Special long-acting temperature-resistant and corrosion-resistant silicone rubber for photovoltaic laminating machine silica gel plate and preparation method of special long-acting temperature-resistant and corrosion-resistant silicone rubber

Abstract

The invention discloses special long-acting temperature-resistant and corrosion-resistant silicone rubber for a photovoltaic laminating machine silica gel plate and a preparation method of the special long-acting temperature-resistant and corrosion-resistant silicone rubber, and belongs to the technical field of silicone rubber. Comprising silicone rubber base materials and silicone rubber auxiliary materials, the silicone rubber auxiliary material comprises the following components: an auxiliary material fusion agent, a colloid regulator, a modified conditioning agent and a nanofiller, the auxiliary material fusion agent is prepared by mixing xylene and petroleum ether, and the modified conditioning agent comprises polydimethylsiloxane-hydroxyl and hydroxyl-terminated methyl phenyl silicone oil; the modified conditioning agent comprises polytetrafluoroethylene and vinyl silicone resin; the nano filler comprises nano montmorillonite, nano silicon dioxide and nano aluminum hydroxide; according to the long-acting temperature-resistant corrosion-resistant silicone rubber special for the photovoltaic laminating machine silica gel plate and the preparation method of the long-acting temperature-resistant corrosion-resistant silicone rubber, the silicone rubber meeting the requirements of the photovoltaic laminating machine silica gel plate can be prepared, the lamination deformation resistance requirement of the photovoltaic laminating machine silica gel plate is improved, and the service life of the photovoltaic laminating machine silica gel plate is prolonged.

Description

Technical Field

[0001] The invention specifically relates to a long-lasting heat-resistant and corrosion-resistant silicone rubber special for a photovoltaic laminator silicone plate and a preparation method thereof, belonging to the technical field of silicone rubber. Background Art

[0002] Photovoltaic laminators are equipment used to process solar panels. During the production of solar panels, materials such as silicon wafers, glass, and EVA need to be stacked together and hot-pressed at high temperatures to form solar panels. In this process, the silicone plate plays a supporting and separating role, ensuring that each layer of material can be evenly stressed, thereby ensuring the quality of the solar panel. Since the silicone plate of the photovoltaic laminator works in a high temperature and certain corrosive environment, the silicone plate of the photovoltaic laminator is subject to factors such as pyrolysis and erosion, and is prone to local defects, resulting in hot pressing defects of silicon wafers, glass, and EVA during the high temperature hot pressing process. To this end, it is necessary to improve the silicone rubber material of the silicone plate of the photovoltaic laminator. The existing high-temperature resistant silicone rubber, such as: China Patent Authorization Announcement No.: CN115746568B, discloses a high-temperature resistant silicone rubber material and its preparation method, including the following component raw materials: methyl vinyl raw rubber, white carbon black, hydroxyl silicone oil, vulcanizing agent and nano zirconium oxide of metal tungsten oxide; under the action of high temperature for a long time, it has the advantage of being able to greatly maintain the physical properties of silicone rubber, and the operation is simple; this structure cannot guarantee corrosion resistance, and after the addition of nano zirconium oxide, the mechanical properties of the silicone rubber material cannot be guaranteed. Summary of the invention

[0003] In order to solve the above problems, the present invention proposes a long-lasting heat-resistant and corrosion-resistant silicone rubber specially used for silicone plates of photovoltaic laminators and a preparation method thereof, which can prepare silicone rubber that meets the requirements of silicone plates of photovoltaic laminators, improve the lamination deformation resistance of silicone plates of photovoltaic laminators and increase the service life of silicone plates of photovoltaic laminators.

