CN111253654A

CN111253654A - Plant-derived PE master batch and preparation method and application thereof

Info

Publication number: CN111253654A
Application number: CN201911134715.5A
Authority: CN
Inventors: 黄效华; 刘彦明; 甄丽; 刘洁; 黄效谦
Original assignee: Zhongke Textile Research Institute Qingdao Co ltd
Current assignee: Zhongke Textile Research Institute Qingdao Co ltd
Priority date: 2018-11-30
Filing date: 2019-11-19
Publication date: 2020-06-09

Abstract

The invention discloses a plant-derived PE master batch, a preparation method and application thereof. And blending, melting and granulating the PE matrix and the plant extract to obtain the plant-derived PE master batch, adding anti-carbonization agents chitin and starch into plant extract powder in order to prevent the plant extract from seriously carbonizing and losing in a high-temperature process, and banburying in an internal mixer for modification. The plant-derived PE master batch is safe and nontoxic, has natural appearance color and luster, uniform particle size, is applied to fibers, film products or engineering plastics, is green and environment-friendly, has the functions of natural fragrance, bacteriostasis and the like, improves the moisture regain of the fibers, and reduces the mechanical strength.

Description

Plant-derived PE master batch and preparation method and application thereof

Technical Field

The invention relates to the technical field of high polymer materials, and particularly relates to a plant-derived PE master batch, and a preparation method and application thereof.

Background

Polyethylene, abbreviated as PE, is a thermoplastic resin obtained by polymerizing ethylene. Most of the plastic bags commonly used by people are made of PE materials, the price is moderate, and the comprehensive performance of the product is excellent. The PE fiber is an important variety in synthetic fiber, has stable chemical property and good chemical resistance and corrosion resistance.

CN105002584A is an aromatic polypropylene fiber, the fiber level PP slice and the pre-treated nanometer essence, antioxidant, lubricant and dispersant are melt blended and extruded to produce aromatic polypropylene mother particle, the aromatic polypropylene mother particle and the fiber level PP slice are melt spun to produce aromatic polypropylene mother particle, the pre-treated nanometer essence is hydroxypropyl- β -cyclodextrin solution is used in the fluidized bed to coat the nanometer essence, the fabric made of the aromatic fiber has very good washing fastness and still has fragrance after 50 times of washing, and CN101144200A discloses a polyethylene fiber with lasting antibacterial and deodorizing effects, in the melt spinning process of polyethylene, the additive containing 0.5-2.0% of α -zirconium phosphate and inorganic silver ion is added by a quantitative frequency conversion injection device to spin together, the prepared polyethylene fiber has the antibacterial, deodorizing and health care effects, and the functions are not weakened with the increase of washing times.

In the prior art, the fragrance of PE products is improved by adding essence or essential oil, inorganic antibacterial agents such as metal ions with antibacterial activity, such as silver, copper, zinc, iron and the like, organic antibacterial agents such as quaternary ammonium salts, imidazoles, pyridines, organic metals and the like, and natural antibacterial agents such as components extracted from animals, plants or organisms are added to improve the antibacterial performance. The effective components extracted from the plants have wide sources, low cost, safety, no toxicity and more purposes, so the effective components are valued by people. Zhao Yan celery, bamboo leaf antibacterial regenerated cellulose fiber preparation and performance research [ J ] knitting industry, 2017 (8): 27-29, adding a lophatherum gracile extract aqueous solution into a viscose spinning solution to prepare a blending spinning solution, and preparing the antibacterial regenerated cellulose fiber from the lophatherum gracile according to the production process of the common viscose fiber, wherein the morphological structure of the antibacterial regenerated cellulose fiber is similar to that of the common pure viscose fiber, the breaking strength of the antibacterial regenerated cellulose fiber is slightly greater than that of the common pure viscose fiber, the elongation at break of the antibacterial regenerated cellulose fiber is not greatly different from that of the common pure viscose fiber, but the hygroscopicity of the antibacterial regenerated cellulose fiber is enhanced, and the antibacterial rate of the antibacterial regenerated cellulose fiber to staphylococcus aureus reaches. At present, the addition of the plant extract is mostly applied to wet spinning, but certain limitation is caused on melt spinning, mainly because the plant extract is easy to carbonize in the high-temperature melting process, the loss of active ingredients is serious, and the plant extract cannot play the role.

