Low-odor bio-fiber modified PLA (polylactic acid) as well as preparation method and application thereof

Abstract

The invention relates to the field of PLA (polylactic acid), in particular to low-odor bio-fiber modified PLA as well as a preparation method and application thereof. The composite material comprises the following substances in parts by weight: 1-5 parts of porous biological fibers, 1-5 parts of molecular sieve powder, 60-90 parts of a PLA production raw material, 10-25 parts of a mineral filler, 0.1-0.4 part of an antioxidant and 0.1-0.5 part of a chain extender. The method comprises the following steps: 1, carrying out porous treatment on biological fibers; 2, carrying out molecular sieve grinding treatment; 3, mixing: mixing 1-5 parts of the biological fiber subjected to porous treatment, 1-5 parts of molecular sieve powder, 60-90 parts of a PLA production raw material, 10-25 parts of a mineral filler, 0.1-0.4 part of an antioxidant and 0.1-0.5 part of a chain extender; and 4, in the granulation process, adsorbing small molecules generated in the PLA resin melting process by adopting the biological fibers subjected to porous treatment and the molecular sieve powder.

Description

Technical Field

[0001] The invention relates to the field of PLA, in particular to low-odor biofiber modified PLA and a preparation method and application thereof. Background Art

[0002] PLA material is usually non-toxic and odorless, but if it contains hemp fiber, it will have a pungent smell. PLA is a biodegradable plastic and a low-carbon and environmentally friendly material, but in terms of promotion and application, compared with traditional plastic PP and PE materials, it has a stronger odor, which reduces the product experience.

[0003] On December 17, 2024, a search was conducted in the Chinese Patent Publication Database with "PLA and odor and adsorption and molecular sieve" as abstract keywords, with the option to allow synonym expansion, and no relevant literature was found.

[0004] On December 17, 2024, a search was conducted on the website of the United States Patent and Trademark Office for "PLA with odor with adsorption with molecular sieve", and no relevant literature was found; the search URL was https: / / ppubs.uspto.gov / pubwebapp / .

[0005] On December 17, 2024, a search was conducted on the Korean Patent Office for "PLA and odor and adsorption and molecular sieve", and no relevant literature was found; the search URL was http: / / eng.kipris.or.kr / enghome / main.jsp.

[0006] On December 17, 2024, a search was conducted on WIPO's https: / / patentscope2.wipo.int / for "PLA and odor and adsorption and molecular sieve", and no relevant literature was found.

[0007] On December 17, 2024, a search for "PLA and odor and adsorption and molecular sieve" was conducted on the Japan Patent Office website https: / / www.j-platpat.inpit.go.jp / , but no relevant literature was found.

[0008] Completely different from the concept of this patent. Summary of the invention

[0009] Purpose of the invention: To provide a low-odor biofiber modified PLA with better effect and a preparation method and use thereof. The specific purpose can be seen in the multiple substantial technical effects in the specific implementation part.

[0010] In order to achieve the above purpose, the present invention adopts the following technical solutions: The low-odor biofiber modified PLA is characterized by comprising the following components by weight: 1-5 parts of porous biofiber, 1-5 parts of molecular sieve powder, 60-90 parts of PLA production raw materials, 10-25 parts of mineral fillers, 0.1-0.4 parts of antioxidants, and 0.1-0.5 parts of chain extenders; The method for preparing low-odor biofiber modified PLA is characterized by comprising the following steps: First: porous treatment of biofiber; Second: Molecular sieve grinding treatment; Third: Mixing: 1-5 parts of porous biofiber, 1-5 parts of molecular sieve powder, 60-90 parts of PLA production raw materials, 10-25 parts of mineral filler, 0.1-0.4 parts of antioxidant, and 0.1-0.5 parts of chain extender; Fourth: In the granulation process, porous bio-fibers and molecular sieve powders are used to adsorb small molecules generated during the melting process of PLA resin.

[0011] A further technical solution of the present invention is that the temperature is 100-200°C, the pressure is increased to 1.5-2.0 MPa, and the high temperature and high pressure are maintained for 20-30 minutes. After reaching the predetermined temperature and pressure, the pressure and heat are maintained for 15-20 minutes, so that the moisture inside the bamboo sheet in the tank begins to evaporate, the pressure in the tank increases, and the sealing cover is opened to obtain biological fiber through instantaneous pressure relief.

[0012] A further technical solution of the present invention is that the biological fiber is hemp fiber.

[0013] A further technical solution of the present invention is that a vacuum deashing arrangement is also included after the fourth step, and a twin-screw granulator is used for vacuum deashing to remove small molecules that cannot be adsorbed by the biofiber and the molecular sieve powder.

[0014] Low-odor biofiber modified PLA is used in the production of 3D printing filaments, degradable lunch boxes, degradable packaging, and degradable disposable hotel supplies.

