A type of corrugated paper containing flame-retardant adhesive and its manufacturing process

Abstract

This invention relates to the field of corrugated paper technology and discloses a corrugated paper containing a flame-retardant adhesive and its production process. The process involves a ring-opening reaction between the bi-terminal epoxy groups of a bi-terminal epoxypropyl polysiloxane and the hydroxymethyl groups of starch, resulting in cross-linking of the starch. The starch then reacts with the isocyanate groups of a toluene-2-isocyanate-4-(trioxa-phosphabicyclic) intermediate to obtain a phosphorus-containing organosilicon cross-linked starch. Finally, this starch is compounded with gelatin, polyvinyl alcohol, and potassium aluminum sulfate to obtain a phosphorus-containing organosilicon cross-linked starch sizing agent. The organosilicon cross-linked starch sizing agent is then compounded with epoxy resin to obtain a flame-retardant adhesive, which is used to coat the corrugated paper. The starch sizing agent contains a hydrophobic organosilicon structure, which can improve the surface hydrophobicity and water resistance of the corrugated paper, enhance its edge crush strength and folding endurance. Simultaneously, the phosphorus-containing flame retardant in the starch sizing agent and the organosilicon form a phosphorus-silicon synergistic flame-retardant system, improving the flame-retardant performance of the corrugated paper.

Description

Technical Field

[0001] This invention relates to the field of corrugated paper technology, specifically to a type of corrugated paper containing flame-retardant adhesive and its production process. Background Technology

[0002] Corrugated paper is a sheet material made by bonding linerboard and corrugated paper. It has advantages such as low cost, light weight, and high strength, and is widely used in packaging for food, precision instruments, and electronic products. Traditional corrugated paper has disadvantages such as poor water resistance and flame retardancy. Treating corrugated paper with adhesives can improve its overall performance. For example, patent CN108424723B, "An Adhesive for Corrugated Cardboard Boxes," discloses the use of modified epoxy resin and modified starch, which improves the adhesive's high-temperature resistance and bonding performance. The resulting cardboard has high compressive strength and strong puncture resistance, thus improving the overall performance and quality of the corrugated cardboard box.

[0003] Treating corrugated paper with flame-retardant coatings or adhesives can improve its flame-retardant properties. Patent CN107034739B, "A Flame-Retardant and Wear-Resistant Corrugated Cardboard Box," discloses a method where the face paper, corrugated paper, and inner paper are bonded together with oxidized starch containing a vapor-phase corrosion inhibitor. Furthermore, a fire-retardant and wear-resistant coating containing cashew nut shell oil or melamine-modified phenolic resin is applied to the surfaces of the face paper and inner paper. The resulting corrugated cardboard box exhibits strong wear resistance, mechanical properties, and flame-retardant properties. This invention provides corrugated paper containing a flame-retardant adhesive and its production process, improving the water resistance, flame retardancy, and folding resistance of traditional corrugated paper. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] This invention provides a corrugated paper containing flame-retardant adhesive and its production process, which solves the problems of poor water resistance, poor flame retardancy, and low folding endurance of traditional corrugated paper.

[0006] (II) Technical Solution

[0007] A process for producing corrugated paper with flame-retardant adhesive includes the following steps:

[0008] S1. Phosphorus-containing organosilicon crosslinked starch sizing agent, epoxy resin, and acetone are sheared and dispersed in a high shear machine, and then a curing agent is added and dispersed evenly to obtain a flame-retardant adhesive.

[0009] S2. Using a coating machine, the flame-retardant adhesive is evenly coated onto the surface of the corrugated paperboard base paper using a coating roller to form a coating film, and then heat-cured to obtain corrugated paperboard containing flame-retardant adhesive.

[0010] Furthermore, the amount of phosphorus-containing organosilicon crosslinked starch sizing agent in S1 is 30-80% of that in epoxy resin.

[0011] Furthermore, the preparation method of the phosphorus-containing organosilicon crosslinked starch sizing agent in S1 is as follows:

[0012] (1) A hydrosilylation reaction was carried out between the hydrogen-containing polysiloxane and allyl glycidyl ether to obtain a hydrogen-containing polysiloxane. Then, starch was added to dimethyl sulfoxide and heated to 80-100℃ and stirred for 1-2 h. Then, hydrogen-containing polysiloxane was added and stirred for 6-12 h. After the reaction, the mixture was cooled and ethanol was added for precipitation. The solvent was filtered and the mixture was washed with deionized water to obtain hydroxyl polysiloxane cross-linked starch.

