Search

CN-121986022-A - Method for producing blow-molded article, resin composition, and pellet

CN121986022ACN 121986022 ACN121986022 ACN 121986022ACN-121986022-A

Abstract

A method for producing a blow-molded article, wherein migration of a wax-derived component to the surface of the blow-molded article is prevented. The method for producing a blow-molded article comprises a step of obtaining a blow-molded article by blow-molding a resin mixture containing at least a wax, polyethylene or polypropylene, and a carbodiimide compound.

Inventors

  • Doi Harukahira
  • ASHIBE TSUNENORI

Assignees

  • 佳能株式会社

Dates

Publication Date
20260505
Application Date
20241001
Priority Date
20231003

Claims (16)

  1. 1. A method for producing a blow-molded article, comprising a step of obtaining a blow-molded article by blow-molding a resin mixture containing at least a wax, polyethylene or polypropylene, and a carbodiimide compound.
  2. 2. The method for producing a blow-molded article according to claim 1, Wherein the polyethylene or polypropylene is polyethylene, and The polyethylene is at least one selected from the group consisting of high-density polyethylene, low-density polyethylene and linear low-density polyethylene.
  3. 3. The method for producing a blow-molded article according to claim 1, Wherein the polyethylene or polypropylene is polypropylene, and The polypropylene is at least one selected from the group consisting of a homopolymer, a random copolymer, and a block copolymer.
  4. 4. The method for producing a blow-molded article according to any one of claims 1 to 3, wherein the wax comprises an ester wax.
  5. 5. The method for producing a blow-molded article according to any one of claims 1 to 4, wherein the blow-molded article is a toner bottle.
  6. 6. The method for producing a blow-molded article according to any one of claims 1 to 5, wherein the blow-molded article is a stretch blow-molded article or a direct blow-molded article.
  7. 7. The method for producing a blow-molded article according to any one of claim 1 to 5, Wherein the step of obtaining a blow-molded article comprises A step of obtaining pellets of a melt-kneaded product of the resin mixture, and A step of direct blow molding using the pellets.
  8. 8. The method for producing a blow-molded article according to any one of claim 1 to 5, Wherein the step of obtaining a blow-molded article comprises Inserting the melt-kneaded product of the resin mixture into a mold, introducing a gas, and stretching the resin mixture.
  9. 9. The method for producing a blow-molded article according to any one of claim 1 to 5, Wherein the step of producing the blow-molded article comprises A step of obtaining pellets of a melt-kneaded product of the resin mixture, A step of manufacturing a preform using the pellets, and A step of blow-molding the preform.
  10. 10. The method for producing a blow-molded article according to claim 9, wherein the preform has a test tube shape.
  11. 11. The method for producing a blow-molded article according to claim 9 or 10, Wherein the step of blow molding the preform comprises A step of stretching the preform in a length direction of the preform using a stretching rod, and A step of introducing a gas into the preform and stretching the preform in the circumferential direction.
  12. 12. The method for producing a blow-molded article according to any one of claim 1 to 5, Wherein the step of producing the blow-molded article comprises A step of melt-kneading the wax and the polyethylene or polypropylene to form a first pellet, A step of melt kneading the carbodiimide compound and other polyethylene or polypropylene to form a second pellet, A step of mixing the first pellet and the second pellet to obtain a pellet mixture, and A step of blow molding the pellet mixture.
  13. 13. The method of manufacturing a blow-molded article according to claim 12, wherein the step of blow-molding includes the step of injection-molding the pellet mixture.
  14. 14. The method for producing a blow-molded article according to any one of claims 1 to 13, wherein the content of the carbodiimide compound in the resin mixture is 400 to 1500 parts by mass per 100 parts by mass of the wax.
  15. 15. A resin composition comprising the melt-kneaded product of a wax, polyethylene or polypropylene, and a carbodiimide compound.
  16. 16. A pellet comprising the melt-kneaded product of a wax, polyethylene or polypropylene, and a carbodiimide compound.

