Preparation method of foaming sealing silica gel for clean room

Abstract

The invention discloses a preparation method of foamed sealing silica gel for a clean room, which comprises the following steps: mixing vinyl polysiloxane, silicon dioxide, hydroxyl-terminated polysiloxane and polysiloxane to form a component A glue solution, and mixing vinyl polysiloxane, silicon dioxide, hydroxyl-terminated polysiloxane, polysiloxane and polymethyl hydrogen-containing siloxane to form a component B glue solution, uniformly mixing and stirring the component A glue solution and the component B glue solution to form a component C glue solution, injecting the component C glue solution into a mold, heating to foam and cure the component C glue solution to form foamed sealing silica gel, taking the foamed sealing silica gel out of the mold, and cutting and polishing the foamed sealing silica gel; the prepared foaming sealing silica gel for the clean room has good sealing performance, durability and corrosion resistance, external pollutants are effectively prevented from entering the clean room, the indoor cleanliness is guaranteed, meanwhile, the foaming ratio of the material is high, foaming is uniform, a porous structure can be formed, and good sound insulation and heat insulation performance is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of foamed silica gel preparation technology, and in particular to a method for preparing foamed sealing silica gel for clean rooms. Background Art

[0002] In the construction and use of clean rooms, sealing performance is crucial. Good sealing can effectively prevent external pollutants from entering the clean room and ensure the cleanliness of the room. At present, commonly used clean room sealing materials include rubber, plastic, etc., but these materials have some disadvantages, such as unsatisfactory sealing effect, poor durability, easy aging, etc.

[0003] Two-component liquid silicone rubber has excellent properties, such as good high and low temperature resistance, corrosion resistance, insulation, sealing, etc. Applying it to the sealing of clean rooms can effectively improve the sealing effect and durability. However, there are still some problems with the application of two-component liquid silicone rubber in clean rooms, such as uneven foaming, low foaming ratio, insufficient strength, etc. Summary of the invention

[0004] In order to overcome the above shortcomings, the purpose of this application is to solve at least one of the deficiencies in the prior art, so a method for preparing foamed sealing silica gel for clean room is provided, and the specific scheme is as follows:

[0005] The present application provides a method for preparing foamed sealing silica gel for clean rooms, comprising the following steps:

[0006] Vinyl polysiloxane, silicon dioxide, hydroxyl-terminated polysiloxane and polysiloxane are mixed to form a component A glue solution.

[0007] Vinyl polysiloxane, silicon dioxide, hydroxyl-terminated polysiloxane, polysiloxane and polymethyl hydrogen siloxane are mixed to form a component B glue solution.

[0008] The component A glue solution and the component B glue solution are mixed, and a foaming agent and a catalyst are added to the mixed solution, and stirred evenly to form a component C glue solution.

[0009] The C component glue liquid is injected into the mold, and the C component glue liquid is foamed and cured by heating to form a foamed sealing silicone.

[0010] The foamed sealing silicone is taken out from the mold for cutting and grinding.

[0011] Furthermore, in the A component glue, the content of the vinyl polysiloxane is 40-70 parts, the content of the silicon dioxide is 10-30 parts, the content of the hydroxyl-terminated polysiloxane is 1-15 parts, and the content of the polysiloxane is 1-10 parts.

[0012] Furthermore, in the B component glue, the content of the vinyl polysiloxane is 40-70 parts, the content of the silicon dioxide is 10-30 parts, the content of the hydroxyl-terminated polysiloxane is 1-15 parts, and the content of the polysiloxane is 1-10 parts.

[0013] Furthermore, when preparing the A component glue solution, color paste is added to the vinyl polysiloxane, the silicon dioxide, the hydroxyl-terminated polysiloxane and the polysiloxane mixed glue solution.

[0014] Furthermore, in the A component glue solution, the content of the color paste is 1-10 points.

[0015] Furthermore, when preparing the B component glue solution, aluminum hydroxide is added to the mixed glue solution of the vinyl polysiloxane, the silicon dioxide, the hydroxyl-terminated polysiloxane, the polysiloxane and the polymethyl hydrogen-containing siloxane.

[0016] Furthermore, in the B component glue, the content of the aluminum hydroxide is 1-10 parts.

[0017] Furthermore, in the B component glue, the content of the polymethyl hydrogen siloxane is 5-20 parts.

[0018] Furthermore, after the mixed material is injected into the mold, the heating temperature is 60°C-80°C.

