Lubricating release agent and preparation method thereof

Abstract

The invention relates to the technical field of release agents, and discloses a lubricating release agent which comprises the following components: 10-13 parts of graphite, 5-8 parts of an inorganic thickening agent and 6-9 parts of an organic dispersing agent. The invention also provides a preparation method of the lubricating release agent, which comprises the following steps: S1, mixing preparation: slowly stirring and mixing the organic dispersing agent, the inorganic dispersing agent and the inorganic thickening agent, heating to 55-65 DEG C, and keeping the temperature for 40-45 minutes to obtain mixed slurry A; according to the method, the contact angle between the coating and the liquid metal melt can be reduced, so that the non-wettability between the coating and the liquid metal is achieved, and the contact angle between the coating and the liquid metal melt can be reduced, so that the non-wettability between the coating and the liquid metal is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of mold release agents, and specifically provides a lubricating mold release agent and a preparation method thereof. Background Art

[0002] Mold release agents are indispensable auxiliary materials in casting production. Improper selection and use methods of mold release agents directly or indirectly affect the quality and production efficiency of die-castings, and also have a relatively bad impact on the production environment.

[0003] A mold release agent is a layer of isolation film applied between the casting and the mold, which prevents the formed casting from sticking to the mold, enables the liquid metal to fill smoothly, so that the casting can be easily removed from the mold, and at the same time ensures the surface quality of the casting and the integrity of the mold.

[0004] In the process of high-end aluminum alloy melting and casting, a lubricating mold release coating material is used to protect the workpiece in contact with the high-temperature melt. However, the existing lubricating mold release coating materials often have a wetting phenomenon with the metal liquid, so that the components of the coating material penetrate into the liquid metal melt, causing pollution of the metal melt; due to the relatively high viscosity of the aluminum metal melt, it often adheres to the surface of the coating, resulting in excessive residue of aluminum metal. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides a lubricating mold release agent and a preparation method thereof, mainly to solve the problems that the existing lubricating mold release coating materials often have a wetting phenomenon with the metal liquid, so that the components of the coating material penetrate into the liquid metal melt, causing pollution of the metal melt; due to the relatively high viscosity of the aluminum metal melt, it often adheres to the surface of the coating, resulting in excessive residue of aluminum metal.

[0006] To achieve the above object, the present invention provides the following technical solutions: A lubricating mold release agent, comprising the following components: 10 - 13 parts of graphite, 5 - 8 parts of inorganic thickener, 6 - 9 parts of organic dispersant, 10 - 15 parts of inorganic dispersant, 3 - 6 parts of filler, and 7 - 8 parts of binder.

[0007] Further, the graphite is any one of natural flake graphite, earthy graphite, and artificial graphite, and the organic dispersant is any one of polyvinyl alcohol, fatty alcohol polyoxyethylene ether, sodium carboxymethyl cellulose, sodium lignosulfonate, and Span - 80.

[0008] On the basis of the foregoing solution, the inorganic dispersant is any one of sepiolite, mica, diatomaceous earth, and magnesium silicate, and the inorganic thickener is any one of montmorillonite and sodium - based bentonite.

[0009] As a further solution of the present invention, the binder is any one or more of boron-modified silica sol, polyaluminum phosphate, and polyaluminum chloride.

[0010] Further, the filler is any one of cubic boron nitride, diamond micropowder, carbon black, silica, and pyrophyllite.

[0011] The present invention also provides a method for preparing a lubricating release agent, comprising the following steps: S1: Mixing and preparation. Slowly stir and mix the organic dispersant, inorganic dispersant, and inorganic thickener, and heat up to 55 - 65 °C. After maintaining the temperature for 40 - 45 minutes, a mixed slurry A is obtained. S2: Secondary mixing. Put the binder into the mixed slurry A in S1, stir evenly and heat to 55 - 60 °C, and maintain the temperature at 20 - 25 °C for 30 - 40 minutes to obtain a mixed slurry B. S3: Grinding. First, coarsely crush graphite and the filler through a hammer mill for the first stage. The crushed graphite and filler are then moderately ground through a Raymond mill for the second stage, and finally ultrasonically finely ground through an ultrasonic mill to obtain graphite powder and filler powder. S4: Raw material mixing. Add the graphite powder and filler powder in S3 to the mixed slurry B in S2 in sequence, and stir for 30 - 45 minutes to obtain a mixed slurry C. S5: Secondary grinding. Grind the mixed slurry C in S4 through an ultrasonic mill to obtain a lubricating release agent.

