Thermoplastic plate of environment-friendly recyclable aircraft interior table plate and preparation method of thermoplastic plate

Abstract

The invention belongs to the technical field of thermoplastic plate manufacturing, and particularly relates to an environment-friendly and recoverable thermoplastic plate of an aircraft interior table plate and a preparation method of the environment-friendly and recoverable thermoplastic plate. The chlorinated polyvinyl chloride resin and the acrylic resin are mixed, the composite stabilizer is added on the basis of the prior art, and the zeolite molecular sieve, the organic calcium stabilizer and the organic tin stabilizer are compounded to synergistically inhibit the chlorinated polyvinyl chloride resin from decomposing hydrogen chloride; the toughening flame retardant prepared by wrapping the surface-modified magnesium sulfate fibers with the chitosan not only can play a flame-retardant effect, but also has the function of a reinforcement, effectively hinders expansion of cracks in the thermoplastic plate, and improves the strength and toughness of the thermoplastic plate; a hydroxyl group is introduced into the shell of the shell-core anti-impact modifier, so that the compatibility of the shell-core anti-impact modifier and resin is improved, and the notch impact strength of the thermoplastic plate is enhanced; the prepared thermoplastic plate has excellent flame retardance and mechanical properties, is easy to process and recycle, reduces the escape of hydrogen chloride gas in the production process, and is environment-friendly.

Description

Technical Field

[0001] The invention belongs to the technical field of thermoplastic plate manufacturing, and in particular relates to an environmentally friendly and recyclable thermoplastic plate for an aircraft interior decoration table top and a preparation method thereof. Background Art

[0002] In recent years, domestic civil aircraft have received great attention from governments at all levels and key support from national industrial policies. The "four properties" of civil aircraft, namely safety, economy, comfort and environmental protection, are also the goals of civil aircraft development. Aircraft interior table panels are important facilities in the aircraft cabin for passengers to eat, work or place items. They need to have flame retardant, shock resistant, weather resistant and aging resistant properties. Chlorinated polyvinyl chloride resin is a polymer compound further chlorinated and modified by polyvinyl chloride. It has good flame retardancy, corrosion resistance and mechanical strength, but its melting temperature is high, fluidity is poor, and the decomposition temperature is close to the processing temperature. Therefore, it is necessary to study its preparation process, modifier composition and other aspects to make the flame retardant, strength and other properties of chlorinated polyvinyl chloride resin meet aviation standards.

[0003] The Chinese invention patent with publication number CN110396272A discloses a highly flame-retardant, high-strength and high-temperature resistant easy-to-form thermoplastic sheet and its preparation method, which belongs to the field of easy-to-form thermoplastic sheets. The following scheme is proposed, which is composed of the following raw materials in parts by weight: MBS 10-30 parts, polyvinyl chloride resin 10-30 parts, ABS 30-45 parts, PMMA 8-15 parts, heat stabilizer 1-2 parts, auxiliary stabilizer 0.5-2 parts, o-hydroxybenzophenone derivative 1-2 parts, external lubricant 1-4 parts, internal lubricant 1-4 parts, processing aid 1-2 parts, impact modifier 2-5 parts, pigment 0-1 parts, when the temperature rises to 80°C, the above-mentioned processing aid, pigment and impact modifier are added, when the temperature rises to 125°C, the mixture is discharged into a cold mixing device for cooling and stirring, the stirring speed is 80 revolutions, and the temperature drops to 40°C. The invention has reasonable ingredients, simple preparation, significant progress, and is suitable for promotion and use. However, the prior art has a technical problem that the thermoplastic plate has not been further improved through the composition process to improve the stability, processability and impact resistance of the thermoplastic plate. Summary of the invention

[0004] The purpose of the present invention is to provide an environmentally friendly and recyclable thermoplastic board for aircraft interior table panels and a preparation method thereof, so as to solve the technical problem that the prior art has not further improved the composition process of the thermoplastic board to improve the stability, processability and impact resistance of the thermoplastic board.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An environmentally friendly and recyclable thermoplastic board for an aircraft interior table top is prepared from the following components in parts by weight:

[0007] 90-100 parts of chlorinated polyvinyl chloride resin, 5-15 parts of acrylic resin, 3-6 parts of toughening flame retardant, 2-5 parts of composite stabilizer, 0.5-1.8 parts of internal lubricant, 0.2-2.5 parts of external lubricant, 10-30 parts of shell-core impact modifier, 0.5-2 parts of antioxidant, 0.5-2 parts of antistatic agent, 6-10 parts of masterbatch, 10-20 parts of carbonizing agent and 0.5-1.5 parts of anti-ultraviolet aging agent.

