Moisturizing component and simple evaluation method and application of moisturizing performance of paper finished product of moisturizing component

Abstract

The invention discloses a moisturizing component, a simple evaluation method for the moisturizing performance of a paper finished product thereof and application, and belongs to the technical field of papermaking chemicals and functional paper product detection. In order to solve the problems that the combination state of moisturizing components and paper fibers and the influence of the moisturizing components on the moisturizing performance of a finished product cannot be directly, simply and conveniently evaluated in the prior art, the invention provides a progressive evaluation method which comprises the following steps: firstly, determining the moisturizing performance of the moisturizing components; secondly, applying to paper to prepare a paper finished product, and measuring the actual moisture retention property; and finally, quantitatively evaluating the moisture retention effectiveness and combination state of the component on the paper through contrastive analysis. The method disclosed by the invention is simple and rapid, the limitation of only depending on macro performance evaluation is broken through, and key data support is provided for screening of moisturizing components and optimization of a paper finished product production process.

Description

Technical Field

[0001] This invention belongs to the field of papermaking chemicals and functional paper product testing technology, and specifically relates to a rapid, simple, and integrated evaluation method for simultaneously evaluating the inherent moisturizing efficacy of moisturizing ingredients and their moisturizing performance in actual paper products after being combined with paper. This method can guide the research and development of paper products containing moisturizing ingredients and provide data references for product quality control. Background Technology

[0002] With the upgrading of consumer demand, consumers have put forward higher requirements for the comfort and functionality of household paper products. As a type of functional paper with added moisturizing ingredients such as polyols and sodium hyaluronate, moisturizing paper has gradually stood out from traditional household paper products due to its excellent soft touch and long-lasting moisturizing performance, becoming an important choice in the fields of maternal and infant care, medical dressings and high-end personal care.

[0003] The core of achieving the function of moisturizing paper lies in efficiently and stably loading moisturizing ingredients onto paper fibers. However, the industry currently faces three major technical challenges in this field: First, insufficient environmental adaptability; existing solutions struggle to effectively lock in water under high temperature and low humidity conditions (high weight loss rate) or maintain stable water retention in low temperature and high humidity environments. Second, difficulty in maintaining ingredient effectiveness; this manifests as a low proportion of active ingredients, easy volatility or migration, resulting in low moisturizing efficiency and poor durability. Third, a balance between cost and performance; controlling raw material costs often comes at the expense of moisturizing efficacy and long-term stability. Therefore, developing a moisturizing solution that maintains high efficiency, stability, and cost-effectiveness under a wide range of environmental conditions has become an urgent need for the industry.

[0004] Currently, both industrial practice and academic research lack effective evaluation methods for optimizing the binding effect of moisturizing ingredients and fibers—a crucial aspect. Existing technologies mostly focus on macroscopic or indirect parameters such as the initial addition amount of moisturizing ingredients, paper physical strength, and microbial indicators, severely lacking an evaluation method that can directly, simply, and quantitatively characterize the binding state and effectiveness of "moisturizing ingredients-fibers" under actual process conditions. This lack of a method leads to a dilemma in production and R&D: to ensure functionality, there is a tendency to add excessive amounts, driving up costs; or to control costs, the addition is reduced, but this may result in poor binding and rapid decline in product functionality, damaging product reputation and market performance.

[0005] More systematically, there is currently a lack of a simple and rapid evaluation system that can effectively link the "performance of a single moisturizing component" to the "performance of the finished paper product after application," which means that the formulation screening and process optimization in the research and development process lack reliable and direct data guidance.

[0006] Therefore, there is an urgent need in this field for an innovative and simple evaluation method that can penetrate macroscopic performance appearances and directly and quantitatively reflect the binding state and efficacy of moisturizing components with paper fibers. This would provide key technical tools and data support for understanding and regulating the performance balance mechanism of moisturizing paper, thereby promoting the development and application of efficient, stable, and sustainable moisturizing paper products. To facilitate understanding of the overall concept of this invention, Figure 1 The core process of this progressive testing-based moisturizing performance evaluation method is illustrated using a flowchart. Summary of the Invention

[0007] In view of this, the present invention provides a simple evaluation method and application for moisturizing ingredients and their moisturizing properties in paper products. This method can provide key data references for process optimization and product quality control during the research and development of paper products containing moisturizing ingredients.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A simplified evaluation method and application for moisturizing ingredients and their moisturizing properties in finished paper products, characterized by comprising the following steps: (1) Evaluation of the performance of moisturizing ingredients: The moisturizing performance of the target moisturizing ingredients is measured to obtain their basic moisturizing data; (2) Paper product preparation and processing: The target moisturizing component is applied to the base paper using a predetermined process to prepare a paper product containing the moisturizing component; (3) Evaluation of the moisture retention of the paper product: The moisture retention performance of the paper product prepared in step (2) is measured to obtain the moisture retention data of the paper product; (4) Performance correlation and effectiveness analysis: The basic moisturizing data obtained in step (1) and the moisturizing data of the finished paper obtained in step (3) are compared and correlated to evaluate the moisturizing effectiveness of the target moisturizing component on the base paper.

