WO2023067676A1 - Procédé de fabrication de corps moulé sous forme de film - Google Patents

Procédé de fabrication de corps moulé sous forme de film Download PDF

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Publication number
WO2023067676A1
WO2023067676A1 PCT/JP2021/038531 JP2021038531W WO2023067676A1 WO 2023067676 A1 WO2023067676 A1 WO 2023067676A1 JP 2021038531 W JP2021038531 W JP 2021038531W WO 2023067676 A1 WO2023067676 A1 WO 2023067676A1
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WIPO (PCT)
Prior art keywords
film
mold
latex composition
molded article
producing
Prior art date
Application number
PCT/JP2021/038531
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English (en)
Japanese (ja)
Inventor
良太 奥西
Original Assignee
白石カルシウム株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 白石カルシウム株式会社 filed Critical 白石カルシウム株式会社
Priority to PCT/JP2021/038531 priority Critical patent/WO2023067676A1/fr
Priority to JP2022506032A priority patent/JP7033242B1/ja
Publication of WO2023067676A1 publication Critical patent/WO2023067676A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
    • B29C41/14—Dipping a core

Definitions

  • the present invention relates to a method for forming a film forming body using a film forming mold.
  • Various film molded products such as gloves, balloons, and sacks are manufactured as products that utilize the elasticity and conformability of rubber films.
  • Such film molded articles are required to have not only stretchability and conformability but also various properties depending on the application.
  • rubber gloves are used to protect workers' hands from the chemicals they handle. , heat resistance is required.
  • Rubber gloves made of chlorosulfonated polyethylene (CSM) are excellent in chemical resistance and heat resistance and are suitable as work gloves.
  • Patent Document 1 describes a composition for dipping a glove mold prepared by dissolving 100 parts by weight of CSM solid rubber in 350 parts by weight of a solvent.
  • Patent Document 2 describes a CSM latex obtained by colloidally dispersing CSM in water by the action of an emulsifier as a composition for dipping a glove mold.
  • JP-A-5-230702 Japanese Patent Application Laid-Open No. 2011-32590
  • Patent Document 1 Because the composition described in Patent Document 1 uses a large amount of solvent, it has a large impact on the environment. Patent Document 2 describes that even if a glove is made using CSM latex, it may not form a normal film on the surface of the mold. Patent Document 2 describes that the reason for this is that the CSM latex adhered to the surface of the mold flows before it dries.
  • an object of the present invention is to provide a method for producing a film forming body that has a small environmental load and excellent film-forming properties.
  • One aspect of the present invention is a method for producing a film molded product.
  • the method for producing the film molded body comprises: an attaching step of attaching a solution containing calcium ions to the surface of the film-forming mold; After the attaching step, a dipping step of dipping the membrane mold in a latex composition comprising a latex of chlorosulfonated polyethylene and sodium alginate; and a molding step of pulling up the film-forming mold from the latex composition and molding the film-forming body on the surface of the film-forming mold.
  • the number average molecular weight of the sodium alginate is preferably 400,000 to 3,000,000.
  • the latex composition preferably further contains at least one of carboxymethylcellulose, polyvinyl alcohol, and sodium polyacrylate.
  • the immersion time of the film forming mold in the immersion step is 60 to 120 seconds.
  • the method for manufacturing the film molded body further comprises a demolding step of removing the film molded body from the film molding mold, In the demolding step, it is preferable that the film molded body formed on the surface of the film forming mold is washed with water.
  • the above-mentioned method for manufacturing a film compact has a small environmental load and is excellent in film-forming properties.
  • the method for manufacturing a film molded article of the present embodiment includes an adhesion step, an immersion step, and a forming step.
  • the attachment step is a step of attaching a solution containing a calcium salt to the surface of the film forming mold (hereinafter simply referred to as the mold).
  • the mold preferably has a shape corresponding to the shape of the film molded product.
  • a mold used to produce a glove which is an example of a film molded product, imitates the shape of a human hand (including the portion from the wrist to the fingertips, and may further include the arm portion corresponding to the sleeve). It is an object, for example a ceramic or metal monolith.
  • the solution containing calcium ions is preferably an aqueous solution in which a water-soluble calcium salt is dissolved.
  • the calcium salt is preferably calcium nitrate or calcium chloride, particularly preferably calcium nitrate.
  • the solution containing calcium ions has the action of reacting with sodium alginate in the later-described latex composition to gel and solidify the latex composition.
  • a solution containing calcium ions is also referred to herein as a coagulant.
  • the concentration of calcium salt in the coagulant is preferably 5-50%. If the concentration of the calcium salt is less than 5%, it will be difficult to obtain a sufficient effect of gelling the latex composition.
  • % means % by weight. Adhesion of the coagulant to the mold is performed, for example, by dipping or coating.
  • the immersion step is a step of immersing the mold in a latex composition containing chlorosulfonated polyethylene (CSM) latex and sodium alginate after the adhesion step.
  • CSM latex is an emulsion of CSM microparticles dispersed in water. The fine particles of CSM are contained in the latex at, for example, 30-60%.
  • Sodium alginate has the function of rapidly reacting with calcium ions and gelling the latex composition.
