Mineral-containing plant fiber paper and process for its production

Abstract

The present application relates to the field of Tibetan paper, and more particularly to a mineral-containing plant fiber Tibetan paper and a preparation process thereof. The wolf root system is used as a fiber raw material, and chitosan modified talc and calcium chloride are added in the paper pulp. The present application combines traditional Tibetan paper making techniques with modern technology. After adding chitosan modified talc and calcium chloride in the paper pulp, the strength of the paper is improved, and the aging resistance is also improved. By compounding chitosan on the surface of talc, hydrogen bonds can be formed between the paper pulp fibers, improving the combination between talc and fibers, so that the tensile strength of the paper prepared by using modified talc powder is significantly improved compared with the paper filled with pure talc powder. Meanwhile, the presence of calcium chloride can make chitosan modified talc more adsorbed on the fibers, improving the aging resistance of the paper.

Description

Technical Field

[0001] This invention relates to the field of Tibetan paper, and more particularly to a mineral-containing plant fiber Tibetan paper and its preparation process. Background Technology

[0002] Tibetan paper is a unique type of handmade paper with distinctive ethnic characteristics. Its main raw material is the bast fiber from the roots of the wolfsbane plant, which is widely distributed in Tibet. It is made using the traditional pouring method. The pouring process involves the following steps: harvesting, washing, pounding, peeling, tearing, boiling, beating, pulping, pouring, drying, and peeling. Originating from the snowy plateau, Tibetan paper is a treasure of Tibetan culture. Due to the inherent toxicity of the wolfsbane plant, scriptures, government documents, and archives printed on Tibetan paper possess excellent durability, are resistant to insects and rodents, and are not easily rotten or discolored, making them highly sought after by calligraphers and collectors.

[0003] However, the main raw material for Tibetan paper is the bast fiber from the roots of the wolfsbane plant, which has a relatively low cellulose content. The wolfsbane fibers are also relatively short and fine, which makes the interweaving and bonding between the fibers weak, thus reducing the mechanical strength of the paper. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a mineral-containing plant fiber paper and its preparation process.

[0005] This invention is achieved through the following technical solution:

[0006] A mineral-containing plant fiber Tibetan paper uses the roots of Euphorbia fischeriana as the fiber raw material, with chitosan-modified talc and calcium chloride added to the pulp.

[0007] Furthermore, the mass ratio of pulp, chitosan-modified talc, and calcium chloride in the pulp is 100:1 to 5:0.5.

[0008] Furthermore, the mass ratio of pulp, chitosan-modified talc, and calcium chloride in the pulp is 100:3 to 5:0.5.

[0009] Furthermore, the mass ratio of pulp, chitosan-modified talc, and calcium chloride in the pulp is 100:3:0.5.

[0010] Furthermore, the preparation method of the chitosan-modified talc is as follows:

[0011] Step S11: Disperse the talc in deionized water;

[0012] Step S12: Disperse chitosan into acetic acid water, with a volume ratio of acetic acid to water of 5:95, and then stir for 20 minutes;

[0013] Step S13: Mix the products from steps S1 and S2 together, adjust the pH to 10 with sodium hydroxide, stir for 10 min, filter to obtain a precipitate, and vacuum dry the precipitate at 50°C.

[0014] Furthermore, the mass ratio of talc in step S11 to chitosan in step S12 is 5 to 0.5.

[0015] This invention also provides a process for preparing mineral-containing plant fiber paper, comprising the following steps:

[0016] Step S1: Take the roots of the wolfsbane, soak them in water for 1 day to remove the soil, then crush the roots with a hammer, remove the fibrous tissue between the outer skin and the inner stem, and dry them completely in the sun.

[0017] Step S2: Heat the fibrous tissue and sodium carbonate obtained in step S1 in water while stirring. After heating to boiling, maintain a gentle boil for 2 hours without adding water.

