An improved alkyd resin manufacturing process in which the alkyd resin is prepared by esterifying a polybasic acid and a polyhydric alcohol under reaction temperature conditions and water from the esterification is removed from the process; in the event gelation of the alkyd resin occurs in the process, the improvement that is used is the addition of sufficient water or steam while the alkyd resin is maintained at about reaction temperature conditions to reverse the gelation of the alkyd resin to form a gel-free liquid composition of the alkyd resin. Also, water or steam can be used in an alkyd resin manufacturing process to prevent or retard gelation of the resin. In a process for the manufacture of a liquid alkyd resin composition which comprises esterifying a polybasic acid with a polyhydric alcohol under reaction temperature conditions and removing water as formed in the process; the improvement used therewith which comprises the addition of sufficient steam at a rate of 0.05 to 3.0% by weight, based on the weight of the alkyd resin, per minute to retard gelation of the alkyd resin to form a gel-free composition of the alkyd resin while maintaining the alkyd resin at reaction temperature conditions of about 200°-275° C. BACKGROUND OF THE INVENTION This invention is related to a process for the manufacture of alkyd resins and in particular to an improvement in this process. Conventional processes for the preparation of alkyd resins use an esterification reaction to react a polybasic acid and a polyhydric alcohol, and usually, an esterification catalyst is used. The reaction either uses a solvent or can be accomplished without the presence of a solvent. A problem arises at the completion of the process, since the reaction must be stopped rapidly.

Alkyd resin: Alkyd resin. Yielding a tack-free film. A typical alkyd paint consists of the oil-modified polyester to form the coating film.

One technique that is used is to rapidly dissolve the resin in a solvent for the resin which is at a relatively low temperature, and this stops the reaction. If the reaction is not stopped, the resin will gel, crosslink, and harden in the reaction vessel, and very costly maintenance is required to remove the resin. At present, there is no technique known to reverse gelation of an alkyd resin to remove the resin from the reaction vessel or to make a useable product from a gelled alkyd resin. The novel process of this invention not only stops the gelation of an alkyd resin, but reverses this gelation to form a composition suitable for use in paints and varnishes. Referenced by Citing Patent Filing date Publication date Applicant Title * Dec 27, 1977 Apr 10, 1979 The Dow Chemical Company Polyester resins containing dicyclopentadiene * Jan 18, 1979 Sep 23, 1980 E. Chiang Elements Of Dynamic Optimization Pdf File. Du Pont De Nemours And Company Alkyd-monomer high-solids coating composition * Jan 18, 1979 Sep 30, 1980 E. Du Pont De Nemours And Company Alkyd-monomer high-solids coating process * Dec 18, 1978 Feb 17, 1981 E.

Du Pont De Nemours And Company Water-borne alkyds * Mar 24, 1980 Oct 13, 1981 E. Du Pont De Nemours And Company Accelerated process for making nonlinear polyesters * Sep 23, 1981 Mar 22, 1983 Dow Corning Corporation Non-precondensed silicone-alkyd resins and a method for their preparation.

There are several reasons why industrial engineers need to optimize process layout designs. This paper points out the justification and discusses the qualitative and quantitative techniques involved in the determination of an optimal process layout for a pilot alkyd resin and its end products manufacturing system. It also spotlights practical decisions required for achieving optimality in the design process.

It is the belief of the authors that with some improvements on the final layout, our proposed layout will be a ballpark of eco-factory moored on green manufacturing. Abstract: A chromium-free conversion coating for AZ91D magnesium alloys has been obtained by using a phosphate-permanganate solution. Examinations have been carried out on the conversion coating for morphology, composition, adhesion force and corrosion resistance. Results show that the conversion coatings are relatively uniform and continuous, with thickness from 7µm to 10µm. They exhibit good adhesion to matrix and have some non-penetrate tiny holes on the surface. The main elements of the conversion coating of AZ91D alloy are Mg、O、P、K、Al、Mn. Results of corrosion resistance test indicate that the corrosion resistance of the conversion coating by phosphate-permanganate solution is in match to that of the conversion coating formed in a chromate solution, but for the corrosion resistance after painting, the former is better than the later.

Abstract: The results of a study into the design for manufacture of a chemical batch reactor for the synthesis of alkyd resin destined for surface-coating production is presented. The procedures for determining the key geometrical parameters of the reactor are explained. Frogmore Print Distributor V4.3.2119. This paper presents the application of fertile innovation to the design and development of chemical batch reactor that uses boiler steam in conjunction with heat from efficient wood stove to achieve constant supply of heat, sustained at about 2500C.

The design concept is governed by an analytical model developed and which specifies the optimal reactor geometries that would afford efficient heat and mass transfer. Residence time for our reactor is five (5) hours as against eight (8) hours associated with laboratory scale reactors. The performance of the chemical batch reactor during a preliminary test-run was evaluated in terms of the well over 3000C processing temperature achieved and from the result rises hope eternal. Abstract: In the development of modern cities, building decoration materials are like a hundred flowers in bloom with the rapid development of society and technology. Coating-Architecture becomes the conspicuous central point for its distinctive charm. This paper focuses on the superiorities of Coating-Architecture in various angels, such as architectural aesthetics, economy, construction and maintenance. It indicates Coating-Architecture do possesses an irreplaceable potential in the urban development.