Flame-retardant pressure-resistant transport carton and manufacturing process thereof

Abstract

The invention discloses a flame-retardant, pressure-resistant transport carton and a manufacturing process thereof, which relate to the technical field of carton. The scheme uses corrugated cardboard as a supporting layer, and the corrugated cardboard selects B flute, which has strong flat pressure resistance and is hard and not resistant to breakage. Flame-retardant coating is then coated on both sides of the corrugated cardboard and light-cured to improve the flame-retardant performance of the corrugated cardboard. Face paper and lining paper are glued to both sides of the corrugated cardboard, and the boxes are folded and assembled to prepare a pressure-resistant, flame-retardant transport carton. The carton not only has excellent pressure resistance, but also excellent flame-retardant performance, can be applied to product packaging and transportation needs, and is very practical.

Description

Technical Field

[0001] The present invention relates to the technical field of cartons, in particular to a flame-retardant and pressure-resistant transport carton and a manufacturing process thereof. Background Art

[0002] Cartons are the most widely used packaging products today and are an indispensable part of modern logistics. They bear the important responsibilities of containing, protecting products, and being aesthetically pleasing. Therefore, the physical performance indicators of packaging cartons become the basis for their quality assessment. In practice, cartons are generally folded and assembled from corrugated paper.

[0003] As an environmentally friendly cushioning material, corrugated cardboard is increasingly used in industries such as packaging, decoration, construction, and home furnishings, with usage increasing daily. However, due to the presence of large amounts of cellulose and hemicellulose, corrugated cardboard is flammable. Therefore, improving the flame retardancy of shipping cartons is a pressing technical challenge. Summary of the Invention

[0004] The object of the present invention is to provide a flame retardant and pressure resistant transport carton and a manufacturing process thereof, so as to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A manufacturing process for a flame-retardant, pressure-resistant transport carton comprises the following steps:

[0007] Step (1): Mix isophorone diisocyanate and a catalyst, then slowly dropwise add an alcohol monomer, keep the mixture at 60-65°C for 4-6 hours, then raise the temperature to 70-75°C, add phthalic anhydride polyester polyol, keep the mixture at 3-5 hours, and obtain a multifunctional polyurethane acrylate;

[0008] The alcohol monomer is hydroxypropyl acrylate or 1,3-propylene glycol diacrylate. When the alcohol monomer is hydroxypropyl acrylate, the reaction generates a low-functionality polyurethane acrylate; when the alcohol monomer is 1,3-propylene glycol diacrylate, the reaction generates a high-functionality polyurethane acrylate.

[0009] Step (2): octavinyl POSS, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, azobisisobutyronitrile and toluene are mixed, heated to 80-85°C under a nitrogen atmosphere, kept warm for 10-12 hours, cooled to room temperature after the reaction, the upper liquid is removed and the product is collected and dried to obtain a vinyl flame retardant;

[0010] Step (3): mixing low-functionality polyurethane acrylate and high-functionality polyurethane acrylate, adding reactive diluent, vinyl flame retardant and photoinitiator, stirring evenly, and standing until clear to obtain a flame retardant coating;

[0011] Flame-retardant coating is coated on both sides of the corrugated cardboard, and light-cured to obtain the flame-retardant corrugated cardboard. Face paper and lining paper are glued to both sides of the flame-retardant corrugated cardboard, and the cardboard is folded and assembled to obtain the transport carton.

[0012] In a more optimized solution, in step (1), the molar ratio of isophorone diisocyanate, alcohol monomer, and phthalic anhydride polyester polyol is (2~3): (2~3): 1; the catalyst is dibutyltin dilaurate, and the amount used is 0.3~0.4wt% of the total mass of isophorone diisocyanate and alcohol monomer.

[0013] In a more optimized solution, the phthalic anhydride polyester polyol is any one of difunctional phthalic anhydride polyester polyol and trifunctional phthalic anhydride polyester polyol, or a combination of the two.

