Full-degradable fiberboard and preparation method thereof

Abstract

The invention relates to the technical field of full-degradable fiberboards, in particular to a full-degradable fiberboard which comprises a full-degradable fiberboard body. The composite material is prepared from the following components in parts by weight: 20-30 parts of plant fibers, 12-17 parts of starch-based resin, 6-10 parts of polylactic acid, 4-9 parts of polyhydroxyalkanoate, 4-8 parts of cellulose nanofibers, 3-7 parts of terpene resin, 2-5 parts of an anti-aging agent, 4-8 parts of cellulose decomposition bacteria, 5-11 parts of rosin, 3-6 parts of citric acid and 2-4 parts of malic acid. An anti-aging agent is added in the manufacturing process of the fiberboard, so that the manufactured fiberboard has good anti-aging capacity and improved use durability after being applied to the insole and being continuously used or cleaned, a fiberboard wet blank is obtained through the procedures of pulping and the like in cooperation with a papermaking technology, and then the fiberboard wet blank is prepared through the methods of squeezing and the like. The density of the fiberboard can be guaranteed, the fiberboard is made of environment-friendly materials, the fiberboard can be decomposed after being discarded, and harm to the environment is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of fully degradable fiberboards, and in particular to a fully degradable fiberboard and a preparation method thereof. Background Art

[0002] Fiberboard is widely used inside shoes, and its fiberboard is mainly used to provide support, protection and structural stability.

[0003] They are usually made from paper fibers and are pressed, cut and formed to meet specific needs.

[0004] This type of paper fiber can be made through the papermaking process. Papermaking technology can efficiently separate the cellulose in the raw materials through the steps of scouring, pulping, screening and purification to obtain high-quality paper fibers. Modern papermaking technology pays attention to environmental protection and adopts recycling and energy-saving and emission reduction measures to reduce pollution to the environment. Papermaking technology can use a variety of raw materials to make paper fibers, including wood, waste paper, cotton, hemp, etc., which makes paper production more flexible and economical.

[0005] However, since this type of fiberboard built into the bottom of the shoe will add some difficult-to-degrade plastic or rubber materials to increase its supporting strength, the fiberboard is difficult to degrade after the shoe is discarded. At the same time, some shoes with fiberboard linings will be regularly cleaned and dried, and the fiberboard's anti-aging ability needs to be improved to avoid cracking after regular cleaning. Summary of the invention

[0006] The purpose of the present invention is to solve the above-mentioned shortcomings in the prior art and to propose a fully degradable fiberboard and a preparation method.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A fully degradable fiberboard is designed, comprising the fully degradable fiberboard, which comprises, by weight: 20-30 parts of plant fiber, 12-17 parts of starch-based resin, 6-10 parts of polylactic acid, 4-9 parts of polyhydroxyalkanoate, 4-8 parts of cellulose nanofiber, 3-7 parts of terpene resin, 2-5 parts of anti-aging agent, 4-8 parts of cellulose decomposing bacteria, 5-11 parts of rosin, 3-6 parts of citric acid and 2-4 parts of malic acid.

[0009] In detail, the preparation method of the fully degradable fiberboard is as follows:

[0010] Step 1: Select suitable plant fibers, chip, refine and screen them to separate and extract fibers;

[0011] Step 2: Bleaching and drying the extracted fibers to improve their purity and suitability;

[0012] Step 3: Mix the treated fibers with starch-based resin, polylactic acid, polyhydroxyalkanoate, cellulose nanofibers, terpene resin, antioxidant, cellulose decomposing bacteria, rosin, citric acid, and malic acid to form a uniform slurry;

[0013] Step 4: Add a certain amount of water and antioxidant to adjust the fluidity and anti-aging properties of the slurry;

[0014] Step 5: Pour the processed slurry into the molding machine, and drain the water from the slurry through the filter screen to form a wet fiberboard embryo. Through pressing, further remove the water to obtain a fiberboard embryo with a higher density. During the pressing process, the resin will penetrate between the fibers to form a strong bond.

