CN109810485A - Graphite/elastic resin composite grain, its preparation method and the application in production polishing wheel - Google Patents
Graphite/elastic resin composite grain, its preparation method and the application in production polishing wheel Download PDFInfo
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- CN109810485A CN109810485A CN201910084832.9A CN201910084832A CN109810485A CN 109810485 A CN109810485 A CN 109810485A CN 201910084832 A CN201910084832 A CN 201910084832A CN 109810485 A CN109810485 A CN 109810485A
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Abstract
The present invention relates to a kind of graphite/elastic resin composite grain, its preparation method and the applications in production polishing wheel.The polishing wheel mainly includes unsaturated polyester resin, abrasive material, filler and graphite/elastic resin composite grain, wherein the graphite/elastic resin composite grain is made of the elastic resin of graphite and 70~30vol% that percent by volume is 30~70vol%, and composite grain particle size is 200~1500 μm.Graphite/elastic resin composite grain is applied in the preparation of resin finish wheel, obtained resin finish wheel rub resistance, lubrication and excellent heat dissipation performance, processing quality and service life are improved, and solve the problems, such as that lubrication and heat dissipation effect are bad when the processing of resin finish wheel.
Description
Technical field
The invention belongs to Material Fields, and in particular to a kind of graphite/elastic resin composite grain, its preparation method and in production polishing wheel
Application.
Background technique
Currently to grinding/polishing of the materials such as stone material, glass, ceramics, the throwing of unsaturated polyester resin bonding agent is widely used
Halo, the polishing wheel includes the unsaturated polyester resin as bonding agent, as hard such as the silicon carbide of abrasive material or aluminium oxide
Abrasive material and various inertia/grinding aid filler.Since unsaturated polyester resin is liquid resin in raw material composition, poured using resin
Therefore type casting moulding technique is also referred to as used as casting type resin finish wheel.
Filling kind used in this kind of polishing wheel is varied, including polishing wheel can be helped to improve processing performance, enhancing
The grinding aid of resin system or functional filler, and the inert filler of reduction material cost under the premise of performance is not influenced.
In the resin bond wheel made with pressure sintering, Powdered phenolic resins etc. and abrasive material and solid particle are commonly used
Filler constitutes uniform mixture by mixing, mixture is launched in mold, by the solidification of cold pressing-heating, direct hot pressing
Technique constitutes resin wheel.In this kind of heat reactive resin grinding wheel, it is known that technology is through common graphite as lubricity/thermal diffusivity
Filler effectively reduces grinding/polishing interface heat, improves the frictional behavior of resin wheel in grinding or polishing, into
And improve service life and the efficiency of resin wheel.
But graphite-like filler may not apply to unsaturated polyester (UP) tree although using well in hot-press resin grinding wheel
Resin system, the main reason is that graphite type material, has polymerization inhibitor effect to unsaturated polyester (UP), prevent it from solidifying.Therefore, it adds
Quantity be only limitted to 0.5vol% hereinafter, the quantity pitch-based sphere, be not enough to play lubrication/heat dissipation effect in grinding-polishing.
Therefore, in terms of unsaturated polyester resin polishing wheel, the effective practical side of offer lubrication/heat-releasing filler is also lacked
Method.
Summary of the invention
It is of the existing technology in order to solve the problems, such as, the present invention provides a kind of graphite/elastic resin composite grain, its preparation method and
Application in production polishing wheel.Graphite is substituted using the graphite/elastic resin composite grain, is used in unsaturated polyester resin
In the polishing wheel of bonding agent preparation, the problem that existing resin finish wheel lubricates and heat dissipation effect is bad can effectively solve.
The solution of the present invention is to provide a kind of graphite/elastic resin composite grain, is grouped as by the group of following percent by volume:
The graphite of 30~70vol% and the elastic resin of 70~30vol%.
Verify through inventor, when graphite accounts for composite grain total volume lower than 30%, be applied in polishing wheel repeatedly, lubrication and
Heat dissipation effect is unobvious；When graphite accounts for composite grain total volume higher than 70%, then it is excessively high to will lead to composite grain surface graphite exposure ratio,
So that it is subsequent prepare unsaturated polyester (UP) polishing wheel when inhibition is caused to it.Therefore when using above-mentioned graphite levels range, stone
Black energy large area is embedded by elastic resin, to the underaction of unsaturated polyester (UP) to generate polymerization inhibitor, and lubricates excellent in heat dissipation effect.
