Flame-retardant hot-melt adhesive film for battery and preparation method thereof

Abstract

The present invention discloses a flame-retardant hot-melt adhesive film for batteries. The flame-retardant hot-melt adhesive film comprises the following raw materials in parts by weight: 45-50 parts of polyester hot-melt adhesive, 25-35 parts of thermoplastic polyurethane, 15-20 parts of modified whisker distributor, 5-10 parts of nano-silica coordination modifier, 10-15 parts of melamine, and 3-6 parts of inorganic flame retardant. The flame-retardant hot-melt adhesive film for batteries of the present invention uses polyester hot-melt adhesive and thermoplastic polyurethane as matrix raw materials, uses melamine and inorganic flame retardant as main flame retardant agents to enhance the flame retardant properties of the product, and by adding the modified whisker distributor and nano-silica coordination modifier, the two are coordinated and synergistically combined to significantly improve the flame retardant and peeling properties of the product, thereby improving the application efficiency of the product.

Description

Technical Field

[0001] The present invention relates to the technical field of hot melt adhesive films, and in particular to a flame retardant hot melt adhesive film for batteries and a preparation method thereof. Background Art

[0002] Hot-melt adhesive film is a plastic adhesive film. Within a certain temperature range, its physical state changes with temperature, while its chemical properties remain unchanged. It is non-toxic, odorless, and environmentally friendly. Hot-melt adhesive film is widely used for bonding objects such as plastic, paper, wood, and textiles. Because hot-melt adhesive film melts when heated, it can achieve effective adhesion even on uneven surfaces.

[0003] The hot melt adhesive film used for batteries has poor flame retardancy and poor peel strength performance. It is difficult to achieve coordinated optimization of flame retardancy and peel strength performance, which limits the efficiency of product use. Summary of the Invention

[0004] In view of the defects of the prior art, the purpose of the present invention is to provide a flame-retardant hot-melt adhesive film for batteries and a preparation method thereof, so as to solve the problems raised in the above background technology.

[0005] The present invention solves the technical problem by adopting the following technical solutions:

[0006] The present invention provides a flame-retardant hot-melt adhesive film for batteries, which comprises the following raw materials in parts by weight:

[0007] 45-50 parts of polyester hot melt adhesive, 25-35 parts of thermoplastic polyurethane, 15-20 parts of modified whisker distribution agent, 5-10 parts of nano-silica coordination modifier, 10-15 parts of melamine, and 3-6 parts of inorganic flame retardant.

[0008] Preferably, the flame retardant hot melt adhesive film comprises the following raw materials in parts by weight:

[0009] 47.5 parts of polyester hot melt adhesive, 30 parts of thermoplastic polyurethane, 17.5 parts of modified whisker distribution agent, 7.5 parts of nano-silica coordination modifier, 12.5 parts of melamine, and 4.5 parts of inorganic flame retardant.

[0010] Preferably, the melting point of the thermoplastic polyurethane is 85-95°C, and the melt index is 42-45g / 10min / 2.16kg / 190°C; the polyester hot melt adhesive is a polyester hot melt adhesive polymerized from terephthalic acid, isophthalic acid, butanediol, and diethylene glycol; the product brand is JCC-3115; and the inorganic flame retardant is magnesium hydroxide.

[0011] Preferably, the preparation method of the modified whisker distribution agent is:

[0012] S01: mixing a 2-5% by mass hydrogen peroxide solution and a 2-5% by mass hydrochloric acid solution in a weight ratio of 1:3 to obtain a hydrochloric acid-hydrogen peroxide solution;

[0013] S02: The calcium sulfate whiskers are then added to a 3-5 times hydrochloric acid-hydrogen peroxide solution and stirred evenly, and then washed with water and dried to obtain pre-modified calcium sulfate whiskers;

[0014] S03: adding 2-3% of the total amount of the chitosan solution of silane coupling agent KH560 and 1-5% of the total amount of the chitosan solution of lanthanum sulfate solution to the chitosan solution, and stirring at a speed of 100-200 r / min for 10-20 minutes;

[0015] S04: Then, a 2-5% modifier of the total amount of the chitosan solution is added to S03, and the mixture is then placed in an ultrasonic oscillator for treatment at an ultrasonic power of 100-300W for 15-25 minutes. The chitosan compounding agent is obtained.

