KR-20260064161-A - Masterbatch containing cellulose nanofibers, method for producing the same, and plastic composition containing the masterbatch

Abstract

The present invention relates to a masterbatch containing cellulose nanofibers, a method for manufacturing the same, and a plastic composition containing said masterbatch, wherein the masterbatch containing said cellulose nanofibers comprises 60 to 70 weight% of cellulose nanofibers (CNF), 20 weight% of a thermoplastic resin, and the remainder being water. The masterbatch containing cellulose nanofibers and the method for manufacturing the same according to the present invention are prepared using CNF in a water-dispersed state, so they not only contain uniform nano-sized CNFs but also can be easily applied to various plastic materials because they are prepared by dispersing them in a thermoplastic resin. Furthermore, the plastic composition to which the masterbatch containing cellulose nanofibers is applied contains CNF, a natural material, making it environmentally friendly while providing excellent mechanical properties.

Inventors

• 박병욱
• 윤진희
• 송현우
• 황경호

Assignees

• (주)우성케미칼

Dates

Publication Date

20260507

Application Date

20241031

Claims (6)

1. A masterbatch comprising 60 to 70 wt% cellulose nanofibers (CNF), 20 wt% thermoplastic resin, and the remainder being water.
2. In claim 1, A masterbatch comprising cellulose nanofibers characterized in that the above thermoplastic resin is a polyolefin elastomer
3. In claim 1, A masterbatch comprising cellulose nanofibers characterized in that the thermoplastic resin is a maleic acid-grafted polyolefin elastomer.
4. In claim 3, A masterbatch comprising cellulose nanofibers characterized in that the thermoplastic resin further comprises wax, and the maleic acid-grafted polyolefin elastomer and the wax are included in a weight ratio of 9:1 to 2.3:1.
5. A plastic composition comprising a masterbatch comprising cellulose nanofibers according to any one of claims 1 to 4.
6. A method for preparing a masterbatch comprising cellulose nanofibers according to claims 1 to 4, A step of mixing water-dispersed CNF and thermoplastic resin using a heated kneader, A method for producing a masterbatch containing cellulose nanofibers, characterized by including the step of passing the above CNF-thermoplastic resin mixture through a heated 3-roll mill.

Description

Masterbatch containing cellulose nanofibers, method for producing the same, and plastic composition containing the masterbatch The present invention relates to a masterbatch comprising cellulose nanofibers, a method for manufacturing the same, and a plastic composition comprising said masterbatch. Specifically, it relates to a cellulose nanofiber-thermoplastic resin composite masterbatch prepared by mixing and dispersing a cellulose nanofiber aqueous dispersion in a thermoplastic resin and then drying it, a method for manufacturing said cellulose nanofiber-thermoplastic resin composite masterbatch, and a plastic composition comprising said cellulose nanofiber-thermoplastic resin composite masterbatch. Plastic waste is emerging as a major environmental problem worldwide, and accordingly The plastics industry is seeking various changes to enhance sustainability and reduce environmental impact. We are not only introducing a circular economy model to create new products using recycled plastic and developing biodegradable plastics utilizing natural materials such as corn and sugarcane, but we are also using renewable energy and introducing carbon dioxide reduction technologies to reduce carbon emissions generated during the production of plastic products. In addition, various efforts are being made to gain consumer trust, such as obtaining eco-friendly certifications. As part of these efforts, methods for utilizing eco-friendly plastic additives are being researched and developed, and cellulose nanofiber (CNF) is attracting attention as an eco-friendly plastic additive because it can increase the strength of plastic products while simultaneously improving lightweighting and biodegradability. Since CNF is a carbon-neutral material derived from plants that absorb carbon dioxide, adding CNF to plastic products can significantly reduce carbon emissions. In particular, replacing fossil-based reinforcing agents such as carbon black and carbon fiber, which are mainly used in existing plastic compositions, with cellulose nanofibers can drastically reduce the use of fossil fuel-based carbon generated during the manufacturing process of plastic products. Although the use of CNF can improve the mechanical performance and eco-friendliness of plastics, CNFs have very small physical sizes and strong hydrophilicity, making it difficult to disperse them uniformly within a hydrophobic plastic matrix. Furthermore, if uniform dispersion at the nano level is not achieved, CNFs may actually impair the mechanical performance of the plastic rather than improve it. Therefore, various methods have been developed to uniformly disperse CNF into a plastic matrix. Registered Patent Publication No. 10-1642011 discloses a masterbatch characterized by containing cellulose nanofibers obtained by adding cellulose to a modified epoxy resin (A) having a hydroxyl value of 100 mg KOH/g or more and micronizing the cellulose by applying mechanical shear force, wherein the modified epoxy resin (A) is obtained by reacting the epoxy resin (B) with a compound (C) having a carboxyl group. However, the masterbatch has the problem that it is difficult to manufacture uniform CNF having a nano-sized size because it does not use nano-sized dispersed CNF but rather generates CNF by micronizing the cellulose through mechanical shear force, and it is difficult to use as an additive for various plastics because it contains epoxy resin. Therefore, a new method is required to uniformly disperse nanoscale CNFs within a plastic matrix. Figure 1 shows the results of measuring the change in water content over time while mixing water-dispersed cellulose nanofibers by introducing them into an open kneader and a pressurized kneader. Figure 2 shows the results of measuring the change in water content over time while passing water-dispersed cellulose nanofibers through a 3-roll mill. The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the present invention, and the present invention is defined only by the scope of the claims. The terms used herein are for describing the embodiments and are not intended to limit the invention. In this specification, the singular form includes the plural form unless specifically stated otherwise in the text. As used herein, "comprises" and/or "comprising" do not exclude the presence or addition of one or more other components in addition to the components mentioned. Unless otherwise defined, all terms used herein (including technical and scientific terms) may be used in a meaning commonly understood by