Description

Method for producing blow-molded article, resin composition, and pellet Technical Field The present disclosure relates to a method for producing blow-molded articles, a resin composition, and pellets. Background In an electrophotographic image forming apparatus, since a toner bottle for supplying toner or the like needs to have sufficient strength without breaking upon dropping, a blow-molded article made of polyethylene (hereinafter referred to as "PE") or polypropylene (hereinafter referred to as "PP") may be used in addition to polyethylene terephthalate as a polyester resin (patent document 1). In recent years, in order to protect the environment, thermoplastic resin articles and parts thereof are collected and then regenerated and recovered by temporarily changing the original shape thereof. Here, as a method of recovering a thermoplastic resin such as polyethylene or polypropylene, as described in paragraph [0002] in patent document 2, chemical recovery and material recovery are known. Prior art literature Patent literature [ Patent document 1] Japanese patent laid-open No. H06-067536 Patent document 2 japanese patent laid-open No. 2009-001693 Disclosure of Invention Problems to be solved by the invention The chemical recovery as disclosed in patent document 2 requires a multi-step process, which requires a decomposition facility and a polymerization facility, resulting in high recovery costs. In addition, it has a large environmental load. On the other hand, in material recovery, a step of cleaning the bottle is generally performed. However, the bottle may be washed several times with water, acid, alkali, etc., and a drying process is also required. Therefore, the cleaning bottle also increases environmental load. Here, in order to reduce the environmental load, the present inventors have simplified or omitted the cleaning of the toner bottle to be recovered, and manufactured the toner bottle again using polyethylene or polypropylene (hereinafter referred to as "material recovery PE" or "MR-PE" or "material recovery PP" or "MR-PP") obtained from the toner bottle to which the toner is still attached. Accordingly, the present inventors found that when toner is stored in a toner bottle obtained in this way, the surface of toner particles sometimes deforms at the contact point between the toner inside the toner bottle and the inner surface of the toner bottle. Toner particles having deformed surfaces may cause development failure such as insufficient transfer during electrophotographic development (when toner is transferred to a photosensitive drum), and as a result, may cause image density unevenness in an electrophotographic image. At least one aspect of the present disclosure provides a method of manufacturing a blow-molded article capable of preventing migration of wax-derived components to the surface of the blow-molded article. At least one aspect of the present disclosure provides a resin composition that helps prevent migration of wax-derived components to the surface of a blow-molded article. At least one aspect of the present disclosure provides pellets that help prevent migration of wax-derived components to the surface of a blow-molded article. Solution for solving the problem According to at least one aspect of the present disclosure, there is provided a method of manufacturing a blow-molded article, the method comprising the step of obtaining a blow-molded article by blow-molding a resin mixture containing at least wax, polyethylene or polypropylene, or a carbodiimide compound. According to at least one aspect of the present disclosure, there is provided a resin composition comprising a melt-kneaded product of a wax, polyethylene or polypropylene, and a carbodiimide compound. According to at least one aspect of the present disclosure, there is provided pellets comprising a melt-kneaded product of a wax, polyethylene or polypropylene, and a carbodiimide compound. Advantageous effects of the invention According to at least one aspect of the present disclosure, a method of manufacturing a blow-molded article capable of preventing migration of wax-derived components to the surface of the blow-molded article can be obtained. According to at least one aspect of the present disclosure, a resin composition that helps prevent migration of wax-derived components to the surface of a blow-molded article can be obtained. Further, according to at least one aspect of the present disclosure, it is possible to obtain pellets that help prevent migration of wax-derived components to the surface of the blow-molded article. Drawings Fig. 1 is a schematic diagram of an image forming apparatus. Fig. 2 is a schematic diagram showing a preform forming method. Fig. 3 is a schematic diagram showing a stretch blow molding method. Fig. 4 is a schematic illustration of a one-step stretch blow molding process. Fig. 5 is a schematic diagram of direct blow molding. FIG. 6 is a schematic view of a biaxially stretched blow m