Adhesive for composite corrugated board

Abstract

This application relates to the technical field of adhesive preparation, specifically disclosing an adhesive for composite corrugated cardboard. The adhesive comprises the following components by weight: 80-120 parts starch, 1-4 parts sodium hydroxide, 1-2 parts borax, 15-25 parts glass fiber, and 250-350 parts water. The sodium hydroxide in the adhesive fully gelatinizes the starch, the borax provides a cross-linking effect, increasing the adhesive's viscosity, and the glass fiber provides high mechanical strength, thereby enhancing the compressive strength of the corrugated cardboard produced using the adhesive.

Description

Technical Field

[0001] The present application relates to the technical field of adhesive preparation, and in particular to an adhesive for composite corrugated cardboard. Background Art

[0002] Driven by the trend toward green packaging, corrugated cardboard packaging is gradually becoming thinner and more robust. "Compound corrugated" replaces a single sheet of conventional cardboard with two sheets bonded together, effectively increasing both its ring and flat crush strengths. However, in some specialized applications, conventional corrugated cardboard requires further improvements in its compressive strength. Summary of the Invention

[0003] In order to improve the compressive strength of the produced corrugated cardboard, the present application provides an adhesive for composite corrugated cardboard.

[0004] The present application provides an adhesive for composite corrugated cardboard, which adopts the following technical solution:

[0005] The invention discloses an adhesive for composite corrugated cardboard. The raw materials of the adhesive include the following components in parts by weight: 80-120 parts of starch, 1-4 parts of sodium hydroxide, 1-2 parts of borax, 15-25 parts of glass fiber, and 250-350 parts of water.

[0006] By adopting the above technical solution, sodium hydroxide makes the starch fully gelatinized, borax plays a certain cross-linking role, and increases the viscosity of the adhesive, and the glass fiber has a higher mechanical strength, thereby improving the compressive strength of the corrugated cardboard made from the adhesive.

[0007] In a specific embodiment, the glass fiber is a mixture of chopped fibers and milled fibers, the length of the chopped fibers is 2.5-3.5 mm, and the particle size of the milled fibers is 15-25 meshes.

[0008] By adopting the above technical solution, the glass fiber is selected to be a mixture of chopped fibers and ground fibers. The chopped fibers are distributed between two sheets of corrugated paper, and then the ground fibers are filled between two adjacent chopped fibers to form a structural network, thereby improving the compressive strength of the corrugated board.

[0009] In a specific embodiment, the weight ratio of the chopped fibers to the milled fibers is 1:(8-12).

[0010] In a specific embodiment, the weight ratio of the glass fiber to the starch is 1:(4.5-5.5).

[0011] By adopting the above technical solution, the present application further defines the ratio of chopped fibers to ground fibers, and the ratio of glass fibers to starch, thereby further improving the compressive strength of the corrugated board.

[0012] In a specific embodiment, the raw materials of the binder further include 0.01-0.1 parts by weight of sodium hexametaphosphate.

[0013] By adopting the above technical solution, sodium hexametaphosphate allows the glass fibers to be evenly dispersed in the binder, thereby facilitating the formation of a structural network.

[0014] In a specific embodiment, the raw materials of the binder further include 0.4-0.8 parts by weight of sodium isooctanoate.

[0015] By adopting the above technical solution and adding sodium isooctanoate, the drying time of the adhesive is shortened, thereby improving the stiffness of the corrugated board.

[0016] In a specific embodiment, the preparation method of the binder comprises the following steps:

[0017] First, take part of the water and part of the starch and stir them evenly, then add sodium hydroxide and stir evenly to obtain a carrier liquid;

[0018] Stir the remaining water and the remaining starch to mix evenly, then add borax and stir evenly to obtain the main liquid;

[0019] The carrier liquid is added to the main liquid, and then glass fiber, sodium hexametaphosphate and sodium isooctanoate are added, and the mixture is stirred evenly to obtain a binder.

[0020] By adopting the above technical solution, part of the water is first mixed with part of the starch, and then sodium hydroxide is added to obtain a carrier liquid. The remaining water is then mixed with the remaining starch, and borax is added to obtain a main liquid. Finally, the carrier liquid is added to the main liquid, and then glass fiber, sodium hexametaphosphate, and sodium isooctanoate are added to obtain a highly viscous adhesive.

[0021] In a specific embodiment, the weight ratio of the starch in the carrier liquid to the starch in the main liquid is 1:(7-8).

