High temperature resistant chloroprene rubber, preparation method and application thereof in hydraulic hose

Abstract

The invention discloses a high temperature resistant chloroprene rubber, a preparation method and its application in a hydraulic hose. The raw material components of the high temperature resistant chloroprene rubber include 100 parts of chloroprene rubber, 1-5 parts of a vulcanization accelerator, 3-6 parts of magnesium oxide, 3-6 parts of zinc oxide, 1-10 parts of protocatechuic acid-modified acrylate and 0.5-5 parts of modified ferrocerium composite oxide; the protocatechuic acid-modified acrylate has a structure as shown in the following formula (I); the modified ferrocerium composite oxide is obtained by modifying the ferrocerium composite oxide with a silane coupling agent. The high temperature resistant chloroprene rubber of the present application significantly improves the problems of poor stability and mechanical properties of conventional chloroprene rubber under high temperature conditions, and is thus applied to the heat-resistant layer material of the hydraulic hose.

Description

Technical Field

[0001] The invention belongs to the field of chloroprene rubber and relates to high-temperature resistant chloroprene rubber, a preparation method and application of the chloroprene rubber in a hydraulic hose. Background Art

[0002] Chloroprene rubber appears as milky white, beige or light brown flakes or blocks. It is an elastomer produced by α-polymerization of chloroprene (i.e. 2-chloro-1,3-butadiene) as the main raw material. Its good mechanical properties give it good application prospects; however, it still has the problem of rapid degradation of mechanical properties under high temperature conditions.

[0003] The patent with publication number CN110862591A discloses a high and low temperature resistant and anti-aging chloroprene rubber, which includes the following components by weight: 45-53 parts of chloroprene rubber, 5-8 parts of butyl rubber, 4-6 parts of polyether polyurethane rubber, 4-5.4 parts of light magnesium oxide, 5-6 parts of white carbon black, 26-31 parts of carbon black, 6-8.5 parts of plasticizer, 3-4.6 parts of octylated diphenylamine, 1-2.3 parts of cyclohexylthiophthalimide, 0.8-1.4 parts of zinc oxide, 0.5-0.8 parts of tetramethylthiuram disulfide, and 0.6-1.1 parts of ethylene thiourea. Although it improves the high temperature resistance to a certain extent, its high temperature resistance still needs to be further improved.

[0004] Therefore, it is still of great significance to develop a high-temperature resistant chloroprene rubber that can maintain high mechanical properties after heat treatment and a preparation method thereof. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention aims to provide a high temperature resistant chloroprene rubber and a preparation method and application thereof.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] One of the purposes of the present invention is to provide a high temperature resistant chloroprene rubber, wherein the raw material components of the high temperature resistant chloroprene rubber include 100 parts of chloroprene rubber, 1-5 parts of vulcanization accelerator (for example, 1 part, 2 parts, 3 parts, 4 parts, 5 parts), 3-6 parts of magnesium oxide (for example, 3 parts, 4 parts, 5 parts, 6 parts), 3-6 parts of zinc oxide (for example, 3 parts, 4 parts, 5 parts, 6 parts), 1-10 parts of protocatechuic acid-modified acrylate (for example, 1 part, 3 parts, 5 parts, 7 parts, 10 parts, etc.), and 0.5-5 parts of modified cerium-iron composite oxide (for example, 0.5 parts, 1 parts, 2 parts, 3 parts, 4 parts, 5 parts, etc.);

[0008] The protocatechuic acid-modified acrylate has a structure shown in the following formula (I):

[0009]

[0010] Wherein, R is independently selected from a hydrogen atom or an alkyl group having 1 to 8 carbon atoms;

[0011] The modified cerium-iron composite oxide is obtained by modifying the cerium-iron composite oxide with a silane coupling agent.

[0012] The chloroprene rubber of the invention is a chloroprene rubber used in a hydraulic hose. The chloroprene rubber has good high temperature resistance and mechanical properties while meeting the basic properties of conventional chloroprene rubber.

