A process for processing sealed and waterproof polycarbonate sheets

Abstract

The invention relates to the field of polycarbonate materials, and in particular to a processing technology for a sealed and waterproof polycarbonate plate, which is used to solve the problem that the existing polycarbonate plates are poor in sealing and waterproofing, anti-oxidation performance and high-temperature flame retardancy, and are difficult to meet increasingly improved performance requirements; the processing technology adds a performance enhancer and modified rough particles to the polycarbonate resin, thereby not only significantly improving the waterproof performance of the polycarbonate plate, but also enhancing the mechanical strength, anti-oxidation performance and flame retardancy of the polycarbonate plate, so that the polycarbonate plate exhibits excellent performance in a wide range of application scenarios, improves the environmental adaptability of the polycarbonate plate, and effectively prolongs the service life of the product.

Description

Technical Field

[0001] The invention relates to the field of polycarbonate materials, and in particular to a processing technology for a sealed and waterproof polycarbonate plate. Background Art

[0002] Polycarbonate (PC) is widely used in the fields of construction, electronics, automobiles, advertising, transportation, etc. due to its excellent properties such as high transparency, high strength, and impact resistance. However, the polycarbonate material itself lacks water resistance and easily absorbs moisture, resulting in performance degradation or even corrosion. It also has poor antioxidant properties and is prone to aging, yellowing, and performance degradation during long-term use. In addition, the polycarbonate sheet has poor temperature resistance and lacks flame retardant effects, which limits its application in many fields.

[0003] How to improve the sealing and waterproofing, anti-oxidation and high temperature flame retardant properties of traditional polycarbonate sheets, which are not good enough to meet the increasingly high performance requirements. Therefore, it is of great significance to develop a sealing and waterproof polycarbonate sheet processing technology. Summary of the invention

[0004] In order to overcome the above technical problems, the purpose of the present invention is to provide a sealed and waterproof polycarbonate board processing technology, which solves the problem that the existing polycarbonate boards have poor sealing and waterproofing, antioxidant properties and high-temperature flame retardant properties, and are difficult to meet the increasingly improved performance requirements.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A process for processing a sealed and waterproof polycarbonate sheet comprises the following steps:

[0007] Step 1: Weigh 85-95 parts of polycarbonate resin, 22-36 parts of ABS resin, 7-15 parts of light calcium carbonate, 5-9 parts of talc, 3-15 parts of performance enhancer, 1.2-6.4 parts of modified rough particles, 1-3 parts of diisobutyl phthalate, 1-5 parts of pentaerythritol stearate, 0.5-1.7 parts of magnesium stearate and 0.3-1.1 parts of paraffin wax according to weight parts;

[0008] Step 2: Add polycarbonate resin, ABS resin, light calcium carbonate, talcum powder, performance enhancer, modified rough particles, diisobutyl phthalate, pentaerythritol stearate, magnesium stearate and paraffin into a mixer and mix evenly, then melt-extrude through an extruder, and then extrude through a mold to obtain a sealed and waterproof polycarbonate board.

[0009] As a further solution of the present invention: the performance enhancer is prepared by the following steps:

[0010] Step a1: 3-tert-butyl salicylaldehyde and anhydrous ethanol are added to a three-necked flask equipped with a stirrer, a thermometer, an air guide tube and a constant pressure dropping funnel, and nitrogen is introduced for protection. The mixture is stirred for reaction for 20-30 minutes at a temperature of 25-30° C. and a stirring rate of 300-400 r / min. Then, a liquid bromine solution is added dropwise while stirring, and the dropping rate is controlled to be 1-2 drops / s. After the addition is completed, the temperature is raised to 60-65° C. and the stirring reaction is continued for 8-10 hours. After the reaction is completed, the reaction product is cooled to room temperature, and then the solvent is removed by rotary evaporation to obtain an intermediate 1;

[0011] Step a2: adding intermediate 1, melamine and anhydrous methanol into a three-necked flask equipped with a stirrer, a thermometer, an air guide tube and a reflux condenser, introducing nitrogen protection, stirring the reaction at a temperature of 25-30° C. and a stirring rate of 300-400 r / min for 15-25 min, then heating to reflux and continuing to stir the reaction for 8-10 h. After the reaction is completed, the reaction product is cooled to room temperature, and then the solvent is removed by rotary evaporation to obtain intermediate 2;

