Chloroprene copolymer latex composition and molded product thereof
There is provided a chloroprene copolymer latex composition capable of obtaining a molded product having excellent mechanical properties and flexibility even when vulcanized and molded under milder conditions than before. A chloroprene copolymer latex composition contains a chloroprene copolymer latex (A), a metal oxide (B), a vulcanization accelerator (C), and an antioxidant (D). The chloroprene copolymer latex (A) is a latex containing particles of a chloroprene copolymer which is a copolymer of chloroprene (A-1), 2,3-dichloro-1,3-butadiene (A-2), and sulfur (A-3). The content of the sulfur (A-3) in the chloroprene copolymer is 0.1 part by mass or more and 1.0 part by mass or less when the total amount of the chloroprene (A-1) and the 2,3-dichloro-1,3-butadiene (A-2) is set to 100 parts by mass.
1. A chloroprene copolymer latex composition comprising:
a chloroprene copolymer latex (A), a metal oxide (B), a vulcanization accelerator (C), and an antioxidant (D), wherein
the chloroprene copolymer latex (A) is a latex containing particles of a chloroprene copolymer which is a copolymer of chloroprene (A-1), 2,3-dichloro-1,3-butadiene (A-2), and sulfur (A-3),
a content of the sulfur (A-3) in the chloroprene copolymer is 0.1 part by mass or more and 1.0 part by mass or less when a total amount of the chloroprene (A-1) and the 2,3-dichloro-1,3-butadiene (A-2) is set to 100 parts by mass, and
a content of a tetrahydrofuran insoluble content in the chloroprene copolymer is 50% by mass or more and 85% by mass or less.
2. The chloroprene copolymer latex composition according to claim 1 , wherein
a copolymerization ratio of the chloroprene (A-1) is 76% by mass or more and 93% by mass or less and a copolymerization ratio of the 2,3-dichloro-1,3-butadiene (A-2) is 24% by mass or less and 7% by mass or more when the total amount of the chloroprene (A-1) and the 2,3-dichloro-1,3-butadiene (A-2) is set to 100% by mass.
3. The chloroprene copolymer latex composition according to claim 1 , wherein
when an amount of a solid content in the chloroprene copolymer latex (A) is set to 100 parts by mass, an amount of the metal oxide (B) is 1 part by mass or more and 10 parts by mass or less, an amount of the vulcanization accelerator (C) is 0.1 part by mass or more and 5 parts by mass or less, and an amount of the antioxidant (D) is 0.1 part by mass or more and 5 parts by mass or less.
4. A molded product, which is the chloroprene copolymer latex composition according to claim 1 , wherein
a 300% modulus of elasticity is 0.5 MPa or more and 1.6 MPa or less, a tensile strength is 18 MPa or more, and a tensile elongation at break is 800% or more.
5. The molded product according to claim 4 , which is a dipped product.
6. The molded product according to claim 5 , which is a glove.
7. The molded product according to claim 5 , which is a medical disposable glove.
8. The chloroprene copolymer latex composition according to claim 2 , wherein
when an amount of a solid content in the chloroprene copolymer latex (A) is set to 100 parts by mass, an amount of the metal oxide (B) is 1 part by mass or more and 10 parts by mass or less, an amount of the vulcanization accelerator (C) is 0.1 part by mass or more and 5 parts by mass or less, and an amount of the antioxidant (D) is 0.1 part by mass or more and 5 parts by mass or less.
9. A molded product, which is the chloroprene copolymer latex composition according to claim 2 , wherein
a 300% modulus of elasticity is 0.5 MPa or more and 1.6 MPa or less, a tensile strength is 18 MPa or more, and a tensile elongation at break is 800% or more.
10. A molded product, which is the chloroprene copolymer latex composition according to claim 3 , wherein
a 300% modulus of elasticity is 0.5 MPa or more and 1.6 MPa or less, a tensile strength is 18 MPa or more, and a tensile elongation at break is 800% or more.
11. The chloroprene copolymer latex composition according to claim 1 , wherein particles of the chloroprene copolymer are dispersed in water.
12. A method of producing a chloroprene copolymer latex composition comprising:
adding chloroprene (A-1), 2,3-dichloro-1,3-butadiene (A-2) and sulfur (A-3) to obtain chloroprene copolymer latex (A) containing particles of a chloroprene copolymer, and
stirring the chloroprene copolymer latex (A), a metal oxide (B), a vulcanization accelerator (C), and an antioxidant (D) to obtain the chloroprene copolymer latex composition,
wherein a content of a tetrahydrofuran insoluble content in the chloroprene copolymer is 50% by mass or more and 85% by mass or less, and
wherein a content of the sulfur (A-3) in the chloroprene copolymer is 0.1 part by mass or more and 1.0 part by mass or less when a total amount of the chloroprene (A-1) and the 2,3-dichloro-1,3-butadiene (A-2) is set to 100 parts by mass.
13. The method according to claim 12 , wherein particles of the chloroprene copolymer are dispersed in water.
14. The method according to claim 12 , wherein chloroprene (A-1), 2,3-dichloro-1,3-butadiene (A-2) and sulfur (A-3) are added at a same time.