[0018] Step S3: Remove the product from step S2, squeeze out the water, and pound it for 1 hour;

[0019] Step S4: Add water to the product from step S3 and stir to make the pulp suspend evenly;

[0020] Step S5: Mix the pulp obtained in step S4, chitosan-modified talc and anhydrous calcium chloride evenly, and pour an appropriate amount into the paper curtain. Then slowly place the paper curtain into a clean, flowing water tank so that the pulp is evenly distributed in the paper curtain. Then slowly lift the paper curtain to drain the water.

[0021] Step S6: Let the paper curtain dry in the sun. Before it is completely dry, peel off the paper to reveal the hidden paper.

[0022] Furthermore, in step S2, the mass ratio of fibrous tissue to sodium carbonate is 2.5:0.1.

[0023] Furthermore, the Tibetan paper is used in writing, painting, and tie-dyeing.

[0024] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0025] This invention combines traditional Tibetan papermaking techniques with modern technology. By adding chitosan-modified talc and calcium chloride to the pulp, the strength and aging resistance of the paper are improved. By compounding chitosan on the surface of the talc, hydrogen bonds are formed between the pulp fibers, improving the bond between talc and fibers. This results in a significant increase in tensile strength of paper made with modified talc compared to paper filled with pure talc. Simultaneously, the presence of calcium chloride allows for greater adsorption of chitosan-modified talc onto the fibers, further enhancing the paper's aging resistance. Attached Figure Description

[0026] Figure 1 This is a SEM image of chitosan-modified talc in an embodiment of the present invention. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the embodiments. The illustrative embodiments and descriptions of this invention are only used to explain this invention and are not intended to limit this invention.

[0028] Example 1

[0029] Preparation process of a mineral-containing plant fiber Tibetan paper

[0030] Step S1: Take the roots of the wolfsbane, soak them in water for 1 day to remove the soil, then crush the roots with a hammer, remove the fibrous tissue between the outer skin and the inner stem, and dry them completely in the sun.

[0031] Step S2: Take 2.5 kg of the fibrous tissue obtained in step S1 and 0.1 kg of sodium carbonate and heat it with 2.5 kg of water while stirring. After heating to boiling, maintain a gentle boil for 2 hours without adding water.

[0032] Step S3: Remove the product from step S2, squeeze out the water, and pound it for 1 hour;

[0033] Step S4: Add water to the product from step S3 and stir to make the pulp suspend evenly;

[0034] Step S5: Mix the pulp obtained in step S4, chitosan-modified talc, and anhydrous calcium chloride at a mass ratio of 100:1:0.5 until homogeneous, then pour an appropriate amount into the paper screen. Figure 1 The image shows a SEM image of chitosan-modified talc. Then, the paper curtain is slowly placed into a clean, flowing pool of water to distribute the pulp evenly in the paper curtain. The paper curtain is then slowly lifted to drain the water.

[0035] Step S6: Let the paper curtain dry in the sun. Before it is completely dry, peel off the paper to reveal the hidden paper.

[0036] The preparation method of the chitosan-modified talc is as follows:

[0037] Step S11: Disperse 5g of talc into 50mL of deionized water;

[0038] Step S12: Disperse 0.5g of chitosan into 50mL of acetic acid water, with a volume ratio of acetic acid to water of 5:95, and then stir for 20min;

[0039] Step S13: Mix the products from steps S1 and S2 together, adjust the pH to 10 with sodium hydroxide, stir for 10 min, filter to obtain a precipitate, and vacuum dry the precipitate at 50°C.

[0040] Example 2

[0041] Preparation process of a mineral-containing plant fiber Tibetan paper

[0042] Step S1: Take the roots of the wolfsbane, soak them in water for 1 day to remove the soil, then crush the roots with a hammer, remove the fibrous tissue between the outer skin and the inner stem, and dry them completely in the sun.

[0043] Step S2: Take 2.5 kg of the fibrous tissue obtained in step S1 and 0.1 kg of sodium carbonate and heat it with 2.5 kg of water while stirring. After heating to boiling, maintain a gentle boil for 2 hours without adding water.

