Method for synthesizing unsaturated polyester resin by utilizing glycerol and phthalic anhydride by-product
A technology of phthalic anhydride by-products and polyester resins, which is applied in the field of polymer material manufacturing, can solve the problems of high cost impact, cost increase, and insufficient product toughness, and achieve the effects of low cost, excellent performance, and easy control of molecular weight
Active Publication Date: 2013-07-24
ZHENJIANG UNION CHEM IND +1
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Problems solved by technology
For example, Chinese patent 201110113843.9 discloses a method for synthesizing unsaturated polyester resin using glycerol, mainly using monobasic acid (benzoic acid or glacial acetic acid), dibasic acid (fumaric acid, itaconic acid, maleic acid) etc.) and glycerin and some diols to synthesize unsaturated polyester resin, the price of benzoic acid and some diols used is high, which has a great impact on the cost, and there is no addition of phthalic anhydride in the product, which may cause insufficient toughness of the product
Chinese patent 200810028664.3 discloses an unsaturated polyester resin modified by phthalic anhydride by-products, mainly using phthalic anhydride by-products, maleic anhydride, phthalic anhydride, propylene glycol, ethylene glycol and diethylene glycol to synthesize unsaturated polyester resin, Although the waste of phthalic anhydride is effectively utilized, the use of a large amount of high-priced high-quality dihydric alcohols increases the cost, and due to the influence of the color depth of the by-product of phthalic anhydride, high-quality alcohols cannot effectively improve the color of the finished product
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[0009] Embodiments of the present invention are as follows:
[0010] In the reactor equipped with a thermometer, a distillation condensing device (with jacket), and a stirring device, add (the following are parts by mass) 20 parts of glycerin, 45 parts of phthalic anhydride by-products, 10 parts of fumaric acid, and 10 parts of maleic acid Alkenic anhydride, 15 parts of propylene glycol and 200-400ppm esterification catalyst phosphoric acid are heated to 160°C under stirring to discharge water. After holding the temperature for 2 hours, the temperature is raised to 215°C, and when the acid value reaches 62mgKOH / g, the temperature is lowered to below 180°C Add 800ppm of semi-refined wax and stir thoroughly, and finally dilute with 30% styrene to form a finished product.
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The invention relates to the preparation of a high polymer material and in particular relates to a method for synthesizing unsaturated polyester resin by utilizing glycerol and phthalic anhydride by-product. The method comprises the following steps of: adding 10-20 parts by weight of glycerol, 35-55 parts by weight of phthalic anhydride by-product, 10-15 parts by weight of fumaric acid, 5-7 parts by weight of maleic anhydride, 10-15 parts by weight of propylene glycol and 200ppm-400ppm of esterification catalyst to a reactor with a thermometer, a distillation condensing device and a stirring device; heating up to 155 DEG C to 165 DEG C for discharging water under stirring; heating up to 205 DEG C to 215 DEG C after preserving the heat for 2-3 hours; cooling to 180 DEG C or lower for adding auxiliary materials when an acid value is 50 mgKOH / g-65mgKOH / g through the reaction; and diluting by 25-35 parts by weight of styrene to obtain a finished product. During a reaction method, the method for synthesizing unsaturated polyester resin by utilizing glycerol and phthalic anhydride by-product is easy to control, low in cost, excellent in performances of synthesized novel unsaturated polyester resin and suitable for glass fiber reinforced composite materials.
Description
technical field [0001] The invention relates to the manufacture of polymer materials, in particular to a method for synthesizing unsaturated polyester resin by utilizing glycerin and phthalic anhydride by-products. Background technique [0002] Phthalic anhydride by-products refer to light boiling substances produced during the process of producing phthalic anhydride by o-xylene oxidation. The main components are phthalic anhydride (PA), benzoic acid (BA) and a small amount of unknown impurities. In the past production, it was sold as waste at an ultra-low price, wasting resources and burying hidden dangers for environmental pollution. Industrial grade glycerol is cheap and widely used in papermaking, printing, coatings and other fields. Because of its trihydroxyl structure, it reacts with dibasic acids at high temperatures, and its molecular weight is difficult to control. It is rarely used in the field of unsaturated resins. The price of conventional diols for synthesizin...
Claims
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Login to View More IPC IPC(8): C08F283/01C08G63/20
Inventor 陸中旭何朝赐吴荣泰
Owner ZHENJIANG UNION CHEM IND