CN111391415A - A kind of waterproof corrugated board and preparation method thereof - Google Patents

Abstract

The invention relates to the technical field of corrugated board preparation, in particular to a preparation method of a waterproof corrugated board, wherein the waterproof corrugated board comprises a corrugated paper core, and surface paper and lining paper which are adhered and fixed on the upper surface and the lower surface of the corrugated paper core, and the preparation method of the corrugated board comprises the following steps: s1, preparing a waterproof coating; s2, preparing a corrugated paper core; s3, treating surface paper and lining paper; s4, gluing and compounding; s5, preparing a semi-finished waterproof corrugated board; s6, laterally coating waterproof paint: coating waterproof paint on the side edge of the semi-finished waterproof corrugated board by using a vertically arranged paint roller, wherein the coating amount of the waterproof paint on the side edge is (1.3-1.5) g/m²And then drying to obtain the waterproof corrugated board. The corrugated board prepared by the invention has good waterproof performance.

Description

A kind of waterproof corrugated board and preparation method thereof

technical field

The invention relates to the technical field of corrugated cardboard preparation, and more particularly, to a waterproof corrugated cardboard and a preparation method thereof.

Background technique

As the most important packaging material, corrugated cardboard has the advantages of light weight and low cost compared with other packaging materials (such as wood, cardboard, etc. ⁾ The weight is about 2000g/m ² , which is more than 3 times that of corrugated cardboard.

The current corrugated cardboard, such as a three-layer composite waterproof corrugated cardboard and its preparation process disclosed in Chinese Patent Publication No. CN110154488A, the preparation process of the three-layer composite waterproof corrugated cardboard includes the following steps: preparation of corrugated paper layers; Treatment with inner paper: soak the surface paper and inner paper in the strengthening solution, take out the surface paper and inner paper after they are completely soaked, and place them in the environment of 45-55℃ to dry; The paper and the inner paper are evenly coated with a layer of waterproof coating on the side away from the corrugated cardboard layer, and dried at 50-60 ° C for 10-15 minutes to obtain a three-layer composite waterproof corrugated board. The coating amount of the waterproof coating is (1.2 -1.5) g/m ² .

In the above technology, only the surface paper and the inner paper are coated with waterproof coating. However, when water penetrates from the gap between the surface paper, the corrugated paper layer and the inner paper, the corrugated paper layer is prone to water seepage, which easily leads to The strength of corrugated paper is reduced. When the product stacks are heavy, it is difficult to bear its weight, and it is easy to deform or cause corrugated paper to collapse and damage.

SUMMARY OF THE INVENTION

The first object of the present invention is to provide a method for preparing a waterproof corrugated board, and the obtained corrugated board has good waterproof and moisture-proof performance.

For realizing the first purpose, the present invention provides the following technical solutions:

A preparation method of waterproof corrugated cardboard, the waterproof corrugated cardboard comprises a corrugated cardboard core and a face paper and a lining paper adhered and fixed on the upper and lower surfaces of the corrugated cardboard core, and the preparation method of the corrugated cardboard comprises the following steps:

S1. Preparation of waterproof coating;

S2. Preparation of corrugated cardboard core: control the base paper to enter the preheating zone smoothly with appropriate tension, the base paper after preheating treatment enters the waterproof treatment zone, and use a coating roller to coat the upper and lower surfaces of the base paper with waterproof material, so that the upper and lower surfaces of the base paper can be coated with waterproof material. A waterproof layer is formed, and the coating amount of the waterproof coating on the upper and lower surfaces of the base paper is (1.6-1.9) g/m ² , and then the base paper coated with the waterproof coating is dried to cure the waterproof layer; The heated base paper is embossed to form a UV-type corrugated core;

S3. Treatment of face paper and lining paper: preheat the face paper and lining paper respectively, the preheating temperature is 102-104℃, and then evenly apply a layer of waterproof coating on the upper and lower surfaces of the face paper and the upper and lower surfaces of the lining paper , so that the upper and lower surfaces of the face paper and the upper and lower surfaces of the lining paper form a waterproof layer, and then use an oven to dry the waterproof layer coated with the face paper and the waterproof layer of the lining paper to cure the waterproof layer; The coating amount of the waterproof coating on the surface of the corrugated paper core is (2.1-2.3) g/m ² , and the coating amount of the waterproof coating on the surface of the face paper and the inner paper facing the corrugated paper core is both (1.6-1.9) g/m ² ;

S4. Gluing and compounding: apply adhesive on the corrugated peaks of the corrugated cardboard core, press the face paper and the inner paper on both sides of the corrugated cardboard core, the pressure value ranges between 3-4N, and dry at 110-115 ℃ 1.5-2h, to obtain semi-finished waterproof corrugated paper;

