Environment-friendly decorative base paper and preparation method thereof

Abstract

The application discloses an environment-friendly decorative base paper and a preparation method thereof, and comprises the following steps: preparing a pretreated microfibrillated cellulose dispersion solution; adding the pretreated microfibrillated cellulose dispersion solution into a titanium dioxide suspension, stirring, and separating to obtain a nanocellulose composite material; adding mixed wood pulp plates and the nanocellulose composite material into distilled water and soaking; using a defibrator and a refiner in series to free beating of the soaked materials to obtain mixed pulp; adding dodecyl bis-hydroxyethyl methyl ammonium chloride and polyamide epichlorohydrin into the mixed pulp, uniformly mixing, forming, pressing, drying, and obtaining the decorative base paper. The microfibrillated cellulose after modification is compounded with the titanium dioxide suspension, which is more uniform and stable, so that the prepared decorative base paper has more excellent performance, the prepared decorative base paper has high tightness, excellent longitudinal tensile strength and high tearing strength performance, and is a kind of decorative base paper with excellent performance.

Description

Technical Field

[0001] This invention belongs to the field of decorative base paper manufacturing technology, specifically relating to an environmentally friendly decorative base paper and its preparation method. Background Technology

[0002] Decorative base paper is a special industrial paper made from high-quality wood pulp and titanium dioxide as main raw materials through a special process. After printing and resin impregnation, it is mainly used as the facing paper, surface paper, and bottom layer paper for fiberboard, particleboard, and other engineered wood products. Therefore, in the engineered wood product industry, the impregnated decorative base paper is called melamine paper. Various decorative materials made from engineered wood products laminated with melamine paper have excellent properties such as heat insulation, flame retardancy, non-warping, crack resistance, and easy cleaning. They also come in a wide variety of colors and patterns, are rich and beautiful, have bright and vibrant colors, and a strong sense of layering. They are widely used in mid-to-high-end building decoration and renovation in hotels, shopping malls, office buildings, and various entertainment and cultural venues, as well as in home decoration and renovation, furniture and engineered wood flooring manufacturing, and interior decoration of transportation vehicles. It is a fashionable and environmentally friendly material that "replaces plastic with paper and wood with paper." Decorative base paper can be divided into solid color decorative base paper, printable binding base paper, surface wear-resistant base paper, balancing base paper, and edge-sealing decorative base paper according to its application characteristics and uses.

[0003] Adding titanium dioxide filler during the preparation of decorative base paper not only results in paper with excellent whiteness and gloss, but also makes it thin, smooth, highly printable, non-penetrating, and lightweight. The content and distribution of titanium dioxide in the paper determine the opacity of the decorative base paper; higher content and more uniform distribution lead to higher opacity. However, titanium dioxide has small particle size, high specific gravity, fast settling speed, and large specific surface area. Existing filling methods result in poor dispersion of titanium dioxide in the pulp, leading to aggregation and affecting the opacity of the finished paper. The uneven distribution of pigment reduces the paper's opacity, necessitating compensation by increasing the amount of pigment used. However, during the papermaking process, titanium dioxide retention is low and loss is high; excessive pigment addition can negatively impact paper strength and other properties.

[0004] One of the many uses or applications of cellulose nanomaterials is to improve or enhance the strength and quality of various paper products. In the manufacturing process, nanocellulose can be introduced and compounded with titanium dioxide to prepare composite materials, which can then be added to the preparation of decorative base paper to improve the distribution of titanium dioxide in the pulp, thereby enhancing the performance of the decorative base paper. Summary of the Invention

[0005] One object of the present invention is to solve at least the above-mentioned problems and / or defects, and to provide at least the advantages described below.

[0006] To achieve these objectives and other advantages according to the present invention, a method for preparing an environmentally friendly decorative base paper is provided, comprising the following steps:

[0007] Step 1: Add microfibrillated cellulose to water, then add sodium dodecylbenzenesulfonate and stir to obtain a pretreated microfibrillated cellulose dispersion; add the pretreated microfibrillated cellulose dispersion to a titanium dioxide suspension, stir, and separate to obtain a nanocellulose composite material;

[0008] Step 2: Add the mixed wood pulp board and nanocellulose composite material to distilled water and soak.

