CN114311923B - Moisture-proof corrugated board and production process thereof - Google Patents
Moisture-proof corrugated board and production process thereof Download PDFInfo
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- CN114311923B CN114311923B CN202210217659.7A CN202210217659A CN114311923B CN 114311923 B CN114311923 B CN 114311923B CN 202210217659 A CN202210217659 A CN 202210217659A CN 114311923 B CN114311923 B CN 114311923B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
Abstract
The application discloses moisture-proof corrugated board and production process thereof, and belongs to the field of paperboard products. The moistureproof corrugated board comprises a plurality of layers of surface paper and a plurality of layers of corrugated medium paper arranged between adjacent surface paper, wherein the corrugated medium paper is bonded with the surface paper through an adhesive, and the adhesive is prepared from the following raw materials in parts by weight: 50-70 parts of starch, 4-7 parts of alkali, 3-8 parts of an oxidant, 1.2-3.3 parts of a maleic anhydride-styrene sulfonic acid copolymer and 60-100 parts of water. The production process comprises the following steps: stirring starch and water, adding alkali, stirring, standing, removing supernatant, adding an oxidant, stirring, standing, adding a maleic anhydride-styrene sulfonic acid copolymer, and stirring to obtain an adhesive; and coating the adhesive on the multi-layer surface paper, and then sequentially pressing and adhering the surface paper and the corrugated medium paper to obtain the moisture-proof corrugated board. This application has the effect that improves corrugated container board dampproofing ability.
Description
Technical Field
The application relates to the field of paperboard products, in particular to a moisture-proof corrugated paperboard and a production process thereof.
Background
With the rapid development of commodity economy and logistics, the demand of the packaging industry is increasing, and the packaging generally comprises two fields of paper product packaging and plastic packaging, wherein the paper product packaging field is common in corrugated cartons. The corrugated case is composed of a corrugated board, and the corrugated board at least contains a layer of wavy core paper interlayer, so that the corrugated case has high structural strength and good impact resistance.
Various paper interlayers of the corrugated board are generally connected in a bonding mode by using an adhesive, the common corrugated board adhesive is a starch adhesive, the starch adhesive has the advantage of low price, and the starch source is green and environment-friendly and does not pollute the environment, so the starch adhesive is widely favored in the field of corrugated boards.
However, the waterproof performance of the starch adhesive is low, and the corrugated case belongs to paper products, so that the application effect of the corrugated case in a humid environment with high humidity is poor, water vapor easily enters the corrugated board, degumming among the inner layer structures of the corrugated board is caused, the overall structural strength of the corrugated case is further influenced, and the use effect is reduced.
Disclosure of Invention
In order to improve the moisture-proof capacity of corrugated boards, the application provides a moisture-proof corrugated board and a production process thereof.
The application provides a moisture-proof corrugated container board adopts following technical scheme:
the moistureproof corrugated paperboard comprises multiple layers of surface paper and multiple layers of corrugated core paper arranged between the adjacent surface paper, wherein the corrugated core paper is bonded with the surface paper through an adhesive, and the adhesive is prepared from the following raw materials in parts by weight:
50-70 parts of starch;
4-7 parts of alkali;
3-8 parts of an oxidant;
1.2-3.3 parts of maleic anhydride-styrene sulfonic acid copolymer;
60-100 parts of water.
By adopting the technical scheme, the starch is pretreated by alkali, the hydroxyl of the starch is oxidized by the oxidant, so that part of glycosidic bonds of the starch are broken, and active aldehyde groups and carboxyl groups are introduced, so that the fluidity of the starch paste is improved, and the binding power is improved.
The maleic anhydride-styrene sulfonic acid copolymer is used as a modifier, sulfonic groups of the maleic anhydride-styrene sulfonic acid copolymer and residual hydroxyl groups of starch form hydrogen bonds, the viscosity of starch paste is improved, the maleic anhydride-styrene sulfonic acid copolymer and starch molecules form a net-shaped cross-linking structure under the action of the hydrogen bond bridging, the water-blocking and water-resisting capacity of the adhesive is improved, external moisture is not easy to enter the inside of the adhesive under a high-humidity environment, the stability of the adhesive is kept, the stability among all layers of structures of the corrugated board is kept, the structural stability of the corrugated board is improved, and the moisture-proof capacity of the corrugated board is improved.