Based on the method, the plant extract is added with the anti-carbonization additives of chitin and starch, and is banburied by a mixer, the plant extract is modified, and is blended, melted and granulated with a PE matrix to prepare the plant-derived PE master batch. The plant source PE master batch and the PE matrix are melted to prepare fiber, film or plastic, and the efficacy of the plant extract can be exerted.

Disclosure of Invention

The invention provides a plant source PE master batch, and the plant source refers to various plants from nature.

The modified plant extract of the invention is a composition formed by adding anti-carbonization agents chitin and starch into plant extract powder.

Further, the modified plant extract of the present invention refers to a composition prepared by mixing 40-55 parts of plant extract powder, 20-30 parts of chitin and 4-10 parts of starch.

Furthermore, the modified plant extract of the invention is only a mixture obtained by mixing 40-55 parts of plant extract powder, 20-30 parts of chitin and 4-10 parts of starch, adding 70-90 parts of deionized water, adjusting the pH value to 7-8, heating to 50-65 ℃ and mixing uniformly; shaking the obtained mixture evenly, distilling under reduced pressure, dissolving in 40-60 parts of deionized water, continuously filtering through a semipermeable membrane, and adding 15-25 parts of acrylic acid; and (3) banburying the filtered mixture in the membrane in an internal mixer, naturally airing, grinding and sieving to obtain the modified plant extract.

The parts in the invention are parts by weight unless otherwise specified.

The plant source PE master batch is mainly prepared by blending, melting and granulating a PE matrix and a modified plant extract, wherein the addition amount of the modified plant extract is 1-20 wt%.

Preferably, the modified plant extract is added in an amount of 13-20 wt%.

The modified plant extract is prepared by adding anti-carbonization agent chitin and starch into plant extract powder and then banburying the mixture by a mixer.

The modified plant extract is one or more of herba Leonuri, folium Artemisiae Argyi, herba Apocyni Veneti, folium Isatidis and herba Menthae.

The preparation method of the plant-derived PE master batch comprises the following steps:

(1) preparation of modified herbal extracts

A1. Mixing 40-55 parts of plant powder, 20-30 parts of chitin and 4-10 parts of starch, adding 70-90 parts of deionized water, adjusting the pH to 7-8, heating to 50-65 ℃, and uniformly mixing to obtain a mixture;

A2. shaking the mixture obtained from A1 uniformly, distilling under reduced pressure, dissolving in 40-60 parts of deionized water, continuously filtering through a semipermeable membrane, and adding 15-25 parts of acrylic acid;

A3. and (3) banburying the intramembrane mixture filtered by the A2 in an internal mixer, naturally airing, grinding and sieving to obtain the modified plant extract.

(2) Preparation of plant-derived PE master batch

B1. Adding 1-3 wt% of reaction auxiliary agent into the modified plant extract and fully mixing;

B2. melting a PE matrix, stirring, adding a modified plant extract containing a reaction auxiliary agent, a dispersing agent and a crosslinking agent, continuously stirring, and carrying out a crosslinking reaction to obtain a product, wherein the addition amount of the dispersing agent is 1.5-6.5 wt% of the PE matrix, and the addition amount of the crosslinking agent is 0.1-1 wt% of the modified plant extract containing the reaction auxiliary agent;

B3. and (3) putting the product into a double-screw extruder, melting, extruding, cooling, and granulating by a granulator to obtain the plant source PE master batch.

The addition of the modified plant extract causes the viscosity of the masterbatch to decrease, and thus acrylic acid is added to increase the viscosity.

Preferably, in the step A3, the banburying time is 2-4 hours. After banburying, the modified plant extract with larger particle size can be dispersed.

Preferably, in step B1, the reaction assistant is prepared from the following raw materials in parts by weight: 1-3 parts of 3, 4-dimethyl-3, 4-diphenylhexane, 1-4 parts of surface hardening and wear-resisting agent T8011-4 parts, 2-5 parts of adipic acid dihydrazide, 2-7 parts of epoxy chloropropane, 2-3 parts of defoaming agent BYK0251, 3-7 parts of polycarbodiimide and 2-6 parts of zinc hydroxide. The addition of the reaction auxiliary agent helps to improve the reaction progress.

