High-strength high-toughness unsaturated polyester resin for sheet molding compounds and preparation method of
A technology of sheet molding compound and polyester resin, which is applied in the field of polymer compound preparation, can solve the problems of hysteresis SMC material development and deep application, insufficient water resistance, weather resistance, and affecting the aesthetic effect of products, and achieve excellent thickening ability , Improving the water resistance and excellent yellowing resistance of the resin
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[0022] The preparation method of the high-strength and high-toughness unsaturated polyester resin for sheet molding compound described in this embodiment includes the following steps:
[0023] 1. Add isophthalic acid, tetrahydrophthalic anhydride, 2-methyl 1,3 propylene glycol, and neopentyl glycol to the reactor under the condition of a nitrogen flow rate of 2-6m3 / h, and raise the temperature to 180-210℃. React until the acid value reaches 8-12mgKOH / g;
[0024] 2. Cool the material to 140-150℃, add fumaric acid and methyl hydroquinone, heat up to 190-210℃, react until the acid value reaches 60-65 mgKOH / g, increase the nitrogen flow rate to 30 -40m3 / h, continue to react to 30-35 mgKOH / g; turn off the nitrogen, vacuum the reactor for 30-40 minutes, stop vacuuming, continue to flow in nitrogen, keep the nitrogen flow 36-40m3 / h, and react to the acid value Reaching 20-24mgKOH / g, cooling to 160-180°C to obtain unsaturated polyester;
[0025] 3. Add the above-prepared unsaturated polyes...
Example Embodiment
[0026] Embodiment two:
[0027] The high-strength and high-toughness unsaturated polyester resin for sheet molding compound described in this embodiment is composed of the following parts by weight: 225 parts by weight of tetrahydrophthalic anhydride, 525 parts of isophthalic acid, and 4750 parts of fumaric acid Parts, 800 parts of 2-methyl-1,3-propanediol, 3800 parts of neopentyl glycol, 800 parts of styrene, 4100 parts of isobutyl methacrylate, 3 parts of hydroquinone, 4 parts of methylhydroquinone, 2, 5 parts of 6-di-tert-butyl-p-cresol; its preparation method is the same as in Example 1.
Example Embodiment
[0028] Embodiment three:
[0029] The high-strength and high-toughness unsaturated polyester resin for sheet molding compound described in this embodiment is composed of the following parts by weight: 225 parts by weight of tetrahydrophthalic anhydride, 525 parts of isophthalic acid, and 4850 parts of fumaric acid Parts, 850 parts of 2-methyl-1,3-propanediol, 3750 parts of neopentyl glycol, 800 parts of styrene, 4100 parts of isobutyl methacrylate, 3 parts of hydroquinone, 4 parts of methylhydroquinone, 2, 5 parts of 6-di-tert-butyl-p-cresol; its preparation method is the same as in Example 1.
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