CN103522209B - A kind of resin wheel - Google Patents
A kind of resin wheel Download PDFInfo
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- CN103522209B CN103522209B CN201310533268.7A CN201310533268A CN103522209B CN 103522209 B CN103522209 B CN 103522209B CN 201310533268 A CN201310533268 A CN 201310533268A CN 103522209 B CN103522209 B CN 103522209B
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Abstract
The invention provides a kind of resin wheel, including: abrasive material, phenolic resin, coagent and wetting agent, described coagent is methylolated lignin.Resin wheel provided by the invention, using hydroxylated lignin as coagent, in the preparation process of resin wheel, participation resin solidifies, and make solidfied material form microcellular structure when resin solidifies, thus increasing the pore ratio of resin wheel, thus there is higher Nai Qiedu and cutting efficiency.
Description
Technical field
The invention belongs to grinding materials and grinding tool technical field, particularly relate to a kind of resin wheel.
Background technology
There are the circular bonded abrasive tool of through hole in the central authorities that emery wheel abrasive material and bonding agent mixing are made through pressed compact, dry, roasting.Emery wheel is the one that in grinding tool, consumption is maximum, use face is the widest, high speed rotating during use, can the cylindrical of workpiece, inner circle, plane and various profiles etc. be roughly ground, the mach instrument of the mode such as half fine grinding, fine grinding, fluting and cut-out.
Emery wheel is according to the variety classes of bonding agent, it is possible to be divided into resin wheel, elastic grinding wheel, metal wheel, vitrified abrasive, electricity coating emery wheel and single-layer metal coating emery wheel.This wherein resin wheel be with phenolic resin, epoxy resin, polyurethane resin, the emery wheel that polyvinyl alcohol resin etc. is made as bonding agent.Resin wheel has a feature such as intensity height, elastic big, shock-resistant, robustness, but poor heat resistance and the porosity is little etc. that shortcoming have impact on emery wheel application in actual production.
Pore is one of three big key elements determining resin wheel key property, has very important effect in resin wheel organizational structure.Resin wheel is after manufacturing molding, it is necessary to has desirable pore ratio, can ensure that emery wheel has higher cutting efficiency and relatively low grinding ratio when grinding.Interior tissue is closeer, the resin wheel that pore ratio is less, and cutting edge spacing distance is also less, and emery wheel is easily blocked by abrasive dust, causes wheel grinding power to increase, and caloric value is big, even burns part, and causes too early the crushing and come off of abrasive material, makes grinding ratio reduce.In actual use, it is necessary to repair to recover grinding performance and correct geometry to it frequently.
In prior art, the method increasing resin wheel pore is mainly chosen the abrasive material of different model or adds inorganic fillers when compacting emery wheel idiosome.Such as a kind of resin wheel and preparation method thereof disclosed in patent 2011103292351, this resin wheel disclosed in it includes grinding body and is placed in strengthen the reinforced sheet of described grinding body revolving strength inside described grinding body, and material composition and the weight proportion thereof of its abrasive body are as follows: 140～200 parts of abrasive material, phenol-formaldehyde resin powder 50～65 parts, liquid phenolic resin 10～20 parts, calcium lime powder 10～20 parts, troilite powder 12～25 parts, cryolite powder 5～10 parts.Preparation method is, is first put into by abrasive material in liquid phenolic resin and infiltrates, then by all the other dispensings by with infiltration after abrasive material Homogeneous phase mixing after sieve, be then placed in mould curing molding, finally dry and obtain resin wheel finished product.
But the above-mentioned this method by adding inorganic fillers increase resin wheel pore ratio, the ratio of inorganic fillers is very few, and pore ratio is less, and the ratio of inorganic fillers is too much, then can cause that wheel strength reduces, and grinding capacity declines.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is in that to provide a kind of resin wheel, and resin wheel provided by the invention has higher pore ratio, thus has higher Nai Qiedu and cutting efficiency.
The invention discloses a kind of resin wheel, it is characterised in that include abrasive material, phenolic resin, coagent and wetting agent；
Described coagent is methylolated lignin.
Preferably, described lignin is alkali lignin, calcium lignosulfonate or sodium lignin sulfonate.