[0009] Step 3: The material soaked in Step 2 is subjected to free pulping using a dewatering machine and a pulping machine connected in series to obtain a mixed pulp;

[0010] Step 4: Add dodecyl dihydroxyethyl methyl ammonium chloride and polyamide epichlorohydrin to the mixed pulp, mix evenly, form into paper, press, and dry to obtain decorative base paper.

[0011] Preferably, in step one, the microfibrillated cellulose is modified by taking microfibrillated cellulose, deionized water, polyaspartic acid and glutaraldehyde, subjecting them to an ultrasonic reaction at high temperature, drying, and pulverizing to obtain modified microfibrillated cellulose.

[0012] Preferably, the mass ratio of microfibrillated cellulose to deionized water is 1:30-45; the mass ratio of microfibrillated cellulose to polyaspartic acid is 1:15-25; the mass ratio of microfibrillated cellulose to glutaraldehyde is 1:0.1-1.5; the temperature for applying the ultrasonic reaction at high temperature is 65-80°C, the reaction time is 1.5-2.5 hours; the ultrasonic power is 800-1000W, the ultrasonic frequency is 35-45KHz; and the drying temperature is 60-80°C.

[0013] Preferably, in step one, the microfibrillated cellulose is modified by adding microfibrillated cellulose, deionized water, polyaspartic acid and glutaraldehyde into a microwave-ultrasonic integrated reactor, simultaneously turning on the microwave and ultrasonic waves, and performing a synergistic treatment reaction at a temperature of 65-80°C for 45-60 minutes, followed by drying and pulverization to obtain modified microfibrillated cellulose.

[0014] Preferably, the mass ratio of microfibrillated cellulose to deionized water is 1:30-45; the mass ratio of microfibrillated cellulose to polyaspartic acid is 1:15-25; the mass ratio of microfibrillated cellulose to glutaraldehyde is 1:0.1-1.5; the microwave power of the synergistic treatment reaction is 500-800W, the ultrasonic power is 800-1000W, the ultrasonic frequency is 35-45KHz; and the drying temperature is 60-80℃.

[0015] Preferably, in step one, the mass ratio of microfibrillated cellulose to water is 1:20-30; the mass ratio of microfibrillated cellulose to sodium dodecylbenzenesulfonate is 100-300:1; the stirring time is 30-60 min, and the stirring speed is 500-1000 r / min.

[0016] Preferably, in step one, the mass ratio of the pretreated microfibrillated cellulose dispersion to the titanium dioxide suspension is 1:0.2-0.6; the titanium dioxide suspension is prepared by mixing 1-5 parts by weight of titanium dioxide, 3-5 parts by weight of melamine, 10-15 parts by weight of urea and 80-100 parts by weight of water, stirring to obtain the titanium dioxide suspension; the stirring speed is 500-1000 r / min.

[0017] Preferably, in step two, the mixed wood pulp board is obtained by blending softwood pulp board and hardwood pulp board; the content of hardwood pulp board in the mixed wood pulp board is 60-70 wt%; the amount of mixed wood pulp board added is 10-15 wt% of distilled water, and the amount of nanocellulose composite material added is 15-25 wt% of the mixed wood pulp board; the soaking temperature is 25-30℃, and the soaking time is 12-36 hours.

[0018] Preferably, in step three, the pulp is beaten to 35-45°SR; in step four, the amount of dodecyl dihydroxyethyl methyl ammonium chloride added is 0.8-1.5 wt% of the mixed wood pulp board, and the amount of polyamide epichlorohydrin mixed wood pulp board is 1-2 wt%.

[0019] The present invention also provides an environmentally friendly decorative base paper prepared according to the above preparation method.

[0020] The present invention has at least the following beneficial effects: The present invention uses polyaspartic acid and glutaraldehyde to modify microfibrillated cellulose. The surface morphology and functional groups of the modified microfibrillated cellulose change, making its composite with titanium dioxide suspension more uniform and stable. As a result, the decorative base paper prepared is of better performance. The decorative base paper prepared using this nanocellulose composite material has high density, excellent longitudinal tensile strength, and high tear strength, making it a high-performance decorative base paper.

