CN107955201B - LED bulb lamp shell - Google Patents
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- CN107955201B CN107955201B CN201711240266.3A CN201711240266A CN107955201B CN 107955201 B CN107955201 B CN 107955201B CN 201711240266 A CN201711240266 A CN 201711240266A CN 107955201 B CN107955201 B CN 107955201B
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Abstract
The invention relates to a shell, in particular to an LED bulb lamp shell, and belongs to the field of shell materials. The LED bulb lamp shell is made of a PA6/PET composite base material, the surface of the PA6/PET composite base material is coated with a flame-retardant coating, and the flame-retardant coating specifically comprises the following components in parts by weight: modified urea-formaldehyde resin: 90-100 parts of ammonium polyphosphate: 15-20 parts of pentaerythritol: 12-15 parts of melamine: 5-10 parts of calcium carbonate: 2-5 parts of organic bentonite: 2-5 parts of nano cadmium sulfide: 2-5 parts. According to the invention, the urea-formaldehyde resin is modified by ethanol and sec-butyl alcohol, and the PA6/PET composite material is used as a matrix, so that the mechanical property and excellent thermal stability of the prepared LED bulb lamp shell can be ensured.
Description
Technical Field
The invention relates to a shell, in particular to an LED bulb lamp shell, and belongs to the field of shell materials.
Background
Today, energy is in short supply, people often encounter power failure or high electricity charge, which brings great inconvenience to life and operation, and particularly brings great influence and embarrassment on factories and other commercial lighting, thereby causing environmental pollution. The LED bulb lamp can solve the problem, has the advantages of energy conservation, attractiveness, convenience and the like, is very good in energy conservation and brightness, has very high cost performance, and has the specific power of 30-40W. However, as a light-emitting product, it is inevitable to consider its safety performance.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the LED bulb lamp shell with excellent flame retardant property.
The purpose of the invention is realized by the following technical scheme: the LED bulb lamp shell is made of a PA6/PET composite base material, the surface of the PA6/PET composite base material is coated with a flame-retardant coating, and the flame-retardant coating specifically comprises the following components in parts by weight: modified urea-formaldehyde resin: 90-100 parts of ammonium polyphosphate: 15-20 parts of pentaerythritol: 12-15 parts of melamine: 5-10 parts of calcium carbonate: 2-5 parts of organic bentonite: 2-5 parts of nano cadmium sulfide: 2-5 parts.
According to the invention, the flame-retardant coating is coated on the aluminum-plastic composite material, so that the prepared LED bulb lamp shell has flame-retardant property, and the performance of the prepared LED bulb lamp is ensured.
In the LED bulb lamp shell, the flame-retardant coating layer adopts modified urea-formaldehyde resin as a base material, and the modified urea-formaldehyde resin is modified by the following method: reacting formaldehyde and hexamethyltetramine at 40-50 ℃ for 2-3h, adding urea, heating to 90-95 ℃, adjusting pH to 7.8-8.0, carrying out heat preservation and reflux for 40-50min, adding ethanol and sec-butyl alcohol, adjusting pH to 4.5-6.0, and carrying out heat preservation and reflux for 60-70 min.
Wherein the mass of the hexamethyltetramine is 5-10% of the mass of the formaldehyde, the mass of the urea is 90-99% of the mass of the formaldehyde, the mass of the ethanol is 1.2-1.5% of the mass of the formaldehyde, and the mass of the sec-butyl alcohol is 0.8-1.1% of the mass of the formaldehyde.
The urea-formaldehyde resin is modified by ethanol and sec-butyl alcohol, etherification copolycondensation reaction can be carried out, and the association of hydrogen bonds exists in hydroxymethyl and carbonyl groups in the resin in water, so that the number of hydrophilic groups in the resin needs to be reduced within a certain range. In the urea resin modified by alcohol etherification, part of hydroxymethyl loses activity and does not generate association crosslinking, and meanwhile, the resin obtains a certain amount of alkoxy, so that the polarity of the original molecule is reduced, and the water resistance and the aging resistance of the resin are improved.
