A kind of rubber compound and its preparation method and application

Abstract

The present application discloses a rubber compound and its preparation method and application, and relates to the technical field of rubber compounds. The rubber compound comprises: a first cross-linked polymer, which is fluorosilicone rubber; and a second cross-linked polymer, wherein the monomer of the second cross-linked polymer comprises modified raw rubber, fumed silica, trishydroxymethylphosphine oxide and 2.4-dihydroxybenzophenone; wherein the structural formula of the modified raw rubber is as shown below: m is an integer of 20 to 100, and n is an integer of 1 to 10. The rubber compound provided by the present application has excellent mechanical properties, waterproof properties, anti-ultraviolet aging properties and flame retardant properties.

Description

Technical Field

[0001] The present application relates to the technical field of rubber compounds, and in particular to a rubber compound and a preparation method and application thereof. Background Art

[0002] Rubber mix is ​​a rubber compound obtained by mixing raw rubber or plastic rubber with compounding agents according to the formula in a rubber mixer. Rubber mix can be used as rubber mix due to its good waterproof performance. For example, in lamps, the use of suitable rubber mix can not only increase the service life of the lamps but also ensure their safety. Several types of commonly used rubber mix materials for lamps include rubber mix, silicone mix, and foamed polyurethane mix. However, rubber mix has poor weather resistance and is prone to aging and deformation; silicone mix has low strength and poor toughness; polyurethane mix has poor waterproof performance and poor hardness. These shortcomings have severely limited the application scenarios of various types of rubber mixes.

[0003] Therefore, it is necessary to develop a rubber compound material with excellent comprehensive properties. Summary of the invention

[0004] In view of this, the present application provides a rubber compound and a preparation method and application thereof.

[0005] The embodiment of the present application is implemented as follows: the embodiment of the present application provides a rubber compound, including:

[0006] a first cross-linked polymer, the first cross-linked polymer being fluorosilicone rubber; and

[0007] A second cross-linked polymer, wherein the components of the second cross-linked polymer include modified raw rubber, fumed silica, trishydroxymethylphosphine oxide and 2,4-dihydroxybenzophenone;

[0008] Among them, the structural formula of the modified raw rubber is shown as follows:

[0009] ;

[0010] m is an integer of 20-100, and n is an integer of 1-10.

[0011] Optionally, in some embodiments of the present application, the mass fraction of the first cross-linked polymer accounts for 20% to 30% of the total mass fraction of the first cross-linked polymer and the second cross-linked polymer; and / or

[0012] In the modified raw rubber, m is an integer of 40 to 80; and / or

[0013] In the modified raw rubber, n is an integer of 3 to 8; and / or

[0014] In the second cross-linked polymer, the mass ratio of the modified raw rubber, fumed silica, trihydroxymethylphosphine oxide and 2,4-dihydroxybenzophenone is (68-72): (8-15): (8-15): (3-5); and / or

[0015] The second cross-linked polymer is cross-linked by modified raw rubber, fumed silica, trishydroxymethylphosphine oxide and 2.4-dihydroxybenzophenone.

[0016] Optionally, in some embodiments of the present application, the rubber mix further includes a first catalyst;

[0017] The first catalyst includes sodium hydroxide;

[0018] In the rubber mix, the mass ratio of the modified raw rubber to the first catalyst is (68~72):(0.5~2);

[0019] The rubber compound consists of a first cross-linked polymer, a second cross-linked polymer and a first catalyst.

[0020] Accordingly, the present invention also provides a method for preparing a rubber compound, comprising the following steps:

[0021] A first cross-linked polymer and a modified raw rubber are provided, wherein the first cross-linked polymer is fluorosilicone rubber, and the structural formula of the modified raw rubber is as shown below:

[0022] ;

[0023] m is an integer from 20 to 100, and n is an integer from 1 to 10;

[0024] Providing fumed silica, trimethylolphosphine oxide and 2,4-dihydroxybenzophenone, mixing with raw rubber, and reacting to obtain a second cross-linked polymer; and

[0025] The first cross-linked polymer and the second cross-linked polymer are mixed to obtain a rubber compound.