[0013] in:

[0014] Chloroprene rubber is the basic raw material of this high temperature resistant chloroprene rubber.

[0015] Protocatechuic acid-modified acrylate can introduce a highly rigid benzene ring structure and multiple acrylate functional groups into the molecular structure of chloroprene rubber, and can form a dense three-dimensional cured network under curing conditions, which is beneficial to increase the cross-linking density and thus enhance the high temperature resistance.

[0016] The modified cerium-iron composite oxide is prepared by modifying nano-cerium-iron composite oxide with a silane coupling agent, wherein Ce is a rare earth metal element and Fe is a transition metal element. The composite oxide formed by the composite of the two, i.e., ion doping and composite, has a higher oxygen storage capacity than single-component cerium oxide. The composite oxide is modified with a silane coupling agent so that, during use, on the one hand, the poor compatibility between inorganic and organic substances can be improved, and on the other hand, the composite oxide can play a role of heterogeneous nucleation, and can induce effective crystallization of chloroprene rubber materials, so that the molecular structure is arranged in an orderly manner, thereby further increasing the high temperature resistance of chloroprene rubber.

[0017] Protocatechuic acid-modified acrylate and modified ferrocerium composite oxide work together. Ferrocerium composite oxide has good oxygen storage capacity and good high temperature resistance. However, it is an inorganic substance and has poor compatibility with organic matter. Although the modification of ferrocerium composite oxide can increase its compatibility with other substances to a certain extent, there is still a problem of poor compatibility. In the protocatechuic acid-modified acrylate, there is a π electron conjugated structure, which can form an intermolecular force with the modified ferrocerium composite oxide, thereby ensuring that the protocatechuic acid-modified acrylate can be evenly distributed in the chloroprene rubber with the modified ferrocerium composite oxide. In addition, the protocatechuic acid-modified acrylate has multiple acrylate functional groups. On the one hand, it can react with the matrix chloroprene rubber to form a dense three-dimensional network structure, increase the crosslinking density, and improve the high temperature resistance. On the other hand, it can increase the contact area with the modified ferrocerium composite oxide, further increase the dispersibility and stability of the ferrocerium composite oxide in the matrix material, so that the matrix material has a good crystallinity, and the high temperature resistance and mechanical properties of the chloroprene rubber will be further improved.

[0018] In the chloroprene rubber vulcanization system, alkali metal zinc oxide and magnesium oxide are usually added for vulcanization, in which zinc oxide plays a vulcanizing role and magnesium oxide plays an acid absorber role; in order to increase the degree of reaction as much as possible, a vulcanization accelerator is usually added during the vulcanization reaction.

[0019] In the present invention, high temperature resistance means that the chloroprene rubber has a tensile strength of more than 33 MPa and a tensile strength retention rate of more than 90% after heat treatment.

[0020] In the present invention, the preparation method of the modified cerium-iron composite oxide comprises: dispersing a silane coupling agent in a mixed solution of alcohol and water, then adding nano-cerium-iron composite oxide, heat-insulating ball milling, and drying to obtain the modified cerium-iron composite oxide.

[0021] Optionally, the alcohol is ethanol or isopropanol.

[0022] Optionally, based on 1 mL of the mixed solution of alcohol and water, the amount of the silane coupling agent added is 0.3-0.8 g, for example, 0.3 g, 0.4 g, 0.5 g, 0.6 g, 0.7 g, 0.8 g, etc.

[0023] Optionally, in the mixed solution, the volume ratio of alcohol to water is (0.2-0.5):1, for example, 0.2:1, 0.3:1, 0.4:1, 0.5:1, etc.

[0024] Optionally, the ball milling temperature is 40-60°C, such as 40°C, 45°C, 50°C, 55°C, 60°C, etc.

