阅读说明：本技术 一种环保包装盒及其制备工艺 (Environment-friendly packaging box and preparation process thereof ) 是由 程用志 操华 于 2020-11-27 设计创作，主要内容包括：本申请涉及包装容器领域,具体公开了一种环保包装盒,由包含以下重量份的原料制成：香樟树叶粉末、秸秆粉末、胶粘剂、L-天门冬氨酸与L-谷氨酸的共聚物、补强剂。一种环保包装盒的制备工艺,包括以下步骤：S1,纸浆的制备：按重量份称取原料,放入打浆机内进行研磨打浆,得到纸浆；S2,包装纸板的制备：将纸浆送入长网纸机中抄造成湿纸板,再用压力设备对湿纸板进行压制,得到半干纸板,经烘干得到包装纸板；S3,包装盒制作：将包装纸板进行加工处理,制得环保包装盒。本环保包装盒采用可再生能源秸秆、香樟树叶为原料,绿色环保,同时本环保包装盒具有较高的耐破强度与抗张强度。(The application relates to the field of packaging containers, and specifically discloses an environment-friendly packaging box which is prepared from the following raw materials in parts by weight: camphor tree leaf powder, straw powder, an adhesive, a copolymer of L-aspartic acid and L-glutamic acid, and a reinforcing agent. A preparation process of an environment-friendly packaging box comprises the following steps: s1, preparation of paper pulp: weighing the raw materials according to the parts by weight, and putting the raw materials into a pulping machine for grinding and pulping to obtain paper pulp; s2, preparation of packaging paperboard: feeding the paper pulp into a fourdrinier paper machine to make a wet paper board, pressing the wet paper board by using pressure equipment to obtain a semi-dry paper board, and drying to obtain a packaging paper board; s3, manufacturing the packaging box: and processing the packaging paperboard to obtain the environment-friendly packaging box. The environment-friendly packaging box adopts renewable energy straws and camphor tree leaves as raw materials, is green and environment-friendly, and has higher burst strength and tensile strength.)

1. The environment-friendly packaging box is characterized by being prepared from the following raw materials in parts by weight:

20-30 parts of camphor tree leaf powder;

70-80 parts of straw powder;

15-25 parts of an adhesive;

10-15 parts of a copolymer of L-aspartic acid and L-glutamic acid;

20-30 parts of reinforcing agent.

2. The environment-friendly packaging box according to claim 1, wherein: the relative molecular mass of the copolymer of L-aspartic acid and L-glutamic acid is 1.7x10⁴-1.8x10⁴。

3. The environment-friendly packaging box according to claim 2, wherein: the preparation method of the copolymer of L-aspartic acid and L-glutamic acid comprises the following steps:

mixing L-aspartic acid and L-glutamic acid uniformly, adding phosphoric acid, wherein the molar ratio of the L-aspartic acid to the L-glutamic acid to the phosphoric acid is (8-9): 1:5, the reaction temperature is 190-210 ℃, taking out the mixture after reaction for 3-5h, cooling the mixture, adding 200ml of deionized water and 250ml of the deionized water, performing suction filtration, washing the mixture to be neutral by using the deionized water, and drying the mixture to obtain the copolymer of the L-aspartic acid and the L-glutamic acid.

4. The environment-friendly packaging box and the preparation process thereof as claimed in claim 1, wherein the packaging box comprises: the reinforcing agent is nano ceramic powder.

5. The environment-friendly packaging box and the preparation process thereof as claimed in claim 1, wherein the packaging box comprises: also comprises 1-2 parts of potassium permanganate.

6. The manufacturing process of the environmentally friendly packing box according to any one of claims 1 to 5, comprising the steps of:

s1, preparation of paper pulp: weighing 20-30 parts of camphor tree leaf powder, 70-80 parts of straw powder, 15-25 parts of adhesive, 5-10 parts of copolymer of L-aspartic acid and L-glutamic acid, 20-30 parts of reinforcing agent and 300 parts of water 200-containing organic solvent according to parts by weight, and putting the mixture into a pulping machine for grinding and pulping to obtain paper pulp;

s2, preparation of packaging paperboard: papermaking paper pulp into a wet paperboard, profiling the wet paperboard by a pressure device to obtain a semi-dry paperboard, and drying to obtain a packaging paperboard;

s3, manufacturing the packaging box: and processing the packaging paperboard to obtain the environment-friendly packaging box.