[0026] Optionally, in some embodiments of the present application, the method for preparing the modified raw rubber comprises:

[0027] Providing a mixed solution, the mixed solution comprising hydroxy-terminated polydimethylsiloxane, polycaprolactone diol and a solvent;

[0028] Add 1,6-hexamethylene diisocyanate and 3-isocyanate propyltrimethoxysilane to the mixed solution for reaction to obtain modified raw rubber.

[0029] Optionally, in some embodiments of the present application, in the mixed solution, the molar concentration of the hydroxy-terminated polydimethylsiloxane is 0.05 mmol / g to 0.1 mmol / g; and / or

[0030] In the mixed solution, the molar concentration of polycaprolactone diol is 0.01 mmol / g to 0.05 mmol / g; and / or

[0031] In the mixed solution, the molar ratio of hydroxy-terminated polydimethylsiloxane to polycaprolactone diol is (5-10): (1-5); and / or

[0032] The solvent is selected from one or more of anhydrous tetrahydrofuran, chlorobenzene, diethylene glycol monobutyl ether, triethylene glycol monobutyl ether, diethylene glycol dimethyl ether, dimethyl sulfoxide, acetone, acetophenone, N,N-dimethylformamide, ethyl acetate, and pyrrole.

[0033] Optionally, in some embodiments of the present application, adding hexamethylene diisocyanate and 3-isocyanate propyltrimethoxysilane to the mixed solution comprises:

[0034] Add 1,6-hexamethylene diisocyanate to the mixed solution to react;

[0035] Then, 3-isocyanatepropyltrimethoxysilane was added and reacted.

[0036] Optionally, in some embodiments of the present application, the molar ratio of hydroxy-terminated polydimethylsiloxane to hexamethylene diisocyanate is (5-10): (8-12); and / or

[0037] The molar ratio of hydroxy-terminated polydimethylsiloxane to 3-isocyanatepropyltrimethoxysilane is (5-10): (1-3); and / or

[0038] The reaction temperature after adding hexamethylene diisocyanate is 50°C to 80°C, the reaction time is 2h to 5h, and the reaction atmosphere is an inert atmosphere; and / or

[0039] The reaction temperature after adding 3-isocyanatepropyltrimethoxysilane is 50°C~80°C, the reaction time is 1h~3h, and the reaction atmosphere is an inert atmosphere.

[0040] Optionally, in some embodiments of the present application, the mass ratio of modified raw rubber, fumed silica, trishydroxymethylphosphine oxide and 2.4-dihydroxybenzophenone is (68-72): (8-15): (8-15): (3-5); and / or

[0041] The mass fraction of the first cross-linked polymer accounts for 20% to 30% of the total mass fraction of the first cross-linked polymer and the second cross-linked polymer; and / or

[0042] The mixing reaction of fumed silica, trihydroxymethyl phosphorus oxide, 2.4-dihydroxybenzophenone and modified raw rubber includes: mixing; the mixing temperature is 100℃~150℃.

[0043] Correspondingly, the embodiments of the present application also provide the use of a rubber mix in a lamp seal, and the rubber mix is ​​the above-mentioned rubber mix, or is prepared by the above-mentioned preparation method of the rubber mix.

[0044] The rubber compound provided by the present application, the modified raw rubber adopts polydimethylsiloxane (PDMS) with excellent waterproof performance and high and low temperature resistance and polycaprolactone diol (HO-PCL-OH) with excellent mechanical properties as the basic building blocks of the rubber compound; the fumed silica with surface hydroxyl groups is used as a reinforcing filler, which synergizes with fluorosilicone rubber to simultaneously improve the mechanical strength and waterproof performance of the rubber compound; 2,4-dihydroxybenzophenone is used as a light stabilizer to improve the anti-ultraviolet aging performance of the rubber compound; trihydroxymethylphosphine oxide is used as a flame retardant and cross-linking agent to improve the flame retardant performance, tensile strength and resilience of the rubber compound. The modified raw rubber, fumed silica, trihydroxymethylphosphine oxide and 2.4-dihydroxybenzophenone are cross-linked and cured through a condensation reaction between abundant hydroxyl groups to obtain the rubber compound. Since each added component forms a stable chemical connection with the polymer molecular chain, the polymer and the filler have a strong interface bonding effect, and the prepared rubber compound has excellent mechanical properties, waterproof properties, anti-ultraviolet aging properties and flame retardant properties. Therefore, the rubber compound provided by the present invention is particularly used for waterproof sealing, such as waterproof sealing of lamps. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0046] Figure 1 It is a flow chart of a method for preparing a rubber compound provided in an embodiment of the present application. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application.