Preferably, the mass ratio of described abrasive material, coagent, wetting agent and phenolic resin is (3～6): (0.05～0.15): (0.4～0.6): 1.
Preferably, inorganic filler is also included；
Described inorganic filler is iron sulfide and cryolite.
Preferably, the mass ratio of described iron sulfide, cryolite and phenolic resin is (0.8～1.1): (0.15～0.35): 1.
Preferably, described methylolated lignin is prepared by the following method:
A) lignin liquor is obtained with alkali liquor after being mixed by lignin；
B) in above-mentioned lignin liquor, add aldehyde compound, temperature reaction, precipitate out methylolated lignin；
Described alkali liquor is sodium hydroxide solution, potassium hydroxide solution, rubidium hydroxide solution or cesium hydroxide solution.
Preferably, described lignin is (0.1～0.3) with the mass ratio of alkali liquor: 1.
Preferably, described aldehyde compound includes one or more in formaldehyde, acetaldehyde, furfural, paraformaldehyde and metaformaldehyde.
Preferably, the mass concentration of described alkali liquor is 1～2%.
Preferably, the temperature of described intensification is 85～95 DEG C.
The invention discloses a kind of resin wheel, it is characterised in that include abrasive material, phenolic resin, coagent and wetting agent；Described coagent is methylolated lignin.Compared with prior art, resin wheel provided by the invention, using hydroxylated lignin as coagent, in the preparation process of resin wheel, participation resin solidifies, and makes solidfied material form microcellular structure when resin solidifies, thus increasing the pore ratio of resin wheel.Test result indicate that, resin wheel provided by the invention, Nai Qiedu improves 3%, and cutting efficiency improves 16%, and the revolving strength of resin wheel improves 2～3%.
Accompanying drawing explanation
Fig. 1 is the cross sectional photograph of phenolic resin curing thing A in the embodiment of the present invention 7；
Fig. 2 is the cross sectional photograph of phenolic resin curing thing B in the embodiment of the present invention 7；
Fig. 3 is the cross sectional photograph of phenolic resin curing thing C in the embodiment of the present invention 7；
Fig. 4 is the cross sectional photograph of phenolic resin curing thing D in the embodiment of the present invention 7.
Detailed description of the invention
In order to be further appreciated by the present invention, below in conjunction with embodiment, the preferred embodiment of the invention is described, but it is to be understood that these describe to be intended merely to and further illustrate the features and advantages of the present invention, rather than the restriction to invention claim.
The invention discloses a kind of resin wheel, it is characterised in that include abrasive material, phenolic resin, coagent and wetting agent；
Described coagent is methylolated lignin.
Resin wheel provided by the invention, using methylolated lignin as coagent, improves pore ratio in resin wheel, thus has higher Nai Qiedu and cutting efficiency.
The present invention is raw materials used, its source is not particularly limited, commercially buys.
In resin wheel of the present invention, including abrasive material and phenolic resin；The present invention selects phenolic resin as bonding agent, described phenolic resin is not particularly limited by the present invention, with the phenolic resin as resin wheel bonding agent well known to those skilled in the art, it is preferably thermoplastic phenolic resin powder, it is more preferably emery wheel phenol-formaldehyde resin powder (Shandong Shengquan Chemical Industry Co., Ltd., PF-2801A).Described abrasive material is not particularly limited by the present invention, with the abrasive material as resin wheel well known to those skilled in the art, it is preferred to diamond, carborundum, Brown Alundum or white fused alumina, more preferably Brown Alundum or carborundum.The mass ratio of described abrasive material and phenolic resin is preferably (3～6): 1, more preferably (4～5): 1.
In resin wheel of the present invention, phenolic resin and abrasive material are main raw materials of preparing, and phenolic resin is commonly used abrasive binder, have good acid resistance, mechanical property, heat resistance.Abrasive material is the main matter that resin wheel is responsible for cutting, possesses higher hardness, good thermostability and toughness, it is preferred that Brown Alundum or carborundum have general representativeness.