[0019] Furthermore, the process time of foaming and curing the C component glue by heating is 6 minutes to 10 minutes.

[0020] Beneficial Effects

[0021] The foamed sealing silicone for clean rooms prepared in the present application has good sealing performance, durability and corrosion resistance, can effectively prevent external pollutants from entering the clean room, and ensure the cleanliness of the room. At the same time, the material has a high foaming ratio and uniform foaming, and can form a porous structure with good sound insulation and heat insulation performance. The prepared foamed sealing silicone is applied to the sealing parts of the clean room, such as the connection between the wall and the ground, the connection between the door and window and the wall, the connection between the equipment and the pipeline, etc. During the application process, the foamed sealing silicone can be cut and spliced ​​as needed to adapt to different sealing parts and shapes. After curing, the sealing material forms a porous structure with certain strength and elasticity, which can effectively prevent external pollutants from entering the clean room, and also has good sound insulation and heat insulation performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide an understanding of the technical solution of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the technical solution of the present disclosure and do not constitute a limitation on the technical solution of the present disclosure. The shapes and sizes of the components in the accompanying drawings do not reflect the actual proportions and are only intended to illustrate the content of the present application.

[0023] Figure 1 The present invention is a flow chart of the preparation method of foamed sealing silicone for clean room use in this application.

[0024] Figure 2 Test results of silicone foam seal for this application Figure 1 .

[0025] Figure 3 Test results of silicone foam seal for this application Figure 2 .

[0026] Figure 4 Test results of silicone foam seal for this application Figure 3 .

[0027] Figure 5 Test results of silicone foam seal for this application Figure 4 . DETAILED DESCRIPTION

[0028] The above scheme is further described below in conjunction with specific examples. It should be understood that these examples are used to illustrate the present application and are not limited to the scope of the present application. The implementation conditions adopted in the examples can be further adjusted as the conditions of the specific manufacturer, and the unspecified implementation conditions are usually the conditions in conventional experiments.

[0029] Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should be understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connecting" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. In this article, "electrical connection" includes the situation where the constituent elements are connected together through an element with some electrical function. "Elements with some electrical function" are not particularly limited as long as they can transfer electrical signals between the connected constituent elements. "Elements with some electrical function" can be, for example, electrodes or wiring, or switching elements such as transistors, or other functional elements such as resistors, inductors or capacitors. "Up", "down", "left", "right", etc. are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0030] In this application, the directions or positional relationships indicated by the terms "upper", "lower", "inner", "middle", etc. are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0031] As described in the background technology, in the construction and use of clean rooms, sealing performance is of vital importance. Good sealing can effectively prevent external pollutants from entering the clean room and ensure the cleanliness of the room. At present, commonly used clean room sealing materials include rubber, plastic, etc., but these materials have some disadvantages, such as unsatisfactory sealing effect, poor durability, easy aging, etc. Two-component liquid silicone rubber has excellent properties, such as good high and low temperature resistance, corrosion resistance, insulation, sealing, etc. Applying it to the sealing of clean rooms can effectively improve the sealing effect and durability. However, there are still some problems about the application of two-component liquid silicone rubber in clean rooms, such as uneven foaming, low foaming ratio, insufficient strength, etc.

[0032] In view of the above content, the inventor provides a method for preparing foamed sealing silica gel for clean room, the method comprising:

[0033] S1, take 40-70 parts of vinyl polysiloxane, 10-30 parts of silicon dioxide, 1-15 parts of hydroxyl-terminated polysiloxane, 1-10 parts of polysiloxane, and 1-10 parts of color paste, mix and stir to form component A glue solution,

[0034] S2, take 40-70 parts of vinyl polysiloxane, 10-30 parts of silicon dioxide, 1-15 parts of hydroxyl-terminated polysiloxane, 5-20 parts of polymethyl hydrogen siloxane, 1-10 parts of polysiloxane, and 1-10 parts of aluminum hydroxide, and mix and stir to form component B glue.

[0035] S3, take the glue liquid of component A and the glue liquid of component B, mix and stir them in a ratio of 1:1, add a foaming agent and a catalyst to the mixed liquid, and stir evenly to form glue liquid of component C.

[0036] S4, inject the C component glue into the mold, heat it to 60℃-80℃, make the C component glue foam and solidify to form foaming sealing silicone, the reaction process lasts for 6-10 minutes,

[0037] S5. Take the foamed sealing silicone out of the mold for cutting and grinding.