In addition, the nano cadmium sulfide is added into the flame-retardant coating, so that the weight loss rate can be increased, the ammonium polyphosphate can be decomposed into phosphorus-containing compounds such as phosphoric acid or polyphosphoric acid, and the compounds can accelerate the dehydration and carbonization of the system, so that the carbon forming rate is improved, and the weight loss rate is reduced. Meanwhile, the addition of the nano cadmium sulfide promotes the release of nitrogen-containing gas, water vapor and other non-combustible gases, so that the carbon layer is further expanded, and the formed porous expansion type carbon foam layer is more obvious. However, if the amount of the nano cadmium sulfide is excessively increased, the amount of the formed carbon is increased, but the amount of the released gas is excessively increased, so that the gas is excessively released, and a dense carbon layer is partially broken by the flooding of a large amount of gas during the combustion process, thereby affecting the flame retardant effect.
In the LED bulb lamp shell, the PA6/PET composite base material specifically comprises the following components in parts by weight: PA 6: 80-85 parts of PET: 20-25 parts of 1, 4-butanediol diglycidyl ether: 8-14 parts of maleic anhydride grafted ethylene-octene copolymer: 8-14 parts of crystalline flake graphite: 5-10 parts of lanthanum borate: 5-10 parts.
In the LED bulb lamp shell, the PA6/PET composite material is used as a set, wherein compared with common plastics such as PE and PP, PA6 has the advantages of wide process temperature, excellent mechanical property, good thermal stability and the like, PET has the advantages of high thermal stability, weather resistance, size stability and the like, and the PA6 and PET are used as the matrix materials, so that the mechanical property and the excellent thermal stability of the prepared LED bulb lamp shell can be ensured.
In the LED bulb lamp shell, 1, 4-butanediol diglycidyl ether is added as a compatilizer, and 1, 4-butanediol diglycidyl ether is used as a micromolecular compound, so that the compound can be highly dispersed in a melt during melting reaction, the contact of reactive groups is greatly increased, and the reaction is sufficient; and the 1, 4-butanediol diglycidyl ether end group is a bifunctional epoxy structure, so that the ring opening is easier at high temperature, and the reaction degree is higher. Meanwhile, the alkyl chain length of the PA6 and PET polymer is increased after the 1, 4-butanediol diglycidyl ether reacts, so that the mechanical property of the obtained composite material can be improved.
In addition, the maleic anhydride grafted ethylene-octene copolymer is added into the shell of the LED bulb lamp, so that the interface of a mixture system has no smooth holes but a relatively fuzzy phase interface, and the maleic anhydride grafted ethylene-octene copolymer can be well attached to the copolymer system and has good phase interface bonding force, thereby realizing the toughening effect on PA6 and PET.
According to the invention, the flame retardant property of polystyrene can be effectively improved by adding a proper amount of nano lanthanum borate. The main reason is that the nano lanthanum borate generates a compact glassy oxygen-insulating layer on the surface of the polystyrene matrix material in the decomposition process of the composite material at high temperature, thereby blocking the exchange of combustible decomposers on the surface of the polymer and oxygen in the air and relieving the thermal decomposition rate of the composite material.
Preferably, the particle size of the nano lanthanum borate is 2-5 μm.
In the LED bulb lamp shell, the flake graphite is pretreated flake graphite, and the pretreatment specifically comprises the following steps: stirring and standing a coupling agent accounting for 0.8-1.0% of the weight of the crystalline flake graphite and isopropanol accounting for 1.0-1.2% of the weight of the crystalline flake graphite, putting the mixture and the crystalline flake graphite into a high-speed mixer, and reacting for 20-30min at 70-80 ℃.
Preferably, the coupling agent is a titanate coupling agent. The surface of the untreated crystalline flake graphite is hydrophilic and oleophobic and easy to agglomerate, and has poor compatibility with organic high polymers, so that poor interface bonding is easily caused, and the overall mechanical property of the material is reduced. Therefore, the invention treats the crystalline flake graphite and the aluminum oxide by a titanate coupling agent, wherein RO-groups in the titanate coupling agent are hydrolyzable short-chain alkoxy groups and can react with the hydroxyl on the surface of an inorganic substance, thereby achieving the purpose of chemical coupling. The coupled crystalline flake graphite has the advantages that the matrix is the polyester-polyamide blend, the blend contains a large number of terminal carboxyl groups, and the coupling agent reacts with matrix resin in the melt extrusion process, wherein the coupling agent can be used as a grafted part, so that the reinforcing effect on a chain section is obvious, and the mechanical property of the obtained composite material is improved.
