Latex composition for dip molding, and molded product manufactured therefrom

A technology of dip molding and composition, applied to the latex composition used for dip molding, which can solve the physical properties of gloves (low tensile strength, elongation and modulus, long cross-linking aging of sulfur, glove denaturation, etc. problems, to achieve the effects of improved durability, improved syneresis, and good user experience

Active Publication Date: 2018-12-21
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In other words, the problem is that the smaller the modulus, the higher the wearing experience, but the lower the physical properties (tensile strength, elongation and modulus) of the glove itself
In addition, there is a problem that denaturation or tearing of the glove due to sweat occurs when the glove is worn for a long time
Also, crosslinking using sulfur requires longer aging

Method used

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  • Latex composition for dip molding, and molded product manufactured therefrom
  • Latex composition for dip molding, and molded product manufactured therefrom
  • Latex composition for dip molding, and molded product manufactured therefrom

Examples

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preparation example Construction

[0035] In the present invention, the preparation of the sodium polysulfide aqueous solution is not particularly limited, and can be prepared by methods known in the art. For example, the aqueous solution is prepared by dissolving sodium sulfide in distilled water to prepare a strongly alkaline aqueous solution, and then adding sulfur (S 8 ) powder [Macromol. Rapid Commun. 2015, 36, 1103-1107]. At this time, the concentration of the sodium polysulfide solution is preferably 5% by weight to 20% by weight in consideration of precipitation of sulfur in the aqueous solution.

[0036] This sodium polysulfide is used in an amount of 0.1 to 5 parts by weight, preferably 0.5 to 1 part by weight, relative to 100 parts by weight of the carboxylic acid-modified nitrile copolymer latex in terms of solid content. If the content of sodium polysulfide is less than the above-mentioned range, the above-mentioned effects cannot be ensured. On the contrary, if it exceeds the above range, synere...

Embodiment 1

[0091] Example 1: Preparation of Latex Compositions for Dip Molding and Dip Molded Articles

[0092] (Preparation of Carboxylic Acid Modified Nitrile Copolymer Latex)

[0093] A 10 L high pressure reactor equipped with a stirrer, thermometer, condenser and nitrogen inlet and configured for continuous addition of monomer, emulsifier and polymerization initiator was replaced with nitrogen. Thereafter, 2.5 parts by weight of alkane was added to the high pressure reactor with respect to 100 parts by weight of a monomer mixture of 25% by weight of acrylonitrile, 70% by weight of 1,4-butadiene and 5% by weight of methacrylic acid sodium benzenesulfonate, 0.5 parts by weight of t-dodecyl mercaptan, and 140 parts by weight of ion-exchanged water, and the temperature was raised to 48°C.

[0094] After raising the temperature, 0.25 parts by weight of potassium persulfate as a polymerization initiator was added. When the conversion rate reached 95%, the polymerization was terminated by...

Embodiment 2

[0103] Example 2: Preparation of Latex Compositions for Dip Molding and Dip Molded Articles

[0104] A latex composition for dip-molding was prepared in the same manner as in Example 1 except that hydrophilic sodium polysulfide was used in a proportion of 0.7 parts by weight, and a glove-shaped dip-molded article was prepared using it.

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Abstract

The present invention relates to a latex composition for dip molding, and a molded product manufactured therefrom and, more specifically, the composition uses sodium polysulfide having hydrophilicity,thereby enabling the manufacture of a deep molded product having slow syneresis, excellent tensile strength, elongation, and stress characteristics, and excellent sweat resistance, and feeling excellent when worn.

Description

technical field [0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2016-0116102 filed on Sep. 9, 2016, the entire contents of which are incorporated herein by reference. [0002] The present invention relates to a latex composition for dip molding, and a molded product prepared therefrom. The latex composition for dip molding can be used for preparing a vulcanizing agent by using sodium polysulfide having hydrophilic properties as a vulcanizing agent. Dip-molded articles with mild syneresis, excellent tensile strength, elongation and modulus properties, and excellent durability to perspiration. Background technique [0003] Disposable rubber gloves used in various daily life, such as housework, food industry, electronic industry, medical field, are made by dip molding of natural rubber or nitrile copolymer latex. In recent years, nitrile gloves have attracted attention in the disposable gloves market due to allergy to natural ru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/04C08K3/30C08J5/02C08J3/26C08F10/08C08F20/44C08F2/24B29C41/14A41D19/00
CPCB29C41/14C08K3/30A41D19/0062C08F236/06C08F2800/20C08F222/40C08F220/06C08F2/22C08F2/26C08F2/24C08L9/04C08J5/02C08J3/26C08F10/08C08F20/44A41D19/00C08L33/20C08L9/02C08L13/02C08F236/12B29C41/003B29K2033/20B29L2031/4864C08J2309/04C08K2003/3009
Inventor 赵源泰余承旭梁承勋韩政洙金智贤
Owner LG CHEM LTD
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