[0012] Step a3: Add intermediate 2, DOPO and anhydrous methanol into a three-necked flask equipped with a stirrer, a thermometer, an air guide tube and a reflux condenser, introduce nitrogen protection, stir and react for 30-50 minutes at a temperature of 25-30° C. and a stirring rate of 300-400 r / min, then heat to reflux and continue stirring and reacting for 3-5 hours. After the reaction is completed, the reaction product is cooled to room temperature and then centrifuged. The precipitate is placed in a vacuum drying oven and dried at a temperature of 70-75° C. for 3-5 hours to obtain intermediate 3;

[0013] Step a4: Add intermediate 3, hexafluoroisopropanol, triethylamine and anhydrous ether to a three-necked flask equipped with a stirrer, a thermometer and an air duct, introduce nitrogen protection, stir the reaction at a temperature of 0-5°C and a stirring rate of 300-400r / min for 1-1.5h, then raise the temperature to 40-45°C and continue stirring the reaction for 8-10h. After the reaction is completed, the reaction product is cooled to room temperature, and then the solvent is removed by rotary evaporation to obtain a performance enhancer.

[0014] As a further solution of the present invention: the usage ratio of the 3-tert-butyl salicylaldehyde, anhydrous ethanol and liquid bromine solution in step a1 is 5 g: 40-50 mL: 20-25 mL.

[0015] As a further solution of the present invention: the liquid bromine solution in step a1 is a solution formed by dissolving liquid bromine in anhydrous ethanol at a ratio of 1.8-2.2 g:10 mL.

[0016] As a further solution of the present invention: the usage ratio of the intermediate 1, melamine and anhydrous methanol in step a2 is 30 mmol:10 mmol:50-60 mL.

[0017] As a further solution of the present invention: the usage ratio of the intermediate 2, DOPO and anhydrous methanol in step a3 is 10 mmol:33-36 mmol:70-80 mL.

[0018] As a further solution of the present invention: the usage ratio of the intermediate 3, hexafluoroisopropanol, triethylamine and anhydrous ether in step a4 is 10 mmol: 33-35 mmol: 35-40 mmol: 80-100 mL.

[0019] As a further solution of the present invention: the modified rough particles are prepared by the following steps:

[0020] Add silicon dioxide, 1H, 1H, 2H, 2H-perfluoroheptadecantrimethyloxysilane, ammonia water, deionized water and anhydrous ethanol into a three-necked flask equipped with a stirrer, a thermometer and an air guide tube, introduce nitrogen protection, stir and react for 20-30 minutes at a temperature of 25-30° C. and a stirring rate of 300-400 r / min, then heat to 80-85° C. and continue stirring and reacting for 5-6 hours. After the reaction is completed, cool the reaction product to room temperature, then centrifuge, wash the precipitate with an ethanol solution for 2-3 times, then place it in a vacuum drying oven, and dry it at a temperature of 60-65° C. for 5-6 hours to obtain modified rough particles;

[0021] As a further solution of the present invention: the amount ratio of the silicon dioxide, 1H, 1H, 2H, 2H-perfluoroheptadecantrimethylsilane, ammonia water, deionized water and anhydrous ethanol is 5g: 1.5-4.5g: 3-4g: 3-5mL: 20-25mL.

[0022] As a further solution of the present invention: the mass fraction of the ammonia water is 20-25%.

[0023] As a further solution of the present invention: the volume fraction of the ethanol solution is 40-50%.

[0024] Beneficial effects of the present invention:

[0025] The invention discloses a sealing and waterproof polycarbonate board processing technology, which comprises the following steps: adding polycarbonate resin, ABS resin, light calcium carbonate, talcum powder, performance enhancer, modified rough particles, diisobutyl phthalate, pentaerythritol stearate, magnesium stearate and paraffin into a mixer and mixing them evenly, then melting and extruding them through an extruder, and then extruding and molding them through a mold to obtain a sealing and waterproof polycarbonate board; the processing technology not only significantly improves the waterproof performance of the polycarbonate board by adding the performance enhancer and the modified rough particles into the polycarbonate resin, but also enhances the mechanical strength, antioxidant performance and flame retardant performance of the polycarbonate board, so that the polycarbonate board exhibits excellent performance in a wide range of application scenarios, improves the environmental adaptability of the polycarbonate board, and effectively prolongs the service life of the product;

