CN112341823A - Rice hull ash precipitated silica reinforced high-temperature-resistant silicon rubber compound and preparation method and application thereof - Google Patents
Rice hull ash precipitated silica reinforced high-temperature-resistant silicon rubber compound and preparation method and application thereof Download PDFInfo
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Abstract
本发明采用稻壳灰沉淀二氧化硅来补强甲基乙烯基硅橡胶生胶，并与其它组分相互配合，制备得到硅橡胶混炼胶，其具有常规硅橡胶的良好的强度特性，并且具备超出常规普通硅橡胶更好的耐温特性。稻壳沉淀二氧化硅在制备硅橡胶混炼胶中的应用，极大地提高了稻壳沉淀二氧化硅在民用领域的应用拓展，有利于资源再利用。The present invention adopts rice husk ash precipitated silica to reinforce methyl vinyl silicone rubber raw rubber, and cooperates with other components to prepare a silicone rubber compounded rubber, which has the good strength characteristics of conventional silicone rubber, and It has better temperature resistance than conventional ordinary silicone rubber. The application of rice husk precipitated silica in the preparation of silicone rubber compound greatly improves the application and expansion of rice husk precipitated silica in the civilian field, which is beneficial to the reuse of resources.
Description
Technical Field
The invention belongs to the field of silicone rubber compound, and particularly relates to a rice hull ash precipitated silica reinforced high-temperature resistant silicone rubber compound and a preparation method and application thereof.
Background
At present, the silicon rubber compound at home and abroad is reinforced by using gas-phase silicon dioxide (gas-phase white carbon black) or precipitated silicon dioxide (precipitated white carbon black) prepared by a water glass method. Although the obtained silicone rubber compound has high strength and good transparency, the preparation cost is high and the temperature resistance is not high, and the temperature resistance of the silicone rubber compound is generally required to be improved by using materials such as transition metals.
Disclosure of Invention
The invention provides a silicon rubber compound, which comprises the following raw materials: the methyl vinyl silicone rubber comprises raw methyl vinyl silicone rubber, silicon dioxide and a structural control agent, wherein the silicon dioxide at least comprises rice hull ash precipitated silicon dioxide.
According to an embodiment of the invention, the preparation feedstock comprises: the raw rubber of the methyl vinyl silicone rubber comprises 10-60 wt% of silicon dioxide and 5-12 wt% of a structural control agent, wherein the silicon dioxide at least contains rice hull ash precipitated silicon dioxide.
According to an embodiment of the invention, the silica comprises 20-55%, such as 30-45%, illustratively 35%, 40%, 42%, 45%, etc., of the weight percent of the raw rubber.
According to an embodiment of the invention, the structuring control agent comprises 6-11%, such as 6-9%, illustratively 7%, 7.8%, 8%, etc. of the weight percentage of the silica.
According to an embodiment of the present invention, the raw methyl vinyl silicone rubber is selected from at least one of raw methyl vinyl silicone rubber having a molar vinyl content in the range of 0.01 to 8%, for example, at least one of raw methyl vinyl silicone rubber having a molar vinyl content of 0.03%, 0.05%, 0.08%, 0.14%, 0.18%, 0.22%, 1.0%, 3.0%, 5.0%; exemplary are selected from the group consisting of a methyl vinyl silicone rubber crude having a vinyl molar content of 0.05% and a methyl vinyl silicone rubber crude having a vinyl molar content of 0.22%, for example: the mass ratio of the methyl vinyl silicone rubber crude rubber with the vinyl molar content of 0.03-0.08% to the methyl vinyl silicone rubber crude rubber with the vinyl molar content of 0.15-0.30% is (1-3) to (2-4).
According to an embodiment of the present invention, the silica may be only rice husk ash precipitated silica, or may be a mixture of non-rice husk ash precipitated silica and rice husk ash precipitated silica. Further, the rice hull ash precipitated silica represents more than 0 to 100% by weight of the silica, for example 30%, 33.3%, 50%, 66%, 100%, preferably 5-70%.
