A silicone foam sealing strip material for LED lamp and preparation method thereof

Abstract

The present invention relates to the technical field of sealing materials for LED lamps, and specifically discloses a silicone foam sealing strip material for LED lamps and a preparation method thereof. The raw materials of the above-mentioned silicone foam sealing strip material for LED lamps include, by mass, 100-150 parts of vinyl silicone oil, 5-15 parts of hydroxy silicone oil, 20-40 parts of hydrogen-containing silicone oil, 10-18 parts of polymethyl hydrogen siloxane, 1-3 parts of sodium bicarbonate, 1-2 parts of inhibitor, 10-20 parts of filler, 0.01-0.1 parts of catalyst, 1-3 parts of terminal ester polyamide-amine, 2-8 parts of trishydroxymethylaminomethane, 0.01-0.1 parts of anhydrous potassium carbonate, 5-10 parts of nano silicon dioxide, and 1-2 parts of terminal carboxyl polyamide-amine. The present invention also discloses a preparation method of the above-mentioned silicone foam sealing strip material for LED lamps.

Description

Technical Field

[0001] The invention relates to the technical field of sealing materials for LED lamps, and in particular to a silicone foaming sealing strip material for LED lamps and a preparation method thereof. Background Art

[0002] There are many types of LED lamp products on the market. With the rapid development of LED lighting and display technology, people's demand for LED light source modules is increasing.

[0003] Existing LED light sources can be sealed with potting glue to protect electronic components, but most of the glue on the market currently affects the performance of electronic components. LED light sources will also use a sealing strip structure, which is designed in the slot to cooperate with the product where the space size of the lamp is not restricted.

[0004] Silicone foam materials have the advantages of excellent compression and resilience, low water absorption and radiation resistance, and can be made into sealing strips for LED light sources. Silicone foam materials combine the characteristics of foam materials and silicone materials, and have excellent comprehensive performance compared to conventional polymer foam materials.

[0005] However, the silicone foam sealing strips currently on the market do not have sufficient cushioning and shock-absorbing performance, and cannot perform a good sealing function in low-temperature environments, which further limits their application. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a silicone foam sealing strip material for LED lamps and a preparation method thereof.

[0007] A silicone foam sealing strip material for LED lamps. The raw materials thereof include, by mass, 100-150 parts of vinyl silicone oil, 5-15 parts of hydroxy silicone oil, 20-40 parts of hydrogen-containing silicone oil, 10-18 parts of polymethyl hydrogen siloxane, 1-3 parts of sodium bicarbonate, 1-2 parts of inhibitor, 10-20 parts of filler, 0.01-0.1 parts of catalyst, 1-3 parts of terminal ester polyamide-amine, 2-8 parts of trishydroxymethylaminomethane, 0.01-0.1 parts of anhydrous potassium carbonate, 5-10 parts of nano silicon dioxide and 1-2 parts of terminal carboxyl polyamide-amine.

[0008] Preferably, the vinyl silicone oil is a double-terminal vinyl silicone oil with a viscosity of 2000-10000 mPa.s.

[0009] Preferably, the hydroxy silicone oil is a double-terminated hydroxyl-terminated silicone oil, and its viscosity is 1000-10000 mPa•s.

[0010] Preferably, the mass fraction of active hydrogen in the hydrogen-containing silicone oil is ≥1.5%.

[0011] Preferably, the viscosity of polymethylhydrogensiloxane at 25°C is 20-35 mm 2 / s, hydrogen content>1.62mol%.

[0012] Preferably, the inhibitor is ethynylcyclohexanol.

[0013] Preferably, the filler is at least one of white carbon black, calcium carbonate, talc, montmorillonite, mica powder, attapulgite, and zinc oxide whisker.

[0014] Preferably, the catalyst is a Custer platinum catalyst.

[0015] Preferably, the generation number of the ester-terminated polyamidoamine is 0.5 or 1.5, and the generation number of the carboxyl-terminated polyamidoamine is 1.0, 2.0 or 3.0.

