A method for preparing abrasive wheel mesh that can improve coating strength

Abstract

This invention discloses a method for preparing abrasive wheel mesh that can improve the strength of a coating. S1: Fabrication of fiberglass cloth; S2: Fabrication of adhesive, using the following materials: 60-100 parts of thermoplastic phenolic resin solid, 6-10 parts of curing agent, 5-8 parts of defoamer, 5-8 parts of reinforcing filler, 30-50 parts of thermosetting phenolic resin liquid, 0.5-2 parts of coupling agent, and 80-140 parts of alcohol; S3: Coating; S4: Coating. This invention adds a curing agent and a reinforcing filler to the adhesive. The addition of both reduces the coefficient of thermal expansion and curing shrinkage of the cured material, thus reducing internal stress. When cracks appear under overload, the filler-containing adhesive layer can prevent crack propagation, thereby improving the bonding strength. Simultaneously, by strictly controlling the coating amount and the relative humidity of the coating during the coating process, the bonding strength and coating strength are further improved.

Description

Technical Field

[0001] This invention relates to the field of abrasive wheel mesh preparation, and particularly to a method for preparing abrasive wheel mesh that can improve the coating strength. Background Technology

[0002] The mesh of a grinding wheel is the skeleton of a resin grinding wheel, playing a crucial role in the overall strength of the wheel and directly determining its quality. The general manufacturing process for grinding wheel mesh is as follows: wire drawing → glass fiber impregnation treatment → weaving of glass fiber mesh → impregnation of glass fiber mesh with adhesive → drying and slicing.

[0003] Glass fiber reinforced mesh is made by coating glass fiber reinforced mesh with phenolic and epoxy modified resins, baking it, and then punching it. The cutting process uses a one-time punching process for both outer diameter and inner hole, resulting in advantages such as small dimensional tolerances, good concentricity, and smooth edges. Glass fiber has been used as a reinforcing material for grinding wheels in China for many years. Untreated glass fiber is brittle and cannot be used; therefore, the surface of the glass fiber needs to be coated with a special surface treatment agent, i.e., a wetting agent, to realize its application value.

[0004] In the existing manufacturing process of glass fiber reinforced abrasive wheel mesh, in order to further ensure the wear resistance and strength of the abrasive wheel mesh, a protective medium, such as black paper, non-woven fabric, or plastic film, is usually coated onto the surface of the abrasive wheel mesh with an adhesive. However, the adhesive formulation used in the existing abrasive wheel mesh coating process is simple, with weak bonding force between the adhesive and the medium and the abrasive wheel mesh, resulting in low bonding strength. Consequently, the coating strength of the abrasive wheel mesh is reduced. Therefore, there is a need to provide a method for preparing abrasive wheel mesh that can improve the coating strength. Summary of the Invention

[0005] The purpose of this invention is to provide a method for preparing a grinding wheel mesh that can improve the coating strength, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for preparing a grinding wheel mesh that can improve the coating strength, wherein the preparation steps of the grinding wheel mesh are as follows:

[0007] S1: Fiberglass cloth production: Glass is selected as the main raw material (except for organic, mercury, brown and high temperature glass). After being crushed, it is heated (1100-1300 degrees Celsius) - melted - drawn - pulled - softened - clamped - finished product to obtain fiberglass. The fiberglass filaments are used as warp and weft yarns and drawn into a warping machine. After being processed by the warping machine, the resulting yarn sheet is drawn into an air-jet loom. The loom is then made into fiberglass abrasive wheel cloth to obtain fiberglass abrasive wheel mesh cloth.