[0014] In a more optimized solution, the molar ratio of difunctional phthalic anhydride polyester polyol and trifunctional phthalic anhydride polyester polyol is 1:1.

[0015] In a more optimized solution, in step (3), the amounts of the components used are: by mass, 40-50 parts of low-functionality polyurethane acrylate, 20-30 parts of high-functionality polyurethane acrylate, 25-30 parts of reactive diluent, 8-10 parts of vinyl flame retardant, and 2-3 parts of photoinitiator.

[0016] In the more optimized solution, in step (3), the active diluent is styrene, the photoinitiator is photoinitiator 1173, and the single-sided coating amount of the flame retardant coating is 10-15 g / m 2 .

[0017] In a more optimized solution, in step (2), the molar ratio of the octavinyl POSS and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is 1:(6~6.5), and the amount of azobisisobutyronitrile is 1~1.5wt% of the total mass of the octavinyl POSS and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide.

[0018] In a more optimized scheme, in step (2), the preparation steps of octavinyl POSS are as follows: vinyl triethoxysilane, acetone, concentrated hydrochloric acid and deionized water are mixed, reacted at 40-50°C for 20-24h, solids are precipitated, and washed with acetone to obtain octavinyl POSS.

[0019] A more optimized solution is a flame-retardant, pressure-resistant transport carton manufactured according to any of the manufacturing processes described above.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention discloses a flame-retardant, pressure-resistant transport carton and a manufacturing process thereof. The scheme uses corrugated cardboard as a supporting layer. The corrugated cardboard is selected as B flute, which has strong flat pressure resistance and is hard and not resistant to breakage. Flame-retardant coating is then coated on both sides of the corrugated cardboard and light-cured to improve the flame-retardant performance of the corrugated cardboard. Face paper and lining paper are glued to both sides of the corrugated cardboard, and the boxes are folded and assembled to prepare a pressure-resistant, flame-retardant transport carton. The carton not only has excellent pressure resistance, but also excellent flame-retardant performance, can be applied to product packaging and transportation needs, and is very practical.

[0022] This scheme uses low-functionality polyurethane acrylate and high-functionality polyurethane acrylate as the main components of flame-retardant coating, styrene as the active diluent, and photoinitiator 1173 to initiate light, thereby light-curing to form a flame-retardant coating on both sides of the corrugated cardboard. The scheme introduces high-functionality polyurethane acrylate to increase the cross-linking density of the coating, while controlling the ratio of low-functionality polyurethane acrylate and high-functionality polyurethane acrylate to ensure the waterproof performance of the coating. The hardness of the coating is also improved, which can further improve the compressive and burst resistance of the corrugated cardboard.

[0023] In the scheme, the present application first utilizes isophorone diisocyanate to react with an alcohol monomer under the action of a catalyst to generate a terminal isocyanate polymer monomer containing a vinyl group, and then utilizes the terminal isocyanate group to polymerize with the hydroxyl group of phthalic anhydride polyester polyol to generate a multifunctional polyurethane acrylate; the specific preparation includes the following situations:

[0024] (1) The alcohol monomer is hydroxypropyl acrylate, and the phthalic anhydride polyester polyol is a difunctional phthalic anhydride polyester polyol. At this time, the molar ratio of isophorone diisocyanate, alcohol monomer, and phthalic anhydride polyester polyol is 2:2:1, generating a low-functionality polyurethane acrylate containing two double bonds;

[0025] The alcohol monomer is 1,3-propylene glycol diacrylate, and the phthalic anhydride polyester polyol is a difunctional phthalic anhydride polyester polyol. At this time, the molar ratio of isophorone diisocyanate, alcohol monomer, and phthalic anhydride polyester polyol is 2:2:1, generating a high-functionality polyurethane acrylate containing four double bonds;

[0026] (2) The alcohol monomer is hydroxypropyl acrylate, and the phthalic anhydride polyester polyol is a trifunctional phthalic anhydride polyester polyol. At this time, the molar ratio of isophorone diisocyanate, alcohol monomer, and phthalic anhydride polyester polyol is 3:3:1, generating a low-functionality polyurethane acrylate containing three double bonds;

