Adhesive silicone rubber for fluoroplastic, preparation method of adhesive silicone rubber and rubber tube

Abstract

The invention relates to the technical field of hose materials, and particularly discloses adhesive silicone rubber for fluoroplastic, a preparation method of the adhesive silicone rubber and a rubber hose. The adhesive silicone rubber for fluoroplastics is prepared from the following raw materials in parts by weight: 95-105 parts of silicone rubber; 2-5 parts of a rubber auxiliary agent; 0.5 to 1.2 parts of vulcanizing agent; the rubber additive is a raw material which has ionic bonds and double bonds and can be subjected to covalent cross-linking, ionic cross-linking and physical entanglement with the silicone rubber; the preparation method comprises the following steps: putting the silicone rubber, the rubber additive and the vulcanizing agent into a kneading machine, internally mixing and uniformly mixing, then removing the internally mixed mixture, rolling on an open mill, and obtaining the adhesive type silicone rubber for the fluoroplastic after the open milling is completed. The adhesive silicone rubber for the fluoroplastic can also be directly bonded and combined with the fluoroplastic subjected to sodium naphthalene etching, and excellent bonding stability can be shown after bonding and combination.

Description

Technical Field

[0001] The present application relates to the technical field of hose materials, and more specifically, to a bonding silicone rubber for fluoroplastics, a preparation method thereof, and a hose. Background Art

[0002] In the medical or pharmaceutical industry, liquid medicine needs to be transported, and rubber hoses are usually required to connect equipment. The requirements for the transmission tube are very high and must have medical-grade certification (the material needs to be certified by USP88 Class VI and USP86 Class VI).

[0003] Silicone is widely used in the pharmaceutical or medical industry due to its purity and excellent biocompatibility. However, silicone has certain limitations due to its poor chemical resistance. Fluoroplastic (PTFE, FEP, PFA, ETFE) has excellent chemical resistance and stability. Specifically, it is non-sticky to almost all materials, has excellent high and low temperature resistance, low surface energy, extremely low friction coefficient, wear resistance, and chemical corrosion resistance. The material can pass medical grade certification. When fluoroplastic is used as the inner layer of silicone rubber hose, the shortcomings of silicone can be overcome, but because fluoroplastic and silicone are non-stick, delamination will occur during use, resulting in product failure.

[0004] In the past, adhesives were usually used to bond fluoroplastics and silicone rubber. However, it was found in applications that if the bonding surface of fluoroplastics was not treated, a stable bonding effect could not be achieved. If the bonding surface of fluoroplastics was treated and then adhesives were used, not only many adhesives could be used, but also stable and excellent bonding effects could be achieved. In the bonding surface treatment of fluoroplastics, sodium naphthalene etching is usually used to affect the surface of fluoroplastics. Under the premise of not affecting its internal physical and chemical properties, fluoroplastics and silicone rubber can show excellent bonding strength improvement under the action of adhesives.

[0005] With respect to the above-mentioned related technologies, the inventors believe that in medical hoses, considering the influence of biocompatibility, safety, application stability, etc., it is necessary to use high-performance medical adhesives. This will lead to a significant increase in costs, increase the operating procedures and difficulty of the manufacturing process, and be subject to greater restrictions in application.

[0006] Therefore, it is urgent to propose a solution to solve the above technical problems. Summary of the invention

[0007] In order to enable silicone rubber to be directly bonded to fluoroplastics after being etched with sodium naphthalene, and the two can show excellent bonding stability after bonding, the present application provides a bonding silicone rubber for fluoroplastics, a preparation method thereof, and a hose.

[0008] In the first aspect, the present application provides a bonding silicone rubber for fluoroplastics, which adopts the following technical solution: A bonding silicone rubber for fluoroplastics, made from the following raw materials in parts by weight: Silicone rubber 95-105 parts; 2-5 parts of rubber additives; Vulcanizing agent 0.5-1.2 parts; The rubber additive is a raw material having ionic bonds and double bonds and capable of covalently crosslinking, ionic crosslinking and physically entangled with silicone rubber.