[0004] The long-lasting heat-resistant and corrosion-resistant silicone rubber specially used for the photovoltaic laminator silicone plate of the present invention comprises a silicone rubber base material and a silicone rubber auxiliary material; the silicone rubber auxiliary material comprises the following component proportions: The dosage of each component is based on 100g silicone rubber base material, including: Auxiliary material fusing agent, the dosage of the auxiliary material fusing agent is 45-58 ml, the auxiliary material fusing agent comprises a mixture of xylene and petroleum ether, and the ratio of xylene to petroleum ether is 1:2-4; A colloid regulator, wherein the dosage of the colloid regulator is 6-8 g; the modified modulator comprises polydimethylsiloxane-hydroxyl and terminal hydroxymethylphenyl silicone oil; the ratio of the polydimethylsiloxane-hydroxyl and terminal hydroxymethylphenyl silicone oil is 1:1-3; A modified modulator, wherein the dosage of the modified modulator is 6 to 10 g; the modified modulator comprises polytetrafluoroethylene and vinyl silicone resin, and the ratio of polytetrafluoroethylene to vinyl silicone resin is 1:1 to 1.3; The nano filler has a dosage of 12-15 g and comprises nano montmorillonite, nano silicon dioxide and nano aluminum hydroxide; the ratio of the nano montmorillonite, nano silicon dioxide and nano aluminum hydroxide is 3:1-3:1-3.

[0005] Silicon dioxide and aluminum hydroxide are added to the silicone rubber base material. After silicon dioxide and aluminum hydroxide are dispersed in the silicone rubber base material, the acid and salt resistance of the silicone rubber base material can be improved. After adding polytetrafluoroethylene, the alkali resistance of the silicone rubber base material can be improved, thereby improving the overall corrosion resistance of the silicone rubber base material; adding nano-montmorillonite to the silicone rubber base material can increase the temperature of the silicone rubber base material at 5% weight loss (Td, 5%). Since montmorillonite has general compatibility with the silicone rubber base material, its dispersibility in the silicone rubber base material is general and it is easy to generate bubbles. Therefore, by using nano-level montmorillonite, silicon dioxide and aluminum hydroxide, and using nano-montmorillonite, nano-silicon dioxide and nano-aluminum hydroxide; at the same time, using auxiliary material fusion agent to eliminate bubbles, the solvent resistance and heat resistance of the silicone rubber product can be improved, and the original mechanical properties of the silicone rubber base material can be maintained; the auxiliary material fusion agent is combined with xylene and petroleum ether, so that the volatilization rates interfere with each other, so as to promote the full volatilization and defoaming of the auxiliary material fusion agent; The modified modulators include polytetrafluoroethylene and vinyl silicone resin. Both polytetrafluoroethylene and vinyl silicone resin can improve the heat resistance of silicone rubber base material. By combining montmorillonite, polytetrafluoroethylene and vinyl silicone resin, the processed silicone rubber has a long-lasting heat resistance effect. Polytetrafluoroethylene can resist most corrosive substances such as acids, alkalis, and salts. Vinyl silicone resin is a resin synthesized by polymerizing ethylene monomers. It can not only improve the heat resistance of silicone rubber, but also be fully dispersed in the rubber base material to form a centralized cross-linking effect, so that the silicone rubber base material, polytetrafluoroethylene and vinyl silicone resin are fully combined to form a high temperature and corrosion resistant dense layer on the surface of the silicone rubber, which can inhibit the degradation of the silicone rubber base material. After the modified modulator and nanofiller are added, the colloid regulator allows the silicone rubber base to maintain its own properties. Specifically, the two components of the modified modulator can react with the hydroxyl groups on the surface of silica, so that the dispersion of silica in silicone rubber is better, ensuring the strength of the silicone rubber base. At the same time, the terminal hydroxymethylphenyl silicone oil produces hydrogen bonds with the silicone rubber molecular chains. The cross-linking network formed by hydrogen bonds increases the cross-linking density of the silicone rubber base and improves the tear strength of the silicone rubber base. At the same time, due to the introduction of benzene rings into the terminal hydroxymethylphenyl silicone oil, the resilience of the silicone rubber base is increased. In addition, the molecular chain of polydimethylsiloxane-hydroxyl is short. After connecting the two silicone rubber molecular chains through hydrogen bonds, the flexibility of the silicone rubber base is increased, so that the silicone rubber base itself has good mechanical properties.

[0006] Furthermore, the silicone rubber base material includes 100 parts of methyl vinyl silicone rubber, 40 parts of fumed silica, and 0.7 parts of bis(250-80).

