Preparation method of degradable and highly breathable loofah sponge fiber paper

Abstract

The invention provides a preparation method of degradable and highly breathable loofah sponge fiber paper. The preparation method comprises the following steps: cleaning and pretreating loofah sponge; carrying out alkaline hydrogen peroxide modification treatment on the pretreated loofah sponge; mechanically crushing the modified loofah sponge to obtain loofah sponge fibers; the preparation method comprises the following steps: mixing loofah sponge fibers with a dispersing agent, adding the mixture into water, dispersing to obtain dispersed fibers, preparing a fiber web by using a wet papermaking process after the dispersed fibers are completely dispersed, and performing hot-pressing shaping on the fiber web. In the preparation process, no extra fiber is used, excellent physical performance is achieved, the method is simple, and the cost is low. The loofah sponge fiber paper can be widely applied to the fields of circulation field paper, including food and medicine packaging paper, hospital paper, indoor environment protection paper, cultural relic protection paper, household paper and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of papermaking, and particularly relates to a preparation method of loofah fiber paper with degradability and high air permeability. Background Art

[0002] With the continuous improvement of global environmental awareness, the demand for degradable and high-performance materials has been continuously increasing. As a material widely used in packaging, printing, and daily life, the degradability and physical properties of paper have also received more and more attention. Among traditional paper-based materials, paper-based materials made of chemical fibers and plastics have poor degradability, are prone to cause long-term environmental pollution, and have extremely poor air permeability. While degradable paper mainly made of wood faces serious sustainability problems due to the decreasing forest resources. At the same time, the functional requirements for paper are also constantly expanding. Especially in the fields of packaging, filtration, and medical treatment, high-air-permeability paper has received extensive attention due to its excellent air permeability. However, the production of existing high-air-permeability paper overly relies on high-cost raw materials or complex preparation processes, which limits its large-scale popularization and application. As an economic crop, loofah has low planting costs and wide sources, with significant resource advantages. The main chemical components of loofah are 60.0 - 66.5% α-cellulose, 17.4 - 23.3% hemicellulose, 9.1 - 15.5% lignin, and 0.4 - 3.0% ash. It is a natural polymer material with high fiber content, good flexibility, high quality, low price, and non-toxic and renewable. In summary, the papermaking industry urgently needs a solution that combines high performance, environmental protection, economy, and sustainability. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a preparation method of loofah fiber paper with degradability and high air permeability, aiming to make full use of loofah resources, develop a green and environmentally friendly paper-based material, meet the dual requirements of high performance and environmental protection, and promote the sustainable development of the papermaking industry.

[0004] To solve the above technical problems, the technical solution adopted by the present invention is to provide a preparation method of loofah fiber paper with degradability and high air permeability, including the following steps: Step 1): Pretreat the loofah. Step 2): Perform alkaline hydrogen peroxide modification treatment on the pretreated loofah obtained in Step 1). Step 3): Mechanically crush the modified loofah obtained in Step 2) to obtain loofah fibers. Step 4): Mix the loofah fiber obtained in step 3) with a dispersant, add it to water for dispersion to obtain dispersed fibers. After complete dispersion, use the wet papermaking process to form a fiber web and perform hot pressing and shaping to obtain a degradable and highly breathable loofah fiber paper.

[0005] Preferably, the conditions for pretreatment in step 1) are: Wash the loofah completely three times with distilled water and ethanol, and then place it in an oven at 60 °C to dry to a constant weight. Preferably, the method for alkaline hydrogen peroxide modification treatment in step 2) is: Place the pretreated loofah in a solution containing 5-10% NaOH and 5-10% H2O2 by mass concentration, and cook for 3-5 h by water bath heating at 70-90 °C. Preferably, the time for mechanical crushing in step 3) is 10-30 s. Preferably, the dispersant in step 4) is polyvinyl alcohol. Preferably, the conditions for dispersion in step 4) are: The bath ratio of water to loofah fiber is controlled at 300-500 ml:1 g, the rotation speed is 3000-6000 r / s, and the treatment time is 5-10 min. Preferably, the conditions for hot pressing and shaping in step 4) are: Reinforce under a hot plate at 50-80 °C for 5-10 min. Preferably, the grammage of the fiber web in step 4) is 20-100 g / m 2 。 In another aspect of the present invention, a raw material for paper preparation is provided to facilitate the preparation of loofah fiber paper by the preparation method of the degradable and highly breathable loofah fiber paper.

