Processing method of oil-emitting silica gel

Abstract

The invention relates to a processing method of oil-emitting silica gel, which can be used for manufacturing oil-emitting silica gel in a small batch based on an open mill or manufacturing oil-emitting silica gel in a large batch based on an internal mixer, and comprises the following steps of: when mixing silica gel rubber compound and 150BS base oil on the open mill, stretching and spreading out a stretched sheet, dripping the 150BS base oil, rolling up the silica gel, and repeatedly blanking on the open mill, thereby obtaining the oil-emitting silica gel. Stretching the sheet, spreading, adding oil, repeating the steps, and mixing to obtain the oil-emitting silica gel. And mixing on an internal mixer, adding the silica gel rubber compound into the internal mixer, mixing for a period of time, pouring 150BS base oil to be added, mixing into a cluster, adding a vulcanizing agent, mixing again, pouring out a pulling piece, and carrying out compression molding to obtain the oil-emitting silica gel. According to the invention, the oil leakage loss can be effectively slowed down, the manufacturing process is simple, the investment cost is reduced, the primer can be freely selected, the amount of the added oil can be increased or reduced according to the requirements of products and customers, and customization as required is really realized.

Description

Technical Field

[0001] This invention relates to the field of silicone manufacturing technology, and in particular to the manufacturing of silicone that leaks oil. Background Technology

[0002] Oily silicone (also known as self-lubricating silicone) products on the market mostly use dimethyl or carboxylated silicone oil as the filler carrier. Its viscosity is relatively low, and the oily feel on the surface of the silicone products is not obvious. Moreover, it is easy to lose oil during long-term storage. The storage time should not be too long, otherwise the oil will accumulate on the packaging bag, and there will be almost no oil on the product. The longer the storage time, the more obvious the oil disappears.

[0003] In addition, regarding the rubber mixing process, ordinary silicone manufacturers generally only have open mills. After wrapping the rollers with oil, the machine has no shearing force, which causes the originally clumped rubber material to become more and more scattered as it is mixed, making it difficult to form a roll. Many technicians cannot find a good solution and stop here, or they have to add powder and oil to mix, which increases the hardness and prolongs the mixing time. This also reduces the material properties and makes it difficult to reduce costs. Summary of the Invention

[0004] The purpose of this invention is to provide a processing method for producing oily silica gel in small batches using an open mill or in large batches using an internal mixer. This method can not only effectively reduce oil loss, but also has a simple manufacturing process and reduces investment costs.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A processing method for producing oily silicone rubber in small batches using a single open mill involves mixing silicone rubber compound and 150BS base oil on the open mill, and includes the following steps: 1) First, prepare a certain amount of silicone rubber compound and 150BS base oil; 2) Pull out a long sheet of silicone rubber on a two-roll mill and spread it out. Then, evenly drip 150BS base oil onto one side of the spread silicone rubber. Roll up the silicone rubber and feed it back onto the two-roll mill 5-6 times. Pull out a long sheet and spread it out again. Add oil again. Repeat this process 4-5 times until all the prepared 150BS base oil is added. The resulting silicone rubber will be oily.

[0006] A further improvement of the above scheme is that when dripping 150BS base oil onto one side of the spread-out silicone surface, the dripping area is controlled within 2-3cm of the silicone edge.

[0007] The above scheme is further described in that the silicone rubber compound and 150BS base oil are in the following proportions by weight: 100 parts silicone rubber compound and 20-50 parts 150BS base oil.

[0008] To achieve the above objectives, the present invention may also employ the following technical solutions: A processing method suitable for mass production of oily silicone rubber. This method involves mixing silicone rubber compound and 150BS base oil in an internal mixer, and includes the following steps: S1. First, prepare a certain amount of silicone rubber compound, 150BS base oil and vulcanizing agent. Clean the silicone rubber compound and set it aside. S2. After mixing the silicone rubber compound in a mixer for a period of time, pour in the 150BS base oil to be added. After mixing into a ball, add the vulcanizing agent and mix for another 1-2 minutes. Then pour out the sheet and wait for molding to obtain the oily silicone.

[0009] A further improvement in the above scheme is that, in step S2, 150BS base oil is added at a mixing temperature of 90-95℃.