Optionally, the oxidizing agent is selected from sodium hypochlorite or potassium permanganate.
By adopting the technical scheme, the sodium hypochlorite and the potassium permanganate can oxidize the starch, so that the fluidity and the binding power of the adhesive are improved.
Optionally, the alkali is selected from one or two of sodium hydroxide and potassium hydroxide.
By adopting the technical scheme, sodium hydroxide and potassium hydroxide are used as strong alkali, so that part of protein and grease in the starch can be effectively removed, and the modification effect of the starch is improved.
Optionally, the preparation method of the maleic anhydride-styrene sulfonic acid copolymer comprises the following steps: dissolving maleic anhydride in water to obtain a reaction solution, adjusting the pH of the reaction solution to 4.0-5.0, adding sodium styrene sulfonate, heating to 65-85 ℃, adding an initiator solution while stirring, continuously stirring to obtain a crude product, and performing aftertreatment on the crude product to obtain the maleic anhydride-styrene sulfonic acid copolymer.
By adopting the technical scheme, under the action of the initiator, the maleic anhydride and the sodium styrene sulfonate generate copolymerization reaction to generate the maleic anhydride-styrene sulfonic acid copolymer, and because the pH is adjusted to 4.0-5.0 before the sodium styrene sulfonate is added, the influence of peracid environment on the copolymerization reaction is improved, and the generation effect of the maleic anhydride-styrene sulfonic acid copolymer is improved.
Optionally, the initiator is ammonium persulfate.
Optionally, in the preparation method of the maleic anhydride-styrene sulfonic acid copolymer, the weight ratio of the sodium styrene sulfonate, the maleic anhydride and the water is 1 (0.5-0.9): 5-20, and the weight ratio of the initiator in the initiator solution to the sodium styrene sulfonate is 0.01-0.15): 1.
By adopting the technical scheme, the copolymerization reaction can be better promoted by matching the weight ratio of the raw materials.
Optionally, the raw material of the adhesive further comprises 1-1.5 parts by weight of waterborne polyurethane.
By adopting the technical scheme, the waterborne polyurethane and the maleic anhydride-styrene sulfonic acid copolymer are mixed, so that the connection between the maleic anhydride-styrene sulfonic acid copolymer and the starch molecules is more compact, and the stability of a net-shaped cross-linking structure formed by the maleic anhydride-styrene sulfonic acid copolymer and the starch molecules is improved, thereby improving the binding power of the adhesive and promoting the structure of the corrugated board to be more stable.
Optionally, the viscosity of the waterborne polyurethane is 800-1000 cps, and the solid content is 62-65%.
By adopting the technical scheme, the waterborne polyurethane with low viscosity and high solid content has high flexibility, is easier to mix into a net-shaped cross-linked structure formed by the maleic anhydride-styrene sulfonic acid copolymer and starch molecules, obtains a more compact water-blocking and water-proof network, further reduces the situation that water vapor enters the inside of the adhesive, and improves the moisture-proof capability of the corrugated board.
Optionally, the raw material of the adhesive also comprises 0.4-0.8 part by weight of montmorillonite.
By adopting the technical scheme, the montmorillonite can be doped in a net-shaped cross-linked structure formed by the maleic anhydride-styrene sulfonic acid copolymer and starch molecules, so that the strength of the net-shaped cross-linked structure is improved, and the bursting strength of the corrugated board is improved.
Optionally, the particle size of the montmorillonite is 60-70 μm.
By adopting the technical scheme, the montmorillonite with the particle size is beneficial to being doped in the reticular cross-linked structure.
Optionally, the starch is selected from one or more of corn starch, wheat starch and tapioca starch.