[0009] By adopting the above technical scheme, the covalent crosslinking effect brought by the rubber additive can connect two or more molecules together through chemical bonds, thereby enhancing the stability and mechanical strength of the molecules; the ionic crosslinking effect brought by the rubber additive can significantly improve the stability and mechanical properties, which is mainly achieved through the electrostatic attraction, coordination bonds or hydrogen bonds between positive ions and negative ions; the physical entanglement effect brought by the rubber additive is mainly achieved through the "trap" of the network chain between the crosslinking points after the polymer chains entangled with each other form a chemical crosslinking network, thereby generating additional crosslinking effects, thereby increasing the density of the polymer chain and the interaction between the molecular chains; and the orderly combination of covalent crosslinking, ionic crosslinking and physical entanglement brought by the rubber additive through its application can form a stable three-dimensional crosslinking structure in the silicone rubber, and can then be firmly attached to the surface of the substrate, showing better adhesion improvement, and the final adhesive silicone rubber for fluoroplastics can also be directly bonded to the fluoroplastics after naphthalene sodium etching, and can show excellent bonding stability after bonding.

[0010] Preferably, the rubber additive is composed of the following raw materials in parts by weight: Zinc methacrylate ZDMA 5-8 parts 3-5 parts of acrylic acid zinc-based crosslinking agent SZDA; 0.5-1 part of dicumyl peroxide; 1.5-2.5 parts of dibenzothiazyl disulfide.

[0011] By adopting the above technical scheme, zinc methacrylate ZDMA mainly includes two mechanisms of ionic crosslinking and covalent crosslinking, which can not only make the polymer particles mutually connected through ionic bonds to form an ionic crosslinking network, but also make the rubber molecular chains undergo crosslinking reactions to form a covalent crosslinking network; the zinc acrylate-based crosslinking agent SZDA is a typical ionic crosslinking agent, diisopropylbenzene peroxide is introduced as a covalent crosslinking, and then the crosslinking regulating and promoting effect brought by dibenzothiazole disulfide is utilized, and under the premise of using zinc methacrylate ZDMA as the background, it can exert excellent covalent crosslinking, ionic crosslinking and physical entanglement effects with silicone rubber, thereby making the adhesive silicone rubber for fluoroplastics and the fluoroplastics etched with sodium naphthalene show excellent bonding stability.

[0012] Preferably, the weight ratio of the zinc methacrylate ZDMA, the zinc acrylate-based crosslinking agent, dicumyl peroxide and dibenzothiazole disulfide is 6:4:0.7:2.

[0013] By adopting the above technical scheme, when the zinc methacrylate ZDMA, zinc acrylate-based crosslinking agent, diisopropylbenzene peroxide and dibenzothiazole disulfide in the above weight ratio are used in combination, the four have better coordination with each other in the silicone rubber system, so that the overall effect of the application of rubber additives is better, and the quality of the obtained adhesive silicone rubber for fluoroplastics is also better.

[0014] Preferably, the raw material of the adhesive silicone rubber for fluoroplastics further contains 3-7 parts by weight of a functional additive, the functional additive is composed of modified fumed silica and 2,2,2-trifluoroethyl methacrylate, and the weight ratio of the modified fumed silica to 2,2,2-trifluoroethyl methacrylate is (4-6):1; The modified fumed silica is prepared by the following method: S1, after mixing devinyl triethoxysilane with water and anhydrous ethanol, hydrolyze at 35-45°C for 15-25min to obtain a modified liquid; S2, atomizing the modified liquid obtained in step S1 and mixing it with the fumed silica raw material, heating the paper at 100-110° C. for modification for 2-3 hours to obtain modified fumed silica.