[0016] S05: adding the pre-modified calcium sulfate whiskers into the chitosan compounding agent for stirring and reacting, and after the stirring is completed, washing with water and drying to obtain a modified whisker distribution agent.

[0017] The inventors of the present invention have found that when the modified whisker distribution agent is replaced by calcium sulfate whiskers, the preparation method of the modified whisker distribution agent is different; when no regulating agent is used, the preparation method of the regulating agent is different; when the pre-modified calcium sulfate whiskers are replaced by calcium sulfate whiskers in the preparation of the modified whisker distribution agent, the performance of the product tends to deteriorate. Only when the modified whisker distribution agent prepared by the method of the present invention is coordinated with the nano-silica modifier, synergistic enhancement is achieved, and coordinated improvement of the flame retardancy and peeling properties of the product can be achieved.

[0018] Preferably, the mass fraction of the chitosan solution is 6-8%; the mass fraction of the lanthanum sulfate solution is 10-15%.

[0019] Preferably, the preparation method of the regulator is:

[0020] The flaky talc powder is added to a 10% dopamine hydrochloric acid solution with a mass fraction of 2-3 times that of the flaky talc powder, and stirred. The pH of the solution is then adjusted to 10.0-11.0, and stirring is continued at a constant speed for 45-55 minutes. After the reaction is completed, the solution is washed with water and dried. An aqueous solution of ammonium dihydrogen phosphate with a molar concentration of 0.12-0.18 mol / L and a molar concentration of 2-5% of the total amount of the product and sodium lauryl sulfate with a molar concentration of 2-5% of the total amount of the product are added to the product, and the product is sent to a ball mill for ball milling at a ball milling speed of 1000-1500 r / min for 1-2 hours. After the ball milling is completed, the solution is washed with water and dried to obtain a regulator.

[0021] The inventors of the present invention have found that without adding one of the modified whisker distribution agent and the nano-silica coordination modifier, the flame retardancy and peeling properties of the product are significantly reduced. The modified whisker distribution agent and the nano-silica coordination modifier work together to enhance their synergy, and the performance of the product can be coordinated and optimized.

[0022] Preferably, the stirring temperature in S05 is 40-45° C., the stirring time is 1-2 h, and the stirring speed is 550-650 r / min.

[0023] Preferably, the preparation method of the nano-silica coordination modifier is:

[0024] Nano-silica is added to a hydrochloric acid solution in a weight ratio of 1:5, and then a 5% sodium silicate aqueous solution with a mass fraction of 2-5% of the total amount of nano-silica is added, stirred evenly, washed with water, and dried. Then, the solution is treated at 120-130°C for 5-10 minutes, then raised to 210-220°C at a rate of 1-3°C / min, and then a 5% yttrium nitrate solution is sprayed on the surface until the surface is wetted, and then air-cooled to room temperature.

[0025] Preferably, the mass fraction of the hydrochloric acid solution is 5-9%.

[0026] The present invention also provides a method for preparing a flame-retardant hot-melt adhesive film for batteries, comprising the following steps: stirring the raw materials in sequence and evenly, then extruding them through a twin-screw extruder, water-cooling and granulating them, and drying the extruded pellets in a vacuum oven for 12-14 hours at a temperature of 82-85°C; and processing the dried pellets into an adhesive film product through an extrusion composite coating unit at 160-175°C.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The flame-retardant hot-melt adhesive film for batteries of the present invention adopts polyester hot-melt adhesive and thermoplastic polyurethane as matrix raw materials, and uses melamine and inorganic flame retardants as flame retardant main agents to enhance the flame retardant performance of the product. By adding a modified whisker distribution agent and a nano-silica coordination modifier, the two are coordinated and matched together to work synergistically, and the flame retardant performance and peeling performance of the product can be significantly improved, thereby improving the application efficiency of the product. DETAILED DESCRIPTION

[0029] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with specific embodiments. 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 making creative efforts are within the scope of protection of the present invention.

