Release agent for carbon fiber composite material workpiece and preparation process of release agent

Abstract

The invention discloses a release agent for a carbon fiber composite material workpiece, and the release agent is prepared from the following raw materials in parts by weight: 5-8 parts of organic silicon modified epoxy resin, 2-5 parts of silicone oil, 0.1-1 part of an emulsifier, 1-2 parts of a defoaming agent, 1-2 parts of a dispersing agent, 3-5 parts of a stabilizer and 50-80 parts of an ionic aqueous solution. The invention also discloses a preparation process of the release agent for the carbon fiber composite material workpiece. The organic silicon resin is modified, and the polymethylphenylsiloxane and the interface modifier are added, so that the release agent is more uniform, the interface strength of the release agent is higher, the ductility and compactness of the release agent are increased, the release times of the release agent are increased, and the quality of the release agent is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of production and preparation of a demoulding agent, and more specifically to a demoulding agent for a carbon fiber composite material workpiece and a preparation process thereof. Background Art

[0002] Release agents are used to prevent the formed composite products from sticking to the mold. A kind of isolation film is applied between the product and the mold so that the product can be easily removed from the mold while ensuring the surface quality of the product and the mold is intact. Release agents can be divided into film type (mainly polyester, polyethylene, polyvinyl chloride, cellophane, fluoroplastic film), solution type (mainly hydrocarbons, alcohols, carboxylic acids and carboxylic acid esters, metal salts of carboxylic acids, ketones, amides and halogenated hydrocarbons), paste and wax type (including silicone esters, HK-50 heat-resistant paste, cylinder oil, gasoline and asphalt solutions and wax type) release agents according to different states.

[0003] Chinese patent: A water-based demolding agent for resin-based carbon fiber composite material workpieces and a preparation method thereof, application publication number: CN114672367A. The patent document discloses an existing demolding agent and a preparation method thereof. From the above disclosed patent content, it can be seen that the demolding agent of this scheme is made of modified silicone resin and emulsified in silicone oil. It is not only low-cost, but also can achieve multiple demolding. The surface after demolding is bright and clean, and the demolding effect is excellent.

[0004] This technical solution is based on the existing technology and further optimizes and improves the existing production process and formulated raw materials. By modifying the silicone resin and adding polymethylphenylsiloxane and an interface modifier, not only can the release agent be made more uniform, but also the interface strength of the release agent is made higher, thereby increasing the ductility and density of the release agent, and increasing the number of release times of the release agent, effectively improving the quality of the release agent. Summary of the invention

[0005] The invention discloses a demoulding agent for a carbon fiber composite material workpiece and a preparation process thereof, the main purpose of which is to overcome the above-mentioned deficiencies and disadvantages of the prior art.

[0006] The technical solution adopted by the present invention is as follows: A release agent for a carbon fiber composite material workpiece is prepared from the following raw materials, which are composed of 5-8 parts of organic silicon modified epoxy resin, 2-5 parts of silicone oil, 0.1-1 part of emulsifier, 1-2 parts of defoamer, 1-2 parts of diffusant, 3-5 parts of stabilizer and 50-80 parts of ion aqueous solution in proportion by weight.

[0007] A preparation process of a release agent for a carbon fiber composite material workpiece, the preparation process comprising the following specific steps: Step 1: Preparation of silicone-modified epoxy resin: Add 10-20 parts of epoxy resin and 1-3 parts of active diluent in a weight ratio into a dispersion kettle, heat and stir evenly for 15-25 minutes, then add 3-5 parts of polymethylphenylsiloxane and 0.1-0.5 parts of interface modifier, continue to stir evenly for 20-30 minutes, cool to room temperature, add 1-3 parts of fixative, and continue to stir evenly for 10 minutes to obtain silicone-modified epoxy resin; Step 2: Preparation of mixed solution: 50-80 parts of ion aqueous solution, 5-8 parts of organosilicon modified epoxy resin, 1-2 parts of diffusing agent and 3-5 parts of stabilizer are mixed and heated to obtain a mixed solution; Step 3: Emulsification of the mixed solution: Add the mixed solution and 0.1-1 part of the emulsifier into a high-pressure heating mixer for high-pressure heating at a temperature of 80-90° C. to obtain a mixed emulsion; Step 4: Mix, cool and dilute: Add 1-2 parts of defoamer and 3-5 parts of stabilizer to the mixed emulsion at room temperature and pressure, then stir and mix, let stand and cool to obtain a cooled mixed liquid, then add 10-20 parts of ionized water to the cooled mixed liquid, stir evenly to obtain a diluted release agent.

