Corrosion-resistant polypropylene edge strip material and method of making same

Abstract

This invention discloses a corrosion-resistant polypropylene edge banding material and its preparation method, belonging to the technical field of edge banding material preparation. The corrosion-resistant polypropylene edge banding material comprises the following components by weight: 50-75 parts polypropylene, 2-5 parts antioxidant, 3-6 parts corrosion retardant, 2-4 parts composite flame retardant, 8-15 parts calcium carbonate, and 2-4 parts dye. The corrosion retardant is prepared from 2,6-dichlorobenzonitrile, 1,2,4-triazole, sulfuric acid solution, sodium nitrite, and p-chloroaniline. The composite flame retardant is prepared from 3-glycidyl etheroxypropyltrimethoxysilane, diphenylsilanediol, barium hydroxide, and boric acid. The edge banding material prepared by this method exhibits excellent corrosion resistance, flame retardancy, heat resistance, and mechanical properties.

Description

Technical Field

[0001] This invention belongs to the field of edge banding material preparation technology, specifically relating to a corrosion-resistant polypropylene edge banding material and its preparation method. Background Technology

[0002] Polypropylene, a semi-crystalline thermoplastic, possesses excellent physical and chemical properties and is widely used in various fields. Its compact molecular structure, lacking polar groups, gives it excellent chemical stability, resisting corrosion from various acids and alkalis, including some organic solvents, demonstrating outstanding chemical resistance. This characteristic makes polypropylene an ideal choice for manufacturing corrosion-resistant edge-sealing materials. Furthermore, polypropylene is an environmentally friendly material, non-toxic and odorless, recyclable, and aligns with modern environmental protection concepts, satisfying consumers' pursuit of a healthy and environmentally friendly lifestyle.

[0003] In the furniture manufacturing industry, the performance of edge banding directly affects the durability and aesthetics of furniture. Traditional PVC edge banding, while lightweight, easy to process, and possessing certain oil, heat, and wear resistance, suffers from inconsistent quality, noticeable color differences after trimming, and is prone to aging and breakage, failing to meet the material performance requirements of high-end furniture. ABS edge banding, while wear-resistant, corrosion-resistant, aging-resistant, fire-resistant, moisture-proof, and environmentally friendly, with good dimensional stability and strong impact resistance, is expensive, limiting its application. Polypropylene edge banding, on the other hand, inherits many advantages of polypropylene, including lightweight, wear resistance, environmental friendliness, and a high softening point, making it a preferred material for furniture manufacturing.

[0004] Patent CN112574500B discloses a high-rigidity, high-heat-sealing-strength polypropylene material and its preparation method. The composition includes: 88.5-94.2% polypropylene resin; 5-10% reinforcing agent; and 0.7-1.5% other additives. The reinforcing agent is modified wollastonite. The preparation method involves: weighing half the amount of polypropylene resin and adding it to a high-speed mixer; then adding all raw materials except the modified wollastonite to the mixer and mixing thoroughly to obtain a mixture; feeding the mixture into the main feed inlet of an extruder; adding the modified wollastonite from the side feed inlet of the extruder; extruding and granulating to obtain wollastonite masterbatch; and melting the extrusion temperature at 185-200℃. The wollastonite masterbatch is then mixed evenly with the remaining half of the polypropylene resin to prepare a polypropylene material with high strength and high heat-sealing strength. However, the corrosion resistance, heat resistance, and flame retardant properties of the polypropylene material prepared by this method still have room for improvement. Summary of the Invention

[0005] The purpose of this invention is to provide a corrosion-resistant polypropylene edge banding material and its preparation method, which solves the technical problems of poor corrosion resistance, heat resistance and flame retardancy of polypropylene materials in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This invention provides a corrosion-resistant polypropylene edge banding material, composed of the following components by weight: 50-75 parts polypropylene, 2-5 parts antioxidant, 3-6 parts corrosion resistant agent, 2-4 parts composite flame retardant, 8-15 parts calcium carbonate, and 2-4 parts dye. The corrosion resistant agent is prepared from 2,6-dichlorobenzonitrile, 1,2,4-triazole, sulfuric acid solution, sodium nitrite, and p-chloroaniline. The composite flame retardant is prepared from 3-glycidyl etheroxypropyltrimethoxysilane, diphenylsilanediol, barium hydroxide, and boric acid.

[0008] Preferably, the antioxidant is composed of one or more of antioxidant 1010, antioxidant 1076, antioxidant 168 and antioxidant 626.