[0022] By adopting the above technical solution, the ratio of the starch added twice is further limited, thereby improving the performance of the prepared adhesive.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. In this application, sodium hydroxide fully gelatinizes the starch, borax plays a certain cross-linking role, increases the viscosity of the binder, and the glass fiber has high mechanical strength, thereby improving the compressive strength of the corrugated board made with the binder;

[0025] 2. The glass fiber in this application is a mixture of chopped fibers and milled fibers. The chopped fibers are distributed between two sheets of corrugated paper, and then the milled fibers are filled between two adjacent chopped fibers to form a structural network, thereby improving the compressive strength of the corrugated paperboard.

[0026] 3. In this application, part of the water is first mixed with part of the starch, and then sodium hydroxide is added to obtain a carrier liquid. The remaining water is then mixed with the remaining starch, and borax is added to obtain a main liquid. Finally, the carrier liquid is added to the main liquid, and then glass fiber, sodium hexametaphosphate, and sodium isooctanoate are added to obtain a highly viscous adhesive. DETAILED DESCRIPTION

[0027] The present application is further described in detail below with reference to the embodiments.

[0028] All raw materials in the examples can be obtained from commercial sources. Among them, starch CAS number: 9005-25-8;

[0029] Borax CAS No.: 1303-96-4; Glass fiber CAS No.: 65997-17-3. The glass fiber is cut into chopped fibers, and the length of the chopped fibers is preferably 2.5-3.5 mm, and in the embodiment of the present application, it is 3 mm. The glass fiber is ground into ground fibers, and the particle size of the ground fibers is preferably 15-25 mesh, and in the embodiment of the present application, it is 20 mesh.

[0030] Example

[0031] Example 1

[0032] Example 1 provides a method for preparing an adhesive for composite corrugated cardboard, comprising the following steps:

[0033] First, take 30kg of water and 9.5kg of starch and stir and mix them evenly, then add 1kg of sodium hydroxide and stir and mix evenly to obtain a carrier liquid;

[0034] 220 kg of water and 70.5 kg of starch were stirred and mixed evenly, and then 1 kg of borax was added and stirred and mixed evenly to obtain a main liquid. The carrier liquid was slowly added to the main liquid, and then 15 kg of glass fiber was added and stirred and mixed evenly to obtain a binder. The glass fiber was a mixture of chopped fiber and milled fiber, and the weight ratio of chopped fiber to milled fiber was 1:6.

[0035] Example 2

[0036] Example 2 provides a method for preparing an adhesive for composite corrugated cardboard, comprising the following steps:

[0037] First, take 36 kg of water and 12 kg of starch and stir and mix them evenly, then add 2.5 kg of sodium hydroxide and stir and mix evenly to obtain a carrier liquid;

[0038] 264 kg of water and 88 kg of starch were stirred and mixed evenly, and then 1.5 kg of borax was added and stirred and mixed evenly to obtain a main liquid;

[0039] The carrier liquid is slowly added to the main liquid, and then 20 kg of glass fiber is added and stirred to mix evenly to obtain a binder. The glass fiber is a mixture of chopped fiber and milled fiber, and the weight ratio of the chopped fiber to the milled fiber is 1:6.

[0040] Example 3

[0041] Example 3 provides a method for preparing an adhesive for composite corrugated cardboard, comprising the following steps:

[0042] First, 40 kg of water and 14 kg of starch were mixed evenly, and then 4 kg of sodium hydroxide was added and mixed evenly to obtain a carrier liquid. 310 kg of water and 106 kg of starch were mixed evenly, and then 2 kg of borax was added and mixed evenly to obtain a main liquid. The carrier liquid was slowly added to the main liquid, and then 25 kg of glass fiber was added and mixed evenly to obtain a binder. The glass fiber was a mixture of chopped and milled fibers, with the weight ratio of chopped to milled fibers being 1:6.

[0043] Example 4

[0044] The difference between Example 4 and Example 2 is that 36 kg of water and 10 kg of starch are first mixed and stirred evenly, and then 2.5 kg of sodium hydroxide is added and stirred and mixed evenly to obtain a carrier liquid;

[0045] 264 kg of water and 80 kg of starch were stirred and mixed evenly, and then 1.5 kg of borax was added and stirred and mixed evenly to obtain a main liquid; the remaining steps were consistent with Example 2.

[0046] Example 5

[0047] The difference between Example 5 and Example 2 is that 36 kg of water and 14 kg of starch are first mixed and stirred evenly, and then 2.5 kg of sodium hydroxide is added and stirred and mixed evenly to obtain a carrier liquid;

[0048] 264 kg of water and 96 kg of starch were stirred and mixed evenly, and then 1.5 kg of borax was added and stirred and mixed evenly to obtain a main liquid; the remaining steps were consistent with Example 2.

