CN214529355U - Novel polylactic acid fiber - Google Patents
Novel polylactic acid fiber Download PDFInfo
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- CN214529355U CN214529355U CN202120525262.5U CN202120525262U CN214529355U CN 214529355 U CN214529355 U CN 214529355U CN 202120525262 U CN202120525262 U CN 202120525262U CN 214529355 U CN214529355 U CN 214529355U
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Abstract
The utility model provides a novel polylactic acid fibre is formed with special skin-core structure complex by three kinds of raw materials, include: the core layer is arranged inside the skin layer and comprises a supporting part and a filling part; 2) drying the three raw materials in the step 1) in a vacuum state; 3) acetylating the raw materials acetic anhydride and pyridine which are dried in the step 2); 4) filtering impurities from the melted raw materials; 5) metering the raw materials obtained in the step 4); 6) the spinneret plate discharges filaments and cools the filament bundle; 7) winding and collecting the cooled tows; 8) and stretching and rolling. The invention has the advantages that: simple structure compounds through the polylactic acid raw materials of different characteristics, has formed new polylactic acid fibrous structure, has good travelling comfort, and the wearability is good, has improved the toughness and the intensity of product, and long service life is little to the temperature sensitivity, and difficult hydrolysis hardens, low in manufacturing cost easily uses widely, the sexual valence relative altitude.
Description
Technical Field
The utility model relates to a polylactic acid fibre production field, in particular to novel polylactic acid fibre.
Background
Polylactic acid (PLA) is a new biodegradable material made using starch feedstocks proposed by renewable plant resources such as corn. The starch raw material is saccharified to obtain glucose, the glucose and certain strains are fermented to prepare high-purity lactic acid, and then the polylactic acid with certain molecular weight is synthesized by a chemical synthesis method. The biodegradable plastic has good biodegradability, can be completely degraded by microorganisms in the nature after being used, finally generates carbon dioxide and water, does not pollute the environment, is very favorable for protecting the environment, and is a well-known environment-friendly material. The common polyester product is still burnt and cremated to cause a great deal of greenhouse gas to be discharged into the air, while the polylactic acid product is buried in the soil to be degraded, and the generated carbon dioxide directly enters the organic matter of the soil or is absorbed by plants, so that the carbon dioxide is not discharged into the air and does not cause the greenhouse effect. However, the common polylactic acid material contains a large amount of carboxyl, and has poor hydrolysis resistance and high temperature resistance, and the indexes of the product, such as physical strength and the like, are obviously reduced in high-temperature and high-humidity environments, so that the application of the polylactic acid material in the fiber field is influenced (fiber products generally need to be dyed in high-temperature water), and in order to make the polylactic acid material more suitable for fiber manufacturing, modification treatment is needed, so that the polylactic acid fiber with high temperature resistance, hydrolysis resistance and high strength is prepared.
SUMMERY OF THE UTILITY MODEL
The utility model provides a novel polylactic acid fibre, its simple structure, fibre heat resistance is good, low in manufacturing cost, convenient popularization.
In order to achieve the above object, the utility model adopts the following technical scheme:
a novel polylactic acid fiber is formed by compounding three raw materials in a special skin-core structure, and comprises: the skin, the inside of skin be equipped with the sandwich layer, the sandwich layer contain supporting part and filling portion two parts.
As an improvement, the section of the supporting part of the core layer is Y-shaped, and the supporting part is made of high-strength toughened modified polylactic acid, so that the supporting and stretching-resistant effects similar to a bracket are achieved, and the integral toughness and strength of the fiber can be improved.
As an improvement, the filling part of the core layer is common polylactic acid, so that the overall price of the fiber can be reduced, and the popularization is facilitated.
As an improvement, the skin layer is high-temperature-resistant hydrolysis-resistant modified polylactic acid, so that the fibers are prevented from being hydrolyzed and hardened during high-temperature dyeing.