[0012] Further, the particle sizes of the organic dispersant, inorganic dispersant, and inorganic thickener are all 0.5 - 1 mm.

[0013] On the basis of the foregoing solution, the particle sizes of the graphite powder and filler powder in S3 are 0.03 - 0.1 mm.

[0014] Compared with the prior art, the beneficial technical effects of the present invention are as follows: (1) The lubricating release agent prepared by the present invention can reduce the contact angle between the coating and the liquid metal melt, thereby achieving non-wetting between the coating and the liquid metal. Moreover, it can also achieve the anti-adhesion property of the lubricating release agent, effectively protect the workpiece, not pollute the metal melt, and reduce the metal residue on the surface of the workpiece.

[0015] (2) The release agent of the present invention not only has good lubricating and releasing performance, but also has the characteristics of low cost, environmental protection, and resource recycling. And this release agent has low cost and a simple preparation process.

[0016] (3) The mold release agent in the present invention has good lubricating and demolding properties, and at the same time has the advantages of not decomposing at high temperatures, being easy to demold, the castings being smooth and flat, smokeless, fireless, odorless, and dust-free during the casting process, reducing mold wear, and delaying the mold life.

[0017] (4) The mold release agent of the present invention has heat resistance, does not undergo carbonization decomposition when heated, has stable chemical properties, does not chemically react with the molded product, does not affect the secondary processing performance of plastics, and the mold release agent does not corrode the mold, does not contaminate the product, has a small odor and toxicity, and has a smooth and beautiful appearance, is easy to coat, and has high production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic flow structure diagram of a preparation method of a lubricating mold release agent proposed by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] Embodiment 1 Referring to Figure 1 , a lubricating mold release agent includes the following components: 10 parts of graphite, 5 parts of inorganic thickener, 6 parts of organic dispersant, 10 parts of inorganic dispersant, 3 parts of filler, and 7 parts of binder.

[0021] In the present invention, the graphite is artificial graphite, the organic dispersant is sodium lignosulfonate, the inorganic dispersant is diatomaceous earth, the inorganic thickener is montmorillonite, the binder is boron-modified silica sol and polyaluminum chloride, and the filler is silica. The mold release agent of the present invention not only has good lubricating and demolding properties, but also has the characteristics of low cost, environmental protection, and resource recycling. And this mold release agent has low cost, simple preparation process, good lubricating and demolding properties, and at the same time has the advantages of not decomposing at high temperatures, being easy to demold, the castings being smooth and flat, smokeless, fireless, odorless, and dust-free during the casting process, reducing mold wear, and delaying the mold life.

[0022] The present invention also proposes a preparation method of a lubricating mold release agent, including the following steps: S1: Mixing and preparation, slowly stirring and mixing the organic dispersant, inorganic dispersant, and inorganic thickener, and heating to 65 °C. After keeping the temperature constant for 40 min, a mixed slurry A is obtained; S2: Secondary mixing. Put the binder into the mixed slurry A obtained in step S1, stir evenly and heat to 55°C, and keep it at a constant temperature of 25°C for 30 minutes to obtain the mixed slurry B. S3: Grinding. First, coarsely crush the graphite and filler through a hammer mill for the first stage. After crushing, the graphite and filler are moderately ground in the second stage by a Raymond mill, and finally, ultrasonically finely ground in the third stage by an ultrasonic crusher to obtain graphite powder and filler powder. Through multi-stage grinding, the graphite and filler can be finely ground, thereby improving the grinding accuracy and uniformity of the graphite and filler. S4: Raw material mixing. Add the graphite powder and filler powder obtained in step S3 to the mixed slurry B in S2 in sequence, and stir for 30 minutes to obtain the mixed slurry C. S5: Secondary grinding. Grind the mixed slurry C in S4 with an ultrasonic crusher to obtain a lubricating release agent. The prepared lubricating release agent can reduce the contact angle between the coating and the liquid metal melt, thereby achieving the non-wetting property between the coating and the liquid metal. Moreover, it can also achieve the anti-adhesion property of the lubricating release agent, effectively protect the workpiece, not pollute the metal melt, and reduce the metal residue on the surface of the workpiece. At the same time, it has heat resistance, does not undergo carbonization decomposition when heated, has stable chemical properties, does not react chemically with the molded product, does not affect the secondary processing performance of the plastic, and the release agent does not corrode the mold, does not pollute the product, has small odor and toxicity, and has a smooth and beautiful appearance, is easy to coat, and has high production efficiency.