  • the flow of the latex composition adhering to the mold is suppressed, and dripping is suppressed, thereby forming a good film on the surface of the mold. That is, the method for producing a film molded article of the present embodiment is excellent in film formability.
  • sodium alginate is a component that can increase the viscosity of the latex composition. Therefore, when the mold is pulled up from the latex composition, a large amount of the latex composition adheres to the mold, and the thickness of the film forming the film molded product can be effectively increased. If the latex composition does not contain sodium alginate, gelation due to reaction with calcium ions will not occur. not formed. In addition, it becomes difficult to increase the film thickness of the film.
  • the concentration of sodium alginate in the latex composition is preferably 0.1-1.0%, more preferably 0.4-0.6%. If the concentration of sodium alginate is lower than the above range, the latex composition may not be sufficiently gelled. Also, the viscosity of the latex composition may not be increased sufficiently. If the concentration of sodium alginate is higher than the above range, a large amount of unvulcanized gel remains on the surface of the film formed on the surface of the mold, which may make it difficult to remove the molded film from the mold.
  • Sodium alginate is preferably 0.3 to 4.0 parts by weight, more preferably 1.0 to 2.0 parts by weight, based on 100 parts by weight of the CSM latex.
  • the latex composition preferably further contains acid acceptors such as magnesium oxide and zinc oxide, and vulcanizing agents such as polyamines and polyols.
  • the latex composition preferably further contains an antifoaming agent in order to obtain a film molded product with few air bubbles.
  • the amount of the antifoaming agent added is, for example, 0.2 to 0.8 parts by weight per 100 parts by weight of the CSM latex in the latex composition.
  • the molding step is a step of pulling up the mold from the latex composition and molding the film molding on the surface of the mold.
  • the heat treatment is preferably carried out in an atmosphere of 60 to 160°C, more preferably 70 to 120°C, for preferably 30 to 180 minutes, more preferably 60 to 120 minutes.
  • the heat treatment for producing the gloves is preferably carried out with the mold pulled up from the latex composition, with the part of the mold corresponding to the fingertips facing up.
  • the mold pulled up from the latex composition is immersed in a mixture of different types of latex such as chloroprene rubber (CR) or nitrile rubber (NBR) (latex composition of other rubber).
  • CR chloroprene rubber
  • NBR nitrile rubber
  • An immersion treatment may also be performed.
  • the above-described method for producing a film-formed article can produce a film-formed article having a small environmental load, excellent film-forming properties, and excellent chemical resistance, heat resistance, weather resistance, and the like.
  • the film molded article has the properties of CSM such as elasticity, conformability, and flexibility, and is suitable for gloves, balloons, sacks, syringes, tubes, sleeve covers, shoe covers, and the like.
  • the film thickness of the film forming the film molded article obtained by the method for producing the film molded article of the present embodiment is preferably 0.1 to 2.0 mm, more preferably 0.20 to 0.50 mm.
  • a film thickness within the above range is preferable when the molded film is a glove, a finger cot, or the like.
  • the film thickness of the film forming the film forming article is preferably 1.0 to 2.0 mm.
  • the method for manufacturing the film molded body of the embodiment further includes a heating step.
  • the heating step is a step of heating the mold so that the mold to which the coagulant is attached is dry before the dipping step.
  • the mold to which the coagulant is adhered can be dried quickly before the dipping step, improving the productivity of the film molded product. Since the coagulant is dry, the effect of gelling the latex composition can be obtained uniformly on the surface of the mold, and the occurrence of unevenness in the film thickness of the film forming the molded film can be suppressed.
  • the heating process is preferably performed after the adhesion process, but it is also preferable to perform it before the adhesion process, and it is also preferable to perform it before and after the adhesion process.
  • the mold is preferably heated to 60-80°C. When the temperature is lower than 60°C, the coagulant cannot be dried quickly, and it is difficult to improve the productivity of the film forming product. If the temperature exceeds 80°C, the temperature of the mold during the dipping step is too high, the viscosity of the latex composition in contact with the mold decreases, and the amount of the latex composition adhering to the mold decreases. It tends to be thin.
  • the method for manufacturing a film molded article of the embodiment further includes a cooling step of cooling the mold heated in the heating step before the immersion step.
  • the viscosity of the latex composition in contact with the mold is reduced during the dipping step, preventing the amount of the latex composition adhering to the mold from decreasing and effectively increasing the film thickness of the molded film. can.
  • Cooling of the mold is carried out until the mold is preferably at room temperature (eg 25° C.). Cooling of the mold is preferably carried out by allowing the mold to cool without blowing air or the like, in order to avoid unevenness in the film thickness.
  • the viscosity at 25° C. measured according to JIS Z8803:2011 using a rotational viscometer at a rotational speed of 6 rpm is preferably 500 to 20000 mPa ⁇ s, more preferably 2000 to 15000 mPa ⁇ s. is s.
  • the viscosity measured in the same manner as above except that the rotation speed is 60 rpm is preferably 100 to 5000 mPa ⁇ s, more preferably 500 to 4000 mPa ⁇ s.
  • the number average molecular weight of sodium alginate is preferably 200,000 to 3,000,000, more preferably 500,000 to 2,000,000.