[0048] In this application, unless otherwise stated, directional words such as "upper" and "lower" generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inner" and "outer" refer to the outline of the device. In addition, in the description of this application, the term "including" means "including but not limited to". The terms first, second, third, etc. are used only as labels and do not impose numerical requirements or establish an order.

[0049] In this application, "and / or" describes the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural.

[0050] In this application, "at least one" means one or more, and "plurality" means two or more. "One or several", "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, "at least one of a, b, or c", or "at least one of a, b, and c" can all mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be single or multiple.

[0051] Various embodiments of the present application may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be understood as a rigid limitation on the scope of the present application; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numerical values ​​within the range. For example, the range description from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which apply regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0052] The structural formula and molecular weight of some chemical reagents used in this application are described as follows:

[0053] Hydroxyl-terminated polydimethylsiloxane (PDMS): , m represents the degree of polymerization, which is an integer from 20 to 100;

[0054] Polycaprolactone diol (HO-PCL-OH): , n is an integer from 1 to 10;

[0055] 1,6-Hexanediisocyanate (HDI): , molecular weight = 168.19;

[0056] 3-Isocyanatepropyltrimethoxysilane: , molecular weight = 205.28;

[0057] 2.4-Dihydroxybenzophenone: , molecular weight = 214.22;

[0058] Tris(hydroxymethyl)phosphine oxide: , molecular weight = 140.07;

[0059] Triethanolamine: , molecular weight = 149.19.

[0060] The technical solution of this application is as follows:

[0061] In a first aspect, an embodiment of the present application provides a rubber compound, comprising:

[0062] a first cross-linked polymer, the first cross-linked polymer being fluorosilicone rubber; and

[0063] A second cross-linked polymer, wherein monomers of the second cross-linked polymer include modified raw rubber, fumed silica, trishydroxymethylphosphine oxide and 2,4-dihydroxybenzophenone;

[0064] Among them, the structural formula of the modified raw rubber is shown as follows:

[0065] ;

[0066] m is an integer of 20-100, and n is an integer of 1-10.

[0067] It should be noted that in this application, = represents the degree of polymerization of -R- as x, in other words, x represents the number of monomer repeating units in the polymer chain. Similarly, Indicates the thermoplastic elastomer The number of repetitions is m, specifically 20~100.

[0068] The rubber compound provided by the present application, the modified raw rubber adopts polydimethylsiloxane (PDMS) with excellent waterproof performance and high and low temperature resistance and polycaprolactone diol (HO-PCL-OH) with excellent mechanical properties as the basic building blocks of the rubber compound; the fumed silica with surface hydroxyl groups is used as a reinforcing filler, which synergizes with fluorosilicone rubber to simultaneously improve the mechanical strength and waterproof performance of the rubber compound; 2,4-dihydroxybenzophenone is used as a light stabilizer to improve the anti-ultraviolet aging performance of the rubber compound; trihydroxymethylphosphine oxide is used as a flame retardant and cross-linking agent to improve the flame retardant performance, tensile strength and resilience of the rubber compound. The modified raw rubber, fumed silica, trihydroxymethylphosphine oxide and 2.4-dihydroxybenzophenone are cross-linked and cured through a condensation reaction between abundant hydroxyl groups to obtain the rubber compound. Since each added component forms a stable chemical connection with the polymer molecular chain, the polymer and the filler have a strong interface bonding effect, and the prepared rubber compound has excellent mechanical properties, waterproof properties, anti-ultraviolet aging properties and flame retardant properties.