Wherein, the graphite type material is carbon black, natural flake graphite or graphene.
Wherein, the elastic resin is two ingredient elastic polyurethane or two ingredient elastic epoxy resin.
The present invention provides a kind of preparation method of graphite/elastic resin composite grain again, includes the following steps:
(1) graphite is mixed with elastic resin performed polymer homogeneous, obtains mixture a；
(2) mixture a obtained by step (1) is subjected to casting solidification, after graphite/elastic resin composite material；
(3) graphite obtained by step (2)/elastic resin composite material is crushed, obtains graphite/elastic resin composite grain.
Preferably, in step (1), the granularity of graphite is 1~200 μm.
Preferably, in step (1), the graphite is carbon black, natural flake graphite or graphene.
Preferably, in step (1), the elastic resin is thermosetting resin.Uncured elastic resin is in liquid at normal temperature
State comprising liquid elastomer polyurethane, liquid elastomer epoxy resin etc., and can solidify under normal temperature conditions.
Preferably, in step (2), the cured temperature is 25~60 DEG C；Curing time is 0.5~10h.
Preferably, in step (2), elastic resin shore hardness is 40~80HD after the solidification.
Preferably, in step (3), the granularity that is crushed to is 200~1500 μm.Wherein, it is emphasized that the stone
Ink/elastic composite grain scale particle size is 200~1500 μm and refers to that composite grain cross-sectional maximum dimension is 200~1500 μm, and particle can be with
It is in the form of a column, strip, triangular pyramid, hexahedron or various irregular shapes, can also be single shape or mixing shape.
It is verified repeatedly through inventor, when graphite/elastic resin composite grain size is lower than 200 μm, on the one hand can improve processing
On the other hand difficulty will also increase graphite in the exposing area on composite grain surface；And when graphite/elastic resin composite grain size is higher than
At 1500 μm, then it will affect it in the evenly dispersed degree of polishing wheel surface, weaken lubrication and heat dissipation effect.
The present invention also provides a kind of application of graphite/elastic resin composite grain in production polishing wheel.
The present invention continues to provide a kind of preparation method of polishing wheel, includes the following steps:
(i) graphite/elastic resin composite grain, abrasive material, filler and unsaturated polyester resin are mixed and carries out homogeneous, obtain mixture
A；
(ii) curing agent is added in the mixture A obtained by step (i) and promotor mixes again, carry out casting and be solidified into
Type is to get polishing wheel.
Preferably, the graphite/elastic resin composite grain, abrasive material, filler, unsaturated polyester resin, curing agent and promotor
Weight ratio be 1:1.5~2.5:1.5~2.5:6~7:0.08~0.12:0.08~0.12.
Wherein, unsaturated polyester resin bonding agent used in invention polishing wheel can be conventional use of any type.
It is known that unsaturated polyester resin is a kind of liquid mixture of viscous, dissolved by the unsaturated monomer to polyester cross-linking
Unsaturated polyester (UP) obtains, such as styrene.By the way that known peroxide initiator or mistake are presented in unsaturated polyester resin
The combination and solidification of peroxide initiator and curing accelerator can produce cure unsaturated polyester resins.Solidification tree produced
Rouge has opened up extremely wide purposes.Unsaturated polyester (UP) generally passes through α, β-unsaturated dibasic acid such as maleic anhydride, fumaric acid, clothing
Prepared by health acid etc., the condensation reaction with glycol such as ethylene glycol, diethylene glycol (DEG), propylene glycol, neopentyl glycol etc., the molecular weight of condensate
Preferably 1000~3000.When using unsaturated monomer to unsaturated polyester cross-linking, what is shared is usually vinyl-type monomer, example
Such as styrene, vinyltoluene, divinylbenzene, vinyl acetate, acrylate, especially preferably styrene.For
The unsaturated polyester (UP) of crosslinking and the mixture of unsaturated monomer are a kind of water-insoluble resinite oily mixtures, general mixed
Composition and division in a proportion example is 80:20~30:70, this is referred to as uncured unsaturated polyester resin.Conventional standard brand has 191 unsaturations poly-
Ester resin, 196 unsaturated polyester resins etc..