7. The manufacturing process of the environment-friendly packing box according to claim 6, characterized in that: and S2, soaking the semi-dry paperboard in the latex mixed liquor, profiling the semi-dry paperboard by adopting pressure equipment after soaking to obtain the semi-dry paperboard after soaking, and drying to obtain the packaging paperboard.

8. The manufacturing process of the environment-friendly packing box according to claim 7, characterized in that: the latex mixed solution is prepared by mixing 5-6 parts of carboxylic styrene-butadiene latex and 1 part of nano zirconia in parts by weight.

Technical Field

The application relates to the technical field of packaging paperboard manufacturing, in particular to an environment-friendly packaging box and a preparation process thereof.

Background

The packaging box is a box for packaging products, and comprises a paper box, an iron box, a wood box, a leather box and the like according to different materials. The paper box is the most common packaging box at present, and has the advantages of cheapest raw materials, convenient production and processing and low cost.

Spectacles are articles which are worn in front of the eyes by combining lenses and frames and are used for improving eyesight, protecting the eyes or serving as decoration. The lenses of the glasses are generally made of a transparent material with one or more curved surfaces, which is made of optical materials such as glass or resin, and the pressure resistance of the lenses is poor. In the transportation of the glasses, the glasses are usually transported in a paper box, but the paper box is easily pressed and deformed, so that the glasses inside the paper box are damaged, and therefore, the physical strength of the paper box needs to be improved.

Disclosure of Invention

In order to improve the physical strength of the packaging box, the application provides an environment-friendly packaging box and a preparation process thereof.

First aspect, the application provides an environmental protection packing carton, adopts following technical scheme:

the environment-friendly packaging box is characterized by being prepared from the following raw materials in parts by weight:

20-30 parts of camphor tree leaf powder;

70-80 parts of straw powder;

15-25 parts of an adhesive;

10-15 parts of a copolymer of L-aspartic acid and L-glutamic acid;

20-30 parts of reinforcing agent.

By adopting the technical scheme, the yield of the straws is high every year in China, the environment is polluted by straw burning treatment, the straws can be effectively utilized as the raw materials of the packaging box, and the packaging box is green and environment-friendly.

The L-aspartic acid molecule has two carboxyl groups and amino groups, the L-glutamic acid molecule also has two carboxyl groups and amino groups, the polymerization degree of the copolymer of the L-aspartic acid and the L-glutamic acid is high, the molecular chain is longer, and meanwhile, hydrogen bonds can be formed among the molecules, so that the intermolecular association of the copolymer is tight. The copolymer of L-aspartic acid and L-glutamic acid is added into the paper pulp system, so that the binding force between paper pulp fibers is improved, the compactness of the produced packaging box is improved, and the physical strength of the packaging box is further improved.

The reinforcing agent is used for filling the paper pulp system, so that the physical strength of the packing box is improved. The camphor tree leaves contain higher content of camphor, dicyclic hydrocarbon, various esters, various phenols and various alcohols, the camphor tree is beneficial to corrosion prevention and insect prevention, the various phenols and the various alcohols can form hydrogen bonds with the copolymer of L-aspartic acid and L-glutamic acid, the binding capacity of the paper pulp fibers and the copolymer of L-aspartic acid and L-glutamic acid is improved, and therefore the strength of the packaging box is improved.

Optionally, the relative molecular mass of the copolymer of L-aspartic acid and L-glutamic acid is 1.7x10⁴-1.8x10⁴。

By adopting the technical scheme, the relative molecular mass of the copolymer of the L-aspartic acid and the L-glutamic acid is controlled to be 1.7x10⁴-1.8x10⁴So that the copolymer can keep better stability. The method for preparing the copolymer of L-aspartic acid and L-glutamic acid with larger relative molecules has lower yield and wastes raw materials, and the copolymer is easy to crack due to the increase of active groups on the copolymer due to the steric hindrance relationship; when the copolymer is relatively small, the internal relevance of the paper pulp is poor, so that the physical strength of the produced packing box is reduced.

