JPH071340A - Composition for resinoid-bonded grinding wheel - Google Patents

Abstract

PURPOSE:To secure a grinding wheel excellent in strength, heat resistance and refractory impact resistance in use of pulverized powder being disposed as waste matter by mixing the cut-powder of a thermosetting resin barrel spreading laminated plate or pulverizes powder of edge chips and thereby constituting a composition for a resinoid-bonded wheel. CONSTITUTION:A resinoid-bonded grinding wheel is one that grinds iron, nonferrous metal or nonmetal or the like, and since it is used under high rotational speed and heat load during grinding is also high, it is so required as to be excellent in strength and heat resistance as well as being excellent in thermal impact resistance and high in safety in time of rotation. In order to cope with these requirements, a composition for this resinoid-bonded wheel is made up of mixing cutting powder of thermosetting resin barrel spreading laminated plate or pulverized powder of edge chips for the end. In addition, this thermosetting resin barrel spreading laminated plate uses synthetic resins as a binder, by way of example, and this binder is applied onto or impregnated in an organic or inorganic base material and after being layered as a prepreg, barrel foil is laminated on one side or both sides of this prepreg and thus constituted. On the other hand, the pulverized powder is produced in use waste matter to be produced at the time cutting the barrel spreading laminated plate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resinoid grindstone composition using cutting powder of a thermosetting resin copper clad laminate or crushed powder of ear waste.

[0002]

2. Description of the Related Art Resinoid grindstones are generally used in high speed rotation and have a high thermal load during grinding. Therefore, they are required to have good strength and heat resistance and high safety during rotation. A phenolic resin is generally used as a binder for resinoid grindstones. Other epoxy resins and urethane resins may be used, but they are inferior in heat resistance and their uses are limited. Thus, phenolic resins are widely used as binders for resinoid grindstones, but they are not without problems.

Resinoid grindstones grind various things such as iron, non-ferrous metals, non-metals, etc., and are required to have good strength, heat resistance, wear resistance and high safety in each application. . Resinoid grindstone is mainly composed of abrasive grains (aluminum oxide Al ₂ O ₃ or silicon carbide SiC) as the cutting edge, and a resin and an inorganic filler (mainly cryolite or iron sulfide) as the binding component. , Hardened and made. In order to improve the strength, heat resistance, and wear resistance required for the grindstone, it is necessary to use a phenol resin suitable for the grindstone and increase the resin amount to increase the grindstone density. However, the phenol resin generates decomposition gas from hexamine, which is blended as a curing agent, and condensed water due to the reaction during curing. Therefore, if the amount of the resin is too large, the generated gas causes swelling, cracking, and deformation due to flow. This defect can be prevented to some extent by adding an inorganic filler, but there is a limit.

Further, in order to enhance safety so as not to break during rotation, it is necessary to increase the amount of resin, increase the grindstone density, and create a high-strength grindstone as described above. May be destroyed by impact. The reason why the phenol resin is used as the binder of the grindstone is that the cured resin has a high cohesive force and the adhesiveness with the abrasive grains is good. The strength of the grindstone in the low temperature region is largely due to the adhesiveness between the abrasive grains and the binder, and the strength at high temperature is largely due to the denseness and cohesive force of the hardened resin structure. Therefore, even if a large amount of resin is used, it will be possible to manufacture a grindstone excellent in strength and heat resistance if it can be produced without gas blister and flow deformation, and if the thermal shock resistance can be further improved, a highly safe grindstone can be made. be able to.

[0005]

The present inventor has found that this problem can be solved by blending a cut powder of a thermosetting resin copper clad laminate or a crushed powder of selvage into a resinoid grindstone.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a grindstone composition containing a cutting powder of a thermosetting resin copper clad laminate or a crushed powder of selvage waste. In the present invention, the thermosetting resin copper-clad laminate, a synthetic resin such as epoxy resin, phenol resin, polyester resin, melamine resin as a binder, it is applied or impregnated with an organic or inorganic substrate to form a prepreg. A copper clad laminate obtained by laminating this and laminating copper foil on one side or both sides thereof, or a multilayer printed circuit board obtained by circuit-processing this to form a multilayer.

