CN103045171B - Dust inhibitor of friction material and application method thereof - Google Patents

Abstract

The invention relates to a dust inhibitor of a friction material and an application method thereof. The dust inhibitor consists of 2-5wt% of organic peroxide and 92-98wt% of assistant crosslinker; the organic peroxide can be methyl ethyl ketone peroxide; and the assistant crosslinker can be trimethylolpropane trimethylacrylate. The application method is carried out through the following steps of: respectively weighing the organic peroxide and the assistant crosslinker in percentage by mass to prepare the dust inhibitor; and adding the prepared mixture raw materials into a mixer, then slowly dropping the prepared dust inhibitor into the mixer, and starting the mixer to mix the materials for 10 minutes. According to the invention, the environmental pollution caused by the dust which is generated in the production process can be effectively eliminated; the prepared mixture materials are even and the materials are easily fed in the process of pressing; and the dispersion of the materials in the material chamber is good.

Description

A kind of dust inhibitor of friction materials and using method thereof

Technical field

The present invention relates in a kind of suppression friction materials production process and produce dust, be specifically related to a kind of dust inhibitor and using method thereof of friction materials.

Background technology

Friction materials production technique is mainly divided into dry method and wet method two kinds.Dry method does not adopt a class technique of solvent to be referred to as, and wet method utilizes solvent to be referred to as a class technique of carrier.Current dry method is occupied an leading position, and wet method is only applied in specialty products production.

The feature of dry process is that technique is simple, formula adjustment convenient; Obtained mixture is uniform fiber meal; Compression moulding easily feeds intake, and the good uniformity fed intake; Material might as well in the dispersiveness in material chamber.Compared with wet processing, dry process makes the stretching of material increase, and the strength property of goods improves, and directly can add staple fibre and other pulverulent material, do not need solvent, operation is short, and production cost is low.

But the disadvantage of dry process is that pulverulent material produces dust in multiple operation, and production scene is seriously polluted.In order to solve dust pollution question, people have carried out many-sided exploration, wherein applying maximum is install closed system additional to carry out dust Control, as cyclonic separator, sack cleaner, wet dust collector, electric precipitator etc., but dust removing effects is unsatisfactory, still require to carry out suitable dust work protection to operator.In addition, also have and adopt Banbury mixer to carry out batch mixing, mainly suppress material dust at compounding process, substantially solve material dust problem at storage, transport and suppression process, the dust that grinding and drilling operating produce also can reduce.This mixing procedure mainly make use of the kneading of Banbury mixer, stirring and Strong shear characteristic, make rubber pulverizing, degraded and can with powdered resin and filler blended, thus process even, loose Down Fiber shape material.But this technique also has limitation, mainly comparatively large to the destruction of fiber, its material needs to add more rubber, and product is difficult to adapt to bogie and uses.Therefore, the shortcoming existed in prior art, is necessary to make improvements prior art.

Summary of the invention

The object of the invention is to overcome shortcoming of the prior art with not enough, a kind of dust inhibitor that effectively can suppress the friction materials producing dust pollution in production process is provided.

Another object of the present invention is the using method of the dust inhibitor providing above-mentioned friction materials.

The present invention is realized by following technical scheme: a kind of dust inhibitor of friction materials, hundred parts of ratios are made up of the organo-peroxide of 2%-5% and the additional crosslinker of 92%-98% by weight, described organo-peroxide is selected from methylethyl ketone peroxide, dicumyl peroxide, benzoyl peroxide, ditertiary butyl peroxide, benzoyl peroxide, three peroxidation tri acetylacetonates, any one in Peroxyacetyl nitrate or Cumene Hydroperoxide 80, described additional crosslinker is selected from trimethylolpropane trimethacrylate, methacrylate, N, a N '-phenyl-bismaleimide, triallyl isocyanurate, Viscoat 295, any one in hydroxyethyl methylacrylate or dibutyl phthalate.

A using method for the dust inhibitor of friction materials, comprises the following steps:

(1) mixed raw material is prepared: the mixed raw material of preparation friction materials;

(2) dust inhibitor is prepared: take organo-peroxide and additional crosslinker respectively by mass percentage, slowly added in additional crosslinker by organo-peroxide, stir;

(3) mixed raw material that step (1) prepares is added mixer, then slowly drip the dust inhibitor prepared toward mixer, open mixer mixture 10 minutes.

