CN-122003458-A - Biological filler for reinforcing resin and resin composition containing same

Abstract

The present invention provides a resin reinforcing material comprising a bio-filler of plant origin and a latex coating layer formed on the surface of the bio-filler, the latex coating layer comprising a conjugated diene rubber containing carboxyl groups, a method for producing the same, a resin composition comprising the same, and a composite produced from the resin composition.

Inventors

• Han Zhengzhen
• Wu Xuanze
• Jiang Quanhan
• Jin Haohun
• Lv Longhao
• JIN LONGZHEN

Assignees

• 株式会社LG化学

Dates

Publication Date

20260508

Application Date

20250528

Priority Date

20240826

Claims (15)

1. 1. A resin reinforcing material comprising a plant-derived bio-filler and a latex coating formed on the surface of the bio-filler, Wherein the latex coating comprises a carboxyl group-containing conjugated diene rubber.
2. 2. The resin-reinforced material according to claim 1, wherein the bio-filler comprises one or more selected from the group consisting of wood flour of pine, spruce, acacia or rubber tree, plants such as kenaf, flax, hemp, jute or bamboo seed, grains such as wheat or barley, shells such as coconut husk or coffee grounds, and natural fibers such as cellulose or lignocellulose.
3. 3. The resin reinforcing material according to claim 1, wherein the carboxyl group-containing conjugated diene rubber contained in the latex coating layer includes one or more selected from the group consisting of a carboxyl group-containing nitrile rubber, a carboxyl group-containing styrene-butadiene rubber, and a carboxyl group-containing conjugated diene rubber.
4. 4. The resin-reinforced material of claim 1, wherein the bio-filler comprises primary particles and secondary particles formed by coalescence of one or more primary particles, and The latex coating is formed on the surface of the primary particles and the surface of the secondary particles.
5. 5. The resin-reinforced material according to claim 4, wherein the primary particles of the bio-filler have an average particle diameter of 10 μm to 250 μm, and The secondary particles of the biological filler have an average particle diameter of 100 μm to 2500 μm.
6. 6. The resin-reinforced material according to claim 1, wherein the latex coating layer is formed on the surface of the bio-filler at a thickness of 0.2 μm to 50 μm.
7. 7. The resin-reinforced material according to claim 1, wherein the resin-reinforced material comprising a bio-filler and a latex coating formed on the surface of the bio-filler has an average particle diameter of 0.1 mm to 10 mm.
8. 8. A method of manufacturing a resin reinforcing material, the method comprising: (S1) adding a bio-filler to a high-speed mixer and stirring while spraying a latex coating liquid to form a latex coating on the surface of the bio-filler, and (S2) drying and then compressing the bio-filler having the latex coating formed thereon.
9. 9. The method for producing a resin reinforcing material according to claim 8, wherein the latex coating liquid contains a carboxyl group-containing conjugated diene rubber, and the amount of the carboxyl group-containing conjugated diene rubber used is 0.5 to 30% by weight based on the weight of the biological filler.
10. 10. The method for producing a resin-reinforced material according to claim 8, wherein the stirring is performed at 500 rpm to 1500 rpm.
11. 11. The method for producing a resin-reinforced material according to claim 8, wherein the compression is performed at a temperature of 70 ℃ to 250 ℃ and a pressure of 10 bar to 70 bar.
12. 12. A resin composition comprising a resin reinforcing material comprising a polymer resin and a bio-filler, on which a latex coating is formed.
13. 13. The resin composition of claim 12, wherein the resin reinforcing material is present in an amount of 1 to 40 wt% based on the total weight of the composition.
14. 14. The resin composition of claim 12, wherein the polymer resin comprises one or more thermoplastic resins selected from the group consisting of polylactic acid (PLA), polybutylene adipate (PBAT), polyethylene (PE), polypropylene (PP), acrylonitrile-butadiene-styrene (ABS), polyvinyl chloride (PVC), polyethylene terephthalate (PET), or a mixture thereof, and thermosetting resins including epoxy resins, amino resins, phenolic resins, polyester resins, polyurethane resins, or a mixture thereof.
15. 15. A composite material prepared by extrusion molding the resin composition of claim 12.