[0008] Furthermore, the active diluent in step 1 is at least one of ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, phenyl glycidyl ether or benzyl glycidyl ether.

[0009] Furthermore, the interface modifier in step 1 is a core-shell structured polymer particle, the shell layer of the polymer particle has an amino or carboxyl group for cross-linking reaction with the epoxy group of the epoxy resin.

[0010] Furthermore, the fixing agent in step 1 is one or more solid aromatic amine fixing agents.

[0011] Furthermore, the high pressure heating in step three is a heating temperature of 80-90°C under 3 atmospheres.

[0012] Furthermore, the stirring rate of step 4 is 500-700r / min.

[0013] It can be seen from the above description and explanation of the present invention that, compared with the prior art, the advantages of the present invention are: The present invention performs organosilicon modification on epoxy resin and adds polymethylphenylsiloxane and an interface modifier, which can not only make the release agent more uniform, but also make the interface strength of the release agent higher, thereby increasing the ductility and density of the release agent, and increasing the number of release times of the release agent, thereby effectively improving the quality of the release agent. DETAILED DESCRIPTION

[0014] The present invention is described and illustrated in detail below with reference to specific embodiments.

[0015] Embodiment 1: A release agent for a carbon fiber composite material workpiece, the release agent is prepared from the following raw materials, the raw materials being in the following weight ratio: 5 parts of silicone-modified epoxy resin, 2 parts of silicone oil, 0.1 parts of emulsifier, 1 part of defoaming agent, 1 part of diffusing agent, 3 parts of stabilizer, and 50 parts of ion aqueous solution.

[0016] A preparation process of a release agent for a carbon fiber composite material workpiece, the preparation process comprising the following specific steps: Step 1: Preparation of organosilicon-modified epoxy resin: add 10 parts of epoxy resin and 1 part of active diluent in a weight ratio to a dispersion kettle, heat and stir evenly for 15-25 minutes, the active diluent is at least one of ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, phenyl glycidyl ether or benzyl glycidyl ether, then add 3 parts of polymethylphenylsiloxane and 0.1 parts of interface modifier, continue to stir evenly for 20-30 minutes, the interface modifier is a core-shell structured polymer particle, the shell layer of the polymer particle has an amino or carboxyl group, which is used to react with the epoxy group of the epoxy resin by cross-linking, after cooling to room temperature, add 1-3 parts of a fixing agent, the fixing agent is one or more solid aromatic amine fixing agents, and continue to stir evenly for 10 minutes to obtain an organosilicon-modified epoxy resin; Step 2: Preparation of mixed solution: 50 parts of ion aqueous solution, 5 parts of organosilicon-modified epoxy resin, 1 part of diffusing agent and 3 parts of stabilizer are mixed and heated to obtain a mixed solution; Step 3: Emulsification of the mixed solution: Add the mixed solution and 0.1 parts of the emulsifier into a high-pressure heating mixer for high-pressure heating at a temperature of 80-90° C. to obtain a mixed emulsion, wherein the high-pressure heating is a heating temperature of 80-90° C. under 3 atmospheres; Step 4: Mix, cool and dilute: Add 1 part of defoamer and 3 parts of stabilizer to the mixed emulsion at room temperature and pressure, then stir and mix, let stand and cool to obtain a cooled mixed liquid, then add 10 parts of ionized water to the cooled mixed liquid, stir evenly at a stirring rate of 500-700r / min to obtain a diluted release agent.

[0017] Example 2: A release agent for a carbon fiber composite material workpiece, the release agent is prepared from the following raw materials, the raw materials being in the following weight proportions: 8 parts of silicone-modified epoxy resin, 5 parts of silicone oil, 1 part of emulsifier, 2 parts of defoaming agent, 2 parts of diffusant, 5 parts of stabilizer, and 80 parts of ion aqueous solution.