In resin wheel of the present invention, including wetting agent；The mass ratio of described wetting agent with phenolic resin is preferably (0.4～0.6) by the present invention: 1, more preferably (0.45～0.55): 1；Wetting agent is not particularly limited by the present invention, with the wetting agent as resin wheel well known to those skilled in the art, it is preferred to thermosetting phenolic resin, more preferably emery wheel wetting agent PF-2550(Shandong holy well chemical industry).In resin wheel of the present invention, wetting agent can make abrasive material moistening, improves cohesive force simultaneously and makes thermoplastic phenolic resin powder adhere to the surface of abrasive particle, advantageously in molding, and keeps the intensity of blank, and after hardening or a part for bonding agent.
In resin wheel of the present invention, including coagent；Coagent of the present invention is methylolated lignin；The mass ratio of described methylolated lignin and phenolic resin is preferably (0.05～0.15): 1, more preferably (0.08～0.12): 1；Described lignin is preferably alkali lignin, calcium lignosulfonate or sodium lignin sulfonate, more preferably alkali lignin or calcium lignosulfonate.
The source of lignin is not particularly limited by the present invention, obtains with lignin preparation method well known to those skilled in the art or is commercially available.The methylolation process of lignin is not particularly limited by the present invention, and detailed process preferably sequentially includes the following steps:
First lignin liquor is obtained with alkali liquor after being mixed by lignin；Described lignin is preferably alkali lignin, calcium lignosulfonate or sodium lignin sulfonate, more preferably alkali lignin or calcium lignosulfonate；It is sodium hydroxide solution, potassium hydroxide solution, rubidium hydroxide solution or cesium hydroxide solution that described alkali liquor is preferably alkali liquor, more preferably sodium hydroxide solution and potassium hydroxide solution；The mass ratio of described lignin and alkali liquor is preferably (0.1～0.3): 1, more preferably (0.15～0.25): 1；The mass concentration of described alkali liquor is preferably 1%～2%, more preferably 1.25%～1.75%.Described mixing is not particularly limited by the present invention, it is preferred to be dissolved completely in alkali liquor by lignin；The condition of described mixing is not particularly limited by the present invention, with mixing condition well known to those skilled in the art；The device of described mixing is not particularly limited by the present invention, mixing arrangement well known to those skilled in the art；The purity of described lignin is not particularly limited by the present invention, with conventional purity requirement well known to those skilled in the art.
The present invention adds aldehyde compound, temperature reaction to above-mentioned lignin liquor, precipitates out methylolated lignin；Described aldehyde compound is preferably one or more in formaldehyde, acetaldehyde, furfural, paraformaldehyde and metaformaldehyde, more preferably formaldehyde, furfural or metaformaldehyde；In described temperature reaction, the temperature of intensification is preferably 85～95 DEG C, more preferably 87～93 DEG C.Reaction end is not particularly limited by the present invention, it is preferred to when methylolated lignin solid precipitates out in a large number, as reaction end；The pH value of reaction is not particularly limited by the present invention, it is preferred to pH is be more than or equal to 7；Other conditions of reaction are not particularly limited by the present invention, with the condition of lignin hydroxymethylation well known to those skilled in the art.
Well known to those skilled in the art, the hydroxymethylation of lignin is that lignin is modified, and improves its activity；Lignin, under the catalytic action of alkali, can carry out electrophilic addition reaction with aldehyde compound, introduces methylol, thus improve activity on phenyl ring.The dissolubility of methylolated lignin reduces with pH value and reduces simultaneously, thus the hydroxymethylation of lignin is usually by adding acid for adjusting pH value less than or equal to 3, makes methylolated lignin precipitate out.And in the present invention, the pH value not regulating reaction solution is acidity, it is made to precipitate out in the basic conditions, make lignin and aldehyde compound overreaction, increase the condensation level of lignin and aldehyde compound, lignin molecule introduces more methylol, further improves the activity of lignin.
