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Polychloroprene latex and manufacturing method thereof, and aqueous binding material

A technology of polychloroprene and chloroprene, which is applied in the direction of chloroprene adhesives, adhesives, adhesive types, etc., can solve problems such as poor bonding, and achieve improved water resistance and excellent water resistance. Indirect effect

Active Publication Date: 2013-01-30
DENKA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when these water-based adhesives are dry, polyvinyl alcohol may ooze out from the surface of the adhesive layer, and when used in a place with high humidity or where it is easily wetted by water, it may cause poor adhesion.

Method used

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  • Polychloroprene latex and manufacturing method thereof, and aqueous binding material
  • Polychloroprene latex and manufacturing method thereof, and aqueous binding material
  • Polychloroprene latex and manufacturing method thereof, and aqueous binding material

Examples

Experimental program
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Effect test

no. 1 Embodiment approach

[0038] First, the polychloroprene latex according to the first embodiment of the present invention will be described. The polychloroprene latex of the present embodiment is obtained by emulsifying a polymer of 2-chloro-1,3-butadiene (hereinafter referred to as chloroprene.) with polyvinyl alcohol (hereinafter also referred to as PVA). The resulting latex (emulsion).

[0039] Furthermore, the polychloroprene latex of the present embodiment is obtained by radical emulsion polymerization of chloroprene alone or chloroprene and other monomers in water using PVA having a carboxyl group in the molecule as an emulsifier.

[0040] Chloroprene polymer

[0041] The chloroprene polymer contained in the chloroprene latex of this embodiment is a homopolymer of chloroprene or a copolymer of chloroprene and another monomer. Here, examples of other monomers that can be copolymerized with chloroprene include 2,3-dichloro-1,3-butadiene, 1-chloro-1,3-butadiene, sulfur, methyl Acrylic acid a...

no. 2 Embodiment approach

[0084] Next, a water-based adhesive according to a second embodiment of the present invention will be described. The water-based adhesive of the present embodiment contains the polychloroprene latex of the first embodiment described above as a main component.

[0085] In the water-based adhesive of this embodiment, depending on the application and required performance, in addition to polychloroprene latex, metal oxides, tackifying resins, thickeners, vulcanization accelerators, fillers (reinforcing agents, etc.) ), pigments, colorants, antioxidants, ultraviolet absorbers, fungicides, preservatives, antibacterial agents, plasticizers, pH regulators, defoamers, rust inhibitors, polymer latex other than polychloroprene Wait. In addition, it is also possible to combine a curing agent to make a two-component adhesive.

[0086] Specific examples of metal oxides include zinc oxide (zinc oxide), magnesium oxide, and the like. When the viscosity of the latex is high, the metal oxide...

Embodiment

[0100] Hereinafter, the effects of the present invention will be concretely described with reference to examples and comparative examples of the present invention. In this example, PVA-(A)-(E) having a carboxyl group in the molecule and general-purpose PVA-(F)-(I) not having a carboxyl group were produced. Next, emulsion polymerization of polychloroprene was performed using each of the PVAs of Examples and Comparative Examples as an emulsifier, and an adhesive was prepared by blending tackifying resin and the like into the obtained PVA emulsified polychloroprene latex. , to evaluate its adhesion.

[0101] Manufacture of PVA-(A)

[0102] 175 g of vinyl acetate, 780 g of methanol, 1.0 g of acetic acid and 0.83 g of azobisisobutyronitrile were added to a reactor equipped with a reflux condenser, and the inside of the reactor was replaced with nitrogen and then heated to the boiling point. Thereafter, in the reactor, a mixed solution of 2100 g of vinyl acetate, 445 g of methan...

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Abstract

The invention provides polyvinyl alcohol emulsification polychloroprene latex which has excellent water resistance and is suitable for an aqueous binding material having high wter-resistant binding force and a manufacturing method thereof, and an aqueous binding material. At the presence of polyving akohol a molecule of which has a carboxyl group, chloroprene independently carries out emulsion polymerization or chloroprene and other monomers carry out emulsion polymerization to prepare chloroprene latex. A curing agent and metal oxide are mixed in the chloroprene latex to form the aqueous binding material.

Description

technical field [0001] The present invention relates to a polychloroprene latex, a method for producing the same, and an aqueous adhesive using the polychloroprene latex. More specifically, it relates to a technique for improving the quality of polychloroprene latex produced by an emulsion polymerization method. Background technique [0002] Polychloroprene latex (PVA emulsified polychloroprene latex) using polyvinyl alcohol as an emulsifier is characterized by excellent compatibility with various ingredients such as tackifying resin emulsions and thickeners, The degree of freedom in compounding design is high, and the viscosity after coating on various adherends is excellent. PVA emulsified polychloroprene latex can be used in water-based adhesives for bonding wood such as plywood and foam insulation to concrete by making effective use of these characteristics. [0003] However, when these water-based adhesives dry, polyvinyl alcohol may bleed out from the surface of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F136/18C08F236/18C08F2/24C09J111/02
Inventor 砂田洁大势元博
Owner DENKA CO LTD