[0030] A flame-retardant hot-melt adhesive film for batteries according to this embodiment includes the following raw materials in parts by weight:

[0031] 45-50 parts of polyester hot melt adhesive, 25-35 parts of thermoplastic polyurethane, 15-20 parts of modified whisker distribution agent, 5-10 parts of nano-silica coordination modifier, 10-15 parts of melamine, and 3-6 parts of inorganic flame retardant.

[0032] The flame retardant hot melt adhesive film of this embodiment includes the following raw materials in parts by weight:

[0033] 47.5 parts of polyester hot melt adhesive, 30 parts of thermoplastic polyurethane, 17.5 parts of modified whisker distribution agent, 7.5 parts of nano-silica coordination modifier, 12.5 parts of melamine, and 4.5 parts of inorganic flame retardant.

[0034] The thermoplastic polyurethane of this embodiment has a melting point of 85-95°C and a melt index of 42-45g / 10min / 2.16kg / 190°C; the polyester hot melt adhesive is a polyester hot melt adhesive polymerized from terephthalic acid, isophthalic acid, butanediol, and diethylene glycol; the product brand is JCC-3115; and the inorganic flame retardant is magnesium hydroxide.

[0035] The preparation method of the modified whisker distribution agent of this embodiment is:

[0036] S01: mixing a 2-5% by mass hydrogen peroxide solution and a 2-5% by mass hydrochloric acid solution in a weight ratio of 1:3 to obtain a hydrochloric acid-hydrogen peroxide solution;

[0037] S02: The calcium sulfate whiskers are then added to a 3-5 times hydrochloric acid-hydrogen peroxide solution and stirred evenly, and then washed with water and dried to obtain pre-modified calcium sulfate whiskers;

[0038] S03: adding 2-3% of the total amount of the chitosan solution of silane coupling agent KH560 and 1-5% of the total amount of the chitosan solution of lanthanum sulfate solution to the chitosan solution, and stirring at a speed of 100-200 r / min for 10-20 minutes;

[0039] S04: Then, a 2-5% modifier of the total amount of the chitosan solution is added to S03, and the mixture is then placed in an ultrasonic oscillator for treatment at an ultrasonic power of 100-300W for 15-25 minutes. The chitosan compounding agent is obtained.

[0040] S05: adding the pre-modified calcium sulfate whiskers into the chitosan compounding agent for stirring and reacting, and after the stirring is completed, washing with water and drying to obtain a modified whisker distribution agent.

[0041] The mass fraction of the chitosan solution in this embodiment is 6-8%; the mass fraction of the lanthanum sulfate solution is 10-15%.

[0042] The preparation method of the regulator of this embodiment is:

[0043] The flaky talc powder is added to a 10% dopamine hydrochloric acid solution with a mass fraction of 2-3 times that of the flaky talc powder, and stirred. The pH of the solution is then adjusted to 10.0-11.0, and stirring is continued at a constant speed for 45-55 minutes. After the reaction is completed, the solution is washed with water and dried. An aqueous solution of ammonium dihydrogen phosphate with a molar concentration of 0.12-0.18 mol / L and a molar concentration of 2-5% of the total amount of the product and sodium lauryl sulfate with a molar concentration of 2-5% of the total amount of the product are added to the product, and the product is sent to a ball mill for ball milling at a ball milling speed of 1000-1500 r / min for 1-2 hours. After the ball milling is completed, the solution is washed with water and dried to obtain a regulator.

[0044] In S05 of this embodiment, the stirring temperature is 40-45° C., the stirring time is 1-2 h, and the stirring speed is 550-650 r / min.

[0045] The preparation method of the nano-silica coordination modifier of this embodiment is:

[0046] Nano-silica is added to a hydrochloric acid solution in a weight ratio of 1:5, and then a 5% sodium silicate aqueous solution with a mass fraction of 2-5% of the total amount of nano-silica is added, stirred evenly, washed with water, and dried. Then, the solution is treated at 120-130°C for 5-10 minutes, then raised to 210-220°C at a rate of 1-3°C / min, and then a 5% yttrium nitrate solution is sprayed on the surface until the surface is wetted, and then air-cooled to room temperature.