S5. Preparation of semi-finished waterproof corrugated cardboard: according to the required size, use a vertical and horizontal cutting machine to cut the dried semi-finished waterproof corrugated cardboard into a finished semi-finished waterproof corrugated cardboard;

S6. Apply waterproof paint laterally: apply the waterproof paint to the side of the semi-finished waterproof corrugated cardboard with a vertically arranged paint roller, and the coating amount of the waterproof paint on the side is (1.3-1.5) g/m ² , Then, the semi-finished corrugated cardboard coated with the waterproof coating on the side is dried in an oven, and finally the waterproof corrugated cardboard is obtained.

Using the above technical solution, the waterproof coating is first prepared, and then the base paper is controlled to enter the preheating zone smoothly with appropriate tension, so that the base paper can be heated evenly, and at the same time, the wrinkle of the base paper is avoided. The coating roller coats the upper and lower surfaces of the base paper with waterproof coating, and the preheated base paper can be better combined with the waterproof coating; in the next step, the base paper is dried to cure the waterproof coating on the upper and lower surfaces of the base paper and form a waterproof layer. Then preheat the face paper and the lining paper, and then coat the upper and lower surfaces of the face paper and the upper and lower surfaces of the base paper with waterproof coating, and then glue the face paper, the lining paper and the corrugated paper core. Semi-finished corrugated paper; finally, a vertically arranged coating roller is used to coat the side of the semi-finished waterproof corrugated paper with waterproof coating, so that the side of the semi-finished corrugated paper can also form a waterproof layer, and then dried and cut to obtain the waterproof corrugated cardboard, in the present invention By applying waterproof coating to the base paper, face paper and lining paper, it is beneficial to improve the waterproof performance of the base paper, face paper and lining paper. At the same time, in step S5, the side of the semi-finished corrugated paper is coated with waterproof coating, which is beneficial to improve the semi-finished corrugated paper. The waterproof performance is conducive to reducing the water seepage on the side of the waterproof corrugated cardboard.

Further, the range of tension in step S2 is controlled within 4kg-8kg.

With the above technical solution, when the tension in step S2 is controlled between 4kg and 8kg, the base paper can enter the preheating zone smoothly, while ensuring that the mechanical properties of the base paper are not affected.

Further, the preheating temperature of the base paper is 85-95°C, and the preheating time is 0.5-1h.

Using the above technical solution, the preheating temperature of the base paper is controlled at 85-95°C, which on the one hand is conducive to better bonding of the subsequent waterproof coating to the surface of the base paper, and on the other hand, it is beneficial to avoid sudden temperature increase and damage to the structure of the base paper.

Further, in step S2, the temperature at which the base paper coated with the waterproof coating is dried is 80-85°C.

Using the above technical solution, the temperature of drying the base paper coated with the waterproof coating is controlled at 80-85 °C, which is conducive to the gradual curing of the waterproof layer, so that the waterproof layer is uniformly heated, thereby ensuring the softness and flatness of the waterproof layer. It is beneficial to avoid overheating and damage to the structure of the waterproof layer.

Further, the thickness of the waterproof layer of the base paper is in the range of 0.5-1.2 mm.

By adopting the above technical solution, under the condition of ensuring the waterproof effect of the base paper, it is beneficial to prevent the waterproof layer from being too thick and affecting the embossing treatment of the corrugated cardboard core.

Further, the waterproof coating includes the following components expressed in parts by mass:

Polyurethane resin emulsion 50-70 parts

10-15 servings of rice husk powder

5-10 parts of silicone oil

1-2 parts of defoamer

1-3 parts of dispersant

2-3 parts of film-forming aids.

Using the above technical solution, the polyurethane resin emulsion is used as the main component of the waterproof coating, and the rice husk powder plays a filling role, which is beneficial to improve the structural strength of the waterproof layer formed by the waterproof coating; the defoamer can eliminate the tiny air bubbles in the waterproof coating, improve the The smoothness of the waterproof layer is beneficial to improve the structural strength of the waterproof layer; the addition of silicone oil is beneficial to improve the softness of the waterproof layer, and at the same time, it is beneficial to further improve the waterproof performance of the waterproof layer.

Further, the waterproof coating also includes 2-8 parts by mass of rosin emulsion.

Using the above technical solution, the addition of the rosin emulsion is beneficial to improve the adhesion between the waterproof layer and the base paper, the face paper and the lining paper on the one hand, and to improve the softness of the waterproof layer on the other hand.

Further, the silicone oil is a mixture of amino silicone oil, polyether modified silicone oil and hydroxyl silicone oil in a weight ratio of 1.2-1.5:1:1.9-2.3.