The production process of the moistureproof corrugated board adopts the following technical scheme:
a production process of moisture-proof corrugated boards comprises the following steps:
adding water into starch, uniformly stirring, adding alkali, heating, stirring, standing, cooling, removing supernatant, adding an oxidant, stirring for 10-50 min, standing for 0.5-2 h to obtain a mixed solution, adding a maleic anhydride-styrene sulfonic acid copolymer into the mixed solution, and stirring for 0.5-2 h to obtain an adhesive;
and coating the adhesive on a plurality of layers of surface paper, then pressing and adhering the surface paper and the corrugated medium paper in sequence, standing at room temperature, and drying to obtain the moisture-proof corrugated board.
By adopting the technical scheme, the prepared adhesive has good water resistance, and the adhesive is coated on the surface paper, so that the adhesive not only has an adhesive effect, but also forms a layer of water resistance structure on the surface paper, and the integral moisture resistance of the corrugated board is improved.
Optionally, the coating weight of the adhesive is 25-35 g/m2。
By adopting the technical scheme, the coating amount is beneficial to stable bonding of the corrugated medium paper and the surface paper, and meanwhile, the water resistance of the adhesive is kept.
Optionally, before the mixed solution is added to the maleic anhydride-styrene sulfonic acid copolymer, the waterborne polyurethane and the montmorillonite are mixed and stirred, and then the mixture is added to the mixed solution together.
By adopting the technical scheme, the maleic anhydride-styrene sulfonic acid copolymer, the waterborne polyurethane and the montmorillonite are mixed and stirred, so that the functions of the waterborne polyurethane and the montmorillonite are favorably exerted, and the strength and the moisture-proof capability of the corrugated board are enhanced.
In summary, the present application has the following beneficial effects:
1. according to the method, a mode of combining oxidation treatment and copolymer modification is adopted, the hydroxyl of the starch is oxidized by the oxidant, so that part of glycosidic bonds of the starch are broken, and active aldehyde groups and carboxyl groups are introduced, so that the fluidity of the starch paste is improved, and the binding power is improved; the maleic anhydride-styrene sulfonic acid copolymer is used as a modifier, sulfonic groups of the maleic anhydride-styrene sulfonic acid copolymer and residual hydroxyl groups of starch form hydrogen bonds, the viscosity of starch paste is improved, the maleic anhydride-styrene sulfonic acid copolymer and starch molecules form a net-shaped cross-linking structure under the action of the hydrogen bond bridging, the water-blocking and water-resisting capacity of the adhesive is improved, external moisture is not easy to enter the inside of the adhesive under a high-humidity environment, the stability of the adhesive is kept, the stability among all layers of structures of the corrugated board is kept, the structural stability of the corrugated board is improved, and the moisture-proof capacity of the corrugated board is improved.
2. The water-based polyurethane and the montmorillonite are added to improve the promoting effect of the maleic anhydride-styrene sulfonic acid copolymer, so that the water blocking capability and the structural stability of a net-shaped cross-linked structure formed by the maleic anhydride-styrene sulfonic acid copolymer and starch molecules are further improved, and the structural stability and the moisture resistance of the corrugated board are improved.
Detailed Description
The present application will be described in further detail with reference to examples and comparative examples.
Preparation example
Preparation example 1
Preparation of maleic anhydride-styrene sulfonic acid copolymer:
0.5g of ammonium persulfate and 50g of water are mixed and dissolved to prepare an initiator solution;
taking 50g of sodium styrene sulfonate, 25g of maleic anhydride, 250g of water and 250g of methanol;
dissolving maleic anhydride in water to obtain a reaction solution, dropwise adding a sodium hydroxide aqueous solution into the reaction solution to adjust the pH of the reaction solution to 4.0, then adding sodium styrene sulfonate into the reaction solution, heating to 85 ℃, dropwise adding an initiator solution while stirring, continuously stirring for 2h to obtain a crude product, performing post-treatment on the crude product, wherein the post-treatment specifically comprises the steps of adding methanol into the crude product, precipitating insoluble substances, filtering and collecting the insoluble substances to obtain the maleic anhydride-styrene sulfonic acid copolymer.
