A sand blasting mortar, its preparation method and application

Abstract

The application belongs to the technical field of slurry preparation, and particularly relates to a sand blasting slurry, a preparation method and application thereof. The method comprises the following steps: S1: preparing a pretreatment slurry: adding hard abrasive sand 80-100 parts and a diluent 80-120 parts into a starch mixed slurry to obtain the pretreatment slurry; S2: performing secondary treatment on the pretreatment slurry; S3: primary mixing; S4: secondary mixing; S5: pasting the finished slurry, diluting the slurry with water as a diluent, measuring the viscosity through a viscometer, and obtaining a wet sand blasting machine sand blasting slurry. The sand blasting slurry prepared by the application has a certain viscosity, and can replace water-based abrasives to perform sand blasting on the surface of a part in a wet sand blasting process. The application can realize surface roughening of hard materials and reduce the cutting amount.

Description

Technical Field

[0001] This invention belongs to the field of slurry preparation technology, specifically relating to a sandblasting slurry, its preparation method, and its application. Background Technology

[0002] Traditional sandblasting uses a high-speed jet of abrasive to impact the surface of a part. Compressed air is typically used as the power source to create a high-speed jet that propels hard abrasive materials (steel grit, quartz sand, alumina, silicon carbide, etc.) onto the surface to be treated. The cutting action of these hard particles creates varying surface roughness. When abrasive grains collide with the surface, their sharp edges, like a cutting blade, cut through the surface before bouncing off, exposing a fresh surface. Other grains in the sandblasting jet continue to cut, removing surface material and creating a roughened surface. This cutting principle is as follows: Figure 1 As shown, it is widely used in the field of material cutting, such as sandblasting cutting, sandblasting engraving, waterjet cutting, and abrasive flow grinding.

[0003] Before preparing the thermal insulation coating for high-temperature guide vanes, the vane surface needs to be roughened by sandblasting to increase its surface roughness and improve the adhesion between the thermal insulation coating and the vane substrate. Typically, the substrate of high-temperature guide vanes has high hardness, and conventional sandblasting pressure cannot improve its roughness. For example, using 46-mesh white corundum sand at a pressure of 0.4 MPa for 3-4 passes only yields a roughness value of Ra 2.0-2.4 micrometers, which cannot meet the requirement of Ra 4-6 micrometers for subsequent coating. Furthermore, because the vanes have very strict requirements for substrate thickness, using 46-mesh white corundum sand at a pressure of 0.6 MPa for 3-4 passes yields a roughness value of Ra 4-5 micrometers. Although the roughness meets the requirements, the substrate thickness is reduced to 0.1-0.15 mm. Since the thickness of the vane substrate has strict dimensional requirements, the substrate thinning after sandblasting must be less than 0.05 mm. Summary of the Invention

[0004] To address the shortcomings of existing technologies, achieve surface roughening of harder materials, and reduce cutting amount, this invention provides a sandblasting slurry, its preparation method, and its application.

[0005] The technical solution provided by this invention is as follows:

[0006] A method for preparing a sandblasting slurry includes the following steps:

[0007] S1: Preparation of pretreated slurry: Add 80-100 parts of hard abrasive sand and 80-120 parts of diluent to starch mixed slurry to obtain pretreated slurry. The starch mixed slurry includes 15-20 parts of organic slurry, 15-20 parts of phosphate starch, 15-20 parts of oxidized starch, 15-20 parts of acid-modified starch and 15-20 parts of oxidized acetate starch. The weight ratio of starch mixed slurry to hard abrasive sand is 1.5:1 to 2:1.

[0008] S2: Secondary treatment of the pretreated slurry: According to the weight, add the following materials into the mixing tank: 30-35 parts of pretreated slurry, 3-5 parts of cement molecule secondary reaction agent, 0.7-1 part of antifreeze agent, 0.3-0.5 parts of metal ion complexing agent and 5-7 parts of antibacterial agent.