[0010] The above scheme is further described in that the silicone rubber compound, 150BS base oil and vulcanizing agent are in the following proportions by weight: 100 parts silicone rubber compound, 20-50 parts 150BS base oil and 0.5-2 parts vulcanizing agent.

[0011] Furthermore, the vulcanizing agent described above is a di(2,5)-pentasulfide agent.

[0012] Using the above method, this invention enables the secondary processing of silicone rubber into low-cost oil-leaking silicone rubber. This not only effectively reduces oil loss but also simplifies the manufacturing process and lowers investment costs. It is suitable for ordinary silicone product factories with only one open mill, or for large-scale (over 300 kg) production of oil-leaking silicone rubber using an internal mixer. By secondary processing of existing silicone rubber, low-cost oil-leaking silicone rubber can be produced. According to market cost analysis, the price of oil-leaking silicone rubber purchased directly from silicone raw material manufacturers is between 35-50 yuan / kg, while using the above method, the price can be reduced to approximately 20 yuan / kg.

[0013] Another advantage of this invention is that there are not many models of oil-absorbing silicone available on the market. With the method of this invention, the base adhesive can be freely selected, and different brands from different manufacturers with different properties can be used. The amount of oil added can also be increased or decreased according to the product and customer needs, truly achieving customization on demand. Detailed Implementation

[0014] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following detailed description of the specific implementation methods, structures, features and effects of the present invention, in conjunction with preferred embodiments, is provided below. Example 1:

[0015] This method, based on a two-roll mill setup, enables the secondary processing of different grades of silicone rubber compounds into oily silicone rubber. It is suitable for small silicone product factories requiring only one two-roll mill to produce oily silicone rubber. The method involves mixing silicone rubber compounds and 150BS base oil on a two-roll mill, and includes the following steps: 1) First, prepare a certain amount of silicone rubber compound and 150BS base oil. The preferred weight proportions of silicone rubber compound and 150BS base oil are: 100 parts of silicone rubber compound and 20-50 parts of 150BS base oil. 2) Pull the silicone rubber compound out into a long sheet on the open mill and spread it out. Then, evenly drip 150BS base oil onto one side of the spread silicone rubber surface. When dripping the oil, control the dripping area within 2-3cm of the silicone rubber edge. Then roll up the silicone rubber and feed it onto the open mill repeatedly 5-6 times. Pull out the long sheet again, spread it out, and add oil again. Repeat this process 4-5 times until all the prepared 150BS base oil is added. The mixture will then be mixed to obtain the oily silicone rubber.

[0016] This invention utilizes the high viscosity of 150BS base oil (kinematic viscosity of 471.3 mm² / s at 40°C) and a flash point of 274°C. When added to silica gel, the high viscosity slows down the rate of oil seepage and loss, while the high flash point ensures it is not easily volatilized in air, making it safe to use and minimizing loss. The 150BS base oil is applied to the silica gel surface in measured amounts in several batches. The silica gel is then rolled up and repeatedly fed and pressed onto a two-roll mill. This avoids direct contact between the oil and the rollers, preventing oil loss and slippage, ensuring the 150BS base oil is fully and evenly dispersed in the silica gel. This achieves the effect of proportional oil blending, resulting in silica gel with stable oil seepage quality in the later stages, meeting the requirements for normal product use.

[0017] Using this method, 20 kg of oily silicone can be produced in 35 minutes on a 14-inch open mill, reducing the cost of the previously high-cost oily silicone. Small product factories can also easily produce it using only an open mill. Example 2:

[0018] If the aforementioned oily silicone rubber needs to be produced in large quantities (over 300 kg), this invention also proposes a processing method for producing oily silicone rubber from different grades of silicone rubber compounds through secondary processing. This processing method involves mixing silicone rubber compounds and 150BS base oil in an internal mixer, and includes the following steps: S1. First, prepare a certain amount of silicone rubber compound, 150BS base oil, and vulcanizing agent. Clean the silicone rubber compound thoroughly and set aside. The silicone rubber compound, 150BS base oil, and vulcanizing agent are in the following weight proportions: 100 parts silicone rubber compound, 20-50 parts 150BS base oil, and 0.5-2 parts vulcanizing agent. The preferred vulcanizing agent is bis(2,5)5 vulcanizing agent. S2. After mixing the silicone rubber compound in a Banbury mixer for a period of time, add the required 150BS base oil. The mixing time is directly proportional to the amount of rubber. After the compound forms a ball, add the vulcanizing agent and mix for another 1-2 minutes. Then, pour out the mixture, stretch it into sheets, and mold it to obtain oil-filled silicone rubber. In step S2, it is preferable to add the 150BS base oil at a mixing temperature of 90-95℃. At this temperature, the silicone rubber absorbs the oil and forms balls more quickly, which helps to improve the mixing efficiency and meet the requirements for mass production of oil-filled silicone rubber.