The "rice hull ash precipitated silica" refers to silica prepared by using rice hulls or rice hull ash as a raw material and adopting a precipitation method. According to the invention, it is preferred that the rice husk ash precipitated silica has a particle size of 1 to 50nm, for example 2 to 15 nm; preferably, the BET specific surface area is 10 to 200m2In g, e.g. 20 to 70m2(ii)/g; the preferred pore volume is 0.05-1cm2In g, e.g. 0.1-0.5cm2/g。
The "non-rice hull ash precipitated silica" means silica other than rice hull ash precipitated silica, for example, fumed silica, calcined silica, direct precipitation silica, sol-gel silica, ultrasonic silica, and the like.
The "fumed silica" refers to silica produced by reacting a silicon halide, oxygen (or air), and hydrogen at an elevated temperature.
The "silica calcined" is silica prepared by mixing a mineral containing a silicon source with a reagent and calcining the mixture.
The direct precipitation method silicon dioxide refers to silicon dioxide prepared by taking silicate and sulfuric acid (or hydrochloric acid or pure carbon dioxide) as raw materials and adopting a precipitation method.
The sol-gel method silicon dioxide is silicon dioxide obtained by taking metal salt of silicon as a silicon source, forming silicon gel after hydrolysis, removing an organic solvent and drying.
The ultrasonic method silicon dioxide is prepared by mixing minerals containing silicon sources and reagents and utilizing chemical effects and mechanical effects generated during ultrasonic cavitation.
The rice hull ash precipitated silica and the non-rice hull ash precipitated silica may be prepared by methods known in the art or may be purchased commercially. For example, rice hull ash precipitated silica may be purchased from Green Sugar AG.
According to an embodiment of the present invention, the rice husk ash precipitated silica may be selected from iron oxide-coated rice husk ash precipitated silicas.
The structuring agent may be selected from silicone rubber structuring agents known in the art, such as, for example, hydroxy silicone oil, hexamethyldisilazane, methoxy silicone oil, dimethyldiethoxysilane, dimethyldimethoxysilane, and the like. In one embodiment of the invention, the structuring control agent is a hydroxy silicone oil. According to an embodiment of the invention, the hydroxyl silicone oil is a medium or low viscous hydroxyl silicone oil. For example, the viscosity of the medium-viscosity hydroxyl silicone oil is 46-100mm/s2The viscosity of the low-viscosity hydroxyl silicone oil is 25-45mm/s2. Further, the hydroxyl silicone oil has a hydroxyl content of 4 to 9.5 wt%, illustratively 5 wt%, 6 wt%, 7 wt%, 8 wt%, 9 wt%.
According to an embodiment of the present invention, the preparation raw material may further include a release agent such as zinc stearate or the like.
According to an embodiment of the present invention, the preparation raw material may further include a heat-resistant agent such as iron sesquioxide and the like.
According to an embodiment of the present invention, the preparation raw material may further include other additives such as a flame retardant, etc. Such as aluminum hydroxide and the like.
According to an exemplary embodiment of the present invention, the silicone rubber compound preparation raw materials include, in parts by weight: 100 parts of methyl vinyl silicone rubber crude rubber, 42 parts of rice hull ash precipitated silica and 3.3 parts of low-viscosity hydroxyl silicone oil;
the raw methyl vinyl silicone rubber comprises raw methyl vinyl silicone rubber with the vinyl mole fraction of 0.05 percent and raw methyl vinyl silicone rubber with the vinyl mole fraction of 0.22 percent in a mass ratio of 2: 3;
the hydroxyl content of the low-viscosity hydroxyl silicone oil is 9 wt%.
According to an exemplary embodiment of the present invention, the silicone rubber compound preparation raw materials include, in parts by weight: 100 parts of methyl vinyl silicone rubber crude rubber, 28 parts of rice hull ash precipitated silica, 14 parts of non-rice hull ash precipitated silica and 3.3 parts of low-viscosity hydroxyl silicone oil;
the raw methyl vinyl silicone rubber comprises raw methyl vinyl silicone rubber with the vinyl mole fraction of 0.05 percent and raw methyl vinyl silicone rubber with the vinyl mole fraction of 0.22 percent in a mass ratio of 2: 3;
the hydroxyl content of the low-viscosity hydroxyl silicone oil is 9 wt%.
