Anti-adhesion fluorinated silicone rubber mixture and preparation method thereof
By introducing PFA resin and peroxide crosslinking into fluorosilicone rubber to form a dense network, the adhesion problem between fluorosilicone rubber products and the substrate is solved, and the anti-adhesion performance at high temperatures is improved.
Patent Information
- Application Number
- CN202511271395.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-08
- Publication Date
- 2026-01-13
AI Technical Summary
Existing technologies are prone to adhesion when fluorosilicone rubber products are bonded to substrates for extended periods. Existing solutions also suffer from problems such as easy removal, poor high-temperature resistance, and limited applicability.
An anti-adhesion fluorosilicone rubber compound is used, which includes fluorosilicone rubber, silica, hydroxyl silicone oil, 2,5-dimethyl-2,5-dihexane and PFA resin. Through mixing and heat treatment, uniformly dispersed PFA resin particles are formed, creating a discrete low surface energy island structure. Combined with peroxide crosslinking, a dense network is formed to prevent adhesion.
It effectively prevents adhesion during long-term use at high temperatures, improves peel strength, enhances applicability, and solves the problem of adhesion between fluorosilicone rubber products and substrates.
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of semiconductors, and in particular to an anti-adhesion fluorosilicone rubber mixture and a manufacturing method. BACKGROUND
[0002] Fluorosilicone rubber (FSR) is a high-performance elastomer that combines the advantages of silicone and fluorine materials, with unique chemical structure and application value. With its "high and low temperature resistance of silicone + oil resistance of fluorine" double advantages, fluorosilicone rubber has become an irreplaceable key sealing and protection material in high-end manufacturing fields such as aerospace, automobile, electronics, and medical treatment. In the future, with the development of emerging industries such as new energy vehicles, semiconductor technology, low-altitude economy, and biomedicine, its demand will continue to grow.
[0003] However, in some fields, the sealing products made of fluorosilicone rubber will produce adhesion phenomenon after long-term adhesion to the base material due to the combined action of enhanced physical-chemical interaction and material migration, affecting the normal use of the equipment. The existing technology usually adopts the following schemes to solve the problem of adhesion of fluorosilicone rubber sealing products to the base material for a long time; 1. Surface treatment: 1.1 Surface spraying / immersion of emulsified silicone oil isolation film; The disadvantage of this scheme is that the isolation film is easy to be erased during transportation / assembly, and the risk of re-adhesion is high.
[0004] 1.2 Primer + anti-adhesion coating system, such as fluorosilane coupling agent primer + fluorocarbon-epoxy isolation paint. The disadvantage of this scheme is that the film is too thick and easy to crack, and too thin to prevent adhesion.
[0005] 2. Add anti-adhesion additives in the formula: add PTFE micro powder, polyethylene wax or MQ silicone resin. The disadvantage of this scheme is that the adhesion phenomenon is even more serious at high temperature (greater than 150 ℃) for a long time.
[0006] 3. Fully two-stage vulcanization, the disadvantage of this scheme is high energy consumption, long cycle, and easy deformation of small size products.
[0007] 4. Surface micro-texture / convex point design, mold etching convex, reducing the actual contact area. The disadvantage of this scheme is that it is only suitable for molded products, and cannot be implemented for extruded or calendered parts. SUMMARY
[0008] A series of simplified concepts are introduced in the part of the summary of the invention, which are simplified from the prior art in the field, which will be further described in detail in the part of the specific embodiments. The part of the summary of the invention does not mean to try to limit the key features and necessary technical features of the claimed technical solutions, nor does it mean to try to determine the protection scope of the claimed technical solutions.
[0009] The technical problem to be solved by the present application is to provide an anti-sticking fluorosilicone rubber mixture which can avoid the sticking phenomenon of fluorosilicone rubber products long-term attached to the base material.
