A kind of thermal insulation foam material and its preparation method and application

Abstract

The present invention provides a thermal insulation foam material and a preparation method and application thereof. The thermal insulation foam material of the present invention comprises raw materials including component A and component B. Under the joint action of the raw materials in component A and component B, a silicone rubber that can be formed by self-foaming can be finally obtained. The silicone rubber has good mechanical properties, uniform foaming, and good thermal insulation performance. The present invention also provides a preparation method and application of the thermal insulation foam material.

Description

Technical Field

[0001] The invention belongs to the technical field of foam materials, and in particular relates to a heat-insulating foam material and a preparation method and application thereof. Background Art

[0002] With the development and expansion of the e-cigarette industry market, the appearance and shape of e-cigarettes also tend to be miniaturized, compact and lightweight. The battery is an important component module of the e-cigarette. It will generate heat during the discharge and charging process, resulting in a bad user experience. The thermal insulation material can well isolate the heat transfer. E-cigarettes are prone to falling and colliding in daily use, causing damage to the battery, and the foam material can play a protective role. The lightweight foam material with thermal insulation performance has an excellent protective effect on the battery module of the e-cigarette.

[0003] Foamed silicone, also known as porous silicone rubber, silicone rubber foam or sponge silicone rubber, is a new type of material that combines the properties of silicone rubber and foam materials. It has the characteristics of relatively low density, good ability to absorb mechanical vibration or impact, better physiological properties, and stronger structural stability. More importantly, the heat resistance of silicone materials is better than that of general polymer materials. It can maintain its original performance for a long time below 200°C, and can even maintain a usage time ranging from several hours to dozens of hours above 250°C. It has excellent thermal stability.

[0004] In the related art, the preparation process of foamed silica gel usually adopts the high-temperature foaming method of a foaming agent or the high-temperature foaming method of self-foaming. The preparation process usually requires high temperature conditions and is relatively complicated. The obtained foamed silica gel has the disadvantages of insufficient mechanical properties and uneven foaming. Summary of the invention

[0005] The present invention aims to solve at least one of the above technical problems existing in the prior art. To this end, the present invention provides a thermal insulation foam material, which has better mechanical properties, simple preparation process and uniform foaming.

[0006] The invention also provides a method for preparing the heat-insulating foaming material.

[0007] The present invention also provides application of the heat-insulating foam material in electronic cigarettes.

[0008] The first aspect of the present invention provides a thermal insulation foam material, the raw materials for preparing the material include component A and component B;

[0009] The raw materials for preparing the A component include vinyl silicone oil, hydrogen-containing silicone oil A, hydroxy silicone oil, coupling agent, catalyst and filler, and the active hydrogen content of the hydrogen-containing silicone oil A is ≤0.1wt%;

[0010] The raw materials for preparing the B component include vinyl silicone oil, hydrogen-containing silicone oil B, hydroxy silicone oil, coupling agent, inhibitor and filler, and the active hydrogen content of the hydrogen-containing silicone oil B is ≥0.5wt%.

[0011] One of the technical solutions of the present invention regarding the thermal insulation foam material has at least the following beneficial effects:

[0012] The heat insulating foam material of the present invention is prepared from raw materials including component A and component B. Under the joint action of the raw materials in component A and component B, a silicone rubber that can be formed by self-foaming can be finally obtained. The silicone rubber has good mechanical properties, uniform foaming, and good heat insulating properties.

[0013] Among them, the raw materials for preparing component A include vinyl silicone oil, hydrogen-containing silicone oil A, hydroxy silicone oil, coupling agent, catalyst and filler. The active hydrogen content of the hydrogen-containing silicone oil A is ≤0.1wt%. The active hydrogen content of the hydrogen-containing silicone oil A is ≤0.1wt%. The purpose is to allow the silicone oil to be partially pre-cross-linked. If the active hydrogen content of the hydrogen-containing silicone oil A is greater than 0.1wt%, the silicone oil will be completely cross-linked and the next step cannot be carried out.

[0014] In component A, the role of vinyl silicone oil is to act as a base for the curing reaction and react with hydrogen-containing silicone oil.

[0015] The role of hydrogenated silicone oil A is to act as a pre-crosslinking agent to allow the silicone oil to be partially pre-crosslinked.

[0016] The role of hydroxy silicone oil is to cross-link with hydrogen silicone oil.

[0017] The role of the coupling agent is to act as a surface modifier, improve the dispersibility of the filler in the silicone oil, and enhance the overall performance of the foamed silicone rubber.

