Electrospinning method of two-component silicone rubber

Abstract

The application discloses a kind of electrospinning methods of two-component silicone rubber, the method is to dissolve the raw material of silicone rubber into organic solvent, and is configured as A, B two-component spinning precursor solution, carries out double-channel high-voltage electrospinning in electrostatic spinning device, and by adjusting the ratio of A, B component and the ratio of crosslinking agent and catalyst and raw material, different performance silicone rubber is obtained.A, B component spinning solution is respectively placed in a, b two different channels of electrostatic spinning machine, and double-channel electrospinning is carried out.The raw material of silicone rubber is successfully spun to prepare finished product silicone rubber, and the problem that traditional silicone rubber is difficult to dissolve in polar and non-polar solvents and cannot be electrospun is overcome, and a breakthrough of prior art is realized.

Description

Technical Field

[0001] This invention relates to an electrospinning method and application of two-component silicone rubber, belonging to the field of electrospinning technology and application. Background Technology

[0002] Silicone rubber is a very important polymer material with excellent electrical insulation, oxygen resistance, aging resistance, and chemical stability. It also exhibits good high-temperature resistance, allowing for continuous use at 180-200℃. It has wide applications in industries such as construction, electronics, wire and cable, automotive, aerospace, and photovoltaics. Furthermore, due to its good biocompatibility and excellent physical and mechanical properties, silicone rubber can be used in the medical and healthcare fields to manufacture infusion tubes, various catheters, drainage tubes, cosmetic and repair materials, artificial skin, drug delivery systems, and biosensors.

[0003] There are three main processing methods for silicone rubber: compression molding, injection molding, and extrusion, which limit its application in many scenarios. In traditional processing, molded silicone rubber is difficult to dissolve in solvents. If unmolded raw materials are used for electrospinning, the silicone rubber tends to solidify during the spinning process, clogging the spinning needles and preventing spinning. This invention utilizes electrospinning technology to spin silicone rubber raw materials into two components, which are then solidified on a receiving device. By adjusting parameters, silicone rubber products of different shapes and thicknesses can be obtained, thus broadening the application areas of silicone rubber. Summary of the Invention

[0004] This invention utilizes electrospinning technology to spin silicone rubber raw materials into two components, which are then immediately solidified on a receiving device. By adjusting parameters, silicone rubber products of different shapes and thicknesses can be obtained. This overcomes the problem that traditional silicone rubber is difficult to dissolve in both polar and non-polar solvents and cannot be electrospinned, achieving a breakthrough in existing technology, broadening the application fields of silicone rubber, and promoting the rapid development and widespread application of silicone rubber in various industries.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a method for electrospinning two-component silicone rubber and its application, comprising the following steps:

[0006] Step 1: Knead 100 parts of vinyl silicone oil with a viscosity of 4000-10000 mPa·s, 4-8 parts of hexamethyldisilazane, 2-4 parts of deionized water, and 5-15 parts of silica in a kneader at 120-150℃ for 4 hours, and then let it cool naturally to obtain the base rubber for silicone rubber spinning.

[0007] Step 2: Divide the raw materials for preparing silicone rubber into two components, A and B. Take a certain amount of the base rubber of component A, dissolve it in an organic solvent, add an appropriate amount of crosslinking agent, and prepare spinning solution A. Take a certain amount of the base rubber of component B, dissolve it in an organic solvent, add an appropriate amount of catalyst, and prepare spinning solution B.

[0008] Step 3: Take the spinning solutions of components A and B from Step 2 and perform dual-channel high-voltage electrospinning in two different spinning channels a and b to prepare silicone rubber.

[0009] The crosslinking agent is hydrogen-containing silicone oil, with an addition amount of 10%-20% and a hydrogen content of 1%-2%.

[0010] The catalyst added during the experiment was a platinum-based catalyst, with an addition amount of 5000-8000 ppm and a platinum content of 3000 ppm.

[0011] The organic solvent used to prepare the spinning precursor solution is dichloromethane, dichloroethane, or acetone.

[0012] The concentration of the prepared spinning solution is 15%-50%, and spinning solution A and spinning solution B can be of equal or unequal concentration.

[0013] During high-voltage electrospinning, channels a and b maintain a consistent voltage of 12-15 kV, a consistent injection speed of 10-20 mL / min, and a consistent receiving distance of 10-20 cm. The electrospinning temperature is 60-80℃, and the humidity is 20-50%.