[0016] The preparation method of the above LED lamp silicone foam sealing strip material comprises the following steps:

[0017] S1. Stir the vinyl silicone oil and filler evenly to obtain a prefabricated material. a ;

[0018] S2. Dissolve the terminal ester polyamide-amine in dimethyl sulfoxide and stir evenly. Under nitrogen protection, add tris(hydroxymethyl)aminomethane and anhydrous potassium carbonate, stir at 5-10°C for 1-2h, heat to 50-60°C and continue stirring for 10-30h, filter to remove the precipitate, and perform vacuum distillation to obtain a preform. b ;

[0019] S3, adding nano-silicon dioxide to water and stirring evenly, adjusting the pH value of the system to 4-5, adding carboxyl-terminated polyamide-amine thereto, stirring at 80-90° C. for 1-5 hours under nitrogen protection, filtering, washing, and vacuum drying to obtain a prefabricated material c ;

[0020] S4, to prefabricated material a Add prefabricated materials in sequence b , hydroxy silicone oil, hydrogen silicone oil, prefabricated materials c , polymethylhydrogensiloxane, sodium bicarbonate and inhibitor are stirred for 10-30 minutes, the catalyst is added and stirring is continued for 5-15 minutes, the sheet is calendered, foamed at 60-70°C for 10-20 minutes, and baked at 140-160°C for 1-2 hours.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention uses trishydroxymethylaminomethane to react with terminal ester polyamide-amine to obtain a prefabricated material. bIt not only has a dendritic molecular structure, but also has a very high affinity when compounded with hydroxy silicone oil. It further reacts with vinyl silicone oil and hydrogen-containing silicone oil to have a very high degree of crosslinking. At the same time, the end-carboxyl polyamide-amine is grafted on the surface of nano-silica to form crosslinking points in the crosslinked network structure, promote the mutual compatibility of the macromolecular structure, achieve energy loss when subjected to force, and improve tensile strength and modulus.

[0023] 2. The hydroxy silicone oil of the present invention condenses with the hydrogen-containing silicone oil to generate hydrogen, and the sodium bicarbonate is decomposed by heat to generate carbon dioxide, and the two cooperate to form a dense foam structure. b With prefabricated materials c It can significantly improve the compression rebound performance of the product, significantly enhance the sealing performance, and enhance the buffering and shock absorbing effect.

[0024] The test proves that the silicone foam sealing strip obtained by the present invention has excellent high and low temperature resistance and can work continuously in a low temperature environment of -40°C, thereby ensuring extremely strong sealing performance in a low temperature environment.

[0025] 3. The present invention not only has good adhesion, but also has excellent shock absorption performance, can maintain stable performance in various environments, and has excellent sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The figure is a comparison chart of the tensile strength and 100% tensile strength of the silicone foam sealing strips obtained in Example 5 and Comparative Examples 1-2.

[0027] Figure 2 This is a comparison chart of the tensile strength retention rate and 100% tensile strength retention rate of the silicone foam sealing strips obtained in Example 5 and Comparative Examples 1-2 after environmental aging treatment.

[0028] Figure 3 It is a comparison chart of the compression rate and rebound rate of the silicone foam sealing strip obtained in Example 5 and Comparative Examples 1-2. DETAILED DESCRIPTION

[0029] The present invention will be further explained below in conjunction with specific embodiments.

[0030] Example 1: A silicone foam sealing strip material for LED lamps, the raw materials of which include: 100 kg of double-terminal vinyl silicone oil with a viscosity of 2000-10000 mPa.s, 5 kg of double-terminal hydroxyl-terminated silicone oil with a viscosity of 1000-10000 mPa.s, 20 kg of hydrogen-containing silicone oil with an active hydrogen mass fraction of 1.5%, and a viscosity of 20-35 mm at 25 ° C. 2 / s, 10kg of polymethylhydrogensiloxane with a hydrogen content of 1.72mol%, 1kg of sodium bicarbonate, 1kg of ethynyl cyclohexanol, 10kg of white carbon black, 0.01kg of Custer platinum catalyst, 1kg of 0.5th generation terminal ester polyamide-amine, 2kg of trishydroxymethylaminomethane, 0.01kg of anhydrous potassium carbonate, 5kg of nano-silicon dioxide, and 1kg of 1.0th generation terminal carboxyl polyamide-amine.

