Totally-closed sand grinding technology for coating production

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 qualified, 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 closing, 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

technical field [0001] The invention relates to a coating production method, in particular to a fully enclosed sanding process for coating production which is an important production link in solvent-based and water-based coatings. Background technique [0002] In recent years, with the development of society and economy, the country has also increased its requirements for environmental protection. On April 23, 2007, the National Development and Reform Commission announced the "Evaluation Index System for Cleaner Production in Paint Manufacturing Industry" drafted by the Chemical Cleaner Production Center ( Trial Implementation), the evaluation index system stipulates the cleanliness indicators of paint production enterprises in more detail, and divides the clean production level of enterprises into two levels according to the scores obtained from the comprehensive evaluation, that is, "advanced clean production enterprises" representing the domestic advanced level and "advanc...

AI Technical Summary

Problems solved by technology

[0005] To sum up, the various types of sanding processes widely used today are not truly fully enclosed, and the existing various forms of open work windows lead to sanding The VOC contained in the coating itself in the grinding workplace emits a large amount of VOC, and the heat generated during the sanding process accelerates the emission rate of VOC. The cleaning of the exposed part and the color change operation not only increase the workload of the workers, but also waste raw materials and increase Disadvantages such as production cost and increased waste disposal volume

Although the VOC in the open operation window can be collected, because a collection device with high ventilation is required, it is difficult and costly. It wastes materials and consumes energy. It is difficult for paint manufacturers to afford the cost of collection and treatment. Unorganized VOC emissions are common. , resulting in a strong smell in the sanding site and poor air quality, which reduces the intrinsic safety of the solvent-based coating production enterprises, and does not meet the requirements of the clean production evaluation index system of the coating manufacturing industry, which has become a key factor restricting the clean production of coating enterprises

[0006]Patent Application No. 02137086.9 "Paint Production Method" Although the various production processes are concentrated, the entire production process can be automated in a relatively closed state, reducing labor intensity. However, its production process is cumbersome, there are many intermediate links such as various feeding tanks and equipment pumps, and the operation period is long. Because it also uses a traditional basket sand mill for grinding, there is an open operation window, and there are still organic gases that are discharged outside. Environmental pollution and unsatisfactory working environment also fail to meet the requirements of "advanced clean production enterprises"

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