[0007] Furthermore, the silicone rubber base material and the silicone rubber auxiliary material are made into a surface layer rubber, which also includes a base layer rubber. The surface layer rubber is melt-bonded to the bottom surface of the base layer rubber, or melt-bonded to both sides of the base layer rubber to form a composite rubber.

[0008] Furthermore, the base rubber comprises a silicone rubber base material, to which an auxiliary material fusing agent and a modifying modulator are added in a proportion consistent with that of the surface layer rubber.

[0009] A method for preparing a long-lasting heat-resistant and corrosion-resistant silicone rubber for photovoltaic laminating machine silicone plates, which is used to prepare the long-lasting heat-resistant and corrosion-resistant silicone rubber for photovoltaic laminating machine silicone plates. The method is specifically as follows: S1, mixing, weighing raw materials according to the basic formula, adjusting the temperature of the mixing equipment to 110℃~120℃, controlling the speed to 40~50 rpm, then, adding methyl vinyl silicone rubber, fumed silica and colloid regulator in sequence, mixing for 15~20min; then, adding nano filler, modified modulator and auxiliary material fusion agent in sequence, adjusting the temperature of the mixing equipment to 120℃~130℃, controlling the speed to 60~80 rpm, mixing for 30~35min; S2, a double-roller mill, after the mixing is completed, the mixture is sent to a double-roller mill, the mixed rubber is sheeted, and the mixed rubber is left to stand for 2-3 hours; S3, aging of the mixed rubber and secondary dispersion of fillers. The mixed rubber prepared in S2 is sent to a hot oven for aging treatment. The temperature of the hot oven is increased from 120°C to 150°C, and the temperature is increased by 5°C every 5 minutes; and maintained at 150°C for 1.5-2 hours; after aging, the temperature is cooled to room temperature and left to stand for 10-15 hours; S4, secondary double-roller milling, re-milling on the double-roller mill to the mixing rubber roll, adding double 25, mixing evenly and then producing sheets to obtain the rubber to be vulcanized; S5. Vulcanization: The rubber to be vulcanized is sent to a two-roll open mill for re-refining until it is completely wrapped around the rolls. After the sheet is produced, a mixed rubber sheet is obtained, and the mixed rubber sheet is sent to a mold and vulcanized once on a flat vulcanizer at a vulcanization temperature of 175-180°C. After vulcanization for 10-15 minutes, it is allowed to stand at room temperature for 3 hours and then sent to a hot oven for terminal shaping again. The hot oven temperature is 185-200°C and kept warm for 1-2 hours. Finally, it is cooled to obtain the terminal product.

[0010] Furthermore, the mixed rubber sheet of the surface layer rubber prepared in S1 to S5 also includes the preparation of the mixed rubber sheet of the base layer rubber, and the preparation process is as follows: First, mixing is performed, raw materials are weighed according to the basic formula, the temperature of the mixing equipment is adjusted to 110°C~120°C, and the speed is controlled to 40~50 rpm. Then, methyl vinyl silicone rubber and fumed silica are added in sequence, and the mixing time is 15~20 min. Then, the modified modulator and auxiliary material fusion agent are added in sequence, the temperature of the mixing equipment is adjusted to 120°C~130°C, the speed is controlled to 60~80 rpm, and the mixing time is 30~35 min. After completing step S1, double-roller milling, mixed rubber aging, double-roller milling and pre-vulcanization milling are performed. The processing process and process parameters are consistent with steps S2 to S5 of the surface rubber. A mixed rubber sheet of the base rubber is obtained. Then, the mixed rubber sheet of the base rubber and the mixed rubber sheet of the surface rubber are hot pressed together to form a composite rubber body, and the composite rubber body is vulcanized and finally cooled to obtain the terminal product.