[0018] The role of the catalyst is to act as a catalyst to enable the reaction to proceed at room temperature.

[0019] The function of filler is to enhance the mechanical properties of the cured foamed silicone rubber.

[0020] The raw materials for preparing component B include vinyl silicone oil, hydrogen-containing silicone oil B, hydroxy silicone oil, coupling agent, inhibitor and filler, wherein the active hydrogen content of the hydrogen-containing silicone oil B is ≥0.5wt%. The active hydrogen content of the hydrogen-containing silicone oil B is ≥0.5wt%, so that the hydrogen-containing silicone oil B plays a role of crosslinking and foaming. If the active hydrogen content in the hydrogen-containing silicone oil is too low, the foaming effect cannot be achieved.

[0021] In component B, the role of the vinyl silicone oil is to act as a base for the curing reaction and react with the hydrogen-containing silicone oil.

[0022] The role of hydrogen silicone oil B is cross-linking and foaming.

[0023] The function of hydroxy silicone oil is to crosslink and foam with hydrogen-containing silicone oil.

[0024] The role of the coupling agent is to act as a surface modifier, improve the dispersibility of the filler in the silicone oil, and enhance the overall performance of the foamed silicone rubber.

[0025] The role of the inhibitor is to interact with the catalyst to delay and control the reaction time.

[0026] The function of filler is to enhance the mechanical properties of the cured foamed silicone rubber.

[0027] According to some embodiments of the present invention, the vinyl silicone oil includes terminal vinyl silicone oil and partial side chain vinyl silicone oil.

[0028] According to some embodiments of the present invention, the vinyl silicone oil is a vinyl-terminated silicone oil.

[0029] According to some embodiments of the present invention, the viscosity of the vinyl silicone oil is 1 Pa·s to 20 Pa·s.

[0030] The viscosity of vinyl silicone oil is 1Pa·s~20Pa·s. If it is less than 1Pa·s, the mechanical properties of the foamed silicone rubber will be poor after curing. If it is greater than 20Pa·s, the viscosity of components A and B will be too high before curing, which is not conducive to construction and use. Therefore, 1Pa·s~20Pa·s is the appropriate viscosity range of vinyl silicone oil.

[0031] According to some embodiments of the present invention, the coupling agent includes dodecyltrimethoxysilane.

[0032] According to some embodiments of the invention, the inhibitor comprises 1-ethynylcyclohexanol.

[0033] According to some embodiments of the present invention, the catalyst comprises platinum or a Custer catalyst.

[0034] According to some embodiments of the present invention, the filler includes silica powder, zinc oxide and fumed silica.

[0035] The fillers include silicon micropowder, zinc oxide and fumed silica, which increase the viscosity of the material before curing, so that the material does not flow during extrusion and pouring, and can achieve cross-linking and curing without passing through a mold. It can be cross-linked and cured directly in the scene where it is needed, with a wider range of uses and a simpler operation method during preparation.

[0036] According to some embodiments of the present invention, the preparation method of component A is: mixing the preparation raw materials except the filler in component A to perform a pre-crosslinking reaction to obtain pre-crosslinked silicone oil, and adding the filler to the pre-crosslinked silicone oil.

[0037] The raw materials except the filler in component A are mixed and pre-crosslinked to obtain pre-crosslinked silicone oil, and then the filler is added to the pre-crosslinked silicone oil. This pre-crosslinking method allows part of the silicone oil to be partially crosslinked before foaming and complete crosslinking, which meets the conditions for curing and crosslinking of the foamed silicone rubber at room temperature.

[0038] According to some embodiments of the present invention, the preparation method of component B is: mixing the preparation raw materials except the filler in component B to perform a pre-crosslinking reaction to obtain pre-crosslinked silicone oil, and adding the filler to the pre-crosslinked silicone oil.

[0039] The raw materials except the filler in component B are mixed and pre-crosslinked to obtain pre-crosslinked silicone oil, and then the filler is added to the pre-crosslinked silicone oil. This pre-crosslinking method allows part of the silicone oil to be partially crosslinked before foaming and complete crosslinking, which meets the conditions for curing and crosslinking of the foamed silicone rubber at room temperature.