[0015] By adopting the above technical scheme, fumed silica can form a network structure through the action of hydrogen bonds and van der Waals forces, and can produce a strong interaction with the silicone rubber molecular chain; and the fumed silica is modified to graft vinyl triethoxysilane on its surface, and then by having a branched structure, the overall interface bonding ability of the silicone rubber is further improved, and it can form a stable bond with the fluoroplastic etched by sodium naphthalene. The use of 2,2,2-trifluoroethyl methacrylate can have a two-phase compatibilization effect in the process of combining silicone rubber with fluoroplastics etched by sodium naphthalene, thereby enhancing the interface bonding between silicone rubber and fluoroplastics etched by sodium naphthalene. When the functional additive composed of modified fumed silica and 2,2,2-trifluoroethyl methacrylate is applied to the preparation of adhesive silicone rubber for fluoroplastics, the two can play an excellent compounding synergistic role with each other, and can combine at the interface of silicone rubber and fluoroplastics etched by sodium naphthalene to build a more stable bonding structure, and the bonding stability shown can also be significantly improved.

[0016] Preferably, the weight ratio of the modified fumed silica to 2,2,2-trifluoroethyl methacrylate is 5:1.

[0017] By adopting the above technical scheme, the modified gas phase silica and 2,2,2-trifluoroethyl methacrylate in the above weight ratio have a relatively excellent coordination effect when used in combination, so that the bonding stability of the silicone rubber and the fluoroplastic etched with sodium naphthalene is better.

[0018] Preferably, the specific surface area of ​​the fumed silica raw material used in preparing the modified fumed silica is 200-220 m 2 / g.

[0019] By adopting the above technical scheme, the modified fumed silica with the above specific surface area is not only easy to disperse evenly during the application process, but also can form more bonding points in the silicone rubber system and form a more coordinated matching system with 2,2,2-trifluoroethyl methacrylate, thereby making the bonding stability improvement effect brought about by the application of functional additives more significant.

[0020] Preferably, the vulcanizing agent is one or a combination of peroxides, sulfur-containing compounds, quinone oximes, sulfur and their derivatives.

[0021] By adopting the above technical scheme, the vulcanizing agent can cause cross-linking reaction of the rubber molecular chain, transforming the linear molecular structure into a three-dimensional network structure, so that the rubber has both elasticity and strength, and the above-mentioned types of vulcanizing agents are suitable for the preparation of adhesive silicone rubber for fluoroplastics, and can obtain adhesive silicone rubber for fluoroplastics with excellent and stable quality.

[0022] In the second aspect, the present application provides a method for preparing adhesive silicone rubber for fluoroplastics, using the following technical solution: A method for preparing adhesive silicone rubber for fluoroplastics comprises the following steps: (1) Prepare raw materials including silicone rubber, rubber additives and vulcanizing agent according to the proportion; (2) Mixing: Add the silicone rubber, rubber additives and vulcanizing agent prepared in step (1) into a kneader and mix them evenly; (3) Open mixing: the mixed material after the internal mixing in step (2) is removed and rolled on an open mixing mill. After the open mixing is completed, the adhesive silicone rubber for fluoroplastics is obtained.

[0023] By adopting the above technical scheme, the above preparation method is simple to operate, and each raw material is added and used in steps during the process, which is not only easy to control the quality during the process, but also enables each component raw material to fully play its role, thereby obtaining an excellent and stable adhesive silicone rubber for fluoroplastics, which can also be suitable for large-scale industrial production.

[0024] In a third aspect, the present application provides a hose, which adopts the following technical solution: A rubber hose comprises a built-in fluoroplastic tube sleeve and an externally applied silicone rubber layer, wherein the fluoroplastic tube sleeve is fluoroplastic etched with a sodium naphthalene solution, and the silicone rubber layer is the adhesive silicone rubber for the fluoroplastic obtained above.

[0025] By adopting the above technical scheme, the fluoroplastic etched with sodium naphthalene solution is used as the fluoroplastic tube sleeve, and a silicone rubber layer is applied on the outside to form a rubber tube. This can not only overcome the shortcomings of silicone, but also show excellent bonding stability, thereby avoiding the use of high-performance medical adhesives, which is beneficial to reducing costs, and significantly reducing the operating procedures and difficulty of the manufacturing process, and the overall applicability is greatly improved.

[0026] Preferably, the fluoroplastic is any one of PTFE, FEP, PFA and ETFE.

[0027] By adopting the above technical scheme, the above types of fluoroplastics can form relatively excellent and stable interface bonding with the adhesive silicone rubber for fluoroplastics after being etched with sodium naphthalene solution, thereby obtaining a hose with better quality.