[0021] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Detailed implementation method:

[0022] The present invention will now be described in further detail so that those skilled in the art can implement it based on the description.

[0023] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not imply the presence or addition of one or more other elements or combinations thereof.

[0024] Example 1:

[0025] A method for preparing an environmentally friendly decorative base paper includes the following steps:

[0026] Step 1: Add 1 kg of microfibrillated cellulose to 20 kg of water, then add 0.01 kg of sodium dodecylbenzenesulfonate, and stir at 500 r / min for 30 min to obtain a pretreated microfibrillated cellulose dispersion; add 1 kg of the pretreated microfibrillated cellulose dispersion to 0.5 kg of titanium dioxide suspension, stir at 1000 r / min for 90 min, and separate to obtain nanocellulose composite material; the titanium dioxide suspension is prepared by mixing 2 kg of titanium dioxide, 3 kg of melamine, 10 kg of urea and 100 kg of deionized water, stirring to obtain a titanium dioxide suspension;

[0027] Step 2: Add the mixed wood pulp board and nanocellulose composite material to distilled water and soak at 28°C for 24 hours; the mixed wood pulp board is a blend of softwood pulp board and hardwood pulp board; the content of hardwood pulp board in the mixed wood pulp board is 60wt%; the amount of mixed wood pulp board added is 10wt% of distilled water, and the amount of nanocellulose composite material added is 20wt% of the mixed wood pulp board;

[0028] Step 3: The material soaked in Step 2 is subjected to free pulping using a dewatering machine and a pulping machine in series, and pulped to 40°SR to obtain a mixed pulp.

[0029] Step 4: Add dodecyl dihydroxyethyl methyl ammonium chloride and polyamide epichlorohydrin to the mixed pulp, mix evenly, form into paper, press, and dry to obtain decorative base paper; the amount of dodecyl dihydroxyethyl methyl ammonium chloride added is 1 wt% of the mixed wood pulp board, and the amount of polyamide epichlorohydrin added is 1.5 wt% of the mixed wood pulp board.

[0030] Example 2:

[0031] A method for preparing an environmentally friendly decorative base paper includes the following steps:

[0032] Step 1: Take 1 kg of microfibrillated cellulose, 30 kg of deionized water, 15 kg of polyaspartic acid and 0.5 kg of glutaraldehyde, apply ultrasonic reaction at 70℃ for 2 hours, dry at 80℃, and pulverize to obtain modified microfibrillated cellulose; the ultrasonic power is 800 W and the ultrasonic frequency is 35 kHz.

[0033] 1 kg of modified microfibrillated cellulose was added to 20 kg of water, then 0.01 kg of sodium dodecylbenzenesulfonate was added, and the mixture was stirred at 500 r / min for 30 min to obtain a pretreated modified microfibrillated cellulose dispersion. 1 kg of the pretreated modified microfibrillated cellulose dispersion was added to 0.5 kg of titanium dioxide suspension, and the mixture was stirred at 1000 r / min for 90 min. After separation, nanocellulose composite material was obtained. The titanium dioxide suspension was prepared by mixing 2 kg of titanium dioxide, 3 kg of melamine, 10 kg of urea, and 100 kg of deionized water, and stirring to obtain a titanium dioxide suspension.

[0034] Step 2: Add the mixed wood pulp board and nanocellulose composite material to distilled water and soak at 28°C for 24 hours; the mixed wood pulp board is a blend of softwood pulp board and hardwood pulp board; the content of hardwood pulp board in the mixed wood pulp board is 60wt%; the amount of mixed wood pulp board added is 10wt% of distilled water, and the amount of nanocellulose composite material added is 20wt% of the mixed wood pulp board;

[0035] Step 3: The material soaked in Step 2 is subjected to free pulping using a dewatering machine and a pulping machine in series, and pulped to 40°SR to obtain a mixed pulp.