[0018] A preparation process of a release agent for a carbon fiber composite material workpiece, the preparation process comprising the following specific steps: Step 1: Preparation of organosilicon-modified epoxy resin: add 20 parts of epoxy resin and 3 parts of active diluent in a weight ratio into a dispersion kettle, heat and stir evenly for 15-25 minutes, the active diluent is at least one of ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, phenyl glycidyl ether or benzyl glycidyl ether, then add 5 parts of polymethylphenylsiloxane and 0.5 parts of interface modifier, continue to stir evenly for 20-30 minutes, the interface modifier is a core-shell structured polymer particle, the shell layer of the polymer particle has an amino or carboxyl group, which is used to react with the epoxy group of the epoxy resin by cross-linking, after cooling to room temperature, add 3 parts of a fixing agent, the fixing agent is one or more solid aromatic amine fixing agents, and continue to stir evenly for 10 minutes to obtain an organosilicon-modified epoxy resin; Step 2: Preparation of mixed solution: 80 parts of ion aqueous solution, 8 parts of organosilicon-modified epoxy resin, 2 parts of diffusing agent and 5 parts of stabilizer are mixed and heated to obtain a mixed solution; Step 3: Emulsification of the mixed solution: Add the mixed solution and 1 part of the emulsifier into a high-pressure heating mixer for high-pressure heating at a temperature of 80-90° C. to obtain a mixed emulsion, wherein the high-pressure heating is performed at a heating temperature of 80-90° C. under 3 atmospheres; Step 4: Mix, cool and dilute: Add 2 parts of defoamer and 5 parts of stabilizer to the mixed emulsion at room temperature and pressure, then stir and mix, let stand and cool to obtain a cooled mixed liquid, then add 20 parts of ionized water to the cooled mixed liquid, stir evenly at a stirring rate of 500-700r / min to obtain a diluted release agent.

[0019] The present invention performs organosilicon modification on epoxy resin and adds polymethylphenylsiloxane and an interface modifier, which can not only make the release agent more uniform, but also make the interface strength of the release agent higher, thereby increasing the ductility and density of the release agent, and increasing the number of release times of the release agent, thereby effectively improving the quality of the release agent.

[0020] The above is only a specific implementation of the present invention, but the design concept of the present invention is not limited to this. Any non-substantial improvement of the present invention using this concept should be regarded as an infringement of the protection scope of the present invention.

Claims

1. A release agent for a carbon fiber composite material workpiece, characterized in that: The release agent is prepared from the following raw materials, which are in the following weight proportions: 5-8 parts of organosilicon-modified epoxy resin, 2-5 parts of silicone oil, 0.1-1 parts of emulsifier, 1-2 parts of defoamer, 1-2 parts of diffusant, 3-5 parts of stabilizer, and 50-80 parts of ion aqueous solution.

2. The process for preparing a release agent for a carbon fiber composite material workpiece according to claim 1, characterized in that: The preparation process comprises the following specific steps: Step 1: Preparation of silicone-modified epoxy resin: Add 10-20 parts of epoxy resin and 1-3 parts of active diluent in a weight ratio into a dispersion kettle, heat and stir evenly for 15-25 minutes, then add 3-5 parts of polymethylphenylsiloxane and 0.1-0.5 parts of interface modifier, continue to stir evenly for 20-30 minutes, cool to room temperature, add 1-3 parts of fixative, and continue to stir evenly for 10 minutes to obtain silicone-modified epoxy resin; Step 2: Preparation of mixed solution: 50-80 parts of ion aqueous solution, 5-8 parts of organosilicon modified epoxy resin, 1-2 parts of diffusing agent and 3-5 parts of stabilizer are mixed and heated to obtain a mixed solution; Step 3: Emulsification of the mixed solution: Add the mixed solution and 0.1-1 part of the emulsifier into a high-pressure heating mixer for high-pressure heating at a temperature of 80-90° C. to obtain a mixed emulsion; Step 4: Mix, cool and dilute: Add 1-2 parts of defoamer and 3-5 parts of stabilizer to the mixed emulsion at room temperature and pressure, then stir and mix, let stand and cool to obtain a cooled mixed liquid, then add 10-20 parts of ionized water to the cooled mixed liquid, stir evenly to obtain a diluted release agent.

3. The process for preparing a release agent for a carbon fiber composite material workpiece according to claim 2, characterized in that: The active diluent in step 1 is at least one of ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, phenyl glycidyl ether or benzyl glycidyl ether.

4. The process for preparing a release agent for a carbon fiber composite material workpiece according to claim 2, characterized in that: The interface modifier in step 1 is a core-shell structured polymer particle, the shell layer of the polymer particle has an amino or carboxyl group for cross-linking reaction with the epoxy group of the epoxy resin.

5. The process for preparing a release agent for a carbon fiber composite material workpiece according to claim 2, characterized in that: The fixing agent in step 1 is one or more solid aromatic amine fixing agents.

6. The process for preparing a release agent for a carbon fiber composite material workpiece according to claim 2, characterized in that: The high pressure heating in step 3 is a heating temperature of 80-90° C. under 3 atmospheres.

7. The process for preparing a release agent for a carbon fiber composite material workpiece according to claim 2, characterized in that: The stirring rate of step 4 is 500-700r / min.