[0013] (2) Add hydroxyl polysiloxane cross-linked starch to dimethyl sulfoxide, stir evenly, then add toluene-2-isocyanate-4-(trioxa-phosphabicyclo) intermediate and catalyst dibutyltin dilaurate, and react in a nitrogen atmosphere at 70-85℃ for 4-10h. After the reaction, cool, add ethanol for precipitation, filter the solvent, and wash with deionized water and ethanol in sequence to obtain phosphorus-containing organosilicon cross-linked starch.

[0014] (3) Add 1.5-5% gelatin, 1-4% polyvinyl alcohol, 0.5-1% potassium aluminum sulfate and 90-97% phosphorus-containing organosilicon cross-linked starch by weight to deionized water and stir evenly to obtain phosphorus-containing organosilicon cross-linked starch sizing agent.

[0015] Furthermore, in (1), starch includes one or any combination of corn starch, potato starch, cassava starch, sweet potato starch or wheat starch.

[0016] Furthermore, in (1), the amount of double-ended epoxy propylene polysiloxane used is 12-30% of the starch mass.

[0017] Furthermore, in (2), the amount of toluene-2-isocyanate-4-(trioxa-phosphabicyclo) intermediate is 15-40% of the mass of hydroxyl polysiloxane crosslinked starch.

[0018] Furthermore, the production process of the toluene-2-isocyanate-4-(trioxa-phosphabicyclo) intermediate in (2) is as follows: toluene-2,4-diisocyanate and 1-oxo-4-hydroxymethyl-2,6,7-trioxa-1-phosphabicyclo[2.2.2]octane in a molar ratio of 1.1-1.5:1 are dissolved in tetrahydrofuran and reacted at 35-45°C for 4-8 hours under a nitrogen atmosphere. After the reaction, the mixture is concentrated under reduced pressure and washed with n-hexane to obtain the toluene-2-isocyanate-4-(trioxa-phosphabicyclo) intermediate.

[0019] Furthermore, the thickness of the coating in S2 is 0.3-0.8 mm.

[0020] Furthermore, the temperature for heat curing in S2 is 70-100℃, and the time is 2-5 hours.

[0021] (III) Beneficial Technical Effects

[0022] 1. By utilizing the different reactivity of the two isocyanate groups of toluene-2,4-diisocyanate and controlling the reaction ratio with 1-oxo-4-hydroxymethyl-2,6,7-trioxa-1-phosphabicyclo[2.2.2]octane, the active isocyanate group at the 4 position is reacted to obtain the toluene-2-isocyanate-4-(trioxa-phosphabicyclo) intermediate.

[0023] 2. The cross-linking of starch is achieved by utilizing the ring-opening reaction between the two-terminal epoxy groups of the di-terminal epoxy-propylene polysiloxane and the hydroxymethyl groups of starch. Simultaneously, the ring-opening reaction of the epoxy groups generates secondary hydroxyl groups, resulting in hydroxyl polysiloxane cross-linked starch. The generated secondary hydroxyl groups then react with the isocyanate groups of the toluene-2-isocyanate-4-(trioxa-phosphabicyclo) intermediate under the catalysis of dibutyltin dilaurate to obtain phosphorus-containing organosilicon cross-linked starch. Finally, it is compounded with gelatin, polyvinyl alcohol, and potassium aluminum sulfate to obtain a phosphorus-containing organosilicon cross-linked starch sizing agent. The cross-linked starch sizing agent forms a three-dimensional network skeleton with an organosilicon structure, exhibiting better water resistance and strength.

[0024] 3. A flame-retardant adhesive is prepared by compounding an organosilicon crosslinked starch sizing agent and epoxy resin, and then coated onto corrugated paper. The starch sizing agent contains a hydrophobic organosilicon structure, which can improve the surface hydrophobicity and water resistance of the corrugated paper, and enhance the edge crush strength and folding resistance of the corrugated paper. At the same time, the phosphorus-containing flame retardant in the starch sizing agent and the organosilicon form a phosphorus-silicon synergistic flame retardant system, which further improves the flame retardant performance of the corrugated paper. Detailed Implementation

[0025] The production process of double-terminated epoxypropyl polysiloxane is as follows: 100g of double-terminated hydrogen-containing polysiloxane, 3.4g of allyl glycidyl ether, and 0.28g of isopropanol of chloroplatinic acid are mixed evenly, and the mixture is heated to 85℃ under a nitrogen atmosphere and reacted for 6h. Small molecule substances are removed by vacuum distillation to obtain double-terminated epoxypropyl polysiloxane.