[0015] Step 6: Curing the formed fiberboard under certain temperature and humidity conditions to fully cross-link and harden the resin;

[0016] Step 7: By drying the fiberboard, moisture is removed from the fiberboard, improving its stability and strength.

[0017] Specifically, the plant fibers include wood fibers, bamboo fibers, grass fibers and hemp fibers, among which bamboo fibers are preferred.

[0018] In detail, the anti-aging agent includes any one of 2,6-di-tert-butyl-p-cresol or tert-butyl-hydroquinone.

[0019] In detail, the fiber length after refining in the first step is 6-20 microns.

[0020] In detail, the fiber bleaching in the second step includes the control of temperature, time and pH value. The temperature is generally 25-100 degrees, the time is 5-30 minutes, and the pH value is 7-13.

[0021] In detail, the amount of water added in the fourth step is such that the concentration of the slurry is 0.5%-2%.

[0022] In detail, the extrusion strength of the slurry in the fifth step is controlled between 20 and 30 MPa.

[0023] In detail, the curing temperature in the sixth step is controlled between 25 and 180 degrees, and the curing humidity is 40%-70%.

[0024] In detail, the drying method in the seventh step is preferably natural drying or hot air drying.

[0025] The technical solution proposed by the present invention has the following beneficial effects:

[0026] 1. By adding anti-aging agents during the production process of fiberboard, the fiberboard produced has good anti-aging ability when applied to the midsole of shoes and after continuous use or cleaning, thereby improving the durability of use;

[0027] 2. Through the pulping process of papermaking, the wet fiberboard embryo is obtained, and then combined with pressing and other methods, the density of the fiberboard can be guaranteed. The fiberboard uses environmentally friendly materials and can be decomposed after being discarded, reducing damage to the environment. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] Example 1

[0030] A fully degradable fiberboard comprises the following components, by weight: 30 parts of plant fiber, 17 parts of starch-based resin, 10 parts of polylactic acid, 8 parts of polyhydroxyalkanoate, 7 parts of cellulose nanofiber, 5 parts of terpene resin, 5 parts of anti-aging agent, 5 parts of cellulose decomposing bacteria, 7 parts of rosin, 3 parts of citric acid and 3 parts of malic acid.

[0031] Cellulose nanofibers can enhance the physical properties of fiberboard and may help increase the degradation rate of the material due to its size effect;

[0032] Rosin and terpene resins can increase the biodegradability of fiberboard. These resins are more easily decomposed by microorganisms in the natural environment.

[0033] Microbial flora can promote the decomposition of components such as cellulose and lignin;

[0034] Citric acid and malic acid can promote the activity of microorganisms, thereby accelerating the degradation process of fiberboard.

[0035] It should be further explained that the preparation method of the fully degradable fiberboard is as follows:

[0036] Step 1: Select suitable plant fibers, chip, refine and screen them to separate and extract fibers;

[0037] Step 2: Bleaching and drying the extracted fibers to improve their purity and suitability;

[0038] Step 3: Mix the treated fibers with starch-based resin, polylactic acid, polyhydroxyalkanoate, cellulose nanofibers, terpene resin, antioxidant, cellulose decomposing bacteria, rosin, citric acid, and malic acid to form a uniform slurry;

[0039] Step 4: Add a certain amount of water and antioxidant to adjust the fluidity and anti-aging properties of the slurry;

[0040] When adding antioxidants to the pulp, it is necessary to ensure that the antioxidants are added in the precise proportion required by the formula or process. An appropriate stirring speed is necessary. Too high a stirring speed may cause damage to the pulp fibers, while too low a speed may cause uneven mixing. Some antioxidants may be sensitive to temperature. Ensure that the temperature is controlled during the mixing process to avoid affecting the effect of the antioxidant due to too high or too low temperature. The effectiveness of some antioxidants may be affected by the pH value, so it is very important to monitor and adjust the pH value of the pulp during the mixing process.