[0009] S3: Initial mixing: The materials in the mixing tank are stirred to form a primary mixture. The internal temperature of the mixing tank is 15℃~35℃, the relative humidity is 10%~15%, the rotation speed inside the reaction tank is 120~150r / min, and after stirring for 2~4 minutes, it is allowed to stand for 4~6 minutes. The process is carried out under normal pressure.

[0010] S4: Secondary mixing: The obtained primary mixture is further mixed in a stirred tank to obtain the finished slurry. The internal temperature of the stirred tank is 20℃~40℃, the relative humidity is 5%~10%, the rotation speed inside the reactor is 150~200r / min, the stirring time is 4~6 minutes, and the mixture is allowed to stand for 9~11 minutes. The process is carried out under normal pressure.

[0011] S5: The finished slurry is gelatinized, diluted with water as a diluent, and the viscosity is measured by a viscometer to obtain the wet sandblasting slurry.

[0012] In the above technical solution:

[0013] In step S1, the roles of phosphate starch, oxidized starch, acid-modified starch, and oxidized acetate starch are respectively emulsifier and thickener, freeze-thaw resistant and thickener, increase gelation and gel strength, binder and stabilizer.

[0014] In step S2, the role of the cement molecule secondary reactant is to promote the reaction so that the slurry can fully fill the gaps between the abrasive particles, and the role of the metal ion complexing agent is to promote the combination of metal ions in the slurry to form stable complexes.

[0015] In step S3, the purpose of the initial mixing is to ensure that all components are thoroughly mixed and react. The chemical reactions that occur during the initial mixing include the esterification reaction between the cement molecules, the secondary reactant, and the starch slurry.

[0016] In step S4, the secondary mixing serves to appropriately increase the temperature to reduce the viscosity of the starch slurry, promote the dissolution of the components, and ensure the reaction products are homogeneous through stirring. The chemical reactions occurring during the secondary mixing include the esterification reaction following starch dissolution.

[0017] The principle of the above technical solution is as follows:

[0018] The aforementioned technical solution is a sandblasting process that achieves high surface roughness while minimizing cutting depth. During sandblasting, it limits abrasive particle rebound and simultaneously forms a protective film on the cutting surface to prevent further cutting. This process is similar to wet sandblasting, where water and compressed air are used together as the abrasive carrier fluid. After being sprayed onto the part surface, it reduces abrasive particle rebound, causing rebounded abrasive particles and cutting debris to splash off under the action of water, thus inhibiting dust formation. Further increasing the viscosity of the wet sandblasting liquid will cause the blasted liquid to adhere to the part surface, forming a protective film that inhibits subsequent sandblasting.

[0019] Using the sandblasting slurry provided by this invention during wet sandblasting can reduce the amount of cutting and achieve a shallow surface roughening effect on the parts without reducing the thickness of the substrate.

[0020] Specifically, in step 1), the organic slurry includes, but is not limited to, starch slurry, with a solid content of 40% to 60%.

[0021] Specifically, the weight ratio of the starch slurry, phosphate starch, oxidized starch, acid-modified starch, and oxidized acetate starch is 8:1:1:1:1.

[0022] Specifically, in step 1), the diluent is water.

[0023] Specifically, in step 1), the hard abrasive sand is selected from high-purity alumina with a mesh size of 46 and a purity of 99.9% or higher. Alternatively, 24 mesh, 64 mesh, or 120 mesh can also be selected.

[0024] Preferably, in step 2), the secondary reactant for cement molecules is triethanolamine. Alternatively, polymeric polyols, glycerol, or triethylamine may also be selected.

[0025] Preferably, in step 2), the antifreeze is potassium carbonate. Alternatively, ammonium chloride, sodium chloride, or calcium chloride may also be selected.

[0026] Preferably, in step 2), the metal ion complexing agent is sodium hexametaphosphate. Alternatively, sodium tripolyphosphate, sodium pyrophosphate, or sodium aminotriacetate may also be selected.