[0069] In some embodiments, the mass fraction of the first cross-linked polymer accounts for 20% to 30% of the total mass fraction of the first cross-linked polymer and the second cross-linked polymer. In this way, both good hydrophobic properties and good mechanical properties can be obtained.

[0070] In some embodiments, in the modified raw rubber, m can be selected from an integer of 30 to 90, an integer of 40 to 80, an integer of 50 to 70, etc. Specifically, m can be 58, 62, 66, 75, 85, 88, 97, etc.

[0071] In some embodiments, in the modified raw rubber, n can be selected from an integer of 2 to 9, an integer of 3 to 8, an integer of 5 to 6, etc. Specifically, m can be 2, 3, 4, 5, 6, 7, etc.

[0072] In some embodiments, in the second cross-linked polymer, the mass ratio of the modified rubber, fumed silica, tris(hydroxymethyl)phosphine oxide and 2.4-dihydroxybenzophenone is (68-72):(8-15):(8-15):(3-5), for example, it can be 69:10:10:4, 70:12:12:4, 71:9:14:4, 70:11:13:4, etc. Within the mass ratio range, the modified rubber, fumed silica, tris(hydroxymethyl)phosphine oxide and 2.4-dihydroxybenzophenone can work synergistically to improve the mechanical properties, waterproof properties, UV aging resistance and flame retardant properties of the mixed rubber.

[0073] In some embodiments, the second cross-linked polymer is composed of modified raw rubber, fumed silica, trishydroxymethylphosphine oxide, and 2,4-dihydroxybenzophenone cross-linked.

[0074] In some embodiments, the rubber mix further includes a first catalyst. It is understood that during the preparation of the rubber mix, the first catalyst may be added to promote the cross-linking polymerization reaction of each monomer, and the first catalyst remains in the rubber mix after the reaction.

[0075] Further, the first catalyst includes sodium hydroxide.

[0076] In some embodiments, in the rubber mix, the mass ratio of the modified raw rubber to the first catalyst is (68-72): (0.5-2), for example, 69:0.8, 70:1, 71:1.2, 70:1.5, etc. Within the mass ratio range, the proportion of the first catalyst is appropriate, which can promote the cross-linking polymerization of each monomer and will not have an adverse effect on the rubber mix.

[0077] In some embodiments, the rubber compound consists of a first cross-linked polymer, a second cross-linked polymer, and a first catalyst.

[0078] Second, see Figure 1 The present application also provides a method for preparing a rubber compound, comprising the following steps:

[0079] S11, providing a first cross-linked polymer and raw rubber, wherein the first cross-linked polymer is fluorosilicone rubber, and the structural formula of the raw rubber is as follows:

[0080] ;

[0081] m is an integer from 20 to 100, and n is an integer from 1 to 10;

[0082] S12, providing fumed silica, trimethylolphosphine oxide and 2,4-dihydroxybenzophenone, mixing with raw rubber, reacting to obtain a second cross-linked polymer; and

[0083] S13, mixing the first cross-linked polymer and the second cross-linked polymer to obtain a rubber compound.

[0084] In S11:

[0085] In some embodiments, the method for preparing raw rubber comprises:

[0086] S111, providing a mixed solution, wherein the mixed solution includes hydroxy-terminated polydimethylsiloxane (PDMS), polycaprolactone diol (HO-PCL-OH) and a solvent;

[0087] S112, adding 1,6-hexamethylene diisocyanate (HDI) and 3-isocyanate propyltrimethoxysilane to the mixed solution for reaction to obtain raw rubber;

[0088] In S111:

[0089] In some embodiments, in the mixed solution, the molar concentration of the terminal hydroxyl polydimethylsiloxane is 0.05 mmol / g to 0.1 mmol / g, for example, 0.06 mmol / g, 0.07 mmol / g, 0.08 mmol / g, 0.09 mmol / g, etc. Within this molar concentration range, the terminal hydroxyl polydimethylsiloxane is conducive to uniform dissolution and dispersion.

