CN109705804B - High enthalpy value phase-change silica gel gasket and preparation method thereof - Google Patents
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Abstract
The invention discloses a high enthalpy phase change silica gel gasket and a preparation method thereof. The high enthalpy phase change silica gel gasket is prepared from the following components in percentage by mass: 10-25% of vinyl silicone oil, 50-85% of paraffin phase change microcapsule, 0.5-5% of cross-linking agent, 5-15% of flame retardant, 0.5-4% of adhesive, 2-6% of diluent, 0.01-0.04% of platinum catalyst and 0.005-0.02% of inhibitor; the sum of the mass percentages of the components is 100 percent. The high enthalpy phase change silica gel gasket has a wide phase change point at 25-70 ℃ and a high enthalpy phase change value of more than 100-140J/g; the flame-retardant polyurethane foam material also has good flexibility and adhesiveness, and certain flame-retardant grade and insulativity; the phase-change material has the characteristics of good sealing performance, thermal shock resistance, long service life and the like.
Description
Technical Field
The invention relates to the field of heat management materials, in particular to a high-enthalpy phase-change silica gel gasket and a preparation method thereof.
Background
At present, with the development of microelectronic integration technology, 3C products such as computers, communications, and consumer electronics also show the trend of light, thin and miniaturized. The densification of semiconductor chips and electronic components has put higher demands on heat dissipation efficiency. Although traditional heat dissipation materials such as heat-conducting silica gel pads, heat-conducting silicone grease and the like have high heat conductivity coefficients, heat needs to be conducted out in time by means of heat pipes or metal sheets, so that the structure is complex, and the peak heat dissipation and temperature equalization effects are poor; in addition, the heat-conducting silicone grease has the risk of increased interface thermal resistance due to flowing and drying.
The phase change material is also called latent heat energy storage material, and is a functional material which utilizes the phase change of the material itself to passively absorb or release a large amount of heat from the surrounding environment, thereby achieving the purposes of storing heat and improving the energy utilization rate. In the low temperature field below 100 ℃, the paraffin organic phase change material attracts attention due to the advantages of wide phase change temperature range, high phase change latent heat, low price and easy acquisition of raw materials, and the like, but the paraffin organic phase change material has the problems of flowing and leakage after phase change melting. The phase change particles of the microcapsule-coated paraffin are microcapsule particles which take organic polymers such as melamine resin, phenolic resin, urea resin and the like as wall materials and take the phase change paraffin as a capsule core, can well solve the problem of phase change material leakage, and are safer and more stable latent heat energy storage materials.
The phase-change material has been gradually applied to the field of electronic communication due to the advantages of huge heat absorption and storage potential, good peak heat dissipation and temperature equalization effects, reversible heat conversion, green energy conservation, environmental protection and the like. However, the latent heat of phase change is one of the largest influencing factors restricting the application range, and a higher enthalpy value of phase change means larger heat absorption saturation, better peak heat dissipation and heat soaking effect, and is particularly suitable for heat dissipation of high-power intermittent working heat sources. In addition, the phase change material has certain requirements on flexibility, flame retardance, insulation and the like.
Suzhou Tianmai company mentions a heat-conducting silicon sheet taking octadecyl acrylate as a phase-change material in Chinese patent 201510727082.4, but the addition amount of the phase-change material is only 5-6%, the latent heat of phase change is very limited, and the difference between the heat-conducting silicon sheet and a pure heat-conducting silicon sheet is not great.
The preparation methods of the high-strength phase-change silica gel gasket and the phase-change hot melt adhesive sheet are respectively mentioned in Chinese patents 20170359357.2 and 201420215757.8 of Huadong Li worker university and Shenzhen prowa company. The phase-change film is prepared by adopting a pressure immersion or coating process, the viscosity of the system is required to be small, the addition amount of microcapsules is limited to a certain degree, and the latent heat of phase change is less than 110J/g; in addition, the phase-change films need to be supported by mesh cloth or copper foil to achieve certain strength so as to be convenient to apply, but the phase-change films are all deficient in the aspects of flame retardance, insulativity and the like.