Preferably, in the step B2, the dispersant comprises, by mass, 1-3 parts of single-walled carbon nanotubes, 5-7 parts of trimeric fatty acid, 1-3 parts of palladium-tin modified nano titanium dioxide, 4-6 parts of isopropanolamine, 0-2 parts of magnesium hydroxy silicate and 4-6 parts of polyethylene oxide. After the dispersing agent is added, the modified plant extract is dispersed more uniformly, which is beneficial to the exertion of the plant efficacy.

The plant-derived PE master batch can be used for preparing PE fibers through spinning. The method comprises the following specific steps:

(1) melting: setting the temperature of the melting extruder to 165-175 ℃, metering the plant-derived PE master batch and the PE matrix by a metering pump after the temperature is stable, and continuously heating until the mixture is completely melted, wherein the screw pressure during melting is 75-85kg/cm, and the screw rotating speed is 32-35 rad/min;

(2) and (3) cooling: cooling by adopting cross-blown air, wherein the temperature of the cross-blown air is 25-32 ℃, the rheumatism degree is 55%, and the air speed is 0.3-0.5 m/s;

(3) winding: cooling, oiling, bundling and winding, wherein the spinning speed is 800-;

(4) drafting: the drafting multiple is 2.5-3.2 times, the drafting temperature is 80-105 ℃, and the PE fiber is obtained.

The PE film or PE plastic can also be prepared by conventional methods. The PE fiber, the PE film or the PE plastic comprise a PE matrix and the plant source PE master batch, and the addition amount of the modified plant extract is 0.1-1 wt%.

The invention adds the anti-charring additives of chitin and starch, can form certain complex crosslinking with macromolecular chains in the PE matrix, coats and fixes the plant extract with the interior and the surface of the master batch and the fiber, and prevents the charring of the plant extract and the loss of the plant extract in the using and washing processes. Meanwhile, the chitin also has the synergistic antibacterial effect. In the banburying process, small molecules and water in the plant extract are reduced, and the efficacy of the plant is improved.

The invention has the beneficial effects that:

(1) the plant-derived PE master batch has good uniformity and is not easy to be connected.

(2) The dispersing agent can uniformly disperse the modified plant extract in the PE matrix, and the plant-derived PE master batch has good spinnability, is not easy to break and wind a roller when used for preparing fibers and is not easy to break when used for preparing PE films or plastics.

(3) Compared with common products, the plant-derived PE master batch and the PE product prepared from the plant-derived PE master batch have the advantages of less reduction of physical and mechanical properties, fragrance, antibiosis, antiphlogosis and the like, and the added value of the product is improved. Meanwhile, the plant extract contains polysaccharide, flavone, hydrophilic group hydroxyl, acyl and the like, so that the moisture regain can be increased and the comfort is enhanced when the plant extract is added into the fiber.

(4) The method for modifying the plant extract has universality and is suitable for most plants.

Detailed Description

Preparation of plant-derived PE master batch

The plant extract powder is commercially available, and 100% of the plant extract powder is required to pass through a 10000-mesh sieve, so that the plant extract powder is loose, has no agglomeration, has uniform and consistent color and no bad smell, and the total number of colonies is less than 99 cfu/g.

EXAMPLE 1 preparation of mint PE masterbatch

Weighing 40 parts of mint extract powder, 20 parts of chitin and 4 parts of starch, uniformly mixing, adding 70 parts of deionized water, adjusting the pH value to 7 by using sodium carbonate, heating to 50 ℃, and uniformly mixing; shaking the mixture evenly, distilling under reduced pressure, dissolving in 40 parts of deionized water, continuously washing and filtering by a semipermeable membrane, and adding 15 parts of acrylic acid into the mixture in the membrane; then banburying in an internal mixer for 3h, naturally drying, grinding, and sieving to obtain modified herba Menthae extract with good compatibility and mesh number of 10000 mesh.