By adopting the above technical scheme, the amino silicone oil in the silicone oil can increase the softness of the waterproof layer, and at the same time is beneficial to improve the elasticity of the waterproof layer, and the hydroxyl modified silicone oil can make the softness of the waterproof layer better. The silicone oil and the hydroxy silicone oil are compounded according to a mass ratio in a specific range to obtain the silicone oil, which is beneficial to further improve the waterproof performance and softness of the waterproof layer.

Further, the mesh range of the rice husk powder is 250-350 mesh.

By adopting the above technical scheme, the mesh number range of the rice husk powder is controlled within 250-350 mesh, which is beneficial to improve the structural strength of the waterproof layer.

The second object of the present invention is to provide a waterproof corrugated board, and the obtained corrugated board has good waterproof and moisture-proof performance.

For realizing the second purpose, the present invention provides the following technical solutions:

A waterproof corrugated board is prepared by the above-mentioned preparation method of waterproof corrugated board.

To sum up, the present invention has the following beneficial effects:

1. First prepare the waterproof coating, and then control the base paper to enter the preheating zone smoothly with appropriate tension, so that the base paper can be heated evenly, and at the same time avoid the wrinkling of the base paper. The upper and lower surfaces of the base paper are coated with waterproof coating, and the preheated base paper can be better combined with the waterproof coating; in the next step, the base paper is dried to cure the waterproof coating on the upper and lower surfaces of the base paper and form a waterproof layer, and then the opposite The paper and the lining paper are preheated, and then the upper and lower surfaces of the opposite paper and the upper and lower surfaces of the base paper are coated with waterproof coating, and then the surface paper, the lining paper and the corrugated core are glued and dried to obtain the semi-finished corrugated paper; Finally, a vertically arranged coating roller is used to coat the side of the semi-finished waterproof corrugated paper with waterproof coating, so that the side of the semi-finished corrugated paper can also form a waterproof layer, and then dried and cut to obtain a waterproof corrugated board. , the face paper and the lining paper are coated with waterproof coating, which is beneficial to improve the waterproof performance of the base paper, the face paper and the lining paper. At the same time, in step S5, the side of the semi-finished corrugated paper is coated with waterproof coating, which is conducive to improving the waterproof performance of the semi-finished corrugated paper. It is beneficial to reduce the water seepage on the side of the waterproof corrugated cardboard.

2. The drying temperature of the base paper coated with the waterproof coating is controlled at 80-85 °C, which is conducive to the gradual curing of the waterproof layer, so that the waterproof layer is evenly heated, thereby ensuring the softness and flatness of the waterproof layer, which is conducive to avoiding overheating. And destroy the structure of the waterproof layer.

3. The polyurethane resin emulsion is the main component of the waterproof coating, and the rice husk powder plays a filling role, which is beneficial to improve the structural strength of the waterproof layer formed by the waterproof coating; the defoamer can eliminate the tiny air bubbles in the waterproof coating and improve the waterproof layer. Smoothness, and is conducive to improving the structural strength of the waterproof layer; the addition of silicone oil is conducive to improving the softness of the waterproof layer, and is conducive to further improving the waterproof performance of the waterproof layer.

Description of drawings

Fig. 1 is the flow chart of the preparation method of waterproof corrugated board of the present invention.

Detailed ways

The present invention will be further described in detail below with reference to FIG. 1 and the embodiments.

In the following examples, the adhesive adopts the water-based adhesive of model G-305 sold by Foshan Dezhong Chemical Technology Co., Ltd.

In the following examples, the dispersant is a conventional film-forming aid in the art.

In the following examples, the film-forming aid is ethylene glycol.

Table 1 Components and parts by mass of the waterproof coating.

Example 1

The utility model relates to a waterproof corrugated cardboard. The waterproof corrugated cardboard comprises a corrugated cardboard core, and face paper and lining paper which are adhered and fixed on the upper and lower surfaces of the corrugated cardboard core.

A preparation method of waterproof corrugated cardboard, see Fig. 1, the preparation method of corrugated cardboard comprises the following steps:

S1, the preparation of waterproof coating: the waterproof coating is made by the components in Table 1 according to the following method: put the polyurethane resin emulsion, silicone oil and dispersant of corresponding mass parts into the reaction kettle, and stir 8min under the rotating speed of 500r/min , and then add the corresponding mass of rice husk powder, and the mesh number of the rice husk powder is 100 meshes. Continue to stir for 10 minutes, add a corresponding mass of defoamer, stir uniformly for 8 minutes, add a corresponding mass of film-forming aid while stirring, raise the temperature to 40°C, and mix evenly to obtain a waterproof coating. In this embodiment, the silicone oil is amino silicone oil. The amino silicone oil was the amino silicone oil of DM-8040 in Qingdao Meiside Organic Silicon Co., Ltd.