In the LED bulb lamp shell, the flake graphite is subjected to coupling treatment, the flake graphite has a flake structure, and after the flake graphite is extruded through melting, the flake graphite can be peeled off once, so that the polymer chain end is reinforced, the system strength and rigidity are improved, and when the content of the flake graphite is too much, the flake graphite is easy to accumulate in a base body, the bonding force with the base body is weak, the tensile strength is suddenly reduced, and the rigidity is reduced. The flake graphite not only can greatly improve the heat conductivity, but also can improve the mechanical property. The interlayer spacing of the open layers of the sheets is obviously increased in the melt extrusion process, and the thermal conductivity of the composite material is gradually increased along with the increase of the mass fraction of the crystalline flake graphite. When the filling quality of the crystalline flake graphite is low, the crystalline flake graphite is highly dispersed in the matrix, the number of heat conduction channels formed by the powder is increased but the crystalline flake graphite is dispersed, when the mass fraction is continuously increased, the heat conduction channels are increased, the crystalline flake graphite is easy to form heat conduction networks with each other, and the heat conductivity is increased rapidly.
The invention also aims to provide a preparation method of the LED bulb lamp shell, which specifically comprises the following steps:
weighing the components of the PA6/PET composite base material, mixing PA6, PET and 1, 4-butanediol diglycidyl ether at normal temperature in a high-speed mixer, putting into an extruder for melt extrusion granulation, drying and performing injection molding to obtain a compatibilized copolymer;
then the prepared compatibilization copolymer and the maleic anhydride grafted ethylene-octene copolymer are placed in a high-speed mixer to be mixed at normal temperature, and then are put into an extruder to be melted, extruded and granulated, and then are dragged, granulated and dried to obtain the compatibilization and toughening copolymer;
mixing the compatibilization toughening copolymer, crystalline flake graphite and nano lanthanum borate in a high-speed mixer, putting the mixture into a double-screw extruder for traction and grain cutting, and drying in an oven to obtain a semi-finished product of the LED bulb lamp shell;
weighing raw materials of the flame-retardant coating, and uniformly dispersing by ultrasonic to obtain mixed flame-retardant slurry;
and coating the mixed flame-retardant slurry on the semi-finished product of the LED bulb lamp shell to obtain a finished product of the LED bulb lamp shell.
In the preparation method of the LED bulb lamp housing, the temperatures of the sections of the extruder are set to 180-.
In the preparation method of the LED bulb lamp shell, the temperatures of the sections of the injection molding machine are set to be 270-.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the urea-formaldehyde resin is modified by ethanol and sec-butyl alcohol, so that etherification copolycondensation reaction can be carried out, and the water resistance and aging resistance of the resin are improved;
2. according to the invention, the PA6/PET composite material is used as the matrix, wherein compared with general plastics such as PE and PP, PA6 has the advantages of wide process temperature, excellent mechanical property, good thermal stability and the like, PET has the advantages of higher thermal stability, weather resistance, size stability and the like, and the PA6 and PET are used as the matrix material, so that the mechanical property and excellent thermal stability of the prepared LED bulb lamp shell can be ensured.
3. According to the invention, the prepared finished product of the LED bulb lamp shell has good flame retardant effect by combining the flame retardant coating and the base material with reasonable compatibility and combining a specific preparation method.
Detailed Description
The following are specific embodiments of the present invention and further describe the technical solutions of the present invention, but the present invention is not limited to these examples.
