Preparation method of polylactic acid and product thereof
The invention discloses a preparation method of polylactic acid and a product thereof, and the preparation method comprises the following steps: pre-dewatering lactic acid under the condition of a closed system to obtain a dewatered lactic acid raw material; the method comprises the following steps:...
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| creator | ZHANG JIABAO LI JUAN MENG ZHENGHUA GAO CHENGTAO LUO SHANSHAN LIAO LONGFENG FAN JUNHUA |
| description | The invention discloses a preparation method of polylactic acid and a product thereof, and the preparation method comprises the following steps: pre-dewatering lactic acid under the condition of a closed system to obtain a dewatered lactic acid raw material; the method comprises the following steps: physically blending a dehydrated lactic acid raw material and a tin catalyst at room temperature, and stirring and reacting for 2-24 hours at the temperature of 80-130 DEG C and the pressure of 0.01-0.08 MPa; the pressure is reduced to 2-300 Pa, the temperature is increased to 150-190 DEG C, stirring reaction continues to be conducted for 24-36 h, and an obtained viscous homogeneous solution is purified and dried to obtain a polylactic acid product. The invention provides the preparation method of the polylactic acid, the polylactic acid is formed by one-step direct melt polycondensation through regulation and control of the catalyst and the process, and the method for synthesizing the polylactic acid from the lac |
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The invention provides the preparation method of the polylactic acid, the polylactic acid is formed by one-step direct melt polycondensation through regulation and control of the catalyst and the process, and the method for synthesizing the polylactic acid from the lac</abstract><oa>free_for_read</oa></addata></record> |
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| subjects | CHEMISTRY COMPOSITIONS BASED THEREON MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP |
| title | Preparation method of polylactic acid and product thereof |
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