Preparation process of thin high-flatness black paper coated grinding wheel mesh

Abstract

The invention relates to a preparation process of a thin high-flatness black paper coated grinding wheel mesh, which comprises the following steps of: firstly, taking a piece of glass fiber mesh cloth, soaking the glass fiber mesh cloth in a phenolic resin glue solution, and drying the glass fiber mesh cloth; secondly, coating glue is dipped on the surface of the glass fiber mesh cloth in a roller coating mode, the coating glue is prepared from white emulsion glue and pressure-sensitive glue, and the dipping amount is 10-12 g / m < 2 >; thirdly, black tissue paper or black crepe paper is compounded on the covering glue of the glass fiber mesh cloth, a solvent of the covering glue is dried through a drying cylinder, and the covering glue is pressed through a pressing roller and then rolled into a coiled material; and finally, the coiled material is unwound and slit, and the required thin high-flatness black paper coated grinding wheel mesh is obtained. When the grinding wheel mesh is prepared, the black tissue paper or the black crepe paper is adopted for compounding, the black tissue paper is lower in gram weight, under the condition that the environment humidity changes, the expansion and shrinkage stress of the black tissue paper is low, the influence on stretching or compression of the mesh is small, and the expansion and shrinkage stress of the crepe paper is almost completely eliminated after the crepe paper is subjected to crepe treatment.

Description

Technical Field

[0001] This invention relates to the field of grinding wheel mesh, and particularly to a preparation process for a thin, high-flatness black paper-coated grinding wheel mesh. Background Technology

[0002] Grinding wheel reinforcing mesh is a mesh structure reinforcing material made of glass fiber mesh impregnated with resin. It is mainly used in grinding wheel cutting discs, grinding discs and heavy-duty grinding wheels to play a reinforcing role and is an indispensable skeleton material in grinding wheels.

[0003] Thin abrasive wheel reinforcing mesh with a unit area weight of less than 125 grams per square meter is mainly suitable for thin abrasive wheels, ordinary cutting discs, and angle grinder discs, and has a large market demand. The purpose of covering one side of the abrasive wheel mesh with black paper is to prevent the resin adhesive or reinforcing mesh from adhering to the mold surface during the abrasive wheel forming process, avoiding material overflow and maintaining the cleanliness and dimensional accuracy of the abrasive wheel edges. At the same time, the black paper makes the abrasive wheel's appearance more uniform and aesthetically pleasing, facilitating product marking such as printing brand, model, and other information.

[0004] Patent CN101391401A discloses a method for applying paper to a sanding wheel-reinforced mesh, patent CN101653927A discloses a glass fiber-reinforced sanding wheel mesh application process, and patent CN102950548A discloses an improved sanding wheel mesh application process. The key technology in these patents is to increase the bonding force through a pair of pressure rollers, release paper stress, and improve the flatness of the applied mesh. For thick meshes, these solutions can, to some extent, solve the problem of overall mesh deformation caused by the unilateral expansion and contraction of black paper due to changes in ambient humidity. However, for thin meshes, existing products on the market still use the same approach as thick meshes. Black paper is typically selected in the grammage range of 25-38 g / m². Because the warp and weft yarns of thin meshes are finer, their inherent resistance to deformation is weaker. The residual stress on one side of the black paper can still cause significant warping of the mesh under humidity changes, ultimately leading to difficulties in sanding wheel forming and severely affecting its use. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a preparation process for a thin, high-flatness black paper-coated abrasive wheel mesh, so as to avoid the problem of large-scale warping of the thin black paper-coated abrasive wheel reinforced mesh.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is: a preparation process for a thin, high-flatness black paper-coated abrasive wheel mesh, the innovation of which is: including the following steps: First, take a piece of fiberglass mesh, impregnate the fiberglass mesh with phenolic resin solution, and then dry it. Secondly, the bonding adhesive, composed of white glue and pressure-sensitive adhesive, is applied to the surface of the fiberglass mesh by roller coating at a rate of 10-12 g / m². 2 ; Next, black cotton paper or black crepe paper is laminated on top of the adhesive on the fiberglass mesh, and the solvent of the adhesive is dried in the drying cylinder. After being pressed by pressure rollers, it is rolled into a roll. Finally, the roll material is unwound and slit to obtain the required thin, high-flatness black paper coated abrasive wheel screen.

[0007] Furthermore, the composite adhesive is prepared by mixing white glue and pressure-sensitive adhesive in a 1:1 ratio. The white glue is a polyvinyl acetate emulsion with a solid content of 30%, and the pressure-sensitive adhesive is an acrylic copolymer emulsion with a solid content of more than 50%.

[0008] Furthermore, the weight of the black cotton paper is 17-23 grams per square meter.

[0009] The advantages of this invention are as follows: When preparing the grinding wheel mesh, black cotton paper or black crepe paper is used for composite. The black cotton paper has a lower basis weight and low expansion and contraction stress under environmental humidity changes, which has little impact on the stretching or compression of the mesh. The crepe paper itself is wrinkled, which almost completely eliminates expansion and contraction stress.

[0010] This invention improves the flexibility of the laminating adhesive while maintaining adhesion by adding a pressure-sensitive adhesive that combines elasticity and viscosity, thereby reducing the impact of paper stress on the wire mesh. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the abrasive wheel mesh coated with black cotton paper in this invention.