Optionally, the preparation method of the copolymer of L-aspartic acid and L-glutamic acid is as follows:

mixing L-aspartic acid and L-glutamic acid uniformly, adding phosphoric acid, wherein the molar ratio of the L-aspartic acid to the L-glutamic acid to the phosphoric acid is (8-9): 1:5, the reaction temperature is 190-210 ℃, taking out the mixture after reaction for 3-5h, cooling the mixture, adding 200ml of deionized water and 250ml of the deionized water, performing suction filtration, washing the mixture to be neutral by using the deionized water, and drying the mixture to obtain the copolymer of the L-aspartic acid and the L-glutamic acid.

By adopting the technical scheme, when the molar ratio of the L-aspartic acid to the L-glutamic acid to the phosphoric acid is (8-9) to 1:5 and the reaction temperature is 190-210 ℃, the relative molecular mass is 1.7x10⁴-1.8x10⁴The copolymer of L-aspartic acid and L-glutamic acid. And the method adopts the melting reaction, so that the subsequent purification treatment operation is simple.

Optionally, the reinforcing agent is nano ceramic powder.

Through the technical scheme, the nano ceramic powder has extremely small particle size, larger specific surface area and high chemical performance, and is filled in a paper pulp system to densify and homogenize the structure of the packing box, so that the physical strength of the packing box is improved.

Optionally, the composition also comprises 1-2 parts of potassium permanganate.

Through the technical scheme, the carbonyl in the copolymer of the L-aspartic acid and the L-glutamic acid is easy to form excited carbonyl after being irradiated by ultraviolet light, but the carbonyl in the excited state can exchange energy with adjacent carbonyl along a main chain, so that the copolymer of the L-aspartic acid and the L-glutamic acid is broken, and the strength of the packaging box is reduced. Oxygen is generated after potassium permanganate is decomposed, so that the paper pulp contains higher oxygen, and the excited carbonyl can transfer the excitation energy to O through energy transfer₂So that oxygen is converted into a singlet state, thereby reducing the degradation speed of the copolymer of the L-aspartic acid and the L-glutamic acid and keeping better physical strength of the paperboard.

In a second aspect, the application provides a preparation process of an environment-friendly packaging box, which adopts the following technical scheme:

a preparation process of an environment-friendly packaging box comprises the following steps:

s1, preparation of paper pulp: weighing 20-30 parts of camphor tree leaf powder, 70-80 parts of straw powder, 15-25 parts of adhesive, 5-10 parts of copolymer of L-aspartic acid and L-glutamic acid, 20-30 parts of reinforcing agent and 300 parts of water 200-containing organic solvent according to parts by weight, and putting the mixture into a pulping machine for grinding and pulping to obtain paper pulp;

s2, preparation of packaging paperboard: papermaking paper pulp into a wet paperboard, profiling the wet paperboard by a pressure device to obtain a semi-dry paperboard, and drying to obtain a packaging paperboard;

s3, manufacturing the packaging box: and processing the packaging paperboard to obtain the environment-friendly packaging box.

By adopting the technical scheme, the environment-friendly packaging box with better physical strength is obtained.

Optionally, the semi-dry paperboard obtained in the step S2 is soaked in the latex mixed solution, and after soaking, the semi-dry paperboard is pressed by a pressing device to obtain a semi-dry paperboard after being soaked with the latex, and then the semi-dry paperboard is dried to obtain a packaging paperboard.

By adopting the technical scheme, the latex mixed liquid soaks the semi-dry paperboard, so that the semi-dry paperboard absorbs the mixed latex, the sizing of the paperboard is facilitated, and the physical strength of the paperboard is improved.

Optionally, the latex mixed solution is prepared by mixing 5-6 parts by weight of carboxylic styrene-butadiene latex and 1 part by weight of nano zirconia.

Through the technical scheme, the carboxylic styrene-butadiene latex is a copolymer generated by polymerizing butadiene, styrene, a small amount of carboxylic acid and other auxiliary agents, and the polarity is improved by introducing carboxyl, so that the carboxylic styrene-butadiene latex has higher bonding capacity. The nano zirconia is filled in the carboxylic styrene-butadiene latex, so that a glue film formed on the surface layer of the packaging paperboard after the latex mixed solution is dried has stronger wear resistance.

In summary, the present application has the following beneficial effects:

1. the packaging box has stronger strength by adding the copolymer of the L-aspartic acid and the L-glutamic acid.

2. By adding potassium permanganate, the copolymer of the L-aspartic acid and the L-glutamic acid is not easy to photolyze.