[0047] The mass fraction of the hydrochloric acid solution in this embodiment is 5-9%.

[0048] The method for preparing a flame-retardant hot-melt adhesive film for batteries according to the present embodiment comprises the following steps: uniformly stirring the raw materials in sequence, extruding them through a twin-screw extruder, water-cooling them, granulating them, and drying the extruded pellets in a vacuum oven for 12-14 hours at a temperature of 82-85°C; and coating the dried pellets through an extrusion composite laminating unit at a temperature of 160-175°C to form an adhesive film product.

[0049] Example 1

[0050] A flame-retardant hot-melt adhesive film for batteries according to this embodiment includes the following raw materials in parts by weight:

[0051] 45 parts of polyester hot melt adhesive, 25 parts of thermoplastic polyurethane, 15 parts of modified whisker distribution agent, 5 parts of nano-silica coordination modifier, 10 parts of melamine, and 3 parts of inorganic flame retardant.

[0052] The thermoplastic polyurethane of this embodiment has a melting point of 85°C and a melt index of 42g / 10min / 2.16kg / 190°C; the polyester hot melt adhesive is a polyester hot melt adhesive polymerized from terephthalic acid, isophthalic acid, butanediol, and diethylene glycol; the product brand is JCC-3115; and the inorganic flame retardant is magnesium hydroxide.

[0053] The preparation method of the modified whisker distribution agent of this embodiment is:

[0054] S01: mixing a 2% by mass hydrogen peroxide solution and a 2% by mass hydrochloric acid solution in a weight ratio of 1:3 to obtain a hydrochloric acid-hydrogen peroxide solution;

[0055] S02: The calcium sulfate whiskers are then added to a 3-fold hydrochloric acid-hydrogen peroxide solution and stirred evenly, and then washed with water and dried to obtain pre-modified calcium sulfate whiskers;

[0056] S03: Add 2% of the total amount of chitosan solution of silane coupling agent KH560 and 1% of the total amount of chitosan solution of lanthanum sulfate solution to the chitosan solution, and stir at a speed of 100 r / min for 10 minutes;

[0057] S04: Then, a 2% modifier of the total amount of the chitosan solution is added to S03, and the mixture is then placed in an ultrasonic oscillator for treatment at an ultrasonic power of 100W for 15 minutes. The chitosan compounding agent is obtained after the ultrasonic power is set to 100W.

[0058] S05: adding the pre-modified calcium sulfate whiskers into the chitosan compounding agent for stirring and reacting, and after the stirring is completed, washing with water and drying to obtain a modified whisker distribution agent.

[0059] The mass fraction of the chitosan solution in this embodiment is 6%; the mass fraction of the lanthanum sulfate solution is 10-15%.

[0060] The preparation method of the regulator of this embodiment is:

[0061] The flaky talc powder is added to a 10% dopamine hydrochloric acid solution with a mass fraction twice that of the flaky talc powder and stirred, and then the pH of the solution is adjusted to 10.0, and stirring is continued at a constant speed for 45 minutes. After the reaction is completed, the solution is washed with water and dried. An aqueous solution of ammonium dihydrogen phosphate with a molar concentration of 0.12 mol / L and a molar concentration of 2% of the total amount of the product and sodium lauryl sulfate with a molar concentration of 2% of the total amount of the product are added to the product, and the product is sent to a ball mill for ball milling at a ball milling speed of 1000 r / min for 1 hour. After the ball milling is completed, the solution is washed with water and dried to obtain a regulator.

[0062] In S05 of this embodiment, the stirring temperature is 40° C., the stirring time is 1 h, and the stirring speed is 550 r / min.

[0063] The preparation method of the nano-silica coordination modifier of this embodiment is:

[0064] Nano-silica was added to a hydrochloric acid solution at a weight ratio of 1:5, and then a 5% sodium silicate aqueous solution with a mass fraction of 2% of the total amount of nano-silica was added, stirred evenly, washed with water, and dried, and then treated at 120°C for 5 minutes, then raised to 210°C at a rate of 1°C / min, and then sprayed with a 5% yttrium nitrate solution on the surface until the surface was wetted, and then air-cooled to room temperature.