[0031] The preparation method of the above LED lamp silicone foam sealing strip material comprises the following steps:

[0032] S1. Add double-ended vinyl silicone oil into a mixer, add white carbon black and stir evenly to obtain a prefabricated material. a ;

[0033] S2. Dissolve the terminal ester polyamide-amine in 10 kg of dimethyl sulfoxide and stir evenly. Under nitrogen protection, add tris(hydroxymethyl)aminomethane and anhydrous potassium carbonate, stir at 5°C for 1 hour, heat to 50°C, continue stirring for 10 hours, filter to remove the precipitate, and distill under reduced pressure to obtain a preform. b ;

[0034] S3, adding nano-silicon dioxide to 20kg of water and stirring evenly, adjusting the pH value of the system to 4-5, adding carboxyl-terminated polyamide-amine thereto, stirring at 80°C for 1h under nitrogen protection, filtering, washing with methanol, and vacuum drying to obtain a prefabricated material c ;

[0035] S4, to prefabricated material a Add prefabricated materials in sequence b , double-terminal hydroxyl-terminated silicone oil, hydrogen-containing silicone oil, prefabricated materials c , polymethylhydrogensiloxane, sodium bicarbonate, ethynyl cyclohexanol, stir at a speed of 100r / min for 10min, add Custer platinum catalyst, continue stirring for 5min, send to the calender for sheeting, foam at a temperature of 60℃ for 10min, and bake at a temperature of 140℃ for 1h.

[0036] Example 2: A silicone foam sealing strip material for LED lamps, the raw materials of which include: 150 kg of double-terminal vinyl silicone oil with a viscosity of 2000-10000 mPa.s, 15 kg of double-terminal hydroxyl-terminated silicone oil with a viscosity of 1000-10000 mPa.s, 40 kg of hydrogen-containing silicone oil with an active hydrogen mass fraction of 1.6%, and a viscosity of 20-35 mm at 25 ° C. 2 / s, 18kg of polymethylhydrogensiloxane with a hydrogen content of 1.65mol%, 3kg of sodium bicarbonate, 2kg of ethynyl cyclohexanol, 20kg of talc, 0.1kg of Custer platinum catalyst, 3kg of 1.5th generation terminal ester polyamide-amine, 8kg of trishydroxymethylaminomethane, 0.1kg of anhydrous potassium carbonate, 10kg of nano-silicon dioxide, and 2kg of 1.0th generation terminal carboxyl polyamide-amine.

[0037] The preparation method of the above LED lamp silicone foam sealing strip material comprises the following steps:

[0038] S1. Add double-ended vinyl silicone oil into a mixer, add talcum powder and stir evenly to obtain a prefabricated material. a ;

[0039] S2, dissolving the terminal ester polyamide-amine in 30 kg of dimethyl sulfoxide and stirring evenly, adding tris(hydroxymethyl)aminomethane and anhydrous potassium carbonate thereto under nitrogen protection, stirring at 10°C for 2 h, heating to 60°C, stirring for 30 h, filtering to remove the precipitate, and distilling under reduced pressure to obtain a preform b ;

[0040] S3, adding nano-silicon dioxide to 50kg of water and stirring evenly, adjusting the pH value of the system to 4-5, adding carboxyl-terminated polyamide-amine thereto, stirring at 90°C for 5h under nitrogen protection, filtering, washing with methanol, and vacuum drying to obtain a prefabricated material c ;

[0041] S4, to prefabricated material a Add prefabricated materials in sequence b , double-terminal hydroxyl-terminated silicone oil, hydrogen-containing silicone oil, prefabricated materials c , polymethylhydrogensiloxane, sodium bicarbonate, and ethynyl cyclohexanol, stir at a speed of 500r / min for 30min, add Custer platinum catalyst, continue stirring for 15min, send to the calender for sheeting, foam at a temperature of 70℃ for 20min, and bake at a temperature of 160℃ for 2h.