[0009] Preferably, the method for preparing the corrosion resistant agent includes the following steps:

[0010] Q1: Add 2,6-dichlorobenzonitrile, 1,2,4-triazole and anhydrous potassium carbonate to a container containing N,N-dimethylformamide, heat to react, filter under reduced pressure after the reaction is complete, and repeat the operation to obtain intermediate 1;

[0011] Q2: Add intermediate 1 to a container, then add sulfuric acid solution, heat to react, after the reaction is complete, add distilled water, adjust the pH, filter under reduced pressure, extract, dry and distill under reduced pressure to obtain intermediate 2;

[0012] Q3: Add intermediate 2 to a container placed in an ice bath, add sulfuric acid solution, wait for the temperature of the reaction solution to drop, add distilled water containing sodium nitrite dropwise, continue the reaction after the addition is complete, then raise the temperature to react, after the reaction is complete, extract, dry, and distill under reduced pressure to obtain intermediate 3;

[0013] Q4: Add intermediate 3 to a container with toluene and a reflux and gas collection device. Under heating conditions, slowly add thionyl chloride to react. Under negative pressure, add toluene and then add p-chloroaniline. Heat the reaction and add triethylamine dropwise during the reaction. After the reaction is complete, wash, let stand to separate the layers, wash the organic phase, dry, filter, and evaporate to dryness under negative pressure to obtain the corrosion resistant agent.

[0014] In the above process, 2,6-dichlorobenzonitrile, in the presence of anhydrous potassium carbonate and using N,N-dimethylformamide as a medium, undergoes condensation with 1,2,4-triazole to obtain intermediate 1. Intermediate 1 is then hydrolyzed in sulfuric acid solution to transform into intermediate 2. Intermediate 2 is then converted into intermediate 3 through diazotization and hydrolysis. Intermediate 3, in the presence of thionyl chloride and p-chloroaniline, is used to prepare a corrosion inhibitor. The synthesis reaction formula for the corrosion inhibitor is as follows:

[0015]

[0016] The mass spectrometry analysis results of intermediate 1 were: m / z: 204.02 (100.0%), 206.02 (32.1%), 205.02 (11.2%), 207.02 (3.1%); the mass spectrometry analysis results of intermediate 2 were: m / z: 222.03 (100.0%), 224.03 (32.1%), 223.03 (11.2%), 225.03 (3.2%); the mass spectrometry analysis results of intermediate 3 were: m / z: 223.01 (100.0%), 225.01 (32.0%), 224.02 (9.9%), 226.02 (3.2%), 224.01 (1.1%). 225.02 (1.0%); The mass spectrometry analysis results of the corrosion resistant agent are as follows: m / z: 332.02 (100.0%), 334.02 (64.2%), 333.03 (16.4%), 335.02 (11.3%), 336.02 (10.5%), 337.02 (1.7%), 333.02 (1.5%), 334.03 (1.5%).

[0017] Preferably, in Q1, the ratio of 2,6-dichlorobenzonitrile, 1,2,4-triazole, anhydrous potassium carbonate, and N,N-dimethylformamide is (1-1.5) g : (0.6-0.9) g : (1.04-1.56) g : (10-15) mL, the reaction temperature is 80-90℃, the reaction time is 10-14 h, and the operation is repeated 2-4 times; in Q2, the ratio of intermediate 1 to sulfuric acid solution is (0.5-0.9) g : (12-18) g, the volume fraction of sulfuric acid solution is 80 vt%, the reaction temperature is 90-110℃, the reaction time is 9-11 h, and the pH is adjusted to 7-8.

[0018] Preferably, in Q3, the ratio of intermediate 2, sulfuric acid solution, sodium nitrite, and distilled water is (0.5-0.75) g : (20-30) g : (0.46-0.69) g : (1.38-2.12) mL, the volume fraction of the sulfuric acid solution is 80 wt%, the temperature is lowered to 8-10℃, the reaction time is continued for 1-2 h, the reaction temperature is raised to 90-100℃, the reaction time is 2-3 h, and distilled water is added for extraction; in Q4, intermediate 3, toluene, and chloride... The ratio of sulfoxide, added toluene, p-chloroaniline, and triethylamine is (0.5-0.7) g : (20-30) mL : (0.6-0.8) g : (30-45) mL : (0.4-0.6) g : (1-1.2) mL. The heating conditions are 100-110℃ and the reaction time is 2-3 h. After adding p-chloroaniline, the heating temperature is 80-85℃ and the reaction time is 4-6 h. The organic phase is washed with saturated sodium chloride and then washed with distilled water at 40-50℃.

[0019] Preferably, the preparation method of the composite flame retardant includes the following steps:

[0020] S1: Add 3-glycidyl etheroxypropyltrimethoxysilane, diphenylsilanediol and barium hydroxide to a container, stir and mix evenly, then introduce nitrogen gas and heat to react. After the reaction is completed, dry under vacuum to obtain a pale yellow substance.

[0021] S2: Add the pale yellow substance, boric acid and anhydrous ethanol to a container, stir, heat and reflux to react, filter under reduced pressure to obtain a prepolymer, and place the prepolymer in a vacuum oven to obtain a composite flame retardant.

[0022] In the above process, a pale yellow substance was prepared by non-hydrolytic sol-gel method using 3-glycidyl etheroxypropyltrimethoxysilane and diphenylsilanediol as raw materials and anhydrous ethanol as solvent. Subsequently, the pale yellow substance and boric acid were dehydrated and condensed to prepare a composite flame retardant.