[0040] According to some embodiments of the present invention, the A component includes the following components in parts by weight:

[0041] Vinyl silicone oil: 15 to 25 parts,

[0042] Hydrogenated silicone oil A: 0.5 to 5 parts,

[0043] Hydroxy silicone oil: 5 to 20 parts,

[0044] Coupling agent: 0.2 to 0.4 parts,

[0045] Catalyst: 0.1 to 0.3 parts,

[0046] Filler: 30 to 80 parts.

[0047] According to some embodiments of the present invention, the B component includes the following components in parts by weight:

[0048] Vinyl silicone oil: 15 to 25 parts,

[0049] Hydrogenated silicone oil B: 10 to 20 parts,

[0050] Hydroxy silicone oil: 5 to 15 parts,

[0051] Coupling agent: 0.2 to 0.4 parts,

[0052] Inhibitor: 0.05 to 0.2 parts,

[0053] Filler: 30 to 80 parts.

[0054] The second aspect of the present invention provides a method for preparing the thermal insulation foam material, which comprises: mixing the component A and the component B, extruding the mixture, and standing the mixture to solidify to obtain the thermal insulation foam material.

[0055] A technical solution in the method for preparing a thermal insulation foam material of the present invention has at least the following beneficial effects:

[0056] The existing foaming materials are unstable when cured and crosslinked at room temperature and need to be cured at high temperature. Therefore, the prepared foamed silicone has unstable performance and pores. In addition, the existing foaming materials have complex material preparation processes, low viscosity before curing, and can only be cured and formed under specific molds and conditions. Moreover, since the foamed silicone rubber is full of pores, the mechanical properties of the material are relatively low. In the preparation method of the thermal insulation foam material of the present invention, component A and component B are first pre-crosslinked. This pre-crosslinking method allows part of the silicone oil to be partially crosslinked before foaming and complete crosslinking, which meets the conditions for curing and crosslinking of the foamed silicone rubber at room temperature.

[0057] In the preparation method of the thermal insulation foam material of the present invention, the filler includes silicon micropowder, zinc oxide and fumed silica, which increases the viscosity of the material before curing, so that the material does not flow when extruded and poured out, and can achieve cross-linking and curing without going through a mold. It can be cross-linked and cured directly in the scene where it needs to be used, has a wider range of uses, and the operation method is simpler during preparation.

[0058] The preparation method of the heat-insulating foam material of the present invention can realize curing at room temperature, does not require expensive equipment and harsh reaction conditions, and is easy for industrial production.

[0059] According to some embodiments of the present invention, the temperature of static curing is 25°C to 35°C.

[0060] According to some embodiments of the present invention, the static curing time is 20 min to 120 min.

[0061] According to some embodiments of the present invention, the mixing mass ratio of component A to component B may be 1:1.

[0062] The third aspect of the present invention provides the use of the thermal insulation foam material in an electronic cigarette.

[0063] The application of the thermal insulation foam material in the electronic cigarette of the present invention has at least the following beneficial effects:

[0064] After the heat-insulating foam material of the present invention is used in electronic cigarettes, the electronic cigarettes also have all the technical effects of the heat-insulating foam material. Specifically:

[0065] The electronic cigarette of the present invention uses the heat-insulating foam material of the present invention, and the heat-insulating foam material has better mechanical properties and more uniform foaming, so that the service life of the electronic cigarette is longer and the customer experience is better. DETAILED DESCRIPTION

[0066] The following are specific embodiments of the present invention, and the technical solutions of the present invention are further described in conjunction with the embodiments, but the present invention is not limited to these embodiments.

[0067] In some embodiments of the present invention, the present invention provides a thermal insulation foam material, the preparation raw materials include component A and component B;

[0068] The raw materials for preparing component A include vinyl silicone oil, hydrogen-containing silicone oil A, hydroxy silicone oil, coupling agent, catalyst and filler, and the active hydrogen content of hydrogen-containing silicone oil A is ≤0.1wt%;

[0069] The raw materials for preparing component B include vinyl silicone oil, hydrogen-containing silicone oil B, hydroxy silicone oil, coupling agent, inhibitor and filler, and the active hydrogen content of hydrogen-containing silicone oil B is ≥0.5wt%.

[0070] It can be understood that the thermal insulation foam material of the present invention is prepared from raw materials including component A and component B. Under the joint action of the raw materials in component A and component B, a silicone rubber that can be formed by self-foaming can be finally obtained, and the silicone rubber has good mechanical properties and uniform foaming.