3. The semi-dry paperboard is soaked in the latex mixed liquor and then is pressed, so that the physical strength and the wear-resisting strength of the packaging paperboard are improved.

Detailed Description

The following examples further illustrate the present application in detail.

Preparing materials:

l-aspartic acid is sold by Wuhan Fuxin Yuanzhi Co., Ltd; the L-glutamic acid is sold by Jiahui food additive company Limited in Zhongshan; the nano ceramic powder is far infrared ceramic powder 201 sold by Hebei Jinghang mineral products Limited company; the carboxylic styrene-butadiene latex is sold by Shoshijing environmental protection science and technology limited in Foshan City, and the model is Basff SD 516.

Preparation example 1:

preparing an adhesive:

mixing 10 parts of corn flour and 50 parts of water in parts by weight, stirring and heating the mixture at 100 ℃, heating the mixture for 10min, cooling the mixture to 50 ℃, adding 0.05 part of calcium sulfate and 2 parts of 30wt% hydrochloric acid solution, reacting the mixture for 0.5h, cooling the mixture to 40 ℃, adding 2 parts of 30wt% sodium hydroxide, and reacting the mixture for 0.5h to obtain the adhesive.

Preparation example 2:

preparing camphor tree leaf powder and straw powder:

collecting camphor tree leaves and straws, and respectively drying, cutting and grinding the camphor tree leaves and the straws to obtain camphor tree leaf powder and straw powder.

Example 1:

an environment-friendly packaging box is prepared from the following raw materials in parts by weight:

20 parts of camphor tree leaf powder;

70 parts of straw powder;

15 parts of an adhesive;

10 parts of copolymer of L-aspartic acid and L-glutamic acid;

20 parts of nano calcium carbonate.

The preparation method of the copolymer of L-aspartic acid and L-glutamic acid comprises the following steps:

mixing L-aspartic acid and L-glutamic acid uniformly, adding a catalyst phosphoric acid, putting into an electric heating constant temperature blast drying oven, reacting at 190 ℃ for 3h, taking out, cooling, adding 200ml of deionized water, performing suction filtration, washing with deionized water to be neutral, and drying to obtain the copolymer of L-aspartic acid and L-glutamic acid.

A preparation process of an environment-friendly packaging box comprises the following steps:

s1, preparation of paper pulp: weighing 20 parts of camphor tree leaf powder, 70 parts of straw powder, 15 parts of adhesive, 10 parts of copolymer of L-aspartic acid and L-glutamic acid, 20 parts of reinforcing agent and 200 parts of water according to parts by weight, and putting the mixture into a pulping machine for grinding and pulping to obtain paper pulp;

s2, preparation of packaging paperboard: feeding the paper pulp into a fourdrinier paper machine to make a wet paper board, pressing and molding the wet paper board by using a pressing device under the pressure of 1MPa to obtain a semi-dry paper board, and drying at the temperature of 100 ℃ to obtain the paper board with the thickness of 2mm and the quantitative weight of 1600g/m²The packaging board of (1);

s3, manufacturing the packaging box: and processing the packaging paperboard to obtain the environment-friendly packaging box.

Example 2:

an environment-friendly packaging box is prepared from the following raw materials in parts by weight:

30 parts of camphor tree leaf powder;

80 parts of straw powder;

25 parts of an adhesive;

15 parts of copolymer of L-aspartic acid and L-glutamic acid;

30 parts of nano calcium carbonate.

The preparation method of the copolymer of L-aspartic acid and L-glutamic acid comprises the following steps:

uniformly mixing L-aspartic acid and L-glutamic acid, adding a catalyst phosphoric acid, putting the mixture into an electric heating constant-temperature air-blast drying oven, reacting at 210 ℃ for 3-5h, taking out, cooling, adding 250ml of deionized water, performing suction filtration, washing with deionized water to be neutral, and drying to obtain the copolymer of L-aspartic acid and L-glutamic acid.

