KR101691018B1 - Paper yarn comprising nanocellulose fiber - Google Patents

Abstract

The present invention relates to a branch including nanocellulose fibers and a method of manufacturing the same, and more particularly, to a branch including 10 to 99% by weight of long fibers and 1 to 90% by weight of nanocellulose fibers . The branch according to the present invention is advantageous in that it can provide a high-quality branch since the thickness of the yarn is thinner than that of the conventional branch but its strength is large.

Description

[0001] The present invention relates to a paper yarn comprising nanocellulose fiber,

The present invention relates to a branch containing nanocellulose fibers.

In recent years, the demand for environmentally friendly and harmless clothing and household goods has been increasing due to the improvement of living standards and civilization, and the development of natural fibers and the enhancement of functionalities are attracting attention Among them, interest in paper yarn is increasing.

Paper yarn is a paper yarn, also called paper yarn. A low basis weight paper made of long fibers such as pine wood, mackerel, abaca, hemp fiber, and kenaf pine fiber is used as a raw material, and this is cut into a width of 2 to 5 mm and twisted appropriately. Because it feels similar to Amasia, it is used as a similar garment and is also used for fabrics, cushions, ornaments that make up a summer band. Cotton yarn is used as a ventricle, and some paper is woven around it. In some cases, waterproofing or resin processing is performed to impart water resistance to a fabric made by a branch, and cotton yarn is used in combination with cotton yarn or a silk thread. I also made. However, the technology for improving the function or usefulness of the paper yarn has not yet been achieved.

Until now, the raw materials of the branch have been made by using duck fiber, abaca, and wood pulp. However, since the strength of the raw paper is low and the thickness of the raw paper is low, the strength of the produced yarn is low, It is difficult to manufacture a variety of high quality yarns. One example of a technique for manufacturing such paper yarns is disclosed in Korean Patent No. 0705487, which has a branch material in which a functional material is embedded, and a manufacturing method thereof. In Korean Patent No. 0654155, A method for producing a branch by applying a twist to a paper tape cut by a width is disclosed.

However, up to now, in the production of the above-mentioned branch, the strength of the paper yarn is increased by mixing the nano-cellulose fibers with long fibers such as wood pulp, dodecafil or avacar to form paper yarn, And a production method thereof have not been reported.

SUMMARY OF THE INVENTION The present invention has been accomplished on the basis of the above-described needs, and it is an object of the present invention to provide a method for producing a polyolefin fiber, which comprises 90 to 99% by weight of long fibers and fibers having a width of 5 to 500 nm and a width to length ratio of 1: 1 to not less than 10% of nano-fibrillated cellulose (nanofibrillated cellulose) by weight of a fiber, and the tensile strength and the harmonic mean 32MPa or less, the heat refurbished aspect ratio 7.0, a density of 0.8g / cm ³ The present invention relates to a branch fabric prepared from a branch fabric, characterized by analyzing the physical properties using the branch fabric, and comparing the tensile strength or heat shrinkage, elongation percentage and intrinsic strength at the same basis weight as that of the branch without the nanocellulose fiber And a paper having a very low thickness is produced, and a branch having a high strength and a high strength is produced, thereby completing the present invention.

In order to attain the above object, the present invention provides a nonwoven fabric comprising 90 to 99% by weight of long fibers and fibers having a width of 5 to 500 nm and a width to length ratio of 1: 2 to 200, Characterized in that it comprises a nanofibrillated cellulose fiber and has a tensile strength harmonic average of 32 MPa or less, an aspect ratio of longitudinal heat of 7.0 or more, and a density of 0.8 g / cm ³ or less. to provide.

The present invention relates to a branch including nanocellulose fibers. More specifically, the present invention is characterized in that the width of long fibers and fibers of 90 to 99% by weight is 5 to 500 nm, and the ratio of width to length is 1: 2 to 200 1 to not less than 10% of nano-fibrillated cellulose (nanofibrillated cellulose) by weight of a fiber, and the tensile strength and the harmonic mean 32MPa or less, the heat refurbished aspect ratio 7.0, a density of 0.8g / cm ³ The branch office being made from a branch office paper. Since the branch according to the present invention has high strength and thinness, it can not only produce a high quality branch but also can be suitably used as an environmentally friendly material since natural materials are used.