[0023] Preferably, in S1, the ratio of 3-glycidyl etheroxypropyltrimethoxysilane, diphenylsilanediol and barium hydroxide is (20-25) g: (27.46-35.12) g: (0.09-0.13) g, the heating reaction temperature is 80-85℃, the reaction time is 6-8 h, the vacuum drying temperature is 60-70℃, and the drying time is 3-5 h.

[0024] Preferably, in step S2, the ratio of the pale yellow substance, boric acid, and anhydrous ethanol is (5-7.5) g:(1-1.5) g:(1-1.5) mL, the stirring time is 10-15 min, the heating and reflux reaction temperature is 170-180℃, the rotation speed is 500-700 rpm, the reaction time is 6-8 h, the temperature of the vacuum oven is 80-85℃, the vacuum degree is -2500~-3000 kPa, and the time is 20-24 h.

[0025] Preferably, the method for preparing the corrosion-resistant polypropylene edge banding material includes the following steps:

[0026] Step 1: Add polypropylene, antioxidant, corrosion resistant agent, composite flame retardant, calcium carbonate and fuel to a mixing tank, stir and mix evenly to obtain a mixture;

[0027] Step 2: Add the mixture to a high-temperature melting machine for melting, extrusion, cooling, and curing to obtain corrosion-resistant polypropylene edge sealing strip material.

[0028] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0029] 1. This invention first prepares a corrosion resistant agent using 2,6-dichlorobenzonitrile, 1,2,4-triazole, sulfuric acid solution, sodium nitrite, and p-chloroaniline as raw materials. Subsequently, a composite flame retardant is prepared using 3-glycidyl etheroxypropyltrimethoxysilane, diphenylsilanediol, barium hydroxide, and boric acid as raw materials. By simultaneously adding the corrosion resistant agent and the composite flame retardant to the polypropylene edge sealing strip material, the resulting material can possess excellent corrosion resistance, heat resistance, flame retardancy, and mechanical properties.

[0030] 2. This invention adds the prepared corrosion resistant agent to polypropylene edge sealing strip material, which can effectively improve the material's corrosion resistance and heat resistance. The triazole group contained in the corrosion resistant agent has excellent chemical stability, thus resisting the erosion of various chemical media. The corrosion resistant agent can also form hydrogen bonds and coordination bonds with the polypropylene material, thereby forming a dense protective film that effectively blocks corrosive media. The contained benzene ring structure, as a stable aromatic structure, not only enhances the overall molecular stability but also acts as a barrier to block corrosive media. At the same time, its high-temperature stability ensures that the material maintains stable performance at high temperatures. The contained amide bond, as a strong polar bond, enhances the intermolecular interaction force, making the corrosion resistant agent more tightly bonded to polypropylene, forming a strong protective film, while improving heat resistance and preventing the breakage or recombination of chemical bonds at high temperatures.

[0031] 3. This invention adds the prepared composite flame retardant to polypropylene edge sealing strip material, which can effectively improve the flame retardant and mechanical properties of the material. The silicon, boron and benzene rings contained in the composite flame retardant can form an effective flame retardant barrier to block heat transfer and flame spread. At the same time, the silicon-oxygen bonds and boron-oxygen bonds contained therein can remain stable under high temperature conditions, slowing down the combustion rate. The benzene ring structure absorbs heat and can undergo pyrolysis, producing gas and water vapor to dilute the combustible gas and reduce the combustion intensity. Furthermore, the silicon-oxygen bonds and cross-linking structure in the composite flame retardant enhance the interaction force between polypropylene molecular chains, thereby improving the mechanical properties. Detailed Implementation

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1: This example discloses a method for preparing a corrosion resistant agent, including the following steps:

[0034] Q1: Add 1.25g of 2,6-dichlorobenzonitrile, 0.75g of 1,2,4-triazole and 1.3g of anhydrous potassium carbonate to a container containing 12.5mL of N,N-dimethylformamide, heat at 90℃ for 12h, filter under reduced pressure after the reaction is complete, and repeat the operation 3 times to obtain intermediate 1;

[0035] Q2: Add 0.7g of intermediate 1 to a container, then add 15g of sulfuric acid solution with a volume fraction of 80vt%, heat at 100℃ for 10h, after the reaction is complete, add distilled water, adjust pH=7, filter under reduced pressure, extract, dry and distill under reduced pressure to obtain intermediate 2.

[0036] Q3: Add 0.63g of intermediate 2 to a container placed in an ice bath, add 25g of sulfuric acid solution with a volume fraction of 80vt%, and wait for the temperature of the reaction solution to drop to 8℃. Add 1.75mL of distilled water containing 0.57g of sodium nitrite dropwise. After the addition is complete, continue the reaction for 1h, then raise the temperature to 100℃ and react for 3h. After the reaction is complete, add distilled water for extraction, dry, and distill under reduced pressure to obtain intermediate 3.