Wherein, the abrasive material is aloxite (AI2O3), silicon carbide, diamond, corundum, garnet or glass powder；The grain of abrasive material
It spends depending on specific requirement such as material removal amount, surface roughness and brightness to polish, granularity is 5~400 μm.
Wherein, the filler is the system of all various packing materials in polishing wheel other than resinoid bond and abrasive material
Claim, filler includes improving polishing performance, the grinding aid of reinforced resin system or functional filler, and do not influence performance premise
The lower inert filler for reducing material cost.Filler be concretely in the mica of solid granular, quartz, titanium dioxide, ice crystal,
Feldspar cerussite, olivine, gypsum, clay, calcium carbonate, dolomite, aluminium hydroxide or silica also can be water soluble salt
Sodium chloride, potassium chloride, potassium sulfate or sodium sulphate.
It is emphasized that when graphite/elastic resin composite grain is added into the mixture of polishing wheel, due to elastic resin
Thermosetting characteristics, making it is not in the plastic deformation and secondary fusion phenomenon that thermoplastic resin easily occurs under heating condition,
It thus avoids in polishing wheel manufacturing process, when there is 110~130 DEG C of peak temperature in unsaturated polyester resin, graphite/
The case where elastic resin composite grain fuse itself deforms.
For whole design and invention thinking, preparing elastic resin shore hardness used in composite grain is 40~80HD, and
Making unsaturated polyester resin shore hardness used in polishing wheel is 95~100HD.Use the discrepant two-phase tree of hardness
Rouge, can be used for adjusting the elasticity modulus of polishing wheel overall surface, then adjust and improve polishing wheel in high speed rotation stress
Ability of anti-deformation and biddability to workpiece surface.It is combined by the resin for having differences hardness, has both improved polishing
The mechanical property of wheel, and solve the technical issues of polishing wheel in the prior art lacks lubrication and heat dissipation.
The invention has the benefit that
Graphite of the present invention/elastic resin composite grain, in the higher situation of graphite-phase content, elastic resin is mutually remained to
The embedding that large area is carried out to graphite-phase, not will lead to graphite-phase and comes across composite grain boundary layer, thus using the graphite/elasticity
Resin composite grain substitution graphite can effectively solve graphite in the polishing wheel prepared using unsaturated polyester resin as primary raw material
Polymerization inhibitor effect, rub resistance, lubrication and the heat dissipation performance of obtained resin finish wheel can be led to the problem of to unsaturated polyester resin
It is good, furthermore, utilize elastic resin (shore hardness is 40~80HD) and unsaturated polyester resin (shore hardness is 95~100HD)
Between existing nonhomogeneous hardness, be conducive to adjust polishing wheel overall surface elasticity modulus, then adjust and improve polishing wheel
Ability of anti-deformation in high speed rotation stress and the biddability of workpiece surface, processing quality and service life are changed
It is kind.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, technical solution of the present invention will be carried out below
Detailed description.Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art are obtained all without making creative work
Other embodiment belongs to the range that the present invention is protected.
Embodiment 1
The present embodiment provides a kind of graphite/elastic resin composite grain preparation methods, include the following steps:
It (1) is 100 μm by 935g granularity, density 2.15g/cm3Natural flake graphite and the trade mark be the double of HC-8350
The commercially available elastic polyurethane prepolymer mixing of component, wherein component A, B component are that 250g obtains mixture a after homogeneous mixing；
(2) mixture a obtained by step (1) is poured into rectangular disk, scrapes and divide uniformly, constitutes the casting with a thickness of 0.3mm
Layer, solidify 10h under the conditions of 25 DEG C, after graphite/elastic resin composite material；
(3) graphite/elastic resin composite processing obtained by step (2) is gone out into the wire material that width is 300~500 μm,
Wire material is then processed into particle by 300~500 μm of length to get in hexahedral graphite/elastic resin composite grain again.
