阅读说明：本技术 羧酸改性的腈类共聚物胶乳组合物、包含它的用于浸渍模塑的胶乳组合物和它的模制品 (Carboxylic acid-modified nitrile copolymer latex composition, latex composition for dip molding comprising the same, and molded article thereof ) 是由 金廷垠 金智贤 余承旭 于 2019-11-01 设计创作，主要内容包括：本发明提供一种羧酸改性的腈类共聚物胶乳组合物。更具体地,本发明提供一种包含羧酸改性的腈类共聚物的羧酸改性的腈类共聚物胶乳组合物、包含它的用于浸渍模塑的胶乳组合物和它的模制品,其中,所述羧酸改性的腈类共聚物包含来自(甲基)丙烯酸羧基烷基酯单体的重复单元和来自包括磺酸盐或磺酸酯的烯属不饱和磺酸单体的重复单元。(The present invention provides a carboxylic acid-modified nitrile copolymer latex composition. More specifically, the present invention provides a carboxylic acid-modified nitrile copolymer latex composition comprising a carboxylic acid-modified nitrile copolymer, wherein the carboxylic acid-modified nitrile copolymer comprises a repeating unit from a carboxyalkyl (meth) acrylate monomer and a repeating unit from an ethylenically unsaturated sulfonic acid monomer including a sulfonate or sulfonic acid ester, a latex composition for dip molding comprising the same, and a molded article thereof.)

1. A carboxylic acid-modified nitrile copolymer latex composition comprising: carboxylic acid-modified nitrile copolymers of, among others,

the carboxylic acid-modified nitrile copolymer comprises repeat units from a carboxyalkyl (meth) acrylate monomer and repeat units from an ethylenically unsaturated sulfonic acid monomer including a sulfonate or sulfonic acid ester.

2. The carboxylic acid-modified nitrile copolymer latex composition of claim 1, wherein the carboxyalkyl (meth) acrylate monomer is one or more selected from the group consisting of carboxyethyl (meth) acrylate, carboxypropyl (meth) acrylate, and carboxypentyl (meth) acrylate.

3. The carboxylic acid-modified nitrile copolymer latex composition of claim 1, wherein the ethylenically unsaturated sulfonic acid monomer is one or more selected from the group consisting of sodium vinyl sulfonate, (meth) sodium allyl sulfonate, 2-methyl-2-propene-1-sulfonic acid sodium salt, 2-acrylamido-2-methylpropane sulfonic acid sodium salt, 3-sulfopropyl (meth) acrylate, sodium alpha-methyl styrene sulfonate, sodium ethyl styrene sulfonate, and sodium 1-allyloxy-2-hydroxypropyl sulfonate.

4. The carboxylic acid-modified nitrile copolymer latex composition according to claim 1, wherein the content of the repeating unit from the carboxyalkyl (meth) acrylate monomer is 0.1 to 10% by weight based on the total content of the carboxylic acid-modified nitrile copolymer, and the content of the repeating unit from the ethylenically unsaturated sulfonic acid monomer is 0.1 to 10% by weight based on the total content of the carboxylic acid-modified nitrile copolymer.

5. The carboxylic acid-modified nitrile copolymer latex composition of claim 1, wherein the content of the repeating unit from the carboxyalkyl (meth) acrylate monomer is 2 to 6 wt% based on the total content of the carboxylic acid-modified nitrile copolymer and the content of the repeating unit from the ethylenically unsaturated sulfonic acid monomer is 2 to 5 wt% based on the total content of the carboxylic acid-modified nitrile copolymer.

6. The carboxylic acid-modified nitrile copolymer latex composition according to claim 1, wherein the repeating unit derived from an ethylenically unsaturated sulfonic acid monomer and the repeating unit derived from a carboxyalkyl (meth) acrylate monomer are contained in a weight ratio of 1:1 to 5.

7. The carboxylic acid-modified nitrile copolymer latex composition of claim 1, wherein the carboxylic acid-modified nitrile copolymer comprises: repeating units derived from conjugated diene monomers, repeating units derived from ethylenically unsaturated nitrile monomers, repeating units derived from ethylenically unsaturated acid monomers, repeating units derived from carboxyalkyl (meth) acrylate monomers, and repeating units derived from ethylenically unsaturated sulfonic acid monomers.

8. The carboxylic acid-modified nitrile copolymer latex composition of claim 1, wherein the carboxylic acid-modified nitrile copolymer comprises: 40 to 80% by weight of repeating units derived from a conjugated diene monomer; 10 to 50% by weight of repeating units from ethylenically unsaturated nitrile monomers; 0.1 to 10% by weight of recurring units derived from an ethylenically unsaturated acid monomer; 0.1 to 10 wt% of repeating units derived from a carboxyalkyl (meth) acrylate monomer; and 0.1 to 10 weight percent of repeating units derived from ethylenically unsaturated sulfonic acid monomers.