Weighing 200 parts of the modified mint extract and 6 parts of a reaction auxiliary agent, uniformly mixing, weighing 751 part of PE matrix, melting, adding the modified mint extract containing the reaction auxiliary agent, 49 parts of a dispersing agent and 2 parts of a cross-linking agent, stirring, and carrying out a cross-linking reaction to obtain a cross-linked product; and (3) putting the mixture into a double-screw extruder, melting, extruding and cooling the mixture, and then granulating the mixture by a granulator to prepare the mint PE master batch.

EXAMPLE 2 preparation of mugwort PE masterbatch

Weighing 45 parts of wormwood extract powder, 30 parts of chitin and 8 parts of starch, uniformly mixing, adding 75 parts of deionized water, adjusting the pH value to 8 by using sodium bicarbonate, heating to 60 ℃, and uniformly mixing; shaking the mixture evenly, distilling under reduced pressure, dissolving in 45 parts of deionized water, continuously filtering through a semipermeable membrane, and adding 25 parts of acrylic acid into the mixture in the membrane; then banburying in an internal mixer for 3h, naturally drying, grinding, and sieving to obtain modified folium Artemisiae Argyi extract with good compatibility and mesh number of 10000 mesh.

Weighing 180 parts of the modified wormwood extract and 3.6 parts of a reaction auxiliary agent, uniformly mixing, weighing 804 parts of PE matrix, melting, adding the modified motherwort extract containing the reaction auxiliary agent, 16 parts of a dispersing agent and 2 parts of a cross-linking agent, stirring, and carrying out cross-linking reaction to obtain a cross-linked product; and (3) putting the mixture into a double-screw extruder, melting, extruding and cooling the mixture, and then granulating the mixture by a granulator to prepare the wormwood PE master batch.

Example 3 preparation of Apocynum venetum PE masterbatch

Weighing 55 parts of apocynum venetum extract powder, 30 parts of chitin and 10 parts of starch, uniformly mixing, adding 90 parts of deionized water, adjusting the pH value to 8 by using sodium bicarbonate, heating to 55 ℃, and uniformly mixing; shaking the mixture evenly, distilling under reduced pressure, dissolving in 60 parts of deionized water, continuously filtering through a semipermeable membrane, and adding 25 parts of acrylic acid into the mixture in the membrane; then placing the mixture into an internal mixer for internal mixing for 2 hours, naturally airing, grinding and sieving to obtain the modified apocynum venetum extract with good compatibility and the mesh number of 10000 meshes.

Weighing 150 parts of the modified apocynum venetum extract and 4.5 parts of a reaction auxiliary agent, uniformly mixing, weighing 817 parts of PE matrix, melting, adding the modified apocynum venetum extract containing the reaction auxiliary agent, 33 parts of a dispersing agent and 1.54 parts of a cross-linking agent, stirring, and carrying out a cross-linking reaction to obtain a cross-linked product; and (3) putting the mixture into a double-screw extruder, melting, extruding and cooling the mixture, and then granulating the mixture by a granulator to prepare the apocynum venetum PE master batch.

Example 4 preparation of folium Isatidis PE masterbatch

Weighing 47 parts of folium isatidis extract powder, 25 parts of chitin and 7 parts of starch, uniformly mixing, adding 80 parts of deionized water, adjusting the pH value to 7.6 by using sodium carbonate, heating to 58 ℃, and uniformly mixing; shaking the mixture evenly, distilling under reduced pressure, dissolving in 50 parts of deionized water, continuously filtering through a semipermeable membrane, and adding 20 parts of acrylic acid into the mixture in the membrane; then placing the mixture into an internal mixer for internal mixing for 2.5h, naturally airing, grinding and sieving to obtain the modified folium isatidis extract with good compatibility and the mesh number of 10000 meshes.

Weighing 130 parts of modified folium isatidis extract and 2.4 parts of reaction auxiliary agent, uniformly mixing, weighing 857 parts of PE matrix, melting, adding the modified folium isatidis extract containing the reaction auxiliary agent, 13 parts of dispersing agent and 0.6 part of cross-linking agent, stirring, and carrying out cross-linking reaction to obtain a cross-linked product; and (3) putting the mixture into a double-screw extruder, melting, extruding and cooling the mixture, and then granulating the mixture by a granulator to prepare the folium isatidis PE master batch.