[0008] S2: Adhesive preparation

[0009] 1) Selected materials: 60-100 parts of thermoplastic phenolic resin solid, 6-10 parts of curing agent, 5-8 parts of defoamer, 5-8 parts of reinforcing filler, 30-50 parts of thermosetting phenolic resin liquid, 0.5-2 parts of coupling agent, and 80-140 parts of alcohol. Among them, the curing agent can be any one or more of dicyandiamide, m-phenylenediamine, diaminodiphenylmethane, diaminodiphenyl sulfone, and low molecular weight polyamide. The reinforcing filler can be any one or more of silica powder, fumed silica, wollastonite powder, alumina, and ultrafine aluminum silicate. The addition of filler reduces the coefficient of thermal expansion and curing shrinkage of the cured product, reduces internal stress, and when cracks occur under overload, the filler-filled adhesive layer can also prevent crack propagation, thereby improving the bonding strength.

[0010] 2) Mixing and molding: First, add thermoplastic phenolic resin solid, alcohol and appropriate amount of aqueous solution to the reaction vessel and stir until the thermoplastic phenolic resin solid dissolves. Then, add thermosetting phenolic resin liquid, defoamer, reinforcing filler, coupling agent and curing agent to the reaction vessel according to appropriate components and stir and mix thoroughly. After standing and cooling, the coating material is discharged.

[0011] S3: Coating. Before applying the adhesive, a layer of film-like epoxy adhesive can be first applied to the fiberglass abrasive wheel mesh. The film-like epoxy adhesive is formulated with bisphenol A type solid epoxy resin and multifunctional epoxy resin with a relatively high molecular weight. During bonding, the adhesive film easily ensures a uniform thickness, which can improve the bonding strength. After the film-like epoxy adhesive is applied, the resulting coating solution is added to the coating machine's feed tank. The fiberglass abrasive wheel mesh is then fed through the feed tank and enters the drying tunnel. To ensure the bonding strength and film strength during coating, the following precautions should be taken during operation:

[0012] a. In order to make the abrasive wheel mesh uniform in all directions during the coating process, the abrasive wheel mesh needs to be stretched;

[0013] b. Strictly control the coating amount: The amount of adhesive to be applied should be controlled at 5-10g per square meter, and the thickness of the adhesive layer should be 8-10 micrometers;

[0014] c. Strictly control the parameters of the coating machine. During the coating process, the ratio of the speed of the main conveyor to the speed of the coating machine should be 1:1.5, and the parallel gap adjustment range of the coating roller and the scraper roller should be controlled between 5-6 micrometers.

[0015] S4: Lamination. After the abrasive mesh is coated with adhesive, it needs to be covered with non-woven fabric, black paper or plastic film according to actual needs. When laminating, the relative humidity of the lamination site environment must be strictly controlled. In a working environment with high relative humidity, the equilibrium moisture value of the lamination mesh will change, making it easy to absorb a large amount of moisture. When released during the lamination process, it will form a non-adhesive phenomenon at the bonding interface and cannot be well bonded to the plastic film during lamination. Therefore, it is necessary to strictly control the relative humidity of the lamination site environment between 45-50% to improve the lamination strength.

[0016] S5: Punching and forming, punching and forming the coated abrasive mesh according to actual needs.

[0017] Preferably, the adhesive formulation ratio 1 used in the preparation process is:

[0018] raw material Raw material varieties proportion(%) Parts by weight (g) Thermoplastic phenolic resin solid Synthetic resins / 60 curing agent Aliphatic amines / 6 Defoamer Active compounds / 5 Reinforcing filler Organic or inorganic compounds / 5 Thermosetting phenolic resin liquid Synthetic resins / 30 Alcohol compound / 80 Coupling agent Inorganic polymers / 0.5

[0019] Preferably, the adhesive formulation ratio 2 used in the preparation process is:

[0020] raw material Raw material varieties proportion(%) Parts by weight (g) Thermoplastic phenolic resin solid Synthetic resins / 80 curing agent Aliphatic amines / 8 Defoamer Active compounds / 7 Reinforcing filler Organic or inorganic compounds / 7 Thermosetting phenolic resin liquid Synthetic resins / 40 Alcohol compound / 110 Coupling agent Inorganic polymers / 1