[0041] Step 5: Pour the processed slurry into the molding machine, and drain the water from the slurry through the filter screen to form a wet fiberboard embryo. Through pressing, further remove the water to obtain a fiberboard embryo with a higher density. During the pressing process, the resin will penetrate between the fibers to form a strong bond.

[0042] Step 6: Curing the formed fiberboard under certain temperature and humidity conditions to fully cross-link and harden the resin;

[0043] During the curing process, appropriate pressure helps the resin to be evenly distributed and penetrate into the fibers, thereby improving the density and strength of the fiberboard. Too much or too little pressure may affect the quality of the final product. The curing time should be long enough to ensure that the resin is completely cured. If the curing time is too short, the resin may not be cured thoroughly, affecting the mechanical properties and durability of the fiberboard. The curing time is usually closely related to the curing temperature. The higher the temperature, the shorter the time required.

[0044] Step 7: By drying the fiberboard, moisture is removed from the fiberboard, improving its stability and strength.

[0045] It should be further explained that plant fibers include wood fibers, bamboo fibers, grass fibers and hemp fibers, among which bamboo fibers are preferred.

[0046] It should be further explained that the anti-aging agent includes any one of 2,6-di-tert-butyl-p-cresol or tert-butylhydroquinone.

[0047] It should be further explained that the fiber length after refining in the first step is 6-20 microns.

[0048] It should be further explained that the fiber bleaching in the second step involves the control of temperature, time and pH value. The temperature is generally 25-100 degrees, the time is 5-30 minutes, and the pH value is 7-13.

[0049] It should be further explained that the amount of water added in the fourth step is such that the concentration of the slurry is 0.5%-2%.

[0050] It should be further explained that the extrusion strength of the slurry in the fifth step is controlled between 20 and 30 MPa.

[0051] It should be further explained that the curing temperature in the sixth step is controlled between 25 and 180 degrees, and the curing humidity is 40%-70%.

[0052] It should be further explained that the drying method in the seventh step is preferably natural drying or hot air drying.

[0053] Example 2

[0054] A fully degradable fiberboard comprises the following components, by weight: 25 parts of plant fiber, 15 parts of starch-based resin, 10 parts of polylactic acid, 10 parts of polyhydroxyalkanoate, 7 parts of cellulose nanofiber, 5 parts of terpene resin, 5 parts of anti-aging agent, 5 parts of cellulose decomposing bacteria, 10 parts of rosin, 5 parts of citric acid and 3 parts of malic acid.

[0055] It should be further explained that the preparation method of the fully degradable fiberboard is as follows:

[0056] Step 1: Select suitable plant fibers, chip, refine and screen them to separate and extract fibers;

[0057] Step 2: Bleaching and drying the extracted fibers to improve their purity and suitability;

[0058] Step 3: Mix the treated fibers with starch-based resin, polylactic acid, polyhydroxyalkanoate, cellulose nanofibers, terpene resin, antioxidant, cellulose decomposing bacteria, rosin, citric acid, and malic acid to form a uniform slurry;

[0059] Step 4: Add a certain amount of water and antioxidant to adjust the fluidity and anti-aging properties of the slurry;

[0060] Step 5: Pour the processed slurry into the molding machine, and drain the water from the slurry through the filter screen to form a wet fiberboard embryo. Through pressing, further remove the water to obtain a fiberboard embryo with a higher density. During the pressing process, the resin will penetrate between the fibers to form a strong bond.

[0061] Step 6: Curing the formed fiberboard under certain temperature and humidity conditions to fully cross-link and harden the resin;

[0062] Step 7: By drying the fiberboard, moisture is removed from the fiberboard, improving its stability and strength.

[0063] It should be further explained that plant fibers include wood fibers, bamboo fibers, grass fibers and hemp fibers, among which bamboo fibers are preferred.

[0064] It should be further explained that the anti-aging agent includes any one of 2,6-di-tert-butyl-p-cresol or tert-butylhydroquinone.

