阅读说明：本技术 一种绿色环保瓦楞纸制备方法 (Preparation method of green environment-friendly corrugated paper ) 是由 李昌斌 于 2020-05-29 设计创作，主要内容包括：本发明公开了一种绿色环保瓦楞纸制备方法；涉及瓦楞纸技术领域,包括以下步骤：(1)酶处理木浆；(2)超声波处理；(3)打浆；本发明方法制备的瓦楞纸具有良好的力学性能,本发明通过采用木聚糖酶对木浆进行酶处理,能够对纤维表面进行酶解修饰,不仅能够提高纤维的性能,同时,能够有效的便于后续生成的BiOBr与纤维进行结合,使得BiOBr能够较为均匀的分散结合到纤维表面,通过氢氧化钠复合水溶液,首先,能够提高木浆纤维的韧性,促进提高瓦楞纸的力学性能。(The invention discloses a preparation method of green environment-friendly corrugated paper; relates to the technical field of corrugated paper, comprising the following steps: (1) treating wood pulp with enzyme; (2) ultrasonic treatment; (3) pulping; the corrugated paper prepared by the method has good mechanical properties, the surface of the fiber can be subjected to enzymolysis modification by adopting xylanase to carry out enzyme treatment on wood pulp, the performance of the fiber can be improved, simultaneously, the subsequent generated BiOBr can be effectively and conveniently combined with the fiber, the BiOBr can be uniformly dispersed and combined on the surface of the fiber, and through the sodium hydroxide composite aqueous solution, firstly, the toughness of the wood pulp fiber can be improved, and the improvement of the mechanical properties of the corrugated paper is promoted.)

1. The preparation method of the green environment-friendly corrugated paper is characterized by comprising the following steps:

(1) enzyme treatment of wood pulp:

adding xylanase into wood pulp, heating to 36-40 deg.C, maintaining temperature in water bath, treating for 7-10 hr, heating to boil for 1-2min, and naturally cooling to room temperature to obtain enzyme-treated wood pulp;

(2) ultrasonic treatment:

sequentially adding urea and thiourea into a sodium hydroxide solution to obtain a sodium hydroxide composite aqueous solution;

adding a sodium hydroxide composite aqueous solution and bismuth nitrate into the obtained enzyme-treated wood pulp, stirring at the rotating speed of 500r/min for 30-40min, adjusting the temperature to 55-65 ℃, preserving the temperature for 20min, performing first treatment by ultrasonic waves, adding potassium bromide, continuously stirring for 35-40min, and performing second treatment by ultrasonic waves to obtain ultrasonic-treated wood pulp;

(3) pulping:

and pulping the obtained ultrasonic-treated wood pulp, and then carrying out papermaking drying, sizing, drying and forming to obtain the finished corrugated paper.

2. The preparation method of the green environment-friendly corrugated paper as claimed in claim 1, wherein the method comprises the following steps: the wood pulp is sulfate softwood pulp;

the kappa number of the sulfate softwood pulp is 13.51, the viscosity is 862 mL/g, and the whiteness is 45.13% ISO.

3. The preparation method of the green environment-friendly corrugated paper as claimed in claim 2, wherein the method comprises the following steps: the xylanase is beta-1, 4-D-exoxylosidase;

the mixing mass ratio of the beta-1, 4-D-exoxylosidase to the sulfate softwood pulp is 2-3: 90-95.

4. The preparation method of the green environment-friendly corrugated paper as claimed in claim 1, wherein the method comprises the following steps: in the sodium hydroxide composite aqueous solution, the mass fraction of sodium hydroxide is 7-8%;

the mass fraction of urea is 1.2-1.5%;

the mass fraction of thiourea is 0.7-1%.

5. The preparation method of the green environment-friendly corrugated paper as claimed in claim 4, wherein the method comprises the following steps: the preparation method of the sodium hydroxide composite aqueous solution comprises the steps of dissolving sodium hydroxide in warm water at the temperature of 40-45 ℃, preserving heat for 10min, adding thiourea, stirring at the rotating speed of 500r/min for 15min, standing for 10min, adding urea, continuously stirring for 40min, and standing for 2 hours.

6. The preparation method of the green environment-friendly corrugated paper as claimed in claim 1, wherein the method comprises the following steps: the enzyme-treated wood pulp, the sodium hydroxide composite aqueous solution and the bismuth nitrate are prepared from the following raw materials in parts by weight: 90-100:6-8:0.5-0.9.