After testing, graphite of the total volume 50% in gained graphite/elastic resin composite grain, composite grain density are 1.65g/
cm3, the shore hardness of elastic resin is 50HD.
The present embodiment also provides a kind of preparation method of resin finish wheel, includes the following steps:
(i) by 150g graphite/elastic resin composite grain, the silicon carbide that 300g granularity is 7 μm, the lightweight that 200g granularity is 20 μm
The unsaturated polyester resin that calcium carbonate, the sodium chloride that 100g granularity is 200 μm and the 1000g trade mark are 191 uniformly mixes, and must mix
Object A；
(ii) 15g curing agent methyl ethyl ketone peroxide and 15g promotor aphthenic acids are added into mixture A obtained by step (i)
Cobalt, and cast molding obtain outer diameter 165mm, center bore 25mm and the polishing wheel with a thickness of 10mm.
Embodiment 2
The present embodiment provides a kind of graphite/elastic resin composite grain preparation methods, include the following steps:
It (1) is 200 μm by 560g granularity, density 2.10g/cm3Graphene and the trade mark be HC-8350 two-component city
The mixing of elastic polyurethane prepolymer is sold, wherein component A, B component are that 435g obtains mixture a after homogeneous mixing；
(2) mixture a obtained by step (1) is poured into rectangular disk, scrapes and divide uniformly, constitutes the casting with a thickness of 0.3mm
Layer, solidify 0.5h under the conditions of 60 DEG C, after graphite/elastic resin composite material；
(3) graphite/elastic resin composite processing obtained by step (2) is gone out into the wire rod that width is 1300~1500 μm
Material, then processes particle by 1300~1500 μm of length by wire material again to get graphite/elastic resin composite grain.
After testing, graphite of the total volume 30% in gained graphite/elastic resin composite grain, composite grain density are 1.55g/
cm3, the shore hardness of elastic resin is 40HD.
The present embodiment also provides a kind of preparation method of resin finish wheel, includes the following steps:
(i) by 150g graphite/elastic resin composite grain, the corundum that 225g granularity is 7 μm, the hydroxide that 250g granularity is 20 μm
The unsaturated polyester resin that aluminium, the potassium sulfate that 125g granularity is 200 μm and the 900g trade mark are 191 uniformly mixes, and obtains mixture A；
(ii) 18g curing agent methyl ethyl ketone peroxide and 12g promotor aphthenic acids are added into mixture A obtained by step (i)
Cobalt, and cast molding obtain outer diameter 165mm, center bore 25mm and the polishing wheel with a thickness of 10mm.
Embodiment 3
The present embodiment provides a kind of graphite/elastic resin composite grain preparation methods, include the following steps:
It (1) is 1 μm by 1300g granularity, density 2.23g/cm3Carbon black and the trade mark be HC-8350 two-component it is commercially available
The mixing of elastic polyurethane prepolymer, wherein component A, B component are that 68g obtains mixture a after homogeneous mixing；
(2) mixture a obtained by step (1) is poured into rectangular disk, scrapes and divide uniformly, constitutes the casting with a thickness of 0.3mm
Layer, solidify 5h under the conditions of 40 DEG C, after graphite/elastic resin composite material；
(3) graphite/elastic resin composite processing obtained by step (2) is gone out into the wire material that width is 200~250 μm,
Wire material is then processed into particle by 200~250 μm of length to get graphite/elastic resin composite grain again.
After testing, graphite of the total volume 70% in gained graphite/elastic resin composite grain, composite grain density are 1.75g/
cm3, the shore hardness of elastic resin is 80HD.
The present embodiment also provides a kind of preparation method of resin finish wheel, includes the following steps:
(i) by 150g graphite/elastic resin composite grain, the glass powder that 375g granularity is 7 μm, the dioxy that 160g granularity is 20 μm
The unsaturated polyester resin that SiClx, the sodium sulphate that 90g granularity is 200 μm and the 1050g trade mark are 191 uniformly mixes, and obtains mixture
A；
(ii) 12g curing agent methyl ethyl ketone peroxide and 18g promotor aphthenic acids are added into mixture A obtained by step (i)
Cobalt, and cast molding obtain outer diameter 165mm, center bore 25mm and the polishing wheel with a thickness of 10mm.