[0008] The composite stabilizer is composed of 0.5 to 2 parts of zeolite molecular sieve powder, 1 to 2 parts of organic calcium stabilizer and 1 to 4 parts of organic tin stabilizer, and the mass ratio of zeolite molecular sieve powder to organic tin stabilizer is 1:1 to 2.

[0009] The organic calcium stabilizer is one or more combinations of calcium stearate, calcium laurate and calcium citrate.

[0010] The organic tin stabilizer is one or more combinations of methyl tin mercaptan, tin maleate, and dibutyltin dilaurate.

[0011] The magnesium sulfate fiber crystal shape of the toughening flame retardant is one or more combinations of 152, 153, 435, and the average length is 30-50 μm.

[0012] The core-shell impact modifier is a polyacrylate-based core-shell impact modifier with an average particle size of 0.3-0.6 μm and a core-shell mass ratio of 7-8:2-3.

[0013] The internal lubricant is one or more combinations of polyethylene wax, trihydroxystearate, and ethylene bisstearamide; the external lubricant is one or more combinations of paraffin wax, Fischer-Tropsch wax, and stearic acid; the antioxidant is one or more combinations of 168, 608, 1010, and 1076; the antistatic agent is one or more combinations of FT-105, BYK-5128, and SN-62; the carbon-forming agent is one or more combinations of pentaerythritol, dipentaerythritol, and piperazine pyrophosphate; the anti-ultraviolet aging agent is one or more combinations of GW-540, UV-9, and UV-326.

[0014] A method for preparing an environmentally friendly and recyclable thermoplastic board for an aircraft interior table top comprises the following steps:

[0015] S1. Weigh the required raw materials, dry them and pack them into bags for later use;

[0016] S2, adding chlorinated polyvinyl chloride resin, acrylic resin, masterbatch and composite stabilizer into a hot mixer, heating to 50-60°C, mixing at a speed of 300-500r / min for 5-10min, then adding internal lubricant and external lubricant into the hot mixer, heating to 70-80°C, mixing at a speed of 300-500r / min for 5-10min, adding shell-core anti-impact modifier, antioxidant, antistatic agent and anti-ultraviolet aging agent, continuing to mix and heating to 90-100°C, mixing at a speed of 300-500r / min for 5-10min, adding carbonizing agent, heating to 110-120°C, mixing at a speed of 300-500r / min for 5-10min, putting the materials in the hot mixer into cold mixing and cooling to 40-50°C to obtain a premix;

[0017] S3, placing the premix into a silo, conveying the premix to a twin-screw extruder for melt extrusion to obtain a molten material;

[0018] S4. Put the melt into a mold, extrude and shape it through a three-roll calender, and shear and trim to obtain a thermoplastic plate.

[0019] Preferably, the temperatures of each temperature zone of the twin-screw extruder in S3 are set to 165-175°C for zone one, 165-175°C for zone two, 175-185°C for zone three, 170-180°C for zone four, 170-180°C for zone five and the head temperature is 170-180°C.

[0020] Preferably, the temperature of the upper roll of the three-roll calender in S4 is 100-120°C, the temperature of the middle roll is 90-110°C, and the temperature of the lower roll is 90-100°C.

[0021] The preparation method of the composite stabilizer comprises the following steps:

[0022] S11. Add 2 to 3 parts of sodium aluminate and 8 to 9 parts of sodium silicate to 25 to 30 parts of deionized water, respectively, to prepare sodium aluminate solution and sodium silicate solution, then slowly add the sodium aluminate solution to the sodium silicate solution, add 3 to 5 parts of sodium hydroxide, crystallize at 80 to 90° C. for 10 to 12 hours, collect the solid by filtration, dry and grind to obtain zeolite molecular sieve powder;

[0023] S12. Mix 0.5 to 2 parts of zeolite molecular sieve powder, 1 to 2 parts of organic calcium stabilizer, and 1 to 4 parts of organic tin stabilizer by mass to prepare a composite stabilizer.

[0024] Preferably, the zeolite molecular sieve powder in S11 has a silicon-aluminum ratio of 1.8-2, a sodium-silicon ratio of 1.6-1.8, and a water-sodium ratio of 50-60.