1 is a scanning electron micrograph of a branch prepared in Examples and Comparative Examples of the present invention, wherein (A) is a photograph of a branch paper containing 90% of abaca and 10% of nanocellulose (Example 2) (B) is a photograph of a branch paper product (Comparative Example 1) of J Company, which is made of 100% Abakar.
Fig. 2 is a view showing the basis weight (g / m ² ) of the examples and comparative examples of the present invention.
Fig. 3 is a diagram showing the heat front length Km for the embodiment of the present invention and the comparative example.
4 is a graph showing elongation percentage (%) for Examples and Comparative Examples of the present invention.
FIG. 5 is a diagram showing the internal strengths of Examples and Comparative Examples of the present invention. FIG.
Figs. 3 to 5 (A) show the column length Km of the machine direction (MD), and Fig. 5 (B) shows the column length Km of the cross direction (CD). The thermal head length is a unit for comparing the tensile strength under the same basis weight.

The present invention relates to a nanofibrillated cellulose fiber comprising 1 to 10% by weight of a long fiber and a fiber having a width of 5 to 500 nm and a width to length ratio of 1: 2 to 200, cellulose fibers having an average tensile strength harmonic of 32 MPa or less, an aspect ratio of 7.0 or more and a density of 0.8 g / cm ³ The branch office being made from a branch office paper.

The term " branch " in the present invention refers to a paper yarn, but it encompasses a branch paper used as a raw material of a paper yarn. The nanocellulose fiber used as an auxiliary raw material in the branch of the present invention is a fiber obtained by physically and chemically separating wood pulp And the width on the shorter side is 500 nm or less on average. More preferably, the nanocellulose fibers have a width of 5 to 500 nm and a width to length ratio of 1: 2 to 200. Therefore, there is a strong characteristic of bonding between fibers, and a preferable example of the nanocellulose fiber may be nanofibrillated cellulose, but is not limited thereto.

The long fiber is preferably a fiber having a length of at least 3 mm, more preferably an average fiber having a length of 3 to 20 mm, and is preferably at least one selected from duck fiber, abaca, hemp, and cannaf. When two or more of the long fibers are mixed, the mixing ratio can be adjusted as needed.

The duck fiber and the abaca are long fibers having a length of about 8 mm and a width of about 20 탆.

In addition, the wood pulp may further contain wood pulp or auxiliary fiber in addition to the long fiber and the nanocellulose fiber, and the length of the wood pulp is 1 to 5 mm and the width is 20 to 50 탆.

When the wood pulp is further included, the price of the wood pulp is low, so that the unit cost can be lowered.

As the auxiliary fibers, any of the fibers used in the textile industry can be freely used. Preferred examples of the auxiliary fibers include non-wood pulp, regenerated fibers such as rayon and acetate, nylon, polyester, acryl, Polyethylene, polystyrene, polyvinyl chloride, polypropylene, and polyurethane. It is also possible to use blended fibers or blended fibers comprising two or more kinds of fibers having different properties.

When the nano-cellulose has a high fiber-to-fiber bond strength, the strength of the paper base paper is increased and the density thereof is increased, so that a thin paper base paper can be produced. When the thickness of the paper base paper is decreased, the diameter of the paper yarn formed by twisting the paper base paper is shortened It is possible to manufacture a high-grade branch having high slenderness and high strength. Therefore, by using the nanocellulose fibers, it is possible to manufacture a thin and strong branch.

The branch of the present invention is characterized in that the strength of the branch is increased and the diameter is narrowed.

The method for producing the branch (paper chamber) of the present invention can be appropriately selected from conventional known methods, and a preferable example of the method for producing the branch

1) preparing 5 to 30 g / m < ² > of a base paper using 10 to 99% by weight of long fiber and 1 to 90% by weight of nanocellulose fiber;

2) cutting the base fabric prepared in the step 1) to a width of 1 to 5 mm; And

3) a step of twisting the ground paper cut by itself or adding the auxiliary yarn in the step 2) to produce a twist yarn.

In the method according to one embodiment of the present invention, the long fibers and the nanocellulose fibers are as described above.

