CN101554608B - Totally-closed sand grinding technology for coating production - Google Patents

Abstract

The invention discloses a totally-closed sand grinding technology for coating production, which comprises the steps: pigment paste which is primarily filtered by a totally-closed filter is conveyed toa horizontal sand grinding unit for sand grinding by the power provided by a pneumatic diaphragm pump on a sand grinding machine; after the fineness is detected by a fineness monitoring port to be qu alified, the pigment paste directly flows into a blending and packaging pot under the gravity action through a transporting pipe; the fineness monitoring port is provided with a waste gas collecting cover; the waste gas collecting cover is opened when the fineness monitoring port is opened; and the waste gas generated in the production process is all collected for centralized processing. The technology greatly improves the working atmosphere and the work intensity, and cancels the unsealed middle paint cylinder which is arranged between the horizontal sand grinding machine and the blending andpackaging pot and considered to be irreplaceable by the industry peer in the coating production; all the unsealed parts such as flow guiding and adding port of the centrifugal pump realize totally cl osing, thus solving the problem of inorganized emission of organic solvent from the root; and the clean power of the pneumatic diaphragm pump is adopted to play the roles of environmental protection and energy saving, therefore, the technology is a new production technology for the upgrading of the coating industry.

Description

The Totally-closed sand grinding technology of coating material production

Technical field

The present invention relates to a kind of production method of coating, particularly a kind of Totally-closed sand grinding technology that is used for making the important production link coating material production of solvent borne, water paint.

Background technology

In recent years; along with The development in society and economy; country also improves day by day to environmental protection requirement; on April 23rd, 2007; the national development and the reform committee have announced " the coating manufacturing industry cleaner production assessment indicator system (trying) " drafted by the cleaner Production in Chemical Industry center; this assessment indicator system has been stipulated the cleaning index of coating material production enterprise in more detail; and be two-stage according to overall merit gained score value with enterprise's cleaner production grade classification, promptly represent " the advanced enterprise of cleaner production " of advanced international level and represent domestic average " cleaner production enterprise ".

The production of coating comprises stirs material, grinding, blending, packing four procedures, the environmental issue that each operation all exists needs to administer, wherein VOC (annotate: VOC is the abbreviation of VOC) uncontrollable discharge then is the difficult point place that the coating material production environmental protection of enterprise is administered.In stirring material, blending, three operations of packing, VOC is easy to collect relatively; But grinding step is followed the circulation of material, and VOC (inorganization) discharging phenomenon is serious, is the key link that the coating material production enterprise pollution is administered.

The grinding of coating is according to the grinding machinery difference of using, divide ball-milling technology, roller grinding process, sand milling technology, wherein sand milling technology is widely adopted by coating material production enterprise because of simple to operate, sand milling efficient height, and it is discrete sand milling technology, horizontal sand milling technology and basket sand milling technology again.In the basket sand milling technology, horizontal layout equipment adopts the movable uncovered scuffing of cylinder bore of band end pulley, though can reach certain sealing (also being uncovered when basket sand milling at present) during sand milling, movable scuffing of cylinder bore is uncovered in the circulation process of mill base, this type of sand milling technology can't realize totally-enclosed; In the airtight vertical or horizontal sand milling technology, though realized real totally-enclosed of sand milling machinery self, but because do not solve control technology, must in the sand milling operation, insert at least one uncovered middle mill base cylinder, on the one hand when the multiple tracks sand milling as the buffer container of road, front and back sand milling, be used on the other hand controlling the mill base fineness, the mill base of guaranteeing to enter the paint operation meets the specification requirement of coating products, and this class technology is not accomplished totally-enclosed yet; In the open vertical sand milling technology, because of the opening of open vertical sand milling self, the VOC discharging is even more serious.

In sum, the current all kinds of sand milling technologies that extensively adopt, do not accomplish real totally-enclosed, the uncovered gathering hole of all kinds of forms that exist causes the VOC that sand milling operation place coating self contains to discharge in a large number, the heat that sand grinding process produces has then more quickened the mass rate of emission of VOC, the cleaning of uncovered position, colour changing operation are not only strengthened workman's workload, also had drawbacks such as waste raw material, raising production cost, increase waste disposal amount.Though the VOC of uncovered gathering hole can collect, collector because of the high ventilation of needs, but difficulty is big, cost is high, both wasted material, consumes energy again, coating material production enterprise is difficult to bear the collection control expense, the uncontrollable discharge ubiquity of VOC, cause sand milling place smell big, air quality is inferior, solvent based coating manufacturing enterprise is reduced essential safety especially, also do not met the requirement of coating manufacturing industry cleaner production assessment indicator system simultaneously, become the key factor of restriction coatings enterprises cleaner production.

Number of patent application 02137086.9 " method for producing coating " is though concentrate each production process, make the production overall process can be than carrying out automated production under the air-tight state, reduced labour intensity, but its production process is loaded down with trivial details, intermediate link such as various feed pot, equipment pump are many, the troublesome poeration cycle is long, because it also adopts traditional basket type sand mill to grind, therefore there is uncovered gathering hole, still have organic gas outwards to discharge and cause environmental pollution, operating environment is undesirable, does not reach the requirement of " the advanced enterprise of cleaner production " equally.