[0025] The preparation method of the toughened flame retardant comprises the following steps:

[0026] S21. Add 5 to 10 parts of magnesium sulfate fiber by mass to 80 to 100 parts of deionized water, add citric acid to adjust the pH to 4 to 5, etch at 40 to 50° C. for 1 to 2 hours, wash with ethanol, add to deionized water for ultrasonic dispersion to form a dispersion with a concentration of 2 to 3 wt%, dissolve 10 to 15 parts of fatty acid in a mixed solution of ethanol and deionized water and add to the dispersion, stir at 40 to 60° C. at a speed of 2 to 4 hours, collect the solid and wash with ethanol, and dry at 40 to 60° C. to obtain surface-modified magnesium sulfate fiber;

[0027] S22. Add 5 to 10 parts of surface modified magnesium sulfate fiber to 80 to 100 parts of deionized water by mass, disperse by ultrasonic, add 1 to 2 parts of carboxymethyl chitosan, stir evenly, condense and reflux at 120 to 130°C and stir for 12 to 18 hours, put the mixed solution into a centrifuge, centrifuge at a speed of 4000 to 5000 r / min for 10 to 15 minutes, collect the precipitate, wash it alternately with deionized water and anhydrous ethanol for 2 to 3 times, and dry it at a low temperature of 0 to 10°C to obtain a toughened flame retardant.

[0028] Preferably, the fatty acid in S21 is one or more combinations of lauric acid, oleic acid and capric acid.

[0029] Preferably, the mass ratio of ethanol to deionized water in the mixed solution of ethanol and deionized water in S21 is 2-5:3-4.

[0030] The preparation method of the core-shell impact modifier comprises the following steps:

[0031] S31. Add 100-200 parts of deionized water, 0.5-2 parts of emulsifier and 0.5-2 parts of electrolyte salt into a reactor by mass, stir at a speed of 200-300 r / min until the solid is completely dissolved, then add 5-10 parts of butyl acrylate and 1-3 parts of allyl methacrylate, introduce nitrogen, heat to 60-65° C., add 0.05-0.08 parts of ammonium persulfate, stir at a speed of 200-300 r / min, heat to 80-90° C. and react for 0.5-2h to obtain a seed emulsion;

[0032] S32, by mass, adding 30 to 60 parts of butyl acrylate and 1 to 3 parts of allyl methacrylate to 100 to 200 parts of the seed emulsion, and adding 0.3 to 0.8 parts of ammonium persulfate, and polymerizing at 80 to 90° C. for 2 to 3 hours under a nitrogen atmosphere to obtain a latex;

[0033] S33. To 90 to 100 parts of latex, add 15 to 30 parts of methyl methacrylate, 3 to 6 parts of 2-hydroxybutyl methacrylate and 0.1 to 0.2 parts of diethylaminoethyl methacrylate, add 0.1 to 0.5 parts of ammonium persulfate, raise the temperature to 80 to 90°C and keep it for 1 to 2 hours under the protection of nitrogen atmosphere, add excess ethanol to break the emulsion, wash with deionized water, and dry at 50 to 60°C to obtain a core-shell impact modifier.

[0034] Preferably, the emulsifier in S31 is one or more combinations of sodium dodecyl sulfate, dodecyl polyoxyethylene ether, and block polyether.

[0035] Preferably, the electrolyte in S31 is one or more combinations of sodium carbonate, potassium carbonate and sodium bicarbonate.

[0036] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0037] 1. The present invention mixes chlorinated polyvinyl chloride resin and acrylic resin, adds a composite stabilizer on the basis of the prior art, and synergistically inhibits the decomposition of hydrogen chloride in the chlorinated polyvinyl chloride resin by compounding zeolite molecular sieve, organic calcium stabilizer and organic tin stabilizer; the toughened flame retardant prepared by chitosan-wrapped surface-modified magnesium sulfate fiber not only has a flame retardant effect, but also the magnesium sulfate fiber has the function of a reinforcement, effectively hinders the expansion of cracks in the thermoplastic board, and improves the strength and toughness of the thermoplastic board; the shell of the core-shell impact modifier introduces hydroxyl functional groups, improves the compatibility of the core-shell impact modifier with the resin, and enhances the notched impact strength of the thermoplastic board; the prepared thermoplastic board has excellent flame retardant and mechanical properties, is easy to process and recycle, reduces the escape of hydrogen chloride gas in the production process, and is environmentally friendly.

[0038] 2. The zeolite molecular sieve prepared by the present invention has basic groups attached to its surface which can quickly neutralize the hydrogen chloride gas produced by the degradation of chlorinated polyvinyl chloride resin during processing. The pore structure can inhibit the escape of hydrogen chloride gas, promote resin melting, shorten the plasticizing time and inhibit resin decomposition. In addition, it can be used in combination with organic calcium stabilizers and organic tin stabilizers to improve the thermal stability of thermoplastic plates.

[0039] 3. The present invention improves the compatibility between the fiber and the resin by etching with citric acid, then adding fatty acid to modify the surface of the magnesium sulfate fiber, and then wrapping the surface modified magnesium sulfate fiber with carboxymethyl chitosan. The obtained toughened flame retardant can be evenly dispersed in the thermoplastic board, thereby improving the flame retardant and mechanical properties of the thermoplastic board.