According to an exemplary embodiment of the present invention, the silicone rubber compound preparation raw materials include, in parts by weight: 100 parts of methyl vinyl silicone rubber crude rubber, 21 parts of rice hull ash precipitated silica, 21 parts of non-rice hull ash precipitated silica and 3.3 parts of low-viscosity hydroxyl silicone oil;
the raw methyl vinyl silicone rubber comprises raw methyl vinyl silicone rubber with the vinyl mole fraction of 0.05 percent and raw methyl vinyl silicone rubber with the vinyl mole fraction of 0.22 percent in a mass ratio of 2: 3;
the hydroxyl content of the low-viscosity hydroxyl silicone oil is 9 wt%.
According to an exemplary embodiment of the present invention, the silicone rubber compound preparation raw materials include, in parts by weight: 100 parts of methyl vinyl silicone rubber crude rubber, 14 parts of rice hull ash precipitated silica, 28 parts of non-rice hull ash precipitated silica and 3.3 parts of low-viscosity hydroxyl silicone oil;
the raw methyl vinyl silicone rubber comprises raw methyl vinyl silicone rubber with the vinyl mole fraction of 0.05 percent and raw methyl vinyl silicone rubber with the vinyl mole fraction of 0.22 percent in a mass ratio of 2: 3;
the hydroxyl content of the low-viscosity hydroxyl silicone oil is 9 wt%.
The invention also provides a preparation method of the silicon rubber compound, which comprises the following steps: the silicone rubber compound is prepared from the raw materials.
According to an embodiment of the invention, the preparation method comprises the steps of:
(1) mixing raw methyl vinyl silicone rubber and a structural control agent;
(2) adding silicon dioxide into the mixture obtained in the step (1);
(3) heating the mixture obtained in the step (2).
According to the invention, in the step (1), the raw methyl vinyl silicone rubber and the structural control agent are mixed under the protection of inert gas, such as nitrogen.
According to the invention, in step (2), the silica is added in portions.
According to the invention, in the step (3), after the materials in the step (2) are mixed uniformly, the temperature is raised for the first time, the vacuum pumping is carried out after the temperature rise is finished, the temperature is raised for the second time and kept, the vacuum is unloaded, and the temperature is cooled under the protection of inert gas.
Preferably, each raw material has an amount as described above.
According to an embodiment of the invention, in step (2), the silica may be added in at least 3 portions, for example in 4, 5 or 6 portions. For example, the addition amount of silica generally shows a decreasing trend according to the increase of times; illustratively, when the addition is made in 5 portions, the addition is made in the proportions of 30%, 25%, 15%, 5% of the total amount of silica, respectively, in this order.
According to the embodiment of the invention, in the step (2), after each batch of silicon dioxide is added, the silicon dioxide is uniformly mixed with other materials, and then the next batch of silicon dioxide is added.
According to the embodiment of the invention, in the step (3), the inert gas is introduced for protection in the whole process of the first temperature rise.
According to the embodiment of the invention, in the step (3), the temperature reached by the first temperature rise is 110-.
According to an embodiment of the invention, in step (3), after the evacuation, the degree of vacuum is in the range of-0.1 to-0.05 MPa, illustratively-0.09 MPa.
According to the embodiment of the present invention, in the step (3), the temperature reached by the second temperature rise is 145-165 ℃, such as 150-160 ℃, and exemplary 150 ℃, 155 ℃ and 160 ℃.
According to an embodiment of the invention, in step (3), the incubation time is 1-3h, such as 1.5-2.5h, exemplary 1.5h, 2h, 2.5 h.
According to an embodiment of the invention, in step (3), the temperature to which cooling is carried out is below 100 ℃, for example below 80 ℃.
According to the embodiment of the invention, the step (3) further comprises the steps of discharging and filtering after cooling.
The invention also provides the silicone rubber compound prepared by the method.
The invention also provides application of the rice hull ash precipitated silica in preparation of silicone rubber compound.
Preferably, the rice hull ash precipitated silica is iron oxide coated rice hull precipitated silica.
Wherein the silicone rubber compound has the meaning as described above.
The invention also provides application of the silicone rubber compound in preparation of silicone rubber such as universal silicone rubber, sealing elements, wires and cables, nipples, insulating silicone rubber, high-temperature-resistant silicone rubber, flame-retardant silicone rubber, rubber rollers, swimming caps, steam-resistant silicone rubber, conductive silicone rubber, automotive silicone rubber and the like, and preferably in preparation of high-temperature-resistant sealing elements.