7. The preparation method of the green environment-friendly corrugated paper as claimed in claim 6, wherein the method comprises the following steps: the molar ratio of the potassium bromide to the bismuth nitrate is 1: 1.

8. The preparation method of the green environment-friendly corrugated paper as claimed in claim 1, wherein the method comprises the following steps: the power of the first ultrasonic treatment is 550-600W, the frequency is 40kHz, and the treatment time is 3-5 min.

9. The method for preparing green environment-friendly corrugated paper as claimed in claim 1, wherein the power of the second ultrasonic treatment is 850- & 900W, the frequency is 50kHz, and the treatment time is 6-8 min.

Technical Field

The invention belongs to the technical field of corrugated paper, and particularly relates to a preparation method of green environment-friendly corrugated paper.

Background

The corrugated board is light in weight, cheap in price, wide in application, simple in manufacture, and capable of being recycled and even reused at the beginning of 18 th century and 19 th century, so that the application of the corrugated board is remarkably increased. By the beginning of the 20 th century, the packaging has been widely popularized, popularized and applied for various commodities. Packaging containers made using corrugated paperboard have enjoyed great success in competing with a variety of packaging materials, due to their unique properties and advantages for the beautification and protection of the contents. Becoming one of the main materials for manufacturing packaging containers which have not been used for a long time and have been developed rapidly so far.

Disclosure of Invention

The invention aims to provide a preparation method of green environment-friendly corrugated paper, which aims to overcome the defects in the prior art.

The technical scheme adopted by the invention is as follows:

a preparation method of green environment-friendly corrugated paper comprises the following steps:

(1) enzyme treatment of wood pulp:

adding xylanase into wood pulp, heating to 36-40 deg.C, maintaining temperature in water bath, treating for 7-10 hr, heating to boil for 1-2min, and naturally cooling to room temperature to obtain enzyme-treated wood pulp;

(2) ultrasonic treatment:

sequentially adding urea and thiourea into a sodium hydroxide solution to obtain a sodium hydroxide composite aqueous solution;

adding a sodium hydroxide composite aqueous solution and bismuth nitrate into the obtained enzyme-treated wood pulp, stirring at the rotating speed of 500r/min for 30-40min, adjusting the temperature to 55-65 ℃, preserving the temperature for 20min, performing first treatment by ultrasonic waves, adding potassium bromide, continuously stirring for 35-40min, and performing second treatment by ultrasonic waves to obtain ultrasonic-treated wood pulp;

(3) pulping:

and pulping the obtained ultrasonic-treated wood pulp, and then carrying out papermaking drying, sizing, drying and forming to obtain the finished corrugated paper.

The wood pulp is sulfate softwood pulp;

the kappa number of the sulfate softwood pulp is 13.51, the viscosity is 862 mL/g, and the whiteness is 45.13% ISO.

The xylanase is beta-1, 4-D-exoxylosidase;

the mixing mass ratio of the beta-1, 4-D-exoxylosidase to the sulfate softwood pulp is 2-3: 90-95.

In the sodium hydroxide composite aqueous solution, the mass fraction of sodium hydroxide is 7-8%;

the mass fraction of urea is 1.2-1.5%;

the mass fraction of thiourea is 0.7-1%.

The preparation method of the sodium hydroxide composite aqueous solution comprises the steps of dissolving sodium hydroxide in warm water at the temperature of 40-45 ℃, preserving heat for 10min, adding thiourea, stirring at the rotating speed of 500r/min for 15min, standing for 10min, adding urea, continuously stirring for 40min, and standing for 2 hours.

The enzyme-treated wood pulp, the sodium hydroxide composite aqueous solution and the bismuth nitrate are prepared from the following raw materials in parts by weight: 90-100:6-8:0.5-0.9.

The molar ratio of the potassium bromide to the bismuth nitrate is 1: 1.

The power of the first ultrasonic treatment is 550-600W, the frequency is 40kHz, and the treatment time is 3-5 min.

The power of the ultrasonic secondary treatment is 850-900W, the frequency is 50kHz, and the treatment time is 6-8 min.

After the green environment-friendly corrugated paper is prepared, the green environment-friendly corrugated paper needs to be illuminated for more than 3 hours by a 200W self-ballasted high-pressure mercury lamp and then is processed into a corrugated carton.