[0021] Preferably, the adhesive formulation ratio 3 used in the preparation process is:

[0022] raw material Raw material varieties proportion(%) Parts by weight (g) Thermoplastic phenolic resin solid Synthetic resins / 100 curing agent Aliphatic amines / 10 Defoamer Active compounds / 8 Reinforcing filler Organic or inorganic compounds / 8 Thermosetting phenolic resin liquid Synthetic resins / 50 Alcohol compound / 140 Coupling agent Inorganic polymers / 2

[0023] The technical effects and advantages of this invention are as follows: A method for preparing a grinding wheel mesh that can improve the coating strength. This invention adds a curing agent and a reinforcing filler to the adhesive. The curing agent is selected from any one or more of dicyandiamide, m-phenylenediamine, diaminodiphenylmethane, diaminodiphenyl sulfone, and low molecular weight polyamide. The reinforcing filler is selected from any one or more of silica powder, silica fume, wollastonite powder, alumina, and ultrafine aluminum silicate. The addition of both reduces the coefficient of thermal expansion and curing shrinkage of the cured product, and reduces internal stress. When cracks occur under overload, the filler-filled adhesive layer can also prevent crack propagation, thereby improving the bonding strength. At the same time, by strictly controlling the coating amount and the relative humidity of the coating during the coating process, the bonding strength and coating strength are further improved. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0025] This invention provides a method for preparing a grinding wheel mesh that can improve the coating strength. The preparation steps of the glass fiber reinforced grinding wheel mesh are as follows, and the preparation steps of the grinding wheel mesh are as follows:

[0026] S1: Fiberglass cloth production: Glass is selected as the main raw material (except for organic, mercury, brown and high temperature glass). After being crushed, it is heated (1100-1300 degrees Celsius) - melted - drawn - pulled - softened - clamped - finished product to obtain fiberglass. The fiberglass filaments are used as warp and weft yarns and drawn into a warping machine. After being processed by the warping machine, the resulting yarn sheet is drawn into an air-jet loom. The loom is then made into fiberglass abrasive wheel cloth to obtain fiberglass abrasive wheel mesh cloth.

[0027] S2: Adhesive preparation

[0028] 1) Selected materials: 60-100 parts of thermoplastic phenolic resin solid, 6-10 parts of curing agent, 5-8 parts of defoamer, 5-8 parts of reinforcing filler, 30-50 parts of thermosetting phenolic resin liquid, 0.5-2 parts of coupling agent, and 80-140 parts of alcohol. Among them, the curing agent can be any one or more of dicyandiamide, m-phenylenediamine, diaminodiphenylmethane, diaminodiphenyl sulfone, and low molecular weight polyamide. The reinforcing filler can be any one or more of silica powder, fumed silica, wollastonite powder, alumina, and ultrafine aluminum silicate. The addition of filler reduces the coefficient of thermal expansion and curing shrinkage of the cured product, reduces internal stress, and when cracks occur under overload, the filler-filled adhesive layer can also prevent crack propagation, thereby improving the bonding strength.

[0029] 2) Mixing and molding: First, add thermoplastic phenolic resin solid, alcohol and appropriate amount of aqueous solution to the reaction vessel and stir until the thermoplastic phenolic resin solid dissolves. Then, add thermosetting phenolic resin liquid, defoamer, reinforcing filler, coupling agent and curing agent to the reaction vessel according to appropriate components and stir and mix thoroughly. After standing and cooling, the coating material is discharged.