[0015] The present invention adopting the above technical solution has the following beneficial effects compared with the prior art: after high-temperature granulation, the hemp fiber has a strong odor, which reduces the user experience of the product; by high-temperature explosion treatment of biological fiber, we increase the surface pores of biological fiber, which can absorb small molecules generated during the melting process of PLA, thereby reducing the odor of the product. At the same time, we add molecular sieve powder to the formula, retaining the porous structure of the molecular sieve, which can further absorb small molecules in the PLA resin. In addition, the odor of the material is improved through the double vacuum deashing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to further illustrate the present invention, the following is further described in conjunction with the accompanying drawings: Figure 1 A diagram of the steps of the invention. DETAILED DESCRIPTION

[0017] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0018] The low-odor biofiber-modified PLA is characterized by comprising the following components by weight: 1-5 parts of porous biofiber, 1-5 parts of molecular sieve powder, and 2-90 parts of PLA production raw materials.

[0019] The method for preparing low-odor biofiber modified PLA is characterized by comprising the following steps: First: porous treatment of biofiber; Second: Molecular sieve grinding treatment; Third: Mixing: 1-5 parts of porous biofiber, 1-5 parts of molecular sieve powder, and 2-90 parts of PLA production raw materials; Fourth: In the granulation process, porous bio-fibers and molecular sieve powders are used to adsorb small molecules generated during the melting process of PLA resin.

[0020] 100-200℃, pressure rises to 1.5-2.0mpa, high temperature and high pressure for 20-30min. After reaching the predetermined temperature and pressure, maintain pressure and heat for 15-20min to make the moisture inside the bamboo sheet in the tank begin to evaporate, the pressure in the tank increases, open the sealing cover, and obtain bio-fiber through instant pressure relief.

[0021] The biological fiber is hemp fiber.

[0022] The high temperature explosion treatment is a high temperature treatment under vacuum. The fourth step also includes a vacuum deashing arrangement, which uses a twin-screw granulator to remove small molecules that cannot be adsorbed by biofiber and molecular sieve powder.

[0023] Low-odor biofiber modified PLA is used in the production of 3D printing filaments, degradable lunch boxes, degradable packaging, and degradable disposable hotel supplies.

[0024] Molecular sieve refers to a substance with uniform micropores that can sieve different molecules because its pore size is comparable to the size of the molecule. It is a kind of aluminosilicate microporous crystal, with a basic skeleton structure composed of silicon oxygen and aluminum oxygen tetrahedrons. There are many channels with uniform pore size and holes with disordered arrangement and large internal surface area in the structure.

[0025] 1-5 parts of porous biological fiber, the plant fiber is selected from at least one of hemp fiber, bamboo fiber and wheat straw fiber; 1-5 parts of molecular sieve powder; 60-90 parts of PLA production raw materials; 10-25 parts of mineral filler, wherein the filler of the mineral filler is selected from at least one of talc, calcium carbonate, wollastonite and mica; 0.1-0.4 parts of antioxidant, wherein the antioxidant is at least one of hindered phenol antioxidant, aromatic secondary amine antioxidant, phosphite antioxidant and thioether antioxidant; 0.1-0.5 parts of chain extender, the chain extender is a polycyclic epoxy chain extender.

[0026] Innovatively, each of the above effects exists independently, and a set of structures can be used to combine the above results.

[0027] It should be noted that the multiple modules of this patent are the integration of modules of the prior art and do not involve new modules. Even if some modules use programs, the programs are undoubtedly known programs.

[0028] The basic principle, main features and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the protection required.

Claims

1. Low odor biofiber modified PLA, characterized by: The material comprises the following components by weight: 1-5 parts of porous biofiber, 1-5 parts of molecular sieve powder, 60-90 parts of PLA production raw materials, 10-25 parts of mineral fillers, 0.1-0.4 parts of antioxidants, and 0.1-0.5 parts of chain extenders.

2. A method for preparing low-odor biofiber modified PLA, characterized in that: The following steps are included: First: porous treatment of biofiber; Second: Molecular sieve grinding treatment; Third: Mix the components by weight, mixing 1-5 parts of porous biofiber, 1-5 parts of molecular sieve powder, 60-90 parts of PLA production raw materials, 10-25 parts of mineral filler, 0.1-0.4 parts of antioxidant, and 0.1-0.5 parts of chain extender; Fourth: In the granulation process, porous bio-fiber and molecular sieve powder are used to adsorb small molecules generated during the melting process of PLA resin.

3. The method for preparing low-odor biofiber modified PLA according to claim 2, characterized in that: The porous treatment of bio-fiber refers to: 100-200℃, pressure increased to 1.5-2.0mpa, high temperature and high pressure for 20-30min. After reaching the predetermined temperature and pressure, the pressure and heat preservation are maintained for 15-20min, so that the moisture inside the bamboo sheet in the tank begins to evaporate, the pressure in the tank increases, and the sealing cover is opened to obtain the bio-fiber through instantaneous pressure relief.

4. The method for preparing low-odor biofiber modified PLA according to claim 2, characterized in that: The biological fiber is hemp fiber.

5. The method for preparing low-odor biofiber modified PLA according to claim 2, characterized in that: The fourth step also includes a vacuum deashing arrangement, in which a twin-screw granulator is used for vacuum deashing to remove small molecules that cannot be adsorbed by the biofiber and molecular sieve powder.

6. The use of low-odor biofiber modified PLA in the production of 3D printing filaments, degradable lunch boxes, degradable packaging, and degradable disposable hotel supplies.

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