EXAMPLE 5 preparation of motherwort PE masterbatch

Weighing 45 parts of motherwort extract powder, 28 parts of chitin and 7 parts of starch, uniformly mixing, adding 85 parts of deionized water, adjusting the pH to 8 by using sodium carbonate, heating to 65 ℃, and uniformly mixing; shaking the mixture evenly, distilling under reduced pressure, dissolving in 60 parts of deionized water, continuously filtering through a semipermeable membrane, and adding 20 parts of acrylic acid into the mixture in the membrane; then banburying in a banbury mixer for 4 days, naturally drying, grinding, and sieving to obtain modified herba Leonuri extract with good compatibility and mesh number of 10000 meshes.

Weighing 10 parts of the modified motherwort extract and 0.25 part of a reaction auxiliary agent, uniformly mixing, weighing 930 parts of a PE matrix, melting, adding the modified motherwort extract containing the reaction auxiliary agent, 60 parts of a dispersing agent and 0.05 part of a cross-linking agent, stirring, and carrying out a cross-linking reaction to obtain a cross-linked product; and (3) putting the mixture into a double-screw extruder, melting, extruding and cooling the mixture, and then granulating the mixture by a granulator to prepare the motherwort PE master batch.

EXAMPLE 6 preparation of a blended PE masterbatch of motherwort and wormwood

Weighing 49 parts of mixed powder of motherwort and wormwood extracts, 27 parts of chitin and 8 parts of starch, uniformly mixing, adding 70 parts of deionized water, adjusting the pH value to 7.8 by using sodium carbonate, heating to 50 ℃, and uniformly mixing; shaking the mixture evenly, distilling under reduced pressure, dissolving in 48 parts of deionized water, and continuously filtering through a semipermeable membrane, wherein 16 parts of acrylic acid is added into the mixture in the membrane; then banburying in a banbury mixer for 4h, naturally drying, grinding, and sieving to obtain the modified motherwort and wormwood mixed extract.

Weighing 110 parts of the mixed extract of the modified motherwort and the wormwood, and 2.7 parts of a reaction auxiliary agent, uniformly mixing, weighing 836 parts of a PE matrix, melting, adding the mixed extract of the modified motherwort and the wormwood containing the reaction auxiliary agent, 54 parts of a dispersing agent and 0.6 part of a cross-linking agent, stirring, and carrying out a cross-linking reaction to obtain a cross-linked product; and putting the mixture into a double-screw extruder, melting, extruding and cooling the mixture, and granulating the mixture by a granulator to prepare the motherwort and wormwood mixed PE master batch.

Example 7 preparation of blended PE masterbatch of Apocynum venetum and Mentha haplocalyx

Weighing 54 parts of apocynum venetum and mint extract mixed powder, 24 parts of chitin and 8 parts of starch, uniformly mixing, adding 77 parts of deionized water, adjusting the pH value to 7.6 by using sodium carbonate, heating to 56 ℃, and uniformly mixing; shaking the mixture evenly, distilling under reduced pressure, dissolving in 46 parts of deionized water, and continuously filtering through a semipermeable membrane to obtain a mixture in the membrane, wherein 23 parts of acrylic acid is added into the mixture; then placing the mixture into an internal mixer for internal mixing for 3.5h, naturally airing, grinding and sieving to obtain the modified apocynum venetum and mint mixed extract.

Weighing 100 parts of the modified apocynum venetum and mint mixed extract and 2.8 parts of a reaction auxiliary agent, uniformly mixing, weighing 857 parts of PE matrix, melting, adding the modified apocynum venetum and mint mixed extract containing the reaction auxiliary agent, 43 parts of a dispersing agent and 0.2 part of a cross-linking agent, stirring, and carrying out cross-linking reaction to obtain a cross-linked product; and (3) putting the mixture into a double-screw extruder, melting, extruding and cooling the mixture, and then granulating the mixture by a granulator to prepare the apocynum venetum and mint mixed PE master batch.