[0071] Among them, the raw materials for preparing component A include vinyl silicone oil, hydrogen-containing silicone oil A, hydroxy silicone oil, coupling agent, catalyst and filler. The active hydrogen content of hydrogen-containing silicone oil A is ≤0.1wt%. The active hydrogen content of hydrogen-containing silicone oil A is ≤0.1wt%. The purpose is to allow the silicone oil to be partially pre-cross-linked. If the active hydrogen content of hydrogen-containing silicone oil A is greater than 0.1wt%, the silicone oil will be completely cross-linked and the next step cannot be carried out.

[0072] In component A, the role of vinyl silicone oil is to act as a base for the curing reaction and react with hydrogen-containing silicone oil.

[0073] The role of hydrogenated silicone oil A is to act as a pre-crosslinking agent to allow the silicone oil to be partially pre-crosslinked.

[0074] The role of hydroxy silicone oil is to cross-link with hydrogen silicone oil.

[0075] The role of the coupling agent is to act as a surface modifier, improve the dispersibility of the filler in the silicone oil, and enhance the overall performance of the foamed silicone rubber.

[0076] The role of the catalyst is to act as a catalyst to enable the reaction to proceed at room temperature.

[0077] The function of filler is to enhance the mechanical properties of the cured foamed silicone rubber.

[0078] The raw materials for preparing component B include vinyl silicone oil, hydrogen-containing silicone oil B, hydroxy silicone oil, coupling agent, inhibitor and filler, and the active hydrogen content of hydrogen-containing silicone oil B is ≥0.5wt%. The active hydrogen content of hydrogen-containing silicone oil B is ≥0.5wt%, so that hydrogen-containing silicone oil B plays a role of crosslinking and foaming. If the active hydrogen content in hydrogen-containing silicone oil is too low, it cannot play a foaming role.

[0079] In component B, the role of the vinyl silicone oil is to act as a base for the curing reaction and react with the hydrogen-containing silicone oil.

[0080] The role of hydrogen silicone oil B is cross-linking and foaming.

[0081] The function of hydroxy silicone oil is to crosslink and foam with hydrogen-containing silicone oil.

[0082] The role of the coupling agent is to act as a surface modifier, improve the dispersibility of the filler in the silicone oil, and enhance the overall performance of the foamed silicone rubber.

[0083] The role of the inhibitor is to interact with the catalyst to delay and control the reaction time.

[0084] The function of filler is to enhance the mechanical properties of the cured foamed silicone rubber.

[0085] In some embodiments of the present invention, the vinyl silicone oil includes terminal vinyl silicone oil and part of side chain vinyl silicone oil.

[0086] In some embodiments of the present invention, the vinyl silicone oil is a vinyl-terminated silicone oil.

[0087] In some embodiments of the present invention, the viscosity of the vinyl silicone oil is 1 Pa·s to 20 Pa·s.

[0088] The viscosity of vinyl silicone oil is 1Pa·s~20Pa·s. If it is less than 1Pa·s, the mechanical properties of the foamed silicone rubber will be poor after curing. If it is greater than 20Pa·s, the viscosity of components A and B will be too high before curing, which is not conducive to construction and use. Therefore, 1Pa·s~20Pa·s is the appropriate viscosity range of vinyl silicone oil.

[0089] In some embodiments of the present invention, the catalyst comprises platinum or a Custer catalyst.

[0090] In some embodiments of the present invention, the filler includes silica powder, zinc oxide and fumed silica.

[0091] The fillers include silicon micropowder, zinc oxide and fumed silica, which increase the viscosity of the material before curing, so that the material does not flow during extrusion and pouring, and can achieve cross-linking and curing without passing through a mold. It can be cross-linked and cured directly in the scene where it is needed, with a wider range of uses and a simpler operation method during preparation.

[0092] In some embodiments of the present invention, the preparation method of component A is: mixing the preparation raw materials except the filler in component A to perform a pre-crosslinking reaction to obtain pre-crosslinked silicone oil, and adding the filler to the pre-crosslinked silicone oil.

[0093] The raw materials except the filler in component A are mixed and pre-crosslinked to obtain pre-crosslinked silicone oil, and then the filler is added to the pre-crosslinked silicone oil. This pre-crosslinking method allows part of the silicone oil to be partially crosslinked before foaming and complete crosslinking, which meets the conditions for curing and crosslinking of the foamed silicone rubber at room temperature.

[0094] In some embodiments of the present invention, the preparation method of component B is: mixing the preparation raw materials except the filler in component B to perform a pre-crosslinking reaction to obtain pre-crosslinked silicone oil, and adding the filler into the pre-crosslinked silicone oil.