[0038] 1. In the preparation process of this application, the preparation method is improved by adjusting the amount of each component and mixing the two components in a ratio of 1:1, thereby improving the sealing performance, durability and corrosion resistance of the foamed sealing silicone for clean rooms, effectively preventing external pollutants from entering the clean room and ensuring the cleanliness of the room.

[0039] 2. In the preparation process of the present application, component A and component B are first prepared and mixed in the same proportion, and then the foaming agent and catalyst are added to the mixed solution C of components A and B. This allows the foaming agent and catalyst to be evenly mixed with the mixed solution C. Compared with the traditional method of directly adding the foaming agent and catalyst to the solution of component A or component B, the foaming rate of the material can be effectively improved, the foaming is uniform, a porous structure can be formed, and it has good sound insulation and heat insulation properties.

[0040] 3. Apply the prepared foamed sealing silicone to the sealing parts of the clean room, such as the connection between the wall and the ground, the connection between the door and window and the wall, the connection between the equipment and the pipeline, etc. During the application process, the foamed sealing silicone can be cut and spliced ​​as needed to adapt to different sealing parts and shapes. After curing, the sealing material forms a porous structure with certain strength and elasticity, which can effectively prevent external pollutants from entering the clean room. At the same time, it also has good sound insulation and heat insulation properties.

[0041] Next, the present application is described exemplarily.

[0042] Embodiment 1:

[0043] An embodiment of the present application discloses a method for preparing a foamed sealing silica gel for a clean room, the preparation method comprising the following steps:

[0044] Take 55 parts of vinyl polysiloxane, 25 parts of silicon dioxide, 10 parts of hydroxyl-terminated polysiloxane, 5 parts of polysiloxane, and 5 parts of color paste and mix them to form component A glue.

[0045] Take 50 parts of vinyl polysiloxane, 15 parts of silicon dioxide, 10 parts of hydroxyl-terminated polysiloxane, 15 parts of polymethyl hydrogen siloxane, 5 parts of polysiloxane, and 5 parts of aluminum hydroxide and mix them to form a component B glue solution.

[0046] Take component A glue and component B glue, mix them in a ratio of 1:1, add foaming agent and catalyst into the mixture, and stir evenly to form component C glue.

[0047] Inject the C component glue into the mold and heat it to 70°C to make the C component glue foam and solidify to form foaming sealing silicone. The reaction process lasts for 8 minutes to form foaming sealing silicone.

[0048] Remove the foam sealing silicone from the mold for cutting and grinding.

[0049] Embodiment 2:

[0050] Take 40 parts of vinyl polysiloxane, 30 parts of silicon dioxide, 15 parts of hydroxyl-terminated polysiloxane, 10 parts of polysiloxane and 5 parts of color paste and mix them to form component A glue.

[0051] Take 40 parts of vinyl polysiloxane, 30 parts of silicon dioxide, 15 parts of hydroxyl-terminated polysiloxane, 5 parts of polymethyl hydrogen siloxane, 5 parts of polysiloxane, and 5 parts of aluminum hydroxide and mix them to form a component B glue solution.

[0052] Take component A glue and component B glue, mix them in a ratio of 1:1, add foaming agent and catalyst into the mixture, and stir evenly to form component C glue.

[0053] Inject the C component glue into the mold and heat it to 80°C to make the C component glue foam and solidify to form foaming sealing silicone. The reaction process lasts for 10 minutes to form foaming sealing silicone.

[0054] Remove the foam sealing silicone from the mold for cutting and grinding.

[0055] Embodiment 3:

[0056] Take 70 parts of vinyl polysiloxane, 10 parts of silicon dioxide, 9 parts of hydroxyl-terminated polysiloxane, 1 part of polysiloxane, and 10 parts of color paste and mix them to form component A glue.

[0057] Take 70 parts of vinyl polysiloxane, 10 parts of silicon dioxide, 1 part of hydroxyl-terminated polysiloxane, 9 parts of polymethyl hydrogen siloxane, 5 parts of polysiloxane, and 5 parts of aluminum hydroxide and mix them to form a component B glue solution.

[0058] Take component A glue and component B glue, mix them in a ratio of 1:1, add foaming agent and catalyst into the mixture, and stir evenly to form component C glue.

[0059] Inject the C component glue into the mold and heat it to 60°C to make the C component glue foam and solidify to form foaming sealing silicone. The reaction process lasts for 6 minutes to form foaming sealing silicone.

[0060] Remove the foam sealing silicone from the mold for cutting and grinding.