[0065] The mass fraction of the hydrochloric acid solution in this embodiment is 5%.

[0066] The method for preparing a flame-retardant hot-melt adhesive film for batteries in this embodiment includes the following steps: stirring the raw materials in sequence and evenly, then extruding them through a twin-screw extruder, water-cooling and granulating them, and drying the extruded pellets in a vacuum oven for 12 hours at a temperature of 82°C; and processing the dried pellets into a film product through an extrusion composite coating unit at 160°C.

[0067] Example 2

[0068] A flame-retardant hot-melt adhesive film for batteries according to this embodiment includes the following raw materials in parts by weight:

[0069] 50 parts of polyester hot melt adhesive, 35 parts of thermoplastic polyurethane, 20 parts of modified whisker distribution agent, 10 parts of nano-silica coordination modifier, 15 parts of melamine, and 6 parts of inorganic flame retardant.

[0070] The thermoplastic polyurethane of this embodiment has a melting point of 95°C and a melt index of 5g / 10min / 2.16kg / 190°C; the polyester hot melt adhesive is a polyester hot melt adhesive polymerized from terephthalic acid, isophthalic acid, butanediol, and diethylene glycol; the product brand is JCC-3115; and the inorganic flame retardant is magnesium hydroxide.

[0071] The preparation method of the modified whisker distribution agent of this embodiment is:

[0072] S01: mixing a 5% by mass hydrogen peroxide solution and a 5% by mass hydrochloric acid solution in a weight ratio of 1:3 to obtain a hydrochloric acid-hydrogen peroxide solution;

[0073] S02: The calcium sulfate whiskers are then added to a 5-fold hydrochloric acid-hydrogen peroxide solution and stirred evenly, and then washed with water and dried to obtain pre-modified calcium sulfate whiskers;

[0074] S03: adding 3% of the total amount of chitosan solution of silane coupling agent KH560 and 5% of the total amount of chitosan solution of lanthanum sulfate solution to the chitosan solution, and stirring at a speed of 200 r / min for 20 minutes;

[0075] S04: Then, a 5% modifier of the total amount of the chitosan solution is added to S03, and the mixture is then placed in an ultrasonic oscillator for treatment at an ultrasonic power of 300W for 25 minutes. The chitosan compounding agent is obtained after the ultrasonic power is set to 300W.

[0076] S05: adding the pre-modified calcium sulfate whiskers into the chitosan compounding agent for stirring and reacting, and after the stirring is completed, washing with water and drying to obtain a modified whisker distribution agent.

[0077] The mass fraction of the chitosan solution in this embodiment is 8%; the mass fraction of the lanthanum sulfate solution is 15%.

[0078] The preparation method of the regulator of this embodiment is:

[0079] The flaky talc powder is added to a 10% dopamine hydrochloric acid solution with a mass fraction of 3 times that of the flaky talc powder and stirred, and then the pH of the solution is adjusted to 11.0, and stirring is continued at a constant speed for 55 minutes. After the reaction is completed, the solution is washed with water and dried. An aqueous solution of ammonium dihydrogen phosphate with a molar concentration of 0.18 mol / L and a molar concentration of 2-5% of the total amount of the product and sodium lauryl sulfate with a total amount of 5% of the total amount of the product are added to the product, and the product is sent to a ball mill for ball milling at a ball milling speed of 1500 r / min for 2 hours. After the ball milling is completed, the solution is washed with water and dried to obtain a regulator.

[0080] In S05 of this embodiment, the stirring temperature is 45° C., the stirring time is 2 h, and the stirring speed is 650 r / min.

[0081] The preparation method of the nano-silica coordination modifier of this embodiment is:

[0082] Nano-silica was added to a hydrochloric acid solution in a weight ratio of 1:5, and then a 5% sodium silicate aqueous solution with a mass fraction of 5% of the total amount of nano-silica was added, stirred evenly, washed with water, and dried, and then treated at 130°C for 10 minutes, then raised to 220°C at a rate of 3°C / min, and then sprayed with a 5% yttrium nitrate solution on the surface until the surface was wetted, and then air-cooled to room temperature.