[0019] When producing silicone using a 35L internal mixer, first add 35 kg of cleaned silicone to the mixer and mix for a period of time. Then add 150BS base oil, mix until it forms a ball, add vulcanizing agent, and mix for another 1-2 minutes before pouring it out to form sheets for molding. The whole process takes 8-10 minutes and has high rubber mixing efficiency, meeting the requirements for mass production of silicone with oil leakage of 300 kg or more.

[0020] This invention enables the secondary processing of silicone rubber compounds to produce low-cost, oil-leaking silicone rubber. It not only effectively reduces oil loss but also simplifies the manufacturing process and lowers investment costs. It is suitable for ordinary silicone product factories with only one open mill, allowing for secondary processing of existing silicone rubber compounds to create low-cost, oil-leaking silicone rubber. Market cost analysis shows that the price of oil-leaking silicone rubber purchased directly from silicone rubber manufacturers is between 35-50 yuan / kg, while the above method can reduce the price to around 20 yuan / kg. Furthermore, given the limited selection of oil-leaking silicone rubber models currently available on the market, the method of this invention allows for free selection of the base rubber (the silicone rubber compound is an existing product). It can be silicone rubber compounds with different properties and from different manufacturers, and the amount of oil added can be increased or decreased according to product and customer needs, truly achieving customization to meet market demands.

[0021] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A processing method for oily silicone, characterized in that, This processing method is based on the small-batch production of oily silica gel using a single open mill. It involves mixing silica gel compound and 150BS base oil on the open mill, and includes the following steps: 1) First, prepare a certain amount of silicone rubber compound and 150BS base oil; 2) Pull out a long sheet of silicone rubber on a two-roll mill and spread it out. Then, evenly drip 150BS base oil onto one side of the spread silicone rubber. Roll up the silicone rubber and feed it back onto the two-roll mill 5-6 times. Pull out a long sheet and spread it out again. Add oil again. Repeat this process 4-5 times until all the prepared 150BS base oil is added. The resulting silicone rubber will be oily.

2. The processing method for oil-leaking silicone according to claim 1, characterized in that, When dripping 150BS base oil onto one side of the spread-out silicone surface, the dripping area should be controlled within 2-3cm of the silicone edge.

3. The processing method for oil-leaking silicone according to claim 1, characterized in that, The silicone rubber compound and 150BS base oil are in the following proportions by weight: 100 parts silicone rubber compound and 20-50 parts 150BS base oil.

4. A processing method for oily silicone, characterized in that, This processing method is suitable for mass production of oily silicone rubber. It involves mixing silicone rubber compound and 150BS base oil in an internal mixer, and includes the following steps: S1. First, prepare a certain amount of silicone rubber compound, 150BS base oil and vulcanizing agent. Clean the silicone rubber compound and set it aside. S2. After mixing the silicone rubber compound in a mixer for a period of time, pour in the 150BS base oil to be added. After mixing into a ball, add the vulcanizing agent and mix for another 1-2 minutes. Then pour out the sheet and wait for molding to obtain the oily silicone.

5. The processing method for oil-leaking silicone according to claim 4, characterized in that, In step S2, 150BS base oil is added at a mixing temperature of 90-95℃.

6. The processing method for oil-leaking silicone according to claim 4, characterized in that, The silicone rubber compound, 150BS base oil, and vulcanizing agent are in the following proportions by weight: 100 parts silicone rubber compound, 20-50 parts 150BS base oil, and 0.5-2 parts vulcanizing agent.

7. The processing method for oil-leaking silicone according to claim 4 or 6, characterized in that, The vulcanizing agent is a di-25 vulcanizing agent.