[0036] Step 4: Add dodecyl dihydroxyethyl methyl ammonium chloride and polyamide epichlorohydrin to the mixed pulp, mix evenly, form into paper, press, and dry to obtain decorative base paper; the amount of dodecyl dihydroxyethyl methyl ammonium chloride added is 1 wt% of the mixed wood pulp board, and the amount of polyamide epichlorohydrin added is 1.5 wt% of the mixed wood pulp board.

[0037] Example 3:

[0038] A method for preparing an environmentally friendly decorative base paper includes the following steps:

[0039] Step 1: Take 1 kg of microfibrillated cellulose, 30 kg of deionized water, 15 kg of polyaspartic acid, and 0.5 kg of glutaraldehyde and add them to a microwave-ultrasound integrated reactor. Simultaneously turn on the microwave and ultrasound, and carry out a synergistic treatment reaction at 70°C for 60 min. Dry at 80°C, pulverize, and obtain modified microfibrillated cellulose. The microwave power of the synergistic treatment reaction is 800 W, the ultrasound power is 800 W, and the ultrasound frequency is 35 kHz.

[0040] 1 kg of modified microfibrillated cellulose was added to 20 kg of water, then 0.01 kg of sodium dodecylbenzenesulfonate was added, and the mixture was stirred at 500 r / min for 30 min to obtain a pretreated modified microfibrillated cellulose dispersion. 1 kg of the pretreated modified microfibrillated cellulose dispersion was added to 0.5 kg of titanium dioxide suspension, and the mixture was stirred at 1000 r / min for 90 min. After separation, nanocellulose composite material was obtained. The titanium dioxide suspension was prepared by mixing 2 kg of titanium dioxide, 3 kg of melamine, 10 kg of urea, and 100 kg of deionized water, and stirring to obtain a titanium dioxide suspension.

[0041] Step 2: Add the mixed wood pulp board and nanocellulose composite material to distilled water and soak at 28°C for 24 hours; the mixed wood pulp board is a blend of softwood pulp board and hardwood pulp board; the content of hardwood pulp board in the mixed wood pulp board is 60wt%; the amount of mixed wood pulp board added is 10wt% of distilled water, and the amount of nanocellulose composite material added is 20wt% of the mixed wood pulp board;

[0042] Step 3: The material soaked in Step 2 is subjected to free pulping using a dewatering machine and a pulping machine in series, and pulped to 40°SR to obtain a mixed pulp.

[0043] Step 4: Add dodecyl dihydroxyethyl methyl ammonium chloride and polyamide epichlorohydrin to the mixed pulp, mix evenly, form into paper, press, and dry to obtain decorative base paper; the amount of dodecyl dihydroxyethyl methyl ammonium chloride added is 1 wt% of the mixed wood pulp board, and the amount of polyamide epichlorohydrin added is 1.5 wt% of the mixed wood pulp board.

[0044] Example 4:

[0045] In the process of preparing nanocellulose composite materials, the inventors found that the effect of simply stirring the pretreated microfibrillated cellulose dispersion and titanium dioxide suspension was not ideal, as the titanium dioxide suspension could not be evenly distributed in the pretreated microfibrillated cellulose dispersion. Therefore, the inventors added the pretreated microfibrillated cellulose dispersion and titanium dioxide suspension to a high-pressure reactor and introduced high-pressure CO2. By forming supercritical CO2 carbon dioxide, the titanium dioxide suspension was evenly distributed in the pretreated microfibrillated cellulose dispersion. Furthermore, during the gradual depressurization process, the composite of the titanium dioxide suspension and the pretreated microfibrillated cellulose dispersion became more stable, thereby resulting in a nanocellulose composite material with superior performance.