[0023] In particular, the particle sizes of the organic dispersant, inorganic dispersant, and inorganic thickener are all 0.5 mm, and the particle sizes of the graphite powder and filler powder in S3 are 0.03 mm.

[0024] Example 2 Refer to Figure 1 , a lubricating release agent, comprising the following components: 12 parts of graphite, 6 parts of inorganic thickener, 8 parts of organic dispersant, 12 parts of inorganic dispersant, 5 parts of filler, and 7 parts of binder.

[0025] In the present invention, the graphite is: earthy graphite, the organic dispersant is: fatty alcohol polyoxyethylene ether, the inorganic dispersant is: mica, the inorganic thickener is: sodium-based bentonite, the binder is: polymeric aluminum phosphate and polymeric aluminum chloride, and the filler is: diamond micropowder. The release agent of the present invention not only has good lubricating and releasing performance, but also has the characteristics of low cost, environmental protection, and resource recycling. Moreover, the release agent has low cost, simple preparation process, good lubricating and releasing performance, does not decompose at high temperature, is easy to release, the castings are smooth and flat, smokeless, fireless, odorless, and dust-free during the casting process, reduces mold wear, and extends the mold life.

[0026] The present invention also provides a method for preparing a lubricating release agent, comprising the following steps: S1: Mixing and preparing: Slowly stir and mix the organic dispersant, inorganic dispersant and inorganic thickener, heat up to 60 °C, and keep the temperature constant for 42 min to obtain the mixed slurry A; S2: Secondary mixing: Put the binder into the mixed slurry A in S1, stir evenly and heat to 58 °C, and keep the temperature constant at 22 °C for 35 min to obtain the mixed slurry B; S3: Grinding: Coarsely crush the graphite and filler through a hammer mill in sequence. After crushing, the graphite and filler are moderately ground at the secondary level by a Raymond mill, and finally ultrasonically and finely ground at the tertiary level by an ultrasonic crusher to obtain graphite powder and filler powder. Through multi-level grinding, the graphite and filler can be finely ground, thereby improving the grinding accuracy and uniformity of the graphite and filler; S4: Raw material mixing: Sequentially add the graphite powder and filler powder in S3 into the mixed slurry B in S2, stir for 35 min to obtain the mixed slurry C; S5: Secondary grinding: Grind the mixed slurry C in S4 by an ultrasonic crusher to obtain the lubricating release agent. The prepared lubricating release agent can reduce the contact angle between the coating and the liquid metal melt, thereby realizing the non-wetting property between the coating and the liquid metal. Moreover, it can also realize the anti-adhesion property of the lubricating release agent, effectively protect the workpiece, not pollute the metal melt, reduce the metal residue on the surface of the workpiece, and at the same time has heat resistance, does not undergo carbonization decomposition when heated, has stable chemical properties, does not react chemically with the molded product, does not affect the secondary processing performance of the plastic, and the release agent does not corrode the mold, does not pollute the product, has little odor and toxicity, and has a smooth and beautiful appearance, is easy to coat, and has high production efficiency.

[0027] In particular, the particle sizes of the organic dispersant, inorganic dispersant and inorganic thickener are all 0.7 mm, and the particle sizes of the graphite powder and filler powder in S3 are 0.08 mm.

[0028] Example 3 Refer to Figure 1 , a lubricating release agent, comprising the following components: 13 parts of graphite, 8 parts of inorganic thickener, 9 parts of organic dispersant, 15 parts of inorganic dispersant, 6 parts of filler and 8 parts of binder.

[0029] In the present invention, the graphite is natural flake graphite, the organic dispersant is polyvinyl alcohol, the inorganic dispersant is sepiolite, the inorganic thickener is montmorillonite, the binder is boron-modified silica sol and polymeric aluminum phosphate, and the filler is cubic boron nitride. The release agent of the present invention not only has good lubricating and demolding performance, but also has the characteristics of low cost, environmental protection and resource recycling. Moreover, the release agent is inexpensive, has a simple preparation process, and also has good lubricating and demolding performance. It does not decompose at high temperatures, is easy to demold, the castings are smooth and flat, there is no smoke, fire, odor or dust during the casting process, it reduces mold wear and extends the mold life.