[0044] Step S3: Remove the product from step S2, squeeze out the water, and pound it for 1 hour;

[0045] Step S4: Add water to the product from step S3 and stir to make the pulp suspend evenly;

[0046] Step S5: Mix the pulp obtained in step S4, chitosan-modified talc and anhydrous calcium chloride in a mass ratio of 100:2:0.5, and pour an appropriate amount into the paper curtain. Then slowly place the paper curtain into a clean, flowing water tank to make the pulp evenly distributed in the paper curtain. Then slowly lift the paper curtain to drain the water.

[0047] Step S6: Let the paper curtain dry in the sun. Before it is completely dry, peel off the paper to reveal the hidden paper.

[0048] The preparation method of the chitosan-modified talc is the same as in Example 1.

[0049] Example 3

[0050] Preparation process of a mineral-containing plant fiber Tibetan paper

[0051] Step S1: Take the roots of the wolfsbane, soak them in water for 1 day to remove the soil, then crush the roots with a hammer, remove the fibrous tissue between the outer skin and the inner stem, and dry them completely in the sun.

[0052] Step S2: Take 2.5 kg of the fibrous tissue obtained in step S1 and 0.1 kg of sodium carbonate and heat it with 2.5 kg of water while stirring. After heating to boiling, maintain a gentle boil for 2 hours without adding water.

[0053] Step S3: Remove the product from step S2, squeeze out the water, and pound it for 1 hour;

[0054] Step S4: Add water to the product from step S3 and stir to make the pulp suspend evenly;

[0055] Step S5: Mix the pulp obtained in step S4, chitosan-modified talc and anhydrous calcium chloride in a mass ratio of 100:3:0.5, and pour an appropriate amount into the paper curtain. Then slowly place the paper curtain into a clean, flowing water tank to distribute the pulp evenly in the paper curtain. Then slowly lift the paper curtain to drain the water.

[0056] Step S6: Let the paper curtain dry in the sun. Before it is completely dry, peel off the paper to reveal the hidden paper.

[0057] The preparation method of the chitosan-modified talc is the same as in Example 1.

[0058] Example 4

[0059] Preparation process of a mineral-containing plant fiber Tibetan paper

[0060] Step S1: Take the roots of the wolfsbane, soak them in water for 1 day to remove the soil, then crush the roots with a hammer, remove the fibrous tissue between the outer skin and the inner stem, and dry them completely in the sun.

[0061] Step S2: Take 2.5 kg of the fibrous tissue obtained in step S1 and 0.1 kg of sodium carbonate and heat it with 2.5 kg of water while stirring. After heating to boiling, maintain a gentle boil for 2 hours without adding water.

[0062] Step S3: Remove the product from step S2, squeeze out the water, and pound it for 1 hour;

[0063] Step S4: Add water to the product from step S3 and stir to make the pulp suspend evenly;

[0064] Step S5: Mix the pulp obtained in step S4, chitosan-modified talc and anhydrous calcium chloride in a mass ratio of 100:4:0.5, and pour an appropriate amount into the paper curtain. Then slowly place the paper curtain into a clean, flowing water tank to distribute the pulp evenly in the paper curtain. Then slowly lift the paper curtain to drain the water.

[0065] Step S6: Let the paper curtain dry in the sun. Before it is completely dry, peel off the paper to reveal the hidden paper.

[0066] The preparation method of the chitosan-modified talc is the same as in Example 1.

[0067] Example 5

[0068] Preparation process of a mineral-containing plant fiber Tibetan paper

[0069] Step S1: Take the roots of the wolfsbane, soak them in water for 1 day to remove the soil, then crush the roots with a hammer, remove the fibrous tissue between the outer skin and the inner stem, and dry them completely in the sun.

[0070] Step S2: Take 2.5 kg of the fibrous tissue obtained in step S1 and 0.1 kg of sodium carbonate and heat it with 2.5 kg of water while stirring. After heating to boiling, maintain a gentle boil for 2 hours without adding water.

