SU852907A1 - Composition based on polychloroprene latex - Google Patents

Description

one

The invention relates to the rubber industry and concerns the development of a composition based on polychloroprene latex.

Known composition based. polychloroprene latex, including the stabilizer - neozon D l,

However, this cc |; "1 position does not provide the stability of the properties of latex during storage and simultaneous. improving the adhesive characteristics of the composition.

The purpose of the invention is to increase the stability of the properties of latex during storage and at the same time improve the adhesive characteristics of the composition.

The objective is achieved in that the composition based on polychloroprene latex, which includes the stabilizer, contains as the latter a chelate compound of monoethanolamine with an inorganic salt of copper sulfate or cobalt chloride, with a ratio of salt by weight 5-15: 1 in the amount of 1.02, 0 weight . h, per 100 weight, h, dry residue of latex.

According to the proposed technical solution to the aqueous emulsion of polychloroprene. Tairite latexes of the type

LNT-1 and L-14NT) after the end of the low-temperature polymerization process (10-20 ° C), chelating compounds of the amino alcohol monoethanolamine with copper sulfate (CuSO), or cobalt chloride () in the amount of 1.0-2.0 weight , h, per 100 weight, h, polymer. The ratio of amine and salt in the complex, respectively, is 5–15: 1 (weight, h). The introduction of these chelate compounds, in addition to stabilizing the properties of the obtained polychloroprene latexes, also leads to a noticeable increase in their adhesion properties. The following is a recipe for a polymerization mixture to produce LNT-1 type nitrite latex followed by the introduction of stabilizers based on monoethanolamine chelates, weight, h,:

Chloroprene 3.8-4.0

Rosin 5

Tertiary dodecyl 0, 4-0,5

mercaptan

25

NaOH (10%

0.5

solution)

Emulsifier E-30

(30% solution

pentadecylsul1, 8-2.0

fonat)

thirty

Hydrogen peroxide (, 25% solution) 0.1-0.15 Sodium sulfide 0.2-0.3 Potassium persulfate 0.5-0.6 Ammonia (20% solution). 0.5, Water 95-100

The polymerization process is carried out at 10-12 0. After the polymerization process is completed, an aqueous emulsion of a benzene solution of monoethiolamine cs copper sulfate (or cobalt chloride) in an amount of 1.0-2.0 weight, h is introduced into the latex. per 100 weight parts polymer

Examples 1-8. Specific 1 examples of the preparation of polyisopropyl latex are given in table. 1, which presents the colloid-chemical characteristics of the obtained latexes and the physicomechanical properties of films based on them (degree of crystallinity, strength of adhesive bond with reference to various materials, induction period of oxidation of polychloroprene under the influence of UV irradiation) in comparison with properties of latex LNT-1 , stabilized with toluene solution of Neozon D (phenyl-ft-naphthlamine).

Table 2 shows some of the colloidal chemical characteristics of polychloroprene latexes and their adhesive properties after three months of artificial aging.

The polymerization mixture to obtain polychloroprene latex L-14-NT with its subsequent stabilization with monoethanolamine chelates has the following composition, parts:

Chloroprene100

Rosin (or

disproportionately) 3.0-4.0

Diproxide NaOH (25% solution)

Emulsifier E-30, 30% solution (pentadicylsulfonate sodium) Potassium sulfate Sulfamide sodium Triethanolamine Water

After the polymerization process is completed at 15–20 ° C, an aqueous emulsion of a benzene solution of monoethanolamine with copper sulfate (or coxl chloride) in an amount of 1.0-2.0 wt. hours per 100 weight.h. polymer

A comparison of the data obtained shows that the introduction of monoethanolamine chelate compounds into a polychloroprene latex (such as LNT-1 or L-14-NT) provides sufficient colloidal stability of the system over time. Thus, the viscosity, surface tension, and sizes of globular particles practically do not undergo significant changes for more than 3 months. Moreover, the coagulum content for polychloroprene latexes obtained by the proposed method does not exceed 1.5-2%, and for LNT-1 latex (stabilized by Neozone D 2.5-3.0%.

From the table. 2 data also shows that the proposed polychloroprene latexes are noticeably superior in adhesive properties to LNT-1 nairite latex with a standard stabilizer, which leads to the structuring effect of chelates during the formation of an adhesive seam.

Table

Claims (1)

Invention Formula A composition based on polychloroprene latex, which includes a stabilizer, which, in order to increase the stability of the properties of the latex during storage and at the same time improve the adhesive characteristics of the composition, the latter contains as a stabilizer a chelate compound of monoethanolamine with an inorganic salt — sulfate copper or cobalt chloride when the ratio of amine and salt by weight of 5-15: 1 in the amount of 1.0-2.0 weight.h. per 100 weight parts dry residue latex. Sources of information taken into account in the examination of Badas and N.B., etc. Fundamentals of technology for the synthesis of chloroprene rubber. M., Himi, 1971, p. 139, (prototype).