A preparation process of an environment-friendly packaging box comprises the following steps:

s1, preparation of paper pulp: weighing 30 parts of camphor tree leaf powder, 80 parts of straw powder, 25 parts of adhesive, 15 parts of copolymer of L-aspartic acid and L-glutamic acid, 30 parts of reinforcing agent and 300 parts of water according to parts by weight, and putting the mixture into a pulping machine for grinding and pulping to obtain paper pulp;

s2, preparation of packaging paperboard: feeding the paper pulp into a fourdrinier paper machine to make a wet paper board, pressing and molding the wet paper board by using a pressing device under the pressure of 1MPa to obtain a semi-dry paper board, and drying at the temperature of 100 ℃ to obtain the paper board with the thickness of 2mm and the quantitative weight of 1600g/m²The packaging board of (1);

s3, manufacturing the packaging box: and processing the packaging paperboard to obtain the environment-friendly packaging box.

Example 3:

an environment-friendly packaging box is prepared from the following raw materials in parts by weight:

25 parts of camphor tree leaf powder;

75 parts of straw powder;

20 parts of an adhesive;

13 parts of copolymer of L-aspartic acid and L-glutamic acid;

25 parts of nano calcium carbonate.

The preparation method of the copolymer of L-aspartic acid and L-glutamic acid comprises the following steps:

uniformly mixing L-aspartic acid and L-glutamic acid, adding a catalyst phosphoric acid, putting into a vacuum drying oven and an electric heating constant-temperature air blast drying oven, wherein the molar ratio of the L-aspartic acid to the L-glutamic acid to the phosphoric acid is 8:1:5, the reaction temperature is 200 ℃, taking out after 4 hours of reaction, cooling, adding 250ml of deionized water, carrying out suction filtration, washing with deionized water to be neutral, and drying to obtain the copolymer of the L-aspartic acid and the L-glutamic acid.

A preparation process of an environment-friendly packaging box comprises the following steps:

s1, preparation of paper pulp: weighing 25 parts of camphor tree leaf powder, 75 parts of straw powder, 20 parts of adhesive, 13 parts of copolymer of L-aspartic acid and L-glutamic acid, 25 parts of reinforcing agent and 250 parts of water according to parts by weight, and putting the mixture into a pulping machine for grinding and pulping to obtain paper pulp;

s2, preparation of packaging paperboard: feeding the paper pulp into a fourdrinier paper machine to make a wet paper board, pressing and molding the wet paper board by using a pressing device under the pressure of 1MPa to obtain a semi-dry paper board, and drying at the temperature of 100 ℃ to obtain the paper board with the thickness of 2mm and the quantitative weight of 1600g/m²The packaging board of (1);

s3, manufacturing the packaging box: and processing the packaging paperboard to obtain the environment-friendly packaging box.

Example 4:

the difference from example 3 is that: in the preparation of the copolymer of L-aspartic acid and L-glutamic acid, L-aspartic acid and L-The molar ratio of glutamic acid to phosphoric acid is 1:3:2, and the obtained product has a relative molecular mass of 0.5x10⁴Copolymers of L-aspartic acid with L-glutamic acid.

Example 5:

the difference from example 3 is that: the nano ceramic powder equivalently replaces the nano calcium carbonate.

Example 6:

the difference from example 3 is that: 1 part of potassium permanganate is added.

Example 7:

the difference from example 3 is that: 2 parts of potassium permanganate are added.

Example 8:

the difference from example 3 is that: 1.5 parts of potassium permanganate are added.

Example 9:

the difference from example 3 is that: s2, soaking the semi-dry paperboard in the latex mixed liquor, pressing and molding the wet paperboard by adopting a pressing device after soaking, wherein the pressure is 1MPa, obtaining the semi-dry paperboard after soaking, and drying at the temperature of 100 ℃ to obtain the semi-dry paperboard with the thickness of 2.2mm and the quantitative of 1800g/m²The packaging paperboard of (1).

The preparation method of the latex mixed solution comprises the following steps:

weighing 5 parts of carboxylic styrene-butadiene latex and 1 part of nano zirconia, and mixing to obtain a latex mixed solution.

Example 10:

the difference from example 3 is that: s2, soaking the semi-dry paperboard in the latex mixed liquor, pressing and molding the wet paperboard by adopting a pressing device after soaking, wherein the pressure is 1MPa, obtaining the semi-dry paperboard after soaking, and drying at the temperature of 100 ℃ to obtain the semi-dry paperboard with the thickness of 2.2mm and the quantitative of 1800g/m²The packaging paperboard of (1).

The preparation method of the latex mixed solution comprises the following steps:

weighing 6 parts of carboxylic styrene-butadiene latex and 1 part of nano zirconia, and mixing to obtain a latex mixed solution.