Comparative example 1
This comparative example provides a kind of preparation method of resin finish wheel, the difference from embodiment 1 is that, by embodiment 1
In graphite/elastic resin composite grain replace with 240g precipitated calcium carbonate, remaining operation is constant.
Application examples
Embodiment 1 and the resulting polishing wheel of comparative example 1 are coaxially mounted on stone grinding machine, conventional throwing is carried out to marble
Light, to verify the performance of two kinds of polishing wheels.
Detection method:
20m is amounted to marmorean grinding length, it is contemplated that 5m is in running-in period before being ground, and wheel has failed with stone surface
Full connected, therefore surface gloss inspection is carried out to the marble of rear 15m；Then measurement polishing wheel diameter, estimates polishing wheel
Wearability.
Testing result:
After marble surface natural air drying wait be polished, with YG268 high-precision vancometer, ten are carried out to polishing back segment
Point sampling measure glossiness, be averaged to ten point datas, glossiness measured data the result shows that, obtained by embodiment 1 polishing
The polishing effect of wheel is better than 1 gained polishing wheel of comparative example.
Polishing wheel diameter obtained by embodiment 1 and comparative example 1 is measured respectively, measurement result shows 1 gained of embodiment
The relative wear amount of polishing wheel is lower than the abrasion loss of 1 gained polishing wheel of comparative example.
To sum up conclude, is added to graphite/elastic resin composite grain polishing wheel, processing quality and service life are changed
It is kind.
In addition, it has also been found that, since polishing wheel frictional property is improved, significantly reducing the polishing phase in practical polishing process
Between the noise that occurs, this is extremely advantageous to working environment is improved.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (10)
1. a kind of graphite/elastic resin composite grain, which is characterized in that be grouped as by the group of following percent by volume: 30~70vol%
Graphite and 70~30vol% elastic resin.
2. graphite described in claim 1/elastic resin composite grain preparation method, which comprises the steps of:
(1) graphite is mixed with elastic resin performed polymer homogeneous, obtains mixture a；
(2) mixture a obtained by step (1) is subjected to casting solidification, after graphite/elastic resin composite material；
(3) graphite obtained by step (2)/elastic resin composite material is crushed, obtains graphite/elastic resin composite grain.
3. graphite according to claim 2/elastic resin composite grain preparation method, which is characterized in that in step (1), institute
The granularity for stating graphite is 1~200 μm.
4. graphite according to claim 2/elastic resin composite grain preparation method, which is characterized in that in step (1), institute
Stating graphite is carbon black, natural flake graphite or graphene.
5. graphite according to claim 2/elastic resin composite grain preparation method, which is characterized in that in step (1), institute
Stating elastic resin is thermosetting resin.
6. graphite according to claim 2/elastic resin composite grain preparation method, which is characterized in that in step (2), institute
Stating cured temperature is 25~60 DEG C；Curing time is 0.5~10h.
7. graphite according to claim 2/elastic resin composite grain preparation method, which is characterized in that in step (2), institute
Elastic resin shore hardness is 40~80HD after stating solidification.
8. graphite according to claim 2/elastic resin composite grain preparation method, which is characterized in that in step (3), institute
Stating and being crushed to granularity is 200~1500 μm.
9. application of the graphite described in claim 1/elastic resin composite grain in production polishing wheel.
10. the preparation method of polishing wheel as claimed in claim 9, which comprises the steps of:
(i) graphite/elastic resin composite grain, abrasive material, filler and unsaturated polyester resin are mixed and carries out homogeneous, obtain mixture A；
(ii) curing agent is added into mixture A obtained by step (i) and promotor mixes again, carry out casting curing molding, i.e.,
Obtain polishing wheel.
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| CN201910084832.9A CN109810485B (en) | 2019-01-29 | 2019-01-29 | Graphite/elastic resin composite particle, preparation method thereof and application thereof in manufacturing polishing wheel |
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Cited By (1)
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| CN109810485B (en) | 2022-04-15 |
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