CN105290981A - Silver modified diamond abrasive grinding wheel and preparation method thereof - Google Patents

Abstract

The invention discloses a silver modified diamond abrasive grinding wheel. The silver modified diamond abrasive grinding wheel comprises the following raw materials in parts by weight: 42-50 parts of forsterite, 3-4 parts of silver nitrate, 100-120 parts of diamond abrasive, 440-500 parts of CBN abrasive, 90-100 parts of phenol, 96-110 parts of 35-40% formaldehyde solution, 5-7 parts of boric acid, 2-6 parts of hexamethylene tetramine, 13-20 parts of aniline, 0.2-0.3 part of stannous octoate and 1-2 parts of sodium nitrite. The silver modified diamond abrasive grinding wheel has the beneficial effects that the silver modified abrasive is obtained by using silver nitrate as a precursor, therefore, the grinding efficiency of the grinding wheel can be obviously improved, and the strength of the grinding wheel is improved.

Description

A kind of modified by silver diamond abrasive emery wheel and preparation method thereof

Technical field

The present invention relates to emery wheel technical field, particularly relate to a kind of modified by silver diamond abrasive emery wheel and preparation method thereof.

Background technology

Along with automobile, the improving constantly of aircraft uniform velocity, more strict to the requirement of the friction material such as transmission, braking, and matrix is exploitation and the emphasis of research as the important component part of friction material always.Phenolic resins, epoxy resin, butadiene-styrene rubber and polytetrafluoroethylene (PTFE) all can be used as the matrix of friction material, but epoxy resin, butadiene-styrene rubber and polytetrafluoroethylene (PTFE) limit its application in friction material due to poor anti-wear performance, heat resistance and bond performance.The advantage of phenolic resins in heat resistance, bond performance, mechanical property, moulding processability and cost etc., becomes the most frequently used adhesive matrix material of composite friction material.But the defects such as when pure phenolic resin exists that fragility is large, poor toughness, hardness are high, heat resistance is not enough, intensity is low and use noise is large, extreme influence Properties of Friction Materials, therefore, carrying out modification to phenolic resins is the effective ways improving its combination property.

Summary of the invention

The object of the invention is exactly the defect in order to make up prior art, provides a kind of modified by silver diamond abrasive emery wheel and preparation method thereof.

The present invention is achieved by the following technical solutions:

A kind of modified by silver diamond abrasive emery wheel, it is made up of the raw material of following weight parts:

Forsterite 42-50, silver nitrate 3-4, diamond abrasive 100-120, CBN abrasive material 440-500, phenol 90-100,35-40% formalin 96-110, boric acid 5-7, hexamethylenetetramine 2-6, aniline 13-20, stannous octoate 0.2-0.3, natrium nitrosum 1-2.

A preparation method for described modified by silver diamond abrasive emery wheel, comprises the following steps:

(1) forsterite is calcined 1-2 hour at 600-700 DEG C, cooling abrasive dust, mixes with natrium nitrosum, and add compound weight 2-3 deionized water doubly, soak 30-40 minute, dry, mix with stannous octoate, diamond abrasive, ball milling is even;

(2) above-mentioned silver nitrate is joined in 30-40 times of absolute ethyl alcohol, send into polytetrafluoroethylene (PTFE) autoclave, magnetic agitation 10-20 minute, add the compound abrasive of step (1), magnetic agitation 20-30 minute, discharging, centrifugation, by solid content freeze-day with constant temperature 16-20 hour at 160-200 DEG C, obtain modified by silver abrasive compound;

(3) 70-75% of 68-75%, 35-40% formalin weight of above-mentioned phenol weight is mixed, stir, add NaOH, adjustment PH is 8-9, and raised temperature is 70-75 DEG C, insulated and stirred 1.6-2 hour, add boric acid, raised temperature is 110-120 DEG C, decompression dehydration 50-60 minute, add the absolute ethyl alcohol of mixed system weight 2-3%, stir, first at 80-90 DEG C, heat 8-10 hour, then at 110-115 DEG C, heat 8-9 hour, cooling, obtains boric acid phenolic resins;

(4) by above-mentioned hexamethylenetetramine, the mixing of boric acid phenolic resins, wear into fine powder, cross 160-200 mesh sieve, obtain boric acid phenol-formaldehyde resin powder;

(5) by remaining phenol, the mixing of 35-40% formalin, add mixed liquor weight 1-1.5 butanone doubly, stir, be heated to 80-85 DEG C, drip aniline, insulation reaction 4-6 hour at the temperature disclosed above after dropwising, heating decompression distillation to system temperature is 100-105 DEG C, cooling, obtains benzoxazine monomer;