The present invention is after obtaining methylolated lignin, it is preferable that it is carried out post processing, and detailed process carries out according to following steps:
It is centrifuged the above-mentioned reaction solution having precipitated out hydroxylated lignin solid separating, drying, obtains the hydroxylated lignin dried；Again above-mentioned dry hydroxylated lignin is pulverized, finally give the hydroxylated lignin of powdery.Described baking temperature is preferably 30～60 DEG C, more preferably 40～50 DEG C；Described drying time is preferably 6～10 hours, more preferably 7～9 hours；The granularity of the hydroxylated lignin of described powdery is preferably 150～250 orders, more preferably 180～220 orders.The condition of described centrifugation is not particularly limited by the present invention, with centrifugation condition well known to those skilled in the art；The equipment of described centrifugation is not particularly limited by the present invention, with centrifugal separation equipment well known to those skilled in the art；Described dry equipment is not particularly limited by the present invention, with drying equipment well known to those skilled in the art；The equipment of described pulverizing is not particularly limited by the present invention, with disintegrating apparatus well known to those skilled in the art.
In resin wheel of the present invention, it is preferable that also include inorganic filler；Described inorganic filler is preferably iron sulfide and cryolite；The mass ratio of described iron sulfide and phenolic resin is preferably (0.8～1.1): 1, more preferably (0.9～1.0): 1；The mass ratio of described cryolite and phenolic resin is preferably (0.15～0.35): 1, more preferably (0.2～0.3): 1.In resin wheel of the present invention, it is preferable that iron sulfide improves the thermostability of resin wheel as inorganic filler.Iron sulfide is when resin wheel grinding, it is possible to effectively reduce the temperature of resin wheel, improves the thermostability of resin wheel, thus extending the service life of resin wheel.In resin wheel of the present invention, it is preferable that cryolite, as inorganic filler, improves the wearability of resin wheel.Cryolite is when resin wheel grinding, it is possible to the effective overall wear resistance improving resin wheel, thus extending the service life of resin wheel.
By reactive resin emery wheel auxiliary agent provided by the invention and emery wheel phenol-formaldehyde resin powder (Shandong Shengquan Chemical Industry Co., Ltd., PF-2801A) proportionally after mix homogeneously, carry out solidification and obtain phenolic resin curing thing, with the emery wheel phenol-formaldehyde resin powder (Shandong Shengquan Chemical Industry Co., Ltd. not adding reactive resin emery wheel auxiliary agent, PF-2801A) the phenolic resin curing thing obtained after solidifying compares, the section of above two phenolic resin curing thing is observed, can significantly find out that the phenolic resin curing thing adding reactive resin emery wheel auxiliary agent has higher pore ratio.
The grinding performance of resin wheel provided by the invention being tested, test result indicate that, resin wheel provided by the invention, Nai Qiedu improves 3%, and cutting efficiency improves 16%, and the revolving strength of resin wheel improves 2～3%.
In order to be further appreciated by the present invention, below in conjunction with embodiment, resin wheel provided by the invention being illustrated, protection scope of the present invention is not limited by the following examples.
Comparative example 1
By the 36# Brown Alundum of 1000g, 120g emery wheel wetting agent (Shandong Shengquan Chemical Industry Co., Ltd., PF-2550), 240g phenol-formaldehyde resin powder, 220g iron sulfide and 60g cryolite through batch mixing compressing, obtain resin wheel blank (Φ=400mm)；Resin wheel blank is hardened according to cure profile, prepares resin wheel 1.
Above-mentioned emery wheel 1 carries out grinding performance test, and the six-edged steel (straight carbon steel) of cutting Φ 32mm, after cutting ten cuttves, its revolving strength (break line speed) is 74.39m/s, and after cutting, emery wheel residual diameter is 378mm, and cutting efficiency (average cut time) is 7.9s.
Comparative example 2
By the 36# carborundum of 1000g, 120g emery wheel wetting agent (Shandong Shengquan Chemical Industry Co., Ltd., PF-2550), 240g phenol-formaldehyde resin powder, 220g iron sulfide and 60g cryolite through batch mixing compressing, obtain resin wheel blank (Φ=400mm)；Resin wheel blank is hardened according to cure profile, prepares resin wheel 2.
Above-mentioned emery wheel 1 carries out grinding performance test, and the six-edged steel (straight carbon steel) of cutting Φ 32mm, after cutting ten cuttves, its revolving strength (break line speed) is 73.97m/s, and after cutting, emery wheel residual diameter is 381mm, and cutting efficiency (average cut time) is 8.1s.