[0009] Preferably, the determination of the moisturizing performance of the target moisturizing ingredient in step (1) specifically involves determining at least one of the moisture absorption rate, loss rate, or moisturizing rate of the moisturizing ingredient under a set temperature and humidity environment.

[0010] Preferably, in step (4), the evaluation of the moisturizing effect of the moisturizing component on the base paper specifically involves calculating at least one of the retention rate of the moisturizing component on the paper, the softness of the finished paper, or the overall feel; and evaluating the influence of the binding state of the target moisturizing component with the base paper on its moisturizing performance based on the retention rate of the moisturizing component, the softness of the finished paper, or the overall feel.

[0011] Preferably, the determination of the moisturizing performance of the target moisturizing ingredient in step (1) specifically involves determining the basic moisturizing data of the moisturizing ingredient under simulated actual use environment or accelerated aging or cyclic rehumidification test conditions.

[0012] Preferably, the predetermined process in step (2) is at least one of impregnation, coating, spraying or internal addition.

[0013] Preferably, in step (3), the paper product is tested for its moisture retention performance. Specifically, the moisture retention data of the paper product is measured under simulated actual use environment or accelerated aging or cyclic rehumidification test conditions.

[0014] The steps involve evaluating the moisturizing ingredients and their finished paper products using any of the methods described above, and then adjusting the process parameters accordingly.

[0015] As can be seen from the above technical solution, compared with the prior art, this invention discloses a simple evaluation method and application for moisturizing ingredients and their paper product moisturizing performance, which has the following beneficial effects: It is a complete solution that provides clear scientific guidance for the entire chain from moisturizing ingredient screening and base paper adaptation to process optimization. Based on the obtained evaluation results of the moisturizing effectiveness and binding state, predictions are provided when setting the amount of moisturizing ingredient added, ultimately achieving the core industrial goal of obtaining better and more stable overall moisturizing paper performance with lower amounts of moisturizing ingredients. The method has a universal principle and can be applied to different types of moisturizing ingredients and paper substrates. By adjusting the simulation liquid and test parameters, it can be flexibly applied to the evaluation of various functional paper products. Attached Figure Description

[0016] Figure 1 This is a flowchart of a method for evaluating moisturizing performance based on progressive testing.

[0017] Figure 2 Moisturizing ingredient C 1-1 and C 1-2 The graph shows the change in loss rate in a 60℃ electric heating forced-air drying oven.

[0018] Figure 3 The graph shows the changes in the loss rate of moisturizing ingredients H1 and H2 under conditions of 38℃ and 20%RH.

[0019] Figure 4 The graph shows the changes in the loss rate of moisturizing ingredients H1 and H2 in a vacuum oven at 40°C. Detailed Implementation

[0020] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] To better compare the key properties of moisturizing ingredients and their finished paper products, such as the loss rate and retention rate of moisturizing ingredients on paper, the moisturizing properties and effectiveness of the finished paper products, tests were conducted based on the number of layers and size of the finished moisturizing paper. Furthermore, for the same embodiment, samples were taken from each finished paper layer, with the number of layers and size assumed to be the same. The sample sizes were similar across all tests.

[0022] Example 1 (1) Evaluation of the performance of moisturizing ingredients: A moisturizing ingredient, labeled C 1-1 Take a sample and weigh it, and record the weight as m. 1-1 Then place them in a 60℃ electric heating drying oven for a period of time, remove them and place them in a desiccator to cool for 5 minutes, weigh them, and record the weight as m. 2-1 The loss rate of the moisturizing ingredients was measured. Then, the sample was placed in a 60°C electric heating drying oven for 6 hours. 1-1 All samples were treated under standard atmospheric conditions (temperature 23℃, relative humidity 50%RH) for 24 hours and then relabeled as moisturizing ingredient C. 1-2 Take a sample and weigh it, and record the weight as m. 1-2 ; will C 1-2 After being placed in a 60℃ electric heating drying oven for a period of time, each sample was removed and cooled in a desiccator for 5 minutes before being weighed and recorded as m. 2-2 The loss rate of moisturizing ingredients after rehydration was measured. The results are as follows: Figure 2 As shown.