The cutting powder of the thermosetting resin copper-clad laminate or the crushed powder of the selvage thereof is generated when the copper-clad laminate is manufactured by press molding and cut into a fixed size. The one containing copper has a low utility value and is conventionally treated as a waste. The present invention utilizes the characteristics of the powder of this thermosetting resin copper-clad laminate, and can effectively utilize resources, and is one bird and two birds. That is, the cutting powder or the crushed powder of the ear dust generated by cutting the thermosetting resin copper-clad laminate has 5 to 5 copper components in the composition.
Approximately 15% is included, and the other components are resin laminated plate components. Since the shape of copper contained in this mixed powder is a crushed copper foil having a thickness of 100 μm or less, it has a large surface area and good thermal conductivity.

In the present invention, the above-mentioned powder is a mixed composition of copper powder and powder of a resin laminated plate, and their functions are as follows. Conventional resinoid grindstones consist of abrasive grains, resin binder, and inorganic filler (such as cryolite and iron sulfide). The inorganic filler has poor adhesion to resin and has a different thermal expansion coefficient, resulting in a strong bond. There was a problem in forming. However, in the present invention, a resin cured product component is contained in the composition, but since it has good adhesiveness with the binder and has the same coefficient of thermal expansion as the binder, a dense composition is obtained. It is possible to manufacture a grindstone having excellent strength and heat resistance. In particular, a grindstone containing a crushed laminate of glass fiber as a base material is extremely tough and has good heat resistance.

Another problem with resinoid grinding wheels is that they sometimes break due to thermal shock during the grinding operation. A possible cause of destruction due to thermal shock is that the surface temperature of the grindstone during grinding work is 800 to 1500 ° C when it comes into contact with the grinding object, and the temperature difference between the contacting part with the grinding object and other parts becomes large. It is thought to be because it is too much. The abrasive grains, which are components of the grindstone, the binder resin, and the inorganic filler have low thermal conductivity, and heat is difficult to disperse. The flaky powder of copper, which is another composition of the present invention, has a large surface area, and when used as one of the whetstone compositions in combination with the good thermal conductivity of copper, it improves the thermal conductivity of the entire whetstone. It is possible to prevent the wheel from breaking due to thermal shock by reducing the temperature difference between the respective parts of the wheel.

[0010]

EXAMPLES Glass fiber base epoxy resin copper clad laminate selvage was crushed to obtain powder of 150 μm or less (hereinafter referred to as powder A). The composition of the grindstone is as follows. (Compounding) Abrasive A # 36 100 parts by weight Liquid phenol resin 4 parts by weight Powder phenol resin 12 parts by weight Powder A 8 parts by weight

100 parts by weight of abrasive grain A # 36 and 4 parts by weight of liquid phenol resin were mixed by an upper mixer, and 12 parts by weight of powdered phenol resin and 8 parts by weight of powder A were mixed by a lower mixer, and the upper mixture was mixed. The mixture was added to the lower mixture and further thoroughly mixed. 83 g of the above mixture is 15 thickness × 23 width × 100
It was placed in a long-mm mold and cut-off molding was performed for 30 seconds to obtain a molded product. The above molded product was placed in an incinerator and baked for a total baking time of 35 hours (maximum temperature 180 ° C., hold for 7 hours) to obtain a hardened grindstone.

For comparison, a grindstone was prepared with the following composition without compounding powder A. The mixing, molding and firing conditions are the same as in Example 1. (Compounding) Abrasive grain A # 36 100 parts by weight Liquid phenol resin 4 parts by weight Powder phenol resin 12 parts by weight Cliolite 8 parts by weight The strength measurement results of these hardened stones are as shown in Table 1, and the whetstone of the example. Cured product is normal temperature and hot (250 ℃)
The bending strength was high. The grindstones produced in the examples had good thermal shock resistance during grinding work.

[0013]

[0014]

The grindstone obtained from the grindstone composition of the present invention has good strength and heat resistance and can prevent the grindstone from being broken by thermal shock. In the present invention, the cutting powder or the ear dust of the thermosetting resin copper-clad laminate, which has been conventionally treated as a waste, is effectively used, and it is suitable for the purpose of resource recycling.

Claims (1)

[Claims] 1. A resinoid grindstone composition comprising a cutting powder of a thermosetting resin copper clad laminate or a crushed powder of ear waste.