[0028] In summary, this application has the following beneficial effects: 1. The present application utilizes the orderly combination of covalent crosslinking, ionic crosslinking and physical entanglement brought by rubber additives to form a stable three-dimensional crosslinking structure in silicone rubber, thereby bringing about a better adhesion improvement effect. The finally obtained adhesive silicone rubber for fluoroplastics can also be directly bonded to the fluoroplastics etched with sodium naphthalene, and can show excellent bonding stability after bonding; among them, the corresponding effect brought by zinc methacrylate ZDMA, zinc acrylate-based crosslinking agent SZDA, diisopropylbenzene peroxide and dibenzothiazole disulfide as rubber additives is better; 2. The present application modifies fumed silica, and uses the obtained modified fumed silica and 2,2,2-trifluoroethyl methacrylate to form a functional additive for use in adhesive silicone rubber for fluoroplastics. This can form a more stable bonding structure at the interface between silicone rubber and fluoroplastics etched with sodium naphthalene, thereby significantly improving the bonding stability of the silicone rubber and fluoroplastics etched with sodium naphthalene. DETAILED DESCRIPTION

[0029] The present application is further described in detail below in combination with preparation examples, embodiments and comparative examples.

[0030] Unless otherwise specified, the raw materials used in the preparation examples, embodiments and comparative examples of the present application are commercially available.

[0031] Preparation examples of raw materials and / or intermediates Preparation Example 1, A modified fumed silica is prepared by the following method: S1, devinyl triethoxysilane, water and anhydrous ethanol were mixed and hydrolyzed at 40°C for 20 minutes to obtain a modified solution; S2, atomizing the modified liquid obtained in step S1 and mixing it with the fumed silica raw material, heating the paper at 105° C. for modification for 2.5 hours to obtain modified fumed silica.

[0032] Note: In the above operation, the weight ratio of vinyl triethoxysilane to water and anhydrous ethanol is 8:72:20; the weight ratio of vinyl triethoxysilane to fumed silica raw material is 1.5:100. The specific surface area of ​​fumed silica raw material is 210m 2 / g.

[0033] Preparation Example 2 A modified fumed silica, which is different from Preparation Example 1 in that it is prepared by the following method: S1, devinyl triethoxysilane, water and anhydrous ethanol were mixed and hydrolyzed at 35°C for 25 minutes to obtain a modified solution; S2, atomizing the modified liquid obtained in step S1 and mixing it with the fumed silica raw material, heating the paper at 100° C. for modification for 3 hours to obtain modified fumed silica.

[0034] Preparation Example 3 A modified fumed silica, which is different from Preparation Example 1 in that it is prepared by the following method: S1, devinyl triethoxysilane, water and anhydrous ethanol were mixed, and hydrolyzed at 45°C for 15 minutes to obtain a modified solution; S2, atomizing the modified liquid obtained in step S1 and mixing it with the fumed silica raw material, heating the paper at 110° C. for modification for 2 hours to obtain modified fumed silica.

[0035] Preparation Example 4 A modified fumed silica, which is different from Preparation Example 1 in that the specific surface area of ​​the fumed silica raw material is 200 m 2 / g.

[0036] Preparation Example 5 A modified fumed silica, which is different from Preparation Example 1 in that the specific surface area of ​​the fumed silica raw material is 220 m 2 / g.

[0037] Example 1 A bonding silicone rubber for fluoroplastics, the raw materials used for preparation and their corresponding weights are shown in Table 1, and the silicone rubber is prepared by the following steps: (1) Prepare raw materials including silicone rubber, rubber additives and vulcanizing agent according to the proportion; (2) Mixing: Add the silicone rubber, rubber additive and vulcanizing agent prepared in step (1) into a kneader at a speed of 35 r / min and mix for 20 min until the mixture is evenly mixed. (3) Open mixing: the mixed material after the internal mixing in step (2) is removed and rolled on an open mixing mill at a speed of 35 r / min for 15 times. After the open mixing is completed, the adhesive silicone rubber for fluoroplastics is obtained.