Example 1
Weighing the components of the PA6/PET composite base material, mixing PA6, PET and 1, 4-butanediol diglycidyl ether at normal temperature for 5min in a high-speed mixer, putting into an extruder for melt extrusion granulation, drying and performing injection molding to obtain a compatibilized copolymer; the PA6/PET composite base material comprises the following components in parts by weight: PA 6: 80 parts, PET: 20 parts of 1, 4-butanediol diglycidyl ether: 8 parts of maleic anhydride grafted ethylene-octene copolymer: 8 parts, crystalline flake graphite: 5 parts of nano lanthanum borate: 5 parts of a mixture; the temperature of each section of the injection molding machine is set to be 270 ℃, 270 ℃ and 270-DEG C;
mixing the prepared compatibilization copolymer and the maleic anhydride grafted ethylene-octene copolymer in a high-speed mixer at normal temperature for 5min, putting the mixture into an extruder for melt extrusion granulation, and carrying out traction, grain cutting and drying to obtain the compatibilization toughening copolymer;
mixing the compatibilization toughening copolymer, crystalline flake graphite and nano lanthanum borate in a high-speed mixer, putting the mixture into a double-screw extruder for traction and grain cutting, and drying in an oven to obtain a semi-finished product of the LED bulb lamp shell; the grain size of the nanometer lanthanum borate is 2 mu m; the scale graphite is pretreated scale graphite, and the pretreatment specifically comprises the following steps: stirring and standing a coupling agent accounting for 0.8 percent of the mass of the crystalline flake graphite and isopropanol accounting for 1.0 percent of the mass of the crystalline flake graphite, putting the mixture and the crystalline flake graphite into a high-speed mixer, and reacting for 20min at 70 ℃; the temperature of each section of the double-screw extruder is set to be 180 ℃, 230 ℃, 260 ℃, 270 ℃ and 265 ℃;
weighing raw materials of the flame-retardant coating, and uniformly dispersing by ultrasonic to obtain mixed flame-retardant slurry; the flame-retardant coating specifically comprises the following components in parts by weight: modified urea-formaldehyde resin: 90 parts, ammonium polyphosphate: 15 parts of pentaerythritol: 12 parts, melamine: 5 parts, calcium carbonate: 2 parts of organic bentonite: 2 parts of nano cadmium sulfide: 2 parts of (1); the modified urea-formaldehyde resin is modified by the following method: reacting formaldehyde and hexamethyltetramine at 40 ℃ for 2h, adding urea, heating to 90 ℃, adjusting the pH to 7.8, carrying out heat preservation and reflux for 40min, adding ethanol and sec-butyl alcohol, adjusting the pH to 4.5, and carrying out heat preservation and reflux for 60 min; the mass of the hexamethyltetramine is 5% of the mass of the formaldehyde, the mass of the urea is 90% of the mass of the formaldehyde, the mass of the ethanol is 1.2% of the mass of the formaldehyde, and the mass of the sec-butyl alcohol is 0.8% of the mass of the formaldehyde;
and coating the mixed flame-retardant slurry on the semi-finished product of the LED bulb lamp shell to obtain a finished product of the LED bulb lamp shell.
Example 2
Weighing the components of the PA6/PET composite base material, mixing PA6, PET and 1, 4-butanediol diglycidyl ether at normal temperature for 6min in a high-speed mixer, putting into an extruder for melt extrusion granulation, drying and performing injection molding to obtain a compatibilized copolymer; the PA6/PET composite base material comprises the following components in parts by weight: PA 6: 81 parts, PET: 21 parts of 1, 4-butanediol diglycidyl ether: 9 parts of maleic anhydride grafted ethylene-octene copolymer: 89 parts of crystalline flake graphite: 6 parts of nano lanthanum borate: 6 parts of (1); the temperature of each section of the injection molding machine is set to 275 ℃, 275 ℃ and 275 ℃;
mixing the prepared compatibilization copolymer and the maleic anhydride grafted ethylene-octene copolymer in a high-speed mixer at normal temperature for 6min, putting the mixture into an extruder for melt extrusion granulation, and carrying out traction, grain cutting and drying to obtain the compatibilization toughening copolymer;
mixing the compatibilization toughening copolymer, crystalline flake graphite and nano lanthanum borate in a high-speed mixer, putting the mixture into a double-screw extruder for traction and grain cutting, and drying in an oven to obtain a semi-finished product of the LED bulb lamp shell; the grain size of the nanometer lanthanum borate is 3 mu m; the scale graphite is pretreated scale graphite, and the pretreatment specifically comprises the following steps: stirring and standing a coupling agent accounting for 0.85 percent of the mass of the crystalline flake graphite and isopropanol accounting for 1.05 percent of the mass of the crystalline flake graphite, putting the mixture and the crystalline flake graphite into a high-speed mixer, and reacting for 22min at 72 ℃; the temperature of each section of the double-screw extruder is set to 185 ℃, 235 ℃, 265 ℃, 275 ℃ and 270 ℃;
weighing raw materials of the flame-retardant coating, and uniformly dispersing by ultrasonic to obtain mixed flame-retardant slurry; the flame-retardant coating specifically comprises the following components in parts by weight: modified urea-formaldehyde resin: 92 parts, ammonium polyphosphate: 16 parts of pentaerythritol: 13 parts, melamine: 6 parts, calcium carbonate: 3 parts of organic bentonite: 3 parts of nano cadmium sulfide: 3 parts of a mixture; the modified urea-formaldehyde resin is modified by the following method: reacting formaldehyde and hexamethyltetramine at 43 ℃ for 2.2h, adding urea, heating to 91 ℃, adjusting pH to 7.85, carrying out heat preservation and reflux for 42min, adding ethanol and sec-butyl alcohol, adjusting pH to 4.7, and carrying out heat preservation and reflux for 62 min; the mass of the hexamethyltetramine is 6% of the mass of the formaldehyde, the mass of the urea is 92% of the mass of the formaldehyde, the mass of the ethanol is 1.3% of the mass of the formaldehyde, and the mass of the sec-butyl alcohol is 0.87% of the mass of the formaldehyde;
and coating the mixed flame-retardant slurry on the semi-finished product of the LED bulb lamp shell to obtain a finished product of the LED bulb lamp shell.
