Resin mixture for impregnating grinding wheel mesh

Abstract

The invention relates to a resin mixture for impregnating a grinding wheel mesh. The resin mixture is prepared from the following components in parts by weight: 100 parts of thermoplastic phenolic resin, 20 to 30 parts of thermosetting phenolic resin, 0.8 part of urotropine, 2 to 4 parts of environment-friendly plasticizer, 0.2 part of KH-550, 20 to 35 parts of ethanol and 40 to 55 parts of methanol. When the resin mixture is prepared by adopting the composition, firstly, 40-55 parts of methanol and 20-35 parts of ethanol are weighed and put into a glue tank, a stirrer is started to stir and mix methanol and ethanol, then 0.2 part of KH-550 and 100 parts of thermoplastic phenolic resin are weighed and put into the glue tank, stirring is performed for 2 hours, and the resin mixture is prepared. Adding 0.8 part by weight of urotropin, 20-30 parts by weight of thermosetting phenolic resin and an environment-friendly plasticizer, fully stirring for 1 hour, taking for detection, and filtering and discharging after the test is qualified, so as to obtain the required resin mixture.

Description

Technical Field

[0001] This invention relates to the field of glass fiber mesh, and particularly to a resin mixture for impregnating grinding wheel mesh. Background Technology

[0002] Grinding wheel reinforcing mesh is a mesh structure made of glass fiber mesh impregnated with a resin mixture, dried, and then punched. It is mainly used in grinding discs, abrasive discs, and heavy-duty grinding wheels to provide reinforcement, serving as an indispensable skeleton material. The resin mixture acts as a binder, bonding well with the phenolic resin used in grinding wheel production to maximize the reinforcing effect of the glass fiber mesh and ensure the cutting and grinding performance of the grinding wheel.

[0003] Currently, grinding wheel reinforcing mesh products tend to stick together after a short period of storage under high temperature and humidity conditions, and become brittle and powdery under low temperature conditions in winter. In order to reduce costs, more and more grinding wheel manufacturers are unwilling to use wax paper to isolate and prevent sticking between the meshes, and do not use refrigerated transport and constant temperature and humidity storage. Therefore, the looseness and hardness of existing grinding wheel reinforcing mesh after storage are difficult to meet the needs of grinding wheel manufacturers.

[0004] For example, EG6.5*5.4-190 / 124*23 / 26-30 / three, in summer when the ambient temperature is above 35℃ and the relative humidity reaches 70%, the abrasive wheel-reinforced mesh absorbs moisture and softens rapidly, and sticking occurs after 3 days of storage. In winter when the ambient temperature is below 0℃, the mesh becomes brittle, and powder falls off with slight bending.

[0005] Patent CN101113080B proposes a glass fiber impregnated with phenolic resin. This patent uses ethanol as the single solvent, dibutyl phthalate or zinc phthalate as the plasticizer, and a combination of nylon, polyvinyl butyral or polyethylene glycol as the toughening agent. This improves brittleness, but dibutyl phthalate is not environmentally friendly and has been banned in the European Union, and it is also prone to sticking. Patent CN102898603B proposes a polyethylene glycol modified phenolic resin and its preparation process. The resin in this patent also uses polyethylene glycol internal plasticizer, which improves brittleness, but it also has the problem of easy adhesion. Especially in summer, when the outside temperature is high, it will cause the stored grinding wheel mesh to stick together more easily. Patent CN103481210B proposes an adhesive for abrasive wheel mesh and its preparation method, which improves both adhesion and brittleness. However, it also uses dibutyl phthalate or dizinc phthalate in its composition, which has environmental problems and has been banned by the European Union. Patent CN102952449A discloses a coating formula for abrasive wheel mesh, patent CN107384273A discloses an adhesive for ultra-large abrasive wheel-reinforced glass fiber mesh, and patent CN106243907A discloses a coating formula for abrasive wheel mesh. None of the above three patents contain plasticizers, so they all have the problem of high brittleness. Patent CN105255102A proposes a glass fiber mesh for grinding wheels and its manufacturing method. This patent uses cashew shell oil to modify phenolic resin, which softens the resin but still has the problem of easy adhesion.