[0027] The alcohol monomer is 1,3-propanetriol diacrylate, and the phthalic anhydride polyester polyol is a trifunctional phthalic anhydride polyester polyol. At this time, the molar ratio of isophorone diisocyanate, alcohol monomer, and phthalic anhydride polyester polyol is 3:3:1, generating a high-functionality polyurethane acrylate containing 6 double bonds;

[0028] (3) Based on (1) and (2), the scheme was further optimized. At this time, the molar ratio of the phthalic anhydride polyester polyol was limited to 1:1 when the difunctional phthalic anhydride polyester polyol and the trifunctional phthalic anhydride polyester polyol were compounded. Under this limited parameter, the comprehensive performance of the coating finally prepared was the best.

[0029] At the same time, the plan also uses raw materials such as octavinyl POSS, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO), and azobisisobutyronitrile to react to obtain vinyl flame retardants; introducing vinyl flame retardants into the system can participate in the photocuring reaction and at the same time improve the flame retardant properties of corrugated cardboard. DETAILED DESCRIPTION

[0030] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0031] In the following examples, octavinyl POSS was prepared by mixing 10 mL of vinyltriethoxysilane, 75 mL of acetone, 12.5 mL of concentrated hydrochloric acid, and 15 mL of deionized water, reacting at 40° C. for 24 h, precipitating a solid, and washing with acetone to obtain octavinyl POSS.

[0032] Phthalic anhydride polyester polyol Mn=400, functionality 2 or 3; corrugated cardboard is B flute, gram weight 544.72g / m 2 .

[0033] Example 1: A process for manufacturing a flame-retardant, pressure-resistant transport carton, comprising the following steps:

[0034] Step (1): Mix isophorone diisocyanate and a catalyst, then slowly dropwise add an alcohol monomer, heat-retain at 60°C for 6 hours, then heat to 70°C, add phthalic anhydride polyester polyol, heat-retain for 5 hours, and react to obtain a multifunctional polyurethane acrylate;

[0035] The alcohol monomer is hydroxypropyl acrylate or 1,3-propylene glycol diacrylate. When the alcohol monomer is hydroxypropyl acrylate, the phthalic anhydride polyester polyol is a difunctional phthalic anhydride polyester polyol, and the reaction produces a low-functionality polyurethane acrylate. When the alcohol monomer is 1,3-propylene glycol diacrylate, the phthalic anhydride polyester polyol is a difunctional phthalic anhydride polyester polyol, and the reaction produces a high-functionality polyurethane acrylate.

[0036] During the reaction of low-functionality polyurethane acrylate and high-functionality polyurethane acrylate, the molar ratio of isophorone diisocyanate, alcohol monomer, and phthalic anhydride polyester polyol is 2:2:1; the catalyst is dibutyltin dilaurate, and the amount used is 0.35wt% of the total mass of isophorone diisocyanate and alcohol monomer.

[0037] Step (2): 0.2 mol of octavinyl POSS, 1.3 mol of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, azobisisobutyronitrile and 80 mL of toluene were mixed, heated to 80° C. under nitrogen atmosphere, kept warm for 12 h, cooled to room temperature after reaction, the upper liquid was removed, the solid was dissolved with dichloromethane and precipitated with ethyl acetate, and dried to obtain a vinyl flame retardant.

[0038] The molar ratio of the octavinyl POSS and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is 1:6.5, and the amount of azobisisobutyronitrile is 1.5 wt % of the total mass of the octavinyl POSS and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide.

[0039] Step (3): mixing low-functionality polyurethane acrylate and high-functionality polyurethane acrylate, adding active diluent, vinyl flame retardant and photoinitiator, stirring evenly, and standing until clear to obtain a flame retardant coating.

