similar the odor of the sample is to the reference sample, that is, the better the deodorization effect.

[0095] (4) Effect judgment: Evaluate the S value and ED value. If the calculated S ≥ 85% or ED ≤ 5.0, the deodorization effect of the bamboo pulp natural color living paper is judged to meet the standard.

[0096] As shown in Table 1, the ED value of the blank control group (E0) was 15.9 and the S value was only 46.3%, while the ED values ​​of Examples 1-7 of this application were all ≤5.0 and the S values ​​were all ≥85%, which were significantly better than Comparative Examples 1-2 (surface deodorizers of single-component composite deodorizing agents). This proves that the combination of the two components of the composite deodorizing agent of this invention produced a synergistic deodorizing effect.

[0097] Among them, the combination of PVP and hydroxypropyl-β-cyclodextrin in a 1:1 ratio (E7) showed the most outstanding effect, with an odor similarity (S) as high as 96.1% and an Euclidean distance (ED) as low as 1.5, significantly better than other combinations (E1-E6). This may be due to the rapid adsorption and entanglement of polar odor molecules by water-soluble polymer PVP through hydrogen bonds and van der Waals forces, and the specific inclusion of non-polar odor molecules by hydroxypropyl-β-cyclodextrin through hydrophobic cavities. The two form a perfect adsorption-inclusion dual synergy in their mechanism of action, thus achieving more efficient and comprehensive removal of the complex odor mixture in bamboo pulp.

[0098] Therefore, this invention achieves a synergistic effect by scientifically compounding deodorizing components with different mechanisms of action (especially PVP and hydroxypropyl-β-cyclodextrin), resulting in a significantly superior deodorizing effect compared to any single-component compound deodorizing agent for surface deodorization. Furthermore, by optimizing the concentration of the compound deodorizing agent, an optimal balance between efficiency and cost has been found. This provides a novel, efficient, stable, and objectively evaluable solution for the post-treatment of odors in bamboo pulp-based household paper, possessing significant industrial application value.

[0099] Table 1. Specific conditions and performance evaluation of the surface deodorizing agent of the present invention.

[0100] Case Test sample Concentration of compound deodorizing agent ED of the reference sample S Blank control E0 Unprocessed 15.9 46.3% Example 1 E1 0.5% 4.8 84.7% Example 2 E2 2.0% 3.5 88.0% Example 3 E3 6.0% 2.5 92.0% Example 4 E4 2.0% 3.9 86.5% Example 5 E5 2.0% 4.2 85.0% Example 6 E6 3.0% 2.8 91.0% Example 7 E7 3.0% 1.5 96.1% Comparative Example 1 D1 2.0% 9.8 68.5% Comparative Example 2 D2 2.0% 8.4 72.1%

[0101] The embodiments described above are some, but not all, embodiments of the present invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A surface deodorizing agent, characterized in that, The product comprises, by mass percentage, the following components: 0.5% to 6% of a compound deodorizing agent, 0.5% to 3% of organic acids, 0.05% to 1% of natural plant extracts, 0.1% to 0.5% of water-soluble zinc salts, and the balance being deionized water; wherein the compound deodorizing agent is composed of any two components selected from nonionic surfactants, water-soluble polymers, cyclodextrins or their derivatives, and porous inorganic adsorbent materials, in a mass ratio of 1:

1.

2. The surface deodorizer according to claim 1, characterized in that, The nonionic surfactant is selected from at least one of Tween-20 and Tween-80.

3. The surface deodorizer according to claim 1, characterized in that, The water-soluble polymer is selected from at least one of polyvinylpyrrolidone, hydroxypropyl methylcellulose, and modified starch.

4. The surface deodorizer according to claim 1, characterized in that, The cyclodextrin or its derivatives are selected from at least one of hydroxypropyl-β-cyclodextrin and β-cyclodextrin.

5. The surface deodorizer according to claim 1, characterized in that, The porous inorganic adsorbent material is selected from at least one of food-grade diatomaceous earth and fumed silica.

6. The surface deodorizer according to claim 1, characterized in that, The organic acid is citric acid or tartaric acid.

7. The surface deodorizer according to claim 1, characterized in that, The natural plant extract is aloe vera extract or tea polyphenols.

8. The surface deodorizer according to claim 1, characterized in that, The water-soluble zinc salt is selected from at least one of zinc gluconate, zinc lactate, zinc amino acid, and zinc sulfate.

9. A method for preparing a surface deodorizing agent as described in any one of claims 1 to 8, characterized in that, Includes the following steps: S1. Under stirring conditions, the natural plant extract and water-soluble zinc salt are dissolved in a portion of deionized water to form a first solution; wherein the amount of the deionized water is 30% to 50% of the total deionized water mass; S2. Add the composite deodorizing agent to the first solution, add the remaining deionized water, and stir continuously at 55~65℃ until the system is evenly dispersed; S3. Add the organic acid to the dispersion system obtained in step S2, and adjust the pH value of the system to 5.0~6.0 to obtain a surface deodorizer.

10. The application of a surface deodorizer as described in any one of claims 1 to 8 in removing the odor from unbleached bamboo pulp household paper, characterized in that, The surface deodorizing agent is applied to the surface of bamboo pulp natural color household paper by spraying, and then dried at a temperature of 55~65℃; wherein, the amount of the surface deodorizing agent used is 10%~50% of the mass of the bamboo pulp natural color household paper.

11. The application of the surface deodorizer according to claim 10 in removing the odor from bamboo pulp-based household paper, characterized in that, An electronic nose is used to objectively and quantitatively evaluate the odor removal effect, including the following steps: (1) Sample preparation: Odorless household paper was selected as the reference sample, and bamboo pulp unbleached household paper treated with the surface deodorizing agent was used as the test sample. (2) Signal acquisition: The odor characteristic signals of the reference sample and the test sample are acquired using an electronic nose; (3) Data processing: Analyze the odor feature signals and calculate the odor similarity index (S) or Euclidean distance (ED) between the test sample and the reference sample. (4) Effect judgment: Evaluate the S value and ED value. If the calculated S ≥ 85% or ED ≤ 5.0, the deodorization effect of the bamboo pulp natural color household paper is judged to meet the standard.

12. The application of a surface deodorizer as described in any one of claims 1 to 8 in removing odors from finished cream paper products, characterized in that, The surface deodorizer is compounded with the cream and then applied to the paper surface.