Description

Biological filler for reinforcing resin and resin composition containing same Cross Reference to Related Applications The present application claims priority from korean patent application No. 10-2024-014178 filed on 8.26 of 2024, the entire contents of which are incorporated herein as part of the specification. Technical Field The present invention relates to a bio-filler for reinforcing a resin and a resin composition comprising the same, and more particularly, to a bio-filler having improved moisture resistance and physical properties by surface modification and a resin composition comprising the same as a reinforcing material. Background Recently, in various fields such as packaging materials, molded articles, and various industrial materials, the production of composite materials using environmentally friendly materials as reinforcing materials for improving physical properties of polymer resins has been increasing. For example, in the case of building materials and general living goods, a composite material, that is, a biocomposite material, which is produced by dispersing wood flour in a thermoplastic resin such as Polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), acrylonitrile-butadiene-styrene (ABS), polyethylene terephthalate (PET), polylactic acid (PLA), polybutylene adipate terephthalate (PBAT), and then extrusion molding, has been developed. In addition to the characteristics of polymer resins such as workability, low cost, and high surface strength, biocomposite materials have various advantages such as environmental friendliness due to the use of wood flour derived from plants, increased hardness, which is a disadvantage of polymer resins, and unique wood texture. Such biocomposites are also used in automotive interiors and exteriors and in household appliances. In addition, a composite material of cellulose fibers is used for the purpose of weight reduction and recycling improvement, instead of a high-density inorganic reinforcing material which has been used in other molded articles. Meanwhile, plant-derived bio-fillers, such as wood flour and cellulose fibers, used for manufacturing environment-friendly composite materials, exhibit hydrophilicity due to hydroxyl groups present on the surface and are easily affected by moisture. Thus, when moisture permeates into the product to which the bio-filler is applied, expansion or swelling occurs to cause a dimensional change. The bio-filler has low compatibility with the hydrophobic polymer resin due to its hydrophilicity, which reduces interfacial bonding force between heterogeneous materials, resulting in deterioration of physical properties. In addition, since the bio-filler is formed of a highly crystalline polymer, it is hard and easily broken, and thus impact resistance is insufficient. Therefore, the bio-filler used in the resin composition for manufacturing the composite is dried as much as possible to adjust the moisture content, or a compatibilizer for improving the binding force between the bio-filler and the polymer resin, an additive for improving the impact resistance, or the like is used, but there is a limit in overcoming the moisture resistance and the impact resistance of the bio-filler. Disclosure of Invention Technical problem The present invention aims to provide a bio-filler having improved physical properties such as moisture resistance and impact resistance by surface modification, a method for producing the same, and a resin composition and a composite containing the bio-filler as a reinforcing material. Technical proposal In one general aspect, a resin reinforcing material includes a plant-derived bio-filler and a latex coating formed on a surface of the bio-filler, wherein the latex coating includes a carboxyl-containing conjugated diene-based rubber. In another general aspect, a method of manufacturing a resin reinforcing material includes (S1) adding a bio-filler to a high-speed mixer and stirring while spraying a latex coating liquid to form a latex coating layer on a surface of the bio-filler, and (S2) drying and then compressing the bio-filler having the latex coating layer formed thereon. In yet another general aspect, there is provided a resin composition including a polymer resin and a resin reinforcing material including a bio-filler having a latex coating formed thereon, and a composition produced by extrusion molding of the composition. Advantageous effects According to the present invention, the moisture resistance of the bio-filler can be overcome by chemical modification by forming a latex coating layer on the surface of the bio-filler used as a resin reinforcing material, and bonding hydroxyl groups present on the surface of the bio-filler with carboxyl groups of the latex rubber. In addition, when the latex-coated bio-filler is mixed with the polymer resin to form a composite, the latex coating acts as an adhesive to increase compatibility between the bio-filler and the polymer resin to imp