Lightweight epoxy resin grinding wheel and method for manufacturing the same

Abstract

The present application relates to a kind of lightweight epoxy resin grinding wheel and its preparation method, the weight ratio of each raw material of grinding wheel and portion ratio is as follows: silicon carbide powder 100 parts;Epoxy resin E44 25 parts;Phenolic resin liquid 5 parts;Foaming agent DRD-001 4-12 parts;Methyl methoxy polysiloxane 3 parts;Pre-foaming powder 8-24 parts;Castor oil 2 parts;Curing agent 5933 parts;Dolomite powder 3 parts;Carbon black 0.3 parts;The steps of preparation method are as follows: 1) preparation of pre-foaming powder;2) mixing;3) after mixing, put into vacuum screw extruder, extrude through 10mm aperture;4) extruded material is poured into mold cover, normal temperature curing, after curing, demoulding;5) demoulding's grinding wheel is placed in drying oven of 155 DEG C, and the drying time is 36 hours, and grinding wheel is made.The present application has the advantages of light weight, high hardness, good thermal conductivity, good grinding performance, and non-water absorption.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of grinding wheel manufacturing, and particularly relates to a light epoxy resin grinding wheel and a preparation method thereof. BACKGROUND

[0002] The resin grinding wheel is a grinding wheel formed into a specific shape by bonding abrasive materials with a binder, and is generally used for processing various metals and non-metals. The advantages of epoxy resin in heat resistance, bonding performance, mechanical properties, molding processing performance, and cost make it the most commonly used binder matrix material for resin grinding wheels. However, the existing epoxy resin grinding wheel is generally made by adding fine naphthalene to form pores. Fine naphthalene pollutes the environment, and the resin grinding wheel prepared has low porosity and tight structure, resulting in a heavy resin grinding wheel with poor heat conduction performance during grinding. SUMMARY

[0003] The present application aims to provide a light epoxy resin grinding wheel and a preparation method thereof, which pre-foam the foaming agent to obtain a resin grinding wheel with a high porosity and small pore size of a sponge-like microporous structure, thereby improving the heat conduction performance of the resin grinding wheel.

[0004] The present application is achieved by the following technical solutions:

[0005] That is, a light epoxy resin grinding wheel, characterized in that the raw materials and their weight ratios are as follows:

[0006] Silicon carbide micro powder 100 parts;

[0007] Epoxy resin E44 25 parts;

[0008] Phenolic resin liquid 5 parts;

[0009] Foaming agent DRD-001 4-12 parts;

[0010] Methyl methoxy polysiloxane 3 parts;

[0011] Pre-foaming powder 8-24 parts;

[0012] Castor oil 2 parts;

[0013] Curing agent 593 3 parts;

[0014] Dolomite powder 3 parts;

[0015] Carbon black 0.3 parts;

[0016] The raw materials of the pre-foaming powder and their weight ratios are as follows:

[0017] Epoxy resin E44 100 parts;

[0018] Foaming agent DRD-001 10 parts;

[0019] 6 parts of methyl methoxy polysiloxane;

[0020] Five parts of curing agent SH-200.

[0021] The epoxy resin E44 of this invention is mainly synthesized from epichlorohydrin and bisphenol A. It is a liquid product generated by controlling the conditions in the production process. Manufacturer: Jiangsu Sanmu Group Co., Ltd.

[0022] The curing agent SH-200 of this invention is polymerized from a variety of compounds and can achieve secondary curing of the product (i.e., incomplete curing at 120-130 degrees Celsius and complete curing at above 150 degrees Celsius). Manufacturer: Guangzhou Xinxi Metallurgical Chemical Co., Ltd.

[0023] The curing agent 593 of this invention is an epoxy resin E44 curing agent, which is a yellow transparent liquid or a colorless transparent liquid with a molecular weight of 217.13. The manufacturer is Jiangsu Sanmu Group Co., Ltd.

[0024] The foaming agent DRD-001 of this invention is a white powder with high stability and high flowability. Its decomposition temperature range is 130-150℃. Foaming begins at 130℃, producing small bubbles. Complete decomposition occurs at 150℃, resulting in abundant gas and large pores. Manufacturer: Guangzhou Free Trade Zone Dongrunde Trading Co., Ltd.

