阅读说明：本技术 用于浸渍成型的胶乳组合物、该胶乳组合物的制备方法和由所述胶乳组合物成型的制品 (Latex composition for dip forming, method for preparing the same and articles formed from the same ) 是由 郑龙硕 权元相 金智贤 吴胜焕 于 2019-12-12 设计创作，主要内容包括：本发明涉及一种用于浸渍成型的胶乳组合物,更具体地,涉及一种用于浸渍成型的胶乳组合物、其制备方法和使用所述胶乳组合物制造的成型制品,所述用于浸渍成型的胶乳组合物包含：羧酸改性的腈类共聚物胶乳；和酚类乳化剂,其中,基于100重量份的所述羧酸改性的腈类共聚物胶乳,酚类乳化剂的含量(基于固体含量)为0.08重量份至6重量份。(The present invention relates to a latex composition for dip forming, and more particularly, to a latex composition for dip forming, which comprises: carboxylic acid-modified nitrile copolymer latex; and a phenolic emulsifier, wherein the content (based on the solid content) of the phenolic emulsifier is 0.08 to 6 parts by weight based on 100 parts by weight of the carboxylic acid-modified nitrile copolymer latex.)

1. A latex composition for dip forming comprising:

carboxylic acid-modified nitrile copolymer latex; and

a phenol-based emulsifier, which is a mixture of phenol-based emulsifiers,

wherein the content of the phenolic emulsifier (based on solid content) is 0.08 to 6 parts by weight based on 100 parts by weight of the carboxylic acid-modified nitrile copolymer latex.

2. The latex composition for dip forming according to claim 1, wherein the phenolic emulsifier is represented by the following formula 1,

[ formula 1]

In formula 1, R₁、R₂And R₃Each independently hydrogen, or a substituted or unsubstituted, linear or branched alkyl group having from 1 to 30 carbon atoms; r₁To R₃Is a substituted or unsubstituted, linear or branched alkyl group having 1 to 30 carbon atoms; r is hydrogen, a polymerizable functional group, an alkoxy group having 1 to 30 carbon atoms, an inorganic or organic salt, a nonionic group, or a halogen; m is an integer from 1 to 20; n is an integer from 1 to 100.

3. The latex composition for dip forming according to claim 2, wherein R₁、R₂And R₃Each independently hydrogen, or a substituted or unsubstituted, linear or branched alkyl group having 1 to 10 carbon atoms; r₁To R₃Is a substituted or unsubstituted, linear or branched alkyl group having 1 to 30 carbon atoms; r is hydrogen, a polymerizable functional group, an alkoxy group having 1 to 10 carbon atoms, an inorganic or organic salt, a nonionic group, or a halogen; m is an integer of 1 to 5; n is an integer of 8 to 25.

4. The latex composition for dip forming according to claim 2, wherein a substituent which may be substituted on the linear or branched alkyl group is selected from linear or branched alkyl groups having 1 to 30 carbon atoms; cycloalkyl having 3 to 30 carbon atoms; an aryl group having 6 to 30 carbon atoms; and a halogen.

5. The latex composition for dip forming according to claim 1, wherein the phenolic emulsifier is represented by the following formula 2,

[ formula 2]

In formula 2, R is hydrogen, a polymerizable functional group, an alkoxy group having 1 to 10 carbon atoms, an inorganic or organic salt, a nonionic group, or a halogen; n is an integer from 1 to 100.

6. The latex composition for dip forming according to claim 5, wherein the polymerizable functional group is selected from (meth) acrylate; alkyl (meth) acrylates having 1 to 30 carbon atoms; and alkenyl (meth) acrylates having 2 to 30 carbon atoms.

7. The latex composition for dip forming according to claim 1, wherein the content of the phenolic emulsifier (based on solid content) is 0.1 to 4 parts by weight based on 100 parts by weight of the carboxylic acid-modified nitrile copolymer latex.

8. The latex composition for dip forming according to claim 1, wherein the phenolic emulsifier has a number average molecular weight of 200 to 50,000 g/mol.

9. The latex composition for dip forming according to claim 1, further comprising an alkali-soluble emulsion thickener.

10. The latex composition for dip forming according to claim 9, wherein the alkali-soluble emulsion thickener is contained in an amount of 0.01 to 1.5 parts by weight (based on a solid content) based on 100 parts by weight of the carboxylic acid-modified nitrile copolymer latex.

11. The latex composition for dip forming according to claim 9, wherein the alkali-soluble emulsion thickener comprises a copolymer containing a repeating unit derived from an ethylenically unsaturated acid monomer and a repeating unit derived from an ethylenically unsaturated acid ester monomer.