[0042] Example 3: A silicone foam sealing strip material for LED lamps, the raw materials of which include: 110 kg of double-terminal vinyl silicone oil with a viscosity of 2000-10000 mPa.s, 12 kg of double-terminal hydroxyl-terminated silicone oil with a viscosity of 1000-10000 mPa.s, 25 kg of hydrogen-containing silicone oil with an active hydrogen mass fraction of 1.65%, and a viscosity of 20-35 mm at 25 ° C. 2 / s, 16kg of polymethylhydrogensiloxane with a hydrogen content of 1.68mol%, 1.5kg of sodium bicarbonate, 1.7kg of ethynyl cyclohexanol, 10kg of montmorillonite, 2kg of zinc oxide whisker, 0.07kg of Custer platinum catalyst, 1.5kg of 0.5th generation terminal ester polyamide-amine, 6kg of trishydroxymethylaminomethane, 0.03kg of anhydrous potassium carbonate, 9kg of nano-silica, and 1.7kg of 3.0th generation terminal carboxyl polyamide-amine.

[0043] The preparation method of the above LED lamp silicone foam sealing strip material comprises the following steps:

[0044] S1. Add double-terminal vinyl silicone oil into a mixer, add montmorillonite and zinc oxide whisker and stir evenly to obtain a prefabricated material. a ;

[0045] S2, dissolving the terminal ester polyamide-amine in 15 kg of dimethyl sulfoxide and stirring evenly, adding tris(hydroxymethyl)aminomethane and anhydrous potassium carbonate thereto under nitrogen protection, stirring at 9° C. for 80 min, heating to 58° C., stirring for 15 h, filtering to remove the precipitate, and distilling under reduced pressure to obtain a preform b ;

[0046] S3, adding nano-silicon dioxide to 40kg of water and stirring evenly, adjusting the pH value of the system to 4-5, adding carboxyl-terminated polyamide-amine thereto, stirring at 82°C for 4h under nitrogen protection, filtering, washing with methanol, and vacuum drying to obtain a prefabricated material c ;

[0047] S4, to prefabricated material a Add prefabricated materials in sequence b , double-terminal hydroxyl-terminated silicone oil, hydrogen-containing silicone oil, prefabricated materials c , polymethylhydrogensiloxane, sodium bicarbonate, and ethynyl cyclohexanol, stir at a speed of 200r / min for 25min, add Custer platinum catalyst, continue stirring for 8min, send to a calender for sheeting, foam at a temperature of 66℃ for 12min, and bake at a temperature of 155℃ for 80min.

[0048] Example 4: A silicone foam sealing strip material for LED lamps, the raw materials of which include: 130 kg of double-terminal vinyl silicone oil with a viscosity of 2000-10000 mPa.s, 8 kg of double-terminal hydroxyl-terminated silicone oil with a viscosity of 1000-10000 mPa.s, 35 kg of hydrogen-containing silicone oil with an active hydrogen mass fraction of 1.5%, and a viscosity of 20-35 mm at 25 ° C. 2 / s, 12kg of polymethylhydrogensiloxane with a hydrogen content of 1.63mol%, 2.5kg of sodium bicarbonate, 1.3kg of ethynyl cyclohexanol, 9kg of calcium carbonate, 9kg of attapulgite, 0.03kg of Custer platinum catalyst, 2.5kg of 0.5th generation terminal ester polyamide-amine, 4kg of trishydroxymethylaminomethane, 0.07kg of anhydrous potassium carbonate, 7kg of nano-silica, and 1.3kg of 1.0th generation terminal carboxyl polyamide-amine.