[0038] Note: The vulcanizing agent is DBPH-50; the rubber additive is a raw material with ionic bonds and double bonds, and can be covalently crosslinked, ionically crosslinked and physically entangled with silicone rubber. The raw material composition and its corresponding weight are shown in Table 2.

[0039] Example 2-3 A bonding silicone rubber for fluoroplastics, which is different from Example 1 in that the raw materials used in the preparation and their corresponding weights are shown in Table 1.

[0040] Table 1 Raw materials used in the preparation of Examples 1-3 and their weight portions (kg / portion) raw material Example 1 Example 2 Example 3 Silicone Rubber 100 95 105 Rubber additives 3.5 2 5 Vulcanizing agent 0.85 0.5 1.2

[0041] Embodiment 4-5 A bonding silicone rubber for fluoroplastics, which is different from Example 1 in that the raw material composition of the rubber additive and its corresponding weight are shown in Table 2.

[0042] Table 1 Composition of rubber additive raw materials in Examples 1, 4-5 and their weight parts (kg / part) raw material Example 1 Example 4 Example 5 Zinc Methacrylate ZDMA 6.5 5 8 Zinc acrylate crosslinker SZDA 4 3 5 Dicumyl peroxide 0.75 0.5 1 Dibenzothiazyl disulfide 2 1.5 2.5

[0043] Example 6 A bonding silicone rubber for fluoroplastics, which is different from Example 1 in that the total amount of zinc methacrylate ZDMA, zinc acrylate-based crosslinking agent, diisopropylbenzene peroxide and dibenzothiazole disulfide remains unchanged, and the weight ratio of the four is adjusted to 6:4:0.7:2.

[0044] Example 7 A bonding silicone rubber for fluoroplastics, which is different from Example 1 in that the rubber additive is zinc methacrylate ZDMA.

[0045] Example 8 A bonding silicone rubber for fluoroplastics, which is different from Example 1 in that zinc methacrylate ZDMA is not used in the rubber additive.

[0046] Example 9 A bonding silicone rubber for fluoroplastics, which is different from Example 1 in that 5 parts by weight of a functional additive are also added to the raw materials, and the functional additive is composed of modified fumed silica and 2,2,2-trifluoroethyl methacrylate in a weight ratio of 5:1, and the modified fumed silica is obtained in Preparation Example 1.

[0047] Example 10 A bonding silicone rubber for fluoroplastics, which is different from Example 9 in that the weight parts of the functional additive added are 3 parts.

[0048] Embodiment 11 A bonding silicone rubber for fluoroplastics, which is different from Example 9 in that the weight parts of the functional additive added is 7 parts.

[0049] Example 12 A bonding silicone rubber for fluoroplastics, which is different from Example 9 in that the functional additive is composed of modified fumed silica and 2,2,2-trifluoroethyl methacrylate in a weight ratio of 4:1.

[0050] Example 13 A bonding silicone rubber for fluoroplastics, which is different from Example 9 in that the functional additive is composed of modified fumed silica and 2,2,2-trifluoroethyl methacrylate in a weight ratio of 6:1.

[0051] Embodiment 14 A bonding silicone rubber for fluoroplastics, which is different from Example 9 in that the modified fumed silica is obtained in Preparation Example 2.

[0052] Embodiment 15 A bonding silicone rubber for fluoroplastics, which is different from Example 9 in that the modified fumed silica is obtained in Preparation Example 3.

[0053] Example 16 A bonding silicone rubber for fluoroplastics, which is different from Example 9 in that the modified fumed silica is obtained in Preparation Example 4.

[0054] Embodiment 17 A bonding silicone rubber for fluoroplastics, which is different from Example 9 in that the modified fumed silica is obtained in Preparation Example 5.

[0055] Embodiment 18 A bonding silicone rubber for fluoroplastics, which is different from Example 9 in that modified fumed silica is not used in the functional additive.

[0056] Embodiment 19 A bonding silicone rubber for fluoroplastics, which is different from Example 9 in that 2,2,2-trifluoroethyl methacrylate is not used in the functional additive.