Embodiment 1
100g alkali lignin (Shandong Quan Lin Chemical Co., Ltd.) is put in the NaOH solution that 500g mass concentration is 1%, stirs to being completely dissolved and obtain alkali lignin solution, then will add 10g formaldehyde to above-mentioned alkali lignin solution, obtain reaction solution.Above-mentioned reaction solution is heated to 95 DEG C, after reacting 4 hours, reaction solution has a large amount of blocks of solid precipitate out, obtain reactant mixture, now stopped reaction.Above-mentioned reactant mixture being cooled to 20 DEG C, after centrifugation, then is dried in an oven by the solid being centrifugally separating to obtain, baking temperature is 45 DEG C, and drying time is 6 hours, obtains the 74.5g hydroxylated lignin dried.Finally more above-mentioned dry hydroxylated lignin pulverizer is crushed to 200 orders, obtains the hydroxylated lignin A, i.e. coagent A of powdery.
By the 36# Brown Alundum of 1000g, 120g emery wheel wetting agent (Shandong Shengquan Chemical Industry Co., Ltd., PF-2550), 240g phenol-formaldehyde resin powder, 24g activity emery wheel auxiliary agent A, 220g iron sulfide and 60g cryolite through batch mixing compressing, obtain resin wheel blank (Φ=400mm)；Resin wheel blank is hardened according to cure profile, prepares resin wheel 1#.
Above-mentioned emery wheel 1# carries out grinding performance test, and the six-edged steel (straight carbon steel) of cutting Φ 32mm, after cutting ten cuttves, its revolving strength (break line speed) is 76.89m/s, and after cutting, emery wheel residual diameter is 393mm, and cutting efficiency (average cut time) is 6.6s.
Embodiment 2
50g alkali lignin (Shandong Quan Lin Chemical Co., Ltd.) is put in the NaOH solution that 500g mass concentration is 2%, stirs to being completely dissolved and obtain alkali lignin solution, then will add 7.5g furfural to above-mentioned alkali lignin solution, obtain reaction solution.Above-mentioned reaction solution is heated to 85 DEG C, after reacting 4 hours, reaction solution has a large amount of blocks of solid precipitate out, obtain reactant mixture, now stopped reaction.Above-mentioned reactant mixture being cooled to 25 DEG C, after centrifugation, then is dried in an oven by the solid being centrifugally separating to obtain, baking temperature is 30 DEG C, and drying time is 10 hours, obtains the 39.0g hydroxylated lignin dried.Finally more above-mentioned dry hydroxylated lignin pulverizer is crushed to 150 orders, obtains the hydroxylated lignin B, i.e. coagent B of powdery.
By the 36# Brown Alundum of 720g, 100g emery wheel wetting agent (Shandong Shengquan Chemical Industry Co., Ltd., PF-2550), 240g phenol-formaldehyde resin powder, 12g activity emery wheel auxiliary agent B, 200g iron sulfide and 40g cryolite through batch mixing compressing, obtain resin wheel blank (Φ=400mm)；Resin wheel blank is hardened according to cure profile, prepares resin wheel 2#.
Above-mentioned emery wheel 2# carries out grinding performance test, and the six-edged steel (straight carbon steel) of cutting Φ 32mm, after cutting ten cuttves, its revolving strength (break line speed) is 74.70m/s, and after cutting, emery wheel residual diameter is 391mm, and cutting efficiency (average cut time) is 6.9s.
Embodiment 3
150g calcium lignosulfonate (the polynary lignin company limited in Gaotang, Shandong) is put in the NaOH solution that 500g mass concentration is 2%, stir to being completely dissolved and obtain calcium lignosulfonate solution, then will add 5g metaformaldehyde to above-mentioned calcium lignosulfonate solution, obtain reaction solution.Above-mentioned reaction solution is heated to 95 DEG C, after reacting 4 hours, reaction solution has a large amount of blocks of solid precipitate out, obtain reactant mixture, now stopped reaction.Above-mentioned reactant mixture being cooled to 30 DEG C, after centrifugation, then is dried in an oven by the solid being centrifugally separating to obtain, baking temperature is 60 DEG C, and drying time is 7 hours, obtains the 108.4g hydroxylated lignin dried.Finally more above-mentioned dry hydroxylated lignin pulverizer is crushed to 250 orders, obtains the hydroxylated lignin C, i.e. coagent C of powdery.