[0011] Compared with the prior art, the long-lasting heat-resistant and corrosion-resistant silicone rubber specially used for silicone plates of photovoltaic laminators of the present invention and its preparation method, the prepared silicone rubber, under the premise of ensuring the mechanical properties of silicone rubber, has long-lasting high temperature resistance and corrosion resistance in corrosive occasions; the silicone rubber can meet the requirements of silicone plates of photovoltaic laminators, and the processed silicone plates of photovoltaic laminators can meet the requirements of lamination anti-deformation and improve the service life of silicone plates of photovoltaic laminators. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a flowchart of the method for preparing the long-lasting heat-resistant and corrosion-resistant silicone rubber specially used for the silicone plate of the photovoltaic laminator of the present invention. DETAILED DESCRIPTION

[0013] like Figure 1 The long-lasting heat-resistant and corrosion-resistant silicone rubber for photovoltaic laminator silicone plates shown in the figure comprises a silicone rubber base material and a silicone rubber auxiliary material; the silicone rubber auxiliary material comprises the following component proportions: The dosage of each component is based on 100g silicone rubber base material, including: Auxiliary material fusing agent, the dosage of the auxiliary material fusing agent is 45-58 ml, the auxiliary material fusing agent comprises a mixture of xylene and petroleum ether, and the ratio of xylene to petroleum ether is 1:2-4; A colloid regulator, wherein the dosage of the colloid regulator is 6-8 g; the modified modulator comprises polydimethylsiloxane-hydroxyl and terminal hydroxymethylphenyl silicone oil; the ratio of the polydimethylsiloxane-hydroxyl and terminal hydroxymethylphenyl silicone oil is 1:1-3; A modified modulator, wherein the dosage of the modified modulator is 6 to 10 g; the modified modulator comprises polytetrafluoroethylene and vinyl silicone resin, and the ratio of polytetrafluoroethylene to vinyl silicone resin is 1:1 to 1.3; The nano filler has a dosage of 12-15 g and comprises nano montmorillonite, nano silicon dioxide and nano aluminum hydroxide; the ratio of the nano montmorillonite, nano silicon dioxide and nano aluminum hydroxide is 3:1-3:1-3.

[0014] Silicon dioxide and aluminum hydroxide are added to the silicone rubber base material. After silicon dioxide and aluminum hydroxide are dispersed in the silicone rubber base material, the acid and salt resistance of the silicone rubber base material can be improved. After adding polytetrafluoroethylene, the alkali resistance of the silicone rubber base material can be improved, thereby improving the overall corrosion resistance of the silicone rubber base material; adding nano-montmorillonite to the silicone rubber base material can increase the temperature of the silicone rubber base material at 5% weight loss (Td, 5%). Since montmorillonite has general compatibility with the silicone rubber base material, its dispersibility in the silicone rubber base material is general and it is easy to generate bubbles. Therefore, by using nano-level montmorillonite, silicon dioxide and aluminum hydroxide, and using nano-montmorillonite, nano-silicon dioxide and nano-aluminum hydroxide; at the same time, using auxiliary material fusion agent to eliminate bubbles, the solvent resistance and heat resistance of the silicone rubber product can be improved, and the original mechanical properties of the silicone rubber base material can be maintained; the auxiliary material fusion agent is combined with xylene and petroleum ether, so that the volatilization rates interfere with each other, so as to promote the full volatilization and defoaming of the auxiliary material fusion agent; The modified modulators include polytetrafluoroethylene and vinyl silicone resin. Both polytetrafluoroethylene and vinyl silicone resin can improve the heat resistance of silicone rubber base material. By combining montmorillonite, polytetrafluoroethylene and vinyl silicone resin, the processed silicone rubber has a long-lasting heat resistance effect. Polytetrafluoroethylene can resist most corrosive substances such as acids, alkalis, and salts. Vinyl silicone resin is a resin synthesized by polymerizing ethylene monomers. It can not only improve the heat resistance of silicone rubber, but also be fully dispersed in the rubber base material to form a centralized cross-linking effect, so that the silicone rubber base material, polytetrafluoroethylene and vinyl silicone resin are fully combined to form a high temperature and corrosion resistant dense layer on the surface of the silicone rubber, which can inhibit the degradation of the silicone rubber base material. After the modified modulator and nanofiller are added, the colloid regulator allows the silicone rubber base to maintain its own properties. Specifically, the two components of the modified modulator can react with the hydroxyl groups on the surface of silica, so that the dispersion of silica in silicone rubber is better, ensuring the strength of the silicone rubber base. At the same time, the terminal hydroxymethylphenyl silicone oil produces hydrogen bonds with the silicone rubber molecular chains. The cross-linking network formed by hydrogen bonds increases the cross-linking density of the silicone rubber base and improves the tear strength of the silicone rubber base. At the same time, due to the introduction of benzene rings into the terminal hydroxymethylphenyl silicone oil, the resilience of the silicone rubber base is increased. In addition, the molecular chain of polydimethylsiloxane-hydroxyl is short. After connecting the two silicone rubber molecular chains through hydrogen bonds, the flexibility of the silicone rubber base is increased, so that the silicone rubber base itself has good mechanical properties.