[0090] In some embodiments, the molar concentration of polycaprolactone diol in the mixed solution is 0.01 mmol / g to 0.05 mmol / g, for example, 0.02 mmol / g, 0.03 mmol / g, 0.04 mmol / g, etc. Within this molar concentration range, it is beneficial for the polycaprolactone diol to be uniformly dissolved and dispersed.

[0091] In some embodiments, in the mixed solution, the molar ratio of the hydroxyl-terminated polydimethylsiloxane to the polycaprolactone diol is (5-10): (1-5), for example, 6:2, 7:3, 8:5, 9:4, etc. Within the molar ratio range, the subsequent reaction of the hydroxyl-terminated polydimethylsiloxane and the polycaprolactone diol is favorable.

[0092] In some embodiments, the solvent is selected from one or more of anhydrous tetrahydrofuran, chlorobenzene, diethylene glycol monobutyl ether, triethylene glycol monobutyl ether, diethylene glycol dimethyl ether, dimethyl sulfoxide, acetone, acetophenone, N,N-dimethylformamide, ethyl acetate, pyrrole, and butyric acid.

[0093] The mixed liquid can be obtained by mixing terminal hydroxyl polydimethylsiloxane, polycaprolactone diol and a solvent.

[0094] In S112:

[0095] In some embodiments, adding hexamethylene diisocyanate and 3-isocyanate propyltrimethoxysilane to the mixed solution comprises: adding hexamethylene diisocyanate to the mixed solution, reacting; and then adding 3-isocyanate propyltrimethoxysilane, reacting.

[0096] Furthermore, the molar ratio of the hydroxy-terminated polydimethylsiloxane to hexamethylene diisocyanate is (5-10): (8-12), for example, 6:10, 7:9, 8:11, 9:10, etc. Within the molar ratio range, it is beneficial to promote the full reaction of hexamethylene diisocyanate.

[0097] In some embodiments, adding hexamethylene diisocyanate to the mixed solution further comprises: adding a second catalyst. It is understood that the second catalyst can improve the reaction efficiency.

[0098] Further, the second catalyst includes dibutyltin dilaurate.

[0099] In some embodiments, the reaction temperature after adding hexamethylene diisocyanate is 50°C to 80°C, such as 55°C, 60°C, 65°C, 70°C, 75°C, etc.; the reaction time is 2h to 5h, such as 2.5h, 3h, 3.5h, 4h, 4.5h, etc.; the reaction atmosphere is an inert atmosphere. The inert atmosphere can be created by conventional inert gases, such as nitrogen, helium, etc.

[0100] Furthermore, the molar ratio of the hydroxy-terminated polydimethylsiloxane to 3-isocyanate propyltrimethoxysilane is (5-10): (1-3), for example, 6:1.5, 7:2, 8:2, 9:2.5, etc. Within the molar ratio range, it is beneficial to promote the full reaction of 3-isocyanate propyltrimethoxysilane.

[0101] In some embodiments, the reaction temperature after adding 3-isocyanatepropyltrimethoxysilane is 50°C to 80°C, for example, 55°C, 60°C, 65°C, 70°C, 75°C, etc.; the reaction time is 1h to 3h, for example, 1.5h, 2h, 2.5h, etc.; the reaction atmosphere is an inert atmosphere. The inert atmosphere can be created by conventional inert gases, such as nitrogen, helium, etc.

[0102] The values ​​of m and n are as mentioned above and will not be repeated here.

[0103] In S12:

[0104] In some embodiments, the mixing reaction of fumed silica, trishydroxymethylphosphine oxide, 2,4-dihydroxybenzophenone and raw rubber includes: mixing. The mixing can be carried out using conventional equipment in the art, such as an open mill, and each monomer is added into the open mill for reaction to obtain a mixed rubber.

[0105] Furthermore, the mixing temperature is 100° C. to 150° C., for example, 110° C., 120° C., 130° C., 140° C., etc. Under the mixing temperature condition, it is favorable for the hydroxyl groups of each monomer to crosslink and solidify the raw rubber through condensation reaction to obtain a mixed rubber.

