Powder rubber (mixture) and the method of production thereof

 

The invention relates to powder rubbers containing other components to obtain vulcanizate rubber compound and method of production thereof. Superfine rubber powder contains (a) a rubber matrix and optionally (b) one or more white and/or black fillers, optionally modified with one or more organosilicon compounds of formula (I), (II) or (III): [R1n(RO)3-nSi(Alk)m-(Ar)p]q[V] (I), R1n(RO)3-nSi(Alk) (II), or R1n(RO)3-nSi(alkenyl) (III), where In denotes-SCN, -SH, -Cl, -NH2(if q=1) or-Sx- (if q=2), R and R1denote a branched or unbranched alkyl group with 1-4 carbon atoms, phenyl residue, and all residues R and R1can have in each case identical or different meanings, and preferably they mean alkyl group, R denotes a branched or unbranched C1-C4alkyl, C1-C4alkoxygroup, n denotes 0, 1 or 2, Alk denotes a divalent linear or branched hydrocarbon residue with 1-6 carbon atoms, m represents 0 or 1, AG - Allenby residue with 6 to 12 C-atoms, R represents 0 or 1 when y is a saturated hydrocarbon residue with 1-20 carbon atoms, preferably 2-8 carbon atoms, alkenyl is a monovalent linear or branched unsaturated hydrocarbon residue with 2 to 20 carbon atoms, preferably 2-8 carbon atoms. To add rubber) one or more known additives to obtain a vulcanizate. Fillers add in two stages. The solid precipitate is separated by known methods. If necessary, washed and dried. The technical result consists in increasing the flowability and ease of processing rubber and mixtures and improve their properties, 2 c. and 13 C.p. f-crystals.

Description text in facsimile form (see graphic part).

Claims

1. Superfine rubber powder containing (a) a rubber matrix and optionally (b) one or more well-known white and/or black fillers, optionally modified with one or more organosilicon compounds of the formula (I), (II) or (III)

[R1n(RO)3-nSi(Alk)m-(Ar)p]q[In]; (I)

R1n(RO)3-nSi(Alk); (II)

or R1n(RO)3-nSi(alkenyl), (III)

where denotes the-SCN, -SH, -Cl, -NH2(if q=1) or-Sx- (if q=2);

R and R1denote razwell the>can have in each case identical or different meanings, and preferably they mean alkyl group;

R denotes a branched or unbranched1-C4alkyl, -C1-C4alkoxygroup;

n = 0, 1, or 2;

Alk denotes a divalent linear or branched hydrocarbon residue with 1-6 carbon atoms;

m = 0 or 1;

AG indicates Allenby residue with 6 to 12 C-atoms;

p = 0 or 1, provided that p and m do not simultaneously denote 0,

x = 2-8;

alkyl is a monovalent linear or branched unsaturated hydrocarbon residue with 1-20 carbon atoms, preferably 2-8 carbon atoms;

alkenyl represents a monovalent linear or branched unsaturated hydrocarbon residue with 2 to 20 carbon atoms, preferably 2-8 carbon atoms;

C) one or more known additives used in the preparation of rubber vulcanizates.

2. Rubber powder under item 1, characterized in that it contains one or more of the following additives in the conventional processing to a vulcanizate quantities: (a) zinc oxide and/or zinc stearate; (b) stearic acid; polyhydric alcohols; g) polyamine; d) resin, the wax is whether vulcanization; and do not necessarily sulfur, in particular, a modified surface-active agent, and the particle size of solids present in the rubber powder is preferably50 ám.

3. The method of obtaining fine rubber powders filled by deposition from aqueous mixtures containing optional modified organosilicon compounds superfine(s) filler(s), representing the carbon black and/or silica filler, a water-soluble salt of a metal of groups IIA, IIb, IIIa or VIII of the Periodic system of the elements and natural latex or aqueous emulsion of a rubber solution, optionally in the presence of an organic solvent in two stages, and a) in the first stage50 wt.%, but less than 100 wt.% envisaged number of fine filler, the total content of which in the rubber powder is from 20 to 250 wt.h. on 100 wt.h. rubber, preferably in the form of an aqueous suspension with a content of from 2 to 15 wt.% in water, optionally together with one or more provided for surface modification of filler organosilicon compounds of formula (I), (II) or (III), Okha is f">50 wt.%, but less than 100 wt.% at least partially modified on the surface by one or more organosilicon compounds of formula (I), (II) or (III) the filler is mixed primarily in the presence of the emulsifier with natural latex or aqueous emulsion of a rubber solution and reduce the pH of the mixture to a value ranging from 7.5 to 6.5; (b) in the second stage adds the residual part of the above-mentioned finely dispersed fillers, optionally together with intended for surface modification of filler residual amount of organosilicon compounds of formula (I), (II) or (III) in the form of a suspension, reduce the pH to a value in the range of less than 6.5 to about 5, resulting in a mixture of rubber completely precipitates together with a filler; C) after which the precipitated solid precipitate is separated by known methods; d) if necessary, wash and d) is dried.

4. The method according to p. 3, characterized in that in the first stage, reducing the pH of the mixture is carried out by adding a Lewis acid.

5. The method according to any of the preceding paragraphs, characterized in that in the second stage the pH of the mixture is reduced to values around 5.5.

6. The method according to any of the preceding paragraphs, characterized is that the number added in the form of a residual part of the second stage.

7. The method according to p. 6, characterized in that when the total content of filler80 parts per 100 parts of rubber, 10 to 20 parts of this quantity is added in the form of a residual part of the second stage.

8. The method according to any of the preceding paragraphs, characterized in that add carbon black with an average particle size of from 1 to 9 microns.

9. The method according to any of the preceding paragraphs, wherein the white filler, which represents a precipitated silicic acid, used at least partially in the form of fully washed from salt precipitate on the filter.

10. The method according to any of the preceding paragraphs, characterized in that before the deposition of the rubber powders in suspension/emulsion add the usual technological and/or vulcanizing additives specified in paragraph 2, subparagraphs (a)), provided that the particle size of the added solid components is <50 μm, preferably <10 μm.

11. The method according to p. 10, characterized in that the suspension of a filler containing one or more of the above-mentioned technological and/or vulcanizing additives before adding the rubber component is passed through the apparatus for grinding.

12. The method according to p. 10, characterized in that the suspension of the filler Ave the stage.

13. The method according to any of the preceding paragraphs, characterized in that one or more of the components identified in paragraph 2, subparagraphs (a)) is mixed with an emulsion latex, respectively, the rubber solution or suspension of the filler and then the thus obtained emulsion latex, respectively, the solution of rubber mix in the first stage with the thus obtained suspension of the filler.

14. The method according to any of the preceding paragraphs, characterized in that the accelerator (accelerator) vulcanization is mixed with rubber powder containing the above-mentioned additives (a-g), or suspended or dissolved in compatible with rubber oil and spray on rubber powder.

15. The method according to p. 14, characterized in that together with the vulcanization accelerator is additionally applied sulfur.

 

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