[0012] Figure 2 This is a schematic diagram of the abrasive wheel mesh coated with brown crepe paper in this invention. Detailed Implementation

[0013] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0014] Example 1 The preparation process of the thin, high-flatness black paper-coated abrasive wheel mesh of the present invention is achieved through the following steps: First, take a glass fiber mesh with a mesh size of 14 mesh and a weight of 85 grams per square meter. Impregnate the glass fiber mesh with phenolic resin solution and then dry it.

[0015] Secondly, the adhesive is applied to the surface of the fiberglass mesh using a roller coating method. The adhesive is prepared by mixing white glue and pressure-sensitive adhesive in a 1:1 ratio. The white glue is a polyvinyl acetate emulsion with a solid content of 30%, and the pressure-sensitive adhesive is an acrylic copolymer emulsion with a solid content of more than 50%. The application rate is 10-12 g / m². 2 .

[0016] Next, 22 g / m² of black cotton paper is laminated on top of the adhesive on the fiberglass mesh, and the solvent of the adhesive is dried in the drying cylinder. After being pressed by pressure rollers, it is rolled into a roll.

[0017] Finally, the roll material is unwound and slit to obtain the required thin, high-flatness black paper-coated abrasive wheel screen, such as... Figure 1 As shown.

[0018] Example 2 The preparation process of the thin, high-flatness black paper-coated abrasive wheel mesh of the present invention is achieved through the following steps: First, take a 14-mesh fiberglass mesh with a weight of 85 g / m², impregnate it with phenolic resin solution, and then dry it.

[0019] Secondly, the adhesive is applied to the surface of the fiberglass mesh using a roller coating method. The adhesive is prepared by mixing white glue and pressure-sensitive adhesive in a 1:1 ratio. The white glue is a polyvinyl acetate emulsion with a solid content of 30%, and the pressure-sensitive adhesive is an acrylic copolymer emulsion with a solid content of more than 55%. The application rate is 10-12 g / m². 2 .

[0020] Next, 35 g / m² of black crepe paper is laminated on top of the adhesive layer of the fiberglass mesh, and the solvent in the adhesive layer is dried in an oven. After being pressed by pressure rollers, it is wound into a roll. In this embodiment, the black crepe paper is made by creping ordinary black paper of the same weight.

[0021] Finally, the roll material is unwound and slit to obtain the required thin, high-flatness black paper-coated abrasive wheel screen, such as... Figure 2 As shown.

[0022] Table 1 compares the bonding effects of abrasive wheel mesh sheets formed by laminating black cotton paper, black crepe paper, and fiberglass mesh using the above embodiments, with those formed by laminating ordinary black paper and fiberglass mesh. Table 1 Table 2 shows a comparison of the composite effects of composite adhesives prepared with different ratios of white glue and pressure-sensitive adhesive: Table 2 As can be seen from the data in Table 1, under open storage conditions at room temperature, the warpage of the grinding wheel mesh formed by laminating 17-23 g / m² black cotton paper with glass fiber mesh is controlled within the range of 0-2 mm, which fully meets the requirements of the JB / T11432-2013 standard "Glass Fiber Reinforced Mesh for Bonded Abrasives". However, when the basis weight of the black cotton paper exceeds the range of 17-23 g / m², the warpage increases. When the basis weight of the brown cotton paper is below the range of 17-23 g / m², the warpage decreases further and even tends to be flat, but the burst strength is low. The warpage of the grinding wheel mesh formed by laminating black crepe paper with glass fiber mesh is controlled within the range of 0-1 mm, which is better than the minimum requirement of the JB / T11432-2013 standard "Glass Fiber Reinforced Mesh for Bonded Abrasives". The warpage of the grinding wheel mesh formed by laminating black ordinary paper with glass fiber mesh is larger.

[0023] As can be seen from the data in Table 2, when using white glue alone as the bonding adhesive, the warpage of the grinding wheel mesh is relatively large. When using pressure-sensitive adhesive alone as the bonding adhesive, although the warpage is small, the bonding effect is poor, and a smearing phenomenon occurs. The bonding adhesive prepared by using white glue and pressure-sensitive adhesive has a good bonding effect and small warpage. Among them, the bonding adhesive prepared by a 1:1 ratio has the best bonding effect. Although the bonding adhesive prepared by a 4:6 ratio has a smaller warpage after bonding, the grinding wheel mesh will turn white after bonding.

[0024] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A process for preparing a thin, high-flatness black paper-coated abrasive wheel mesh, characterized in that: Includes the following steps: First, take a piece of fiberglass mesh, impregnate the fiberglass mesh with phenolic resin solution, and then dry it. Secondly, the bonding adhesive, composed of white glue and pressure-sensitive adhesive, is applied to the surface of the fiberglass mesh by roller coating at a rate of 10-12 g / m². 2 ; Next, black cotton paper or black crepe paper is laminated on top of the adhesive on the fiberglass mesh, and the solvent of the adhesive is dried in the drying cylinder. After being pressed by pressure rollers, it is rolled into a roll. Finally, the roll material is unwound and slit to obtain the required thin, high-flatness black paper coated abrasive wheel screen.

2. The preparation process of the thin, high-flatness black paper-coated abrasive wheel mesh according to claim 1, characterized in that: The composite adhesive is prepared by mixing white glue and pressure-sensitive adhesive in a 1:1 ratio. The white glue is a polyvinyl acetate emulsion with a solid content of 30%, and the pressure-sensitive adhesive is an acrylic copolymer emulsion with a solid content of more than 50%.

3. The preparation process of the thin, high-flatness black paper-coated abrasive wheel mesh according to claim 1, characterized in that: The weight of the black cotton paper is 17-23 grams per square meter.

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