Preparation example 2
Preparation of maleic anhydride-styrene sulfonic acid copolymer:
taking 7.5g of ammonium persulfate and 50g of water, mixing and dissolving to prepare an initiator solution;
taking 50g of sodium styrene sulfonate, 45g of maleic anhydride, 1000g of water and 1000g of methanol;
dissolving maleic anhydride in water to obtain a reaction solution, dropwise adding a sodium hydroxide aqueous solution into the reaction solution to adjust the pH of the reaction solution to 5.0, then adding sodium styrene sulfonate into the reaction solution, heating to 65 ℃, dropwise adding an initiator solution while stirring, continuously stirring for 2h to obtain a crude product, performing post-treatment on the crude product, wherein the post-treatment specifically comprises the steps of adding methanol into the crude product, precipitating insoluble substances, filtering and collecting the insoluble substances to obtain the maleic anhydride-styrene sulfonic acid copolymer.
Examples
Example 1
Moisture-proof corrugated cardboard:
the moistureproof corrugated board comprises three layers of surface paper and two layers of corrugated medium paper, wherein the corrugated medium paper is positioned between the adjacent surface paper to form a double-corrugated board structure of surface paper-corrugated medium paper-surface paper, wherein the corrugated medium paper is formed by corrugating raw paper through a corrugated roller, so that the corrugated medium paper has corrugated pits.
The production process of the moisture-proof corrugated board comprises the following steps:
taking 500g of wheat starch, 40g of sodium hydroxide, 30g of sodium hypochlorite, 12g of maleic anhydride-styrene sulfonic acid copolymer prepared in preparation example 1 and 600g of water;
s1, mixing wheat starch and water, stirring uniformly, adding sodium hydroxide, stirring at room temperature for 15min, heating to 60 ℃, continuing to stir for 30min, standing, cooling to room temperature, removing supernatant, adding sodium hypochlorite, stirring at room temperature for 10min, standing for 2h to obtain a mixed solution, adding maleic anhydride-styrene sulfonic acid copolymer into the mixed solution, and stirring at room temperature for 0.5h to obtain the adhesive.
S2, coating the adhesive on surface paper, specifically coating the surface paper on the two side surfaces of the moisture-proof corrugated board on one side, and coating the surface paper in the middle of the moisture-proof corrugated board on two sides, wherein the coating weight is 25g/m2Then pressing and bonding the surface paper and the corrugated medium paper in sequence according to the structure level of the corrugated board, standing for 2h at room temperature, drying for 4h at 100 ℃,and obtaining the moisture-proof corrugated board.
Example 2
The difference between the embodiment and embodiment 1 lies in the different production processes of the moistureproof corrugated board, specifically:
taking 700g of wheat starch, 70g of sodium hydroxide, 80g of sodium hypochlorite, 33g of maleic anhydride-styrene sulfonic acid copolymer prepared in preparation example 2 and 1000g of water;
s1, mixing wheat starch and water, stirring uniformly, adding sodium hydroxide, stirring at room temperature for 15min, heating to 60 ℃, continuing to stir for 30min, standing, cooling to room temperature, removing supernatant, adding sodium hypochlorite, stirring at room temperature for 50min, standing for 0.5h to obtain a mixed solution, adding maleic anhydride-styrene sulfonic acid copolymer into the mixed solution, and stirring at room temperature for 2h to obtain the adhesive.
S2, coating the adhesive on surface paper, specifically coating the surface paper on the two side surfaces of the moisture-proof corrugated board on one side, and coating the surface paper in the middle of the moisture-proof corrugated board on two sides, wherein the coating weight is 35g/m2And then sequentially pressing and bonding the surface paper and the corrugated medium paper according to the structure level of the corrugated board, standing at room temperature for 2 hours, and drying at 100 ℃ for 4 hours to obtain the moisture-proof corrugated board.
Example 3
The difference between the embodiment and embodiment 1 lies in the different production processes of the moistureproof corrugated board, specifically:
taking 620g of wheat starch, 50g of sodium hydroxide, 55g of sodium hypochlorite, 27g of maleic anhydride-styrene sulfonic acid copolymer prepared in preparation example 1 and 800g of water;
s1, mixing wheat starch and water, stirring uniformly, adding sodium hydroxide, stirring at room temperature for 15min, heating to 60 ℃, continuing to stir for 30min, standing, cooling to room temperature, removing supernatant, adding sodium hypochlorite, stirring at room temperature for 30min, standing for 1.5h to obtain a mixed solution, adding maleic anhydride-styrene sulfonic acid copolymer into the mixed solution, and stirring at room temperature for 1.5h to obtain the adhesive.