The invention adopts xylanase to carry out enzyme treatment on wood pulp, can carry out enzymolysis modification on the surface of the fiber, not only can improve the performance of the fiber, but also can effectively facilitate the combination of the subsequently generated BiOBr and the fiber, so that the BiOBr can be uniformly dispersed and combined on the surface of the fiber, and through the sodium hydroxide composite aqueous solution, firstly, the toughness of the wood pulp fiber can be improved, the mechanical property of corrugated paper is promoted to be improved, meanwhile, the surface group of the wood pulp fiber can be further modified in the sodium hydroxide composite aqueous solution, the treated wood Pulp Fiber (PFs) has the advantages of large specific surface area, strong adsorption capacity and the like, can be used as an excellent carrier for attaching photocatalytic nano particles, can increase the contact area of photocatalytic reaction, promote the BiOBr to be deposited on the surface of the wood pulp fiber, and improve the deposition rate of the BiOBr on the surface of the wood pulp fiber, the method has the advantages that the deposition rate of the BiOBr on the surface of the wood pulp fiber is improved, the photocatalytic effect of the BiOBr is improved, the efficiency of removing formaldehyde by photocatalysis can be further improved, the formaldehyde emitted from an adhesive in the prepared corrugated paper can be removed more quickly, the formaldehyde is prevented from being gathered, a large number of particles with BiOBr nano structures are attached to the surface of the wood pulp prepared by the method, the particle size is uniform, the particles are uniformly dispersed, the specific surface area of the fiber is increased, and the method is favorable for adsorbing and degrading formaldehyde gas by the composite photocatalytic paper. The surface of the wood pulp fiber is completely covered by the BiOBr nano-particles, and the fiber morphology is not destroyed. The forbidden band widths of BiOBr are respectively 1.84eV, the recombination of photo-generated electron-hole pairs can be reduced through the lower forbidden band width, and the improvement of the photocatalytic activity is facilitated. BiOBr has a layered structure consisting of [ Bi ]₂O₂]²⁺The alternating arrangement of layers and I-layers, covalent bonds within the layers and van der Waals forces between the layers results in BiOBr having a high degree of anisotropy andunique optical and electrical advantages, and good photocatalytic activity under the irradiation of ultraviolet light and visible light.

Has the advantages that:

the corrugated paper prepared by the method has good mechanical properties, the surface of the fiber can be subjected to enzymolysis modification by adopting xylanase to carry out enzyme treatment on wood pulp, the performance of the fiber can be improved, simultaneously, the subsequent generated BiOBr can be effectively and conveniently combined with the fiber, the BiOBr can be uniformly dispersed and combined on the surface of the fiber, and through the sodium hydroxide composite aqueous solution, firstly, the toughness of the wood pulp fiber can be improved, and the improvement of the mechanical properties of the corrugated paper is promoted.

Drawings

Fig. 1 is a force-deflection curve of corrugated cardboard with a relative humidity of 90%.

Detailed Description

A preparation method of green environment-friendly corrugated paper comprises the following steps:

(1) enzyme treatment of wood pulp:

adding xylanase into wood pulp, heating to 36-40 deg.C, maintaining temperature in water bath, treating for 7-10 hr, heating to boil for 1-2min, and naturally cooling to room temperature to obtain enzyme-treated wood pulp;

(2) ultrasonic treatment:

sequentially adding urea and thiourea into a sodium hydroxide solution to obtain a sodium hydroxide composite aqueous solution;