[0049] The preparation method of the above LED lamp silicone foam sealing strip material comprises the following steps:

[0050] S1. Add double-ended vinyl silicone oil into a mixer, add calcium carbonate and attapulgite and mix well to obtain a prefabricated material. a ;

[0051] S2. Dissolve the terminal ester polyamide-amine in 25 kg of dimethyl sulfoxide and stir evenly. Under nitrogen protection, add tris(hydroxymethyl)aminomethane and anhydrous potassium carbonate, stir at 7°C for 100 min, heat to 52°C, continue stirring for 25 h, filter to remove the precipitate, and distill under reduced pressure to obtain a preform. b ;

[0052] S3, adding nano-silicon dioxide to 30kg of water and stirring evenly, adjusting the pH value of the system to 4-5, adding carboxyl-terminated polyamide-amine thereto, stirring at 88°C for 2h under nitrogen protection, filtering, washing with methanol, and vacuum drying to obtain a prefabricated material c ;

[0053] S4, to prefabricated material a Add prefabricated materials in sequence b , double-terminal hydroxyl-terminated silicone oil, hydrogen-containing silicone oil, prefabricated materials c , polymethylhydrogensiloxane, sodium bicarbonate, and ethynyl cyclohexanol, stir at a speed of 400r / min for 15min, add Custer platinum catalyst, continue stirring for 12min, send to a calender for sheeting, foam at a temperature of 64℃ for 18min, and bake at a temperature of 145℃ for 100min.

[0054] Example 5: A silicone foam sealing strip material for LED lamps, the raw materials of which include: 120 kg of double-terminal vinyl silicone oil with a viscosity of 2000-10000 mPa.s, 10 kg of double-terminal hydroxyl-terminated silicone oil with a viscosity of 1000-10000 mPa.s, 30 kg of hydrogen-containing silicone oil with an active hydrogen mass fraction of 1.5%, and a viscosity of 20-35 mm at 25 ° C. 2 / s, 14kg of polymethylhydrogensiloxane with a hydrogen content of 1.65mol%, 2kg of sodium bicarbonate, 1.5kg of ethynyl cyclohexanol, 6kg of white carbon black, 6kg of calcium carbonate, 3kg of zinc oxide whisker, 0.05kg of Custer platinum catalyst, 2kg of 0.5th generation terminal ester polyamide-amine, 5kg of trishydroxymethylaminomethane, 0.05kg of anhydrous potassium carbonate, 8kg of nano-silicon dioxide, and 1.5kg of 2.0th generation terminal carboxyl polyamide-amine.

[0055] The preparation method of the above LED lamp silicone foam sealing strip material comprises the following steps:

[0056] S1. Add double-ended vinyl silicone oil into a mixer, add white carbon black, calcium carbonate, and zinc oxide whisker and stir evenly to obtain a prefabricated material. a ;

[0057] S2, dissolving the terminal ester polyamide-amine in 20 kg of dimethyl sulfoxide and stirring evenly, adding tris(hydroxymethyl)aminomethane and anhydrous potassium carbonate thereto under nitrogen protection, stirring at 8°C for 90 min, heating to 55°C, stirring for 20 h, filtering to remove the precipitate, and distilling under reduced pressure to obtain a preform b ;

[0058] S3, adding nano-silicon dioxide to 35kg of water and stirring evenly, adjusting the pH value of the system to 4-5, adding carboxyl-terminated polyamide-amine thereto, stirring at 85°C for 3h under nitrogen protection, filtering, washing with methanol, and vacuum drying to obtain a prefabricated material c ;

[0059] S4, to prefabricated material a Add prefabricated materials in sequence b , double-terminal hydroxyl-terminated silicone oil, hydrogen-containing silicone oil, prefabricated materials c , polymethylhydrogensiloxane, sodium bicarbonate, and ethynyl cyclohexanol, stir at a speed of 300r / min for 20min, add Custer platinum catalyst, continue stirring for 10min, send to a calender for sheeting, foam at a temperature of 65℃ for 15min, and bake at a temperature of 150℃ for 90min.