[0049] Example 6

[0050] The difference between Example 6 and Example 2 is that the weight ratio of chopped fibers to milled fibers is 1:8, and the remaining steps are consistent with Example 2.

[0051] Example 7

[0052] The difference between Example 7 and Example 2 is that the weight ratio of chopped fibers to milled fibers is 1:10, and the remaining steps are consistent with Example 2.

[0053] Example 8

[0054] The difference between Example 8 and Example 2 is that the weight ratio of chopped fibers to milled fibers is 1:12, and the remaining steps are consistent with Example 2.

[0055] Example 9

[0056] The difference between Example 9 and Example 2 is that the weight ratio of chopped fibers to milled fibers is 1:14, and the remaining steps are consistent with Example 2.

[0057] Example 10

[0058] The difference between Example 10 and Example 7 is that the glass fiber is chopped fiber, and the remaining steps are consistent with Example 7.

[0059] Example 11

[0060] The difference between Example 11 and Example 7 is that the glass fiber is ground fiber, and the remaining steps are consistent with Example 7.

[0061] Example 12

[0062] The difference between Example 12 and Example 7 is that the carrier liquid is slowly added to the main liquid, and then 20 kg of glass fiber and 0.05 kg of sodium hexametaphosphate are added, and stirred and mixed evenly to obtain a binder; the remaining steps are consistent with Example 7.

[0063] Example 13

[0064] The difference between Example 13 and Example 12 is that the carrier liquid is slowly added to the main liquid, and then 20 kg of glass fiber, 0.05 kg of sodium hexametaphosphate, and 0.6 kg of sodium isooctanoate are added, and stirred and mixed evenly to obtain a binder; the remaining steps are consistent with Example 12.

[0065] Comparative Example

[0066] Comparative Example 1

[0067] Comparative Example 1 provides a method for preparing an adhesive for composite corrugated cardboard, comprising the following steps:

[0068] First, take 30kg of water and 11.5kg of starch and stir and mix them evenly, then add 1kg of sodium hydroxide and stir and mix evenly to obtain a carrier liquid;

[0069] 220 kg of water and 83.5 kg of starch were stirred and mixed evenly, and then 1 kg of borax was added and stirred and mixed evenly to obtain a main liquid; the carrier liquid was slowly added to the main liquid and stirred and mixed evenly to obtain a binder.

[0070] Comparative Example 2

[0071] Comparative Example 2 provides a method for preparing an adhesive for composite corrugated cardboard, comprising the following steps:

[0072] First, 250 kg of water and 81 kg of starch were stirred and mixed evenly, and then 1 kg of sodium hydroxide and 15 kg of glass fiber were added in sequence and stirred and mixed evenly to obtain a binder. The glass fiber was a mixture of chopped fiber and milled fiber, and the weight ratio of chopped fiber to milled fiber was 1:6.

[0073] Comparative Example 3

[0074] Comparative Example 3 provides a method for preparing an adhesive for composite corrugated cardboard, comprising the following steps:

[0075] First, 250 kg of water and 81 kg of starch were stirred and mixed evenly, and then 1 kg of borax and 15 kg of glass fiber were added in sequence and stirred and mixed evenly to obtain a binder. The glass fiber was a mixture of chopped fiber and milled fiber, and the weight ratio of the chopped fiber to the milled fiber was 1:6.

[0076] Application Examples

[0077] Application Example 1

[0078] The adhesive in Example 1 was used to bond two sheets of corrugated paper together to prepare a corrugated board.

[0079] Application Example 2-16

[0080] The difference between Application Example 2-16 and Application Example 1 lies in the different selection of adhesives, as shown in Table 1 for details.

[0081] Table 1 Selection of adhesives

[0082]

[0083]

[0084] Performance test: Compression performance test; the corrugated cardboard in each application example is placed in a constant temperature and humidity environment of 23°C and 50% RH for 24 hours, and then the treated samples are tested using a ring crush strength tester to obtain the ring crush strength. The higher the ring crush strength, the better the compression performance of the manufactured carton.