[0006] Based on the above problems, there is an urgent need to improve the resin mixture used for impregnating grinding wheel mesh to enhance the hardness and looseness of the current product under different ambient temperatures, achieving a soft and non-stick effect, while meeting environmental protection requirements and satisfying users' growing demand for low cost. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a resin mixture for impregnating grinding wheel mesh, which can improve the hardness and looseness of the impregnated grinding wheel mesh, achieve a soft and non-stick effect, and at the same time meet the requirements of environmental protection.

[0008] To solve the above-mentioned technical problems, the technical solution of the present invention is: a resin mixture for impregnating grinding wheel mesh, the innovation of which is that the resin mixture is composed of the following components in parts by weight: 100 parts thermoplastic phenolic resin, 20-30 parts thermosetting phenolic resin, 0.8 parts hexamethylenetetramine, 2-4 parts environmentally friendly plasticizer, 0.2 parts KH-550, 20-35 parts ethanol and 40-55 parts methanol; When preparing the resin mixture using the above combination, firstly, weigh 40-55 parts of methanol and 20-35 parts of ethanol and put them into a glue container, and turn on the stirrer to stir and mix the methanol and ethanol. Then, weigh 0.2 parts of KH-550 and 100 parts of thermoplastic phenolic resin and put them into the glue container, stir for 2 hours, then add 0.8 parts of hexamethylenetetramine, 20-30 parts of thermosetting phenolic resin and environmentally friendly plasticizer, stir thoroughly for 1 hour, and take samples for testing. Only after the test is qualified can the mixture be filtered and discharged to obtain the desired resin mixture.

[0009] Furthermore, when the ambient temperature is ≥30℃, the environmentally friendly plasticizer is used in parts by weight, and the thermosetting phenolic resin is used in parts by weight.

[0010] Furthermore, when the ambient temperature is between 20-30℃, the environmentally friendly plasticizer is used in parts by weight, and the thermosetting phenolic resin is used in parts by weight.

[0011] Furthermore, when the ambient temperature is between 0-20℃, the environmentally friendly plasticizer is used in parts by weight, and the thermosetting phenolic resin is used in parts by weight.

[0012] Furthermore, when the ambient temperature is ≤0℃, the environmentally friendly plasticizer is used in parts by weight, and the thermosetting phenolic resin is used in parts by weight.

[0013] Furthermore, the environmentally friendly plasticizer is a terephthalate plasticizer.

[0014] Furthermore, the environmentally friendly plasticizer is any one of diisobutyl terephthalate, dioctyl terephthalate, or diisononyl terephthalate.

[0015] The advantages of this invention are as follows: The resin mixture of this invention uses a mixed solvent and an environmentally friendly plasticizer, and the ratio of thermosetting and thermoplastic phenolic resins and plasticizers is adjusted under different storage and use environments to design corresponding phenolic resin mixtures, thereby controlling the hardness and softness of the resin system and the diffusion rate of small molecule volatiles, thus extending the time before adhesion occurs after storage, solving the problems of adhesion and brittleness of grinding wheel reinforced mesh products at different storage temperatures, and meeting the environmental temperature and humidity and storage conditions of different grinding wheel manufacturers. Attached Figure Description

[0016] Figure 1 This is a flowchart illustrating the preparation process of the resin mixture for impregnating the grinding wheel mesh according to the present invention. Detailed Implementation

[0017] 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.

[0018] The resin mixture consists of the following components in parts by weight: The composition comprises 100 parts thermoplastic phenolic resin, 20-30 parts thermosetting phenolic resin, 0.8 parts hexamethylenetetramine, 2-4 parts environmentally friendly plasticizer, 0.2 parts KH-550, 20-35 parts ethanol, and 40-55 parts methanol. The environmentally friendly plasticizer is any one of diisobutyl terephthalate, dioctyl terephthalate, or diisononyl terephthalate.