In summary, the traditional heat dissipation materials such as the heat-conducting silica gel pad and the heat-conducting silicone grease and the existing phase-change energy storage materials have many defects in the field of heat management of 3C products such as computers, communication and consumer electronics, and cannot meet the application requirements of high-end markets.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a high enthalpy phase change silica gel gasket and a preparation method thereof, wherein the provided high enthalpy phase change silica gel gasket has a wider phase change point at 25-70 ℃ and a high enthalpy phase change value of more than 100-140J/g; the flame-retardant polyurethane foam material also has good flexibility and adhesiveness, and certain flame-retardant grade and insulativity; the phase-change material has the characteristics of good sealing performance, thermal shock resistance, long service life and the like.
The technical scheme of the invention is as follows:
the high enthalpy phase change silica gel gasket comprises the following components in percentage by mass: 10-25% of vinyl silicone oil, 50-85% of paraffin phase change microcapsule, 0.5-5% of cross-linking agent, 5-15% of flame retardant, 0.5-4% of adhesive, 2-6% of diluent, 0.01-0.04% of platinum catalyst and 0.005-0.02% of inhibitor; the sum of the mass percentages of the components is 100 percent.
Further, the vinyl silicone oil is one or more of methyl vinyl silicone oil and methyl phenyl vinyl silicone oil, and preferably methyl vinyl silicone oil (namely, terminal vinyl silicone oil) containing terminal vinyl with the viscosity of 3 thousand-10 ten thousand cP.
Further, the paraffin phase change microcapsule is microcapsule particles of styrene resin, melamine resin, phenolic resin or urea resin coated paraffin; the phase transition enthalpy value of the microcapsule particles is more than 160J/g, the phase transition point is 25-60 ℃, and the average particle size is 0.5-30 mu m.
Further, the cross-linking agent is one or more of hydrogen-terminated silicone oil and branched chain hydrogen-containing silicone oil, and the viscosity of the cross-linking agent is 2-300 cP.
Further, the flame retardant is one or more of aluminum hydroxide, magnesium hydroxide, titanium dioxide, acetylene black, quartz powder, zinc carbonate and chloroplatinic acid.
Still further, the flame retardant is titanium dioxide or zinc carbonate, and the particle size of the flame retardant is 0.1-5 μm.
Further, the adhesive is one or more of silane or siloxane oligomer containing alkoxy, hydrosilyl and reactive organic groups, borate, titanate and quaternary ammonium salt compounds.
Still further, the adhesive is any one of vinyltrimethoxysilane and gamma-glycidoxypropyltrimethoxysilane.
Further, the diluent is at least one of simethicone, monomethyltriethoxysilane and monomethyltriethoxysilane oligomer.
The invention relates to a preparation method of a high enthalpy phase change silica gel gasket, which comprises the following steps:
1) adding 40-60 wt% of vinyl silicone oil into a dispersion machine, then sequentially adding all the cross-linking agent, the flame retardant, the adhesive and the inhibitor, and fully and uniformly mixing to obtain component A silicone oil;
2) adding the rest vinyl silicone oil, all diluents and platinum catalyst into a dispersion machine, and fully and uniformly mixing to obtain B-component silicone oil;
3) respectively adding 50wt% of paraffin phase change microcapsules, the component A silicone oil and the component B silicone oil into a kneading machine to be kneaded for 6-10 min, and respectively obtaining A, B component rubber materials after fully and uniformly mixing;
4) kneading the A, B component rubber material in a kneading machine for 4-8 min, fully and uniformly mixing, vacuumizing and defoaming to obtain a liquid silica gel rubber material containing paraffin phase change microcapsules;
5) and rolling the liquid silica gel sizing material containing the paraffin phase change microcapsules in a calendar or die pressing to prepare a 0.2-2.0 mm rubber sheet, and vulcanizing at 110-130 ℃ for 15-60 min to obtain the high enthalpy phase change silica gel gasket.
Has the advantages that: in the invention, the high enthalpy phase change silica gel gasket has a wider phase change point at 25-70 ℃ and a high enthalpy phase change value of more than 100-140J/g; the flame-retardant polyurethane foam material also has good flexibility and adhesiveness, and certain flame-retardant grade and insulativity; the phase-change material has the characteristics of good sealing performance, thermal shock resistance, long service life and the like.