(6) by above-mentioned boric acid phenol-formaldehyde resin powder, the mixing of benzoxazine monomer, join in compound weight 2-3 butanone doubly, stirring and dissolving, vacuum drying 2.6-3 hour at 76-80 DEG C, concentrated, be cured under following intensification system, described intensification system is: 80-90 DEG C, 50-60 minute; 100-110 DEG C, 100-120 minute; 130-140 DEG C, 40-50 minute are benzoxazine phenol-formaldehyde resin modified;

(7) above-mentioned benzoxazine phenol-formaldehyde resin modified is mixed with modified by silver abrasive compound, stir, add each raw material of residue, hot-forming, described hot pressing temperature is 160-170 DEG C, pressure 39O-410T, hot pressing time are 30-32 minute, and in hot pressing, every 4-5 minute steam bleeding once;

(8) by above-mentioned hot-forming after resin grinding wheels thickness closed assembly according to demand get up, separate with sheet iron plate, put into the hardening furnace preset and harden, the intensification system of sclerosis is: 100-120 DEG C, 4-5 hour; 125-140 DEG C, 7-8 hour; 150-170 DEG C, 1-2 hour; 180-185 DEG C, 8-9 hour; Naturally cool after stopping heating, obtain described resin wheel.

Advantage of the present invention is:

Emery wheel of the present invention has good heat endurance, and this is owing to introducing benzoxazine resin in phenolic cure structure, and it is a kind of containing phenyl ring and the heteroatomic dicyclic compound of N, O, so heat endurance is strong;

Wheel hardness of the present invention is high, and this is owing to adding benzoxazine monomer, and in its hot pressing at emery wheel and hardening process, volatile substances is few, reduces the porosity of emery wheel, improves compactness and hardness;

Emery wheel revolving strength of the present invention is high, and this is that emery wheel after hardening volume contraction is little owing to adding benzoxazine monomer, decreases internal stress and micro-crack;

The present invention introduces boron at emery wheel in phenolic resins, improve the combination property of finished product, this is because phenolic resins is to connect phenyl ring by C-C key, and boron bakelite resin is by B-" key connects phenyl ring; wherein the bond energy of C-C is the bond energy of 347KJ/mol, B-O is 523KJ/mol, far above the bond energy of C-C; define the three-dimensional cross-linked structure of boracic, can significantly improve the heat resistance of emery wheel, instantaneous heat-resisting quantity, ablation resistance;

The present invention adopts silver nitrate to be presoma, obtains the abrasive material of modified by silver, can significantly improve the grinding efficiency of emery wheel, improves intensity.

Detailed description of the invention

A kind of modified by silver diamond abrasive emery wheel, it is made up of the raw material of following weight parts:

Forsterite 42, silver nitrate 3, diamond abrasive 100, CBN abrasive material 440, phenol 90,35% formalin 96, boric acid 5, hexamethylenetetramine 2, aniline 13, stannous octoate 0.2, natrium nitrosum 1.

A preparation method for described modified by silver diamond abrasive emery wheel, comprises the following steps:

(1) calcined 1 hour at 600 DEG C by forsterite, cooling abrasive dust, mixes with natrium nitrosum, adds the deionized water of compound weight 2 times, soak 30 minutes, and dry, mix with stannous octoate, diamond abrasive, ball milling is even;

(2) above-mentioned silver nitrate is joined in 30 times of absolute ethyl alcohols, send into polytetrafluoroethylene (PTFE) autoclave, magnetic agitation 10 minutes, add the compound abrasive of step (1), magnetic agitation 20 minutes, discharging, centrifugation, by solid content freeze-day with constant temperature 16 hours at 160 DEG C, obtain modified by silver abrasive compound;

(3) mix 70% of 68%, 35% formalin weight of above-mentioned phenol weight, stir, add NaOH, regulate PH to be 8, raised temperature is 70 DEG C, insulated and stirred 1.6 hours, add boric acid, raised temperature is 110 DEG C, decompression dehydration 50 minutes, add the absolute ethyl alcohol of mixed system weight 2%, stir, first heat 8 hours at 80 DEG C, then heat 8 hours at 110 DEG C, cooling, obtains boric acid phenolic resins;

(4) by above-mentioned hexamethylenetetramine, the mixing of boric acid phenolic resins, wear into fine powder, cross 160 mesh sieves, obtain boric acid phenol-formaldehyde resin powder;

(5) by remaining phenol, 35% formalin mixing, add the butanone of mixed liquor weight 1 times, stir, be heated to 80 DEG C, drip aniline, insulation reaction 4 hours at the temperature disclosed above after dropwising, heating decompression distillation to system temperature is 100 DEG C, and cooling, obtains benzoxazine monomer;

(6) by above-mentioned boric acid phenol-formaldehyde resin powder, the mixing of benzoxazine monomer, join in the butanone of compound weight 2 times, stirring and dissolving, vacuum drying 2.6 hours at 76 DEG C, concentrated, be cured under following intensification system, described intensification system is: 80 DEG C, 50 minutes; 100 DEG C, 100 minutes; 130 DEG C, 40 minutes is benzoxazine phenol-formaldehyde resin modified;