[0040] The amounts of the components used are as follows: 50 parts by mass of low-functionality polyurethane acrylate, 20 parts by mass of high-functionality polyurethane acrylate, 30 parts by mass of reactive diluent, 10 parts by mass of vinyl flame retardant, and 2.5 parts by mass of photoinitiator. The reactive diluent is styrene, and the photoinitiator is photoinitiator 1173.

[0041] Flame retardant coating is applied on both sides of the corrugated cardboard, with a single-side coating amount of 15g / m 2 , light curing to obtain a flame retardant corrugated cardboard, gluing face paper and lining paper on both sides of the flame retardant corrugated cardboard, folding and assembling to obtain the transport carton.

[0042] Example 2: A process for manufacturing a flame-retardant, pressure-resistant transport carton, comprising the following steps:

[0043] Step (1): Mix isophorone diisocyanate and a catalyst, then slowly dropwise add an alcohol monomer, keep the mixture at 65°C for 5 hours, then raise the temperature to 75°C, add phthalic anhydride polyester polyol, keep the mixture at 75°C for 4 hours, and obtain a multifunctional polyurethane acrylate;

[0044] The alcohol monomer is hydroxypropyl acrylate or 1,3-propylene glycol diacrylate. When the alcohol monomer is hydroxypropyl acrylate, the phthalic anhydride polyester polyol is a trifunctional phthalic anhydride polyester polyol, and the reaction produces a low-functionality polyurethane acrylate. When the alcohol monomer is 1,3-propylene glycol diacrylate, the phthalic anhydride polyester polyol is a trifunctional phthalic anhydride polyester polyol, and the reaction produces a high-functionality polyurethane acrylate.

[0045] During the reaction of low-functionality polyurethane acrylate and high-functionality polyurethane acrylate, the molar ratio of isophorone diisocyanate, alcohol monomer, and phthalic anhydride polyester polyol is 3:3:1; the catalyst is dibutyltin dilaurate, and the amount used is 0.35wt% of the total mass of isophorone diisocyanate and alcohol monomer.

[0046] Step (2): 0.2 mol of octavinyl POSS, 1.3 mol of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, azobisisobutyronitrile and 80 mL of toluene were mixed, heated to 85° C. under nitrogen atmosphere, kept warm for 11 h, cooled to room temperature after reaction, the upper liquid was removed, the solid was dissolved with dichloromethane and precipitated with ethyl acetate, and dried to obtain a vinyl flame retardant.

[0047] The molar ratio of the octavinyl POSS and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is 1:6.5, and the amount of azobisisobutyronitrile is 1.5 wt % of the total mass of the octavinyl POSS and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide.

[0048] Step (3): mixing low-functionality polyurethane acrylate and high-functionality polyurethane acrylate, adding active diluent, vinyl flame retardant and photoinitiator, stirring evenly, and standing until clear to obtain a flame retardant coating.

[0049] The amounts of the components used are as follows: 50 parts by mass of low-functionality polyurethane acrylate, 20 parts by mass of high-functionality polyurethane acrylate, 30 parts by mass of reactive diluent, 10 parts by mass of vinyl flame retardant, and 2.5 parts by mass of photoinitiator. The reactive diluent is styrene, and the photoinitiator is photoinitiator 1173.

[0050] Flame retardant coating is applied on both sides of the corrugated cardboard, with a single-side coating amount of 15g / m 2, light curing to obtain a flame retardant corrugated cardboard, gluing face paper and lining paper on both sides of the flame retardant corrugated cardboard, folding and assembling to obtain the transport carton.

[0051] Example 3: A process for manufacturing a flame-retardant, pressure-resistant transport carton, comprising the following steps:

[0052] Step (1): Mix isophorone diisocyanate and a catalyst, then slowly dropwise add an alcohol monomer, heat-retain at 65°C for 4 hours, then heat to 75°C, add phthalic anhydride polyester polyol, and heat-retain for 3 hours to obtain a multifunctional polyurethane acrylate;

[0053] The alcohol monomer is hydroxypropyl acrylate or 1,3-propylene glycol diacrylate. When the alcohol monomer is hydroxypropyl acrylate, the phthalic anhydride polyester polyol is a mixture of difunctional phthalic anhydride polyester polyol and trifunctional phthalic anhydride polyester in a molar ratio of 1:1, and the reaction generates a low-functionality polyurethane acrylate. When the alcohol monomer is 1,3-propylene glycol diacrylate, the phthalic anhydride polyester polyol is a mixture of difunctional phthalic anhydride polyester polyol and trifunctional phthalic anhydride polyester in a molar ratio of 1:1, and the reaction generates a high-functionality polyurethane acrylate.