Summary of the invention

Technical problem to be solved by this invention is: the Totally-closed sand grinding technology that a kind of coating material production is provided, all uncovered gathering holes such as intermediate coat cylinder have been cancelled, realized the fully enclosed automatic operation completely of sand milling link, not only reduce the waste of raw material, the energy and to the pollution of environment, also boost productivity greatly, good product quality makes manufacturing enterprise can reach the requirement of " the advanced enterprise of cleaner production ".

The present invention addresses the above problem the technical scheme that is adopted: the production stage of the Totally-closed sand grinding technology of coating material production is:

1, utilize gravity to be used as power in pipeline is transported to totally-enclosed filter from the spice pot mill base after the premixed earlier, employing mesh size is 4～6 millimeters a mesh screen, after the preliminary filtration of totally-enclosed filter, according to the different fineness requirement, selection enters the horizontal sand mill group, fineness requirement only needs to insert a horizontal sand mill at 50～120 microns, and fineness requirement is needing two horizontal sand mill series connection to use below 50 microns;

2, the pneumatic diaphragm pump of mill base on horizontal sand mill after filtering provides power to be transported to the horizontal sand mill group to carry out sand milling, by the fineness monitoring mouthful detect fineness qualified after, under the gravity effect, directly enter blending packing pot by conveyance conduit again;

The step that detects fineness is: configure pneumatic diaphragm pump operating pressure setting value earlier, open pneumatic diaphragm pump preceding valve E, valve F simultaneously, start pneumatic diaphragm pump and horizontal sand mill group, open fineness monitoring mouth and corresponding gas sampling cover simultaneously, reach the regulation requirement until fineness to be measured, sand milling production is carried out automatically, the after this every valve that need open fineness monitoring mouth through 30～60 minutes, when opening fineness monitoring mouthful valve, also open the valve of gas sampling cover, carry out the one-time detection operation.

Compared with prior art, the invention has the advantages that:

1, the position of uncovered intermediate coat cylinder in the traditional coating production technology is made into the fineness monitoring mouth of batch operation, cancelled between horizontal sand mill and the blending packing pot and to have been thought all uncovered positions such as irreplaceable uncovered intermediate coat cylinder and centrifugal pump drainage charge door by the industry peer, really realized totally-enclosed completely, solved the problem that the organic solvent uncontrollable discharge produces from root, improved operating environment and played the environmental protection and energy saving effect again.

2, at a fineness monitoring mouthful place gas sampling cover is housed, has also opened the switch of gas sampling cover when opening sample valve, the switch of gas sampling cover has been closed in sampling again when finishing.So not only having exempted the intermediate coat cylinder wastes a large amount of solvents and the uncontrollable discharge of VOC because of cleaning, and the gas sampling cover is little, and ventilation is little, only just opens gas sampling cover switch when sampling and collects waste gas, and this operation at intermittence also helps the saving of the energy.

3, this production method is according to the fineness requirement of various types of coatings such as priming paint, intermediate coat, finish paint, the horizontal sand mill group sand milling that series connection is not counted on the same stage under the situation that does not have the intermediate coat cylinder, it is disposable qualified to make the coating fineness pass through horizontal sand mill, has increased substantially production capacity and production efficiency.

4, adopted the new equipment pneumatic diaphragm pump of making cleaning power with compressed air, the centrifugal pump that replaces traditional electricity consumption to be used as power, pneumatic diaphragm pump parts does not without spin have the axle envelope again, the medium pumped and the moving component of pump can be separated fully, make the medium of being carried can be to external leakage, do not produce pollutant and also can carry the medium of thickness, try hard to avoid without electrical actuation because of it in addition and exempted from hidden danger, can be inflammable, explosive environments is work down, for need not water and add the totally enclosed apparatus of lubricating oil, thoroughly having eradicated traditional handicraft uses centrifugal pump to need solubilizer, the drawback that adds the coating drainage, not only improved operating environment but also significantly reduce environmental pollution and reduce labour intensity, use the method manufacturing enterprise can reach the requirement of " the advanced enterprise of cleaner production " fully, and it is simple to operate, operation is few, and is with short production cycle, the production efficiency height.

Description of drawings

Fig. 1 is a process chart of the present invention.

1, pneumatic diaphragm pump, 2-1 and 2-2, horizontal sand mill group, 3, fineness monitoring mouthful, 4, the gas sampling cover.

The specific embodiment

Below in conjunction with accompanying drawing embodiments of the invention are further described.