By the 36# Brown Alundum of 1440g, 110g emery wheel wetting agent (Shandong Shengquan Chemical Industry Co., Ltd., PF-2550), 240g phenol-formaldehyde resin powder, 36g activity emery wheel auxiliary agent A, 260g iron sulfide and 80g cryolite through batch mixing compressing, obtain resin wheel blank (Φ=400mm)；Resin wheel blank is hardened according to cure profile, prepares resin wheel 3#.
Above-mentioned emery wheel 3# carries out grinding performance test, and the six-edged steel (straight carbon steel) of cutting Φ 32mm, after cutting ten cuttves, its revolving strength (break line speed) is 74.41m/s, and after cutting, emery wheel residual diameter is 384mm, and cutting efficiency (average cut time) is 6.9s.
Embodiment 4
100g alkali lignin (Shandong Quan Lin Chemical Co., Ltd.) is put in the NaOH solution that 500g mass concentration is 1%, stirs to being completely dissolved and obtain alkali lignin solution, then will add 10g formaldehyde to above-mentioned alkali lignin solution, obtain reaction solution.Above-mentioned reaction solution is heated to 95 DEG C, after reacting 4 hours, reaction solution has a large amount of blocks of solid precipitate out, obtain reactant mixture, now stopped reaction.Above-mentioned reactant mixture being cooled to 20 DEG C, after centrifugation, then is dried in an oven by the solid being centrifugally separating to obtain, baking temperature is 45 DEG C, and drying time is 6 hours, obtains the 78.0g hydroxylated lignin dried.Finally more above-mentioned dry hydroxylated lignin pulverizer is crushed to 230 orders, obtains the hydroxylated lignin D, i.e. coagent D of powdery.
By the 36# carborundum of 1300g, 140g emery wheel wetting agent (Shandong Shengquan Chemical Industry Co., Ltd., PF-2550), 240g phenol-formaldehyde resin powder, 30g activity emery wheel auxiliary agent A, 250g iron sulfide and 70g cryolite through batch mixing compressing, obtain resin wheel blank (Φ=400mm)；Resin wheel blank is hardened according to cure profile, prepares resin wheel 4#.
Above-mentioned emery wheel 4# carries out grinding performance test, and the six-edged steel (straight carbon steel) of cutting Φ 32mm, after cutting ten cuttves, its revolving strength (break line speed) is 75.59m/s, and after cutting, emery wheel residual diameter is 394mm, and cutting efficiency (average cut time) is 6.8s.
Embodiment 5
150g alkali lignin (Shandong Quan Lin Chemical Co., Ltd.) is put in the NaOH solution that 500g mass concentration is 2%, stirs to being completely dissolved and obtain alkali lignin solution, then will add 10g furfural to above-mentioned alkali lignin solution, obtain reaction solution.Above-mentioned reaction solution is heated to 95 DEG C, after reacting 4 hours, reaction solution has a large amount of blocks of solid precipitate out, obtain reactant mixture, now stopped reaction.Above-mentioned reactant mixture being cooled to 25 DEG C, after centrifugation, then is dried in an oven by the solid being centrifugally separating to obtain, baking temperature is 50 DEG C, and drying time is 10 hours, obtains the 104.5g hydroxylated lignin dried.Finally more above-mentioned dry hydroxylated lignin pulverizer is crushed to 180 orders, obtains the hydroxylated lignin E, i.e. coagent E of powdery.
By the 36# carborundum of 850g, 130g emery wheel wetting agent (Shandong Shengquan Chemical Industry Co., Ltd., PF-2550), 240g phenol-formaldehyde resin powder, 20g activity emery wheel auxiliary agent A, 240g iron sulfide and 50g cryolite through batch mixing compressing, obtain resin wheel blank (Φ=400mm)；Resin wheel blank is hardened according to cure profile, prepares resin wheel 5#.