[0054] During the reaction of low-functionality polyurethane acrylate and high-functionality polyurethane acrylate, the molar ratio of isophorone diisocyanate, alcohol monomer, and phthalic anhydride polyester polyol is 3:3:1; the catalyst is dibutyltin dilaurate, and the amount used is 0.35wt% of the total mass of isophorone diisocyanate and alcohol monomer.

[0055] Step (2): 0.2 mol of octavinyl POSS, 1.3 mol of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, azobisisobutyronitrile and 80 mL of toluene were mixed, heated to 85° C. under nitrogen atmosphere, kept warm for 10 h, cooled to room temperature after reaction, the upper liquid was removed, the solid was dissolved with dichloromethane and precipitated with ethyl acetate, and dried to obtain a vinyl flame retardant.

[0056] The molar ratio of the octavinyl POSS and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is 1:6.5, and the amount of azobisisobutyronitrile is 1.5 wt % of the total mass of the octavinyl POSS and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide.

[0057] Step (3): mixing low-functionality polyurethane acrylate and high-functionality polyurethane acrylate, adding active diluent, vinyl flame retardant and photoinitiator, stirring evenly, and standing until clear to obtain a flame retardant coating.

[0058] The amounts of the components used are as follows: 50 parts by mass of low-functionality polyurethane acrylate, 20 parts by mass of high-functionality polyurethane acrylate, 30 parts by mass of reactive diluent, 10 parts by mass of vinyl flame retardant, and 2.5 parts by mass of photoinitiator. The reactive diluent is styrene, and the photoinitiator is photoinitiator 1173.

[0059] Flame retardant coating is applied on both sides of the corrugated cardboard, with a single-side coating amount of 15g / m 2 , light curing to obtain a flame retardant corrugated cardboard, gluing face paper and lining paper on both sides of the flame retardant corrugated cardboard, folding and assembling to obtain the transport carton.

[0060] Comparative Example 1: Example 3 was used as a control group, and high-functionality polyurethane acrylate was not added in Comparative Example 1.

[0061] A manufacturing process for a flame-retardant, pressure-resistant transport carton comprises the following steps:

[0062] Step (1): Mix isophorone diisocyanate and a catalyst, then slowly dropwise add an alcohol monomer, heat-retain at 65°C for 4 hours, then heat to 75°C, add phthalic anhydride polyester polyol, and heat-retain for 3 hours to obtain a low-functionality polyurethane acrylate;

[0063] The alcohol monomer is hydroxypropyl acrylate; the phthalic anhydride polyester polyol is a compound of difunctional phthalic anhydride polyester polyol and trifunctional phthalic anhydride polyester, with a molar ratio of 1:1.

[0064] During the reaction of low-functionality polyurethane acrylate, the molar ratio of isophorone diisocyanate, alcohol monomer, and phthalic anhydride polyester polyol is 3:3:1; the catalyst is dibutyltin dilaurate, and the amount used is 0.35wt% of the total mass of isophorone diisocyanate and alcohol monomer.

[0065] Step (2): 0.2 mol of octavinyl POSS, 1.3 mol of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, azobisisobutyronitrile and 80 mL of toluene were mixed, heated to 85° C. under nitrogen atmosphere, kept warm for 10 h, cooled to room temperature after reaction, the upper liquid was removed, the solid was dissolved with dichloromethane and precipitated with ethyl acetate, and dried to obtain a vinyl flame retardant.