[0023] (2) Preparation and processing of finished paper products: The basis weight is 14 g / m 2 The base paper is rewound into 3 layers, and C is... 1-1 and C 1-2 The additive is applied evenly to the laminated 3-layer base paper at a rate of 35% under the same roller coating conditions, and then cut into 133mm × 195mm pieces to form the finished paper product T. 1-1 and T 1-2 .

[0024] (3) Evaluation of the moisture retention of finished paper products: T of finished paper products 1-1 and T 1-2 Samples were taken and weighed directly without any temperature or humidity treatment, and the weights were recorded as m. 3-1 and m 3-2 ; T 1-1 and T 1-2The sample was treated under standard atmospheric conditions (temperature 23℃, relative humidity 50%RH) for 2 hours, weighed, and recorded as m. 4-1 and m 4-2 ; after temperature and humidity treatment T 1-1 and T 1-2 Place the sample in a 60℃ electric heating drying oven for 1 hour, then remove it and cool it in a desiccator for 5 minutes. Weigh the sample and record the weight as m. 5-1 and m 5-2 Calculate the moisture retention of the finished paper product.

[0025] (4) Performance correlation and effectiveness analysis: By comparing the moisture-retaining component itself and its loss rate after rewetting with the moisture-retaining properties of the finished paper, and combining the retention rate of the moisture-retaining component on the base paper, the influence of the binding state of the target moisture-retaining component and the base paper on its moisture-retaining performance is evaluated.

[0026] (a) Loss rate of moisturizing ingredients: C 1-1 %=(m 1-1 -m 2-1 )×100 / m 1-1 C 1-2 %=(m 1-2 -m 2-2 )×100 / m 1-2 (b) Retention rate of moisturizing ingredients on paper: When sampling directly, C 1-1 %=[1-(m 3-1 -m 5-1 [(14×3×0.133×0.195)]×100 When sampling directly, C 1-2 %=[1-(m 3-2 -m 5-2 [(14×3×0.133×0.195)]×100 Under standard atmospheric conditions, C 1-1 %=[1-(m 4-1 -m 5-1 [(14×3×0.133×0.195)]×100 Under standard atmospheric conditions, C 1-2 %=[1-(m 4-2 -m 5-2 [(14×3×0.133×0.195)]×100 (c) Moisture retention of finished paper products 35 : When sampling directly, T 1-1 %=(m 3-1 -m 5-1)×100 / (m 3-1 ×35% When sampling directly, T 1-2 %=(m 3-2 -m 5-2 )×100 / (m 3-2 ×35% Under standard atmospheric conditions, T 1-1 %=(m 4-1 -m 5-1 )×100 / (m 3-1 ×35% Under standard atmospheric conditions, T 1-2 %=(m 4-2 -m 5-2 )×100 / (m 3-2 ×35% Note: ① All units of mass above are grams; ② Moisturizing properties 35 This indicates the moisturizing effect based on a 35% addition of moisturizing ingredients.

[0027]

[0028] like Figure 2 As shown, the moisturizing ingredient experiences a high rate of loss in the initial stage, but the loss gradually slows down after 60 minutes of continuous moisturizing. Furthermore, C... 1-1 The churn rate is consistently lower than C. 1-2 Within 6 hours, C 1-1 and C 1-2 The loss rates of moisturizing ingredients are similar.

[0029] As shown in Table 1, T 1-1 and T 1-2 Compared to direct sampling, the retention rate of moisturizing components on the paper was slightly lower after treatment under standard atmospheric conditions (temperature 23℃, relative humidity 50%RH) in both groups of finished paper products, indicating improved moisture retention. 35 However, the humidity is high, which may be due to the high humidity under standard atmospheric conditions, allowing the finished paper products to effectively absorb moisture from the environment.

[0030] Paper products with this moisturizing ingredient exhibit good softness, but the softness values ​​vary little between different products; the overall hand feel of each paper product is significantly improved, with some differences observed between samples. Moisturizing properties 35 The higher the value (i.e., the better the moisture retention), the lower its softness value (i.e., the softer the finished paper), and the higher the overall feel value (i.e., the smoother and more delicate the finished paper feels).