[0026] Example 1

[0027] (1) Add 20g of corn starch to dimethyl sulfoxide, heat to 90℃ and stir for 1h, then add 3.5g of double-terminated epoxypropyl polysiloxane, stir and react for 12h, cool after reaction, add ethanol to precipitate, filter solvent, wash with deionized water to obtain hydroxyl polysiloxane cross-linked starch.

[0028] (2) Toluene-2,4-diisocyanate (0.3 mol) and 1-oxo-4-hydroxymethyl-2,6,7-trioxa-1-phosphabicyclo[2.2.2]octane (0.2 mol) were dissolved in tetrahydrofuran and reacted at 45 °C for 6 h under a nitrogen atmosphere. After the reaction, the mixture was concentrated under reduced pressure and washed with n-hexane to obtain toluene-2-isocyanate-4-(trioxa-phosphabicyclo) intermediate; the reaction formula is as follows:

[0029]

[0030] (3) Add 50g of hydroxyl polysiloxane cross-linked starch to dimethyl sulfoxide, stir evenly, then add 15g of toluene-2-isocyanate-4-(trioxa-phosphabicyclo) intermediate and 0.1g of catalyst dibutyltin dilaurate. In a nitrogen atmosphere, heat to 70℃ and react for 8h. After the reaction, cool, add ethanol to precipitate, filter the solvent, and wash with deionized water and ethanol in sequence to obtain phosphorus-containing organosilicon cross-linked starch.

[0031] (4) Add 0.3g of gelatin, 0.6g of polyvinyl alcohol, 0.1g of potassium aluminum sulfate and 19g of phosphorus-containing organosilicon cross-linked starch to deionized water and stir evenly to obtain phosphorus-containing organosilicon cross-linked starch sizing agent.

[0032] (5) 15g of phosphorus-containing organosilicon crosslinked starch sizing agent, 50g of epoxy resin and acetone are sheared and dispersed in a high shear machine, and then 22g of polyamide curing agent is added and dispersed evenly to obtain flame retardant adhesive.

[0033] (6) Using a coating machine, the flame-retardant adhesive is evenly coated onto the surface of the corrugated paperboard base paper to form a coating film. The thickness of the coating film is controlled to be 0.8 mm. Then, heat curing is performed at a temperature of 80°C for 2 hours to obtain corrugated paperboard containing flame-retardant adhesive.

[0034] Example 2

[0035] (1) Add 20g of corn starch to dimethyl sulfoxide, heat to 80℃ and stir for 2h, then add 4.2g of double-terminated epoxypropyl polysiloxane, stir and react for 10h, cool after reaction, add ethanol to precipitate, filter solvent, wash with deionized water to obtain hydroxyl polysiloxane cross-linked starch.

[0036] (2) Toluene-2,4-diisocyanate and 1-oxo-4-hydroxymethyl-2,6,7-trioxa-1-phosphabicyclo[2.2.2]octane in a molar ratio of 0.25 mol were dissolved in tetrahydrofuran and reacted at 35 °C for 8 h under a nitrogen atmosphere. After the reaction, the mixture was concentrated under reduced pressure and washed with n-hexane to obtain toluene-2-isocyanate-4-(trioxa-phosphabicyclo) intermediate.

[0037] (3) Add 50g of hydroxyl polysiloxane cross-linked starch to dimethyl sulfoxide, stir evenly, then add 12g of toluene-2-isocyanate-4-(trioxa-phosphabicyclo) intermediate and 0.1g of catalyst dibutyltin dilaurate. In a nitrogen atmosphere, heat to 85℃ and react for 10h. After the reaction, cool, add ethanol to precipitate, filter the solvent, and wash with deionized water and ethanol in sequence to obtain phosphorus-containing organosilicon cross-linked starch.

[0038] (4) Add 1g of gelatin, 0.2g of polyvinyl alcohol, 0.2g of potassium aluminum sulfate and 18.6g of phosphorus-containing organosilicon cross-linked starch to deionized water and stir evenly to obtain phosphorus-containing organosilicon cross-linked starch sizing agent.

[0039] (5) 30g of phosphorus-containing organosilicon crosslinked starch sizing agent, 50g of epoxy resin and acetone are sheared and dispersed in a high shear machine, and then 22g of polyamide curing agent is added and dispersed evenly to obtain flame retardant adhesive.