[0014] By receiving the mixture of materials spun in the dual-channel system, a silicone rubber product with stable, uniform properties and controllable thickness is obtained. Detailed Implementation

[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0016] This invention is the first to propose an electrospinning method for two-component silicone rubber and its application.

[0017] Example 1

[0018] Weigh 100g of vinyl silicone oil with a viscosity of 5000 mPa·s, 6g of hexamethyldisilazane, and 3g of deionized water, and stir until homogeneous at room temperature. Then weigh 5g of silica and add it to the above raw materials in batches, stirring until homogeneous. Heat the mixture to 120℃ and stir thoroughly for 4 hours, then allow it to cool naturally to room temperature to obtain the base compound. Weigh 15g of the base compound, add 2.5g of hydrogen-containing silicone oil (with a hydrogen content of 1.18%) as a crosslinking agent, stir until homogeneous, and dissolve in 60g of dichloromethane solvent to obtain the spinning agent. Spinning solution A: Weigh 15g of the base rubber compound again, add 30μL of platinum catalyst (platinum content 3000ppm), stir evenly, and dissolve in 60g of dichloromethane solvent to obtain spinning solution B. Take the above spinning solutions A and B and perform dual-channel high-voltage electrospinning in two different spinning channels a and b. The voltage in channels a and b is kept consistent at 12kV, the injection speed is consistent at 10mL / min, and the receiving distance is consistent at 15cm. The finished silicone rubber product is obtained at the receiving end. The tensile strength of the silicone rubber is 1.7MPa, the elongation at break is 97%, and the tear strength is 1.76kN / m.

[0019] Example 2

[0020] Weigh 100g of vinyl silicone oil with a viscosity of 10000mPa·s, 6g of hexamethyldisilazane, and 3g of deionized water, and stir until homogeneous at room temperature. Then weigh 5g of silica and add it to the above raw materials in batches, stirring until homogeneous. Heat the mixture to 120℃ and stir thoroughly for 4 hours, then allow it to cool naturally to room temperature to obtain the base compound. Weigh 15g of the base compound, add 2.0g of hydrogen-containing silicone oil (with a hydrogen content of 1.18%) as a crosslinking agent, stir until homogeneous, and dissolve in 60g of dichloromethane solvent to obtain the spinning agent. Spinning solution A: Weigh 15g of the base rubber compound again, add 20μL of platinum catalyst (platinum content 3000ppm), stir evenly, and dissolve in 60g of dichloromethane solvent to obtain spinning solution B. Take the above spinning solutions A and B and perform dual-channel high-voltage electrospinning in two different spinning channels a and b. The voltage in channels a and b is kept consistent at 12kV, the injection speed is consistent at 10mL / min, and the receiving distance is consistent at 15cm. The finished silicone rubber product is obtained at the receiving end. The tensile strength of the silicone rubber is 2.3MPa, the elongation at break is 221%, and the tear strength is 2.87kN / m.

[0021] Example 3

[0022] Weigh 100g of vinyl silicone oil with a viscosity of 5000 mPa·s, 6g of hexamethyldisilazane, and 4g of deionized water, and stir until homogeneous at room temperature. Then weigh 10g of silica and add it to the above raw materials in batches, stirring until homogeneous. Heat the mixture to 130℃ and stir thoroughly for 4 hours, then allow it to cool naturally to room temperature to obtain the base compound. Weigh 15g of the base compound, add 2.5g of hydrogen-containing silicone oil (with a hydrogen content of 1.18%) as a crosslinking agent, stir until homogeneous, and dissolve in 60g of dichloromethane solvent to obtain the spinning agent. Spinning solution A: Weigh 15g of the base rubber compound again, add 30μL of platinum catalyst (platinum content 3000ppm), stir evenly, and dissolve in 60g of dichloromethane solvent to obtain spinning solution B. Take the above spinning solutions A and B and perform dual-channel high-voltage electrospinning in two different spinning channels a and b. The voltage in channels a and b is kept consistent at 12kV, the injection speed is consistent at 10mL / min, and the receiving distance is consistent at 15cm. The finished silicone rubber product is obtained at the receiving end. The tensile strength of the silicone rubber is 2.2MPa, the elongation at break is 201%, and the tear strength is 2.11kN / m.