A preparation method of novel polylactic acid fiber comprises the following specific steps:
1) the novel polylactic acid fiber consists of a core layer supporting part, a filling part and a skin layer, the skin layer is made of a high-temperature hydrolysis-resistant modified polylactic acid slice (raw material A), and the preparation method comprises the following steps: adding the polylactic acid slices, an epoxy end-capping reagent, a plasticizer, a chain extender and an antioxidant into a mixer in proportion, uniformly mixing, adding into a drying tower, controlling the temperature of the drying tower at 50-100 ℃ and the air pressure at 0.1-0.15Mpa, drying for 6-8 hours, then feeding into a screw, controlling the temperature of the screw at 70-210 ℃, and carrying out extrusion granulation to prepare high-temperature hydrolysis-resistant modified polylactic acid slices; the core layer supporting part is made of high-strength toughened modified polylactic acid slices (raw material B), and the preparation method comprises the following steps: adding the polylactic acid slices and the polyhydroxyalkanoate slices into a mixer in proportion, uniformly mixing, adding into a drying tower, controlling the temperature of the drying tower at 50-100 ℃, controlling the air pressure at 0.1-0.15Mpa, drying for 6-8 hours, then feeding into a screw, controlling the temperature of the screw at 70-210 ℃, and carrying out extrusion granulation to prepare the high-strength toughened modified polylactic acid slices; the filling part of the core layer is a polylactic acid slice (raw material C) with the molecular weight of more than 10 ten thousand and the melting point of 150-160 ℃. The three raw materials comprise, by weight, 40-60 parts of a raw material A, 10-30 parts of a raw material B and 20-40 parts of a raw material C.
2) Drying the three raw materials in the step 1) in a high vacuum state to ensure that the water content in the raw materials is less than 5 x 10-5ppm, drying temperature 80-120 deg.C;
3) acetylating the dried raw material obtained in the step 2) by using acetic anhydride and pyridine at the temperature of 40-55 ℃, putting the acylated raw material into a screw heating zone for hot melting, wherein the temperature is not more than 190 ℃, and the screw heating zone is divided into four zones in sequence;
4) filtering impurities from the melted raw materials through a filter, wherein the filter is provided with a heat tracing device, and the heating temperature of the heat tracing device is controlled at 140-170 ℃;
5) adding the raw materials obtained in the step 4) into a metering device for metering, uniformly adding the raw materials into a spinning device, and spinning through a spinneret plate;
6) the spinneret plate discharges filaments and the filaments are cooled by a segmented air cooling device which automatically controls the air volume and the air temperature, the air cooling device adopts an up-down multi-segment layout, the temperature of the air blowing device is controlled at 45-15 ℃, and the temperature of the air cooling device is sequentially decreased by 10 ℃ according to the temperature of sequential air blowing;
7) winding and collecting the cooled tows;
8) and stretching and rolling.
The utility model has the advantages that:
the utility model discloses the polylactic acid fiber simple structure of preparation compounds through the polylactic acid raw materials of different characteristics, has formed new polylactic acid fiber structure, has good travelling comfort, and the wearability is good, has improved the toughness and the intensity of product, and long service life is little to temperature sensitivity, is difficult for the sclerosis of hydrolysising, low in manufacturing cost, easily uses widely, the sexual valence relative altitude.
Drawings
Fig. 1 is a schematic structural view of the present invention;
reference symbol comparison table:
1-skin layer, 2-core layer filling part and 3-core layer supporting part.
Detailed Description
The following describes the present invention with reference to the accompanying drawings. In which like parts are designated by like reference numerals.
In order to make the content of the present invention more clearly understood, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the attached drawings in the embodiment of the present invention.
As shown in fig. 1, a novel polylactic acid fiber is formed by compounding three raw materials in a special skin-core structure, and comprises: the skin 1, the inside of skin 1 be equipped with the sandwich layer, the sandwich layer contain supporting part 3 and filling part 2 two parts.
The cross section of the core layer supporting part 3 is Y-shaped and is prepared from high-strength toughened and modified polylactic acid.
The core layer filling part 2 is made of common polylactic acid.
The skin layer 1 is high-temperature-resistant hydrolysis-resistant modified polylactic acid.