[0040] (6) Using a coating machine, the flame-retardant adhesive is evenly coated onto the surface of the corrugated paperboard base paper to form a coating film. The thickness of the coating film is controlled to be 0.3 mm. Then, heat curing is performed at a temperature of 70°C for 5 hours to obtain corrugated paperboard containing flame-retardant adhesive.

[0041] Example 3

[0042] (1) Add 20g of corn starch to dimethyl sulfoxide, heat to 100℃ and stir for 1h, then add 2.4g of double-terminated epoxypropyl polysiloxane, stir and react for 12h, cool after reaction, add ethanol to precipitate, filter solvent, wash with deionized water to obtain hydroxyl polysiloxane cross-linked starch.

[0043] (2) Toluene-2,4-diisocyanate (0.22 mol) and 1-oxo-4-hydroxymethyl-2,6,7-trioxa-1-phosphabicyclo[2.2.2]octane (0.22 mol) were dissolved in tetrahydrofuran and reacted at 45 °C for 4 h under a nitrogen atmosphere. After the reaction, the mixture was concentrated under reduced pressure and washed with n-hexane to obtain toluene-2-isocyanate-4-(trioxa-phosphabicyclo) intermediate.

[0044] (3) Add 50g of hydroxyl polysiloxane cross-linked starch to dimethyl sulfoxide, stir evenly, then add 20g of toluene-2-isocyanate-4-(trioxa-phosphabicyclo) intermediate and 0.15g of catalyst dibutyltin dilaurate. In a nitrogen atmosphere, heat to 75℃ and react for 10h. After the reaction, cool, add ethanol to precipitate, filter the solvent, and wash with deionized water and ethanol in sequence to obtain phosphorus-containing organosilicon cross-linked starch.

[0045] (4) Add 0.6g gelatin, 0.4g polyvinyl alcohol, 0.2g potassium aluminum sulfate and 18.8g phosphorus-containing organosilicon cross-linked starch to deionized water and stir evenly to obtain phosphorus-containing organosilicon cross-linked starch sizing agent.

[0046] (5) 32g of phosphorus-containing organosilicon crosslinked starch sizing agent, 50g of epoxy resin and acetone are sheared and dispersed in a high shear machine, and then 22g of polyamide curing agent is added and dispersed evenly to obtain flame retardant adhesive.

[0047] (6) Using a coating machine, the flame-retardant adhesive is evenly coated onto the surface of the corrugated paperboard base paper to form a coating film. The thickness of the coating film is controlled to be 0.8 mm. Then, heat curing is performed at a temperature of 100°C for 2 hours to obtain corrugated paperboard containing flame-retardant adhesive.

[0048] Example 4

[0049] (1) Add 20g of corn starch to dimethyl sulfoxide, heat to 90℃ and stir for 2h, then add 6g of double-terminated epoxypropyl polysiloxane, stir for 6h, cool after reaction, add ethanol for precipitation, filter solvent, wash with deionized water to obtain hydroxyl polysiloxane cross-linked starch.

[0050] (2) Toluene-2,4-diisocyanate and 1-oxo-4-hydroxymethyl-2,6,7-trioxa-1-phosphabicyclo[2.2.2]octane in a molar ratio of 0.28 mol were dissolved in tetrahydrofuran and reacted at 40 °C for 6 h under a nitrogen atmosphere. After the reaction, the mixture was concentrated under reduced pressure and washed with n-hexane to obtain toluene-2-isocyanate-4-(trioxa-phosphabicyclo) intermediate.

[0051] (3) Add 50g of hydroxyl polysiloxane cross-linked starch to dimethyl sulfoxide, stir evenly, then add 7.5g of toluene-2-isocyanate-4-(trioxa-phosphabicyclo) intermediate and 0.05g of catalyst dibutyltin dilaurate. In a nitrogen atmosphere, heat to 85℃ and react for 8h. After the reaction, cool, add ethanol to precipitate, filter the solvent, and wash with deionized water and ethanol in sequence to obtain phosphorus-containing organosilicon cross-linked starch.

[0052] (4) Add 0.8g gelatin, 0.7g polyvinyl alcohol, 0.1g potassium aluminum sulfate and 18.4g phosphorus-containing organosilicon cross-linked starch to deionized water and stir evenly to obtain phosphorus-containing organosilicon cross-linked starch sizing agent.