S2. Preparation of corrugated cardboard core: control the base paper to enter the preheating zone with a tension of 3kg, and the base paper after preheating treatment enters the waterproof treatment zone. The upper and lower surfaces of the base paper are coated with waterproof material by a coating roller, and the waterproof coating on the upper and lower surfaces of the base paper. The coating amount is 1.6g/m ² to form a waterproof layer on the upper and lower surfaces of the base paper, and then the base paper coated with the waterproof coating is dried at a temperature of 80°C to cure the waterproof layer; The corrugating roller embosses the heated base paper to form a UV-type corrugated paper core.

S3. Treatment of face paper and lining paper: Preheat the face paper and lining paper respectively, the preheating temperature is 102℃, and then evenly apply a layer of waterproof coating on the upper and lower surfaces of the face paper and the upper and lower surfaces of the lining paper to make A waterproof layer is formed on the upper and lower surfaces of the face paper and the upper and lower surfaces of the lining paper, and then the waterproof layer coated with the face paper and the waterproof layer of the lining paper are dried in an oven to cure the waterproof layer. Among them, the coating amount of the waterproof coating on the surface of the top paper and the lining paper away from the corrugated paper core is both 2.1g/m ² , and the coating amount of the waterproof coating on the surface of the top paper and the lining paper facing the corrugated paper core is both 1.6g/m2 ² .

S4. Gluing and compounding: apply adhesive on the corrugated peaks of the corrugated cardboard core, press the face paper and the inner paper on both sides of the corrugated cardboard core respectively, the pressure value is 3N, and dry it at 110 ° C for 1.5 hours to obtain a semi-finished product waterproof corrugated paper.

S5. Preparation of semi-finished waterproof corrugated cardboard: according to the required size, use a vertical and horizontal cutting machine to cut the dried semi-finished waterproof corrugated cardboard into semi-finished waterproof corrugated cardboard.

S6. Apply waterproof coating laterally: use a vertically arranged coating roller to coat the side of the semi-finished waterproof corrugated cardboard with waterproof coating, and the coating amount of the waterproof coating on the side is 1.3 g/m ² . Then, the semi-finished corrugated cardboard coated with the waterproof coating on the side is dried in an oven at a drying temperature of 65° C., and finally a waterproof corrugated cardboard is obtained.

The thickness of the waterproof layer of the base paper was 0.5 mm.

Example 2

The utility model relates to a waterproof corrugated cardboard. The waterproof corrugated cardboard comprises a corrugated cardboard core, and face paper and lining paper which are adhered and fixed on the upper and lower surfaces of the corrugated cardboard core.

A preparation method of waterproof corrugated cardboard, see Fig. 1, and the difference with embodiment 1 is: the preparation method of corrugated cardboard comprises the following steps:

S1, the preparation of waterproof coating: the waterproof coating is made by the components in table 1 according to the following method: put the polyurethane resin emulsion, rosin emulsion, silicone oil and dispersant of corresponding mass parts into the reaction kettle, at the rotating speed of 500r/min Stir for 10 minutes, then add the corresponding mass portion of rice husk powder, continue to stir for 10 minutes, add the corresponding mass portion of defoaming agent, stir evenly for 5 minutes, add the corresponding mass portion of the film-forming aid while stirring, and raise the temperature to 42°C, mixed evenly, and the waterproof coating was obtained.

S2. Preparation of corrugated paper core: control the base paper to enter the preheating zone with a tension of 4kg, and the base paper after preheating treatment enters the waterproof treatment zone. The upper and lower surfaces of the base paper are coated with waterproof material by a coating roller, and the waterproof coating on the upper and lower surfaces of the base paper. The coating amount is 1.7g/m ² to form a waterproof layer on the upper and lower surfaces of the base paper, and then the base paper coated with the waterproof coating is dried at a drying temperature of 83°C to cure the waterproof layer; The corrugating roller embosses the heated base paper to form a UV-type corrugated paper core.

S3. Treatment of face paper and lining paper: Preheat the face paper and lining paper respectively, the preheating temperature is 103℃, and then evenly apply a layer of waterproof coating on the upper and lower surfaces of the face paper and the upper and lower surfaces of the lining paper to make A waterproof layer is formed on the upper and lower surfaces of the face paper and the upper and lower surfaces of the lining paper, and then the waterproof layer coated with the face paper and the waterproof layer of the lining paper are dried in an oven to cure the waterproof layer. The coating amount of the waterproof coating on the surface of the top paper and the lining paper away from the corrugated paper core is both 2.2 g/m ² , and the coating amount of the waterproof coating on the surface of the top paper and the lining paper facing the corrugated paper core is both 1.7 g/m ² .