[0040] 4. The present invention uses seed emulsion polymerization, butyl acrylate as a core monomer, methyl methacrylate as a hard shell monomer, allyl methacrylate as a crosslinking agent, and 2-hydroxybutyl methacrylate and diethylaminoethyl methacrylate for modification. The shell of the core-shell impact modifier prepared by the present invention introduces hydroxyl functional groups, thereby improving the compatibility of the core-shell impact modifier with the resin and enhancing the notched impact strength of the thermoplastic plate. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention are described clearly and completely below. 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.

[0042] Example 1: An environmentally friendly and recyclable thermoplastic board for an aircraft interior table top in this example is prepared from the following components in parts by weight:

[0043] 100 parts of chlorinated polyvinyl chloride resin, 15 parts of acrylic resin, 3 parts of toughening flame retardant, 3 parts of composite stabilizer, 1.5 parts of internal lubricant, 1.5 parts of external lubricant, 20 parts of shell-core impact modifier, 1.3 parts of antioxidant, 1.2 parts of antistatic agent, 8 parts of masterbatch, 15 parts of carbonizing agent and 1 part of anti-ultraviolet aging agent.

[0044] The composite stabilizer of this embodiment is composed of 1 part of zeolite molecular sieve powder, 2 parts of calcium stearate and 1.5 parts of methyl tin mercaptan.

[0045] The magnesium sulfate fiber of the toughened flame retardant of this embodiment has a crystal shape of 152 and an average length of 35 μm.

[0046] The core-shell impact modifier of the present embodiment is a polyacrylate-based core-shell impact modifier with an average particle size of 0.4 μm and a core-shell mass ratio of 7:3.

[0047] The internal lubricant of this embodiment is polyethylene wax, the external lubricant is stearic acid, the antioxidant is 168 and 1076 mixed in a mass ratio of 1:1, the antistatic agent is FT-105, the carbonizing agent is pentaerythritol, and the anti-ultraviolet aging agent is UV-9.

[0048] The method for preparing an environmentally friendly and recyclable thermoplastic board for an aircraft interior table top in this embodiment comprises the following steps:

[0049] S1. Weigh the required raw materials, dry them and pack them into bags for later use;

[0050] S2, adding chlorinated polyvinyl chloride resin, acrylic resin, masterbatch and composite stabilizer into a hot mixer, heating to 50°C, mixing at a speed of 300r / min for 5min, then adding internal lubricant and external lubricant into the hot mixer, heating to 80°C, mixing at a speed of 500r / min for 5min, adding shell-core anti-impact modifier, antioxidant, antistatic agent and anti-ultraviolet aging agent, continuing to mix and heating to 100°C, mixing at a speed of 500r / min for 5min, adding carbonizing agent, heating to 110°C, mixing at a speed of 300r / min for 10min, putting the materials in the hot mixer into cold mixing and cooling to 40°C to obtain a premix;

[0051] S3, putting the premix into a silo, conveying it to a twin-screw extruder, wherein the temperature of each temperature zone of the twin-screw extruder is 165° C. in zone 1, 170° C. in zone 2, 175° C. in zone 3, 170° C. in zone 4, 170° C. in zone 5, and the head temperature is 170° C., and melt extrusion is performed to obtain a melt;

[0052] S4. Put the melt into a mold, extrude and shape it through a three-roll calender, with the upper roll temperature being 110°C, the middle roll temperature being 100°C, and the lower roll temperature being 90°C. Shear and trim the edges to obtain a thermoplastic plate.

[0053] The preparation method of the composite stabilizer of this embodiment comprises the following steps:

[0054] S11. Add 2.5 parts of sodium aluminate and 8.5 parts of sodium silicate to 25 parts of deionized water respectively to prepare sodium aluminate solution and sodium silicate solution, then slowly add the sodium aluminate solution to the sodium silicate solution, add 4 parts of sodium hydroxide, crystallize at 90° C. for 10 hours, collect the solid by filtration, dry and grind to obtain zeolite molecular sieve powder;

[0055] S12. Mix 1 part of zeolite molecular sieve powder, 2 parts of calcium stearate and 1.5 parts of methyl tin mercaptan, by mass, to prepare a composite stabilizer.

