Modified butadiene copolymer latex with alkyl (meth) acrylate links

FIELD: chemistry.

SUBSTANCE: butadiene copolymer latex with methyl(meth)acrylate links or butylacrylate is modified by mixing the latex with 0.8-3.0 wt % polyethylenepolyamine in terms of dry latex after mixing latex and polyethylenepolyamine. A polyester cord is impregnated with the latex composition and bonding strength with SKI-3 based rubber is checked.

EFFECT: improved adhesion properties of latex for impregnating reinforcement textile materials.

1 tbl, 10 ex

 

The invention relates to the latexes used in impregnating compositions for fastening the reinforcing textile materials to rubbers in the manufacture of tires and other rubber products, and can be used in the synthetic rubber industry.

Known used for this purpose latex of copolymer of butadiene containing nitrile and amide groups (patent 2163914 Russia, IPC7C08L 19/02, 19.05.1998,) is a comparative example.

Closest to the invention by the technical nature of a latex of a copolymer of butadiene containing ester linkages, namely the alkyl(meth)acrylate (patent 2144927 Russia, IPC7C08F 236/14, 236/10, 236/12, 25.08.1998,) prototype. Adhesive properties of known latexes do not provide the level of bond strength cord, especially promising for passenger and light truck tires polyester, rubber materials that enhance the health of the tire carcass.

The aim of the invention is to improve adhesion properties of the latex for impregnation of a reinforcing textile materials.

This objective is achieved in that the latex of copolymer of butadiene with links alkyl(meth)acrylate modified by mixing with stirring from 0.8 to 3.0 mass % of polyethylenepolyamine (PEPA) calculated on dry substance of the latex. The inventive latex of copolymer of butadiene with links alkyl(m is t)acrylate differs it contains a polyethylenepolyamine, resulting a new technical effect of improving the adhesion properties with respect to textile Corda was that corresponds to the criterion of "inventive step".

The invention is illustrated by the following examples.

Example 1 (prototype). In the composition for impregnation polyester cord used latex butadiene copolymer containing units of butadiene and butyl acrylate in a ratio of 95:5, DB-1 on THE other 2294-347-05842324-98. The composition includes (parts by weight per 100 parts by weight of latex, counting on dry substance): 25 Novolac resorcinolformaldehyde resin SF-282 on THE 6-07-402-90, 6 formaldehyde as formalin technical GOST 1625-89, 0,5 caustic soda technical GOST 2263-79 and 15 ml of 25%ammonia water according to GOST standard 9-92 per 1 liter of composition.

Example 2 (comparative). In the composition for impregnation polyester cord used latex of copolymer of butadiene with nitrile and amide groups BSEARCH-52 with a ratio of butadiene: Acrylonitrile: methacrylamide 93:5:2 on THE other 2294-072-05766741-97. Prepare the composition of example 1.

Example 3. The latex of copolymer of butadiene and butyl acrylate in wt. the ratio of 95:5 modify the mixture under stirring with 1.5 wt.% PEPA, counting on 100 parts by weight of dry solids of the latex. The modified latex is used in the composition of example 1 for impregnation polyester cord.

Example 4. The latex from which alimera butadiene and butyl acrylate in wt. the ratio of 95:5 modify the mixture when mixed with 3 wt.% PEPA, counting on 100 parts by weight of dry solids of the latex. The modified latex is used in the composition of example 1 for impregnation polyester cord.

Example 5. The latex of copolymer of butadiene and butyl acrylate in wt. the ratio of 95:5 modify the mixture under stirring with 5 wt% of the probes, counting on 100 parts by weight of dry solids of the latex. The modified latex is used in the composition of example 1 for impregnation polyester cord.

Example 6. The latex of copolymer of butadiene and methyl methacrylate in wt. the ratio of 95:5 modify the mixture under stirring with 0.5 wt.% PEPA, counting on 100 parts by weight of dry solids of the latex. The modified latex is used in the composition of example 1 for impregnation polyester cord.

Example 7. The latex of copolymer of butadiene and methyl methacrylate in wt. the ratio of 95:5 modify the mixture under stirring with 0.8 wt.% PEPA, counting on 100 parts by weight of dry solids of the latex. The modified latex is used in the composition of example 1 for impregnation polyester cord.

Example 8. The latex of copolymer of butadiene and methyl methacrylate in wt. the ratio of 95:5 modify the mixture under stirring with 1.2 wt.% PEPA, counting on 100 parts by weight of dry solids of the latex. The modified latex is used in the composition of example 1 for impregnation polyester cord.

Primer. The latex of copolymer of butadiene and methyl methacrylate in wt. the ratio of 95:5 modify the mixture under stirring with 2.3 wt.% PEPA, counting on 100 parts by weight of dry solids of the latex. The modified latex is used in the composition of example 1 for impregnation polyester cord.

Example 10. The latex of copolymer of butadiene and methyl methacrylate in wt. the ratio of 95:5 modify the mixture under stirring with 3.5 wt.% PEPA, counting on 100 parts by weight of dry solids of the latex. The modified latex is used in the composition of example 1 for impregnation polyester cord.

The compositions according to examples 1-10 impregnated with polyester cord 18P airplanes on THE 6-13-53578992-80-2005, heated 4 min at a temperature of 125-135 mAC and 1 min at a temperature of 225-230C, then determine its strength with rubber-based SKI-3 and H-method according to GOST 23785-89.

The obtained data are given in the table.

From the table it is seen that the latexes of copolymers of butadiene with links alkyl(meth)acrylate, modified by mixing with stirring from 0.8 to 3 wt.% PEPA, considering dry matter, has improved adhesion properties compared to latex, do not contain this substance. They provide increased bond strength polyester cord to rubber in comparison with the prototype to 15% and in comparison with the previously known latex - up to 18%. The modification of the latex less of 0.8 wt.% and Bo is isim 3 wt.% the number of probes does not improve the bond strength.

Table
Effect modification of the latexes of copolymers of butadiene with alkyl(meth)acrylate polyethylenepolyamine (Pepa) the bond strength with rubber polyester fabric, impregnated with compositions on the basis of these latexes
ExampleThe latex of copolymer of butadiene with:The content of the probes in latex, counting on dry basis, wt.%The bond strength on the H-method, N, if:
nitrile groupsamide groupshard-essential parts (name)23C120C
1 (prototype)--butyl acrylate-10192
2 (comparative)--9889
3--butyl acrylate1,5104100
4--the same3113104
5--the same59287
6--methyl-methacrylate0,510294
7--the same0,811398
8--the same1.2116103
9 --the same2,3113101
10--the same3,59993

The latex of copolymer of butadiene with links methyl(meth)acrylate or butyl acrylate, characterized in that the latex modified mixed with 0.8 to 3.0 wt.% polyethylenepolyamine, counting on the dry matter.



 

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20 cl, 5 tbl, 12 ex

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2 cl, 5 tbl, 11 ex

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