EXAMPLE 8 preparation of a blended PE masterbatch of motherwort, indigowoad leaf and mint

Weighing 50 parts of the modified mint, folium isatidis and herba leonuri extracts prepared in the embodiments 1, 4 and 5, and 1.25 parts of reaction auxiliary agent, uniformly mixing, weighing 896 parts of PE matrix, melting, adding the modified herba leonuri, folium isatidis and mint mixed extract containing the reaction auxiliary agent, 54 parts of dispersing agent and 0.4 part of cross-linking agent, stirring, and carrying out cross-linking reaction to obtain a cross-linked product; and putting the mixture into a double-screw extruder, melting, extruding and cooling the mixture, and granulating the mixture by a granulator to prepare the mixed PE master batch of the leonurus, the indigowoad leaf and the mint.

Example 9 preparation of blended PE Master batches for mint, mugwort, Apocynum venetum and Isatis indigotica leaf

Weighing 140 parts of the mixed extract of the modified mint, the wormwood, the apocynum venetum and the folium isatidis prepared in the embodiment 1-4, mixing the mixed extract with 3.9 parts of a reaction auxiliary agent, weighing 818 parts of PE matrix, melting, adding the mixed extract of the modified mint, the wormwood, the apocynum venetum and the folium isatidis containing the reaction auxiliary agent, 42 parts of a dispersing agent and 0.7 part of a cross-linking agent, stirring, and carrying out cross-linking reaction to obtain a cross-linked product; and putting the mixture into a double-screw extruder, melting, extruding and cooling the mixture, and granulating the mixture by a granulator to prepare the mixed PE master batch of the mint, the wormwood, the apocynum venetum and the folium isatidis.

Preparation of PE fiber

And (3) spinning the PE master batches through melting, cooling, winding and drafting processes to prepare a fiber product with the thickness of 1.5dtex 65 mm. The selection and the amount of the master batch are shown in Table 1. After the PE matrix and the plant source PE master batch are blended, a PE film or PE plastic can also be prepared, which is not listed.

TABLE 1 preparation of PE fibers (1.5dtex 65mm)

Third, comparative example

The PE masterbatch of comparative example 1 was prepared by direct granulation of the PE matrix without the addition of plant extracts. Comparative example 2 is peppermint PE masterbatch prepared according to example 1, but without the addition of chitin and starch. Comparative example 3 is the mint PE masterbatch prepared according to example 1, but without banburying in an internal mixer, dried and then air dried naturally, milled and sieved. Comparative example 4 is a mint PE masterbatch prepared according to example 1, but without the addition of a dispersant. The master batches of comparative examples 1 to 4 are weighed according to the parts of the raw materials in the table 2, and are spun to prepare the fiber.

TABLE 2

Fourth, example of experiment

The content of the modified plant extract in the plant-derived PE master batch is screened, when the content of the modified plant extract in the master batch exceeds 20 wt%, the surface of the master batch is not smooth and has scraps, and the scraps are increased along with the increase of the content of the modified plant extract, so that the subsequent processing is influenced. It can be seen that the more modified plant extract content is not the better. However, when the content of the modified plant extract in the master batch is lower than 1%, the antibacterial performance of the prepared fiber and other products is almost the same as that of the products without the modified plant extract, and the antibacterial performance is not improved. Therefore, the content of the modified plant extract in the master batch adopted by the invention is 1-20 wt%.

In the present invention, the content of the modified plant extract in the fiber and other products prepared from the plant-derived PE master batch was selected as shown in table 3. Experimental example 1 and Experimental example 2 were prepared as in example 14, except that the ratio of the PE matrix to the plant-derived PE masterbatch was changed.

TABLE 3

The antibacterial performance and the moisture regain of the experimental examples 1-2 are not different from those of the comparative example 5, and it can be seen that when the content of the modified plant extract is less than 0.1 wt%, the performance of the plant-derived PE master batch product cannot be improved well, and the antibacterial performance and the moisture regain of the fiber are improved with the increase of the content of the modified plant extract, but the more the content of the modified plant extract is, the better the antibacterial performance is, and when the content exceeds 1 wt%, the plant extract is not easy to disperse, particles are formed on the surface of the fiber, and the fiber is rough and not soft. Therefore, the content of the modified plant extract in the fiber, the film or the plastic products prepared by the plant source PE master batch is 0.1-1 wt%.