In the step 1), furthermore, the paper raw paper can be manufactured by further including wood pulp, and in the step 3), the auxiliary yarn can be used freely in any fiber used in the textile industry in general, It may be a regenerated fiber yarn such as rayon and acetate or a synthetic fiber yarn selected from among nylon, polyester, acrylic, polyethylene, polystyrene, polyvinyl chloride, polypropylene and polyurethane, Branches can be manufactured by twisting. Further, it is also possible to use blended fibers or mixed fibers obtained by mixing two or more kinds of fibers having different properties, or they may be used by mixing two or more of the auxiliary yarns together.

Hereinafter, the present invention will be described in more detail with reference to Examples. It is to be understood by those skilled in the art that these embodiments are merely illustrative of the present invention and that the scope of the present invention is not limited thereto.

Example 1

A branch yarn containing 95% of abaca and 5% of nanocellulose fibers was prepared. An image of a scanning electron microscope of the ground fabric prepared in Example 1 is shown in Fig. 1 (A). When the electron micrograph of Comparative Example 1 was compared with that of FIG. 1 (B), the branch of the present invention was found to have a high density because the bonds between the fibers were very large and the bonds between the fibers were large.

Example 2.

Branches containing 90% of abaca and 10% of nanocellulose fibers were prepared.

Comparative Example 1

J branch products made of 100% long fiber containing no nanocellulose fibers were selected.

Comparative Example 2

A branch company of Company D, which is made of 100% long fiber, which does not contain nanocellulose fibers, was selected.

Comparative Example  3

A branch made only of 100% of Abacarone without nanocellulose fibers was prepared.

Experimental Example 1. Analysis of Physical and Optical Properties of Branches Containing Nanocellulose Fibers According to the Present Invention

The physical and optical properties of the branch containing nanocellulose fibers according to the present invention were analyzed. Physical and optical properties were measured after 24 hours of pretreatment in a constant temperature and humidity chamber controlled at 23 ± 1 ° C and 50 ± 2% relative humidity according to the TAPPI standard T402 om-88 of the American Society of Paper Pulp Technology. The humidity-treated specimens were weighed (g / m ² ), density (g / cm ³ ), heat shrinkage (Km), elongation percentage (%) based on the TAPPI standard of the American Society of Pulp and Paper Technology om-88) and frequency (TAPPI T 423 om-89).

The basis weight is to mean the weight of the branch base paper for a certain area, the meter basis weight shown on the weight of the branches of 1m ² sheet area in g.

Density refers to the weight per unit volume, which is specified in KSM 7021 (test method for thickness and density of paper and paperboard). Generally, when the density is increased, the general intellectual strength is increased up to a certain point. There is a problem with the head and the internal strength.

The breaking length (Km) is a criterion for determining the scale of tensile strength. When the paper is pulled down from high to low, the length (Km) when cut by the load of the paper is called the heat shrinkage. This test method is specified in KSM 7014 (Tensile strength test method of paper) and can be a unit for comparing tensile strength at the same basis weight.

The stretch (%) is the original length minus the length of the stretched length, divided by the original length multiplied by 100.

Elongation percentage (%) = [(elongated length - original length) / original length] x 100

The folding endurance (Frequency) is the strength expressed in the number of diffraction times from the folding line to the breaking point, alternately reversing folding test pieces of a predetermined size under a certain condition and relating to the toughness (brittleness) of the paper have. That is, paper used as a folded paper or a cover is a sensitive measure of paper aging which shows its performance and decreases in fiber strength.

The physical and optical properties of the paper containing the nanocellulose fibers are shown in Table 1 and Figures 2 to 5.

Physical and optical properties of paper containing nano-cellulose fibers
Kinds
Basis weight
(g _f / m ² )
density
(g / cm ³⁾
Heat gauge
(Km) Elongation rate
(%) My Zhejiang Province
(Frequency) MD CD MD CD MD CD Example 1 14.85 0.73 9.15 1.02 3.12 1.52 11 One Example 2 15.35 0.76 11.82 1.57 3.87 1.72 21 5 Comparative Example 1 15.11 0.59 7.10 0.48 2.31 0.97 8 0 Comparative Example 2 14.22 0.52 7.28 0.62 2.80 1.03 10 0 Comparative Example 3 15.00 0.43 7.13 0.52 2.21 1.10 7 0

The tensile strength / basis weight (S / g) and the tensile strength (S) are expressed in F / w (force / sample width in kilo newtons (kN) / m) And the unit is (kN / m) / (gf / m ² ) = (10 ³ N / m) / (9.81 10 ^-3 N / m ² ) = 10 ⁶ m / 9.81 = 10 ³ km / 9.81. Therefore, the column length is (1 / 9.81) x S / g x 10 ³ km (the same as the column length formula of ISO 1924-1).