[0025] Optionally, in formula (I), R is methyl, and the protocatechuic acid-modified acrylate has the following structure:

[0026]

[0027] Optionally, the weight ratio of the protocatechuic acid-modified acrylate and the modified cerium-iron composite oxide is (1.5-2):1, for example, 1.5:1, 1.6:1, 1.7:1, 1.8:1, 1.9:1, 2:1, etc.; when the addition amount of the two is within this range, the obtained chloroprene rubber has good high temperature resistance and mechanical properties; if the addition amount of the two is not within this range, its high temperature resistance and mechanical properties will be reduced.

[0028] Optionally, the vulcanization accelerator is a combination of accelerator DTDM and accelerator NA22.

[0029] Optionally, the mass ratio of the accelerator DTDM to the accelerator NA22 is (0.5-2):1, for example, 0.5:1, 0.8:1, 1:1, 1.2:1, 1.5:1, 1.8:1, 2:1, etc.

[0030] Optionally, the high temperature resistant chloroprene rubber further comprises 1-3 parts of functional additives.

[0031] Optionally, the functional additive includes any one of a flame retardant, a light stabilizer or an anti-aging agent, or a combination of at least two of them.

[0032] A second object of the present invention is to provide a method for preparing the high temperature resistant chloroprene rubber as described in the first object, the preparation method comprising:

[0033] (1) mixing chloroprene rubber, a vulcanization accelerator, magnesium oxide, zinc oxide, protocatechuic acid-modified acrylate, and an optional functional additive in an open mill to obtain a first mixture;

[0034] (2) adding modified cerium-iron composite oxide to the first mixture obtained in step (1), kneading, and vulcanizing to obtain high temperature resistant chloroprene rubber.

[0035] Optionally, the mixing temperature in step (1) is 120-140° C., for example, 120° C., 125° C., 130° C., 135° C., 140° C., etc., and the mixing time is 15-25 min, for example, 15 min, 18 min, 20 min, 22 min, 25 min, etc.;

[0036] Optionally, the mixing temperature in step (2) is 120-140° C., for example, 120° C., 125° C., 130° C., 135° C., 140° C., etc., and the mixing time is 10-20 min, for example, 10 min, 12 min, 15 min, 18 min, 20 min, etc.;

[0037] Optionally, the vulcanization temperature in step (2) is 160-190°C, for example, 160°C, 165°C, 170°C, 175°C, 180°C, 185°C, 190°C, etc.

[0038] A third object of the present invention is to provide an application of the high temperature resistant chloroprene rubber as described in the first object in a hydraulic hose.

[0039] Compared with the prior art, the present invention has at least the following beneficial effects:

[0040] The chloroprene rubber in the present invention has good high temperature resistance and mechanical properties, mainly because in the process of preparing the chloroprene rubber, the acrylate modified by protocatechuic acid and the modified ferrocerium composite oxide are added to act together. Firstly, the modified ferrocerium composite oxide has good oxygen storage capacity and good high temperature resistance. Secondly, based on the existence of the π electron conjugated structure in the acrylate modified by protocatechuic acid, it can form an intermolecular force with the modified ferrocerium composite oxide, thereby ensuring that the acrylate modified by protocatechuic acid can be uniformly distributed in the chloroprene rubber with the modified ferrocerium composite oxide. In addition, the acrylate modified by protocatechuic acid has multiple acrylate functional groups, which can react with the matrix chloroprene rubber to form a dense three-dimensional network structure, and under the action of the modified ferrocerium composite oxide, the matrix material has good crystallinity, thereby further improving the high temperature resistance and mechanical properties of the chloroprene rubber. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a scanning electron microscope image of the high temperature resistant additive prepared in Example 1 of the present invention;

[0042] Figure 2 It is the tensile strength retention rate of the chloroprene rubber obtained in Examples 1-7 of the present invention and Comparative Examples 1-8. DETAILED DESCRIPTION

[0043] The technical solution of the present invention is described in detail below in conjunction with specific embodiments and their accompanying drawings. The embodiments recorded herein are specific embodiments of the present invention, which are used to illustrate the concept of the present invention; these descriptions are explanatory and exemplary and should not be construed as limitations on the embodiments of the present invention and the scope of protection of the present invention. In addition to the embodiments recorded herein, those skilled in the art can also adopt other obvious technical solutions based on the contents disclosed in the claims of this application and its specification, including technical solutions that adopt any obvious replacements and modifications to the embodiments recorded herein.