[0031] In summary, moisturizing ingredient C 1-1Its own loss rate is low, and after one rehumidification, its core moisturizing performance is effectively preserved with limited attenuation, not affecting its basic usage effect. 1-1 and C 1-2 At an addition level of 35%, both exhibit good retention rates, paper moisture retention, softness, and overall hand feel on the same type of base paper. When the air humidity is high, they can absorb moisture from the air, making the moisturizing paper more hydrated. The moisturizing component also binds well with the paper fibers. Example 2

[0032] (1) Evaluation of the performance of moisturizing ingredients: Two moisturizing ingredients, labeled H1 and H2, were directly sampled and weighed, and the weights were recorded as q. 1-1 and q 1-2 The loss rate of these two moisturizing ingredients was investigated under two conditions: Condition 1, H1 and H2 were treated under high temperature and low humidity (i.e., temperature 38℃, relative humidity 20%RH) conditions for a period of time, and samples were taken and weighed immediately, recorded as q. 2-1 and q 2-2 Condition 2: Place H1 and H2 in a 40℃ vacuum oven for a period of time, take samples immediately, weigh them, and record the weight as q. 3-1 and q 3-2 Calculate the loss rate of the moisturizing ingredients themselves. The loss rate of moisturizing ingredients before and after temperature and humidity treatment is as follows: Figure 3 As shown; the loss rate of moisturizing ingredients before and after vacuum drying is as follows: Figure 4 As shown.

[0033] (2) Preparation and treatment of finished paper products: Select moisturizing ingredients with low loss rate, and apply them evenly to the same paper with a basis weight of 45g / m³ by impregnation and spraying at an addition rate of 20%. 2 On the base paper, it is then rewound into two layers, and then cut into 210mm×210mm pieces to form paper products P1 and P2.

[0034] (3) Evaluation of moisture retention of finished paper products: Finished paper products P1 and P2 were directly sampled and weighed without any temperature and humidity treatment, and the weights were recorded as q. 4-1 and q 4-2 The moisture retention properties of the two paper products were investigated under two conditions: Condition 1, paper products P1 and P2 were treated for a period of time under low temperature and high humidity conditions (i.e., temperature 15℃ and relative humidity 80%RH), and their weights were recorded as q. 5-1 and q 5-2 Condition 2: Place the finished paper products P1 and P2 in a 50℃ electric heating drying oven, but turn off the rotating basket and fan power, keep them at this temperature for a period of time, then remove them and weigh them immediately, recording the weight as q. 6-1 and q 6-2 Calculate the moisture retention of the finished paper products separately.

[0035] (4) Performance correlation and effectiveness analysis: By comparing the loss rate of the moisturizing component itself with the moisturizing property of the finished paper, and combining the retention rate of the moisturizing component on the base paper, the influence of the binding state of the target moisturizing component and the base paper on its moisturizing performance is evaluated.

[0036] (a) Loss rate of moisturizing ingredients: Before and after high temperature and low humidity treatment, H1% = (q 1-1 -q 2-1 )×100 / q 1-1 Before and after high temperature and low humidity treatment, H2% = (q 1-2 -q 2-2 )×100 / q 1-2 Before and after vacuum drying, H1% = (q 1-1 -q 3-1 )×100 / q 1-1 Before and after vacuum drying, H2% = (q 1-2 -q 3-2 )×100 / q 1-2 (b) Retention rate of moisturizing ingredients on paper: When sampling directly, P1% = [1 - (q)] 4-1 -q 6-1 [45×2×0.210×0.210)] ×100 When sampling directly, P2% = [1 - (q)] 4-2 -q 6-2 [45×2×0.210×0.210)] ×100 Under low temperature and high humidity conditions, P1% = [1 - (q)] 5-1 -q 6-1 [45×2×0.210×0.210)] ×100 Under low temperature and high humidity conditions, P2% = [1 - (q)] 5-2 -q 6-2 [45×2×0.210×0.210)] ×100 (c) Moisture retention of finished paper products 20 : When sampling directly, P1% = (q 4-1 -q 6-1 )×100 / (q) 4-1 ×20% When sampling directly, P2% = (q) 4-2 -q 6-2 )×100 / (q) 4-2 ×20% Under low temperature and high humidity conditions, P1% = (q5-1 -q 6-1 )×100 / (q) 4-1 ×20% Under low temperature and high humidity conditions, P2% = (q 5-2 -q 6-2 )×100 / (q) 4-2 ×20% Note: ① All units of mass above are grams; ② Moisturizing properties 20 This indicates the moisturizing effect based on a 20% addition of moisturizing ingredients.