[0026] In the process of preparing a sealed and waterproof polycarbonate plate, a performance enhancer is first prepared. First, 3-tert-butyl salicylaldehyde and liquid bromine are reacted to introduce a bromine atom into the benzene ring of 3-tert-butyl salicylaldehyde to obtain an intermediate 1. Then, the intermediate 1 and melamine are reacted, and the aldehyde group on the intermediate 1 reacts with the amino group on the melamine to form a Schiff base structure to obtain an intermediate 2. Then, the intermediate 2 and DOPO are reacted, and the C=N on the intermediate 2 reacts with the PH on the DOPO to introduce organic phosphorus to obtain an intermediate 3. Then, the intermediate 3 and hexafluoroisopropanol are reacted, and the bromine atom on the intermediate 3 reacts with the amino group on the hexafluoroisopropanol. The hydroxyl groups react to introduce a large number of CF bonds to obtain a performance enhancer; the molecular structure of the performance enhancer contains a plurality of hindered phenol groups, which gives it excellent anti-oxidation and weathering properties, and the molecular structure of the performance enhancer contains a large number of CF bonds, which gives it excellent hydrophobic properties, significantly enhancing the sealing and waterproof properties of the polycarbonate sheet, effectively preventing water penetration, and the molecular structure of the performance enhancer contains a large number of cyclic structures, organic phosphorus and organic nitrogen, which gives it excellent high-temperature stability, and has the flame retardant effect of phosphorus-nitrogen flame retardants, so that the polycarbonate sheet has better flame retardancy and high temperature resistance, and broadens its application field;

[0027] In the process of preparing the sealed and waterproof polycarbonate board, a modified rough particle is also prepared. Silica is modified by using 1H, 1H, 2H, 2H-perfluoroheptadecantrimethyloxysilane. The siloxane on the 1H, 1H, 2H, 2H-perfluoroheptadecantrimethyloxysilane is hydrolyzed to form silanols that are grafted onto the surface of the silica particles. At the same time, a large number of fluorine atoms and silicon atoms are introduced to obtain modified rough particles. The modified silica has excellent dispersibility, so that it can be evenly distributed in the polycarbonate board, which greatly improves the mechanical properties, wear resistance and ultraviolet absorption performance of the polycarbonate board. Moreover, the addition of the modified rough particles can construct geometric roughness, and can form a super-hydrophobic surface under the synergistic effect of the performance enhancer, thereby further improving the sealing and waterproof properties of the polycarbonate board. DETAILED DESCRIPTION

[0028] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Embodiment 1:

[0030] This embodiment is a process for processing a sealed and waterproof polycarbonate plate, comprising the following steps:

[0031] Step S1: 5 g of 3-tert-butyl salicylaldehyde and 40 mL of anhydrous ethanol were added to a three-necked flask equipped with a stirrer, a thermometer, an air guide tube and a constant pressure dropping funnel, and nitrogen was introduced for protection. The mixture was stirred for reaction at a temperature of 25° C. and a stirring rate of 300 r / min for 20 min. Then, 20 mL of liquid bromine was added dropwise while stirring. The liquid bromine solution formed by dissolving 1.8 g:10 mL of liquid bromine in anhydrous ethanol was added dropwise. The dropping rate was controlled to be 1 drop / s. After the dropwise addition was completed, the temperature was raised to 60° C. and the stirring reaction was continued for 8 h. After the reaction was completed, the reaction product was cooled to room temperature, and then the solvent was removed by rotary evaporation to obtain intermediate 1;

[0032] Step S2: 30 mmol of intermediate 1, 10 mmol of melamine and 50 mL of anhydrous methanol were added to a three-necked flask equipped with a stirrer, a thermometer, a gas guide tube and a reflux condenser, and nitrogen was introduced for protection. The mixture was stirred for reaction at a temperature of 25° C. and a stirring rate of 300 r / min for 15 min, and then the temperature was raised to reflux and the stirring reaction was continued for 8 h. After the reaction was completed, the reaction product was cooled to room temperature, and then the solvent was removed by rotary evaporation to obtain intermediate 2;

[0033] Step S3: 10 mmol of intermediate 2, 33 mmol of DOPO and 70 mL of anhydrous methanol were added to a three-necked flask equipped with a stirrer, a thermometer, a gas guide tube and a reflux condenser, and nitrogen was introduced for protection. The mixture was stirred at 25° C. and a stirring rate of 300 r / min for 30 min, and then the temperature was raised to reflux and the stirring reaction was continued for 3 h. After the reaction was completed, the reaction product was cooled to room temperature and then centrifuged. The precipitate was placed in a vacuum drying oven and dried at 70° C. for 3 h to obtain intermediate 3;

[0034] Step S4: 10 mmol of intermediate 3, 33 mmol of hexafluoroisopropanol, 35 mmol of triethylamine and 80 mL of anhydrous ether were added to a three-necked flask equipped with a stirrer, a thermometer and a gas guide tube, and nitrogen was introduced for protection. The mixture was stirred at 0° C. and a stirring rate of 300 r / min for 1 h, and then the mixture was heated to 40° C. and stirred for 8 h. After the reaction was completed, the reaction product was cooled to room temperature, and then the solvent was removed by rotary evaporation to obtain a performance enhancer;