[0015] The silicone rubber base material comprises: 100 parts of methyl vinyl silicone rubber; 40 parts of fumed silica; Double 25 0.7 copies.

[0016] The silicone rubber base material and the silicone rubber auxiliary material are made into a surface layer rubber, which also includes a base layer rubber. The surface layer rubber is melt-bonded to the bottom surface of the base layer rubber, or melt-bonded to both sides of the base layer rubber to form a composite rubber.

[0017] The base rubber comprises a silicone rubber base material, to which an auxiliary material fusion agent and a modifying modulator having the same proportion as that of the surface layer rubber are added.

[0018] A method for preparing a long-lasting heat-resistant and corrosion-resistant silicone rubber for photovoltaic laminating machine silicone plates, which is used to prepare the long-lasting heat-resistant and corrosion-resistant silicone rubber for photovoltaic laminating machine silicone plates. The method is specifically as follows: S1, mixing, weighing raw materials according to the basic formula, adjusting the temperature of the mixing equipment to 110℃~120℃, controlling the speed to 40~50 rpm, then, adding methyl vinyl silicone rubber, fumed silica and colloid regulator in sequence, mixing for 15~20min; then, adding nano filler, modified modulator and auxiliary material fusion agent in sequence, adjusting the temperature of the mixing equipment to 120℃~130℃, controlling the speed to 60~80 rpm, mixing for 30~35min; S2, a double-roller mill, after the mixing is completed, the mixture is sent to a double-roller mill, the mixed rubber is sheeted, and the mixed rubber is left to stand for 2-3 hours; S3, aging of the mixed rubber and secondary dispersion of fillers. The mixed rubber prepared in S2 is sent to a hot oven for aging treatment. The temperature of the hot oven is increased from 120°C to 150°C, and the temperature is increased by 5°C every 5 minutes; and maintained at 150°C for 1.5-2 hours; after aging, the temperature is cooled to room temperature and left to stand for 10-15 hours; S4, secondary double-roller milling, re-milling on the double-roller mill to the mixing rubber roll, adding double 25, mixing evenly and then producing sheets to obtain the rubber to be vulcanized; S5. Vulcanization: The rubber to be vulcanized is sent to a two-roll open mill for re-refining until it is completely wrapped around the rolls. After the sheet is produced, a mixed rubber sheet is obtained, and the mixed rubber sheet is sent to a mold and vulcanized once on a flat vulcanizer at a vulcanization temperature of 175-180°C. After vulcanization for 10-15 minutes, it is allowed to stand at room temperature for 3 hours and then sent to a hot oven for terminal shaping again. The hot oven temperature is 185-200°C and kept warm for 1-2 hours. Finally, it is cooled to obtain the terminal product.

[0019] The mixed rubber sheet of the surface layer rubber prepared in S1 to S5 also includes the preparation of the mixed rubber sheet of the base layer rubber, and the preparation process is as follows: First, mixing is performed, raw materials are weighed according to the basic formula, the temperature of the mixing equipment is adjusted to 110°C~120°C, and the speed is controlled to 40~50 rpm. Then, methyl vinyl silicone rubber raw rubber and fumed silica are added in sequence, and the mixing time is 15~20 min. Then, the modified modulator and auxiliary material fusion agent are added in sequence, the temperature of the mixing equipment is adjusted to 120°C~130°C, the speed is controlled to 60~80 rpm, and the mixing time is 30~35 min. After completing step S1, double-roller milling, mixed rubber aging, double-roller milling and pre-vulcanization milling are performed. The processing process and process parameters are consistent with steps S2 to S5 of the surface rubber. A mixed rubber sheet of the base rubber is obtained. Then, the mixed rubber sheet of the base rubber and the mixed rubber sheet of the surface rubber are hot pressed together to form a composite rubber body, and the composite rubber body is vulcanized and finally cooled to obtain the terminal product.