9. A latex composition for dip molding, the latex composition comprising: the carboxylic acid-modified nitrile copolymer latex composition according to any one of claims 1 to 8; and a crosslinker composition.

10. The latex composition for dip molding according to claim 9, wherein the crosslinker composition comprises zinc oxide, a vulcanizing agent, and a vulcanization accelerator.

11. A molded article, comprising: a layer from the latex composition for dip molding of claim 9.

Technical Field

Cross Reference to Related Applications

This application claims the benefit of priority from korean patent application No. 10-2018-.

Background

In general, natural rubber has been mainly used as a raw material for products requiring elasticity, such as industrial, medical, and food gloves, balloons, and condoms. However, in recent years, natural rubber has been replaced with nitrile rubber because it causes severe protein allergy in some users to cause side effects. Since nitrile rubber has high oil resistance, it is widely used for work gloves used by users who handle organic solvents, or medical and food gloves. Further, since products made of nitrile rubber have properties such that they are less likely to be pierced by an injection needle than products made of natural rubber, they are suitable for medical staff handling sharp scalpels, injection needles, and the like.

In addition, in recent years, in many glove manufacturing enterprises, production lines have been shifted from natural rubber glove production lines to nitrile rubber glove production lines due to unstable supply and demand of natural rubber, and use of disposable gloves made of nitrile rubber has continued to increase with increased safety awareness.

In accordance with this trend, glove manufacturing companies aim to manufacture gloves that are thin but are not easily torn in order to increase productivity of gloves, and for this reason, there is a need for a latex for dip molding that can manufacture gloves exhibiting high tensile strength. In the manufacture of gloves, as one of the largest factors affecting tensile strength, it can be proposed that an ionic bond is generated between methacrylic acid, which is one of monomers used in the preparation of a latex for dip molding, and zinc ions of zinc oxide added to the latex composition for dip molding. The tensile strength of the glove is determined by how many ionic bonds are formed.

Meanwhile, in order to improve physical properties of gloves such as tensile strength and durability, it is necessary to increase the speed of a film forming process in a glove manufacturing process, and when the speed is increased, processability in the glove manufacturing process is deteriorated. Specifically, syneresis, which is one of physical properties represented by processability, is a phenomenon in which particles in latex aggregate to cause dehydration, and when a film forming speed is increased in a glove manufacturing process, the syneresis speed is also increased. When the syneresis speed is too fast, the latex stability of the latex composition for dip molding is lowered to generate aggregates, which causes glove defects. Further, when the workability is not good, a latex flowing shape (flow mark) occurs on the glove, or the glove has a lump, so that the appearance of the glove is deteriorated.

Disclosure of Invention

Technical problem

In order to solve the problems mentioned in the background art, the problem to be solved in the present invention is to increase the tensile strength of a dip-molded article manufactured by dip molding to reduce the modulus at 300%, thereby improving the wearing feeling, and at the same time, improving the workability.

That is, an object of the present invention is to provide a carboxylic acid-modified nitrile copolymer latex composition for manufacturing a dip-molded article, a latex composition for dip molding comprising the same, and a dip-molded article thereof, in which, in manufacturing a dip-molded article such as a glove using the latex composition for dip molding, the modulus at 300% is low while the processability is improved, so that the wearing feeling of the glove is excellent, and the tensile strength is high, and therefore, even a thin glove is not easily torn.

Technical scheme

In one general aspect, there is provided a carboxylic acid modified nitrile copolymer latex composition comprising: a carboxylic acid-modified nitrile copolymer, wherein the carboxylic acid-modified nitrile copolymer comprises repeating units derived from a carboxyalkyl (meth) acrylate monomer and repeating units derived from an ethylenically unsaturated sulfonic acid monomer including a sulfonate salt or ester.

In another general aspect, there is provided a latex composition for dip molding, comprising: the carboxylic acid-modified nitrile copolymer latex composition; and a crosslinker composition.

In yet another general aspect, there is provided a molded article comprising a layer from the latex composition for dip molding.

Advantageous effects

The latex composition for dip molding comprising the carboxylic acid-modified nitrile copolymer latex composition according to the present invention increases the bonding force with zinc oxide, and thus, when dip molded articles such as gloves are manufactured using the latex composition for dip molding, the manufactured dip molded articles have improved tensile strength and improved wearing feeling due to a decrease in modulus at 300%, while processability is improved.

Detailed Description