[0035] Step S5: 5 g of silicon dioxide, 1.5 g of 1 H, 1 H, 2 H, 2 H-perfluoroheptadecantrimethyloxysilane, 3 g of 20% ammonia water, 3 mL of deionized water and 20 mL of anhydrous ethanol were added to a three-necked flask equipped with a stirrer, a thermometer and an air duct, and nitrogen was introduced for protection. The mixture was stirred for reaction at a temperature of 25° C. and a stirring rate of 300 r / min for 20 min, and then the mixture was heated to 80° C. and stirred for reaction for 5 h. After the reaction was completed, the reaction product was cooled to room temperature and then centrifuged. The precipitate was washed twice with a 40% ethanol solution by volume, and then placed in a vacuum drying oven and dried at a temperature of 60° C. for 5 h to obtain modified rough particles.

[0036] Step S6: 85 parts of polycarbonate resin, 22 parts of ABS resin, 7 parts of light calcium carbonate, 5 parts of talc, 3 parts of performance enhancer, 1.2 parts of modified rough particles, 1 part of diisobutyl phthalate, 1 part of pentaerythritol stearate, 0.5 parts of magnesium stearate and 0.3 parts of paraffin were weighed according to weight parts;

[0037] Step S7: Add polycarbonate resin, ABS resin, light calcium carbonate, talcum powder, performance enhancer, modified rough particles, diisobutyl phthalate, pentaerythritol stearate, magnesium stearate and paraffin into a mixer and mix evenly, then melt-extrude through an extruder, and then extrude through a mold to obtain a sealed and waterproof polycarbonate board.

[0038] Embodiment 2:

[0039] This embodiment is a process for processing a sealed and waterproof polycarbonate plate, comprising the following steps:

[0040] Step S1: 5 g of 3-tert-butyl salicylaldehyde and 45 mL of anhydrous ethanol were added to a three-necked flask equipped with a stirrer, a thermometer, an air guide tube and a constant pressure dropping funnel, and nitrogen was introduced for protection. The reaction was stirred for 25 min at a temperature of 28° C. and a stirring rate of 350 r / min. Then, 22 mL of liquid bromine was added dropwise while stirring. The liquid bromine solution formed by dissolving 2 g:10 mL of liquid bromine in anhydrous ethanol was added dropwise. The dropping rate was controlled to be 1 drop / s. After the dropwise addition was completed, the temperature was raised to 62° C. and the stirring reaction was continued for 9 h. After the reaction was completed, the reaction product was cooled to room temperature, and then the solvent was removed by rotary evaporation to obtain intermediate 1;

[0041] Step S2: 30 mmol of intermediate 1, 10 mmol of melamine and 55 mL of anhydrous methanol were added to a three-necked flask equipped with a stirrer, a thermometer, a gas guide tube and a reflux condenser, and nitrogen was introduced for protection. The mixture was stirred for reaction at a temperature of 28° C. and a stirring rate of 350 r / min for 20 min, and then the temperature was raised to reflux and the stirring reaction was continued for 9 h. After the reaction was completed, the reaction product was cooled to room temperature, and then the solvent was removed by rotary evaporation to obtain intermediate 2;

[0042] Step S3: 10 mmol of intermediate 2, 35 mmol of DOPO and 75 mL of anhydrous methanol were added to a three-necked flask equipped with a stirrer, a thermometer, a gas guide tube and a reflux condenser, and nitrogen was introduced for protection. The mixture was stirred at 28° C. and a stirring rate of 350 r / min for 40 min, and then the temperature was raised to reflux and the stirring reaction was continued for 4 h. After the reaction was completed, the reaction product was cooled to room temperature and then centrifuged. The precipitate was placed in a vacuum drying oven and dried at 72° C. for 4 h to obtain intermediate 3;

[0043] Step S4: 10 mmol of intermediate 3, 34 mmol of hexafluoroisopropanol, 38 mmol of triethylamine and 90 mL of anhydrous ether were added to a three-necked flask equipped with a stirrer, a thermometer and a gas guide tube, and nitrogen was introduced for protection. The mixture was stirred at a temperature of 3° C. and a stirring rate of 350 r / min for 1.2 h, and then the mixture was heated to 42° C. and stirred for 9 h. After the reaction was completed, the reaction product was cooled to room temperature, and then the solvent was removed by rotary evaporation to obtain a performance enhancer;

