CN112111856A - Preparation method of polylactic acid paper hot-rolled cloth - Google Patents
Preparation method of polylactic acid paper hot-rolled cloth Download PDFInfo
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- CN112111856A CN112111856A CN202010905493.9A CN202010905493A CN112111856A CN 112111856 A CN112111856 A CN 112111856A CN 202010905493 A CN202010905493 A CN 202010905493A CN 112111856 A CN112111856 A CN 112111856A
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- polylactic acid
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- rolled cloth
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- polymerization
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
- D04H1/541—Composite fibres, e.g. sheath-core, sea-island or side-by-side; Mixed fibres
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/14—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyester as constituent
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/18—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from other substances
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Polyesters Or Polycarbonates (AREA)
- Artificial Filaments (AREA)
- Biological Depolymerization Polymers (AREA)
Abstract
The invention discloses a preparation method of polylactic acid paper hot-rolled cloth, which comprises the following steps: the method comprises the following steps: firstly, slicing the low molecular weight polylactic resin obtained by a direct polymerization method, and carrying out the slicing under the conditions of high vacuum and polymerization temperature lower than the melting point of a polymer and higher than the glass transition temperature of the polymer so as to improve the polymerization degree and increase the molecular weight; step two: then melt polycondensation is carried out to obtain PDLA and PLLA with lower molecular weight, the polylactic acid with the two configurations is melt blended in equal proportion to form a stereo complex, and finally the temperature of the stereo complex in the molten state is reduced to carry out solid-phase polymerization. The invention improves the polymerization degree and increases the molecular weight by slicing the low molecular weight polylactic resin obtained by the direct polymerization method under the conditions of high vacuum and the polymerization temperature lower than the melting point of the polymer and higher than the glass transition temperature of the polymer, and the fiber prepared by the polylactic acid obtained by the method has higher strength and better processing performance.
Description
Technical Field
The invention relates to the technical field of polylactic acid hot-rolled paper cloth, in particular to a preparation method of polylactic acid hot-rolled paper cloth.
Background
A considerable part of food packaging bags and food steamer paper widely used in the market adopts plastic or paper as a material. Paper products are used as raw materials to process food packaging bags, steamer paper and the like, and are relatively small or not harmful to the environment and human bodies, but the paper products are high in energy consumption in the production process and serious in environmental pollution, and even various measures for reducing the pollution are taken, the paper products still belong to the serious pollution industry. Articles made of plastics can cause increasingly serious environmental pollution if they cannot be recycled or degraded in a green manner under natural conditions.
Patent No. CN201911388580.5 discloses a method for preparing polylactic acid paper hot-rolled cloth, the preparation method comprises the steps of feeding, rough opening, cotton mixing, secondary fine opening, carding, lapping, drafting and hot rolling, the invention fully mixes the double-component polylactic acid fiber and the single-component polylactic acid fiber, and then the paper hot-rolled cloth with smooth surface is manufactured by smooth rolling at reasonable temperature, the manufactured polylactic acid paper hot-rolled cloth does not contain plasticizer and adhesive, plasticizer migration is avoided, the mechanical strength is higher, the manufactured 40-60 g/m2 polylactic acid hot-rolled cloth has transverse strength of 97-171N and longitudinal strength of 108-, meanwhile, the food is safe in contact and strong in high-temperature resistance, can be used as a food packaging material for packaging greasy and high-temperature foods, is green and degradable, has no pollution to the environment, and meets the requirements of national green development policies.
However, in the production process of the existing polylactic acid paper hot-rolled cloth, the strength and the processing performance of the manufactured hot-rolled cloth are not very good, and the heat resistance is not very high.
Disclosure of Invention
The invention aims to provide a preparation method of polylactic acid paper hot-rolled cloth, which solves the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a preparation method of polylactic acid paper hot-rolled cloth comprises the following steps:
the method comprises the following steps: firstly, slicing the low molecular weight polylactic resin obtained by a direct polymerization method, and carrying out the slicing under the conditions of high vacuum and polymerization temperature lower than the melting point of a polymer and higher than the glass transition temperature of the polymer so as to improve the polymerization degree and increase the molecular weight;
step two: then melt polycondensation to form PDLA and PLLA with lower molecular weight, then melt blending the polylactic acid with the two configurations in equal proportion to form a stereo complex, finally, cooling the stereo complex in a molten state to carry out solid phase polymerization reaction, and extending the chain of the amorphous polylactic acid to the racemic polylactic acid with the regular block with high molecular weight;
step three: mixing the materials obtained in the first step and the second step with carbon fiber yarns by using mixing equipment;
step four: and finally, feeding the mixture, coarsely opening, mixing cotton, secondarily finely opening, carding, lapping, drafting and hot-rolling to form hot-rolled cloth.
As a preferred embodiment of the invention, the carbon fiber yarn in the fourth step can be one or more of 1K, 3K, 6K, 12K, 24K and 48K in specification.