Described dust inhibitor add-on is the 1%-5% of mixed raw material weight percent.

Principle of the present invention: the compounding process produced at friction materials, after in will fill a prescription, the starting material such as various powder, fiber drop into mixer, the friction materials dust inhibitor that sprinkling or dropping prepare.Start mixer mixture, due to weak viscosity and the water absorbability effect of additional crosslinker, make pulverulent material surface quick film-forming and Hardening, and organo-peroxide is under the effect of additional crosslinker, and produce certain chemical bond between resin linear molecule in material, free radical and the powder material effect of organo-peroxide generate complex compound, in the interactional process of this many character, parcel solidifies powder body material, improve material strength and make material Hardening, impelling material to be solidified as within 0.1-0.8 minute and be difficult to floating blocky-shaped particle.

Relative to prior art, the present invention can effectively reduce the dust produced in friction materials production process, reduce diffusibility and the range of scatter of dust, and the formula adjustment of the dust inhibitor of friction materials is convenient, obtained friction materials is even, pressing process easily feeds intake and the good uniformity fed intake, the friction materials good dispersity in material chamber, improve the shortcoming of the floating dust of dry process material, solve dust to the pollution problem of production environment.

Below in conjunction with embodiment, the present invention is further detailed explanation.

Embodiment

Embodiment 1:

(1) the mixed raw material 5000g of drum-type friction material is prepared: its composition and the mass percent accounting for mixed raw material are: Calcined polishing aluminum oxide 0.1-0.5%; Pure phenolic resin 7-11%; Nbr modified phenolic resins 5-10%; E-glass fibre 7-12%; Conjugated fibre 3-7%; Crystal fibre 6-12%; Manufacturability fiber 1-3%; Petroleum coke 8-12%; Black Cashew nut shell liquid friction powder 4-7%; Powdered nitrile rubber 1-4%; Ramentum graphite 8-13%; Iron black 2-6%; Ground barium sulfate 8-12%; Calcite 6-11%; Kaolin 6-9%.

(2) dust inhibitor 154.5g is prepared: with beaker precise trimethylolpropane trimethacrylate 150g, methylethyl ketone peroxide 4.5g, slowly added in trimethylolpropane trimethacrylate by methylethyl ketone peroxide, stirring with glass stick obtains dust inhibitor.

(3) mixed raw material prepared is added mixer, then the dust inhibitor prepared slowly is dripped toward mixer, open mixer mixture 10 minutes, along with adding and mixer mixture of dust inhibitor, can see that the floating dust that powder material produces progressively reduces from dog-house, until disappeared in 0.1-0.5 minute.The material completing mixing is observed, for the even little blocky-shaped particle that feel is harder, this material is placed in dust absorbing air passage mouth, opening suction fan makes wind speed reach 5m/s, material can not be sucked away, in weighing, the pressing process that feeds intake all do not produce floating dust, and the mobility etc. of the volatile content required pressing process, curing speed, material all has no significant effect.

Embodiment 2:

(1) the mixed raw material 5000g of disc-type friction material is prepared: its composition and the mass percent accounting for mixed raw material are: modified rubber resol 6-10%; Kevlar pulp 0.5-1.5%; Steel fiber 20-28%; Brass borings 5-8%; Synthetic graphite 5-9%; Cupric sulfide 5-8%; Antimony sulfide 4-7%; Process white 7-12%; Coke 5-8%; Calcined polishing aluminum oxide 0.5-1%; Expanded vermiculite 2-6%; Zircon 2-4%; Powdered nitrile rubber 2-5%.

(2) dust inhibitor 102.5g is prepared: with beaker precise trimethylolpropane trimethacrylate 100g, dicumyl peroxide 2.5g, slowly added in trimethylolpropane trimethacrylate by dicumyl peroxide, stirring with glass stick obtains dust inhibitor.

(3) kevlar pulp and synthetic graphite are added other mixed raw material in mixer Preblend after 12 minutes, then the dust inhibitor prepared slowly is dripped toward mixer, open mixer mixture 10 minutes, along with adding and mixer mixture of dust inhibitor, can see that the floating dust that powder material produces progressively reduces from dog-house, until disappeared in 0.1-0.3 minute.To the material observation completing mixing, feel is comparatively hard, uniform particles, and this material is placed in dust absorbing air passage mouth, opening suction fan makes wind speed reach 5m/s, material is not sucked away, and can not produce floating dust, have no significant effect pressing process in weighing, the pressing process that feeds intake.