[0066] The molar ratio of the octavinyl POSS and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is 1:6.5, and the amount of azobisisobutyronitrile is 1.5 wt % of the total mass of the octavinyl POSS and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide.

[0067] Step (3): mixing low-functionality polyurethane acrylate and high-functionality polyurethane acrylate, adding active diluent, vinyl flame retardant and photoinitiator, stirring evenly, and standing until clear to obtain a flame retardant coating.

[0068] The amounts of the components used are as follows: 70 parts by mass of low-functionality polyurethane acrylate, 30 parts by mass of reactive diluent, 10 parts by mass of vinyl flame retardant, and 2.5 parts by mass of photoinitiator. The reactive diluent is styrene, and the photoinitiator is photoinitiator 1173.

[0069] Flame retardant coating is applied on both sides of the corrugated cardboard, with a single-side coating amount of 15g / m 2 , light curing to obtain a flame retardant corrugated cardboard, gluing face paper and lining paper on both sides of the flame retardant corrugated cardboard, folding and assembling to obtain the transport carton.

[0070] Comparative Example 2: Example 3 was used as a control group, and the ratio of the high-functionality polyurethane acrylate to the low-functionality polyurethane acrylate was adjusted in Comparative Example 2.

[0071] A manufacturing process for a flame-retardant, pressure-resistant transport carton comprises the following steps:

[0072] Step (1): Mix isophorone diisocyanate and a catalyst, then slowly dropwise add an alcohol monomer, heat-retain at 65°C for 4 hours, then heat to 75°C, add phthalic anhydride polyester polyol, and heat-retain for 3 hours to obtain a multifunctional polyurethane acrylate;

[0073] The alcohol monomer is hydroxypropyl acrylate or 1,3-propylene glycol diacrylate. When the alcohol monomer is hydroxypropyl acrylate, the phthalic anhydride polyester polyol is a mixture of difunctional phthalic anhydride polyester polyol and trifunctional phthalic anhydride polyester in a molar ratio of 1:1, and the reaction generates a low-functionality polyurethane acrylate. When the alcohol monomer is 1,3-propylene glycol diacrylate, the phthalic anhydride polyester polyol is a mixture of difunctional phthalic anhydride polyester polyol and trifunctional phthalic anhydride polyester in a molar ratio of 1:1, and the reaction generates a high-functionality polyurethane acrylate.

[0074] During the reaction of low-functionality polyurethane acrylate and high-functionality polyurethane acrylate, the molar ratio of isophorone diisocyanate, alcohol monomer, and phthalic anhydride polyester polyol is 3:3:1; the catalyst is dibutyltin dilaurate, and the amount used is 0.35wt% of the total mass of isophorone diisocyanate and alcohol monomer.

[0075] Step (2): 0.2 mol of octavinyl POSS, 1.3 mol of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, azobisisobutyronitrile and 80 mL of toluene were mixed, heated to 85° C. under nitrogen atmosphere, kept warm for 10 h, cooled to room temperature after reaction, the upper liquid was removed, the solid was dissolved with dichloromethane and precipitated with ethyl acetate, and dried to obtain a vinyl flame retardant.

[0076] The molar ratio of the octavinyl POSS and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is 1:6.5, and the amount of azobisisobutyronitrile is 1.5 wt % of the total mass of the octavinyl POSS and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide.

[0077] Step (3): mixing low-functionality polyurethane acrylate and high-functionality polyurethane acrylate, adding active diluent, vinyl flame retardant and photoinitiator, stirring evenly, and standing until clear to obtain a flame retardant coating.

[0078] The amounts of the components used are as follows: 20 parts by mass of low-functionality polyurethane acrylate, 50 parts by mass of high-functionality polyurethane acrylate, 30 parts by mass of reactive diluent, 10 parts by mass of vinyl flame retardant, and 2.5 parts by mass of photoinitiator. The reactive diluent is styrene, and the photoinitiator is photoinitiator 1173.