[0095] The raw materials except the filler in component B are mixed and pre-crosslinked to obtain pre-crosslinked silicone oil, and then the filler is added to the pre-crosslinked silicone oil. This pre-crosslinking method allows part of the silicone oil to be partially crosslinked before foaming and complete crosslinking, which meets the conditions for curing and crosslinking of the foamed silicone rubber at room temperature.

[0096] In some embodiments of the present invention, component A includes the following components in parts by weight:

[0097] Vinyl silicone oil: 15 to 25 parts,

[0098] Hydrogenated silicone oil A: 0.5 to 5 parts,

[0099] Hydroxy silicone oil: 5 to 20 parts,

[0100] Coupling agent: 0.2 to 0.4 parts,

[0101] Catalyst: 0.1 to 0.3 parts,

[0102] Filler: 30 to 80 parts.

[0103] In some embodiments of the present invention, component B includes the following components in parts by weight:

[0104] Vinyl silicone oil: 15 to 25 parts,

[0105] Hydrogenated silicone oil B: 10 to 20 parts,

[0106] Hydroxy silicone oil: 5 to 15 parts,

[0107] Coupling agent: 0.2 to 0.4 parts,

[0108] Inhibitor: 0.05 to 0.2 parts,

[0109] Filler: 30 to 80 parts.

[0110] In some other embodiments of the present invention, the present invention provides a method for preparing a thermal insulation foam material, the method comprising: mixing component A and component B, extruding the mixture, and standing and curing the mixture to obtain the thermal insulation foam material.

[0111] It is understandable that the existing foaming materials are unstable when cured and crosslinked at room temperature and need to be cured at high temperature. Therefore, the prepared foamed silicone has unstable performance and pores. In addition, the existing foaming materials have complex material preparation processes, low viscosity before curing, and can only be cured and formed under specific molds and conditions. Moreover, since the foamed silicone rubber is full of pores, the mechanical properties of the material are relatively low. In the preparation method of the thermal insulation foam material of the present invention, component A and component B are first pre-crosslinked. This pre-crosslinking method allows part of the silicone oil to be partially crosslinked before foaming and complete crosslinking, which meets the conditions for curing and crosslinking of the foamed silicone rubber at room temperature.

[0112] It can also be understood that in the preparation method of the thermal insulation foam material of the present invention, the filler includes silicon micropowder, zinc oxide and fumed silica, which increases the viscosity of the material before curing, so that the material does not flow during extrusion and pouring, and can be cross-linked and cured without going through a mold. It can be cross-linked and cured directly in the scene where it is needed, has a wider range of uses, and the operation method is simpler during preparation.

[0113] The preparation method of the heat-insulating foam material of the present invention can realize curing at room temperature, does not require expensive equipment and harsh reaction conditions, and is easy for industrial production.

[0114] In some embodiments of the present invention, the temperature of static curing is 25°C to 35°C.

[0115] In some embodiments of the present invention, the mixing mass ratio of component A to component B is 1:1.

[0116] In some other embodiments of the present invention, the present invention provides the use of the thermal insulation foam material in an electronic cigarette.

[0117] It can be understood that after the heat-insulating foam material of the present invention is used in an electronic cigarette, the electronic cigarette also has all the technical effects of the heat-insulating foam material. Specifically:

[0118] The electronic cigarette of the present invention uses the heat-insulating foam material of the present invention, and the heat-insulating foam material has better mechanical properties and more uniform foaming, so that the service life of the electronic cigarette is longer and the customer experience is better.

[0119] The technical solution of the present invention will be better understood in conjunction with specific embodiments below.

[0120] Example 1

[0121] This embodiment prepares a thermal insulation foam material, specifically:

[0122] Preparation of component A:

[0123] (1) Take 23 parts of 10Pa·s vinyl-terminated silicone oil, 2 parts of 0.1% hydrogen-containing silicone oil, 15 parts of 4% hydroxy silicone oil, 0.3 parts of dodecyltrimethoxysilane, and 0.2 parts of 1000ppm Custer catalyst, and use a stirring degassing machine at a speed of 1300r / min for 3 minutes for pre-crosslinking.

[0124] (2) Add 20 parts of 1 μm spherical silica powder, 10 parts of 1 μm zinc oxide, and 20 parts of fumed silica to the pre-crosslinked silicone oil, and use a stirring degassing machine at a speed of 1300 r / min to stir in a vacuum for 5 minutes to disperse evenly, thereby obtaining component A.

