CN1169661C

CN1169661C - Process for directly producing active rubber powder with waste rubber

Info

Publication number: CN1169661C
Application number: CNB011136928A
Authority: CN
Inventors: 刘扬生
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-06-14
Filing date: 2001-06-14
Publication date: 2004-10-06
Anticipated expiration: 2021-06-14
Also published as: CN1392037A

Abstract

The present invention relates to a method for directly preparing active rubber powders by waste rubber. After being primarily dried, sheared coarse waste rubber particles with the grain diameter of 1 to 2mm are directly added with surface treating agents and homogeneously mixed. Subsequently, after the mixture is pulverized, refined and secondarily dried, finished product active rubber powders can be obtained by selection, classification and discharge. The present invention activates powder particles by heat generated in the processes of pulverization and refinement of the rubber particles, and the powder particles react with the surface treating agents. The present invention has the advantages of one-step completion of the processes of the pulverization and the refinement of the rubber particles and the process of surface modification treatment of the rubber powders, simple technology and equipment and low energy consumption. The present invention can effectively solve the problem of powder particle agglomeration. The obtained rubber powder product has the advantages of high activity and good compatibility and stability, and thus, the mixed dosage of the rubber powders is obviously increased.

Description

The method of directly producing active rubber powder with waste rubber

The present invention relates to a kind of method of directly producing active rubber powder with waste rubber, belong to rubber recycling technology.

Along with the raising of industrialized level, both at home and abroad the output of rubber, particularly rubber tyre increases progressively rapidly, and the harm that thereupon brings is a large amount of to scrap tire and Rubber waste causes great pollution to environment.For protecting environment and saving resource; people more and more pay attention to the comprehensive utilization to scrap rubber; scrap rubber is made rubber powder, rubber powder is blended in to produce new rubber in the new sizing material or be blended in the methods such as performance that are used to improve the nonrubber product in other raw material (as pitch, plastics or waterproof material) be the main path that present scrap rubber is recycled.Generally speaking, the particle diameter of rubber powder is more little, and specific area is big more, and interface compatibility is good more, and easier and new sizing material or other material combine, and the product properties after it is mixed is also good more.Yet, produce meticulous rubber powder cost is increased substantially, in addition, because rubber powder granule only contains shielding molecular link not crosslinked when originally vulcanizing on a small quantity, surface-active is little, so the doping level of rubber powder generally is limited in about 10%, otherwise rerum natura is descended significantly.The method that adopts modification to handle, on the surface of rubber powder chemisorbed or chemical reaction take place by modifier, make vulcanized rubber powder form active membrane, active colloidal powder after this modification, can increase the surface tackiness of rubber powder particulate, reduce the required energy of surface engagement, improve dispersed homogeneous degree, thereby can or improve under the prerequisite of some performance of goods in basic assurance goods physical property, reach the purpose that strengthens the rubber powder doping level.Present this modification treatment process all is located at after rubber powder makes, promptly be that the finished product rubber powder that reaches the certain fineness requirement that has made is carried out surface modification treatment, this system active colloidal powder method need be put special equipment in addition and heating energy source is provided, complex technical process, operation is discontinuous, inefficiency, power consumption is big, and easily be agglomerated into false bulky grain between powder because of thin rubber powder, and cause the rubber powder activation uniformity poor, influence the modified effect of rubber powder.

The method that the purpose of this invention is to provide a kind of directly producing active rubber powder with waste rubber, it can carry out the surface active modification of rubber powder simultaneously and handle in the process of glue powder, to simplify technology, save energy consumption and equipment investment, and overcome the problem of the activation lack of homogeneity that causes because of the rubber powder reunion in the activation modification process.

The nonrubber class foreign material that the method for directly producing active rubber powder with waste rubber of the present invention comprises the steps: to carry secretly in the scrap rubber are (as the wire in the tire, filament etc.) after the removing, mechanical processing method with routine cuts into the thick micelle that particle diameter is 1-2mm, after the one-level drier is suitably dry, add surface conditioning agent, after in blender, evenly mixing, send into further dispersion and fining in the special-purpose pulverizer, the heat that utilizes micelle to produce in the dispersion and fining process activates powder and reacts with surface conditioning agent, the dispersion and fining of micelle and the surface modification treatment process of rubber powder are once finished, rubber powder is gone into suitably drying of secondary drying device after the pulverizer discharging, get the active colloidal powder finished product of modification behind the classified device sieving and grading; Said surface conditioning agent comprises activating agent, compatilizer and grinding aid among the present invention; Wherein, activating agent is at least a compound in metal oxide, amine, unsaturated organic acid and the derivative thereof, and its consumption is the 0.1-5% of thick micelle weight; Compatilizer is at least a compound in organosilicon, the polyolefin oligomer, and its consumption is the 0.1-5% of thick micelle weight; Grinding aid is at least a compound in phthalic acid ester, the aromatic mercaptans derivative, and its consumption is 0.1～3% of a scrap rubber coarse grain weight.

Among the present invention, the selection of surface treatment immunomodulator compounds is decided according to the different purposes of mixing of active colloidal powder, for example for mixing in the active colloidal powder of rubber and plastic products, its activating agent is selected from least a compound in zinc oxide, calcium oxide, magnesia, zinc stearate, calcium stearate, dolomol, oleic acid, the linoleic acid; Compatilizer is selected from least a compound in silane, random polypropylene, the Tissuemat E; Grinding aid is selected from least a compound in trichlorothiophenol, the repefral.