[0071] Step S3: Remove the product from step S2, squeeze out the water, and pound it for 1 hour;

[0072] Step S4: Add water to the product from step S3 and stir to make the pulp suspend evenly;

[0073] Step S5: Mix the pulp obtained in step S4, chitosan-modified talc and anhydrous calcium chloride in a mass ratio of 100:5:0.5, and pour an appropriate amount into the paper curtain. Then slowly place the paper curtain into a clean, flowing water tank to distribute the pulp evenly in the paper curtain. Then slowly lift the paper curtain to drain the water.

[0074] Step S6: Let the paper curtain dry in the sun. Before it is completely dry, peel off the paper to reveal the hidden paper.

[0075] The preparation method of the chitosan-modified talc is the same as in Example 1.

[0076] Comparative Example 1

[0077] Preparation process of a mineral-containing plant fiber Tibetan paper

[0078] Step S1: Take the roots of the wolfsbane, soak them in water for 1 day to remove the soil, then crush the roots with a hammer, remove the fibrous tissue between the outer skin and the inner stem, and dry them completely in the sun.

[0079] Step S2: Take 2.5 kg of the fibrous tissue obtained in step S1 and 0.1 kg of sodium carbonate and heat it with 2.5 kg of water while stirring. After heating to boiling, maintain a gentle boil for 2 hours without adding water.

[0080] Step S3: Remove the product from step S2, squeeze out the water, and pound it for 1 hour;

[0081] Step S4: Add water to the product from step S3 and stir to make the pulp suspend evenly;

[0082] Step S5: Take an appropriate amount of the pulp obtained in step S4 and pour it into the paper curtain. Then slowly place the paper curtain into a clean, flowing water tank to distribute the pulp evenly in the paper curtain. Then slowly lift the paper curtain to drain the water.

[0083] Step S6: Let the paper curtain dry in the sun. Before it is completely dry, peel off the paper to reveal the hidden paper.

[0084] Comparative Example 2

[0085] Preparation process of a mineral-containing plant fiber Tibetan paper

[0086] Step S1: Take the roots of the wolfsbane, soak them in water for 1 day to remove the soil, then crush the roots with a hammer, remove the fibrous tissue between the outer skin and the inner stem, and dry them completely in the sun.

[0087] Step S2: Take 2.5 kg of the fibrous tissue obtained in step S1 and 0.1 kg of sodium carbonate and heat it with 2.5 kg of water while stirring. After heating to boiling, maintain a gentle boil for 2 hours without adding water.

[0088] Step S3: Remove the product from step S2, squeeze out the water, and pound it for 1 hour;

[0089] Step S4: Add water to the product from step S3 and stir to make the pulp suspend evenly;

[0090] Step S5: Mix the pulp and talc obtained in step S4 at a mass ratio of 100:3, then pour an appropriate amount into the paper curtain. Slowly place the paper curtain into a clean, flowing water tank to distribute the pulp evenly in the paper curtain. Then slowly lift the paper curtain to drain the water.

[0091] Step S6: Let the paper curtain dry in the sun. Before it is completely dry, peel off the paper to reveal the hidden paper.

[0092] Comparative Example 3

[0093] Preparation process of a mineral-containing plant fiber Tibetan paper

[0094] Step S1: Take the roots of the wolfsbane, soak them in water for 1 day to remove the soil, then crush the roots with a hammer, remove the fibrous tissue between the outer skin and the inner stem, and dry them completely in the sun.

[0095] Step S2: Take 2.5 kg of the fibrous tissue obtained in step S1 and 0.1 kg of sodium carbonate and heat it with 2.5 kg of water while stirring. After heating to boiling, maintain a gentle boil for 2 hours without adding water.

[0096] Step S3: Remove the product from step S2, squeeze out the water, and pound it for 1 hour;

[0097] Step S4: Add water to the product from step S3 and stir to make the pulp suspend evenly;

[0098] Step S5: Mix the pulp obtained in step S4 and chitosan-modified talc at a mass ratio of 100:3, then pour an appropriate amount into the paper curtain. Slowly place the paper curtain into a clean, flowing water tank to distribute the pulp evenly in the paper curtain. Then slowly lift the paper curtain to drain the water.

[0099] Step S6: Let the paper curtain dry in the sun. Before it is completely dry, peel off the paper to reveal the hidden paper.