[0030] The present invention also provides a method for preparing a lubricating release agent, which includes the following steps: S1: Mixing and preparation. Slowly stir and mix the organic dispersant, inorganic dispersant and inorganic thickener, and heat up to 55°C. After keeping the temperature constant for 45 minutes, a mixed slurry A is obtained. S2: Secondary mixing. Put the binder into the mixed slurry A in S1, stir evenly and heat to 60°C, and keep the temperature constant at 25°C for 30 minutes to obtain a mixed slurry B. S3: Grinding. The graphite and the filler are successively subjected to primary coarse grinding by a hammer mill. After grinding, the graphite and the filler are subjected to secondary medium grinding by a Raymond mill, and finally ultrasonic tertiary fine grinding is carried out by an ultrasonic mill to obtain graphite powder and filler powder. Through multi-stage grinding, the graphite and the filler can be finely ground, thereby improving the grinding accuracy and uniformity of the graphite and the filler. S4: Raw material mixing. Add the graphite powder and the filler powder in S3 into the mixed slurry B in S2 in sequence, and stir for 45 minutes to obtain a mixed slurry C. S5: Secondary grinding. Subject the mixed slurry C in S4 to ultrasonic grinding by an ultrasonic mill to obtain a lubricating release agent. The prepared lubricating release agent can reduce the contact angle between the coating and the liquid metal melt, thereby realizing the non-wetting property between the coating and the liquid metal. Moreover, it can also realize the anti-adhesion property of the lubricating release agent, effectively protect the workpiece, do not pollute the metal melt, reduce the metal residue on the surface of the workpiece, and at the same time has heat resistance, does not undergo carbonization decomposition when heated, has stable chemical properties, does not react chemically with the molded product, does not affect the secondary processing performance of the plastic, and the release agent does not corrode the mold, does not pollute the product, has small odor and toxicity, and has a smooth and beautiful appearance, is easy to coat, and has high production efficiency.

[0031] In particular, the particle sizes of the organic dispersant, inorganic dispersant and inorganic thickener are all 1 mm, and the particle sizes of the graphite powder and the filler powder in S3 are 0.1 mm.

[0032] In the description in this article, it should be noted that relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device.

Claims

1. A lubricating release agent, characterized in that, It includes the following components: 10 - 13 parts of graphite, 5 - 8 parts of inorganic thickener, 6 - 9 parts of organic dispersant, 10 - 15 parts of inorganic dispersant, 3 - 6 parts of filler, and 7 - 8 parts of binder.

2. The lubricating release agent according to claim 1, characterized in that, The graphite is any one of natural flake graphite, earthy graphite, and artificial graphite. The organic dispersant is any one of polyvinyl alcohol, fatty alcohol polyoxyethylene ether, sodium carboxymethyl cellulose, sodium lignosulfonate, and Span - 80.

3. A lubricating release agent according to claim 2, wherein The inorganic dispersant is any one of sepiolite, mica, diatomite, and magnesium silicate. The inorganic thickener is any one of montmorillonite and sodium - based bentonite.

4. A lubricating demoulding agent according to claim 3, characterized in that, The binder is any one or more of boron - modified silica sol, polymeric aluminum phosphate, and polymeric aluminum chloride.

5. A lubricating release agent according to claim 4, characterized in that, The filler is any one of cubic boron nitride, diamond micropowder, carbon black, silicon dioxide, and pyrophyllite.

6. A preparation method of a lubricating release agent, characterized in that, It includes the following steps: S1: Mixing and preparation. Slowly stir - mix the organic dispersant, inorganic dispersant, and inorganic thickener, and heat up to 55 - 65 °C. After keeping the temperature constant for 40 - 45 min, obtain the mixed slurry A. S2: Secondary mixing. Put the binder into the mixed slurry A in S1, stir evenly and heat to 55 - 60 °C, and keep the temperature constant at 20 - 25 °C for 30 - 40 min to obtain the mixed slurry B. S3: Grinding. Coarsely crush the graphite and filler through a hammer mill in sequence for the first - stage coarse crushing. After crushing, the graphite and filler are moderately ground through a Raymond mill for the second - stage, and finally ultrasonically and finely ground through an ultrasonic crusher for the third - stage to obtain graphite powder and filler powder. S4: Raw material mixing. Add the graphite powder and filler powder in S3 into the mixed slurry B in S2 in sequence, and stir for 30 - 45 min to obtain the mixed slurry C. S5: Secondary grinding. Grind the mixed slurry C in S4 through an ultrasonic crusher to obtain the lubricating demoulding agent.

7. The preparation method of a lubricating release agent according to claim 6, characterized in that, The particle sizes of the organic dispersant, inorganic dispersant, and inorganic thickener are all 0.5 - 1 mm.

8. A method for preparing a lubricating mold release agent according to claim 7, characterized in that, The particle sizes of the graphite powder and filler powder in S3 are 0.03 - 0.1 mm.

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