For mixing in the active colloidal powder of road shop material and waterproof material, its activating agent is selected from least a compound in monoethanolamine, acrylic acid, the methacrylic acid; Compatilizer is selected from silane, random polypropylene, at least a compound in Tissuemat E, the phthalic anhydride; Grinding aid is selected from least a compound of pentachlorothiophenol, repefral.

Thick micelle is undertaken in the process by above each step, and material is carried continuously by auger conveyor or drag conveyer between each equipment, the fine powder that meets granularity requirements after the classification pan tank of making a gift to someone, and coarse fodder can return blender reprocessing.Some does not have the occasion (as mixing in road shop material) of strict demand to the fineness of rubber powder, then can not need the classification operation, and pan tank can be directly all sent in the discharging of second level drier.

From such scheme as can be known, the present invention makes in the method for active colloidal powder, surface conditioning agent just added in the thick micelle before pulverising step and mixes, size reduction machinery is being executed micelle when being active forces such as shearing, grinding, impact, micelle is by dispersion and fining, part mechanical energy is converted into heat energy simultaneously, powder is heated and is activated, the cohesive energy and the surface-active of powder are changed, very easily react, thereby once finish in the dispersion and fining process of micelle and the surface treatment process of rubber powder with the surface conditioning agent that adds.Compare with existing vulcanized rubber powder activation modification method, the present invention need not to establish in addition special equipment and external energy, make the production process serialization of active colloidal powder, simplified technology greatly, equipment investment and energy consumption have been saved, and under the effect of pulverizer machinery power, promote and strengthened the reaction of surface conditioning agent, can overcome the problem that powder is reunited effectively, make surface conditioning agent more even, react more abundant with combining of powder, thereby the micelle product of gained is active high, stability and compatibility are good, and quality is better, thereby the doping level of rubber powder is obviously improved.

Accompanying drawing is represented the process flow diagram of scrap rubber system active colloidal powder of the present invention.

As shown in drawings, particle diameter is that the scrap rubber coarse grain of 1-2mm is sent into 1 heating of one-level drier Send into blender 2 after the drying, in blender 2, drop into surface conditioning agent, the two mixing simultaneously After send into pulverizer 3, be ground into rubber powder at this micelle, be reacted into surface conditioning agent simultaneously Active colloidal powder continues to be conveyed into secondary drying device 4, suitably sends into clasfficiator 5 bases after the drying The rubber powder particle diameter carries out sizing screening, and wherein the satisfactory thin rubber powder of particle diameter is sent into pan tank 6, Undesirable thick rubber powder is sent back in the blender 2 and is processed. Material is at each equipment in this flow process Between operation all carry by auger conveyor.

Provide embodiments of the invention below, and flow process is illustrated in conjunction with the accompanying drawings.

Embodiment one mixes in rubber and predicts the preparation of the active colloidal powder of goods

To contain natural rubber 70% (weight); The waste rubber tire of butadiene-styrene rubber 30% (weight) cuts into the micelle that particle diameter is 1-2mm after removing impurity; Send into one-level drier 1; Under 90 ℃, carried out drying 10 minutes; Blender 2 is sent in discharging; In blender, drop into surface conditioning agent (following each compound percentage represents respectively the weight ratio with micelle) by following proportioning simultaneously: activating agent monoethanolamine 1%; Compatilizer silane 3%; Grinding aid trichlorothiophenol 1.5%; Discharging enters pulverizer 3 behind the uniform stirring; Be ground into the rubber powder of particle diameter＜250 micron; Enter secondary drying device 4 after the discharging; Carried out drying under 90 ℃ 10 minutes; Clasfficiator 5 is sent in discharging; Classified screening, wherein 80% powder is sent into pan tank 6 by 180 tm screen mesh as the thin glue fines of 80 order finished products, and all the other coarse fodders of 20% (60-80 order) are back to blender 2 reprocessing.

Embodiment two mixes in the preparation of the active colloidal powder of road shop material and waterproof material

To contain natural rubber 30%; butadiene-styrene rubber 20%; waste rubber tire of butadiene rubber 50% is a raw material; the operating procedure of preparation active colloidal powder is identical with embodiment one; different is surface conditioning agent is by following proportioning input (compound percentage is represented the weight ratio with micelle respectively): activating agent methacrylic acid 1%; compatilizer random polypropylene 3%, grinding aid repefral 1%.After 5 screenings of rubber powder clasfficiator, 85% powder can become 80 order finished product fineves by 250 microns sieve screen apertures, and all the other 15% coarse fodders (60-80 order) return reprocessing.

Claims

The method of directly producing active rubber powder with waste rubber, comprise the steps: rubber is sheared the thick micelle that becomes 1-2mm, sieving and grading discharging behind one-level drying, dispersion and fining, secondary drying, it is characterized in that before dispersion and fining, adding surface conditioning agent through the dried thick micelle material of one-level, evenly mix, the heat that utilizes micelle to produce in the dispersion and fining process activates powder and reacts with surface conditioning agent, the surface modification treatment process of the dispersion and fining of micelle and rubber powder is once finished, and said surface conditioning agent comprises activating agent, compatilizer and disintegrator auxiliary agent; Wherein activating agent is selected from least a compound in zinc oxide, calcium oxide, magnesia, zinc stearate, calcium stearate, dolomol, oleic acid, linoleic acid, monoethanolamine, acrylic acid, the methacrylic acid; Its consumption is the 0.1-5% of thick micelle weight; Compatilizer is selected from least a compound in silane, random polypropylene, Tissuemat E, the phthalic anhydride, and its consumption is the 0.1-5% of thick micelle weight; Grinding aid is selected from least a in trichlorothiophenol, the repefral, and its consumption is the 0.1-3% of thick micelle weight.