[0125] Preparation of component B:

[0126] (1) Take 17 parts of 20Pa·s vinyl-terminated silicone oil, 13 parts of 0.8% hydrogenated silicone oil, 10 parts of 4% hydroxy silicone oil, 0.3 parts of dodecyltrimethoxysilane, and 0.1 parts of inhibitor. Use a stirring degassing machine at a speed of 1300r / min to stir for 3 minutes to disperse.

[0127] (2) Add 20 parts of 1 μm spherical silica powder, 10 parts of 1 μm zinc oxide, and 20 parts of fumed silica to the dispersed silicone oil, and use a stirring degassing machine at a speed of 1300 r / min to stir in a vacuum for 5 minutes to disperse evenly, thereby obtaining component B.

[0128] Curing:

[0129] Load equal amounts of components A and B into a 1:1 two-component rubber cartridge, extrude using a 17-section static mixer, and allow to cure at room temperature of 25°C for 60 minutes.

[0130] Example 2

[0131] This embodiment prepares a thermal insulation foam material, specifically:

[0132] Preparation of component A:

[0133] (1) Take 23 parts of 1Pa·s vinyl-terminated silicone oil, 2 parts of 0.1% hydrogenated silicone oil, 15 parts of 4% hydroxy silicone oil, 0.3 parts of dodecyltrimethoxysilane, and 0.2 parts of 1000ppm Custer catalyst, and use a stirring degassing machine at 1300r / min for 3 minutes for pre-crosslinking.

[0134] (2) Add 20 parts of 1 μm spherical silica powder, 10 parts of 1 μm zinc oxide, and 20 parts of fumed silica to the pre-crosslinked silicone oil, and use a stirring degassing machine at a speed of 1300 r / min to stir in a vacuum for 5 minutes to disperse evenly, thereby obtaining component A.

[0135] Preparation of component B:

[0136] (1) Take 17 parts of 5Pa·s vinyl-terminated silicone oil, 13 parts of 0.8% hydrogenated silicone oil, 10 parts of 4% hydroxy silicone oil, 0.3 parts of dodecyltrimethoxysilane, and 0.1 parts of inhibitor. Use a stirring degassing machine at 1300r / min to stir for 3 minutes to disperse.

[0137] (2) Add 20 parts of 1 μm spherical silica powder, 10 parts of 1 μm zinc oxide, and 20 parts of fumed silica to the dispersed silicone oil, and use a stirring degassing machine at a speed of 1300 r / min to stir in a vacuum for 5 minutes to disperse evenly, thereby obtaining component B.

[0138] Curing:

[0139] Load equal amounts of components A and B into a 1:1 two-component rubber cartridge, extrude using a 17-section static mixer, and allow to cure at room temperature of 25°C for 60 minutes.

[0140] Example 3

[0141] This embodiment prepares a thermal insulation foam material, specifically:

[0142] Preparation of component A:

[0143] (1) Take 23 parts of 10Pa·s vinyl-terminated silicone oil, 2 parts of 0.1% hydrogen-containing silicone oil, 15 parts of 4% hydroxy silicone oil, 0.3 parts of dodecyltrimethoxysilane, and 0.2 parts of 1000ppm Custer catalyst, and use a stirring degassing machine at a speed of 1300r / min for 3 minutes for pre-crosslinking.

[0144] (2) Add 20 parts of 1 μm spherical silica powder, 10 parts of 1 μm zinc oxide, and 20 parts of fumed silica to the pre-crosslinked silicone oil, and use a stirring degassing machine at a speed of 1300 r / min to stir in a vacuum for 5 minutes to disperse evenly, thereby obtaining component A.

[0145] Preparation of component B:

[0146] (1) Take 17 parts of 20Pa·s vinyl-terminated silicone oil, 13 parts of 0.8% hydrogenated silicone oil, 10 parts of 4% hydroxy silicone oil, 0.3 parts of dodecyltrimethoxysilane, and 0.1 parts of inhibitor. Use a stirring degassing machine at a speed of 1300r / min to stir for 3 minutes to disperse.

[0147] (2) Add 30 parts of 1 μm spherical silica powder, 15 parts of 1 μm zinc oxide, and 30 parts of fumed silica to the dispersed silicone oil, and use a stirring degassing machine at a speed of 1300 r / min to stir in a vacuum for 5 minutes to disperse evenly, thereby obtaining component B.