[0056] The preparation method of the toughened flame retardant of this embodiment comprises the following steps:

[0057] S21. Add 10 parts of magnesium sulfate fiber to 100 parts of deionized water by mass, add citric acid to adjust the pH to 4, etch at 50°C for 1 hour, wash with ethanol, add deionized water for ultrasonic dispersion to form a dispersion with a concentration of 2wt%, dissolve 10 parts of lauric acid in a mixed solution of ethanol and deionized water in a mass ratio of 2:3, and then add the dispersion, stir at 60°C for 2 hours at a speed of , collect the solid and wash with ethanol, and dry at 60°C to obtain surface-modified magnesium sulfate fiber;

[0058] S22. Add 10 parts of surface modified magnesium sulfate fiber to 100 parts of deionized water by mass, disperse by ultrasonic, add 2 parts of carboxymethyl chitosan, stir evenly, condense and reflux at 120°C and stir for 12 hours, put the mixed solution into a centrifuge, centrifuge at a speed of 5000r / min for 10 minutes, collect the precipitate, wash it alternately with deionized water and anhydrous ethanol for 3 times, and dry it at 10°C to obtain a toughened flame retardant.

[0059] The preparation method of the core-shell impact modifier of this embodiment comprises the following steps:

[0060] S31. Add 100 parts of deionized water, 0.5 parts of sodium dodecyl sulfate and 0.5 parts of sodium bicarbonate into a reactor by mass, stir at a speed of 300 r / min until the solid is completely dissolved, then add 10 parts of butyl acrylate and 2 parts of allyl methacrylate, introduce nitrogen, heat to 60°C, add 0.05 parts of ammonium persulfate, stir at a speed of 300 r / min, heat to 90°C and react for 1 hour to obtain a seed emulsion;

[0061] S32, by mass, add 30 parts of butyl acrylate and 1 part of allyl methacrylate to 100 parts of the seed emulsion, add 0.3 parts of ammonium persulfate, and polymerize at 80° C. for 2 hours under nitrogen atmosphere to obtain a latex;

[0062] S33. To 100 parts of latex, add 20 parts of methyl methacrylate, 6 parts of 2-hydroxybutyl methacrylate and 0.2 parts of diethylaminoethyl methacrylate, add 0.3 parts of ammonium persulfate, and under the protection of nitrogen atmosphere, heat to 80°C and keep warm for 1 hour. Add excess ethanol to break the emulsion, wash with deionized water, and dry at 60°C to obtain a core-shell impact modifier.

[0063] Example 2: An environmentally friendly and recyclable thermoplastic board for an aircraft interior table top in this example is prepared from the following components in parts by weight:

[0064] 90 parts of chlorinated polyvinyl chloride resin, 10 parts of acrylic resin, 3 parts of toughening flame retardant, 2 parts of composite stabilizer, 1.8 parts of internal lubricant, 0.2 parts of external lubricant, 10 parts of shell-core impact modifier, 0.5 parts of antioxidant, 2 parts of antistatic agent, 6 parts of masterbatch, 10 parts of carbonizing agent and 1.5 parts of anti-ultraviolet aging agent.

[0065] The composite stabilizer of this embodiment is composed of 1.5 parts of zeolite molecular sieve powder, 1 part of calcium laurate, 1 part of tin maleate and 1 part of dibutyl tin dilaurate.

[0066] The magnesium sulfate fiber of the toughened flame retardant of this embodiment has a crystal shape of 153 and an average length of 42 μm.

[0067] The core-shell impact modifier of the present embodiment is a polyacrylate-based core-shell impact modifier with an average particle size of 0.4 μm and a core-shell mass ratio of 8:2.

[0068] In this embodiment, the internal lubricant is ethylene bisstearamide, the external lubricant is Fischer-Tropsch wax, the antioxidant is 608, the antistatic agent is BYK-5128, the carbonizing agent is dipentaerythritol, and the anti-ultraviolet aging agent is GW-540.

[0069] The method for preparing an environmentally friendly and recyclable thermoplastic board for an aircraft interior table top in this embodiment comprises the following steps:

[0070] S1. Weigh the required raw materials, dry them and pack them into bags for later use;

[0071] S2, adding chlorinated polyvinyl chloride resin, acrylic resin, masterbatch and composite stabilizer into a hot mixer, heating to 50°C, mixing at a speed of 400r / min for 5min, then adding internal lubricant and external lubricant into the hot mixer, heating to 70°C, mixing at a speed of 400r / min for 5min, adding shell-core anti-impact modifier, antioxidant, antistatic agent and anti-ultraviolet aging agent, continuing to mix and heating to 90°C, mixing at a speed of 400r / min for 10min, adding carbonizing agent, heating to 110°C, mixing at a speed of 400r / min for 10min, putting the materials in the hot mixer into cold mixing and cooling to 50°C to obtain a premix;

[0072] S3, putting the premix into a silo, conveying it to a twin-screw extruder, wherein the temperature of each temperature zone of the twin-screw extruder is 165° C. in zone 1, 175° C. in zone 2, 180° C. in zone 3, 180° C. in zone 4, 175° C. in zone 5, and the head temperature is 175° C., and melt extrusion is performed to obtain a melt;

[0073] S4. Put the melt into a mold, extrude and shape it through a three-roll calender, with the upper roll temperature being 120°C, the middle roll temperature being 100°C, and the lower roll temperature being 90°C. Shear and trim the edges to obtain a thermoplastic plate.