[0010] To solve the above technical problems, the anti-sticking fluorosilicone rubber mixture provided by the present application comprises, based on 100 parts by weight of the anti-sticking fluorosilicone rubber mixture: fluorosilicone rubber, 100 parts by weight; white carbon black, 10-30 parts by weight; hydroxyl silicone oil, 3-10 parts by weight; 2,5-dimethyl-2,5-dihexane, 1-5 parts by weight; PFA resin, 3-20 parts by weight.
[0011] For example, the fluorosilicone rubber can be 100 parts by weight, 95 parts by weight, 90 parts by weight, 85 parts by weight, 80 parts by weight, 75 parts by weight, 70 parts by weight or 60 parts by weight.
[0012] The white carbon black can be 10 parts by weight, 15 parts by weight, 20 parts by weight, 25 parts by weight or 30 parts by weight.
[0013] The hydroxyl silicone oil can be 3 parts by weight, 5 parts by weight, 8 parts by weight or 10 parts by weight.
[0014] The 2,5-dimethyl-2,5-dihexane can be 1 part by weight, 3 parts by weight or 5 parts by weight.
[0015] The PFA resin can be 3 parts by weight, 6 parts by weight, 10 parts by weight, 15 parts by weight or 20 parts by weight.
[0016] Preferably, the anti-sticking fluorosilicone rubber mixture is further improved, and the PFA resin is a perfluoroalkoxy resin or a meltable polytetrafluoroethylene.
[0017] To solve the above technical problems, the anti-sticking fluorosilicone rubber mixture provided by the present application is prepared by the method, which is used to prepare the anti-sticking fluorosilicone rubber mixture, comprising: providing fluorosilicone rubber, white carbon black, hydroxyl silicone oil, 2,5-dimethyl-2,5-dihexane and PFA resin with specified parts by weight; mixing by an open mill or a kneader; Preferably, the method for preparing the anti-adhesion fluorosilicone rubber mixture is further improved by mixing at a temperature range of 70°C-80°C.
[0018] For example, the mixing temperature can be 71°C, 72°C, 73°C, 74°C, 75°C, 76°C, 77°C, 78°C, 79°C, or 80°C.
[0019] Preferably, the method for preparing the anti-adhesion fluorosilicone rubber mixture is further improved, with a mixing time range of 20 min to 120 min.
[0020] For example, the mixing time can be 25 min, 35 min, 40 min, 45 min, 50 min, 55 min, or 60 min.
[0021] The principle of this invention: PFA resin has a melting point much higher than the vulcanization temperature of fluorosilicone rubber. After mixing, it is uniformly dispersed as submicron particles. The PFA resin particles slightly melt and migrate to the fluorosilicone rubber-substrate interface, forming a continuous elastomer with a discrete low surface energy island topology. 2,5-Dimethyl-2,5-dihexane (peroxide) vulcanization forms a dense network, preventing further aggregation of PFA resin particles; it also "anchors" the PFA resin particles, preventing long-term migration and loss. Silica provides mechanical strength and, through the hydroxyl groups, forms a hydrogen bond network with hydroxyl silicone oil, reducing cold flow and compression set. The hydroxyl silicone oil provides internal lubrication and inhibits excessive PFA resin aggregation, ensuring uniform distribution of PFA resin particles.
[0022] This invention introduces a controllable amount of PFA resin microparticles into a fluorosilicone rubber matrix, and combines this with peroxide crosslinking and post-heat treatment to achieve a "built-in" anti-adhesion interface, which takes into account long-term heat resistance, media resistance and low peel force, thus solving the technical problem of easy adhesion of fluorosilicone rubber to substrates over long-term bonding. Detailed Implementation
[0023] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can fully understand other advantages and technical effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through different specific embodiments, and the details in this specification can also be applied based on different viewpoints, with various modifications or changes made without departing from the overall design concept of the invention. It should be noted that, unless otherwise specified, the following embodiments and features can be combined with each other. The following exemplary embodiments of the present invention can be implemented in many different forms and should not be construed as being limited to the specific embodiments set forth herein. It should be understood that these embodiments are provided to make the disclosure of the present invention thorough and complete, and to fully convey the technical solutions of these exemplary embodiments to those skilled in the art.