As a preferred embodiment of the present invention, the polylactic acid resin in the first step may be one or more of levorotatory polylactic acid, dextrorotatory polylactic acid, endo-polylactic acid and exo-polylactic acid.
As a preferred embodiment of the present invention, the mixing device in step three may be one or more of a mechanical mixing device, an air flow mixing device and a batch mixing device.
As a preferred embodiment of the present invention, the cotton mixing in the fourth step may adopt one or more of a large-bin cotton mixer, a multi-bin cotton mixer, an automatic cotton mixer and a five-roller cotton mixer.
As a preferred embodiment of the invention, the carding in the fourth step can adopt one or more of a rotary cover plate type carding machine and a roller type carding machine.
Compared with the prior art, the invention has the following beneficial effects:
the polylactic acid resin with low molecular weight obtained by a direct polymerization method is sliced under the conditions of high vacuum and polymerization temperature lower than the melting point of a polymer and higher than the glass transition temperature of the polymer to improve the polymerization degree and increase the molecular weight, the fiber prepared by the polylactic acid obtained by the method has higher strength and better processing performance, the PLLA and the PDLA have good crystallization characteristics, and the melting points of the two homopolymers are about 180 ℃. The stereo composite formed by the PLLA and the PDLA has a melting point of 230 ℃ which is improved by about 50 ℃, the structure effectively improves the heat resistance of the polylactic acid, can directly influence the production and the processing, and the tensile strength of the hot rolled cloth can be greatly improved by adding the carbon fiber yarns and mixing the carbon fiber yarns with the two materials.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a process flow chart of a method for preparing polylactic acid paper hot-rolled cloth.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Referring to fig. 1, the present invention provides a technical solution: a preparation method of polylactic acid paper hot-rolled cloth comprises the following steps:
the method comprises the following steps: firstly, slicing the low molecular weight polylactic resin obtained by a direct polymerization method, and carrying out the slicing under the conditions of high vacuum and polymerization temperature lower than the melting point of a polymer and higher than the glass transition temperature of the polymer so as to improve the polymerization degree and increase the molecular weight;
step two: then melt polycondensation is carried out to obtain PDLA and PLLA with lower molecular weight, the polylactic acid with the two configurations is melt blended in equal proportion to form a stereo complex, finally, the stereo complex in the molten state is cooled to carry out solid phase polymerization reaction, and the chain of the amorphous polylactic acid is extended to be the regular block racemic polylactic acid with high molecular weight
Step three: mixing the materials obtained in the first step and the second step with carbon fiber yarns by using mixing equipment;
step four: and finally, feeding the mixture, coarsely opening, mixing cotton, secondarily finely opening, carding, lapping, drafting and hot-rolling to form hot-rolled cloth.
Further, the carbon fiber yarn in the fourth step can be one or more of 1K, 3K, 6K, 12K, 24K and 48K in specification.
Further, the polylactic acid resin in the first step may be one or more of levorotatory polylactic acid, dextrorotatory polylactic acid, endo-polylactic acid and exo-polylactic acid.
Further, the mixing device in the third step may be one or more of a mechanical mixing device, an air flow mixing device and a batch mixing device.
Further, the cotton mixing in the fourth step can adopt one or more of a large-bin cotton mixing machine, a multi-bin cotton mixing machine, an automatic cotton mixing machine and a five-roller cotton mixing machine.
Furthermore, the carding in the fourth step can adopt one or more of a rotary cover plate type carding machine and a roller type carding machine.
Example one
A preparation method of polylactic acid paper hot-rolled cloth comprises the following steps:
the method comprises the following steps: firstly, slicing the low molecular weight polylactic resin obtained by a direct polymerization method, and carrying out the slicing under the conditions of high vacuum and polymerization temperature lower than the melting point of a polymer and higher than the glass transition temperature of the polymer so as to improve the polymerization degree and increase the molecular weight;
step two: then melt polycondensation is carried out to obtain PDLA and PLLA with lower molecular weight, the polylactic acid with the two configurations is melt blended in equal proportion to form a stereo complex, finally, the stereo complex in the molten state is cooled to carry out solid phase polymerization reaction, and the chain of the amorphous polylactic acid is extended to be the regular block racemic polylactic acid with high molecular weight
Step three: mixing the materials obtained in the first step and the second step with carbon fiber yarns by using mixing equipment;
step four: and finally, feeding the mixture, coarsely opening, mixing cotton, secondarily finely opening, carding, lapping, drafting and hot-rolling to form hot-rolled cloth.