[0019] like Figure 1 As shown, the above-mentioned resin mixture for impregnating grinding wheel mesh is achieved through the following steps: When preparing the resin mixture using the above combination, Table 1 shows the raw materials for preparing the resin mixture using different proportions: Example: Raw materials (parts) 1 2 3 4 Thermoplastic phenolic resin 100 100 100 100 Thermosetting phenolic resin 20 22.5 25 30 Urotropin 0.8 0.8 0.8 0.8 diisobutyl terephthalate 2 2 3 4 KH-550 0.2 0.2 0.2 0.2 ethanol 35 30 25 20 methanol 40 45 50 55 Table 1 According to the raw material composition and weight fraction in Example 1 of Table 1, firstly, 40 parts of methanol and 35 parts of ethanol were weighed and added to a glue container, and the mixer was turned on to stir and mix the methanol and ethanol. Then, 0.2 parts of KH-550 and 100 parts of thermoplastic phenolic resin were weighed and added to the glue container, and stirred for 2 hours. Then, 0.8 parts of hexamethylenetetramine, 20 parts of thermosetting phenolic resin, and 2 parts of diisobutyl terephthalate were added, and stirred thoroughly for 1 hour. Samples were taken for testing at the same time. Only after passing the test could the material be filtered and discharged to obtain the required resin mixture. During the above process, the mixer was stopped when adding materials.

[0020] The resin mixture prepared in Example 1 was used to impregnate EG6.5*5.4-190 / 124*23 / 26-30 three-layer wire mesh, and the adhesion of the mesh after storage was monitored. Specifically, 20 mesh sheets were sealed and stacked at 35°C for storage. After 15 days, the mesh sheets were easily loosened. Therefore, after impregnating the grinding wheel mesh with the resin mixture prepared in Example 1, the grinding wheel mesh is suitable for storage in environments with an ambient temperature ≥30°C.

[0021] According to the raw material composition and weight fraction in Example 2 of Table 1, firstly, 45 parts of methanol and 30 parts of ethanol were weighed and added to a glue container, and the mixer was turned on to stir and mix the methanol and ethanol. Then, 0.2 parts of KH-550 and 100 parts of thermoplastic phenolic resin were weighed and added to the glue container, and stirred for 2 hours. Then, 0.8 parts of hexamethylenetetramine, 22.5 parts of thermosetting phenolic resin, and 2 parts of diisobutyl terephthalate were added, and stirred thoroughly for 1 hour. Samples were taken for testing at the same time. Only after passing the test could the mixture be filtered and discharged to obtain the desired resin mixture. During the above process, the mixer was stopped when adding materials.

[0022] The resin mixture prepared in Example 2 was used to impregnate EG6.5*5.4-190 / 124*23 / 26-30 three-layer wire mesh, and the adhesion of the mesh after storage was monitored. Specifically, 20 mesh sheets were sealed and stacked at 25°C for storage. After 15 days, the mesh sheets were easily loosened. Therefore, after impregnating the grinding wheel mesh with the resin mixture prepared in Example 2, the grinding wheel mesh is suitable for storage in an environment with an ambient temperature of 20-30°C.

[0023] According to the raw material composition and weight fraction in Example 3 of Table 1, firstly, 50 parts of methanol and 25 parts of ethanol were weighed and added to a glue container, and the mixer was turned on to stir and mix the methanol and ethanol. Then, 0.2 parts of KH-550 and 100 parts of thermoplastic phenolic resin were weighed and added to the glue container, and stirred for 2 hours. Then, 0.8 parts of hexamethylenetetramine, 25 parts of thermosetting phenolic resin, and 3 parts of diisobutyl terephthalate were added, and stirred thoroughly for 1 hour. Samples were taken for testing at the same time. Only after passing the test could the mixture be filtered and discharged to obtain the desired resin mixture. During the above process, the mixer was stopped when adding materials.