[0100] The preparation method for chitosan-modified talc is the same as in Example 1.

[0101] Test case

[0102] The tensile strength and aging tensile strength of the paper prepared according to each embodiment and resistance were measured. The tensile strength was tested according to GB / T453-2002, with a pretension of 9.8 N, and the initial tensile strength was measured. The aging tensile strength was measured after the paper was placed in an oven at 105 degrees Celsius for 72 hours.

[0103] Table 1

[0104]

[0105]

[0106] As shown in Table 1, Examples 1-5 demonstrate that the addition of chitosan-modified talc and calcium chloride to the pulp improves both the paper's strength and its resistance to aging. By composited with chitosan on the talc surface, hydrogen bonds are formed between the pulp fibers, improving the bond between talc and fibers. This results in a significant increase in the tensile strength of paper prepared using modified talc compared to paper filled with pure talc. Simultaneously, the presence of calcium chloride allows for greater adsorption of chitosan-modified talc onto the fibers, further enhancing the paper's resistance to aging.

[0107] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A mineral-containing vegetable fiber banknote, characterized by, The paper pulp is prepared by using the root system of the Stellera chamaejasme L as the fiber raw material, and adding chitosan modified talc and calcium chloride in the paper pulp. The preparation method of the chitosan modified talc comprises the following steps: S11, dispersing talc into deionized water; S12, dispersing chitosan into acetic acid water, the volume ratio of acetic acid to water in the acetic acid water is 5:95, and then stirring for 20 min; S13, mixing the products of the steps S11 and S12 together, adjusting the pH to 10 by using sodium hydroxide, and then stirring for 10 min, filtering to obtain a precipitate, and vacuum drying the precipitate at 50 DEG C.

2. A mineral-containing plant fiber banknote according to claim 1, characterized in that, The mass ratio of the paper pulp, the chitosan modified talc and the calcium chloride in the paper pulp is 100:1-5:0.

5.

3. A mineral-containing plant fiber banknote according to claim 2, characterized in that, The mass ratio of the paper pulp, the chitosan modified talc and the calcium chloride in the paper pulp is 100:3-5:0.

5.

4. A mineral-containing plant fiber banknote according to claim 3, characterized in that, The mass ratio of the paper pulp, the chitosan modified talc and the calcium chloride in the paper pulp is 100:3:0.

5.

5. A mineral containing plant fiber banknote according to claim 1, characterized in that, The mass ratio of the talc in the step S11 to the chitosan in the step S12 is 5:0.

5.

6. A process for the preparation of a mineral-containing vegetable fibre paper according to any one of claims 1 to 4, characterised in that, The method comprises the following steps: S1, taking the root system of the Stellera chamaejasme L, soaking in water for 1 day, removing the soil, and then crushing the root system by using an iron hammer, taking out the fiber tissue between the outer skin and the inner stem, and completely drying the fiber tissue in the sun; S2, taking 2.5 kg of the fiber tissue obtained in the step S1, 0.1 kg of sodium carbonate and 2.5 kg of water, heating and stirring, heating to boiling, and keeping the state of slight boiling for 2 h without adding water during the process; S3, taking out the product of the step S2, squeezing out the water, and beating for 1 h; S4, adding water to the product of the step S3, and stirring to make the paper pulp uniformly suspended; S5, uniformly mixing the paper pulp, the chitosan modified talc and the anhydrous calcium chloride obtained in the step S4, pouring the mixture into a paper screen, slowly putting the paper screen into a clean flowing water pool, making the paper pulp uniformly distributed in the paper screen, and then slowly lifting the paper screen to drain the water; S6, airing the paper screen, and taking off the paper before completely drying to obtain the mineral-containing plant fiber paper.

7. A process for the preparation of a mineral substance-containing vegetable fibre paper according to claim 6, characterised in that, The mass ratio of the fiber tissue to the sodium carbonate in the step S2 is 2.5:0.

1.

8. The application of the mineral-containing plant fiber paper in the field of writing, drawing and tie-dyeing according to any one of claims 1-4.

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