[0030] S3: Coating. Before applying the adhesive, a layer of film-like epoxy adhesive can be first applied to the fiberglass abrasive wheel mesh. The film-like epoxy adhesive is formulated with bisphenol A type solid epoxy resin and multifunctional epoxy resin with a relatively high molecular weight. During bonding, the adhesive film easily ensures a uniform thickness, which can improve the bonding strength. After the film-like epoxy adhesive is applied, the resulting coating solution is added to the coating machine's feed tank. The fiberglass abrasive wheel mesh is then fed through the feed tank and enters the drying tunnel. To ensure the bonding strength and film strength during coating, the following precautions should be taken during operation:

[0031] a. In order to make the abrasive wheel mesh uniform in all directions during the coating process, the abrasive wheel mesh needs to be stretched;

[0032] b. Strictly control the coating amount: The amount of adhesive to be applied should be controlled at 5-10g per square meter, and the thickness of the adhesive layer should be 8-10 micrometers;

[0033] c. Strictly control the parameters of the coating machine. During the coating process, the ratio of the speed of the main conveyor to the speed of the coating machine should be 1:1.5, and the parallel gap adjustment range of the coating roller and the scraper roller should be controlled between 5-6 micrometers.

[0034] S4: Lamination. After the abrasive mesh is coated with adhesive, it needs to be covered with non-woven fabric, black paper or plastic film according to actual needs. When laminating, the relative humidity of the lamination site environment must be strictly controlled. In a working environment with high relative humidity, the equilibrium moisture value of the lamination mesh will change, making it easy to absorb a large amount of moisture. When released during the lamination process, it will form a non-adhesive phenomenon at the bonding interface and cannot be well bonded to the plastic film during lamination. Therefore, it is necessary to strictly control the relative humidity of the lamination site environment between 45-50% to improve the lamination strength.

[0035] S5: Punching and forming, punching and forming the coated abrasive mesh according to actual needs.

[0036] Example 1: The adhesive formulation ratio 1 used in the preparation process is as follows:

[0037] raw material Raw material varieties proportion(%) Parts by weight (g) Thermoplastic phenolic resin solid Synthetic resins / 60 curing agent Aliphatic amines / 6 Defoamer Active compounds / 5 Reinforcing filler Organic or inorganic compounds / 5 Thermosetting phenolic resin liquid Synthetic resins / 30 Alcohol compound / 80 Coupling agent Inorganic polymers / 0.5

[0038] Example 2, the adhesive formulation ratio 2 used in the preparation process is:

[0039] raw material Raw material varieties proportion(%) Parts by weight (g) Thermoplastic phenolic resin solid Synthetic resins / 80 curing agent Aliphatic amines / 8 Defoamer Active compounds / 7 Reinforcing filler Organic or inorganic compounds / 7 Thermosetting phenolic resin liquid Synthetic resins / 40 Alcohol compound / 110 Coupling agent Inorganic polymers / 1

[0040] Example 3: The adhesive formulation ratio 3 used in the preparation process is as follows:

[0041] raw material Raw material varieties proportion(%) Parts by weight (g) Thermoplastic phenolic resin solid Synthetic resins / 100 curing agent Aliphatic amines / 10 Defoamer Active compounds / 8 Reinforcing filler Organic or inorganic compounds / 8 Thermosetting phenolic resin liquid Synthetic resins / 50 Alcohol compound / 140 Coupling agent Inorganic polymers / 2

[0042] In summary, the present invention provides a method for preparing abrasive wheel mesh that can improve the coating strength. The present invention adds a curing agent and a reinforcing filler to the adhesive. The curing agent is selected from any one or more of dicyandiamide, m-phenylenediamine, diaminodiphenylmethane, diaminodiphenyl sulfone, and low molecular weight polyamide. The reinforcing filler is selected from any one or more of silica powder, silica, wollastonite powder, alumina, and ultrafine aluminum silicate. The addition of both reduces the coefficient of thermal expansion and curing shrinkage of the cured product, and reduces internal stress. When cracks occur under overload, the filler-filled adhesive layer can also prevent crack propagation, thereby improving the adhesive strength. At the same time, by strictly controlling the coating amount and the relative humidity of the coating during the coating process, the adhesive strength and coating strength are further improved.

[0043] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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.

[0044] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the instructions.