[0074] Example 3: An environmentally friendly and recyclable thermoplastic board for an aircraft interior table top in this example is prepared from the following components in parts by weight:

[0075] 100 parts of chlorinated polyvinyl chloride resin, 15 parts of acrylic resin, 6 parts of toughening flame retardant, 5 parts of composite stabilizer, 1.8 parts of internal lubricant, 2.2 parts of external lubricant, 25 parts of shell-core impact modifier, 2 parts of antioxidant, 2 parts of antistatic agent, 10 parts of masterbatch, 20 parts of carbonizing agent and 1.5 parts of anti-ultraviolet aging agent.

[0076] The composite stabilizer of this embodiment is composed of 2 parts of zeolite molecular sieve powder, 1 part of calcium stearate, 1 part of calcium citrate, 1 part of methyl tin mercaptan and 2 parts of dibutyl tin dilaurate.

[0077] The magnesium sulfate fiber of the toughened flame retardant of this embodiment has a crystal shape of 435 and an average length of 50 μm.

[0078] The core-shell impact modifier of the present embodiment is a polyacrylate-based core-shell impact modifier with an average particle size of 0.6 μm. The core-shell mass ratio of the core-shell impact modifier is 7:3.

[0079] The internal lubricant of this embodiment is glyceryl trihydroxystearate, the external lubricant is paraffin, the antioxidant is 1076, the antistatic agent is SN-62, the carbonizing agent is piperazine pyrophosphate, and the anti-ultraviolet aging agent is UV-326.

[0080] The method for preparing an environmentally friendly and recyclable thermoplastic board for an aircraft interior table top in this embodiment comprises the following steps:

[0081] S1. Weigh the required raw materials, dry them and pack them into bags for later use;

[0082] S2, adding chlorinated polyvinyl chloride resin, acrylic resin, masterbatch and composite stabilizer into a hot mixer, heating to 50°C, mixing at a speed of 500r / min for 10min, then adding internal lubricant and external lubricant into the hot mixer, heating to 80°C, mixing at a speed of 500r / min for 10min, adding shell-core anti-impact modifier, antioxidant, antistatic agent and anti-ultraviolet aging agent, continuing to mix and heating to 90°C, mixing at a speed of 500r / min for 10min, adding carbonizing agent, heating to 120°C, mixing at a speed of 500r / min for 10min, putting the materials in the hot mixer into cold mixing and cooling to 50°C to obtain a premix;

[0083] S3, putting the premix into a silo, conveying it to a twin-screw extruder, wherein the temperature of each temperature zone of the twin-screw extruder is 175°C in zone 1, 175°C in zone 2, 185°C in zone 3, 180°C in zone 4, 180°C in zone 5, and the head temperature is 180°C, and melt extrusion is performed to obtain a melt;

[0084] S4. Put the melt into a mold, extrude and shape it through a three-roll calender, with the upper roll temperature being 120°C, the middle roll temperature being 105°C, and the lower roll temperature being 100°C. Shear and trim the edges to obtain a thermoplastic plate.

[0085] Comparative Example 1: The difference between an environmentally friendly and recyclable thermoplastic board for an aircraft interior table top in this comparative example and Example 1 is that the composite stabilizer is replaced by calcium stearate and zinc stearate stabilizers.

[0086] Comparative Example 2: The difference between an environmentally friendly and recyclable thermoplastic board for an aircraft interior table top in this comparative example and Example 1 is that the toughening flame retardant is replaced by a magnesium hydroxide flame retardant.

[0087] Comparative Example 3: The difference between an environmentally friendly and recyclable thermoplastic board for an aircraft interior table top in this comparative example and Example 1 is that the core-shell impact modifier is replaced by an MBS impact modifier.

[0088] Performance Testing

[0089] The vertical burning performance of the thermoplastic plates prepared in various examples and comparative examples was tested at 12s and 60s according to FAR 25.853(a) standard.

[0090] The OSU heat release of the thermoplastic plates prepared in various examples and comparative examples was measured according to FAR 25.853(d) Part IV standard.

[0091] The NBS smoke density of the thermoplastic plates prepared in various examples and comparative examples was measured according to FAR 25.853(d) Part V standard.