[0020] The long-lasting heat-resistant and corrosion-resistant silicone rubber specially used for the photovoltaic laminator silicone plate of the present invention keeps the silicone rubber base material unchanged, and takes 100g of the silicone rubber base material as the addition basis, and adds the silicone rubber auxiliary material to 100g of the silicone rubber base material; the silicone rubber auxiliary material composition ratio is as follows: Table 1: Examples and comparison ratios of silicone rubber auxiliary materials

[0021] The long-lasting heat-resistant and corrosion-resistant silicone rubber component for photovoltaic laminator silicone plate adopts Examples 1 to 6 and Comparative Examples 1 to 3, and according to the preparation method of long-lasting heat-resistant and corrosion-resistant silicone rubber for photovoltaic laminator silicone plate, 9 groups of rubber samples of Examples 1 to 6 and Comparative Examples 1 to 3 are prepared; the method is specifically as follows: S1, mixing, weighing raw materials according to the basic formula, adjusting the temperature of the mixing equipment to 150 ° C, controlling the speed to 45 rpm, then, adding methyl vinyl silicone rubber, fumed silica and colloid regulator in sequence, mixing for 20 minutes; then, adding nano filler, modification modulator and auxiliary material fusion agent in sequence, adjusting the temperature of the mixing equipment to 120 ° C, controlling the speed to 80 rpm, and mixing for 30 minutes; S2, a double-roll mill, after the mixing is completed, the mixture is sent to a double-roll mill, the mixed rubber is sheeted, and the mixed rubber is allowed to stand for 3 hours; S3, aging of the mixed rubber and secondary dispersion of fillers. The mixed rubber prepared in S2 is sent to a hot oven for aging treatment. The temperature of the hot oven is increased from 120°C to 150°C, and the temperature is increased by 5°C every 5 minutes; and maintained at 150°C for 2 hours; after aging, the temperature is cooled to room temperature and left to stand for 10 hours; S4, secondary double-roller milling, re-milling on the double-roller mill to the mixing rubber roll, adding double 25, mixing evenly and then producing sheets to obtain the rubber to be vulcanized; S5. Vulcanization: The rubber to be vulcanized is sent to a double-roll open mill for re-refining until it is completely wrapped around the rolls. After the sheet is produced, a mixed rubber sheet is obtained, and the mixed rubber sheet is sent to a mold and vulcanized once on a flat vulcanizer at a vulcanization temperature of 180°C. After vulcanization for 15 minutes, it is allowed to stand at room temperature for 3 hours and then sent to a hot oven for terminal shaping at a hot oven temperature of 190°C for 2 hours. Finally, it is cooled to obtain the terminal product (9 groups of silicone rubber samples).

[0022] Next, the performance of the 9 groups of silicone rubber samples prepared was tested. The test process is as follows: (1) Mechanical properties test: The tensile properties of the samples were tested using an electronic tensile testing machine in accordance with GB / T528-2009 at a rate of 500 mm / min. The tearing properties of the samples were tested in accordance with GB / T529-2008 at a rate of 500 mm / min. The hardness of the samples was tested using a Shore A hardness tester in accordance with GB / T531.2-2009.

[0023] (2) Impact rebound test: The impact rebound of the sample was tested in accordance with GB / T1681-2009 standard.

[0024] (3) Thermal gravimetric analysis: Thermogravimetric analysis was used for testing.

[0025] (4) Heat and oxygen aging resistance test: According to GB / T3512-2001 standard, the tensile strength, elongation at break and hardness are tested to judge the aging resistance.

