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Composition for dip forming and dip-formed molding

A technology of dip molding and composition, applied in the direction of coating, can solve problems such as poor bending fatigue resistance and cracking, and achieve the effects of low surface resistivity, excellent tensile strength and bending fatigue resistance, and excellent hand feel

Inactive Publication Date: 2007-10-31
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although this rubber glove has excellent hand feeling and sufficient tensile strength, it has the following problems: the problem of coloring caused by exposure to high temperature during manufacture; Problems of cracking and poor bending fatigue resistance

Method used

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  • Composition for dip forming and dip-formed molding
  • Composition for dip forming and dip-formed molding
  • Composition for dip forming and dip-formed molding

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0087] The preparation method of the composition of the present invention is: dispersing the organic peroxide in the water medium in the presence of the surfactant and the water-soluble polymer to prepare the dispersion liquid, adding and mixing it in the conjugated diene rubber latex. This dispersion liquid is preferably added to the conjugated diene rubber latex in a stirred state.

[0088] In addition, when the composition of the present invention contains the above-mentioned quaternary ammonium salt, the method for preparing the composition of the present invention is preferably a method of adding and mixing an aqueous solution of a quaternary ammonium salt to a conjugated diene rubber latex to prepare a latex to which a quaternary ammonium salt is added. In addition, use surfactant and / or polymer protective colloid to disperse organic peroxide in water medium to prepare organic peroxide dispersion water, add and mix above-mentioned organic peroxide dispersion water in the ...

Embodiment

[0118] Hereafter, although an Example and a comparative example are given and this invention is demonstrated more concretely, this invention is not limited to these Examples. In addition, unless otherwise specified, the parts in these examples are based on weight. The test and evaluation are as follows.

[0119] (1) Gel increase rate

[0120] A sample cut out to an approximately 5 mm square from the obtained rubber glove was precisely weighed. This was placed in an 80-mesh JIS standard sieve, and immersed in 80 ml of methyl ethyl ketone (MEK) for 24 hours. The sieve was removed from the MEK, air dried for 1 hour and then dried at 105°C for 1 hour. The gel was weighed again with a sieve, and the ratio (% by weight) to the original sample was determined from the weight of the gel portion held on the sieve, and it was defined as the gel content. Next, this value was compared with the value in Comparative Example 1 (when no organic peroxide was added) to obtain the rate of inc...

preparation example 1

[0133] (preparation example 1: the preparation of carboxyl modified NBR latex)

[0134]Add 28 parts of acrylonitrile, 66 parts of 1,3-butadiene, 6 parts of methacrylic acid, 0.3 parts of tert-dodecyl mercaptan, 132 parts of ion-exchanged water, dodecylbenzenesulfonic acid 3 parts of sodium, 0.5 part of β-naphthalenesulfonic acid formaldehyde condensate sodium salt, 0.3 part of potassium persulfate, and 0.05 part of sodium ethylenediaminetetraacetate. The polymerization temperature was maintained at 37°C to start polymerization.

[0135] When the polymerization conversion rate reaches 60%, add 0.15 parts of tert-dodecyl mercaptan, and the polymerization temperature is raised to 40° C., then, when the polymerization conversion rate reaches 80%, add 0.15 parts of tert-dodecyl mercaptan to continue polymerization reaction until the polymerization conversion rate reaches 94%. Then, 0.1 part of sodium dimethyldithiocarbamate was added as a polymerization terminator to terminate the...

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Abstract

A composition for dip forming which can give a dip-formed molding which has a satisfactory texture, is excellent in tensile strength and flexural fatigue resistance, and is less apt to color even when worn and used in working for long. The composition for dip forming is obtained by converting an organic peroxide which is solid at ordinary pressure and 30 DEG C to an aqueous dispersion in the presence of a surfactant and a polymeric protective colloid, adding the dispersion to a conjugated diene rubber latex, and aging the mixture. The organic peroxide preferably is dibenzoyl peroxide or dilauroyl peroxide.

Description

technical field [0001] The present invention relates to a dip-molding composition and a dip-molded article for producing rubber gloves, etc., and more specifically, to a dip-molding composition and the dip-molding article for providing a dip-molded article having high tensile strength and high bending fatigue resistance. Dip moldings. In addition, it relates to a composition for dip molding that has a low surface resistivity, is excellent in touch, and is not easily colored even if it is worn for a long time for work, and the dip molded article. Background technique [0002] Rubber gloves are widely used in housekeeping, food-related industries, precision industries, and medical treatment. The requirements for rubber gloves are: expand and contract with the movement of fingers, feel better (300% tensile stress is small, elongation is large), so that the hands will not be tired even if worn for a long time; Tensile strength); even if the operation is in contact with oil, it...

Claims

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Application Information

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IPC IPC(8): C08L9/10C08J5/02C08K5/14C08K9/04B29C41/14
Inventor 儿玉和美
Owner ZEON CORP
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