[0079] Flame retardant coating is applied on both sides of the corrugated cardboard, with a single-side coating amount of 15g / m 2 , light curing to obtain a flame retardant corrugated cardboard, gluing face paper and lining paper on both sides of the flame retardant corrugated cardboard, folding and assembling to obtain the transport carton.

[0080] Comparative Example 3: Taking Example 3 as the control group, the amount of the vinyl flame retardant in Comparative Example 3 was .

[0081] A manufacturing process for a flame-retardant, pressure-resistant transport carton comprises the following steps:

[0082] Step (1): Mix isophorone diisocyanate and a catalyst, then slowly dropwise add an alcohol monomer, heat-retain at 65°C for 4 hours, then heat to 75°C, add phthalic anhydride polyester polyol, and heat-retain for 3 hours to obtain a multifunctional polyurethane acrylate;

[0083] The alcohol monomer is hydroxypropyl acrylate or 1,3-propylene glycol diacrylate. When the alcohol monomer is hydroxypropyl acrylate, the phthalic anhydride polyester polyol is a mixture of difunctional phthalic anhydride polyester polyol and trifunctional phthalic anhydride polyester in a molar ratio of 1:1, and the reaction generates a low-functionality polyurethane acrylate. When the alcohol monomer is 1,3-propylene glycol diacrylate, the phthalic anhydride polyester polyol is a mixture of difunctional phthalic anhydride polyester polyol and trifunctional phthalic anhydride polyester in a molar ratio of 1:1, and the reaction generates a high-functionality polyurethane acrylate.

[0084] During the reaction of low-functionality polyurethane acrylate and high-functionality polyurethane acrylate, the molar ratio of isophorone diisocyanate, alcohol monomer, and phthalic anhydride polyester polyol is 3:3:1; the catalyst is dibutyltin dilaurate, and the amount used is 0.35wt% of the total mass of isophorone diisocyanate and alcohol monomer.

[0085] Step (2): 0.2 mol of octavinyl POSS, 1.3 mol of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, azobisisobutyronitrile and 80 mL of toluene were mixed, heated to 85° C. under nitrogen atmosphere, kept warm for 10 h, cooled to room temperature after reaction, the upper liquid was removed, the solid was dissolved with dichloromethane and precipitated with ethyl acetate, and dried to obtain a vinyl flame retardant.

[0086] The molar ratio of the octavinyl POSS and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is 1:6.5, and the amount of azobisisobutyronitrile is 1.5 wt % of the total mass of the octavinyl POSS and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide.

[0087] Step (3): mixing low-functionality polyurethane acrylate and high-functionality polyurethane acrylate, adding active diluent, vinyl flame retardant and photoinitiator, stirring evenly, and standing until clear to obtain a flame retardant coating.

[0088] The amounts of the components used are as follows: 50 parts by mass of low-functionality polyurethane acrylate, 20 parts by mass of high-functionality polyurethane acrylate, 30 parts by mass of reactive diluent, 5 parts by mass of vinyl flame retardant, and 2.5 parts by mass of photoinitiator. The reactive diluent is styrene, and the photoinitiator is photoinitiator 1173.

[0089] Flame retardant coating is applied on both sides of the corrugated cardboard, with a single-side coating amount of 15g / m 2 , light curing to obtain a flame retardant corrugated cardboard, gluing face paper and lining paper on both sides of the flame retardant corrugated cardboard, folding and assembling to obtain the transport carton.

[0090] Detection experiment:

[0091] 1. Flame-retardant corrugated paperboard was prepared according to the methods disclosed in Examples 1-3 and Comparative Examples 1-3. The limiting oxygen index of the samples was tested according to the method disclosed in GB / T 5454-1997. The bursting strength of the samples was tested according to the method disclosed in GB / T 6545-1998. The water absorption of the samples was tested according to the method disclosed in GB / T 1540-2002 for 120 seconds. Specific test data are shown in Table 1.