12. A method for preparing a latex composition for dip forming, the method comprising:

a step (S10) of preparing a carboxylic acid-modified nitrile copolymer latex; and

a step (S20) of mixing the produced carboxylic acid-modified nitrile copolymer latex with a phenolic emulsifier,

wherein, in the step (S20), the phenolic emulsifier (based on solid content) is mixed in an amount of 0.08 to 6 parts by weight based on 100 parts by weight of the carboxylic acid-modified nitrile copolymer latex.

13. The preparation method of claim 12, wherein in the step (S20), an alkali-soluble emulsion thickener is further mixed.

14. A shaped article comprising: a layer from the latex composition for dip forming of any one of claims 1 to 11.

Technical Field

Cross Reference to Related Applications

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

Background

Disposable rubber gloves are increasingly used in various fields such as housekeeping, food industry, electronic industry and medical industry. In the past, disposable rubber gloves were made by dip molding natural rubber latex. However, disposable rubber gloves cause allergic reactions to proteins, such as pain or rash, to some users. Due to such problems, recently, disposable rubber gloves prepared by dip-molding nitrile latex instead of natural latex have received attention.

Recently, glove manufacturers who manufacture nitrile rubber gloves produced using nitrile latex are constantly trying to improve productivity and reduce defect rates. One of the methods of reducing the defect rate of gloves is a method of manufacturing gloves by double dip forming. However, when the double dip forming method is used, a syneresis phenomenon occurs in a product formed by the first dip forming, and thus, when the product formed by the first dip forming is subjected to the second dip forming, the stability of the latex is lowered. When the stability of the latex composition is low, coagulation (coagulation, flocculation, coagulation or coalescence) is generated to cause precipitation in the lower portion of the latex, and the coagulum adheres to the dip-formed article finally prepared, or pinholes are generated by coagulation, which increases the defect rate. Therefore, the tensile strength and elongation properties of the latex glove as a final product are reduced.

Meanwhile, one of the considerations of the user when using gloves is wearing comfort. However, in the case of nitrile rubber gloves, since the modulus is relatively high compared to gloves formed of natural rubber, the wearing comfort is not good.

Therefore, there is a need for a latex composition for dip molding that can solve the problem of syneresis during glove production and achieve wearing comfort of molded articles due to low modulus.

Disclosure of Invention

Technical problem

In order to solve the problems mentioned in the background art, it is an object of the present invention to increase a syneresis time, thereby improving stability of a latex composition for dip forming when dip forming is performed using the latex composition for dip forming, and maintaining physical properties of a dip-formed article such as gloves manufactured using the latex composition for dip forming at an equal or higher level.

That is, an object of the present invention is to provide a latex composition for dip forming, which is prepared by adding a phenolic emulsifier in the preparation of a carboxylic acid-modified nitrile copolymer latex composition to achieve an increase in syneresis time, to improve the stability of the latex composition for dip forming when dip forming is performed, and to improve the tensile strength of dip formed articles such as gloves manufactured using the latex composition for dip forming, and to achieve a low modulus to improve the wearing comfort of the dip formed articles, a method for manufacturing the latex composition, and a dip formed article manufactured using the latex composition.

Technical scheme

In one general aspect, there is provided a latex composition for dip forming, comprising: carboxylic acid-modified nitrile copolymer latex; and a phenolic emulsifier, wherein the content of the phenolic emulsifier is 0.08 to 6 parts by weight (based on the solid content) based on 100 parts by weight of the carboxylic acid-modified nitrile copolymer latex.

In another general aspect, there is provided a method for preparing a latex composition for dip forming, the method comprising: a step (S10) of preparing a carboxylic acid-modified nitrile copolymer latex; and a step (S20) of mixing the prepared carboxylic acid-modified nitrile copolymer latex with a phenolic emulsifier, wherein, in the step (S20), the phenolic emulsifier is mixed in an amount of 0.08 to 6 parts by weight based on 100 parts by weight of the carboxylic acid-modified nitrile copolymer latex.

In yet another general aspect, there is provided a shaped article comprising: a layer from a latex composition for dip forming.

Advantageous effects

According to the present invention, since the latex composition for dip molding has improved stability due to an increase in syneresis time, in the case of manufacturing a dip molded article such as a glove using the latex composition for dip molding, it is possible to achieve excellent handleability of the dip molded article, excellent tensile strength, and improved wearing comfort of the dip molded article due to low modulus.

Detailed Description