Example 3
Weighing the components of the PA6/PET composite base material, mixing PA6, PET and 1, 4-butanediol diglycidyl ether at normal temperature for 7min in a high-speed mixer, putting into an extruder for melt extrusion granulation, drying and performing injection molding to obtain a compatibilized copolymer; the PA6/PET composite base material comprises the following components in parts by weight: PA 6: 83 parts, PET: 23 parts of 1, 4-butanediol diglycidyl ether: 11 parts of maleic anhydride grafted ethylene-octene copolymer: 11 parts, crystalline flake graphite: 8 parts of nano lanthanum borate: 8 parts of a mixture; the temperature of each section of the injection molding machine is set to be 280 ℃, 280 ℃ and 280 ℃;
mixing the prepared compatibilization copolymer and the maleic anhydride grafted ethylene-octene copolymer in a high-speed mixer at normal temperature for 8min, putting the mixture into an extruder for melt extrusion granulation, and carrying out traction, grain cutting and drying to obtain the compatibilization toughening copolymer;
mixing the compatibilization toughening copolymer, crystalline flake graphite and nano lanthanum borate in a high-speed mixer, putting the mixture into a double-screw extruder for traction and grain cutting, and drying in an oven to obtain a semi-finished product of the LED bulb lamp shell; the grain size of the nanometer lanthanum borate is 3 mu m; the scale graphite is pretreated scale graphite, and the pretreatment specifically comprises the following steps: stirring and standing a coupling agent accounting for 0.9 percent of the mass of the crystalline flake graphite and isopropanol accounting for 1.1 percent of the mass of the crystalline flake graphite, putting the mixture and the crystalline flake graphite into a high-speed mixer, and reacting for 25min at 75 ℃; the temperature of each section of the double-screw extruder is set to 190 ℃, 240 ℃, 270 ℃, 280 ℃, and 272 ℃;
weighing raw materials of the flame-retardant coating, and uniformly dispersing by ultrasonic to obtain mixed flame-retardant slurry; the flame-retardant coating specifically comprises the following components in parts by weight: modified urea-formaldehyde resin: 95 parts of ammonium polyphosphate: 18 parts of pentaerythritol: 13 parts, melamine: 8 parts, calcium carbonate: 4 parts of organic bentonite: 4 parts of nano cadmium sulfide: 3 parts of a mixture; the modified urea-formaldehyde resin is modified by the following method: reacting formaldehyde and hexamethyltetramine at 45 ℃ for 2.5h, adding urea, heating to 93 ℃, adjusting the pH value to 7.9, carrying out heat preservation and reflux for 45min, adding ethanol and sec-butyl alcohol, adjusting the pH value to 5.3, and carrying out heat preservation and reflux for 65 min; the mass of the hexamethyltetramine is 8% of the mass of the formaldehyde, the mass of the urea is 95% of the mass of the formaldehyde, the mass of the ethanol is 1.35% of the mass of the formaldehyde, and the mass of the sec-butyl alcohol is 1.05% of the mass of the formaldehyde;
and coating the mixed flame-retardant slurry on the semi-finished product of the LED bulb lamp shell to obtain a finished product of the LED bulb lamp shell.