[0037] Q4: Add 0.6g of intermediate 3 to a container with 25mL of toluene and a reflux and gas collection device. Under 110℃, slowly add 0.7g of thionyl chloride and react for 3h. After negative pressure treatment, add 37.5mL of toluene and then add 0.5g of p-chloroaniline. Heat at 85℃ for 6h. During the reaction, add 1.1mL of triethylamine dropwise. After the reaction is complete, wash with saturated sodium chloride, allow to stand and separate into layers, wash the organic phase with distilled water at 40℃, dry, filter, and evaporate to dryness under negative pressure to obtain the corrosion resistant agent.

[0038] This embodiment discloses a method for preparing a composite flame retardant, including the following steps:

[0039] S1: Add 22.5g of 3-glycidyl etheroxypropyltrimethoxysilane, 31.59g of diphenylsilanediol and 0.11g of barium hydroxide to a container, stir and mix evenly, then introduce nitrogen gas and heat at 85℃ for 8h. After the reaction is completed, dry under vacuum at 65℃ for 4h to obtain a pale yellow substance.

[0040] S2: Add 6.25g of pale yellow substance, 1.25g of boric acid and 1.25mL of anhydrous ethanol to a container, stir for 15min, heat to 180℃, reflux at 700rpm for 8h, filter under reduced pressure to obtain a prepolymer, place the prepolymer in a vacuum oven at 85℃ and -2500kPa for 24h to obtain a composite flame retardant.

[0041] This embodiment discloses a corrosion-resistant polypropylene edge banding material, which is composed of the following components in parts by weight: 62.5 parts polypropylene, 3.5 parts antioxidant 1010, 4.5 parts corrosion resistant agent, 3 parts composite flame retardant, 11.5 parts calcium carbonate, and 3 parts dye.

[0042] This embodiment discloses a method for preparing a corrosion-resistant polypropylene edge banding material, including the following steps:

[0043] Step 1: Add polypropylene, antioxidant 1010, corrosion retardant, composite flame retardant, calcium carbonate and fuel to a mixing tank, stir and mix evenly to obtain a mixture;

[0044] Step 2: Add the mixture to a high-temperature melting machine for melting, extrusion, cooling, and curing to obtain corrosion-resistant polypropylene edge sealing strip material.

[0045] Example 2: This example discloses a method for preparing a corrosion resistant agent, including the following steps:

[0046] Q1: Add 1.5g of 2,6-dichlorobenzonitrile, 0.6g of 1,2,4-triazole and 1.04g of anhydrous potassium carbonate to a container containing 10mL of N,N-dimethylformamide, heat at 90℃ for 12h, filter under reduced pressure after the reaction is complete, and repeat the operation 3 times to obtain intermediate 1;

[0047] Q2: Add 0.5g of intermediate 1 to a container, then add 18g of sulfuric acid solution with a volume fraction of 80vt%, heat at 100℃ for 10h, after the reaction is complete, add distilled water, adjust pH=7, filter under reduced pressure, extract, dry and distill under reduced pressure to obtain intermediate 2.

[0048] Q3: Add 0.5g of intermediate 2 to a container placed in an ice bath, add 20g of sulfuric acid solution with a volume fraction of 80vt%, and wait for the temperature of the reaction solution to drop to 8℃. Then add 1.38mL of distilled water containing 0.46g of sodium nitrite. After the addition is complete, continue the reaction for 1h, then raise the temperature to 100℃ and react for 3h. After the reaction is complete, add distilled water for extraction, dry, and distill under reduced pressure to obtain intermediate 3.

[0049] Q4: Add 0.5g of intermediate 3 to a container with reflux and gas collection devices containing 30mL of toluene. Under 110℃, slowly add 0.6g of thionyl chloride and react for 3h. After negative pressure treatment, add another 30mL of toluene, then add 0.4g of p-chloroaniline. Heat at 85℃ for 6h. During the reaction, add 1.2mL of triethylamine dropwise. After the reaction is complete, wash with saturated sodium chloride, allow to stand and separate into layers, wash the organic phase with distilled water at 40℃, dry, filter, and evaporate to dryness under negative pressure to obtain the corrosion resistant agent.

[0050] This embodiment discloses a method for preparing a composite flame retardant, including the following steps:

[0051] S1: Add 20g of 3-glycidyl etheroxypropyltrimethoxysilane, 27.46g of diphenylsilanediol and 0.09g of barium hydroxide to a container, stir and mix evenly, then introduce nitrogen gas and heat at 85℃ for 8h. After the reaction is completed, dry under vacuum at 65℃ for 4h to obtain a pale yellow substance.

[0052] S2: Add 5g of pale yellow substance, 1.5g of boric acid and 1mL of anhydrous ethanol to a container, stir for 15min, heat to 180℃, reflux at 700rpm for 8h, filter under reduced pressure to obtain a prepolymer, place the prepolymer in a vacuum oven at 85℃ and -2500kPa for 24h to obtain a composite flame retardant.

