A kind of resin grinding block for roller grinding and finishing and its preparation method

Abstract

The present invention discloses a barrel polishing resin grinding block, comprising the following components in parts by weight: 48-57 parts of E-44 epoxy resin, 12-17 parts of curing agent, 3-5 parts of diluent, 21-35 parts of brown corundum powder, 0.5-2 parts of dispersant, and 0.5-2 parts of anhydrous ethanol. The present invention also discloses a method for preparing a barrel polishing resin grinding block, wherein E-44 epoxy resin, diluent, dispersant, and anhydrous ethanol are added to a vacuum stirring tank and mixed evenly; brown corundum powder is added to the base material of the vacuum stirring tank, and the stirring tank is vacuumized and mixed evenly; the mixture is poured into a high-speed stirring barrel, a curing agent is added, and stirred evenly; the finished material is poured into a mold for scraping; the cured blank is demoulded, and dried at 90°C for 4-6 hours to obtain a grinding block. The present invention adopts the above-mentioned barrel polishing resin grinding block and its preparation method, which can solve the problems of the existing grinding block having a large odor, easily generating toxic gases, difficult wastewater treatment, weak cutting force, and a large wear rate.

Description

Technical Field

[0001] The invention relates to the technical field of workpiece surface finishing processing, in particular to a roller grinding and finishing processing resin grinding block and a preparation method thereof. Background Art

[0002] The surface polishing of metal parts is generally carried out by mechanical, chemical and electrolytic methods. Among them, barrel finishing is a green, efficient and low-cost mechanical method. The principle of barrel finishing is to place the workpiece in a specific environment filled with barrel polishing blocks and liquid media (abrasive fluid and water). The barrel polishing blocks use a certain movement mode and a certain force to randomly collide, roll, scratch and micro-grind the workpiece surface to improve the surface quality of the workpiece and achieve finishing of the workpiece surface.

[0003] The abrasive tools used in the barrel finishing process are generally blocks of various shapes made of abrasives and binders. Such abrasive tools are collectively referred to as barrel grinding blocks, or abrasive blocks for short. As the main processing medium, abrasive blocks are the main factor in achieving the barrel grinding effect. Under the action of mechanical transmission, the abrasive blocks in the drum generate various forces, causing certain collisions and rolling effects between the abrasive blocks and the workpiece, and between the abrasive blocks.

[0004] The abrasive blocks used for barrel finishing processing need to meet the following requirements: the abrasive blocks must have dense structure, high hardness, good toughness, certain cutting ability on the workpiece surface, and be wear-resistant; in barrel finishing processing, the abrasive blocks and workpieces are always immersed in a mixture of water and abrasive fluid, which requires the abrasive blocks to have good density, low water absorption, and be resistant to water, oil, acid and alkali.

[0005] Most of the existing grinding blocks are resin grinding blocks made of unsaturated resin or urea-formaldehyde resin as a binder. These resin grinding blocks have the disadvantages of strong odor during the manufacturing process, toxic gas generated during the curing process, and the curing agent is mostly peroxide, which poses an explosion hazard. The manufactured grinding blocks have high abrasion, white foamy substances are generated during use and are difficult to handle, and the white foamy substances make subsequent sewage treatment difficult; the material removal rate for metal workpieces is low, etc. Summary of the invention

[0006] The purpose of the present invention is to provide a barrel-finished resin grinding block to solve the problems of existing grinding blocks having strong odor, easily generating toxic gases, difficult wastewater treatment, weak cutting force and high wear rate. Another purpose of the present invention is to provide a method for preparing a barrel-finished resin grinding block.

[0007] To achieve the above-mentioned purpose, the present invention provides a roller grinding and finishing resin grinding block, comprising the following components in parts by weight: 48-57 parts of E-44 epoxy resin, 12-17 parts of curing agent, 3-5 parts of diluent, 21-35 parts of brown corundum powder, 0.5-2 parts of dispersant, and 0.5-2 parts of anhydrous ethanol.