[0027] Preferably, in step 2), the antibacterial agent is nano-silver ion powder. Alternatively, graphene antibacterial additives may also be selected.

[0028] Specifically, in step 4), the gelatinization method is to gelatinize at a high temperature of 95-98℃ for 30-35 minutes.

[0029] Specifically, in step 4): the viscosity of the diluted slurry is 2 to 10 mPa·s.

[0030] Specifically, in step 4), the viscosity of the blasting slurry can be measured using a rotational viscometer. Higher viscosity not only makes it difficult for compressed air to increase the spray jet speed and reduce the cutting force, but also results in a smaller texturing effect due to the encapsulation of hard abrasive. Lower viscosity, on the other hand, results in poor adhesion to the surface of the part and the inability to form a protective film to prevent the subsequent blasting jet from over-cutting the surface.

[0031] The present invention also provides a sandblasting slurry prepared by the above preparation method.

[0032] This invention also provides the application of the aforementioned blasting slurry as a blasting slurry for high-temperature guide vanes. Specifically, the material type of the high-temperature guide vane is K4002 nickel-based cast high-temperature alloy.

[0033] The blasting slurry provided by this invention has a certain viscosity and can replace water-based abrasives in wet blasting processes for blasting part surfaces. During blasting using this slurry, the viscosity is suitable for wet blasting, achieving a blasting jet with a certain velocity. This ensures the initial velocity of the abrasive in the slurry when contacting the part surface, enabling a cutting action on the part surface and achieving surface roughening. Simultaneously, the initial slurry reaching the part surface has a certain viscosity, which appropriately ensures the blasting slurry adheres to the part surface, protecting the blasted surface and preventing over-cutting. Furthermore, after blasting, the slurry can be washed away to measure the surface roughness and determine whether multiple blasting cycles are necessary. The principle can be referenced as follows: Figure 2 .

[0034] The present invention also has the following advantages:

[0035] This invention uses starch slurry, which is inexpensive, and the starch can be degraded, which is beneficial to environmental protection. At the same time, the starch gelatinization process only requires heating, and the process is simple and easy to control.

[0036] This invention uses high-purity alumina sand as a hard abrasive. The abrasive has high hardness and high cleanliness, which is beneficial for the surface cleaning of the roughened parts. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the sandblasting cutting principle in existing technology.

[0038] Figure 2 This is a schematic diagram illustrating the working principle of the sandblasting slurry provided by the present invention.

[0039] Figure 3 This is a flowchart of the preparation method of the sandblasting slurry provided by the present invention.

[0040] Figure 4 This is an image showing the effect of sandblasting and texturing on high-temperature guide vanes. Detailed Implementation

[0041] The principles and features of the present invention are described below. The embodiments given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0042] Example 1

[0043] Preparation of sandblasting slurry

[0044] S1: Preparation of pretreated slurry: Add 80 parts of hard abrasive sand and 80 parts of water to the starch mixture slurry to obtain the pretreated slurry. The starch mixture slurry includes 15 parts of starch slurry, 15 parts of phosphate starch (purchased from Shandong Gushuo Biotechnology Co., Ltd.), 15 parts of oxidized starch (purchased from Hangzhou Xinrui Co., Ltd.), 15 parts of acid-modified starch (purchased from Xi'an Darwen Biotechnology Co., Ltd.), and 15 parts of oxidized acetate starch (purchased from Henan Hengrui Starch Technology Co., Ltd.).

[0045] S2: Secondary treatment of the pre-treated slurry: According to the weight, add the following materials into the mixing tank: 30 parts of pre-treated slurry, 3 parts of cement molecule secondary reaction agent, 0.7 parts of antifreeze agent, 0.3 parts of metal ion complexing agent and 5 parts of antibacterial agent.