[0106] In some embodiments, the mass ratio of raw rubber, fumed silica, tris(hydroxymethyl)phosphine oxide and 2.4-dihydroxybenzophenone is (68-72):(8-15):(8-15):(3-5), for example, it can be 69:10:10:4, 70:12:12:4, 71:9:14:4, 70:11:13:4, etc. Within the mass ratio range, raw rubber, fumed silica, tris(hydroxymethyl)phosphine oxide and 2.4-dihydroxybenzophenone can work synergistically to improve the mechanical properties, waterproof properties, anti-ultraviolet aging properties and flame retardant properties of the mixed rubber.

[0107] It can be understood that the raw rubber can be hydrolyzed in the air to convert the trimethoxysilane at its terminal into silanol groups to form modified raw rubber, which can then undergo condensation cross-linking reactions with other monomers.

[0108] In some embodiments, the mixing further comprises adding a first catalyst.

[0109] The first catalyst is described above and will not be described in detail here.

[0110] In a third aspect, the embodiments of the present application also provide an application of the above-mentioned rubber compound or the rubber compound prepared by the above-mentioned preparation method.

[0111] Since the rubber mix has excellent mechanical properties, waterproof properties, anti-ultraviolet aging properties and flame retardant properties, the rubber mix provided by the present invention is particularly suitable for waterproof lamp seals.

[0112] The present application is described in detail below through specific embodiments. The following embodiments are only partial embodiments of the present application and are not limitations of the present application.

[0113] Embodiment 1: This embodiment provides a rubber compound, and its preparation method is as follows:

[0114] 18 g of hydroxy-terminated polydimethylsiloxane (PDMS, 9 mmol, number average molecular weight = 2000), 2 g of polycaprolactone diol (HO-PCL-OH, 1 mmol, number average molecular weight = 2000) and 100 g of anhydrous tetrahydrofuran (THF) were weighed and added into a three-necked flask, the temperature was raised to 60°C, and stirring was started until the reactants were completely dissolved; 1.51 g of 1,6-hexamethylene diisocyanate (HDI, 9 mmol) and 0.2 g of dibutyltin dilaurate were added, and after reacting for 3 h under a nitrogen atmosphere, 0.41 g of 3-isocyanatepropyltrimethoxysilane (2 mmol) was added, and the reaction was continued for 2 h under a nitrogen atmosphere. The reaction solution was poured into a polytetrafluoroethylene dish, placed in an oven, and dried at 60°C for 2 h to remove THF in the system to obtain a trimethoxysilane-terminated raw rubber, the structural formula of which is shown below:

[0115] ;

[0116] Repeat the above steps to prepare enough raw rubber for subsequent experiments;

[0117] Weigh 35.5g of raw rubber and cut it into small pieces; take 6g of fumed silica, 6g of trimethylol phosphorus oxide, 2g of 2.4-dihydroxybenzophenone and 0.5g of sodium hydroxide, and mix them on an open mill; set the roller temperature to 120°C, add the raw rubber first, wrap it around the roller after softening, and keep a proper amount of accumulated rubber at the upper end of the roller gap; then add the compounding agents to the open mill in turn for mixing, the trimethoxysilane at the end of the raw rubber molecular chain hydrolyzes in the air to form silanol groups, and condenses with the hydroxyl groups of other monomers in the system to make the raw rubber complete cross-linking and curing, and obtain a second cross-linked polymer; then add 15g of fluorosilicone rubber (grade FS6265, purchased from Beijing Institute of Aeronautical Materials, AECC), continue mixing for 0.5h, and obtain a mixed rubber.

[0118] Example 2: This example is basically the same as Example 1, except that the reaction raw materials of the raw rubber in this example include: 16g of terminal hydroxyl polydimethylsiloxane (PDMS, 8mmol, number average molecular weight = 2000), 4g of polycaprolactone diol (HO-PCL-OH, 2mmol, number average molecular weight = 2000), 1.51g of 1,6-hexamethylene diisocyanate (HDI, 9mmol) and 0.41g of 3-isocyanatepropyltrimethoxysilane (2mmol).

