Production method of aluminum-based silica gel plate

Abstract

The invention relates to the technical field of silica gel processing, in particular to a production method of an aluminum-based silica gel plate, which specifically comprises the following steps: (1) taking 50-80 parts by mass of sodium silicate as a silicon source, adding 20-40 parts by mass of 20-30% nitric acid solution, and uniformly mixing and reacting in a reaction kettle to obtain initial gel; (2) carrying out aging treatment on the initial gel in a 100 DEG C autoclave by using a TEOS / ethanol mixed solution for 10-20 minutes to obtain aged gel; (3) soaking and acidizing the aged gel for 30-40 minutes by using an aluminum sulfate aqueous solution with the concentration of 30% at normal temperature to stabilize the skeleton structure of the gel, and washing with water until the pH value is 7-8 to obtain washed gel; and (4) coating the washed gel into a mold, carrying out synchronous foaming and vulcanization for 20-40 minutes, taking out, drying, and cutting. Experiments prove that the tensile property of the aluminum-based silica gel plate prepared by the method can be greatly improved, and meanwhile, the low density of the silica gel plate is ensured, so that the aluminum-based silica gel plate has the characteristics of low density and high strength.

Description

Technical Field

[0001] The invention relates to the technical field of silica gel processing, in particular to a production method of an aluminum-based silica gel plate. Background Art

[0002] Silicone sheet, usually refers to a sheet made of silicone rubber, which is a high-performance synthetic rubber with a variety of excellent physical and chemical properties. The manufacturing process of silicone sheet usually involves mixing silicone rubber base polymer, filler, vulcanizer and other additives, and then forming the sheet through heating and vulcanization process. Depending on the specific application requirements, silicone sheet can have different thickness, color and hardness. When choosing silicone sheet, you need to consider its chemical stability, temperature resistance, hardness and other physical properties to ensure that it meets the requirements of specific applications.

[0003] In the prior art, silicone sheets are usually made by mixing and melting raw materials, then calendering and then coating them, foaming and vulcanizing them. However, how to improve the density and mechanical properties of silicone sheets is an urgent problem to be solved. Summary of the invention

[0004] In order to solve the problems raised in the above background technology, the present invention provides a method for producing an aluminum-based silica gel plate.

[0005] To achieve the above object, the present invention provides the following technical solutions: A production method of an aluminum-based silica gel plate is as follows: (1) Taking 50-80 parts of sodium silicate as a silicon source, add 20-40 parts of 20%-30% nitric acid solution in a reaction kettle and mix them uniformly to obtain a primary gel; (2) subjecting the primary gel to aging treatment in an autoclave at 100° C. using a TEOS / ethanol mixed solution for 10 to 20 minutes to obtain an aged gel, thereby achieving the technical effect of enhancing its skeleton structure; (3) soaking the aged gel in a 30% aluminum sulfate aqueous solution for acidification at room temperature for 30 to 40 minutes to stabilize the skeleton structure of the gel, and then washing with water to a pH value of 7 to 8 to obtain a water-washed gel; (4) Apply the washed gel into a mold, add a foaming agent and a vulcanizing agent, and perform simultaneous foaming and vulcanization at 150° C. and normal pressure for 20 to 40 minutes. After completion, take out, dry, and cut to obtain the product.

[0006] Furthermore, the foaming agent is one or a combination of two of hydroxy silicone oil and azobisisobutyronitrile.

[0007] Furthermore, the vulcanizing agent is dibenzoyl peroxide.

[0008] Compared with the prior art, the present invention has the following beneficial effects: 1. Using aluminum sulfate aqueous solution instead of traditional acid agent to acidify the gel can effectively increase the aluminum content in the silica gel plate and greatly improve its tensile elongation at break; 2. Before using aluminum sulfate aqueous solution for acidification treatment, it is necessary to use TEOS / ethanol mixed solution for aging treatment, so that the skeleton structure in the gel is initially established, and aluminum ions have a place to attach, further improving the mechanical properties of the silica gel plate; 3. Before using aluminum sulfate aqueous solution for acidification treatment, nitric acid solution must be used for pickling reaction to generate gel. If only a single aluminum sulfate aqueous solution is used as an acid agent, the subsequent foaming effect will be poor and the density of the silica gel plate will be too high.

