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Preparation method of polyurethane polishing material

A polishing material and a manufacturing method technology, applied in the manufacturing field of polyurethane polishing materials, can solve the problems of high storage condition requirements, large viscosity change, uneven pore size, etc., and achieve good production repeatability, improved yield and improved cutting rate Effect

Active Publication Date: 2013-10-02
HEFEI HONGGUANG ABRASIVE SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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%.

Method used

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  • Preparation method of polyurethane polishing material
  • Preparation method of polyurethane polishing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The present embodiment provides a kind of manufacture method of polyurethane polishing material, comprises the following steps:

[0021] a. Rapid prepolymerization: heat diisocyanate and polyether polyol in a reaction kettle and stir to make it react rapidly for 6-8 minutes at a temperature of 60-65°C to make a viscosity of 1600-1800cp.s / 25°C Prepolymers containing terminal isocyanate groups;

[0022] b. Rapid chain extension: add chain extender to the above prepolymer and mix at high speed, and stir for 2-3 minutes at a temperature of 85-90°C to make a carbamate with a viscosity of 2600-3000cp.s / 25°C liquid;

[0023] c. Rapid foaming: Add filler, water and additives to the above liquid, keep the temperature at 110-115°C, then stir at high speed for 10-25 seconds, then quickly pour the material into the foaming mold, and put it in an oven at 115-120°C heating for more than 16 hours,

[0024] Wherein the total amount of the diisocyanate is 24kg, including toluene diis...

Embodiment 2

[0026] The present embodiment provides a kind of manufacture method of polyurethane polishing material, comprises the following steps:

[0027] a. Rapid prepolymerization: heat diisocyanate and polyether polyol in a reaction kettle, and stir to make it react rapidly for 6-8 minutes, the temperature is 65-75°C, and the viscosity is 1600-1800cp.s / 25°C Prepolymers containing terminal isocyanate groups;

[0028] b. Rapid chain extension: add chain extender to the above prepolymer and mix at high speed, and stir for 2-3 minutes at a temperature of 85-90°C to make a carbamate with a viscosity of 2600-3000cp.s / 25°C liquid;

[0029] c. Rapid foaming: Add filler, water and additives to the above liquid, keep the temperature at 110-115°C, then stir at high speed for 10-25 seconds, then quickly pour the material into the foaming mold, and put it in an oven at 115-120°C heating for more than 16 hours,

[0030] Other various parameters, raw material composition are identical with embodi...

Embodiment 3

[0032] The present embodiment provides a kind of manufacture method of polyurethane polishing material, comprises the following steps:

[0033] a. Rapid prepolymerization: heat diisocyanate and polyether polyol in a reaction kettle and stir to make it react rapidly for 10-12 minutes at a temperature of 65-75°C to make a viscosity of 1600-1800cp.s / 25°C Prepolymers containing terminal isocyanate groups;

[0034] b. Rapid chain extension: add a chain extender to the above prepolymer and mix at high speed, and stir for 2 to 3 minutes at a temperature of 87 to 90°C to make a carbamate with a viscosity of 2600 to 3000cp.s / 25°C liquid;

[0035] c. Rapid foaming: Add filler, water and additives to the above liquid, keep the temperature at 110-115°C, then stir at high speed for 10-25 seconds, then quickly pour the material into the foaming mold, and put it in an oven at 115-120°C heating for more than 16 hours,

[0036] Wherein the total amount of the diisocyanate is 26kg, including...

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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 polyurethane polishing material. Background technique [0002] The polyurethane polishing sheet used in optical glass processing is filled with a 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 porosity. 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, resul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/32C08G18/10C08J9/08
Inventor 孔维洪
Owner HEFEI HONGGUANG ABRASIVE SCI & TECH
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