[0057] Embodiment 20 A bonding silicone rubber for fluoroplastics, which is different from Example 9 in that the modified fumed silica is replaced by fumed silica raw material.

[0058] Embodiment 21 A bonding silicone rubber for fluoroplastics, which is different from Example 9 in that 2,2,2-trifluoroethyl methacrylate is not used in the functional additive, and the modified fumed silica is replaced by fumed silica raw material.

[0059] Embodiment 22 A rubber hose comprises a built-in fluoroplastic tube sleeve and an externally applied silicone rubber layer, wherein the fluoroplastic tube sleeve is a fluoroplastic etched with a sodium naphthalene solution, and the silicone rubber layer is any one of the adhesive silicone rubbers for fluoroplastics obtained in the above embodiments, and the preparation method thereof is as follows: Put the fluoroplastic tube etched with sodium naphthalene solution on the core rod, apply the adhesive silicone rubber for fluoroplastic on the etched side, and then continue to apply the adhesive silicone rubber for fluoroplastic according to the specification requirements of the hose. After molding, wrap water cloth around the outermost side of the hose for pressurization. After wrapping, put it in a 200℃ oven for 2 hours and take it out to obtain it.

[0060] Note: Fluoroplastic is FEP.

[0061] Comparative Example 1 A bonding silicone rubber for fluoroplastics, which is different from Example 1 in that no rubber additive is used.

[0062] Performance testing Test samples: The adhesive silicone rubber for fluoroplastics obtained in Examples 1-21 and Comparative Example 1 was used and manufactured according to the hose in Example 22. The 22 hoses obtained were used as test samples 1-21 and control sample 1.

[0063] Test method: Use a peel strength tester that complies with GB / T16491-2022 to conduct adhesion test on test samples 1-21 and control sample 1, conduct adhesion test after aging at 100°C for 24 hours, and conduct adhesion test after aging at 150°C for 24 hours. Calculate the adhesion loss rate after aging at 100°C*24 hours and 50°C*24 hours, and record the test results in Table 3.

[0064] Table 3 Test results of test samples 1-21 and control sample 1

[0065] Combining Examples 1-5 and Comparative Example 1 and Table 3, it can be seen that the present application utilizes a rubber additive composed of zinc methacrylate ZDMA, zinc acrylate-based crosslinking agent SZDA, diisopropylbenzene peroxide and dibenzothiazole disulfide, which can make the obtained adhesive silicone rubber for fluoroplastics exhibit good adhesion to the fluoroplastics etched with sodium naphthalene, and after aging treatment, it can still maintain excellent bonding stability. Combining Example 6 and Table 3, it can be seen that when the weight ratio of zinc methacrylate ZDMA, zinc acrylate-based crosslinking agent, diisopropylbenzene peroxide and dibenzothiazole disulfide is 6:4:0.7:2, the overall effect of the application of the rubber additive is better, and the obtained adhesive silicone rubber for fluoroplastics has a better quality after the above test. Combined with Examples 7-8 and Table 3, it can be seen that if the rubber additive lacks zinc methacrylate ZDMA, or lacks the coordination system of zinc acrylate-based crosslinking agent SZDA, diisopropylbenzene peroxide and dibenzothiazole disulfide, the loss rate after aging obtained by the test will lead to a decrease in the bonding stability, indicating that the combination of zinc methacrylate ZDMA, zinc acrylate-based crosslinking agent, diisopropylbenzene peroxide and dibenzothiazole disulfide has a significant effect on obtaining an excellent performance adhesive silicone rubber for fluoroplastics.