[0119] Example 3: This example is basically the same as Example 1, except that the reaction raw materials of the raw rubber in this example include: 14g of terminal hydroxyl polydimethylsiloxane (PDMS, 7mmol, number average molecular weight = 2000), 6g of polycaprolactone diol (HO-PCL-OH, 3mmol, number average molecular weight = 2000), 1.51g of 1,6-hexamethylene diisocyanate (HDI, 9mmol) and 0.41g of 3-isocyanatepropyltrimethoxysilane (2mmol).

[0120] Example 4: This example is basically the same as Example 1, except that the reaction raw materials of the raw rubber in this example include: 12g of terminal hydroxyl polydimethylsiloxane (PDMS, 6mmol, number average molecular weight = 2000), 8g of polycaprolactone diol (HO-PCL-OH, 4mmol, number average molecular weight = 2000), 1.51g of 1,6-hexamethylene diisocyanate (HDI, 9mmol) and 0.41g of 3-isocyanatepropyltrimethoxysilane (2mmol).

[0121] Comparative Example: This comparative example is basically the same as Example 1, except that the raw materials for the reaction of the raw rubber in this comparative example include: 20 g of hydroxy-terminated polydimethylsiloxane (PDMS, 10 mmol, number average molecular weight = 2000), 1.51 g of 1,6-hexamethylene diisocyanate (HDI, 9 mmol) and 0.41 g of 3-isocyanate propyltrimethoxysilane (2 mmol);

[0122] The rubber mix includes 41.5 g of raw rubber, 6 g of fumed silica, 2 g of triethanolamine and 0.5 g of sodium hydroxide.

[0123] The rubber mixtures of Examples 1 to 4 and the rubber mixture of the comparative example were cut into different shapes and used for testing mechanical properties, waterproof properties and flame retardant properties. The results are shown in Table 1.

[0124] Among them, the tensile strength test: the fracture 20mm / min test is carried out in accordance with the standard GB / T 1040;

[0125] The UV aging test was carried out according to GB / T 16422.3-1996 standard. The UV aging time was 28 days. After UV aging, the samples were subjected to tensile strength test. The tensile strength retention rate after UV aging test was used to reflect the anti-UV aging performance of the compound rubber.

[0126] The combustion performance test is carried out in accordance with standard GB / T 10707;

[0127] Table 1:

[0128] .

[0129] As shown in Table 1, in Examples 1 to 4, the tensile strength, bending modulus, and tensile strength retention rate after UV aging of the rubber mixes provided by the present application are much higher than those of the rubber mixes in the comparative example, among which the tensile strength of Example 4 is the largest, and the tensile strength retention rate after UV aging of Example 1 is the highest; in addition, the flame retardant properties of the rubber mixes of Examples 1 to 4 are also better than those of the comparative example. In summary, the rubber mixes provided by the present application have excellent mechanical properties, waterproof properties, UV aging resistance, and flame retardant properties.

[0130] The technical solutions provided by the embodiments of the present application are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A rubber compound, characterized in that: include: a first cross-linked polymer, wherein the first cross-linked polymer is fluorosilicone rubber; as well as A second cross-linked polymer, wherein the components of the second cross-linked polymer include modified raw rubber, fumed silica, trishydroxymethylphosphine oxide and 2,4-dihydroxybenzophenone; Wherein, the structural formula of the modified raw rubber is shown as follows: ； m is an integer of 20-100, and n is an integer of 1-10.

2. The rubber compound according to claim 1, characterized in that The mass fraction of the first cross-linked polymer accounts for 20% to 30% of the total mass fraction of the first cross-linked polymer and the second cross-linked polymer; and / or In the modified raw rubber, m is an integer of 40 to 80; and / or In the modified raw rubber, n is an integer of 3 to 8; and / or In the second cross-linked polymer, the mass ratio of the modified raw rubber, the fumed silica, the trihydroxymethylphosphine oxide and the 2,4-dihydroxybenzophenone is (68-72): (8-15): (8-15): (3-5); and / or The second cross-linked polymer is composed of the modified raw rubber, the fumed silica, the trishydroxymethylphosphine oxide and the 2,4-dihydroxybenzophenone cross-linked.