  • sodium alginate having such a molecular weight it is easy to adjust the viscosity of the latex composition within the range described above, so that a large amount of the latex composition adheres to the pulled up mold, and the film formed on the surface of the mold is thin. The film thickness can be effectively increased.
  • molecular weight refers to that measured using a gel permeation chromatography (GPC) method.
  • the latex composition preferably further contains at least one of carboxymethylcellulose, polyvinyl alcohol, and sodium polyacrylate in addition to sodium alginate. These substances have the function of increasing the viscosity of the latex composition, can further increase the viscosity of the latex composition, and contribute to increasing the film thickness of the coating.
  • the total concentration of these substances in the latex composition is preferably 0.1-1.0%, more preferably 0.3-0.7%.
  • the temperature of the latex composition is preferably maintained at 30°C or lower, more preferably 10 to 25°C, in order to increase the thickness of the film.
  • the temperature of the latex composition is preferably maintained at 30°C or lower, more preferably 10 to 25°C, in order to increase the thickness of the film.
  • the immersion time of the mold in the immersion step is preferably 30 to 180 seconds, more preferably 60 to 120 seconds. If the immersion time is shorter than the above range, gelation in the latex composition in which the mold is immersed will be insufficient, making it difficult to suppress dripping after the mold is pulled out. If the immersion time is longer than the above range, it is difficult to improve the productivity of the film-formed product.
  • the method for manufacturing a film molded product of the present embodiment further includes a demolding step.
  • the demolding step is a step of removing the film molded body from the mold.
  • the film formed on the surface of the mold is washed with water.
  • unvulcanized hardened gel remaining on the surface of the film can be washed off, and the flexibility of the CSM film can be exhibited to facilitate demolding.
  • the water washing of the film molded product can be performed, for example, by immersing the film molded product together with the mold in water.
  • the immersion time is preferably 60-120 seconds.
  • air bubbling of water is preferred in order to promote dissolution of the unvulcanized gel in water. Since the unvulcanized gel easily dissolves in water, there is no need to rub the surface of the film by hand in water.
  • composition means the latex composition.
  • the latex composition contains 0.5% of the "components in the composition” shown in the table, and in Example 4, further, “other components in the composition” shown in the table Contains 0.25%.
  • coagulant means the solution that adheres to the surface of the mold prior to the dipping step.
  • cooling before immersion means that the mold to which the coagulant was adhered was subjected to heat treatment for drying, and then allowed to cool to room temperature (25°C) before the immersion step. . In the examples where "cooling before immersion” was “none”, the immersion step was performed within 60 seconds after the mold was dried by heating.
  • Releasability was rated as A when the glove could be removed from the mold without washing with water, and B when the glove could be removed from the mold by washing with water. A was evaluated as excellent in demoldability, and B and C were evaluated as poor demoldability. The glove was washed with water by immersing the glove together with the mold in water for 120 seconds and gently rocking the glove during that time.
  • the film thickness is measured using a micrometer at 5 or more points on the obtained glove, and is shown in the range of the maximum and minimum values of the measured values.
  • films with a minimum film thickness of 0.2 mm or more were evaluated as having a sufficient film thickness, and films with a minimum film thickness of less than 0.2 mm were evaluated as having an insufficient film thickness.
  • Example 1 From the comparison between Example 1 and Comparative Examples 1 and 2, by immersing the mold to which the solution containing calcium ions was adhered in the latex composition containing sodium alginate, excellent film-forming properties and releasability, and sufficient It can be seen that a film molded article having a thickness can be obtained.
  • Comparative Example 1 ⁇ -carrageenan in the composition solidified, resulting in poor workability.
  • the film thickness was insufficient and demolding was difficult. The film thickness did not change even when the film-formed article was produced in the same manner with a longer immersion time.
  • Example 1 From the comparison between Example 1 and Comparative Example 3, it was found that by including sodium alginate in the latex composition and calcium ions in the coagulant, a film molded article having excellent film-forming properties and releasability and a sufficient thickness was obtained. is obtained.
  • Comparative Example 3 sodium alginate in the coagulant gelled, but dripping occurred and no latex composition film was formed. Therefore, evaluation of releasability and measurement of film thickness could not be performed.
  • Comparative Examples 1 and 2 and Examples 1 to 5 a film was formed on all the immersed portions of the mold.
  • Example 1 and 3 and Example 2 From the comparison between Examples 1 and 3 and Example 2, it can be seen that the thickness of the film increases when the number average molecular weight of sodium alginate is 1,500,000 or more. From the comparison between Example 1 and Example 4, it can be seen that the film thickness of the film increases when the latex composition contains a predetermined substance. From the comparison between Example 1 and Example 5, it can be seen that the thickness of the film increases by cooling the heated mold before the immersion step.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulding By Coating Moulds (AREA)