(7) above-mentioned benzoxazine phenol-formaldehyde resin modified is mixed with modified by silver abrasive compound, stir, add each raw material of residue, hot-forming, described hot pressing temperature is 160 DEG C, pressure 39OT, hot pressing time are 30 minutes, and in hot pressing, every 4 minutes steam bleedings once;

(8) by above-mentioned hot-forming after resin grinding wheels thickness closed assembly according to demand get up, separate with sheet iron plate, put into the hardening furnace preset and harden, the intensification system of sclerosis is: 100 DEG C, 4 hours; 125 DEG C, 7 hours; 150 DEG C, 1 hour; 180 DEG C, 8 hours; Naturally cool after stopping heating, obtain described resin wheel.

Performance test:

Heat decomposition temperature: >=420 DEG C;

Revolving strength 139m/s;

Abrasion test: with commercially available phenolic resins emery wheel and the emery wheel of the present invention of identical weight, same size, weight is 1kg, cut channel-section steel continuously in the same way respectively, emery wheel weight after commercially available phenol resin sand wheel cutting is 973g, weight after emery wheel cutting of the present invention is 981g, wear away little, durability is high.

Claims (2)

1. a modified by silver diamond abrasive emery wheel, is characterized in that what it was made up of the raw material of following weight parts:

Forsterite 42-50, silver nitrate 3-4, diamond abrasive 100-120, CBN abrasive material 440-500, phenol 90-100,35-40% formalin 96-110, boric acid 5-7, hexamethylenetetramine 2-6, aniline 13-20, stannous octoate 0.2-0.3, natrium nitrosum 1-2.

2. a preparation method for modified by silver diamond abrasive emery wheel as claimed in claim 1, is characterized in that comprising the following steps:

(1) forsterite is calcined 1-2 hour at 600-700 DEG C, cooling abrasive dust, mixes with natrium nitrosum, and add compound weight 2-3 deionized water doubly, soak 30-40 minute, dry, mix with stannous octoate, diamond abrasive, ball milling is even;

(2) above-mentioned silver nitrate is joined in 30-40 times of absolute ethyl alcohol, send into polytetrafluoroethylene (PTFE) autoclave, magnetic agitation 10-20 minute, add the compound abrasive of step (1), magnetic agitation 20-30 minute, discharging, centrifugation, by solid content freeze-day with constant temperature 16-20 hour at 160-200 DEG C, obtain modified by silver abrasive compound;

(3) 70-75% of 68-75%, 35-40% formalin weight of above-mentioned phenol weight is mixed, stir, add NaOH, adjustment PH is 8-9, and raised temperature is 70-75 DEG C, insulated and stirred 1.6-2 hour, add boric acid, raised temperature is 110-120 DEG C, decompression dehydration 50-60 minute, add the absolute ethyl alcohol of mixed system weight 2-3%, stir, first at 80-90 DEG C, heat 8-10 hour, then at 110-115 DEG C, heat 8-9 hour, cooling, obtains boric acid phenolic resins;

(4) by above-mentioned hexamethylenetetramine, the mixing of boric acid phenolic resins, wear into fine powder, cross 160-200 mesh sieve, obtain boric acid phenol-formaldehyde resin powder;

(5) by remaining phenol, the mixing of 35-40% formalin, add mixed liquor weight 1-1.5 butanone doubly, stir, be heated to 80-85 DEG C, drip aniline, insulation reaction 4-6 hour at the temperature disclosed above after dropwising, heating decompression distillation to system temperature is 100-105 DEG C, cooling, obtains benzoxazine monomer;

(6) by above-mentioned boric acid phenol-formaldehyde resin powder, the mixing of benzoxazine monomer, join in compound weight 2-3 butanone doubly, stirring and dissolving, vacuum drying 2.6-3 hour at 76-80 DEG C, concentrated, be cured under following intensification system, described intensification system is: 80-90 DEG C, 50-60 minute; 100-110 DEG C, 100-120 minute; 130-140 DEG C, 40-50 minute are benzoxazine phenol-formaldehyde resin modified;

(7) above-mentioned benzoxazine phenol-formaldehyde resin modified is mixed with modified by silver abrasive compound, stir, add each raw material of residue, hot-forming, described hot pressing temperature is 160-170 DEG C, pressure 39O-410T, hot pressing time are 30-32 minute, and in hot pressing, every 4-5 minute steam bleeding once;

(8) by above-mentioned hot-forming after resin grinding wheels thickness closed assembly according to demand get up, separate with sheet iron plate, put into the hardening furnace preset and harden, the intensification system of sclerosis is: 100-120 DEG C, 4-5 hour; 125-140 DEG C, 7-8 hour; 150-170 DEG C, 1-2 hour; 180-185 DEG C, 8-9 hour; Naturally cool after stopping heating, obtain described resin wheel.