[0046] S3: Initial mixing: The materials in the mixing tank are stirred to form a primary mixture. The internal temperature of the mixing tank is 20℃, the relative humidity is 10%, the rotation speed inside the reaction tank is 120r / min, and the stirring is carried out for 3 minutes, followed by standing for 5 minutes. The process is carried out under normal pressure.

[0047] S4: Secondary mixing: The obtained primary mixture is further mixed in a stirred tank to obtain the finished slurry. The internal temperature of the stirred tank is 40℃, the relative humidity is 15%, the rotation speed inside the reactor is 150r / min, the stirring time is 5 minutes, and the mixture is allowed to stand for 10 minutes. The process is carried out under normal pressure.

[0048] S5: The finished slurry is gelatinized, diluted with water as a diluent, and the viscosity is measured by a viscometer to obtain the wet sandblasting slurry.

[0049] In step S1, the solid content of the starch slurry is 40%. The diluent is deionized water. The hard abrasive is high-purity alumina, purchased from Yancheng Chengmu Abrasive & Mold Co., Ltd.

[0050] In step S2, the secondary reactant for cement molecules is triethanolamine. The antifreeze agent is potassium carbonate. The metal ion complexing agent is sodium hexametaphosphate. The antibacterial agent is nano-silver ion powder.

[0051] In step S5, the gelatinization method is selected to be high temperature (95℃) for 30 minutes. The viscosity of the diluted slurry is approximately 4 MPa·s.

[0052] Example 2

[0053] Preparation of sandblasting slurry

[0054] S1: Preparation of pretreated slurry: Add 80 parts of hard abrasive sand and 100 parts of water to the starch mixture slurry to obtain the pretreated slurry. The starch mixture slurry includes 15 parts of starch slurry, 15 parts of phosphate starch (purchased from Shandong Gushuo Biotechnology Co., Ltd.), 15 parts of oxidized starch (purchased from Hangzhou Xinrui Co., Ltd.), 15 parts of acid-modified starch (purchased from Xi'an Darwen Biotechnology Co., Ltd.), and 15 parts of oxidized acetate starch (purchased from Henan Hengrui Starch Technology Co., Ltd.).

[0055] S2: Secondary treatment of the pre-treated slurry: According to the weight, add the following materials into the mixing tank: 30 parts of pre-treated slurry, 3 parts of cement molecule secondary reaction agent, 0.7 parts of antifreeze agent, 0.3 parts of metal ion complexing agent and 5 parts of antibacterial agent.

[0056] S3: Initial mixing: The materials in the mixing tank are stirred to form a primary mixture. The internal temperature of the mixing tank is 20℃, the relative humidity is 10%, the rotation speed inside the reaction tank is 120r / min, and the stirring is carried out for 3 minutes, followed by standing for 5 minutes. The process is carried out under normal pressure.

[0057] S4: Secondary mixing: The obtained primary mixture is further mixed in a stirred tank to obtain the finished slurry. The internal temperature of the stirred tank is 40℃, the relative humidity is 15%, the rotation speed inside the reactor is 150r / min, the stirring time is 5 minutes, and the mixture is allowed to stand for 10 minutes. The process is carried out under normal pressure.

[0058] S5: The finished slurry is gelatinized, diluted with water as a diluent, and the viscosity is measured by a viscometer to obtain the wet sandblasting slurry.

[0059] In step S1, the solid content of the starch slurry is 50%. The diluent is deionized water. The hard abrasive is high-purity alumina, purchased from Yancheng Chengmu Abrasive & Mold Co., Ltd.

[0060] In step S2, the secondary reactant for cement molecules is triethanolamine. The antifreeze agent is potassium carbonate. The metal ion complexing agent is sodium hexametaphosphate. The antibacterial agent is nano-silver ion powder.

[0061] In step S5, the gelatinization method is selected to be high temperature (95℃) for 30 minutes. The viscosity of the diluted slurry is approximately 7 MPa·s.