Example 4
Weighing the components of the PA6/PET composite base material, mixing PA6, PET and 1, 4-butanediol diglycidyl ether at normal temperature for 9min in a high-speed mixer, putting into an extruder for melt extrusion granulation, drying and performing injection molding to obtain a compatibilized copolymer; the PA6/PET composite base material comprises the following components in parts by weight: PA 6: 84 parts, PET: 24 parts of 1, 4-butanediol diglycidyl ether: 12 parts of maleic anhydride grafted ethylene-octene copolymer: 12 parts of crystalline flake graphite: 9 parts of nano lanthanum borate: 9 parts of (1); the temperature of each section of the injection molding machine is set to be 285 ℃, 285 ℃ and 285 ℃;
mixing the prepared compatibilization copolymer and the maleic anhydride grafted ethylene-octene copolymer in a high-speed mixer at normal temperature for 9min, putting the mixture into an extruder for melt extrusion granulation, and carrying out traction, grain cutting and drying to obtain the compatibilization toughening copolymer;
mixing the compatibilization toughening copolymer, crystalline flake graphite and nano lanthanum borate in a high-speed mixer, putting the mixture into a double-screw extruder for traction and grain cutting, and drying in an oven to obtain a semi-finished product of the LED bulb lamp shell; the grain size of the nanometer lanthanum borate is 4 mu m; the scale graphite is pretreated scale graphite, and the pretreatment specifically comprises the following steps: stirring and standing a coupling agent accounting for 0.95% of the mass of the crystalline flake graphite and isopropanol accounting for 1.15% of the mass of the crystalline flake graphite, putting the mixture and the crystalline flake graphite into a high-speed mixer, and reacting for 28min at 78 ℃; the temperature of each section of the double-screw extruder is set to be 195 ℃, 245 ℃, 275 ℃, 285 ℃ and 278 ℃;
weighing raw materials of the flame-retardant coating, and uniformly dispersing by ultrasonic to obtain mixed flame-retardant slurry; the flame-retardant coating specifically comprises the following components in parts by weight: modified urea-formaldehyde resin: 98 parts, ammonium polyphosphate: 18 parts of pentaerythritol: 14 parts of melamine: 8 parts, calcium carbonate: 4 parts of organic bentonite: 4 parts of nano cadmium sulfide: 4 parts of a mixture; the modified urea-formaldehyde resin is modified by the following method: reacting formaldehyde and hexamethyltetramine at 48 ℃ for 2.8h, adding urea, heating to 94 ℃, adjusting pH to 7.95, carrying out heat preservation and reflux for 48min, adding ethanol and sec-butyl alcohol, adjusting pH to 5.5, and carrying out heat preservation and reflux for 68 min; the mass of the hexamethyltetramine is 9% of that of the formaldehyde, the mass of the urea is 98% of that of the formaldehyde, the mass of the ethanol is 1.45% of that of the formaldehyde, and the mass of the sec-butyl alcohol is 1.0% of that of the formaldehyde;
and coating the mixed flame-retardant slurry on the semi-finished product of the LED bulb lamp shell to obtain a finished product of the LED bulb lamp shell.
Example 5
Weighing the components of the PA6/PET composite base material, mixing PA6, PET and 1, 4-butanediol diglycidyl ether at normal temperature for 10min in a high-speed mixer, putting into an extruder for melt extrusion granulation, drying and performing injection molding to obtain a compatibilized copolymer; the PA6/PET composite base material comprises the following components in parts by weight: PA 6: 85 parts, PET: 25 parts of 1, 4-butanediol diglycidyl ether: 14 parts of maleic anhydride grafted ethylene-octene copolymer: 14 parts of crystalline flake graphite: 10 parts of nano lanthanum borate: 10 parts of (A); the temperature of each section of the injection molding machine is set to 290 ℃, 290 ℃ and 290 ℃;
mixing the prepared compatibilization copolymer and the maleic anhydride grafted ethylene-octene copolymer in a high-speed mixer at normal temperature for 10min, putting the mixture into an extruder for melt extrusion granulation, and carrying out traction, grain cutting and drying to obtain the compatibilization toughening copolymer;
mixing the compatibilization toughening copolymer, crystalline flake graphite and nano lanthanum borate in a high-speed mixer, putting the mixture into a double-screw extruder for traction and grain cutting, and drying in an oven to obtain a semi-finished product of the LED bulb lamp shell; the grain size of the nanometer lanthanum borate is 5 mu m; the scale graphite is pretreated scale graphite, and the pretreatment specifically comprises the following steps: stirring and standing a coupling agent accounting for 1% of the mass of the crystalline flake graphite and isopropanol accounting for 1.2% of the mass of the crystalline flake graphite, putting the mixture and the crystalline flake graphite into a high-speed mixer, and reacting for 30min at 80 ℃; the temperature of each section of the double-screw extruder is set to be 200 ℃, 250 ℃, 280 ℃, 290 ℃ and 280 ℃;