[0044] Step S5: 5 g of silicon dioxide, 3 g of 1 H, 1H, 2H, 2H-perfluoroheptadecantrimethylsilane, 3.5 g of 22% ammonia water, 4 mL of deionized water and 22 mL of anhydrous ethanol were added to a three-necked flask equipped with a stirrer, a thermometer and an air duct, and nitrogen was introduced for protection. The mixture was stirred at 28° C. and a stirring rate of 350 r / min for 25 min, and then the mixture was heated to 82° C. and stirred for 5.5 h. After the reaction was completed, the reaction product was cooled to room temperature and then centrifuged. The precipitate was washed twice with a 42% ethanol solution by volume, and then placed in a vacuum drying oven and dried at 62° C. for 5.5 h to obtain modified rough particles.

[0045] Step S6: weighing 90 parts of polycarbonate resin, 29 parts of ABS resin, 11 parts of light calcium carbonate, 7 parts of talc, 9 parts of performance enhancer, 3.8 parts of modified rough particles, 2 parts of diisobutyl phthalate, 3 parts of pentaerythritol stearate, 1.1 parts of magnesium stearate and 0.7 parts of paraffin wax according to weight parts;

[0046] Step S7: Add polycarbonate resin, ABS resin, light calcium carbonate, talcum powder, performance enhancer, modified rough particles, diisobutyl phthalate, pentaerythritol stearate, magnesium stearate and paraffin into a mixer and mix evenly, then melt-extrude through an extruder, and then extrude through a mold to obtain a sealed and waterproof polycarbonate board.

[0047] Embodiment 3:

[0048] This embodiment is a process for processing a sealed and waterproof polycarbonate plate, comprising the following steps:

[0049] Step S1: 5 g of 3-tert-butyl salicylaldehyde and 50 mL of anhydrous ethanol were added to a three-necked flask equipped with a stirrer, a thermometer, an air guide tube and a constant pressure dropping funnel, and nitrogen was introduced for protection. The mixture was stirred for reaction at a temperature of 30° C. and a stirring rate of 400 r / min for 30 min. Then, 25 mL of liquid bromine was added dropwise while stirring. The liquid bromine solution formed by dissolving 2.2 g:10 mL of liquid bromine in anhydrous ethanol was added dropwise. The dropping rate was controlled to be 2 drops / s. After the addition was completed, the temperature was raised to 65° C. and the stirring reaction was continued for 10 h. After the reaction was completed, the reaction product was cooled to room temperature, and then the solvent was removed by rotary evaporation to obtain intermediate 1;

[0050] Step S2: 30 mmol of intermediate 1, 10 mmol of melamine and 60 mL of anhydrous methanol were added to a three-necked flask equipped with a stirrer, a thermometer, a gas guide tube and a reflux condenser, and nitrogen was introduced for protection. The mixture was stirred at a temperature of 30° C. and a stirring rate of 400 r / min for 25 min, and then the temperature was raised to reflux and the stirring reaction was continued for 10 h. After the reaction was completed, the reaction product was cooled to room temperature, and then the solvent was removed by rotary evaporation to obtain intermediate 2;

[0051] Step S3: 10 mmol of intermediate 2, 36 mmol of DOPO and 80 mL of anhydrous methanol were added to a three-necked flask equipped with a stirrer, a thermometer, a gas guide tube and a reflux condenser, and nitrogen was introduced for protection. The mixture was stirred at 30° C. and a stirring rate of 400 r / min for 50 min, and then the temperature was raised to reflux and the stirring reaction was continued for 5 h. After the reaction was completed, the reaction product was cooled to room temperature and then centrifuged. The precipitate was placed in a vacuum drying oven and dried at 75° C. for 5 h to obtain intermediate 3;

[0052] Step S4: 10 mmol of intermediate 3, 35 mmol of hexafluoroisopropanol, 40 mmol of triethylamine and 100 mL of anhydrous ether were added to a three-necked flask equipped with a stirrer, a thermometer and a gas guide tube, and nitrogen was introduced for protection. The mixture was stirred at a temperature of 5° C. and a stirring rate of 400 r / min for 1.5 h, and then the temperature was raised to 45° C. and the stirring reaction was continued for 10 h. After the reaction was completed, the reaction product was cooled to room temperature, and then the solvent was removed by rotary evaporation to obtain a performance enhancer;

[0053] Step S5: 5 g of silicon dioxide, 4.5 g of 1 H, 1 H, 2 H, 2 H-perfluoroheptadecantrimethyloxysilane, 4 g of 25% ammonia water, 5 mL of deionized water and 25 mL of anhydrous ethanol were added to a three-necked flask equipped with a stirrer, a thermometer and an air guide tube, and nitrogen was introduced for protection. The mixture was stirred for reaction at a temperature of 30° C. and a stirring rate of 400 r / min for 30 min, and then the mixture was heated to 85° C. and continued to stir for reaction for 6 h. After the reaction was completed, the reaction product was cooled to room temperature and then centrifuged. The precipitate was washed 3 times with a 50% ethanol solution by volume, and then placed in a vacuum drying oven and dried at a temperature of 65° C. for 6 h to obtain modified rough particles.