[0024] The resin mixture prepared in Example 3 was used to impregnate EG6.5*5.4-190 / 124*23 / 26-30 three-layer wire mesh, and the adhesion of the mesh after storage was monitored. Specifically, 20 mesh sheets were sealed and stacked at 10°C for 15 days. After inspection, the mesh sheets were easily loosened. Therefore, after impregnating the grinding wheel mesh with the resin mixture prepared in Example 3, the grinding wheel mesh is suitable for storage in an environment with an ambient temperature of 0-20°C.

[0025] According to the raw material composition and weight fraction in Example 4 of Table 1, firstly, 55 parts of methanol and 20 parts of ethanol were weighed and added to a glue container, and the mixer was turned on to stir and mix the methanol and ethanol. Then, 0.2 parts of KH-550 and 100 parts of thermoplastic phenolic resin were weighed and added to the glue container, and stirred for 2 hours. Then, 0.8 parts of hexamethylenetetramine, 30 parts of thermosetting phenolic resin, and 4 parts of diisobutyl terephthalate were added, and stirred thoroughly for 1 hour. Samples were taken for testing at the same time. Only after passing the test could the mixture be filtered and discharged to obtain the desired resin mixture. During the above process, the mixer was stopped when adding materials.

[0026] The resin mixture prepared in Example 4 was used to impregnate EG6.5*5.4-190 / 124*23 / 26-30 three-layer wire mesh, and the adhesion of the mesh after storage was monitored. Specifically, 20 mesh sheets were sealed and stacked at -10°C for 15 days. After inspection, the mesh sheets were easily loosened. Therefore, the resin mixture prepared in Example 4 is suitable for impregnation of grinding wheel mesh in environments with an ambient temperature ≤0°C.

[0027] 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 resin mixture for impregnating abrasive wheel mesh, characterized in that: The resin mixture consists of the following components in parts by weight: 100 parts thermoplastic phenolic resin, 20-30 parts thermosetting phenolic resin, 0.8 parts hexamethylenetetramine, 2-4 parts environmentally friendly plasticizer, 0.2 parts KH-550, 20-35 parts ethanol and 40-55 parts methanol; When preparing the resin mixture using the above combination, firstly, weigh 40-55 parts of methanol and 20-35 parts of ethanol and put them into a glue container, and turn on the stirrer to stir and mix the methanol and ethanol. Then, weigh 0.2 parts of KH-550 and 100 parts of thermoplastic phenolic resin and put them into the glue container, stir for 2 hours, then add 0.8 parts of hexamethylenetetramine, 20-30 parts of thermosetting phenolic resin and environmentally friendly plasticizer, stir thoroughly for 1 hour, and take samples for testing. Only after the test is qualified can the mixture be filtered and discharged to obtain the desired resin mixture.

2. The resin mixture for impregnating grinding wheel mesh according to claim 1, characterized in that: When the ambient temperature is ≥30℃, the environmentally friendly plasticizer is used in parts by weight, and the thermosetting phenolic resin is used in parts by weight.

3. The resin mixture for impregnating grinding wheel mesh according to claim 1, characterized in that: When the ambient temperature is 20-30℃, the environmentally friendly plasticizer is used in 2 parts by weight and the thermosetting phenolic resin is used in 22.5 parts by weight.

4. The resin mixture for impregnating grinding wheel mesh according to claim 1, characterized in that: When the ambient temperature is between 0-20℃, the environmentally friendly plasticizer is used in 3 parts by weight and the thermosetting phenolic resin is used in 25 parts by weight.

5. The resin mixture for impregnating grinding wheel mesh according to claim 1, characterized in that: When the ambient temperature is ≤0℃, the environmentally friendly plasticizer is used in 4 parts by weight and the thermosetting phenolic resin is used in 30 parts by weight.

6. The resin mixture for impregnating grinding wheel mesh according to claim 1, characterized in that: The environmentally friendly plasticizer is a terephthalate plasticizer.

7. The resin mixture for impregnating grinding wheel mesh according to claim 6, characterized in that: The environmentally friendly plasticizer is any one of diisobutyl terephthalate, dioctyl terephthalate, or diisononyl terephthalate.

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