Above-mentioned emery wheel 5# carries out grinding performance test, and the six-edged steel (straight carbon steel) of cutting Φ 32mm, after cutting ten cuttves, its revolving strength (break line speed) is 75.42m/s, and after cutting, emery wheel residual diameter is 393mm, and cutting efficiency (average cut time) is 7.0s.
Embodiment 6
100g calcium lignosulfonate (the polynary lignin company limited in Gaotang, Shandong) is put in the NaOH solution that 500g mass concentration is 1%, stir to being completely dissolved and obtain calcium lignosulfonate solution, then will add 5g formaldehyde to above-mentioned calcium lignosulfonate solution, obtain reaction solution.Above-mentioned reaction solution is heated to 90 DEG C, after reacting 4 hours, reaction solution has a large amount of blocks of solid precipitate out, obtain reactant mixture, now stopped reaction.Above-mentioned reactant mixture being cooled to 25 DEG C, after centrifugation, then is dried in an oven by the solid being centrifugally separating to obtain, baking temperature is 40 DEG C, and drying time is 9 hours, obtains the 70.3g hydroxylated lignin dried.Finally more above-mentioned dry hydroxylated lignin pulverizer is crushed to 200 orders, obtains the hydroxylated lignin F, i.e. coagent F of powdery.
By the 36# carborundum of 1300g, 120g emery wheel wetting agent (Shandong Shengquan Chemical Industry Co., Ltd., PF-2550), 240g phenol-formaldehyde resin powder, 24g activity emery wheel auxiliary agent A, 230g iron sulfide and 60g cryolite through batch mixing compressing, obtain resin wheel blank (Φ=400mm)；Resin wheel blank is hardened according to cure profile, prepares resin wheel 6#.
Above-mentioned emery wheel 6# carries out grinding performance test, and the six-edged steel (straight carbon steel) of cutting Φ 32mm, after cutting ten cuttves, its revolving strength (break line speed) is 77.61m/s, and after cutting, emery wheel residual diameter is 387mm, and cutting efficiency (average cut time) is 7.0s.
Embodiment 7
By reactive resin emery wheel auxiliary agent A and emery wheel phenol-formaldehyde resin powder (Shandong Shengquan Chemical Industry Co., Ltd., PF-2801A) according to after 10:100 ratio mix homogeneously, after solidifying at 150 DEG C, obtain phenolic resin curing thing A, above-mentioned phenolic resin curing thing A is observed, result is the cross sectional photograph of phenolic resin curing thing A in the embodiment of the present invention 7 referring to Fig. 1, Fig. 1.
By reactive resin emery wheel auxiliary agent B and emery wheel phenol-formaldehyde resin powder (Shandong Shengquan Chemical Industry Co., Ltd., PF-2801A) according to after 10:100 ratio mix homogeneously, after solidifying at 150 DEG C, obtain phenolic resin curing thing B, above-mentioned phenolic resin curing thing B is observed, result is the cross sectional photograph of phenolic resin curing thing B in the embodiment of the present invention 7 referring to Fig. 2, Fig. 2.
By reactive resin emery wheel auxiliary agent C and emery wheel phenol-formaldehyde resin powder (Shandong Shengquan Chemical Industry Co., Ltd., PF-2801A) according to after 10:100 ratio mix homogeneously, after solidifying at 150 DEG C, obtain phenolic resin curing thing C, above-mentioned phenolic resin curing thing C is observed, result is the cross sectional photograph of phenolic resin curing thing C in the embodiment of the present invention 7 referring to Fig. 3, Fig. 3.
By above-mentioned emery wheel phenol-formaldehyde resin powder (Shandong Shengquan Chemical Industry Co., Ltd., PF-2801A) after individually solidifying at 150 DEG C, obtain phenolic resin curing thing D, above-mentioned phenolic resin curing thing D is observed, result is the cross sectional photograph of phenolic resin curing thing D in the embodiment of the present invention 7 referring to Fig. 4, Fig. 4.