[0054] Step S6: weighing 95 parts of polycarbonate resin, 36 parts of ABS resin, 15 parts of light calcium carbonate, 9 parts of talc, 15 parts of performance enhancer, 6.4 parts of modified rough particles, 3 parts of diisobutyl phthalate, 5 parts of pentaerythritol stearate, 1.7 parts of magnesium stearate and 1.1 parts of paraffin wax according to weight parts;

[0055] Step S7: Add polycarbonate resin, ABS resin, light calcium carbonate, talcum powder, performance enhancer, modified rough particles, diisobutyl phthalate, pentaerythritol stearate, magnesium stearate and paraffin into a mixer and mix evenly, then melt-extrude through an extruder, and then extrude through a mold to obtain a sealed and waterproof polycarbonate board.

[0056] Comparative Example 1:

[0057] This comparative example is a process for processing a sealed and waterproof polycarbonate plate, comprising the following steps:

[0058] Step S1: weighing 95 parts of polycarbonate resin, 36 parts of ABS resin, 15 parts of light calcium carbonate, 9 parts of talc, 3 parts of diisobutyl phthalate, 5 parts of pentaerythritol stearate, 1.7 parts of magnesium stearate and 1.1 parts of paraffin wax according to weight parts;

[0059] Step S2: adding polycarbonate resin, ABS resin, light calcium carbonate, talcum powder, diisobutyl phthalate, pentaerythritol stearate, magnesium stearate and paraffin into a mixer and mixing them evenly, then melt-extruded through an extruder, and then extruded through a mold to obtain a sealed and waterproof polycarbonate board.

[0060] Comparative Example 2:

[0061] This comparative example is a process for processing a sealed and waterproof polycarbonate plate, comprising the following steps:

[0062] Step S1: 5 g of 3-tert-butyl salicylaldehyde and 50 mL of anhydrous ethanol were added to a three-necked flask equipped with a stirrer, a thermometer, an air guide tube and a constant pressure dropping funnel, and nitrogen was introduced for protection. The mixture was stirred for reaction at a temperature of 30° C. and a stirring rate of 400 r / min for 30 min. Then, 25 mL of liquid bromine was added dropwise while stirring. The liquid bromine solution formed by dissolving 2.2 g:10 mL of liquid bromine in anhydrous ethanol was added dropwise. The dropping rate was controlled to be 2 drops / s. After the addition was completed, the temperature was raised to 65° C. and the stirring reaction was continued for 10 h. After the reaction was completed, the reaction product was cooled to room temperature, and then the solvent was removed by rotary evaporation to obtain intermediate 1;

[0063] Step S2: 30 mmol of intermediate 1, 10 mmol of melamine and 60 mL of anhydrous methanol were added to a three-necked flask equipped with a stirrer, a thermometer, a gas guide tube and a reflux condenser, and nitrogen was introduced for protection. The mixture was stirred at a temperature of 30° C. and a stirring rate of 400 r / min for 25 min, and then the temperature was raised to reflux and the stirring reaction was continued for 10 h. After the reaction was completed, the reaction product was cooled to room temperature, and then the solvent was removed by rotary evaporation to obtain intermediate 2;

[0064] Step S3: 10 mmol of intermediate 2, 36 mmol of DOPO and 80 mL of anhydrous methanol were added to a three-necked flask equipped with a stirrer, a thermometer, a gas guide tube and a reflux condenser, and nitrogen was introduced for protection. The mixture was stirred at 30° C. and a stirring rate of 400 r / min for 50 min, and then the temperature was raised to reflux and the stirring reaction was continued for 5 h. After the reaction was completed, the reaction product was cooled to room temperature and then centrifuged. The precipitate was placed in a vacuum drying oven and dried at 75° C. for 5 h to obtain intermediate 3;