S4. Gluing and compounding: apply adhesive on the corrugated peaks of the corrugated cardboard core, press the surface paper and the inner paper on both sides of the corrugated cardboard core respectively, the pressure value is 3.5N, and dry at 113 ° C for 1.7 hours to obtain a semi-finished product Waterproof corrugated paper.

S5. Preparation of semi-finished waterproof corrugated cardboard: according to the required size, use a vertical and horizontal cutting machine to cut the dried semi-finished waterproof corrugated cardboard into semi-finished waterproof corrugated cardboard.

S6. Apply waterproof coating laterally: use a vertically arranged coating roller to coat the side of the semi-finished waterproof corrugated cardboard with waterproof coating, and the coating amount of the waterproof coating on the side is 1.4g/m ² . Then, the semi-finished corrugated cardboard coated with the waterproof coating is dried in an oven at a drying temperature of 70° C., and finally a waterproof corrugated cardboard is obtained.

The thickness of the waterproof layer of the base paper was 0.8 mm.

Example 3

The utility model relates to a waterproof corrugated cardboard. The waterproof corrugated cardboard comprises a corrugated cardboard core, and face paper and lining paper which are adhered and fixed on the upper and lower surfaces of the corrugated cardboard core.

A preparation method of waterproof corrugated cardboard, see Fig. 1, the difference with embodiment 2 is: the preparation method of corrugated cardboard comprises the following steps:

S1, the preparation of waterproof coating: the waterproof coating is made by the components in table 1 according to the following method: put the polyurethane resin emulsion, rosin emulsion, silicone oil and dispersant of corresponding mass parts into the reaction kettle, at the rotating speed of 500r/min Stir for 15 minutes, then add the corresponding mass portion of rice husk powder, continue to stir for 15 minutes, add the corresponding mass portion of defoaming agent, stir evenly for 5 minutes, add the corresponding mass portion of the film-forming aid while stirring, and raise the temperature to 45 ℃, mix evenly, namely obtain waterproof coating.

S2. Preparation of corrugated paper core: control the base paper to enter the preheating zone flat with 6kg tension, the base paper preheating temperature is 85℃, and the preheating time is 0.5h. ^The preheated base paper enters the waterproof treatment area, and the upper and lower surfaces of the base paper are coated with waterproof material by coating rollers. Layer waterproof layer, and then dry the base paper coated with waterproof coating at a drying temperature of 85 ° C to cure the waterproof layer; then emboss the heated base paper with a corrugating roller to form a UV-type corrugated paper core .

S3. Treatment of face paper and lining paper: Preheat the face paper and lining paper respectively, the preheating temperature is 104℃, and then evenly apply a layer of waterproof coating on the upper and lower surfaces of the face paper and the upper and lower surfaces of the lining paper to make A waterproof layer is formed on the upper and lower surfaces of the face paper and the upper and lower surfaces of the lining paper, and then the waterproof layer coated with the face paper and the waterproof layer of the lining paper are dried in an oven to cure the waterproof layer. The coating amount of the waterproof coating on the surface of the top paper and the lining paper away from the corrugated paper core is both 2.3 g/m ² , and the coating amount of the waterproof coating on the surface of the top paper and the lining paper facing the corrugated paper core is both 1.9 g/m ² .

S4. Gluing and compounding: apply adhesive on the corrugated peaks of the corrugated cardboard core, press the face paper and the inner paper on both sides of the corrugated cardboard core, respectively, with a pressure value of 4N, and dry it at 115 °C for 2 hours to obtain semi-finished waterproof corrugated paper. .

S5. Preparation of semi-finished waterproof corrugated cardboard: according to the required size, use a vertical and horizontal cutting machine to cut the dried semi-finished waterproof corrugated cardboard into semi-finished waterproof corrugated cardboard.

S6. Apply waterproof coating laterally: use a vertically arranged coating roller to coat the side of the semi-finished waterproof corrugated cardboard with waterproof coating, and the coating amount of the waterproof coating on the side is 1.5g/m ² . Then, the semi-finished corrugated cardboard coated with the waterproof coating is dried in an oven at a drying temperature of 73° C., and finally a waterproof corrugated cardboard is obtained.

The thickness of the waterproof layer of the base paper was 1.2 mm.