[0083] The mass fraction of the hydrochloric acid solution in this embodiment is 9%.

[0084] The method for preparing a flame-retardant hot-melt adhesive film for batteries in this embodiment includes the following steps: stirring the raw materials in sequence and evenly, then extruding them through a twin-screw extruder, water-cooling and granulating them, and drying the extruded pellets in a vacuum oven for 14 hours at a temperature of 85°C; and processing the dried pellets into a film product through an extrusion composite coating unit at 175°C.

[0085] Example 3

[0086] A flame-retardant hot-melt adhesive film for batteries according to this embodiment includes the following raw materials in parts by weight:

[0087] 47.5 parts of polyester hot melt adhesive, 30 parts of thermoplastic polyurethane, 17.5 parts of modified whisker distribution agent, 7.5 parts of nano-silica coordination modifier, 12.5 parts of melamine, and 4.5 parts of inorganic flame retardant.

[0088] The thermoplastic polyurethane of this embodiment has a melting point of 90°C and a melt index of 43.5g / 10min / 2.16kg / 190°C; the polyester hot melt adhesive is a polyester hot melt adhesive polymerized from terephthalic acid, isophthalic acid, butanediol, and diethylene glycol; the product brand is JCC-3115; and the inorganic flame retardant is magnesium hydroxide.

[0089] The preparation method of the modified whisker distribution agent of this embodiment is:

[0090] S01: mixing a 3.5% by mass hydrogen peroxide solution and a 3% by mass hydrochloric acid solution in a weight ratio of 1:3 to obtain a hydrochloric acid-hydrogen peroxide solution;

[0091] S02: The calcium sulfate whiskers are then added to a 4-fold hydrochloric acid-hydrogen peroxide solution and stirred evenly, and then washed with water and dried to obtain pre-modified calcium sulfate whiskers;

[0092] S03: Add 2.5% of the total amount of chitosan solution of silane coupling agent KH560 and 3% of the total amount of chitosan solution of lanthanum sulfate solution to the chitosan solution, and stir at a speed of 150 r / min for 15 minutes;

[0093] S04: Then, a 3.5% modifier of the total amount of the chitosan solution is added to S03, and the mixture is then placed in an ultrasonic oscillator for treatment at an ultrasonic power of 200W for 20 minutes. After the treatment, a chitosan compounding agent is obtained.

[0094] S05: adding the pre-modified calcium sulfate whiskers into the chitosan compounding agent for stirring and reacting, and after the stirring is completed, washing with water and drying to obtain a modified whisker distribution agent.

[0095] The mass fraction of the chitosan solution in this embodiment is 7%; the mass fraction of the lanthanum sulfate solution is 12.5%.

[0096] The preparation method of the regulator of this embodiment is:

[0097] The flaky talc powder is added to a 10% dopamine hydrochloric acid solution with a mass fraction of 2.5 times that of the flaky talc powder and stirred, and then the pH of the solution is adjusted to 10.5, and stirring is continued at a constant speed for 50 minutes. After the reaction is completed, the solution is washed with water and dried. An aqueous solution of ammonium dihydrogen phosphate with a molar concentration of 0.15 mol / L and a molar concentration of 3.5% of the total amount of the product and sodium lauryl sulfate with a molar concentration of 3.5% of the total amount of the product are added to the product, and the product is sent to a ball mill for ball milling at a ball milling speed of 1250 r / min for 1.5 hours. After the ball milling is completed, the solution is washed with water and dried to obtain a regulator.

[0098] In S05 of this embodiment, the stirring temperature is 42° C., the stirring time is 1.5 h, and the stirring speed is 600 r / min.

[0099] The preparation method of the nano-silica coordination modifier of this embodiment is:

[0100] Nano-silica was added to a hydrochloric acid solution in a weight ratio of 1:5, and then a 5% sodium silicate aqueous solution with a total mass fraction of 3.5% of the nano-silica was added, stirred evenly, washed with water, and dried, and then treated at 125°C for 7.5 minutes, then raised to 215°C at a rate of 2°C / min, and then sprayed with a 5% yttrium nitrate solution on the surface until the surface was wetted, and then air-cooled to room temperature.

