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Method for preparing modified alkyd resin

An alkyd resin and modification technology, which is applied in the field of polyester resin, can solve the problems of zero profit margin and increased product cost, and achieve the effects of short production cycle, energy saving, and overcoming the shortcomings of technology and cost

Inactive Publication Date: 2012-06-20
江苏三木化工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since last year, the prices of rosin and others have risen sharply, which has greatly increased the cost of the product, and the profit margin of the product is almost zero.

Method used

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  • Method for preparing modified alkyd resin
  • Method for preparing modified alkyd resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) Mix 24kg of ricinoleic acid, 29kg of glycerin, 30kg of phthalic anhydride, and 17kg of crude p-toluic acid into a stainless steel reaction kettle;

[0015] (2) Add 6kg of xylene and 0.08kg of hypophosphorous acid into the reaction vessel, seal the feeding port, open the vent valve, heat up and stir, gradually raise the temperature to 190°C for 2 hours in 6 hours, and then keep it at 200°C for 2 hours. When the acid value is below 21.5mgkOH / g, it is the end point of the reaction. After passing the test, the temperature is lowered, diluted with toluene, pressure filtered, and packaged;

[0016] The above crude p-toluic acid refers to p-toluic acid with a water content of 30wt%, and hypophosphorous acid is an aqueous solution of hypophosphorous acid with a concentration of 51wt%.

Embodiment 2

[0018] (1) Mix 37kg of ricinoleic acid, 22kg of glycerin, 31kg of phthalic anhydride, and 10kg of crude p-toluic acid into a stainless steel reaction kettle;

[0019] (2) Add 6kg of xylene and 0.06kg of hypophosphorous acid into the reaction vessel, seal the feeding port, open the vent valve, heat up and stir, gradually raise the temperature to 190°C for 2 hours in 6 hours, and then keep it warm at 208°C. When the acid value is below 21.5mgkOH / g, it is the end point of the reaction. After passing the test, the temperature is lowered, diluted with toluene, pressure filtered, and packaged;

[0020] The above crude p-toluic acid refers to p-toluic acid with a water content of 30wt%, and hypophosphorous acid is an aqueous solution of hypophosphorous acid with a concentration of 51wt%.

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Abstract

The invention adopts the technical scheme that a method for preparing modified alkyd resin comprises the special steps as follows: (1) mixing 23 to 37 percent by weight of ricinoleic acid, 21 to 29 percent by weight of glycerin, 29 to 31percent by weight of phthalic anhydride, 10 to 18 percent by weight of crude p-toluic acid and adding the mixed liquor into a reaction vessel; and (2) adding xylene and hypophosphorous accounting for 0.06 to 0.1 percent by weight of the mixed liquor obtained from the step (1) into the reaction vessel, increasing the temperature to 190 to 201 DEG C for thermal insulation and esterification, and cooling and diluting as long as the acid value is below 21.5 mgKOH / g in esterification. In the invention, the cost is low; and polyurethane varnish made of alkyd resin prepared through the invention can reach requirements of various properties.

Description

technical field [0001] The invention relates to the technical field of polyester resins, in particular to an oil-modified alkyd resin. Background technique [0002] There are many alkyd resins used in nitro lacquers, and non-drying oil-modified short-oil or medium-oil alkyd resins are the most commonly used resins in nitro lacquers. Using non-drying oil short oil alkyd resin can improve the performance of lacquer paint in many aspects: adhesion, flexibility, weather resistance, fullness and color retention. [0003] Usually the preparation method of short oil alkyd resin is by 25~35wt% soybean oil or ricinoleic acid, 18~30wt% rosin, greater than 23wt% phthalic anhydride, 2~4wt% maleic anhydride, 20~30wt% % of polyols (such as: glycerin or pentaerythritol, etc.), obtained through esterification. However, since last year, the prices of rosin and other products have risen sharply, which has greatly increased the cost of the product, and the profit margin of the product is alm...

Claims

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Application Information

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IPC IPC(8): C08G63/49C09D167/08
Inventor 杨树民
Owner 江苏三木化工股份有限公司
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