[0024] First embodiment; This invention provides an anti-adhesion fluorosilicone rubber compound, which comprises the following components by weight: Fluorosilicone rubber, 100 parts by weight; Silica, 20 parts by weight; Hydroxy silicone oil, 6 parts by weight; 2,5-Dimethyl-2,5-dihexane, 3 parts by weight; PFA resin, 5 parts by weight; The method for preparing the anti-adhesion fluorosilicone rubber mixture provided in this embodiment is as follows: under the conditions of a mixing temperature range of 70℃-80℃ and a mixing time range of 20min-120min, a specified weight of fluorosilicone rubber, silica, hydroxyl silicone oil, 2,5-dimethyl-2,5-dihexane and PFA resin are provided and mixed uniformly using an open mill or kneader. After hot pressing vulcanization and high-temperature treatment, a test sample is prepared.
[0025] Second embodiment; This invention provides an anti-adhesion fluorosilicone rubber compound, which comprises the following components by weight: Fluorosilicone rubber, 100 parts by weight; Silica, 25 parts by weight; Hydroxy silicone oil, 6 parts by weight; 2,5-Dimethyl-2,5-dihexane, 3 parts by weight; PFA resin, 10 parts by weight; The method for preparing the anti-adhesion fluorosilicone rubber mixture provided in this embodiment is as follows: under the conditions of a mixing temperature range of 70℃-80℃ and a mixing time range of 20min-120min, a specified weight of fluorosilicone rubber, silica, hydroxyl silicone oil, 2,5-dimethyl-2,5-dihexane and PFA resin are provided and mixed uniformly using an open mill or kneader. After hot pressing vulcanization and high-temperature treatment, a test sample is prepared.
[0026] Third embodiment; This invention provides an anti-adhesion fluorosilicone rubber compound, which comprises the following components by weight: Fluorosilicone rubber, 100 parts by weight; 15 parts by weight of silica; Hydroxy silicone oil, 8 parts by weight; 2,5-Dimethyl-2,5-dihexane, 3 parts by weight; 15 parts by weight of PFA resin; The method for preparing the anti-adhesion fluorosilicone rubber mixture provided in this embodiment is as follows: under the conditions of a mixing temperature range of 70℃-80℃ and a mixing time range of 20min-120min, a specified weight of fluorosilicone rubber, silica, hydroxyl silicone oil, 2,5-dimethyl-2,5-dihexane and PFA resin are provided and mixed uniformly using an open mill or kneader. After hot pressing vulcanization and high-temperature treatment, a test sample is prepared.
[0027] Fourth embodiment; This invention provides an anti-adhesion fluorosilicone rubber compound, which comprises the following components by weight: Fluorosilicone rubber, 100 parts by weight; 10 parts by weight of silica; Hydroxy silicone oil, 10 parts by weight; 2,5-Dimethyl-2,5-dihexane, 3 parts by weight; PFA resin, 20 parts by weight; The method for preparing the anti-adhesion fluorosilicone rubber mixture provided in this embodiment is as follows: under the conditions of a mixing temperature range of 70℃-80℃ and a mixing time range of 20min-120min, a specified weight of fluorosilicone rubber, silica, hydroxyl silicone oil, 2,5-dimethyl-2,5-dihexane and PFA resin are provided and mixed uniformly using an open mill or kneader. After hot pressing vulcanization and high-temperature treatment, a test sample is prepared.
[0028] First comparative example; This invention provides an anti-adhesion fluorosilicone rubber compound, which comprises the following components by weight: Fluorosilicone rubber, 100 parts by weight; 15 parts by weight of silica; Hydroxy silicone oil, 8 parts by weight; 2,5-Dimethyl-2,5-dihexane, 3 parts by weight; PFA resin, 3 parts by weight; The method for preparing the anti-adhesion fluorosilicone rubber mixture provided in this comparative example is as follows: under the conditions of a mixing temperature range of 70℃-80℃ and a mixing time range of 20min-120min, a specified weight of fluorosilicone rubber, silica, hydroxyl silicone oil, 2,5-dimethyl-2,5-dihexane and PFA resin are provided, mixed uniformly by an open mill or kneader, and then the test sample is prepared after hot pressing vulcanization and high temperature treatment.