Example 4

A preparation method of waterproof corrugated cardboard, the difference from Example 3 is:

Among the components of the waterproof coating, the silicone oil is a mixture of amino silicone oil, polyether modified silicone oil and hydroxyl silicone oil in a weight ratio of 1.2:1:1.9. The polyether-modified silicone oil adopts the polyether-modified silicone oil of Qingdao Meiside Organic Silicon Co., Ltd., the model is DM-204; the amino silicone oil adopts the amino-silicone oil of Qingdao Meiside Silicone Co., Ltd., the model is DM-8040; Hydroxy silicone oil adopts the hydroxyl silicone oil of Dongguan Jiechen Chemical Co., Ltd., model AA-203.

In step S2, the preheating temperature of the base paper is 90°C, and the preheating time is 0.75h; at the same time, the base paper is controlled to enter the preheating zone smoothly with a tension of 8kg.

Example 5

A preparation method of waterproof corrugated cardboard, the difference from Example 4 is:

In the components of the waterproof coating, the silicone oil is a mixture of amino silicone oil, polyether modified silicone oil and hydroxyl silicone oil in a weight ratio of 1.2:1:2.3.

In step S2, the preheating temperature of the base paper is 95°C, and the preheating time is 1 h.

The mesh number of rice husk powder is 250 mesh.

Example 6

A preparation method of waterproof corrugated cardboard, the difference from Example 5 is:

Among the components of the waterproof coating, the silicone oil is a mixture of amino silicone oil, polyether modified silicone oil and hydroxyl silicone oil in a weight ratio of 1.5:1:2.3.

The mesh number of rice husk powder is 325 mesh.

Example 7

A preparation method of waterproof corrugated board, the difference from Example 6 is: in the components of the waterproof coating, the silicone oil is a mixture of amino silicone oil, polyether modified silicone oil and hydroxyl silicone oil in a weight ratio of 1.5:1:1.9 .

The mesh number of rice husk powder is 350 mesh.

Example 8

A preparation method of waterproof corrugated cardboard, the difference with embodiment 7 is:

Among the components of the waterproof coating, the silicone oil is a mixture of amino silicone oil, polyether modified silicone oil and hydroxyl silicone oil in a weight ratio of 1.3:1:2.2.

Comparative Example 1

A preparation method of waterproof corrugated cardboard, the difference from Example 5 is that: in step S2, the base paper is controlled to enter the waterproof treatment area flat with a tension of 4kg, and the upper and lower surfaces of the base paper are coated with a waterproof material by using a coating roller. A waterproof layer is formed on the upper and lower surfaces, and then the base paper coated with the waterproof coating is dried to cure the waterproof layer; then the heated base paper is embossed with a corrugating roller to form a UV-type corrugated core.

Comparative Example 2

A preparation method of waterproof corrugated cardboard, the difference from Example 5 is that the tension range in step S2 is controlled at 12kg.

Comparative Example 3

A preparation method of waterproof corrugated board, the difference from Example 5 is that step S6 is not adopted.

Comparative Example 4

A preparation method of waterproof corrugated board, the difference from Example 5 is that the thickness range of the waterproof layer of the base paper is 2 mm.

Comparative Example 5

A waterproof corrugated board and a preparation method thereof, the difference from Example 5 is that the silicone oil in the waterproof coating is a mixture of amino silicone oil, polyether modified silicone oil and hydroxyl silicone oil in a weight ratio of 3:1:2.

Comparative Example 6

A kind of waterproof corrugated board and preparation method thereof, the difference from Example 5 is that the mesh number of rice husk powder is 80 meshes.

Comparative Example 7

As Comparative Example 7, a commercially available waterproof corrugated board was used.

The detection data of each embodiment and comparative example are shown in Table 2.

Corrugated cardboards were prepared according to Examples 1-8 and these corrugated cardboards were designated as Samples 1-8, and corrugated cardboards were prepared according to Comparative Examples 1-7 and these corrugated cardboards were designated as Samples 9-15, Sample 1- The length, width and thickness of 15 are the same, and the properties of samples 1-15 are tested according to the following testing methods, and then the corrugated cardboard is put into tap water at 20±2 °C and soaked for 1 hour (the distance between the position of the sample water surface at least 30mm), test the performance of samples 1-15 again, and record the test results in Table 2:

1. Water absorption: Test according to GB/T1540-2002 "Determination of Water Absorption of Paper and Cardboard" to test the waterproof performance of samples 1-15.

2. Bursting strength: Test according to GB/T6545-1998 "Determination of Bursting Strength of Corrugated Cardboard Board" to test the wear resistance of samples 1-15.

3. Punch strength: Test according to GB/T2679.7-2005 "Determination of Punch Strength of Cardboard" to detect the puncture strength of samples 1-15.