[0065] Step S4: 10 mmol of intermediate 3, 35 mmol of hexafluoroisopropanol, 40 mmol of triethylamine and 100 mL of anhydrous ether were added to a three-necked flask equipped with a stirrer, a thermometer and a gas guide tube, and nitrogen was introduced for protection. The mixture was stirred at a temperature of 5° C. and a stirring rate of 400 r / min for 1.5 h, and then the temperature was raised to 45° C. and the stirring reaction was continued for 10 h. After the reaction was completed, the reaction product was cooled to room temperature, and then the solvent was removed by rotary evaporation to obtain a performance enhancer;

[0066] Step S5: weighing 95 parts of polycarbonate resin, 36 parts of ABS resin, 15 parts of light calcium carbonate, 9 parts of talc, 15 parts of performance enhancer, 3 parts of diisobutyl phthalate, 5 parts of pentaerythritol stearate, 1.7 parts of magnesium stearate and 1.1 parts of paraffin wax according to weight parts;

[0067] Step S6: adding polycarbonate resin, ABS resin, light calcium carbonate, talc, performance enhancer, diisobutyl phthalate, pentaerythritol stearate, magnesium stearate and paraffin into a mixer and mixing evenly, then melt-extruded through an extruder, and then extruded through a mold to obtain a sealed and waterproof polycarbonate board.

[0068] Comparative Example 3:

[0069] This comparative example is a process for processing a sealed and waterproof polycarbonate plate, comprising the following steps:

[0070] Step S1: 5 g of silicon dioxide, 4.5 g of 1 H, 1 H, 2 H, 2 H-perfluoroheptadecanetrimethyloxysilane, 4 g of 25% ammonia water, 5 mL of deionized water and 25 mL of anhydrous ethanol were added to a three-necked flask equipped with a stirrer, a thermometer and an air duct, and nitrogen was introduced for protection. The mixture was stirred for reaction at a temperature of 30° C. and a stirring rate of 400 r / min for 30 min, and then the mixture was heated to 85° C. and stirred for reaction for 6 h. After the reaction was completed, the reaction product was cooled to room temperature and then centrifuged. The precipitate was washed 3 times with a 50% ethanol solution by volume, and then placed in a vacuum drying oven and dried at a temperature of 65° C. for 6 h to obtain modified rough particles.

[0071] Step S2: Weigh 95 parts of polycarbonate resin, 36 parts of ABS resin, 15 parts of light calcium carbonate, 9 parts of talc, 6.4 parts of modified rough particles, 3 parts of diisobutyl phthalate, 5 parts of pentaerythritol stearate, 1.7 parts of magnesium stearate and 1.1 parts of paraffin wax according to weight parts;

[0072] Step S3: adding polycarbonate resin, ABS resin, light calcium carbonate, talcum powder, modified rough particles, diisobutyl phthalate, pentaerythritol stearate, magnesium stearate and paraffin into a mixer and mixing evenly, then melt-extruded through an extruder, and then extruded through a mold to obtain a sealed and waterproof polycarbonate board.

[0073] The performance of the sealed and waterproof polycarbonate plates of Examples 1-3 and Comparative Examples 1-3 was tested, and the test results are as follows:

[0074]

[0075] Referring to the data in the above table, based on the comparison between Examples 1-3 and Comparative Examples 1-3, it can be known that the performance enhancer and the modified rough particles can significantly enhance the mechanical properties, flame retardant properties and waterproof properties of the polycarbonate board.