[0148] Curing:

[0149] Put equal amounts of components A and B into a 1:1 two-component rubber cartridge, extrude using a 17-section static mixer, and allow to cure at room temperature. The curing temperature is 25°C and the curing time is 60 minutes.

[0150] Comparative Example 1

[0151] This comparative example prepares a thermal insulation foam material, specifically:

[0152] Preparation of component A:

[0153] (1) Take 23 parts of 10Pa·s vinyl-terminated silicone oil, 2 parts of 0.1% hydrogen-containing silicone oil, 15 parts of 4% hydroxy silicone oil, 0.3 parts of dodecyltrimethoxysilane, and 0.2 parts of 1000ppm Custer catalyst. Use a stirring degassing machine at a speed of 1300r / min to stir in vacuum for 5 minutes for pre-crosslinking. Prepare component A.

[0154] Preparation of component B:

[0155] (1) Take 17 parts of 20Pa·s vinyl-terminated silicone oil, 13 parts of 0.8% hydrogenated silicone oil, 10 parts of 4% hydroxy silicone oil, 0.3 parts of dodecyltrimethoxysilane, and 0.1 parts of inhibitor. Use a stirring degassing machine at a speed of 1300 r / min and vacuum stir for 5 minutes to disperse evenly.

[0156] Curing:

[0157] Put equal amounts of components A and B into a 1:1 two-component rubber cartridge, extrude using a 17-section static mixer, and allow to cure at room temperature. The curing temperature is 25°C and the curing time is 60 minutes.

[0158] Comparative Example 2

[0159] This comparative example prepares a thermal insulation foam material, specifically:

[0160] Preparation of component A:

[0161] (1) Take 25 parts of 10Pa·s vinyl-terminated silicone oil, 15 parts of 4% hydroxy silicone oil, 0.3 parts of dodecyltrimethoxysilane, and 0.2 parts of 1000ppm Custer catalyst, and stir and disperse them at 1300r / min for 3 minutes using a stirring degassing machine.

[0162] (2) Add 20 parts of 1 μm spherical silica powder, 10 parts of 1 μm zinc oxide, and 20 parts of fumed silica to the dispersed silicone oil, and use a stirring degassing machine at a speed of 1300 r / min to stir in a vacuum for 5 minutes to disperse evenly, thereby obtaining component A.

[0163] Preparation of component B:

[0164] (1) Take 17 parts of 20Pa·s vinyl-terminated silicone oil, 13 parts of 0.8% hydrogen-containing silicone oil, 10 parts of 4% hydroxy silicone oil, 0.3 parts of dodecyltrimethoxysilane, and 0.1 parts of inhibitor. Use a stirring degassing machine at a speed of 1300 r / min to stir and disperse for 3 minutes.

[0165] (2) Add 20 parts of 1 μm spherical silica powder, 10 parts of 1 μm zinc oxide, and 20 parts of fumed silica to the dispersed silicone oil, and use a stirring degassing machine at a speed of 1300 r / min to stir in a vacuum for 5 minutes to disperse evenly, thereby obtaining component B.

[0166] Curing:

[0167] Put equal amounts of components A and B into a 1:1 two-component rubber cartridge, extrude using a 17-section static mixer, and allow to cure at room temperature. The curing temperature is 25°C and the curing time is 60 minutes.

[0168] In the above embodiments and comparative examples:

[0169] The percentage before hydrogen-containing silicone oil indicates the active hydrogen content. For example, "0.1% hydrogen-containing silicone oil" indicates hydrogen-containing silicone oil with an active hydrogen content of 0.1wt%, and "0.8% hydrogen-containing silicone oil" indicates hydrogen-containing silicone oil with an active hydrogen content of 0.8wt%.

[0170] The CAS number of vinyl-terminated silicone oil is 68083-19-2.

[0171] The CAS number of hydrogen silicone oil is 63148-57-2.

[0172] The CAS number of hydroxy silicone oil is 70131-67-8.

[0173] The coupling agent is dodecyltrimethoxysilane, CAS number is 3069-21-4.

[0174] The inhibitor is 1-ethynylcyclohexanol, CAS No. 78-27-3.

[0175] Performance Testing

[0176] The viscosity of the thermal insulation foam materials prepared in the examples and comparative examples before mixing and curing, and the hardness and mechanical properties after curing were tested.

[0177] The test is based on the following standards:

[0178] The viscosity test was carried out using the GB / T 2794 standard method.