[0037]

[0038] like Figure 3 As shown, under high temperature and low humidity conditions, the moisturizing component in H1 and H2 is slowly lost, with a high loss rate in the initial stage. The loss gradually slows down after 40 minutes of treatment. Figure 4 As shown, vacuum drying accelerates the rapid loss of H1 and H2. Furthermore, under both conditions, the loss rate of H1 is consistently greater than that of H2; therefore, H2 is selected as the preferred moisturizing ingredient and applied to the base paper.

[0039] As shown in Table 2, P1 exhibits more stable performance. Both the retention rate of the moisturizing ingredients on the paper and the moisture retention of the finished paper product show small fluctuations under different temperature and humidity conditions, indicating that H2 may be more suitable for application to the base paper via impregnation.

[0040] In summary, the moisturizing component H2 can effectively lock in water (with slow loss) under high temperature and low humidity conditions, and the paper product P1 prepared by impregnation maintains stable water retention capacity in low temperature and high humidity environments.

[0041] Whether it is H2 itself or its combination with the base paper, it continues to lose weight even in high humidity environments. Possible reasons include a low proportion of active ingredients, easy volatility or migration, resulting in low moisturizing efficiency and poor durability. Another possible reason is that the amount of moisturizing ingredients added to H2 is too low, only 20%, which will also affect moisturizing efficacy and long-term stability.

[0042] Examples 1-2, combined with actual usage scenarios, quantitatively compared the bulk behavior of moisturizing ingredients and their performance in finished products. The entire testing process does not require complex and expensive instruments, and the operation steps are simple, making it very suitable for online quality monitoring in production sites and raw material inspection upon arrival.

[0043] This invention assesses the inherent stability of moisturizing ingredients and their binding state with specific paper fibers through the sequence and logical connection between four steps, providing clear guidance for research and development and production. This enables a shift from "trial and error based on experience" to "scientific screening," ultimately achieving the core industrial goal of ensuring and improving the moisturizing performance of paper while reducing the amount of expensive moisturizing ingredients used.

Claims

1. A simplified evaluation method and application for the moisturizing properties of moisturizing components and their paper products, characterized in that, Includes the following steps: (1) Evaluation of the performance of moisturizing ingredients: The moisturizing performance of the target moisturizing ingredients is measured to obtain their basic moisturizing data; (2) Paper product preparation and processing: The target moisturizing component is applied to the base paper using a predetermined process to prepare a paper product containing the moisturizing component; (3) Evaluation of the moisture retention of the paper product: The moisture retention performance of the paper product prepared in step (2) is measured to obtain the moisture retention data of the paper product; (4) Performance correlation and effectiveness analysis: The basic moisturizing data obtained in step (1) and the moisturizing data of the finished paper obtained in step (3) are compared and correlated to evaluate the moisturizing effectiveness of the target moisturizing component on the base paper.

2. The simplified evaluation method and application of the moisturizing component and its paper product moisturizing performance according to claim 1, characterized in that, The determination of the moisturizing performance of the target moisturizing ingredient in step (1) specifically involves measuring at least one of the moisture absorption rate, loss rate, or moisturizing rate of the moisturizing ingredient under a set temperature and humidity environment.

3. The simplified evaluation method and application of the moisturizing component and its paper product moisturizing performance according to claim 1, characterized in that, In step (4), the effectiveness of the moisturizing ingredient on the base paper is evaluated by calculating at least one of the retention rate of the moisturizing ingredient on the paper, the softness of the finished paper, or the overall hand feel; based on the retention rate of the moisturizing ingredient, the softness of the finished paper, or the overall hand feel, the influence of the binding state of the target moisturizing ingredient with the base paper on its moisturizing performance is evaluated.

4. The simplified evaluation method and application of the moisturizing component and its paper product moisturizing performance according to claim 1, characterized in that, The determination of the moisturizing performance of the target moisturizing ingredient in step (1) specifically involves measuring the basic moisturizing data of the moisturizing ingredient under simulated actual use environment or accelerated aging or cyclic rehumidification test conditions.

5. The simplified evaluation method and application of the moisturizing component and its paper product moisturizing performance according to claim 1, characterized in that, The predetermined process described in step (2) is at least one of impregnation, coating, spraying or internal addition.

6. The simplified evaluation method and application of the moisturizing component and its paper product moisturizing performance according to claim 1, characterized in that, In step (3), the paper product is tested for its moisture retention performance. Specifically, the moisture retention data of the paper product is measured under simulated actual use environment or accelerated aging or cyclic rehumidification test conditions.

7. The simplified evaluation method and application of the moisturizing component and its paper product moisturizing performance according to claim 1, characterized in that, The step of evaluating the moisturizing ingredients and their paper products using the method described in any one of claims 1 to 6 and providing feedback for adjusting process parameters.

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