Method for preparing exterior wall paint by utilizing paper mill sludge

Abstract

The invention provides a method for preparing exterior wall paint by utilizing paper mill sludge. The exterior wall paint is prepared from the following components in a paint dispersion machine: 2.5 to 3.5 parts of a polyacrylate emulsion with the solid content being 50%, 55 to 65 parts of a sodium carboxymethyl cellulose aqueous solution with the solid content being 2%, paper mill sludge with the dry component being 25 to 30 parts, 2.5 to 3.5 parts of pigment, 0.2 part of a defoaming agent, and 1 part of a preservative; the preparation process of the exterior wall paint in the paint dispersion machine is that the sodium carboxymethyl cellulose solution is added into the paint dispersion machine, and the paper mill sludge, the pigment, the defoaming agent and the preservative are added in sequence at the revolving speed of 1000 to 2000 rpm (revolutions per minute), and stirred for 30 to 5o minutes; then the polyacrylate emulsion is added, and stirred for 15 to 20 minutes to obtain the exterior wall paint. The preparation method of the paint provided by the invention has the characteristics that the operation is simple and easy operation and the quality and performance of the paint are excellent, thereby providing an effective way for resource utilization of paper mill sludge waste.

Description

technical field

[0001] The invention belongs to the field of environmental protection, and relates to a method for preparing exterior wall coatings by using sludge by-products produced in the wastewater treatment process of pulp and papermaking enterprises. Background technique

[0002] Papermaking sludge is a kind of solid waste produced in the process of pulping and papermaking, which has the characteristics of complex composition, pollution and difficulty in disposal. The traditional treatment methods for papermaking sludge generally include incineration, landfill, and deep sea disposal, etc., but these methods have problems such as secondary pollution to the environment, land occupation, and high processing costs. With the increasingly stringent national requirements for industrial solid waste disposal, how to use an effective method to recycle papermaking sludge is an environmental protection problem that needs to be solved urgently in the current pulp and paper industr...