[0060] Comparative Example 1

[0061] A silicone foam sealing strip material for LED lamps, the raw materials of which include: 120 kg of double-terminal vinyl silicone oil with a viscosity of 2000-10000 mPa.s, 10 kg of double-terminal hydroxyl-terminated silicone oil with a viscosity of 1000-10000 mPa.s, 30 kg of hydrogen-containing silicone oil with an active hydrogen mass fraction of 1.5%, and a viscosity of 20-35 mm at 25 ° C. 2 / s, 14kg of polymethylhydrogensiloxane with a hydrogen content of 1.65mol%, 2kg of sodium bicarbonate, 1.5kg of ethynyl cyclohexanol, 6kg of white carbon black, 6kg of calcium carbonate, 3kg of zinc oxide whisker, 0.05kg of Custer platinum catalyst, 2kg of 0.5th generation terminal ester polyamide-amine, 8kg of nano-silica, and 1.5kg of 2.0th generation terminal carboxyl polyamide-amine.

[0062] The preparation method of the above LED lamp silicone foam sealing strip material comprises the following steps:

[0063] S1. Add double-ended vinyl silicone oil into a mixer, add white carbon black, calcium carbonate, and zinc oxide whisker and stir evenly to obtain a prefabricated material. a ;

[0064] S2. Add nano-silicon dioxide to 35 kg of water and stir evenly, adjust the pH value of the system to 4-5, add carboxyl-terminated polyamide-amine thereto, stir at 85 ° C for 3 hours under nitrogen protection, filter, wash with methanol, and vacuum dry to obtain a prefabricated material b ;

[0065] S3, to prefabricated material a Add terminal ester polyamide-amine, double terminal hydroxyl-terminated silicone oil, hydrogen-containing silicone oil, prefabricated material in sequence b , polymethylhydrogensiloxane, sodium bicarbonate, and ethynyl cyclohexanol, stir at a speed of 300r / min for 20min, add Custer platinum catalyst, continue stirring for 10min, send to a calender for sheeting, foam at a temperature of 65℃ for 15min, and bake at a temperature of 150℃ for 90min.

[0066] Comparative Example 2

[0067] A silicone foam sealing strip material for LED lamps, the raw materials of which include: 120 kg of double-terminal vinyl silicone oil with a viscosity of 2000-10000 mPa.s, 10 kg of double-terminal hydroxyl-terminated silicone oil with a viscosity of 1000-10000 mPa.s, 30 kg of hydrogen-containing silicone oil with an active hydrogen mass fraction of 1.5%, and a viscosity of 20-35 mm at 25 ° C. 2 / s, 14kg of polymethylhydrogensiloxane with a hydrogen content of 1.65mol%, 2kg of sodium bicarbonate, 1.5kg of ethynyl cyclohexanol, 6kg of white carbon black, 6kg of calcium carbonate, 3kg of zinc oxide whisker, 0.05kg of Custer platinum catalyst, 2kg of 0.5th generation terminal ester polyamide-amine, 5kg of trishydroxymethylaminomethane, 0.05kg of anhydrous potassium carbonate, 8kg of nano-silicon dioxide, and 1.5kg of 2.0th generation terminal carboxyl polyamide-amine.

[0068] The preparation method of the above LED lamp silicone foam sealing strip material comprises the following steps:

[0069] S1. Add double-ended vinyl silicone oil into a mixer, add white carbon black, calcium carbonate, and zinc oxide whisker and stir evenly to obtain a prefabricated material. a ;

[0070] S2, dissolving the terminal ester polyamide-amine in 20 kg of dimethyl sulfoxide and stirring evenly, adding tris(hydroxymethyl)aminomethane and anhydrous potassium carbonate thereto under nitrogen protection, stirring at 8°C for 90 min, heating to 55°C, stirring for 20 h, filtering to remove the precipitate, and distilling under reduced pressure to obtain a preform b ;

[0071] S3, to prefabricated material a Add prefabricated materials in sequence b , double-terminal hydroxyl-terminated silicone oil, hydrogen-containing silicone oil, nano-silica, terminal carboxyl polyamide-amine, polymethyl hydrogen siloxane, sodium bicarbonate, and ethynyl cyclohexanol, stirred at 300r / min for 20min, added Custer platinum catalyst, continued stirring for 10min, sent to the calender for sheeting, foamed at 65℃ for 15min, and baked at 150℃ for 90min.