[0046] A method for preparing an environmentally friendly decorative base paper includes the following steps:

[0047] Step 1: Add 1 kg of microfibrillated cellulose to 20 kg of water, then add 0.01 kg of sodium dodecylbenzenesulfonate, and stir at 500 r / min for 30 min to obtain a pretreated modified microfibrillated cellulose dispersion; add 1 kg of the pretreated modified microfibrillated cellulose dispersion to 0.5 kg of titanium dioxide suspension and add it to a high-pressure reactor, inject high-pressure carbon dioxide into the reactor, and stir at 45℃, 25 MPa, and 1000 r / min for 90 min, then depressurize at 1 MPa / min and separate to obtain nanocellulose composite material; the titanium dioxide suspension is prepared by mixing 2 kg of titanium dioxide, 3 kg of melamine, 10 kg of urea and 100 kg of deionized water, stirring to obtain a titanium dioxide suspension;

[0048] Step 2: Add the mixed wood pulp board and nanocellulose composite material to distilled water and soak at 28°C for 24 hours; the mixed wood pulp board is a blend of softwood pulp board and hardwood pulp board; the content of hardwood pulp board in the mixed wood pulp board is 60wt%; the amount of mixed wood pulp board added is 10wt% of distilled water, and the amount of nanocellulose composite material added is 20wt% of the mixed wood pulp board;

[0049] Step 3: The material soaked in Step 2 is subjected to free pulping using a dewatering machine and a pulping machine in series, and pulped to 40°SR to obtain a mixed pulp.

[0050] Step 4: Add dodecyl dihydroxyethyl methyl ammonium chloride and polyamide epichlorohydrin to the mixed pulp, mix evenly, form into paper, press, and dry to obtain decorative base paper; the amount of dodecyl dihydroxyethyl methyl ammonium chloride added is 1 wt% of the mixed wood pulp board, and the amount of polyamide epichlorohydrin added is 1.5 wt% of the mixed wood pulp board.

[0051] Example 5:

[0052] A method for preparing an environmentally friendly decorative base paper includes the following steps:

[0053] Step 1: Take 1 kg of microfibrillated cellulose, 30 kg of deionized water, 15 kg of polyaspartic acid and 0.5 kg of glutaraldehyde, apply ultrasonic reaction at 70℃ for 2 hours, dry at 80℃, and pulverize to obtain modified microfibrillated cellulose; the ultrasonic power is 800 W and the ultrasonic frequency is 35 kHz.

[0054] 1 kg of modified microfibrillated cellulose was added to 20 kg of water, followed by 0.01 kg of sodium dodecylbenzenesulfonate. The mixture was stirred at 500 r / min for 30 min to obtain a pretreated microfibrillated cellulose dispersion. 1 kg of the pretreated microfibrillated cellulose dispersion was added to 0.5 kg of titanium dioxide suspension and placed into a high-pressure reactor. High-pressure carbon dioxide was injected into the reactor, and the mixture was stirred at 45℃, 25 MPa, and 1000 r / min for 90 min. The pressure was then released at 1 MPa / min, and the mixture was separated to obtain a nanocellulose composite material. The titanium dioxide suspension was prepared by mixing 2 kg of titanium dioxide, 3 kg of melamine, 10 kg of urea, and 100 kg of deionized water, and stirring to obtain a titanium dioxide suspension.

[0055] Step 2: Add the mixed wood pulp board and nanocellulose composite material to distilled water and soak at 28°C for 24 hours; the mixed wood pulp board is a blend of softwood pulp board and hardwood pulp board; the content of hardwood pulp board in the mixed wood pulp board is 60wt%; the amount of mixed wood pulp board added is 10wt% of distilled water, and the amount of nanocellulose composite material added is 20wt% of the mixed wood pulp board;

[0056] Step 3: The material soaked in Step 2 is subjected to free pulping using a dewatering machine and a pulping machine in series, and pulped to 40°SR to obtain a mixed pulp.

[0057] Step 4: Add dodecyl dihydroxyethyl methyl ammonium chloride and polyamide epichlorohydrin to the mixed pulp, mix evenly, form into paper, press, and dry to obtain decorative base paper; the amount of dodecyl dihydroxyethyl methyl ammonium chloride added is 1 wt% of the mixed wood pulp board, and the amount of polyamide epichlorohydrin added is 1.5 wt% of the mixed wood pulp board.