weighing raw materials of the flame-retardant coating, and uniformly dispersing by ultrasonic to obtain mixed flame-retardant slurry; the flame-retardant coating specifically comprises the following components in parts by weight: modified urea-formaldehyde resin: 90-100 parts of ammonium polyphosphate: 20 parts of pentaerythritol: 15 parts, melamine: 10 parts, calcium carbonate: 5 parts of organic bentonite: 5 parts of nano cadmium sulfide: 5 parts of a mixture; the modified urea-formaldehyde resin is modified by the following method: reacting formaldehyde and hexamethyltetramine at 50 ℃ for 3h, adding urea, heating to 95 ℃, adjusting the pH value to 8.0, carrying out heat preservation and reflux for 50min, adding ethanol and sec-butyl alcohol, adjusting the pH value to 6.0, and carrying out heat preservation and reflux for 70 min; the mass of the hexamethyltetramine is 10% of the mass of the formaldehyde, the mass of the urea is 99% of the mass of the formaldehyde, the mass of the ethanol is 1.5% of the mass of the formaldehyde, and the mass of the sec-butyl alcohol is 1.1% of the mass of the formaldehyde;
and coating the mixed flame-retardant slurry on the semi-finished product of the LED bulb lamp shell to obtain a finished product of the LED bulb lamp shell.
Example 6
The difference from the embodiment 1 is only that the urea-formaldehyde resin is modified in the housing of the LED bulb lamp in the embodiment by a common modification method, and the rest is the same as that in the embodiment 1, and the description is omitted here.
Example 7
The difference from the embodiment 1 is only that a common base material is adopted in the housing of the LED bulb lamp of the embodiment, and the rest is the same as that of the embodiment 1, and the description is omitted here.
Example 8
The difference from the embodiment 1 is that crystalline flake graphite is not added into the housing of the LED bulb lamp in this embodiment, and the rest is the same as that in the embodiment 1, and is not described again here.
Example 9
The difference from the embodiment 1 is that nano lanthanum borate is not added into the housing of the LED bulb lamp in this embodiment, and the rest is the same as that in the embodiment 1, and the description is omitted here.
Example 10
The difference from the embodiment 1 is only that the crystalline flake graphite in the housing of the LED bulb lamp in the embodiment is not pretreated, and the rest is the same as that in the embodiment 1, and the description is omitted here.
Example 11
The difference from the embodiment 1 is only that the LED bulb lamp housing of the embodiment adopts a common preparation method, and the rest is the same as that of the embodiment 1, and is not described herein again.
Comparative example 1
The difference from the embodiment 1 is only that the housing of the LED bulb lamp of the comparative example is a common commercially available housing, and the rest is the same as that of the embodiment 1, and the description is omitted.
Comparative example 2
The difference from the example 1 is only that the shell of the LED bulb lamp of the comparative example adopts a common flame-retardant coating, and the rest is the same as the example 1, and the description is omitted.
Comparative example 3
The difference from the example 1 is that the urea-formaldehyde resin of the shell of the LED bulb lamp of the comparative example is not pretreated, and the rest is the same as the example 1, and the description is omitted.
The LED bulb lamp shells in the examples 1-11 and the comparative examples 1-3 are subjected to performance detection, and the detection results are shown in Table 1.
Measurement of flame retardancy:
the vertical burning test of 20mm is carried out according to UL standard 94, which UL standard 94 defines a test method for the flammability of plastic materials for parts in devices and equipment. The samples were subjected to a 20mm flame according to the specified test procedure. A blue flame was applied to the midpoint of the bottom edge of these samples in a concentration for three seconds. The flame is then withdrawn and the burn-out time is measured (t 1). The procedure is repeated and the burnout time is also measured (t 2). The sum of all burnout times T is accumulated and is also reported in table 1.