[0101] The mass fraction of the hydrochloric acid solution in this embodiment is 7%.

[0102] The method for preparing a flame-retardant hot-melt adhesive film for batteries in this embodiment includes the following steps: stirring the raw materials in sequence and evenly, then extruding them through a twin-screw extruder, water-cooling and granulating them, and drying the extruded pellets in a vacuum oven for 13 hours at a temperature of 83°C; and processing the dried pellets into a film product through an extrusion composite coating unit at 170°C.

[0103] Comparative Example 1.

[0104] The difference from Optimization Example 3 is that no modified whisker distribution agent is added.

[0105] Comparative Example 2.

[0106] The difference from Optimization Example 3 is that the modified whisker distribution agent is replaced by calcium sulfate whiskers.

[0107] Comparative Example 3.

[0108] The difference from Optimization Example 3 is that the preparation method of the modified whisker distribution agent is different; no regulator treatment is used.

[0109] Comparative Example 4.

[0110] The difference from Optimization Example 3 is that the preparation method of the regulator is different; flaky talc powder is added to a 10% dopamine hydrochloric acid solution with a mass fraction of 2.5 times that of the flaky talc powder and stirred, and then the pH of the solution is adjusted to 10.5, and stirring is continued at a constant speed for 50 minutes. After the reaction is completed, it is washed with water and dried to obtain the regulator.

[0111] Comparative Example 5.

[0112] The difference from Optimization Example 3 is that pre-modified calcium sulfate whiskers are replaced by calcium sulfate whiskers in the preparation of the modified whisker distribution agent.

[0113] Comparative Example 6.

[0114] The difference from Optimization Example 3 is that no nano-silica coordination modifier is added.

[0115] The performance measurement results of Examples 1-3 and Comparative Examples 1-6 are as follows

[0116] Peel force (N / 25mm) Flame burning time (s) Example 1 26.3 2.3 Example 2 26.5 2.1 Example 3 26.8 1.8 Comparative Example 1 18.2 5.8 Comparative Example 2 19.1 5.4 Comparative Example 3 20.3 5.2 Comparative Example 4 22.1 4.7 Comparative Example 5 21.5 5.0 Comparative Example 6 19.2 5.6

[0117] From Examples 1-3 and Comparative Examples 1-6, it can be concluded that the product of the present invention itself has excellent flame retardancy and peeling performance effects, and the flame retardancy and peeling performance can achieve a coordinated effect. The performance of the prepared product can achieve a coordinated and significant improvement in flame retardancy and peeling performance; without adding one of the modified whisker distribution agent and the nano-silica coordination modifier, the flame retardancy and peeling performance of the product are significantly reduced. The modified whisker distribution agent and the nano-silica coordination modifier are coordinated and synergistic, and the performance of the product can achieve coordinated optimization;

[0118] At the same time, it was found that when the modified whisker distribution agent was replaced by calcium sulfate whiskers, the preparation method of the modified whisker distribution agent was different; when no regulating agent was used, the preparation method of the regulating agent was different; when the pre-modified calcium sulfate whiskers were replaced by calcium sulfate whiskers in the preparation of the modified whisker distribution agent, the performance of the product tended to deteriorate. Only when the modified whisker distribution agent prepared by the method of the present invention and the nano-silica coordinated modifier were synergistically enhanced, the flame retardant and peeling properties of the product could be coordinatedly improved.

[0119] 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.

