A kind of manufacture method of polyurethane polishing material

Abstract

The invention discloses a preparation method of polyurethane polishing material; the polyurethane polishing material is prepared by a 'rapid three-step method' technology, so that the viscosity and the reaction head of all reaction stages can be better controlled, the demands that the material has a certain aperture ratio and solid filler is rapidly and evenly mixed can be met, and the effects of stable operation and good production repeatability can be achieved; and a prepared polyurethane polished section is even in foams, the service life and the cutting rate are greatly improved, and the highest yield reaches up to more than 95%.

Description

technical field [0001] The invention relates to a manufacturing method of a polyurethane polishing material. Background technique [0002] The polyurethane polishing sheet used in optical glass processing is filled with polishing agent (solid powder) in the polyurethane matrix, which can increase the grinding force of the material. In order to ensure that the filler can be mixed evenly, the foam material has more open cells. In the preparation process, the viscosity of the reaction system should be well controlled, so that the gel effect should be slightly behind the occurrence of bubbles, but if the viscosity is too low, there will be foam leakage and a large number of co-foaming (giant bubbles), resulting in waste products. At present, "one-step method" and "two-step method" are mainly used to produce polyurethane polishing materials at home and abroad. The reaction viscosity and reaction heat are not easy to control during production, resulting in uneven size of pores an...

AI Technical Summary

Problems solved by technology

During the preparation process, the viscosity of the reaction system should be well controlled, so that the gel effect should be slightly behind the generation of bubbles, but if the viscosity is too low, bubble leakage and a large number of bubbles (giant bubbles) will occur, and waste products will be formed.

At present, the "one-step method" and "two-step method" are mainly used to produce polyurethane polishing materials at home and abroad. The reaction viscosity and reaction heat are not easy to control in the production and manufacturing, resulting in uneven pore size and large changes in the upper and lower densities. Less than 50%

Compared with the one-step method, due to the larger molecular weight distribution, the viscosity of the prepolymer is higher, generally between 1000 and 5000cp.s, the viscosity change makes the production process difficult to control, and the storage conditions after the prepolymer is made High requirements (constant temperature and humidity), the prepolymer is easy to agglomerate and deteriorate during storage, and the finished product rate is less than 70%.

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