S2, coating the adhesive on surface paper, specifically, surfaces positioned on two side surfaces of the moisture-proof corrugated boardThe paper is coated on one side, the surface paper positioned in the middle of the moisture-proof corrugated board is coated on two sides, and the coating weight is 25g/m2And then sequentially pressing and bonding the surface paper and the corrugated medium paper according to the structure level of the corrugated board, standing at room temperature for 2 hours, and drying at 100 ℃ for 4 hours to obtain the moisture-proof corrugated board.
Example 4
The difference between this example and example 3 is that in this example, the aqueous polyurethane is added in step S1, the viscosity of the aqueous polyurethane is 1600cps, the solid content of the aqueous polyurethane is 40%, the addition amount of the aqueous polyurethane is 10g, and the specific steps are as follows:
s1, mixing wheat starch and water, stirring uniformly, adding sodium hydroxide, stirring at room temperature for 15min, heating to 60 ℃, continuing to stir for 30min, standing, cooling to room temperature, removing supernatant, adding sodium hypochlorite, stirring at room temperature for 30min, and standing for 1.5h to obtain a mixed solution; and mixing and stirring the maleic anhydride-styrene sulfonic acid copolymer and the waterborne polyurethane for 10min, then adding the mixture into the mixed solution, and stirring the mixture for 1.5h at room temperature to obtain the adhesive.
Example 5
The difference between this example and example 3 is that in this example, in step S1, the aqueous polyurethane is further added, the viscosity of the aqueous polyurethane is 1600cps, the solid content of the aqueous polyurethane is 40%, the addition amount of the aqueous polyurethane is 15g, and the specific steps are as follows:
s1, mixing wheat starch and water, stirring uniformly, adding sodium hydroxide, stirring at room temperature for 15min, heating to 60 ℃, continuing to stir for 30min, standing, cooling to room temperature, removing supernatant, adding sodium hypochlorite, stirring at room temperature for 30min, and standing for 1.5h to obtain a mixed solution; and mixing and stirring the maleic anhydride-styrene sulfonic acid copolymer and the waterborne polyurethane for 10min, then adding the mixture into the mixed solution, and stirring the mixture for 1.5h at room temperature to obtain the adhesive.
Example 6
The difference between this example and example 5 is that the viscosity of the aqueous polyurethane of this example is 800cps, and the solid content of the aqueous polyurethane is 62%.
Example 7
The difference between this example and example 5 is that the viscosity of the waterborne polyurethane of this example is 1000cps, and the solid content of the waterborne polyurethane is 65%.
Example 8
The difference between this embodiment and embodiment 7 is that in this embodiment, montmorillonite is further added in step S1, the particle size of montmorillonite is 60 to 70 μm, the addition amount of montmorillonite is 4g, and the specific steps are as follows:
s1, mixing wheat starch and water, stirring uniformly, adding sodium hydroxide, stirring at room temperature for 15min, heating to 60 ℃, continuing to stir for 30min, standing, cooling to room temperature, removing supernatant, adding sodium hypochlorite, stirring at room temperature for 30min, and standing for 1.5h to obtain a mixed solution; mixing and stirring maleic anhydride-styrene sulfonic acid copolymer, waterborne polyurethane and montmorillonite for 20min, then adding into the mixed solution, and stirring for 1.5h at room temperature to obtain the adhesive.