From the section of the phenolic resin curing thing of Fig. 1～4 it can clearly be seen that, compare the phenolic resin curing thing D not adding activity emery wheel auxiliary agent, the phenolic resin curing thing A, B and the C that add activity emery wheel auxiliary agent all have substantial amounts of foam cells to be formed, and are owned by higher pore ratio.
Embodiment 8
Emery wheel 1～2 obtained by comparative example 1～2 and the emery wheel 1# obtained by embodiment 1～6～6# cutting the six-edged steel (straight carbon steel) of Φ 32mm, cuts ten cuttves, cutting effect is as shown in table 1:
Performance data after table 1 emery wheel 1～2 and emery wheel 1#～6# cutting
As it can be seen from table 1 comparative example 1 and comparative example 2 are the Brown Alundum emery wheel and the silicon carbide grinding wheel that do not add active emery wheel auxiliary agent prepared by this patent respectively.From cutting effect, adding the emery wheel 1#～6# of activity emery wheel auxiliary agent, its revolving strength, Nai Qiedu and cutting efficiency have raising in various degree.
Above a kind of resin wheel provided by the present invention is described in detail.Principles of the invention and embodiment are set forth by individual example specifically used herein, and the explanation of above example is only intended to help to understand method and the core concept thereof of the present invention.It should be pointed out that, for those skilled in the art, under the premise without departing from the principles of the invention, it is also possible to the present invention carries out some improvement and modification, these improve and modify in the protection domain also falling into the claims in the present invention.
Claims (7)
1. a resin wheel, it is characterised in that be made up of abrasive material, phenolic resin, coagent, wetting agent and inorganic filler；
Described coagent is methylolated lignin；Described inorganic filler is iron sulfide and cryolite；
Described methylolated lignin is prepared by the following method:
A) lignin liquor is obtained with alkali liquor after being mixed by lignin；
B) in above-mentioned lignin liquor, add aldehyde compound, temperature reaction, precipitate out methylolated lignin in the basic conditions；
Described alkali liquor is sodium hydroxide solution, potassium hydroxide solution, rubidium hydroxide solution or cesium hydroxide solution；
The temperature of described intensification is 85～95 DEG C.
2. resin wheel according to claim 1, it is characterised in that described lignin is alkali lignin, calcium lignosulfonate or sodium lignin sulfonate.
3. resin wheel according to claim 1, it is characterised in that the mass ratio of described abrasive material, coagent, wetting agent and phenolic resin is (3～6): (0.05～0.15): (0.4～0.6): 1.
4. resin wheel according to claim 1, it is characterised in that the mass ratio of described iron sulfide, cryolite and phenolic resin is (0.8～1.1): (0.15～0.35): 1.
5. resin wheel according to claim 1, it is characterised in that the mass ratio of described lignin and alkali liquor is (0.1～0.3): 1.
6. resin wheel according to claim 1, it is characterised in that described aldehyde compound includes one or more in formaldehyde, acetaldehyde, furfural, paraformaldehyde and metaformaldehyde.
7. resin wheel according to claim 1, it is characterised in that the mass concentration of described alkali liquor is 1～2%.
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| CN103755974A (en) * | 2014-01-23 | 2014-04-30 | 单成敏 | Preparation method of lignin modified polyester polyol |
| CN104985537B (en) * | 2015-08-04 | 2017-06-16 | 蓬莱市超硬复合材料有限公司 | A kind of composition metal resin anchoring agent diamond grinding wheel |
| CN109159039A (en) * | 2018-09-06 | 2019-01-08 | 扬中市飞宇磨具有限公司 | A kind of blade tool processing grinding abrasive disk |
| CN109503860B (en) * | 2018-12-13 | 2022-04-01 | 湖南绿燊环保科技有限公司 | Modified lignin for intumescent flame retardant and preparation method thereof, intumescent flame retardant and preparation method thereof |
| CN110497327A (en) * | 2019-08-29 | 2019-11-26 | 深圳市二砂深联有限公司 | Big outer diameter resin wheel and preparation method thereof |
| CN115008353B (en) * | 2022-07-04 | 2024-01-23 | 临沂市大鹏五金磨具有限公司 | Resin grinding wheel and preparation method thereof |
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