The data parameters of the preparation method of the traditional polylactic acid paper hot rolled cloth are as follows:
| test items | Strength of hot rolled cloth | Processability (M-Y-Y | Tensile properties |
| Parameter index | In | Is low in | In general |
Example a preparation method of polylactic acid paper hot rolled cloth the data parameter table 2 is as follows:
| test items | Strength of hot rolled cloth | Olive fruit preparation efficiency | Tensile properties |
| Parameter index | Height of | Height of | Superior food |
In summary, referring to the data comparison in table 1 and table 2, the present invention improves the polymerization degree and increases the molecular weight by slicing the low molecular weight polylactic acid resin obtained by direct polymerization under the conditions of high vacuum and polymerization temperature lower than the melting point of the polymer and higher than the glass transition temperature of the polymer, the fiber prepared by polylactic acid obtained by the method has higher strength and better processing performance, PLLA and PDLA have good crystallization characteristics, and the melting points of both homopolymers are about 180 ℃. The stereo composite formed by the PLLA and the PDLA has a melting point of 230 ℃ which is improved by about 50 ℃, the structure effectively improves the heat resistance of the polylactic acid, can directly influence the production and the processing, and the tensile strength of the hot rolled cloth can be greatly improved by adding the carbon fiber yarns and mixing the carbon fiber yarns with the two materials.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. A preparation method of polylactic acid paper hot-rolled cloth is characterized by comprising the following steps:
the method comprises the following steps: firstly, slicing the low molecular weight polylactic resin obtained by a direct polymerization method, and carrying out the slicing under the conditions of high vacuum and polymerization temperature lower than the melting point of a polymer and higher than the glass transition temperature of the polymer so as to improve the polymerization degree and increase the molecular weight;
step two: then melt polycondensation to form PDLA and PLLA with lower molecular weight, then melt blending the polylactic acid with the two configurations in equal proportion to form a stereo complex, finally, cooling the stereo complex in a molten state to carry out solid phase polymerization reaction, and extending the chain of the amorphous polylactic acid to the racemic polylactic acid with the regular block with high molecular weight;
step three: mixing the materials obtained in the first step and the second step with carbon fiber yarns by using mixing equipment;
step four: and finally, feeding the mixture, coarsely opening, mixing cotton, secondarily finely opening, carding, lapping, drafting and hot-rolling to form hot-rolled cloth.
2. The method for preparing the polylactic acid paper hot-rolled cloth according to claim 1, which is characterized in that: the carbon fiber yarn in the fourth step can be one or more of 1K, 3K, 6K, 12K, 24K and 48K in specification.
3. The method for preparing the polylactic acid paper hot-rolled cloth according to claim 1, which is characterized in that: the polylactic acid resin in the first step can be one or more of levorotatory polylactic acid, dextrorotatory polylactic acid, internal rotatory polylactic acid and external rotatory polylactic acid.
4. The method for preparing the polylactic acid paper hot-rolled cloth according to claim 1, which is characterized in that: the mixing equipment in the third step can be one or more of mechanical mixing equipment, airflow mixing equipment and batch mixing equipment.
5. The method for preparing the polylactic acid paper hot-rolled cloth according to claim 1, which is characterized in that: the cotton mixing in the fourth step can adopt one or more of a large-bin cotton mixing machine, a multi-bin cotton mixing machine, an automatic cotton mixing machine and a five-roller cotton mixing machine.
6. The method for preparing the polylactic acid paper hot-rolled cloth according to claim 1, which is characterized in that: the carding in the fourth step can adopt one or more of a rotary cover plate type carding machine and a roller type carding machine. .
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| CN202010905493.9A CN112111856A (en) | 2020-09-01 | 2020-09-01 | Preparation method of polylactic acid paper hot-rolled cloth |
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Citations (7)
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|---|---|---|---|---|
| CN103031667A (en) * | 2012-12-27 | 2013-04-10 | 杭州可靠护理用品股份有限公司 | Fully degradable non-woven material and application thereof to incontinence nursing pads for adults |
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| CN207207293U (en) * | 2017-07-21 | 2018-04-10 | 吉林大学 | Carbon fiber reinforced polymer-based composite board |
| CN110616505A (en) * | 2019-10-15 | 2019-12-27 | 南通醋酸纤维有限公司 | Composite acetate fiber non-woven material for cigarette filter tip, preparation method and application |
| CN110747578A (en) * | 2019-10-25 | 2020-02-04 | 江苏天鸟高新技术股份有限公司 | High-density carbon fiber needled felt and preparation method thereof |
| CN110983617A (en) * | 2019-12-30 | 2020-04-10 | 恒天长江生物材料有限公司 | Preparation method of polylactic acid paper hot-rolled cloth |
-
2020
- 2020-09-01 CN CN202010905493.9A patent/CN112111856A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN207207293U (en) * | 2017-07-21 | 2018-04-10 | 吉林大学 | Carbon fiber reinforced polymer-based composite board |
| CN110616505A (en) * | 2019-10-15 | 2019-12-27 | 南通醋酸纤维有限公司 | Composite acetate fiber non-woven material for cigarette filter tip, preparation method and application |
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