Preparation method of degradable straw raw material PLA (polylactic acid)

Abstract

The invention discloses a preparation method of a degradable straw raw material PLA (polylactic acid), which comprises the following steps: feeding: sequentially pouring raw materials to the surface of a raw material stacking plate, pressing the raw material stacking plate downwards by the weight of the raw materials, descending an oval sliding block and a shading baffle along with the raw material stacking plate, and stopping feeding when light emitted by a laser lamp penetrates through a light hole to be displayed; and overturning and material pouring: after all the raw materials are added, enabling the oval sliding block to move downwards into a circular through groove, rotating the raw material stacking plate and the oval sliding block at the same time, and pouring the raw materials on the surface of the raw material stacking plate into a feeding hopper. Raw materials and auxiliaries which need to be added are sequentially placed on the raw material stacking plate, the raw material stacking plate can be pressed downwards by the weight of the raw materials, so that an extrusion spring is compressed, the oval sliding block slides downwards along a sliding groove all the time, the oval sliding block is clamped in the sliding groove, a rotating shaft is limited and cannot rotate, and therefore, the raw material stacking plate cannot turn over.

Description

technical field [0001] The invention relates to the technical field of PLA polylactic acid material preparation, in particular to a preparation method of PLA polylactic acid, a raw material of degradable straws. Background technique [0002] Polylactic acid (PLA) is a biodegradable polyester material. Lactic acid, the raw material for the synthesis of polylactic acid, comes from natural crops such as corn. After the product is discarded, it can be degraded into water and carbon dioxide in the natural environment. Therefore, polylactic acid has biological Degradability, recyclability, in addition, it has good biocompatibility and excellent mechanical properties. However, polylactic acid also has the disadvantages of brittleness and low impact strength. Improving the toughness of polylactic acid can broaden the application field of polylactic acid. PLA is a new type of non-toxic and completely biodegradable polymer material. With the improvement of synthesis process, the expa...

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Problems solved by technology

[0004] The present invention provides a preparation method of PLA polylactic acid, a raw material of degradable straws, which can effectively solve the problem that the polylactic acid material proposed in the above-mentioned background technology cannot be directly weighed when the various raw materials added are weighed in advance before preparation. , the steps are complicated, which increases the workload of the staff, and it is easy to make mistakes in the ratio of raw materials, resulting in the problem that the prepared mixture cannot be used normally

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