Example 9
The difference between this embodiment and embodiment 7 is that in this embodiment, montmorillonite is further added in step S1, the particle size of montmorillonite is 60 to 70 μm, the addition amount of montmorillonite is 8g, and the specific steps are as follows:
s1, mixing wheat starch and water, stirring uniformly, adding sodium hydroxide, stirring at room temperature for 15min, heating to 60 ℃, continuing to stir for 30min, standing, cooling to room temperature, removing supernatant, adding sodium hypochlorite, stirring at room temperature for 30min, and standing for 1.5h to obtain a mixed solution; mixing and stirring maleic anhydride-styrene sulfonic acid copolymer, waterborne polyurethane and montmorillonite for 20min, then adding into the mixed solution, and stirring for 1.5h at room temperature to obtain the adhesive.
Comparative example
Comparative example 1
This comparative example is different from example 3 in that maleic anhydride-styrene sulfonic acid copolymer was not added in the step of S1.
Comparative example 2
This comparative example is different from example 3 in that it replaces the maleic anhydride-styrene sulfonic acid copolymer with an equal amount of polystyrene sulfonic acid in the step of S1.
Comparative example 3
The comparative example is different from example 3 in that the same amount of aqueous polyurethane is used instead of the maleic anhydride-styrenesulfonic acid copolymer in step S1, the viscosity of the aqueous polyurethane is 1600cps, and the solid content of the aqueous polyurethane is 40%.
Performance test
The following performance tests were performed on the various examples and comparative examples of the present application:
the bonding strength between the corrugated medium paper and the surface paper is as follows: the test is carried out according to GB/T6548 plus 2011 < determination of adhesive strength of corrugated boards >, the corrugated boards are placed in a constant-temperature and constant-humidity test box for 12 hours before the test, the test environments of the constant-temperature and constant-humidity test box are divided into two types, the temperature of the two types of test environments is 35 ℃, the difference is that one type is humidity 40% RH, the other type is humidity 80% RH, and the test results are shown in Table 1.
Burst strength of corrugated cardboard: the test was carried out according to GB/T6545-1998 method for determining the bursting strength of corrugated cardboards, and the test results are shown in Table 1.
TABLE 1
| Adhesive Strength at humidity 40% RH (kN/m) | Adhesive Strength (kN/m) at humidity 80% RH | Burst Strength (kPa) | |
| Example 1 | 2.03 | 1.73 | 1976 |
| Example 2 | 1.97 | 1.70 | 1998 |
| Example 3 | 2.01 | 1.74 | 1994 |
| Example 4 | 2.09 | 1.83 | 2001 |
| Example 5 | 2.11 | 1.85 | 2006 |
| Example 6 | 2.13 | 1.93 | 2011 |
| Example 7 | 2.12 | 1.93 | 2009 |
| Example 8 | 2.15 | 1.96 | 2025 |
| Example 9 | 2.17 | 1.98 | 2031 |
| Comparative example 1 | 1.87 | 1.35 | 1920 |
| Comparative example 2 | 1.65 | 1.21 | 1904 |
| Comparative example 3 | 1.93 | 1.64 | 1913 |
According to the results of table 1, the adhesive strength and bursting strength of the corrugated cardboard are improved by adding the maleic anhydride-styrenesulfonic acid copolymer in the comparative example of example 3 to comparative example 1, and particularly, the adhesive strength of the corrugated cardboard can be maintained at a high level after being subjected to a high humidity (80% RH) environment, because the maleic anhydride-styrenesulfonic acid copolymer and starch molecules form a network cross-linked structure to improve the water blocking capability of the cured adhesive, thereby improving the moisture resistance of the corrugated cardboard and improving the structural stability of the corrugated cardboard.
Taking the comparison of example 3 and comparative example 2 as an example, the addition of polystyrene sulfonic acid without the maleic anhydride-styrene sulfonic acid copolymer not only did not improve the adhesive strength and the bursting strength of the corrugated cardboard, but also reduced the adhesive strength of the corrugated cardboard, which indicates that the maleic anhydride-styrene sulfonic acid copolymer has a better effect.
In comparison between examples 4-5 and 3, the adhesive strength and burst strength of the corrugated board were improved by adding the aqueous polyurethane, because the aqueous polyurethane and the maleic anhydride-styrene sulfonic acid copolymer were mixed to promote the stability of the network cross-linking structure formed by the maleic anhydride-styrene sulfonic acid copolymer and the starch molecules.