[0072] The tensile strength and 100% modulus of tensile strength of the silicone foam sealing strips obtained in Example 5 and Comparative Examples 1-2 were measured with reference to GB / T 528-2009 “Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber”.

[0073] like Figure 1 As shown, the tensile strength and 100% tensile strength of the silicone foam sealing strip obtained in Example 5 are the highest, which are better than those of Comparative Examples 1-2 (P < 0.05).

[0074] The silicone foam sealing strips obtained in Example 5 and Comparative Examples 1-2 were subjected to environmental aging treatment with reference to 5.20 thermal cycle test and 5.21 wet-cold test in GB / T 29595-2013 "Silicone rubber sealant for ground photovoltaic module sealing materials", and then the tensile strength and 100% elongation at modulus of the samples after aging treatment were measured with reference to GB / T 528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber", and the tensile strength and 100% elongation at modulus retention rate were calculated.

[0075] like Figure 2 As shown, the tensile strength and 100% tensile strength retention rate of the silicone foam sealing strip obtained in Example 5 after environmental aging treatment are the highest, which is better than that of Comparative Examples 1-2 (P < 0.05).

[0076] The compression rate and rebound rate of the silicone foam sealing strips obtained in Example 5 and Comparative Examples 1-2 were measured with reference to Test Method B in GB / T 12622-2008 “Test Method for Compression Rate and Rebound Rate of Gaskets for Pipe Flanges”.

[0077] like Figure 3 As shown, the compression rate of the silicone foam sealing strip obtained in Example 5 is the smallest, while the rebound rate is the highest, which is better than that of Comparative Examples 1-2 (P < 0.05), which proves that the silicone foam sealing strip obtained in Example 5 has a good sealing effect and can always fit the edge of the area to be sealed.

[0078] The applicant believes that this is because the present invention uses trishydroxymethylaminomethane to react with terminal ester polyamide-amine, and the resulting prefabricated material b It not only has a dendritic molecular structure, but also has a high affinity with hydroxy silicone oil. It further reacts with vinyl silicone oil and hydrogen silicone oil, and has a high degree of crosslinking. At the same time, the end-carboxyl polyamide-amine is grafted on the surface of nano-silicon dioxide to form crosslinking points in the crosslinked network structure, which promotes the mutual compatibility of the macromolecular structure, so that it can achieve energy loss when subjected to force, and improves tensile strength and modulus. Hydroxyl silicone oil condenses with hydrogen silicone oil to produce hydrogen, and sodium bicarbonate decomposes under heat to produce carbon dioxide, thereby forming a dense foam structure. At the same time, the prefabricated material is added b With prefabricated materials c It can significantly improve the compression rebound performance of the product, significantly enhance the sealing performance, and enhance the buffering and shock absorbing effect.

[0079] 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.

