A hollow glass microsphere/potassium fluoroaluminate-elastic resin composite particle and its preparation method and application

A technology of hollow glass microspheres and potassium fluoroaluminate, which is applied in grinding/polishing equipment, manufacturing tools, metal processing equipment, etc., can solve problems such as polishing wheel bursting, polishing wheel internal cracks, and harsh resin requirements, and achieve improved Material and process costs, reduced process requirements, beneficial effects on environmental protection

Active Publication Date: 2021-02-02
天津佐源新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, the moisture absorption of the surface layer of the polishing wheel makes the contained moisture penetrate from the surface to the inside. If the polishing wheel is used in winter, once the ambient temperature is below 0°C, the moisture will freeze into ice, causing the volume to increase. , will cause internal cracks in the polishing wheel, which will easily cause the polishing wheel to burst during use, bringing safety hazards
Therefore, although the general water-soluble salt is relatively cheap and easy to form pores, it is inconvenient to store and poses a safety hazard.
[0004] Another way to generate cavities is to add a foaming agent to the resin binder to generate cavities by foaming before the resin is cured, but this type of foaming agent has strict requirements on the resin and is only suitable for polyurethane resin-bonded systems
[0005] Although hollow glass microspheres have been disclosed as pore-forming agents in resin-bonded abrasive tools, because the density of unsaturated polyester resin is about 1.15 g / cm 3 , while the density of hollow glass microspheres is only about 0.1-0.7g / cm 3 , and has a smooth surface and a spherical shape with good fluidity. During the manufacturing process of the abrasive tool, it is inevitable that the resin is in a liquid state. At this stage, the hollow glass microspheres will have a strong floating tendency, which seriously affects the structure of the abrasive tool. homogeneity
This phenomenon is particularly prominent in high-content resin abrasives or cast resin abrasives. Unless the resin content in the abrasive composition is reduced, the amount of abrasive or filler is increased, and the mobility of each component of the abrasive composition is reduced, the abrasive can be realized. It is a multi-component uniform structure, but this will seriously compress the design space of the abrasive tool, thus limiting the application of hollow glass microspheres

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A method for preparing hollow glass microspheres / potassium fluoroaluminate-elastic resin composite particles of the present embodiment comprises the following steps:

[0048] (1) 20g of hollow glass microspheres and 117g of potassium fluoroaluminate are added to 100g of polyurethane. The Shore hardness of polyurethane after solidification is 50HD. The particle diameter of hollow glass microspheres is 250 μm and the wall thickness is 1.5 μm. Stir and use The centrifugal defoaming mixer mixes it evenly to obtain the mixture;

[0049] (2) Cast the mixture into the mold of the rectangular plate, scrape and spread it evenly to form a casting layer with a thickness of 1000×725×0.3mm, and then solidify it at room temperature. Elastic resin sheet, before reaching the peak strength of resin curing within 1-10 hours after curing, mechanically process the sheet into a wire material with a width of about 0.4±0.1mm, and then press the wire material into a length of 0.4±0.1mm After ...

Embodiment 2

[0053] A method for preparing hollow glass microspheres / potassium fluoroaluminate-elastic resin composite particles of the present embodiment comprises the following steps:

[0054] (1) 18g hollow glass microspheres and 115g potassium fluoroaluminate are added in 95g epoxy resin, the Shore hardness after polyurethane curing is 40HD, the particle diameter of hollow glass microspheres is 10 μm, wall thickness 1 μm, stir, Use a centrifugal defoaming mixer to mix it evenly to obtain a mixture;

[0055] (2) Cast the mixture into the mold of the rectangular plate, scrape and spread it evenly to form a casting layer with a thickness of 1000×725×0.3mm, and then solidify it at room temperature. The elastic resin sheet makes the epoxy resin in a gel state, and crushes the particle size to 200 μm to obtain the hollow glass microsphere / potassium fluoroaluminate-elastic resin initial composite particle;

[0056] (3) Carry out heat treatment on the primary composite particles, the heat tre...

Embodiment 3

[0059] (1) 22g hollow glass microspheres and 120g potassium fluoroaluminate are added in 105g epoxy resin, and the Shore hardness after polyurethane curing is 80HD, and the particle diameter of hollow glass microspheres is 300 μm, wall thickness 2 μm, stirs, Use a centrifugal defoaming mixer to mix it evenly to obtain a mixture;

[0060] (2) Cast the mixture into the mold of the rectangular plate, scrape and spread it evenly to form a casting layer with a thickness of 1000×725×0.3mm, and then solidify it at room temperature. The elastic resin sheet makes the epoxy resin in a gel state, and crushes the particle size to 1500 μm to obtain the hollow glass microsphere / potassium fluoroaluminate-elastic resin primary composite particle;

[0061] (3) Carry out heat treatment on the primary composite particles, the heat treatment temperature is 100° C., and the time is 3 hours, to obtain the hollow glass microsphere / potassium fluoroaluminate-elastic resin composite particles.

[0062...

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Abstract

The invention discloses a hollow glass microsphere / potassium fluoroaluminate-elastic resin compound particle and its preparation method and application. The compound particle is based on an elastic resin, and the hollow glass microsphere and potassium fluoroaluminate are uniformly distributed in the In the matrix, the volume of hollow glass microspheres and potassium fluoroaluminate accounts for 30-70% of the total volume of the composite particles, and the volume ratio of hollow glass microspheres to potassium fluoroaluminate is 3-7:7-3 . Due to the relatively coarse particle size of the compound particles, there is a large area of ​​lipophilic elastic resin on the surface, which helps prevent the compound particles from floating in the liquid polishing wheel mixture, and at the same time prevents the heavy particles from settling, improving the The homogeneity of the liquid mixture replaces the existing water-soluble salts and improves the technical performance of the polishing wheel.

Description

technical field [0001] The invention belongs to the technical field of abrasive tools, and in particular relates to a hollow glass microsphere / potassium fluoroaluminate-elastic resin composite particle and a preparation method and application thereof. Background technique [0002] At present, for the grinding / polishing of stone, glass, ceramics and other materials, unsaturated polyester resin bonded polishing wheels are widely used. The bond in the polishing wheel is unsaturated polyester resin, and the abrasives are silicon carbide, aluminum oxide, etc. It is an inert filler and an active filler, using a resin casting molding process. There are various fillers, such as fillers that can help the polishing wheel improve processing performance, enhance the grinding aid or functionality of the resin system; reduce material costs without affecting performance. Inert filler. The fillers in conventional polishing wheels are indispensable to use water-soluble salts, such as sodium...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B24D3/28B24D18/00
Inventor 李珮豪彭波
Owner 天津佐源新材料科技有限公司
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