Fifth, performance test

1. Appearance and smell

The PE master batch of comparative example 1 has uniform particles, regular shape, smooth surface and no plant fragrance. The plant-derived PE master batch particles of examples 1 to 9 have a smooth surface, regular properties, a particle size uniformity of 93.2 to 96.8%, no continuous particles, no crumbs, and a fragrant odor of plants. Compared with the plant-derived PE master batches of examples 1 to 9, the master batches of comparative examples 2 to 4 have a light smell, non-round granules and chipped surfaces.

After the plant-derived PE master batch is placed for three months, the PE master batch is found to still emit special plant odor when the content of the modified plant extract in the PE master batch exceeds 13 percent. When the content of the modified plant extract in the PE master batch is less than 13%, the smell becomes light. Therefore, the content of the modified plant extract in the master batch may preferably be 13 to 20%.

The PE fiber of comparative example 5 was odorless as it contained no plant extract. The PE fibers prepared in examples 10-18 had an aromatic odor, were refreshing, had no surface debris, and had no difference in appearance from the fibers of comparative example 5, but were richer in gloss. The fibers of comparative examples 6 to 8 had a light smell and a grainy feel on the surface, and particularly the fibers of comparative example 8 had distinct black spots on the surface, probably because the plant extracts were agglomerated and poorly dispersed. Therefore, the plant extract can be more uniform by adding the dispersing agent, and meanwhile, if the charring prevention agents chitin and starch are not added, the plant extract is seriously charred in a high-temperature process, more active ingredients are lost, and scraps are left. The film or plastic prepared from the plant-derived PE master batch also has plant fragrance.

2. Spinning performance

The plant-derived PE master batches of the embodiments 1 to 9 have good spinnability and good drawability in the spinning process, the winding rate is as low as 0.00009 to 0.00015 percent, and the production process is stable. When the plant-derived PE master batch is used for preparing the film or the plastic, the stability is realized in the film preparation or injection molding process. However, comparative examples 2 to 3 formed crumbs during spinning due to charring of the plant extract during high temperature, and comparative example 4 also affected spinning due to poor dispersion of the plant extract without a dispersant.

3. Mechanical Properties

Some of the performance indicators for the PE fibers (1.5dtex 65mm) are shown in Table 4.

TABLE 4

The fiber of comparative example 5 was superior according to FZ/T52034-. The PE fibers of comparative examples 6 to 8 were severely degraded in mechanical properties. The fibers of examples 10 to 18 had a linear density deviation of. + -. 4.02 to 5.14%, a length deviation of. + -. 2.88 to 3.33% and a defect content of 4.0 to 5.5mg/100 g. Although the mechanical properties were inferior to those of comparative example 5, the PE fiber of the present invention was still superior and did not affect normal use. The mechanical properties of the PE film or plastic hardly change, and the addition of the modified plant extract does not affect the normal properties.

4. Research on antibacterial performance

The antibacterial rate of the PE fiber is detected according to an oscillation method in the antibacterial performance of the textile of GB/T20944.3-2008, the stability of the antibacterial effect is measured after the PE fiber is washed for 50 times, and the experimental result is shown in Table 5.

TABLE 5 antibacterial Properties of PE fibers

Comparative example 5 is PE fiber without plant extract, the bacteriostatic ratio for escherichia coli and staphylococcus aureus was 81.2% and 80.1%, respectively, and after washing 50 times, the bacteriostatic ratio decreased to 79.9% and 76.3%. Examples 10-18, prepared by adding PE fiber to the modified plant extract according to the present invention, had bacteriostatic rates for escherichia coli and staphylococcus aureus of 87.6% -98.9% and 88.6% -97.9%, and the bacteriostatic effect was better as the content of the plant extract increased. After 50 times of washing, the bacteriostasis rate is 86.3 to 95.2 percent and 85.9 to 93.5 percent. After repeated washing, the plant source PE fiber still has good antibacterial performance, which shows that after the plant extract is modified, the effective components can be slowly released, and the functionality can be exerted for a long time. On the contrary, if the plant extract is not modified, i.e. the anti-charring additives chitin and starch are not added and the banburying process is carried out, the plant components are lost. As comparative examples 6 and 7, the inhibition rates against E.coli and Staphylococcus aureus were only 83.5% -84.6% and 81.8% -82.7%, which are much lower than those of the PE fibers of examples 10-18. The bacteriostasis rates of the comparative example 8 to escherichia coli and staphylococcus aureus are only 84.2% and 83.0%, and the dispersibility of the modified plant extract is helpful for exerting the bacteriostasis function. Similarly, the PE film or PE plastic prepared from the plant-derived PE master batch also has natural antibacterial activity, does not need to add other chemical reagents or antibacterial metal ions, and is beneficial to human health.