Detailed Description
The invention provides a high enthalpy phase-change silica gel gasket and a preparation method thereof, and the invention is further described in detail below in order to make the purpose, technical scheme and effect of the invention clearer and more clear. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the invention provides a high enthalpy phase change silica gel gasket, which is prepared from the following components in percentage by mass: 10-25% of vinyl silicone oil, 50-85% of paraffin phase change microcapsule, 0.5-5% of cross-linking agent, 5-15% of flame retardant, 0.5-4% of adhesive, 2-6% of diluent, 0.01-0.04% of platinum catalyst and 0.005-0.02% of inhibitor; the sum of the mass percentages of the components is 100 percent.
Compared with the prior art, the embodiment of the invention has the following advantages:
(1) the high enthalpy phase change silica gel gasket has a wider phase change point at 25-70 ℃, the filling amount of the paraffin phase change microcapsule is up to 50-85%, the phase change silica gel gasket is endowed with a high phase change enthalpy value of more than 100-140J/g, a large amount of heat can be stored in the phase change process, the environment temperature is ensured to be maintained near the phase change point, the peak heat dissipation and soaking effects are good, and the high enthalpy phase change silica gel gasket is particularly suitable for heat dissipation of a high-power intermittent working heat source;
(2) the paint has good flexibility, and the thickness can reach 0.20mm at the thinnest; the phase-change silica gel gasket has strong adhesion with metal and polymer, and is simple and convenient to apply; has a certain flame retardant grade; in addition, the phase-change silica gel gasket has higher surface resistivity and voltage breakdown resistance value and good insulating property;
(3) the phase-change microcapsule wall material is high molecular polymer resin with a three-dimensional reticular cross-linked structure and certain mechanical strength and toughness, and the phase-change material has good sealing property, cold and thermal shock resistance, safety, stability and long service life when undergoing phase-change melting.
In some embodiments, the vinyl silicone oil is any one or more of methyl vinyl silicone oil and methyl phenyl vinyl silicone oil, and preferably methyl vinyl silicone oil containing terminal vinyl group (i.e. terminal vinyl silicone oil) with viscosity of 3 thousand to 10 ten thousand cP. The phase change silica gel gasket is endowed with better flexibility by selecting the terminal vinyl silicone oil with medium and high viscosity of 3-10 ten thousand cP and a larger molecular weight and a crosslinking chain extension effect, and the thickness can reach 0.20mm at the thinnest.
In some embodiments, the paraffin phase-change microcapsule is a microcapsule particle coated with a styrene resin, a melamine resin, a phenolic resin, a urea resin and a modified resin high polymer thereof; the phase transition enthalpy value of the microcapsule particles is more than 160J/g, the phase transition point is 25-60 ℃, and the average particle size is 0.5-30 mu m.
In some embodiments, the cross-linking agent is one or more of hydrogen-terminated silicone oil and branched hydrogen-containing silicone oil, and the viscosity of the cross-linking agent is 2-300 cP. The terminal hydrogen silicone oil refers to a silicon-hydrogen bond at the chain end, and the branched chain hydrogen silicone oil refers to a silicon-hydrogen bond in the middle of a molecular chain.
In some embodiments, the flame retardant is an inorganic flame retardant, such as one or more of aluminum hydroxide, magnesium hydroxide, titanium dioxide, acetylene black, quartz powder, zinc carbonate, and chloroplatinic acid.
In some preferred embodiments, the flame retardant is titanium dioxide or zinc carbonate with high flame retardant efficiency, and the particle size of the flame retardant is 0.1-5 μm. The titanium dioxide or the zinc carbonate has higher flame retardant efficiency, and can endow the phase-change silica gel gasket with a certain flame retardant grade.
In some embodiments, the binder is one or more of an alkoxy, hydrosilyl, reactive organic group-containing silane or siloxane oligomer, borate, titanate, or quaternary ammonium compound.