[0008] The matrix is ​​made of E-44 epoxy resin, which has the advantages of good process performance, high bonding strength, small shrinkage, excellent medium resistance, etc. In addition, E-44 epoxy resin has the characteristics of light odor, low toxicity, and little harm to the human body. In addition, no white foamy waste will be generated during the finishing process, and the wastewater is easy to handle.

[0009] Preferably, the following components are included in parts by weight: 52 parts of E-44 epoxy resin, 14 parts of curing agent, 3.5 parts of diluent, 28.5 parts of brown corundum powder, 1.5 parts of dispersant, and 0.5 parts of anhydrous ethanol.

[0010] Preferably, the curing agent is modified amine 593 curing agent.

[0011] Preferably, the diluent is an AGE diluent.

[0012] Preferably, the dispersant is BYK-410 dispersant. BYK-410 dispersant, when added to the E-44 epoxy resin system, will construct a three-dimensional structure, and the pseudoplasticity and thixotropic fluidity formed can well prevent the sedimentation and sagging of the brown corundum powder, and will not affect the leveling property, and can ensure good dispersibility of the solid additive.

[0013] Preferably, the particle size of the brown corundum powder is 180-200 mesh.

[0014] The method for preparing the above-mentioned barrel grinding and finishing resin grinding block comprises the following steps:

[0015] S1. Weigh each raw material according to the ingredient ratio;

[0016] S2, adding E-44 epoxy resin into a vacuum stirring tank, and then adding AGE diluent, BYK-410 dispersant, and anhydrous ethanol into the vacuum stirring tank while stirring, and mixing evenly to obtain a base material;

[0017] S3, adding brown corundum powder to the base material of the vacuum stirring tank while stirring, and evacuating the stirring tank, mixing evenly, to obtain a mixture;

[0018] S4. Pour the mixture into a high-speed stirring barrel, add modified amine 593 curing agent, stir while adding, stir evenly, and obtain the finished material;

[0019] S5, pouring the finished material into the mold for scraping;

[0020] S6. De-mould the solidified blank and dry it at 90°C for 4-6 hours to obtain a grinding block.

[0021] Preferably, in S2, the stirring speed is 80 rpm and the stirring time is 10-20 minutes.

[0022] Preferably, in S3, the stirring speed is 80 rpm, the stirring time is 60-80 minutes, and the vacuum degree is -0.04 Mpa.

[0023] Preferably, in S4, the stirring speed is 80 rpm and the stirring time is 5-10 minutes.

[0024] The advantages and positive effects of the barrel grinding and finishing resin grinding block and the preparation method thereof described in the present invention are:

[0025] 1. The solid raw material added to the grinding block of the present invention is brown corundum powder, which is very different from the solid raw materials quartz powder and alumina powder added to other resin grinding blocks. The cutting ability of brown corundum powder is much greater than that of quartz powder and alumina powder, which makes the resin grinding block of the present invention have a strong cutting ability, thereby shortening the finishing process time and improving the finishing process efficiency. Since the grinding block has a strong cutting ability and a low wear rate, it can be used on the roller finishing equipment to efficiently remove the floating rust or oxide skin on the surface of the parts and the burrs and flash on the edges of the metal parts.

[0026] 2. Epoxy resin has the advantages of good process performance, high bonding strength, small shrinkage, excellent medium resistance, etc. Compared with unsaturated resin and urea-formaldehyde resin as binders, epoxy resin has light odor, low toxicity, and less harm to the human body; the resin grinding block using epoxy resin as a binder will not produce white foamy waste during the finishing process, and the wastewater in the later stage of use can be treated by the equipment.

[0027] 3. The BYK-410 dispersant added in the present invention will construct a three-dimensional structure when added to the epoxy resin system. The pseudoplasticity and thixotropic fluidity formed can effectively prevent the sedimentation and sagging of the brown corundum powder, and will not affect the leveling property. The BYK-410 dispersant addition process does not require special temperature control, which can ensure the good dispersibility of the brown corundum powder.