As shown in Table 1, the heat-shrinkage, elongation, and intrinsic strength of the base paper (Examples 1 and 2) containing the nanocellulose fibers according to the present invention were compared with those of the base paper without the nanocellulose fibers (Comparative Examples 1 to 3 ).

The thicknesses, the average roughness average of heat shots, the average of tensile strength harmonics and the aspect ratio of heat ends of the prior art (Prior Art No. 2012-087431) and the first and second embodiments of the present invention were compared.

The thickness, the heat shrinkage average, the tensile strength harmonic mean, and the heat shrinkage aspect ratio were calculated and shown in Table 2 using the basis weight, density, and heat shrinkage length of Examples 1 and 2 shown in Table 1 and the following formulas 1 to 4.

Equation 1. Thickness = Basis / Density

Formula 2. Columns refurbished conditioning (heat Director of the Company (MD) × thermal refurbished hoengmok (CD) of) mean = ^2.1

Calculation formula 3. Tensile strength (Kg _f / m)

Equation 4. Tensile Strength Harmonization Average = (Tensile Strength x 9.8) / Thickness

The thickness of the base paper including the nanocellulose fibers, the average of the heat shrinkage harmonics, the average of the tensile strength harmonics and the heat shrinkage aspect ratio Basis weight density thickness Heat Gun, MD Heat Gun, CD Heat gauge
Harmony
Average The tensile strength
Harmonic mean Heat gauge
Aspect ratio g / m ² g / cm ³ m (x 10 ^-6 ) Km Km Km MPa MD / CD example
invent Example 1 14.85 0.73 20.34 9.15 1.02 3.05 21.85 8.97 Example 2 15.35 0.76 20.20 11.82 1.57 4.31 32.08 7.53
preceding
Technology
Example 1 15.00 1.07 14.92 8.77 2.86 5.01 52.52 3.07 Example 2 15.00 1.18 12.71 8.99 2.94 5.14 59.45 3.06 Example 4 15.00 1.27 11.81 19.85 5.70 10.64 132.39 3.48 Comparative Example 3 15.00 1.22 12.30 11.88 3.93 6.86 81.66 3.02

As disclosed in Table 2, which is below the branch source of the present invention tensile strength of the harmonic mean 32MPa, heat is dressed with an aspect ratio of more than 7.0 and a density of 0.8g / cm ³ On the other hand, characterized in that not more than, the prior art governor and the average circle that the tensile strength of the blend (Japanese Patent Application Laid-Open No. 2012-087431) This over 52MPa, heat refurbished aspect ratio is 3.02 ~ 3.48, the density was 1.07g / cm ³ , It is confirmed that the physical and optical properties of the paper of the present invention are remarkably different from those of the paper of the present invention.

Claims (6)

1 to 10% by weight of nanofibrillated cellulose fibers having a width of 90 to 99% by weight of long fibers and fibers of 5 to 500 nm and a width to length ratio of 1: 2 to 200 and including, the tensile strength of the harmonic mean is less than or equal to 32MPa, heat dressed with an aspect ratio of more than 7.0 to a density of 0.8g / cm ³ Or less. ≪ RTI ID = 0.0 > 8. < / RTI > 2. The branch fabric as claimed in claim 1, wherein the long fibers have an average fiber length of 3 to 20 mm. The branch according to claim 2, wherein the long fibers are at least one selected from the group consisting of duckfibre, abaca, hemp, and cannabis. The branch according to claim 1, further comprising wood pulp or auxiliary fibers in addition to said long fiber and nanofibrillated cellulose fiber. The branch according to claim 4, wherein the auxiliary fibers are at least one selected from non-wood pulp, regenerated fiber, synthetic fiber, blend fiber and mixed fiber. The method according to claim 5, wherein the regenerated fiber is rayon or acetate, and the synthetic fiber is at least one selected from nylon, polyester, acrylic, polyethylene, polystyrene, polyvinyl chloride, polypropylene and polyurethane Manufactured branch office.

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