A kind of PU wheels
the preparation method of a kind of rubbing down wheel and rubbing down wheel, a kind of polyurethane rubbing down wheel and its system are particularly related to Preparation Method.
The polishing grinding consumptive material of polyurethane preparation in recent years is both at home and abroad all using relatively more, the rubbing down production of polyurethane material production Product have malleable good, and stock-removing efficiency is ideal, compared to other epoxy resin, polyamide, polyester resin, phenolic resin production Rubbing down wheel product want durable.
Using polyurethane material production rubbing down wheel product, there are mainly two types of forms at present:
1, the foaming grinding and polishing wheel of foamed material production, is added solvent, abrasive material, catalyst, foaming agent, foam stabilizer, heat dissipation Agent etc., product have foaming micropore, and product malleable is good, and the finish of polishing is good
2, it is to use polyurethane elastomer material, solvent, abrasive material, filler, antioxidant etc. is added, is not knitted to impregnate nylon After measuring fiber, it is laminated fixed-type backlash pressing chemical conversion final products, such polishing wheel product has that elasticity is good, and when polishing is bonded The mirror effect of workpiece, rubbing down is good, and to metal, alloy, glass is ceramic, and timber etc. has preferable rubbing down effect.
The polishing wheel product made of polyurethane foam form, it is not easily-controllable due to foamed time and with the production operation time System, and the gel time that blisters has much difficulty in healing weighing apparatus leads to impregnate fiber reinforcement being difficult to realize, easy to be influenced by environment temperature and humidity, Production structure is uneven, keeps the product strength of production insufficient, is easy to produce explosion.And use the production of polyurethane elastomer form Polishing wheel product, though being added to nylon fiber is fixed enhancing product structure intensity, polyurethane resin sizing material lacks foaming Structure when the materials such as polishing wheel product sanding and polishing metal, is easy that product and rubbing down workpiece is made to generate heat, causes resin carbonation in work Part remained on surface, the effect for the workpiece that influences to use and polish.
In addition, simple polyurethane foam wheel easily causes structure inhomogenous without fiber reinforcement in production preparation, cause strong Degree is insufficient, and mold heat-pressure curing is needed to be formed, and the nonwoven full-disk buff production production cycle is long, and polyurethane foam glue is not It adapts to, it is difficult to make the product of multilayer number
the problems of the prior art, propose that product structure, but also energy not only can be enhanced in one kind Make product that there is foaming structure, to realize in product strength and all ideal rubbing down wheel of rubbing down effect.
In order to solve the above technical problems, the present invention is achieved by the following scheme:
A kind of polyurethane rubbing down wheel comprising several layers are coated with the nylon fiber nonwoven of wear-resisting slurry, and described is resistance to Defibrination material includes the component of following parts by weight:
It 100 parts of terminated polyurethane prepolymer, 10-40 parts of chain extender, 5-15 parts of solvent, 0.01-0.5 parts of foaming agent, urges 0.01-0.5 parts of agent, 0.1-0.8 parts of antioxidant, 100-500 parts of abrasive material, 2-20 parts of lubricant, 0.5-5 parts of toner.
Further, the terminated polyurethane prepolymer is polyether-type blocked polyurethane performed polymer, polyester-type sealing end One or both of base polyurethane prepolymer for use as.
The main material of synthesis of polyurethane performed polymer is two kinds: one is polymeric polyols alcohols, including polyether polyols are pure and mild Polyester polyol, polyether polyol may include many classes, such as polypropylene oxide ether dihydric alcohol, polytetrahydrofuran ether glycol again Deng；Polyester polyol has polycarbonate glycol, polycaprolactone diols etc. again.Another material is polyisocyanates, including Toluene di-isocyanate(TDI) TDI type, ditolyl methane diisocyanate MDI type, naphthalene diisocyanate NDI type, six methines two are different Cyanate HDI type, to phenyl diisocyanate PPDI type etc..
Further, the chain extender be selected from 1,4-butanediol, ethylene glycol, diglycol, 1,6- hexylene glycol, HQEE, glycerol, pentaerythrite, 3,3- bis- chloro- 4,41Diphenylmethanediamiand, 4,41Diaminodiphenyl-methane, toluene two Amine, 3,5- dimethythiotoluene diamine, 3,5- diethyl toluene diamine, triethanolamine, diethanol amine, triisopropanolamine, methyl One of diethanol amine, adipic acid, terephthalic acid (TPA), M-phthalic acid are a variety of.
Further, the solvent is selected from ethyl acetate, butyl acetate, acetone, methyl ethyl ketone, toluene, dimethylbenzene, diformazan One of base formamide, propylene glycol monomethyl ether acetate are a variety of.
Further, the foaming agent is selected from water, chloro fluoroethane, pentamethylene, pentane, pentafluoropropane, liquid dioxy Change one of carbon, methylene chloride, 1,1- Difluoroethane or a variety of.
Further, the catalyst is selected from triethylenediamine, dimethyl cyclohexyl amine, N- methyldicyclohexylamine, five Methyl diethylenetriamines, tetramethylethylenediamine, 4-methyl-diaminopropane, 4-methyl hexamethylene diamine, (the dimethylamino first of 2,4,6- tri- Base) phenol, dimethylethanolamine, trimethyl ethoxy-c diamines, trimethyl hydroxyethylammonium ethylenediamine, N-methylmorpholine, N- ethyl Morpholine, N- methylimidazole, DBU, triethylamine, dibutyl tin dilaurate, stannous octoate, isooctyl acid potassium, potassium acetate, potassium oleate, One of phenylmercuric acetate, butyl titanate, tetraisopropyl titanate are a variety of.