[0085] Table 2 Performance test results of corrugated cardboard

[0086] sample Ring crush strength (N / 0.152m) Application Example 1 685 Application Example 2 707 Application Example 3 692 Application Example 4 671 Application Example 5 662 Application Example 6 765 Application Example 7 788 Application Example 8 779 Application Example 9 718 Application Example 10 715 Application Example 11 756 Application Example 12 801 Application Example 13 825 Application Example 14 513 Application Example 15 621 Application Example 16 636

[0087] Combining Application Example 1 and Application Example 14, the ring crush strength of the paperboard in Application Example 1 is much greater than that in Application Example 14, so the compressive performance of the paperboard in Application Example 1 is better. It can be seen that when preparing the adhesive, adding glass fiber to the raw materials can improve the compressive performance of the obtained paperboard.

[0088] Combining Application Example 1 and Application Examples 15-16, the ring crush strength of the cardboard in Application Example 1 is the highest, and thus the compressive resistance of the cardboard in Application Example 1 is the best. It can be seen that when preparing the adhesive, sodium hydroxide and borax are added to the raw materials. Sodium hydroxide makes the starch fully gelatinized, and borax plays a certain cross-linking role, thereby increasing the viscosity of the adhesive, thereby improving the compressive resistance of the prepared cardboard.

[0089] Combining Application Examples 1-3, the ring crush strength of the cardboard in Application Example 2 is the highest, and thus the compressive performance of the cardboard in Application Example 2 is the best. It can be seen that when preparing the adhesive, increasing the amount of raw materials used will result in the compressive performance of the cardboard showing a trend of first increasing and then decreasing.

[0090] Combining Application Example 2 with Application Examples 4-5, the ring crush strength of the cardboard in Application Example 2 is the highest, and thus the compressive performance of the cardboard in Application Example 2 is the best. It can be seen that when preparing the adhesive, increasing the ratio of glass fiber to starch in the raw materials results in the compressive performance of the cardboard showing a trend of first increasing and then decreasing.

[0091] Combining Application Example 2 and Application Examples 6-9, the ring crush strength of the cardboard in Application Example 6-8 is higher, and thus the compressive resistance of the cardboard in Application Example 6-8 is better. It can be seen that when preparing the adhesive, the ratio of chopped fiber to ground fiber is preferably 1: (8-12), and the resulting cardboard has better compressive resistance.

[0092] Combining Application Example 7 with Application Examples 10-11, the ring crush strength of the paperboard in Application Example 7 is the highest, and thus the compressive resistance of the paperboard in Application Example 7 is the best. It can be seen that the glass fiber is a mixture of chopped fibers and ground fibers. The chopped fibers are distributed between two sheets of corrugated paper, and the ground fibers are filled between two adjacent chopped fibers to form a structural network, thereby improving the compressive resistance of the obtained paperboard.

[0093] Combining Application Example 7 and Application Example 12, the ring crush strength of the paperboard in Application Example 12 is higher, and thus the compressive performance of the paperboard in Application Example 12 is better. It can be seen that adding sodium hexametaphosphate to the binder raw material and uniformly dispersing the glass fiber of sodium hexametaphosphate in the binder can improve the compressive performance of the obtained paperboard.

[0094] Combining Application Example 12 and Application Example 13, the ring crush strength of the cardboard in Application Example 13 is higher, and thus the compressive performance of the cardboard in Application Example 13 is better. It can be seen that adding sodium isooctanoate to the adhesive raw material can shorten the drying time of the adhesive and increase the stiffness of the corrugated cardboard, thereby further improving the compressive performance of the cardboard.

[0095] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. An adhesive for composite corrugated cardboard, characterized in that: The raw materials of the binder include the following components in parts by weight: 80-120 parts of starch, 1-4 parts of sodium hydroxide, 1-2 parts of borax, 15-25 parts of glass fiber, 250-350 parts of water, 0.01-10.1 parts of sodium hexametaphosphate, and 0.4-0.8 parts of sodium isooctanoate; the glass fiber is a mixture of chopped fibers and milled fibers, the length of the chopped fibers is 2.5-3.5 mm, and the particle size of the milled fibers is 15-25 mesh; the weight ratio of the chopped fibers to the milled fibers is 1:(8-12); the preparation method of the binder includes the following steps: First, take part of the water and part of the starch and stir them evenly, then add sodium hydroxide and stir evenly to obtain a carrier liquid; The remaining water and the remaining starch are stirred and mixed evenly, and then borax is added and stirred evenly to obtain a main liquid; the weight ratio of the starch in the carrier liquid to the starch in the main liquid is 1: (7-8); The carrier liquid is added to the main liquid, and then glass fiber, sodium hexametaphosphate and sodium isooctanoate are added, and the mixture is stirred evenly to obtain a binder.

2. The adhesive for composite corrugated cardboard according to claim 1, characterized in that: The weight ratio of the glass fiber to the starch is 1:(4.5-5.5).

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