[0053] (5) 40g of phosphorus-containing organosilicon crosslinked starch sizing agent, 50g of epoxy resin and acetone are sheared and dispersed in a high shear machine, and then 22g of polyamide curing agent is added and dispersed evenly to obtain flame retardant adhesive.

[0054] (6) Using a coating machine, the flame-retardant adhesive is evenly coated onto the surface of the corrugated paperboard base paper to form a coating film. The thickness of the coating film is controlled to be 0.5 mm. Then, heat curing is performed at a temperature of 70°C for 5 hours to obtain corrugated paperboard containing flame-retardant adhesive.

[0055] Comparative Example 1

[0056] (1) Add 20g of corn starch to dimethyl sulfoxide, heat to 90℃ and stir for 2h, then add 4g of double-terminated epoxypropyl polysiloxane, stir and react for 12h, cool after reaction, add ethanol to precipitate, filter solvent, wash with deionized water to obtain hydroxyl polysiloxane cross-linked starch.

[0057] (2) Add 0.3g gelatin, 0.8g polyvinyl alcohol, 0.1g potassium aluminum sulfate and 18.8g hydroxyl polysiloxane cross-linked starch to deionized water and stir evenly to obtain organosilicon cross-linked starch sizing agent.

[0058] (3) 30g of organosilicon cross-linked starch sizing agent, 50g of epoxy resin and acetone are sheared and dispersed in a high shear machine, and then 22g of polyamide curing agent is added and dispersed evenly to obtain flame retardant adhesive.

[0059] (4) Using a coating machine, the flame-retardant adhesive is evenly coated onto the surface of the corrugated paperboard base paper to form a coating film. The thickness of the coating film is controlled to be 0.5 mm. Then, heat curing is carried out at a temperature of 80°C for 4 hours to obtain corrugated paperboard containing adhesive.

[0060] Comparative Example 2

[0061] (1) Add 0.6g gelatin, 0.44g polyvinyl alcohol, 0.16g potassium aluminum sulfate and 18.8g phosphorus-containing organosilicon crosslinked starch to deionized water and stir evenly to obtain starch sizing agent.

[0062] (2) Disperse 20g of starch sizing agent, 50g of epoxy resin and acetone in a high shear machine, and then add 22g of polyamide curing agent and disperse evenly to obtain adhesive.

[0063] (3) Using a coating machine, the adhesive is evenly coated onto the surface of the corrugated paperboard base paper and a coating film is formed by coating rollers. The thickness of the coating film is controlled to be 0.8 mm. Then, heat curing is carried out at a temperature of 80°C for 4 hours to obtain corrugated paper containing adhesive.

[0064] Water resistance test: The water contact angle of the corrugated paper surface was measured using a water contact angle tester, and the test method was in accordance with GB / T 30693-2014. The corrugated paper was immersed in water, and the time for the adhesive to de-adhese from the surface of the corrugated paper was observed.

[0065] The edge crush strength of corrugated paper is determined by an edge crush sampling machine, and the test method refers to GB / T450-2002.

[0066] The folding endurance of corrugated paper was determined using a paper folding endurance tester, and the test method was in accordance with GB / T457-2008.

[0067] The flame retardant properties of corrugated paper were determined using an oxygen index tester. The test method was as follows: A straight line was marked on the surface of the corrugated paper sample, 50 mm from the ignition source of the oxygen index tester. The sample was placed vertically in the sample holder. The flow rate of the nitrogen and oxygen mixture in the combustion chamber of the oxygen index tester was adjusted to 50 mm / s. Once the top of the sample was completely ignited, timing was started and the combustion phenomenon of the corrugated paper was observed. The oxygen concentration was gradually increased from both the top and bottom sides to approach the minimum oxygen concentration required to sustain combustion. The test was stopped when the concentration difference between the top and bottom sides was less than 0.5%. The average value of the test results is the oxygen index value of the material.

[0068]

[0069] In Examples 1-4, flame-retardant adhesives prepared by combining phosphorus-containing organosilicon crosslinked starch sizing agents and epoxy resins were used to coat the surface of corrugated paper. After the starch was crosslinked by hydrophobic organosilicon, it had better hydrophobicity and water resistance. The water contact angle of the corrugated paper reached 91.4-109.8°, the degumming time in water reached up to 19 hours, and the edge crush strength and folding endurance were high, which were far superior to the adhesive prepared by combining starch sizing agents and epoxy resins alone in Comparative Example 2.