4. Edge compressive strength: Test according to GB/T6546-1998 "Determination of Edge Compression Strength of Corrugated Cardboard Board" to detect the edge compressive strength of samples 1-15.

5. Softness test: set a crease on the surface of sample 1-15 at the same position, and fold sample 1-15 around the crease repeatedly, when the waterproof layer of sample 1-15 breaks Stop folding and record the number of folds of samples 1-15. The greater the number of folds, the better the softness of the corrugated board.

Table 2 Performance test results of samples 1-15.

According to the test data of sample 1 and sample 2-8 in Table 2, the water absorption of sample 1 is greater than that of sample 2-8, and the softness of sample 1 is lower than that of sample 2-8. . This shows that the addition of rosin emulsion is beneficial to improve the adhesion between the waterproof layer and the base paper, face paper and lining paper on the one hand, and to improve the softness of the waterproof layer on the other hand.

According to the test data of sample 1, sample 2-8 and sample 10 in Table 2, when the tension in step S2 is controlled between 4kg-8kg, the base paper can enter the preheating zone smoothly, and the Mechanical properties are not affected. When the tension control is less than 4kg, it will affect the smooth entry of the base paper into the preheating zone, resulting in uneven distribution of the waterproof coating on the surface of the base paper, which may easily lead to the phenomenon of missing coating on the wrinkled part of the base paper, which may easily lead to a decrease in the waterproof performance of the base paper. When the tension control is greater than 8kg, the stretching of the base paper is too large, which is easy to affect the structural strength of the base paper, and it is easy to make the structural strength of the corrugated cardboard core produced subsequently poor.

According to the test data of sample 5 and sample 9 in Table 2, it can be seen that the preheated base paper enters the waterproof treatment area, and the upper and lower surfaces of the base paper are coated with waterproof coating by the coating roller, and the preheated base paper can be better combined with waterproof paint. When the base paper without preheating treatment is coated with waterproof coating, the waterproof coating is not easy to combine with the surface of the base paper, which makes it easy to form a gap between the waterproof layer and the surface of the base paper, thus affecting the waterproof performance of the base paper.

According to the test data of samples 1-8 and 11 in Table 2, it can be seen that the water absorption of sample 11 is greater than that of samples 1-8. It can be seen that after cutting the corrugated cardboard, a vertically arranged coating is used. The rollers apply waterproof coating to the side of the semi-finished waterproof corrugated paper, so that the side of the semi-finished corrugated paper can also form a waterproof layer, which is beneficial to avoid the infiltration of water from the side of the corrugated cardboard, and is beneficial to further improve the overall waterproof performance of the corrugated cardboard.

According to the test data of sample 5 and sample 12 in Table 2, it can be seen that the waterproof layer of the base paper is controlled at 0.5-1.2mm, so that it is set under the condition of ensuring the waterproof effect of the base paper, which is beneficial to avoid the excessive thickness of the waterproof layer and affect the corrugated paper. Embossing of the core. When the thickness of the waterproof layer of the base paper is greater than 1.2mm, when the base paper is embossed, it is easy to affect the embossing treatment of the corrugated paper core because the waterproof layer is too thick.

According to the test data of sample 5 and sample 13 in Table 2, the amino silicone oil in the silicone oil can increase the flexibility of the waterproof layer and at the same time help to improve the elasticity of the waterproof layer, and the hydroxyl-modified silicone oil has the ability to make the waterproof layer soft. Preferably, the silicone oil is obtained by compounding amino silicone oil, polyether modified silicone oil and hydroxyl silicone oil in a mass ratio within a specific range, which is beneficial to further improve the waterproof performance and softness of the waterproof layer.

According to the test data of sample 5 and sample 14 in Table 2, it can be seen that the rice husk powder plays a filling role, which is beneficial to improve the structural strength of the waterproof layer formed by the waterproof coating. 350 mesh, so that the rice husk powder can be more evenly distributed in the raw material system of the waterproof coating, which is beneficial to improve the structural strength of the waterproof layer. When the mesh number of the rice husk powder is less than 250 mesh, the filling of the rice husk powder in the raw material system The effect is reduced, resulting in a reduction in the structural strength of the waterproof layer.

Sample 15 is made of commercially available waterproof corrugated cardboard. According to the test data of sample 5 and sample 15 in Table 2, it can be seen that the water absorption in sample 15 is higher than that of samples 1-8, and in the test After the sample 15 is soaked in water, the burst strength, puncture strength and edge compression strength of the sample 15 are all lower than those of the samples 1-8, and the softness of the sample 15 is much smaller than that of the samples 1-8. According to the invention, the waterproof coating prepared according to the specific components and parts by mass and the waterproof corrugated cardboard prepared by the specific preparation steps have good waterproof performance and softness.

