Dip molded article and method for manufacturing dip molded article

A technology of dip molding and surface treatment, which is applied to devices and coatings that apply liquid to the surface. It can solve the problems of chlorination and decrease in tensile strength, and achieve excellent resistance to drop in tensile strength and excellent wear and tear. Effect

Active Publication Date: 2016-11-09
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such surface treatment using an aqueous solution of sodium hypochlorite is usually performed to improve the detachability of the dipped molded product. The inside of the molded product is impregnated, so chlorine is added not only to the surface but also to the inside, so there is a problem that the tensile strength decreases

Method used

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  • Dip molded article and method for manufacturing dip molded article

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0077] Hereinafter, the present invention will be further described based on detailed examples, but the present invention is not limited to these examples. In addition, in the following, unless otherwise specified, "part" is based on weight. In addition, tests and evaluations are as follows.

[0078] dynamic friction coefficient

[0079] The dynamic friction coefficient was measured based on ASTM D-1894 using a surface property measuring device (trade name "HEIDON-14D", manufactured by Shinto Scientific Co., Ltd.). Specifically, a test piece cut out from the palm of a surface-treated dipped molded product (glove) (a surface-untreated dipped molded product in Comparative Example 1) was attached to a mobile phone with the surface treated as the surface. As for the weight, the moving weight with the test piece attached was run on the stainless steel plate at a speed of 150 mm / min and a moving distance of 130 mm, and the running resistance (dynamic friction coefficient) caused...

manufacture example 1

[0094] Manufacture of latex containing carboxyl nitrile rubber (a)

[0095] In a pressure-resistant polymerization reactor, 29 parts of acrylonitrile, 5.5 parts of methacrylic acid, 0.5 parts of tertiary dodecyl mercaptan as a molecular weight regulator, 150 parts of deionized water, 2.5 parts of deionized Sodium dialkylbenzenesulfonate replaced the internal gas with nitrogen three times, and then charged 65.5 parts of 1,3-butadiene. Next, after charging 0.2 parts of potassium persulfate and 0.1 part of sodium ethylenediaminetetraacetate, the temperature in the system was set at 39°C to start the polymerization reaction. The polymerization reaction was continued until the polymerization conversion ratio became 97%, and then 0.1 part of diethylhydroxylamine was added to terminate the polymerization reaction. Then, after distilling off unreacted monomers from the obtained copolymer latex under reduced pressure, the solid content concentration and pH were adjusted to obtain a ...

Embodiment 1

[0097] Preparation of composition for dip molding

[0098] In the latex of the carboxyl group-containing nitrile rubber (a) obtained in Production Example 1 of 232.5 parts (converted into carboxyl group-containing nitrile rubber (a) is 100 parts), the sulfur (crosslinked agent), 1 part of potassium oleate (fatty acid soap and / or resin acid soap), 0.5 part of zinc dibutyldithiocarbamate (crosslinking accelerator), 1.5 parts of zinc oxide (crosslinking assistant) , 1.5 parts of titanium oxide (pigment), after adding the aqueous dispersion of each compounding agent, adding potassium hydroxide aqueous solution, obtained the composition for dip molding (solid content concentration: 25% by weight) adjusted to pH 9.8 ).

[0099] Manufacture of Surface Treatment Dip Molded Products

[0100]The glove mold made of ceramics whose surface is rubbed is cleaned, preheated in an oven at 70° C., and prepared by 13% by weight of calcium nitrate and 0.05% by weight of polyoxyethylene laur...

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Abstract

Provided is a dip molded article obtained by dip molding a composition for dip molding comprising a latex of a carboxy-group-containing nitrile rubber. The dip molded article is characterized in that at least one surface thereof is subjected to a surface treatment, a film thickness is 0.02 to 0.2 mm, a coefficient of dynamic friction of the surface-treated surface is 0.5 or less, and a tensile strength after the surface treatment is 30 MPa or more.

Description

technical field [0001] The present invention relates to a dipped molded article, and more particularly, to a dipped molded article that has excellent wear-off properties due to a decrease in the dynamic friction coefficient due to surface treatment, and can suppress a decrease in tensile strength due to surface treatment to a low level And a method of manufacturing such a dip-molded article. Background technique [0002] Dip-molded products such as pacifiers, light balloons, gloves, balloons, covers, etc., which are dip-molded with a dip-molding composition containing natural latex typified by natural rubber latex and used in contact with the human body are known in the art. However, since natural rubber latex contains proteins that cause allergic symptoms to humans, it may be problematic as a dipped molded product that comes into direct contact with biological mucous membranes or organs. Therefore, studies using latexes of synthetic nitrile rubbers are ongoing. [0003] F...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/00B29C41/14C08J7/046
CPCB29C41/14C08J7/065C08J2309/02C08J7/126C08J7/14C08J2309/04C08J5/02C08J2313/02C08J7/046B05D1/18
Inventor 加藤慎二
Owner ZEON CORP
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