[0009] Through experiments, it is found that the aluminum-based silicone plate prepared by the method of the present invention can greatly improve the tensile performance of the silicone plate, while ensuring the low density of the silicone plate, so that it has the characteristics of low density and high strength. DETAILED DESCRIPTION Example 1

[0010] A production method of an aluminum-based silica gel plate is as follows: (1) Taking 50 parts of sodium silicate as a silicon source, add 20 parts of 20% nitric acid solution in a reaction kettle and mix them evenly to obtain a primary gel; (2) subjecting the primary gel to aging treatment in an autoclave at 100° C. using a TEOS / ethanol mixed solution for 10 minutes to obtain an aged gel, thereby achieving the technical effect of enhancing its skeleton structure; (3) soaking the aged gel in a 30% aluminum sulfate aqueous solution at room temperature for 30 minutes for acidification to stabilize the skeleton structure of the gel, and then washing with water to a pH value of 7 to 8 to obtain a water-washed gel; (4) The washed gel is applied into a mold, a foaming agent and a vulcanizing agent are added, and the mixture is simultaneously foamed and vulcanized at 150° C. under normal pressure for 20 minutes. After completion, the mixture is taken out, dried, and cut to obtain the obtained product.

[0011] Furthermore, the foaming agent is one or a combination of two of hydroxy silicone oil and azobisisobutyronitrile.

[0012] Furthermore, the vulcanizing agent is dibenzoyl peroxide. Example 2

[0013] A production method of an aluminum-based silica gel plate is as follows: (1) Taking 80 parts by mass of sodium silicate as a silicon source, adding 40 parts of a 30% nitric acid solution in a reaction kettle and uniformly mixing and reacting, to obtain a primary gel; (2) subjecting the primary gel to aging treatment in an autoclave at 100° C. using a TEOS / ethanol mixed solution for 20 minutes to obtain an aged gel, thereby achieving the technical effect of enhancing its skeleton structure; (3) soaking the aged gel in a 30% aluminum sulfate aqueous solution at room temperature for 40 minutes for acidification to stabilize the skeleton structure of the gel, and then washing with water to a pH value of 7 to 8 to obtain a water-washed gel; (4) The washed gel is applied to a mold, a foaming agent and a vulcanizing agent are added, and the mixture is simultaneously foamed and vulcanized at 150° C. under normal pressure for 40 minutes. After completion, the mixture is taken out, dried, and cut to obtain the obtained product.

[0014] Furthermore, the foaming agent is one or a combination of two of hydroxy silicone oil and azobisisobutyronitrile.

[0015] Furthermore, the vulcanizing agent is dibenzoyl peroxide. Example 3

[0016] A production method of an aluminum-based silica gel plate is as follows: (1) Taking 60 parts of sodium silicate as a silicon source, add 30 parts of 25% nitric acid solution in a reactor and mix them evenly to obtain a primary gel; (2) subjecting the primary gel to aging treatment in an autoclave at 100° C. using a TEOS / ethanol mixed solution for 15 minutes to obtain an aged gel, thereby achieving the technical effect of enhancing its skeleton structure; (3) soaking the aged gel in a 30% aluminum sulfate aqueous solution at room temperature for 35 minutes for acidification to stabilize the skeleton structure of the gel, and then washing with water to a pH value of 7 to 8 to obtain a water-washed gel; (4) The washed gel is applied to a mold, a foaming agent and a vulcanizing agent are added, and the mixture is simultaneously foamed and vulcanized at 150° C. and normal pressure for 25 minutes. After completion, the mixture is taken out, dried, and cut to obtain the product.

[0017] Furthermore, the foaming agent is one or a combination of two of hydroxy silicone oil and azobisisobutyronitrile.

[0018] Furthermore, the vulcanizing agent is dibenzoyl peroxide.

[0019] Comparative Example 1 Compared with Example 1, this comparative example does not adopt the aging treatment described in step (2), and the other method steps are the same as those in Example 1.

[0020] Comparative Example 2 Compared with Example 2, this comparative example does not adopt the acidification treatment of the aluminum sulfate aqueous solution described in step (3), and the other method steps are the same as those in Example 2.