[0058] Example 6:

[0059] A method for preparing an environmentally friendly decorative base paper includes the following steps:

[0060] Step 1: Take 1 kg of microfibrillated cellulose, 30 kg of deionized water, 15 kg of polyaspartic acid, and 0.5 kg of glutaraldehyde and add them to a microwave-ultrasound integrated reactor. Simultaneously turn on the microwave and ultrasound, and carry out a synergistic treatment reaction at 70°C for 60 min. Dry at 80°C, pulverize, and obtain modified microfibrillated cellulose. The microwave power of the synergistic treatment reaction is 800 W, the ultrasound power is 800 W, and the ultrasound frequency is 35 kHz.

[0061] 1 kg of modified microfibrillated cellulose was added to 20 kg of water, followed by 0.01 kg of sodium dodecylbenzenesulfonate. The mixture was stirred at 500 r / min for 30 min to obtain a pretreated modified microfibrillated cellulose dispersion. 1 kg of the pretreated microfibrillated cellulose dispersion was added to 0.5 kg of titanium dioxide suspension and placed into a high-pressure reactor. High-pressure carbon dioxide was injected into the reactor, and the mixture was stirred at 45℃, 25 MPa, and 1000 r / min for 90 min. The pressure was then released at 1 MPa / min, and the mixture was separated to obtain a nanocellulose composite material. The titanium dioxide suspension was prepared by mixing 2 kg of titanium dioxide, 3 kg of melamine, 10 kg of urea, and 100 kg of deionized water, and stirring to obtain a titanium dioxide suspension.

[0062] Step 2: Add the mixed wood pulp board and nanocellulose composite material to distilled water and soak at 28°C for 24 hours; the mixed wood pulp board is a blend of softwood pulp board and hardwood pulp board; the content of hardwood pulp board in the mixed wood pulp board is 60wt%; the amount of mixed wood pulp board added is 10wt% of distilled water, and the amount of nanocellulose composite material added is 20wt% of the mixed wood pulp board;

[0063] Step 3: The material soaked in Step 2 is subjected to free pulping using a dewatering machine and a pulping machine in series, and pulped to 40°SR to obtain a mixed pulp.

[0064] Step 4: Add dodecyl dihydroxyethyl methyl ammonium chloride and polyamide epichlorohydrin to the mixed pulp, mix evenly, form into paper, press, and dry to obtain decorative base paper; the amount of dodecyl dihydroxyethyl methyl ammonium chloride added is 1 wt% of the mixed wood pulp board, and the amount of polyamide epichlorohydrin added is 1.5 wt% of the mixed wood pulp board.

[0065] The properties of the decorative base paper prepared in Examples 1-6 were tested: the paper weight of the decorative base paper was 70 g / m². 2 ;

[0066] Tightness was tested according to the method in GB / T451.3-2002; longitudinal tensile strength was measured according to GB / T12914-2008 "Determination of Tensile Strength of Paper and Paperboard"; tear strength was tested according to the method in GB / T455-2002; the results are shown in Table 1.

[0067] Table 1

[0068]

[0069] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details shown and described herein.

Claims

1. A method for preparing an environmentally friendly decorative base paper, characterized in that, Includes the following steps: Step 1: Add the modified microfibrillated cellulose to water, then add sodium dodecylbenzenesulfonate, stir, and obtain a pretreated modified microfibrillated cellulose dispersion; The pretreated modified microfibrillated cellulose dispersion was added to the titanium dioxide suspension, stirred, and separated to obtain the nanocellulose composite material. Step 2: Add the mixed wood pulp board and nanocellulose composite material to distilled water and soak. Step 3: The material soaked in Step 2 is subjected to free pulping using a dewatering machine and a pulping machine connected in series to obtain a mixed pulp; Step 4: Add dodecyl dihydroxyethyl methyl ammonium chloride and polyamide epichlorohydrin to the mixed pulp, mix evenly, form into paper, press, and dry to obtain decorative base paper; In step one, the treatment process of modified microfibrillated cellulose is as follows: Microfibrillated cellulose, deionized water, polyaspartic acid and glutaraldehyde were subjected to an ultrasonic reaction at high temperature, dried and pulverized to obtain modified microfibrillated cellulose. or, Microfibrillated cellulose, deionized water, polyaspartic acid, and glutaraldehyde were added to a microwave-ultrasonic integrated reactor. The microwave and ultrasonic waves were turned on simultaneously, and the reaction was carried out in a synergistic manner at a temperature of 65-80℃ for 45-60 minutes. The mixture was then dried and pulverized to obtain modified microfibrillated cellulose.