[0092] The test results are shown in Table 1 below:

[0093] Table 1 Test results

[0094]

[0095] From the data in Table 1, it can be seen that the thermoplastic plates prepared in Examples 1 to 3 all passed the 12s and 60s vertical combustion tests, and the total heat release was 33.31 to 51.51 kw / m 2 The results show that the thermoplastic board prepared by the present invention has excellent flame retardant properties. The toughening flame retardant in Comparative Example 2 is replaced by magnesium hydroxide flame retardant, resulting in uneven dispersion of magnesium hydroxide in the thermoplastic board resin matrix, so it fails the 60s vertical combustion test, and the total heat release is 57.35kw / m 2 , which is greater than the total heat release specified in FAR 25.853 standard; the maximum smoke density of the thermoplastic plates prepared in Examples 1 to 3 is between 87 and 92 mm / sq cm, indicating that the thermoplastic plates prepared in the present invention have excellent smoke suppression performance.

[0096] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0097] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An environmentally friendly and recyclable thermoplastic board for aircraft interior table tops, characterized in that: It is prepared from the following ingredients in parts by weight: 90-100 parts of chlorinated polyvinyl chloride resin, 5-15 parts of acrylic resin, 3-6 parts of toughening flame retardant, 2-5 parts of composite stabilizer, 0.5-1.8 parts of internal lubricant, 0.2-2.5 parts of external lubricant, 10-30 parts of shell-core impact modifier, 0.5-2 parts of antioxidant, 0.5-2 parts of antistatic agent, 6-10 parts of masterbatch, 10-20 parts of carbonizing agent and 0.5-1.5 parts of anti-ultraviolet aging agent; The composite stabilizer is composed of 0.5 to 2 parts of zeolite molecular sieve powder, 1 to 2 parts of organic calcium stabilizer and 1 to 4 parts of organic tin stabilizer, the mass ratio of zeolite molecular sieve powder to organic tin stabilizer is 1:1 to 2, the organic calcium stabilizer is one or more combinations of calcium stearate, calcium laurate and calcium citrate, and the organic tin stabilizer is one or more combinations of methyl mercaptan tin, tin maleate and dibutyl tin dilaurate; the magnesium sulfate fiber crystal form of the toughening flame retardant is one or more combinations of 152, 153, 435, and the average length is 30 to 50 μm; the core-shell impact modifier is a polyacrylate-based core-shell impact modifier with an average particle size of 0.3 to 0.6 μm, and the core-shell mass ratio of the core-shell impact modifier is 7 to 8:2 to 3.

2. The environmentally friendly and recyclable thermoplastic board for aircraft interior table top according to claim 1, characterized in that: The internal lubricant is one or more combinations of polyethylene wax, trihydroxystearate, and ethylene bisstearamide; the external lubricant is one or more combinations of paraffin wax, Fischer-Tropsch wax, and stearic acid; the antioxidant is one or more combinations of 168, 608, 1010, and 1076; the antistatic agent is one or more combinations of FT-105, BYK-5128, and SN-62; the carbon-forming agent is one or more combinations of pentaerythritol, dipentaerythritol, and piperazine pyrophosphate; the anti-ultraviolet aging agent is one or more combinations of GW-540, UV-9, and UV-326.

3. The environmentally friendly and recyclable thermoplastic board for aircraft interior table top according to claim 1, characterized in that: The preparation method of the composite stabilizer comprises the following steps: S11. Add 2 to 3 parts of sodium aluminate and 8 to 9 parts of sodium silicate to 25 to 30 parts of deionized water, respectively, to prepare sodium aluminate solution and sodium silicate solution, then slowly add the sodium aluminate solution to the sodium silicate solution, add 3 to 5 parts of sodium hydroxide, crystallize at 80 to 90° C. for 10 to 12 hours, collect the solid by filtration, dry and grind to obtain zeolite molecular sieve powder; S12. Mix 0.5 to 2 parts of zeolite molecular sieve powder, 1 to 2 parts of organic calcium stabilizer, and 1 to 4 parts of organic tin stabilizer by mass to prepare a composite stabilizer.

4. The environmentally friendly and recyclable thermoplastic board for aircraft interior table top according to claim 3, characterized in that: The zeolite molecular sieve powder in the S11 has a silicon-aluminum ratio of 1.8-2, a sodium-silicon ratio of 1.6-1.8, and a water-sodium ratio of 50-60.

