CS268579B1 - Process for preparing terpolymer ethyl acrylate-methyl methacrylate-acrylonitrile water dispersion - Google Patents

Abstract

The purpose of the method for preparing a terpolymer ethyl acrylate-methyl methacrylate-acrylonitrile aqueous dispersion by emulsion copolymerization is to prepare a stable) polymer dispersion and to improve the control of the polymerization process. The stated purpose is achieved by using 1.3 to 2.7 parts by weight of sodium 14-Lp-(1-nonyl)phenyloxy-3,6,9- -12-tetraoxatetradecanyl sulfate of formula I. based on 100 parts by weight of water. The method for preparing a terpolymer ethyl acrylate-methyl methacrylate-acrylonitrile aqueous dispersion by emulsion copolymerization is also useful in formulating new processes for preparing coating and impregnation products.

Description

CS 268579 1)]

The invention! i n t of spAsotion of adulteration li; ι · ρο I ymi! The present invention also relates to ink-containing water dispersions.

Polymeric aqueous dispersions prepared by emulsion copolymerization of vinyl monomers with different solubility in water mail Wide industrial uses and have been the subject of many Studies c I · Čapek, 3. Bartoň: Makromoi. Chem. 1B6, 1297 (1985); 3. Guillot, Acta Polymerica 32, 593 (1901) 3. Polymer dispersion acrylate monomers of different hydrophobicity have often been prepared. The disadvantage of the emuizable copolymerization of tyclitomonomers is that they have a low stability polymer latex, with increased coagulation potential, low viscosity and low solid polymeric substrate content. lower stability even at higher emulsifier concentrations (sodium dodecylphenoxybenzene disulfonic acid, sodium stearate, sodium alkyl sulfonate (Cl · Capek, 3rd Barton, E.Orolinova: Acta Polymerica 36, 107 (1985), 3 Guillot, Acta Polymerica) 32, 593 (1981), 0. K. Svecov, TD Zhukov, BF UstabSchikov, IH Kanevski, N. Petuchov, Acta Polymerica 32, 403 (1981)].

The above disadvantages are substantially eliminated by the process for the preparation of terpolymer ethyl acrylate-methacrylate-acrylonitrile aqueous dispersion, which comprises adding 1.3 to 2.7 parts by weight of sodium-14-β- (1 -nonyl) phenyloxyl-3,6,9,12-tetraoxatetra-decane sulphate of the formula c9H19-N2H (O-CH2-CH2) 5-O-SO3, loaded on 100 parts by weight of water. The advantage of the proposed process for the preparation of the terpolymer ethyl acrylate-methyl methacrylate-acrylate onitrile aqueous dispersion is that there is greater stability of the copolymer water dispersion and the copolymerization rate. Example 1

50 g of distilled water, 245 g of ethyl acrylate, 31.6 g of methyl methacrylate, 30.4 g of acrylonitrile and 1 are introduced into a three-neck reaction flask equipped with a stirrer, a combustion condenser, a nitrogen inlet and a device for continuous sampling of the aqueous dispersion. 3 parts by weight of sodium-14 - (j - (1-nonylamino) -phenyl) -2,3,6,9,12-tetroxa-tetramate-1-sulfate (Etoxon AF-5). 0.6 Ammonium persulfate is added by stirring at 400 rpm and 60 ° C. Every 10 minutes, 1 ml of an aqueous dispersion (to isolate the polymer to determine the conversion) is taken during the polymerization, and the polymer is isolated from the aqueous dispersion so that the dispersion coagulates in 50 ml of methanol acidified to pH 2 with acetic acid. The obtained polyphene is crushed into a granular form and washed with 100 ml of water and 100 ml of methanol and allowed to dry at 50 ° C for 5 days. Interval Interval (I. Čapek, 3. Bartoň, E.Orolínová, Chemická Zvěsti 38, 803 (1984)). After the polymerization of the monomer, the final aqueous dispersion is filtered and the polymeric coagulum obtained is washed with 100 ml of water and 100 ml of methanol. The coagulum obtained is dried for 5 days at 50 ° C. The polymerization rate is 2.2 zie conversion per minute to obtain 5 g of polymer coagulum.

Example 2

The procedure is as in Example 1, except that 2 parts by weight of sodium 1,4-Cp- (1-nonyl) phenyloxy} -3,6,9,12-tetraoxatetradecanyl sulfate per 100 parts by weight of water are used. The polymerization rate is 2.6 per minute per minute and 2 g of the coagulated polymer is obtained.

Claims (1)

EXAMPLE 3 The procedure is as in Example 1 except that it is used as an emulsifier of 2.7 parts by weight of sodium 1α-Cp- (1-nonyl) phenyloxypin-6,6,9,12-tetraoxatecradecanyl sulfate based on 100 parts by weight of water. The polymerization rate is 3.1 conversions per minute and no coagulum is obtained. For comparison, the effect of tri-14-β- (1-nonylamino) phenyloxy} -3,6,9, 12-tetraoxa tetradecanyl sulfate with some previously used emulsifier, i.e. tri-17-octadecene-1-sulfonic acid -tom, the following example of Cl.Kapek, J. Barton, V. Svoboda, V. Novotny, LQ Tuan, Makromol. Chem. 1B8, 1723 (1987) 3: Example A The procedure was as in Example 1 except that the 3-weight emulsion-17-octadecene-1-sulfonate (Spolapon AOS), 240 g of ethyl acrylate and 1-10 g of methyl methacrylate were used as emulsifiers. The polymerization rate is 3 t of conversion per minute to obtain 3 g of coagulum. The invention can find use in the chemistry of polymer dispersions! in formulating new types of stable latex formulations. EMBODIMENT A process for the preparation of terpolymer ethyl acrylate-methyl methacrylate-acrylonitrile water dispersion by emulsion copolymerization of ethyl acrylate, methyl methacrylate and acrylonitrile by coupling ammonium persulfate, characterized by the addition of 1.3 to 2.7 weight percent-14Ep (1-nonyl) phenyloxy-3,6,9,12-tetraoxatetradecanyl sulphate of formula based on 100 parts by weight of water.