[0045] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a grinding wheel mesh that can improve the coating strength, characterized in that, The preparation steps of the grinding wheel mesh are as follows: S1: Fiberglass cloth production: Glass is selected as the main raw material, excluding plexiglass, mercury glass, amber glass and high-temperature glass. After being crushed, it goes through a series of steps: heating, melting, drawing, spinning, softening, clamping, and unwinding to obtain fiberglass. The heating temperature is 1100 degrees Celsius to 1300 degrees Celsius. The obtained fiberglass filaments are used as warp and weft yarns and drawn into a warping machine. After being processed by the warping machine, the resulting yarn sheet is drawn into an air-jet loom. The loom then produces fiberglass abrasive wheel cloth, which is then used to obtain fiberglass abrasive wheel mesh cloth. S2: Adhesive preparation 1) Selected materials: 60-100 parts of thermoplastic phenolic resin solid, 6-10 parts of curing agent, 5-8 parts of defoamer, 5-8 parts of reinforcing filler, 30-50 parts of thermosetting phenolic resin liquid, 0.5-2 parts of coupling agent, and 80-140 parts of alcohol. Among them, the curing agent can be any one or more of dicyandiamide, m-phenylenediamine, diaminodiphenylmethane, diaminodiphenyl sulfone, and low molecular weight polyamide. The reinforcing filler can be any one or more of silica powder, fumed silica, wollastonite powder, alumina, and ultrafine aluminum silicate. The addition of filler reduces the coefficient of thermal expansion and curing shrinkage of the cured product, reduces internal stress, and when cracks occur under overload, the filler-filled adhesive layer can also prevent crack propagation, thereby improving the bonding strength. 2) Mixing and molding: First, add thermoplastic phenolic resin solid, alcohol and appropriate amount of aqueous solution to the reaction vessel and stir until the thermoplastic phenolic resin solid dissolves. Then, add thermosetting phenolic resin liquid, defoamer, reinforcing filler, coupling agent and curing agent to the reaction vessel according to appropriate components and stir and mix thoroughly. After standing and cooling, the coating material is discharged. S3: Coating. Before applying the adhesive, a layer of film-like epoxy adhesive can be first applied to the fiberglass abrasive wheel mesh. The film-like epoxy adhesive is formulated with bisphenol A type solid epoxy resin and multifunctional epoxy resin with a relatively high molecular weight. During bonding, the adhesive film easily ensures a uniform thickness, which can improve the bonding strength. After the film-like epoxy adhesive is applied, the resulting coating solution is added to the coating machine's feed tank. The fiberglass abrasive wheel mesh is then fed through the feed tank and enters the drying tunnel. To ensure the bonding strength and film strength during coating, the following precautions should be taken during operation: a. In order to make the abrasive wheel screen uniform in all directions during the coating process, the abrasive wheel screen needs to be stretched; b. Strictly control the coating amount: The coating amount of adhesive should be controlled at 5-10g per square meter, and the adhesive layer thickness should be 8-10 micrometers; c. Strictly control the parameters of the coating machine. During the coating process, the ratio of the speed of the main conveyor to the speed of the coating machine should be 1:1.5, and the parallel gap adjustment range of the coating roller and the scraper roller should be controlled between 5-6 micrometers. S4: Lamination. After the abrasive mesh is coated with adhesive, it needs to be covered with non-woven fabric, black paper or plastic film according to actual needs. When laminating, the relative humidity of the lamination site environment must be strictly controlled. In a working environment with high relative humidity, the equilibrium moisture value of the lamination mesh will change, making it easy to absorb a large amount of moisture. When released during the lamination process, it will form a non-adhesive phenomenon at the bonding interface and cannot be well bonded to the plastic film during lamination. Therefore, it is necessary to strictly control the relative humidity of the lamination site environment between 45-50% to improve the lamination strength. S5: Punching and forming, punching and forming the coated abrasive mesh according to actual needs.