Abstract

Selon un mode de réalisation de l'invention, un procédé de fabrication de corps moulé sous forme de film comporte : une étape d'adhésion au cours de laquelle une solution contenant des ions calcium est mise en adhésion à la surface d'un moule pour formation de film ; une étape d'immersion au cours de laquelle après ladite étape d'adhésion, ledit moule pour formation de film est plongé dans une composition de latex contenant un latex de polyéthylène chlorosulfoné et un alginate de sodium ; et une étape de moulage au cours de laquelle ledit moule pour formation de film est extrait de ladite composition de latex, et un corps moulé sous forme de film est moulé à la surface dudit moule pour formation de film.
PCT/JP2021/038531 2021-10-19 2021-10-19 Procédé de fabrication de corps moulé sous forme de film WO2023067676A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2021/038531 WO2023067676A1 (fr) 2021-10-19 2021-10-19 Procédé de fabrication de corps moulé sous forme de film
JP2022506032A JP7033242B1 (ja) 2021-10-19 2021-10-19 膜成形体の製造方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2021/038531 WO2023067676A1 (fr) 2021-10-19 2021-10-19 Procédé de fabrication de corps moulé sous forme de film

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023234238A1 (fr) * 2022-06-01 2023-12-07 住友精化株式会社 Composition de latex
CN115216031A (zh) * 2022-07-28 2022-10-21 康迪菲（苏州）生物科技有限公司 原位海藻酸钠水凝胶一次性手套及其制备方法
WO2024070750A1 (fr) * 2022-09-26 2024-04-04 住友精化株式会社 Procédé de production d'un objet formé par immersion, et objet formé par immersion

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002241412A (ja) * 2000-12-12 2002-08-28 Takeda Chem Ind Ltd ディップ成形用ラテックス及びディップ成形物
JP2005200559A (ja) * 2004-01-16 2005-07-28 Nippon A & L Kk ディップ成形用ラテックス、ディップ成形用組成物及びディップ成形物
CN109093910A (zh) * 2018-06-29 2018-12-28 南通嘉得利安全用品有限公司 乳胶劳动防护手套的制造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002241412A (ja) * 2000-12-12 2002-08-28 Takeda Chem Ind Ltd ディップ成形用ラテックス及びディップ成形物
JP2005200559A (ja) * 2004-01-16 2005-07-28 Nippon A & L Kk ディップ成形用ラテックス、ディップ成形用組成物及びディップ成形物
CN109093910A (zh) * 2018-06-29 2018-12-28 南通嘉得利安全用品有限公司 乳胶劳动防护手套的制造方法

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JP7033242B1 (ja) 2022-03-09

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