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Isocyanate modified alkyd resin and preparation method thereof

A technology of isocyanate and alkyd resin, applied in the direction of polyester coating, coating, etc., can solve the problems of slow drying speed of alkyd resin and low hardness of coating film, and achieve the effect of good market prospect

Active Publication Date: 2012-08-22
UNION FOSHAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because alkyd resin has many defects such as slow drying speed, low hardness of coating film, wear resistance, durability, water resistance, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] According to Example 1 in Table 1, vegetable oil and pentaerythritol were added to the reaction kettle according to the weight ratio of the formula to raise the temperature. When the temperature rose to 120°C, LiOH was added, and the reaction was kept at 240°C until the end of alcoholysis; when the temperature was lowered, phthalic anhydride and xylene were added to perform esterification. reaction to the end, add 200 # The solvent oil is dilute for later use; when the temperature drops to about 40°C, slowly add the pre-mixed isocyanate and xylene dropwise, after adding, keep warm at 60°C for 1 hour, then keep warm at 90°C until the viscosity is qualified; cool down to 60°C , Add the terminator butanol, stir for 0.5h, and filter to obtain the isocyanate-modified alkyd resin.

Embodiment 2

[0021] Example 2, Example 3 The preparation steps refer to Example 1.

[0022] According to relevant national standards, the basic properties of the isocyanate-modified alkyd resin of the present invention were tested, and the test results are shown in Table 2.

[0023] Table 2 Test results of basic properties of isocyanate-modified alkyd resin

[0024] Test items test result Inspection standards Color (iron-cobalt colorimetric), number ≤10 GB / T1722-1992 Appearance and Transparency Transparent without mechanical impurities GB / T1721-1979 Fineness, μm ≤20 GB / T1724-1989 Viscosity (tu-4 cups), s 150～200 GB / T1723-1993 Solid content, % 50±2 GB / T1725-1989 Acid value, mgKOH / g 1～2 HG 2-569-1977

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PUM

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Abstract

The invention relates to isocyanate modified alkyd resin and a preparation method thereof. Isocyanate is utilized to modify alkyd resin, and the alkyd resin containing an ammonia ester structure is synthesized. The basic formula comprises, by weight: 20-33% of plant oil, 5-8% of polyatomic alcohol, 2-8% of organic acid anhydride, 5-10% of the isocyanate, 0.02-0.5% of catalyst, 35-50% of solvent and 3-8% of terminator. Varnish and enamel paint prepared by the isocyanate modified alkyd resin are better than ordinary middle-long-oil-degree alkyd resin paint in aspects of dryness, hardness, water resistance and the like, and are better than double-component polyurethane paint in aspects of toxicity, application property, odor and the like. The isocyanate modified alkyd resin is widely applied to the surfaces of products made of wood, metal, plastic and the like to have functions of protection and decoration. Due to the fact that the isocyanate modified alkyd resin is both hard and soft, the isocyanate modified alkyd resin has certain resistance to stone strike, can serve as primer and repair paint of agricultural vehicles and trucks, and has good market prospects accordingly.

Description

technical field [0001] The invention relates to an isocyanate-modified alkyd resin and a preparation method thereof, specifically refers to introducing a urethane bond into a commonly used alcohol resin to endow the modified resin with quick-drying properties, hardness, aging resistance and wear resistance . Background technique [0002] Alkyd resin is one of the most widely used synthetic resins for paints. The usual alkyd resin is synthesized from polyacids, polyols and vegetable oils (fatty acids). In recent years, in order to meet different performance requirements, the variety of modified alkyd resins has increased, including modified alkyd resins such as rosin, styrene, acrylic acid, and silicone. Because alkyd resin has many defects such as slow drying speed, low coating film hardness, wear resistance, durability, and water resistance. Contents of the invention [0003] The invention aims to provide an economical, practical, and excellent performance isocyanate-mo...

Claims

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Application Information

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IPC IPC(8): C08G63/685C09D167/08
Inventor 许钧强康伦国欧永杰
Owner UNION FOSHAN CHEM
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