[0044] The brands, manufacturers and other information of the main chemical reagents used in the embodiments of the present invention and the comparative examples are as follows: chloroprene rubber, brand 2321, Chongqing Changshou Chemical Co., Ltd.; accelerator DTDM, Shandong Star Chemical Technology Co., Ltd.; accelerator NA22, Zhejiang Huangyan Zhedong Rubber Additive Co., Ltd.; magnesium oxide and zinc oxide, Rhein Chemie (Qingdao) Co., Ltd.; silane coupling agent KH-580, Nanjing Pinning Coupling Agent Co., Ltd.; ferric nitrate, Hubei Chengfeng Chemical Co., Ltd.; cerium nitrate, Shanghai Jingchun Biochemical Technology Co., Ltd.; sodium hydroxide, Fuchen (Tianjin) Chemical Reagent Co., Ltd.; ethanol, Laird Electronic Materials Co., Ltd.; protocatechuic acid and sodium dihydrogen phosphate, Vikki Biological Co., Ltd.; epichlorohydrin, methyl isobutyl ketone, tetraethylammonium bromide, Shanghai Aladdin Biochemical Technology Co., Ltd.; p-Hydroxyanisole, Jiangsu Taihu New Materials Holding Yancheng Co., Ltd.; methacrylic acid, Jinan Century Tongda Chemical Co., Ltd.

[0045] Preparation Example 1

[0046] This preparation example provides a method for preparing a modified cerium-iron composite oxide, comprising:

[0047] (1) dissolving cerium nitrate and iron nitrate in a molar ratio of 1.5:1 in water to form a mixed salt solution, then adding a sodium hydroxide solution, stirring and precipitating, centrifuging, drying at 120° C., and calcining at 400° C. for 2 h to obtain a cerium-iron composite oxide;

[0048] (2) 4 g of a silane coupling agent was dispersed in 8 mL of a mixed solvent of ethanol and water in a volume ratio of 0.4:1 to obtain a mixed solution, and then 100 g of cerium-iron composite oxide was added, the mixture was ball-milled at 50° C., and dried to obtain a modified cerium-iron composite oxide.

[0049] Figure 1 This is a scanning electron microscope image of the product prepared in this preparation example. It can be seen from the image that the size is nanometer-level, which makes it have good dispersibility.

[0050] Preparation Example 2

[0051] This preparation example provides a method for preparing protocatechuic acid-modified acrylate, comprising:

[0052] (1) uniformly mixing protocatechuic acid, epichlorohydrin and methyl isobutyl ketone in a mass ratio of 100:220:50 to obtain a mixture;

[0053] (2) The mixture was heated to 45°C, and a 45% sodium hydroxide solution was added dropwise at normal pressure for 6 times, and the mixture was reacted for 6 hours to obtain a mixed solution in which the molar ratio of protocatechuic acid to sodium hydroxide was 1:3.02;

[0054] (3) treating the mixed solution with sodium dihydrogen phosphate to remove the alkali therein, and removing the salt generated by the reaction by washing with water;

[0055] (4) introducing nitrogen gas at a flow rate of 1 mL / min at a temperature of 130° C. and a vacuum degree of −85 kPa to perform nitrogen stripping treatment to obtain an intermediate;

[0056] (5) The temperature was lowered to 80° C., 2.1 g of tetraethylammonium bromide and 0.35 g of p-hydroxyanisole were added to the intermediate and mixed evenly. Within a dropwise addition time of 1.5 h, 172 g of methacrylic acid was slowly added. The reaction temperature was 100° C. and the reaction was carried out for 4 h until the pH was lower than 5 to obtain protocatechuic acid-modified acrylate.