Example 11:

the difference from example 3 is that: and S2, soaking the semi-dry paperboard in the latex mixed liquor, pressing and molding the wet paperboard by adopting a pressing device after soaking, wherein the pressure is 1MPa, so as to obtain the semi-dry paperboard after soaking, and drying at the temperature of 100 ℃ to obtain the packaging paperboard with the thickness of 2.2mm and the quantitative of 1800g/m 2.

The preparation method of the latex mixed solution comprises the following steps:

5.5 parts of carboxylic styrene-butadiene latex and 1 part of nano zirconia are weighed and mixed according to the parts by weight to prepare latex mixed liquor.

Comparative example 1:

the difference from example 3 is that a copolymer of L-aspartic acid and L-glutamic acid was not added.

Comparative example 2:

the difference from the embodiment 3 is that the straw powder is used for replacing camphor tree leaf powder in equal amount.

Performance test

The tensile strength and bursting strength of the packaging paperboard in the examples and the comparative examples were measured with reference to GB/T12914-2008 "determination of tensile strength of paper and paperboard" and GB/T454-2002 "determination of bursting Strength of paper". The test results are detailed in table 1.

The tensile strength and bursting strength of the packaging paperboard after illumination in example 3 and examples 6 to 8 were measured by UV irradiation for 72h at an illumination intensity of 500Lux in reference to GB/T12914-2008 "determination of tensile strength of paper and paperboard" and GB/T454-2002 "determination of bursting strength of paper". The test results are detailed in table 2.

TABLE 1

	Tensile index (N m/g)	Burst index (KPa m 2/g)
			Practice ofExample 1	25.6	2.24
Example 2	26.6	2.28
			Example 3	26.6	2.31
Example 4	21.4	1.83
			Example 5	27.7	2.46
Example 6	26.7	2.33
			Example 7	26.7	2.32
Example 8	26.8	2.33
			Example 9	32.5	2.9
Example 10	32.7	2.92
			Example 11	32.8	2.94
Comparative example 1	12.6	1.35
			Comparative example 2	16.9	1.54

TABLE 2

	Tensile index (N m/g)	Burst index (KPa m 2/g)
			Example 3	21.4	2.08
Example 6	24.5	22.3
			Example 7	25.2	22.7
Example 8	24.8	22.5

As can be seen by combining examples 3 and 4 with Table 1, the relative molecular mass of the copolymer of L-aspartic acid and L-glutamic acid was 1.7X10⁴-1.8x10⁴In the process, the copolymer has better stability, and the overall relevance of a paper pulp system is improved, so that the tensile strength and the burst strength of the packaging paperboard are improved. When the copolymer is relatively small, the internal relevance of the paper pulp is poor, and the physical strength of the packaging paper board is reduced.

It can be seen from the combination of examples 3 and 5 and table 1 that the nano ceramic powder filled in the pulp system densifies and homogenizes the structure of the packing box, thereby improving the physical strength of the packing box

Combining example 3 and examples 6-8 with tables 1 and 2, it can be seen that the addition of potassium permanganate has little effect on the strength of the board. But potassium permanganate is added to inhibit the photolysis of the copolymer of the L-aspartic acid and the L-glutamic acid, so that the paperboard can still keep better physical strength after being irradiated by ultraviolet light.

Combining example 3 and examples 9-11 with table 1, it can be seen that the semi-dry paperboard is soaked in the latex mixture prepared by mixing nano zirconia and carboxylic acid styrene-butadiene latex, and a latex mixture film is formed on the surface of the packaging paperboard, which significantly improves the tensile strength and burst strength of the packaging paperboard.

It can be seen from the combination of example 3 and comparative example 1 and Table 1 that the tensile strength and burst strength of the packaging board are improved by increasing the binding force between pulp fibers by adding the copolymer of L-aspartic acid and L-glutamic acid.

Combining example 3 and comparative example 2 with table 1, it can be seen that the various phenols and various alcohols in the camphor tree leaves can form hydrogen bonds with the copolymer of L-aspartic acid and L-glutamic acid, so as to improve the binding capacity of the pulp fibers with the copolymer of L-aspartic acid and L-glutamic acid, and the copolymer of L-aspartic acid and L-glutamic acid has intermolecular hydrogen bonds, so that the overall association of the paper board is improved, and the physical properties of the packaging paper board are enhanced.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.