A preparation method of novel polylactic acid fiber comprises the following specific steps:
1) the novel polylactic acid fiber consists of a core layer supporting part (3), a filling part (2) and a skin layer (1), the skin layer (1) is made of high-temperature and hydrolysis-resistant modified polylactic acid slices (raw material A), and the preparation method comprises the following steps: adding the polylactic acid slices, an epoxy end-capping reagent, a plasticizer, a chain extender and an antioxidant into a mixer in proportion, uniformly mixing, adding into a drying tower, controlling the temperature of the drying tower at 50-100 ℃ and the air pressure at 0.1-0.15Mpa, drying for 6-8 hours, then feeding into a screw, controlling the temperature of the screw at 70-210 ℃, and carrying out extrusion granulation to prepare high-temperature hydrolysis-resistant modified polylactic acid slices; the core layer supporting part (3) is made of high-strength toughened modified polylactic acid slices (raw material B), and the preparation method comprises the following steps: adding the polylactic acid slices and the polyhydroxyalkanoate slices into a mixer in proportion, uniformly mixing, adding into a drying tower, controlling the temperature of the drying tower at 50-100 ℃, controlling the air pressure at 0.1-0.15Mpa, drying for 6-8 hours, then feeding into a screw, controlling the temperature of the screw at 70-210 ℃, and carrying out extrusion granulation to prepare the high-strength toughened modified polylactic acid slices; the core layer filling part (2) is a polylactic acid slice (raw material C) with the molecular weight of more than 10 ten thousand and the melting point of 150-160 ℃. The three raw materials comprise, by weight, 40-60 parts of a raw material A, 10-30 parts of a raw material B and 20-40 parts of a raw material C.
2) Drying the three raw materials in the step 1) in a high vacuum state to ensure that the water content in the raw materials is less than 5 x 10-5ppm, drying temperature 80-120 deg.C;
3) acetylating the dried raw material obtained in the step 2) by using acetic anhydride and pyridine at the temperature of 40-55 ℃, putting the acylated raw material into a screw heating zone for hot melting, wherein the temperature is not more than 190 ℃, and the screw heating zone is divided into four zones in sequence;
4) filtering impurities from the melted raw materials through a filter, wherein the filter is provided with a heat tracing device, and the heating temperature of the heat tracing device is controlled at 140-170 ℃;
5) adding the raw materials obtained in the step 4) into a metering device for metering, uniformly adding the raw materials into a spinning device, and spinning through a spinneret plate;
6) the spinneret plate discharges filaments and the filaments are cooled by a segmented air cooling device which automatically controls the air volume and the air temperature, the air cooling device adopts an up-down multi-segment layout, the temperature of the air blowing device is controlled at 45-15 ℃, and the temperature of the air cooling device is sequentially decreased by 10 ℃ according to the temperature of sequential air blowing;
7) winding and collecting the cooled tows;
8) and stretching and rolling.
Example one
Example two
EXAMPLE III
Example four
EXAMPLE five
The implementation effect is as follows:
the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention, and all modifications, equivalents, improvements and the like that are made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. A novel polylactic acid fiber is characterized in that the novel polylactic acid fiber is compounded by three raw materials in a special skin-core structure, and comprises: cortex (1), the inside of cortex (1) be equipped with the sandwich layer, the sandwich layer contain supporting part (3) and filling part (2) two parts.
2. The novel polylactic acid fiber according to claim 1, wherein: the section of the core layer supporting part (3) is Y-shaped and is prepared from high-strength toughened and modified polylactic acid.
3. The novel polylactic acid fiber according to claim 1, wherein: the core layer filling part (2) is made of common polylactic acid.
4. The novel polylactic acid fiber according to claim 1, wherein: the skin layer (1) is high-temperature-resistant hydrolysis-resistant modified polylactic acid.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120525262.5U CN214529355U (en) | 2021-03-12 | 2021-03-12 | Novel polylactic acid fiber |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120525262.5U CN214529355U (en) | 2021-03-12 | 2021-03-12 | Novel polylactic acid fiber |
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| CN214529355U true CN214529355U (en) | 2021-10-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112877809A (en) * | 2021-03-12 | 2021-06-01 | 苏州龙杰特种纤维股份有限公司 | Novel polylactic acid fiber and preparation method thereof |
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- 2021-03-12 CN CN202120525262.5U patent/CN214529355U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112877809A (en) * | 2021-03-12 | 2021-06-01 | 苏州龙杰特种纤维股份有限公司 | Novel polylactic acid fiber and preparation method thereof |
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