Mixtures containing an aminically crosslinkable rubber and polyethyleneimine
The invention relates to mixtures containing at least one aminically crosslinkable rubber and a cross-linking system, which consists of at least one crosslinker and optionally at least one vulcanization accelerator, the at least one crosslinker containing polyethylene imine. The invention further relates to the production and to the use of said mixtures; and to the vulcanized products that can be obtained from the mixture, in particular in the form of rubber articles, in particular seals, hoses, membranes and o-rings.
1 . A mixture comprising
at least one aminically crosslinkable rubber and
a crosslinking system consisting of at least one crosslinker and optionally at least one vulcanization accelerator, wherein the at least one crosslinker comprises polyethyleneimine and at least one diamine and wherein the total content of the vulcanization accelerators diphenylguanidine (DPG), di-ortho-tolyl-guanidine (DOTG) and 1-(ortho-tolyl)biguanide of the crosslinking system in the mixture is not more than 0.4 phr.
2 . The mixture as claimed in claim 1 , wherein the crosslinking system consists to an extent of ≥80% by weight, based on the total mass of the crosslinking system, of at least one crosslinker, wherein the at least one crosslinker comprises polyethyleneimine.
3 . The mixture as claimed in claim 1 , wherein the at least one crosslinker consists of polyethyleneimine and at least one diamine.
4 . The mixture as claimed in claim 1 , wherein the content of polyethyleneimine is from 0.001 to 20 phr.
5 . The mixture as claimed in claim 1 , wherein the content of the at least one diamine, is from 0.01 to 5 phr.
6 . The mixture as claimed in claim 1 , wherein the at least one aminically crosslinkable rubber is a carboxyl-containing rubber.
7 . The mixture as claimed in claim 1 , wherein the at least one aminically crosslinkable rubber is an ACM rubber, the content of polyethyleneimine is 0.01 to 10 phr, and the content of the at least one diamine is 0.01 to 5 phr.
8 . The mixture as claimed in claim 1 , wherein the mixture comprises at least one support selected from the group consisting of neutral, acidic and basic silica on which the at least one crosslinker is absorbed and/or adsorbed.
9 . A process for producing a mixture as claimed in claim 1 , comprising mixing in a first step the at least one crosslinker and optionally the at least one vulcanization accelerator and adding in a second step the at least one aminically crosslinkable rubber to the mixture obtained after the first step.
10 . A process for producing rubber vulcanizates, comprising vulcanizing the mixture according to claim 1 .
11 . A vulcanizate produced by vulcanizing the mixture according to claim 1 .
12 . A rubber article comprising one or more vulcanizates as claimed in claim 11 .
13 . A vehicle comprising at least one rubber article as claimed in claim 12 .
14 . The mixture as claimed in claim 1 , wherein the at least one aminically crosslinkable rubber is an AEM rubber, the content of polyethyleneimine is 0.01 to 10 phr, and the content of the at least one diamine is 0.01 to 5 phr.
15 . The mixture as claimed in claim 1 , wherein the crosslinking system consists to an extent of ≥95% by weight, based on the total mass of the crosslinking system, of at least one crosslinker, wherein the at least one crosslinker comprises polyethyleneimine.
16 . The mixture as claimed in claim 1 , wherein the at least one diamine is selected from the group consisting of hexamethylenediamine (HMD) and hexamethylenediamine carbamate (HMDC).
17 . The mixture as claimed in claim 1 , wherein the at least one aminically crosslinkable rubber is a carboxyl-containing rubber selected from the group consisting of polyacrylate and ethylene acrylate rubbers.