5. The environmentally friendly and recyclable thermoplastic board for aircraft interior table top according to claim 1, characterized in that: The preparation method of the toughened flame retardant comprises the following steps: S21. Add 5 to 10 parts of magnesium sulfate fiber by mass to 80 to 100 parts of deionized water, add citric acid to adjust the pH to 4 to 5, etch at 40 to 50° C. for 1 to 2 hours, wash with ethanol, add to deionized water for ultrasonic dispersion to form a dispersion with a concentration of 2 to 3 wt%, dissolve 10 to 15 parts of fatty acid in a mixed solution of ethanol and deionized water and add to the dispersion, stir at 40 to 60° C. at a speed of 2 to 4 hours, collect the solid and wash with ethanol, and dry at 40 to 60° C. to obtain surface-modified magnesium sulfate fiber; S22. Add 5 to 10 parts of surface modified magnesium sulfate fiber to 80 to 100 parts of deionized water by mass, disperse by ultrasonic, add 1 to 2 parts of carboxymethyl chitosan, stir evenly, condense and reflux at 120 to 130°C and stir for 12 to 18 hours, put the mixed solution into a centrifuge, centrifuge at a speed of 4000 to 5000 r / min for 10 to 15 minutes, collect the precipitate, wash it alternately with deionized water and anhydrous ethanol for 2 to 3 times, and dry it at a low temperature of 0 to 10°C to obtain a toughened flame retardant.

6. The environmentally friendly and recyclable thermoplastic board for aircraft interior table top according to claim 5, characterized in that: The fatty acid in S21 is one or more combinations of lauric acid, oleic acid, and capric acid, and the mass ratio of ethanol to deionized water in the mixed solution of ethanol and deionized water is 2-5:3-4.

7. The environmentally friendly and recyclable thermoplastic board for aircraft interior table top according to claim 1, characterized in that: The preparation method of the core-shell impact modifier comprises the following steps: S31. Add 100-200 parts of deionized water, 0.5-2 parts of emulsifier and 0.5-2 parts of electrolyte salt into a reactor by mass, stir at a speed of 200-300 r / min until the solid is completely dissolved, then add 5-10 parts of butyl acrylate and 1-3 parts of allyl methacrylate, introduce nitrogen, heat to 60-65° C., add 0.05-0.08 parts of ammonium persulfate, stir at a speed of 200-300 r / min, heat to 80-90° C. and react for 0.5-2h to obtain a seed emulsion; S32, by mass, adding 30 to 60 parts of butyl acrylate and 1 to 3 parts of allyl methacrylate to 100 to 200 parts of the seed emulsion, and adding 0.3 to 0.8 parts of ammonium persulfate, and polymerizing at 80 to 90° C. for 2 to 3 hours under a nitrogen atmosphere to obtain a latex; S33. To 90 to 100 parts of latex, add 15 to 30 parts of methyl methacrylate, 3 to 6 parts of 2-hydroxybutyl methacrylate and 0.1 to 0.2 parts of diethylaminoethyl methacrylate, add 0.1 to 0.5 parts of ammonium persulfate, raise the temperature to 80 to 90°C and keep it for 1 to 2 hours under the protection of nitrogen atmosphere, add excess ethanol to break the emulsion, wash with deionized water, and dry at 50 to 60°C to obtain a core-shell impact modifier.

8. The environmentally friendly and recyclable thermoplastic board for aircraft interior table top according to claim 1, characterized in that: The emulsifier in S31 is one or more combinations of sodium dodecyl sulfate, dodecyl polyoxyethylene ether, and block polyether, and the electrolyte is one or more combinations of sodium carbonate, potassium carbonate, and sodium bicarbonate.

9. A method for preparing an environmentally friendly and recyclable thermoplastic board for aircraft interior table tops, characterized in that: The steps include: S1. Weigh the required raw materials, dry them and pack them into bags for later use; S2, adding chlorinated polyvinyl chloride resin, acrylic resin, masterbatch and composite stabilizer into a hot mixer, heating to 50-60°C, mixing at a speed of 300-500r / min for 5-10min, then adding internal lubricant and external lubricant into the hot mixer, heating to 70-80°C, mixing at a speed of 300-500r / min for 5-10min, adding shell-core anti-impact modifier, antioxidant, antistatic agent and anti-ultraviolet aging agent, continuing to mix and heating to 90-100°C, mixing at a speed of 300-500r / min for 5-10min, adding carbonizing agent, heating to 110-120°C, mixing at a speed of 300-500r / min for 5-10min, putting the materials in the hot mixer into cold mixing and cooling to 40-50°C to obtain a premix; S3, placing the premix into a silo, conveying the premix to a twin-screw extruder for melt extrusion to obtain a molten material; S4. Put the melt into a mold, extrude and shape it through a three-roll calender, and shear and trim to obtain a thermoplastic plate.

10. The method for preparing an environmentally friendly and recyclable thermoplastic board for aircraft interior table top according to claim 9, characterized in that: The temperatures of each temperature zone of the twin-screw extruder in S3 are set to 165-175°C for zone 1, 165-175°C for zone 2, 175-185°C for zone 3, 170-180°C for zone 4, 170-180°C for zone 5 and the head temperature is 170-180°C; the temperature of the upper roller of the three-roll calender in S4 is 100-120°C, the temperature of the middle roller is 90-110°C, and the temperature of the lower roller is 90-100°C.

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