[0092] Table 1

[0093]

[0094] Conclusion: The scheme uses corrugated cardboard as the supporting layer. The corrugated cardboard is selected as B flute, which has strong flat pressure resistance and is hard and not resistant to breakage. Flame retardant coating is then coated on both sides of the corrugated cardboard and light-cured to improve the flame retardant properties of the corrugated cardboard. The face paper and lining paper are glued on both sides of the corrugated cardboard, and folded and assembled to prepare a pressure-resistant flame retardant transport carton. This carton not only has excellent pressure resistance, but also excellent flame retardant properties. It can be used for product packaging and transportation needs and is very practical.

[0095] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

Claims

1. A process for manufacturing a flame-retardant, pressure-resistant transport carton, characterized by: The following steps are involved: Step (1): mixing isophorone diisocyanate and a catalyst, then slowly adding an alcohol monomer dropwise, keeping the temperature at 60-65°C for reaction for 4-6 hours, then raising the temperature to 70-75°C, adding phthalic anhydride polyester polyol, keeping the temperature at reaction for 3-5 hours, and reacting to obtain a multifunctional polyurethane acrylate; the alcohol monomer is hydroxypropyl acrylate or 1,3-propylene glycol diacrylate; when the alcohol monomer is hydroxypropyl acrylate, the reaction generates a low-functionality polyurethane acrylate; when the alcohol monomer is 1,3-propylene glycol diacrylate, the reaction generates a high-functionality polyurethane acrylate; Step (2): octavinyl POSS, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, azobisisobutyronitrile and toluene are mixed, heated to 80-85°C under a nitrogen atmosphere, kept warm for 10-12 hours, cooled to room temperature after the reaction, the upper liquid is removed and the product is collected and dried to obtain a vinyl flame retardant; Step (3): mixing low-functionality polyurethane acrylate and high-functionality polyurethane acrylate, adding a reactive diluent, a vinyl flame retardant and a photoinitiator, stirring evenly, and standing until clarified to obtain a flame-retardant coating; coating the flame-retardant coating on both sides of the corrugated cardboard, light-curing to obtain a flame-retardant corrugated cardboard, gluing face paper and lining paper on both sides of the flame-retardant corrugated cardboard, folding and assembling to obtain the transport carton; In step (1), the molar ratio of isophorone diisocyanate, alcohol monomer, and phthalic anhydride polyester polyol is (2-3): (2-3): 1; the catalyst is dibutyltin dilaurate, and the amount used is 0.3-0.4wt% of the total mass of isophorone diisocyanate and alcohol monomer; The phthalic anhydride polyester polyol is obtained by compounding difunctional phthalic anhydride polyester polyol and trifunctional phthalic anhydride polyester; The molar ratio of difunctional phthalic anhydride polyester polyol and trifunctional phthalic anhydride polyester polyol is 1:1; In step (3), the amounts of the components are as follows: by mass: 40-50 parts of low-functionality polyurethane acrylate, 20-30 parts of high-functionality polyurethane acrylate, 25-30 parts of reactive diluent, 8-10 parts of vinyl flame retardant, and 2-3 parts of photoinitiator; In step (2), the molar ratio of the octavinyl POSS and the 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is 1:(6-6.5), and the amount of the azobisisobutyronitrile is 1-1.5 wt % of the total mass of the octavinyl POSS and the 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide.

2. The manufacturing process of a flame-retardant, pressure-resistant transport carton according to claim 1, characterized in that: In step (3), the active diluent is styrene, the photoinitiator is photoinitiator 1173; the single-side coating amount of the flame retardant coating is 10-15g / m 2 .

3. The manufacturing process of a flame-retardant, pressure-resistant transport carton according to claim 1, characterized in that: In step (2), the preparation steps of octavinyl POSS are: vinyl triethoxysilane, acetone, concentrated hydrochloric acid and deionized water are mixed, reacted at 40-50° C. for 20-24 hours, solids are precipitated, and washed with acetone to obtain octavinyl POSS.

4. A flame-retardant, pressure-resistant transport carton manufactured according to the manufacturing process according to any one of claims 1 to 3.

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