[0053] This embodiment discloses a corrosion-resistant polypropylene edge banding material, which is composed of the following components in parts by weight: 50 parts polypropylene, 5 parts antioxidant 1010, 3 parts corrosion resistant agent, 2 parts composite flame retardant, 8 parts calcium carbonate, and 2 parts dye.

[0054] This embodiment discloses a method for preparing a corrosion-resistant polypropylene edge banding material, including the following steps:

[0055] Step 1: Add polypropylene, antioxidant 1010, corrosion retardant, composite flame retardant, calcium carbonate and fuel to a mixing tank, stir and mix evenly to obtain a mixture;

[0056] Step 2: Add the mixture to a high-temperature melting machine for melting, extrusion, cooling, and curing to obtain corrosion-resistant polypropylene edge sealing strip material.

[0057] Example 3: This example discloses a method for preparing a corrosion-resistant agent, including the following steps:

[0058] Q1: Add 1g of 2,6-dichlorobenzonitrile, 0.9g of 1,2,4-triazole and 1.56g of anhydrous potassium carbonate to a container containing 15mL of N,N-dimethylformamide, heat at 90℃ for 12h, filter under reduced pressure after the reaction is complete, and repeat the operation 3 times to obtain intermediate 1;

[0059] Q2: Add 0.9g of intermediate 1 to a container, then add 12g of sulfuric acid solution with a volume fraction of 80vt%, heat at 100℃ for 10h, after the reaction is complete, add distilled water, adjust pH=7, filter under reduced pressure, extract, dry and distill under reduced pressure to obtain intermediate 2;

[0060] Q3: Add 0.75g of intermediate 2 to a container placed in an ice bath, add 30g of sulfuric acid solution with a volume fraction of 80vt%, and wait for the temperature of the reaction solution to drop to 8℃. Add 2.12mL of distilled water containing 0.69g of sodium nitrite dropwise. After the addition is complete, continue the reaction for 1h, then raise the temperature to 100℃ and react for 3h. After the reaction is complete, add distilled water for extraction, dry, and distill under reduced pressure to obtain intermediate 3.

[0061] Q4: Add 0.7g of intermediate 3 to a container with 20mL of toluene and a reflux and gas collection device. Under 110℃, slowly add 0.8g of thionyl chloride and react for 3h. After negative pressure treatment, add 45mL of toluene and then add 0.6g of p-chloroaniline. Heat at 85℃ for 6h. During the reaction, add 1mL of triethylamine dropwise. After the reaction is complete, wash with saturated sodium chloride, allow to stand and separate into layers, wash the organic phase with distilled water at 40℃, dry, filter, and evaporate to dryness under negative pressure to obtain the corrosion resistant agent.

[0062] This embodiment discloses a method for preparing a composite flame retardant, including the following steps:

[0063] S1: Add 25g of 3-glycidyl etheroxypropyltrimethoxysilane, 35.12g of diphenylsilanediol and 0.13g of barium hydroxide to a container, stir and mix evenly, then introduce nitrogen gas and heat at 85℃ for 8h. After the reaction is completed, dry under vacuum at 65℃ for 4h to obtain a pale yellow substance.

[0064] S2: Add 7.5g of pale yellow substance, 1g of boric acid and 1.5mL of anhydrous ethanol to a container, stir for 15min, heat to 180℃, reflux at 700rpm for 8h, filter under reduced pressure to obtain a prepolymer, place the prepolymer in a vacuum oven at 85℃ and -2500kPa for 24h to obtain a composite flame retardant.

[0065] This embodiment discloses a corrosion-resistant polypropylene edge banding material, which is composed of the following components in parts by weight: 75 parts polypropylene, 2 parts antioxidant 1010, 6 parts corrosion resistant agent, 4 parts composite flame retardant, 15 parts calcium carbonate, and 4 parts dye.

[0066] This embodiment discloses a method for preparing a corrosion-resistant polypropylene edge banding material, including the following steps:

[0067] Step 1: Add polypropylene, antioxidant 1010, corrosion retardant, composite flame retardant, calcium carbonate and fuel to a mixing tank, stir and mix evenly to obtain a mixture;

[0068] Step 2: Add the mixture to a high-temperature melting machine for melting, extrusion, cooling, and curing to obtain corrosion-resistant polypropylene edge sealing strip material.