[0025] The function of the pre-foaming powder of the present invention is to produce uniform foam at 130°C with small foam size, which prepares the resin grinding wheel to form sponge-like micropores.

[0026] Traditional resin grinding wheels typically involve adding a foaming agent all at once, resulting in a loose structure, low porosity, and loose interpores. This makes it difficult to control the wheel's thickness and reduces the strength of the epoxy resin, thus increasing the risk of damage during use.

[0027] The function of the dolomite powder in this invention: During the grinding process, the surface temperature of the workpiece can reach over 800°C, and the temperature at the grinding point of the grinding wheel is very high. When dolomite is heated to 700-900°C, it decomposes into a mixture of carbon dioxide, calcium oxide, and magnesium oxide, called caustic magnesia marble, which readily dissolves in water. After being washed away by the water flow, it forms pores, further increasing the porosity of the grinding wheel, which is beneficial for heat dissipation and chip removal during the grinding process.

[0028] A method for preparing an epoxy resin grinding wheel, characterized by the following steps:

[0029] 1) Mix epoxy resin E44, foaming agent DRD-001, methyl methoxy polysiloxane and curing agent SH-200 according to the specified ratio, and mechanically stir for 3-5 minutes at a speed of 1000-1500 r / min until uniformly mixed. Place the mixed liquid in a drying oven at 130℃ and dry for 12 hours. Grind the dried mixture into powder using a pulverizer and pass it through an 80-mesh sieve for later use. The powder after sieving is the pre-foamed powder.

[0030] 2) Mix silicon carbide micro powder, epoxy resin E44, phenolic resin liquid, foaming agent DRD-001, methyl methoxy polysiloxane, pre-foamed powder, castor oil, curing agent 593, dolomite powder, and carbon black according to the specified parts ratio, mechanically stir for 5-8 minutes, and rotate at high speed 1000r / min~1500r / min until the mixture is uniform.

[0031] 3) Put the well-mixed material from step 2) into a vacuum screw extruder and extrude it through a 10mm orifice;

[0032] 4) Pour the extruded material from step 3) into the mold sleeve, cure at room temperature, and demold after curing;

[0033] 5) The demolded grinding wheel is placed in a drying oven at 155℃ and dried for 36 hours to complete the grinding wheel.

[0034] The purpose of extrusion in step 3) of this invention:

[0035] 1) The pressure at the extrusion port gives the mixture a certain degree of compactness;

[0036] 2) During the stirring process in step 2), air bubbles will be generated (air is generated during stirring). The extrusion process will expel the gas, ensuring that the grinding wheel is evenly bubbled.

[0037] The grinding wheel forming material of the present invention is a wet material with a certain degree of fluidity, which can make the grinding wheel structure more uniform.

[0038] Furthermore, in step 2) of this invention, the mixing environment requirements are: temperature 23℃~27℃, humidity 40~55%, and dust-free.

[0039] Within the above parameter range, the viscosity of the epoxy resin is suitable, which is beneficial for uniform mixing.

[0040] Furthermore, after the grinding wheel of the present invention is demolded, it is protected before entering the drying oven. The outer ring of the grinding wheel is wrapped with kraft paper, and sand is buried in the inner hole and the surface to prevent deformation and uneven heating.

[0041] The release agent used in the demolding of the grinding wheel in this invention is soap solution, and the ratio of soap to warm water is 2:1.

[0042] The present invention has the following advantages:

[0043] 1) The resin grinding wheel formed a sponge-like micropore inside, with high porosity and tight structure between pores. It can compress an equal amount of material per unit volume. The high density of epoxy resin can better hold the abrasive, making it less likely for the abrasive to fall off. It is lightweight, has high hardness, good thermal conductivity, and good grinding performance.