5. Moisture regain

The PE fiber has similar moisture absorption capacity to polypropylene fiber, and the moisture regain is close to 0 under normal atmospheric conditions. The moisture regain is the amount of water in the textile material measured under specified conditions and is expressed as the difference between the mass of the sample before drying and the dried mass versus the percentage of the dried mass. The moisture regain was calculated by direct test oven method. The moisture regain of comparative examples 5 to 7 was almost all 0, and the moisture regain of comparative example 8 was slightly increased to 1.1%, and although the plant extract was agglomerated, the hydrophilic group in the plant was advantageous for increasing the moisture regain of the PE fiber. The moisture regain of the examples 10 to 18 can be increased to 2.9 to 5.6%.

While the present invention has been described in further detail with reference to specific embodiments thereof, it should be understood that the preferred embodiments described herein are merely illustrative and explanatory of the invention and are not restrictive thereof. Since plants are various, they are not listed here.

Claims

1. A plant source PE master batch is characterized in that: the plant source PE master batch is mainly prepared by blending, melting and granulating a PE matrix and a modified plant extract, wherein the addition amount of the modified plant extract is 1-20 wt%.

2. The plant-derived PE masterbatch according to claim 1, wherein: the modified plant extract is prepared by adding anti-charring agent chitin and starch into plant extract powder and banburying the mixture by a mixer.

3. The plant-derived PE masterbatch according to claim 1, wherein: the modified plant extract is one or more of herba Leonuri, folium Artemisiae Argyi, herba Apocyni Veneti, folium Isatidis or herba Menthae.

4. A method of preparing a modified plant extract as claimed in any one of claims 1 to 3, characterized in that: the method comprises the following steps:

5. The method for preparing a modified plant extract as claimed in claim 4, wherein: in the step A3, the banburying time is 2-4 hours.

6. A method for preparing the plant-derived PE masterbatch according to any one of claims 1 to 5, wherein the method comprises the following steps: the preparation method comprises the following steps:

7. The method for preparing the plant-derived PE masterbatch according to claim 6, wherein the method comprises the following steps: in the step B1, the reaction auxiliary agent is prepared from the following raw materials in parts by weight: 1-3 parts of 3, 4-dimethyl-3, 4-diphenylhexane, 1-4 parts of surface hardening and wear-resisting agent T8011-4 parts, 2-5 parts of adipic acid dihydrazide, 2-7 parts of epoxy chloropropane, 2-3 parts of defoaming agent BYK0251, 3-7 parts of polycarbodiimide and 2-6 parts of zinc hydroxide.

8. The method for preparing the plant-derived PE masterbatch according to claim 6, wherein the method comprises the following steps: in the step B2, the dispersant comprises, by mass, 1-3 parts of single-walled carbon nanotubes, 5-7 parts of trimeric fatty acid, 1-3 parts of palladium-tin modified nano titanium dioxide, 4-6 parts of isopropanolamine, 0.5-2 parts of magnesium hydroxy silicate and 4-6 parts of polyethylene oxide.

9. The plant-derived PE master batch as claimed in any one of claims 1 to 8, and the preparation method thereof, and the application of the plant-derived PE master batch in preparation of PE fibers, PE films or PE plastic products.

10. Use according to claim 9, characterized in that: the PE fiber, the PE film or the PE plastic product comprises a PE matrix and the plant source PE master batch, and the addition amount of the modified plant extract is 0.1-1 wt%.