Embodiment one, making solvent-borne type anti-corrosive primer

1, earlier the mill base after the premixed is used as power in pipeline is transported to totally-enclosed filter with gravity from the spice pot, in the mesh size is 4～6 millimeters mesh screen, after the preliminary filtration of totally-enclosed filter, select only to need to insert a horizontal sand mill according to fineness requirement;

2, the pneumatic diaphragm pump 1 of mill base after the filtration on horizontal sand mill 2-2 provides power to be transported to horizontal sand mill 2-2 to carry out sand milling, turn down the pressure set points (being set at 0.15Pa) that horizontal sand mill group 2-2 goes up pneumatic diaphragm pump 1, open valve E, valve F, start pneumatic diaphragm pump 1 and horizontal sand mill 2-2, open the valve J of fineness monitoring mouth 3 when opening gas sampling mouth 4 valve K, recording at this moment, the mill base fineness is 40 microns, because this prescription fineness expection setting value is smaller or equal to 80 microns, then shut valve K, valve J, suitably heighten the pressure set points (being set at 0.3MPa) of pneumatic diaphragm pump 1, reopen valve K after 1 minute, valve J, repeat above-mentioned detection, this time the mill base fineness is 80 microns, just meet the requirements, shut off valve K, valve J, open bleeder valve L, mill base is used as power with gravity and delivers into blending by pipeline and pack pot, sand milling production is carried out automatically, opened valve K in per 30～60 minutes, valve J, repeat once above-mentioned detecting operation, as long as pneumatic diaphragm pump 1 pressure is constant, the mill base flow that flows to the horizontal sand mill group is exactly constant, thereby fineness also will keep constant when in general producing same paint formulation.Treat that this process operations finishes (comprising cleaning) and close all valves of this operation and switch successively.

Embodiment two, the white alkyd finish of making solvent-borne type

1, earlier with the mill base after the premixed from the spice pot in pipeline is transported to enclosed filters, in the mesh size is 4～6 millimeters mesh screen, through totally-enclosed filter is preliminary filter after, select two horizontal sand mills series connection to use according to fineness requirement;

2, the pneumatic diaphragm pump 1 of mill base after the filtration on horizontal sand mill provides power to be transported to the horizontal sand mill group to carry out sand milling, turn down 2-1, the pressure set points (being set at 0.2MPa) of pneumatic diaphragm pump 1 on the 2-2 sand milling unit, open valve E, valve F, start pneumatic diaphragm pump 1 and horizontal sand mill 2-1, horizontal sand mill 2-1 work, open the valve H of fineness monitoring mouth 3 when opening gas sampling mouth 4 valve I, recording at this moment, the mill base fineness is 50 microns, because this finish paint prescription fineness expection setting value is 30 microns, shut valve I, valve H, open valve G, open the valve J of fineness monitoring mouthfuls 3 when directly starting horizontal sand mill 2-2 and opening the valve K of gas sampling mouth 4, recording the mill base fineness of coming out from valve J after 1 minute is the 25-30 micron, require this lacquer fineness to be not more than 30 microns according to prescription, just meet the requirements, shut off valve J, valve K, open bleeder valve L, mill base is utilized gravity to be used as power and is delivered into blending packing pot by pipeline, sand milling production is carried out automatically, opened valve J in per 30～60 minutes, valve K, repeat once above-mentioned detecting operation, when in general producing same paint formulation as long as pneumatic diaphragm pump 1 pressure is constant, the mill base flow that flows to the horizontal sand mill group is exactly constant, thereby fineness also will keep constant.Treat that this process operations finishes (comprising cleaning) and close all valves of this operation and switch successively.

This Totally-closed sand grinding technology can be as required or each manufacturing enterprise's existing equipment configuration condition, forms the fully-automatic production streamline and carry out full-automation production.

Also can with the agitating device that feeds intake of preceding working procedure, the the filtering and packaging of later process all adopts manual operations to carry out the semi-automatic production line of supporting composition to carry out semi-automation and produce, can reach the energy-conserving and environment-protective effect equally, manufacturing enterprise also can reach " the advanced enterprise of cleaner production " that represents advanced international level.

Claims (1)

1. the Totally-closed sand grinding technology of a coating material production is characterized in that production stage is:

(1), utilize gravity to be used as power in pipeline is transported to totally-enclosed filter from the spice pot mill base after the premixed earlier, employing mesh size is 4～6 millimeters a mesh screen, after the preliminary filtration of totally-enclosed filter, according to the different fineness requirement, selection enters the horizontal sand mill group, fineness requirement only needs to insert a horizontal sand mill at 50～120 microns, and fineness requirement is needing two horizontal sand mill series connection to use below 50 microns;

(2), the pneumatic diaphragm pump of mill base on horizontal sand mill after filtering provide power to be transported to the horizontal sand mill group to carry out sand milling, by the fineness monitoring mouthful detect fineness qualified after, under the gravity effect, directly enter blending packing pot by conveyance conduit again;

The step that detects fineness is: configure pneumatic diaphragm pump operating pressure setting value earlier, open pneumatic diaphragm pump preceding valve E, valve F simultaneously, start pneumatic diaphragm pump and horizontal sand mill group, open fineness monitoring mouth and corresponding gas sampling cover simultaneously, reach the regulation requirement until fineness to be measured, sand milling production is carried out automatically, the after this every valve that need open fineness monitoring mouth through 30～60 minutes, when opening fineness monitoring mouthful valve, also open the valve of gas sampling cover, carry out the one-time detection operation.

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