[0006] Compared with the prior art, the beneficial effects of the present invention are: 1. Using natural loofah fiber as the raw material for paper preparation, no additional fiber is added during the preparation process, effectively reducing production costs and achieving the goals of environmental protection and health. 2. The loofah fiber paper prepared by the present invention has excellent degradability, air permeability and mechanical properties, and the preparation process is simple and the production efficiency is high. 3. The loofah fiber paper can be widely used in papers for the circulation field, including papers for food and drug packaging, hospital papers, indoor environmental protection papers, cultural relic protection papers and household papers, etc. Brief Description of the Drawings

[0007] Figure 1 This is the loofah fiber paper prepared in Example 1 of the present invention. Figure 2 This is the display of the softness of the loofah fiber paper prepared in Example 1 of the present invention. Detailed Description of the Invention

[0008] To make the present invention more obvious and understandable, the following is a detailed description with preferred embodiments and accompanying drawings. The present invention provides a method for preparing a degradable and highly breathable loofah fiber paper: the loofah is subjected to cleaning pretreatment; the pretreated loofah is subjected to alkaline hydrogen peroxide modification treatment; the modified loofah is mechanically pulverized to obtain loofah fibers; the loofah fibers and a dispersant are placed in water for dispersion to obtain dispersed fibers. After complete dispersion, a fiber web is formed by a wet papermaking process and heat-pressed and shaped to obtain a degradable and highly breathable loofah fiber paper.

[0009] Example 1 The present invention provides a method for preparing a degradable and highly breathable loofah fiber paper, comprising the following steps: 1. The original loofah is completely washed three times with distilled water and ethanol and then placed in an oven at 60 °C to dry to a constant weight to obtain pretreated loofah. 2. The pretreated loofah is subjected to alkaline hydrogen peroxide modification treatment. The alkaline hydrogen peroxide modification treatment method is: the pretreated loofah is placed in a solution containing 5% by mass of NaOH and 5% by mass of H2O2 and boiled for 3 h in a water bath at 90 °C. 3. The modified loofah is mechanically pulverized for 10 s to obtain loofah fibers. 4. 0.5 g of loofah fibers and 0.25 g of polyvinyl alcohol are mixed and added to a fiber disperser for dispersion. The bath ratio of water to loofah fibers is controlled at 500 ml:1 g, the rotation speed is 6000 r / s, and the treatment time is 5 min. 5. The completely dispersed loofah fibers are formed into a suspended fiber web by a wet papermaking process, with a grammage of 20 - 100 g / m 2 , and the obtained fiber web is strengthened on a hot plate at 70 °C for 5 - 10 min to obtain a degradable and highly breathable loofah fiber paper, as Figure 1 shown; 6. The loofah fiber paper prepared above has excellent degradability (mass loss rate in 30 days: 68.98%), mechanical properties (air permeability: 208.75 mm / s; strength: 69 N), and softness (bending stiffness: 0.0669 gf·cm² / cm), as Figure 2 shown. Example 2 The present invention provides a method for preparing a degradable and highly breathable loofah fiber paper, comprising the following steps: 1. The original loofah is completely washed three times with distilled water and ethanol and then placed in an oven at 60 °C to dry to a constant weight to obtain pretreated loofah. 2. Subject the pretreated loofah sponge to alkaline hydrogen peroxide modification. The conditions for alkaline hydrogen peroxide modification are as follows: Place the pretreated loofah sponge in a solution containing 5% NaOH and 5% H2O2 by mass concentration, and boil it in a water bath at 90 °C for 3 h; 3. Mechanically crush the modified loofah sponge for 30 s to obtain loofah sponge fibers; 4. Mix 0.5 g of loofah sponge fibers and 0.25 g of polyvinyl alcohol, add them to a fiber disperser for dispersion. Control the bath ratio of water to fibers at 500 ml:1 g, the rotation speed at 6000 r / s, and the treatment time at 5 min; 5. Use the wet papermaking process to form a suspended fiber web from the completely dispersed loofah sponge fibers, with a grammage of 20 - 100 g / m 2 , and reinforce the obtained fiber web on a hot plate at 70 °C for 5 - 10 min to obtain a degradable and highly breathable loofah sponge fiber paper; 6. The loofah sponge fiber paper prepared above has excellent degradability (mass loss rate in 30 days: 65.14%), mechanical properties (air permeability: 196.07 mm / s; strength: 57.5 N), and softness (bending stiffness: 0.0698 gf·cm² / cm).