[0120] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A flame retardant hot melt adhesive film for batteries, characterized in that: The flame retardant hot melt adhesive film for batteries comprises the following raw materials in parts by weight: 45-50 parts of polyester hot melt adhesive, 25-35 parts of thermoplastic polyurethane, 15-20 parts of modified whisker distribution agent, 5-10 parts of nano-silica coordination modifier, 10-15 parts of melamine, and 3-6 parts of inorganic flame retardant; The preparation method of the modified whisker distribution agent is: S01: mixing a 2-5% by mass hydrogen peroxide solution and a 2-5% by mass hydrochloric acid solution in a weight ratio of 1:3 to obtain a hydrochloric acid-hydrogen peroxide solution; S02: The calcium sulfate whiskers are then added to a 3-5 times hydrochloric acid-hydrogen peroxide solution and stirred evenly, and then washed with water and dried to obtain pre-modified calcium sulfate whiskers; S03: Add 2-3% of the total amount of chitosan solution of silane coupling agent KH560 and 1-5% of the total amount of chitosan solution of lanthanum sulfate solution to the chitosan solution, and stir at a speed of 100-200 r / min for 10-20 minutes; S04: Then, a regulator of 2-5% of the total amount of the chitosan solution is added to S03, and then the mixture is sent to an ultrasonic oscillator for treatment at an ultrasonic power of 100-300W for 15-25 minutes. After the end, a chitosan compounding agent is obtained; S05: adding the pre-modified calcium sulfate whiskers to the chitosan compounding agent for stirring and reacting, washing with water, and drying to obtain a modified whisker distribution agent; The preparation method of the nano-silica coordination modifier is: Add nano-silica to a hydrochloric acid solution at a weight ratio of 1:5, then add a 5% sodium silicate aqueous solution with a mass fraction of 2-5% of the total amount of nano-silica, stir evenly, wash with water, and dry, then treat at 120-130°C for 5-10 minutes, then increase the temperature to 210-220°C at a rate of 1-3°C / min, and then spray a 5% yttrium nitrate solution on the surface until the surface is wetted, and then air-cool to room temperature.

2. The flame-retardant hot melt adhesive film for batteries according to claim 1, characterized in that: The flame retardant hot melt adhesive film comprises the following raw materials in parts by weight: 47.5 parts of polyester hot melt adhesive, 30 parts of thermoplastic polyurethane, 17.5 parts of modified whisker distribution agent, 7.5 parts of nano-silica coordination modifier, 12.5 parts of melamine, and 4.5 parts of inorganic flame retardant.

3. The flame-retardant hot melt adhesive film for batteries according to claim 1, characterized in that: The thermoplastic polyurethane has a melting point of 85-95°C and a melt index of 42-45g / 10min / 2.16kg / 190°C. The polyester hot melt adhesive is a polyester hot melt adhesive polymerized from terephthalic acid, isophthalic acid, butanediol, and diethylene glycol. The product brand is JCC-3115. The inorganic flame retardant is magnesium hydroxide.

4. The flame-retardant hot melt adhesive film for batteries according to claim 1, characterized in that: The mass fraction of the chitosan solution is 6-8%; the mass fraction of the lanthanum sulfate solution is 10-15%.

5. The flame-retardant hot melt adhesive film for batteries according to claim 1, characterized in that: The preparation method of the regulator is: The flaky talc powder is added to a 10% dopamine hydrochloric acid solution with a mass fraction of 2-3 times that of the flaky talc powder and stirred, and then the pH of the solution is adjusted to 10.0-11.0, and stirring is continued at a constant speed for 45-55 minutes. After the reaction is completed, the solution is washed with water and dried. An aqueous solution of ammonium dihydrogen phosphate with a molar concentration of 0.12-0.18 mol / L and 2-5% of the total amount of the product and sodium lauryl sulfate with a molar concentration of 2-5% of the total amount of the product are added to the product, and the product is sent to a ball mill for ball milling at a ball milling speed of 1000-1500 r / min for 1-2 hours. After the ball milling is completed, the solution is washed with water and dried to obtain a regulator.

6. The flame-retardant hot melt adhesive film for batteries according to claim 5, characterized in that: The stirring temperature in S05 is 40-45° C., the stirring time is 1-2 h, and the stirring speed is 550-650 r / min.

7. The flame-retardant hot melt adhesive film for batteries according to claim 1, characterized in that: The mass fraction of the hydrochloric acid solution is 5-9%.

8. The method for preparing a flame-retardant hot melt adhesive film for batteries according to claim 1, wherein: The following steps are involved: The raw materials are stirred evenly in sequence, then extruded by a twin-screw extruder, water-cooled and granulated, and the extruded pellets are dried in a vacuum oven for 12-14 hours at a temperature of 82-85°C; the dried pellets are processed and coated into film products by an extrusion composite coating unit at 160-175°C.