Test method based on supercritical carbon dioxide differential scanning calorimeter
A technology of differential scanning calorimetry and carbon dioxide, applied in the direction of thermal development of materials
Active Publication Date: 2021-05-14
ZHEJIANG UNIV
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Problems solved by technology
Therefore, we invented a supercritical carbon dioxide differential scanning calorimeter and its testing method, which solved the problem of material foaming temperature selection
Method used
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Embodiment 1
[0057] Three grades of polypropylene raw materials were selected, and the melting points of the raw materials were measured under the conditions of 8MPa, 10MPa, and 12MPa supercritical carbon dioxide respectively. The preheating temperature was 70°C, the temperature range was 70-190°C, and the heating rate was 10°C / min. Test curve such as figure 2 As shown, the results are shown in Table 1. Due to the plasticizing effect of carbon dioxide, the melting point of polypropylene tends to decrease gradually as the pressure increases. The data obtained in this experiment provide key support for the large-scale foaming processing of polypropylene in the reactor.
[0058] The melting point of different grades of polypropylene in the supercritical carbon dioxide environment of table 1
[0059]
[0060] This embodiment takes the application of foaming materials as an example, which can provide strong data support for the precise selection of foaming temperature. However, the applic...
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Abstract
The invention discloses a testing method based on a supercritical carbon dioxide differential scanning calorimeter. The instrument includes cylinders and siphons, booster pumps, furnaces and control systems. The method is to use an aluminum crucible to prepare samples and place holes in the furnace body, then set the system pressure to be measured, and at the same time preheat the furnace body at 50-80°C, and pressurize the carbon dioxide in the cylinder to the furnace through a siphon tube and a booster pump. After reaching the set supercritical pressure, stop the preheating of the furnace body and measure the heat of reaction of the sample according to the set temperature program. Supercritical carbon dioxide has a strong dissolving ability and is an ideal solvent in many fields. However, supercritical carbon dioxide looks like gas but not gas, and it seems like liquid but not liquid. It is very difficult to control the pressure and sample injection. The invention adopts a siphon tube and a high-pressure plunger pump to solve the feeding problem of the supercritical carbon dioxide differential scanning calorimeter, and makes the pressure stable during the test process by means of furnace body preheating and carbon dioxide pre-storage, thereby obtaining reliable data.
Description
technical field [0001] The invention relates to calorimetric analysis of a supercritical carbon dioxide environment, in particular to a test method for a complete set of equipment based on a differential scanning calorimeter. Background technique [0002] supercritical carbon dioxide (CO 2 ) has a critical temperature of 31.3°C and a pressure of 7.38 megapascals (MPa). Its density is close to that of a liquid and its viscosity is close to that of a gas, so it has both the rapid diffusion of gas and the strong solubility of liquid. CO 2 It is cheap, non-toxic and environmentally friendly, and has a low critical temperature and is easy to operate. It has been widely used in various industries. [0003] Polymer foaming materials refer to materials that are based on polymers such as plastics, rubber, elastomers, or natural polymer materials, and are filled with tiny bubbles inside, usually using supercritical CO 2 Come foam. Foaming material is composed of plastic and gas. C...
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IPC IPC(8): G01N25/20
CPCG01N25/20
Inventor 徐丽郑娜浦群胡激江朱利平
Owner ZHEJIANG UNIV