[0028] The technical solution of the present invention is further described in detail below through embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a macroscopic structure diagram of the resin grinding block in Example 1 of the present invention. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is further illustrated by the following examples.

[0031] Example 1

[0032] A tumbling and finishing resin grinding block comprises the following components in parts by weight: 56 parts of E-44 epoxy resin, 16 parts of modified amine 593 curing agent, 3.5 parts of AGE diluent, 23 parts of brown corundum powder, 0.5 parts of BYK-410 dispersant and 1 part of anhydrous ethanol.

[0033] The particle size of brown corundum powder is 180 mesh.

[0034] The method for preparing the above-mentioned barrel grinding and finishing resin grinding block comprises the following steps:

[0035] S1. Weigh each raw material according to the ingredient ratio;

[0036] S2, add E-44 epoxy resin into a vacuum stirring tank, then add AGE diluent, BYK-410 dispersant, and anhydrous ethanol into the vacuum stirring tank while stirring, mix well, and obtain a base material; the stirring speed is 80 rpm, and the stirring time is 15 minutes;

[0037] S3, adding brown corundum powder to the base material of the vacuum stirring tank while stirring, and evacuating the stirring tank, mixing evenly to obtain a mixture; the stirring speed is 80 rpm, the stirring time is 65 minutes; the vacuum degree is -0.04Mpa;

[0038] S4, pour the mixture into a high-speed stirring barrel, add modified amine 593 curing agent, stir while adding, stir evenly to obtain a finished material; the stirring speed is 80 rpm, and the stirring time is 8 minutes;

[0039] S5, pouring the finished material into the mold for scraping;

[0040] S6. De-mould the solidified blank and dry it at 90°C for 4-6 hours to obtain a grinding block.

[0041] Example 2

[0042] A tumbling and finishing resin grinding block comprises the following components in parts by weight: 49 parts of E-44 epoxy resin, 12 parts of modified amine 593 curing agent, 3.5 parts of AGE diluent, 33 parts of brown corundum powder, 1.5 parts of BYK-410 dispersant and 1 part of anhydrous ethanol.

[0043] The particle size of brown corundum powder is 200 mesh.

[0044] The method for preparing the above-mentioned barrel grinding and finishing resin grinding block comprises the following steps:

[0045] S1. Weigh each raw material according to the ingredient ratio;

[0046] S2, add E-44 epoxy resin into a vacuum stirring tank, then add AGE diluent, BYK-410 dispersant, and anhydrous ethanol into the vacuum stirring tank while stirring, mix well, and obtain a base material; the stirring speed is 80 rpm, and the stirring time is 15 minutes;

[0047] S3, adding brown corundum powder to the base material of the vacuum stirring tank while stirring, and evacuating the stirring tank, mixing evenly to obtain a mixture; the stirring speed is 80 rpm, the stirring time is 65 minutes; the vacuum degree is -0.04Mpa;

[0048] S4, pour the mixture into a high-speed stirring barrel, add modified amine 593 curing agent, stir while adding, stir evenly to obtain a finished material; the stirring speed is 80 rpm, and the stirring time is 8 minutes;

[0049] S5, pouring the finished material into the mold for scraping;

[0050] S6. De-mould the solidified blank and dry it at 90°C for 4-6 hours to obtain a grinding block.

[0051] Example 3

[0052] A tumbling and finishing resin grinding block comprises the following components in parts by weight: 52 parts of E-44 epoxy resin, 14 parts of modified amine 593 curing agent, 3.5 parts of AGE diluent, 28.5 parts of brown corundum powder, 1.5 parts of BYK-410 dispersant, and 0.5 parts of anhydrous ethanol.

[0053] The particle size of brown corundum powder is 190 mesh.