[0029] Second comparative example; This invention provides an anti-adhesion fluorosilicone rubber compound, which comprises the following components by weight: Fluorosilicone rubber, 100 parts by weight; 15 parts by weight of silica; Hydroxy silicone oil, 8 parts by weight; 2,5-Dimethyl-2,5-dihexane, 3 parts by weight; PFA resin, 25 parts by weight; The method for preparing the anti-adhesion fluorosilicone rubber mixture provided in this comparative example is as follows: under the conditions of a mixing temperature range of 70℃-80℃ and a mixing time range of 20min-120min, a specified weight of fluorosilicone rubber, silica, hydroxyl silicone oil, 2,5-dimethyl-2,5-dihexane and PFA resin are provided, mixed uniformly by an open mill or kneader, and then the test sample is prepared after hot pressing vulcanization and high temperature treatment.
[0030] The effects of the products at each temperature point within the mixing temperature range of the above embodiments and comparative examples on performance testing are within acceptable industrial deviations and can therefore be ignored.
[0031] Performance testing: Peel strength: Tested according to the test standard provided in GB / T 7122-1996; Peel force tests were conducted on the anti-adhesion fluorosilicone rubber mixtures obtained in the first to fourth embodiments, as well as the anti-adhesion fluorosilicone rubber mixture / metal composite test samples obtained in the first and second comparative examples, according to the above test methods. The test results are shown in Table 1. Table 1, Peel strength of fluorosilicone rubber / aluminum at 90°; Peeling strength (unit: N / cm) Peeling strength after 200°C 7-day aging (unit: N / cm) First embodiment 25 30 Second embodiment 32 36 Third embodiment 26 32 Fourth embodiment 23 28 First comparative example 45 58 Second comparative example 22 26 According to the data in Table 1, the peel force of the anti-adhesion fluorosilicone rubber mixture provided by the present invention can reach below 40 N / cm after aging, and the anti-adhesion performance is even better after high temperature treatment.
[0032] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It will also be understood that, unless explicitly defined herein, terms such as those defined in a general dictionary shall be interpreted as having the meaning consistent with their meaning in the relevant field context, and not as having an idealized or overly formal meaning.
[0033] The present invention has been described in detail above through specific embodiments and examples, but these are not intended to limit the invention. Many modifications and improvements can be made by those skilled in the art without departing from the principles of the invention, and these should also be considered within the scope of protection of the present invention.
Claims
1. An anti-adhesion fluorosilicone rubber compound, characterized in that, Based on 100 parts by weight of the anti-blocking fluorosilicone rubber compound, it comprises: Fluorosilicone rubber, 100 parts by weight; Silica, 10-30 parts by weight; Hydroxy silicone oil, 3-10 parts by weight; 2,5-Dimethyl-2,5-dihexane, 1-5 parts by weight; PFA resin, 3-20 parts by weight.
2. The anti-adhesion fluorosilicone rubber compound as described in claim 1, characterized in that: PFA resin is a perfluoroalkoxy resin or meltable polytetrafluoroethylene.
3. A method for preparing an anti-adhesion fluorosilicone rubber compound, used to prepare the anti-adhesion fluorosilicone rubber compound of claim 1, characterized in that, include: Provide specified parts by weight of fluorosilicone rubber, silica, hydroxyl silicone oil, 2,5-dimethyl-2,5-dihexane and PFA resin; Mix using an open mill or kneader.
4. The method for preparing the anti-adhesion fluorosilicone rubber mixture as described in claim 3, characterized in that: The mixing temperature range is 70℃-80℃.
5. The method for preparing the anti-adhesion fluorosilicone rubber mixture as described in claim 3, characterized in that: The mixing time range is 20 min to 120 min.