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Alkyd resin for metal coiled material back paint

A technology of coil back coating and alkyd resin, applied in the direction of coating, polyester coating, etc., can solve the problems of poor bending processability and friction resistance, long transparent time of materials, deep product color, etc., and achieve bending processability Good, shorten the transparent time of the material, reduce the effect of oxidative discoloration

Inactive Publication Date: 2013-03-27
江苏三木化工股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, bending workability and friction resistance (MEK friction) are also relatively poor, and it can only be used for coiled aluminum, but not for coiled steel; secondly, high-temperature baking is prone to yellowing and affects appearance; thirdly, the preparation method is relatively inferior. The solvent method process in which the reflux solvent is used to bring out the esterification water is mostly used. Although the material loss is small and the product color is light, the material is transparent for a long time and the production cycle is long; if the melting method is used, although the material is transparent faster, the material loss is greater. , the resulting product is dark in color

Method used

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  • Alkyd resin for metal coiled material back paint
  • Alkyd resin for metal coiled material back paint
  • Alkyd resin for metal coiled material back paint

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0021] Embodiment 1: 29wt% coconut oil acid, 9wt% phthalic anhydride, 27wt% glycerol, 8wt% benzoic acid, 24wt% purified terephthalic acid, 3wt% trimethylolpropane, and 0.07wt% hypophosphorous acid Catalyst, put into the stainless steel reactor, pass CO 2 , start stirring, heat up to 180°C for 1 hour, then gradually heat up to 237±2°C, keep warm until the material is transparent, then cool down to 210-215°C and pass CO 2 , slowly add xylene with a material amount of 3wt%, keep reflux until the central control is qualified, cool down, discharge, dilute, press filter, and pack.

Embodiment 2

[0022] Embodiment 2: 37wt% coconut oil acid, 6wt% phthalic anhydride, 22wt% glycerol, 3wt% benzoic acid, 24wt% purified terephthalic acid, 8wt% trimethylolpropane, and 0.06wt% hypophosphorous acid Catalyst, put into the stainless steel reactor, pass CO 2 , start stirring, heat up to 180°C for 1 hour, then gradually heat up to 237±2°C, keep warm until the material is transparent, then cool down to 210-215°C and pass CO 2 , slowly add xylene with a material amount of 3wt%, keep reflux until the central control is qualified, cool down, discharge, dilute, press filter, and pack.

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Abstract

The invention relates to an improvement of alkyd resin for metal coiled material protective coating (back paint) and a preparation method thereof; the alkyd resin is characterized in that: the alkyd resin is formed by esterification of 28-38wt% of coconut oleic acid or soya-bean oil fatty acid, 22-30wt% of phthalic anhydride, 22-30wt% of glycerine, 3-8wt% of benzoic acid, 24-33wt% of terephthalic acid, 3-8wt% of trimethylolpropane, and usual amount of hypophosphorous acid catalyst. The molecular structure of the alkyd resin obtained by reaction is changed, the flexible processability and solvent-resistance frictional property are improved, and the alkyd resin can be applied to steel coils; in addition, the alkyd resin has light color, and resistance to yellowing when baked at high temperature, and the physical-chemistry index and application performance are superior to the performance of products obtained by m-phthalic acid, soya-bean oil fatty acid and organic tin catalyst in the prior art; the alkyd resin not only can be used for back paint of metal coiled material (particularly for steel coil), but also can be applied to common drying paint.

Description

technical field [0001] The present invention is the improvement of the alkyd resin used for protective coating (back paint) of metal coils and the preparation method thereof. Background technique [0002] Alkyd resin has become the largest and most widely used synthetic resin in coatings because of its unique advantages such as abundant raw material sources, many varieties, wide application, good performance, and low price. When used as a baking varnish, the hydroxyl and carboxyl groups of the alkyd resin molecules can undergo condensation reactions with the methylol and alkoxy groups in the amino resin molecules during baking. During the baking process, the amino resin plays the role of crosslinking and curing, while the alkyd resin plays the role of providing polycondensation groups, toughening and increasing adhesion, and the formed paint film has better hardness, chemical resistance and weather resistance. [0003] The above-mentioned characteristics of alkyd resin can ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/49C08G63/87C09D167/08
Inventor 杨树民杨敏辉
Owner 江苏三木化工股份有限公司
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