The above-mentioned embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. Those skilled in the art can make modifications without creative contribution to the present embodiment as required after reading this specification, but only in the claims of the present invention. are protected by patent law.

Claims (10)

1. a preparation method of waterproof corrugated cardboard, it is characterized in that: waterproof corrugated cardboard comprises corrugated cardboard core and the face paper and lining paper that are adhered and fixed on the upper and lower surfaces of corrugated cardboard core, and the preparation method of corrugated cardboard may further comprise the steps: S1. Preparation of waterproof coating; S2. Preparation of corrugated cardboard core: control the base paper to enter the preheating zone smoothly with appropriate tension, the base paper after preheating treatment enters the waterproof treatment zone, and use a coating roller to coat the upper and lower surfaces of the base paper with waterproof material, so that the upper and lower surfaces of the base paper can be coated with waterproof material. A waterproof layer is formed, and the coating amount of the waterproof coating on the upper and lower surfaces of the base paper is (1.6-1.9) g/m ² , and then the base paper coated with the waterproof coating is dried to cure the waterproof layer; The heated base paper is embossed to form a UV-type corrugated core; S3. Treatment of face paper and lining paper: preheat the face paper and lining paper respectively, the preheating temperature is 102-104℃, and then evenly apply a layer of waterproof coating on the upper and lower surfaces of the face paper and the upper and lower surfaces of the lining paper , so that the upper and lower surfaces of the face paper and the upper and lower surfaces of the lining paper form a waterproof layer, and then use an oven to dry the waterproof layer coated with the face paper and the waterproof layer of the lining paper to cure the waterproof layer; The coating amount of the waterproof coating on the surface of the corrugated cardboard core is (2.1-2.3) g/m ² , and the coating amount of the waterproof coating on the surface of the face paper and the inner paper facing the corrugated cardboard core is both (1.6-1.9) g/m ² ; S4. Gluing and compounding: apply adhesive on the corrugated peaks of the corrugated cardboard core, press the face paper and the inner paper on both sides of the corrugated cardboard core, the pressure value ranges between 3-4N, and dry at 110-115 ℃ 1.5-2h, to obtain semi-finished waterproof corrugated paper; S5. Preparation of semi-finished waterproof corrugated cardboard: according to the required size, use a vertical and horizontal cutting machine to cut the dried semi-finished waterproof corrugated cardboard into a finished semi-finished waterproof corrugated cardboard; S6. Lateral coating of waterproof coating: use a vertically arranged coating roller to coat the side of the semi-finished waterproof corrugated cardboard with waterproof coating, and the coating amount of the waterproof coating on the side is (1.3-1.5) g/m ² , Then, the semi-finished corrugated cardboard coated with the waterproof coating on the side is dried in an oven, and finally the waterproof corrugated cardboard is obtained. 2. the preparation method of a kind of waterproof corrugated cardboard according to claim 1, is characterized in that: in step S2, the scope of tension is controlled at 4kg-8kg. 3 . The method for preparing a waterproof corrugated board according to claim 1 , wherein the preheating temperature of the base paper is 85-95° C., and the preheating time is 0.5-1 h. 4 . 4 . The method for preparing a waterproof corrugated board according to claim 1 , wherein in step S2 , the temperature at which the base paper coated with the waterproof coating is dried is 80-85° C. 5 . 5 . The method for preparing a waterproof corrugated board according to claim 1 , wherein the thickness of the waterproof layer of the base paper ranges from 0.5 to 1.2 mm. 6 . 6. the preparation method of a kind of waterproof corrugated cardboard according to claim 1, is characterized in that: described waterproof coating comprises the following components represented by mass parts: Polyurethane resin emulsion 50-70 parts 10-15 servings of rice husk powder 5-10 parts of silicone oil 1-2 parts of defoamer 1-3 parts of dispersant 2-3 parts of film-forming aids. 7 . The method for preparing a waterproof corrugated board according to claim 6 , wherein the waterproof coating further comprises 2-8 parts by mass of rosin emulsion. 8 . 8. The preparation method of a waterproof corrugated board according to claim 6, wherein the silicone oil is composed of amino silicone oil, polyether modified silicone oil and hydroxyl silicone oil in a weight ratio of 1.2-1.5:1:1.9- 2.3 Composition of the mixture. 9 . The method for preparing a waterproof corrugated cardboard according to claim 6 , wherein the mesh range of the rice husk powder is 250-350 mesh. 10 . 10. A waterproof corrugated cardboard, characterized in that: it is made by the method for preparing a waterproof corrugated cardboard according to any one of claims 1-9.

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