[0057] Example 1

[0058] This embodiment provides a high temperature resistant chloroprene rubber, the raw material composition of which is as follows:

[0059] 100 parts of chloroprene rubber, 2 parts of vulcanization accelerator, 5 parts of magnesium oxide, 5 parts of zinc oxide, 5 parts of protocatechuic acid-modified acrylate, and 3 parts of modified cerium-iron composite oxide;

[0060] The vulcanization accelerator is a combination of accelerator DTDM and accelerator NA22 in a mass ratio of 1:1; the protocatechuic acid-modified acrylate and the modified cerium-iron composite oxide are obtained through Preparation Example 1-2.

[0061] This embodiment also provides a method for preparing high-temperature chloroprene rubber, comprising:

[0062] (1) mixing chloroprene rubber, vulcanization accelerator, magnesium oxide, zinc oxide and protocatechuic acid-modified acrylate in an open mill at 130° C. for 17 min;

[0063] (2) Adding the modified cerium-iron composite oxide to the mixture of step (1), continuing to mix for 13 minutes, and vulcanizing on a plate at 175° C. to obtain the high temperature resistant chloroprene rubber.

[0064] Example 2

[0065] This embodiment provides a high temperature resistant chloroprene rubber, the raw material composition of which is as follows:

[0066] 100 parts of chloroprene rubber, 1 part of vulcanization accelerator, 3 parts of magnesium oxide, 3 parts of zinc oxide, 3 parts of protocatechuic acid-modified acrylate, and 2 parts of modified cerium-iron composite oxide;

[0067] The vulcanization accelerator is a combination of accelerator DTDM and accelerator NA22 in a mass ratio of 2:1; the protocatechuic acid-modified acrylate and the modified cerium-iron composite oxide are obtained through Preparation Example 1-2.

[0068] This embodiment also provides a method for preparing high-temperature chloroprene rubber, comprising:

[0069] (1) mixing chloroprene rubber, a vulcanization accelerator, magnesium oxide, zinc oxide and protocatechuic acid-modified acrylate in an open mill at 120° C. for 20 min;

[0070] (2) Adding the modified cerium-iron composite oxide to the mixture of step (1), continuing to mix for 10 minutes, and vulcanizing on a plate at 160° C. to obtain the high temperature resistant chloroprene rubber.

[0071] Example 3

[0072] This embodiment provides a high temperature resistant chloroprene rubber, the raw material composition of which is as follows:

[0073] 100 parts of chloroprene rubber, 5 parts of vulcanization accelerator, 6 parts of magnesium oxide, 6 parts of zinc oxide, 10 parts of protocatechuic acid-modified acrylate and 5 parts of modified cerium-iron composite oxide;

[0074] The vulcanization accelerator is a combination of accelerator DTDM and accelerator NA22 in a mass ratio of 0.5:1; the protocatechuic acid-modified acrylate and the modified cerium-iron composite oxide are obtained through Preparation Example 1-2.

[0075] This embodiment also provides a method for preparing high-temperature chloroprene rubber, comprising:

[0076] (1) mixing chloroprene rubber, a vulcanization accelerator, magnesium oxide, zinc oxide and protocatechuic acid-modified acrylate in an open mill at 140° C. for 15 min;

[0077] (2) Adding the modified cerium-iron composite oxide to the mixture of step (1), continuing to mix for 20 minutes, and vulcanizing on a plate at 190° C. to obtain the high temperature resistant chloroprene rubber.

[0078] Example 4

[0079] The difference from Example 1 is that 5 parts of protocatechuic acid-modified acrylate and 5 parts of modified cerium-iron composite oxide are added, that is, the weight ratio of the two is 1:1.