In some preferred embodiments, the binder is a silane or siloxane oligomer containing a reactable organic group. The silane or siloxane adhesive containing the reaction functional group endows the phase-change silica gel gasket with stronger adhesiveness with metal and polymer, and the application is simple and convenient. In some more preferred embodiments, the binder is any one of vinyltrimethoxysilane and gamma-glycidoxypropyltrimethoxysilane.
In some embodiments, the diluent is at least one of dimethicone, monomethyltriethoxysilane oligomers.
The embodiment of the invention also provides a preparation method of the high enthalpy phase change silica gel gasket, which comprises the following steps:
1) adding 40-60 wt% of vinyl silicone oil into a dispersion machine, then sequentially adding all the cross-linking agent, the flame retardant, the adhesive and the inhibitor, and fully and uniformly mixing to obtain component A silicone oil;
2) adding the rest vinyl silicone oil, all diluents and platinum catalyst into a dispersion machine, and fully and uniformly mixing to obtain B-component silicone oil;
3) respectively adding 50wt% of paraffin phase change microcapsules, the component A silicone oil and the component B silicone oil into a kneading machine to be kneaded for 6-10 min, and respectively obtaining A, B component rubber materials after fully and uniformly mixing;
4) kneading the A, B component rubber material in a kneading machine for 4-8 min, fully and uniformly mixing, vacuumizing and defoaming to obtain a liquid silica gel rubber material containing paraffin phase change microcapsules;
5) and rolling the liquid silica gel sizing material containing the paraffin phase change microcapsules in a calendar or die pressing to prepare a 0.2-2.0 mm rubber sheet, and vulcanizing at 110-130 ℃ for 15-60 min to obtain the high enthalpy phase change silica gel gasket.
In the embodiment, the high enthalpy phase change silica gel gasket is prepared by A, B silicone oil components, A, B rubber materials, liquid silica gel rubber materials containing paraffin phase change microcapsules, rolling or compression molding and the like. The high enthalpy phase change silica gel gasket has a wide phase change point at 25-70 ℃ and a high phase change enthalpy value of more than 100-140J/g, can store a large amount of heat in the phase change process and ensure that the ambient temperature is maintained near the phase change point, has good peak heat dissipation and soaking effects, and is particularly suitable for heat dissipation occasions with high-power intermittent work; meanwhile, the phase-change material has the advantages of good flexibility and adhesiveness, certain flame retardant grade, good insulating property, good sealing property of the phase-change material, cold and thermal shock resistance, long service life and the like; and the preparation process is simple, and the preparation method has a good application prospect in the field of heat management in 3C industries such as computers, communication and consumer electronics.
The invention is further illustrated by the following specific examples.
In the embodiment of the invention, the melamine resin coated paraffin microcapsule is produced by Mitsubishi chemical industry, the weight ratio of the paraffin in the capsule core is 75-90%, the phase change enthalpy value of the microcapsule is 210J/g, the phase change point is 39 ℃, and the average particle size is 8 mu m; the microcapsule coated by the urea-formaldehyde resin is made in China, the weight ratio of the paraffin wax in the capsule core is 60-80%, the phase change enthalpy value of the microcapsule is 171J/g, the phase change point is 48 ℃, and the average particle size is 22 mu m.
The average particle size of the flame retardant titanium dioxide is 0.28 mu m, and the purity of the flame retardant titanium dioxide is 99.8 percent of rutile type titanium dioxide.