[0062] Example 3

[0063] Preparation of sandblasting slurry

[0064] S1: Preparation of pretreated slurry: Add 80 parts of hard abrasive sand and 120 parts of water to the starch mixture slurry. The starch mixture slurry includes 15 parts of starch slurry, 15 parts of phosphate starch (phosphate starch product purchased from Shandong Gushuo Biotechnology Co., Ltd.), 15 parts of oxidized starch (oxidized starch product purchased from Hangzhou Xinrui Co., Ltd.), 15 parts of acid-modified starch (acid-modified starch product purchased from Xi'an Darwen Biotechnology Co., Ltd.), and 15 parts of oxidized acetate starch (oxidized acetate starch product purchased from Henan Hengrui Starch Technology Co., Ltd.).

[0065] S2: Secondary treatment of the pre-treated slurry: According to the weight, add the following materials into the mixing tank: 30 parts of pre-treated slurry, 3 parts of cement molecule secondary reaction agent, 0.7 parts of antifreeze agent, 0.3 parts of metal ion complexing agent and 5 parts of antibacterial agent.

[0066] S3: Initial mixing: The materials in the mixing tank are stirred to form a primary mixture. The internal temperature of the mixing tank is 20℃, the relative humidity is 10%, the rotation speed inside the reaction tank is 120r / min, and the stirring is carried out for 3 minutes, followed by standing for 5 minutes. The process is carried out under normal pressure.

[0067] S4: Secondary mixing: The obtained primary mixture is further mixed in a stirred tank to obtain the finished slurry. The internal temperature of the stirred tank is 40℃, the relative humidity is 20%, the rotation speed inside the reactor is 150r / min, the stirring time is 5 minutes, and the mixture is allowed to stand for 10 minutes. The process is carried out under normal pressure.

[0068] S5: The finished slurry is gelatinized, diluted with water as a diluent, and the viscosity is measured by a viscometer to obtain the wet sandblasting slurry.

[0069] In step S1, the solid content of the starch slurry is 40%. The diluent is deionized water. The hard abrasive is high-purity alumina, purchased from Yancheng Chengmu Abrasive & Mold Co., Ltd.

[0070] In step S2, the secondary reactant for cement molecules is triethanolamine. The antifreeze agent is potassium carbonate. The metal ion complexing agent is sodium hexametaphosphate. The antibacterial agent is nano-silver ion powder.

[0071] In step S5, the gelatinization method is selected to be high temperature (95℃) for 30 minutes. The viscosity of the diluted slurry is approximately 3 MPa·s.

[0072] Comparative Example 1

[0073] The implementation process of this comparative example is the same as that of Example 1, except that 46-mesh white corundum sand is replaced with 24-mesh white corundum sand to obtain the blasting slurry.

[0074] The roughness properties of the sandblasting slurry obtained in Comparative Example 1 were compared after sandblasting treatment.

[0075] The specific testing method is as follows: The K4002 nickel-based high-temperature casting alloy was roughened by sandblasting using an STR series sandblasting machine manufactured by Zhangjiagang Steer Coating Equipment Co., Ltd. The sandblasting pressure was 0.5 MPa, the sandblasting distance was 150 mm, and the angle was 90°. After cleaning the sandblasted parts with compressed air, the surface roughness was measured using an SJ-210 surface roughness measuring instrument manufactured by Mitutoyo Corporation of Japan. The testing standard adopted was ISO 1997.

[0076] The test results were as follows: surface roughness value was 5.9 μm, and substrate thinning was 0.046 mm.

[0077] The results show that when using this type of slurry for sandblasting, the viscosity of the slurry is suitable for wet sandblasting, achieving a certain speed of sandblasting jet. This ensures the initial velocity of the abrasive in the slurry when contacting the part surface, enabling cutting action on the part surface and achieving surface roughening. Simultaneously, the initial slurry reaching the part surface has a certain viscosity, which appropriately ensures the sandblasting slurry adheres to the part surface, protecting the sandblasted surface and preventing over-cutting. However, compared to the wet sandblasting slurry provided in the embodiments of this invention, its effect still has some gaps.