[0080] Example 5

[0081] The difference from Example 1 is that 3 parts of protocatechuic acid-modified acrylate and 1 part of modified cerium-iron composite oxide are added, that is, the weight ratio of the two is 3:1.

[0082] Example 6

[0083] The only difference from Example 1 is that the combination of accelerator DTDM and accelerator NA22 in Example 1 is replaced by a single accelerator DTDM of equal mass.

[0084] Example 7

[0085] The only difference from Example 1 is that the combination of accelerator DTDM and accelerator NA22 in Example 1 is replaced by a single accelerator NA22 of equal mass.

[0086] Comparative Example 1

[0087] The only difference from Example 1 is that the modified ferrocerium composite oxide is replaced by ferrocerium composite oxide of the same mass.

[0088] Comparative Example 2

[0089] The only difference from Example 1 is that the modified cerium-iron composite oxide is replaced by modified cerium oxide of the same mass, and the modification method is the same as that of the modified cerium-iron composite oxide.

[0090] Comparative Example 3

[0091] The only difference from Example 1 is that the modified cerium-iron composite oxide is replaced by modified iron oxide of the same mass, and the modification method is the same as that of the modified cerium-iron composite oxide.

[0092] Comparative Example 4

[0093] The only difference from Example 1 is that the modified cerium-iron composite oxide is replaced by unmodified iron oxide of the same mass, and the modification method is the same as that of the modified cerium-iron composite oxide.

[0094] Comparative Example 5

[0095] The only difference from Example 1 is that the modified cerium-iron composite oxide is replaced by a combination of cerium oxide and iron oxide of equal mass (the molar ratio of cerium oxide to iron oxide is 1.5:1).

[0096] Comparative Example 6

[0097] The only difference from Example 1 is that the protocatechuic acid-modified acrylate is replaced by acrylate of equal mass.

[0098] Comparative Example 7

[0099] The only difference from Example 1 is that the protocatechuic acid-modified acrylate is not included, and the added amount of the modified ferrocerium composite oxide is the sum of the added amounts of the protocatechuic acid-modified acrylate and the modified ferrocerium composite oxide in Example 1.

[0100] Comparative Example 8

[0101] The only difference from Example 1 is that the modified ferrocerium composite oxide is not included, and the amount of protocatechuic acid-modified acrylate added is the sum of the amounts of protocatechuic acid-modified acrylate and modified ferrocerium composite oxide added in Example 1.

[0102] Test Method

[0103] The high temperature resistant chloroprene rubber obtained in Examples 1-7 and Comparative Examples 1-8 was subjected to high temperature heat aging treatment, the treatment conditions were 130°C, and the heat aging treatment was 720 hours. The tensile strength of the fresh high temperature resistant chloroprene rubber and the chloroprene rubber after heat aging treatment were tested respectively. The tensile strength test method was based on GB / T528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber". The test results are shown in Table 1:

[0104] Table 1 Performance test results of high temperature resistant chloroprene rubber obtained in Examples 1-7 and Comparative Examples 1-8

[0105]

[0106]

[0107] It can be seen from the test results of Examples 1-3 that, by adopting the technical solution provided by the present application, the chloroprene rubber has good high temperature resistance, and has a good retention rate of tensile strength after high temperature treatment; by comparing Example 1 with Examples 4-5, it can be seen that when the modified ferrocerium composite oxide and the modified acrylate are within the preferred addition range of the present application, the chloroprene rubber has better high temperature resistance and tensile strength retention rate; by comparing Example 1 with Examples 6-7, it can be seen that when the accelerator adopts a combination of accelerator DTDM and accelerator NA22, the chloroprene rubber has good high temperature resistance; From the comparison between Example 1 and Comparative Examples 1-5, it can be seen that when a specific modified ferrocerium composite oxide is used, the obtained chloroprene rubber has better high temperature resistance and better tensile strength retention rate; from the comparison between Example 1 and Comparative Example 6, it can be seen that when a specific modified acrylate is used, the obtained chloroprene rubber has better high temperature resistance and better tensile strength retention rate; from the comparison between Example 1 and Comparative Examples 7-8, it can be seen that the modified ferrocerium composite oxide and the modified acrylate need to work together to have better high temperature resistance. If one of them is missing, this effect cannot be achieved.