[0026] The test results of silicone rubber samples are as follows: Table 2: Example and comparative test results of silicone rubber samples

[0027] It can be seen from the above table that the mechanical properties (tensile strength, elongation at break, tear strength, rebound rate and hardness) of the silicone rubber prepared in the present application can meet the pressure and rebound requirements of the silicone plate of the photovoltaic laminator; the long-lasting heat-resistant and corrosion-resistant silicone rubber specially used for the silicone plate of the photovoltaic laminator of the present invention, when evaluating the temperature resistance, includes the initial decomposition temperature index and the thermal durability index. It can be seen from the above test that the initial decomposition temperature is 437°C~449°C, the initial decomposition temperature is high, the high temperature resistance is strong, and it can withstand the instantaneous high temperature of the laminator; and in the thermal durability test, the initial decomposition temperature is used for testing. At the initial decomposition temperature, it takes time for the silicone rubber sample to lose 5% of its mass. It can be seen from the test results that Examples 1 to 6 can all reach more than 11 days, and in the thermal durability test, the decomposition time of 5% mass loss can be greatly improved below this temperature. If it is used in the current working environment and replacement frequency of the silicone plate of the photovoltaic laminator, the replacement cycle can be greatly extended. When the long-lasting heat-resistant and corrosion-resistant silicone rubber specially used for the photovoltaic laminator silicone plate of the present invention is subjected to a corrosion resistance test, the test is conducted with reference to GB 1763-1979 "Determination of Chemical Resistance of Paint Film", and the rubber samples prepared in Examples 1 to 6 and Comparative Example 1 are subjected to corrosion resistance tests. During the test, the rubber samples prepared in Examples 1 to 6 and Comparative Example 1 are sampled, and three groups of samples are prepared in each Example and Comparative Example 1, respectively, and are sequentially sent into 3% H2SO4 acid solution, 3% NaOH alkali solution and 3% NaCl salt solution for immersion test, the immersion time is one week, and the rubber samples are observed after immersion, and it is obtained that the rubber samples of Examples 1 to 6 have no corrosion phenomenon after being immersed in acid solution, alkali solution and salt solution for one week; the rubber sample of Comparative Example 1 has no corrosion phenomenon after being immersed in acid solution and salt solution for one week; and corrosion phenomenon occurs in alkali solution.

[0028] The above embodiments are only preferred implementations of the present invention, so any equivalent changes or modifications made according to the structures, features and principles described in the scope of application of the present invention are included in the scope of application of the present invention.

Claims

1. A long-lasting heat-resistant and corrosion-resistant silicone rubber specially used for photovoltaic laminator silicone plates, comprising a silicone rubber base material and a silicone rubber auxiliary material; characterized in that: The silicone rubber auxiliary material includes the following component proportions: The dosage of each component is based on 100g silicone rubber base material, including: Auxiliary material fusing agent, the dosage of the auxiliary material fusing agent is 45-58 ml, the auxiliary material fusing agent comprises a mixture of xylene and petroleum ether, and the ratio of xylene to petroleum ether is 1:2-4; A colloid regulator, wherein the dosage of the colloid regulator is 6-8 g; the modified modulator comprises polydimethylsiloxane-hydroxyl and terminal hydroxymethylphenyl silicone oil; the ratio of the polydimethylsiloxane-hydroxyl and terminal hydroxymethylphenyl silicone oil is 1:1-3; A modified modulator, wherein the dosage of the modified modulator is 6 to 10 g; the modified modulator comprises polytetrafluoroethylene and vinyl silicone resin, and the ratio of polytetrafluoroethylene to vinyl silicone resin is 1:1 to 1.3; The nano filler has a dosage of 12-15 g and comprises nano montmorillonite, nano silicon dioxide and nano aluminum hydroxide; the ratio of the nano montmorillonite, nano silicon dioxide and nano aluminum hydroxide is 3:1-3:1-3.

2. The long-lasting heat-resistant and corrosion-resistant silicone rubber for photovoltaic laminator silicone plates according to claim 1 is characterized by: The silicone rubber base material comprises 100 parts of methyl vinyl silicone rubber, 40 parts of fumed silica and 0.7 parts of bis(250-80)diol.

