ALKYD RESIN PRODUCTION PROCESS FILETYPE PDF

Alkyd Resin Production Process Filetype Pdf Editor Average ratng: 4,8/5 reviews. Download Alkyd resin chemistry pdf file: Read Online. Modern Technology of Synthetic Resins & Their Applications Author: NIIR Board. Modern Technology of Synthetic Resins & Their Applications. CORPORATION/. Design of Process Layout for a Pilot Alkyd Resin Production Plant arrangement to evaluate the Alkyd Resin Production Process Filetype Pdf To Jpg Alkyd.

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This invention relates to processes for producing alkyd resins using polyester resins which have been recovered from waste materials such as disused PET bottles and regenerated. Heretofore, use of terephthalic acid as the dibasic acid component, which is one of the starting materials of alkyd resins, was more costly than using phthalic acid or phthalic anhydride and the resulting resin was apt to become turbid or develop occurrence of foreign matters. Hence, normally terephthalic acid is not used for alkyd resin production or, if used, in only minor amount.

On the other hand, recently disposal of waste is becoming a serious issue and utilization of disused PET bottles by recycling is under study. A production method of alkyd resins using polyester resins which have been recovered from waste materials such as disused PET bottles and regenerated is described in, for example, Hei 11 A-JP.

Said method comprises subjecting recovered polyester resin and an alkyd resin oligomer having a molecular weight not higher than 5, and containing hydroxyl groups to depolymerization and transesterification. However, this method is subject to a number of problems such that it requires advance synthesis of the alkyd resin oligomer, requires many hours for the depolymerization and filtration of ultimately obtained alkyd resin causes occurrence of large amount of filtration residue, because the amount of the alcohol component in the occasion of depolymerization is too low to sufficiently depolymerize the recovered polyester resin.

The object of the present invention is to provide processes for producing transparent alkyd resins which are substantially free of foreign matters and filtration residue within a short time, using the polyester resins which have been recovered from waste materials and regenerated.

According to the invention, furthermore, paint compositions containing the alkyd resins which are produced by the above first or second process are provided. In particular, recycled polyethylene terephthalate is suitable. The regenerated PES is normally used in the form of chips or pulverized product. According to the first process of the invention, first such regenerated PES is dissolved in a mixture of a tetra- or higher hydric alcohol and a tri- or lower polyhydric alcohol, and its depolymerization is conducted in the presence of a depolymerization catalyst.

Examples of tetra- or higher hydric alcohols useful in said alcohol mixture include diglycerine, triglycerine, pentaerythritol, dipentaerythritol and sorbitol. Of those, pentaerythritol is particularly suitable because of favorable curing and drying property of the painted film of the paint compositions in which the resulting alkyd resin is used.

Also examples of tri- or lower polyhydric alcohols include: Of those, glycerine, ethylene glycol, diethylene glycol, triethylene glycol and propylene glycol are particularly suitable, from the standpoints of depolymerization ability as used in mixtures with said tetra- or higher hydric alcohols e.

In the alcohol mixture, blend ratio of the tetra- or higher hydric alcohol to the tri- or lower polyhydric alcohol is conveniently within a range of 0. On the other hand, in the second process of the invention, said regenerated PES is dissolved in a mixture of an alcohol.

Examples of the oil and fat, i. In particular, drying or semi-drying oils having iodine values of at least are preferred, inter alia, soybean oil and tall oil are advantageous.

As fatty acids, those of soybean oil, safflower oil, linseed oil, tall oil, coconut oil, palm kernel oil, castor oil, dehydrated castor oil, fish oil, and tung oil may be named.

Of those fatty acids, those of drying oils or semi-drying oils having iodine values of at leastinter alia, those of soybean oil and tall oil, are preferred. This esterification reaction can be conveniently carried out by any method known per se, in the presence of an esterification catalyst such as zinc acetate, litharge, dibutyltin oxide and the like. Polyhydric alcohols which are normally solid, such as pentaerythritol, dissolve in the system upon said esterification reaction with fatty acid, to facilitate prkcess dissolving and deploymerization of regenerated PES in the next step.

flow chart of alkyd resin production

Also advance blending of liquid oil and fat in said mixture enables stable progress of the esterification reaction between polyhydric alcohol and fatty acid. As examples of depolymerization catalyst which is used for promoting depolymerization of regenerated PES in the first and second processes of the invention, monobutyltin hydroxide, dibutyltin oxide, monobutyltinethyl hexanoate, dibutyltin dilaurate, stannous oxide, tin acetate, zinc acetate, manganese acetate, cobalt acetate, calcium acetate, lead acetate, antimony trioxide, tetrabutyl titanate and tetraisopropyl titanate maybe named.