[0054] The method for preparing the above-mentioned barrel grinding and finishing resin grinding block comprises the following steps:

[0055] S1. Weigh each raw material according to the ingredient ratio;

[0056] S2, add E-44 epoxy resin into a vacuum stirring tank, then add AGE diluent, BYK-410 dispersant, and anhydrous ethanol into the vacuum stirring tank while stirring, mix well, and obtain a base material; the stirring speed is 80 rpm, and the stirring time is 15 minutes;

[0057] S3, adding brown corundum powder to the base material of the vacuum stirring tank while stirring, and evacuating the stirring tank, mixing evenly to obtain a mixture; the stirring speed is 80 rpm, the stirring time is 65 minutes; the vacuum degree is -0.04Mpa;

[0058] S4, pour the mixture into a high-speed stirring barrel, add modified amine 593 curing agent, stir while adding, stir evenly to obtain a finished material; the stirring speed is 80 rpm, and the stirring time is 8 minutes;

[0059] S5, pouring the finished material into the mold for scraping;

[0060] S6. De-mould the solidified blank and dry it at 90°C for 4-6 hours to obtain a grinding block.

[0061] The grinding blocks prepared in the above-mentioned Examples 1-3 were observed. Figure 1 This is a macroscopic structure diagram of the resin grinding block of Example 1 of the present invention. As shown in the figure, it can be seen that the brown corundum powder is layered on the epoxy resin. The BJG-LL05 centrifugal free abrasive finishing equipment was used to perform finishing experiments on aluminum alloy samples of model Φ25mm*30mm and 45# steel samples, with a rotation speed of 300 rpm. The results are shown in Table 1.

[0062] Table 1 Test results of finishing process in Examples 1-3

[0063]

[0064] It can be seen from the test results in Table 1 that the wear rate of the abrasive block made in Example 1 is small, but the cutting force on metal parts is also small, and the removal force on metal parts is insufficient; the wear rate of the abrasive block made in Example 2 is large, the cutting force on metal parts is also large, the abrasive block wears quickly, and the abrasive block is not durable; the wear rate of the abrasive block made in Example 3 is moderate, and it has a large cutting force on metal parts.

[0065] Therefore, the present invention adopts the above-mentioned roller grinding and finishing resin grinding block and its preparation method, which can solve the problems of existing grinding blocks such as strong odor, easy generation of toxic gas, difficult wastewater treatment, weak cutting force and high wear rate.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A resin grinding block for barrel finishing, characterized in that: The invention comprises the following components in parts by weight: 52 parts of E-44 epoxy resin, 14 parts of curing agent, 3.5 parts of diluent, 28.5 parts of brown corundum powder, 1.5 parts of dispersant, and 0.5 parts of anhydrous ethanol; The particle size of the brown corundum powder is 180-200 mesh; The curing agent is a modified amine 593 curing agent; The diluent is an AGE diluent; The dispersant is BYK-410 dispersant; The method for preparing the above-mentioned barrel grinding and finishing resin grinding block comprises the following steps: S1. Weigh each raw material according to the ingredient ratio; S2, adding E-44 epoxy resin into a vacuum stirring tank, and then adding AGE diluent, BYK-410 dispersant, and anhydrous ethanol into the vacuum stirring tank while stirring, and mixing evenly to obtain a base material; S3, adding brown corundum powder to the base material of the vacuum stirring tank while stirring, and evacuating the stirring tank, mixing evenly, to obtain a mixture; S4. Pour the mixture into a high-speed stirring barrel, add modified amine 593 curing agent, stir while adding, stir evenly, and obtain the finished material; S5, pouring the finished material into the mold for scraping; S6, demoulding the solidified blank, and drying it at 90° C. for 4-6 hours to obtain a grinding block; In S2, the stirring speed is 80 rpm and the stirring time is 10-20 minutes; In S3, the stirring speed is 80 rpm, the stirring time is 60-80 minutes, and the vacuum degree is -0.04Mpa; In S4, the stirring speed is 80 rpm and the stirring time is 5-10 minutes.

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