[0044] 2) The resulting resin grinding wheel has a high epoxy resin content, forming a resin layer. The abrasive is uniformly coated with epoxy resin, does not absorb water, and has good water resistance. Attached Figure Description

[0045] Figure 1 This is an enlarged internal view of the epoxy resin grinding wheel prepared in Example 1 of the present invention;

[0046] Figure 2 This is an enlarged internal view of the epoxy resin grinding wheel obtained in Example 2 of the present invention;

[0047] Figure 3 This is an enlarged internal view of the epoxy resin grinding wheel prepared in Example 3 of the present invention;

[0048] Figure 4 This is an enlarged view of the interior of the epoxy resin grinding wheel prepared in Comparative Example 1.

[0049] Figure 5 The graph shows a numerical comparison of the grinding wheels prepared in Examples 1-3 and the grinding wheel prepared in Comparative Example 1 after a rotary crushing experiment.

[0050] Figure 6 The graph shows a comparison of the average weight of the grinding wheels prepared in Examples 1-3 after being immersed in water and the weight of the grinding wheel prepared in Comparative Example 1 after being immersed in water. Detailed Implementation

[0051] The embodiments of the technical solution of the present invention are described in detail below. These embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore merely examples, not intended to limit the scope of protection of the present invention. It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning understood by those skilled in the art. Example 1

[0052] 1) Mix 100 parts epoxy resin E44, 10 parts foaming agent DRD-001, 6 parts methyl methoxy polysiloxane and 5 parts curing agent SH-200, and mechanically stir for 3-5 minutes at a speed of 1000r / min-1500r / min until uniformly mixed. Place the stirred mixture in a drying oven at 130℃ and dry for 12 hours. Grind the dried mixture into powder using a pulverizer and pass it through an 80-mesh sieve for later use. The powder after sieving is pre-foamed powder.

[0053] 2) Mix 100 parts silicon carbide micro powder, 25 parts epoxy resin E44, 5 parts phenolic resin liquid, 4 parts foaming agent DRD-001, 3 parts methyl methoxy polysiloxane, 8 parts pre-foamed powder, 2 parts castor oil, 3 parts curing agent 593, 3 parts dolomite powder, and 0.3 parts carbon black. Mechanically stir for 5-8 minutes, rotate at high speed 1000r / min~1500r / min, and mix evenly. The temperature during mixing should be 23℃~27℃, the humidity should be 40~55%, and the mixture should be dust-free.

[0054] 3) Put the well-mixed material from step 2) into a vacuum screw extruder and extrude it through a 10mm orifice;

[0055] 4) Weigh 3kg of the extruded material from step 3) and pour it into a fixed mold sleeve of 400*30*127. Cover it with the template and cure at room temperature. After curing, demold. The demolding agent used is soap solution, and the ratio of soap to warm water is 2:1.

[0056] 5) Before the demolded grinding wheel enters the drying oven, it is protected by wrapping the outer ring of the grinding wheel with kraft paper, embedding sand in the inner hole and surface, and drying it in a drying oven at 155℃ for 36 hours. The grinding wheel is then made. Example 2

[0057] 1) Mix 100 parts epoxy resin E44, 10 parts foaming agent DRD-001, 6 parts methyl methoxy polysiloxane and 5 parts curing agent SH-200, and mechanically stir for 3-5 minutes at a speed of 1000r / min-1500r / min until uniformly mixed. Place the stirred mixture in a drying oven at 130℃ and dry for 12 hours. Grind the dried mixture into powder using a pulverizer and pass it through an 80-mesh sieve for later use. The powder after sieving is pre-foamed powder.

[0058] 2) Mix 100 parts silicon carbide micro powder, 25 parts epoxy resin E44, 5 parts phenolic resin liquid, 8 parts foaming agent DRD-001, 3 parts methyl methoxy polysiloxane, 16 parts pre-foamed powder, 2 parts castor oil, 3 parts curing agent 593, 3 parts dolomite powder, and 0.3 parts carbon black. Mechanically stir for 5-8 minutes, rotate at high speed 1000r / min~1500r / min, and mix evenly. The temperature during mixing should be 23℃~27℃, the humidity should be 40~55%, and the mixture should be dust-free.

[0059] 3) Put the well-mixed material from step 2) into a vacuum screw extruder and extrude it through a 10mm orifice;

[0060] 4) Weigh 3kg of the extruded material from step 3) and pour it into a fixed mold sleeve of 400*30*127. Cover it with the template and cure at room temperature. After curing, demold. The demolding agent used is soap solution, and the ratio of soap to warm water is 2:1.