The use rate of the depolymerizaton catalyst in the first process is, per weight parts of the total sum of the regenerated PES and alcohol mixture, conveniently within a range of normally 0. In the first process of the invention, the depolymerization method producgion regenerated PES by dissolving it in an alcohol mixture is subject to no critical limitation, so long as the regenerated PES can be dissolved in the alcohol mixture and the depolymerization can be effected.

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According to the first process of the invention, after conducting the dissolution and depolymerization of the regenerated PES, a polybasic acid component and fatty acid component are added to the system to conduct an esterification reaction to form an alkyd resin. In said production of alkyd resin, coloring in the formed alkyd resin can be inhibited by adding to the depolymerization product of the regenerated PES a minor amount, e.

As examples of the phosphorus compound, phosphoric acid, phosphorous acid and hypophosphorous procsss and alkyl esters or phenyl esters of these acids e. As the polybasic acid component, those normally used as the acid component for forming alkyd pdoduction can be similarly used.

Of those, dibasic acids and their C 1 -C 6 in particular, C 1 -C 4 alkyl esters are preferred. As the fatty acid component to be used in the alkyd resin production, fatty acid, oil and fat, and the like may be named. As fatty acid, for example, soybean oil fatty acid, safflower oil fatty acid, linseed oil fatty acid, tall oil fatty acid, coconut oil fatty acid, palm kernel oil fatty acid, castor oil fatty acid, dehydrated castor oil fatty acid, fish oil fatty acid and tung oil fatty acid may be named.

As examples of useful oil and fat, esters of above fatty acids with glycerine can be named, such as soybean oil, safflower oil, linseed oil, tall oil, coconut oil, palm kernel oil, castor oil, dehydrated ptoduction oil, fish oil and tung oil and the like.

Of those fatty acid component, fatty acids of drying oils or semi-drying oils having iodine values of at leastinter alia, soybean oil fatty acid and tall oil fatty acid, are preferred. It is also preferred to use the polybasic acid component and the fatty acid component at such ratios that the carboxyl fuletype numbers in the sum of the polybasic acid component and the fatty acid component per one hydroxyl equivalent in the alcohol mixture falls within a range of 0.

The esterification reaction for obtaining alkyd resin following the first process of the present invention can be conducted under esterification reaction conditions known per se. As catalyst for the esterification reaction, those earlier named as examples of depolymerization catalyst can be used. The use rate of such esterification catalyst is normally conveniently within a range of 0. Proudction method 2 is more convenient, in respect of depolymerizability of regenerated PES.

Depolymerization conditions of regenerated PES are not subject to critical limitations, so long as they allow the depolymerization using a depolymerization catalyst. According to the second process of the present invention. It is also convenient for waterproof property and physical properties of coated film when made dry coated film, to make the equivalent number of carboxyl group s in the polybasic acid component per equivalent of hydroxyl group in said alcohol component 0.

The esterification reaction for obtaining an alkyd resin following the second process of the present invention can be conducted under esterification reaction conditions known per se. As the esterification filetypee, those earlier named as examples of depolymerization catalyst can be used. Suitable blend ratio of the esterification catalyst is normally 0. In the production of alkyd resin, coloration of formed alkyd resin can be inhibited by adding to the depolymerization product of regenerated PES, in advance of the esterification reaction, a minor amount, e.

As the phosphorus compound, for example, phosphoric acid, phosphorous acid, hypophosphorous acid, alkyl esters or phenyl esters of these acids e. In the above-described first and second processes, after termination of the esterification reaction, the alkyd resin is normally cooled and may be recovered as it is.

Whereas, filetyp improving filterability and handling workability, the resin may be diluted with organic solvent and recovered. The kind of organic solvent is not particularly limited, so long as it can dissolve the alkyd resin. Those alkyd resins obtained by the first and second processes of the present invention are excellent in solubility in organic solvent, are soluble in even such weak solvent as mineral spirits although they contain terephthalic acid component, and are useful as resin binder in paint compositions.

Recently overcoatability is attached greater importance and alkyd resins soluble in weak solvent are highly evaluated. The alkyd resins obtained by the processes of the present invention well meet this purpose. Of the alkyd resins obtained by the processes of the present invention, those in which drying oil fatty acids or semi-drying oil fatty acids are used as the fatty acid excel in oxidation-drying property and are conveniently used as resins for room temperature-curing type paints.