Example 1
The high enthalpy phase change silica gel gasket of this embodiment adopts the paraffin phase change microcapsule of the chemical production of mitsubishi of japan, and its raw materials composition is:
vinyl terminated Silicone oil (viscosity 6 ten thousand cP) 15.0g
Paraffin phase change microcapsule (melamine resin as wall material) 70.0g
Flame retardant-titanium dioxide 6.0g
Adhesive-gamma-glycidoxypropyltrimethoxysilane 2.0g
Diluent-Dimethicone (viscosity 100 cP) 3.0g
Cross-linking agent-Hydrogen terminated Silicone oil (viscosity 25 cP) 1.5g
Karster platinum catalyst (platinum effective content 300 ppm) 1.5g
Inhibitor-ethynl cyclohexanol (dimethicone solution with effective content of 5%) 1.0g
The preparation method of the high enthalpy phase change silica gel gasket in the embodiment is as follows:
1) adding 50wt% of terminal vinyl silicone oil, all terminal hydrogen silicone oil, a flame retardant, an adhesive and an inhibitor into a high-speed dispersion machine for mixing, stirring at the speed of 1000r/min for 15min, and fully and uniformly mixing to obtain component A silicone oil;
2) adding the rest 50wt% of vinyl-terminated silicone oil, all diluents and platinum catalyst into a high-speed dispersion machine for mixing, stirring at the speed of 1000r/min for 15min, and fully and uniformly mixing to obtain B-component silicone oil;
3) respectively adding 50wt% of paraffin phase change microcapsules, component A silicone oil and component B silicone oil into a kneader to be kneaded for 9min, wherein the kneading speed is 42r/min, the microcapsules are added for 3 times, about 1/3 is added each time, and after full and uniform mixing, A, B component rubber materials are respectively obtained;
4) finally kneading the A, B component rubber material in a kneader for 6min at the kneading speed of 42r/min, fully and uniformly mixing, vacuumizing and defoaming to obtain liquid silica gel rubber material containing paraffin phase-change microcapsules;
5) and (2) carrying out auxiliary forming by using a release film, rolling the liquid silica gel rubber material containing the paraffin phase change microcapsules on a 0.2mm rubber sheet on a three-roll calender at the rolling speed of 30cm/min, and then vulcanizing at 110 ℃ for 60min to obtain the high enthalpy phase change silica gel gasket.
Example 2
In this embodiment, the high enthalpy phase change silica gel pad is a transformation of embodiment 1, the vinyl silicone oil is terminal vinyl silicone oil with a viscosity of 5 kcp, the types and contents of the paraffin phase change microcapsule, the flame retardant and the adhesive are the same as those of embodiment 1, and the raw materials of the pad are as follows:
vinyl terminated Silicone oil (viscosity 5 thousand cP) 14.5g
Paraffin phase change microcapsule (melamine resin as wall material) 70.0g
Flame retardant-titanium dioxide 6.0g
Adhesive-gamma-glycidoxypropyltrimethoxysilane 2.0g
Diluent-Dimethicone (viscosity 100 cP) 2.0g
3.0g of hydrogen-terminated silicone oil (viscosity 25 cP) as a crosslinking agent
Karster platinum catalyst (platinum effective content 300 ppm) 1.5g
Inhibitor-ethynl cyclohexanol (dimethicone solution with effective content of 5%) 1.0g
The preparation method of the high enthalpy phase change silica gel gasket in this embodiment is the same as that in embodiment 1.
Example 3
The high enthalpy value phase change silica gel gasket of this embodiment adopts domestic paraffin phase change microcapsule, and its raw materials composition is:
vinyl terminated Silicone oil (viscosity 6 ten thousand cP) 24.0g
Paraffin phase change microcapsule (urea-formaldehyde resin as wall material) 60.0g
Flame retardant-titanium dioxide 6.0g
Adhesive-gamma-glycidoxypropyltrimethoxysilane 2.0g
Diluent-Dimethicone (viscosity 100 cP) 3.0g
2.5g of cross-linking agent-hydrogen terminated silicone oil (viscosity 25 cP)
Karster platinum catalyst (platinum effective content 300 ppm) 1.5g
Inhibitor-ethynl cyclohexanol (dimethicone solution with effective content of 5%) 1.0g
The preparation method of the high enthalpy phase change silica gel gasket in this embodiment is the same as that in embodiment 1.
