CN114347518B - PLA straw crystallization process - Google Patents
PLA straw crystallization process Download PDFInfo
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- CN114347518B CN114347518B CN202111660546.6A CN202111660546A CN114347518B CN 114347518 B CN114347518 B CN 114347518B CN 202111660546 A CN202111660546 A CN 202111660546A CN 114347518 B CN114347518 B CN 114347518B
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Abstract
The invention provides a PLA straw crystallization process, which is characterized in that: the method comprises (1) vertically placing the formed suction tube in a hollow frame; (2) Superposing the frame with the suction pipe in the step (1); (3) And (3) pushing the frames stacked in the step (2) into a drying room to perform multistage baking. Through placing the suction pipe vertically closely at the frame of fretwork, then impel the baking house and carry out sectional type baking, can guarantee like this that the suction pipe can not warp at whole baking process, adopts the form of baking house in addition, and the heat can not lose, and the energy consumption is lower, and efficiency is higher.
Description
Technical Field
The invention relates to the field of straw manufacturing, in particular to a PLA straw crystallization process.
Background
The main component of the degradable plastic straw is polylactic acid (PLA), the PLA is derived from biology (corn starch), and the degradable plastic straw is a green high polymer material with few biology base and full biodegradation. PLA has very similar performance to polypropylene; as a straw, the straw has enough strength and hardness, good water resistance, good anti-meltability, natural antibacterial property, no toxicity and no smell; the main disadvantage is poor heat resistance. The Heat Distortion Temperature (HDT) of industrially produced PLA products is only around 58 ℃ limiting its use. The main methods for improving the heat resistance of PLA are as follows: copolymerization, blending, crosslinking, and improving crystallinity.
The existing crystallization technology in the market generally makes the formed straw put on a conveyer belt and baked while being conveyed, and adopts the form of the conveyer belt, so that an outlet and an inlet are needed, air circulation is realized, heat can be dissipated into the air, the environmental temperature rise and the energy consumption are large, and the PLA straw crystallization time is short, the PLA straw can not be fully crystallized, the temperature resistance is unstable, and the temperature resistance is low; meanwhile, the efficiency is lower; in addition, the amount of PBS in the formulation of the pipette in this way must be higher than 20% to 25%, and PBS is expensive, which increases the cost and the migration risk (the main components of migration are ethylene succinate and succinic acid and 2-ethylbut-3-en-1-yl ester, which are side reaction products of PBS).
In view of this, the present inventors have conducted intensive studies on the above problems, and have produced the present invention.
Disclosure of Invention
The invention aims to provide a PLA straw crystallization process, which solves the problems that the straw cannot be fully crystallized when the straw is crystallized in the prior art, so that the temperature resistance of the straw is low and the energy consumption is too high.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a PLA straw crystallization process comprising the steps of:
(1) Vertically placing the formed suction pipe in a hollowed frame;
(2) Superposing the frame with the suction pipe in the step (1);
(3) And (3) pushing the frames stacked in the step (2) into a drying room to perform multistage baking.
Further, in the step (1), the tips of the pipettes are directed upward, and the pipettes are closely arranged.
Further, baking the straw in three stages in step (3); the first section: baking at 55-65deg.C for 0.5-1 hr; and a second section: baking at constant temperature of 60-70 ℃ for 0.5-1h; third section: baking at 70-80deg.C for 1.5-2 hr.
Further, the first section: baking at 60 ℃ for 0.5-1h at constant temperature; and a second section: baking at 65 ℃ for 0.5-1h at constant temperature; third section: baking at 80 deg.C for 1.5-2 hr.
Further, the first section: baking at a constant temperature of 60 ℃ for 1h; and a second section: baking at 65 ℃ for 1h at constant temperature; third section: baking at 80 ℃ for 2h at constant temperature.
Furthermore, in the step (2), both the side face and the bottom face of the frame are round hollow.
After the technical scheme is adopted, the PLA straw crystallization process is characterized in that the straw is vertically and tightly placed on the hollowed frame and then pushed into the drying room to be baked in a sectional mode, so that the straw can be prevented from deforming in the whole baking process, and in addition, the straw is in a drying room mode, heat cannot be lost, energy consumption is low, and efficiency is high.
Drawings
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a schematic view showing the placement of a pipette according to the present invention.