adding a sodium hydroxide composite aqueous solution and bismuth nitrate into the obtained enzyme-treated wood pulp, stirring at the rotating speed of 500r/min for 30-40min, adjusting the temperature to 55-65 ℃, preserving the temperature for 20min, performing first treatment by ultrasonic waves, adding potassium bromide, continuously stirring for 35-40min, and performing second treatment by ultrasonic waves to obtain ultrasonic-treated wood pulp; the invention adopts xylanase to carry out enzyme treatment on wood pulp, can carry out enzymolysis modification on the surface of the fiber, not only can improve the performance of the fiber, but also can effectively facilitate the combination of the subsequently generated BiOBr and the fiber, so that the BiOBr can be uniformly dispersed and combined on the surface of the fiber,through the sodium hydroxide composite aqueous solution, firstly, the toughness of the wood pulp fiber can be improved, the improvement of the mechanical property of the corrugated paper is promoted, meanwhile, the surface group of the wood pulp fiber can be further modified in the sodium hydroxide composite aqueous solution, the treated wood Pulp Fiber (PFs) has the advantages of large specific surface area, strong adsorption capacity and the like, can be used as an excellent carrier for attaching photocatalytic nano particles, can increase the contact area of photocatalytic reaction, promote BiOBr to be deposited on the surface of the wood pulp fiber, improve the deposition rate of BiOBr on the surface of the wood pulp fiber, improve the photocatalytic effect of the BiOBr by improving the deposition rate of the BiOBr on the surface of the wood pulp fiber, further improve the efficiency of removing formaldehyde in photocatalysis, enable formaldehyde emitted from an adhesive in the prepared corrugated paper to be removed more rapidly, avoid the aggregation of formaldehyde, and attach a large amount of particles with the BiOBr nano structure on the surface of the wood pulp prepared by the method, the particle size is uniform, and the dispersion is uniform, so that the specific surface area of the fiber is increased, and the composite photocatalytic paper is favorable for adsorbing and degrading formaldehyde gas. The surface of the wood pulp fiber is completely covered by the BiOBr nano-particles, and the fiber morphology is not destroyed. The forbidden band widths of BiOBr are respectively 1.84eV, the recombination of photo-generated electron-hole pairs can be reduced through the lower forbidden band width, and the improvement of the photocatalytic activity is facilitated. BiOBr has a layered structure consisting of [ Bi ]₂O₂]²⁺The layers and the I-layers are arranged alternately, and BiOBr has the advantages of high anisotropy, unique optics, electricity and the like due to covalent bonds in the layers and Van der Waals force between the layers, and has good photocatalytic activity under the irradiation of ultraviolet light and visible light;

thiourea: white and lustrous crystals. Is bitter in taste.

Melting Point (. degree. C.): 176 to 178;

relative density (water = 1): 1.41;

boiling point (. degree. C.): decomposing;

the molecular formula is as follows: CH (CH)₄N₂S；

Molecular weight: 76.12;

logarithmic value of octanol/water partition coefficient: 2.5;

urea

The characteristics are as follows: colorless or white needle-shaped or rod-shaped crystals, and industrial or agricultural products are white slightly reddish solid particles, and are odorless and tasteless. The nitrogen content is about 46.67%.

Boiling point: 196.6 ° Cat760 mmHg;

refractive index: n 20/D1.40;

flash point: 72.7 ℃;

density: 1.335;

melting point: 132.7 ℃;

water solubility: 1080 g/L (20 ℃);

solubility: dissolving in water, methanol, formaldehyde, ethanol, liquid ammonia and alcohol, and slightly dissolving in diethyl ether, chloroform and benzene; alkalescence;

(3) pulping:

and pulping the obtained ultrasonic-treated wood pulp, and then carrying out papermaking drying, sizing, drying and forming to obtain the finished corrugated paper.

The wood pulp is sulfate softwood pulp;

the kappa number of the sulfate softwood pulp is 13.51, the viscosity is 862 mL/g, and the whiteness is 45.13% ISO.

The xylanase is beta-1, 4-D-exoxylosidase;

the mixing mass ratio of the beta-1, 4-D-exoxylosidase to the sulfate softwood pulp is 2-3: 90-95.

In the sodium hydroxide composite aqueous solution, the mass fraction of sodium hydroxide is 7-8%;

the mass fraction of urea is 1.2-1.5%;

the mass fraction of thiourea is 0.7-1%.

The preparation method of the sodium hydroxide composite aqueous solution comprises the steps of dissolving sodium hydroxide in warm water at the temperature of 40-45 ℃, preserving heat for 10min, adding thiourea, stirring at the rotating speed of 500r/min for 15min, standing for 10min, adding urea, continuously stirring for 40min, and standing for 2 hours.

The enzyme-treated wood pulp, the sodium hydroxide composite aqueous solution and the bismuth nitrate are prepared from the following raw materials in parts by weight: 90-100:6-8:0.5-0.9.

The molar ratio of the potassium bromide to the bismuth nitrate is 1: 1.

The power of the first ultrasonic treatment is 550-600W, the frequency is 40kHz, and the treatment time is 3-5 min.

The power of the ultrasonic secondary treatment is 850-900W, the frequency is 50kHz, and the treatment time is 6-8 min.

After the green environment-friendly corrugated paper is prepared, the green environment-friendly corrugated paper needs to be illuminated for more than 3 hours by a 200W self-ballasted high-pressure mercury lamp and then is processed into a corrugated carton.

The following will clearly and completely describe the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.