Claims

1. A silicone foam sealing strip material for LED lamps, characterized in that: The raw materials include, by mass: 100-150 parts of vinyl silicone oil, 5-15 parts of hydroxy silicone oil, 20-40 parts of hydrogen-containing silicone oil, 10-18 parts of polymethyl hydrogen siloxane, 1-3 parts of sodium bicarbonate, 1-2 parts of inhibitor, 10-20 parts of filler, 0.01-0.1 parts of catalyst, 1-3 parts of terminal ester polyamide-amine, 2-8 parts of trishydroxymethylaminomethane, 0.01-0.1 parts of anhydrous potassium carbonate, 5-10 parts of nano silicon dioxide, and 1-2 parts of terminal carboxyl polyamide-amine; Prepared by the following steps: S1. Stir the vinyl silicone oil and filler evenly to obtain a prefabricated material. a ; S2. Dissolve the terminal ester polyamide-amine in dimethyl sulfoxide and stir evenly. Under nitrogen protection, add tris(hydroxymethyl)aminomethane and anhydrous potassium carbonate, stir at 5-10°C for 1-2h, heat to 50-60°C and continue stirring for 10-30h, filter to remove the precipitate, and perform vacuum distillation to obtain a preform. b ; S3, adding nano-silicon dioxide to water and stirring evenly, adjusting the pH value of the system to 4-5, adding carboxyl-terminated polyamide-amine thereto, stirring at 80-90° C. for 1-5 hours under nitrogen protection, filtering, washing, and vacuum drying to obtain a prefabricated material c ; S4, to prefabricated material a Add prefabricated materials in sequence b , hydroxy silicone oil, hydrogen silicone oil, prefabricated materials c , polymethylhydrogensiloxane, sodium bicarbonate and inhibitor are stirred for 10-30 minutes, the catalyst is added and stirring is continued for 5-15 minutes, the sheet is calendered, foamed at 60-70°C for 10-20 minutes, and baked at 140-160°C for 1-2 hours.

2. The LED lamp silicone foam sealing strip material according to claim 1, characterized in that: Vinyl silicone oil is a double-ended vinyl silicone oil with a viscosity of 2000-10000 mPa.s.

3. The LED lamp silicone foam sealing strip material according to claim 1, characterized in that: Hydroxy silicone oil is a double-terminated hydroxyl-terminated silicone oil with a viscosity of 1000-10000mPa•s.

4. The LED lamp silicone foam sealing strip material according to claim 1, characterized in that: The mass fraction of active hydrogen in hydrogen-containing silicone oil shall be ≥1.5%.

5. The LED lamp silicone foam sealing strip material according to claim 1, characterized in that: The viscosity of polymethylhydrogensiloxane at 25°C is 20-35mm 2 / s, hydrogen content>1.62mol%.

6. The LED lamp silicone foam sealing strip material according to claim 1, characterized in that: The inhibitor was ethynylcyclohexanol.

7. The LED lamp silicone foam sealing strip material according to claim 1, characterized in that: The filler is at least one of white carbon black, calcium carbonate, talcum powder, montmorillonite, mica powder, attapulgite and zinc oxide whisker.

8. The LED lamp silicone foam sealing strip material according to claim 1, characterized in that: The catalyst is a Custer platinum catalyst.

9. The LED lamp silicone foam sealing strip material according to claim 1, characterized in that: The generation number of the ester-terminated polyamidoamine is 0.5 or 1.5, and the generation number of the carboxyl-terminated polyamidoamine is 1.0, 2.0 or 3.

0.

10. A method for preparing the silicone foam sealing strip material for LED lamps as claimed in any one of claims 1 to 9, characterized in that: The steps include: S1. Stir the vinyl silicone oil and filler evenly to obtain a prefabricated material. a ; S2. Dissolve the terminal ester polyamide-amine in dimethyl sulfoxide and stir evenly. Under nitrogen protection, add tris(hydroxymethyl)aminomethane and anhydrous potassium carbonate, stir at 5-10°C for 1-2h, heat to 50-60°C and continue stirring for 10-30h, filter to remove the precipitate, and perform vacuum distillation to obtain a preform. b ; S3, adding nano-silicon dioxide to water and stirring evenly, adjusting the pH value of the system to 4-5, adding carboxyl-terminated polyamide-amine thereto, stirring at 80-90° C. for 1-5 hours under nitrogen protection, filtering, washing, and vacuum drying to obtain a prefabricated material c ; S4, to prefabricated material a Add prefabricated materials in sequence b , hydroxy silicone oil, hydrogen silicone oil, prefabricated materials c , polymethylhydrogensiloxane, sodium bicarbonate and inhibitor are stirred for 10-30 minutes, the catalyst is added and stirring is continued for 5-15 minutes, the sheet is calendered, foamed at 60-70°C for 10-20 minutes, and baked at 140-160°C for 1-2 hours.

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