The invention has the beneficial effects that:
according to the invention, the rice hull ash precipitated silica is used for reinforcing methyl vinyl silicone rubber crude rubber and is matched with other components to prepare the silicone rubber gross rubber, and the silicone rubber gross rubber has the good strength characteristic of the conventional silicone rubber and has better temperature resistance characteristic than the conventional common silicone rubber.
And the application of the rice hull precipitated silica in the preparation of the silicone rubber compound greatly improves the application and expansion of the rice hull precipitated silica in the civil field, and makes a contribution to resource recycling and social waste reduction. Particularly, when the iron oxide coated rice hull precipitated silica is used for reinforcing methyl vinyl silicone rubber crude rubber, other heat-resistant agents are not required to be added, and the heat resistance of the prepared rubber compound product is better than that of the conventional precipitated silica.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to specific embodiments. It is to be understood that the following examples are only illustrative and explanatory of the present invention and should not be construed as limiting the scope of the present invention. All the technologies realized based on the above-mentioned contents of the present invention are covered in the protection scope of the present invention.
Unless otherwise indicated, the raw materials and reagents used in the following examples are all commercially available products or can be prepared by known methods.
Example 1
40 parts of raw methyl vinyl silicone rubber with 0.05 percent of vinyl mole fraction and 60 parts of raw methyl vinyl silicone rubber with 0.22 percent of vinyl mole fraction and 3.3 parts of low-viscosity hydroxyl silicone oil (30 mm/s) with 9 percent of hydroxyl content2) The mixture was charged into a kneader, and the kneader was passivated with nitrogen. 42 parts of rice husk ash precipitated silica (Green Sugar AG, particle diameter: 5-6 nm, BET specific surface area: 49.4 m)2Per g, purity: not less than 98.5%, pore volume: 0.174cm2/g) adding the mixture into a kneader for 5 times respectively, adding the mixture into the kneader in a ratio of 30%, 25%, 15% and 5% of the total amount of the rice hull ash precipitated silica sequentially and respectively, adding the next batch of rice hull ash precipitated silica after the mixture is uniformly mixed after each addition, gradually heating up after all the rice hull ash precipitated silica is uniformly mixed with the materials in the kneader, introducing nitrogen for protection in the whole process, heating up to 120 ℃, turning off the nitrogen, starting vacuumizing until the vacuum degree is-0.09 MPa, gradually heating up to 155 ℃, maintaining for 1.5 hours, then discharging the vacuum, and introducing the nitrogen; and cooling the obtained product to below 100 ℃, discharging and filtering to obtain the silicon rubber compound.
Example 2
40 portions of methyl vinyl silicone rubber crude rubber with 0.05 percent of vinyl mole fraction and 60 portions of methyl vinyl silicone rubber with 0.22 percent of vinyl mole fraction and 3.3 portions of low-viscosity hydroxyl silicon with 9 weight percent of hydroxyl contentOil (30 mm/s)2) The mixture was charged into a kneader, and the kneader was passivated with nitrogen. 28 parts by mass of rice hull ash precipitated silica (Green Sugar AG, particle diameter: 5-6 nm, BET specific surface area: 49.4 m)2Per g, purity: not less than 98.5%, pore volume: 0.174cm2/g) and 14 parts of common precipitation method silicon dioxide YX900A, adding the mixed silicon dioxide into a kneader respectively for 5 times, adding the mixed silicon dioxide into the kneader respectively according to the proportion of 30%, 25%, 15% and 5% of the total amount of the silicon dioxide, adding the next batch of silicon dioxide after the batch is uniformly mixed after each addition, gradually heating up after all the silicon dioxide is uniformly mixed, introducing nitrogen for protection in the whole process, heating up to 120 ℃, turning off the nitrogen, starting vacuumizing, heating up to 155 ℃ gradually, maintaining for 1.5 hours, then discharging the vacuum, and introducing the nitrogen; and cooling the obtained product to below 100 ℃, discharging and filtering to obtain the silicon rubber compound.
Example 3
40 parts of raw methyl vinyl silicone rubber with 0.05 percent of vinyl mole fraction and 60 parts of raw methyl vinyl silicone rubber with 0.22 percent of vinyl mole fraction and 3.3 parts of low-viscosity hydroxyl silicone oil (30 mm/s) with 9 percent of hydroxyl content2) Putting the mixture into a kneading machine, and passivating the kneading machine by nitrogen; 21 parts by mass of rice hull ash precipitated silica (Green Sugar AG, particle diameter: 5-6 nm, BET specific surface area: 49.4 m)2Per g, purity: not less than 98.5%, pore volume: 0.174cm2/g) and 21 parts of ordinary precipitation method silicon dioxide YX900A, adding the mixed silicon dioxide into a kneader respectively for 5 times, adding the mixed silicon dioxide into the kneader respectively according to the proportion of 30%, 25%, 15% and 5% of the total amount of the silicon dioxide, adding the next batch of silicon dioxide after the batch is uniformly mixed after each addition, gradually heating up after all the silicon dioxide are uniformly mixed, introducing nitrogen for protection in the whole process, heating up to 120 ℃, turning off the nitrogen, starting vacuumizing, heating up to 155 ℃ gradually, maintaining for 1.5 hours, then discharging the vacuum, and introducing the nitrogen; and cooling the obtained product to below 100 ℃, discharging and filtering to obtain the silicon rubber compound.
Example 4
40 parts of raw methyl vinyl silicone rubber with 0.05 percent of vinyl mole fraction and 60 parts of raw methyl vinyl silicone rubber with 0.22 percent of vinyl mole fraction and 3.3 parts of low-viscosity hydroxyl silicone oil (30 mm/s) with 9 percent of hydroxyl content2) Putting the mixture into a kneading machine, and passivating the kneading machine by nitrogen; 14 parts by mass of rice hull ash precipitated silica (Green Sugar AG, particle diameter: 5-6 nm, BET specific surface area: 49.4 m)2Per g, purity: not less than 98.5%, pore volume: 0.174cm2/g) and 28 parts of ordinary precipitation method silicon dioxide YX900A, adding the mixed silicon dioxide into a kneader respectively for 5 times, adding the mixed silicon dioxide into the kneader respectively according to the proportion of respectively adding 30%, 25%, 15% and 5% of the total amount of the silicon dioxide in turn, adding the next batch of silicon dioxide after the batch of silicon dioxide is uniformly mixed after each addition, gradually heating up after all the silicon dioxide is uniformly mixed, introducing nitrogen for protection in the whole process, heating up to 120 ℃, turning off the nitrogen, starting vacuumizing, raising the vacuum degree to-0.09 MPa, gradually heating up to 155 ℃, maintaining for 1.5 hours, then discharging the vacuum, and introducing the nitrogen; and cooling the obtained product to below 100 ℃, discharging and filtering to obtain the silicon rubber compound.
Properties of the Silicone rubber mixes prepared in examples 1-4
Note: hardness was measured according to ASTM D-2240, tensile strength according to ASTM D412, elongation at break according to ASTM D412, and aging according to ASTM D573.
From the above data, it can be seen that the performance retention of the silicone rubber compound reinforced with rice hull ash precipitated silica is better after aging.
The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The silicone rubber compound is characterized by comprising the following preparation raw materials: the methyl vinyl silicone rubber comprises raw rubber, silicon dioxide and a structural control agent, wherein the silicon dioxide accounts for 10-60% of the weight of the raw rubber, the structural control agent accounts for 5-12% of the weight of the silicon dioxide, the silicon dioxide at least contains rice hull ash precipitated silicon dioxide, and the rice hull ash precipitated silicon dioxide accounts for more than 0-100% of the weight of the silicon dioxide;
preferably, the silicon dioxide accounts for 30-45% of the weight of the raw rubber;
preferably, the structural control agent accounts for 6-9% of the weight of the silicon dioxide;
preferably, the rice hull ash precipitated silica comprises 5-70% by weight of said silica.
2. A silicone rubber compound according to claim 1, wherein the raw methyl vinyl silicone rubber is at least one selected from the group consisting of raw methyl vinyl silicone rubbers having a vinyl molar content in the range of 0.01 to 8%;
preferably, the raw methyl vinyl silicone rubber is a mixture of (1-3) and (2-4) raw methyl vinyl silicone rubber with the molar content of vinyl of 0.03-0.08% and raw methyl vinyl silicone rubber with the molar content of vinyl of 0.15-0.30%.
3. Silicone rubber compound according to claim 1 or 2, wherein the structuring control agent is a hydroxy silicone oil;
preferably, the hydroxyl silicone oil is medium-viscosity hydroxyl silicone oil or low-viscosity hydroxyl silicone oil;
preferably, the hydroxyl silicone oil has a hydroxyl group content of 4 to 9.5 wt%.
4. A silicone rubber compound according to any one of claims 1 to 3, wherein the silicone rubber compound preparation raw materials comprise, in parts by weight: 100 parts of methyl vinyl silicone rubber crude rubber, 42 parts of rice hull ash precipitated silica and 3.3 parts of low-viscosity hydroxyl silicone oil; the raw methyl vinyl silicone rubber comprises raw methyl vinyl silicone rubber with the vinyl mole fraction of 0.05 percent and raw methyl vinyl silicone rubber with the vinyl mole fraction of 0.22 percent in a mass ratio of 2: 3; the hydroxyl content of the low-viscosity hydroxyl silicone oil is 9 wt%; or,
the silicone rubber compound comprises the following raw materials in parts by weight: 100 parts of methyl vinyl silicone rubber crude rubber, 28 parts of rice hull ash precipitated silica, 14 parts of non-rice hull ash precipitated silica and 3.3 parts of low-viscosity hydroxyl silicone oil; the raw methyl vinyl silicone rubber comprises raw methyl vinyl silicone rubber with the vinyl mole fraction of 0.05 percent and raw methyl vinyl silicone rubber with the vinyl mole fraction of 0.22 percent in a mass ratio of 2: 3; the hydroxyl content of the low-viscosity hydroxyl silicone oil is 9 wt%; or,
the silicone rubber compound comprises the following raw materials in parts by weight: 100 parts of methyl vinyl silicone rubber crude rubber, 21 parts of rice hull ash precipitated silica, 21 parts of non-rice hull ash precipitated silica and 3.3 parts of low-viscosity hydroxyl silicone oil; the raw methyl vinyl silicone rubber comprises raw methyl vinyl silicone rubber with the vinyl mole fraction of 0.05 percent and raw methyl vinyl silicone rubber with the vinyl mole fraction of 0.22 percent in a mass ratio of 2: 3; the hydroxyl content of the low-viscosity hydroxyl silicone oil is 9 wt%; or,
the silicone rubber compound comprises the following raw materials in parts by weight: 100 parts of methyl vinyl silicone rubber crude rubber, 14 parts of rice hull ash precipitated silica, 28 parts of non-rice hull ash precipitated silica and 3.3 parts of low-viscosity hydroxyl silicone oil; the raw methyl vinyl silicone rubber comprises raw methyl vinyl silicone rubber with the vinyl mole fraction of 0.05 percent and raw methyl vinyl silicone rubber with the vinyl mole fraction of 0.22 percent in a mass ratio of 2: 3; the hydroxyl content of the low-viscosity hydroxyl silicone oil is 9 wt%.
5. A silicone rubber compound according to any one of claims 1 to 4, wherein the preparation raw material further comprises a release agent, a heat-resistant agent and/or a flame retardant.
6. A method for preparing a silicone rubber compound according to any one of claims 1 to 5, characterized by comprising the steps of:
(1) mixing raw methyl vinyl silicone rubber and a structural control agent;
(2) adding silicon dioxide into the mixture obtained in the step (1);
(3) heating the mixture obtained in the step (2);
preferably, in the step (1), under the protection of inert gas, mixing the raw methyl vinyl silicone rubber and the structural control agent;
preferably, in the step (2), the silicon dioxide is added in batches;
preferably, in the step (3), after the materials in the step (2) are uniformly mixed, performing first heating, vacuumizing after heating is completed, performing second heating and heat preservation, then unloading vacuum, and cooling under the protection of inert gas; preferably, in the step (3), inert gas is introduced for protection in the whole process of the first temperature rise; preferably, in the step (3), the temperature reached by the first temperature rise is 110-; preferably, in the step (3), after the vacuum pumping, the vacuum degree is-0.1 to-0.05 MPa; preferably, in the step (3), the temperature reached by the second temperature rise is 145-165 ℃.
7. A silicone rubber compound produced by the production method according to claim 6.
8. The application of rice hull ash precipitated silica in the preparation of silicone rubber compound; preferably, the rice hull ash precipitated silica is iron oxide coated rice hull precipitated silica.
9. Use of a silicone rubber compound as claimed in any of claims 1 to 5 or claim 7 for the preparation of silicone rubber; preferably the silicone rubber is a high temperature resistant seal.
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