2. The method for preparing an environmentally friendly decorative base paper according to claim 1, characterized in that, In the process of obtaining modified microfibrillated cellulose, deionized water, polyaspartic acid, and glutaraldehyde, microfibrillated cellulose, deionized water, polyaspartic acid, and glutaraldehyde are subjected to ultrasonic reaction at high temperature, dried, and pulverized. The mass ratio of microfibrillated cellulose to deionized water is 1:30~45; the mass ratio of microfibrillated cellulose to polyaspartic acid is 1:15~25; the mass ratio of microfibrillated cellulose to glutaraldehyde is 1:0.1~1.5; the ultrasonic reaction is performed at a temperature of 65~80℃ for 1.5~2.5 hours; the ultrasonic power is 800~1000W; the ultrasonic frequency is 35~45KHz; and the drying temperature is 60~80℃.

3. The method for preparing an environmentally friendly decorative base paper according to claim 1, characterized in that, Microfibrillated cellulose, deionized water, polyaspartic acid, and glutaraldehyde were added to a microwave-ultrasound integrated reactor. Microwave and ultrasound were simultaneously activated, and a synergistic treatment reaction was carried out at 65-80℃ for 45-60 minutes. After drying and pulverization, modified microfibrillated cellulose was obtained. The mass ratio of microfibrillated cellulose to deionized water was 1:30-45; the mass ratio of microfibrillated cellulose to polyaspartic acid was 1:15-25; the mass ratio of microfibrillated cellulose to glutaraldehyde was 1:0.1-1.5; the microwave power for the synergistic treatment reaction was 500-800W, the ultrasound power was 800-1000W, and the ultrasound frequency was 35-45kHz; the drying temperature was 60-80℃.

4. The method for preparing an environmentally friendly decorative base paper according to claim 1, characterized in that, In step one, the mass ratio of modified microfibrillated cellulose to water is 1:20~30; the mass ratio of modified microfibrillated cellulose to sodium dodecylbenzenesulfonate is 100~300:1; the stirring time is 30~60 min, and the stirring speed is 500~1000 r / min.

5. The method for preparing an environmentally friendly decorative base paper according to claim 1, characterized in that, In step one, the mass ratio of the pretreated modified microfibrillated cellulose dispersion to the titanium dioxide suspension is 1:0.2~0.

6. The titanium dioxide suspension is prepared by mixing 1~5 parts by weight of titanium dioxide, 3~5 parts by weight of melamine, 10~15 parts by weight of urea and 80~100 parts by weight of deionized water, stirring to obtain the titanium dioxide suspension. The stirring speed is 500~1000 r / min.

6. The method for preparing an environmentally friendly decorative base paper according to claim 1, characterized in that, In step two, the mixed wood pulp board is obtained by blending softwood pulp board and hardwood pulp board; the content of hardwood pulp board in the mixed wood pulp board is 60~70wt%; the amount of mixed wood pulp board added is 10~15wt% of distilled water, and the amount of nanocellulose composite material added is 15~25wt% of the mixed wood pulp board; the soaking temperature is 25~30℃, and the time is 12~36 hours.

7. The method for preparing an environmentally friendly decorative base paper according to claim 1, characterized in that, In step three, the pulp is beaten to 35-45°SR; in step four, the amount of dodecyl dihydroxyethyl methyl ammonium chloride added is 0.8-1.5 wt% of the mixed wood pulp board, and the amount of polyamide epichlorohydrin mixed wood pulp board is 1-2 wt%.

8. An environmentally friendly decorative base paper prepared by the preparation method according to any one of claims 1 to 7.

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