[0061] This scheme uses vinyl polydimethylsiloxane as a base polymer with good flexibility and sealing properties, silicon dioxide as a raw material for making silicone, hydroxyl-terminated polysiloxane and polymethyl hydrogen siloxane as cross-linking agent silicone oil, the cross-linking agent undergoes a cross-linking reaction with vinyl polydimethylsiloxane under the action of a catalyst to form a three-dimensional network structure, the foaming agent generates gas under certain conditions to foam the sealing material to form a porous structure, and the catalyst and inhibitor are used to control the speed of the cross-linking reaction and the foaming reaction, respectively.

[0062] The prepared foamed sealing silicone is applied to the joints between the doors and windows and the walls of the clean room. During the application process, the sealing material is cut into suitable sizes and then pasted at the joints between the doors and windows and the walls. It is pressed by hand to make it tightly combined with the doors and windows and the walls. After curing, the sealing material forms a porous structure with certain strength and elasticity, which can effectively prevent external pollutants from entering the clean room. It also has good sound insulation and heat insulation properties.

[0063] It should be noted that in the above embodiments 1, 2, and 3, the vinyl polysiloxane is taken in 40, 55, and 70 parts, and the amount of vinyl polysiloxane is between 40-70, so the vinyl polysiloxane can also take values ​​of 41, 42, 43...54, 56, 57, 58...69. According to the above-mentioned amount-taking principle, the silicon dioxide, hydroxyl-terminated polysiloxane, polysiloxane, aluminum hydroxide, color paste, etc. in the above embodiments can also be taken in this way.

[0064] It should be noted that the following are the test performance results of the clean room foam sealing silica gel prepared in Examples 1, 2, and 3 of the present application:

[0065] The foam sealing silicone was squeezed 100,000 times by simulating the opening and closing process of a steel door. The results are as follows: Figure 2 As shown, after 100,000 squeezes, the foam sealing silicone did not deform or fall off the test steel door.

[0066] Soak the foaming sealing silicone in 35% hydrogen peroxide for 35 days. Figure 3As shown, the foamed sealing silicone has not changed;

[0067] Place the foamed silicone under ultraviolet light for 240 hours. Figure 4 As shown, the foam sealing silicone has no discoloration or aging phenomenon.

[0068] After the foam sealing silicone was placed in 35% hydrogen peroxide and fumigated for 72 hours, there was no obvious discoloration, deformation, cracking or other signs of damage on the appearance of the foam sealing silicone, and there was no sign of corrosion on the surface.

[0069] Based on the above-mentioned foaming sealing silicone test performance results, the present application provides a method for preparing foaming sealing silicone for clean rooms. Through the dosage requirements of each component and 1:1 mixing of two components, the prepared foaming sealing silicone has significantly improved pressure resistance, corrosion resistance, aging resistance, etc., producing unexpected results.

[0070] The above embodiments are only for illustrating the technical concept and features of the present application, and their purpose is to enable people familiar with the technology to understand the content of the present application and implement it accordingly, and they cannot be used to limit the protection scope of the present application. Any equivalent transformation or modification made according to the spirit of the present application shall be included in the protection scope of the present application.

Claims

1. A method for preparing foamed sealing silica gel for clean room, characterized in that: The steps include: Take 40-70 parts of vinyl polysiloxane, 10-30 parts of silicon dioxide, 1-15 parts of hydroxyl-terminated polysiloxane, 1-10 parts of polysiloxane, and 1-10 parts of color paste, mix and stir to form component A glue solution. Take 40-70 parts of vinyl polysiloxane, 10-30 parts of silicon dioxide, 1-15 parts of hydroxyl-terminated polysiloxane, 5-20 parts of polymethyl hydrogen siloxane, 1-10 parts of polysiloxane, and 1-10 parts of aluminum hydroxide and mix and stir to form component B glue. Take component A glue and component B glue, mix them in a ratio of 1:1, add foaming agent and catalyst into the mixture, and stir evenly to form component C glue. Inject the C component glue into the mold, heat it to make the C component glue foam and solidify to form a foaming sealing silicone. Remove the foam sealing silicone from the mold for cutting and grinding.

2. The method for preparing foamed sealing silica gel for clean room according to claim 1, characterized in that: After the mixed material is injected into the mold, the heating temperature is 60°C-80°C.

3. The method for preparing foamed sealing silica gel for clean room according to claim 1, characterized in that: The process time of foaming and curing the C component glue by heating is 6 minutes to 10 minutes.

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