[0076] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0077] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. A process for processing a sealed and waterproof polycarbonate sheet, characterized in that: The following steps are involved: Step 1: Weigh 85-95 parts of polycarbonate resin, 22-36 parts of ABS resin, 7-15 parts of light calcium carbonate, 5-9 parts of talc, 3-15 parts of performance enhancer, 1.2-6.4 parts of modified rough particles, 1-3 parts of diisobutyl phthalate, 1-5 parts of pentaerythritol stearate, 0.5-1.7 parts of magnesium stearate and 0.3-1.1 parts of paraffin wax according to weight parts; Step 2: adding polycarbonate resin, ABS resin, light calcium carbonate, talcum powder, performance enhancer, modified rough particles, diisobutyl phthalate, pentaerythritol stearate, magnesium stearate and paraffin into a mixer and mixing them evenly, then melting and extruding them through an extruder, and then extruding and molding them through a mold to obtain a sealed and waterproof polycarbonate board; Wherein, the performance enhancer is prepared by the following steps: Step a1: 3-tert-butyl salicylaldehyde and anhydrous ethanol are added to a three-necked flask equipped with a stirrer, a thermometer, an air guide tube and a constant pressure dropping funnel, and nitrogen is introduced for protection. The mixture is stirred for reaction for 20-30 minutes at a temperature of 25-30° C. and a stirring rate of 300-400 r / min. Then, a liquid bromine solution is added dropwise while stirring, and the dropping rate is controlled to be 1-2 drops / s. After the addition is completed, the temperature is raised to 60-65° C. and the stirring reaction is continued for 8-10 hours. After the reaction is completed, the reaction product is cooled to room temperature, and then the solvent is removed by rotary evaporation to obtain an intermediate 1; Step a2: adding intermediate 1, melamine and anhydrous methanol into a three-necked flask equipped with a stirrer, a thermometer, an air guide tube and a reflux condenser, introducing nitrogen protection, stirring the reaction at a temperature of 25-30° C. and a stirring rate of 300-400 r / min for 15-25 min, then heating to reflux and continuing to stir the reaction for 8-10 h. After the reaction is completed, the reaction product is cooled to room temperature, and then the solvent is removed by rotary evaporation to obtain intermediate 2; Step a3: Add intermediate 2, DOPO and anhydrous methanol into a three-necked flask equipped with a stirrer, a thermometer, an air guide tube and a reflux condenser, introduce nitrogen protection, stir and react for 30-50 minutes at a temperature of 25-30° C. and a stirring rate of 300-400 r / min, then heat to reflux and continue stirring and reacting for 3-5 hours. After the reaction is completed, the reaction product is cooled to room temperature and then centrifuged. The precipitate is placed in a vacuum drying oven and dried at a temperature of 70-75° C. for 3-5 hours to obtain intermediate 3; Step a4: Add intermediate 3, hexafluoroisopropanol, triethylamine and anhydrous ether to a three-necked flask equipped with a stirrer, a thermometer and a gas guide tube, introduce nitrogen protection, stir the reaction at a temperature of 0-5°C and a stirring rate of 300-400r / min for 1-1.5h, then heat to 40-45°C and continue stirring the reaction for 8-10h. After the reaction is completed, cool the reaction product to room temperature, and then remove the solvent by rotary evaporation to obtain a performance enhancer; The modified rough particles are prepared by the following steps: Silica, 1H, 1H, 2H, 2H-perfluoroheptadecantrimethyloxysilane, ammonia water, deionized water and anhydrous ethanol are added to a three-necked flask equipped with a stirrer, a thermometer and an air guide tube, and nitrogen is introduced for protection. The mixture is stirred for reaction for 20-30 minutes at a temperature of 25-30° C. and a stirring rate of 300-400 r / min, and then the mixture is heated to 80-85° C. and the stirring reaction is continued for 5-6 hours. After the reaction is completed, the reaction product is cooled to room temperature and then centrifuged. The precipitate is washed with an ethanol solution for 2-3 times, and then placed in a vacuum drying oven and dried at a temperature of 60-65° C. for 5-6 hours to obtain modified rough particles.

2. A process for processing a sealed and waterproof polycarbonate board according to claim 1, characterized in that: The usage ratio of the 3-tert-butyl salicylaldehyde, anhydrous ethanol and liquid bromine solution in step a1 is 5g:40-50mL:20-25mL.

3. A process for processing a sealed and waterproof polycarbonate board according to claim 1, characterized in that: The liquid bromine solution in step a1 is a solution formed by dissolving liquid bromine in anhydrous ethanol at a ratio of 1.8-2.2 g:10 mL.

4. A process for processing a sealed and waterproof polycarbonate board according to claim 1, characterized in that: The usage ratio of the intermediate 1, melamine and anhydrous methanol in step a2 is 30mmol:10mmol:50-60mL.

5. A process for processing a sealed and waterproof polycarbonate board according to claim 1, characterized in that: The usage ratio of the intermediate 2, DOPO and anhydrous methanol in step a3 is 10 mmol: 33-36 mmol: 70-80 mL.

6. A process for processing a sealed and waterproof polycarbonate board according to claim 1, characterized in that: The usage ratio of the intermediate 3, hexafluoroisopropanol, triethylamine and anhydrous ether in step a4 is 10 mmol: 33-35 mmol: 35-40 mmol: 80-100 mL.

7. A process for processing a sealed and waterproof polycarbonate board according to claim 1, characterized in that: The amount ratio of the silicon dioxide, 1H, 1H, 2H, 2H-perfluoroheptadecantrimethylsilane, ammonia water, deionized water and anhydrous ethanol is 5g: 1.5-4.5g: 3-4g: 3-5mL: 20-25mL.

8. The process for processing a sealed and waterproof polycarbonate board according to claim 1, characterized in that: The mass fraction of the ammonia water is 20-25%.

9. A process for processing a sealed and waterproof polycarbonate board according to claim 1, characterized in that: The volume fraction of the ethanol solution is 40-50%.

Images