Alkyd resin for low-cost mixed paint and preparation method thereof
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An alkyd resin, low-cost technology, applied in the field of alkyd resin for low-cost blending paint and its preparation, can solve the problems of resin opacity, complex production process control, deep resin color, etc., achieve consistent performance, reduce cost, cost low effect
Inactive Publication Date: 2012-10-03
SHENYANG SANMU CHEM
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Problems solved by technology
[0003] In China, terephthalic acid, including purified terephthalic acid and crude terephthalic acid (such as pool materials, floor materials, etc.) is used instead of phthalic anhydride to prepare alkyd resins. Although the cost of resin products has been reduced, there are still many shortcomings, such as If crude terephthalic acid is used as raw material, the color of the resin is too dark, there are many impurities, the resin is opaque, and the production process is complicated to control. They only stay in terephthalic acid to partially replace phthalic anhydride, not all of them, so the cost reduction space is limited, and the promotion of alkyd resin produced by this method is greatly restricted.
Method used
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Embodiment 1
[0013] Put 23.1% soybean oil acid, 12.45% glycerin, 14.4% purified terephthalic acid, and 0.05% hypophosphorous acid into the reaction kettle, and raise the temperature at 225°C to 235°C for esterification until the resin is clear and transparent, and the acid value is below 8mgKOH / g , Viscosity 15~25s / 25℃, Grignard viscosity, then cool to 180℃, add 0.5% maleic anhydride, continue the reaction until the resin acid value is below 6mgKOH / g, viscosity 20~22s / 25℃, Grignard viscosity, Finally, cool and add 49.5% No. 200 solvent oil, and then dilute and discharge.
Embodiment 2
[0015] Put 24.65% soy oil, 10.88% trimethylolpropane, 13.81% purified terephthalic acid, and 0.05% hypophosphorous acid into the reaction kettle, and raise the temperature at 225°C to 235°C for esterification until the resin is clear and transparent, and the acid value Below 8mgKOH / g, viscosity 15~25s / 25℃, Grignard viscosity, then cool to 180℃, add 0.55% maleic anhydride, continue the reaction until the resin acid value is below 6mgKOH / g, viscosity 20~22s / 25℃, Grignard Until the viscosity is reached, finally cool and add 50.06% hydrogenated carbon nine solvent, dilute and discharge.
Embodiment 3
[0017] Put 25.48% linseed oil fatty acid, 13.55% glycerin, 12.1% purified terephthalic acid, and 0.05% hypophosphorous acid into the reaction kettle, and raise the temperature at 225℃~235℃ for esterification until the resin is clear and transparent, and the acid value is 8mgKOH / g Below, the viscosity is 15-25s / 25°C, Grignard viscosity, then cool to 180°C, add 0.65% phthalic anhydride, and continue the reaction until the resin acid value is below 6mgKOH / g, the viscosity is 20-22s / 25°C, Grignard viscosity, Finally, cool and add 48.17% No. 200 solvent oil, and then dilute and discharge.
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Abstract
The invention relates to an alkyd resin for a low-cost mixed paint and a preparation method thereof. The resin consists of the following components in percentage by weight: 23-26 percent of dry or semi-dry oil fatty acid, 10-14 percent of polyhydric alcohol, 12-15 percent of pure terephthalic acid, 0.5-0.7 percent of acid anhydride, 0.05-0.1 percent of hypophosphorous acid and 48-52 percent of a letdown solvent. The preparation method comprises the following steps of: feeding dry or semi-dry oil fatty acid, polyhydric alcohol, pure terephthalic acid and hypophosphorous acid into a reaction kettle; heating to 225-235 DEG C for esterifying till a resin is clear and transparent, the acid value is below 8mgKOH/g, and the viscosity is 15-25s/25 DEG C at Grignard viscosity; cooling to 180 DEG C; adding the acid anhydride; continually performing an esterification reaction at 180-200 DEG C till the acid value of the resin is below 6mgKOH/g, and the viscosity is 20-22s/25 DEG C at Grignard viscosity; and cooling, adding the letdown solvent, diluting and discharging. Compared with the conventional phthalic anhydride alkyd resin, the alkyd resin has the advantages: the cost is very low, and the properties such as color, luster, impact and the like of a final paint film are basically consistent.
Description
technical field [0001] The invention relates to the field of alkyd resin and its preparation, and in particular provides a low-cost alkyd resin for blending paint and a preparation method thereof. Background technique [0002] Alkyd resin is a widely used synthetic resin for coatings, which can be used as primers, topcoats, and varnishes. Traditional alkyd resins are mainly phthalic anhydride alkyd resins, and most of the raw materials used in its production come from petroleum. Due to the impact of oil prices, the raw material prices of alkyd resins are relatively high. For this reason, it has become an important direction for people to research and develop alkyd resins and market promotion by exploring and adopting lower-priced substitute raw materials and reducing costs. [0003] In China, terephthalic acid, including purified terephthalic acid and crude terephthalic acid (such as pool materials, floor materials, etc.) is used instead of phthalic anhydride to prepare al...
Claims
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