Example 4
The phase-change silica gel gasket with high enthalpy value of the embodiment is a transformation of the embodiment 3, the vinyl silicone oil adopts terminal vinyl silicone oil with the viscosity of 5 kilocP, the types and the contents of the paraffin phase-change microcapsule, the flame retardant and the adhesive are kept unchanged from the embodiment 3, and the phase-change silica gel gasket comprises the following raw materials:
vinyl terminated silicone oil (viscosity 5 thousand cP) 20.5g
Paraffin phase change microcapsule (urea-formaldehyde resin as wall material) 60.0g
Flame retardant-titanium dioxide 6.0g
Adhesive-gamma-glycidoxypropyltrimethoxysilane 2.0g
Diluent-Dimethicone (viscosity 100 cP) 5.0g
Cross-linking agent-Hydrogen terminated Silicone oil (viscosity 25 cP) 4.0g
Karster platinum catalyst (platinum effective content 300 ppm) 1.5g
Inhibitor-ethynl cyclohexanol (dimethicone solution with effective content of 5%) 1.0g
In the preparation method of the high enthalpy phase change silica gel gasket, the preparation method of the liquid silica gel material containing the paraffin phase change microcapsule is similar to that of the embodiment 1; but because the rubber material is loose and has poor ductility, a 0.5mm phase-change silica gel gasket is prepared by adopting a mould pressing mode, the mould pressing pressure is 10MPa, the vulcanization is carried out for 60min at the temperature of 110 ℃, and then the high enthalpy value phase-change silica gel gasket is obtained by demoulding.
The performance test method of the high enthalpy phase change silica gel gasket in the embodiment of the invention comprises the following steps:
and (3) measuring a phase transformation point and an enthalpy value of phase transformation: the measuring temperature range is-20 to 100 ℃, the heating rate is 10 ℃/min, and the testing equipment is German relaxation-resistant DSC 204C.
And (3) testing the peel strength: according to GB/T2792-2014, the 180-degree peel strength of the adhesive sheet and the steel plate is tested according to a 180-degree peel strength test method of the pressure-sensitive adhesive tape.
And (3) testing the flame retardant property: according to the requirements specified in a silicone rubber flammability test in UL 94:2017, a V-0, V-1, V-2 vertical burning classification test and an HB horizontal burning test are carried out.
And (3) surface resistivity test: according to GB/T1410-2006, the volume resistivity and surface resistivity of solid insulating material are tested. Test voltage 100V, test time 60 s.
And (3) voltage resistance test: according to GB/T1408-2006, an insulating material electrical strength test method, the leakage current is 0.5mA, and the test time is 60 s.
And (3) cold-hot cycle testing: the circulation temperature is-40-85 ℃, the high temperature and the low temperature are kept for 15min, the temperature rising and falling time is 15min, the circulation frequency is 500 times, whether the phenomena of precipitation, wrinkle and powder change exist on the surface of the film after cold and hot circulation is observed, and whether the enthalpy value of phase change before and after comparison test is less than or equal to 10%.
The performance index parameters of the finished product of the high enthalpy phase change silica gel gasket prepared by the embodiments of the invention are shown in table 1.
TABLE 1 Properties of phase-change thermally conductive silicon pastes in examples
| Item | Example 1 | Example 2 | Example 3 | Example 4 |
| Tabletting process | Calendering | Calendering | Calendering | Die pressing |
| Film thickness (mm) | ≥0.2 | ≥0.2 | ≥0.3 | ≥0.5 |
| Phase transition Point (. degree. C.) | 38.9 | 38.5 | 48.2 | 48.0 |
| Enthalpy of phase change (J/g) | 146.6 | 145.8 | 102.2 | 102.9 |
| Peel strength (KN/m) | 0.62 | 0.67 | 0.91 | 0.84 |
| Flame retardant rating | UL94-HB | UL94-HB | UL94-V2 | UL94-V2 |
| Surface resistivity (omega) | 2.45*1014 | 4.63*1014 | 7.81*1014 | 9.02*1014 |
| DC Voltage resistance value (V/mm) | ＞6000 | ＞6000 | ＞6000 | ＞6000 |
| AC withstand voltage value (V/mm) | ＞5000 | ＞5000 | ＞5000 | ＞5000 |
| Whether cracking and powdering after cold-hot cycling | No precipitation, wrinkle and powdering | No precipitation, wrinkle and powdering | No precipitation, wrinkle and powdering | No precipitation, wrinkle and powdering |
| Enthalpy change rate of phase Change after Cold Heat cycle (%) | -5.9 | -5.4 | -8.8 | -8.2 |
