Sulphurised polybenzoxazine that can be used for coating metal and for the bonding of same to rubber
A technology of polybenzoxazine and benzoxazine, which is applied in coatings, adhesives, polyether coatings, etc., can solve problems such as accelerated degradation process, increased cost, and weakened adhesion
Active Publication Date: 2020-02-07
MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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Problems solved by technology
[0008] However, it is well known that under the influence of the various stresses encountered (especially mechanical and / or thermal stresses), the adhesion between carbon steel and rubber substrates can easily deteriorate with time due to the continuous development of sulphides formed. weakened, the above degradation process may be accelerated in the presence of moisture
Furthermore, the use of cobalt salts makes the rubber composition more sensitive to oxidation and aging, and adds significantly to the cost, not to mention, in the long run, due to recent changes in European regulations regarding this type of metal salt, it is hoped that the rubber composition Eliminate the use of this cobalt salt in the
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[0032] First of all, it should be remembered that benzoxazines are compounds of the general formula:
[0033]
[0034] figure 1 a The general principle of the synthesis of benzoxazines is reviewed, in this case starting with one molecule of phenol, two molecules of formaldehyde and an amine (R denotes the residue of the amine) (condensation reaction), with elimination of two molecules of water.
[0035] figure 1 Part b reviews the mechanism by which the oxazine ring of this compound is opened (ring opening) during heat input (denoted by the symbol Δ).
[0036] Therefore, various benzoxazine compounds or monomers can be synthesized using various phenols and amines depending on the type of substituents. These substituents can then provide polymerizable sites and enable the synthesis of various benzoxazine polymers (or polybenzoxazines).
[0037] The resulting benzoxazines and polybenzoxazines are products known today to those skilled in the art; to cite only a few exampl...
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Abstract
The invention relates to sulphurised polybenzoxazine, the recurring units of which comprise at least one unit corresponding to the formulas (I) or (II): wherein the two oxazine rings are connected toone another by a central aromatic group, the benzene ring of which is a carrier of one, two, three or four groups of formula -Sx-R wherein "x" is an integer between 1 and 8 and R is hydrogen or a hydrocarbon group having 1 to 10 carbon atoms and optionally a heteroatom selected from O, S, N and P. Use of such a polybenzoxazine as a metal-adhesive layer, in particular for bonding a metal substrate,in particular carbon steel, to rubber.
Description
[0001] 1. Technical field [0002] The present invention relates to thermosetting resins which can be used in particular in bonding systems which, inter alia, adhesively bond metal and rubber. [0003] The present invention relates more particularly to polymers having benzoxazine units or "polybenzoxazines" which can be used in particular as metal / rubber for the manufacture of rubber articles for motor vehicles, such as pneumatic or non-pneumatic tyres. Adhesive layer of composite materials. [0004] 2. Background technology [0005] Metal / rubber composites, especially for motor vehicle tires, are well known. It usually consists of a matrix made of sulfur-crosslinkable unsaturated rubber, usually a diene rubber, and includes metallic reinforcing elements (or "reinforcements") such as yarns, films, strips or cords (made of made of carbon steel). [0006] Since they are subjected to very high stresses during the rolling of the tire, in particular repeated compressive actions, ...
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IPC IPC(8): C08G73/06C09J179/00
CPCC08G73/06C09D179/02B60C9/0007B60C2009/0014B60C2009/0021C08F136/14C08G65/40C09D147/00C09D171/00C09J147/00C09J171/00
Inventor M·费杜尔科M·里贝佐
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN