CN114605839B - Ceramic silicon rubber with obvious XRD new crystallization peak after calcination and preparation method thereof - Google Patents
Ceramic silicon rubber with obvious XRD new crystallization peak after calcination and preparation method thereof Download PDFInfo
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- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
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- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08L2203/20—Applications use in electrical or conductive gadgets
- C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
Abstract
The invention relates to a ceramic silicon rubber with obvious XRD new crystallization peak after calcination and a preparation method thereof, wherein the ceramic silicon rubber comprises the following components in parts by weight: 100 parts of raw silicone rubber, 5-25 parts of white carbon black, 1-10 parts of vulcanizing agent, 20-400 parts of ceramifiable powder and Tao Chuji-100 parts of ceramifiable powder; the ceramifiable powder comprises the following components in parts by weight: 5-120 parts of glass powder, 5-200 parts of magnesium hydroxide, 5-200 parts of aluminum hydroxide, 1-20 parts of iron oxide and 1-20 parts of phenyl silicone oil; the molar ratio of the magnesium hydroxide, the aluminum hydroxide and the silicon rubber raw rubber to the Mg, the Al and the Si is as follows: 0.4-0.6:1:2-5. The hard ceramic layer produced after the ceramic silicon rubber is burned has stable structure, obvious XRD crystallization peak, good compactness, no obvious cracking and adhesive force, and can be wrapped on the outer layer of the burned object, and the protective layer prevents the flame from further burning and isolates the escape of cracking volatile matters and protects the burned object from being damaged by strong fire.
Description
Technical Field
The invention relates to ceramic silicon rubber and a preparation method thereof, and belongs to the technical field of preparation of silicon rubber composite materials.
Background
The ceramic silicon rubber material is a novel high polymer refractory material and is widely applied to the wire and cable industry. Compared with the traditional magnesia mineral fireproof cable and mica tape wrapped fireproof cable, the ceramifiable silicon rubber cable has the advantages of good safety, convenience in construction, cost saving and the like. The ceramifiable silicon rubber is prepared by adding a certain proportion of flame retardant auxiliary agent, ceramic filler, fluxing agent, cross-linking agent and other auxiliary agents into a silicon rubber matrix and performing vulcanization and cross-linking. The ceramifiable silicon rubber has the basic characteristics of common silicon rubber at normal temperature, such as high and low temperature resistance, weather resistance, ozone resistance, good processing performance and good electrical insulation performance. The ceramifiable silicone rubber material can be converted into a hard ceramic body by a "ceramifiation" process when subjected to a high temperature environment for an extended period of time or under a flame sustained firing. The hard ceramic shell can form a protective layer on the cable, so that flame dripping can be avoided, the integrity of the product can be maintained, and the circuit is ensured not to be short-circuited or broken in the burning process, so that the smoothness and the damage of electric power and communication are ensured, and the guarantee is provided for fire protection and self rescue, thereby having broad market prospect. In recent years, as the population number and density of cities are rapidly increased, the demand for ceramifiable silicone rubber is rapidly increasing in densely populated places such as high-rise buildings, large supermarkets, hospitals, large public entertainment places, rail transit facilities and the like.
The preparation of ceramic silicone rubber and the application of ceramic silicone rubber in wire and cable equipment are reported in scientific papers and patent literature published at home and abroad. For example: chinese patent document CN102850805A discloses a flame-retardant ceramic silicone rubber which is prepared by mixing silicone rubber, a platinum catalyst, a coupling agent, ceramic powder and a vulcanizing agent, wherein the ceramic silicone rubber can reduce the sintering temperature of ceramic, can be ablated into a ceramic shell, but has loose ceramic layer structure and no machineMechanical strength and cannot withstand external forces. Chinese patent document CN104310937a provides a ceramic silicone rubber, which reduces the cracking degree of the ceramic layer after ablation by adding calcium silicate, but the ceramic layer is loose. Chinese patent document CN201607977U discloses a fire-resistant ceramic silicone rubber cable, comprising an outer sheath from outside to inside, a protective layer, a filler and a concentric core cable, wherein the protective layer is composed of halogen-free low-smoke high-flame-retardance glass fiber ribbons, and the filler is composed of alkali-free glass fiber ropes. The patent has complex manufacturing process, can form a ceramic layer after ablation, does not have a compact and hard ceramic layer structure, and has poor mechanical property and shock resistance. Chinese patent document CN104629375a reports a ceramic-forming fireproof silicone rubber prepared from silicone compounds and ceramic powder materials, using a ceramic modifier of formula Fe (CO) 3 [(CH 2 ＝CHMe 2 SiO) 3 SiR]R is methyl or phenyl. The ceramic fireproof and refractory silicon rubber developed by the patent has good mechanical property and mechanical stability, avoids cracking or density reduction of a final ceramic shell layer, and effectively improves the reliability of the fireproof and refractory cable taking the silicon rubber as a fireproof and refractory layer material in practical application. The synthesis method of the ceramic modifier is complex, no industrial production technology exists at present, and the wide market demands are difficult to meet.
Chinese patent document CN113881233A provides a ceramic silicon rubber composite material, which realizes the bonding of a silicon rubber cracking product and an inorganic filler at the temperature lower than 1000 ℃ and the connection of mica edge melting and bonding phase at the high temperature through the reaction of boron oxide, boric acid, silicon dioxide and aluminum oxide, so that the ceramic silicon rubber composite material has good structural stability, mechanical property and dimensional stability, excellent residual strength after ablation and excellent electrical insulation performance at all temperatures. But the XRD crystallization peak is not obvious, and the ceramic shell has poorer multiple impact resistance at high temperature; the ceramic silicone rubber provided by the Chinese patent document CN113527892A is used for recombining and modifying ceramic powder, so that the ceramic powder is used as a filler and a ceramic agent in the silicone rubber. The silicon rubber has good low-temperature porcelain forming performance, can keep stable shape at 900-1000 ℃ and has good fluidity and plasticity, but the raw materials are relatively expensive and complex, the large-scale preparation is difficult to realize, and the volume resistivity is to be improved; the Chinese patent document CN113637325A discloses a ceramic silicon rubber material for a long-life electric wire, which comprises dimethyl silicon rubber, aluminum hydroxide, aluminum nitride, glass powder or diboron trioxide and wollastonite, and the prepared electric wire sheath has better ageing resistance and effectively prolonged service life, but the ceramic temperature is still higher, and the ceramic layer structure is kept stable for a shorter time than the similar one. In addition, the Chinese patent document CN113943547A relies on an organic silica gel with low methyl content and an inorganic conductive filler with high temperature stability, and the ceramic organic silica gel for the fire-resistant cable is invented, so that the strength and the conductivity of the ceramic silicone rubber cable are effectively enhanced, the insulation layer is prevented from being broken down by discharging of conductor bulges under high voltage, and the defects of faster mass weight loss rate increase after ablation and poor structural stability are overcome.
The physical and mechanical properties of the silicone rubber can be improved and the strength of the ceramic layer can be improved by using proper additives. The components of the residue generated by the cracking of the silicon rubber under high-temperature ablation are mainly SiO 2 Powder, using SiO 2 And the high temperature resistance of the inorganic filler, the SiO is caused by the bonding action of the fluxing agent at high temperature 2 And the flux plays a role of a connecting bridge, so that the solid particles are mutually adhered together, and a hard ceramic body is formed. Researches prove that the ceramic silicon rubber with good performance can be prepared only by selecting proper additive types and additive amounts, but the researches have the problems of complex formula, difficult control of the formula proportion and the like.
The ceramic silicone rubber Tao Jili is studied in detail at home and abroad. Ceramic silicone rubber was developed by Hanu et al in 2004, and it was thought that the decomposition of silicone rubber at high temperatures produced SiO 2 And the ceramic body is formed by eutectic reaction with a fused system Tao Tianliao/fluxing agent. But sintered sampleThe XRD test results of (C) indicate that amorphous SiO is formed 2 SEM photograph shows the generated SiO 2 Is looser. The study shows that only amorphous SiO is produced 2 In the case of the ceramic body, the performance of the ceramic body cannot meet the requirement of high strength. Mansourci compares XRD spectra of the muscovite filler and the muscovite/silicone rubber composite system after being treated at 600 ℃, compared with the filler, the composite system after being treated at high temperature shows a characteristic peak of an amorphous structure at about 22 degrees, and shows new characteristic peaks at 21 degrees, 29.5 degrees, 34.5 degrees, 36-37 degrees, 39-40 degrees, 45 degrees and 50 degrees, and the results show that muscovite and silicone rubber can react to form a new structure after being treated at high temperature. In contrast to the untreated sample, the characteristic peak at 12℃in the XRD spectrum of the muscovite/silicone rubber system after treatment at 1000℃disappeared, which peak was attributed to SiO 2 Illustrating mica and SiO during ceramization 2 The ceramic body structure is formed by eutectic reaction. However, the related data do not further analyze the newly appeared characteristic peaks, and the attribution of the new characteristic peaks of XRD is not clear, so that the formula design of the ceramifiable silicon rubber cannot be effectively referenced and consulted.
In summary, although there is a lot of research on the ceramifiable silicone rubber, the research on the new crystal phase in the ceramic forming process of the silicone rubber is insufficient, and the ceramifiable silicone rubber having a remarkable new XRD peak after calcination is lacking.
Disclosure of Invention
Aiming at the defects in the prior art of the ceramic silicon rubber formula, the invention provides ceramic silicon rubber. The ceramic silicon rubber is mainly prepared by compounding organic silicon rubber compound, ceramic powder and a forming agent Tao Chuji, and has the advantages of simple and controllable process and suitability for industrial production. The ceramic-like silicon rubber generates a hard ceramic body after high-temperature calcination, the volume change rate before and after calcination is low, and obvious crystallization peaks appear in an XRD spectrogram of the ceramic body after calcination, which indicates that the ceramic-like silicon rubber has obvious ceramic-like conversion during calcination.
Summary of The Invention
The invention provides a ceramic silicon rubber, which takes organosilicon mixing rubber as a basic component, and mainly researches and selects the composition of ceramic powder and a ceramic powder Tao Chuji, and generates a new ceramic phase after high-temperature calcination, so that the ceramic silicon rubber has good mechanical property, impact resistance, high temperature resistance, flame resistance, compactness, no obvious cracking, low ceramic temperature and small volume expansion rate. The ceramic silicon rubber of the invention forms a compact ceramic layer through the interaction of the silicon rubber and inorganic filler under the action of Tao Chuji during high-temperature calcination, and an obvious new crystallization peak can be seen in an XRD spectrum, which indicates that a new ceramic phase is generated. The ceramic silicon rubber has small volume change rate and high hardness after high-temperature calcination, and shows excellent high-temperature resistance.
Detailed Description
The technical scheme of the invention is as follows:
the ceramic silicone rubber comprises the following components in parts by weight:
100 parts of raw silicone rubber, 5-25 parts of white carbon black, 1-10 parts of vulcanizing agent, 20-400 parts of ceramifiable powder and Tao Chuji-100 parts of ceramifiable powder;
the ceramic powder comprises the following components in parts by weight: 5-120 parts of glass powder, 5-200 parts of magnesium hydroxide, 5-200 parts of aluminum hydroxide, 1-20 parts of iron oxide and 1-20 parts of phenyl silicone oil;
further limiting the mole ratio of the magnesium hydroxide, the aluminum hydroxide and the Mg, the Al and the Si in the raw rubber of the silicon rubber in the components to be: 0.4-0.6:1:2-5.
According to the invention, the silicone rubber raw rubber is preferably various silicone rubber raw rubber and a blending system of the silicone rubber raw rubber and other materials, and comprises peroxide type hot vulcanized silicone rubber raw rubber, addition type hot vulcanized silicone rubber raw rubber, condensation type room temperature vulcanized silicone rubber raw rubber, addition type room temperature vulcanized silicone rubber raw rubber and a blending system of the four types of silicone rubber mixed rubber and other materials.
According to the invention, preferably, the raw silicone rubber is peroxide-type raw thermal vulcanized silicone rubber or addition-type raw thermal vulcanized silicone rubber.
According to the present invention, it is preferable that the vulcanizing agent is a vulcanizing agent capable of normally vulcanizing a raw silicone rubber, and is different depending on the kind of raw silicone rubber, for example, a peroxide type hot vulcanizing raw silicone rubber uses bis-2, 4, bis-2, 5, BPO, etc., and an addition type vulcanizing agent used for vulcanizing a raw silicone rubber is a chloroplatinic acid series compound.
According to the invention, preferably, the ceramic powder is the ceramic powder compounded according to the formula disclosed by the invention; further preferably, in the composition of the ceramifiable powder, the molar ratio of Mg to Al elements is: 0.45-0.55:1.
According to the invention, preferably, the molar ratio of magnesium hydroxide, aluminum hydroxide and Mg, al and Si in the raw rubber of the ceramic silicon rubber is as follows: 0.45-0.55:1:2-5.
According to the present invention, preferably, the white carbon black composition is preferably 5 to 20 parts. The addition of the white carbon black can obviously improve the mechanical properties of the silicon rubber.
According to the present invention, in the ceramic powder composition, the phenyl silicone oil composition is preferably 1 to 10 parts. The phenyl silicone oil has good high temperature resistance and flame resistance, can improve the ignition point of the silicone rubber to a certain extent as an additive, and can self-extinguish after being ignited.
According to the invention, preferably, the component Tao Chuji is a boron compound, and further preferably boric acid, zinc borate and sodium borate; most preferably zinc borate;
preferably, the addition amount of the component Tao Chuji is preferably 1 to 50 parts, more preferably 1 to 30 parts.
According to the invention, it is preferable that the ceramic silicone rubber component composition further comprises other fillers or auxiliary agents, wherein the other fillers or auxiliary agents are various additives for enhancing or not significantly reducing the performance of the silicone rubber, and the additives comprise a thermal oxygen stabilizer, a flame retardant, a foaming agent, a deep curing agent, a pigment, a plasticizer and the like.
According to the invention, the preparation method of the ceramic silicon rubber comprises the following steps:
mixing raw silicone rubber, white carbon black, ceramic powder and Tao Chuji, adding vulcanizing agent, and vulcanizing.
The principle of the invention is as follows:
the invention adds proper amount of ceramic powder including glass powder, magnesium hydroxide, phenyl silicone oil and other fillers into the silicon rubber, and under the action of Tao Chuji boron compound, the three elements Mg, al and Si can just generate MgAl when the silicon rubber is calcined at high temperature 2 Si 4 O 12 And (5) crystallizing. When the molar ratio of Mg, al and Si in the ceramifiable silicon rubber is in the range of 0.4-0.6:1:2-5, the generated crystallization peak is obvious, and the sintered product has the characteristics of high hardness and small volume change rate. A slight excess of Mg element generally forms magnesium oxide. A slight excess of Al element generally forms meta-aluminates. The two structures have little influence on the ceramic performance of the ceramic silicon rubber when the content is low (namely, the molar ratio of the two elements of Mg and Al is slightly deviated from 0.5:1); however, when the contents of these two structures are large, the hardness of the sintered body is low due to weak forces between different inorganic phases. Therefore, the molar ratio of the two elements of Mg and Al should be 0.4-0.6:1. When the amount of glass powder and white carbon black in the ceramifiable silicon rubber is small, if the molar ratio of the three elements of Mg, al and Si is in the range of 0.4-0.6:1:2-5, a large amount of MgAl is generated in the sinter 2 Si 4 O 12 Crystallization (shown in figure 4 of the specification); when the amount of glass powder and white carbon black in the ceramifiable silicone rubber is large, the white carbon black is SiO 2 The structure is difficult to participate in MgAl 2 Si 4 O 12 In the formation of the crystals, therefore, a large amount of MgAl can be generated in the sinter only when the amounts of Si elements in the white carbon black and the glass powder are subtracted, i.e., the molar ratio of the magnesium hydroxide, the aluminum hydroxide and the Mg, the Al and the Si in the raw silicone rubber in the components is 0.4-0.6:1:2-5 2 Si 4 O 12 And (5) crystallizing. In summary, the molar ratio of the three elements of Mg, al and Si in the ceramifiable silicone rubber component is: 0.4-0.6:1:2-5.
The addition of the white carbon black can obviously improve the tensile strength and the hardness of the silicon rubber, and the addition amount of the white carbon black can be adjusted according to the use requirement of the ceramic silicon rubber. The low-melting glass powder can promote the sinter of the silicon rubber to form a mobile phase, and permeate into a solid-phase structure of the inorganic filler to be bonded, so that a high-strength ceramic layer is formed, and the strength of the ceramic layer is increased along with the rise of temperature. The phenyl silicone oil has good high temperature resistance and flame resistance, can improve the ignition point of the silicone rubber to a certain extent as an additive, and can self-extinguish after being ignited. The Tao Chuji boron compound is thermally decomposed at high temperature to generate boron oxide, so that the rapid decomposition of the silicon rubber can be promoted, the temperature for forming the ceramic layer is reduced, and the strength of the formed ceramic layer is improved to a certain extent.
The beneficial effects of the invention are as follows:
1. the ceramic silicon rubber of the invention ensures that the silicon rubber can generate a large amount of MgAl after high-temperature calcination because the proportion of Mg, al and Si in the formula is precisely limited 2 Si 4 O 12 Crystallization, thus the sinter has higher hardness, and the conversion from rubber to ceramic is realized.
2. The hard ceramic layer produced after the ceramic silicon rubber is burned has stable structure, obvious XRD crystallization peak, good compactness, no obvious cracking and adhesive force, and can be wrapped on the outer layer of the burned object, and the protective layer prevents the flame from further burning and isolates the escape of cracking volatile matters and protects the burned object from being damaged by strong fire.
3. The ceramic silicone rubber has good processing and forming properties, and can be processed into various needed molded and extruded products. The ceramifiable silicone rubber has the basic properties of silicone rubber when used at room temperature, such as excellent weatherability, excellent insulating properties, corona resistance and arc resistance.
4. The ceramic silicone rubber of the invention does not generate toxic gas and smoke when burning, and has self-extinguishing property. The ceramic silicone rubber has small volume expansion rate after being burned, and can maintain the original shape of the material.
5. The ceramic silicon rubber has simple preparation process and is easy for industrial production, and can be used for wire and cable insulation coating materials, fireproof isolation inner decorations for electronic and electric appliance equipment, various fireproof components and building decoration materials.
Drawings
FIG. 1 is a photograph of comparative example 3, example 1 and comparative example 1 of test example 1 at room temperature before calcination.
FIG. 2 is a photograph of comparative example 3, example 1 and comparative example 1 of test example 1 after calcination at 800 ℃.
FIG. 3 is an XRD pattern of the sample of comparative example 3 in test example 1 after calcination at 800 ℃.
FIG. 4 is an XRD pattern of the sample of example 1 of test example 1 after calcination at 800 ℃.
FIG. 5 is an XRD pattern of the sample of comparative example 1 in test example 1 after calcination at 800 ℃.
Detailed Description
The invention is further illustrated by, but not limited to, the following specific examples.
The starting materials used in the examples were either conventional commercially available starting materials or were synthesized according to the literature reference methods.
Examples 1 to 3
The preparation method of the ceramic silicon rubber comprises the following steps: mixing raw silicone rubber, white carbon black, ceramic powder and Tao Chuji on a machine uniformly, then adding a vulcanizing agent, and vulcanizing according to the type characteristics of the organosilicon compound.
Wherein: the raw silicone rubber is peroxide type hot vulcanized silicone rubber compound, addition type hot vulcanized silicone rubber compound or addition type room temperature vulcanized silicone rubber compound, when the organic silicone compound is peroxide type hot vulcanized silicone rubber, the vulcanizing agent is bis-2, 4, bis-2, 5 or BPO, and when the organic silicone compound is addition type vulcanized silicone rubber, the vulcanizing agent is chloroplatinic acid series compound.
The compositions of the components in parts by mass of examples 1 to 3 are shown in Table 1.
Comparative examples 1 to 3
Comparative examples 1 to 3 were prepared in the same manner as in example 1, and the composition of the components in parts by mass is shown in Table 1.
TABLE 1 ceramifiable Silicone rubber formulation and ceramifiability
Description: the 1# raw rubber is methyl vinyl silicone rubber raw rubber with the molecular weight of 70 ten thousand and the vinyl content of 0.23 percent; the No. 2 raw rubber is methyl vinyl silicone rubber raw rubber with the molecular weight of 10 ten thousand and the vinyl content of 0.30 percent; the No. 1 vulcanizing agent is a double 2,4 vulcanizing agent; the No. 2 vulcanizing agent is chloroplatinic acid vulcanizing agent.
Test example 1
As shown in fig. 1, photographs of the comparative example 3 sample, the example 1 sample, and the comparative example 1 sample at room temperature are shown in this order from the left to the right. Photographs of the three samples after calcination at 800 ℃ are shown in fig. 2.
As can be seen from fig. 2, the sample of example 1 shows ceramic forming property after high temperature calcination and has a small volume change rate, the sample of comparative example 3 shows chipping on the surface after calcination, and the sample of example 1 shows stone-like morphology after calcination. Whereas comparative example 1 became a broken residue after calcination at high temperature, it did not have ceramic forming properties.
XRD patterns of the comparative example 3 sample, the example 1 sample and the comparative example 1 sample after calcination at 800 ℃ were tested as shown in fig. 3, 4 and 5, respectively. Wherein:
FIG. 3 is an XRD pattern of the sample of comparative example 3 calcined at 800℃and it can be seen that a significant XRD crystallization peak appears in the calcined sample, while SiO is present in the sample 2 Is very pronounced;
FIG. 4 is an XRD pattern of the sample of example 1 calcined at 800℃and it can be seen that XRD crystallization peaks are particularly pronounced in the calcined sample (in contrast to SiO) 2 Less pronounced diffraction peaks) and further analysis of XRD crystallization peaks shows that the crystallization peaks correspond to MgAl 2 Si 4 O 12 Crystallization, which indicates that in this sample, siO is caused by the formation of a large number of new silicate inorganic phases 2 The phases are mutually connected, so that the ceramic performance is relatively excellent;
FIG. 5 is an XRD pattern of the sample of comparative example 1 after calcination at 800℃and it can be seen thatThe sample after calcination was only SiO 2 XRD diffraction peaks of (2) without crystallization peaks. This explains the reason why the sinter of the comparative example 1 sample breaks after calcination.
The performance test result shows that the ceramic silicon rubber prepared by the invention has good ceramic property. Compared with the existing ceramic silicon rubber, the formula of the ceramic silicon rubber has the advantages that the volume change rate of residues after high-temperature calcination is small, the hardness is high, and an obvious crystallization peak is shown in XRD test; the silicon rubber has the advantages of excellent comprehensive performance, simple working procedure, unexpected effect, great innovation and convenience for industrialized mass production of ceramic silicon rubber.
Claims (10)
1. The ceramic silicon rubber is characterized by comprising the following components in parts by weight:
100 parts of raw silicone rubber, 5-25 parts of white carbon black, 1-10 parts of vulcanizing agent, 20-400 parts of ceramifiable powder and Tao Chuji-100 parts of ceramifiable powder;
the ceramic powder comprises the following components in parts by weight: 5-120 parts of glass powder, 5-200 parts of magnesium hydroxide, 5-200 parts of aluminum hydroxide, 1-20 parts of iron oxide and 1-20 parts of phenyl silicone oil;
the molar ratio of the magnesium hydroxide, the aluminum hydroxide and the silicon rubber raw rubber to the Mg, the Al and the Si is as follows: 0.4-0.6:1:2-5.
2. The ceramifiable silicone rubber of claim 1, wherein the silicone rubber green rubber is one of a peroxide-type thermally vulcanized silicone rubber green rubber, an addition-type thermally vulcanized silicone rubber green rubber, a condensation-type room temperature vulcanized silicone rubber green rubber, and an addition-type room temperature vulcanized silicone rubber green rubber.
3. The ceramifiable silicone rubber according to claim 2, wherein the vulcanizing agent used for the peroxide-type thermally vulcanized silicone rubber green is bis-2, 4, bis-2, 5 or BPO, and the vulcanizing agent used for the addition-type thermally vulcanized silicone rubber green and the addition-type room temperature vulcanized silicone rubber green is chloroplatinic acid.
4. The ceramic-applicable silicone rubber according to claim 1, wherein the molar ratio of magnesium hydroxide, aluminum hydroxide and three elements of Mg, al and Si in the raw silicone rubber is: 0.45-0.55:1:2-5.
5. The ceramifiable silicone rubber according to claim 1, wherein the white carbon black comprises 5-20 parts.
6. The ceramifiable silicone rubber according to claim 1, wherein the phenyl silicone oil composition is 1-10 parts of the ceramifiable powder composition.
7. The ceramifiable silicone rubber of claim 1, wherein the component Tao Chuji is one or more of boric acid, zinc borate, sodium borate.
8. The ceramifiable silicone rubber according to claim 1, wherein Tao Chuji is added in an amount of 1 to 50 parts.
9. The ceramifiable silicone rubber according to claim 1, wherein the ceramifiable silicone rubber component composition further comprises other fillers or auxiliary agents, wherein the other fillers or auxiliary agents are one or more of thermal oxygen stabilizers, flame retardants, foaming agents, deep curing agents, pigments and plasticizers.
10. The method for preparing the ceramic-applicable silicone rubber according to claim 1, comprising the following steps:
mixing raw silicone rubber, white carbon black, ceramic powder and Tao Chuji, adding vulcanizing agent, and vulcanizing.
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Inventor after: Lu Haifeng Inventor after: Cao Yuhang Inventor after: Lan Yirou Inventor after: Huang Tingting Inventor after: Fu Pengxiao Inventor after: Xing Xiaoxuan Inventor after: Cao Yingjie Inventor after: Wang Jingying Inventor after: Lu Haoran Inventor after: Guo Kaixuan Inventor after: Guo Hanbo Inventor before: Huang Tingting Inventor before: Lan Yirou Inventor before: Lu Haifeng Inventor before: Fu Pengxiao Inventor before: Xing Xiaoxuan Inventor before: Cao Yingjie Inventor before: Wang Jingying Inventor before: Lu Haoran Inventor before: Guo Kaixuan Inventor before: Guo Hanbo Inventor before: Cao Yuhang |