Method for preparing polyurethane fiber guide wheel used for cutting silicon slice

Abstract

The invention relates to a method for preparing a polyurethane fiber guide wheel used for cutting a silicon slice. The method comprises the following steps of: mixing 0.5-1.0 part of carbodiimide and 3-5 parts of calcium sulphate crystal whisker with 100 parts of polyether polyol, then stirring, heating and dehydrating the materials in a reaction kettle, and adding 30-50 parts of isocyanate to the reaction kettle for a polymerization reaction to prepare a prepolymer and defoaming the prepolymer; mixing the defoamed prepolymer with a liquid polyurethane solidifying agent in the ratio of 100: (15-30) in a casting machine to prepare a polyurethane liquid material, placing an assembled die and a metal spindle into a heating box for heating, and pouring the polyurethane liquid material to a hollow cavity between an adhesive layer and the die and to a hooped pouring opening; and placing the die poured with the polyurethane liquid material into the heating box, then carrying out vulcanization forming treatment, demolding, carrying out additional vulcanization, and machining a guide groove on the surface of a polyurethane coating. The method for preparing the polyurethane fiber guide wheel used for cutting the silicon slice has the characteristics of light weight and improved production efficiency and quality of the guide wheel.

Description

technical field [0001] The invention relates to a method for preparing a polyurethane fiber guide wheel for cutting silicon wafers, belonging to the technical field of silicon wafer cutting equipment. Background technique [0002] Polyurethane elastomer macromolecular main chain contains many repeated urethane groups, it is a new type of polymer synthetic material between rubber and plastic, its macromolecular main chain is made of polyester or polyether, etc. The soft segment of polyol is inlaid with the rigid segment composed of isocyanate and chain extender. This structure makes polyurethane elastomer have excellent wear resistance, good mechanical properties and wide hardness range. Therefore, polyurethane elastomer Currently used as a coating for polyurethane guide wheels for cutting silicon wafers. The polyurethane guide wheel is coated with a 10-15mm polyurethane coating on the surface of the metal mandrel. There are several guide grooves on the surface of the coatin...

AI Technical Summary

Problems solved by technology

But above-mentioned production method energy consumption is high on the one hand, and processing time is long, although can reduce the air bubble in making polyurethane liquid material, when polyurethane liquid material is injected into mould, on the one hand due to hot polyurethane liquid material and cold metal mandrel and The temperature difference between the moulds is large. When the polyurethane liquid material is injected, it is easy to cause bubbles due to the large temperature difference between cold and hot. On the other hand, because most of the polyurethane liquid material is vertically injected into the cold metal mandrel and the cavity of the mold, it will cause a certain impact. , so air enters the mold during the final pouring process, which will cause air bubbles in the polyurethane coating, which will affect the processing quality of the guide groove and the yield of the guide wheel

Furthermore, since the polyurethane guide wheel adopts a metal mandrel, the weight of the polyurethane guide wheel itself is relatively heavy, and it is inconvenient to operate during maintenance and processing. In addition, the lower part of the polyurethane coating is made of metal material, and the thermal insulation performance of the metal is not good, causing the slicer The service life is not long

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