[0069] Example 4: This example discloses a method for preparing a corrosion resistant agent, including the following steps:

[0070] Q1: Add 1.1g of 2,6-dichlorobenzonitrile, 0.7g of 1,2,4-triazole and 1.14g of anhydrous potassium carbonate to a container containing 11mL of N,N-dimethylformamide, heat at 90℃ for 12h, filter under reduced pressure after the reaction is complete, and repeat the operation 3 times to obtain intermediate 1;

[0071] Q2: Add 0.6g of intermediate 1 to a container, then add 13g of sulfuric acid solution with a volume fraction of 80vt%, heat at 100℃ for 10h, after the reaction is complete, add distilled water, adjust pH=7, filter under reduced pressure, extract, dry and distill under reduced pressure to obtain intermediate 2;

[0072] Q3: Add 0.55g of intermediate 2 to a container placed in an ice bath, add 22g of sulfuric acid solution with a volume fraction of 80vt%, and wait for the temperature of the reaction solution to drop to 8℃. Add 1.67mL of distilled water containing 0.51g of sodium nitrite dropwise. After the addition is complete, continue the reaction for 1h, then raise the temperature to 100℃ and react for 3h. After the reaction is complete, add distilled water for extraction, dry, and distill under reduced pressure to obtain intermediate 3.

[0073] Q4: Add 0.55g of intermediate 3 to a container with 22mL of toluene and a reflux and gas collection device. Under 110℃, slowly add 0.65g of thionyl chloride and react for 3h. After negative pressure treatment, add 35mL of toluene and then add 0.45g of p-chloroaniline. Heat at 85℃ for 6h. During the reaction, add 1.05mL of triethylamine dropwise. After the reaction is complete, wash with saturated sodium chloride, allow to stand and separate into layers, wash the organic phase with distilled water at 40℃, dry, filter, and evaporate to dryness under negative pressure to obtain the corrosion resistant agent.

[0074] This embodiment discloses a method for preparing a composite flame retardant, including the following steps:

[0075] S1: Add 22g of 3-glycidyl etheroxypropyltrimethoxysilane, 29.27g of diphenylsilanediol and 0.1g of barium hydroxide to a container, stir and mix evenly, then introduce nitrogen gas and heat at 85°C for 8 hours. After the reaction is completed, dry under vacuum at 65°C for 4 hours to obtain a pale yellow substance.

[0076] S2: Add 5.5g of pale yellow substance, 1.1g of boric acid and 1.1mL of anhydrous ethanol to a container, stir for 15min, heat to 180℃, reflux at 700rpm for 8h, filter under reduced pressure to obtain a prepolymer, place the prepolymer in a vacuum oven at 85℃ and -2500kPa for 24h to obtain a composite flame retardant.

[0077] This embodiment discloses a corrosion-resistant polypropylene edge banding material, which is composed of the following components in parts by weight: 55 parts polypropylene, 3 parts antioxidant 1010, 4 parts corrosion resistant agent, 2.5 parts composite flame retardant, 10 parts calcium carbonate, and 2.5 parts dye.

[0078] This embodiment discloses a method for preparing a corrosion-resistant polypropylene edge banding material, including the following steps:

[0079] Step 1: Add polypropylene, antioxidant 1010, corrosion retardant, composite flame retardant, calcium carbonate and fuel to a mixing tank, stir and mix evenly to obtain a mixture;

[0080] Step 2: Add the mixture to a high-temperature melting machine for melting, extrusion, cooling, and curing to obtain corrosion-resistant polypropylene edge sealing strip material.

[0081] Example 5: This example discloses a method for preparing a corrosion resistant agent, including the following steps:

[0082] Q1: Add 1.4g of 2,6-dichlorobenzonitrile, 0.8g of 1,2,4-triazole and 1.47g of anhydrous potassium carbonate to a container containing 14mL of N,N-dimethylformamide, heat at 90℃ for 12h, filter under reduced pressure after the reaction is complete, and repeat the operation 3 times to obtain intermediate 1;

[0083] Q2: Add 0.8g of intermediate 1 to a container, then add 17g of sulfuric acid solution with a volume fraction of 80vt%, heat at 100℃ for 10h, after the reaction is complete, add distilled water, adjust pH=7, filter under reduced pressure, extract, dry and distill under reduced pressure to obtain intermediate 2;

[0084] Q3: Add 0.72g of intermediate 2 to a container placed in an ice bath, add 28g of sulfuric acid solution with a volume fraction of 80vt%, and wait for the temperature of the reaction solution to drop to 8℃. Add 2.03mL of distilled water containing 0.63g of sodium nitrite dropwise. After the addition is complete, continue the reaction for 1h, then raise the temperature to 100℃ and react for 3h. After the reaction is complete, add distilled water for extraction, dry, and distill under reduced pressure to obtain intermediate 3.

[0085] Q4: Add 0.65g of intermediate 3 to a container with 27mL of toluene and a reflux and gas collection device. Under 110℃, slowly add 0.75g of thionyl chloride and react for 3h. After negative pressure treatment, add 40mL of toluene and then add 0.55g of p-chloroaniline. Heat at 85℃ for 6h. During the reaction, add 1.15mL of triethylamine dropwise. After the reaction is complete, wash with saturated sodium chloride, allow to stand and separate into layers, wash the organic phase with distilled water at 40℃, dry, filter, and evaporate to dryness under negative pressure to obtain the corrosion resistant agent.