[0065] It should be further explained that the fiber length after refining in the first step is 6-20 microns.

[0066] It should be further explained that the fiber bleaching in the second step involves the control of temperature, time and pH value. The temperature is generally 25-100 degrees, the time is 5-30 minutes, and the pH value is 7-13.

[0067] It should be further explained that the amount of water added in the fourth step is such that the concentration of the slurry is 0.5%-2%.

[0068] It should be further explained that the extrusion strength of the slurry in the fifth step is controlled between 20 and 30 MPa.

[0069] It should be further explained that the curing temperature in the sixth step is controlled between 25 and 180 degrees, and the curing humidity is 40%-70%.

[0070] It should be further explained that the drying method in the seventh step is preferably natural drying or hot air drying.

[0071] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A fully degradable fiberboard, comprising a fully degradable fiberboard, characterized in that: Calculated by weight: 20-30 parts of plant fiber, 12-17 parts of starch-based resin, 6-10 parts of polylactic acid, 4-9 parts of polyhydroxyalkanoate, 4-8 parts of cellulose nanofibers, 3-7 parts of terpene resin, 2-5 parts of antioxidant, 4-8 parts of cellulose-decomposing bacteria, 5-11 parts of rosin, 3-6 parts of citric acid, and 2-4 parts of malic acid.

2. The fully degradable fiberboard and the preparation method thereof according to claim 1, characterized in that: The preparation method of the fully degradable fiberboard is as follows: Step 1: Select suitable plant fibers, chip, refine and screen them to separate and extract fibers; Step 2: Bleaching and drying the extracted fibers to improve their purity and suitability; Step 3: Mix the treated fibers with starch-based resin, polylactic acid, polyhydroxyalkanoate, cellulose nanofibers, terpene resin, antioxidant, cellulose decomposing bacteria, rosin, citric acid, and malic acid to form a uniform slurry; Step 4: Add a certain amount of water and antioxidant to adjust the fluidity and anti-aging properties of the slurry; Step 5: Pour the processed slurry into the molding machine, and drain the water from the slurry through the filter screen to form a wet fiberboard embryo. Through pressing, further remove the water to obtain a fiberboard embryo with a higher density. During the pressing process, the resin will penetrate between the fibers to form a strong bond. Step 6: Curing the formed fiberboard under certain temperature and humidity conditions to fully cross-link and harden the resin; Step 7: By drying the fiberboard, moisture is removed from the fiberboard, improving its stability and strength.

3. The fully degradable fiberboard and the preparation method thereof according to claim 2, characterized in that: The plant fibers include wood fibers, bamboo fibers, grass fibers and hemp fibers, among which bamboo fibers are preferred.

4. The fully degradable fiberboard and the preparation method thereof according to claim 2, characterized in that: The anti-aging agent includes any one of 2,6-di-tert-butyl-p-cresol or tert-butyl-hydroquinone.

5. The fully degradable fiberboard and the preparation method thereof according to claim 2, characterized in that: The fiber length after refining in the first step is 6-20 microns.

6. The fully degradable fiberboard and the preparation method thereof according to claim 2, characterized in that: The fiber bleaching in the second step includes the control of temperature, time and pH value. The temperature is generally 25-100 degrees, the time is 5-30 minutes, and the pH value is 7-13.

7. The fully degradable fiberboard and the preparation method thereof according to claim 2, characterized in that: The amount of water added in the fourth step is such that the concentration of the slurry is 0.5%-2%.

8. The fully degradable fiberboard and the preparation method thereof according to claim 2, characterized in that: The extrusion strength of the slurry in the fifth step is controlled between 20 and 30 MPa.

9. The fully degradable fiberboard and the preparation method thereof according to claim 2, characterized in that: The curing temperature in the sixth step is controlled between 25 and 180 degrees, and the curing humidity is 40%-70%.

10. The fully degradable fiberboard and the preparation method thereof according to claim 2, characterized in that: The drying method in the seventh step is preferably natural drying or hot air drying.