[0021] Comparative Example 3 Compared with Example 3, in this comparative example, in step (3), an aqueous solution of aluminum sulfate is not used for acidification treatment, but a commonly used acid agent such as oxalic acid and hydrochloric acid is used for acidification treatment.

[0022] Control group Ordinary silicone sheets purchased on the market.

[0023] The silica gel plates prepared from the above three embodiments and three comparative embodiments, and the silica gel plates in the control group, a total of seven silica gel plates were cut into cylindrical strips with a diameter of 4 mm and a length of 50 mm, and the density and tensile elongation at break were tested respectively. The average results are shown in the following table:

[0024] It can be seen from the above table: 1. Using aluminum sulfate aqueous solution instead of traditional acid agent to acidify the gel can effectively increase the aluminum content in the silica gel plate and greatly improve its tensile elongation at break; 2. Before using aluminum sulfate aqueous solution for acidification treatment, it is necessary to use TEOS / ethanol mixed solution for aging treatment, so that the skeleton structure in the gel is initially established, and aluminum ions have a place to attach, further improving the mechanical properties of the silica gel plate; 3. Before using aluminum sulfate aqueous solution for acidification treatment, nitric acid solution must be used for pickling reaction to generate gel. If only a single aluminum sulfate aqueous solution is used as an acid agent, the subsequent foaming effect will be poor and the density of the silica gel plate will be too high.

[0025] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the equivalent elements of the claims be included in the invention. Any marking in a claim should not be considered as limiting the claim to which it relates.

[0026] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A method for producing an aluminum-based silica gel plate, characterized in that: The details are as follows: (1) Taking 50-80 parts of sodium silicate as a silicon source, add 20-40 parts of 20%-30% nitric acid solution in a reaction kettle and mix them evenly to obtain a primary gel; (2) subjecting the primary gel to aging treatment in an autoclave at 100° C. using a TEOS / ethanol mixed solution for 10 to 20 minutes to obtain an aged gel, thereby achieving the technical effect of enhancing its skeleton structure; (3) soaking the aged gel in a 30% aluminum sulfate aqueous solution for acidification at room temperature for 30 to 40 minutes to stabilize the skeleton structure of the gel, and then washing with water to a pH value of 7 to 8 to obtain a water-washed gel; (4) Apply the washed gel into a mold, add a foaming agent and a vulcanizing agent, and perform simultaneous foaming and vulcanization at 150° C. and normal pressure for 20 to 40 minutes. After completion, take out, dry, and cut to obtain the product.

2. The method for producing an aluminum-based silica gel plate according to claim 1, characterized in that: In step (1), preferably, 60 parts of sodium silicate are taken as silicon source, and 30 parts of 25% nitric acid solution are added in a reaction kettle for uniform mixing and reaction to obtain a primary gel.

3. The method for producing an aluminum-based silica gel plate according to claim 1, characterized in that: In step (2), the primary gel is preferably aged in an autoclave at 100° C. using a TEOS / ethanol mixed solution for 15 minutes to obtain an aged gel.

4. The method for producing an aluminum-based silica gel plate according to claim 1, characterized in that: In step (3), the aged gel is preferably treated with an acidification method by immersing the aged gel in a 30% aluminum sulfate aqueous solution at room temperature for 35 minutes to stabilize the skeleton structure of the gel, and then washed with water to a pH value of 7 to 8 to obtain a washed gel.

5. The method for producing an aluminum-based silica gel plate according to claim 1, characterized in that: In step (4), the water-washed gel is preferably coated into a mold, a foaming agent and a vulcanizing agent are added, and simultaneous foaming and vulcanization are performed at 150° C. and normal pressure for 25 minutes. After completion, the gel is taken out for drying and cutting.

6. The method for producing an aluminum-based silica gel plate according to any one of claims 1 to 5, characterized in that: The foaming agent is one or a combination of two of hydroxy silicone oil and azobisisobutyronitrile.

7. The method for producing an aluminum-based silica gel plate according to any one of claims 1 to 5, characterized in that: The vulcanizing agent is dibenzoyl peroxide.

Images