[0066] Combining Example 1 and Example 9-13 with Table 3, it can be seen that the modified fumed silica and the obtained functional additive composed of 2,2,2-trifluoroethyl methacrylate are applied to the adhesive silicone rubber for fluoroplastics, which can significantly improve the bonding stability of the silicone rubber and the fluoroplastics after etching with sodium naphthalene. Combining Example 18-19 with Table 3, it can be seen that if only any one of the modified fumed silica and 2,2,2-trifluoroethyl methacrylate is used, although the bonding stability can be improved, the improvement effect is limited and far less than the excellent effect brought by the combination of the two. It can be seen that the combination of modified fumed silica and 2,2,2-trifluoroethyl methacrylate can achieve a significant improvement effect of 1+1>2 in the adhesive silicone rubber for fluoroplastics. Combined with Examples 20-21 and Table 2, it can be seen that if the modified fumed silica is replaced with fumed silica raw materials, the improvement in the bonding stability between fluoroplastics after sodium naphthalene etching of adhesive silicone rubber for fluoroplastics will be greatly reduced, and the combination of fumed silica raw materials and 2,2,2-trifluoroethyl methacrylate can only bring a simple superposition of effects, but cannot play a synergistic role in compounding.

[0067] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A bonding silicone rubber for fluoroplastics, characterized in that: Made from the following raw materials in parts by weight: Silicone rubber 95-105 parts; 2-5 parts of rubber additives; Vulcanizing agent 0.5-1.2 parts; The rubber additive is a raw material having ionic bonds and double bonds and capable of covalently crosslinking, ionic crosslinking and physically entangled with silicone rubber.

2. The adhesive silicone rubber for fluoroplastics according to claim 1, characterized in that: The rubber additive is composed of the following raw materials in parts by weight: Zinc methacrylate ZDMA 5-8 parts; 3-5 parts of acrylic acid zinc-based crosslinking agent SZDA; 0.5-1 part of dicumyl peroxide; 1.5-2.5 parts of dibenzothiazyl disulfide.

3. The adhesive silicone rubber for fluoroplastics according to claim 2, characterized in that: The weight ratio of the zinc methacrylate ZDMA, the zinc acrylate-based crosslinking agent, dicumyl peroxide and dibenzothiazole disulfide is 6:4:0.7:

2.

4. The adhesive silicone rubber for fluoroplastics according to claim 1, characterized in that: The raw material of the adhesive silicone rubber for fluoroplastics is further added with 3-7 parts by weight of a functional additive, the functional additive is composed of modified fumed silica and 2,2,2-trifluoroethyl methacrylate, and the weight ratio of the modified fumed silica to 2,2,2-trifluoroethyl methacrylate is (4-6):1; The modified fumed silica is prepared by the following method: S1, after mixing devinyl triethoxysilane with water and anhydrous ethanol, hydrolyze at 35-45°C for 15-25min to obtain a modified liquid; S2, atomizing the modified liquid obtained in step S1 and mixing it with the fumed silica raw material, heating the paper at 100-110° C. for modification for 2-3 hours to obtain modified fumed silica.

5. The adhesive silicone rubber for fluoroplastics according to claim 4, characterized in that: The weight ratio of the modified fumed silica to 2,2,2-trifluoroethyl methacrylate is 5:

1.

6. The adhesive silicone rubber for fluoroplastics according to claim 4, characterized in that: The specific surface area of ​​the fumed silica raw material used in the preparation of the modified fumed silica is 200-220 m 2 / g.

7. The adhesive silicone rubber for fluoroplastics according to claim 1, characterized in that: The vulcanizing agent is one or a combination of peroxides, sulfur-containing compounds, quinone oxime, sulfur and their derivatives.

8. The method for preparing the adhesive silicone rubber for fluoroplastics according to claim 1, characterized in that: The following steps are involved: (1) Prepare raw materials including silicone rubber, rubber additives and vulcanizing agent according to the proportion; (2) Mixing: Add the silicone rubber, rubber additives and vulcanizing agent prepared in step (1) into a kneader and mix them evenly; (3) Open mixing: the mixed material after the internal mixing in step (2) is removed and rolled on an open mixing mill. After the open mixing is completed, the adhesive silicone rubber for fluoroplastics is obtained.

9. A rubber hose, comprising a built-in fluoroplastic tube sleeve and an externally applied silicone rubber layer, characterized in that: The fluoroplastic tube sleeve is a fluoroplastic etched with a sodium naphthalene solution, and the silicone rubber layer is any one of the adhesive silicone rubbers for fluoroplastics obtained in claims 1-7.

10. The hose according to claim 9, characterized in that: The fluoroplastic is any one of PTFE, FEP, PFA and ETFE.

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