[0010] Example 3 The present invention provides a method for preparing a degradable and highly breathable loofah sponge fiber paper, comprising the following steps: 1. Thoroughly wash the original loofah sponge three times with distilled water and ethanol, and then place it in an oven at 60 °C to dry to a constant weight to obtain a pretreated loofah sponge; 2. Subject the pretreated loofah sponge to alkaline hydrogen peroxide modification. The conditions for alkaline hydrogen peroxide modification are as follows: Place the pretreated loofah sponge in a solution containing 5% NaOH and 5% H2O2 by mass concentration, and boil it in a water bath at 90 °C for 3 h; 3. Mechanically crush the modified loofah sponge for 10 s and 30 s respectively to obtain loofah sponge fibers of different specifications; 4. Mix 0.25 g of loofah sponge fibers mechanically crushed for 10 s, 0.25 g of loofah sponge mechanically crushed for 30 s, and 0.25 g of polyvinyl alcohol, add them to a fiber disperser for dispersion. Control the bath ratio of water to fibers at 500 ml:1 g, the rotation speed at 6000 r / s, and the treatment time at 5 min 5. Use the wet papermaking process to form a suspended fiber web from the completely dispersed loofah sponge fibers, with a grammage of 20 - 100 g / m 2 , and reinforce the obtained fiber web on a hot plate at 70 °C for 5 - 10 min to obtain a degradable and highly breathable loofah sponge fiber paper; 6. The loofah fiber paper prepared above has excellent degradability (mass loss rate in 30 days: 73.66%), mechanical properties (air permeability: 273.24 mm / s; strength: 40.18 N), and softness (bending stiffness: 0.0410 gf·cm² / cm).

[0011] The above embodiments show that the present invention uses natural loofah fibers as raw materials for paper preparation, does not use any additional fibers during the preparation process, has excellent physical properties, a simple method, and low cost.

[0012] The above is only a preferred embodiment of the present invention, and does not impose any formal or substantial limitations on the present invention. It should be noted that for those of ordinary skill in the art of this technology, without departing from the premise of the present invention, several improvements and supplements can still be made, and these improvements and supplements should also be regarded as the protection scope of the present invention. Any equivalent changes made by those skilled in the art in the spirit and scope of the present invention by making some changes, modifications, and evolutions using the technical content disclosed above are equivalent embodiments of the present invention; at the same time, any equivalent changes, modifications, and evolutions made to the above embodiments based on the essential technology of the present invention still fall within the scope of the technical solutions of the present invention.

Claims

1. A method for preparing a degradable and highly breathable loofah fiber paper, characterized in that: The following steps are involved: Step 1): The loofah was completely washed with distilled water and ethanol three times and then placed in a 60°C oven to dry to constant weight to obtain a pretreated loofah; Step 2): The pretreated loofah obtained in step 1) is subjected to alkaline hydrogen peroxide modification treatment to obtain a modified loofah; Step 3): Mechanically crushing the modified loofah obtained in step 2) for 10-30 seconds to obtain loofah fibers; Step 4): The loofah fibers obtained in step 3) are mixed with a dispersant and added into water for dispersion to obtain dispersed fibers. After complete dispersion, a fiber web is made by a wet papermaking process and hot-pressed to obtain a degradable and highly breathable loofah fiber paper.

2. A method for preparing a degradable, highly breathable loofah fiber paper as claimed in claim 1, characterized in that: The method of alkaline hydrogen peroxide modification treatment in step 2) is: placing the pretreated loofah in a solution containing 5-10% NaOH and 5-10% H2O2 by mass concentration and heating it in a water bath at 70-90°C for 3-5h.

3. A method for preparing a degradable, highly breathable loofah fiber paper as claimed in claim 1, characterized in that: In the step 4), the dispersant is polyvinyl alcohol.

4. A method for preparing a degradable, highly breathable loofah fiber paper as claimed in claim 1, characterized in that: The dispersion conditions in step 4) are as follows: the bath ratio of water to loofah fiber is controlled to be 300-500 ml:1 g, the rotation speed is 3000-6000 r / s, and the processing time is 5-10 min.

5. The method for preparing a degradable and highly breathable loofah fiber paper according to claim 1, characterized in that: The conditions for hot pressing and shaping in step 4) are: consolidation on a hot plate at 50-80° C. for 5-10 minutes.

6. The method for preparing a degradable and highly breathable loofah fiber paper according to claim 1, characterized in that: The weight of the fiber web in step 4) is 20-100 g / m 2 .

7. A paper making raw material, characterized in that: To facilitate the preparation method of the degradable and highly breathable loofah fiber paper described in any one of claims 1-6, loofah fiber paper is prepared.

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