[0070] In Examples 1-4, the phosphorus-containing organosilicon crosslinked starch in the flame-retardant adhesive has a phosphorus-containing flame retardant and an organosilicon structure. The two form a phosphorus-silicon synergistic flame-retardant effect, exhibiting excellent flame-retardant performance. The limiting oxygen index of the corrugated paper is as high as 28.5%, indicating excellent flame-retardant performance. In contrast, the starch sizing agent in Comparative Example 1 does not have a phosphorus-containing flame retardant structure. The starch sizing agent in Comparative Example 1 does not have a phosphorus-containing flame retardant and organosilicon structure, resulting in a lower limiting oxygen index and poorer flame-retardant performance for the corrugated paper.

Claims

1. A production process for corrugated paper containing flame-retardant adhesive, characterized in that: The production process includes the following steps: S1. Phosphorus-containing organosilicon cross-linked starch sizing agent, epoxy resin and acetone are sheared and dispersed in a high shear machine, and then a curing agent is added and dispersed evenly to obtain a flame-retardant adhesive. S2. Using a coating machine, the flame-retardant adhesive is evenly coated onto the surface of the corrugated paperboard base paper using a coating roller to form a coating film, and then heat-cured to obtain corrugated paperboard containing flame-retardant adhesive. The preparation method of the phosphorus-containing organosilicon crosslinked starch sizing agent in S1 is as follows: (1) Hydrosilylation reaction of hydrogen-containing polysiloxane and allyl glycidyl ether was carried out to obtain hydrogen-containing polysiloxane; then starch was added to dimethyl sulfoxide, heated to 80-100℃ and stirred for 1-2 h, then hydrogen-containing polysiloxane was added and stirred for 6-12 h. After the reaction was cooled, ethanol was added to precipitate the product, the solvent was filtered, and the product was washed with deionized water to obtain hydroxyl polysiloxane cross-linked starch. (2) Add hydroxyl polysiloxane cross-linked starch to dimethyl sulfoxide, stir evenly, then add toluene-2-isocyanate-4-(trioxa-phosphabicyclo) intermediate and catalyst dibutyltin dilaurate, and react in a nitrogen atmosphere at 70-85℃ for 4-10h. After the reaction, cool, add ethanol for precipitation, filter the solvent, and wash with deionized water and ethanol in sequence to obtain phosphorus-containing organosilicon cross-linked starch. (3) Add 1.5-5% gelatin, 1-4% polyvinyl alcohol, 0.5-1% potassium aluminum sulfate and 90-97% phosphorus-containing organosilicon cross-linked starch by weight to deionized water and stir evenly to obtain phosphorus-containing organosilicon cross-linked starch sizing agent. The production process of the toluene-2-isocyanate-4-(trioxa-phosphabicyclo) intermediate in (2) is as follows: toluene-2,4-diisocyanate and 1-oxo-4-hydroxymethyl-2,6,7-trioxa-1-phosphabicyclo[2.2.2]octane in a molar ratio of 1.1-1.5:1 are dissolved in tetrahydrofuran and reacted at 35-45°C for 4-8 hours under a nitrogen atmosphere. After the reaction, the mixture is concentrated under reduced pressure and washed with n-hexane to obtain the toluene-2-isocyanate-4-(trioxa-phosphabicyclo) intermediate.

2. The production process of corrugated paper containing flame-retardant adhesive according to claim 1, characterized in that: The amount of phosphorus-containing organosilicon crosslinked starch sizing agent in S1 is 30-80% of that in epoxy resin.

3. The production process of corrugated paper containing flame-retardant adhesive according to claim 1, characterized in that: (1) Starch includes one or any combination of corn starch, potato starch, cassava starch, sweet potato starch or wheat starch.

4. The production process of corrugated paper containing flame-retardant adhesive according to claim 1, characterized in that: (1) The amount of double-ended epoxy propylene polysiloxane used is 12-30% of the starch mass.

5. The production process of corrugated paper containing flame-retardant adhesive according to claim 1, characterized in that: (2) The amount of toluene-2-isocyanate-4-(trioxa-phosphabicyclo) intermediate used is 15-40% of the mass of hydroxyl polysiloxane cross-linked starch.

6. The production process of corrugated paper containing flame-retardant adhesive according to claim 1, characterized in that: The thickness of the coating in S2 is 0.3-0.8 mm.

7. The production process of corrugated paper containing flame-retardant adhesive according to claim 1, characterized in that: The temperature for heat curing in S2 is 70-100℃, and the time is 2-5 hours.

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