In the figure: 1-frame and 2-straw.
Detailed Description
In order to further explain the technical scheme of the invention, the following is explained in detail through specific examples.
As shown in fig. 1-2, a PLA straw crystallization process includes the steps of:
(1) Vertically placing the formed suction pipe 2 in the hollowed frame 1;
(2) Superposing the frame 1 with the suction pipe 2 in the step (1);
(3) And (3) pushing the frames 1 stacked in the step (2) into a drying room to perform multistage baking.
Preferably, in step (1), the tips of the pipettes 2 are facing upwards and the pipettes 2 are closely spaced. The tip of the suction pipe 2 is upwards, so that the tip can be prevented from being damaged, the suction pipes 2 are tightly arranged, space can be saved, more suction pipes 2 are contained at one time, the efficiency is improved, and a drying room is adopted, so that labor can be saved.
Preferably, the pipette 2 is baked in three stages in step (3); the first section: baking at 55-65deg.C for 0.5-1 hr; and a second section: baking at constant temperature of 60-70 ℃ for 0.5-1h; third section: baking at 70-80deg.C for 1.5-2 hr. The baking house is custom-made equipment, and can control the temperature to rise in a fluctuation mode, and the baking is carried out by dividing the temperature into three stages, so that the suction pipe 2 can be prevented from deforming in the whole baking process. In addition, by adopting the scheme, the PBS content in the suction pipe 2 can be reduced to 5-10%, the cost is greatly saved, and the temperature resistance of the suction pipe 2 can reach 95-100 ℃.
Preferably, the first stage: baking at 60 ℃ for 0.5-1h at constant temperature; and a second section: baking at 65 ℃ for 0.5-1h at constant temperature; third section: baking at 80 deg.C for 1.5-2 hr.
Preferably, the first stage: baking at a constant temperature of 60 ℃ for 1h; and a second section: baking at 65 ℃ for 1h at constant temperature; third section: baking at 80 ℃ for 2h at constant temperature.
Preferably, in the step (2), both the side surface and the bottom surface of the frame 1 are round hollow. The frame 1 is in a hollowed-out mode, each suction pipe 2 can be heated fully, in addition, the frame 1 at the bottommost layer needs to be placed on a hollowed-out pallet, and the bottom of the frame 1 at the bottommost layer can be heated uniformly by adopting the hollowed-out pallet.
The form of the present invention is not limited to the illustrations and examples, and any person who performs a similar idea of the present invention should be regarded as not departing from the scope of the patent of the invention.
Claims (5)
1. A PLA straw crystallization process is characterized in that: the method comprises the following steps:
(1) Vertically placing the formed suction pipe in a hollowed frame;
(2) Superposing the frame with the suction pipe in the step (1);
(3) Pushing the frames overlapped in the step (2) into a drying room for multistage baking; baking the straw in three stages; the first section: baking at 55-65deg.C for 0.5-1 hr; and a second section: baking at constant temperature of 60-70 ℃ for 0.5-1h; third section: baking at 70-80deg.C for 1.5-2 hr.
2. A PLA straw crystallization process according to claim 1, wherein: in the step (1), the tips of the suction pipes face upwards, and the suction pipes are closely arranged.
3. A PLA straw crystallization process according to claim 1, wherein: the first section: baking at 60 ℃ for 0.5-1h at constant temperature; and a second section: baking at 65 ℃ for 0.5-1h at constant temperature; third section: baking at 80 deg.C for 1.5-2 hr.
4. A PLA straw crystallization process according to claim 3, wherein: the first section: baking at a constant temperature of 60 ℃ for 1h; and a second section: baking at 65 ℃ for 1h at constant temperature; third section: baking at 80 ℃ for 2h at constant temperature.
5. A PLA straw crystallization process according to claim 1, wherein: and (3) in the step (2), the side surface and the bottom surface of the frame are round hollow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111660546.6A CN114347518B (en) | 2021-12-31 | 2021-12-31 | PLA straw crystallization process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111660546.6A CN114347518B (en) | 2021-12-31 | 2021-12-31 | PLA straw crystallization process |
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| CN114347518A CN114347518A (en) | 2022-04-15 |
| CN114347518B true CN114347518B (en) | 2023-06-02 |
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