3. The long-lasting heat-resistant and corrosion-resistant silicone rubber for photovoltaic laminator silicone plates according to claim 1 is characterized by: The silicone rubber base material and the silicone rubber auxiliary material are made into a surface layer rubber, which also includes a base layer rubber. The surface layer rubber is melt-bonded to the bottom surface of the base layer rubber, or melt-bonded to both sides of the base layer rubber to form a composite rubber.

4. The long-lasting heat-resistant and corrosion-resistant silicone rubber for photovoltaic laminator silicone plates according to claim 3 is characterized by: The base rubber comprises a silicone rubber base material, to which an auxiliary material fusion agent and a modifying modulator having the same proportion as that of the surface layer rubber are added.

5. A method for preparing a long-lasting heat-resistant and corrosion-resistant silicone rubber for photovoltaic laminator silicone plates, which is used to prepare the long-lasting heat-resistant and corrosion-resistant silicone rubber for photovoltaic laminator silicone plates as described in any one of claims 1 to 4, characterized in that: The method is specifically as follows: S1, mixing, weighing raw materials according to the basic formula, adjusting the temperature of the mixing equipment to 110℃~120℃, controlling the speed to 40~50 rpm, then, adding methyl vinyl silicone rubber, fumed silica and colloid regulator in sequence, mixing for 15~20min; then, adding nano filler, modified modulator and auxiliary material fusion agent in sequence, adjusting the temperature of the mixing equipment to 120℃~130℃, controlling the speed to 60~80 rpm, mixing for 30~35min; S2, a double-roller mill, after the mixing is completed, the mixture is sent to a double-roller mill, the mixed rubber is sheeted, and the mixed rubber is left to stand for 2-3 hours; S3, aging of the mixed rubber and secondary dispersion of fillers. The mixed rubber prepared in S2 is sent to a hot oven for aging treatment. The temperature of the hot oven is increased from 120°C to 150°C, and the temperature is increased by 5°C every 5 minutes; and maintained at 150°C for 1.5-2 hours; after aging, the temperature is cooled to room temperature and left to stand for 10-15 hours; S4, secondary double-roller milling, re-milling on the double-roller mill to the mixing rubber roll, adding double 25, mixing evenly and then producing sheets to obtain the rubber to be vulcanized; S5. Vulcanization: The rubber to be vulcanized is sent to a two-roll open mill for re-refining until it is completely wrapped around the rolls. After the sheet is produced, a mixed rubber sheet is obtained, and the mixed rubber sheet is sent to a mold and vulcanized once on a flat vulcanizer at a vulcanization temperature of 175-180°C. After vulcanization for 10-15 minutes, it is allowed to stand at room temperature for 3 hours and then sent to a hot oven for terminal shaping again. The hot oven temperature is 185-200°C and kept warm for 1-2 hours. Finally, it is cooled to obtain the terminal product.

6. The method for preparing long-lasting heat-resistant and corrosion-resistant silicone rubber for photovoltaic laminator silicone plates according to claim 5, characterized in that: The mixed rubber sheet of the surface layer rubber prepared in S1 to S5 also includes the preparation of the mixed rubber sheet of the base layer rubber, and the preparation process is as follows: First, mixing is performed, raw materials are weighed according to the basic formula, the temperature of the mixing equipment is adjusted to 110°C~120°C, and the speed is controlled to 40~50 rpm. Then, methyl vinyl silicone rubber and fumed silica are added in sequence, and the mixing time is 15~20 min. Then, the modified modulator and auxiliary material fusion agent are added in sequence, the temperature of the mixing equipment is adjusted to 120°C~130°C, the speed is controlled to 60~80 rpm, and the mixing time is 30~35 min. After completing step S1, double-roller milling, mixed rubber aging, double-roller milling and pre-vulcanization milling are performed. The processing process and process parameters are consistent with steps S2 to S5 of the surface rubber. A mixed rubber sheet of the base rubber is obtained. Then, the mixed rubber sheet of the base rubber and the mixed rubber sheet of the surface rubber are hot pressed together to form a composite rubber body, and the composite rubber body is vulcanized and finally cooled to obtain the terminal product.

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