[0061] 5) Before the demolded grinding wheel enters the drying oven, it is protected by wrapping the outer ring of the grinding wheel with kraft paper, embedding sand in the inner hole and surface, and drying it in a drying oven at 155℃ for 36 hours. The grinding wheel is then made. Example 3

[0062] 1) Mix 100 parts epoxy resin E44, 10 parts foaming agent DRD-001, 6 parts methyl methoxy polysiloxane and 5 parts curing agent SH-200, and mechanically stir for 3-5 minutes at a speed of 1000r / min-1500r / min until uniformly mixed. Place the stirred mixture in a drying oven at 130℃ and dry for 12 hours. Grind the dried mixture into powder using a pulverizer and pass it through an 80-mesh sieve for later use. The powder after sieving is pre-foamed powder.

[0063] 2) Mix 100 parts silicon carbide micro powder, 25 parts epoxy resin E44, 5 parts phenolic resin liquid, 12 parts foaming agent DRD-001, 3 parts methyl methoxy polysiloxane, 24 parts pre-foamed powder, 2 parts castor oil, 3 parts curing agent 593, 3 parts dolomite powder, and 0.3 parts carbon black. Mechanically stir for 5-8 minutes, rotate at high speed 1000r / min~1500r / min, and mix evenly. The temperature during mixing should be 23℃~27℃, the humidity should be 40~55%, and the mixture should be dust-free.

[0064] 3) Put the well-mixed material from step 2) into a vacuum screw extruder and extrude it through a 10mm orifice;

[0065] 4) Weigh 3kg of the extruded material from step 3) and pour it into a fixed mold sleeve of 400*30*127. Cover it with the template and cure at room temperature. After curing, demold. The demolding agent used is soap solution, and the ratio of soap to warm water is 2:1.

[0066] 5) Before the demolded grinding wheel enters the drying oven, it is protected by wrapping the outer ring of the grinding wheel with kraft paper, embedding sand in the inner hole and surface, and drying it in a drying oven at 155℃ for 36 hours. The grinding wheel is then made. Comparative Example 1

[0067] Manufacturing method of ordinary epoxy resin grinding wheel: Mix 100 parts silicon carbide micro powder, 10 parts epoxy resin E44, 20 parts phenolic resin powder, and 10 parts refined naphthalene evenly, pass through a 30-mesh sieve, pour 3 kg of the mixture into a fixed mold sleeve of 400*80*127, press to form, the grinding wheel thickness is 30 mm, remove the grinding wheel from the mold and place it in a drying oven at 155℃ for 36 hours to dry, and the grinding wheel is made.

[0068] Figures 1-3 This is an enlarged view of the interior of the epoxy resin grinding wheels prepared in Examples 1-3. Figure 4This is an enlarged view of the interior of the epoxy resin grinding wheel prepared in Comparative Example 1. The comparison clearly shows that:

[0069] Examples 1-3 show that epoxy resin grinding wheels have sponge-like micropores inside, high porosity, and dense structure between pores;

[0070] Comparative Example 1 yielded an epoxy resin grinding wheel with low internal porosity and loose interpore structure.

[0071] Raw material strength:

[0072] The lightweight epoxy resin grinding wheels prepared in Examples 1-3 are cured at room temperature. After the resin is cured, the grinding wheels become hard and have high strength, allowing them to be moved freely.

[0073] The grinding wheel prepared in Comparative Example 1 has low density and the resin is not cured. It is soft, has low burr strength, cannot be touched, and is brittle. After natural drying, it has a certain strength and can be moved gently.

[0074] Grinding wheel hardness:

[0075] The definition of grinding wheel hardness: the degree of difficulty for abrasive particles to detach from the surface of the grinding wheel.

[0076] Equal amounts of epoxy resin. The lightweight epoxy resin grinding wheels prepared in Examples 1-3 have pores, high porosity, and tight structure between pores. When an equal amount of material is compressed per unit volume, the epoxy resin has a high density, better holding force on the abrasive, and thus higher hardness.