[0078] Actual processing effect

[0079] The surface of the high-temperature guide vane of K4002 material was roughened by sandblasting using the wet sandblasting slurry of Example 1.

[0080] The specific operating conditions were as follows: A STR series sandblasting machine manufactured by Zhangjiagang Steer Coating Equipment Co., Ltd. was used to roughen the K4002 nickel-based high-temperature casting alloy through sandblasting. The sandblasting pressure was 0.5 MPa, the sandblasting distance was 150 mm, and the angle was 90°. After the sandblasted parts were cleaned with compressed air, the surface roughness was measured using an SJ-210 surface roughness measuring instrument manufactured by Mitutoyo Corporation of Japan. The testing standard adopted was ISO 1997.

[0081] The result of sandblasting roughening is as follows Figure 4 As shown in the figure, the material surface is uniform and continuous, with an average roughness value of 5.1 μm and an average substrate thickness reduction of 0.039.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a sandblasting slurry, characterized in that, Includes the following steps: S1: Preparation of pretreated slurry: Add 80-100 parts of hard abrasive sand and 80-120 parts of diluent to starch mixed slurry to obtain pretreated slurry. The starch mixed slurry includes 15-20 parts of organic slurry, 15-20 parts of phosphate starch, 15-20 parts of oxidized starch, 15-20 parts of acid-modified starch and 15-20 parts of oxidized acetate starch. The weight ratio of starch mixed slurry to hard abrasive sand is 1.5:1 to 2:

1. The organic slurry is starch slurry with a solid content of 40% to 60%. The hard abrasive sand is 46-mesh high-purity alumina. S2: Secondary treatment of the pretreated slurry: According to the weight, add the following materials into the mixing tank: 30-35 parts of pretreated slurry, 3-5 parts of cement molecule secondary reactant, 0.7-1 parts of antifreeze, 0.3-0.5 parts of metal ion complexing agent and 5-7 parts of antibacterial agent, wherein the cement molecule secondary reactant is triethanolamine; S3: Initial mixing: The materials in the mixing tank are stirred to form a primary mixture. The internal temperature of the mixing tank is 15℃~35℃, the relative humidity is 10%~15%, the rotation speed inside the mixing tank is 120~150r / min, and the stirring is carried out for 2~4 minutes. After stirring, it is allowed to stand for 4~6 minutes under normal pressure. S4: Secondary mixing: The obtained primary mixture is further mixed in a mixing tank to obtain the finished slurry. The internal temperature of the mixing tank is 20℃~40℃, the relative humidity is 5%~10%, the rotation speed of the mixing tank is 150~200r / min, the mixing time is 4~6 minutes, and then it is allowed to stand for 9~11 minutes. The process is carried out under normal pressure. S5: The finished slurry is gelatinized, diluted with water as a diluent, and the viscosity is measured by a viscometer to obtain the wet sandblasting slurry. The viscosity of the diluted slurry is 2-10 MPa·s.

2. The method for preparing the blasting slurry according to claim 1, characterized in that, In step S1, the diluent is water.

3. The method for preparing the blasting slurry according to claim 1, characterized in that, In step S2: The antifreeze is potassium carbonate; The metal ion complexing agent is sodium hexametaphosphate; The antibacterial agent is nano silver ion powder.

4. The method for preparing the blasting slurry according to any one of claims 1 to 3, characterized in that, In step S4, gelatinization is carried out at a high temperature of 95-98℃ for 30-35 minutes.

5. A sandblasting slurry prepared by the preparation method according to any one of claims 1 to 4.

6. An application of the sandblasting slurry according to claim 5, characterized in that: Sandblasting slurry as a high-temperature guide vane.

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