Embodiment 3:

(1) the mixed raw material 400kg of drum-type friction material is prepared: its composition and the mass percent accounting for mixed raw material are: Calcined polishing aluminum oxide 0.1-0.5%; Pure phenolic resin 7-11%; Nbr modified phenolic resins 5-10%; E-glass fibre 7-12%; Conjugated fibre 3-7%; Crystal fibre 6-12%; Manufacturability fiber 13%; Petroleum coke 8-12%; Black Cashew nut shell liquid friction powder 4-7%; Powdered nitrile rubber 1-4%; Ramentum graphite 8-13%; Iron black 2-6%; Ground barium sulfate 8-12%; Calcite 6-11%; Kaolin 6-9%.

(2) dust inhibitor 10.3kg is prepared: with weight tank precise trimethylolpropane trimethacrylate 10kg, methylethyl ketone peroxide 0.3kg, methylethyl ketone peroxide is slowly added in trimethylolpropane trimethacrylate, stirs and obtain dust inhibitor.

(3) mixed raw material prepared is added mixer, then the dust inhibitor prepared slowly is dripped toward mixer, open mixer mixture 10 minutes, along with adding and mixer mixture of dust inhibitor, can see that the floating dust that powder material produces progressively reduces from dog-house, until disappeared in 0.3-0.8 minute.The material completing mixing is the harder even little blocky-shaped particle of feel, this material is placed in dust absorbing air passage mouth, opening suction fan makes wind speed reach 5m/s, material is not sucked away, material in weighing, the pressing process that feeds intake do not produce floating dust, the mobility etc. of the volatile content required pressing process, curing speed, material all has no significant effect.Product floating dust in sizing processes obviously reduces than the floating dust of the product not adding inhibitor.

Process obtained drum brake lining of city and the liner not adding dust inhibitor with formula by above-described embodiment 3, carry out performance comparison test according to state compulsory standard GB5763 – 2008, its test result is in table 1.

Table 1: add dust inhibitor and compare with the performance test results of the liner not adding dust inhibitor

Table 1

Test-results shows, add dust inhibitor and the same formula drum brake lining of city not adding dust inhibitor, its frictional behaviour trend is basically identical; Volume erosion rate and quality wear trend also basically identical, the wearing and tearing adding the liner of dust inhibitor slightly reduce; Add dust inhibitor basically identical with the same formula liner density not adding dust inhibitor to the Influence on test result of liner physicals, but shock strength, hardness slightly improve.

Certainly, the present invention also can be applicable to the dust suppression of the industries such as electric power, chemical industry, metallurgy, coal, machinery, light industry, wood working.

The present invention is not limited to above-mentioned embodiment, if do not depart from the spirit and scope of the present invention to various change of the present invention or distortion, if these are changed and distortion belongs within claim of the present invention and equivalent technologies scope, then the present invention is also intended to comprise these changes and distortion.

Claims (2)

1. the dust inhibitor of a friction materials, it is characterized in that: hundred parts of ratios are made up of the organo-peroxide of 2%-5% and the additional crosslinker of 92%-98% by weight, described organo-peroxide is selected from any one in methylethyl ketone peroxide, benzoyl peroxide, ditertiary butyl peroxide, three peroxidation tri acetylacetonates, Peroxyacetyl nitrate or Cumene Hydroperoxide 80, described additional crosslinker is selected from any one in methacrylic ester, N, N '-phenyl-bismaleimide, Viscoat 295 or dibutyl phthalate.

2. a using method for the dust inhibitor of friction materials, is characterized in that: comprise the following steps:

(1) mixed raw material is prepared: the mixed raw material of preparation friction materials;

(2) dust inhibitor is prepared: take the organo-peroxide of 2%-5% and the additional crosslinker of 92%-98% by mass percentage respectively, slowly added in additional crosslinker by organo-peroxide, stir; Described dust inhibitor add-on is the 1%-5% of mixed raw material weight percent;

(3) mixed raw material that step (1) prepares is added mixer, then slowly drip the dust inhibitor prepared toward mixer, open mixer mixture 10 minutes.