[0179] The hardness test after curing was carried out using the ASTM D2240 standard method.

[0180] The mechanical properties after curing were tested using the GB / T 528 standard method.

[0181] The test results are shown in Table 1.

[0182] Table 1

[0183]

[0184] According to the test results in Table 1, it can be seen that compared with Examples 1, 2, and 3, Comparative Example 1 does not add fillers, and the viscosity before mixing and curing is much lower than that of Examples 1, 2, and 3; the tensile strength of the mechanical properties is also much lower than that of Examples 1, 2, and 3; it can be seen that the addition of fillers increases the viscosity of the foamed silicone rubber before mixing and curing, and can enhance its operability and controllability during the construction process; in addition, the addition of fillers also greatly improves the comprehensive mechanical properties of the foamed silicone rubber and improves the practicability of the foamed silicone rubber.

[0185] Compared with Examples 1, 2, and 3, the silicone oil of component A in Comparative Example 2 was not pre-crosslinked with hydrogen-containing silicone oil, and the viscosity before mixed curing was lower than that of Examples 1, 2, and 3; the tensile strength of the mechanical properties was also lower than that of Examples 1, 2, and 3; it can be seen that after pre-crosslinking, the silicone oil of component A significantly improved the mechanical properties of the foamed silicone rubber in addition to increasing the viscosity before mixed curing.

[0186] The heat insulating foam material of the present invention is prepared from raw materials including component A and component B. Under the joint action of the raw materials in component A and component B, a silicone rubber that can be formed by self-foaming can be finally obtained. The silicone rubber has good mechanical properties, uniform foaming, and good heat insulating properties.

[0187] It can be understood that when the thermal insulation foam material of the present invention is used in electronic cigarettes or other products, since the thermal insulation foam material has better mechanical properties and more uniform foaming, the service life of the electronic cigarette is longer and the customer experience is better.

[0188] The present invention has been described in detail above in conjunction with the embodiments, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A thermal insulation foam material, characterized in that: The preparation raw materials include component A and component B; The raw materials for preparing the A component include vinyl silicone oil, hydrogen-containing silicone oil A, hydroxy silicone oil, coupling agent, catalyst and filler, and the active hydrogen content of the hydrogen-containing silicone oil A is ≤0.1wt%; The raw materials for preparing the B component include vinyl silicone oil, hydrogen-containing silicone oil B, hydroxy silicone oil, coupling agent, inhibitor and filler, and the active hydrogen content of the hydrogen-containing silicone oil B is ≥0.5wt%; The A component includes the following components in parts by weight: Vinyl silicone oil: 15~25 parts, Hydrogenated silicone oil A: 0.5 to 5 parts, Hydroxy silicone oil: 5 to 20 parts, Coupling agent: 0.2~0.4 parts, Catalyst: 0.1~0.3 parts, Filler: 30~80 parts; The preparation method of the component A is as follows: the raw materials except the filler in the component A are mixed and subjected to a pre-crosslinking reaction to obtain a pre-crosslinked silicone oil, and the filler is added to the pre-crosslinked silicone oil; The B component includes the following components in parts by weight: Vinyl silicone oil: 15~25 parts, Hydrogenated silicone oil B: 10 to 20 parts, Hydroxyl silicone oil: 5 to 15 parts, Coupling agent: 0.2~0.4 parts, Inhibitor: 0.05~0.2 parts, Filler: 30~80 parts; The preparation method of the B component is: mixing the preparation raw materials except the filler in the B component to perform a pre-crosslinking reaction to obtain a pre-crosslinked silicone oil, and adding the filler into the pre-crosslinked silicone oil.

2. The thermal insulation foam material according to claim 1, characterized in that: The viscosity of the vinyl silicone oil is 1 Pa·s to 20 Pa·s.

3. The thermal insulation foam material according to claim 1, characterized in that: The catalyst includes platinum.

4. The thermal insulation foam material according to claim 1, characterized in that: The catalyst includes a Custer catalyst.

5. The thermal insulation foam material according to claim 1, characterized in that: The filler comprises silicon micropowder, zinc oxide and fumed silica.

6. A method for preparing the thermal insulation foam material according to any one of claims 1 to 5, characterized in that: The method comprises: mixing the component A and the component B evenly, extruding the mixture, and standing the mixture to solidify to obtain the heat insulating foam material.

7. Use of the thermal insulation foam material according to any one of claims 1 to 5 in electronic cigarettes.

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