In summary, compared with the prior art, the high enthalpy phase change silica gel gasket and the preparation method thereof provided by the invention have the following advantages: (1) the high enthalpy value phase change silica gel gasket has a wide phase change point at 25-70 ℃ and a high phase change enthalpy value of more than 100-140J/g, can store a large amount of heat in the phase change process and simultaneously ensure that the ambient temperature is maintained near the phase change point, has good peak heat dissipation and soaking effects, and is particularly suitable for heat dissipation of a high-power intermittent working heat source; (2) the paint has good flexibility, the thickness can reach 0.20mm at the thinnest, and the paint has strong adhesion with metal and polymers and is simple and convenient to apply; the flame retardant has a certain flame retardant grade, higher surface resistivity and voltage breakdown resistance value, and good insulating property; (3) the phase-change material is coated by microcapsule wall material resin with certain mechanical strength and toughness, and has the advantages of good sealing property, cold and thermal shock resistance, safety, stability and long service life when the phase-change melting occurs.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (5)
1. The high enthalpy phase change silica gel gasket is characterized by comprising the following components in percentage by mass: 10 to 25 percent of vinyl silicone oil, 50 to 85 percent of paraffin phase change microcapsule, 0.5 to 5 percent of cross-linking agent, 5 to 15 percent of flame retardant, 0.5 to 4 percent of adhesive, 2 to 6 percent of diluent, 0.01 to 0.04 percent of platinum catalyst and 0.005 to 0.02 percent of inhibitor; the sum of the mass percentages of the components is 100 percent;
the enthalpy value of the high enthalpy value phase change silica gel gasket is more than 100-140J/g; the viscosity of the vinyl silicone oil is 3-10 ten thousand cP; the vinyl silicone oil is any one or more of methyl vinyl silicone oil and methyl phenyl vinyl silicone oil; the flame retardant is one or more of aluminum hydroxide, magnesium hydroxide, titanium dioxide, acetylene black, quartz powder, zinc carbonate and chloroplatinic acid; the adhesive is any one of vinyl trimethoxy silane and gamma-glycidoxypropyl trimethoxy silane; the diluent is at least one of simethicone, methyltriethoxysilane and methyltriethoxysilane oligomer.
2. The high enthalpy phase change silica gel pad according to claim 1, wherein the paraffin phase change microcapsules are microcapsule particles of styrene resin, melamine resin, phenolic resin or urea resin coated paraffin; the phase transition enthalpy value of the microcapsule particles is more than 160J/g, the phase transition point is 25-60 ℃, and the average particle size is 0.5-30 mu m.
3. The high enthalpy value phase change silica gel gasket of claim 1, wherein the cross-linking agent is one or more of hydrogen-terminated silicone oil and branched chain hydrogen-containing silicone oil, and the viscosity of the cross-linking agent is 2-300 cP.
4. The high enthalpy phase change silica gel gasket of claim 1, wherein the flame retardant is titanium dioxide or zinc carbonate, and the particle size of the flame retardant is 0.1-5 μm.
5. The preparation method of the high enthalpy phase change silica gel gasket according to claim 1, comprising the steps of:
1) adding 40-60 wt% of vinyl silicone oil into a dispersion machine, then sequentially adding all the cross-linking agent, the flame retardant, the adhesive and the inhibitor, and fully and uniformly mixing to obtain component A silicone oil;
2) adding the rest vinyl silicone oil, all diluents and platinum catalyst into a dispersion machine, and fully and uniformly mixing to obtain B-component silicone oil;
3) respectively adding 50wt% of paraffin phase change microcapsules, the component A silicone oil and the component B silicone oil into a kneading machine to be kneaded for 6-10 min, and respectively obtaining A, B component rubber materials after fully and uniformly mixing;
4) kneading the A, B component rubber material in a kneading machine for 4-8 min, fully and uniformly mixing, vacuumizing and defoaming to obtain a liquid silica gel rubber material containing paraffin phase change microcapsules;
5) and rolling the liquid silica gel sizing material containing the paraffin phase change microcapsules in a calendar or die pressing to prepare a 0.2-2.0 mm rubber sheet, and vulcanizing at 110-130 ℃ for 15-60 min to obtain the high enthalpy phase change silica gel gasket.
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