[0086] This embodiment discloses a method for preparing a composite flame retardant, including the following steps:

[0087] S1: Add 23g of 3-glycidyl etheroxypropyltrimethoxysilane, 34.08g of diphenylsilanediol and 0.12g of barium hydroxide to a container, stir and mix evenly, then introduce nitrogen gas and heat at 85°C for 8 hours. After the reaction is completed, dry under vacuum at 65°C for 4 hours to obtain a pale yellow substance.

[0088] S2: Add 6.5g of pale yellow substance, 1.4g of boric acid and 1.4mL of anhydrous ethanol to a container, stir for 15min, heat to 180℃, reflux at 700rpm for 8h, filter under reduced pressure to obtain a prepolymer, place the prepolymer in a vacuum oven at 85℃ and -2500kPa for 24h to obtain a composite flame retardant.

[0089] This embodiment discloses a corrosion-resistant polypropylene edge banding material, which is composed of the following components in parts by weight: 70 parts polypropylene, 4 parts antioxidant 1010, 5 parts corrosion resistant agent, 3.5 parts composite flame retardant, 14 parts calcium carbonate, and 3.5 parts dye.

[0090] This embodiment discloses a method for preparing a corrosion-resistant polypropylene edge banding material, including the following steps:

[0091] Step 1: Add polypropylene, antioxidant 1010, corrosion retardant, composite flame retardant, calcium carbonate and fuel to a mixing tank, stir and mix evenly to obtain a mixture;

[0092] Step 2: Add the mixture to a high-temperature melting machine for melting, extrusion, cooling, and curing to obtain corrosion-resistant polypropylene edge sealing strip material.

[0093] Comparative Example 1: Compared with Example 1, Comparative Example 1 did not add 2,6-dichlorobenzonitrile during the preparation of the corrosion resistant agent, and all other conditions remained unchanged.

[0094] Comparative Example 2: Compared with Example 1, Comparative Example 2 did not add 3-glycidyl etheroxypropyltrimethoxysilane during the preparation of the composite flame retardant, and all other conditions remained unchanged.

[0095] Comparative Example 3: Compared with Example 1, Comparative Example 3 did not add corrosion resistant agent during the preparation of corrosion resistant polypropylene edge banding material, and all other conditions remained unchanged.

[0096] Comparative Example 4: Compared with Example 1, Comparative Example 4 did not add composite flame retardant during the preparation of corrosion-resistant polypropylene edge banding material, and all other conditions remained unchanged.

[0097] Experimental Example: The polypropylene edge sealing strips prepared in Examples 1-5 and Comparative Examples 1-4 were subjected to performance tests. The prepared samples were placed in 40wt% sodium hydroxide solution and 50vt% hydrochloric acid solution, respectively, and placed in a constant temperature and humidity chamber for 90 days. The mass of the samples before and after the experiment was weighed, and the percentage change in weight was calculated. The heat resistance of the samples was tested according to ISO-75-2-2013, and the flame retardant properties of the samples were tested according to GB / T 2406.2-2009. The test results are shown in Table 1.

[0098] Table 1

[0099]

[0100] As shown in Table 1, the polypropylene edge banding materials prepared in Examples 1-5 of this invention exhibit excellent corrosion resistance, heat resistance, and flame retardancy. A comparison between Comparative Example 1 and Examples 1-5 shows that adding 2,6-dichlorobenzonitrile effectively improves the corrosion resistance and heat resistance of the polypropylene edge banding materials. A comparison between Comparative Example 2 and Examples 1-5 shows that adding 3-glycidyl etheroxypropyltrimethoxysilane effectively improves the flame retardancy of the polypropylene edge banding materials. A comparison between Comparative Example 3 and Examples 1-5 shows that adding a corrosion retardant effectively improves the corrosion resistance and heat resistance of the polypropylene edge banding materials. A comparison between Comparative Example 4 and Examples 1-5 shows that adding a composite flame retardant effectively improves the flame retardancy of the polypropylene edge banding materials.