Further, the antioxidant is selected from antioxidant 245, antioxidant 264 (BHT), antioxidant 1010, antioxidant 1035, antioxidant 3114, triphenyl, the different monooctyl ester of phosphorous acid diphenyl, antioxidant B215, one in antioxidant B225 Kind is a variety of.
Further, it is rigid to be selected from black silicon carbide, green silicon carbide, white fused alumina, Brown Alundum, black corundum, monocrystalline for the abrasive material One of jade, fused alumina zirconia, diamond, boron nitride are a variety of, and abrasive grain range is not less than 60#。
Further, the lubricant is selected from talcum powder, kaolin, calcium carbonate, zinc stearate, barium stearate, tristearin One of sour calcium, lead stearate, lithium stearate, polyethylene wax powder, polytetrafluoroethylene (PTFE) wax powder, polyamide wax powder are a variety of, profit Lubrication prescription partial size is less than 10um.
Further, the toner is in iron oxide red, heatproof rouge and powder, carbon black, titanium dioxide, chrome green powder, orange powder It is one or more.
The preparation method of above-mentioned polyurethane rubbing down wheel, includes the following steps:
S1, required component and content are measured, according to solvent, terminated polyurethane prepolymer, antioxidant, catalyst, Charging is stirred at room temperature in the charging sequence of chain extender, foaming agent under the revolving speed of 1000-2000r/min, continues room after completing charging Temperature stirring 3-10min, then sequentially adds toner, lubricant, abrasive material, and be stirred at room temperature under 1500-3000r/min revolving speed 3-10min obtains wear-resisting slurry；
S2, the wear-resisting slurry being stirred is transported on two roller bearings of coating machine, with the revolving speed roll-in of 200-900r/min On nylon fiber nonwoven between two roller bearings, the non-woven fabrics with the sand of resistance to defibrination is cut into the shape of required product specification, The cloth with the different numbers of plies and thickness is laminated into, it is then with cloth locking typified form that cloth is fixed-type；
S3, it is demoulded after being overturn 1-8 hours with turning mechanical, obtains the cloth of semi-finished product, it is small that cloth is hung 3-12 Shi Houyong punching machine strikes out the rubbing down wheel semi-finished product of various specifications, the 60-180 degrees Celsius of baking in hot-blast baker of rubbing down wheel semi-finished product Roasting vulcanization 2-20 hours, comes out of the stove to obtain polyurethane rubbing down wheel finished product after Temperature fall to room temperature.
The present invention has the beneficial effect that compared with prior art
Polyurethane rubbing down wheel of the invention promotes 1 times of left side compared with the rubbing down wheel of market same type on robustness The right side, surface roughness value are reduced by about 50%.
The present invention modulates the adhesive of malleable, wearability according to the proportion formula of polyurethane stock material, passes through foaming The principle of agent makes adhesive generate uniform foaming mechanisms, is conducive to that abrasive dust is absorbed and excluded when workpiece rubbing down, is conducive to radiate, The lubricant of addition is also that heat spreading function when playing rubbing down avoids work piece production high temperature from burning, and nylon fiber is primarily served to production The effect of the enhancing of product structure.Basic principle is exactly malleable, wearability and the stickiness to workpiece according to polyurethane material, The new product that production product reaches client's rubbing down requirement is carried out by the principles such as foaming, heat dissipation, fiber reinforcement and technique.
Specific embodiment
The information about to allow those skilled in the art to be more clear, the present invention will be made below further Explanation.
Embodiment 1
A kind of polyurethane rubbing down wheel is coated with the nylon fiber nonwoven of wear-resisting slurry including several layers, and described is wear-resisting Slurry includes the component of following parts by weight:
100 parts of terminated polyurethane prepolymer, 10 parts of chain extender, 5 parts of solvent, 0.5 part of foaming agent, 0.5 part of catalyst, resist 0.1 part of oxidant, 100 parts of abrasive material, 2 parts of lubricant, 0.5 part of toner.
Embodiment 2
A kind of polyurethane rubbing down wheel is coated with the nylon fiber nonwoven of wear-resisting slurry including several layers, and described is wear-resisting Slurry includes the component of following parts by weight:
100 parts of terminated polyurethane prepolymer, 20 parts of chain extender, 10 parts of solvent, 0.25 part of foaming agent, catalyst 0.25 Part, 0.5 part of antioxidant, 300 parts of abrasive material, 10 parts of lubricant, 2.5 parts of toner.
Embodiment 3
A kind of polyurethane rubbing down wheel is coated with the nylon fiber nonwoven of wear-resisting slurry including several layers, and described is wear-resisting Slurry includes the component of following parts by weight:
100 parts of terminated polyurethane prepolymer, 40 parts of chain extender, 15 parts of solvent, 0.01 part of foaming agent, catalyst 0.01 Part, 0.8 part of antioxidant, 500 parts of abrasive material, 20 parts of lubricant, 5 parts of toner.
In embodiment 1-3, the terminated polyurethane prepolymer is polyether-type blocked polyurethane performed polymer, polyester-type envelope Hold one or both of base polyurethane prepolymer for use as.The main material of synthesis of polyurethane performed polymer is two kinds: one is polymeric polyols Alcohols, including the pure and mild polyester polyol of polyether polyols, polyether polyol may include many classes, such as polypropylene oxide ether two again First alcohol, polytetrahydrofuran ether glycol etc.；Polyester polyol has polycarbonate glycol, polycaprolactone diols etc. again.It is another Material is polyisocyanates, including toluene di-isocyanate(TDI) TDI type, ditolyl methane diisocyanate MDI type, naphthalene diisocyanate Ester NDI type, hexamethylene-diisocyanate HDI type, to phenyl diisocyanate PPDI type etc..