Compared with the embodiment 5, the embodiment 6-7 adopts the waterborne polyurethane with the viscosity of 800-1000 cps and the solid content of 62-65%, and the bonding strength of the corrugated board can still be maintained at a higher level after the corrugated board is subjected to a high humidity environment, because the low-viscosity and high-solid content waterborne polyurethane can enable the mesh cross-linking structure to be more compact, so that the water blocking and water resisting capability of the adhesive is further improved.
In comparison with the comparative example 3, the adhesive strength and the burst strength of the corrugated board are not improved much by adding the aqueous polyurethane alone without adding the maleic anhydride-styrene sulfonic acid copolymer, which indicates that the aqueous polyurethane functions in cooperation with the maleic anhydride-styrene sulfonic acid copolymer.
Compared with the embodiment 7, the embodiment 8-9 has the advantage that the added montmorillonite improves the burst strength of the corrugated board, and the reason is that the montmorillonite improves the strength of a net-shaped cross-linking structure formed by the maleic anhydride-styrene sulfonic acid copolymer and starch molecules, so that the strength of the cured adhesive is improved, and the burst strength of the corrugated board is improved.
Claims (8)
1. A moisture-proof corrugated board is characterized in that: the corrugated medium paper is adhered to the surface paper through an adhesive, and the adhesive is prepared from the following raw materials in parts by weight:
50-70 parts of starch;
4-7 parts of alkali;
3-8 parts of an oxidant;
1.2-3.3 parts of maleic anhydride-styrene sulfonic acid copolymer;
60-100 parts of water;
1-1.5 parts of waterborne polyurethane;
the viscosity of the waterborne polyurethane is 800-1000 cps, and the solid content is 62-65%.
2. The moisture-proof corrugated cardboard of claim 1, wherein: the oxidant is selected from sodium hypochlorite or potassium permanganate.
3. The moisture-proof corrugated cardboard of claim 1, wherein: the preparation method of the maleic anhydride-styrene sulfonic acid copolymer comprises the following steps: dissolving maleic anhydride in water to obtain a reaction solution, adjusting the pH of the reaction solution to 4.0-5.0, adding sodium styrene sulfonate, heating to 65-85 ℃, adding an initiator solution while stirring, continuously stirring to obtain a crude product, and performing aftertreatment on the crude product to obtain the maleic anhydride-styrene sulfonic acid copolymer.
4. A moisture-proof corrugated cardboard as claimed in claim 3 wherein: in the preparation method of the maleic anhydride-styrene sulfonic acid copolymer, the weight ratio of sodium styrene sulfonate, maleic anhydride and water is 1 (0.5-0.9): 5-20, and the weight ratio of the initiator in the initiator solution to the sodium styrene sulfonate is 0.01-0.15): 1.
5. The moisture-proof corrugated cardboard of any one of claims 1 to 4, wherein: the raw material of the adhesive also comprises 0.4-0.8 part of montmorillonite by weight.
6. A production process of moisture-proof corrugated boards is characterized by comprising the following steps: a method for producing a moisture-proof corrugated board as claimed in any one of claims 1 to 5, comprising the steps of:
adding water into starch, uniformly stirring, adding alkali, heating, stirring, standing, cooling, removing supernatant, adding an oxidant, stirring for 10-50 min, standing for 0.5-2 h to obtain a mixed solution, adding a maleic anhydride-styrene sulfonic acid copolymer into the mixed solution, and stirring for 0.5-2 h to obtain an adhesive;
and coating the adhesive on a plurality of layers of surface paper, then pressing and adhering the surface paper and the corrugated medium paper in sequence, standing at room temperature, and drying to obtain the moisture-proof corrugated board.
7. The process for producing moisture-proof corrugated cardboard as claimed in claim 6, wherein: the coating weight of the adhesive is 25-35 g/m2。
8. The process for producing moisture-proof corrugated cardboard as claimed in claim 6, wherein: before the mixed solution is added with the maleic anhydride-styrene sulfonic acid copolymer, the waterborne polyurethane and the montmorillonite are mixed and stirred, and then are added into the mixed solution together.
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