[0077] The hardness value was determined using a sandblasting hardness tester (0.4cm). 3 ) measured

[0078] Example 1: 1.75-1.6;

[0079] Example 2: 1.65-1.6;

[0080] Example 3: 1.48-1.65;

[0081] Comparative Example 1: 2.5-2.8.

[0082] The above comparison shows that, using equal amounts of resin, the lightweight epoxy resin grinding wheels prepared in Examples 1-3 are two grades harder than the grinding wheel prepared in Comparative Example 1.

[0083] like Figure 5 As shown: The epoxy resin grinding wheels prepared in Examples 1-3 and the grinding wheel prepared in Comparative Example 1 were subjected to a grinding wheel rotation crushing experiment.

[0084] As can be seen from the data in the figure, under the same density, the epoxy resin grinding wheels prepared in Examples 1-3 have higher rotational strength.

[0085] like Figure 6As shown: The epoxy resin grinding wheels prepared in Examples 1-3 were subjected to water immersion tests. After immersion, they were removed, the surface moisture was wiped off, and they were weighed. The average weight value was then compared with the grinding wheel prepared in Comparative Example 1. After immersion, the grinding wheels were removed, the surface moisture was wiped off, and they were weighed.

[0086] As can be seen from the data in the figure, the epoxy resin grinding wheels prepared in Examples 1-3 do not absorb water and have stable performance.

[0087] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A method for preparing a lightweight epoxy resin grinding wheel, characterized in that... The steps are as follows: 1) Mix 100 parts epoxy resin E44, 10 parts foaming agent DRD-001, 6 parts methyl methoxy polysiloxane and 5 parts curing agent SH-200 according to the part ratio, and mechanically stir for 3-5 minutes at a speed of 1000r / min-1500r / min until uniform. Place the stirred mixture in a drying oven at 130℃ and dry for 12 hours. Grind the dried mixture into powder using a pulverizer and pass it through an 80-mesh sieve for later use. The powder after sieving is the pre-foamed powder. 2) Mix 100 parts of silicon carbide micro powder, 25 parts of epoxy resin E44, 5 parts of phenolic resin liquid, 4-12 parts of foaming agent DRD-001, 3 parts of methyl methoxy polysiloxane, 8-24 parts of pre-foamed powder, 2 parts of castor oil, 3 parts of curing agent 593, 3 parts of dolomite powder, and 0.3 parts of carbon black according to the specified parts ratio. Mechanically stir for 5-8 minutes and rotate at high speed of 1000r / min~1500r / min until the mixture is uniform. 3) Put the well-mixed material from step 2) into a vacuum screw extruder and extrude it through a 10mm orifice; 4) Pour the extruded material from step 3) into the mold sleeve, cure at room temperature, and demold after curing; 5) The demolded grinding wheel is placed in a drying oven at 155℃ and dried for 36 hours to complete the grinding wheel.

2. The method for preparing a lightweight epoxy resin grinding wheel according to claim 1, characterized in that... In step 2), the mixing environment requirements are: temperature 23℃~27℃, humidity 40~55%, and dust-free.

3. The method for preparing a lightweight epoxy resin grinding wheel according to claim 1, characterized in that... After the grinding wheel is demolded, it is protected before entering the drying oven. The outer ring of the grinding wheel is wrapped with kraft paper, and sand is buried in the inner hole and the surface layer.

4. A lightweight epoxy resin grinding wheel, prepared according to the method for preparing a lightweight epoxy resin grinding wheel according to claim 1, 2, or 3, characterized in that... The ingredients and their weight proportions are as follows: 100 parts of silicon carbide micro powder; 25 parts of epoxy resin E44; 5 parts of phenolic resin solution; Foaming agent DRD-001: 4-12 parts; 3 parts of methyl methoxy polysiloxane; 8-24 parts of pre-formulated powder; 2 parts castor oil; Hardener 593 3 parts; 3 parts dolomite powder; 0.3 parts carbon black; The raw materials and their weight ratios for the pre-foamed powder are as follows: 100 parts of epoxy resin E44; 10 parts of foaming agent DRD-001; 6 parts of methyl methoxy polysiloxane; Five parts of curing agent SH-200.

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