Where they are used as resins for room temperature-curing type paints, the drying property can be still improved by concurrent proceds of metal compound dryers filetyype as cobalt naphthenate, zirconium naphthenate, lead naphthenate and the like. The alkyd resins obtained by the processes of the present invention, in particular, those in which saturated fatty acids are used as the fatty acid, can be conveniently used as resins for thermosetting type pproduction, in combination with curing agents reactable with hydroxyl groups, such as amino resins like melamine resin, polyisocyanate compound, epoxy compound and the like.

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Paint compositions containing the alkyd resins obtained by the processes of the present invention can be prepared by methods known per se, provided that an alkyd resin of the invention is used as at least a part of the resin binder.

At this time point the pentaerythritol was dissolved, and into which 1. At that time point the pentaerythritol was dissolved, and into which 5 parts of zinc acetate and 5 parts of litharge were charged, and then parts of regenerated polyethylene terephthalate regenerated PET was charged.

The system was maintained at the same temperature for an hour to effect depolymerization of the regenerated PET. At that time point the pentaerythritol was dissolved, into which 0. Properties of the obtained resins are shown in Table fkletype. With parts each of the alkyd resin solutions as obtained in above Examples and Comparative Examples, 0.

The test results are shown in Table 2. Into the system 5. Then conducting dehydration condensation reaction at said temperature, an almyd resin was obtained. In Example 10, 0. Example 8 was repeated except that 2. Maintaining the same temperature for 4 hours, an ester-interchange reaction of the soybean oil alcoholysis and depolymerization of the regenerated PET were simultaneously carried out.

The test results were as given in Table 4. Maintaining said temperature for 2 hours, depolymerization of the regenerated PET was conducted. Example 20 was repeated except that filrtype. The test results are shown in the following Table 6. According to the processes of the present invention, transparent alkyd resins, which are nearly free of occurrence of foreign matters or filtration residues, can be prepared within a short time, using polyester resins which are recovered from waste materials and regenerated.

The processes of the invention utilize waste materials and, therefore, enable recycled utilization of disused PET bottles and the like. Also alkyd resins which are obtained through the processes of the invention can be conveniently used as resins for room temperature-curing type paints, or those for thermosetting type paints, in combination with curing agents.

Furthermore, the alkyd resins obtained by the processes of the invention are transparent and free of turbidity, although they contain terephthalic acid component, and are soluble in weak solvent such as mineral spirits.

The resins, therefore, can be conveniently used also as resins for paints for the use where overcoatability is required. A SumoBrain Solutions Company. Search Expert Search Quick Search.

Process for producing alkyd resin. United States Patent Processes for producing within a short time transparent alkyd resins pocess are substantially free of occurrence of foreign matters or filtration residues are disclosed, which comprise depolymerizing polyester resins whose chief starting material is terephthalic acid and which have been recovered provess waste materials and regenerated, with use of a polyhydric alcohol component having tetra- or higher hydric alcohol, and thereafter adding thereto a polybasic acid component and if necessary a fatty acid component to effect an esterification reaction.

Filetyp for automatic bibliography generation. What is claimed is: A process according to claim 1 or 2, in which the polyester resin is recycled polyethylene terephthalate. A process according to claim 1 or 2, in which the tetra- or higher hydric alcohol is selected from the group consisting of diglycerine, triglycerine, pentaerythritol, dipentaerythritol and sorbitol.

Alkyd Resin Production Process Filetype Pdf

A process according to claim 1 or 2, in which the tetra- or higher hydric alcohol is pentaerythritol. A process according to claim 1 or 2, in which the tri- or lower polyhydric alcohol is selected from the group consisting of trimethylolpropane, trimethylolethane, glycerine, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, neopentyl glycol, 1,6-hexanediol and 1.

A process according to claim 1 or 2, in which the tri- or lower polyhydric alcohol is glycerine, ethylene glycol, diethylene glycol, triethylene glycol or propylene glycol. A process according to claim 2, in which the oil and fat is semi-drying oil or drying oil, and the fatty acid is semi-drying oil fatty acid or drying oil fatty acid. A process according to claim 1, in which the polyester resin is used in an amount of parts by weight per parts by weight in total of the polyester resin and the alcohol mixture.

A process according to claim 1 or 2, in which the depolymerization catalyst is selected from the group consisting of monobutyltin hydroxide, dibutyltin oxide, monobutyltinethyl hexanoate, dibutyltin dilaurate, stannous oxide, tin acetate, zinc acetate, manganese acetate, cobalt acetate, calcium acetate, lead acetate, antimony trioxide, tetrabutyl titanate and tetraisopropyl titanate.

A process according to claim 1, in which the depolymerization catalyst is used in an amount ranging from 0.

A process according to claim 2, in which the depolymerization catalyst is used in an amount ranging from 0. A process according to claim 1 or 2, in which a minor amount of a phosphorus compound is added to the depolymerization product.

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