Preparation method of degradable polylactic acid fiber
A technology of polylactic acid fiber and polylactic acid, which is applied in the field of preparation of degradable polylactic acid fiber, can solve the problem that the stability of atomic structure in polylactic acid fiber is easily affected by external factors, and achieve enhanced stability and improved work efficiency Effect
Inactive Publication Date: 2019-12-31
安徽桑尼旅游休闲用品有限公司
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Problems solved by technology
[0004] In the traditional preparation process of polylactic acid fiber, it is necessary to extrude the polymer and then place it in a container for melting operation. If the temperature is in a relatively stable range, the stability of the atomic structure in the prepared polylactic acid fiber will be easily affected by external factors.
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0026] A preparation method of degradable polylactic acid fiber, comprising the following steps:
[0027] (1) Vacuum processing: polylactic acid polymers are used as raw materials, and the raw materials are put into a vacuum container for drying treatment. The pressure in the vacuum container is 2.0×10 -3 Pa-3.0×10 -3 Pa, and the vacuum treatment time is 2-3h;
[0028] (2) Negative pressure treatment: the vacuum container is connected to the outside world through a heating pipe, so that the melted polylactic acid polymer can be extruded from the vacuum container, and the pressure in the vacuum container is controlled to be 1.0 higher than the normal air pressure. ×10 2 Pa-2.0×10 2 Pa, the melting process is carried out simultaneously in this step (2), to ensure that the temperature of the heating pipe is the same as the temperature during the melting process, and the temperature is controlled between 200-300°C; there are several groups of heating pipes arranged above, and t...
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Abstract
The invention discloses a preparation method of degradable polylactic acid fiber, including the steps such as processing in vacuum, to be specific, drying raw materials, namely polylactic acid polymers, in a vacuum container. With gradient heating, polylactic acid fiber is processed by a way of cooling first and heating later, stability of internal atomic structure of the polylactic acid fiber canbe strengthened further, and meanwhile, the polylactic acid fiber keeps dry relatively in an environment with relatively high temperature. Besides, with negative-pressure processing, the polylactic acid polymers are squeezed from the container automatically according to the principle of pressure difference, while fusing is carried out during the squeezing, the conventional process of squeezing the polymers first and then putting them into the container to perform the fusing work is omitted, and thus, the work efficiency in preparation of the polylactic acid polymers is improved.
Description
technical field [0001] The invention relates to the field of polylactic acid fibers, in particular to a preparation method of degradable polylactic acid fibers. Background technique [0002] Polylactic acid fiber is a completely biodegradable synthetic fiber, which can be obtained from grains. After its products are discarded, they can be decomposed into carbon dioxide and water by microorganisms in soil or seawater. When burning, they will not emit poisonous gas and will not It is a sustainable ecological fiber that causes pollution. [0003] Polylactic acid (PLA) in polylactic acid fiber is a polyhydroxy acid. Lactic acid, a carbohydrate produced by Lactobacillus, is a naturally occurring compound commonly found in living organisms, including the human body. Polylactic acid with high molecular weight can be obtained by chemical polymerization of cyclic dimer of lactic acid or direct polymerization of lactic acid. Products obtained from polylactic acid have good biocompa...
Claims
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IPC IPC(8): D01D13/00D01D5/16D01D4/02D01D11/00B29B13/06
CPCB29B13/065D01D4/02D01D5/16D01D11/00D01D13/00D10B2331/04
Inventor 应永阳
Owner 安徽桑尼旅游休闲用品有限公司