3. The rubber compound according to claim 1, characterized in that The rubber mix also includes a first catalyst; The first catalyst includes sodium hydroxide; In the rubber mix, the mass ratio of the modified raw rubber to the first catalyst is (68-72): (0.5-2); The rubber compound consists of the first cross-linked polymer, the second cross-linked polymer and the first catalyst.

4. A method for preparing a rubber compound, characterized in that: The steps include: A first cross-linked polymer and a modified raw rubber are provided, wherein the first cross-linked polymer is fluorosilicone rubber, and the structural formula of the modified raw rubber is as shown below: ； m is an integer from 20 to 100, and n is an integer from 1 to 10; Providing fumed silica, trimethylolphosphine oxide and 2,4-dihydroxybenzophenone, mixing with the modified raw rubber, reacting to obtain a second cross-linked polymer; as well as The first cross-linked polymer and the second cross-linked polymer are mixed to obtain a rubber compound.

5. The preparation method according to claim 4, characterized in that: The preparation method of the modified raw rubber comprises: Providing a mixed solution, wherein the mixed solution includes hydroxy-terminated polydimethylsiloxane, polycaprolactone diol and a solvent; Add 1,6-hexamethylene diisocyanate and 3-isocyanate propyltrimethoxysilane into the mixed solution for reaction to obtain modified raw rubber.

6. The preparation method according to claim 5, characterized in that: In the mixed solution, the molar concentration of the hydroxy-terminated polydimethylsiloxane is 0.05 mmol / g to 0.1 mmol / g; and / or In the mixed solution, the molar concentration of the polycaprolactone diol is 0.01 mmol / g to 0.05 mmol / g; and / or In the mixed solution, the molar ratio of the terminal hydroxyl polydimethylsiloxane to the polycaprolactone diol is (5-10): (1-5); and / or The solvent is selected from one or more of anhydrous tetrahydrofuran, chlorobenzene, diethylene glycol monobutyl ether, triethylene glycol monobutyl ether, diethylene glycol dimethyl ether, dimethyl sulfoxide, acetone, acetophenone, N,N-dimethylformamide, ethyl acetate and pyrrole.

7. The preparation method according to claim 5, characterized in that: The adding of 1,6-hexamethylene diisocyanate and 3-isocyanate propyltrimethoxysilane to the mixed solution comprises: Adding 1,6-hexamethylene diisocyanate to the mixed solution for reaction; Then, 3-isocyanatepropyltrimethoxysilane was added and reacted.

8. The preparation method according to claim 7, characterized in that: The molar ratio of the terminal hydroxyl polydimethylsiloxane to the 1,6-hexamethylene diisocyanate is (5-10): (8-12); and / or The molar ratio of the hydroxy-terminated polydimethylsiloxane to the 3-isocyanate propyltrimethoxysilane is (5-10): (1-3); and / or The reaction temperature after adding hexamethylene diisocyanate is 50°C to 80°C, the reaction time is 2h to 5h, and the reaction atmosphere is an inert atmosphere; and / or The reaction temperature after adding 3-isocyanatepropyltrimethoxysilane is 50° C. to 80° C., the reaction time is 1 h to 3 h, and the reaction atmosphere is an inert atmosphere.

9. The preparation method according to claim 5, characterized in that: The mass ratio of the modified raw rubber, the fumed silica, the trishydroxymethylphosphine oxide and the 2,4-dihydroxybenzophenone is (68-72): (8-15): (8-15): (3-5); and / or The mass fraction of the first cross-linked polymer accounts for 20% to 30% of the total mass fraction of the first cross-linked polymer and the second cross-linked polymer; and / or The mixing reaction of the fumed silica, the trimethylol phosphorus oxide, the 2,4-dihydroxybenzophenone and the modified raw rubber comprises: kneading; the kneading temperature is 100° C. to 150° C.

10. The application of the mixed rubber in the sealing of lamps is characterized by: The rubber mix is ​​the rubber mix according to any one of claims 1 to 3, or the rubber mix is ​​prepared by the preparation method according to any one of claims 4 to 9.

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