[0108] Figure 2 The tensile strength retention rates of the chloroprene rubbers obtained in Examples 1-7 and Comparative Examples 1-8 after heat treatment clearly show that the adoption of the technical solution of the present application can significantly improve the high temperature resistance and mechanical properties of the chloroprene rubbers.

[0109] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A high temperature resistant chloroprene rubber, characterized in that: The raw material components of the high temperature resistant chloroprene rubber include 100 parts of chloroprene rubber, 1-5 parts of vulcanization accelerator, 3-6 parts of magnesium oxide, 3-6 parts of zinc oxide, 1-10 parts of protocatechuic acid modified acrylate and 0.5-5 parts of modified cerium iron composite oxide; The protocatechuic acid-modified acrylate has a structure shown in the following formula (I): Wherein, R is independently selected from a hydrogen atom or an alkyl group having 1 to 8 carbon atoms; The modified cerium-iron composite oxide is obtained by modifying nano-cerium-iron composite oxide with a silane coupling agent.

2. The high temperature resistant chloroprene rubber according to claim 1, characterized in that: The preparation method of the modified cerium-iron composite oxide comprises: dispersing a silane coupling agent in a mixed solution of alcohol and water, then adding the cerium-iron composite oxide, heat-insulating ball milling, and drying to obtain the modified cerium-iron composite oxide.

3. The high temperature resistant chloroprene rubber according to claim 2, characterized in that: The alcohol is ethanol or isopropanol; Based on the addition amount of the mixed solution of alcohol and water being 1 mL, the addition amount of the silane coupling agent is 0.3-0.8 g; In the mixed solution, the volume ratio of alcohol to water is (0.2-0.5):1; The molar ratio of cerium to iron in the cerium-iron composite oxide is (1-2):1; The temperature of the ball milling is 40-60°C.

4. The high temperature resistant chloroprene rubber according to claim 1, characterized in that: The R is a methyl group, and the protocatechuic acid-modified acrylate has the following structure:

5. The high temperature resistant chloroprene rubber according to claim 1, characterized in that: The weight ratio of the protocatechuic acid-modified acrylate to the modified cerium-iron composite oxide is (1.5-2):

1.

6. The high temperature resistant chloroprene rubber according to claim 1, characterized in that: The vulcanization accelerator is a combination of accelerator DTDM and accelerator NA22; The mass ratio of the accelerator DTDM to the accelerator NA22 is (0.5-2):

1.

7. The high temperature resistant chloroprene rubber according to claim 1, characterized in that: The high temperature resistant chloroprene rubber also includes 1-3 parts of functional additives; The functional auxiliary agent includes any one of a flame retardant, an anti-cold agent or an anti-aging agent, or a combination of at least two of them.

8. The method for preparing the high temperature resistant chloroprene rubber according to any one of claims 1 to 7, characterized in that: The preparation method comprises: (1) mixing chloroprene rubber, a vulcanization accelerator, magnesium oxide, zinc oxide, and protocatechuic acid-modified acrylate in an open mill to obtain a first mixture; (2) adding modified cerium-iron composite oxide to the first mixture obtained in step (1), kneading, and vulcanizing to obtain high temperature resistant chloroprene rubber.

9. The preparation method according to claim 8, characterized in that: The mixing temperature in step (1) is 120-140° C. and the mixing time is 15-25 min. The mixing temperature in step (2) is 120-140° C. and the mixing time is 10-20 min. The vulcanization temperature in step (2) is 160-190°C.

10. Use of the high temperature resistant chloroprene rubber according to any one of claims 1 to 7 in hydraulic hoses.

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