[0023] Example 4

[0024] Weigh 100g of vinyl silicone oil with a viscosity of 8000mPa·s, 6g of hexamethyldisilazane, and 3g of deionized water, and stir evenly at room temperature. Then weigh 5g of silica and add it to the above raw materials in batches. After stirring evenly, heat to 120℃ and stir thoroughly for 4 hours. Then cool naturally to room temperature to obtain the base rubber compound for later use. Weigh 10g of the base rubber compound, add 2g of hydrogen-containing silicone oil with a hydrogen content of 1.18%, stir evenly, and dissolve in 60g of dichloromethane solvent to obtain spinning solution A. Weigh 15g of the base rubber compound again, add 30μL of platinum catalyst with a platinum content of 3000ppm, stir evenly, and dissolve in 60g of dichloromethane solvent to obtain spinning solution B. Take the above spinning solutions A and B and perform dual-channel high-voltage electrospinning in two different spinning channels a and b. The voltage of channels a and b is kept consistent at 12kV, the injection speed is consistent at 15mL / min, and the receiving distance is consistent at 15cm. The finished silicone rubber product is obtained at the receiving end. The silicone rubber has a tensile strength of 1.8 MPa, an elongation at break of 112%, and a tear strength of 1.87 kN / m.

[0025] Example 5

[0026] Weigh 100g of vinyl silicone oil with a viscosity of 8000mPa·s, 6g of hexamethyldisilazane, and 3g of deionized water, and stir until homogeneous at room temperature. Then weigh 10g of silica and add it to the above raw materials in batches, stirring until homogeneous. Heat the mixture to 120℃ and stir thoroughly for 4 hours, then allow it to cool naturally to room temperature to obtain the base compound. Weigh 15g of the base compound, add 2.0g of hydrogen-containing silicone oil (1.18% hydrogen content) as a crosslinking agent, stir until homogeneous, and dissolve in 40g of dichloromethane solvent to obtain the spinning... Spinning solution A: Weigh 10g of the base rubber compound again, add 30μL of platinum catalyst (platinum content 3000ppm), stir evenly, and dissolve in 40g of dichloromethane solvent to obtain spinning solution B. Take the above spinning solutions A and B and perform dual-channel high-voltage electrospinning in two different spinning channels a and b. The voltage in channels a and b is kept consistent at 12kV, the injection speed is consistent at 10mL / min, and the receiving distance is consistent at 15cm. The finished silicone rubber product is obtained at the receiving end. The tensile strength of the silicone rubber is 2.9MPa, the elongation at break is 289%, and the tear strength is 3.53kN / m.

Claims

1. A method for electrospinning two-component silicone rubber, characterized in that, Includes the following steps: Step 1: Knead vinyl silicone oil, hexamethyldisilazane, water, and silica in a kneader at 120-150℃ and then let it cool naturally to obtain the base rubber for silicone rubber spinning. The mass parts of each raw material are 100 parts vinyl silicone oil with a viscosity of 4000-10000 mPa·s, 4-8 parts hexamethyldisilazane, 2-4 parts deionized water, and 5-15 parts silica. Step 2: The raw materials for preparing silicone rubber are divided into two components, A and B. A certain amount of the base rubber of component A is dissolved in an organic solvent, and an appropriate amount of crosslinking agent is added to prepare spinning solution A. A certain amount of the base rubber of component B is dissolved in an organic solvent, and an appropriate amount of catalyst is added to prepare spinning solution B. The concentration of spinning solution A and spinning solution B is 15%-50%. The crosslinking agent is hydrogen-containing silicone oil, and the amount of crosslinking agent added is 10%-20%, with a hydrogen content of 1%-2%. The catalyst is a platinum-based catalyst, and the amount of catalyst added is 5000-8000 ppm, with a platinum content of 3000 ppm. Step 3: Take the spinning solutions of components A and B from Step 2 and perform dual-channel high-voltage electrospinning in two different a and b spinning channels to prepare silicone rubber. In the dual-channel high-voltage electrospinning, the voltage of channels a and b is kept consistent at 12-15kV, the injection speed is consistent at 10-20mL / min, and the receiving distance is consistent at 10-20cm. The electrospinning temperature is 60-80℃ and the humidity is 20-50% during the high-voltage electrospinning process.

2. The electrospinning method for a two-component silicone rubber according to claim 1, characterized in that, The organic solvent mentioned in step two is dichloromethane, dichloroethane, or acetone.

3. The electrospinning method for a two-component silicone rubber according to claim 1, characterized in that, The spinning solution A and spinning solution B mentioned in step two may have equal or unequal concentrations.