[0101] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0102] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A corrosion resistant polypropylene edge strip material characterized by, It is composed of the following components in parts by weight: 50-75 parts polypropylene, 2-5 parts antioxidant, 3-6 parts corrosion retardant, 2-4 parts composite flame retardant, 8-15 parts calcium carbonate, and 2-4 parts dye. The corrosion retardant is prepared from 2,6-dichlorobenzonitrile, 1,2,4-triazole, sulfuric acid solution, sodium nitrite, and p-chloroaniline. The composite flame retardant is prepared from 3-glycidyl etheroxypropyltrimethoxysilane, diphenylsilanediol, barium hydroxide, and boric acid. The method for preparing the corrosion resistant agent includes the following steps: Q1: Add 2,6-dichlorobenzonitrile, 1,2,4-triazole and anhydrous potassium carbonate to a container containing N,N-dimethylformamide, heat to react, filter under reduced pressure after the reaction is complete, and repeat the operation to obtain intermediate 1; Q2: Add intermediate 1 to a container, then add sulfuric acid solution, heat to react, after the reaction is complete, add distilled water, adjust the pH, filter under reduced pressure, extract, dry and distill under reduced pressure to obtain intermediate 2; Q3: Add intermediate 2 to a container placed in an ice bath, add sulfuric acid solution, wait for the temperature of the reaction solution to drop, add distilled water containing sodium nitrite dropwise, continue the reaction after the addition is complete, then raise the temperature to react, after the reaction is complete, extract, dry, and distill under reduced pressure to obtain intermediate 3; Q4: Add intermediate 3 to a container with toluene and a reflux and gas collection device. Under heating conditions, slowly add thionyl chloride to react. Under negative pressure, add toluene and then add p-chloroaniline. Heat the reaction and add triethylamine dropwise during the reaction. After the reaction is complete, wash, let stand to separate the layers, wash the organic phase, dry, filter, and evaporate to dryness under negative pressure to obtain the corrosion resistant agent. The preparation method of the composite flame retardant includes the following steps: S1: Add 3-glycidyl etheroxypropyltrimethoxysilane, diphenylsilanediol and barium hydroxide to a container, stir and mix evenly, then introduce nitrogen gas and heat to react. After the reaction is completed, dry under vacuum to obtain a pale yellow substance. S2: Add the pale yellow substance, boric acid and anhydrous ethanol to a container, stir, heat and reflux to react, filter under reduced pressure to obtain a prepolymer, and place the prepolymer in a vacuum oven to obtain a composite flame retardant.

2. A corrosion resistant polypropylene edge strip material according to claim 1, characterized in that The antioxidant is composed of one or more of antioxidant 1010, antioxidant 1076, antioxidant 168 and antioxidant 626.

3. The corrosion-resistant polypropylene edge banding material according to claim 1, characterized in that, In Q1, the ratio of 2,6-dichlorobenzonitrile, 1,2,4-triazole, anhydrous potassium carbonate, and N,N-dimethylformamide is (1-1.5) g : (0.6-0.9) g : (1.04-1.56) g : (10-15) mL. The reaction temperature is 80-90℃, the reaction time is 10-14 h, and the operation is repeated 2-4 times. In Q2, the ratio of intermediate 1 to sulfuric acid solution is (0.5-0.9) g : (12-18) g. The volume fraction of sulfuric acid solution is 80 wt%. The reaction temperature is 90-110℃, the reaction time is 9-11 h, and the pH is adjusted to 7-8.

4. The corrosion-resistant polypropylene edge banding material according to claim 1, characterized in that, In Q3, the ratio of intermediate 2, sulfuric acid solution, sodium nitrite, and distilled water is (0.5-0.75) g : (20-30) g : (0.46-0.69) g : (1.38-2.12) mL. The volume fraction of the sulfuric acid solution is 80 wt%. The temperature is lowered to 8-10℃, and the reaction time is continued for 1-2 hours. The reaction temperature is then raised to 90-100℃, and the reaction time is 2-3 hours. Distilled water is then added for extraction. In Q4, intermediate 3, toluene, thionyl chloride, The ratio of added toluene, p-chloroaniline, and triethylamine is (0.5-0.7) g : (20-30) mL : (0.6-0.8) g : (30-45) mL : (0.4-0.6) g : (1-1.2) mL. The heating conditions are 100-110℃ and the reaction time is 2-3 h. After adding p-chloroaniline, the heating temperature is 80-85℃ and the reaction time is 4-6 h. The organic phase is washed with saturated sodium chloride and then washed with distilled water at 40-50℃.

5. The corrosion-resistant polypropylene edge banding material according to claim 1, characterized in that, In S1, the ratio of 3-glycidyl etheroxypropyltrimethoxysilane, diphenylsilanediol and barium hydroxide is (20-25) g: (27.46-35.12) g: (0.09-0.13) g, the heating reaction temperature is 80-85℃, the reaction time is 6-8 h, the vacuum drying temperature is 60-70℃, and the drying time is 3-5 h.

6. The corrosion-resistant polypropylene edge banding material according to claim 1, characterized in that, In S2, the ratio of the pale yellow substance, boric acid, and anhydrous ethanol is (5-7.5) g: (1-1.5) g: (1-1.5) mL, the stirring time is 10-15 min, the heating and reflux reaction temperature is 170-180℃, the rotation speed is 500-700 rpm, the reaction time is 6-8 h, the temperature of the vacuum oven is 80-85℃, the vacuum degree is -2500~-3000 kPa, and the time is 20-24 h.

7. A method for preparing a corrosion-resistant polypropylene edge banding material as described in any one of claims 1-6, characterized in that, Includes the following steps: Step 1: Add polypropylene, antioxidant, corrosion resistant agent, composite flame retardant, calcium carbonate and fuel to a mixing tank, stir and mix evenly to obtain a mixture; Step 2: Add the mixture to a high-temperature melting machine for melting, extrusion, cooling, and curing to obtain corrosion-resistant polypropylene edge sealing strip material.

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