Table 1: detection results of shell performance of LED bulb lamps in examples 1-11 and comparative examples 1-3
The results show that the urea-formaldehyde resin is modified by the ethanol and the sec-butyl alcohol, so that etherification copolycondensation reaction can be carried out, and the water resistance and the aging resistance of the resin are improved; meanwhile, the PA6/PET composite material is used as the matrix, wherein compared with common plastics such as PE and PP, the PA6 has the advantages of wide process temperature, excellent mechanical property, good thermal stability and the like, and the PET has the advantages of high thermal stability, weather resistance, size stability and the like, and the PA6 and the PET are used as the matrix material, so that the mechanical property and the excellent thermal stability of the prepared LED bulb lamp shell can be ensured.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
While the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof.
Claims (6)
1. The LED bulb lamp shell is characterized by being made of a PA6/PET composite base material, the surface of the PA6/PET composite base material is coated with a flame-retardant coating, and the flame-retardant coating specifically comprises the following components in parts by weight: modified urea-formaldehyde resin: 90-100 parts of ammonium polyphosphate: 15-20 parts of pentaerythritol: 12-15 parts of melamine: 5-10 parts of calcium carbonate: 2-5 parts of organic bentonite: 2-5 parts of nano cadmium sulfide: 2-5 parts; the modified urea-formaldehyde resin is modified by the following method: reacting formaldehyde and hexamethyltetramine at 40-50 ℃ for 2-3h, adding urea, heating to 90-95 ℃, adjusting pH to 7.8-8.0, carrying out heat preservation and reflux for 40-50min, adding ethanol and sec-butyl alcohol, adjusting pH to 4.5-6.0, and carrying out heat preservation and reflux for 60-70 min; the PA6/PET composite base material comprises the following components in parts by weight: PA 6: 80-85 parts of PET: 20-25 parts of 1, 4-butanediol diglycidyl ether: 8-14 parts of maleic anhydride grafted ethylene-octene copolymer: 8-14 parts of crystalline flake graphite: 5-10 parts of nano lanthanum borate: 5-10 parts; the method is characterized in that the flake graphite is pretreated flake graphite, and the pretreatment specifically comprises the following steps: stirring and standing a coupling agent accounting for 0.8-1.0% of the weight of the crystalline flake graphite and isopropanol accounting for 1.0-1.2% of the weight of the crystalline flake graphite, putting the mixture and the crystalline flake graphite into a high-speed mixer, and reacting for 20-30min at 70-80 ℃.
2. The LED bulb lamp shell according to claim 1, wherein the mass of hexamethyltetramine is 5-10% of the mass of formaldehyde, the mass of urea is 90-99% of the mass of formaldehyde, the mass of ethanol is 1.2-1.5% of the mass of formaldehyde, and the mass of sec-butyl alcohol is 0.8-1.1% of the mass of formaldehyde.
3. The LED bulb lamp housing according to claim 1, wherein the nano lanthanum borate has a particle size of 2-5 μm.
4. The preparation method of the LED bulb lamp shell according to claim 1, wherein the preparation method specifically comprises the following steps:
weighing the components of the PA6/PET composite base material, mixing PA6, PET and 1, 4-butanediol diglycidyl ether at normal temperature in a high-speed mixer, putting into an extruder for melt extrusion granulation, drying and performing injection molding to obtain a compatibilized copolymer;
then the prepared compatibilization copolymer and the maleic anhydride grafted ethylene-octene copolymer are placed in a high-speed mixer to be mixed at normal temperature, and then are put into an extruder to be melted, extruded and granulated, and then are dragged, granulated and dried to obtain the compatibilization and toughening copolymer;
mixing the compatibilization toughening copolymer, crystalline flake graphite and nano lanthanum borate in a high-speed mixer, putting the mixture into a double-screw extruder for traction and grain cutting, and drying in an oven to obtain a semi-finished product of the LED bulb lamp shell;
weighing raw materials of the flame-retardant coating, and uniformly dispersing by ultrasonic to obtain mixed flame-retardant slurry;
and coating the mixed flame-retardant slurry on the semi-finished product of the LED bulb lamp shell to obtain a finished product of the LED bulb lamp shell.
5. The method for preparing the LED bulb lamp housing as claimed in claim 4, wherein the temperatures of the sections of the twin-screw extruder are set at 180-.
6. The method for preparing the LED bulb lamp housing as claimed in claim 4, wherein the temperatures of the sections of the injection molding machine are set to 270-290 ℃, 270-290 ℃ and 270-290 ℃.
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